LCOV - code coverage report
Current view: top level - libavcodec - ac3enc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 995 1193 83.4 %
Date: 2017-12-18 06:23:41 Functions: 40 42 95.2 %

          Line data    Source code
       1             : /*
       2             :  * The simplest AC-3 encoder
       3             :  * Copyright (c) 2000 Fabrice Bellard
       4             :  * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
       5             :  * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
       6             :  *
       7             :  * This file is part of FFmpeg.
       8             :  *
       9             :  * FFmpeg is free software; you can redistribute it and/or
      10             :  * modify it under the terms of the GNU Lesser General Public
      11             :  * License as published by the Free Software Foundation; either
      12             :  * version 2.1 of the License, or (at your option) any later version.
      13             :  *
      14             :  * FFmpeg is distributed in the hope that it will be useful,
      15             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      17             :  * Lesser General Public License for more details.
      18             :  *
      19             :  * You should have received a copy of the GNU Lesser General Public
      20             :  * License along with FFmpeg; if not, write to the Free Software
      21             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      22             :  */
      23             : 
      24             : /**
      25             :  * @file
      26             :  * The simplest AC-3 encoder.
      27             :  */
      28             : 
      29             : #include <stdint.h>
      30             : 
      31             : #include "libavutil/attributes.h"
      32             : #include "libavutil/avassert.h"
      33             : #include "libavutil/avstring.h"
      34             : #include "libavutil/channel_layout.h"
      35             : #include "libavutil/crc.h"
      36             : #include "libavutil/internal.h"
      37             : #include "libavutil/opt.h"
      38             : #include "avcodec.h"
      39             : #include "internal.h"
      40             : #include "me_cmp.h"
      41             : #include "put_bits.h"
      42             : #include "audiodsp.h"
      43             : #include "ac3dsp.h"
      44             : #include "ac3.h"
      45             : #include "fft.h"
      46             : #include "ac3enc.h"
      47             : #include "eac3enc.h"
      48             : 
      49             : typedef struct AC3Mant {
      50             :     int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
      51             :     int mant1_cnt, mant2_cnt, mant4_cnt;    ///< mantissa counts for bap=1,2,4
      52             : } AC3Mant;
      53             : 
      54             : #define CMIXLEV_NUM_OPTIONS 3
      55             : static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = {
      56             :     LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
      57             : };
      58             : 
      59             : #define SURMIXLEV_NUM_OPTIONS 3
      60             : static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = {
      61             :     LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
      62             : };
      63             : 
      64             : #define EXTMIXLEV_NUM_OPTIONS 8
      65             : static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = {
      66             :     LEVEL_PLUS_3DB,  LEVEL_PLUS_1POINT5DB,  LEVEL_ONE,       LEVEL_MINUS_4POINT5DB,
      67             :     LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO
      68             : };
      69             : 
      70             : 
      71             : /**
      72             :  * LUT for number of exponent groups.
      73             :  * exponent_group_tab[coupling][exponent strategy-1][number of coefficients]
      74             :  */
      75             : static uint8_t exponent_group_tab[2][3][256];
      76             : 
      77             : 
      78             : /**
      79             :  * List of supported channel layouts.
      80             :  */
      81             : const uint64_t ff_ac3_channel_layouts[19] = {
      82             :      AV_CH_LAYOUT_MONO,
      83             :      AV_CH_LAYOUT_STEREO,
      84             :      AV_CH_LAYOUT_2_1,
      85             :      AV_CH_LAYOUT_SURROUND,
      86             :      AV_CH_LAYOUT_2_2,
      87             :      AV_CH_LAYOUT_QUAD,
      88             :      AV_CH_LAYOUT_4POINT0,
      89             :      AV_CH_LAYOUT_5POINT0,
      90             :      AV_CH_LAYOUT_5POINT0_BACK,
      91             :     (AV_CH_LAYOUT_MONO     | AV_CH_LOW_FREQUENCY),
      92             :     (AV_CH_LAYOUT_STEREO   | AV_CH_LOW_FREQUENCY),
      93             :     (AV_CH_LAYOUT_2_1      | AV_CH_LOW_FREQUENCY),
      94             :     (AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY),
      95             :     (AV_CH_LAYOUT_2_2      | AV_CH_LOW_FREQUENCY),
      96             :     (AV_CH_LAYOUT_QUAD     | AV_CH_LOW_FREQUENCY),
      97             :     (AV_CH_LAYOUT_4POINT0  | AV_CH_LOW_FREQUENCY),
      98             :      AV_CH_LAYOUT_5POINT1,
      99             :      AV_CH_LAYOUT_5POINT1_BACK,
     100             :      0
     101             : };
     102             : 
     103             : 
     104             : /**
     105             :  * LUT to select the bandwidth code based on the bit rate, sample rate, and
     106             :  * number of full-bandwidth channels.
     107             :  * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code]
     108             :  */
     109             : static const uint8_t ac3_bandwidth_tab[5][3][19] = {
     110             : //      32  40  48  56  64  80  96 112 128 160 192 224 256 320 384 448 512 576 640
     111             : 
     112             :     { {  0,  0,  0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
     113             :       {  0,  0,  0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
     114             :       {  0,  0,  0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
     115             : 
     116             :     { {  0,  0,  0,  0,  0,  0,  0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
     117             :       {  0,  0,  0,  0,  0,  0,  4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
     118             :       {  0,  0,  0,  0,  0,  0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
     119             : 
     120             :     { {  0,  0,  0,  0,  0,  0,  0,  0,  0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 },
     121             :       {  0,  0,  0,  0,  0,  0,  0,  0,  4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 },
     122             :       {  0,  0,  0,  0,  0,  0,  0,  0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } },
     123             : 
     124             :     { {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 12, 24, 32, 48, 48, 48, 48, 48, 48 },
     125             :       {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 16, 28, 36, 56, 56, 56, 56, 56, 56 },
     126             :       {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } },
     127             : 
     128             :     { {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  8, 20, 32, 40, 48, 48, 48, 48 },
     129             :       {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 12, 24, 36, 44, 56, 56, 56, 56 },
     130             :       {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 28, 44, 60, 60, 60, 60, 60, 60 } }
     131             : };
     132             : 
     133             : 
     134             : /**
     135             :  * LUT to select the coupling start band based on the bit rate, sample rate, and
     136             :  * number of full-bandwidth channels. -1 = coupling off
     137             :  * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code]
     138             :  *
     139             :  * TODO: more testing for optimal parameters.
     140             :  *       multi-channel tests at 44.1kHz and 32kHz.
     141             :  */
     142             : static const int8_t ac3_coupling_start_tab[6][3][19] = {
     143             : //      32  40  48  56  64  80  96 112 128 160 192 224 256 320 384 448 512 576 640
     144             : 
     145             :     // 2/0
     146             :     { {  0,  0,  0,  0,  0,  0,  0,  1,  1,  7,  8, 11, 12, -1, -1, -1, -1, -1, -1 },
     147             :       {  0,  0,  0,  0,  0,  0,  1,  3,  5,  7, 10, 12, 13, -1, -1, -1, -1, -1, -1 },
     148             :       {  0,  0,  0,  0,  1,  2,  2,  9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
     149             : 
     150             :     // 3/0
     151             :     { {  0,  0,  0,  0,  0,  0,  0,  0,  2,  2,  6,  9, 11, 12, 13, -1, -1, -1, -1 },
     152             :       {  0,  0,  0,  0,  0,  0,  0,  0,  2,  2,  6,  9, 11, 12, 13, -1, -1, -1, -1 },
     153             :       { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
     154             : 
     155             :     // 2/1 - untested
     156             :     { {  0,  0,  0,  0,  0,  0,  0,  0,  2,  2,  6,  9, 11, 12, 13, -1, -1, -1, -1 },
     157             :       {  0,  0,  0,  0,  0,  0,  0,  0,  2,  2,  6,  9, 11, 12, 13, -1, -1, -1, -1 },
     158             :       { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
     159             : 
     160             :     // 3/1
     161             :     { {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  3,  2, 10, 11, 11, 12, 12, 14, -1 },
     162             :       {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  3,  2, 10, 11, 11, 12, 12, 14, -1 },
     163             :       { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
     164             : 
     165             :     // 2/2 - untested
     166             :     { {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  3,  2, 10, 11, 11, 12, 12, 14, -1 },
     167             :       {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  3,  2, 10, 11, 11, 12, 12, 14, -1 },
     168             :       { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
     169             : 
     170             :     // 3/2
     171             :     { {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  6,  8, 11, 12, 12, -1, -1 },
     172             :       {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  6,  8, 11, 12, 12, -1, -1 },
     173             :       { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
     174             : };
     175             : 
     176             : 
     177             : /**
     178             :  * Adjust the frame size to make the average bit rate match the target bit rate.
     179             :  * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3.
     180             :  *
     181             :  * @param s  AC-3 encoder private context
     182             :  */
     183        1097 : void ff_ac3_adjust_frame_size(AC3EncodeContext *s)
     184             : {
     185        2228 :     while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) {
     186          34 :         s->bits_written    -= s->bit_rate;
     187          34 :         s->samples_written -= s->sample_rate;
     188             :     }
     189        2194 :     s->frame_size = s->frame_size_min +
     190        1097 :                     2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate);
     191        1097 :     s->bits_written    += s->frame_size * 8;
     192        1097 :     s->samples_written += AC3_BLOCK_SIZE * s->num_blocks;
     193        1097 : }
     194             : 
     195             : 
     196             : /**
     197             :  * Set the initial coupling strategy parameters prior to coupling analysis.
     198             :  *
     199             :  * @param s  AC-3 encoder private context
     200             :  */
     201        1097 : void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
     202             : {
     203             :     int blk, ch;
     204             :     int got_cpl_snr;
     205             :     int num_cpl_blocks;
     206             : 
     207             :     /* set coupling use flags for each block/channel */
     208             :     /* TODO: turn coupling on/off and adjust start band based on bit usage */
     209        7679 :     for (blk = 0; blk < s->num_blocks; blk++) {
     210        6582 :         AC3Block *block = &s->blocks[blk];
     211       17478 :         for (ch = 1; ch <= s->fbw_channels; ch++)
     212       10896 :             block->channel_in_cpl[ch] = s->cpl_on;
     213             :     }
     214             : 
     215             :     /* enable coupling for each block if at least 2 channels have coupling
     216             :        enabled for that block */
     217        1097 :     got_cpl_snr = 0;
     218        1097 :     num_cpl_blocks = 0;
     219        7679 :     for (blk = 0; blk < s->num_blocks; blk++) {
     220        6582 :         AC3Block *block = &s->blocks[blk];
     221        6582 :         block->num_cpl_channels = 0;
     222       17478 :         for (ch = 1; ch <= s->fbw_channels; ch++)
     223       10896 :             block->num_cpl_channels += block->channel_in_cpl[ch];
     224        6582 :         block->cpl_in_use = block->num_cpl_channels > 1;
     225        6582 :         num_cpl_blocks += block->cpl_in_use;
     226        6582 :         if (!block->cpl_in_use) {
     227        2268 :             block->num_cpl_channels = 0;
     228        4536 :             for (ch = 1; ch <= s->fbw_channels; ch++)
     229        2268 :                 block->channel_in_cpl[ch] = 0;
     230             :         }
     231             : 
     232        6582 :         block->new_cpl_strategy = !blk;
     233        6582 :         if (blk) {
     234       14565 :             for (ch = 1; ch <= s->fbw_channels; ch++) {
     235        9080 :                 if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
     236           0 :                     block->new_cpl_strategy = 1;
     237           0 :                     break;
     238             :                 }
     239             :             }
     240             :         }
     241        6582 :         block->new_cpl_leak = block->new_cpl_strategy;
     242             : 
     243        6582 :         if (!blk || (block->cpl_in_use && !got_cpl_snr)) {
     244        1097 :             block->new_snr_offsets = 1;
     245        2194 :             if (block->cpl_in_use)
     246         719 :                 got_cpl_snr = 1;
     247             :         } else {
     248        5485 :             block->new_snr_offsets = 0;
     249             :         }
     250             :     }
     251        1097 :     if (!num_cpl_blocks)
     252         378 :         s->cpl_on = 0;
     253             : 
     254             :     /* set bandwidth for each channel */
     255        7679 :     for (blk = 0; blk < s->num_blocks; blk++) {
     256        6582 :         AC3Block *block = &s->blocks[blk];
     257       17478 :         for (ch = 1; ch <= s->fbw_channels; ch++) {
     258       10896 :             if (block->channel_in_cpl[ch])
     259        8628 :                 block->end_freq[ch] = s->start_freq[CPL_CH];
     260             :             else
     261        2268 :                 block->end_freq[ch] = s->bandwidth_code * 3 + 73;
     262             :         }
     263             :     }
     264        1097 : }
     265             : 
     266             : 
     267             : /**
     268             :  * Apply stereo rematrixing to coefficients based on rematrixing flags.
     269             :  *
     270             :  * @param s  AC-3 encoder private context
     271             :  */
     272        1097 : void ff_ac3_apply_rematrixing(AC3EncodeContext *s)
     273             : {
     274             :     int nb_coefs;
     275             :     int blk, bnd, i;
     276             :     int start, end;
     277        1097 :     uint8_t *flags = NULL;
     278             : 
     279        1097 :     if (!s->rematrixing_enabled)
     280         378 :         return;
     281             : 
     282        5033 :     for (blk = 0; blk < s->num_blocks; blk++) {
     283        4314 :         AC3Block *block = &s->blocks[blk];
     284        4314 :         if (block->new_rematrixing_strategy)
     285        2214 :             flags = block->rematrixing_flags;
     286        4314 :         nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
     287       21570 :         for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
     288       17256 :             if (flags[bnd]) {
     289        9589 :                 start = ff_ac3_rematrix_band_tab[bnd];
     290        9589 :                 end   = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
     291      226249 :                 for (i = start; i < end; i++) {
     292      216660 :                     int32_t lt = block->fixed_coef[1][i];
     293      216660 :                     int32_t rt = block->fixed_coef[2][i];
     294      216660 :                     block->fixed_coef[1][i] = (lt + rt) >> 1;
     295      216660 :                     block->fixed_coef[2][i] = (lt - rt) >> 1;
     296             :                 }
     297             :             }
     298             :         }
     299             :     }
     300             : }
     301             : 
     302             : 
     303             : /*
     304             :  * Initialize exponent tables.
