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FFmpeg编解码ADPCM_*格式音频

发布2018-01-11浏览7811次

详情内容

ADPCM格式音频编解码：https://lists.ffmpeg.org/doxygen/3.2/adpcm_8c_source.html

以下是代码：

  1.  1 /*
  2.     2  * Copyright (c) 2001-2003 The FFmpeg project
  3.     3  *
  4.     4  * first version by Francois Revol (revol@free.fr)
  5.     5  * fringe ADPCM codecs (e.g., DK3, DK4, Westwood)
  6.     6  *   by Mike Melanson (melanson@pcisys.net)
  7.     7  * CD-ROM XA ADPCM codec by BERO
  8.     8  * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)
  9.     9  * EA ADPCM R1/R2/R3 decoder by Peter Ross (pross@xvid.org)
  10.    10  * EA IMA EACS decoder by Peter Ross (pross@xvid.org)
  11.    11  * EA IMA SEAD decoder by Peter Ross (pross@xvid.org)
  12.    12  * EA ADPCM XAS decoder by Peter Ross (pross@xvid.org)
  13.    13  * MAXIS EA ADPCM decoder by Robert Marston (rmarston@gmail.com)
  14.    14  * THP ADPCM decoder by Marco Gerards (mgerards@xs4all.nl)
  15.    15  *
  16.    16  * This file is part of FFmpeg.
  17.    17  *
  18.    18  * FFmpeg is free software; you can redistribute it and/or
  19.    19  * modify it under the terms of the GNU Lesser General Public
  20.    20  * License as published by the Free Software Foundation; either
  21.    21  * version 2.1 of the License, or (at your option) any later version.
  22.    22  *
  23.    23  * FFmpeg is distributed in the hope that it will be useful,
  24.    24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25.    25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  26.    26  * Lesser General Public License for more details.
  27.    27  *
  28.    28  * You should have received a copy of the GNU Lesser General Public
  29.    29  * License along with FFmpeg; if not, write to the Free Software
  30.    30  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  31.    31  */
  32.    32 #include "avcodec.h"
  33.    33 #include "get_bits.h"
  34.    34 #include "bytestream.h"
  35.    35 #include "adpcm.h"
  36.    36 #include "adpcm_data.h"
  37.    37 #include "internal.h"
  38.    38 
  39.    39 /**
  40.    40  * @file
  41.    41  * ADPCM decoders
  42.    42  * Features and limitations:
  43.    43  *
  44.    44  * Reference documents:
  45.    45  * http://wiki.multimedia.cx/index.php?title=Category:ADPCM_Audio_Codecs
  46.    46  * http://www.pcisys.net/~melanson/codecs/simpleaudio.html [dead]
  47.    47  * http://www.geocities.com/SiliconValley/8682/aud3.txt [dead]
  48.    48  * http://openquicktime.sourceforge.net/
  49.    49  * XAnim sources (xa_codec.c) http://xanim.polter.net/
  50.    50  * http://www.cs.ucla.edu/~leec/mediabench/applications.html [dead]
  51.    51  * SoX source code http://sox.sourceforge.net/
  52.    52  *
  53.    53  * CD-ROM XA:
  54.    54  * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html [dead]
  55.    55  * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html [dead]
  56.    56  * readstr http://www.geocities.co.jp/Playtownhttps://cdn.jxasp.com:9143/image/2004/
  57.    57  */
  58.    58 
  59.    59 /* These are for CD-ROM XA ADPCM */
  60.    60 static const int xa_adpcm_table[5][2] = {
  61.    61     {   0,   0 },
  62.    62     {  60,   0 },
  63.    63     { 115, -52 },
  64.    64     {  98, -55 },
  65.    65     { 122, -60 }
  66.    66 };
  67.    67 
  68.    68 static const int ea_adpcm_table[] = {
  69.    69     0,  240,  460,  392,
  70.    70     0,    0, -208, -220,
  71.    71     0,    1,    3,    4,
  72.    72     7,    8,   10,   11,
  73.    73     0,   -1,   -3,   -4
  74.    74 };
  75.    75 
  76.    76 // padded to zero where table size is less then 16
  77.    77 static const int swf_index_tables[4][16] = {
  78.    78     /*2*/ { -1, 2 },
  79.    79     /*3*/ { -1, -1, 2, 4 },
  80.    80     /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },
  81.    81     /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
  82.    82 };
  83.    83 
  84.    84 /* end of tables */
  85.    85 
  86.    86 typedef struct ADPCMDecodeContext {
  87.    87     ADPCMChannelStatus status[14];
  88.    88     int vqa_version;                /**< VQA version. Used for ADPCM_IMA_WS */
  89.    89     int has_status;
  90.    90 } ADPCMDecodeContext;
  91.    91 
  92.    92 static av_cold int adpcm_decode_init(AVCodecContext * avctx)
  93.    93 {
  94.    94     ADPCMDecodeContext *c = avctx->priv_data;
  95.    95     unsigned int min_channels = 1;
  96.    96     unsigned int max_channels = 2;
  97.    97 
  98.    98     switch(avctx->codec->id) {
  99.    99     case AV_CODEC_ID_ADPCM_DTK:
  100.   100     case AV_CODEC_ID_ADPCM_EA:
  101.   101         min_channels = 2;
  102.   102         break;
  103.   103     case AV_CODEC_ID_ADPCM_AFC:
  104.   104     case AV_CODEC_ID_ADPCM_EA_R1:
  105.   105     case AV_CODEC_ID_ADPCM_EA_R2:
  106.   106     case AV_CODEC_ID_ADPCM_EA_R3:
  107.   107     case AV_CODEC_ID_ADPCM_EA_XAS:
  108.   108         max_channels = 6;
  109.   109         break;
  110.   110     case AV_CODEC_ID_ADPCM_MTAF:
  111.   111         min_channels = 2;
  112.   112         max_channels = 8;
  113.   113         break;
  114.   114     case AV_CODEC_ID_ADPCM_PSX:
  115.   115         max_channels = 8;
  116.   116         break;
  117.   117     case AV_CODEC_ID_ADPCM_IMA_DAT4:
  118.   118     case AV_CODEC_ID_ADPCM_THP:
  119.   119     case AV_CODEC_ID_ADPCM_THP_LE:
  120.   120         max_channels = 14;
  121.   121         break;
  122.   122     }
  123.   123     if (avctx->channels < min_channels || avctx->channels > max_channels) {
  124.   124         av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
  125.   125         return AVERROR(EINVAL);
  126.   126     }
  127.   127 
  128.   128     switch(avctx->codec->id) {
  129.   129     case AV_CODEC_ID_ADPCM_CT:
  130.   130         c->status[0].step = c->status[1].step = 511;
  131.   131         break;
  132.   132     case AV_CODEC_ID_ADPCM_IMA_WAV:
  133.   133         if (avctx->bits_per_coded_sample < 2 || avctx->bits_per_coded_sample > 5)
  134.   134             return AVERROR_INVALIDDATA;
  135.   135         break;
  136.   136     case AV_CODEC_ID_ADPCM_IMA_APC:
  137.   137         if (avctx->extradata && avctx->extradata_size >= 8) {
  138.   138             c->status[0].predictor = AV_RL32(avctx->extradata);
  139.   139             c->status[1].predictor = AV_RL32(avctx->extradata + 4);
  140.   140         }
  141.   141         break;
  142.   142     case AV_CODEC_ID_ADPCM_IMA_WS:
  143.   143         if (avctx->extradata && avctx->extradata_size >= 2)
  144.   144             c->vqa_version = AV_RL16(avctx->extradata);
  145.   145         break;
  146.   146     default:
  147.   147         break;
  148.   148     }
  149.   149 
  150.   150     switch(avctx->codec->id) {
  151.   151         case AV_CODEC_ID_ADPCM_AICA:
  152.   152         case AV_CODEC_ID_ADPCM_IMA_DAT4:
  153.   153         case AV_CODEC_ID_ADPCM_IMA_QT:
  154.   154         case AV_CODEC_ID_ADPCM_IMA_WAV:
  155.   155         case AV_CODEC_ID_ADPCM_4XM:
  156.   156         case AV_CODEC_ID_ADPCM_XA:
  157.   157         case AV_CODEC_ID_ADPCM_EA_R1:
  158.   158         case AV_CODEC_ID_ADPCM_EA_R2:
  159.   159         case AV_CODEC_ID_ADPCM_EA_R3:
  160.   160         case AV_CODEC_ID_ADPCM_EA_XAS:
  161.   161         case AV_CODEC_ID_ADPCM_THP:
  162.   162         case AV_CODEC_ID_ADPCM_THP_LE:
  163.   163         case AV_CODEC_ID_ADPCM_AFC:
  164.   164         case AV_CODEC_ID_ADPCM_DTK:
  165.   165         case AV_CODEC_ID_ADPCM_PSX:
  166.   166         case AV_CODEC_ID_ADPCM_MTAF:
  167.   167             avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
  168.   168             break;
  169.   169         case AV_CODEC_ID_ADPCM_IMA_WS:
  170.   170             avctx->sample_fmt = c->vqa_version == 3 ? AV_SAMPLE_FMT_S16P :
  171.   171                                                       AV_SAMPLE_FMT_S16;
  172.   172             break;
  173.   173         default:
  174.   174             avctx->sample_fmt = AV_SAMPLE_FMT_S16;
  175.   175     }
  176.   176 
  177.   177     return 0;
  178.   178 }
  179.   179 
  180.   180 static inline int16_t adpcm_ima_expand_nibble(ADPCMChannelStatus *c, int8_t nibble, int shift)
  181.   181 {
  182.   182     int step_index;
  183.   183     int predictor;
  184.   184     int sign, delta, diff, step;
  185.   185 
  186.   186     step = ff_adpcm_step_table[c->step_index];
  187.   187     step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
  188.   188     step_index = av_clip(step_index, 0, 88);
  189.   189 
  190.   190     sign = nibble & 8;
  191.   191     delta = nibble & 7;
  192.   192     /* perform direct multiplication instead of series of jumps proposed by
  193.   193      * the reference ADPCM implementation since modern CPUs can do the mults
  194.   194      * quickly enough */
  195.   195     diff = ((2 * delta + 1) * step) >> shift;
  196.   196     predictor = c->predictor;
  197.   197     if (sign) predictor -= diff;
  198.   198     else predictor += diff;
  199.   199 
  200.   200     c->predictor = av_clip_int16(predictor);
  201.   201     c->step_index = step_index;
  202.   202 
  203.   203     return (int16_t)c->predictor;
  204.   204 }
  205.   205 
  206.   206 static inline int16_t adpcm_ima_wav_expand_nibble(ADPCMChannelStatus *c, GetBitContext *gb, int bps)
  207.   207 {
  208.   208     int nibble, step_index, predictor, sign, delta, diff, step, shift;
  209.   209 
  210.   210     shift = bps - 1;
  211.   211     nibble = get_bits_le(gb, bps),
  212.   212     step = ff_adpcm_step_table[c->step_index];
  213.   213     step_index = c->step_index + ff_adpcm_index_tables[bps - 2][nibble];
  214.   214     step_index = av_clip(step_index, 0, 88);
  215.   215 
  216.   216     sign = nibble & (1 << shift);
  217.   217     delta = av_mod_uintp2(nibble, shift);
  218.   218     diff = ((2 * delta + 1) * step) >> shift;
  219.   219     predictor = c->predictor;
  220.   220     if (sign) predictor -= diff;
  221.   221     else predictor += diff;
  222.   222 
  223.   223     c->predictor = av_clip_int16(predictor);
  224.   224     c->step_index = step_index;
  225.   225 
  226.   226     return (int16_t)c->predictor;
  227.   227 }
  228.   228 
  229.   229 static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)
  230.   230 {
  231.   231     int step_index;
  232.   232     int predictor;
  233.   233     int diff, step;
  234.   234 
  235.   235     step = ff_adpcm_step_table[c->step_index];
  236.   236     step_index = c->step_index + ff_adpcm_index_table[nibble];
  237.   237     step_index = av_clip(step_index, 0, 88);
  238.   238 
  239.   239     diff = step >> 3;
  240.   240     if (nibble & 4) diff += step;
