LCOV - code coverage report
Current view: top level - libavcodec - takdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 353 529 66.7 %
Date: 2017-12-14 19:11:59 Functions: 12 14 85.7 %

          Line data    Source code
       1             : /*
       2             :  * TAK decoder
       3             :  * Copyright (c) 2012 Paul B Mahol
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * TAK (Tom's lossless Audio Kompressor) decoder
      25             :  * @author Paul B Mahol
      26             :  */
      27             : 
      28             : #include "libavutil/internal.h"
      29             : #include "libavutil/samplefmt.h"
      30             : 
      31             : #define BITSTREAM_READER_LE
      32             : #include "audiodsp.h"
      33             : #include "thread.h"
      34             : #include "avcodec.h"
      35             : #include "internal.h"
      36             : #include "unary.h"
      37             : #include "tak.h"
      38             : #include "takdsp.h"
      39             : 
      40             : #define MAX_SUBFRAMES     8                         ///< max number of subframes per channel
      41             : #define MAX_PREDICTORS  256
      42             : 
      43             : typedef struct MCDParam {
      44             :     int8_t present;                                 ///< decorrelation parameter availability for this channel
      45             :     int8_t index;                                   ///< index into array of decorrelation types
      46             :     int8_t chan1;
      47             :     int8_t chan2;
      48             : } MCDParam;
      49             : 
      50             : typedef struct TAKDecContext {
      51             :     AVCodecContext *avctx;                          ///< parent AVCodecContext
      52             :     AudioDSPContext adsp;
      53             :     TAKDSPContext   tdsp;
      54             :     TAKStreamInfo   ti;
      55             :     GetBitContext   gb;                             ///< bitstream reader initialized to start at the current frame
      56             : 
      57             :     int             uval;
      58             :     int             nb_samples;                     ///< number of samples in the current frame
      59             :     uint8_t        *decode_buffer;
      60             :     unsigned int    decode_buffer_size;
      61             :     int32_t        *decoded[TAK_MAX_CHANNELS];      ///< decoded samples for each channel
      62             : 
      63             :     int8_t          lpc_mode[TAK_MAX_CHANNELS];
      64             :     int8_t          sample_shift[TAK_MAX_CHANNELS]; ///< shift applied to every sample in the channel
      65             :     int16_t         predictors[MAX_PREDICTORS];
      66             :     int             nb_subframes;                   ///< number of subframes in the current frame
      67             :     int16_t         subframe_len[MAX_SUBFRAMES];    ///< subframe length in samples
      68             :     int             subframe_scale;
      69             : 
      70             :     int8_t          dmode;                          ///< channel decorrelation type in the current frame
      71             : 
      72             :     MCDParam        mcdparams[TAK_MAX_CHANNELS];    ///< multichannel decorrelation parameters
      73             : 
      74             :     int8_t          coding_mode[128];
      75             :     DECLARE_ALIGNED(16, int16_t, filter)[MAX_PREDICTORS];
      76             :     DECLARE_ALIGNED(16, int16_t, residues)[544];
      77             : } TAKDecContext;
      78             : 
      79             : static const int8_t mc_dmodes[] = { 1, 3, 4, 6, };
      80             : 
      81             : static const uint16_t predictor_sizes[] = {
      82             :     4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
      83             : };
      84             : 
      85             : static const struct CParam {
      86             :     int init;
      87             :     int escape;
      88             :     int scale;
      89             :     int aescape;
      90             :     int bias;
      91             : } xcodes[50] = {
      92             :     { 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 },
      93             :     { 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 },
      94             :     { 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D },
      95             :     { 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 },
      96             :     { 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 },
      97             :     { 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 },
      98             :     { 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 },
      99             :     { 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 },
     100             :     { 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 },
     101             :     { 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 },
     102             :     { 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 },
     103             :     { 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 },
     104             :     { 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 },
     105             :     { 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 },
     106             :     { 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 },
     107             :     { 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 },
     108             :     { 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 },
     109             :     { 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 },
     110             :     { 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 },
     111             :     { 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 },
     112             :     { 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 },
     113             :     { 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 },
     114             :     { 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 },
     115             :     { 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 },
     116             :     { 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 },
     117             :     { 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 },
     118             :     { 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 },
