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FFmpeg/libavcodec/adpcm.c

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  1. /*

  2.  * Copyright (c) 2001-2003 The FFmpeg project

  3.  *

  4.  * first version by Francois Revol (revol@free.fr)

  5.  * fringe ADPCM codecs (e.g., DK3, DK4, Westwood)

  6.  *   by Mike Melanson (melanson@pcisys.net)

  7.  * CD-ROM XA ADPCM codec by BERO

  8.  * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)

  9.  * EA ADPCM R1/R2/R3 decoder by Peter Ross (pross@xvid.org)

  10.  * EA IMA EACS decoder by Peter Ross (pross@xvid.org)

  11.  * EA IMA SEAD decoder by Peter Ross (pross@xvid.org)

  12.  * EA ADPCM XAS decoder by Peter Ross (pross@xvid.org)

  13.  * MAXIS EA ADPCM decoder by Robert Marston (rmarston@gmail.com)

  14.  * THP ADPCM decoder by Marco Gerards (mgerards@xs4all.nl)

  15.  * Argonaut Games ADPCM decoder by Zane van Iperen (zane@zanevaniperen.com)

  16.  *

  17.  * This file is part of FFmpeg.

  18.  *

  19.  * FFmpeg is free software; you can redistribute it and/or

  20.  * modify it under the terms of the GNU Lesser General Public

  21.  * License as published by the Free Software Foundation; either

  22.  * version 2.1 of the License, or (at your option) any later version.

  23.  *

  24.  * FFmpeg is distributed in the hope that it will be useful,

  25.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  26.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  27.  * Lesser General Public License for more details.

  28.  *

  29.  * You should have received a copy of the GNU Lesser General Public

  30.  * License along with FFmpeg; if not, write to the Free Software

  31.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  32.  */

  33. #include "avcodec.h"

  34. #include "get_bits.h"

  35. #include "bytestream.h"

  36. #include "adpcm.h"

  37. #include "adpcm_data.h"

  38. #include "internal.h"

  39. 

  40. /**

  41.  * @file

  42.  * ADPCM decoders

  43.  * Features and limitations:

  44.  *

  45.  * Reference documents:

  46.  * http://wiki.multimedia.cx/index.php?title=Category:ADPCM_Audio_Codecs

  47.  * http://www.pcisys.net/~melanson/codecs/simpleaudio.html [dead]

  48.  * http://www.geocities.com/SiliconValley/8682/aud3.txt [dead]

  49.  * http://openquicktime.sourceforge.net/

  50.  * XAnim sources (xa_codec.c) http://xanim.polter.net/

  51.  * http://www.cs.ucla.edu/~leec/mediabench/applications.html [dead]

  52.  * SoX source code http://sox.sourceforge.net/

  53.  *

  54.  * CD-ROM XA:

  55.  * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html [dead]

  56.  * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html [dead]

  57.  * readstr http://www.geocities.co.jp/Playtown/2004/

  58.  */

  59. 

  60. /* These are for CD-ROM XA ADPCM */

  61. static const int8_t xa_adpcm_table[5][2] = {

  62.     {   0,   0 },

  63.     {  60,   0 },

  64.     { 115, -52 },

  65.     {  98, -55 },

  66.     { 122, -60 }

  67. };

  68. 

  69. static const int16_t ea_adpcm_table[] = {

  70.     0,  240,  460,  392,

  71.     0,    0, -208, -220,

  72.     0,    1,    3,    4,

  73.     7,    8,   10,   11,

  74.     0,   -1,   -3,   -4

  75. };

  76. 

  77. // padded to zero where table size is less then 16

  78. static const int8_t swf_index_tables[4][16] = {

  79.     /*2*/ { -1, 2 },

  80.     /*3*/ { -1, -1, 2, 4 },

  81.     /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },

  82.     /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }

  83. };

  84. 

  85. /* end of tables */

  86. 

  87. typedef struct ADPCMDecodeContext {

  88.     ADPCMChannelStatus status[14];

  89.     int vqa_version;                /**< VQA version. Used for ADPCM_IMA_WS */

  90.     int has_status;

  91. } ADPCMDecodeContext;

  92. 

  93. static av_cold int adpcm_decode_init(AVCodecContext * avctx)

  94. {

  95.     ADPCMDecodeContext *c = avctx->priv_data;

  96.     unsigned int min_channels = 1;

  97.     unsigned int max_channels = 2;

  98. 

  99.     switch(avctx->codec->id) {

  100.     case AV_CODEC_ID_ADPCM_DTK:

  101.     case AV_CODEC_ID_ADPCM_EA:

  102.         min_channels = 2;

  103.         break;

  104.     case AV_CODEC_ID_ADPCM_AFC:

  105.     case AV_CODEC_ID_ADPCM_EA_R1:

  106.     case AV_CODEC_ID_ADPCM_EA_R2:

  107.     case AV_CODEC_ID_ADPCM_EA_R3:

  108.     case AV_CODEC_ID_ADPCM_EA_XAS:

  109.     case AV_CODEC_ID_ADPCM_MS:

  110.         max_channels = 6;

  111.         break;

  112.     case AV_CODEC_ID_ADPCM_MTAF:

  113.         min_channels = 2;

  114.         max_channels = 8;

  115.         if (avctx->channels & 1) {

  116.             avpriv_request_sample(avctx, "channel count %d\n", avctx->channels);

  117.             return AVERROR_PATCHWELCOME;

  118.         }

  119.         break;

  120.     case AV_CODEC_ID_ADPCM_PSX:

  121.         max_channels = 8;

  122.         break;

  123.     case AV_CODEC_ID_ADPCM_IMA_DAT4:

  124.     case AV_CODEC_ID_ADPCM_THP:

  125.     case AV_CODEC_ID_ADPCM_THP_LE:

  126.         max_channels = 14;

  127.         break;

  128.     }

  129.     if (avctx->channels < min_channels || avctx->channels > max_channels) {

  130.         av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");

  131.         return AVERROR(EINVAL);

  132.     }

  133. 

  134.     switch(avctx->codec->id) {

  135.     case AV_CODEC_ID_ADPCM_CT:

  136.         c->status[0].step = c->status[1].step = 511;

  137.         break;

  138.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  139.         if (avctx->bits_per_coded_sample < 2 || avctx->bits_per_coded_sample > 5)

  140.             return AVERROR_INVALIDDATA;

  141.         break;

  142.     case AV_CODEC_ID_ADPCM_IMA_APC:

  143.         if (avctx->extradata && avctx->extradata_size >= 8) {

  144.             c->status[0].predictor = av_clip_intp2(AV_RL32(avctx->extradata    ), 18);

  145.             c->status[1].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 4), 18);

  146.         }

  147.         break;

  148.     case AV_CODEC_ID_ADPCM_IMA_WS:

  149.         if (avctx->extradata && avctx->extradata_size >= 2)

  150.             c->vqa_version = AV_RL16(avctx->extradata);

  151.         break;

  152.     case AV_CODEC_ID_ADPCM_ARGO:

  153.         if (avctx->bits_per_coded_sample != 4)

  154.             return AVERROR_INVALIDDATA;

  155.         break;

  156.     default:

  157.         break;

  158.     }

  159. 

  160.     switch(avctx->codec->id) {

  161.         case AV_CODEC_ID_ADPCM_AICA:

  162.         case AV_CODEC_ID_ADPCM_IMA_DAT4:

  163.         case AV_CODEC_ID_ADPCM_IMA_QT:

  164.         case AV_CODEC_ID_ADPCM_IMA_WAV:

  165.         case AV_CODEC_ID_ADPCM_4XM:

  166.         case AV_CODEC_ID_ADPCM_XA:

  167.         case AV_CODEC_ID_ADPCM_EA_R1:

  168.         case AV_CODEC_ID_ADPCM_EA_R2:

  169.         case AV_CODEC_ID_ADPCM_EA_R3:

  170.         case AV_CODEC_ID_ADPCM_EA_XAS:

  171.         case AV_CODEC_ID_ADPCM_THP:

  172.         case AV_CODEC_ID_ADPCM_THP_LE:

  173.         case AV_CODEC_ID_ADPCM_AFC:

  174.         case AV_CODEC_ID_ADPCM_DTK:

  175.         case AV_CODEC_ID_ADPCM_PSX:

  176.         case AV_CODEC_ID_ADPCM_MTAF:

  177.         case AV_CODEC_ID_ADPCM_ARGO:

  178.             avctx->sample_fmt = AV_SAMPLE_FMT_S16P;

  179.             break;

  180.         case AV_CODEC_ID_ADPCM_IMA_WS:

  181.             avctx->sample_fmt = c->vqa_version == 3 ? AV_SAMPLE_FMT_S16P :

  182.                                                       AV_SAMPLE_FMT_S16;

  183.             break;

  184.         case AV_CODEC_ID_ADPCM_MS:

  185.             avctx->sample_fmt = avctx->channels > 2 ? AV_SAMPLE_FMT_S16P :

  186.                                                       AV_SAMPLE_FMT_S16;

  187.             break;

  188.         default:

  189.             avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  190.     }

  191. 

  192.     return 0;

  193. }

  194. 

  195. static inline int16_t adpcm_agm_expand_nibble(ADPCMChannelStatus *c, int8_t nibble)

  196. {

  197.     int delta, pred, step, add;

  198. 

  199.     pred = c->predictor;

  200.     delta = nibble & 7;

  201.     step = c->step;

  202.     add = (delta * 2 + 1) * step;

  203.     if (add < 0)

  204.         add = add + 7;

  205. 

  206.     if ((nibble & 8) == 0)

  207.         pred = av_clip(pred + (add >> 3), -32767, 32767);

  208.     else

  209.         pred = av_clip(pred - (add >> 3), -32767, 32767);

  210. 

  211.     switch (delta) {

  212.     case 7:

  213.         step *= 0x99;

  214.         break;

  215.     case 6:

  216.         c->step = av_clip(c->step * 2, 127, 24576);

  217.         c->predictor = pred;

  218.         return pred;

  219.     case 5:

  220.         step *= 0x66;

  221.         break;

  222.     case 4:

  223.         step *= 0x4d;

  224.         break;

  225.     default:

  226.         step *= 0x39;

  227.         break;

  228.     }

  229. 

  230.     if (step < 0)

  231.         step += 0x3f;

  232. 

  233.     c->step = step >> 6;

  234.     c->step = av_clip(c->step, 127, 24576);

  235.     c->predictor = pred;

  236.     return pred;

  237. }

  238. 

  239. static inline int16_t adpcm_ima_expand_nibble(ADPCMChannelStatus *c, int8_t nibble, int shift)

  240. {

  241.     int step_index;

  242.     int predictor;

  243.     int sign, delta, diff, step;

  244. 