  241.   241     if (nibble & 2) diff += step >> 1;
  242.   242     if (nibble & 1) diff += step >> 2;
  243.   243 
  244.   244     if (nibble & 8)
  245.   245         predictor = c->predictor - diff;
  246.   246     else
  247.   247         predictor = c->predictor + diff;
  248.   248 
  249.   249     c->predictor = av_clip_int16(predictor);
  250.   250     c->step_index = step_index;
  251.   251 
  252.   252     return c->predictor;
  253.   253 }
  254.   254 
  255.   255 static inline int16_t adpcm_ms_expand_nibble(ADPCMChannelStatus *c, int nibble)
  256.   256 {
  257.   257     int predictor;
  258.   258 
  259.   259     predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
  260.   260     predictor += ((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
  261.   261 
  262.   262     c->sample2 = c->sample1;
  263.   263     c->sample1 = av_clip_int16(predictor);
  264.   264     c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;
  265.   265     if (c->idelta < 16) c->idelta = 16;
  266.   266     if (c->idelta > INT_MAX/768) {
  267.   267         av_log(NULL, AV_LOG_WARNING, "idelta overflow\n");
  268.   268         c->idelta = INT_MAX/768;
  269.   269     }
  270.   270 
  271.   271     return c->sample1;
  272.   272 }
  273.   273 
  274.   274 static inline int16_t adpcm_ima_oki_expand_nibble(ADPCMChannelStatus *c, int nibble)
  275.   275 {
  276.   276     int step_index, predictor, sign, delta, diff, step;
  277.   277 
  278.   278     step = ff_adpcm_oki_step_table[c->step_index];
  279.   279     step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
  280.   280     step_index = av_clip(step_index, 0, 48);
  281.   281 
  282.   282     sign = nibble & 8;
  283.   283     delta = nibble & 7;
  284.   284     diff = ((2 * delta + 1) * step) >> 3;
  285.   285     predictor = c->predictor;
  286.   286     if (sign) predictor -= diff;
  287.   287     else predictor += diff;
  288.   288 
  289.   289     c->predictor = av_clip_intp2(predictor, 11);
  290.   290     c->step_index = step_index;
  291.   291 
  292.   292     return c->predictor << 4;
  293.   293 }
  294.   294 
  295.   295 static inline int16_t adpcm_ct_expand_nibble(ADPCMChannelStatus *c, int8_t nibble)
  296.   296 {
  297.   297     int sign, delta, diff;
  298.   298     int new_step;
  299.   299 
  300.   300     sign = nibble & 8;
  301.   301     delta = nibble & 7;
  302.   302     /* perform direct multiplication instead of series of jumps proposed by
  303.   303      * the reference ADPCM implementation since modern CPUs can do the mults
  304.   304      * quickly enough */
  305.   305     diff = ((2 * delta + 1) * c->step) >> 3;
  306.   306     /* predictor update is not so trivial: predictor is multiplied on 254https://cdn.jxasp.com:9143/image/256 before updating */
  307.   307     c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
  308.   308     c->predictor = av_clip_int16(c->predictor);
  309.   309     /* calculate new step and clamp it to range 511..32767 */
  310.   310     new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;
  311.   311     c->step = av_clip(new_step, 511, 32767);
  312.   312 
  313.   313     return (int16_t)c->predictor;
  314.   314 }
  315.   315 
  316.   316 static inline int16_t adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, int8_t nibble, int size, int shift)
  317.   317 {
  318.   318     int sign, delta, diff;
  319.   319 
  320.   320     sign = nibble & (1<<(size-1));
  321.   321     delta = nibble & ((1<<(size-1))-1);
  322.   322     diff = delta << (7 + c->step + shift);
  323.   323 
  324.   324     /* clamp result */
  325.   325     c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);
  326.   326 
  327.   327     /* calculate new step */
  328.   328     if (delta >= (2*size - 3) && c->step < 3)
  329.   329         c->step++;
  330.   330     else if (delta == 0 && c->step > 0)
  331.   331         c->step--;
  332.   332 
  333.   333     return (int16_t) c->predictor;
  334.   334 }
  335.   335 
  336.   336 static inline int16_t adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, uint8_t nibble)
  337.   337 {
  338.   338     if(!c->step) {
  339.   339         c->predictor = 0;
  340.   340         c->step = 127;
  341.   341     }
  342.   342 
  343.   343     c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;
  344.   344     c->predictor = av_clip_int16(c->predictor);
  345.   345     c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
  346.   346     c->step = av_clip(c->step, 127, 24567);
  347.   347     return c->predictor;
  348.   348 }
  349.   349 
  350.   350 static inline int16_t adpcm_mtaf_expand_nibble(ADPCMChannelStatus *c, uint8_t nibble)
  351.   351 {
  352.   352     c->predictor += ff_adpcm_mtaf_stepsize[c->step][nibble];
  353.   353     c->predictor = av_clip_int16(c->predictor);
  354.   354     c->step += ff_adpcm_index_table[nibble];
  355.   355     c->step = av_clip_uintp2(c->step, 5);
  356.   356     return c->predictor;
  357.   357 }
  358.   358 
  359.   359 static int xa_decode(AVCodecContext *avctx, int16_t *out0, int16_t *out1,
  360.   360                      const uint8_t *in, ADPCMChannelStatus *left,
  361.   361                      ADPCMChannelStatus *right, int channels, int sample_offset)
  362.   362 {
  363.   363     int i, j;
  364.   364     int shift,filter,f0,f1;
  365.   365     int s_1,s_2;
  366.   366     int d,s,t;
  367.   367 
  368.   368     out0 += sample_offset;
  369.   369     if (channels == 1)
  370.   370         out1 = out0 + 28;
  371.   371     else
  372.   372         out1 += sample_offset;
  373.   373 
  374.   374     for(i=0;i<4;i++) {
  375.   375         shift  = 12 - (in[4+i*2] & 15);
  376.   376         filter = in[4+i*2] >> 4;
  377.   377         if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {
  378.   378             avpriv_request_sample(avctx, "unknown XA-ADPCM filter %d", filter);
  379.   379             filter=0;
  380.   380         }
  381.   381         f0 = xa_adpcm_table[filter][0];
  382.   382         f1 = xa_adpcm_table[filter][1];
  383.   383 
  384.   384         s_1 = left->sample1;
  385.   385         s_2 = left->sample2;
  386.   386 
  387.   387         for(j=0;j<28;j++) {
  388.   388             d = in[16+i+j*4];
  389.   389 
  390.   390             t = sign_extend(d, 4);
  391.   391             s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
  392.   392             s_2 = s_1;
  393.   393             s_1 = av_clip_int16(s);
  394.   394             out0[j] = s_1;
  395.   395         }
  396.   396 
  397.   397         if (channels == 2) {
  398.   398             left->sample1 = s_1;
  399.   399             left->sample2 = s_2;
  400.   400             s_1 = right->sample1;
  401.   401             s_2 = right->sample2;
  402.   402         }
  403.   403 
  404.   404         shift  = 12 - (in[5+i*2] & 15);
  405.   405         filter = in[5+i*2] >> 4;
  406.   406         if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {
  407.   407             avpriv_request_sample(avctx, "unknown XA-ADPCM filter %d", filter);
  408.   408             filter=0;
  409.   409         }
  410.   410 
  411.   411         f0 = xa_adpcm_table[filter][0];
  412.   412         f1 = xa_adpcm_table[filter][1];
  413.   413 
  414.   414         for(j=0;j<28;j++) {
  415.   415             d = in[16+i+j*4];
  416.   416 
  417.   417             t = sign_extend(d >> 4, 4);
  418.   418             s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
  419.   419             s_2 = s_1;
  420.   420             s_1 = av_clip_int16(s);
  421.   421             out1[j] = s_1;
  422.   422         }
  423.   423 
  424.   424         if (channels == 2) {
  425.   425             right->sample1 = s_1;
  426.   426             right->sample2 = s_2;
  427.   427         } else {
  428.   428             left->sample1 = s_1;
  429.   429             left->sample2 = s_2;
  430.   430         }
  431.   431 
  432.   432         out0 += 28 * (3 - channels);
  433.   433         out1 += 28 * (3 - channels);
  434.   434     }
  435.   435 
  436.   436     return 0;
  437.   437 }
  438.   438 
  439.   439 static void adpcm_swf_decode(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int16_t *samples)
  440.   440 {
  441.   441     ADPCMDecodeContext *c = avctx->priv_data;
  442.   442     GetBitContext gb;
  443.   443     const int *table;
  444.   444     int k0, signmask, nb_bits, count;
  445.   445     int size = buf_size*8;
  446.   446     int i;
  447.   447 
  448.   448     init_get_bits(&gb, buf, size);
  449.   449 
  450.   450     //read bits & initial values
  451.   451     nb_bits = get_bits(&gb, 2)+2;
  452.   452     table = swf_index_tables[nb_bits-2];
  453.   453     k0 = 1 << (nb_bits-2);
  454.   454     signmask = 1 << (nb_bits-1);
  455.   455 
  456.   456     while (get_bits_count(&gb) <= size - 22*avctx->channels) {
  457.   457         for (i = 0; i < avctx->channels; i++) {
  458.   458             *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
  459.   459             c->status[i].step_index = get_bits(&gb, 6);
  460.   460         }
  461.   461 
  462.   462         for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
  463.   463             int i;
  464.   464 
  465.   465             for (i = 0; i < avctx->channels; i++) {
  466.   466                 // similar to IMA adpcm
  467.   467                 int delta = get_bits(&gb, nb_bits);
  468.   468                 int step = ff_adpcm_step_table[c->status[i].step_index];
  469.   469                 int vpdiff = 0; // vpdiff = (delta+0.5)*step/4
  470.   470                 int k = k0;
  471.   471 
  472.   472                 do {
  473.   473                     if (delta & k)
  474.   474                         vpdiff += step;
  475.   475                     step >>= 1;
  476.   476                     k >>= 1;
  477.   477                 } while(k);
  478.   478                 vpdiff += step;
  479.   479 
  480.   480                 if (delta & signmask)
  481.   481                     c->status[i].predictor -= vpdiff;
  482.   482                 else
  483.   483                     c->status[i].predictor += vpdiff;
  484.   484 
  485.   485                 c->status[i].step_index += table[delta & (~signmask)];
  486.   486 
  487.   487                 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
  488.   488                 c->status[i].predictor = av_clip_int16(c->status[i].predictor);
  489.   489 
  490.   490                 *samples++ = c->status[i].predictor;
  491.   491             }
  492.   492         }
  493.   493     }
  494.   494 }
  495.   495 
  496.   496 /**
  497.   497  * Get the number of samples that will be decoded from the packet.