     305             :  */
     306           6 : static av_cold void exponent_init(AC3EncodeContext *s)
     307             : {
     308             :     int expstr, i, grpsize;
     309             : 
     310          24 :     for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) {
     311          18 :         grpsize = 3 << expstr;
     312        4410 :         for (i = 12; i < 256; i++) {
     313        4392 :             exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize;
     314        4392 :             exponent_group_tab[1][expstr][i] = (i              ) / grpsize;
     315             :         }
     316             :     }
     317             :     /* LFE */
     318           6 :     exponent_group_tab[0][0][7] = 2;
     319             : 
     320           6 :     if (CONFIG_EAC3_ENCODER && s->eac3)
     321           1 :         ff_eac3_exponent_init();
     322           6 : }
     323             : 
     324             : 
     325             : /*
     326             :  * Extract exponents from the MDCT coefficients.
     327             :  */
     328        1097 : static void extract_exponents(AC3EncodeContext *s)
     329             : {
     330        1097 :     int ch        = !s->cpl_on;
     331        1097 :     int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1);
     332        1097 :     AC3Block *block = &s->blocks[0];
     333             : 
     334        1097 :     s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size);
     335        1097 : }
     336             : 
     337             : 
     338             : /**
     339             :  * Exponent Difference Threshold.
     340             :  * New exponents are sent if their SAD exceed this number.
     341             :  */
     342             : #define EXP_DIFF_THRESHOLD 500
     343             : 
     344             : /**
     345             :  * Table used to select exponent strategy based on exponent reuse block interval.
     346             :  */
     347             : static const uint8_t exp_strategy_reuse_tab[4][6] = {
     348             :     { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
     349             :     { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
     350             :     { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
     351             :     { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 }
     352             : };
     353             : 
     354             : /*
     355             :  * Calculate exponent strategies for all channels.
     356             :  * Array arrangement is reversed to simplify the per-channel calculation.
     357             :  */
     358        1097 : static void compute_exp_strategy(AC3EncodeContext *s)
     359             : {
     360             :     int ch, blk, blk1;
     361             : 
     362        3632 :     for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
     363        2535 :         uint8_t *exp_strategy = s->exp_strategy[ch];
     364        2535 :         uint8_t *exp          = s->blocks[0].exp[ch];
     365             :         int exp_diff;
     366             : 
     367             :         /* estimate if the exponent variation & decide if they should be
     368             :            reused in the next frame */
     369        2535 :         exp_strategy[0] = EXP_NEW;
     370        2535 :         exp += AC3_MAX_COEFS;
     371       15210 :         for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) {
     372       12675 :             if (ch == CPL_CH) {
     373        3595 :                 if (!s->blocks[blk-1].cpl_in_use) {
     374           0 :                     exp_strategy[blk] = EXP_NEW;
     375           0 :                     continue;
     376        3595 :                 } else if (!s->blocks[blk].cpl_in_use) {
     377           0 :                     exp_strategy[blk] = EXP_REUSE;
     378           0 :                     continue;
     379             :                 }
     380        9080 :             } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
     381           0 :                 exp_strategy[blk] = EXP_NEW;
     382           0 :                 continue;
     383             :             }
     384       12675 :             exp_diff = s->mecc.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16);
     385       12675 :             exp_strategy[blk] = EXP_REUSE;
     386       12675 :             if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS))
     387        1363 :                 exp_strategy[blk] = EXP_NEW;
     388       11312 :             else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD)
     389        2488 :                 exp_strategy[blk] = EXP_NEW;
     390             :         }
     391             : 
     392             :         /* now select the encoding strategy type : if exponents are often
     393             :            recoded, we use a coarse encoding */
     394        2535 :         blk = 0;
     395       11456 :         while (blk < s->num_blocks) {
     396        6386 :             blk1 = blk + 1;
     397       21596 :             while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE)
     398        8824 :                 blk1++;
     399        6386 :             exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1];
     400        6386 :             blk = blk1;
     401             :         }
     402             :     }
     403        1097 :     if (s->lfe_on) {
     404           0 :         ch = s->lfe_channel;
     405           0 :         s->exp_strategy[ch][0] = EXP_D15;
     406           0 :         for (blk = 1; blk < s->num_blocks; blk++)
     407           0 :             s->exp_strategy[ch][blk] = EXP_REUSE;
     408             :     }
     409             : 
     410             :     /* for E-AC-3, determine frame exponent strategy */
     411        1097 :     if (CONFIG_EAC3_ENCODER && s->eac3)
     412         273 :         ff_eac3_get_frame_exp_strategy(s);
     413        1097 : }
     414             : 
     415             : 
     416             : /**
     417             :  * Update the exponents so that they are the ones the decoder will decode.
     418             :  *
     419             :  * @param[in,out] exp   array of exponents for 1 block in 1 channel
     420             :  * @param nb_exps       number of exponents in active bandwidth
     421             :  * @param exp_strategy  exponent strategy for the block
     422             :  * @param cpl           indicates if the block is in the coupling channel
     423             :  */
     424        6386 : static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
     425             :                                     int cpl)
     426             : {
     427             :     int nb_groups, i, k;
     428             : 
     429        6386 :     nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3;
     430             : 
     431             :     /* for each group, compute the minimum exponent */
     432        6386 :     switch(exp_strategy) {
     433         731 :     case EXP_D25:
     434       36791 :         for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
     435       36060 :             uint8_t exp_min = exp[k];
     436       36060 :             if (exp[k+1] < exp_min)
     437       12598 :                 exp_min = exp[k+1];
     438       36060 :             exp[i-cpl] = exp_min;
     439       36060 :             k += 2;
     440             :         }
     441         731 :         break;
     442        3991 :     case EXP_D45:
     443      143218 :         for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
     444      139227 :             uint8_t exp_min = exp[k];
     445      139227 :             if (exp[k+1] < exp_min)
     446       49876 :                 exp_min = exp[k+1];
     447      139227 :             if (exp[k+2] < exp_min)
     448       23643 :                 exp_min = exp[k+2];
     449      139227 :             if (exp[k+3] < exp_min)
     450       16576 :                 exp_min = exp[k+3];
     451      139227 :             exp[i-cpl] = exp_min;
     452      139227 :             k += 4;
     453             :         }
     454        3991 :         break;
     455             :     }
     456             : 
     457             :     /* constraint for DC exponent */
     458        6386 :     if (!cpl && exp[0] > 15)
     459          78 :         exp[0] = 15;
     460             : 
     461             :     /* decrease the delta between each groups to within 2 so that they can be
     462             :        differentially encoded */
     463      336089 :     for (i = 1; i <= nb_groups; i++)
     464      329703 :         exp[i] = FFMIN(exp[i], exp[i-1] + 2);
     465        6386 :     i--;
     466      342475 :     while (--i >= 0)
     467      329703 :         exp[i] = FFMIN(exp[i], exp[i+1] + 2);
     468             : 
     469        6386 :     if (cpl)
     470        2082 :         exp[-1] = exp[0] & ~1;
     471             : 
     472             :     /* now we have the exponent values the decoder will see */
     473        6386 :     switch (exp_strategy) {
     474         731 :     case EXP_D25:
     475       36791 :         for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) {
     476       36060 :             uint8_t exp1 = exp[i-cpl];
     477       36060 :             exp[k--] = exp1;
     478       36060 :             exp[k--] = exp1;
     479             :         }
     480         731 :         break;
     481        3991 :     case EXP_D45:
     482      143218 :         for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) {
     483      139227 :             exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl];
     484      139227 :             k -= 4;
     485             :         }
     486        3991 :         break;
     487             :     }
     488        6386 : }
     489             : 
     490             : 
     491             : /*
     492             :  * Encode exponents from original extracted form to what the decoder will see.
     493             :  * This copies and groups exponents based on exponent strategy and reduces
     494             :  * deltas between adjacent exponent groups so that they can be differentially
     495             :  * encoded.
     496             :  */
     497        1097 : static void encode_exponents(AC3EncodeContext *s)
     498             : {
     499             :     int blk, blk1, ch, cpl;
     500             :     uint8_t *exp, *exp_strategy;
     501             :     int nb_coefs, num_reuse_blocks;
     502             : 
     503        3632 :     for (ch = !s->cpl_on; ch <= s->channels; ch++) {
     504        2535 :         exp          = s->blocks[0].exp[ch] + s->start_freq[ch];
     505        2535 :         exp_strategy = s->exp_strategy[ch];
     506             : 
     507        2535 :         cpl = (ch == CPL_CH);
     508        2535 :         blk = 0;
     509       11456 :         while (blk < s->num_blocks) {
     510        6386 :             AC3Block *block = &s->blocks[blk];
     511        6386 :             if (cpl && !block->cpl_in_use) {
     512           0 :                 exp += AC3_MAX_COEFS;
     513           0 :                 blk++;
     514           0 :                 continue;
     515             :             }
     516        6386 :             nb_coefs = block->end_freq[ch] - s->start_freq[ch];
     517        6386 :             blk1 = blk + 1;
     518             : 
     519             :             /* count the number of EXP_REUSE blocks after the current block
     520             :                and set exponent reference block numbers */
     521        6386 :             s->exp_ref_block[ch][blk] = blk;
     522       21596 :             while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) {
     523        8824 :                 s->exp_ref_block[ch][blk1] = blk;
     524        8824 :                 blk1++;
     525             :             }
     526        6386 :             num_reuse_blocks = blk1 - blk - 1;
     527             : 
     528             :             /* for the EXP_REUSE case we select the min of the exponents */
     529        6386 :             s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks,
     530             :                                        AC3_MAX_COEFS);
     531             : 
     532        6386 :             encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl);
     533             : 
     534        6386 :             exp += AC3_MAX_COEFS * (num_reuse_blocks + 1);
     535        6386 :             blk = blk1;
     536             :         }
     537             :     }
     538             : 
     539             :     /* reference block numbers have been changed, so reset ref_bap_set */
     540        1097 :     s->ref_bap_set = 0;
     541        1097 : }
     542             : 
     543             : 
     544             : /*
     545             :  * Count exponent bits based on bandwidth, coupling, and exponent strategies.
     546             :  */
     547        1097 : static int count_exponent_bits(AC3EncodeContext *s)
     548             : {
     549             :     int blk, ch;
     550             :     int nb_groups, bit_count;
     551             : 
     552        1097 :     bit_count = 0;
     553        7679 :     for (blk = 0; blk < s->num_blocks; blk++) {
     554        6582 :         AC3Block *block = &s->blocks[blk];
     555       21792 :         for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
     556       15210 :             int exp_strategy = s->exp_strategy[ch][blk];
     557       15210 :             int cpl          = (ch == CPL_CH);
     558       15210 :             int nb_coefs     = block->end_freq[ch] - s->start_freq[ch];
     559             : 
     560       15210 :             if (exp_strategy == EXP_REUSE)
     561        8824 :                 continue;
     562             : 
     563        6386 :             nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs];
     564        6386 :             bit_count += 4 + (nb_groups * 7);
     565             :         }
     566             :     }
     567             : 
     568        1097 :     return bit_count;
     569             : }
     570             : 
     571             : 
     572             : /**
     573             :  * Group exponents.
     574             :  * 3 delta-encoded exponents are in each 7-bit group. The number of groups
     575             :  * varies depending on exponent strategy and bandwidth.
     576             :  *
     577             :  * @param s  AC-3 encoder private context
     578             :  */
     579        1097 : void ff_ac3_group_exponents(AC3EncodeContext *s)
     580             : {
     581             :     int blk, ch, i, cpl;
     582             :     int group_size, nb_groups;
     583             :     uint8_t *p;
     584             :     int delta0, delta1, delta2;
     585             :     int exp0, exp1;
     586             : 
     587        7679 :     for (blk = 0; blk < s->num_blocks; blk++) {
     588        6582 :         AC3Block *block = &s->blocks[blk];
     589       21792 :         for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
     590       15210 :             int exp_strategy = s->exp_strategy[ch][blk];
     591       15210 :             if (exp_strategy == EXP_REUSE)
     592        8824 :                 continue;
     593        6386 :             cpl = (ch == CPL_CH);
     594        6386 :             group_size = exp_strategy + (exp_strategy == EXP_D45);
     595        6386 :             nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]];
     596        6386 :             p = block->exp[ch] + s->start_freq[ch] - cpl;
     597             : 
     598             :             /* DC exponent */
     599        6386 :             exp1 = *p++;
     600        6386 :             block->grouped_exp[ch][0] = exp1;
     601             : 
     602             :             /* remaining exponents are delta encoded */
     603      116287 :             for (i = 1; i <= nb_groups; i++) {
     604             :                 /* merge three delta in one code */
     605      109901 :                 exp0   = exp1;
     606      109901 :                 exp1   = p[0];
     607      109901 :                 p     += group_size;
     608      109901 :                 delta0 = exp1 - exp0 + 2;
     609             :                 av_assert2(delta0 >= 0 && delta0 <= 4);
     610             : 
     611      109901 :                 exp0   = exp1;
     612      109901 :                 exp1   = p[0];
     613      109901 :                 p     += group_size;
     614      109901 :                 delta1 = exp1 - exp0 + 2;
     615             :                 av_assert2(delta1 >= 0 && delta1 <= 4);
     616             : 
     617      109901 :                 exp0   = exp1;
     618      109901 :                 exp1   = p[0];
     619      109901 :                 p     += group_size;
     620      109901 :                 delta2 = exp1 - exp0 + 2;
     621             :                 av_assert2(delta2 >= 0 && delta2 <= 4);
     622             : 
     623      109901 :                 block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
     624             :             }
     625             :         }
     626             :     }
     627        1097 : }
     628             : 
     629             : 
     630             : /**
     631             :  * Calculate final exponents from the supplied MDCT coefficients and exponent shift.
     632             :  * Extract exponents from MDCT coefficients, calculate exponent strategies,
     633             :  * and encode final exponents.
     634             :  *
     635             :  * @param s  AC-3 encoder private context
     636             :  */
     637        1097 : void ff_ac3_process_exponents(AC3EncodeContext *s)
     638             : {
     639        1097 :     extract_exponents(s);
     640             : 
     641        1097 :     compute_exp_strategy(s);
     642             : 
     643        1097 :     encode_exponents(s);
     644             : 
     645        1097 :     emms_c();
     646        1097 : }
     647             : 
     648             : 
     649             : /*
     650             :  * Count frame bits that are based solely on fixed parameters.
     651             :  * This only has to be run once when the encoder is initialized.