  245.     step = ff_adpcm_step_table[c->step_index];

  246.     step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];

  247.     step_index = av_clip(step_index, 0, 88);

  248. 

  249.     sign = nibble & 8;

  250.     delta = nibble & 7;

  251.     /* perform direct multiplication instead of series of jumps proposed by

  252.      * the reference ADPCM implementation since modern CPUs can do the mults

  253.      * quickly enough */

  254.     diff = ((2 * delta + 1) * step) >> shift;

  255.     predictor = c->predictor;

  256.     if (sign) predictor -= diff;

  257.     else predictor += diff;

  258. 

  259.     c->predictor = av_clip_int16(predictor);

  260.     c->step_index = step_index;

  261. 

  262.     return (int16_t)c->predictor;

  263. }

  264. 

  265. static inline int16_t adpcm_ima_wav_expand_nibble(ADPCMChannelStatus *c, GetBitContext *gb, int bps)

  266. {

  267.     int nibble, step_index, predictor, sign, delta, diff, step, shift;

  268. 

  269.     shift = bps - 1;

  270.     nibble = get_bits_le(gb, bps),

  271.     step = ff_adpcm_step_table[c->step_index];

  272.     step_index = c->step_index + ff_adpcm_index_tables[bps - 2][nibble];

  273.     step_index = av_clip(step_index, 0, 88);

  274. 

  275.     sign = nibble & (1 << shift);

  276.     delta = av_mod_uintp2(nibble, shift);

  277.     diff = ((2 * delta + 1) * step) >> shift;

  278.     predictor = c->predictor;

  279.     if (sign) predictor -= diff;

  280.     else predictor += diff;

  281. 

  282.     c->predictor = av_clip_int16(predictor);

  283.     c->step_index = step_index;

  284. 

  285.     return (int16_t)c->predictor;

  286. }

  287. 

  288. static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)

  289. {

  290.     int step_index;

  291.     int predictor;

  292.     int diff, step;

  293. 

  294.     step = ff_adpcm_step_table[c->step_index];

  295.     step_index = c->step_index + ff_adpcm_index_table[nibble];

  296.     step_index = av_clip(step_index, 0, 88);

  297. 

  298.     diff = step >> 3;

  299.     if (nibble & 4) diff += step;

  300.     if (nibble & 2) diff += step >> 1;

  301.     if (nibble & 1) diff += step >> 2;

  302. 

  303.     if (nibble & 8)

  304.         predictor = c->predictor - diff;

  305.     else

  306.         predictor = c->predictor + diff;

  307. 

  308.     c->predictor = av_clip_int16(predictor);

  309.     c->step_index = step_index;

  310. 

  311.     return c->predictor;

  312. }

  313. 

  314. static inline int16_t adpcm_ms_expand_nibble(ADPCMChannelStatus *c, int nibble)

  315. {

  316.     int predictor;

  317. 

  318.     predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;

  319.     predictor += ((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;

  320. 

  321.     c->sample2 = c->sample1;

  322.     c->sample1 = av_clip_int16(predictor);

  323.     c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;

  324.     if (c->idelta < 16) c->idelta = 16;

  325.     if (c->idelta > INT_MAX/768) {

  326.         av_log(NULL, AV_LOG_WARNING, "idelta overflow\n");

  327.         c->idelta = INT_MAX/768;

  328.     }

  329. 

  330.     return c->sample1;

  331. }

  332. 

  333. static inline int16_t adpcm_ima_oki_expand_nibble(ADPCMChannelStatus *c, int nibble)

  334. {

  335.     int step_index, predictor, sign, delta, diff, step;

  336. 

  337.     step = ff_adpcm_oki_step_table[c->step_index];

  338.     step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];

  339.     step_index = av_clip(step_index, 0, 48);

  340. 

  341.     sign = nibble & 8;

  342.     delta = nibble & 7;

  343.     diff = ((2 * delta + 1) * step) >> 3;

  344.     predictor = c->predictor;

  345.     if (sign) predictor -= diff;

  346.     else predictor += diff;

  347. 

  348.     c->predictor = av_clip_intp2(predictor, 11);

  349.     c->step_index = step_index;

  350. 

  351.     return c->predictor * 16;

  352. }

  353. 

  354. static inline int16_t adpcm_ct_expand_nibble(ADPCMChannelStatus *c, int8_t nibble)

  355. {

  356.     int sign, delta, diff;

  357.     int new_step;

  358. 

  359.     sign = nibble & 8;

  360.     delta = nibble & 7;

  361.     /* perform direct multiplication instead of series of jumps proposed by

  362.      * the reference ADPCM implementation since modern CPUs can do the mults

  363.      * quickly enough */

  364.     diff = ((2 * delta + 1) * c->step) >> 3;

  365.     /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */

  366.     c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);

  367.     c->predictor = av_clip_int16(c->predictor);

  368.     /* calculate new step and clamp it to range 511..32767 */

  369.     new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;

  370.     c->step = av_clip(new_step, 511, 32767);

  371. 

  372.     return (int16_t)c->predictor;

  373. }

  374. 

  375. static inline int16_t adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, int8_t nibble, int size, int shift)

  376. {

  377.     int sign, delta, diff;

  378. 

  379.     sign = nibble & (1<<(size-1));

  380.     delta = nibble & ((1<<(size-1))-1);

  381.     diff = delta << (7 + c->step + shift);

  382. 

  383.     /* clamp result */

  384.     c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);

  385. 

  386.     /* calculate new step */

  387.     if (delta >= (2*size - 3) && c->step < 3)

  388.         c->step++;

  389.     else if (delta == 0 && c->step > 0)

  390.         c->step--;

  391. 

  392.     return (int16_t) c->predictor;

  393. }

  394. 

  395. static inline int16_t adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, uint8_t nibble)

  396. {

  397.     if(!c->step) {

  398.         c->predictor = 0;

  399.         c->step = 127;

  400.     }

  401. 

  402.     c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;

  403.     c->predictor = av_clip_int16(c->predictor);

  404.     c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;

  405.     c->step = av_clip(c->step, 127, 24576);

  406.     return c->predictor;

  407. }

  408. 

  409. static inline int16_t adpcm_mtaf_expand_nibble(ADPCMChannelStatus *c, uint8_t nibble)

  410. {

  411.     c->predictor += ff_adpcm_mtaf_stepsize[c->step][nibble];

  412.     c->predictor = av_clip_int16(c->predictor);

  413.     c->step += ff_adpcm_index_table[nibble];

  414.     c->step = av_clip_uintp2(c->step, 5);

  415.     return c->predictor;

  416. }

  417. 

  418. static int xa_decode(AVCodecContext *avctx, int16_t *out0, int16_t *out1,

  419.                      const uint8_t *in, ADPCMChannelStatus *left,

  420.                      ADPCMChannelStatus *right, int channels, int sample_offset)

  421. {

  422.     int i, j;

  423.     int shift,filter,f0,f1;

  424.     int s_1,s_2;

  425.     int d,s,t;

  426. 

  427.     out0 += sample_offset;

  428.     if (channels == 1)

  429.         out1 = out0 + 28;

  430.     else

  431.         out1 += sample_offset;

  432. 

  433.     for(i=0;i<4;i++) {

  434.         shift  = 12 - (in[4+i*2] & 15);

  435.         filter = in[4+i*2] >> 4;

  436.         if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {

  437.             avpriv_request_sample(avctx, "unknown XA-ADPCM filter %d", filter);

  438.             filter=0;

  439.         }

  440.         f0 = xa_adpcm_table[filter][0];

  441.         f1 = xa_adpcm_table[filter][1];

  442. 

  443.         s_1 = left->sample1;

  444.         s_2 = left->sample2;

  445. 

  446.         for(j=0;j<28;j++) {

  447.             d = in[16+i+j*4];

  448. 

  449.             t = sign_extend(d, 4);

  450.             s = t*(1<<shift) + ((s_1*f0 + s_2*f1+32)>>6);

  451.             s_2 = s_1;

  452.             s_1 = av_clip_int16(s);

  453.             out0[j] = s_1;

  454.         }

  455. 

  456.         if (channels == 2) {

  457.             left->sample1 = s_1;

  458.             left->sample2 = s_2;

  459.             s_1 = right->sample1;

  460.             s_2 = right->sample2;

  461.         }

  462. 

  463.         shift  = 12 - (in[5+i*2] & 15);

  464.         filter = in[5+i*2] >> 4;

  465.         if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {

  466.             avpriv_request_sample(avctx, "unknown XA-ADPCM filter %d", filter);

  467.             filter=0;

  468.         }

  469. 

  470.         f0 = xa_adpcm_table[filter][0];

  471.         f1 = xa_adpcm_table[filter][1];

  472. 

  473.         for(j=0;j<28;j++) {

  474.             d = in[16+i+j*4];

  475. 

  476.             t = sign_extend(d >> 4, 4);

  477.             s = t*(1<<shift) + ((s_1*f0 + s_2*f1+32)>>6);

  478.             s_2 = s_1;

  479.             s_1 = av_clip_int16(s);

  480.             out1[j] = s_1;

  481.         }

  482. 

  483.         if (channels == 2) {

  484.             right->sample1 = s_1;

  485.             right->sample2 = s_2;

  486.         } else {

  487.             left->sample1 = s_1;

  488.             left->sample2 = s_2;

  489.         }

  490. 

  491.         out0 += 28 * (3 - channels);

  492.         out1 += 28 * (3 - channels);

  493.     }

  494. 

  495.     return 0;

  496. }

  497. 

  498. static void adpcm_swf_decode(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int16_t *samples)

  499. {

  500.     ADPCMDecodeContext *c = avctx->priv_data;

  501.     GetBitContext gb;

  502.     const int8_t *table;

  503.     int k0, signmask, nb_bits, count;

  504.     int size = buf_size*8;

  505.     int i;

  506. 

  507.     init_get_bits(&gb, buf, size);

  508. 

  509.     //read bits & initial values

  510.     nb_bits = get_bits(&gb, 2)+2;

  511.     table = swf_index_tables[nb_bits-2];

  512.     k0 = 1 << (nb_bits-2);

  513.     signmask = 1 << (nb_bits-1);

  514. 

  515.     while (get_bits_count(&gb) <= size - 22*avctx->channels) {

  516.         for (i = 0; i < avctx->channels; i++) {

  517.             *samples++ = c->status[i].predictor = get_sbits(&gb, 16);

  518.             c->status[i].step_index = get_bits(&gb, 6);

  519.         }

  520. 

  521.         for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {

  522.             int i;

  523. 

  524.             for (i = 0; i < avctx->channels; i++) {

  525.                 // similar to IMA adpcm

  526.                 int delta = get_bits(&gb, nb_bits);

  527.                 int step = ff_adpcm_step_table[c->status[i].step_index];

  528.                 int vpdiff = 0; // vpdiff = (delta+0.5)*step/4

  529.                 int k = k0;

  530. 