  498.   498  * In one case, this is actually the maximum number of samples possible to
  499.   499  * decode with the given buf_size.
  500.   500  *
  501.   501  * @param[out] coded_samples set to the number of samples as coded in the
  502.   502  *                           packet, or 0 if the codec does not encode the
  503.   503  *                           number of samples in each frame.
  504.   504  * @param[out] approx_nb_samples set to non-zero if the number of samples
  505.   505  *                               returned is an approximation.
  506.   506  */
  507.   507 static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
  508.   508                           int buf_size, int *coded_samples, int *approx_nb_samples)
  509.   509 {
  510.   510     ADPCMDecodeContext *s = avctx->priv_data;
  511.   511     int nb_samples        = 0;
  512.   512     int ch                = avctx->channels;
  513.   513     int has_coded_samples = 0;
  514.   514     int header_size;
  515.   515 
  516.   516     *coded_samples = 0;
  517.   517     *approx_nb_samples = 0;
  518.   518 
  519.   519     if(ch <= 0)
  520.   520         return 0;
  521.   521 
  522.   522     switch (avctx->codec->id) {
  523.   523     /* constant, only check buf_size */
  524.   524     case AV_CODEC_ID_ADPCM_EA_XAS:
  525.   525         if (buf_size < 76 * ch)
  526.   526             return 0;
  527.   527         nb_samples = 128;
  528.   528         break;
  529.   529     case AV_CODEC_ID_ADPCM_IMA_QT:
  530.   530         if (buf_size < 34 * ch)
  531.   531             return 0;
  532.   532         nb_samples = 64;
  533.   533         break;
  534.   534     /* simple 4-bit adpcm */
  535.   535     case AV_CODEC_ID_ADPCM_CT:
  536.   536     case AV_CODEC_ID_ADPCM_IMA_APC:
  537.   537     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
  538.   538     case AV_CODEC_ID_ADPCM_IMA_OKI:
  539.   539     case AV_CODEC_ID_ADPCM_IMA_WS:
  540.   540     case AV_CODEC_ID_ADPCM_YAMAHA:
  541.   541     case AV_CODEC_ID_ADPCM_AICA:
  542.   542         nb_samples = buf_size * 2 / ch;
  543.   543         break;
  544.   544     }
  545.   545     if (nb_samples)
  546.   546         return nb_samples;
  547.   547 
  548.   548     /* simple 4-bit adpcm, with header */
  549.   549     header_size = 0;
  550.   550     switch (avctx->codec->id) {
  551.   551         case AV_CODEC_ID_ADPCM_4XM:
  552.   552         case AV_CODEC_ID_ADPCM_IMA_DAT4:
  553.   553         case AV_CODEC_ID_ADPCM_IMA_ISS:     header_size = 4 * ch;      break;
  554.   554         case AV_CODEC_ID_ADPCM_IMA_AMV:     header_size = 8;           break;
  555.   555         case AV_CODEC_ID_ADPCM_IMA_SMJPEG:  header_size = 4 * ch;      break;
  556.   556     }
  557.   557     if (header_size > 0)
  558.   558         return (buf_size - header_size) * 2 / ch;
  559.   559 
  560.   560     /* more complex formats */
  561.   561     switch (avctx->codec->id) {
  562.   562     case AV_CODEC_ID_ADPCM_EA:
  563.   563         has_coded_samples = 1;
  564.   564         *coded_samples  = bytestream2_get_le32(gb);
  565.   565         *coded_samples -= *coded_samples % 28;
  566.   566         nb_samples      = (buf_size - 12) / 30 * 28;
  567.   567         break;
  568.   568     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:
  569.   569         has_coded_samples = 1;
  570.   570         *coded_samples = bytestream2_get_le32(gb);
  571.   571         nb_samples     = (buf_size - (4 + 8 * ch)) * 2 / ch;
  572.   572         break;
  573.   573     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:
  574.   574         nb_samples = (buf_size - ch) / ch * 2;
  575.   575         break;
  576.   576     case AV_CODEC_ID_ADPCM_EA_R1:
  577.   577     case AV_CODEC_ID_ADPCM_EA_R2:
  578.   578     case AV_CODEC_ID_ADPCM_EA_R3:
  579.   579         /* maximum number of samples */
  580.   580         /* has internal offsets and a per-frame switch to signal raw 16-bit */
  581.   581         has_coded_samples = 1;
  582.   582         switch (avctx->codec->id) {
  583.   583         case AV_CODEC_ID_ADPCM_EA_R1:
  584.   584             header_size    = 4 + 9 * ch;
  585.   585             *coded_samples = bytestream2_get_le32(gb);
  586.   586             break;
  587.   587         case AV_CODEC_ID_ADPCM_EA_R2:
  588.   588             header_size    = 4 + 5 * ch;
  589.   589             *coded_samples = bytestream2_get_le32(gb);
  590.   590             break;
  591.   591         case AV_CODEC_ID_ADPCM_EA_R3:
  592.   592             header_size    = 4 + 5 * ch;
  593.   593             *coded_samples = bytestream2_get_be32(gb);
  594.   594             break;
  595.   595         }
  596.   596         *coded_samples -= *coded_samples % 28;
  597.   597         nb_samples      = (buf_size - header_size) * 2 / ch;
  598.   598         nb_samples     -= nb_samples % 28;
  599.   599         *approx_nb_samples = 1;
  600.   600         break;
  601.   601     case AV_CODEC_ID_ADPCM_IMA_DK3:
  602.   602         if (avctx->block_align > 0)
  603.   603             buf_size = FFMIN(buf_size, avctx->block_align);
  604.   604         nb_samples = ((buf_size - 16) * 2 / 3 * 4) / ch;
  605.   605         break;
  606.   606     case AV_CODEC_ID_ADPCM_IMA_DK4:
  607.   607         if (avctx->block_align > 0)
  608.   608             buf_size = FFMIN(buf_size, avctx->block_align);
  609.   609         if (buf_size < 4 * ch)
  610.   610             return AVERROR_INVALIDDATA;
  611.   611         nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;
  612.   612         break;
  613.   613     case AV_CODEC_ID_ADPCM_IMA_RAD:
  614.   614         if (avctx->block_align > 0)
  615.   615             buf_size = FFMIN(buf_size, avctx->block_align);
  616.   616         nb_samples = (buf_size - 4 * ch) * 2 / ch;
  617.   617         break;
  618.   618     case AV_CODEC_ID_ADPCM_IMA_WAV:
  619.   619     {
  620.   620         int bsize = ff_adpcm_ima_block_sizes[avctx->bits_per_coded_sample - 2];
  621.   621         int bsamples = ff_adpcm_ima_block_samples[avctx->bits_per_coded_sample - 2];
  622.   622         if (avctx->block_align > 0)
  623.   623             buf_size = FFMIN(buf_size, avctx->block_align);
  624.   624         if (buf_size < 4 * ch)
  625.   625             return AVERROR_INVALIDDATA;
  626.   626         nb_samples = 1 + (buf_size - 4 * ch) / (bsize * ch) * bsamples;
  627.   627         break;
  628.   628     }
  629.   629     case AV_CODEC_ID_ADPCM_MS:
  630.   630         if (avctx->block_align > 0)
  631.   631             buf_size = FFMIN(buf_size, avctx->block_align);
  632.   632         nb_samples = (buf_size - 6 * ch) * 2 / ch;
  633.   633         break;
  634.   634     case AV_CODEC_ID_ADPCM_MTAF:
  635.   635         if (avctx->block_align > 0)
  636.   636             buf_size = FFMIN(buf_size, avctx->block_align);
  637.   637         nb_samples = (buf_size - 16 * (ch / 2)) * 2 / ch;
  638.   638         break;
  639.   639     case AV_CODEC_ID_ADPCM_SBPRO_2:
  640.   640     case AV_CODEC_ID_ADPCM_SBPRO_3:
  641.   641     case AV_CODEC_ID_ADPCM_SBPRO_4:
  642.   642     {
  643.   643         int samples_per_byte;
  644.   644         switch (avctx->codec->id) {
  645.   645         case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;
  646.   646         case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;
  647.   647         case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;
  648.   648         }
  649.   649         if (!s->status[0].step_index) {
  650.   650             if (buf_size < ch)
  651.   651                 return AVERROR_INVALIDDATA;
  652.   652             nb_samples++;
  653.   653             buf_size -= ch;
  654.   654         }
  655.   655         nb_samples += buf_size * samples_per_byte / ch;
  656.   656         break;
  657.   657     }
  658.   658     case AV_CODEC_ID_ADPCM_SWF:
  659.   659     {
  660.   660         int buf_bits       = buf_size * 8 - 2;
  661.   661         int nbits          = (bytestream2_get_byte(gb) >> 6) + 2;
  662.   662         int block_hdr_size = 22 * ch;
  663.   663         int block_size     = block_hdr_size + nbits * ch * 4095;
  664.   664         int nblocks        = buf_bits / block_size;
  665.   665         int bits_left      = buf_bits - nblocks * block_size;
  666.   666         nb_samples         = nblocks * 4096;
  667.   667         if (bits_left >= block_hdr_size)
  668.   668             nb_samples += 1 + (bits_left - block_hdr_size) / (nbits * ch);
  669.   669         break;
  670.   670     }
  671.   671     case AV_CODEC_ID_ADPCM_THP:
  672.   672     case AV_CODEC_ID_ADPCM_THP_LE:
  673.   673         if (avctx->extradata) {
  674.   674             nb_samples = buf_size * 14 / (8 * ch);
  675.   675             break;
  676.   676         }
  677.   677         has_coded_samples = 1;
  678.   678         bytestream2_skip(gb, 4); // channel size
  679.   679         *coded_samples  = (avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE) ?