     652             :  */
     653           6 : static void count_frame_bits_fixed(AC3EncodeContext *s)
     654             : {
     655             :     static const int frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 };
     656             :     int blk;
     657             :     int frame_bits;
     658             : 
     659             :     /* assumptions:
     660             :      *   no dynamic range codes
     661             :      *   bit allocation parameters do not change between blocks
     662             :      *   no delta bit allocation
     663             :      *   no skipped data
     664             :      *   no auxiliary data
     665             :      *   no E-AC-3 metadata
     666             :      */
     667             : 
     668             :     /* header */
     669           6 :     frame_bits = 16; /* sync info */
     670           6 :     if (s->eac3) {
     671             :         /* bitstream info header */
     672           1 :         frame_bits += 35;
     673           1 :         frame_bits += 1 + 1;
     674           1 :         if (s->num_blocks != 0x6)
     675           0 :             frame_bits++;
     676           1 :         frame_bits++;
     677             :         /* audio frame header */
     678           1 :         if (s->num_blocks == 6)
     679           1 :             frame_bits += 2;
     680           1 :         frame_bits += 10;
     681             :         /* exponent strategy */
     682           1 :         if (s->use_frame_exp_strategy)
     683           0 :             frame_bits += 5 * s->fbw_channels;
     684             :         else
     685           1 :             frame_bits += s->num_blocks * 2 * s->fbw_channels;
     686           1 :         if (s->lfe_on)
     687           0 :             frame_bits += s->num_blocks;
     688             :         /* converter exponent strategy */
     689           1 :         if (s->num_blks_code != 0x3)
     690           0 :             frame_bits++;
     691             :         else
     692           1 :             frame_bits += s->fbw_channels * 5;
     693             :         /* snr offsets */
     694           1 :         frame_bits += 10;
     695             :         /* block start info */
     696           1 :         if (s->num_blocks != 1)
     697           1 :             frame_bits++;
     698             :     } else {
     699           5 :         frame_bits += 49;
     700           5 :         frame_bits += frame_bits_inc[s->channel_mode];
     701             :     }
     702             : 
     703             :     /* audio blocks */
     704          42 :     for (blk = 0; blk < s->num_blocks; blk++) {
     705          36 :         if (!s->eac3) {
     706             :             /* block switch flags */
     707          30 :             frame_bits += s->fbw_channels;
     708             : 
     709             :             /* dither flags */
     710          30 :             frame_bits += s->fbw_channels;
     711             :         }
     712             : 
     713             :         /* dynamic range */
     714          36 :         frame_bits++;
     715             : 
     716             :         /* spectral extension */
     717          36 :         if (s->eac3)
     718           6 :             frame_bits++;
     719             : 
     720          36 :         if (!s->eac3) {
     721             :             /* exponent strategy */
     722          30 :             frame_bits += 2 * s->fbw_channels;
     723          30 :             if (s->lfe_on)
     724           0 :                 frame_bits++;
     725             : 
     726             :             /* bit allocation params */
     727          30 :             frame_bits++;
     728          30 :             if (!blk)
     729           5 :                 frame_bits += 2 + 2 + 2 + 2 + 3;
     730             :         }
     731             : 
     732             :         /* converter snr offset */
     733          36 :         if (s->eac3)
     734           6 :             frame_bits++;
     735             : 
     736          36 :         if (!s->eac3) {
     737             :             /* delta bit allocation */
     738          30 :             frame_bits++;
     739             : 
     740             :             /* skipped data */
     741          30 :             frame_bits++;
     742             :         }
     743             :     }
     744             : 
     745             :     /* auxiliary data */
     746           6 :     frame_bits++;
     747             : 
     748             :     /* CRC */
     749           6 :     frame_bits += 1 + 16;
     750             : 
     751           6 :     s->frame_bits_fixed = frame_bits;
     752           6 : }
     753             : 
     754             : 
     755             : /*
     756             :  * Initialize bit allocation.
     757             :  * Set default parameter codes and calculate parameter values.
     758             :  */
     759           6 : static av_cold void bit_alloc_init(AC3EncodeContext *s)
     760             : {
     761             :     int ch;
     762             : 
     763             :     /* init default parameters */
     764           6 :     s->slow_decay_code = 2;
     765           6 :     s->fast_decay_code = 1;
     766           6 :     s->slow_gain_code  = 1;
     767           6 :     s->db_per_bit_code = s->eac3 ? 2 : 3;
     768           6 :     s->floor_code      = 7;
     769          21 :     for (ch = 0; ch <= s->channels; ch++)
     770          15 :         s->fast_gain_code[ch] = 4;
     771             : 
     772             :     /* initial snr offset */
     773           6 :     s->coarse_snr_offset = 40;
     774             : 
     775             :     /* compute real values */
     776             :     /* currently none of these values change during encoding, so we can just
     777             :        set them once at initialization */
     778           6 :     s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code] >> s->bit_alloc.sr_shift;
     779           6 :     s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code] >> s->bit_alloc.sr_shift;
     780           6 :     s->bit_alloc.slow_gain  = ff_ac3_slow_gain_tab[s->slow_gain_code];
     781           6 :     s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code];
     782           6 :     s->bit_alloc.floor      = ff_ac3_floor_tab[s->floor_code];
     783           6 :     s->bit_alloc.cpl_fast_leak = 0;
     784           6 :     s->bit_alloc.cpl_slow_leak = 0;
     785             : 
     786           6 :     count_frame_bits_fixed(s);
     787           6 : }
     788             : 
     789             : 
     790             : /*
     791             :  * Count the bits used to encode the frame, minus exponents and mantissas.
     792             :  * Bits based on fixed parameters have already been counted, so now we just
     793             :  * have to add the bits based on parameters that change during encoding.
     794             :  */
     795        1097 : static void count_frame_bits(AC3EncodeContext *s)
     796             : {
     797        1097 :     AC3EncOptions *opt = &s->options;
     798             :     int blk, ch;
     799        1097 :     int frame_bits = 0;
     800             : 
     801             :     /* header */
     802        1097 :     if (s->eac3) {
     803         273 :         if (opt->eac3_mixing_metadata) {
     804           0 :             if (s->channel_mode > AC3_CHMODE_STEREO)
     805           0 :                 frame_bits += 2;
     806           0 :             if (s->has_center)
     807           0 :                 frame_bits += 6;
     808           0 :             if (s->has_surround)
     809           0 :                 frame_bits += 6;
     810           0 :             frame_bits += s->lfe_on;
     811           0 :             frame_bits += 1 + 1 + 2;
     812           0 :             if (s->channel_mode < AC3_CHMODE_STEREO)
     813           0 :                 frame_bits++;
     814           0 :             frame_bits++;
     815             :         }
     816         273 :         if (opt->eac3_info_metadata) {
     817           0 :             frame_bits += 3 + 1 + 1;
     818           0 :             if (s->channel_mode == AC3_CHMODE_STEREO)
     819           0 :                 frame_bits += 2 + 2;
     820           0 :             if (s->channel_mode >= AC3_CHMODE_2F2R)
     821           0 :                 frame_bits += 2;
     822           0 :             frame_bits++;
     823           0 :             if (opt->audio_production_info)
     824           0 :                 frame_bits += 5 + 2 + 1;
     825           0 :             frame_bits++;
     826             :         }
     827             :         /* coupling */
     828         273 :         if (s->channel_mode > AC3_CHMODE_MONO) {
     829         273 :             frame_bits++;
     830        1638 :             for (blk = 1; blk < s->num_blocks; blk++) {
     831        1365 :                 AC3Block *block = &s->blocks[blk];
     832        1365 :                 frame_bits++;
     833        1365 :                 if (block->new_cpl_strategy)
     834           0 :                     frame_bits++;
     835             :             }
     836             :         }
     837             :         /* coupling exponent strategy */
     838         273 :         if (s->cpl_on) {
     839         273 :             if (s->use_frame_exp_strategy) {
     840         273 :                 frame_bits += 5 * s->cpl_on;
     841             :             } else {
     842           0 :                 for (blk = 0; blk < s->num_blocks; blk++)
     843           0 :                     frame_bits += 2 * s->blocks[blk].cpl_in_use;
     844             :             }
     845             :         }
     846             :     } else {
     847         824 :         if (opt->audio_production_info)
     848           0 :             frame_bits += 7;
     849         824 :         if (s->bitstream_id == 6) {
     850           0 :             if (opt->extended_bsi_1)
     851           0 :                 frame_bits += 14;
     852           0 :             if (opt->extended_bsi_2)
     853           0 :                 frame_bits += 14;
     854             :         }
     855             :     }
     856             : 
     857             :     /* audio blocks */
     858        7679 :     for (blk = 0; blk < s->num_blocks; blk++) {
     859        6582 :         AC3Block *block = &s->blocks[blk];
     860             : 
     861             :         /* coupling strategy */
     862        6582 :         if (!s->eac3)
     863        4944 :             frame_bits++;
     864        6582 :         if (block->new_cpl_strategy) {
     865        1097 :             if (!s->eac3)
     866         824 :                 frame_bits++;
     867        1097 :             if (block->cpl_in_use) {
     868         719 :                 if (s->eac3)
     869         273 :                     frame_bits++;
     870         719 :                 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO)
     871         446 :                     frame_bits += s->fbw_channels;
     872         719 :                 if (s->channel_mode == AC3_CHMODE_STEREO)
     873         719 :                     frame_bits++;
     874         719 :                 frame_bits += 4 + 4;
     875         719 :                 if (s->eac3)
     876         273 :                     frame_bits++;
     877             :                 else
     878         446 :                     frame_bits += s->num_cpl_subbands - 1;
     879             :             }
     880             :         }
     881             : 
     882             :         /* coupling coordinates */
     883        6582 :         if (block->cpl_in_use) {
     884       12942 :             for (ch = 1; ch <= s->fbw_channels; ch++) {
     885        8628 :                 if (block->channel_in_cpl[ch]) {
     886        8628 :                     if (!s->eac3 || block->new_cpl_coords[ch] != 2)
     887        8082 :                         frame_bits++;
     888        8628 :                     if (block->new_cpl_coords[ch]) {
     889        1470 :                         frame_bits += 2;
     890        1470 :                         frame_bits += (4 + 4) * s->num_cpl_bands;
     891             :                     }
     892             :                 }
     893             :             }
     894             :         }
     895             : 
     896             :         /* stereo rematrixing */
     897        6582 :         if (s->channel_mode == AC3_CHMODE_STEREO) {
     898        4314 :             if (!s->eac3 || blk > 0)
     899        4041 :                 frame_bits++;
     900        4314 :             if (s->blocks[blk].new_rematrixing_strategy)
     901        2214 :                 frame_bits += block->num_rematrixing_bands;
     902             :         }
     903             : 
     904             :         /* bandwidth codes & gain range */
     905       17478 :         for (ch = 1; ch <= s->fbw_channels; ch++) {
     906       10896 :             if (s->exp_strategy[ch][blk] != EXP_REUSE) {
     907        4304 :                 if (!block->channel_in_cpl[ch])
     908        1826 :                     frame_bits += 6;
     909        4304 :                 frame_bits += 2;
     910             :             }
     911             :         }
     912             : 
     913             :         /* coupling exponent strategy */
     914        6582 :         if (!s->eac3 && block->cpl_in_use)
     915        2676 :             frame_bits += 2;
     916             : 
     917             :         /* snr offsets and fast gain codes */
     918        6582 :         if (!s->eac3) {
     919        4944 :             frame_bits++;
     920        4944 :             if (block->new_snr_offsets)
     921         824 :                 frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3);
     922             :         }
     923             : 
     924             :         /* coupling leak info */
     925        6582 :         if (block->cpl_in_use) {
     926        4314 :             if (!s->eac3 || block->new_cpl_leak != 2)
     927        4041 :                 frame_bits++;
     928        4314 :             if (block->new_cpl_leak)
     929         719 :                 frame_bits += 3 + 3;
     930             :         }
     931             :     }
     932             : 
     933        1097 :     s->frame_bits = s->frame_bits_fixed + frame_bits;
     934        1097 : }
     935             : 
     936             : 
     937             : /*
     938             :  * Calculate masking curve based on the final exponents.
     939             :  * Also calculate the power spectral densities to use in future calculations.
     940             :  */
     941        1097 : static void bit_alloc_masking(AC3EncodeContext *s)
     942             : {
     943             :     int blk, ch;
     944             : 
     945        7679 :     for (blk = 0; blk < s->num_blocks; blk++) {
     946        6582 :         AC3Block *block = &s->blocks[blk];
     947       21792 :         for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
     948             :             /* We only need psd and mask for calculating bap.
     949             :                Since we currently do not calculate bap when exponent
     950             :                strategy is EXP_REUSE we do not need to calculate psd or mask. */
     951       15210 :             if (s->exp_strategy[ch][blk] != EXP_REUSE) {
     952       12772 :                 ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch],
     953        6386 :                                           block->end_freq[ch], block->psd[ch],
     954        6386 :                                           block->band_psd[ch]);
     955       19158 :                 ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch],
     956             :                                            s->start_freq[ch], block->end_freq[ch],
     957        6386 :                                            ff_ac3_fast_gain_tab[s->fast_gain_code[ch]],
     958        6386 :                                            ch == s->lfe_channel,
     959             :                                            DBA_NONE, 0, NULL, NULL, NULL,
     960        6386 :                                            block->mask[ch]);
     961             :             }
     962             :         }
     963             :     }
     964        1097 : }
     965             : 
     966             : 
     967             : /*
     968             :  * Ensure that bap for each block and channel point to the current bap_buffer.
     969             :  * They may have been switched during the bit allocation search.
     970             :  */
     971       10437 : static void reset_block_bap(AC3EncodeContext *s)
     972             : {
     973             :     int blk, ch;
     974             :     uint8_t *ref_bap;
     975             : 
     976       10437 :     if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set)
     977        3538 :         return;
     978             : 
     979        6899 :     ref_bap = s->bap_buffer;
     980       25096 :     for (ch = 0; ch <= s->channels; ch++) {
     981      127379 :         for (blk = 0; blk < s->num_blocks; blk++)
     982      109182 :             s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk];
     983       18197 :         ref_bap += AC3_MAX_COEFS * s->num_blocks;
     984             :     }
     985        6899 :     s->ref_bap_set = 1;
     986             : }
     987             : 
     988             : 
     989             : /**
     990             :  * Initialize mantissa counts.
     991             :  * These are set so that they are padded to the next whole group size when bits
     992             :  * are counted in compute_mantissa_size.
     993             :  *
     994             :  * @param[in,out] mant_cnt  running counts for each bap value for each block
     995             :  */
     996        9340 : static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
     997             : {
     998             :     int blk;
     999             : 
    1000       65380 :     for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
    1001       56040 :         memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk]));
    1002       56040 :         mant_cnt[blk][1] = mant_cnt[blk][2] = 2;
    1003       56040 :         mant_cnt[blk][4] = 1;
    1004             :     }
    1005        9340 : }
    1006             : 
    1007             : 
    1008             : /**
    1009             :  * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth
    1010             :  * range.