  531.                 do {

  532.                     if (delta & k)

  533.                         vpdiff += step;

  534.                     step >>= 1;

  535.                     k >>= 1;

  536.                 } while(k);

  537.                 vpdiff += step;

  538. 

  539.                 if (delta & signmask)

  540.                     c->status[i].predictor -= vpdiff;

  541.                 else

  542.                     c->status[i].predictor += vpdiff;

  543. 

  544.                 c->status[i].step_index += table[delta & (~signmask)];

  545. 

  546.                 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);

  547.                 c->status[i].predictor = av_clip_int16(c->status[i].predictor);

  548. 

  549.                 *samples++ = c->status[i].predictor;

  550.             }

  551.         }

  552.     }

  553. }

  554. 

  555. static inline int16_t adpcm_argo_expand_nibble(ADPCMChannelStatus *cs, int nibble, int control, int shift)

  556. {

  557.     int sample = nibble * (1 << shift);

  558. 

  559.     if (control & 0x04)

  560.         sample += (8 * cs->sample1) - (4 * cs->sample2);

  561.     else

  562.         sample += 4 * cs->sample1;

  563. 

  564.     sample = av_clip_int16(sample >> 2);

  565. 

  566.     cs->sample2 = cs->sample1;

  567.     cs->sample1 = sample;

  568. 

  569.     return sample;

  570. }

  571. 

  572. /**

  573.  * Get the number of samples that will be decoded from the packet.

  574.  * In one case, this is actually the maximum number of samples possible to

  575.  * decode with the given buf_size.

  576.  *

  577.  * @param[out] coded_samples set to the number of samples as coded in the

  578.  *                           packet, or 0 if the codec does not encode the

  579.  *                           number of samples in each frame.

  580.  * @param[out] approx_nb_samples set to non-zero if the number of samples

  581.  *                               returned is an approximation.

  582.  */

  583. static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,

  584.                           int buf_size, int *coded_samples, int *approx_nb_samples)

  585. {

  586.     ADPCMDecodeContext *s = avctx->priv_data;

  587.     int nb_samples        = 0;

  588.     int ch                = avctx->channels;

  589.     int has_coded_samples = 0;

  590.     int header_size;

  591. 

  592.     *coded_samples = 0;

  593.     *approx_nb_samples = 0;

  594. 

  595.     if(ch <= 0)

  596.         return 0;

  597. 

  598.     switch (avctx->codec->id) {

  599.     /* constant, only check buf_size */

  600.     case AV_CODEC_ID_ADPCM_EA_XAS:

  601.         if (buf_size < 76 * ch)

  602.             return 0;

  603.         nb_samples = 128;

  604.         break;

  605.     case AV_CODEC_ID_ADPCM_IMA_QT:

  606.         if (buf_size < 34 * ch)

  607.             return 0;

  608.         nb_samples = 64;

  609.         break;

  610.     case AV_CODEC_ID_ADPCM_ARGO:

  611.         if (buf_size < 17 * ch)

  612.             return 0;

  613.         nb_samples = 32;

  614.         break;

  615.     /* simple 4-bit adpcm */

  616.     case AV_CODEC_ID_ADPCM_CT:

  617.     case AV_CODEC_ID_ADPCM_IMA_APC:

  618.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  619.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  620.     case AV_CODEC_ID_ADPCM_IMA_WS:

  621.     case AV_CODEC_ID_ADPCM_YAMAHA:

  622.     case AV_CODEC_ID_ADPCM_AICA:

  623.         nb_samples = buf_size * 2 / ch;

  624.         break;

  625.     }

  626.     if (nb_samples)

  627.         return nb_samples;

  628. 

  629.     /* simple 4-bit adpcm, with header */

  630.     header_size = 0;

  631.     switch (avctx->codec->id) {

  632.         case AV_CODEC_ID_ADPCM_4XM:

  633.         case AV_CODEC_ID_ADPCM_AGM:

  634.         case AV_CODEC_ID_ADPCM_IMA_DAT4:

  635.         case AV_CODEC_ID_ADPCM_IMA_ISS:     header_size = 4 * ch;      break;

  636.         case AV_CODEC_ID_ADPCM_IMA_AMV:     header_size = 8;           break;

  637.         case AV_CODEC_ID_ADPCM_IMA_SMJPEG:  header_size = 4 * ch;      break;

  638.     }

  639.     if (header_size > 0)

  640.         return (buf_size - header_size) * 2 / ch;

  641. 

  642.     /* more complex formats */

  643.     switch (avctx->codec->id) {

  644.     case AV_CODEC_ID_ADPCM_EA:

  645.         has_coded_samples = 1;

  646.         *coded_samples  = bytestream2_get_le32(gb);

  647.         *coded_samples -= *coded_samples % 28;

  648.         nb_samples      = (buf_size - 12) / 30 * 28;

  649.         break;

  650.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  651.         has_coded_samples = 1;

  652.         *coded_samples = bytestream2_get_le32(gb);

  653.         nb_samples     = (buf_size - (4 + 8 * ch)) * 2 / ch;

  654.         break;

  655.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

  656.         nb_samples = (buf_size - ch) / ch * 2;

  657.         break;

  658.     case AV_CODEC_ID_ADPCM_EA_R1:

  659.     case AV_CODEC_ID_ADPCM_EA_R2:

  660.     case AV_CODEC_ID_ADPCM_EA_R3:

  661.         /* maximum number of samples */

  662.         /* has internal offsets and a per-frame switch to signal raw 16-bit */

  663.         has_coded_samples = 1;

  664.         switch (avctx->codec->id) {

  665.         case AV_CODEC_ID_ADPCM_EA_R1:

  666.             header_size    = 4 + 9 * ch;

  667.             *coded_samples = bytestream2_get_le32(gb);

  668.             break;

  669.         case AV_CODEC_ID_ADPCM_EA_R2:

  670.             header_size    = 4 + 5 * ch;

  671.             *coded_samples = bytestream2_get_le32(gb);

  672.             break;

  673.         case AV_CODEC_ID_ADPCM_EA_R3:

  674.             header_size    = 4 + 5 * ch;

  675.             *coded_samples = bytestream2_get_be32(gb);

  676.             break;

  677.         }

  678.         *coded_samples -= *coded_samples % 28;

  679.         nb_samples      = (buf_size - header_size) * 2 / ch;

  680.         nb_samples     -= nb_samples % 28;

  681.         *approx_nb_samples = 1;

  682.         break;

  683.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  684.         if (avctx->block_align > 0)

  685.             buf_size = FFMIN(buf_size, avctx->block_align);

  686.         nb_samples = ((buf_size - 16) * 2 / 3 * 4) / ch;

  687.         break;

  688.     case AV_CODEC_ID_ADPCM_IMA_DK4:

  689.         if (avctx->block_align > 0)

  690.             buf_size = FFMIN(buf_size, avctx->block_align);

  691.         if (buf_size < 4 * ch)

  692.             return AVERROR_INVALIDDATA;

  693.         nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;

  694.         break;

  695.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  696.         if (avctx->block_align > 0)

  697.             buf_size = FFMIN(buf_size, avctx->block_align);

  698.         nb_samples = (buf_size - 4 * ch) * 2 / ch;

  699.         break;

  700.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  701.     {

  702.         int bsize = ff_adpcm_ima_block_sizes[avctx->bits_per_coded_sample - 2];

  703.         int bsamples = ff_adpcm_ima_block_samples[avctx->bits_per_coded_sample - 2];

  704.         if (avctx->block_align > 0)

  705.             buf_size = FFMIN(buf_size, avctx->block_align);

  706.         if (buf_size < 4 * ch)

  707.             return AVERROR_INVALIDDATA;

  708.         nb_samples = 1 + (buf_size - 4 * ch) / (bsize * ch) * bsamples;

  709.         break;

  710.     }

  711.     case AV_CODEC_ID_ADPCM_MS:

  712.         if (avctx->block_align > 0)

  713.             buf_size = FFMIN(buf_size, avctx->block_align);

  714.         nb_samples = (buf_size - 6 * ch) * 2 / ch;

  715.         break;

  716.     case AV_CODEC_ID_ADPCM_MTAF:

  717.         if (avctx->block_align > 0)

  718.             buf_size = FFMIN(buf_size, avctx->block_align);

  719.         nb_samples = (buf_size - 16 * (ch / 2)) * 2 / ch;

  720.         break;

  721.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  722.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  723.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  724.     {

  725.         int samples_per_byte;

  726.         switch (avctx->codec->id) {

  727.         case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;

  728.         case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;

  729.         case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;

  730.         }

  731.         if (!s->status[0].step_index) {

  732.             if (buf_size < ch)

  733.                 return AVERROR_INVALIDDATA;

  734.             nb_samples++;

  735.             buf_size -= ch;

  736.         }

  737.         nb_samples += buf_size * samples_per_byte / ch;

  738.         break;

  739.     }

  740.     case AV_CODEC_ID_ADPCM_SWF:

  741.     {

  742.         int buf_bits       = buf_size * 8 - 2;

  743.         int nbits          = (bytestream2_get_byte(gb) >> 6) + 2;

  744.         int block_hdr_size = 22 * ch;

  745.         int block_size     = block_hdr_size + nbits * ch * 4095;

  746.         int nblocks        = buf_bits / block_size;

  747.         int bits_left      = buf_bits - nblocks * block_size;

  748.         nb_samples         = nblocks * 4096;

  749.         if (bits_left >= block_hdr_size)

  750.             nb_samples += 1 + (bits_left - block_hdr_size) / (nbits * ch);

  751.         break;

  752.     }

  753.     case AV_CODEC_ID_ADPCM_THP:

  754.     case AV_CODEC_ID_ADPCM_THP_LE:

  755.         if (avctx->extradata) {

  756.             nb_samples = buf_size * 14 / (8 * ch);

  757.             break;

  758.         }

  759.         has_coded_samples = 1;

  760.         bytestream2_skip(gb, 4); // channel size

  761.         *coded_samples  = (avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE) ?

  762.                           bytestream2_get_le32(gb) :

  763.                           bytestream2_get_be32(gb);

  764.         buf_size       -= 8 + 36 * ch;

  765.         buf_size       /= ch;

  766.         nb_samples      = buf_size / 8 * 14;

  767.         if (buf_size % 8 > 1)

  768.             nb_samples     += (buf_size % 8 - 1) * 2;

  769.         *approx_nb_samples = 1;

  770.         break;

  771.     case AV_CODEC_ID_ADPCM_AFC:

  772.         nb_samples = buf_size / (9 * ch) * 16;

  773.         break;

  774.     case AV_CODEC_ID_ADPCM_XA:

  775.         nb_samples = (buf_size / 128) * 224 / ch;

  776.         break;

  777.     case AV_CODEC_ID_ADPCM_DTK:

  778.     case AV_CODEC_ID_ADPCM_PSX:

  779.         nb_samples = buf_size / (16 * ch) * 28;

  780.         break;

  781.     }

  782. 