  680.   680                           bytestream2_get_le32(gb) :
  681.   681                           bytestream2_get_be32(gb);
  682.   682         buf_size       -= 8 + 36 * ch;
  683.   683         buf_size       /= ch;
  684.   684         nb_samples      = buf_size / 8 * 14;
  685.   685         if (buf_size % 8 > 1)
  686.   686             nb_samples     += (buf_size % 8 - 1) * 2;
  687.   687         *approx_nb_samples = 1;
  688.   688         break;
  689.   689     case AV_CODEC_ID_ADPCM_AFC:
  690.   690         nb_samples = buf_size / (9 * ch) * 16;
  691.   691         break;
  692.   692     case AV_CODEC_ID_ADPCM_XA:
  693.   693         nb_samples = (buf_size / 128) * 224 / ch;
  694.   694         break;
  695.   695     case AV_CODEC_ID_ADPCM_DTK:
  696.   696     case AV_CODEC_ID_ADPCM_PSX:
  697.   697         nb_samples = buf_size / (16 * ch) * 28;
  698.   698         break;
  699.   699     }
  700.   700 
  701.   701     /* validate coded sample count */
  702.   702     if (has_coded_samples && (*coded_samples <= 0 || *coded_samples > nb_samples))
  703.   703         return AVERROR_INVALIDDATA;
  704.   704 
  705.   705     return nb_samples;
  706.   706 }
  707.   707 
  708.   708 static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
  709.   709                               int *got_frame_ptr, AVPacket *avpkt)
  710.   710 {
  711.   711     AVFrame *frame     = data;
  712.   712     const uint8_t *buf = avpkt->data;
  713.   713     int buf_size = avpkt->size;
  714.   714     ADPCMDecodeContext *c = avctx->priv_data;
  715.   715     ADPCMChannelStatus *cs;
  716.   716     int n, m, channel, i;
  717.   717     int16_t *samples;
  718.   718     int16_t **samples_p;
  719.   719     int st; /* stereo */
  720.   720     int count1, count2;
  721.   721     int nb_samples, coded_samples, approx_nb_samples, ret;
  722.   722     GetByteContext gb;
  723.   723 
  724.   724     bytestream2_init(&gb, buf, buf_size);
  725.   725     nb_samples = get_nb_samples(avctx, &gb, buf_size, &coded_samples, &approx_nb_samples);
  726.   726     if (nb_samples <= 0) {
  727.   727         av_log(avctx, AV_LOG_ERROR, "invalid number of samples in packet\n");
  728.   728         return AVERROR_INVALIDDATA;
  729.   729     }
  730.   730 
  731.   731     /* get output buffer */
  732.   732     frame->nb_samples = nb_samples;
  733.   733     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
  734.   734         return ret;
  735.   735     samples = (int16_t *)frame->data[0];
  736.   736     samples_p = (int16_t **)frame->extended_data;
  737.   737 
  738.   738     /* use coded_samples when applicable */
  739.   739     /* it is always <= nb_samples, so the output buffer will be large enough */
  740.   740     if (coded_samples) {
  741.   741         if (!approx_nb_samples && coded_samples != nb_samples)
  742.   742             av_log(avctx, AV_LOG_WARNING, "mismatch in coded sample count\n");
  743.   743         frame->nb_samples = nb_samples = coded_samples;
  744.   744     }
  745.   745 
  746.   746     st = avctx->channels == 2 ? 1 : 0;
  747.   747 
  748.   748     switch(avctx->codec->id) {
  749.   749     case AV_CODEC_ID_ADPCM_IMA_QT:
  750.   750         /* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).
  751.   751            Channel data is interleaved per-chunk. */
  752.   752         for (channel = 0; channel < avctx->channels; channel++) {
  753.   753             int predictor;
  754.   754             int step_index;
  755.   755             cs = &(c->status[channel]);
  756.   756             /* (pppppp) (piiiiiii) */
  757.   757 
  758.   758             /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
  759.   759             predictor = sign_extend(bytestream2_get_be16u(&gb), 16);
  760.   760             step_index = predictor & 0x7F;
  761.   761             predictor &= ~0x7F;
  762.   762 
  763.   763             if (cs->step_index == step_index) {
  764.   764                 int diff = predictor - cs->predictor;
  765.   765                 if (diff < 0)
  766.   766                     diff = - diff;
  767.   767                 if (diff > 0x7f)
  768.   768                     goto update;
  769.   769             } else {
  770.   770             update:
  771.   771                 cs->step_index = step_index;
  772.   772                 cs->predictor = predictor;
  773.   773             }
  774.   774 
  775.   775             if (cs->step_index > 88u){
  776.   776                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
  777.   777                        channel, cs->step_index);
  778.   778                 return AVERROR_INVALIDDATA;
  779.   779             }
  780.   780 
  781.   781             samples = samples_p[channel];
  782.   782 
  783.   783             for (m = 0; m < 64; m += 2) {
  784.   784                 int byte = bytestream2_get_byteu(&gb);
  785.   785                 samples[m    ] = adpcm_ima_qt_expand_nibble(cs, byte & 0x0F, 3);
  786.   786                 samples[m + 1] = adpcm_ima_qt_expand_nibble(cs, byte >> 4  , 3);
  787.   787             }
  788.   788         }
  789.   789         break;
  790.   790     case AV_CODEC_ID_ADPCM_IMA_WAV:
  791.   791         for(i=0; i<avctx->channels; i++){
  792.   792             cs = &(c->status[i]);
  793.   793             cs->predictor = samples_p[i][0] = sign_extend(bytestream2_get_le16u(&gb), 16);
  794.   794 
  795.   795             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
  796.   796             if (cs->step_index > 88u){
  797.   797                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
  798.   798                        i, cs->step_index);
  799.   799                 return AVERROR_INVALIDDATA;
  800.   800             }
  801.   801         }
  802.   802 
  803.   803         if (avctx->bits_per_coded_sample != 4) {
  804.   804             int samples_per_block = ff_adpcm_ima_block_samples[avctx->bits_per_coded_sample - 2];
  805.   805             int block_size = ff_adpcm_ima_block_sizes[avctx->bits_per_coded_sample - 2];
  806.   806             uint8_t temp[20 + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 };
  807.   807             GetBitContext g;
  808.   808 
  809.   809             for (n = 0; n < (nb_samples - 1) / samples_per_block; n++) {
  810.   810                 for (i = 0; i < avctx->channels; i++) {
  811.   811                     int j;
  812.   812 
  813.   813                     cs = &c->status[i];
  814.   814                     samples = &samples_p[i][1 + n * samples_per_block];
  815.   815                     for (j = 0; j < block_size; j++) {
  816.   816                         temp[j] = buf[4 * avctx->channels + block_size * n * avctx->channels +
  817.   817                                         (j % 4) + (j / 4) * (avctx->channels * 4) + i * 4];
  818.   818                     }
  819.   819                     ret = init_get_bits8(&g, (const uint8_t *)&temp, block_size);
  820.   820                     if (ret < 0)
  821.   821                         return ret;
  822.   822                     for (m = 0; m < samples_per_block; m++) {
  823.   823                         samples[m] = adpcm_ima_wav_expand_nibble(cs, &g,
  824.   824                                           avctx->bits_per_coded_sample);
  825.   825                     }
  826.   826                 }
  827.   827             }
  828.   828             bytestream2_skip(&gb, avctx->block_align - avctx->channels * 4);
  829.   829         } else {
  830.   830         for (n = 0; n < (nb_samples - 1) / 8; n++) {
  831.   831             for (i = 0; i < avctx->channels; i++) {
  832.   832                 cs = &c->status[i];
  833.   833                 samples = &samples_p[i][1 + n * 8];
  834.   834                 for (m = 0; m < 8; m += 2) {
  835.   835                     int v = bytestream2_get_byteu(&gb);
  836.   836                     samples[m    ] = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);
  837.   837                     samples[m + 1] = adpcm_ima_expand_nibble(cs, v >> 4  , 3);
  838.   838                 }
  839.   839             }
  840.   840         }
  841.   841         }
  842.   842         break;
  843.   843     case AV_CODEC_ID_ADPCM_4XM:
  844.   844         for (i = 0; i < avctx->channels; i++)
  845.   845             c->status[i].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
  846.   846 
  847.   847         for (i = 0; i < avctx->channels; i++) {
  848.   848             c->status[i].step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
  849.   849             if (c->status[i].step_index > 88u) {
  850.   850                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
  851.   851                        i, c->status[i].step_index);
  852.   852                 return AVERROR_INVALIDDATA;
  853.   853             }
  854.   854         }
  855.   855 
  856.   856         for (i = 0; i < avctx->channels; i++) {
  857.   857             samples = (int16_t *)frame->data[i];
  858.   858             cs = &c->status[i];
  859.   859             for (n = nb_samples >> 1; n > 0; n--) {
  860.   860                 int v = bytestream2_get_byteu(&gb);
  861.   861                 *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);
  862.   862                 *samples++ = adpcm_ima_expand_nibble(cs, v >> 4  , 4);
  863.   863             }
  864.   864         }
  865.   865         break;
  866.   866     case AV_CODEC_ID_ADPCM_MS:
  867.   867     {
  868.   868         int block_predictor;
  869.   869 
  870.   870         block_predictor = bytestream2_get_byteu(&gb);
  871.   871         if (block_predictor > 6) {
  872.   872             av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[0] = %d\n",
  873.   873                    block_predictor);
  874.   874             return AVERROR_INVALIDDATA;
  875.   875         }
  876.   876         c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
  877.   877         c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
  878.   878         if (st) {
  879.   879             block_predictor = bytestream2_get_byteu(&gb);
  880.   880             if (block_predictor > 6) {
  881.   881                 av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[1] = %d\n",
  882.   882                        block_predictor);
  883.   883                 return AVERROR_INVALIDDATA;
  884.   884             }
  885.   885             c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
  886.   886             c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
  887.   887         }
  888.   888         c->status[0].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);
  889.   889         if (st){
  890.   890             c->status[1].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);
  891.   891         }
  892.   892 
  893.   893         c->status[0].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);
  894.   894         if (st) c->status[1].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);
  895.   895         c->status[0].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);
  896.   896         if (st) c->status[1].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);
  897.   897 
  898.   898         *samples++ = c->status[0].sample2;
  899.   899         if (st) *samples++ = c->status[1].sample2;
  900.   900         *samples++ = c->status[0].sample1;
  901.   901         if (st) *samples++ = c->status[1].sample1;
  902.   902         for(n = (nb_samples - 2) >> (1 - st); n > 0; n--) {
  903.   903             int byte = bytestream2_get_byteu(&gb);
  904.   904             *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], byte >> 4  );
  905.   905             *samples++ = adpcm_ms_expand_nibble(&c->status[st], byte & 0x0F);
  906.   906         }
  907.   907         break;
  908.   908     }
  909.   909     case AV_CODEC_ID_ADPCM_MTAF:
  910.   910         for (channel = 0; channel < avctx->channels; channel+=2) {
  911.   911             bytestream2_skipu(&gb, 4);
  912.   912             c->status[channel    ].step      = bytestream2_get_le16u(&gb) & 0x1f;
  913.   913             c->status[channel + 1].step      = bytestream2_get_le16u(&gb) & 0x1f;
  914.   914             c->status[channel    ].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