    1011             :  *
    1012             :  * @param s                 AC-3 encoder private context
    1013             :  * @param ch                channel index
    1014             :  * @param[in,out] mant_cnt  running counts for each bap value for each block
    1015             :  * @param start             starting coefficient bin
    1016             :  * @param end               ending coefficient bin
    1017             :  */
    1018       21280 : static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
    1019             :                                           uint16_t mant_cnt[AC3_MAX_BLOCKS][16],
    1020             :                                           int start, int end)
    1021             : {
    1022             :     int blk;
    1023             : 
    1024      148960 :     for (blk = 0; blk < s->num_blocks; blk++) {
    1025      127680 :         AC3Block *block = &s->blocks[blk];
    1026      127680 :         if (ch == CPL_CH && !block->cpl_in_use)
    1027           0 :             continue;
    1028      383040 :         s->ac3dsp.update_bap_counts(mant_cnt[blk],
    1029      127680 :                                     s->ref_bap[ch][blk] + start,
    1030      127680 :                                     FFMIN(end, block->end_freq[ch]) - start);
    1031             :     }
    1032       21280 : }
    1033             : 
    1034             : 
    1035             : /*
    1036             :  * Count the number of mantissa bits in the frame based on the bap values.
    1037             :  */
    1038        9340 : static int count_mantissa_bits(AC3EncodeContext *s)
    1039             : {
    1040             :     int ch, max_end_freq;
    1041        9340 :     LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]);
    1042             : 
    1043        9340 :     count_mantissa_bits_init(mant_cnt);
    1044             : 
    1045        9340 :     max_end_freq = s->bandwidth_code * 3 + 73;
    1046       30620 :     for (ch = !s->cpl_enabled; ch <= s->channels; ch++)
    1047       21280 :         count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch],
    1048             :                                       max_end_freq);
    1049             : 
    1050        9340 :     return s->ac3dsp.compute_mantissa_size(mant_cnt);
    1051             : }
    1052             : 
    1053             : 
    1054             : /**
    1055             :  * Run the bit allocation with a given SNR offset.
    1056             :  * This calculates the bit allocation pointers that will be used to determine
    1057             :  * the quantization of each mantissa.
    1058             :  *
    1059             :  * @param s           AC-3 encoder private context
    1060             :  * @param snr_offset  SNR offset, 0 to 1023
    1061             :  * @return the number of bits needed for mantissas if the given SNR offset is
    1062             :  *         is used.
    1063             :  */
    1064        9340 : static int bit_alloc(AC3EncodeContext *s, int snr_offset)
    1065             : {
    1066             :     int blk, ch;
    1067             : 
    1068        9340 :     snr_offset = (snr_offset - 240) << 2;
    1069             : 
    1070        9340 :     reset_block_bap(s);
    1071       65380 :     for (blk = 0; blk < s->num_blocks; blk++) {
    1072       56040 :         AC3Block *block = &s->blocks[blk];
    1073             : 
    1074      183720 :         for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
    1075             :             /* Currently the only bit allocation parameters which vary across
    1076             :                blocks within a frame are the exponent values.  We can take
    1077             :                advantage of that by reusing the bit allocation pointers
    1078             :                whenever we reuse exponents. */
    1079      127680 :             if (s->exp_strategy[ch][blk] != EXP_REUSE) {
    1080       54306 :                 s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch],
    1081             :                                              s->start_freq[ch], block->end_freq[ch],
    1082             :                                              snr_offset, s->bit_alloc.floor,
    1083             :                                              ff_ac3_bap_tab, s->ref_bap[ch][blk]);
    1084             :             }
    1085             :         }
    1086             :     }
    1087        9340 :     return count_mantissa_bits(s);
    1088             : }
    1089             : 
    1090             : 
    1091             : /*
    1092             :  * Constant bitrate bit allocation search.
    1093             :  * Find the largest SNR offset that will allow data to fit in the frame.
    1094             :  */
    1095        1097 : static int cbr_bit_allocation(AC3EncodeContext *s)
    1096             : {
    1097             :     int ch;
    1098             :     int bits_left;
    1099             :     int snr_offset, snr_incr;
    1100             : 
    1101        1097 :     bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits);
    1102        1097 :     if (bits_left < 0)
    1103           0 :         return AVERROR(EINVAL);
    1104             : 
    1105        1097 :     snr_offset = s->coarse_snr_offset << 4;
    1106             : 
    1107             :     /* if previous frame SNR offset was 1023, check if current frame can also
    1108             :        use SNR offset of 1023. if so, skip the search. */
    1109        1097 :     if ((snr_offset | s->fine_snr_offset[1]) == 1023) {
    1110           0 :         if (bit_alloc(s, 1023) <= bits_left)
    1111           0 :             return 0;
    1112             :     }
    1113             : 
    1114        3785 :     while (snr_offset >= 0 &&
    1115        1344 :            bit_alloc(s, snr_offset) > bits_left) {
    1116         247 :         snr_offset -= 64;
    1117             :     }
    1118        1097 :     if (snr_offset < 0)
    1119           0 :         return AVERROR(EINVAL);
    1120             : 
    1121        1097 :     FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
    1122        5485 :     for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) {
    1123       20380 :         while (snr_offset + snr_incr <= 1023 &&
    1124        7996 :                bit_alloc(s, snr_offset + snr_incr) <= bits_left) {
    1125        3608 :             snr_offset += snr_incr;
    1126        3608 :             FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
    1127             :         }
    1128             :     }
    1129        1097 :     FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
    1130        1097 :     reset_block_bap(s);
    1131             : 
    1132        1097 :     s->coarse_snr_offset = snr_offset >> 4;
    1133        3632 :     for (ch = !s->cpl_on; ch <= s->channels; ch++)
    1134        2535 :         s->fine_snr_offset[ch] = snr_offset & 0xF;
    1135             : 
    1136        1097 :     return 0;
    1137             : }
    1138             : 
    1139             : 
    1140             : /*
    1141             :  * Perform bit allocation search.
    1142             :  * Finds the SNR offset value that maximizes quality and fits in the specified
    1143             :  * frame size.  Output is the SNR offset and a set of bit allocation pointers
    1144             :  * used to quantize the mantissas.
    1145             :  */
    1146        1097 : int ff_ac3_compute_bit_allocation(AC3EncodeContext *s)
    1147             : {
    1148        1097 :     count_frame_bits(s);
    1149             : 
    1150        1097 :     s->exponent_bits = count_exponent_bits(s);
    1151             : 
    1152        1097 :     bit_alloc_masking(s);
    1153             : 
    1154        1097 :     return cbr_bit_allocation(s);
    1155             : }
    1156             : 
    1157             : 
    1158             : /**
    1159             :  * Symmetric quantization on 'levels' levels.
    1160             :  *
    1161             :  * @param c       unquantized coefficient
    1162             :  * @param e       exponent
    1163             :  * @param levels  number of quantization levels
    1164             :  * @return        quantized coefficient
    1165             :  */
    1166      990113 : static inline int sym_quant(int c, int e, int levels)
    1167             : {
    1168      990113 :     int v = (((levels * c) >> (24 - e)) + levels) >> 1;
    1169             :     av_assert2(v >= 0 && v < levels);
    1170      990113 :     return v;
    1171             : }
    1172             : 
    1173             : 
    1174             : /**
    1175             :  * Asymmetric quantization on 2^qbits levels.
    1176             :  *
    1177             :  * @param c      unquantized coefficient
    1178             :  * @param e      exponent
    1179             :  * @param qbits  number of quantization bits
    1180             :  * @return       quantized coefficient
    1181             :  */
    1182      131749 : static inline int asym_quant(int c, int e, int qbits)
    1183             : {
    1184             :     int m;
    1185             : 
    1186      131749 :     c = (((c * (1<<e)) >> (24 - qbits)) + 1) >> 1;
    1187      131749 :     m = (1 << (qbits-1));
    1188      131749 :     if (c >= m)
    1189         147 :         c = m - 1;
    1190             :     av_assert2(c >= -m);
    1191      131749 :     return c;
    1192             : }
    1193             : 
    1194             : 
    1195             : /**
    1196             :  * Quantize a set of mantissas for a single channel in a single block.
    1197             :  *
    1198             :  * @param s           Mantissa count context
    1199             :  * @param fixed_coef  unquantized fixed-point coefficients
    1200             :  * @param exp         exponents
    1201             :  * @param bap         bit allocation pointer indices
    1202             :  * @param[out] qmant  quantized coefficients
    1203             :  * @param start_freq  starting coefficient bin
    1204             :  * @param end_freq    ending coefficient bin
    1205             :  */
    1206       15210 : static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
    1207             :                                       uint8_t *exp, uint8_t *bap,
    1208             :                                       int16_t *qmant, int start_freq,
    1209             :                                       int end_freq)
    1210             : {
    1211             :     int i;
    1212             : 
    1213     1638762 :     for (i = start_freq; i < end_freq; i++) {
    1214     1623552 :         int c = fixed_coef[i];
    1215     1623552 :         int e = exp[i];
    1216     1623552 :         int v = bap[i];
    1217     1623552 :         if (v)
    1218     1121862 :         switch (v) {
    1219      473300 :         case 1:
    1220      473300 :             v = sym_quant(c, e, 3);
    1221      473300 :             switch (s->mant1_cnt) {
    1222      159865 :             case 0:
    1223      159865 :                 s->qmant1_ptr = &qmant[i];
    1224      159865 :                 v = 9 * v;
    1225      159865 :                 s->mant1_cnt = 1;
    1226      159865 :                 break;
    1227      157814 :             case 1:
    1228      157814 :                 *s->qmant1_ptr += 3 * v;
    1229      157814 :                 s->mant1_cnt = 2;
    1230      157814 :                 v = 128;
    1231      157814 :                 break;
    1232      155621 :             default:
    1233      155621 :                 *s->qmant1_ptr += v;
    1234      155621 :                 s->mant1_cnt = 0;
    1235      155621 :                 v = 128;
    1236      155621 :                 break;
    1237             :             }
    1238      473300 :             break;
    1239      183360 :         case 2:
    1240      183360 :             v = sym_quant(c, e, 5);
    1241      183360 :             switch (s->mant2_cnt) {
    1242       63147 :             case 0:
    1243       63147 :                 s->qmant2_ptr = &qmant[i];
    1244       63147 :                 v = 25 * v;
    1245       63147 :                 s->mant2_cnt = 1;
    1246       63147 :                 break;
    1247       61099 :             case 1:
    1248       61099 :                 *s->qmant2_ptr += 5 * v;
    1249       61099 :                 s->mant2_cnt = 2;
    1250       61099 :                 v = 128;
    1251       61099 :                 break;
    1252       59114 :             default:
    1253       59114 :                 *s->qmant2_ptr += v;
    1254       59114 :                 s->mant2_cnt = 0;
    1255       59114 :                 v = 128;
    1256       59114 :                 break;
    1257             :             }
    1258      183360 :             break;
    1259      191598 :         case 3:
    1260      191598 :             v = sym_quant(c, e, 7);
    1261      191598 :             break;
    1262       84614 :         case 4:
    1263       84614 :             v = sym_quant(c, e, 11);
    1264       84614 :             switch (s->mant4_cnt) {
    1265       43497 :             case 0:
    1266       43497 :                 s->qmant4_ptr = &qmant[i];
    1267       43497 :                 v = 11 * v;
    1268       43497 :                 s->mant4_cnt = 1;
    1269       43497 :                 break;
    1270       41117 :             default:
    1271       41117 :                 *s->qmant4_ptr += v;
    1272       41117 :                 s->mant4_cnt = 0;
    1273       41117 :                 v = 128;
    1274       41117 :                 break;
    1275             :             }
    1276       84614 :             break;
    1277       57241 :         case 5:
    1278       57241 :             v = sym_quant(c, e, 15);
    1279       57241 :             break;
    1280           0 :         case 14:
    1281           0 :             v = asym_quant(c, e, 14);
    1282           0 :             break;
    1283           0 :         case 15:
    1284           0 :             v = asym_quant(c, e, 16);
    1285           0 :             break;
    1286      131749 :         default:
    1287      131749 :             v = asym_quant(c, e, v - 1);
    1288      131749 :             break;
    1289             :         }
    1290     2125242 :         qmant[i] = v;
    1291             :     }
    1292       15210 : }
    1293             : 
    1294             : 
    1295             : /**
    1296             :  * Quantize mantissas using coefficients, exponents, and bit allocation pointers.
    1297             :  *
    1298             :  * @param s  AC-3 encoder private context
    1299             :  */
    1300        1097 : void ff_ac3_quantize_mantissas(AC3EncodeContext *s)
    1301             : {
    1302        1097 :     int blk, ch, ch0=0, got_cpl;
    1303             : 
    1304        7679 :     for (blk = 0; blk < s->num_blocks; blk++) {
    1305        6582 :         AC3Block *block = &s->blocks[blk];
    1306        6582 :         AC3Mant m = { 0 };
    1307             : 
    1308        6582 :         got_cpl = !block->cpl_in_use;
    1309       21792 :         for (ch = 1; ch <= s->channels; ch++) {
    1310       15210 :             if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
    1311        4314 :                 ch0     = ch - 1;
    1312        4314 :                 ch      = CPL_CH;
    1313        4314 :                 got_cpl = 1;
    1314             :             }
    1315       45630 :             quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
    1316       15210 :                                       s->blocks[s->exp_ref_block[ch][blk]].exp[ch],
    1317       15210 :                                       s->ref_bap[ch][blk], block->qmant[ch],
    1318             :                                       s->start_freq[ch], block->end_freq[ch]);
    1319       15210 :             if (ch == CPL_CH)
    1320        4314 :                 ch = ch0;
    1321             :         }
    1322             :     }
    1323        1097 : }
    1324             : 
    1325             : 
    1326             : /*
    1327             :  * Write the AC-3 frame header to the output bitstream.