  783.     /* validate coded sample count */

  784.     if (has_coded_samples && (*coded_samples <= 0 || *coded_samples > nb_samples))

  785.         return AVERROR_INVALIDDATA;

  786. 

  787.     return nb_samples;

  788. }

  789. 

  790. static int adpcm_decode_frame(AVCodecContext *avctx, void *data,

  791.                               int *got_frame_ptr, AVPacket *avpkt)

  792. {

  793.     AVFrame *frame     = data;

  794.     const uint8_t *buf = avpkt->data;

  795.     int buf_size = avpkt->size;

  796.     ADPCMDecodeContext *c = avctx->priv_data;

  797.     ADPCMChannelStatus *cs;

  798.     int n, m, channel, i;

  799.     int16_t *samples;

  800.     int16_t **samples_p;

  801.     int st; /* stereo */

  802.     int count1, count2;

  803.     int nb_samples, coded_samples, approx_nb_samples, ret;

  804.     GetByteContext gb;

  805. 

  806.     bytestream2_init(&gb, buf, buf_size);

  807.     nb_samples = get_nb_samples(avctx, &gb, buf_size, &coded_samples, &approx_nb_samples);

  808.     if (nb_samples <= 0) {

  809.         av_log(avctx, AV_LOG_ERROR, "invalid number of samples in packet\n");

  810.         return AVERROR_INVALIDDATA;

  811.     }

  812. 

  813.     /* get output buffer */

  814.     frame->nb_samples = nb_samples;

  815.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

  816.         return ret;

  817.     samples = (int16_t *)frame->data[0];

  818.     samples_p = (int16_t **)frame->extended_data;

  819. 

  820.     /* use coded_samples when applicable */

  821.     /* it is always <= nb_samples, so the output buffer will be large enough */

  822.     if (coded_samples) {

  823.         if (!approx_nb_samples && coded_samples != nb_samples)

  824.             av_log(avctx, AV_LOG_WARNING, "mismatch in coded sample count\n");

  825.         frame->nb_samples = nb_samples = coded_samples;

  826.     }

  827. 

  828.     st = avctx->channels == 2 ? 1 : 0;

  829. 

  830.     switch(avctx->codec->id) {

  831.     case AV_CODEC_ID_ADPCM_IMA_QT:

  832.         /* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).

  833.            Channel data is interleaved per-chunk. */

  834.         for (channel = 0; channel < avctx->channels; channel++) {

  835.             int predictor;

  836.             int step_index;

  837.             cs = &(c->status[channel]);

  838.             /* (pppppp) (piiiiiii) */

  839. 

  840.             /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */

  841.             predictor = sign_extend(bytestream2_get_be16u(&gb), 16);

  842.             step_index = predictor & 0x7F;

  843.             predictor &= ~0x7F;

  844. 

  845.             if (cs->step_index == step_index) {

  846.                 int diff = predictor - cs->predictor;

  847.                 if (diff < 0)

  848.                     diff = - diff;

  849.                 if (diff > 0x7f)

  850.                     goto update;

  851.             } else {

  852.             update:

  853.                 cs->step_index = step_index;

  854.                 cs->predictor = predictor;

  855.             }

  856. 

  857.             if (cs->step_index > 88u){

  858.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  859.                        channel, cs->step_index);

  860.                 return AVERROR_INVALIDDATA;

  861.             }

  862. 

  863.             samples = samples_p[channel];

  864. 

  865.             for (m = 0; m < 64; m += 2) {

  866.                 int byte = bytestream2_get_byteu(&gb);

  867.                 samples[m    ] = adpcm_ima_qt_expand_nibble(cs, byte & 0x0F, 3);

  868.                 samples[m + 1] = adpcm_ima_qt_expand_nibble(cs, byte >> 4  , 3);

  869.             }

  870.         }

  871.         break;

  872.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  873.         for(i=0; i<avctx->channels; i++){

  874.             cs = &(c->status[i]);

  875.             cs->predictor = samples_p[i][0] = sign_extend(bytestream2_get_le16u(&gb), 16);

  876. 

  877.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  878.             if (cs->step_index > 88u){

  879.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  880.                        i, cs->step_index);

  881.                 return AVERROR_INVALIDDATA;

  882.             }

  883.         }

  884. 

  885.         if (avctx->bits_per_coded_sample != 4) {

  886.             int samples_per_block = ff_adpcm_ima_block_samples[avctx->bits_per_coded_sample - 2];

  887.             int block_size = ff_adpcm_ima_block_sizes[avctx->bits_per_coded_sample - 2];

  888.             uint8_t temp[20 + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 };

  889.             GetBitContext g;

  890. 

  891.             for (n = 0; n < (nb_samples - 1) / samples_per_block; n++) {

  892.                 for (i = 0; i < avctx->channels; i++) {

  893.                     int j;

  894. 

  895.                     cs = &c->status[i];

  896.                     samples = &samples_p[i][1 + n * samples_per_block];

  897.                     for (j = 0; j < block_size; j++) {

  898.                         temp[j] = buf[4 * avctx->channels + block_size * n * avctx->channels +

  899.                                         (j % 4) + (j / 4) * (avctx->channels * 4) + i * 4];

  900.                     }

  901.                     ret = init_get_bits8(&g, (const uint8_t *)&temp, block_size);

  902.                     if (ret < 0)

  903.                         return ret;

  904.                     for (m = 0; m < samples_per_block; m++) {

  905.                         samples[m] = adpcm_ima_wav_expand_nibble(cs, &g,

  906.                                           avctx->bits_per_coded_sample);

  907.                     }

  908.                 }

  909.             }

  910.             bytestream2_skip(&gb, avctx->block_align - avctx->channels * 4);

  911.         } else {

  912.         for (n = 0; n < (nb_samples - 1) / 8; n++) {

  913.             for (i = 0; i < avctx->channels; i++) {

  914.                 cs = &c->status[i];

  915.                 samples = &samples_p[i][1 + n * 8];

  916.                 for (m = 0; m < 8; m += 2) {

  917.                     int v = bytestream2_get_byteu(&gb);

  918.                     samples[m    ] = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);

  919.                     samples[m + 1] = adpcm_ima_expand_nibble(cs, v >> 4  , 3);

  920.                 }

  921.             }

  922.         }

  923.         }

  924.         break;

  925.     case AV_CODEC_ID_ADPCM_4XM:

  926.         for (i = 0; i < avctx->channels; i++)

  927.             c->status[i].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  928. 

  929.         for (i = 0; i < avctx->channels; i++) {

  930.             c->status[i].step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  931.             if (c->status[i].step_index > 88u) {

  932.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  933.                        i, c->status[i].step_index);

  934.                 return AVERROR_INVALIDDATA;

  935.             }

  936.         }

  937. 

  938.         for (i = 0; i < avctx->channels; i++) {

  939.             samples = (int16_t *)frame->data[i];

  940.             cs = &c->status[i];

  941.             for (n = nb_samples >> 1; n > 0; n--) {

  942.                 int v = bytestream2_get_byteu(&gb);

  943.                 *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);

  944.                 *samples++ = adpcm_ima_expand_nibble(cs, v >> 4  , 4);

  945.             }

  946.         }

  947.         break;

  948.     case AV_CODEC_ID_ADPCM_AGM:

  949.         for (i = 0; i < avctx->channels; i++)

  950.             c->status[i].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  951.         for (i = 0; i < avctx->channels; i++)

  952.             c->status[i].step = sign_extend(bytestream2_get_le16u(&gb), 16);

  953. 

  954.         for (n = 0; n < nb_samples >> (1 - st); n++) {

  955.             int v = bytestream2_get_byteu(&gb);

  956.             *samples++ = adpcm_agm_expand_nibble(&c->status[0], v & 0xF);

  957.             *samples++ = adpcm_agm_expand_nibble(&c->status[st], v >> 4 );

  958.         }

  959.         break;

  960.     case AV_CODEC_ID_ADPCM_MS:

  961.     {

  962.         int block_predictor;

  963. 

  964.         if (avctx->channels > 2) {

  965.             for (channel = 0; channel < avctx->channels; channel++) {

  966.                 samples = samples_p[channel];

  967.                 block_predictor = bytestream2_get_byteu(&gb);

  968.                 if (block_predictor > 6) {

  969.                     av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[%d] = %d\n",

  970.                            channel, block_predictor);

  971.                     return AVERROR_INVALIDDATA;

  972.                 }

  973.                 c->status[channel].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];

  974.                 c->status[channel].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];

  975.                 c->status[channel].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);

  976.                 c->status[channel].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);

  977.                 c->status[channel].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);

  978.                 *samples++ = c->status[channel].sample2;

  979.                 *samples++ = c->status[channel].sample1;

  980.                 for(n = (nb_samples - 2) >> 1; n > 0; n--) {

  981.                     int byte = bytestream2_get_byteu(&gb);

  982.                     *samples++ = adpcm_ms_expand_nibble(&c->status[channel], byte >> 4  );

  983.                     *samples++ = adpcm_ms_expand_nibble(&c->status[channel], byte & 0x0F);

  984.                 }

  985.             }

  986.         } else {

  987.             block_predictor = bytestream2_get_byteu(&gb);

  988.             if (block_predictor > 6) {

  989.                 av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[0] = %d\n",

  990.                        block_predictor);

  991.                 return AVERROR_INVALIDDATA;

  992.             }

  993.             c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];

  994.             c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];

  995.             if (st) {

  996.                 block_predictor = bytestream2_get_byteu(&gb);

  997.                 if (block_predictor > 6) {

  998.                     av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[1] = %d\n",

  999.                            block_predictor);

  1000.                     return AVERROR_INVALIDDATA;

  1001.                 }

  1002.                 c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];

  1003.                 c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];

  1004.             }

  1005.             c->status[0].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);

  1006.             if (st){

  1007.                 c->status[1].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);

  1008.             }

  1009. 

  1010.             c->status[0].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);

  1011.             if (st) c->status[1].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);

  1012.             c->status[0].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);

  1013.             if (st) c->status[1].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);

  1014. 