  915.   915             bytestream2_skipu(&gb, 2);
  916.   916             c->status[channel + 1].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
  917.   917             bytestream2_skipu(&gb, 2);
  918.   918             for (n = 0; n < nb_samples; n+=2) {
  919.   919                 int v = bytestream2_get_byteu(&gb);
  920.   920                 samples_p[channel][n    ] = adpcm_mtaf_expand_nibble(&c->status[channel], v & 0x0F);
  921.   921                 samples_p[channel][n + 1] = adpcm_mtaf_expand_nibble(&c->status[channel], v >> 4  );
  922.   922             }
  923.   923             for (n = 0; n < nb_samples; n+=2) {
  924.   924                 int v = bytestream2_get_byteu(&gb);
  925.   925                 samples_p[channel + 1][n    ] = adpcm_mtaf_expand_nibble(&c->status[channel + 1], v & 0x0F);
  926.   926                 samples_p[channel + 1][n + 1] = adpcm_mtaf_expand_nibble(&c->status[channel + 1], v >> 4  );
  927.   927             }
  928.   928         }
  929.   929         break;
  930.   930     case AV_CODEC_ID_ADPCM_IMA_DK4:
  931.   931         for (channel = 0; channel < avctx->channels; channel++) {
  932.   932             cs = &c->status[channel];
  933.   933             cs->predictor  = *samples++ = sign_extend(bytestream2_get_le16u(&gb), 16);
  934.   934             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
  935.   935             if (cs->step_index > 88u){
  936.   936                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
  937.   937                        channel, cs->step_index);
  938.   938                 return AVERROR_INVALIDDATA;
  939.   939             }
  940.   940         }
  941.   941         for (n = (nb_samples - 1) >> (1 - st); n > 0; n--) {
  942.   942             int v = bytestream2_get_byteu(&gb);
  943.   943             *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4  , 3);
  944.   944             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
  945.   945         }
  946.   946         break;
  947.   947     case AV_CODEC_ID_ADPCM_IMA_DK3:
  948.   948     {
  949.   949         int last_byte = 0;
  950.   950         int nibble;
  951.   951         int decode_top_nibble_next = 0;
  952.   952         int diff_channel;
  953.   953         const int16_t *samples_end = samples + avctx->channels * nb_samples;
  954.   954 
  955.   955         bytestream2_skipu(&gb, 10);
  956.   956         c->status[0].predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);
  957.   957         c->status[1].predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);
  958.   958         c->status[0].step_index = bytestream2_get_byteu(&gb);
  959.   959         c->status[1].step_index = bytestream2_get_byteu(&gb);
  960.   960         if (c->status[0].step_index > 88u || c->status[1].step_index > 88u){
  961.   961             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i/%i\n",
  962.   962                    c->status[0].step_index, c->status[1].step_index);
  963.   963             return AVERROR_INVALIDDATA;
  964.   964         }
  965.   965         /* sign extend the predictors */
  966.   966         diff_channel = c->status[1].predictor;
  967.   967 
  968.   968         /* DK3 ADPCM support macro */
  969.   969 #define DK3_GET_NEXT_NIBBLE() \
  970.   970     if (decode_top_nibble_next) { \
  971.   971         nibble = last_byte >> 4; \
  972.   972         decode_top_nibble_next = 0; \
  973.   973     } else { \
  974.   974         last_byte = bytestream2_get_byteu(&gb); \
  975.   975         nibble = last_byte & 0x0F; \
  976.   976         decode_top_nibble_next = 1; \
  977.   977     }
  978.   978 
  979.   979         while (samples < samples_end) {
  980.   980 
  981.   981             /* for this algorithm, c->status[0] is the sum channel and
  982.   982              * c->status[1] is the diff channel */
  983.   983 
  984.   984             /* process the first predictor of the sum channel */
  985.   985             DK3_GET_NEXT_NIBBLE();
  986.   986             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
  987.   987 
  988.   988             /* process the diff channel predictor */
  989.   989             DK3_GET_NEXT_NIBBLE();
  990.   990             adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
  991.   991 
  992.   992             /* process the first pair of stereo PCM samples */
  993.   993             diff_channel = (diff_channel + c->status[1].predictor) / 2;
  994.   994             *samples++ = c->status[0].predictor + c->status[1].predictor;
  995.   995             *samples++ = c->status[0].predictor - c->status[1].predictor;
  996.   996 
  997.   997             /* process the second predictor of the sum channel */
  998.   998             DK3_GET_NEXT_NIBBLE();
  999.   999             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
  1000.  1000 
  1001.  1001             /* process the second pair of stereo PCM samples */
  1002.  1002             diff_channel = (diff_channel + c->status[1].predictor) / 2;
  1003.  1003             *samples++ = c->status[0].predictor + c->status[1].predictor;
  1004.  1004             *samples++ = c->status[0].predictor - c->status[1].predictor;
  1005.  1005         }
  1006.  1006 
  1007.  1007         if ((bytestream2_tell(&gb) & 1))
  1008.  1008             bytestream2_skip(&gb, 1);
  1009.  1009         break;
  1010.  1010     }
  1011.  1011     case AV_CODEC_ID_ADPCM_IMA_ISS:
  1012.  1012         for (channel = 0; channel < avctx->channels; channel++) {
  1013.  1013             cs = &c->status[channel];
  1014.  1014             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);
  1015.  1015             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
  1016.  1016             if (cs->step_index > 88u){
  1017.  1017                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
  1018.  1018                        channel, cs->step_index);
  1019.  1019                 return AVERROR_INVALIDDATA;
  1020.  1020             }
  1021.  1021         }
  1022.  1022 
  1023.  1023         for (n = nb_samples >> (1 - st); n > 0; n--) {
  1024.  1024             int v1, v2;
  1025.  1025             int v = bytestream2_get_byteu(&gb);
  1026.  1026             /* nibbles are swapped for mono */
  1027.  1027             if (st) {
  1028.  1028                 v1 = v >> 4;
  1029.  1029                 v2 = v & 0x0F;
  1030.  1030             } else {
  1031.  1031                 v2 = v >> 4;
  1032.  1032                 v1 = v & 0x0F;
  1033.  1033             }
  1034.  1034             *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);
  1035.  1035             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);
  1036.  1036         }
  1037.  1037         break;
  1038.  1038     case AV_CODEC_ID_ADPCM_IMA_DAT4:
  1039.  1039         for (channel = 0; channel < avctx->channels; channel++) {
  1040.  1040             cs = &c->status[channel];
  1041.  1041             samples = samples_p[channel];
  1042.  1042             bytestream2_skip(&gb, 4);
  1043.  1043             for (n = 0; n < nb_samples; n += 2) {
  1044.  1044                 int v = bytestream2_get_byteu(&gb);
  1045.  1045                 *samples++ = adpcm_ima_expand_nibble(cs, v >> 4  , 3);
  1046.  1046                 *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);
  1047.  1047             }
  1048.  1048         }
  1049.  1049         break;
  1050.  1050     case AV_CODEC_ID_ADPCM_IMA_APC:
  1051.  1051         while (bytestream2_get_bytes_left(&gb) > 0) {
  1052.  1052             int v = bytestream2_get_byteu(&gb);
  1053.  1053             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  v >> 4  , 3);
  1054.  1054             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
  1055.  1055         }
  1056.  1056         break;
  1057.  1057     case AV_CODEC_ID_ADPCM_IMA_OKI:
  1058.  1058         while (bytestream2_get_bytes_left(&gb) > 0) {
  1059.  1059             int v = bytestream2_get_byteu(&gb);
  1060.  1060             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[0],  v >> 4  );
  1061.  1061             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[st], v & 0x0F);
  1062.  1062         }
  1063.  1063         break;
  1064.  1064     case AV_CODEC_ID_ADPCM_IMA_RAD:
  1065.  1065         for (channel = 0; channel < avctx->channels; channel++) {
  1066.  1066             cs = &c->status[channel];
  1067.  1067             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
  1068.  1068             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);
  1069.  1069             if (cs->step_index > 88u){
  1070.  1070                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
  1071.  1071                        channel, cs->step_index);
  1072.  1072                 return AVERROR_INVALIDDATA;
  1073.  1073             }
  1074.  1074         }
  1075.  1075         for (n = 0; n < nb_samples / 2; n++) {
  1076.  1076             int byte[2];
  1077.  1077 
  1078.  1078             byte[0] = bytestream2_get_byteu(&gb);
  1079.  1079             if (st)
  1080.  1080                 byte[1] = bytestream2_get_byteu(&gb);
  1081.  1081             for(channel = 0; channel < avctx->channels; channel++) {
  1082.  1082                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] & 0x0F, 3);
  1083.  1083             }
  1084.  1084             for(channel = 0; channel < avctx->channels; channel++) {
  1085.  1085                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] >> 4  , 3);
  1086.  1086             }
  1087.  1087         }
  1088.  1088         break;
  1089.  1089     case AV_CODEC_ID_ADPCM_IMA_WS:
  1090.  1090         if (c->vqa_version == 3) {
  1091.  1091             for (channel = 0; channel < avctx->channels; channel++) {
  1092.  1092                 int16_t *smp = samples_p[channel];
  1093.  1093 
  1094.  1094                 for (n = nb_samples / 2; n > 0; n--) {
  1095.  1095                     int v = bytestream2_get_byteu(&gb);
  1096.  1096                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);
  1097.  1097                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
  1098.  1098                 }
  1099.  1099             }
  1100.  1100         } else {
  1101.  1101             for (n = nb_samples / 2; n > 0; n--) {
  1102.  1102                 for (channel = 0; channel < avctx->channels; channel++) {
  1103.  1103                     int v = bytestream2_get_byteu(&gb);
  1104.  1104                     *samples++  = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);
  1105.  1105                     samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
  1106.  1106                 }
  1107.  1107                 samples += avctx->channels;
  1108.  1108             }
  1109.  1109         }
  1110.  1110         bytestream2_seek(&gb, 0, SEEK_END);
  1111.  1111         break;
  1112.  1112     case AV_CODEC_ID_ADPCM_XA:
  1113.  1113     {
  1114.  1114         int16_t *out0 = samples_p[0];
  1115.  1115         int16_t *out1 = samples_p[1];
  1116.  1116         int samples_per_block = 28 * (3 - avctx->channels) * 4;
  1117.  1117         int sample_offset = 0;
  1118.  1118         while (bytestream2_get_bytes_left(&gb) >= 128) {
  1119.  1119             if ((ret = xa_decode(avctx, out0, out1, buf + bytestream2_tell(&gb),
  1120.  1120                                  &c->status[0], &c->status[1],
  1121.  1121                                  avctx->channels, sample_offset)) < 0)
  1122.  1122                 return ret;
  1123.  1123             bytestream2_skipu(&gb, 128);
  1124.  1124             sample_offset += samples_per_block;
  1125.  1125         }
  1126.  1126         break;
  1127.  1127     }
  1128.  1128     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:
  1129.  1129         for (i=0; i<=st; i++) {
  1130.  1130             c->status[i].step_index = bytestream2_get_le32u(&gb);
  1131.  1131             if (c->status[i].step_index > 88u) {
  1132.  1132                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
  1133.  1133                        i, c->status[i].step_index);
  1134.  1134                 return AVERROR_INVALIDDATA;
  1135.  1135             }
  1136.  1136         }
