LCOV - code coverage report
Current view: top level - libavcodec - twinvqdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 126 177 71.2 %
Date: 2017-12-14 08:27:08 Functions: 7 7 100.0 %

          Line data    Source code
       1             : /*
       2             :  * TwinVQ decoder
       3             :  * Copyright (c) 2009 Vitor Sessak
       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             : #include <math.h>
      23             : #include <stdint.h>
      24             : 
      25             : #include "libavutil/channel_layout.h"
      26             : #include "avcodec.h"
      27             : #include "get_bits.h"
      28             : #include "internal.h"
      29             : #include "twinvq.h"
      30             : #include "twinvq_data.h"
      31             : 
      32             : static const TwinVQModeTab mode_08_08 = {
      33             :     {
      34             :         { 8, bark_tab_s08_64,  10, tab.fcb08s, 1, 5, tab.cb0808s0, tab.cb0808s1, 18 },
      35             :         { 2, bark_tab_m08_256, 20, tab.fcb08m, 2, 5, tab.cb0808m0, tab.cb0808m1, 16 },
      36             :         { 1, bark_tab_l08_512, 30, tab.fcb08l, 3, 6, tab.cb0808l0, tab.cb0808l1, 17 }
      37             :     },
      38             :     512, 12, tab.lsp08, 1, 5, 3, 3, tab.shape08, 8, 28, 20, 6, 40
      39             : };
      40             : 
      41             : static const TwinVQModeTab mode_11_08 = {
      42             :     {
      43             :         { 8, bark_tab_s11_64,  10, tab.fcb11s, 1, 5, tab.cb1108s0, tab.cb1108s1, 29 },
      44             :         { 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1108m0, tab.cb1108m1, 24 },
      45             :         { 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1108l0, tab.cb1108l1, 27 }
      46             :     },
      47             :     512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90
      48             : };
      49             : 
      50             : static const TwinVQModeTab mode_11_10 = {
      51             :     {
      52             :         { 8, bark_tab_s11_64,  10, tab.fcb11s, 1, 5, tab.cb1110s0, tab.cb1110s1, 21 },
      53             :         { 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1110m0, tab.cb1110m1, 18 },
      54             :         { 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1110l0, tab.cb1110l1, 20 }
      55             :     },
      56             :     512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90
      57             : };
      58             : 
      59             : static const TwinVQModeTab mode_16_16 = {
      60             :     {
      61             :         { 8, bark_tab_s16_128,  10, tab.fcb16s, 1, 5, tab.cb1616s0, tab.cb1616s1, 16 },
      62             :         { 2, bark_tab_m16_512,  20, tab.fcb16m, 2, 5, tab.cb1616m0, tab.cb1616m1, 15 },
      63             :         { 1, bark_tab_l16_1024, 30, tab.fcb16l, 3, 6, tab.cb1616l0, tab.cb1616l1, 16 }
      64             :     },
      65             :     1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16, 9, 56, 60, 7, 180
      66             : };
      67             : 
      68             : static const TwinVQModeTab mode_22_20 = {
      69             :     {
      70             :         { 8, bark_tab_s22_128,  10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18 },
      71             :         { 2, bark_tab_m22_512,  20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17 },
      72             :         { 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18 }
      73             :     },
      74             :     1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
      75             : };
      76             : 
      77             : static const TwinVQModeTab mode_22_24 = {
      78             :     {
      79             :         { 8, bark_tab_s22_128,  10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15 },
      80             :         { 2, bark_tab_m22_512,  20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14 },
      81             :         { 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15 }
      82             :     },
      83             :     1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
      84             : };
      85             : 
      86             : static const TwinVQModeTab mode_22_32 = {
      87             :     {
      88             :         { 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11 },
      89             :         { 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11 },
      90             :         { 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12 }
      91             :     },
      92             :     512, 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72
      93             : };
      94             : 
      95             : static const TwinVQModeTab mode_44_40 = {
      96             :     {
      97             :         { 16, bark_tab_s44_128,  10, tab.fcb44s, 1, 6, tab.cb4440s0, tab.cb4440s1, 18 },
      98             :         { 4,  bark_tab_m44_512,  20, tab.fcb44m, 2, 6, tab.cb4440m0, tab.cb4440m1, 17 },
      99             :         { 1,  bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4440l0, tab.cb4440l1, 17 }
     100             :     },