     119             :     { 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 },
     120             :     { 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 },
     121             :     { 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 },
     122             :     { 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 },
     123             :     { 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 },
     124             :     { 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 },
     125             :     { 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 },
     126             :     { 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 },
     127             :     { 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 },
     128             :     { 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 },
     129             :     { 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 },
     130             :     { 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 },
     131             :     { 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 },
     132             :     { 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 },
     133             :     { 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 },
     134             :     { 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 },
     135             :     { 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 },
     136             :     { 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 },
     137             :     { 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 },
     138             :     { 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 },
     139             :     { 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 },
     140             :     { 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 },
     141             :     { 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 },
     142             : };
     143             : 
     144          40 : static int set_bps_params(AVCodecContext *avctx)
     145             : {
     146          40 :     switch (avctx->bits_per_raw_sample) {
     147           0 :     case 8:
     148           0 :         avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
     149           0 :         break;
     150          40 :     case 16:
     151          40 :         avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
     152          40 :         break;
     153           0 :     case 24:
     154           0 :         avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
     155           0 :         break;
     156           0 :     default:
     157           0 :         av_log(avctx, AV_LOG_ERROR, "invalid/unsupported bits per sample: %d\n",
     158             :                avctx->bits_per_raw_sample);
     159           0 :         return AVERROR_INVALIDDATA;
     160             :     }
     161             : 
     162          40 :     return 0;
     163             : }
     164             : 
     165           2 : static void set_sample_rate_params(AVCodecContext *avctx)
     166             : {
     167           2 :     TAKDecContext *s  = avctx->priv_data;
     168             :     int shift;
     169             : 
     170           2 :     if (avctx->sample_rate < 11025) {
     171           0 :         shift = 3;
     172           2 :     } else if (avctx->sample_rate < 22050) {
     173           0 :         shift = 2;
     174           2 :     } else if (avctx->sample_rate < 44100) {
     175           0 :         shift = 1;
     176             :     } else {
     177           2 :         shift = 0;
     178             :     }
     179           2 :     s->uval           = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << shift;
     180           2 :     s->subframe_scale = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << 1;
     181           2 : }
     182             : 
     183           2 : static av_cold int tak_decode_init(AVCodecContext *avctx)
     184             : {
     185           2 :     TAKDecContext *s = avctx->priv_data;
     186             : 
     187           2 :     ff_audiodsp_init(&s->adsp);
     188           2 :     ff_takdsp_init(&s->tdsp);
     189             : 
     190           2 :     s->avctx = avctx;
     191           2 :     avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
     192             : 
     193           2 :     set_sample_rate_params(avctx);
     194             : 
     195           2 :     return set_bps_params(avctx);
     196             : }
     197             : 
     198         122 : static void decode_lpc(int32_t *coeffs, int mode, int length)
     199             : {
     200             :     int i;
     201             : 
     202         122 :     if (length < 2)
     203           0 :         return;
     204             : 
     205         122 :     if (mode == 1) {
     206         115 :         unsigned a1 = *coeffs++;
     207      420150 :         for (i = 0; i < length - 1 >> 1; i++) {
     208      420035 :             *coeffs   += a1;
     209      420035 :             coeffs[1] += (unsigned)*coeffs;
     210      420035 :             a1         = coeffs[1];
     211      420035 :             coeffs    += 2;
     212             :         }
     213         115 :         if (length - 1 & 1)
     214          39 :             *coeffs += a1;
     215           7 :     } else if (mode == 2) {
     216           7 :         unsigned a1    = coeffs[1];
     217           7 :         unsigned a2    = a1 + *coeffs;
     218           7 :         coeffs[1] = a2;
     219           7 :         if (length > 2) {
     220           7 :             coeffs += 2;
     221         258 :             for (i = 0; i < length - 2 >> 1; i++) {
     222         251 :                 unsigned a3    = *coeffs + a1;
     223         251 :                 unsigned a4    = a3 + a2;
     224         251 :                 *coeffs   = a4;
     225         251 :                 a1        = coeffs[1] + a3;
     226         251 :                 a2        = a1 + a4;
     227         251 :                 coeffs[1] = a2;
     228         251 :                 coeffs   += 2;
     229             :             }
     230           7 :             if (length & 1)
     231           0 :                 *coeffs += a1 + a2;
     232             :         }
     233           0 :     } else if (mode == 3) {
     234           0 :         unsigned a1    = coeffs[1];
     235           0 :         unsigned a2    = a1 + *coeffs;
     236           0 :         coeffs[1] = a2;