    1328             :  */
    1329         824 : static void ac3_output_frame_header(AC3EncodeContext *s)
    1330             : {
    1331         824 :     AC3EncOptions *opt = &s->options;
    1332             : 
    1333         824 :     put_bits(&s->pb, 16, 0x0b77);   /* frame header */
    1334         824 :     put_bits(&s->pb, 16, 0);        /* crc1: will be filled later */
    1335         824 :     put_bits(&s->pb, 2,  s->bit_alloc.sr_code);
    1336         824 :     put_bits(&s->pb, 6,  s->frame_size_code + (s->frame_size - s->frame_size_min) / 2);
    1337         824 :     put_bits(&s->pb, 5,  s->bitstream_id);
    1338         824 :     put_bits(&s->pb, 3,  s->bitstream_mode);
    1339         824 :     put_bits(&s->pb, 3,  s->channel_mode);
    1340         824 :     if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO)
    1341           0 :         put_bits(&s->pb, 2, s->center_mix_level);
    1342         824 :     if (s->channel_mode & 0x04)
    1343           0 :         put_bits(&s->pb, 2, s->surround_mix_level);
    1344         824 :     if (s->channel_mode == AC3_CHMODE_STEREO)
    1345         446 :         put_bits(&s->pb, 2, opt->dolby_surround_mode);
    1346         824 :     put_bits(&s->pb, 1, s->lfe_on); /* LFE */
    1347         824 :     put_bits(&s->pb, 5, -opt->dialogue_level);
    1348         824 :     put_bits(&s->pb, 1, 0);         /* no compression control word */
    1349         824 :     put_bits(&s->pb, 1, 0);         /* no lang code */
    1350         824 :     put_bits(&s->pb, 1, opt->audio_production_info);
    1351         824 :     if (opt->audio_production_info) {
    1352           0 :         put_bits(&s->pb, 5, opt->mixing_level - 80);
    1353           0 :         put_bits(&s->pb, 2, opt->room_type);
    1354             :     }
    1355         824 :     put_bits(&s->pb, 1, opt->copyright);
    1356         824 :     put_bits(&s->pb, 1, opt->original);
    1357         824 :     if (s->bitstream_id == 6) {
    1358             :         /* alternate bit stream syntax */
    1359           0 :         put_bits(&s->pb, 1, opt->extended_bsi_1);
    1360           0 :         if (opt->extended_bsi_1) {
    1361           0 :             put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
    1362           0 :             put_bits(&s->pb, 3, s->ltrt_center_mix_level);
    1363           0 :             put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
    1364           0 :             put_bits(&s->pb, 3, s->loro_center_mix_level);
    1365           0 :             put_bits(&s->pb, 3, s->loro_surround_mix_level);
    1366             :         }
    1367           0 :         put_bits(&s->pb, 1, opt->extended_bsi_2);
    1368           0 :         if (opt->extended_bsi_2) {
    1369           0 :             put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
    1370           0 :             put_bits(&s->pb, 2, opt->dolby_headphone_mode);
    1371           0 :             put_bits(&s->pb, 1, opt->ad_converter_type);
    1372           0 :             put_bits(&s->pb, 9, 0);     /* xbsi2 and encinfo : reserved */
    1373             :         }
    1374             :     } else {
    1375         824 :     put_bits(&s->pb, 1, 0);         /* no time code 1 */
    1376         824 :     put_bits(&s->pb, 1, 0);         /* no time code 2 */
    1377             :     }
    1378         824 :     put_bits(&s->pb, 1, 0);         /* no additional bit stream info */
    1379         824 : }
    1380             : 
    1381             : 
    1382             : /*
    1383             :  * Write one audio block to the output bitstream.
    1384             :  */
    1385        6582 : static void output_audio_block(AC3EncodeContext *s, int blk)
    1386             : {
    1387        6582 :     int ch, i, baie, bnd, got_cpl, av_uninit(ch0);
    1388        6582 :     AC3Block *block = &s->blocks[blk];
    1389             : 
    1390             :     /* block switching */
    1391        6582 :     if (!s->eac3) {
    1392       12564 :         for (ch = 0; ch < s->fbw_channels; ch++)
    1393        7620 :             put_bits(&s->pb, 1, 0);
    1394             :     }
    1395             : 
    1396             :     /* dither flags */
    1397        6582 :     if (!s->eac3) {
    1398       12564 :         for (ch = 0; ch < s->fbw_channels; ch++)
    1399        7620 :             put_bits(&s->pb, 1, 1);
    1400             :     }
    1401             : 
    1402             :     /* dynamic range codes */
    1403        6582 :     put_bits(&s->pb, 1, 0);
    1404             : 
    1405             :     /* spectral extension */
    1406        6582 :     if (s->eac3)
    1407        1638 :         put_bits(&s->pb, 1, 0);
    1408             : 
    1409             :     /* channel coupling */
    1410        6582 :     if (!s->eac3)
    1411        4944 :         put_bits(&s->pb, 1, block->new_cpl_strategy);
    1412        6582 :     if (block->new_cpl_strategy) {
    1413        1097 :         if (!s->eac3)
    1414         824 :             put_bits(&s->pb, 1, block->cpl_in_use);
    1415        1097 :         if (block->cpl_in_use) {
    1416             :             int start_sub, end_sub;
    1417         719 :             if (s->eac3)
    1418         273 :                 put_bits(&s->pb, 1, 0); /* enhanced coupling */
    1419         719 :             if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) {
    1420        1338 :                 for (ch = 1; ch <= s->fbw_channels; ch++)
    1421         892 :                     put_bits(&s->pb, 1, block->channel_in_cpl[ch]);
    1422             :             }
    1423         719 :             if (s->channel_mode == AC3_CHMODE_STEREO)
    1424         719 :                 put_bits(&s->pb, 1, 0); /* phase flags in use */
    1425         719 :             start_sub = (s->start_freq[CPL_CH] - 37) / 12;
    1426         719 :             end_sub   = (s->cpl_end_freq       - 37) / 12;
    1427         719 :             put_bits(&s->pb, 4, start_sub);
    1428         719 :             put_bits(&s->pb, 4, end_sub - 3);
    1429             :             /* coupling band structure */
    1430         719 :             if (s->eac3) {
    1431         273 :                 put_bits(&s->pb, 1, 0); /* use default */
    1432             :             } else {
    1433        2230 :                 for (bnd = start_sub+1; bnd < end_sub; bnd++)
    1434        1784 :                     put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]);
    1435             :             }
    1436             :         }
    1437             :     }
    1438             : 
    1439             :     /* coupling coordinates */
    1440        6582 :     if (block->cpl_in_use) {
    1441       12942 :         for (ch = 1; ch <= s->fbw_channels; ch++) {
    1442        8628 :             if (block->channel_in_cpl[ch]) {
    1443        8628 :                 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
    1444        8082 :                     put_bits(&s->pb, 1, block->new_cpl_coords[ch]);
    1445        8628 :                 if (block->new_cpl_coords[ch]) {
    1446        1470 :                     put_bits(&s->pb, 2, block->cpl_master_exp[ch]);
    1447        7350 :                     for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
    1448        5880 :                         put_bits(&s->pb, 4, block->cpl_coord_exp [ch][bnd]);
    1449        5880 :                         put_bits(&s->pb, 4, block->cpl_coord_mant[ch][bnd]);
    1450             :                     }
    1451             :                 }
    1452             :             }
    1453             :         }
    1454             :     }
    1455             : 
    1456             :     /* stereo rematrixing */
    1457        6582 :     if (s->channel_mode == AC3_CHMODE_STEREO) {
    1458        4314 :         if (!s->eac3 || blk > 0)
    1459        4041 :             put_bits(&s->pb, 1, block->new_rematrixing_strategy);
    1460        4314 :         if (block->new_rematrixing_strategy) {
    1461             :             /* rematrixing flags */
    1462       11070 :             for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++)
    1463        8856 :                 put_bits(&s->pb, 1, block->rematrixing_flags[bnd]);
    1464             :         }
    1465             :     }
    1466             : 
    1467             :     /* exponent strategy */
    1468        6582 :     if (!s->eac3) {
    1469       15240 :         for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++)
    1470       10296 :             put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
    1471        4944 :         if (s->lfe_on)
    1472           0 :             put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
    1473             :     }
    1474             : 
    1475             :     /* bandwidth */
    1476       17478 :     for (ch = 1; ch <= s->fbw_channels; ch++) {
    1477       10896 :         if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch])
    1478        1826 :             put_bits(&s->pb, 6, s->bandwidth_code);
    1479             :     }
    1480             : 
    1481             :     /* exponents */
    1482       21792 :     for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
    1483             :         int nb_groups;
    1484       15210 :         int cpl = (ch == CPL_CH);
    1485             : 
    1486       15210 :         if (s->exp_strategy[ch][blk] == EXP_REUSE)
    1487        8824 :             continue;
    1488             : 
    1489             :         /* DC exponent */
    1490        6386 :         put_bits(&s->pb, 4, block->grouped_exp[ch][0] >> cpl);
    1491             : 
    1492             :         /* exponent groups */
    1493        6386 :         nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]];
    1494      116287 :         for (i = 1; i <= nb_groups; i++)
    1495      109901 :             put_bits(&s->pb, 7, block->grouped_exp[ch][i]);
    1496             : 
    1497             :         /* gain range info */
    1498        6386 :         if (ch != s->lfe_channel && !cpl)
    1499        4304 :             put_bits(&s->pb, 2, 0);
    1500             :     }
    1501             : 
    1502             :     /* bit allocation info */
    1503        6582 :     if (!s->eac3) {
    1504        4944 :         baie = (blk == 0);
    1505        4944 :         put_bits(&s->pb, 1, baie);
    1506        4944 :         if (baie) {
    1507         824 :             put_bits(&s->pb, 2, s->slow_decay_code);
    1508         824 :             put_bits(&s->pb, 2, s->fast_decay_code);
    1509         824 :             put_bits(&s->pb, 2, s->slow_gain_code);
    1510         824 :             put_bits(&s->pb, 2, s->db_per_bit_code);
    1511         824 :             put_bits(&s->pb, 3, s->floor_code);
    1512             :         }
    1513             :     }
    1514             : 
    1515             :     /* snr offset */
    1516        6582 :     if (!s->eac3) {
    1517        4944 :         put_bits(&s->pb, 1, block->new_snr_offsets);
    1518        4944 :         if (block->new_snr_offsets) {
    1519         824 :             put_bits(&s->pb, 6, s->coarse_snr_offset);
    1520        2540 :             for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
    1521        1716 :                 put_bits(&s->pb, 4, s->fine_snr_offset[ch]);
    1522        1716 :                 put_bits(&s->pb, 3, s->fast_gain_code[ch]);
    1523             :             }
    1524             :         }
    1525             :     } else {
    1526        1638 :         put_bits(&s->pb, 1, 0); /* no converter snr offset */
    1527             :     }
    1528             : 
    1529             :     /* coupling leak */
    1530        6582 :     if (block->cpl_in_use) {
    1531        4314 :         if (!s->eac3 || block->new_cpl_leak != 2)
    1532        4041 :             put_bits(&s->pb, 1, block->new_cpl_leak);
    1533        4314 :         if (block->new_cpl_leak) {
    1534         719 :             put_bits(&s->pb, 3, s->bit_alloc.cpl_fast_leak);
    1535         719 :             put_bits(&s->pb, 3, s->bit_alloc.cpl_slow_leak);
    1536             :         }
    1537             :     }
    1538             : 
    1539        6582 :     if (!s->eac3) {
    1540        4944 :         put_bits(&s->pb, 1, 0); /* no delta bit allocation */
    1541        4944 :         put_bits(&s->pb, 1, 0); /* no data to skip */
    1542             :     }
    1543             : 
    1544             :     /* mantissas */
    1545        6582 :     got_cpl = !block->cpl_in_use;
    1546       21792 :     for (ch = 1; ch <= s->channels; ch++) {
    1547             :         int b, q;
    1548             : 
    1549       15210 :         if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
    1550        4314 :             ch0     = ch - 1;
    1551        4314 :             ch      = CPL_CH;
    1552        4314 :             got_cpl = 1;
    1553             :         }
    1554     1638762 :         for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) {
    1555     1623552 :             q = block->qmant[ch][i];
    1556     1623552 :             b = s->ref_bap[ch][blk][i];
    1557     1623552 :             switch (b) {
    1558      501690 :             case 0:                                          break;
    1559      473300 :             case 1: if (q != 128) put_bits (&s->pb,   5, q); break;
    1560      183360 :             case 2: if (q != 128) put_bits (&s->pb,   7, q); break;
    1561      191598 :             case 3:               put_sbits(&s->pb,   3, q); break;
    1562       84614 :             case 4: if (q != 128) put_bits (&s->pb,   7, q); break;
    1563           0 :             case 14:              put_sbits(&s->pb,  14, q); break;
    1564           0 :             case 15:              put_sbits(&s->pb,  16, q); break;
    1565      188990 :             default:              put_sbits(&s->pb, b-1, q); break;
    1566             :             }
    1567             :         }
    1568       15210 :         if (ch == CPL_CH)
    1569        4314 :             ch = ch0;
    1570             :     }
    1571        6582 : }
    1572             : 
    1573             : 
    1574             : /** CRC-16 Polynomial */
    1575             : #define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16))
    1576             : 
    1577             : 
    1578        1006 : static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly)
    1579             : {
    1580             :     unsigned int c;
    1581             : 
    1582        1006 :     c = 0;
    1583       17130 :     while (a) {
    1584       15118 :         if (a & 1)
    1585        7198 :             c ^= b;
    1586       15118 :         a = a >> 1;
    1587       15118 :         b = b << 1;
    1588       15118 :         if (b & (1 << 16))
    1589        7288 :             b ^= poly;
    1590             :     }
    1591        1006 :     return c;
    1592             : }
    1593             : 
    1594             : 
    1595          12 : static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly)
    1596             : {
    1597             :     unsigned int r;
    1598          12 :     r = 1;
    1599         166 :     while (n) {
    1600         142 :         if (n & 1)
    1601          40 :             r = mul_poly(r, a, poly);
    1602         142 :         a = mul_poly(a, a, poly);
    1603         142 :         n >>= 1;
    1604             :     }
    1605          12 :     return r;
    1606             : }
    1607             : 
    1608             : 
    1609             : /*
    1610             :  * Fill the end of the frame with 0's and compute the two CRCs.
    1611             :  */
    1612        1097 : static void output_frame_end(AC3EncodeContext *s)
    1613             : {
    1614        1097 :     const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI);
    1615             :     int frame_size_58, pad_bytes, crc1, crc2_partial, crc2, crc_inv;
    1616             :     uint8_t *frame;
    1617             : 
    1618        1097 :     frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1;
    1619             : 
    1620             :     /* pad the remainder of the frame with zeros */
    1621             :     av_assert2(s->frame_size * 8 - put_bits_count(&s->pb) >= 18);
    1622        1097 :     flush_put_bits(&s->pb);
    1623        1097 :     frame = s->pb.buf;
    1624        1097 :     pad_bytes = s->frame_size - (put_bits_ptr(&s->pb) - frame) - 2;
    1625             :     av_assert2(pad_bytes >= 0);
    1626        1097 :     if (pad_bytes > 0)
    1627         975 :         memset(put_bits_ptr(&s->pb), 0, pad_bytes);
    1628             : 
    1629        1097 :     if (s->eac3) {
    1630             :         /* compute crc2 */
    1631         273 :         crc2_partial = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 5);
    1632             :     } else {
    1633             :     /* compute crc1 */
    1634             :     /* this is not so easy because it is at the beginning of the data... */
    1635         824 :     crc1    = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4));
    1636         824 :     crc_inv = s->crc_inv[s->frame_size > s->frame_size_min];
    1637         824 :     crc1    = mul_poly(crc_inv, crc1, CRC16_POLY);
    1638         824 :     AV_WB16(frame + 2, crc1);
    1639             : 
    1640             :     /* compute crc2 */
    1641         824 :     crc2_partial = av_crc(crc_ctx, 0, frame + frame_size_58,
    1642         824 :                           s->frame_size - frame_size_58 - 3);
    1643             :     }
    1644        1097 :     crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1);
    1645             :     /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */
    1646        1097 :     if (crc2 == 0x770B) {
    1647           0 :         frame[s->frame_size - 3] ^= 0x1;
    1648           0 :         crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1);
    1649             :     }
    1650        1097 :     crc2 = av_bswap16(crc2);
    1651        1097 :     AV_WB16(frame + s->frame_size - 2, crc2);
    1652        1097 : }
    1653             : 
    1654             : 
    1655             : /**
    1656             :  * Write the frame to the output bitstream.