  1015.             *samples++ = c->status[0].sample2;

  1016.             if (st) *samples++ = c->status[1].sample2;

  1017.             *samples++ = c->status[0].sample1;

  1018.             if (st) *samples++ = c->status[1].sample1;

  1019.             for(n = (nb_samples - 2) >> (1 - st); n > 0; n--) {

  1020.                 int byte = bytestream2_get_byteu(&gb);

  1021.                 *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], byte >> 4  );

  1022.                 *samples++ = adpcm_ms_expand_nibble(&c->status[st], byte & 0x0F);

  1023.             }

  1024.         }

  1025.         break;

  1026.     }

  1027.     case AV_CODEC_ID_ADPCM_MTAF:

  1028.         for (channel = 0; channel < avctx->channels; channel+=2) {

  1029.             bytestream2_skipu(&gb, 4);

  1030.             c->status[channel    ].step      = bytestream2_get_le16u(&gb) & 0x1f;

  1031.             c->status[channel + 1].step      = bytestream2_get_le16u(&gb) & 0x1f;

  1032.             c->status[channel    ].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  1033.             bytestream2_skipu(&gb, 2);

  1034.             c->status[channel + 1].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  1035.             bytestream2_skipu(&gb, 2);

  1036.             for (n = 0; n < nb_samples; n+=2) {

  1037.                 int v = bytestream2_get_byteu(&gb);

  1038.                 samples_p[channel][n    ] = adpcm_mtaf_expand_nibble(&c->status[channel], v & 0x0F);

  1039.                 samples_p[channel][n + 1] = adpcm_mtaf_expand_nibble(&c->status[channel], v >> 4  );

  1040.             }

  1041.             for (n = 0; n < nb_samples; n+=2) {

  1042.                 int v = bytestream2_get_byteu(&gb);

  1043.                 samples_p[channel + 1][n    ] = adpcm_mtaf_expand_nibble(&c->status[channel + 1], v & 0x0F);

  1044.                 samples_p[channel + 1][n + 1] = adpcm_mtaf_expand_nibble(&c->status[channel + 1], v >> 4  );

  1045.             }

  1046.         }

  1047.         break;

  1048.     case AV_CODEC_ID_ADPCM_IMA_DK4:

  1049.         for (channel = 0; channel < avctx->channels; channel++) {

  1050.             cs = &c->status[channel];

  1051.             cs->predictor  = *samples++ = sign_extend(bytestream2_get_le16u(&gb), 16);

  1052.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1053.             if (cs->step_index > 88u){

  1054.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1055.                        channel, cs->step_index);

  1056.                 return AVERROR_INVALIDDATA;

  1057.             }

  1058.         }

  1059.         for (n = (nb_samples - 1) >> (1 - st); n > 0; n--) {

  1060.             int v = bytestream2_get_byteu(&gb);

  1061.             *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4  , 3);

  1062.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

  1063.         }

  1064.         break;

  1065.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  1066.     {

  1067.         int last_byte = 0;

  1068.         int nibble;

  1069.         int decode_top_nibble_next = 0;

  1070.         int diff_channel;

  1071.         const int16_t *samples_end = samples + avctx->channels * nb_samples;

  1072. 

  1073.         bytestream2_skipu(&gb, 10);

  1074.         c->status[0].predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1075.         c->status[1].predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1076.         c->status[0].step_index = bytestream2_get_byteu(&gb);

  1077.         c->status[1].step_index = bytestream2_get_byteu(&gb);

  1078.         if (c->status[0].step_index > 88u || c->status[1].step_index > 88u){

  1079.             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i/%i\n",

  1080.                    c->status[0].step_index, c->status[1].step_index);

  1081.             return AVERROR_INVALIDDATA;

  1082.         }

  1083.         /* sign extend the predictors */

  1084.         diff_channel = c->status[1].predictor;

  1085. 

  1086.         /* DK3 ADPCM support macro */

  1087. #define DK3_GET_NEXT_NIBBLE() \

  1088.     if (decode_top_nibble_next) { \

  1089.         nibble = last_byte >> 4; \

  1090.         decode_top_nibble_next = 0; \

  1091.     } else { \

  1092.         last_byte = bytestream2_get_byteu(&gb); \

  1093.         nibble = last_byte & 0x0F; \

  1094.         decode_top_nibble_next = 1; \

  1095.     }

  1096. 

  1097.         while (samples < samples_end) {

  1098. 

  1099.             /* for this algorithm, c->status[0] is the sum channel and

  1100.              * c->status[1] is the diff channel */

  1101. 

  1102.             /* process the first predictor of the sum channel */

  1103.             DK3_GET_NEXT_NIBBLE();

  1104.             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

  1105. 

  1106.             /* process the diff channel predictor */

  1107.             DK3_GET_NEXT_NIBBLE();

  1108.             adpcm_ima_expand_nibble(&c->status[1], nibble, 3);

  1109. 

  1110.             /* process the first pair of stereo PCM samples */

  1111.             diff_channel = (diff_channel + c->status[1].predictor) / 2;

  1112.             *samples++ = c->status[0].predictor + c->status[1].predictor;

  1113.             *samples++ = c->status[0].predictor - c->status[1].predictor;

  1114. 

  1115.             /* process the second predictor of the sum channel */

  1116.             DK3_GET_NEXT_NIBBLE();

  1117.             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

  1118. 

  1119.             /* process the second pair of stereo PCM samples */

  1120.             diff_channel = (diff_channel + c->status[1].predictor) / 2;

  1121.             *samples++ = c->status[0].predictor + c->status[1].predictor;

  1122.             *samples++ = c->status[0].predictor - c->status[1].predictor;

  1123.         }

  1124. 

  1125.         if ((bytestream2_tell(&gb) & 1))

  1126.             bytestream2_skip(&gb, 1);

  1127.         break;

  1128.     }

  1129.     case AV_CODEC_ID_ADPCM_IMA_ISS:

  1130.         for (channel = 0; channel < avctx->channels; channel++) {

  1131.             cs = &c->status[channel];

  1132.             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1133.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1134.             if (cs->step_index > 88u){

  1135.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1136.                        channel, cs->step_index);

  1137.                 return AVERROR_INVALIDDATA;

  1138.             }

  1139.         }

  1140. 

  1141.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1142.             int v1, v2;

  1143.             int v = bytestream2_get_byteu(&gb);

  1144.             /* nibbles are swapped for mono */

  1145.             if (st) {

  1146.                 v1 = v >> 4;

  1147.                 v2 = v & 0x0F;

  1148.             } else {

  1149.                 v2 = v >> 4;

  1150.                 v1 = v & 0x0F;

  1151.             }

  1152.             *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);

  1153.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);

  1154.         }

  1155.         break;

  1156.     case AV_CODEC_ID_ADPCM_IMA_DAT4:

  1157.         for (channel = 0; channel < avctx->channels; channel++) {

  1158.             cs = &c->status[channel];

  1159.             samples = samples_p[channel];

  1160.             bytestream2_skip(&gb, 4);

  1161.             for (n = 0; n < nb_samples; n += 2) {

  1162.                 int v = bytestream2_get_byteu(&gb);

  1163.                 *samples++ = adpcm_ima_expand_nibble(cs, v >> 4  , 3);

  1164.                 *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);

  1165.             }

  1166.         }

  1167.         break;

  1168.     case AV_CODEC_ID_ADPCM_IMA_APC:

  1169.         while (bytestream2_get_bytes_left(&gb) > 0) {

  1170.             int v = bytestream2_get_byteu(&gb);

  1171.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  v >> 4  , 3);

  1172.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

  1173.         }

  1174.         break;

  1175.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  1176.         while (bytestream2_get_bytes_left(&gb) > 0) {

  1177.             int v = bytestream2_get_byteu(&gb);

  1178.             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[0],  v >> 4  );

  1179.             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[st], v & 0x0F);

  1180.         }

  1181.         break;

  1182.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  1183.         for (channel = 0; channel < avctx->channels; channel++) {

  1184.             cs = &c->status[channel];

  1185.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1186.             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1187.             if (cs->step_index > 88u){

  1188.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1189.                        channel, cs->step_index);

  1190.                 return AVERROR_INVALIDDATA;

  1191.             }

  1192.         }

  1193.         for (n = 0; n < nb_samples / 2; n++) {

  1194.             int byte[2];

  1195. 

  1196.             byte[0] = bytestream2_get_byteu(&gb);

  1197.             if (st)

  1198.                 byte[1] = bytestream2_get_byteu(&gb);

  1199.             for(channel = 0; channel < avctx->channels; channel++) {

  1200.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] & 0x0F, 3);

  1201.             }

  1202.             for(channel = 0; channel < avctx->channels; channel++) {

  1203.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] >> 4  , 3);

  1204.             }

  1205.         }

  1206.         break;

  1207.     case AV_CODEC_ID_ADPCM_IMA_WS:

  1208.         if (c->vqa_version == 3) {

  1209.             for (channel = 0; channel < avctx->channels; channel++) {

  1210.                 int16_t *smp = samples_p[channel];

  1211. 

  1212.                 for (n = nb_samples / 2; n > 0; n--) {

  1213.                     int v = bytestream2_get_byteu(&gb);

  1214.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1215.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1216.                 }

  1217.             }

  1218.         } else {

  1219.             for (n = nb_samples / 2; n > 0; n--) {

  1220.                 for (channel = 0; channel < avctx->channels; channel++) {

  1221.                     int v = bytestream2_get_byteu(&gb);

  1222.                     *samples++  = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1223.                     samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1224.                 }

  1225.                 samples += avctx->channels;

  1226.             }

  1227.         }

  1228.         bytestream2_seek(&gb, 0, SEEK_END);

  1229.         break;

  1230.     case AV_CODEC_ID_ADPCM_XA:

  1231.     {

  1232.         int16_t *out0 = samples_p[0];

  1233.         int16_t *out1 = samples_p[1];

  1234.         int samples_per_block = 28 * (3 - avctx->channels) * 4;

  1235.         int sample_offset = 0;

  1236.         int bytes_remaining;

  1237.         while (bytestream2_get_bytes_left(&gb) >= 128) {

  1238.             if ((ret = xa_decode(avctx, out0, out1, buf + bytestream2_tell(&gb),

  1239.                                  &c->status[0], &c->status[1],

  1240.                                  avctx->channels, sample_offset)) < 0)

  1241.                 return ret;

  1242.             bytestream2_skipu(&gb, 128);

  1243.             sample_offset += samples_per_block;

  1244.         }

  1245.         /* Less than a full block of data left, e.g. when reading from

  1246.          * 2324 byte per sector XA; the remainder is padding */

  1247.         bytes_remaining = bytestream2_get_bytes_left(&gb);

  1248.         if (bytes_remaining > 0) {

  1249.             bytestream2_skip(&gb, bytes_remaining);

  1250.         }

  1251.         break;

  1252.     }

  1253.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  1254.         for (i=0; i<=st; i++) {

  1255.             c->status[i].step_index = bytestream2_get_le32u(&gb);

  1256.             if (c->status[i].step_index > 88u) {

  1257.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1258.                        i, c->status[i].step_index);

  1259.                 return AVERROR_INVALIDDATA;

  1260.             }

  1261.         }

  1262.         for (i=0; i<=st; i++) {

  1263.             c->status[i].predictor  = bytestream2_get_le32u(&gb);

  1264.             if (FFABS((int64_t)c->status[i].predictor) > (1<<16))

  1265.                 return AVERROR_INVALIDDATA;

  1266.         }

  1267. 