     237           0 :         if (length > 2) {
     238           0 :             unsigned a3  = coeffs[2];
     239           0 :             unsigned a4  = a3 + a1;
     240           0 :             unsigned a5  = a4 + a2;
     241           0 :             coeffs[2] = a5;
     242           0 :             coeffs += 3;
     243           0 :             for (i = 0; i < length - 3; i++) {
     244           0 :                 a3     += *coeffs;
     245           0 :                 a4     += a3;
     246           0 :                 a5     += a4;
     247           0 :                 *coeffs = a5;
     248           0 :                 coeffs++;
     249             :             }
     250             :         }
     251             :     }
     252             : }
     253             : 
     254        3930 : static int decode_segment(TAKDecContext *s, int8_t mode, int32_t *decoded, int len)
     255             : {
     256             :     struct CParam code;
     257        3930 :     GetBitContext *gb = &s->gb;
     258             :     int i;
     259             : 
     260        3930 :     if (!mode) {
     261           0 :         memset(decoded, 0, len * sizeof(*decoded));
     262           0 :         return 0;
     263             :     }
     264             : 
     265        3930 :     if (mode > FF_ARRAY_ELEMS(xcodes))
     266           0 :         return AVERROR_INVALIDDATA;
     267        3930 :     code = xcodes[mode - 1];
     268             : 
     269      841754 :     for (i = 0; i < len; i++) {
     270      837824 :         unsigned x = get_bits_long(gb, code.init);
     271      837824 :         if (x >= code.escape && get_bits1(gb)) {
     272      182416 :             x |= 1 << code.init;
     273      182416 :             if (x >= code.aescape) {
     274      135064 :                 unsigned scale = get_unary(gb, 1, 9);
     275      135064 :                 if (scale == 9) {
     276         164 :                     int scale_bits = get_bits(gb, 3);
     277         164 :                     if (scale_bits > 0) {
     278         109 :                         if (scale_bits == 7) {
     279           0 :                             scale_bits += get_bits(gb, 5);
     280           0 :                             if (scale_bits > 29)
     281           0 :                                 return AVERROR_INVALIDDATA;
     282             :                         }
     283         109 :                         scale = get_bits_long(gb, scale_bits) + 1;
     284         109 :                         x    += code.scale * scale;
     285             :                     }
     286         164 :                     x += code.bias;
     287             :                 } else
     288      134900 :                     x += code.scale * scale - code.escape;
     289             :             } else
     290       47352 :                 x -= code.escape;
     291             :         }
     292      837824 :         decoded[i] = (x >> 1) ^ -(x & 1);
     293             :     }
     294             : 
     295        3930 :     return 0;
     296             : }
     297             : 
     298         341 : static int decode_residues(TAKDecContext *s, int32_t *decoded, int length)
     299             : {
     300         341 :     GetBitContext *gb = &s->gb;
     301             :     int i, mode, ret;
     302             : 
     303         341 :     if (length > s->nb_samples)
     304           0 :         return AVERROR_INVALIDDATA;
     305             : 
     306         341 :     if (get_bits1(gb)) {
     307             :         int wlength, rval;
     308             : 
     309         250 :         wlength = length / s->uval;
     310             : 
     311         250 :         rval = length - (wlength * s->uval);
     312             : 
     313         250 :         if (rval < s->uval / 2)
     314         209 :             rval += s->uval;
     315             :         else
     316          41 :             wlength++;
     317             : 
     318         250 :         if (wlength <= 1 || wlength > 128)
     319           0 :             return AVERROR_INVALIDDATA;
     320             : 
     321         250 :         s->coding_mode[0] = mode = get_bits(gb, 6);
     322             : 
     323        8926 :         for (i = 1; i < wlength; i++) {
     324        8676 :             int c = get_unary(gb, 1, 6);
     325             : 
     326        8676 :             switch (c) {
     327           0 :             case 6:
     328           0 :                 mode = get_bits(gb, 6);
     329           0 :                 break;
     330         238 :             case 5:
     331             :             case 4:
     332             :             case 3: {
     333             :                 /* mode += sign ? (1 - c) : (c - 1) */
     334         238 :                 int sign = get_bits1(gb);
     335         238 :                 mode    += (-sign ^ (c - 1)) + sign;
     336         238 :                 break;
     337             :             }
     338        1607 :             case 2:
     339        1607 :                 mode++;
     340        1607 :                 break;
     341        1744 :             case 1:
     342        1744 :                 mode--;
     343        1744 :                 break;
     344             :             }
     345        8676 :             s->coding_mode[i] = mode;
     346             :         }
     347             : 
     348         250 :         i = 0;
     349        4339 :         while (i < wlength) {
     350        3839 :             int len = 0;
     351             : 
     352        3839 :             mode = s->coding_mode[i];
     353             :             do {
     354        8926 :                 if (i >= wlength - 1)
     355         250 :                     len += rval;
     356             :                 else
     357        8676 :                     len += s->uval;
     358        8926 :                 i++;
     359             : 
     360        8926 :                 if (i == wlength)
     361         250 :                     break;
     362        8676 :             } while (s->coding_mode[i] == mode);
     363             : 
     364        3839 :             if ((ret = decode_segment(s, mode, decoded, len)) < 0)
     365           0 :                 return ret;
     366        3839 :             decoded += len;
     367             :         }
     368             :     } else {
     369          91 :         mode = get_bits(gb, 6);