     101             :     2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432
     102             : };
     103             : 
     104             : static const TwinVQModeTab mode_44_48 = {
     105             :     {
     106             :         { 16, bark_tab_s44_128,  10, tab.fcb44s, 1, 6, tab.cb4448s0, tab.cb4448s1, 15 },
     107             :         { 4,  bark_tab_m44_512,  20, tab.fcb44m, 2, 6, tab.cb4448m0, tab.cb4448m1, 14 },
     108             :         { 1,  bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4448l0, tab.cb4448l1, 14 }
     109             :     },
     110             :     2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432
     111             : };
     112             : 
     113             : /**
     114             :  * Evaluate a * b / 400 rounded to the nearest integer. When, for example,
     115             :  * a * b == 200 and the nearest integer is ill-defined, use a table to emulate
     116             :  * the following broken float-based implementation used by the binary decoder:
     117             :  *
     118             :  * @code
     119             :  * static int very_broken_op(int a, int b)
     120             :  * {
     121             :  *    static float test; // Ugh, force gcc to do the division first...
     122             :  *
     123             :  *    test = a / 400.0;
     124             :  *    return b * test + 0.5;
     125             :  * }
     126             :  * @endcode
     127             :  *
     128             :  * @note if this function is replaced by just ROUNDED_DIV(a * b, 400.0), the
     129             :  * stddev between the original file (before encoding with Yamaha encoder) and
     130             :  * the decoded output increases, which leads one to believe that the encoder
     131             :  * expects exactly this broken calculation.
     132             :  */
     133       31777 : static int very_broken_op(int a, int b)
     134             : {
     135       31777 :     int x = a * b + 200;
     136             :     int size;
     137             :     const uint8_t *rtab;
     138             : 
     139       31777 :     if (x % 400 || b % 5)
     140       31703 :         return x / 400;
     141             : 
     142          74 :     x /= 400;
     143             : 
     144          74 :     size = tabs[b / 5].size;
     145          74 :     rtab = tabs[b / 5].tab;
     146          74 :     return x - rtab[size * av_log2(2 * (x - 1) / size) + (x - 1) % size];
     147             : }
     148             : 
     149             : /**
     150             :  * Sum to data a periodic peak of a given period, width and shape.
     151             :  *
     152             :  * @param period the period of the peak divided by 400.0
     153             :  */
     154        2475 : static void add_peak(int period, int width, const float *shape,
     155             :                      float ppc_gain, float *speech, int len)
     156             : {
     157             :     int i, j;
     158             : 
     159        2475 :     const float *shape_end = shape + len;
     160             :     int center;
     161             : 
     162             :     // First peak centered around zero
     163        6426 :     for (i = 0; i < width / 2; i++)
     164        3951 :         speech[i] += ppc_gain * *shape++;
     165             : 
     166       31777 :     for (i = 1; i < ROUNDED_DIV(len, width); i++) {
     167       29302 :         center = very_broken_op(period, i);
     168      108375 :         for (j = -width / 2; j < (width + 1) / 2; j++)
     169       79073 :             speech[j + center] += ppc_gain * *shape++;
     170             :     }
     171             : 
     172             :     // For the last block, be careful not to go beyond the end of the buffer
     173        2475 :     center = very_broken_op(period, i);
     174        8551 :     for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++)
     175        6076 :         speech[j + center] += ppc_gain * *shape++;
     176        2475 : }
     177             : 
     178        2475 : static void decode_ppc(TwinVQContext *tctx, int period_coef, int g_coef,
     179             :                        const float *shape, float *speech)
     180             : {
     181        2475 :     const TwinVQModeTab *mtab = tctx->mtab;
     182        2475 :     int isampf = tctx->avctx->sample_rate /  1000;
     183        2475 :     int ibps   = tctx->avctx->bit_rate    / (1000 * tctx->avctx->channels);
     184        2475 :     int min_period   = ROUNDED_DIV(40 * 2 * mtab->size, isampf);
     185        2475 :     int max_period   = ROUNDED_DIV(40 * 2 * mtab->size * 6, isampf);
     186        2475 :     int period_range = max_period - min_period;
     187        2475 :     float pgain_step = 25000.0 / ((1 << mtab->pgain_bit) - 1);
     188        2475 :     float ppc_gain   = 1.0 / 8192 *
     189        4950 :                        twinvq_mulawinv(pgain_step * g_coef +
     190        2475 :                                            pgain_step / 2,
     191             :                                        25000.0, TWINVQ_PGAIN_MU);
     192             : 
     193             :     // This is actually the period multiplied by 400. It is just linearly coded
     194             :     // between its maximum and minimum value.