  1268.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1269.             int byte   = bytestream2_get_byteu(&gb);

  1270.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   3);

  1271.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);

  1272.         }

  1273.         break;

  1274.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  1275.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1276.             int byte = bytestream2_get_byteu(&gb);

  1277.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   6);

  1278.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);

  1279.         }

  1280.         break;

  1281.     case AV_CODEC_ID_ADPCM_EA:

  1282.     {

  1283.         int previous_left_sample, previous_right_sample;

  1284.         int current_left_sample, current_right_sample;

  1285.         int next_left_sample, next_right_sample;

  1286.         int coeff1l, coeff2l, coeff1r, coeff2r;

  1287.         int shift_left, shift_right;

  1288. 

  1289.         /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,

  1290.            each coding 28 stereo samples. */

  1291. 

  1292.         if(avctx->channels != 2)

  1293.             return AVERROR_INVALIDDATA;

  1294. 

  1295.         current_left_sample   = sign_extend(bytestream2_get_le16u(&gb), 16);

  1296.         previous_left_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1297.         current_right_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1298.         previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

  1299. 

  1300.         for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1301.             int byte = bytestream2_get_byteu(&gb);

  1302.             coeff1l = ea_adpcm_table[ byte >> 4       ];

  1303.             coeff2l = ea_adpcm_table[(byte >> 4  ) + 4];

  1304.             coeff1r = ea_adpcm_table[ byte & 0x0F];

  1305.             coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];

  1306. 

  1307.             byte = bytestream2_get_byteu(&gb);

  1308.             shift_left  = 20 - (byte >> 4);

  1309.             shift_right = 20 - (byte & 0x0F);

  1310. 

  1311.             for (count2 = 0; count2 < 28; count2++) {

  1312.                 byte = bytestream2_get_byteu(&gb);

  1313.                 next_left_sample  = sign_extend(byte >> 4, 4) * (1 << shift_left);

  1314.                 next_right_sample = sign_extend(byte,      4) * (1 << shift_right);

  1315. 

  1316.                 next_left_sample = (next_left_sample +

  1317.                     (current_left_sample * coeff1l) +

  1318.                     (previous_left_sample * coeff2l) + 0x80) >> 8;

  1319.                 next_right_sample = (next_right_sample +

  1320.                     (current_right_sample * coeff1r) +

  1321.                     (previous_right_sample * coeff2r) + 0x80) >> 8;

  1322. 

  1323.                 previous_left_sample = current_left_sample;

  1324.                 current_left_sample = av_clip_int16(next_left_sample);

  1325.                 previous_right_sample = current_right_sample;

  1326.                 current_right_sample = av_clip_int16(next_right_sample);

  1327.                 *samples++ = current_left_sample;

  1328.                 *samples++ = current_right_sample;

  1329.             }

  1330.         }

  1331. 

  1332.         bytestream2_skip(&gb, 2); // Skip terminating 0x0000

  1333. 

  1334.         break;

  1335.     }

  1336.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

  1337.     {

  1338.         int coeff[2][2], shift[2];

  1339. 

  1340.         for(channel = 0; channel < avctx->channels; channel++) {

  1341.             int byte = bytestream2_get_byteu(&gb);

  1342.             for (i=0; i<2; i++)

  1343.                 coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];

  1344.             shift[channel] = 20 - (byte & 0x0F);

  1345.         }

  1346.         for (count1 = 0; count1 < nb_samples / 2; count1++) {

  1347.             int byte[2];

  1348. 

  1349.             byte[0] = bytestream2_get_byteu(&gb);

  1350.             if (st) byte[1] = bytestream2_get_byteu(&gb);

  1351.             for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */

  1352.                 for(channel = 0; channel < avctx->channels; channel++) {

  1353.                     int sample = sign_extend(byte[channel] >> i, 4) * (1 << shift[channel]);

  1354.                     sample = (sample +

  1355.                              c->status[channel].sample1 * coeff[channel][0] +

  1356.                              c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;

  1357.                     c->status[channel].sample2 = c->status[channel].sample1;

  1358.                     c->status[channel].sample1 = av_clip_int16(sample);

  1359.                     *samples++ = c->status[channel].sample1;

  1360.                 }

  1361.             }

  1362.         }

  1363.         bytestream2_seek(&gb, 0, SEEK_END);

  1364.         break;

  1365.     }

  1366.     case AV_CODEC_ID_ADPCM_EA_R1:

  1367.     case AV_CODEC_ID_ADPCM_EA_R2:

  1368.     case AV_CODEC_ID_ADPCM_EA_R3: {

  1369.         /* channel numbering

  1370.            2chan: 0=fl, 1=fr

  1371.            4chan: 0=fl, 1=rl, 2=fr, 3=rr

  1372.            6chan: 0=fl, 1=c,  2=fr, 3=rl,  4=rr, 5=sub */

  1373.         const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;

  1374.         int previous_sample, current_sample, next_sample;

  1375.         int coeff1, coeff2;

  1376.         int shift;

  1377.         unsigned int channel;

  1378.         uint16_t *samplesC;

  1379.         int count = 0;

  1380.         int offsets[6];

  1381. 

  1382.         for (channel=0; channel<avctx->channels; channel++)

  1383.             offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :

  1384.                                              bytestream2_get_le32(&gb)) +

  1385.                                (avctx->channels + 1) * 4;

  1386. 

  1387.         for (channel=0; channel<avctx->channels; channel++) {

  1388.             bytestream2_seek(&gb, offsets[channel], SEEK_SET);

  1389.             samplesC = samples_p[channel];

  1390. 

  1391.             if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {

  1392.                 current_sample  = sign_extend(bytestream2_get_le16(&gb), 16);

  1393.                 previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);

  1394.             } else {

  1395.                 current_sample  = c->status[channel].predictor;

  1396.                 previous_sample = c->status[channel].prev_sample;

  1397.             }

  1398. 

  1399.             for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1400.                 int byte = bytestream2_get_byte(&gb);

  1401.                 if (byte == 0xEE) {  /* only seen in R2 and R3 */

  1402.                     current_sample  = sign_extend(bytestream2_get_be16(&gb), 16);

  1403.                     previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);

  1404. 

  1405.                     for (count2=0; count2<28; count2++)

  1406.                         *samplesC++ = sign_extend(bytestream2_get_be16(&gb), 16);

  1407.                 } else {

  1408.                     coeff1 = ea_adpcm_table[ byte >> 4     ];

  1409.                     coeff2 = ea_adpcm_table[(byte >> 4) + 4];

  1410.                     shift = 20 - (byte & 0x0F);

  1411. 

  1412.                     for (count2=0; count2<28; count2++) {

  1413.                         if (count2 & 1)

  1414.                             next_sample = (unsigned)sign_extend(byte,    4) << shift;

  1415.                         else {

  1416.                             byte = bytestream2_get_byte(&gb);

  1417.                             next_sample = (unsigned)sign_extend(byte >> 4, 4) << shift;

  1418.                         }

  1419. 

  1420.                         next_sample += (current_sample  * coeff1) +

  1421.                                        (previous_sample * coeff2);

  1422.                         next_sample = av_clip_int16(next_sample >> 8);

  1423. 

  1424.                         previous_sample = current_sample;

  1425.                         current_sample  = next_sample;

  1426.                         *samplesC++ = current_sample;

  1427.                     }

  1428.                 }

  1429.             }

  1430.             if (!count) {

  1431.                 count = count1;

  1432.             } else if (count != count1) {

  1433.                 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");

  1434.                 count = FFMAX(count, count1);

  1435.             }

  1436. 

  1437.             if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {

  1438.                 c->status[channel].predictor   = current_sample;

  1439.                 c->status[channel].prev_sample = previous_sample;

  1440.             }

  1441.         }

  1442. 

  1443.         frame->nb_samples = count * 28;

  1444.         bytestream2_seek(&gb, 0, SEEK_END);

  1445.         break;

  1446.     }

  1447.     case AV_CODEC_ID_ADPCM_EA_XAS:

  1448.         for (channel=0; channel<avctx->channels; channel++) {

  1449.             int coeff[2][4], shift[4];

  1450.             int16_t *s = samples_p[channel];

  1451.             for (n = 0; n < 4; n++, s += 32) {

  1452.                 int val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1453.                 for (i=0; i<2; i++)

  1454.                     coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];

  1455.                 s[0] = val & ~0x0F;

  1456. 

  1457.                 val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1458.                 shift[n] = 20 - (val & 0x0F);

  1459.                 s[1] = val & ~0x0F;

  1460.             }

  1461. 

  1462.             for (m=2; m<32; m+=2) {

  1463.                 s = &samples_p[channel][m];

  1464.                 for (n = 0; n < 4; n++, s += 32) {

  1465.                     int level, pred;

  1466.                     int byte = bytestream2_get_byteu(&gb);

  1467. 

  1468.                     level = sign_extend(byte >> 4, 4) * (1 << shift[n]);

  1469.                     pred  = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];

  1470.                     s[0]  = av_clip_int16((level + pred + 0x80) >> 8);

  1471. 

  1472.                     level = sign_extend(byte, 4) * (1 << shift[n]);

  1473.                     pred  = s[0] * coeff[0][n] + s[-1] * coeff[1][n];

  1474.                     s[1]  = av_clip_int16((level + pred + 0x80) >> 8);

  1475.                 }

  1476.             }

  1477.         }

  1478.         break;

  1479.     case AV_CODEC_ID_ADPCM_IMA_AMV:

  1480.         c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  1481.         c->status[0].step_index = bytestream2_get_byteu(&gb);

  1482.         bytestream2_skipu(&gb, 5);

  1483.         if (c->status[0].step_index > 88u) {

  1484.             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1485.                    c->status[0].step_index);

  1486.             return AVERROR_INVALIDDATA;

  1487.         }

  1488. 

  1489.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1490.             int v = bytestream2_get_byteu(&gb);

  1491. 

  1492.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);

  1493.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);

  1494.         }

  1495.         break;

  1496.     case AV_CODEC_ID_ADPCM_IMA_SMJPEG:

  1497.         for (i = 0; i < avctx->channels; i++) {

  1498.             c->status[i].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);

  1499.             c->status[i].step_index = bytestream2_get_byteu(&gb);

  1500.             bytestream2_skipu(&gb, 1);

  1501.             if (c->status[i].step_index > 88u) {

  1502.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1503.                        c->status[i].step_index);

  1504.                 return AVERROR_INVALIDDATA;

  1505.             }

  1506.         }

  1507. 