     370          91 :         if ((ret = decode_segment(s, mode, decoded, length)) < 0)
     371           0 :             return ret;
     372             :     }
     373             : 
     374         341 :     return 0;
     375             : }
     376             : 
     377         376 : static int get_bits_esc4(GetBitContext *gb)
     378             : {
     379         376 :     if (get_bits1(gb))
     380          25 :         return get_bits(gb, 4) + 1;
     381             :     else
     382         351 :         return 0;
     383             : }
     384             : 
     385         265 : static int decode_subframe(TAKDecContext *s, int32_t *decoded,
     386             :                            int subframe_size, int prev_subframe_size)
     387             : {
     388         265 :     GetBitContext *gb = &s->gb;
     389         265 :     int x, y, i, j, ret = 0;
     390             :     int dshift, size, filter_quant, filter_order;
     391             :     int tfilter[MAX_PREDICTORS];
     392             : 
     393         265 :     if (!get_bits1(gb))
     394           0 :         return decode_residues(s, decoded, subframe_size);
     395             : 
     396         265 :     filter_order = predictor_sizes[get_bits(gb, 4)];
     397             : 
     398         265 :     if (prev_subframe_size > 0 && get_bits1(gb)) {
     399         189 :         if (filter_order > prev_subframe_size)
     400           0 :             return AVERROR_INVALIDDATA;
     401             : 
     402         189 :         decoded       -= filter_order;
     403         189 :         subframe_size += filter_order;
     404             : 
     405         378 :         if (filter_order > subframe_size)
     406           0 :             return AVERROR_INVALIDDATA;
     407             :     } else {
     408             :         int lpc_mode;
     409             : 
     410          76 :         if (filter_order > subframe_size)
     411           0 :             return AVERROR_INVALIDDATA;
     412             : 
     413          76 :         lpc_mode = get_bits(gb, 2);
     414          76 :         if (lpc_mode > 2)
     415           0 :             return AVERROR_INVALIDDATA;
     416             : 
     417          76 :         if ((ret = decode_residues(s, decoded, filter_order)) < 0)
     418           0 :             return ret;
     419             : 
     420          76 :         if (lpc_mode)
     421          46 :             decode_lpc(decoded, lpc_mode, filter_order);
     422             :     }
     423             : 
     424         265 :     dshift = get_bits_esc4(gb);
     425         265 :     size   = get_bits1(gb) + 6;
     426             : 
     427         265 :     filter_quant = 10;
     428         265 :     if (get_bits1(gb)) {
     429           0 :         filter_quant -= get_bits(gb, 3) + 1;
     430           0 :         if (filter_quant < 3)
     431           0 :             return AVERROR_INVALIDDATA;
     432             :     }
     433             : 
     434         265 :     s->predictors[0] = get_sbits(gb, 10);
     435         265 :     s->predictors[1] = get_sbits(gb, 10);
     436         265 :     s->predictors[2] = get_sbits(gb, size) * (1 << (10 - size));
     437         265 :     s->predictors[3] = get_sbits(gb, size) * (1 << (10 - size));
     438         265 :     if (filter_order > 4) {
     439         242 :         int tmp = size - get_bits1(gb);
     440             : 
     441        9054 :         for (i = 4; i < filter_order; i++) {
     442        8812 :             if (!(i & 3))
     443        2203 :                 x = tmp - get_bits(gb, 2);
     444        8812 :             s->predictors[i] = get_sbits(gb, x) * (1 << (10 - size));
     445             :         }
     446             :     }
     447             : 
     448         265 :     tfilter[0] = s->predictors[0] * 64;
     449        9872 :     for (i = 1; i < filter_order; i++) {
     450        9607 :         uint32_t *p1 = &tfilter[0];
     451        9607 :         uint32_t *p2 = &tfilter[i - 1];
     452             : 
     453      215679 :         for (j = 0; j < (i + 1) / 2; j++) {
     454      206072 :             x     = *p1 + ((int32_t)(s->predictors[i] * *p2 + 256) >> 9);
     455      206072 :             *p2  += (int32_t)(s->predictors[i] * *p1 + 256) >> 9;
     456      206072 :             *p1++ = x;
     457      206072 :             p2--;
     458             :         }
     459             : 
     460        9607 :         tfilter[i] = s->predictors[i] * 64;
     461             :     }
     462             : 
     463         265 :     x = 1 << (32 - (15 - filter_quant));
     464         265 :     y = 1 << ((15 - filter_quant) - 1);
     465        5201 :     for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) {
     466        4936 :         s->filter[j] = x - ((tfilter[i] + y) >> (15 - filter_quant));
     467        4936 :         s->filter[i] = x - ((tfilter[j] + y) >> (15 - filter_quant));
     468             :     }
     469             : 
     470         265 :     if ((ret = decode_residues(s, &decoded[filter_order],
     471             :                                subframe_size - filter_order)) < 0)
     472           0 :         return ret;
     473             : 
     474       10137 :     for (i = 0; i < filter_order; i++)
     475        9872 :         s->residues[i] = *decoded++ >> dshift;
     476             : 
     477         265 :     y    = FF_ARRAY_ELEMS(s->residues) - filter_order;
     478         265 :     x    = subframe_size - filter_order;
     479        2378 :     while (x > 0) {
     480        1848 :         int tmp = FFMIN(y, x);
     481             : 
     482      835784 :         for (i = 0; i < tmp; i++) {
     483      833936 :             int v = 1 << (filter_quant - 1);
     484             : 
     485      833936 :             if (filter_order & -16)
     486      685736 :                 v += (unsigned)s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
     487             :                                                  filter_order & -16);
     488     1303584 :             for (j = filter_order & -16; j < filter_order; j += 4) {
     489     1408944 :                 v += s->residues[i + j + 3] * (unsigned)s->filter[j + 3] +
     490      469648 :                      s->residues[i + j + 2] * (unsigned)s->filter[j + 2] +
     491      469648 :                      s->residues[i + j + 1] * (unsigned)s->filter[j + 1] +
     492      469648 :                      s->residues[i + j    ] * (unsigned)s->filter[j    ];
     493             :             }