    1657             :  *
    1658             :  * @param s      AC-3 encoder private context
    1659             :  * @param frame  output data buffer
    1660             :  */
    1661        1097 : void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame)
    1662             : {
    1663             :     int blk;
    1664             : 
    1665        1097 :     init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE);
    1666             : 
    1667        1097 :     s->output_frame_header(s);
    1668             : 
    1669        7679 :     for (blk = 0; blk < s->num_blocks; blk++)
    1670        6582 :         output_audio_block(s, blk);
    1671             : 
    1672        1097 :     output_frame_end(s);
    1673        1097 : }
    1674             : 
    1675             : 
    1676           6 : static void dprint_options(AC3EncodeContext *s)
    1677             : {
    1678             : #ifdef DEBUG
    1679             :     AVCodecContext *avctx = s->avctx;
    1680             :     AC3EncOptions *opt = &s->options;
    1681             :     char strbuf[32];
    1682             : 
    1683             :     switch (s->bitstream_id) {
    1684             :     case  6:  av_strlcpy(strbuf, "AC-3 (alt syntax)",       32); break;
    1685             :     case  8:  av_strlcpy(strbuf, "AC-3 (standard)",         32); break;
    1686             :     case  9:  av_strlcpy(strbuf, "AC-3 (dnet half-rate)",   32); break;
    1687             :     case 10:  av_strlcpy(strbuf, "AC-3 (dnet quater-rate)", 32); break;
    1688             :     case 16:  av_strlcpy(strbuf, "E-AC-3 (enhanced)",       32); break;
    1689             :     default: snprintf(strbuf, 32, "ERROR");
    1690             :     }
    1691             :     ff_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id);
    1692             :     ff_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt));
    1693             :     av_get_channel_layout_string(strbuf, 32, s->channels, avctx->channel_layout);
    1694             :     ff_dlog(avctx, "channel_layout: %s\n", strbuf);
    1695             :     ff_dlog(avctx, "sample_rate: %d\n", s->sample_rate);
    1696             :     ff_dlog(avctx, "bit_rate: %d\n", s->bit_rate);
    1697             :     ff_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code);
    1698             :     if (s->cutoff)
    1699             :         ff_dlog(avctx, "cutoff: %d\n", s->cutoff);
    1700             : 
    1701             :     ff_dlog(avctx, "per_frame_metadata: %s\n",
    1702             :             opt->allow_per_frame_metadata?"on":"off");
    1703             :     if (s->has_center)
    1704             :         ff_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level,
    1705             :                 s->center_mix_level);
    1706             :     else
    1707             :         ff_dlog(avctx, "center_mixlev: {not written}\n");
    1708             :     if (s->has_surround)
    1709             :         ff_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level,
    1710             :                 s->surround_mix_level);
    1711             :     else
    1712             :         ff_dlog(avctx, "surround_mixlev: {not written}\n");
    1713             :     if (opt->audio_production_info) {
    1714             :         ff_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level);
    1715             :         switch (opt->room_type) {
    1716             :         case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
    1717             :         case AC3ENC_OPT_LARGE_ROOM:    av_strlcpy(strbuf, "large", 32);        break;
    1718             :         case AC3ENC_OPT_SMALL_ROOM:    av_strlcpy(strbuf, "small", 32);        break;
    1719             :         default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type);
    1720             :         }
    1721             :         ff_dlog(avctx, "room_type: %s\n", strbuf);
    1722             :     } else {
    1723             :         ff_dlog(avctx, "mixing_level: {not written}\n");
    1724             :         ff_dlog(avctx, "room_type: {not written}\n");
    1725             :     }
    1726             :     ff_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off");
    1727             :     ff_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level);
    1728             :     if (s->channel_mode == AC3_CHMODE_STEREO) {
    1729             :         switch (opt->dolby_surround_mode) {
    1730             :         case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
    1731             :         case AC3ENC_OPT_MODE_ON:       av_strlcpy(strbuf, "on", 32);           break;
    1732             :         case AC3ENC_OPT_MODE_OFF:      av_strlcpy(strbuf, "off", 32);          break;
    1733             :         default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode);
    1734             :         }
    1735             :         ff_dlog(avctx, "dsur_mode: %s\n", strbuf);
    1736             :     } else {
    1737             :         ff_dlog(avctx, "dsur_mode: {not written}\n");
    1738             :     }
    1739             :     ff_dlog(avctx, "original: %s\n", opt->original?"on":"off");
    1740             : 
    1741             :     if (s->bitstream_id == 6) {
    1742             :         if (opt->extended_bsi_1) {
    1743             :             switch (opt->preferred_stereo_downmix) {
    1744             :             case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
    1745             :             case AC3ENC_OPT_DOWNMIX_LTRT:  av_strlcpy(strbuf, "ltrt", 32);         break;
    1746             :             case AC3ENC_OPT_DOWNMIX_LORO:  av_strlcpy(strbuf, "loro", 32);         break;
    1747             :             default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix);
    1748             :             }
    1749             :             ff_dlog(avctx, "dmix_mode: %s\n", strbuf);
    1750             :             ff_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n",
    1751             :                     opt->ltrt_center_mix_level, s->ltrt_center_mix_level);
    1752             :             ff_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n",
    1753             :                     opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level);
    1754             :             ff_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n",
    1755             :                     opt->loro_center_mix_level, s->loro_center_mix_level);
    1756             :             ff_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n",
    1757             :                     opt->loro_surround_mix_level, s->loro_surround_mix_level);
    1758             :         } else {
    1759             :             ff_dlog(avctx, "extended bitstream info 1: {not written}\n");
    1760             :         }
    1761             :         if (opt->extended_bsi_2) {
    1762             :             switch (opt->dolby_surround_ex_mode) {
    1763             :             case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
    1764             :             case AC3ENC_OPT_MODE_ON:       av_strlcpy(strbuf, "on", 32);           break;
    1765             :             case AC3ENC_OPT_MODE_OFF:      av_strlcpy(strbuf, "off", 32);          break;
    1766             :             default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode);
    1767             :             }
    1768             :             ff_dlog(avctx, "dsurex_mode: %s\n", strbuf);
    1769             :             switch (opt->dolby_headphone_mode) {
    1770             :             case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
    1771             :             case AC3ENC_OPT_MODE_ON:       av_strlcpy(strbuf, "on", 32);           break;
    1772             :             case AC3ENC_OPT_MODE_OFF:      av_strlcpy(strbuf, "off", 32);          break;
    1773             :             default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode);
    1774             :             }
    1775             :             ff_dlog(avctx, "dheadphone_mode: %s\n", strbuf);
    1776             : 
    1777             :             switch (opt->ad_converter_type) {
    1778             :             case AC3ENC_OPT_ADCONV_STANDARD: av_strlcpy(strbuf, "standard", 32); break;
    1779             :             case AC3ENC_OPT_ADCONV_HDCD:     av_strlcpy(strbuf, "hdcd", 32);     break;
    1780             :             default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type);
    1781             :             }
    1782             :             ff_dlog(avctx, "ad_conv_type: %s\n", strbuf);
    1783             :         } else {
    1784             :             ff_dlog(avctx, "extended bitstream info 2: {not written}\n");
    1785             :         }
    1786             :     }
    1787             : #endif
    1788           6 : }
    1789             : 
    1790             : 
    1791             : #define FLT_OPTION_THRESHOLD 0.01
    1792             : 
    1793           0 : static int validate_float_option(float v, const float *v_list, int v_list_size)
    1794             : {
    1795             :     int i;
    1796             : 
    1797           0 :     for (i = 0; i < v_list_size; i++) {
    1798           0 :         if (v < (v_list[i] + FLT_OPTION_THRESHOLD) &&
    1799           0 :             v > (v_list[i] - FLT_OPTION_THRESHOLD))
    1800           0 :             break;
    1801             :     }
    1802           0 :     if (i == v_list_size)
    1803           0 :         return -1;
    1804             : 
    1805           0 :     return i;
    1806             : }
    1807             : 
    1808             : 
    1809           0 : static void validate_mix_level(void *log_ctx, const char *opt_name,
    1810             :                                float *opt_param, const float *list,
    1811             :                                int list_size, int default_value, int min_value,
    1812             :                                int *ctx_param)
    1813             : {
    1814           0 :     int mixlev = validate_float_option(*opt_param, list, list_size);
    1815           0 :     if (mixlev < min_value) {
    1816           0 :         mixlev = default_value;
    1817           0 :         if (*opt_param >= 0.0) {
    1818           0 :             av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using "
    1819           0 :                    "default value: %0.3f\n", opt_name, list[mixlev]);
    1820             :         }
    1821             :     }
    1822           0 :     *opt_param = list[mixlev];
    1823           0 :     *ctx_param = mixlev;
    1824           0 : }
    1825             : 
    1826             : 
    1827             : /**
    1828             :  * Validate metadata options as set by AVOption system.
    1829             :  * These values can optionally be changed per-frame.
    1830             :  *
    1831             :  * @param s  AC-3 encoder private context
    1832             :  */
    1833           6 : int ff_ac3_validate_metadata(AC3EncodeContext *s)
    1834             : {
    1835           6 :     AVCodecContext *avctx = s->avctx;
    1836           6 :     AC3EncOptions *opt = &s->options;
    1837             : 
    1838           6 :     opt->audio_production_info = 0;
    1839           6 :     opt->extended_bsi_1        = 0;
    1840           6 :     opt->extended_bsi_2        = 0;
    1841           6 :     opt->eac3_mixing_metadata  = 0;
    1842           6 :     opt->eac3_info_metadata    = 0;
    1843             : 
    1844             :     /* determine mixing metadata / xbsi1 use */
    1845           6 :     if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) {
    1846           0 :         opt->extended_bsi_1       = 1;
    1847           0 :         opt->eac3_mixing_metadata = 1;
    1848             :     }
    1849           6 :     if (s->has_center &&
    1850           0 :         (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) {
    1851           0 :         opt->extended_bsi_1       = 1;
    1852           0 :         opt->eac3_mixing_metadata = 1;
    1853             :     }
    1854           6 :     if (s->has_surround &&
    1855           0 :         (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) {
    1856           0 :         opt->extended_bsi_1       = 1;
    1857           0 :         opt->eac3_mixing_metadata = 1;
    1858             :     }
    1859             : 
    1860           6 :     if (s->eac3) {
    1861             :         /* determine info metadata use */
    1862           1 :         if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN)
    1863           0 :             opt->eac3_info_metadata = 1;
    1864           1 :         if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE)
    1865           0 :             opt->eac3_info_metadata = 1;
    1866           2 :         if (s->channel_mode == AC3_CHMODE_STEREO &&
    1867           2 :             (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE))
    1868           0 :             opt->eac3_info_metadata = 1;
    1869           1 :         if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
    1870           0 :             opt->eac3_info_metadata = 1;
    1871           2 :         if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE ||
    1872           1 :             opt->ad_converter_type != AC3ENC_OPT_NONE) {
    1873           0 :             opt->audio_production_info = 1;
    1874           0 :             opt->eac3_info_metadata    = 1;
    1875             :         }
    1876             :     } else {
    1877             :         /* determine audio production info use */
    1878           5 :         if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE)
    1879           0 :             opt->audio_production_info = 1;
    1880             : 
    1881             :         /* determine xbsi2 use */
    1882           5 :         if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
    1883           0 :             opt->extended_bsi_2 = 1;
    1884           5 :         if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE)
    1885           0 :             opt->extended_bsi_2 = 1;
    1886           5 :         if (opt->ad_converter_type != AC3ENC_OPT_NONE)
    1887           0 :             opt->extended_bsi_2 = 1;
    1888             :     }
    1889             : 
    1890             :     /* validate AC-3 mixing levels */
    1891           6 :     if (!s->eac3) {
    1892           5 :         if (s->has_center) {
    1893           0 :             validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
    1894             :                             cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
    1895             :                             &s->center_mix_level);
    1896             :         }
    1897           5 :         if (s->has_surround) {
    1898           0 :             validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
    1899             :                             surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
    1900             :                             &s->surround_mix_level);
    1901             :         }
    1902             :     }
    1903             : 
    1904             :     /* validate extended bsi 1 / mixing metadata */
    1905           6 :     if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) {
    1906             :         /* default preferred stereo downmix */
    1907           0 :         if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE)
    1908           0 :             opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED;
    1909           0 :         if (!s->eac3 || s->has_center) {
    1910             :             /* validate Lt/Rt center mix level */
    1911           0 :             validate_mix_level(avctx, "ltrt_center_mix_level",
    1912             :                                &opt->ltrt_center_mix_level, extmixlev_options,
    1913             :                                EXTMIXLEV_NUM_OPTIONS, 5, 0,
    1914             :                                &s->ltrt_center_mix_level);
    1915             :             /* validate Lo/Ro center mix level */
    1916           0 :             validate_mix_level(avctx, "loro_center_mix_level",
    1917             :                                &opt->loro_center_mix_level, extmixlev_options,
    1918             :                                EXTMIXLEV_NUM_OPTIONS, 5, 0,
    1919             :                                &s->loro_center_mix_level);
    1920             :         }
    1921           0 :         if (!s->eac3 || s->has_surround) {
    1922             :             /* validate Lt/Rt surround mix level */
    1923           0 :             validate_mix_level(avctx, "ltrt_surround_mix_level",
    1924             :                                &opt->ltrt_surround_mix_level, extmixlev_options,
    1925             :                                EXTMIXLEV_NUM_OPTIONS, 6, 3,
    1926             :                                &s->ltrt_surround_mix_level);
    1927             :             /* validate Lo/Ro surround mix level */
    1928           0 :             validate_mix_level(avctx, "loro_surround_mix_level",
    1929             :                                &opt->loro_surround_mix_level, extmixlev_options,
    1930             :                                EXTMIXLEV_NUM_OPTIONS, 6, 3,
    1931             :                                &s->loro_surround_mix_level);
    1932             :         }
    1933             :     }
    1934             : 
    1935             :     /* validate audio service type / channels combination */
    1936           6 :     if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
    1937           6 :          avctx->channels == 1) ||
    1938          12 :         ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
    1939          12 :           avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY  ||
    1940           6 :           avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
    1941           0 :          && avctx->channels > 1)) {
    1942           0 :         av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
    1943             :                                     "specified number of channels\n");
    1944           0 :         return AVERROR(EINVAL);
    1945             :     }
    1946             : 
    1947             :     /* validate extended bsi 2 / info metadata */
    1948           6 :     if (opt->extended_bsi_2 || opt->eac3_info_metadata) {
    1949             :         /* default dolby headphone mode */
    1950           0 :         if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE)
    1951           0 :             opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED;
    1952             :         /* default dolby surround ex mode */
    1953           0 :         if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE)
    1954           0 :             opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED;
    1955             :         /* default A/D converter type */
    1956           0 :         if (opt->ad_converter_type == AC3ENC_OPT_NONE)
    1957           0 :             opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD;
    1958             :     }
    1959             : 
    1960             :     /* copyright & original defaults */
    1961           6 :     if (!s->eac3 || opt->eac3_info_metadata) {
    1962             :         /* default copyright */
    1963           5 :         if (opt->copyright == AC3ENC_OPT_NONE)
    1964           5 :             opt->copyright = AC3ENC_OPT_OFF;
    1965             :         /* default original */
    1966           5 :         if (opt->original == AC3ENC_OPT_NONE)
    1967           5 :             opt->original = AC3ENC_OPT_ON;
    1968             :     }
    1969             : 
    1970             :     /* dolby surround mode default */
    1971           6 :     if (!s->eac3 || opt->eac3_info_metadata) {
    1972           5 :         if (opt->dolby_surround_mode == AC3ENC_OPT_NONE)
    1973           5 :             opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED;
    1974             :     }
    1975             : 
    1976             :     /* validate audio production info */
    1977           6 :     if (opt->audio_production_info) {
    1978           0 :         if (opt->mixing_level == AC3ENC_OPT_NONE) {
    1979           0 :             av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
    1980             :                    "room_type is set\n");
    1981           0 :             return AVERROR(EINVAL);
    1982             :         }
    1983           0 :         if (opt->mixing_level < 80) {
    1984           0 :             av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between "
    1985             :                    "80dB and 111dB\n");
    1986           0 :             return AVERROR(EINVAL);
    1987             :         }
    1988             :         /* default room type */
    1989           0 :         if (opt->room_type == AC3ENC_OPT_NONE)
    1990           0 :             opt->room_type = AC3ENC_OPT_NOT_INDICATED;
    1991             :     }
    1992             : 
    1993             :     /* set bitstream id for alternate bitstream syntax */
    1994           6 :     if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2)) {
    1995           0 :         if (s->bitstream_id > 8 && s->bitstream_id < 11) {
    1996             :             static int warn_once = 1;
    1997           0 :             if (warn_once) {
    1998           0 :                 av_log(avctx, AV_LOG_WARNING, "alternate bitstream syntax is "
    1999             :                        "not compatible with reduced samplerates. writing of "
    2000             :                        "extended bitstream information will be disabled.\n");
    2001           0 :                 warn_once = 0;
    2002             :             }
    2003             :         } else {
    2004           0 :             s->bitstream_id = 6;
    2005             :         }
    2006             :     }
    2007             : 
    2008           6 :     return 0;
    2009             : }
    2010             : 
    2011             : 
    2012             : /**
    2013             :  * Finalize encoding and free any memory allocated by the encoder.