     195        2475 :     int period = min_period +
     196        2475 :                  ROUNDED_DIV(period_coef * period_range,
     197             :                              (1 << mtab->ppc_period_bit) - 1);
     198             :     int width;
     199             : 
     200        2475 :     if (isampf == 22 && ibps == 32) {
     201             :         // For some unknown reason, NTT decided to code this case differently...
     202           0 :         width = ROUNDED_DIV((period + 800) * mtab->peak_per2wid,
     203             :                             400 * mtab->size);
     204             :     } else
     205        2475 :         width = period * mtab->peak_per2wid / (400 * mtab->size);
     206             : 
     207        2475 :     add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len);
     208        2475 : }
     209             : 
     210        2707 : static void dec_bark_env(TwinVQContext *tctx, const uint8_t *in, int use_hist,
     211             :                          int ch, float *out, float gain,
     212             :                          enum TwinVQFrameType ftype)
     213             : {
     214        2707 :     const TwinVQModeTab *mtab = tctx->mtab;
     215             :     int i, j;
     216        2707 :     float *hist     = tctx->bark_hist[ftype][ch];
     217        2707 :     float val       = ((const float []) { 0.4, 0.35, 0.28 })[ftype];
     218        2707 :     int bark_n_coef = mtab->fmode[ftype].bark_n_coef;
     219        2707 :     int fw_cb_len   = mtab->fmode[ftype].bark_env_size / bark_n_coef;
     220        2707 :     int idx         = 0;
     221             : 
     222       24827 :     for (i = 0; i < fw_cb_len; i++)
     223      105880 :         for (j = 0; j < bark_n_coef; j++, idx++) {
     224       83760 :             float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] *
     225             :                          (1.0 / 4096);
     226      138334 :             float st   = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0
     227      138334 :                                   : tmp2 + 1.0;
     228             : 
     229       83760 :             hist[idx] = tmp2;
     230       83760 :             if (st < -1.0)
     231           0 :                 st = 1.0;
     232             : 
     233       83760 :             twinvq_memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]);
     234       83760 :             out += mtab->fmode[ftype].bark_tab[idx];
     235             :         }
     236        2707 : }
     237             : 
     238        5063 : static void read_cb_data(TwinVQContext *tctx, GetBitContext *gb,
     239             :                          uint8_t *dst, enum TwinVQFrameType ftype)
     240             : {
     241             :     int i;
     242             : 
     243      165515 :     for (i = 0; i < tctx->n_div[ftype]; i++) {
     244      160452 :         int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]);
     245             : 
     246      160452 :         *dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]);
     247      160452 :         *dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]);
     248             :     }
     249        5063 : }
     250             : 
     251        2588 : static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx,
     252             :                                  const uint8_t *buf, int buf_size)
     253             : {
     254        2588 :     TwinVQFrameData     *bits = &tctx->bits[0];
     255        2588 :     const TwinVQModeTab *mtab = tctx->mtab;
     256        2588 :     int channels              = tctx->avctx->channels;
     257             :     int sub;
     258             :     GetBitContext gb;
     259             :     int i, j, k, ret;
     260             : 
     261        2588 :     if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
     262           0 :         return ret;
     263        2588 :     skip_bits(&gb, get_bits(&gb, 8));
     264             : 
     265        2588 :     bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS);
     266             : 
     267        2588 :     if (bits->window_type > 8) {
     268           0 :         av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n");
     269           0 :         return AVERROR_INVALIDDATA;
     270             :     }