  1508.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1509.             int v = bytestream2_get_byteu(&gb);

  1510. 

  1511.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[0 ], v >> 4, 3);

  1512.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0xf, 3);

  1513.         }

  1514.         break;

  1515.     case AV_CODEC_ID_ADPCM_CT:

  1516.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1517.             int v = bytestream2_get_byteu(&gb);

  1518.             *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4  );

  1519.             *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);

  1520.         }

  1521.         break;

  1522.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  1523.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  1524.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  1525.         if (!c->status[0].step_index) {

  1526.             /* the first byte is a raw sample */

  1527.             *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1528.             if (st)

  1529.                 *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1530.             c->status[0].step_index = 1;

  1531.             nb_samples--;

  1532.         }

  1533.         if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {

  1534.             for (n = nb_samples >> (1 - st); n > 0; n--) {

  1535.                 int byte = bytestream2_get_byteu(&gb);

  1536.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1537.                                                        byte >> 4,   4, 0);

  1538.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1539.                                                        byte & 0x0F, 4, 0);

  1540.             }

  1541.         } else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {

  1542.             for (n = (nb_samples<<st) / 3; n > 0; n--) {

  1543.                 int byte = bytestream2_get_byteu(&gb);

  1544.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1545.                                                         byte >> 5        , 3, 0);

  1546.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1547.                                                        (byte >> 2) & 0x07, 3, 0);

  1548.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1549.                                                         byte & 0x03,       2, 0);

  1550.             }

  1551.         } else {

  1552.             for (n = nb_samples >> (2 - st); n > 0; n--) {

  1553.                 int byte = bytestream2_get_byteu(&gb);

  1554.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1555.                                                         byte >> 6        , 2, 2);

  1556.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1557.                                                        (byte >> 4) & 0x03, 2, 2);

  1558.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1559.                                                        (byte >> 2) & 0x03, 2, 2);

  1560.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1561.                                                         byte & 0x03,       2, 2);

  1562.             }

  1563.         }

  1564.         break;

  1565.     case AV_CODEC_ID_ADPCM_SWF:

  1566.         adpcm_swf_decode(avctx, buf, buf_size, samples);

  1567.         bytestream2_seek(&gb, 0, SEEK_END);

  1568.         break;

  1569.     case AV_CODEC_ID_ADPCM_YAMAHA:

  1570.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1571.             int v = bytestream2_get_byteu(&gb);

  1572.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);

  1573.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4  );

  1574.         }

  1575.         break;

  1576.     case AV_CODEC_ID_ADPCM_AICA:

  1577.         if (!c->has_status) {

  1578.             for (channel = 0; channel < avctx->channels; channel++)

  1579.                 c->status[channel].step = 0;

  1580.             c->has_status = 1;

  1581.         }

  1582.         for (channel = 0; channel < avctx->channels; channel++) {

  1583.             samples = samples_p[channel];

  1584.             for (n = nb_samples >> 1; n > 0; n--) {

  1585.                 int v = bytestream2_get_byteu(&gb);

  1586.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v & 0x0F);

  1587.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v >> 4  );

  1588.             }

  1589.         }

  1590.         break;

  1591.     case AV_CODEC_ID_ADPCM_AFC:

  1592.     {

  1593.         int samples_per_block;

  1594.         int blocks;

  1595. 

  1596.         if (avctx->extradata && avctx->extradata_size == 1 && avctx->extradata[0]) {

  1597.             samples_per_block = avctx->extradata[0] / 16;

  1598.             blocks = nb_samples / avctx->extradata[0];

  1599.         } else {

  1600.             samples_per_block = nb_samples / 16;

  1601.             blocks = 1;

  1602.         }

  1603. 

  1604.         for (m = 0; m < blocks; m++) {

  1605.         for (channel = 0; channel < avctx->channels; channel++) {

  1606.             int prev1 = c->status[channel].sample1;

  1607.             int prev2 = c->status[channel].sample2;

  1608. 

  1609.             samples = samples_p[channel] + m * 16;

  1610.             /* Read in every sample for this channel.  */

  1611.             for (i = 0; i < samples_per_block; i++) {

  1612.                 int byte = bytestream2_get_byteu(&gb);

  1613.                 int scale = 1 << (byte >> 4);

  1614.                 int index = byte & 0xf;

  1615.                 int factor1 = ff_adpcm_afc_coeffs[0][index];

  1616.                 int factor2 = ff_adpcm_afc_coeffs[1][index];

  1617. 

  1618.                 /* Decode 16 samples.  */

  1619.                 for (n = 0; n < 16; n++) {

  1620.                     int32_t sampledat;

  1621. 

  1622.                     if (n & 1) {

  1623.                         sampledat = sign_extend(byte, 4);

  1624.                     } else {

  1625.                         byte = bytestream2_get_byteu(&gb);

  1626.                         sampledat = sign_extend(byte >> 4, 4);

  1627.                     }

  1628. 

  1629.                     sampledat = ((prev1 * factor1 + prev2 * factor2) >> 11) +

  1630.                                 sampledat * scale;

  1631.                     *samples = av_clip_int16(sampledat);

  1632.                     prev2 = prev1;

  1633.                     prev1 = *samples++;

  1634.                 }

  1635.             }

  1636. 

  1637.             c->status[channel].sample1 = prev1;

  1638.             c->status[channel].sample2 = prev2;

  1639.         }

  1640.         }

  1641.         bytestream2_seek(&gb, 0, SEEK_END);

  1642.         break;

  1643.     }

  1644.     case AV_CODEC_ID_ADPCM_THP:

  1645.     case AV_CODEC_ID_ADPCM_THP_LE:

  1646.     {

  1647.         int table[14][16];

  1648.         int ch;

  1649. 

  1650. #define THP_GET16(g) \

  1651.     sign_extend( \

  1652.         avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE ? \

  1653.         bytestream2_get_le16u(&(g)) : \

  1654.         bytestream2_get_be16u(&(g)), 16)

  1655. 

  1656.         if (avctx->extradata) {

  1657.             GetByteContext tb;

  1658.             if (avctx->extradata_size < 32 * avctx->channels) {

  1659.                 av_log(avctx, AV_LOG_ERROR, "Missing coeff table\n");

  1660.                 return AVERROR_INVALIDDATA;

  1661.             }

  1662. 

  1663.             bytestream2_init(&tb, avctx->extradata, avctx->extradata_size);

  1664.             for (i = 0; i < avctx->channels; i++)

  1665.                 for (n = 0; n < 16; n++)

  1666.                     table[i][n] = THP_GET16(tb);

  1667.         } else {

  1668.             for (i = 0; i < avctx->channels; i++)

  1669.                 for (n = 0; n < 16; n++)

  1670.                     table[i][n] = THP_GET16(gb);

  1671. 

  1672.             if (!c->has_status) {

  1673.                 /* Initialize the previous sample.  */

  1674.                 for (i = 0; i < avctx->channels; i++) {

  1675.                     c->status[i].sample1 = THP_GET16(gb);

  1676.                     c->status[i].sample2 = THP_GET16(gb);

  1677.                 }

  1678.                 c->has_status = 1;

  1679.             } else {

  1680.                 bytestream2_skip(&gb, avctx->channels * 4);

  1681.             }

  1682.         }

  1683. 

  1684.         for (ch = 0; ch < avctx->channels; ch++) {

  1685.             samples = samples_p[ch];

  1686. 

  1687.             /* Read in every sample for this channel.  */

  1688.             for (i = 0; i < (nb_samples + 13) / 14; i++) {

  1689.                 int byte = bytestream2_get_byteu(&gb);

  1690.                 int index = (byte >> 4) & 7;

  1691.                 unsigned int exp = byte & 0x0F;

  1692.                 int factor1 = table[ch][index * 2];

  1693.                 int factor2 = table[ch][index * 2 + 1];

  1694. 

  1695.                 /* Decode 14 samples.  */

  1696.                 for (n = 0; n < 14 && (i * 14 + n < nb_samples); n++) {

  1697.                     int32_t sampledat;

  1698. 

  1699.                     if (n & 1) {

  1700.                         sampledat = sign_extend(byte, 4);

  1701.                     } else {

  1702.                         byte = bytestream2_get_byteu(&gb);

  1703.                         sampledat = sign_extend(byte >> 4, 4);

  1704.                     }

  1705. 

  1706.                     sampledat = ((c->status[ch].sample1 * factor1

  1707.                                 + c->status[ch].sample2 * factor2) >> 11) + sampledat * (1 << exp);

  1708.                     *samples = av_clip_int16(sampledat);

  1709.                     c->status[ch].sample2 = c->status[ch].sample1;

  1710.                     c->status[ch].sample1 = *samples++;

  1711.                 }

  1712.             }

  1713.         }

  1714.         break;

  1715.     }

  1716.     case AV_CODEC_ID_ADPCM_DTK:

  1717.         for (channel = 0; channel < avctx->channels; channel++) {

  1718.             samples = samples_p[channel];

  1719. 

  1720.             /* Read in every sample for this channel.  */

  1721.             for (i = 0; i < nb_samples / 28; i++) {

  1722.                 int byte, header;

  1723.                 if (channel)

  1724.                     bytestream2_skipu(&gb, 1);

  1725.                 header = bytestream2_get_byteu(&gb);

  1726.                 bytestream2_skipu(&gb, 3 - channel);

  1727. 

  1728.                 /* Decode 28 samples.  */

  1729.                 for (n = 0; n < 28; n++) {

  1730.                     int32_t sampledat, prev;

  1731. 

  1732.                     switch (header >> 4) {

  1733.                     case 1:

  1734.                         prev = (c->status[channel].sample1 * 0x3c);

  1735.                         break;

  1736.                     case 2:

  1737.                         prev = (c->status[channel].sample1 * 0x73) - (c->status[channel].sample2 * 0x34);

  1738.                         break;

  1739.                     case 3:

  1740.                         prev = (c->status[channel].sample1 * 0x62) - (c->status[channel].sample2 * 0x37);

  1741.                         break;

  1742.                     default:

  1743.                         prev = 0;

  1744.                     }

  1745. 

  1746.                     prev = av_clip_intp2((prev + 0x20) >> 6, 21);

  1747. 

  1748.                     byte = bytestream2_get_byteu(&gb);

  1749.                     if (!channel)

  1750.                         sampledat = sign_extend(byte, 4);

  1751.                     else

  1752.                         sampledat = sign_extend(byte >> 4, 4);

  1753. 