     494      833936 :             v = (av_clip_intp2(v >> filter_quant, 13) * (1 << dshift)) - (unsigned)*decoded;
     495      833936 :             *decoded++ = v;
     496      833936 :             s->residues[filter_order + i] = v >> dshift;
     497             :         }
     498             : 
     499        1848 :         x -= tmp;
     500        1848 :         if (x > 0)
     501        1583 :             memcpy(s->residues, &s->residues[y], 2 * filter_order);
     502             :     }
     503             : 
     504         265 :     emms_c();
     505             : 
     506         265 :     return 0;
     507             : }
     508             : 
     509          76 : static int decode_channel(TAKDecContext *s, int chan)
     510             : {
     511          76 :     AVCodecContext *avctx = s->avctx;
     512          76 :     GetBitContext *gb     = &s->gb;
     513          76 :     int32_t *decoded      = s->decoded[chan];
     514          76 :     int left              = s->nb_samples - 1;
     515          76 :     int i = 0, ret, prev = 0;
     516             : 
     517          76 :     s->sample_shift[chan] = get_bits_esc4(gb);
     518          76 :     if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
     519           0 :         return AVERROR_INVALIDDATA;
     520             : 
     521          76 :     *decoded++ = get_sbits(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]);
     522          76 :     s->lpc_mode[chan] = get_bits(gb, 2);
     523          76 :     s->nb_subframes   = get_bits(gb, 3) + 1;
     524             : 
     525          76 :     if (s->nb_subframes > 1) {
     526          68 :         if (get_bits_left(gb) < (s->nb_subframes - 1) * 6)
     527           0 :             return AVERROR_INVALIDDATA;
     528             : 
     529         257 :         for (; i < s->nb_subframes - 1; i++) {
     530         189 :             int v = get_bits(gb, 6);
     531             : 
     532         189 :             s->subframe_len[i] = (v - prev) * s->subframe_scale;
     533         189 :             if (s->subframe_len[i] <= 0)
     534           0 :                 return AVERROR_INVALIDDATA;
     535             : 
     536         189 :             left -= s->subframe_len[i];
     537         189 :             prev  = v;
     538             :         }
     539             : 
     540          68 :         if (left <= 0)
     541           0 :             return AVERROR_INVALIDDATA;
     542             :     }
     543          76 :     s->subframe_len[i] = left;
     544             : 
     545          76 :     prev = 0;
     546         341 :     for (i = 0; i < s->nb_subframes; i++) {
     547         265 :         if ((ret = decode_subframe(s, decoded, s->subframe_len[i], prev)) < 0)
     548           0 :             return ret;
     549         265 :         decoded += s->subframe_len[i];
     550         265 :         prev     = s->subframe_len[i];
     551             :     }
     552             : 
     553          76 :     return 0;
     554             : }
     555             : 
     556          38 : static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
     557             : {
     558          38 :     GetBitContext *gb = &s->gb;
     559          38 :     int32_t *p1       = s->decoded[c1] + (s->dmode > 5);
     560          38 :     int32_t *p2       = s->decoded[c2] + (s->dmode > 5);
     561          38 :     int32_t bp1       = p1[0];
     562          38 :     int32_t bp2       = p2[0];
     563             :     int i;
     564             :     int dshift, dfactor;
     565             : 
     566          38 :     length += s->dmode < 6;
     567             : 
     568          38 :     switch (s->dmode) {
     569           1 :     case 1: /* left/side */
     570           1 :         s->tdsp.decorrelate_ls(p1, p2, length);
     571           1 :         break;
     572           0 :     case 2: /* side/right */
     573           0 :         s->tdsp.decorrelate_sr(p1, p2, length);
     574           0 :         break;
     575           2 :     case 3: /* side/mid */
     576           2 :         s->tdsp.decorrelate_sm(p1, p2, length);
     577           2 :         break;
     578           3 :     case 4: /* side/left with scale factor */
     579           3 :         FFSWAP(int32_t*, p1, p2);
     580           3 :         FFSWAP(int32_t, bp1, bp2);
     581           5 :     case 5: /* side/right with scale factor */
     582           5 :         dshift  = get_bits_esc4(gb);
     583           5 :         dfactor = get_sbits(gb, 10);
     584           5 :         s->tdsp.decorrelate_sf(p1, p2, length, dshift, dfactor);
     585           5 :         break;
     586          13 :     case 6:
     587          13 :         FFSWAP(int32_t*, p1, p2);
     588          30 :     case 7: {
     589             :         int length2, order_half, filter_order, dval1, dval2;
     590             :         int tmp, x, code_size;
     591             : 
     592          30 :         if (length < 256)
     593           0 :             return AVERROR_INVALIDDATA;
     594             : 
     595          30 :         dshift       = get_bits_esc4(gb);
     596          30 :         filter_order = 8 << get_bits1(gb);
     597          30 :         dval1        = get_bits1(gb);
     598          30 :         dval2        = get_bits1(gb);
     599             : 
     600         366 :         for (i = 0; i < filter_order; i++) {
     601         336 :             if (!(i & 3))
     602          84 :                 code_size = 14 - get_bits(gb, 3);
     603         336 :             s->filter[i] = get_sbits(gb, code_size);
     604             :         }
     605             : 
     606          30 :         order_half = filter_order / 2;
     607          30 :         length2    = length - (filter_order - 1);
     608             : 
     609             :         /* decorrelate beginning samples */
     610          30 :         if (dval1) {
     611         141 :             for (i = 0; i < order_half; i++) {
     612         120 :                 int32_t a = p1[i];
     613         120 :                 int32_t b = p2[i];
     614         120 :                 p1[i]     = a + b;
     615             :             }
     616             :         }
     617             : 
     618             :         /* decorrelate ending samples */
     619          30 :         if (dval2) {
     620          96 :             for (i = length2 + order_half; i < length; i++) {
     621          78 :                 int32_t a = p1[i];