    2014             :  *
    2015             :  * @param avctx  Codec context
    2016             :  */
    2017           6 : av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
    2018             : {
    2019             :     int blk, ch;
    2020           6 :     AC3EncodeContext *s = avctx->priv_data;
    2021             : 
    2022           6 :     av_freep(&s->windowed_samples);
    2023           6 :     if (s->planar_samples)
    2024          15 :     for (ch = 0; ch < s->channels; ch++)
    2025           9 :         av_freep(&s->planar_samples[ch]);
    2026           6 :     av_freep(&s->planar_samples);
    2027           6 :     av_freep(&s->bap_buffer);
    2028           6 :     av_freep(&s->bap1_buffer);
    2029           6 :     av_freep(&s->mdct_coef_buffer);
    2030           6 :     av_freep(&s->fixed_coef_buffer);
    2031           6 :     av_freep(&s->exp_buffer);
    2032           6 :     av_freep(&s->grouped_exp_buffer);
    2033           6 :     av_freep(&s->psd_buffer);
    2034           6 :     av_freep(&s->band_psd_buffer);
    2035           6 :     av_freep(&s->mask_buffer);
    2036           6 :     av_freep(&s->qmant_buffer);
    2037           6 :     av_freep(&s->cpl_coord_exp_buffer);
    2038           6 :     av_freep(&s->cpl_coord_mant_buffer);
    2039           6 :     av_freep(&s->fdsp);
    2040          42 :     for (blk = 0; blk < s->num_blocks; blk++) {
    2041          36 :         AC3Block *block = &s->blocks[blk];
    2042          36 :         av_freep(&block->mdct_coef);
    2043          36 :         av_freep(&block->fixed_coef);
    2044          36 :         av_freep(&block->exp);
    2045          36 :         av_freep(&block->grouped_exp);
    2046          36 :         av_freep(&block->psd);
    2047          36 :         av_freep(&block->band_psd);
    2048          36 :         av_freep(&block->mask);
    2049          36 :         av_freep(&block->qmant);
    2050          36 :         av_freep(&block->cpl_coord_exp);
    2051          36 :         av_freep(&block->cpl_coord_mant);
    2052             :     }
    2053             : 
    2054           6 :     s->mdct_end(s);
    2055             : 
    2056           6 :     return 0;
    2057             : }
    2058             : 
    2059             : 
    2060             : /*
    2061             :  * Set channel information during initialization.
    2062             :  */
    2063           6 : static av_cold int set_channel_info(AC3EncodeContext *s, int channels,
    2064             :                                     uint64_t *channel_layout)
    2065             : {
    2066             :     int ch_layout;
    2067             : 
    2068           6 :     if (channels < 1 || channels > AC3_MAX_CHANNELS)
    2069           0 :         return AVERROR(EINVAL);
    2070           6 :     if (*channel_layout > 0x7FF)
    2071           0 :         return AVERROR(EINVAL);
    2072           6 :     ch_layout = *channel_layout;
    2073           6 :     if (!ch_layout)
    2074           0 :         ch_layout = av_get_default_channel_layout(channels);
    2075             : 
    2076           6 :     s->lfe_on       = !!(ch_layout & AV_CH_LOW_FREQUENCY);
    2077           6 :     s->channels     = channels;
    2078           6 :     s->fbw_channels = channels - s->lfe_on;
    2079           6 :     s->lfe_channel  = s->lfe_on ? s->fbw_channels + 1 : -1;
    2080           6 :     if (s->lfe_on)
    2081           0 :         ch_layout -= AV_CH_LOW_FREQUENCY;
    2082             : 
    2083           6 :     switch (ch_layout) {
    2084           3 :     case AV_CH_LAYOUT_MONO:           s->channel_mode = AC3_CHMODE_MONO;   break;
    2085           3 :     case AV_CH_LAYOUT_STEREO:         s->channel_mode = AC3_CHMODE_STEREO; break;
    2086           0 :     case AV_CH_LAYOUT_SURROUND:       s->channel_mode = AC3_CHMODE_3F;     break;
    2087           0 :     case AV_CH_LAYOUT_2_1:            s->channel_mode = AC3_CHMODE_2F1R;   break;
    2088           0 :     case AV_CH_LAYOUT_4POINT0:        s->channel_mode = AC3_CHMODE_3F1R;   break;
    2089           0 :     case AV_CH_LAYOUT_QUAD:
    2090           0 :     case AV_CH_LAYOUT_2_2:            s->channel_mode = AC3_CHMODE_2F2R;   break;
    2091           0 :     case AV_CH_LAYOUT_5POINT0:
    2092           0 :     case AV_CH_LAYOUT_5POINT0_BACK:   s->channel_mode = AC3_CHMODE_3F2R;   break;
    2093           0 :     default:
    2094           0 :         return AVERROR(EINVAL);
    2095             :     }
    2096           6 :     s->has_center   = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO;
    2097           6 :     s->has_surround =  s->channel_mode & 0x04;
    2098             : 
    2099           6 :     s->channel_map  = ff_ac3_enc_channel_map[s->channel_mode][s->lfe_on];
    2100           6 :     *channel_layout = ch_layout;
    2101           6 :     if (s->lfe_on)
    2102           0 :         *channel_layout |= AV_CH_LOW_FREQUENCY;
    2103             : 
    2104           6 :     return 0;
    2105             : }
    2106             : 
    2107             : 
    2108           6 : static av_cold int validate_options(AC3EncodeContext *s)
    2109             : {
    2110           6 :     AVCodecContext *avctx = s->avctx;
    2111             :     int i, ret, max_sr;
    2112             : 
    2113             :     /* validate channel layout */
    2114           6 :     if (!avctx->channel_layout) {
    2115           0 :         av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The "
    2116             :                                       "encoder will guess the layout, but it "
    2117             :                                       "might be incorrect.\n");
    2118             :     }
    2119           6 :     ret = set_channel_info(s, avctx->channels, &avctx->channel_layout);
    2120           6 :     if (ret) {
    2121           0 :         av_log(avctx, AV_LOG_ERROR, "invalid channel layout\n");
    2122           0 :         return ret;
    2123             :     }
    2124             : 
    2125             :     /* validate sample rate */
    2126             :     /* note: max_sr could be changed from 2 to 5 for E-AC-3 once we find a
    2127             :              decoder that supports half sample rate so we can validate that
    2128             :              the generated files are correct. */
    2129           6 :     max_sr = s->eac3 ? 2 : 8;
    2130          12 :     for (i = 0; i <= max_sr; i++) {
    2131          12 :         if ((ff_ac3_sample_rate_tab[i % 3] >> (i / 3)) == avctx->sample_rate)
    2132           6 :             break;
    2133             :     }
    2134           6 :     if (i > max_sr) {
    2135           0 :         av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
    2136           0 :         return AVERROR(EINVAL);
    2137             :     }
    2138           6 :     s->sample_rate        = avctx->sample_rate;
    2139           6 :     s->bit_alloc.sr_shift = i / 3;
    2140           6 :     s->bit_alloc.sr_code  = i % 3;
    2141           6 :     s->bitstream_id       = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift;
    2142             : 
    2143             :     /* select a default bit rate if not set by the user */
    2144           6 :     if (!avctx->bit_rate) {
    2145           2 :         switch (s->fbw_channels) {
    2146           2 :         case 1: avctx->bit_rate =  96000; break;
    2147           0 :         case 2: avctx->bit_rate = 192000; break;
    2148           0 :         case 3: avctx->bit_rate = 320000; break;
    2149           0 :         case 4: avctx->bit_rate = 384000; break;
    2150           0 :         case 5: avctx->bit_rate = 448000; break;
    2151             :         }
    2152             :     }
    2153             : 
    2154             :     /* validate bit rate */
    2155           6 :     if (s->eac3) {
    2156             :         int max_br, min_br, wpf, min_br_code;
    2157             :         int num_blks_code, num_blocks, frame_samples;
    2158             :         long long min_br_dist;
    2159             : 
    2160             :         /* calculate min/max bitrate */
    2161             :         /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've
    2162             :                  found use either 6 blocks or 1 block, even though 2 or 3 blocks
    2163             :                  would work as far as the bit rate is concerned. */
    2164           1 :         for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) {
    2165           1 :             num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code];
    2166           1 :             frame_samples  = AC3_BLOCK_SIZE * num_blocks;
    2167           1 :             max_br = 2048 * s->sample_rate / frame_samples * 16;
    2168           1 :             min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16;
    2169           1 :             if (avctx->bit_rate <= max_br)
    2170           1 :                 break;
    2171             :         }
    2172           1 :         if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) {
    2173           0 :             av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d "
    2174             :                    "for this sample rate\n", min_br, max_br);
    2175           0 :             return AVERROR(EINVAL);
    2176             :         }
    2177           1 :         s->num_blks_code = num_blks_code;
    2178           1 :         s->num_blocks    = num_blocks;
    2179             : 
    2180             :         /* calculate words-per-frame for the selected bitrate */
    2181           1 :         wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate;
    2182             :         av_assert1(wpf > 0 && wpf <= 2048);
    2183             : 
    2184             :         /* find the closest AC-3 bitrate code to the selected bitrate.
    2185             :            this is needed for lookup tables for bandwidth and coupling
    2186             :            parameter selection */
    2187           1 :         min_br_code = -1;
    2188           1 :         min_br_dist = INT64_MAX;
    2189          20 :         for (i = 0; i < 19; i++) {
    2190          19 :             long long br_dist = llabs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate);
    2191          19 :             if (br_dist < min_br_dist) {
    2192           9 :                 min_br_dist = br_dist;
    2193           9 :                 min_br_code = i;
    2194             :             }
    2195             :         }
    2196             : 
    2197             :         /* make sure the minimum frame size is below the average frame size */
    2198           1 :         s->frame_size_code = min_br_code << 1;
    2199           2 :         while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate)
    2200           0 :             wpf--;
    2201           1 :         s->frame_size_min = 2 * wpf;
    2202             :     } else {
    2203           5 :         int best_br = 0, best_code = 0;
    2204           5 :         long long best_diff = INT64_MAX;
    2205          37 :         for (i = 0; i < 19; i++) {
    2206          37 :             int br   = (ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift) * 1000;
    2207          37 :             long long diff = llabs(br - avctx->bit_rate);
    2208          37 :             if (diff < best_diff) {
    2209          37 :                 best_br   = br;
    2210          37 :                 best_code = i;
    2211          37 :                 best_diff = diff;
    2212             :             }
    2213          37 :             if (!best_diff)
    2214           5 :                 break;
    2215             :         }
    2216           5 :         avctx->bit_rate    = best_br;
    2217           5 :         s->frame_size_code = best_code << 1;
    2218           5 :         s->frame_size_min  = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
    2219           5 :         s->num_blks_code   = 0x3;
    2220           5 :         s->num_blocks      = 6;
    2221             :     }
    2222           6 :     s->bit_rate   = avctx->bit_rate;
    2223           6 :     s->frame_size = s->frame_size_min;
    2224             : 
    2225             :     /* validate cutoff */
    2226           6 :     if (avctx->cutoff < 0) {
    2227           0 :         av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n");
    2228           0 :         return AVERROR(EINVAL);
    2229             :     }
    2230           6 :     s->cutoff = avctx->cutoff;
    2231           6 :     if (s->cutoff > (s->sample_rate >> 1))
    2232           0 :         s->cutoff = s->sample_rate >> 1;
    2233             : 
    2234           6 :     ret = ff_ac3_validate_metadata(s);
    2235           6 :     if (ret)
    2236           0 :         return ret;
    2237             : 
    2238          12 :     s->rematrixing_enabled = s->options.stereo_rematrixing &&
    2239           6 :                              (s->channel_mode == AC3_CHMODE_STEREO);
    2240             : 
    2241          12 :     s->cpl_enabled = s->options.channel_coupling &&
    2242           6 :                      s->channel_mode >= AC3_CHMODE_STEREO;
    2243             : 
    2244           6 :     return 0;
    2245             : }
    2246             : 
    2247             : 
    2248             : /*
    2249             :  * Set bandwidth for all channels.