  1137.  1137         for (i=0; i<=st; i++)
  1138.  1138             c->status[i].predictor  = bytestream2_get_le32u(&gb);
  1139.  1139 
  1140.  1140         for (n = nb_samples >> (1 - st); n > 0; n--) {
  1141.  1141             int byte   = bytestream2_get_byteu(&gb);
  1142.  1142             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   3);
  1143.  1143             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);
  1144.  1144         }
  1145.  1145         break;
  1146.  1146     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
  1147.  1147         for (n = nb_samples >> (1 - st); n > 0; n--) {
  1148.  1148             int byte = bytestream2_get_byteu(&gb);
  1149.  1149             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   6);
  1150.  1150             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);
  1151.  1151         }
  1152.  1152         break;
  1153.  1153     case AV_CODEC_ID_ADPCM_EA:
  1154.  1154     {
  1155.  1155         int previous_left_sample, previous_right_sample;
  1156.  1156         int current_left_sample, current_right_sample;
  1157.  1157         int next_left_sample, next_right_sample;
  1158.  1158         int coeff1l, coeff2l, coeff1r, coeff2r;
  1159.  1159         int shift_left, shift_right;
  1160.  1160 
  1161.  1161         /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,
  1162.  1162            each coding 28 stereo samples. */
  1163.  1163 
  1164.  1164         if(avctx->channels != 2)
  1165.  1165             return AVERROR_INVALIDDATA;
  1166.  1166 
  1167.  1167         current_left_sample   = sign_extend(bytestream2_get_le16u(&gb), 16);
  1168.  1168         previous_left_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);
  1169.  1169         current_right_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);
  1170.  1170         previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);
  1171.  1171 
  1172.  1172         for (count1 = 0; count1 < nb_samples / 28; count1++) {
  1173.  1173             int byte = bytestream2_get_byteu(&gb);
  1174.  1174             coeff1l = ea_adpcm_table[ byte >> 4       ];
  1175.  1175             coeff2l = ea_adpcm_table[(byte >> 4  ) + 4];
  1176.  1176             coeff1r = ea_adpcm_table[ byte & 0x0F];
  1177.  1177             coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];
  1178.  1178 
  1179.  1179             byte = bytestream2_get_byteu(&gb);
  1180.  1180             shift_left  = 20 - (byte >> 4);
  1181.  1181             shift_right = 20 - (byte & 0x0F);
  1182.  1182 
  1183.  1183             for (count2 = 0; count2 < 28; count2++) {
  1184.  1184                 byte = bytestream2_get_byteu(&gb);
  1185.  1185                 next_left_sample  = sign_extend(byte >> 4, 4) << shift_left;
  1186.  1186                 next_right_sample = sign_extend(byte,      4) << shift_right;
  1187.  1187 
  1188.  1188                 next_left_sample = (next_left_sample +
  1189.  1189                     (current_left_sample * coeff1l) +
  1190.  1190                     (previous_left_sample * coeff2l) + 0x80) >> 8;
  1191.  1191                 next_right_sample = (next_right_sample +
  1192.  1192                     (current_right_sample * coeff1r) +
  1193.  1193                     (previous_right_sample * coeff2r) + 0x80) >> 8;
  1194.  1194 
  1195.  1195                 previous_left_sample = current_left_sample;
  1196.  1196                 current_left_sample = av_clip_int16(next_left_sample);
  1197.  1197                 previous_right_sample = current_right_sample;
  1198.  1198                 current_right_sample = av_clip_int16(next_right_sample);
  1199.  1199                 *samples++ = current_left_sample;
  1200.  1200                 *samples++ = current_right_sample;
  1201.  1201             }
  1202.  1202         }
  1203.  1203 
  1204.  1204         bytestream2_skip(&gb, 2); // Skip terminating 0x0000
  1205.  1205 
  1206.  1206         break;
  1207.  1207     }
  1208.  1208     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:
  1209.  1209     {
  1210.  1210         int coeff[2][2], shift[2];
  1211.  1211 
  1212.  1212         for(channel = 0; channel < avctx->channels; channel++) {
  1213.  1213             int byte = bytestream2_get_byteu(&gb);
  1214.  1214             for (i=0; i<2; i++)
  1215.  1215                 coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];
  1216.  1216             shift[channel] = 20 - (byte & 0x0F);
  1217.  1217         }
  1218.  1218         for (count1 = 0; count1 < nb_samples / 2; count1++) {
  1219.  1219             int byte[2];
  1220.  1220 
  1221.  1221             byte[0] = bytestream2_get_byteu(&gb);
  1222.  1222             if (st) byte[1] = bytestream2_get_byteu(&gb);
  1223.  1223             for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */
  1224.  1224                 for(channel = 0; channel < avctx->channels; channel++) {
  1225.  1225                     int sample = sign_extend(byte[channel] >> i, 4) << shift[channel];
  1226.  1226                     sample = (sample +
  1227.  1227                              c->status[channel].sample1 * coeff[channel][0] +
  1228.  1228                              c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;
  1229.  1229                     c->status[channel].sample2 = c->status[channel].sample1;
  1230.  1230                     c->status[channel].sample1 = av_clip_int16(sample);
  1231.  1231                     *samples++ = c->status[channel].sample1;
  1232.  1232                 }
  1233.  1233             }
  1234.  1234         }
  1235.  1235         bytestream2_seek(&gb, 0, SEEK_END);
  1236.  1236         break;
  1237.  1237     }
  1238.  1238     case AV_CODEC_ID_ADPCM_EA_R1:
  1239.  1239     case AV_CODEC_ID_ADPCM_EA_R2:
  1240.  1240     case AV_CODEC_ID_ADPCM_EA_R3: {
  1241.  1241         /* channel numbering
  1242.  1242            2chan: 0=fl, 1=fr
  1243.  1243            4chan: 0=fl, 1=rl, 2=fr, 3=rr
  1244.  1244            6chan: 0=fl, 1=c,  2=fr, 3=rl,  4=rr, 5=sub */
  1245.  1245         const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;
  1246.  1246         int previous_sample, current_sample, next_sample;
  1247.  1247         int coeff1, coeff2;
  1248.  1248         int shift;
  1249.  1249         unsigned int channel;
  1250.  1250         uint16_t *samplesC;
  1251.  1251         int count = 0;
  1252.  1252         int offsets[6];
  1253.  1253 
  1254.  1254         for (channel=0; channel<avctx->channels; channel++)
  1255.  1255             offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :
  1256.  1256                                              bytestream2_get_le32(&gb)) +
  1257.  1257                                (avctx->channels + 1) * 4;
  1258.  1258 
  1259.  1259         for (channel=0; channel<avctx->channels; channel++) {
  1260.  1260             bytestream2_seek(&gb, offsets[channel], SEEK_SET);
  1261.  1261             samplesC = samples_p[channel];
  1262.  1262 
  1263.  1263             if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {
  1264.  1264                 current_sample  = sign_extend(bytestream2_get_le16(&gb), 16);
  1265.  1265                 previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);
  1266.  1266             } else {
  1267.  1267                 current_sample  = c->status[channel].predictor;
  1268.  1268                 previous_sample = c->status[channel].prev_sample;
  1269.  1269             }
  1270.  1270 
  1271.  1271             for (count1 = 0; count1 < nb_samples / 28; count1++) {
  1272.  1272                 int byte = bytestream2_get_byte(&gb);
  1273.  1273                 if (byte == 0xEE) {  /* only seen in R2 and R3 */
  1274.  1274                     current_sample  = sign_extend(bytestream2_get_be16(&gb), 16);
  1275.  1275                     previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);
  1276.  1276 
  1277.  1277                     for (count2=0; count2<28; count2++)
  1278.  1278                         *samplesC++ = sign_extend(bytestream2_get_be16(&gb), 16);
  1279.  1279                 } else {
  1280.  1280                     coeff1 = ea_adpcm_table[ byte >> 4     ];
  1281.  1281                     coeff2 = ea_adpcm_table[(byte >> 4) + 4];
  1282.  1282                     shift = 20 - (byte & 0x0F);
  1283.  1283 
  1284.  1284                     for (count2=0; count2<28; count2++) {
  1285.  1285                         if (count2 & 1)
  1286.  1286                             next_sample = sign_extend(byte,    4) << shift;
  1287.  1287                         else {
  1288.  1288                             byte = bytestream2_get_byte(&gb);
  1289.  1289                             next_sample = sign_extend(byte >> 4, 4) << shift;
  1290.  1290                         }
  1291.  1291 
  1292.  1292                         next_sample += (current_sample  * coeff1) +
  1293.  1293                                        (previous_sample * coeff2);
  1294.  1294                         next_sample = av_clip_int16(next_sample >> 8);
  1295.  1295 
  1296.  1296                         previous_sample = current_sample;
  1297.  1297                         current_sample  = next_sample;
  1298.  1298                         *samplesC++ = current_sample;
  1299.  1299                     }
  1300.  1300                 }
  1301.  1301             }
  1302.  1302             if (!count) {
  1303.  1303                 count = count1;
  1304.  1304             } else if (count != count1) {
  1305.  1305                 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");
  1306.  1306                 count = FFMAX(count, count1);
  1307.  1307             }
  1308.  1308 
  1309.  1309             if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {
  1310.  1310                 c->status[channel].predictor   = current_sample;
  1311.  1311                 c->status[channel].prev_sample = previous_sample;
  1312.  1312             }
  1313.  1313         }
  1314.  1314 
  1315.  1315         frame->nb_samples = count * 28;
  1316.  1316         bytestream2_seek(&gb, 0, SEEK_END);
  1317.  1317         break;
  1318.  1318     }
  1319.  1319     case AV_CODEC_ID_ADPCM_EA_XAS:
  1320.  1320         for (channel=0; channel<avctx->channels; channel++) {
  1321.  1321             int coeff[2][4], shift[4];
  1322.  1322             int16_t *s = samples_p[channel];
  1323.  1323             for (n = 0; n < 4; n++, s += 32) {
  1324.  1324                 int val = sign_extend(bytestream2_get_le16u(&gb), 16);
  1325.  1325                 for (i=0; i<2; i++)
  1326.  1326                     coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];
  1327.  1327                 s[0] = val & ~0x0F;
  1328.  1328 
  1329.  1329                 val = sign_extend(bytestream2_get_le16u(&gb), 16);
  1330.  1330                 shift[n] = 20 - (val & 0x0F);
  1331.  1331                 s[1] = val & ~0x0F;
  1332.  1332             }
  1333.  1333 
  1334.  1334             for (m=2; m<32; m+=2) {
  1335.  1335                 s = &samples_p[channel][m];
  1336.  1336                 for (n = 0; n < 4; n++, s += 32) {
  1337.  1337                     int level, pred;
  1338.  1338                     int byte = bytestream2_get_byteu(&gb);
  1339.  1339 
  1340.  1340                     level = sign_extend(byte >> 4, 4) << shift[n];
  1341.  1341                     pred  = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];
  1342.  1342                     s[0]  = av_clip_int16((level + pred + 0x80) >> 8);
  1343.  1343 
  1344.  1344                     level = sign_extend(byte, 4) << shift[n];
  1345.  1345                     pred  = s[0] * coeff[0][n] + s[-1] * coeff[1][n];
  1346.  1346                     s[1]  = av_clip_int16((level + pred + 0x80) >> 8);
  1347.  1347                 }
  1348.  1348             }
  1349.  1349         }
  1350.  1350         break;
  1351.  1351     case AV_CODEC_ID_ADPCM_IMA_AMV:
  1352.  1352         c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
  1353.  1353         c->status[0].step_index = bytestream2_get_byteu(&gb);
  1354.  1354         bytestream2_skipu(&gb, 5);
  1355.  1355         if (c->status[0].step_index > 88u) {