     622          78 :                 int32_t b = p2[i];
     623          78 :                 p1[i]     = a + b;
     624             :             }
     625             :         }
     626             : 
     627             : 
     628         366 :         for (i = 0; i < filter_order; i++)
     629         336 :             s->residues[i] = *p2++ >> dshift;
     630             : 
     631          30 :         p1 += order_half;
     632          30 :         x = FF_ARRAY_ELEMS(s->residues) - filter_order;
     633         660 :         for (; length2 > 0; length2 -= tmp) {
     634         630 :             tmp = FFMIN(length2, x);
     635             : 
     636      331014 :             for (i = 0; i < tmp - (tmp == length2); i++)
     637      330384 :                 s->residues[filter_order + i] = *p2++ >> dshift;
     638             : 
     639      331044 :             for (i = 0; i < tmp; i++) {
     640      330414 :                 int v = 1 << 9;
     641             : 
     642      330414 :                 if (filter_order == 16) {
     643      132108 :                     v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
     644             :                                                      filter_order);
     645             :                 } else {
     646      594918 :                     v += s->residues[i + 7] * s->filter[7] +
     647      396612 :                          s->residues[i + 6] * s->filter[6] +
     648      396612 :                          s->residues[i + 5] * s->filter[5] +
     649      396612 :                          s->residues[i + 4] * s->filter[4] +
     650      396612 :                          s->residues[i + 3] * s->filter[3] +
     651      396612 :                          s->residues[i + 2] * s->filter[2] +
     652      396612 :                          s->residues[i + 1] * s->filter[1] +
     653      198306 :                          s->residues[i    ] * s->filter[0];
     654             :                 }
     655             : 
     656      330414 :                 v = av_clip_intp2(v >> 10, 13) * (1 << dshift) - *p1;
     657      330414 :                 *p1++ = v;
     658             :             }
     659             : 
     660         630 :             memmove(s->residues, &s->residues[tmp], 2 * filter_order);
     661             :         }
     662             : 
     663          30 :         emms_c();
     664          30 :         break;
     665             :     }
     666             :     }
     667             : 
     668          38 :     if (s->dmode > 0 && s->dmode < 6) {
     669           8 :         p1[0] = bp1;
     670           8 :         p2[0] = bp2;
     671             :     }
     672             : 
     673          38 :     return 0;
     674             : }
     675             : 
     676          38 : static int tak_decode_frame(AVCodecContext *avctx, void *data,
     677             :                             int *got_frame_ptr, AVPacket *pkt)
     678             : {
     679          38 :     TAKDecContext *s  = avctx->priv_data;
     680          38 :     AVFrame *frame    = data;
     681          38 :     ThreadFrame tframe = { .f = data };
     682          38 :     GetBitContext *gb = &s->gb;
     683             :     int chan, i, ret, hsize;
     684             : 
     685          38 :     if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
     686           0 :         return AVERROR_INVALIDDATA;
     687             : 
     688          38 :     if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
     689           0 :         return ret;
     690             : 
     691          38 :     if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
     692           0 :         return ret;
     693             : 
     694          38 :     hsize = get_bits_count(gb) / 8;
     695          38 :     if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_COMPLIANT)) {
     696           0 :         if (ff_tak_check_crc(pkt->data, hsize)) {
     697           0 :             av_log(avctx, AV_LOG_ERROR, "CRC error\n");
     698           0 :             if (avctx->err_recognition & AV_EF_EXPLODE)
     699           0 :                 return AVERROR_INVALIDDATA;
     700             :         }
     701             :     }
     702             : 
     703          38 :     if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
     704           0 :         s->ti.codec != TAK_CODEC_MULTICHANNEL) {
     705           0 :         avpriv_report_missing_feature(avctx, "TAK codec type %d", s->ti.codec);
     706           0 :         return AVERROR_PATCHWELCOME;
     707             :     }
     708          38 :     if (s->ti.data_type) {
     709           0 :         av_log(avctx, AV_LOG_ERROR,
     710             :                "unsupported data type: %d\n", s->ti.data_type);
     711           0 :         return AVERROR_INVALIDDATA;
     712             :     }
     713          38 :     if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
     714           0 :         av_log(avctx, AV_LOG_ERROR,
     715             :                "invalid number of channels: %d\n", s->ti.channels);
     716           0 :         return AVERROR_INVALIDDATA;
     717             :     }
     718          38 :     if (s->ti.channels > 6) {
     719           0 :         av_log(avctx, AV_LOG_ERROR,
     720             :                "unsupported number of channels: %d\n", s->ti.channels);
     721           0 :         return AVERROR_INVALIDDATA;
     722             :     }
     723             : 
     724          38 :     if (s->ti.frame_samples <= 0) {
     725           0 :         av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
     726           0 :         return AVERROR_INVALIDDATA;
     727             :     }
     728             : 
     729          38 :     avctx->bits_per_raw_sample = s->ti.bps;
     730          38 :     if ((ret = set_bps_params(avctx)) < 0)
     731           0 :         return ret;
     732          38 :     if (s->ti.sample_rate != avctx->sample_rate) {
     733           0 :         avctx->sample_rate = s->ti.sample_rate;
     734           0 :         set_sample_rate_params(avctx);
     735             :     }
     736          38 :     if (s->ti.ch_layout)
     737           0 :         avctx->channel_layout = s->ti.ch_layout;
     738          38 :     avctx->channels = s->ti.channels;
     739             : 
     740          76 :     s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples
     741          38 :                                              : s->ti.frame_samples;