     271             : 
     272        2588 :     bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits[0].window_type];
     273             : 
     274        2588 :     sub = mtab->fmode[bits->ftype].sub;
     275             : 
     276        2588 :     read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype);
     277             : 
     278        5176 :     for (i = 0; i < channels; i++)
     279        5295 :         for (j = 0; j < sub; j++)
     280       13063 :             for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++)
     281       10356 :                 bits->bark1[i][j][k] =
     282       10356 :                     get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit);
     283             : 
     284        5176 :     for (i = 0; i < channels; i++)
     285        5295 :         for (j = 0; j < sub; j++)
     286        2707 :             bits->bark_use_hist[i][j] = get_bits1(&gb);
     287             : 
     288        2588 :     if (bits->ftype == TWINVQ_FT_LONG) {
     289        4950 :         for (i = 0; i < channels; i++)
     290        2475 :             bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
     291             :     } else {
     292         226 :         for (i = 0; i < channels; i++) {
     293         113 :             bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
     294         345 :             for (j = 0; j < sub; j++)
     295         232 :                 bits->sub_gain_bits[i * sub + j] = get_bits(&gb,
     296             :                                                        TWINVQ_SUB_GAIN_BITS);
     297             :         }
     298             :     }
     299             : 
     300        5176 :     for (i = 0; i < channels; i++) {
     301        2588 :         bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0);
     302        2588 :         bits->lpc_idx1[i]     = get_bits(&gb, mtab->lsp_bit1);
     303             : 
     304       10352 :         for (j = 0; j < mtab->lsp_split; j++)
     305        7764 :             bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2);
     306             :     }
     307             : 
     308        2588 :     if (bits->ftype == TWINVQ_FT_LONG) {
     309        2475 :         read_cb_data(tctx, &gb, bits->ppc_coeffs, 3);
     310        4950 :         for (i = 0; i < channels; i++) {
     311        2475 :             bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit);
     312        2475 :             bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit);
     313             :         }
     314             :     }
     315             : 
     316        2588 :     return (get_bits_count(&gb) + 7) / 8;
     317             : }
     318             : 
     319           3 : static av_cold int twinvq_decode_init(AVCodecContext *avctx)
     320             : {
     321             :     int isampf, ibps;
     322           3 :     TwinVQContext *tctx = avctx->priv_data;
     323             : 
     324           3 :     if (!avctx->extradata || avctx->extradata_size < 12) {
     325           0 :         av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n");
     326           0 :         return AVERROR_INVALIDDATA;
     327             :     }
     328           3 :     avctx->channels = AV_RB32(avctx->extradata)     + 1;
     329           3 :     avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000;
     330           3 :     isampf          = AV_RB32(avctx->extradata + 8);
     331             : 
     332           3 :     if (isampf < 8 || isampf > 44) {
     333           0 :         av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate\n");
     334           0 :         return AVERROR_INVALIDDATA;
     335             :     }
     336           3 :     switch (isampf) {
     337           0 :     case 44:
     338           0 :         avctx->sample_rate = 44100;
     339           0 :         break;
     340           3 :     case 22:
     341           3 :         avctx->sample_rate = 22050;
     342           3 :         break;
     343           0 :     case 11:
     344           0 :         avctx->sample_rate = 11025;
     345           0 :         break;
     346           0 :     default:
     347           0 :         avctx->sample_rate = isampf * 1000;
     348           0 :         break;
     349             :     }
     350             : 