  1356.  1356             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",
  1357.  1357                    c->status[0].step_index);
  1358.  1358             return AVERROR_INVALIDDATA;
  1359.  1359         }
  1360.  1360 
  1361.  1361         for (n = nb_samples >> (1 - st); n > 0; n--) {
  1362.  1362             int v = bytestream2_get_byteu(&gb);
  1363.  1363 
  1364.  1364             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);
  1365.  1365             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);
  1366.  1366         }
  1367.  1367         break;
  1368.  1368     case AV_CODEC_ID_ADPCM_IMA_SMJPEG:
  1369.  1369         for (i = 0; i < avctx->channels; i++) {
  1370.  1370             c->status[i].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);
  1371.  1371             c->status[i].step_index = bytestream2_get_byteu(&gb);
  1372.  1372             bytestream2_skipu(&gb, 1);
  1373.  1373             if (c->status[i].step_index > 88u) {
  1374.  1374                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",
  1375.  1375                        c->status[i].step_index);
  1376.  1376                 return AVERROR_INVALIDDATA;
  1377.  1377             }
  1378.  1378         }
  1379.  1379 
  1380.  1380         for (n = nb_samples >> (1 - st); n > 0; n--) {
  1381.  1381             int v = bytestream2_get_byteu(&gb);
  1382.  1382 
  1383.  1383             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[0 ], v >> 4, 3);
  1384.  1384             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0xf, 3);
  1385.  1385         }
  1386.  1386         break;
  1387.  1387     case AV_CODEC_ID_ADPCM_CT:
  1388.  1388         for (n = nb_samples >> (1 - st); n > 0; n--) {
  1389.  1389             int v = bytestream2_get_byteu(&gb);
  1390.  1390             *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4  );
  1391.  1391             *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);
  1392.  1392         }
  1393.  1393         break;
  1394.  1394     case AV_CODEC_ID_ADPCM_SBPRO_4:
  1395.  1395     case AV_CODEC_ID_ADPCM_SBPRO_3:
  1396.  1396     case AV_CODEC_ID_ADPCM_SBPRO_2:
  1397.  1397         if (!c->status[0].step_index) {
  1398.  1398             /* the first byte is a raw sample */
  1399.  1399             *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);
  1400.  1400             if (st)
  1401.  1401                 *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);
  1402.  1402             c->status[0].step_index = 1;
  1403.  1403             nb_samples--;
  1404.  1404         }
  1405.  1405         if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {
  1406.  1406             for (n = nb_samples >> (1 - st); n > 0; n--) {
  1407.  1407                 int byte = bytestream2_get_byteu(&gb);
  1408.  1408                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
  1409.  1409                                                        byte >> 4,   4, 0);
  1410.  1410                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
  1411.  1411                                                        byte & 0x0F, 4, 0);
  1412.  1412             }
  1413.  1413         } else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {
  1414.  1414             for (n = (nb_samples<<st) / 3; n > 0; n--) {
  1415.  1415                 int byte = bytestream2_get_byteu(&gb);
  1416.  1416                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
  1417.  1417                                                         byte >> 5        , 3, 0);
  1418.  1418                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
  1419.  1419                                                        (byte >> 2) & 0x07, 3, 0);
  1420.  1420                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
  1421.  1421                                                         byte & 0x03,       2, 0);
  1422.  1422             }
  1423.  1423         } else {
  1424.  1424             for (n = nb_samples >> (2 - st); n > 0; n--) {
  1425.  1425                 int byte = bytestream2_get_byteu(&gb);
  1426.  1426                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
  1427.  1427                                                         byte >> 6        , 2, 2);
  1428.  1428                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
  1429.  1429                                                        (byte >> 4) & 0x03, 2, 2);
  1430.  1430                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
  1431.  1431                                                        (byte >> 2) & 0x03, 2, 2);
  1432.  1432                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
  1433.  1433                                                         byte & 0x03,       2, 2);
  1434.  1434             }
  1435.  1435         }
  1436.  1436         break;
  1437.  1437     case AV_CODEC_ID_ADPCM_SWF:
  1438.  1438         adpcm_swf_decode(avctx, buf, buf_size, samples);
  1439.  1439         bytestream2_seek(&gb, 0, SEEK_END);
  1440.  1440         break;
  1441.  1441     case AV_CODEC_ID_ADPCM_YAMAHA:
  1442.  1442         for (n = nb_samples >> (1 - st); n > 0; n--) {
  1443.  1443             int v = bytestream2_get_byteu(&gb);
  1444.  1444             *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);
  1445.  1445             *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4  );
  1446.  1446         }
  1447.  1447         break;
  1448.  1448     case AV_CODEC_ID_ADPCM_AICA:
  1449.  1449         if (!c->has_status) {
  1450.  1450             for (channel = 0; channel < avctx->channels; channel++)
  1451.  1451                 c->status[channel].step = 0;
  1452.  1452             c->has_status = 1;
  1453.  1453         }
  1454.  1454         for (channel = 0; channel < avctx->channels; channel++) {
  1455.  1455             samples = samples_p[channel];
  1456.  1456             for (n = nb_samples >> 1; n > 0; n--) {
  1457.  1457                 int v = bytestream2_get_byteu(&gb);
  1458.  1458                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v & 0x0F);
  1459.  1459                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v >> 4  );
  1460.  1460             }
  1461.  1461         }
  1462.  1462         break;
  1463.  1463     case AV_CODEC_ID_ADPCM_AFC:
  1464.  1464     {
  1465.  1465         int samples_per_block;
  1466.  1466         int blocks;
  1467.  1467 
  1468.  1468         if (avctx->extradata && avctx->extradata_size == 1 && avctx->extradata[0]) {
  1469.  1469             samples_per_block = avctx->extradata[0] / 16;
  1470.  1470             blocks = nb_samples / avctx->extradata[0];
  1471.  1471         } else {
  1472.  1472             samples_per_block = nb_samples / 16;
  1473.  1473             blocks = 1;
  1474.  1474         }
  1475.  1475 
  1476.  1476         for (m = 0; m < blocks; m++) {
  1477.  1477         for (channel = 0; channel < avctx->channels; channel++) {
  1478.  1478             int prev1 = c->status[channel].sample1;
  1479.  1479             int prev2 = c->status[channel].sample2;
  1480.  1480 
  1481.  1481             samples = samples_p[channel] + m * 16;
  1482.  1482             /* Read in every sample for this channel.  */
  1483.  1483             for (i = 0; i < samples_per_block; i++) {
  1484.  1484                 int byte = bytestream2_get_byteu(&gb);
  1485.  1485                 int scale = 1 << (byte >> 4);
  1486.  1486                 int index = byte & 0xf;
  1487.  1487                 int factor1 = ff_adpcm_afc_coeffs[0][index];
  1488.  1488                 int factor2 = ff_adpcm_afc_coeffs[1][index];
  1489.  1489 
  1490.  1490                 /* Decode 16 samples.  */
  1491.  1491                 for (n = 0; n < 16; n++) {
  1492.  1492                     int32_t sampledat;
  1493.  1493 
  1494.  1494                     if (n & 1) {
  1495.  1495                         sampledat = sign_extend(byte, 4);
  1496.  1496                     } else {
  1497.  1497                         byte = bytestream2_get_byteu(&gb);
  1498.  1498                         sampledat = sign_extend(byte >> 4, 4);
  1499.  1499                     }
  1500.  1500 
  1501.  1501                     sampledat = ((prev1 * factor1 + prev2 * factor2) +
  1502.  1502                                  ((sampledat * scale) << 11)) >> 11;
  1503.  1503                     *samples = av_clip_int16(sampledat);
  1504.  1504                     prev2 = prev1;
  1505.  1505                     prev1 = *samples++;
  1506.  1506                 }
  1507.  1507             }
  1508.  1508 
  1509.  1509             c->status[channel].sample1 = prev1;
  1510.  1510             c->status[channel].sample2 = prev2;
  1511.  1511         }
  1512.  1512         }
  1513.  1513         bytestream2_seek(&gb, 0, SEEK_END);
  1514.  1514         break;
  1515.  1515     }
  1516.  1516     case AV_CODEC_ID_ADPCM_THP:
  1517.  1517     case AV_CODEC_ID_ADPCM_THP_LE:
  1518.  1518     {
  1519.  1519         int table[14][16];
  1520.  1520         int ch;
  1521.  1521 
  1522.  1522 #define THP_GET16(g) \
  1523.  1523     sign_extend( \
  1524.  1524         avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE ? \
  1525.  1525         bytestream2_get_le16u(&(g)) : \
  1526.  1526         bytestream2_get_be16u(&(g)), 16)
  1527.  1527 
  1528.  1528         if (avctx->extradata) {
  1529.  1529             GetByteContext tb;
  1530.  1530             if (avctx->extradata_size < 32 * avctx->channels) {
  1531.  1531                 av_log(avctx, AV_LOG_ERROR, "Missing coeff table\n");
  1532.  1532                 return AVERROR_INVALIDDATA;
  1533.  1533             }
  1534.  1534 
  1535.  1535             bytestream2_init(&tb, avctx->extradata, avctx->extradata_size);
  1536.  1536             for (i = 0; i < avctx->channels; i++)
  1537.  1537                 for (n = 0; n < 16; n++)
  1538.  1538                     table[i][n] = THP_GET16(tb);
  1539.  1539         } else {
  1540.  1540             for (i = 0; i < avctx->channels; i++)
  1541.  1541                 for (n = 0; n < 16; n++)
  1542.  1542                     table[i][n] = THP_GET16(gb);
  1543.  1543 
  1544.  1544             if (!c->has_status) {
  1545.  1545                 /* Initialize the previous sample.  */
  1546.  1546                 for (i = 0; i < avctx->channels; i++) {
  1547.  1547                     c->status[i].sample1 = THP_GET16(gb);
  1548.  1548                     c->status[i].sample2 = THP_GET16(gb);
  1549.  1549                 }
  1550.  1550                 c->has_status = 1;
  1551.  1551             } else {
  1552.  1552                 bytestream2_skip(&gb, avctx->channels * 4);
  1553.  1553             }
  1554.  1554         }
  1555.  1555 
  1556.  1556         for (ch = 0; ch < avctx->channels; ch++) {
  1557.  1557             samples = samples_p[ch];
  1558.  1558 
  1559.  1559             /* Read in every sample for this channel.  */
  1560.  1560             for (i = 0; i < (nb_samples + 13) / 14; i++) {
  1561.  1561                 int byte = bytestream2_get_byteu(&gb);
  1562.  1562                 int index = (byte >> 4) & 7;
  1563.  1563                 unsigned int exp = byte & 0x0F;
  1564.  1564                 int factor1 = table[ch][index * 2];
  1565.  1565                 int factor2 = table[ch][index * 2 + 1];
  1566.  1566 
  1567.  1567                 /* Decode 14 samples.  */
  1568.  1568                 for (n = 0; n < 14 && (i * 14 + n < nb_samples); n++) {
  1569.  1569                     int32_t sampledat;
  1570.  1570 
  1571.  1571                     if (n & 1) {
  1572.  1572                         sampledat = sign_extend(byte, 4);
  1573.  1573                     } else {
  1574.  1574                         byte = bytestream2_get_byteu(&gb);
  1575.  1575                         sampledat = sign_extend(byte >> 4, 4);
  1576.  1576                     }
  1577.  1577 
  1578.  1578                     sampledat = ((c->status[ch].sample1 * factor1
  1579.  1579                                 + c->status[ch].sample2 * factor2) >> 11) + (sampledat << exp);
  1580.  1580                     *samples = av_clip_int16(sampledat);
  1581.  1581                     c->status[ch].sample2 = c->status[ch].sample1;