     742             : 
     743          38 :     frame->nb_samples = s->nb_samples;
     744          38 :     if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
     745           0 :         return ret;
     746          38 :     ff_thread_finish_setup(avctx);
     747             : 
     748          38 :     if (avctx->bits_per_raw_sample <= 16) {
     749          38 :         int buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
     750             :                                                   s->nb_samples,
     751             :                                                   AV_SAMPLE_FMT_S32P, 0);
     752          38 :         if (buf_size < 0)
     753           0 :             return buf_size;
     754          38 :         av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
     755          38 :         if (!s->decode_buffer)
     756           0 :             return AVERROR(ENOMEM);
     757          76 :         ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
     758          38 :                                      s->decode_buffer, avctx->channels,
     759             :                                      s->nb_samples, AV_SAMPLE_FMT_S32P, 0);
     760          38 :         if (ret < 0)
     761           0 :             return ret;
     762             :     } else {
     763           0 :         for (chan = 0; chan < avctx->channels; chan++)
     764           0 :             s->decoded[chan] = (int32_t *)frame->extended_data[chan];
     765             :     }
     766             : 
     767          38 :     if (s->nb_samples < 16) {
     768           0 :         for (chan = 0; chan < avctx->channels; chan++) {
     769           0 :             int32_t *decoded = s->decoded[chan];
     770           0 :             for (i = 0; i < s->nb_samples; i++)
     771           0 :                 decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample);
     772             :         }
     773             :     } else {
     774          38 :         if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
     775         114 :             for (chan = 0; chan < avctx->channels; chan++)
     776          76 :                 if (ret = decode_channel(s, chan))
     777           0 :                     return ret;
     778             : 
     779          38 :             if (avctx->channels == 2) {
     780          38 :                 s->nb_subframes = get_bits(gb, 1) + 1;
     781          38 :                 if (s->nb_subframes > 1) {
     782           0 :                     s->subframe_len[1] = get_bits(gb, 6);
     783             :                 }
     784             : 
     785          38 :                 s->dmode = get_bits(gb, 3);
     786          38 :                 if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
     787           0 :                     return ret;
     788             :             }
     789           0 :         } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
     790           0 :             if (get_bits1(gb)) {
     791           0 :                 int ch_mask = 0;
     792             : 
     793           0 :                 chan = get_bits(gb, 4) + 1;
     794           0 :                 if (chan > avctx->channels)
     795           0 :                     return AVERROR_INVALIDDATA;
     796             : 
     797           0 :                 for (i = 0; i < chan; i++) {
     798           0 :                     int nbit = get_bits(gb, 4);
     799             : 
     800           0 :                     if (nbit >= avctx->channels)
     801           0 :                         return AVERROR_INVALIDDATA;
     802             : 
     803           0 :                     if (ch_mask & 1 << nbit)
     804           0 :                         return AVERROR_INVALIDDATA;
     805             : 
     806           0 :                     s->mcdparams[i].present = get_bits1(gb);
     807           0 :                     if (s->mcdparams[i].present) {
     808           0 :                         s->mcdparams[i].index = get_bits(gb, 2);
     809           0 :                         s->mcdparams[i].chan2 = get_bits(gb, 4);
     810           0 :                         if (s->mcdparams[i].chan2 >= avctx->channels) {
     811           0 :                             av_log(avctx, AV_LOG_ERROR,
     812             :                                    "invalid channel 2 (%d) for %d channel(s)\n",
     813           0 :                                    s->mcdparams[i].chan2, avctx->channels);
     814           0 :                             return AVERROR_INVALIDDATA;
     815             :                         }
     816           0 :                         if (s->mcdparams[i].index == 1) {
     817           0 :                             if ((nbit == s->mcdparams[i].chan2) ||
     818           0 :                                 (ch_mask & 1 << s->mcdparams[i].chan2))
     819           0 :                                 return AVERROR_INVALIDDATA;
     820             : 
     821           0 :                             ch_mask |= 1 << s->mcdparams[i].chan2;
     822           0 :                         } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
     823           0 :                             return AVERROR_INVALIDDATA;
     824             :                         }
     825             :                     }
     826           0 :                     s->mcdparams[i].chan1 = nbit;
     827             : 
     828           0 :                     ch_mask |= 1 << nbit;
     829             :                 }
     830             :             } else {
     831           0 :                 chan = avctx->channels;
     832           0 :                 for (i = 0; i < chan; i++) {
     833           0 :                     s->mcdparams[i].present = 0;
     834           0 :                     s->mcdparams[i].chan1   = i;
     835             :                 }
     836             :             }
     837             : 
     838           0 :             for (i = 0; i < chan; i++) {
     839           0 :                 if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
     840           0 :                     if (ret = decode_channel(s, s->mcdparams[i].chan2))
     841           0 :                         return ret;
     842             : 
     843           0 :                 if (ret = decode_channel(s, s->mcdparams[i].chan1))
     844           0 :                     return ret;
     845             : 