    2250             :  * The user can optionally supply a cutoff frequency. Otherwise an appropriate
    2251             :  * default value will be used.
    2252             :  */
    2253           6 : static av_cold void set_bandwidth(AC3EncodeContext *s)
    2254             : {
    2255           6 :     int blk, ch, av_uninit(cpl_start);
    2256             : 
    2257           6 :     if (s->cutoff) {
    2258             :         /* calculate bandwidth based on user-specified cutoff frequency */
    2259             :         int fbw_coeffs;
    2260           0 :         fbw_coeffs     = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate;
    2261           0 :         s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
    2262             :     } else {
    2263             :         /* use default bandwidth setting */
    2264           6 :         s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
    2265             :     }
    2266             : 
    2267             :     /* set number of coefficients for each channel */
    2268          15 :     for (ch = 1; ch <= s->fbw_channels; ch++) {
    2269           9 :         s->start_freq[ch] = 0;
    2270          63 :         for (blk = 0; blk < s->num_blocks; blk++)
    2271          54 :             s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73;
    2272             :     }
    2273             :     /* LFE channel always has 7 coefs */
    2274           6 :     if (s->lfe_on) {
    2275           0 :         s->start_freq[s->lfe_channel] = 0;
    2276           0 :         for (blk = 0; blk < s->num_blocks; blk++)
    2277           0 :             s->blocks[blk].end_freq[ch] = 7;
    2278             :     }
    2279             : 
    2280             :     /* initialize coupling strategy */
    2281           6 :     if (s->cpl_enabled) {
    2282           3 :         if (s->options.cpl_start != AC3ENC_OPT_AUTO) {
    2283           0 :             cpl_start = s->options.cpl_start;
    2284             :         } else {
    2285           3 :             cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2];
    2286           3 :             if (cpl_start < 0) {
    2287           0 :                 if (s->options.channel_coupling == AC3ENC_OPT_AUTO)
    2288           0 :                     s->cpl_enabled = 0;
    2289             :                 else
    2290           0 :                     cpl_start = 15;
    2291             :             }
    2292             :         }
    2293             :     }
    2294           6 :     if (s->cpl_enabled) {
    2295             :         int i, cpl_start_band, cpl_end_band;
    2296           3 :         uint8_t *cpl_band_sizes = s->cpl_band_sizes;
    2297             : 
    2298           3 :         cpl_end_band   = s->bandwidth_code / 4 + 3;
    2299           3 :         cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15));
    2300             : 
    2301           3 :         s->num_cpl_subbands = cpl_end_band - cpl_start_band;
    2302             : 
    2303           3 :         s->num_cpl_bands = 1;
    2304           3 :         *cpl_band_sizes  = 12;
    2305          15 :         for (i = cpl_start_band + 1; i < cpl_end_band; i++) {
    2306          12 :             if (ff_eac3_default_cpl_band_struct[i]) {
    2307           3 :                 *cpl_band_sizes += 12;
    2308             :             } else {
    2309           9 :                 s->num_cpl_bands++;
    2310           9 :                 cpl_band_sizes++;
    2311           9 :                 *cpl_band_sizes = 12;
    2312             :             }
    2313             :         }
    2314             : 
    2315           3 :         s->start_freq[CPL_CH] = cpl_start_band * 12 + 37;
    2316           3 :         s->cpl_end_freq       = cpl_end_band   * 12 + 37;
    2317          21 :         for (blk = 0; blk < s->num_blocks; blk++)
    2318          18 :             s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq;
    2319             :     }
    2320           6 : }
    2321             : 
    2322             : 
    2323           6 : static av_cold int allocate_buffers(AC3EncodeContext *s)
    2324             : {
    2325           6 :     AVCodecContext *avctx = s->avctx;
    2326             :     int blk, ch;
    2327           6 :     int channels = s->channels + 1; /* includes coupling channel */
    2328           6 :     int channel_blocks = channels * s->num_blocks;
    2329           6 :     int total_coefs    = AC3_MAX_COEFS * channel_blocks;
    2330             : 
    2331           6 :     if (s->allocate_sample_buffers(s))
    2332           0 :         goto alloc_fail;
    2333             : 
    2334           6 :     FF_ALLOC_ARRAY_OR_GOTO(avctx, s->bap_buffer, total_coefs,
    2335             :                      sizeof(*s->bap_buffer), alloc_fail);
    2336           6 :     FF_ALLOC_ARRAY_OR_GOTO(avctx, s->bap1_buffer, total_coefs,
    2337             :                      sizeof(*s->bap1_buffer), alloc_fail);
    2338           6 :     FF_ALLOCZ_ARRAY_OR_GOTO(avctx, s->mdct_coef_buffer, total_coefs,
    2339             :                       sizeof(*s->mdct_coef_buffer), alloc_fail);
    2340           6 :     FF_ALLOC_ARRAY_OR_GOTO(avctx, s->exp_buffer, total_coefs,
    2341             :                      sizeof(*s->exp_buffer), alloc_fail);
    2342           6 :     FF_ALLOC_ARRAY_OR_GOTO(avctx, s->grouped_exp_buffer, channel_blocks, 128 *
    2343             :                      sizeof(*s->grouped_exp_buffer), alloc_fail);
    2344           6 :     FF_ALLOC_ARRAY_OR_GOTO(avctx, s->psd_buffer, total_coefs,
    2345             :                      sizeof(*s->psd_buffer), alloc_fail);
    2346           6 :     FF_ALLOC_ARRAY_OR_GOTO(avctx, s->band_psd_buffer, channel_blocks, 64 *
    2347             :                      sizeof(*s->band_psd_buffer), alloc_fail);
    2348           6 :     FF_ALLOC_ARRAY_OR_GOTO(avctx, s->mask_buffer, channel_blocks, 64 *
    2349             :                      sizeof(*s->mask_buffer), alloc_fail);
    2350           6 :     FF_ALLOC_ARRAY_OR_GOTO(avctx, s->qmant_buffer, total_coefs,
    2351             :                      sizeof(*s->qmant_buffer), alloc_fail);
    2352           6 :     if (s->cpl_enabled) {
    2353           3 :         FF_ALLOC_ARRAY_OR_GOTO(avctx, s->cpl_coord_exp_buffer, channel_blocks, 16 *
    2354             :                          sizeof(*s->cpl_coord_exp_buffer), alloc_fail);
    2355           3 :         FF_ALLOC_ARRAY_OR_GOTO(avctx, s->cpl_coord_mant_buffer, channel_blocks, 16 *
    2356             :                          sizeof(*s->cpl_coord_mant_buffer), alloc_fail);
    2357             :     }
    2358          42 :     for (blk = 0; blk < s->num_blocks; blk++) {
    2359          36 :         AC3Block *block = &s->blocks[blk];
    2360          36 :         FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->mdct_coef, channels, sizeof(*block->mdct_coef),
    2361             :                           alloc_fail);
    2362          36 :         FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->exp, channels, sizeof(*block->exp),
    2363             :                           alloc_fail);
    2364          36 :         FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->grouped_exp, channels, sizeof(*block->grouped_exp),
    2365             :                           alloc_fail);
    2366          36 :         FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->psd, channels, sizeof(*block->psd),
    2367             :                           alloc_fail);
    2368          36 :         FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->band_psd, channels, sizeof(*block->band_psd),
    2369             :                           alloc_fail);
    2370          36 :         FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->mask, channels, sizeof(*block->mask),
    2371             :                           alloc_fail);
    2372          36 :         FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->qmant, channels, sizeof(*block->qmant),
    2373             :                           alloc_fail);
    2374          36 :         if (s->cpl_enabled) {
    2375          18 :             FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->cpl_coord_exp, channels, sizeof(*block->cpl_coord_exp),
    2376             :                               alloc_fail);
    2377          18 :             FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->cpl_coord_mant, channels, sizeof(*block->cpl_coord_mant),
    2378             :                               alloc_fail);
    2379             :         }
    2380             : 
    2381         126 :         for (ch = 0; ch < channels; ch++) {
    2382             :             /* arrangement: block, channel, coeff */
    2383          90 :             block->grouped_exp[ch] = &s->grouped_exp_buffer[128           * (blk * channels + ch)];
    2384          90 :             block->psd[ch]         = &s->psd_buffer        [AC3_MAX_COEFS * (blk * channels + ch)];
    2385          90 :             block->band_psd[ch]    = &s->band_psd_buffer   [64            * (blk * channels + ch)];
    2386          90 :             block->mask[ch]        = &s->mask_buffer       [64            * (blk * channels + ch)];
    2387          90 :             block->qmant[ch]       = &s->qmant_buffer      [AC3_MAX_COEFS * (blk * channels + ch)];
    2388          90 :             if (s->cpl_enabled) {
    2389          54 :                 block->cpl_coord_exp[ch]  = &s->cpl_coord_exp_buffer [16  * (blk * channels + ch)];
    2390          54 :                 block->cpl_coord_mant[ch] = &s->cpl_coord_mant_buffer[16  * (blk * channels + ch)];
    2391             :             }
    2392             : 
    2393             :             /* arrangement: channel, block, coeff */
    2394          90 :             block->exp[ch]         = &s->exp_buffer        [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
    2395          90 :             block->mdct_coef[ch]   = &s->mdct_coef_buffer  [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
    2396             :         }
    2397             :     }
    2398             : 
    2399           6 :     if (!s->fixed_point) {
    2400           2 :         FF_ALLOCZ_ARRAY_OR_GOTO(avctx, s->fixed_coef_buffer, total_coefs,
    2401             :                           sizeof(*s->fixed_coef_buffer), alloc_fail);
    2402          14 :         for (blk = 0; blk < s->num_blocks; blk++) {
    2403          12 :             AC3Block *block = &s->blocks[blk];
    2404          12 :             FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->fixed_coef, channels,
    2405             :                               sizeof(*block->fixed_coef), alloc_fail);
    2406          48 :             for (ch = 0; ch < channels; ch++)
    2407          36 :                 block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
    2408             :         }
    2409             :     } else {
    2410          28 :         for (blk = 0; blk < s->num_blocks; blk++) {
    2411          24 :             AC3Block *block = &s->blocks[blk];
    2412          24 :             FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->fixed_coef, channels,
    2413             :                               sizeof(*block->fixed_coef), alloc_fail);
    2414          78 :             for (ch = 0; ch < channels; ch++)
    2415          54 :                 block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch];
    2416             :         }
    2417             :     }
    2418             : 
    2419           6 :     return 0;
    2420           0 : alloc_fail:
    2421           0 :     return AVERROR(ENOMEM);
    2422             : }
    2423             : 
    2424             : 
    2425           6 : av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
    2426             : {
    2427           6 :     AC3EncodeContext *s = avctx->priv_data;
    2428             :     int ret, frame_size_58;
    2429             : 
    2430           6 :     s->avctx = avctx;
    2431             : 
    2432           6 :     s->eac3 = avctx->codec_id == AV_CODEC_ID_EAC3;
    2433             : 
    2434           6 :     ret = validate_options(s);
    2435           6 :     if (ret)
    2436           0 :         return ret;
    2437             : 
    2438           6 :     avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks;
    2439           6 :     avctx->initial_padding = AC3_BLOCK_SIZE;
    2440             : 
    2441           6 :     s->bitstream_mode = avctx->audio_service_type;
    2442           6 :     if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE)
    2443           0 :         s->bitstream_mode = 0x7;
    2444             : 
    2445           6 :     s->bits_written    = 0;
    2446           6 :     s->samples_written = 0;
    2447             : 
    2448             :     /* calculate crc_inv for both possible frame sizes */
    2449           6 :     frame_size_58 = (( s->frame_size    >> 2) + ( s->frame_size    >> 4)) << 1;
    2450           6 :     s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
    2451           6 :     if (s->bit_alloc.sr_code == 1) {
    2452           6 :         frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1;
    2453           6 :         s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
    2454             :     }
    2455             : 
    2456             :     /* set function pointers */
    2457           6 :     if (CONFIG_AC3_FIXED_ENCODER && s->fixed_point) {
    2458           4 :         s->mdct_end                     = ff_ac3_fixed_mdct_end;
    2459           4 :         s->mdct_init                    = ff_ac3_fixed_mdct_init;
    2460           4 :         s->allocate_sample_buffers      = ff_ac3_fixed_allocate_sample_buffers;
    2461             :     } else if (CONFIG_AC3_ENCODER || CONFIG_EAC3_ENCODER) {
    2462           2 :         s->mdct_end                     = ff_ac3_float_mdct_end;
    2463           2 :         s->mdct_init                    = ff_ac3_float_mdct_init;
    2464           2 :         s->allocate_sample_buffers      = ff_ac3_float_allocate_sample_buffers;
    2465             :     }
    2466           6 :     if (CONFIG_EAC3_ENCODER && s->eac3)
    2467           1 :         s->output_frame_header = ff_eac3_output_frame_header;
    2468             :     else
    2469           5 :         s->output_frame_header = ac3_output_frame_header;
    2470             : 
    2471           6 :     set_bandwidth(s);
    2472             : 
    2473           6 :     exponent_init(s);
    2474             : 
    2475           6 :     bit_alloc_init(s);
    2476             : 
    2477           6 :     ret = s->mdct_init(s);
    2478           6 :     if (ret)
    2479           0 :         goto init_fail;
    2480             : 
    2481           6 :     ret = allocate_buffers(s);
    2482           6 :     if (ret)
    2483           0 :         goto init_fail;
    2484             : 
    2485           6 :     ff_audiodsp_init(&s->adsp);
    2486           6 :     ff_me_cmp_init(&s->mecc, avctx);
    2487           6 :     ff_ac3dsp_init(&s->ac3dsp, avctx->flags & AV_CODEC_FLAG_BITEXACT);
    2488             : 
    2489           6 :     dprint_options(s);
    2490             : 
    2491           6 :     return 0;
    2492           0 : init_fail:
    2493           0 :     ff_ac3_encode_close(avctx);
    2494           0 :     return ret;
    2495             : }

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