  1582.  1582                     c->status[ch].sample1 = *samples++;
  1583.  1583                 }
  1584.  1584             }
  1585.  1585         }
  1586.  1586         break;
  1587.  1587     }
  1588.  1588     case AV_CODEC_ID_ADPCM_DTK:
  1589.  1589         for (channel = 0; channel < avctx->channels; channel++) {
  1590.  1590             samples = samples_p[channel];
  1591.  1591 
  1592.  1592             /* Read in every sample for this channel.  */
  1593.  1593             for (i = 0; i < nb_samples / 28; i++) {
  1594.  1594                 int byte, header;
  1595.  1595                 if (channel)
  1596.  1596                     bytestream2_skipu(&gb, 1);
  1597.  1597                 header = bytestream2_get_byteu(&gb);
  1598.  1598                 bytestream2_skipu(&gb, 3 - channel);
  1599.  1599 
  1600.  1600                 /* Decode 28 samples.  */
  1601.  1601                 for (n = 0; n < 28; n++) {
  1602.  1602                     int32_t sampledat, prev;
  1603.  1603 
  1604.  1604                     switch (header >> 4) {
  1605.  1605                     case 1:
  1606.  1606                         prev = (c->status[channel].sample1 * 0x3c);
  1607.  1607                         break;
  1608.  1608                     case 2:
  1609.  1609                         prev = (c->status[channel].sample1 * 0x73) - (c->status[channel].sample2 * 0x34);
  1610.  1610                         break;
  1611.  1611                     case 3:
  1612.  1612                         prev = (c->status[channel].sample1 * 0x62) - (c->status[channel].sample2 * 0x37);
  1613.  1613                         break;
  1614.  1614                     default:
  1615.  1615                         prev = 0;
  1616.  1616                     }
  1617.  1617 
  1618.  1618                     prev = av_clip_intp2((prev + 0x20) >> 6, 21);
  1619.  1619 
  1620.  1620                     byte = bytestream2_get_byteu(&gb);
  1621.  1621                     if (!channel)
  1622.  1622                         sampledat = sign_extend(byte, 4);
  1623.  1623                     else
  1624.  1624                         sampledat = sign_extend(byte >> 4, 4);
  1625.  1625 
  1626.  1626                     sampledat = (((sampledat << 12) >> (header & 0xf)) << 6) + prev;
  1627.  1627                     *samples++ = av_clip_int16(sampledat >> 6);
  1628.  1628                     c->status[channel].sample2 = c->status[channel].sample1;
  1629.  1629                     c->status[channel].sample1 = sampledat;
  1630.  1630                 }
  1631.  1631             }
  1632.  1632             if (!channel)
  1633.  1633                 bytestream2_seek(&gb, 0, SEEK_SET);
  1634.  1634         }
  1635.  1635         break;
  1636.  1636     case AV_CODEC_ID_ADPCM_PSX:
  1637.  1637         for (channel = 0; channel < avctx->channels; channel++) {
  1638.  1638             samples = samples_p[channel];
  1639.  1639 
  1640.  1640             /* Read in every sample for this channel.  */
  1641.  1641             for (i = 0; i < nb_samples / 28; i++) {
  1642.  1642                 int filter, shift, flag, byte;
  1643.  1643 
  1644.  1644                 filter = bytestream2_get_byteu(&gb);
  1645.  1645                 shift  = filter & 0xf;
  1646.  1646                 filter = filter >> 4;
  1647.  1647                 if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table))
  1648.  1648                     return AVERROR_INVALIDDATA;
  1649.  1649                 flag   = bytestream2_get_byteu(&gb);
  1650.  1650 
  1651.  1651                 /* Decode 28 samples.  */
  1652.  1652                 for (n = 0; n < 28; n++) {
  1653.  1653                     int sample = 0, scale;
  1654.  1654 
  1655.  1655                     if (flag < 0x07) {
  1656.  1656                         if (n & 1) {
  1657.  1657                             scale = sign_extend(byte >> 4, 4);
  1658.  1658                         } else {
  1659.  1659                             byte  = bytestream2_get_byteu(&gb);
  1660.  1660                             scale = sign_extend(byte, 4);
  1661.  1661                         }
  1662.  1662 
  1663.  1663                         scale  = scale << 12;
  1664.  1664                         sample = (int)((scale >> shift) + (c->status[channel].sample1 * xa_adpcm_table[filter][0] + c->status[channel].sample2 * xa_adpcm_table[filter][1]) / 64);
  1665.  1665                     }
  1666.  1666                     *samples++ = av_clip_int16(sample);
  1667.  1667                     c->status[channel].sample2 = c->status[channel].sample1;
  1668.  1668                     c->status[channel].sample1 = sample;
  1669.  1669                 }
  1670.  1670             }
  1671.  1671         }
  1672.  1672         break;
  1673.  1673 
  1674.  1674     default:
  1675.  1675         return -1;
  1676.  1676     }
  1677.  1677 
  1678.  1678     if (avpkt->size && bytestream2_tell(&gb) == 0) {
  1679.  1679         av_log(avctx, AV_LOG_ERROR, "Nothing consumed\n");
  1680.  1680         return AVERROR_INVALIDDATA;
  1681.  1681     }
  1682.  1682 
  1683.  1683     *got_frame_ptr = 1;
  1684.  1684 
  1685.  1685     if (avpkt->size < bytestream2_tell(&gb)) {
  1686.  1686         av_log(avctx, AV_LOG_ERROR, "Overread of %d < %d\n", avpkt->size, bytestream2_tell(&gb));
  1687.  1687         return avpkt->size;
  1688.  1688     }
  1689.  1689 
  1690.  1690     return bytestream2_tell(&gb);
  1691.  1691 }
  1692.  1692 
  1693.  1693 static void adpcm_flush(AVCodecContext *avctx)
  1694.  1694 {
  1695.  1695     ADPCMDecodeContext *c = avctx->priv_data;
  1696.  1696     c->has_status = 0;
  1697.  1697 }
  1698.  1698 
  1699.  1699 
  1700.  1700 static const enum AVSampleFormat sample_fmts_s16[]  = { AV_SAMPLE_FMT_S16,
  1701.  1701                                                         AV_SAMPLE_FMT_NONE };
  1702.  1702 static const enum AVSampleFormat sample_fmts_s16p[] = { AV_SAMPLE_FMT_S16P,
  1703.  1703                                                         AV_SAMPLE_FMT_NONE };
  1704.  1704 static const enum AVSampleFormat sample_fmts_both[] = { AV_SAMPLE_FMT_S16,
  1705.  1705                                                         AV_SAMPLE_FMT_S16P,
  1706.  1706                                                         AV_SAMPLE_FMT_NONE };
  1707.  1707 
  1708.  1708 #define ADPCM_DECODER(id_, sample_fmts_, name_, long_name_) \
  1709.  1709 AVCodec ff_ ## name_ ## _decoder = {                        \
  1710.  1710     .name           = #name_,                               \
  1711.  1711     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
  1712.  1712     .type           = AVMEDIA_TYPE_AUDIO,                   \
  1713.  1713     .id             = id_,                                  \
  1714.  1714     .priv_data_size = sizeof(ADPCMDecodeContext),           \
  1715.  1715     .init           = adpcm_decode_init,                    \
  1716.  1716     .decode         = adpcm_decode_frame,                   \
  1717.  1717     .flush          = adpcm_flush,                          \
  1718.  1718     .capabilities   = AV_CODEC_CAP_DR1,                     \
  1719.  1719     .sample_fmts    = sample_fmts_,                         \
  1720.  1720 }
  1721.  1721 
  1722.  1722 /* Note: Do not forget to add new entries to the Makefile as well. */
  1723.  1723 ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM,         sample_fmts_s16p, adpcm_4xm,         "ADPCM 4X Movie");
  1724.  1724 ADPCM_DECODER(AV_CODEC_ID_ADPCM_AFC,         sample_fmts_s16p, adpcm_afc,         "ADPCM Nintendo Gamecube AFC");
  1725.  1725 ADPCM_DECODER(AV_CODEC_ID_ADPCM_AICA,        sample_fmts_s16p, adpcm_aica,        "ADPCM Yamaha AICA");
  1726.  1726 ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT,          sample_fmts_s16,  adpcm_ct,          "ADPCM Creative Technology");
  1727.  1727 ADPCM_DECODER(AV_CODEC_ID_ADPCM_DTK,         sample_fmts_s16p, adpcm_dtk,         "ADPCM Nintendo Gamecube DTK");
  1728.  1728 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA,          sample_fmts_s16,  adpcm_ea,          "ADPCM Electronic Arts");
  1729.  1729 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, sample_fmts_s16,  adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");
  1730.  1730 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1,       sample_fmts_s16p, adpcm_ea_r1,       "ADPCM Electronic Arts R1");
  1731.  1731 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2,       sample_fmts_s16p, adpcm_ea_r2,       "ADPCM Electronic Arts R2");
  1732.  1732 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3,       sample_fmts_s16p, adpcm_ea_r3,       "ADPCM Electronic Arts R3");
  1733.  1733 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS,      sample_fmts_s16p, adpcm_ea_xas,      "ADPCM Electronic Arts XAS");
  1734.  1734 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV,     sample_fmts_s16,  adpcm_ima_amv,     "ADPCM IMA AMV");
  1735.  1735 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC,     sample_fmts_s16,  adpcm_ima_apc,     "ADPCM IMA CRYO APC");
  1736.  1736 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DAT4,    sample_fmts_s16,  adpcm_ima_dat4,    "ADPCM IMA Eurocom DAT4");
  1737.  1737 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3,     sample_fmts_s16,  adpcm_ima_dk3,     "ADPCM IMA Duck DK3");
  1738.  1738 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4,     sample_fmts_s16,  adpcm_ima_dk4,     "ADPCM IMA Duck DK4");
  1739.  1739 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, sample_fmts_s16,  adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");
  1740.  1740 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, sample_fmts_s16,  adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");
  1741.  1741 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS,     sample_fmts_s16,  adpcm_ima_iss,     "ADPCM IMA Funcom ISS");
  1742.  1742 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI,     sample_fmts_s16,  adpcm_ima_oki,     "ADPCM IMA Dialogic OKI");
  1743.  1743 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT,      sample_fmts_s16p, adpcm_ima_qt,      "ADPCM IMA QuickTime");
  1744.  1744 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_RAD,     sample_fmts_s16,  adpcm_ima_rad,     "ADPCM IMA Radical");
  1745.  1745 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG,  sample_fmts_s16,  adpcm_ima_smjpeg,  "ADPCM IMA Loki SDL MJPEG");
  1746.  1746 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV,     sample_fmts_s16p, adpcm_ima_wav,     "ADPCM IMA WAV");
  1747.  1747 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS,      sample_fmts_both, adpcm_ima_ws,      "ADPCM IMA Westwood");
  1748.  1748 ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS,          sample_fmts_s16,  adpcm_ms,          "ADPCM Microsoft");
  1749.  1749 ADPCM_DECODER(AV_CODEC_ID_ADPCM_MTAF,        sample_fmts_s16p, adpcm_mtaf,        "ADPCM MTAF");
  1750.  1750 ADPCM_DECODER(AV_CODEC_ID_ADPCM_PSX,         sample_fmts_s16p, adpcm_psx,         "ADPCM Playstation");
  1751.  1751 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2,     sample_fmts_s16,  adpcm_sbpro_2,     "ADPCM Sound Blaster Pro 2-bit");
  1752.  1752 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3,     sample_fmts_s16,  adpcm_sbpro_3,     "ADPCM Sound Blaster Pro 2.6-bit");
  1753.  1753 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4,     sample_fmts_s16,  adpcm_sbpro_4,     "ADPCM Sound Blaster Pro 4-bit");
  1754.  1754 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF,         sample_fmts_s16,  adpcm_swf,         "ADPCM Shockwave Flash");
  1755.  1755 ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP_LE,      sample_fmts_s16p, adpcm_thp_le,      "ADPCM Nintendo THP (little-endian)");
  1756.  1756 ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP,         sample_fmts_s16p, adpcm_thp,         "ADPCM Nintendo THP");
  1757.  1757 ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA,          sample_fmts_s16p, adpcm_xa,          "ADPCM CDROM XA");
  1758.  1758 ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA,      sample_fmts_s16,  adpcm_yamaha,      "ADPCM Yamaha");


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