     351           3 :     if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) {
     352           0 :         av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
     353             :                avctx->channels);
     354           0 :         return -1;
     355             :     }
     356           6 :     avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO
     357           3 :                                                  : AV_CH_LAYOUT_STEREO;
     358             : 
     359           3 :     ibps = avctx->bit_rate / (1000 * avctx->channels);
     360           3 :     if (ibps < 8 || ibps > 48) {
     361           0 :         av_log(avctx, AV_LOG_ERROR, "Bad bitrate per channel value %d\n", ibps);
     362           0 :         return AVERROR_INVALIDDATA;
     363             :     }
     364             : 
     365           3 :     switch ((isampf << 8) + ibps) {
     366           0 :     case (8 << 8) + 8:
     367           0 :         tctx->mtab = &mode_08_08;
     368           0 :         break;
     369           0 :     case (11 << 8) + 8:
     370           0 :         tctx->mtab = &mode_11_08;
     371           0 :         break;
     372           0 :     case (11 << 8) + 10:
     373           0 :         tctx->mtab = &mode_11_10;
     374           0 :         break;
     375           0 :     case (16 << 8) + 16:
     376           0 :         tctx->mtab = &mode_16_16;
     377           0 :         break;
     378           3 :     case (22 << 8) + 20:
     379           3 :         tctx->mtab = &mode_22_20;
     380           3 :         break;
     381           0 :     case (22 << 8) + 24:
     382           0 :         tctx->mtab = &mode_22_24;
     383           0 :         break;
     384           0 :     case (22 << 8) + 32:
     385           0 :         tctx->mtab = &mode_22_32;
     386           0 :         break;
     387           0 :     case (44 << 8) + 40:
     388           0 :         tctx->mtab = &mode_44_40;
     389           0 :         break;
     390           0 :     case (44 << 8) + 48:
     391           0 :         tctx->mtab = &mode_44_48;
     392           0 :         break;
     393           0 :     default:
     394           0 :         av_log(avctx, AV_LOG_ERROR,
     395             :                "This version does not support %d kHz - %d kbit/s/ch mode.\n",
     396             :                isampf, isampf);
     397           0 :         return -1;
     398             :     }
     399             : 
     400           3 :     tctx->codec          = TWINVQ_CODEC_VQF;
     401           3 :     tctx->read_bitstream = twinvq_read_bitstream;
     402           3 :     tctx->dec_bark_env   = dec_bark_env;
     403           3 :     tctx->decode_ppc     = decode_ppc;
     404           6 :     tctx->frame_size     = avctx->bit_rate * tctx->mtab->size
     405           3 :                                            / avctx->sample_rate + 8;
     406           3 :     tctx->is_6kbps       = 0;
     407           3 :     if (avctx->block_align && avctx->block_align * 8 / tctx->frame_size > 1) {
     408           0 :         av_log(avctx, AV_LOG_ERROR,
     409             :                "VQF TwinVQ should have only one frame per packet\n");
     410           0 :         return AVERROR_INVALIDDATA;
     411             :     }
     412             : 
     413           3 :     return ff_twinvq_decode_init(avctx);
     414             : }
     415             : 
     416             : AVCodec ff_twinvq_decoder = {
     417             :     .name           = "twinvq",
     418             :     .long_name      = NULL_IF_CONFIG_SMALL("VQF TwinVQ"),
     419             :     .type           = AVMEDIA_TYPE_AUDIO,
     420             :     .id             = AV_CODEC_ID_TWINVQ,
     421             :     .priv_data_size = sizeof(TwinVQContext),
     422             :     .init           = twinvq_decode_init,
     423             :     .close          = ff_twinvq_decode_close,
     424             :     .decode         = ff_twinvq_decode_frame,
     425             :     .capabilities   = AV_CODEC_CAP_DR1,
     426             :     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
     427             :                                                       AV_SAMPLE_FMT_NONE },
     428             : };

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