     846           0 :                 if (s->mcdparams[i].present) {
     847           0 :                     s->dmode = mc_dmodes[s->mcdparams[i].index];
     848           0 :                     if (ret = decorrelate(s,
     849           0 :                                           s->mcdparams[i].chan2,
     850           0 :                                           s->mcdparams[i].chan1,
     851           0 :                                           s->nb_samples - 1))
     852           0 :                         return ret;
     853             :                 }
     854             :             }
     855             :         }
     856             : 
     857         114 :         for (chan = 0; chan < avctx->channels; chan++) {
     858          76 :             int32_t *decoded = s->decoded[chan];
     859             : 
     860          76 :             if (s->lpc_mode[chan])
     861          76 :                 decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
     862             : 
     863          76 :             if (s->sample_shift[chan] > 0)
     864           0 :                 for (i = 0; i < s->nb_samples; i++)
     865           0 :                     decoded[i] *= 1U << s->sample_shift[chan];
     866             :         }
     867             :     }
     868             : 
     869          38 :     align_get_bits(gb);
     870          38 :     skip_bits(gb, 24);
     871          38 :     if (get_bits_left(gb) < 0)
     872           0 :         av_log(avctx, AV_LOG_DEBUG, "overread\n");
     873          38 :     else if (get_bits_left(gb) > 0)
     874           0 :         av_log(avctx, AV_LOG_DEBUG, "underread\n");
     875             : 
     876          38 :     if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_COMPLIANT)) {
     877           0 :         if (ff_tak_check_crc(pkt->data + hsize,
     878           0 :                              get_bits_count(gb) / 8 - hsize)) {
     879           0 :             av_log(avctx, AV_LOG_ERROR, "CRC error\n");
     880           0 :             if (avctx->err_recognition & AV_EF_EXPLODE)
     881           0 :                 return AVERROR_INVALIDDATA;
     882             :         }
     883             :     }
     884             : 
     885             :     /* convert to output buffer */
     886          38 :     switch (avctx->sample_fmt) {
     887           0 :     case AV_SAMPLE_FMT_U8P:
     888           0 :         for (chan = 0; chan < avctx->channels; chan++) {
     889           0 :             uint8_t *samples = (uint8_t *)frame->extended_data[chan];
     890           0 :             int32_t *decoded = s->decoded[chan];
     891           0 :             for (i = 0; i < s->nb_samples; i++)
     892           0 :                 samples[i] = decoded[i] + 0x80U;
     893             :         }
     894           0 :         break;
     895          38 :     case AV_SAMPLE_FMT_S16P:
     896         114 :         for (chan = 0; chan < avctx->channels; chan++) {
     897          76 :             int16_t *samples = (int16_t *)frame->extended_data[chan];
     898          76 :             int32_t *decoded = s->decoded[chan];
     899      837976 :             for (i = 0; i < s->nb_samples; i++)
     900      837900 :                 samples[i] = decoded[i];
     901             :         }
     902          38 :         break;
     903           0 :     case AV_SAMPLE_FMT_S32P:
     904           0 :         for (chan = 0; chan < avctx->channels; chan++) {
     905           0 :             int32_t *samples = (int32_t *)frame->extended_data[chan];
     906           0 :             for (i = 0; i < s->nb_samples; i++)
     907           0 :                 samples[i] *= 1U << 8;
     908             :         }
     909           0 :         break;
     910             :     }
     911             : 
     912          38 :     *got_frame_ptr = 1;
     913             : 
     914          38 :     return pkt->size;
     915             : }
     916             : 
     917             : #if HAVE_THREADS
     918           0 : static int init_thread_copy(AVCodecContext *avctx)
     919             : {
     920           0 :     TAKDecContext *s = avctx->priv_data;
     921           0 :     s->avctx = avctx;
     922           0 :     return 0;
     923             : }
     924             : 
     925           0 : static int update_thread_context(AVCodecContext *dst,
     926             :                                  const AVCodecContext *src)
     927             : {
     928           0 :     TAKDecContext *tsrc = src->priv_data;
     929           0 :     TAKDecContext *tdst = dst->priv_data;
     930             : 
     931           0 :     if (dst == src)
     932           0 :         return 0;
     933           0 :     memcpy(&tdst->ti, &tsrc->ti, sizeof(TAKStreamInfo));
     934           0 :     return 0;
     935             : }
     936             : #endif
     937             : 
     938           2 : static av_cold int tak_decode_close(AVCodecContext *avctx)
     939             : {
     940           2 :     TAKDecContext *s = avctx->priv_data;
     941             : 
     942           2 :     av_freep(&s->decode_buffer);
     943             : 
     944           2 :     return 0;
     945             : }
     946             : 
     947             : AVCodec ff_tak_decoder = {
     948             :     .name             = "tak",
     949             :     .long_name        = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
     950             :     .type             = AVMEDIA_TYPE_AUDIO,
     951             :     .id               = AV_CODEC_ID_TAK,
     952             :     .priv_data_size   = sizeof(TAKDecContext),
     953             :     .init             = tak_decode_init,
     954             :     .close            = tak_decode_close,
     955             :     .decode           = tak_decode_frame,
     956             :     .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     957             :     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
     958             :     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     959             :     .sample_fmts      = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
     960             :                                                         AV_SAMPLE_FMT_S16P,
     961             :                                                         AV_SAMPLE_FMT_S32P,
     962             :                                                         AV_SAMPLE_FMT_NONE },
     963             : };

Generated by: LCOV version 1.13