  1754.                     sampledat = ((sampledat * (1 << 12)) >> (header & 0xf)) * (1 << 6) + prev;

  1755.                     *samples++ = av_clip_int16(sampledat >> 6);

  1756.                     c->status[channel].sample2 = c->status[channel].sample1;

  1757.                     c->status[channel].sample1 = sampledat;

  1758.                 }

  1759.             }

  1760.             if (!channel)

  1761.                 bytestream2_seek(&gb, 0, SEEK_SET);

  1762.         }

  1763.         break;

  1764.     case AV_CODEC_ID_ADPCM_PSX:

  1765.         for (channel = 0; channel < avctx->channels; channel++) {

  1766.             samples = samples_p[channel];

  1767. 

  1768.             /* Read in every sample for this channel.  */

  1769.             for (i = 0; i < nb_samples / 28; i++) {

  1770.                 int filter, shift, flag, byte;

  1771. 

  1772.                 filter = bytestream2_get_byteu(&gb);

  1773.                 shift  = filter & 0xf;

  1774.                 filter = filter >> 4;

  1775.                 if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table))

  1776.                     return AVERROR_INVALIDDATA;

  1777.                 flag   = bytestream2_get_byteu(&gb);

  1778. 

  1779.                 /* Decode 28 samples.  */

  1780.                 for (n = 0; n < 28; n++) {

  1781.                     int sample = 0, scale;

  1782. 

  1783.                     if (flag < 0x07) {

  1784.                         if (n & 1) {

  1785.                             scale = sign_extend(byte >> 4, 4);

  1786.                         } else {

  1787.                             byte  = bytestream2_get_byteu(&gb);

  1788.                             scale = sign_extend(byte, 4);

  1789.                         }

  1790. 

  1791.                         scale  = scale << 12;

  1792.                         sample = (int)((scale >> shift) + (c->status[channel].sample1 * xa_adpcm_table[filter][0] + c->status[channel].sample2 * xa_adpcm_table[filter][1]) / 64);

  1793.                     }

  1794.                     *samples++ = av_clip_int16(sample);

  1795.                     c->status[channel].sample2 = c->status[channel].sample1;

  1796.                     c->status[channel].sample1 = sample;

  1797.                 }

  1798.             }

  1799.         }

  1800.         break;

  1801.     case AV_CODEC_ID_ADPCM_ARGO:

  1802.         /*

  1803.          * The format of each block:

  1804.          *   uint8_t left_control;

  1805.          *   uint4_t left_samples[nb_samples];

  1806.          *   ---- and if stereo ----

  1807.          *   uint8_t right_control;

  1808.          *   uint4_t right_samples[nb_samples];

  1809.          *

  1810.          * Format of the control byte:

  1811.          * MSB [SSSSDRRR] LSB

  1812.          *   S = (Shift Amount - 2)

  1813.          *   D = Decoder flag.

  1814.          *   R = Reserved

  1815.          *

  1816.          * Each block relies on the previous two samples of each channel.

  1817.          * They should be 0 initially.

  1818.          */

  1819.         for (channel = 0; channel < avctx->channels; channel++) {

  1820.             int control, shift;

  1821. 

  1822.             samples = samples_p[channel];

  1823.             cs = c->status + channel;

  1824. 

  1825.             /* Get the control byte and decode the samples, 2 at a time. */

  1826.             control = bytestream2_get_byteu(&gb);

  1827.             shift = (control >> 4) + 2;

  1828. 

  1829.             for (n = 0; n < nb_samples / 2; n++) {

  1830.                 int sample = bytestream2_get_byteu(&gb);

  1831.                 *samples++ = adpcm_argo_expand_nibble(cs, sign_extend(sample >> 4, 4), control, shift);

  1832.                 *samples++ = adpcm_argo_expand_nibble(cs, sign_extend(sample >> 0, 4), control, shift);

  1833.             }

  1834.         }

  1835.         break;

  1836.     default:

  1837.         av_assert0(0); // unsupported codec_id should not happen

  1838.     }

  1839. 

  1840.     if (avpkt->size && bytestream2_tell(&gb) == 0) {

  1841.         av_log(avctx, AV_LOG_ERROR, "Nothing consumed\n");

  1842.         return AVERROR_INVALIDDATA;

  1843.     }

  1844. 

  1845.     *got_frame_ptr = 1;

  1846. 

  1847.     if (avpkt->size < bytestream2_tell(&gb)) {

  1848.         av_log(avctx, AV_LOG_ERROR, "Overread of %d < %d\n", avpkt->size, bytestream2_tell(&gb));

  1849.         return avpkt->size;

  1850.     }

  1851. 

  1852.     return bytestream2_tell(&gb);

  1853. }

  1854. 

  1855. static void adpcm_flush(AVCodecContext *avctx)

  1856. {

  1857.     ADPCMDecodeContext *c = avctx->priv_data;

  1858.     c->has_status = 0;

  1859. }

  1860. 

  1861. 

  1862. static const enum AVSampleFormat sample_fmts_s16[]  = { AV_SAMPLE_FMT_S16,

  1863.                                                         AV_SAMPLE_FMT_NONE };

  1864. static const enum AVSampleFormat sample_fmts_s16p[] = { AV_SAMPLE_FMT_S16P,

  1865.                                                         AV_SAMPLE_FMT_NONE };

  1866. static const enum AVSampleFormat sample_fmts_both[] = { AV_SAMPLE_FMT_S16,

  1867.                                                         AV_SAMPLE_FMT_S16P,

  1868.                                                         AV_SAMPLE_FMT_NONE };

  1869. 

  1870. #define ADPCM_DECODER(id_, sample_fmts_, name_, long_name_) \

  1871. AVCodec ff_ ## name_ ## _decoder = {                        \

  1872.     .name           = #name_,                               \

  1873.     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \

  1874.     .type           = AVMEDIA_TYPE_AUDIO,                   \

  1875.     .id             = id_,                                  \

  1876.     .priv_data_size = sizeof(ADPCMDecodeContext),           \

  1877.     .init           = adpcm_decode_init,                    \

  1878.     .decode         = adpcm_decode_frame,                   \

  1879.     .flush          = adpcm_flush,                          \

  1880.     .capabilities   = AV_CODEC_CAP_DR1,                     \

  1881.     .sample_fmts    = sample_fmts_,                         \

  1882. }

  1883. 

  1884. /* Note: Do not forget to add new entries to the Makefile as well. */

  1885. ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM,         sample_fmts_s16p, adpcm_4xm,         "ADPCM 4X Movie");

  1886. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AFC,         sample_fmts_s16p, adpcm_afc,         "ADPCM Nintendo Gamecube AFC");

  1887. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AGM,         sample_fmts_s16,  adpcm_agm,         "ADPCM AmuseGraphics Movie");

  1888. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AICA,        sample_fmts_s16p, adpcm_aica,        "ADPCM Yamaha AICA");

  1889. ADPCM_DECODER(AV_CODEC_ID_ADPCM_ARGO,        sample_fmts_s16p, adpcm_argo,        "ADPCM Argonaut Games");

  1890. ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT,          sample_fmts_s16,  adpcm_ct,          "ADPCM Creative Technology");

  1891. ADPCM_DECODER(AV_CODEC_ID_ADPCM_DTK,         sample_fmts_s16p, adpcm_dtk,         "ADPCM Nintendo Gamecube DTK");

  1892. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA,          sample_fmts_s16,  adpcm_ea,          "ADPCM Electronic Arts");

  1893. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, sample_fmts_s16,  adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");

  1894. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1,       sample_fmts_s16p, adpcm_ea_r1,       "ADPCM Electronic Arts R1");

  1895. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2,       sample_fmts_s16p, adpcm_ea_r2,       "ADPCM Electronic Arts R2");

  1896. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3,       sample_fmts_s16p, adpcm_ea_r3,       "ADPCM Electronic Arts R3");

  1897. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS,      sample_fmts_s16p, adpcm_ea_xas,      "ADPCM Electronic Arts XAS");

  1898. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV,     sample_fmts_s16,  adpcm_ima_amv,     "ADPCM IMA AMV");

  1899. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC,     sample_fmts_s16,  adpcm_ima_apc,     "ADPCM IMA CRYO APC");

  1900. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DAT4,    sample_fmts_s16,  adpcm_ima_dat4,    "ADPCM IMA Eurocom DAT4");

  1901. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3,     sample_fmts_s16,  adpcm_ima_dk3,     "ADPCM IMA Duck DK3");

  1902. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4,     sample_fmts_s16,  adpcm_ima_dk4,     "ADPCM IMA Duck DK4");

  1903. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, sample_fmts_s16,  adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");

  1904. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, sample_fmts_s16,  adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");

  1905. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS,     sample_fmts_s16,  adpcm_ima_iss,     "ADPCM IMA Funcom ISS");

  1906. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI,     sample_fmts_s16,  adpcm_ima_oki,     "ADPCM IMA Dialogic OKI");

  1907. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT,      sample_fmts_s16p, adpcm_ima_qt,      "ADPCM IMA QuickTime");

  1908. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_RAD,     sample_fmts_s16,  adpcm_ima_rad,     "ADPCM IMA Radical");

  1909. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG,  sample_fmts_s16,  adpcm_ima_smjpeg,  "ADPCM IMA Loki SDL MJPEG");

  1910. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV,     sample_fmts_s16p, adpcm_ima_wav,     "ADPCM IMA WAV");

  1911. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS,      sample_fmts_both, adpcm_ima_ws,      "ADPCM IMA Westwood");

  1912. ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS,          sample_fmts_both, adpcm_ms,          "ADPCM Microsoft");

  1913. ADPCM_DECODER(AV_CODEC_ID_ADPCM_MTAF,        sample_fmts_s16p, adpcm_mtaf,        "ADPCM MTAF");

  1914. ADPCM_DECODER(AV_CODEC_ID_ADPCM_PSX,         sample_fmts_s16p, adpcm_psx,         "ADPCM Playstation");

  1915. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2,     sample_fmts_s16,  adpcm_sbpro_2,     "ADPCM Sound Blaster Pro 2-bit");

  1916. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3,     sample_fmts_s16,  adpcm_sbpro_3,     "ADPCM Sound Blaster Pro 2.6-bit");

  1917. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4,     sample_fmts_s16,  adpcm_sbpro_4,     "ADPCM Sound Blaster Pro 4-bit");

  1918. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF,         sample_fmts_s16,  adpcm_swf,         "ADPCM Shockwave Flash");

  1919. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP_LE,      sample_fmts_s16p, adpcm_thp_le,      "ADPCM Nintendo THP (little-endian)");

  1920. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP,         sample_fmts_s16p, adpcm_thp,         "ADPCM Nintendo THP");

  1921. ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA,          sample_fmts_s16p, adpcm_xa,          "ADPCM CDROM XA");

  1922. ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA,      sample_fmts_s16,  adpcm_yamaha,      "ADPCM Yamaha");