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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.  *

  16.  * This file is part of FFmpeg.

  17.  *

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

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

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

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

  22.  *

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

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

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

  26.  * Lesser General Public License for more details.

  27.  *

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

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

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

  31.  */

  32. #include "avcodec.h"

  33. #include "get_bits.h"

  34. #include "bytestream.h"

  35. #include "adpcm.h"

  36. #include "adpcm_data.h"

  37. #include "internal.h"

  38. 

  39. /**

  40.  * @file

  41.  * ADPCM decoders

  42.  * Features and limitations:

  43.  *

  44.  * Reference documents:

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

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

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

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

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

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

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

  52.  *

  53.  * CD-ROM XA:

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

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

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

  57.  */

  58. 

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

  60. static const int xa_adpcm_table[5][2] = {

  61.     {   0,   0 },

  62.     {  60,   0 },

  63.     { 115, -52 },

  64.     {  98, -55 },

  65.     { 122, -60 }

  66. };

  67. 

  68. static const int ea_adpcm_table[] = {

  69.     0,  240,  460,  392,

  70.     0,    0, -208, -220,

  71.     0,    1,    3,    4,

  72.     7,    8,   10,   11,

  73.     0,   -1,   -3,   -4

  74. };

  75. 

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

  77. static const int swf_index_tables[4][16] = {

  78.     /*2*/ { -1, 2 },

  79.     /*3*/ { -1, -1, 2, 4 },

  80.     /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },

  81.     /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }

  82. };

  83. 

  84. /* end of tables */

  85. 

  86. typedef struct ADPCMDecodeContext {

  87.     ADPCMChannelStatus status[14];

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

  89.     int has_status;

  90. } ADPCMDecodeContext;

  91. 

  92. static av_cold int adpcm_decode_init(AVCodecContext * avctx)

  93. {

  94.     ADPCMDecodeContext *c = avctx->priv_data;

  95.     unsigned int min_channels = 1;

  96.     unsigned int max_channels = 2;

  97. 

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

  99.     case AV_CODEC_ID_ADPCM_DTK:

  100.     case AV_CODEC_ID_ADPCM_EA:

  101.         min_channels = 2;

  102.         break;

  103.     case AV_CODEC_ID_ADPCM_AFC:

  104.     case AV_CODEC_ID_ADPCM_EA_R1:

  105.     case AV_CODEC_ID_ADPCM_EA_R2:

  106.     case AV_CODEC_ID_ADPCM_EA_R3:

  107.     case AV_CODEC_ID_ADPCM_EA_XAS:

  108.         max_channels = 6;

  109.         break;

  110.     case AV_CODEC_ID_ADPCM_MTAF:

  111.         min_channels = 2;

  112.         max_channels = 8;

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

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

  115.             return AVERROR_PATCHWELCOME;

  116.         }

  117.         break;

  118.     case AV_CODEC_ID_ADPCM_PSX:

  119.         max_channels = 8;

  120.         break;

  121.     case AV_CODEC_ID_ADPCM_IMA_DAT4:

  122.     case AV_CODEC_ID_ADPCM_THP:

  123.     case AV_CODEC_ID_ADPCM_THP_LE:

  124.         max_channels = 14;

  125.         break;

  126.     }

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

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

  129.         return AVERROR(EINVAL);

  130.     }

  131. 

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

  133.     case AV_CODEC_ID_ADPCM_CT:

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

  135.         break;

  136.     case AV_CODEC_ID_ADPCM_IMA_WAV:

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

  138.             return AVERROR_INVALIDDATA;

  139.         break;

  140.     case AV_CODEC_ID_ADPCM_IMA_APC:

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

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

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

  144.         }

  145.         break;

  146.     case AV_CODEC_ID_ADPCM_IMA_WS:

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

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

  149.         break;

  150.     default:

  151.         break;

  152.     }

  153. 

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

  155.         case AV_CODEC_ID_ADPCM_AICA:

  156.         case AV_CODEC_ID_ADPCM_IMA_DAT4:

  157.         case AV_CODEC_ID_ADPCM_IMA_QT:

  158.         case AV_CODEC_ID_ADPCM_IMA_WAV:

  159.         case AV_CODEC_ID_ADPCM_4XM:

  160.         case AV_CODEC_ID_ADPCM_XA:

  161.         case AV_CODEC_ID_ADPCM_EA_R1:

  162.         case AV_CODEC_ID_ADPCM_EA_R2:

  163.         case AV_CODEC_ID_ADPCM_EA_R3:

  164.         case AV_CODEC_ID_ADPCM_EA_XAS:

  165.         case AV_CODEC_ID_ADPCM_THP:

  166.         case AV_CODEC_ID_ADPCM_THP_LE:

  167.         case AV_CODEC_ID_ADPCM_AFC:

  168.         case AV_CODEC_ID_ADPCM_DTK:

  169.         case AV_CODEC_ID_ADPCM_PSX:

  170.         case AV_CODEC_ID_ADPCM_MTAF:

  171.             avctx->sample_fmt = AV_SAMPLE_FMT_S16P;

  172.             break;

  173.         case AV_CODEC_ID_ADPCM_IMA_WS:

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

  175.                                                       AV_SAMPLE_FMT_S16;

  176.             break;

  177.         default:

  178.             avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  179.     }

  180. 

  181.     return 0;

  182. }

  183. 

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

  185. {

  186.     int step_index;

  187.     int predictor;

  188.     int sign, delta, diff, step;

  189. 

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

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

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

  193. 

  194.     sign = nibble & 8;

  195.     delta = nibble & 7;

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

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

  198.      * quickly enough */

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

  200.     predictor = c->predictor;

  201.     if (sign) predictor -= diff;

  202.     else predictor += diff;

  203. 

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

  205.     c->step_index = step_index;

  206. 

  207.     return (int16_t)c->predictor;

  208. }

  209. 

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

  211. {

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

  213. 

  214.     shift = bps - 1;

  215.     nibble = get_bits_le(gb, bps),

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

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

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

  219. 

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

  221.     delta = av_mod_uintp2(nibble, shift);

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

  223.     predictor = c->predictor;

  224.     if (sign) predictor -= diff;

  225.     else predictor += diff;

  226. 

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

  228.     c->step_index = step_index;

  229. 

  230.     return (int16_t)c->predictor;

  231. }

  232. 

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

  234. {

  235.     int step_index;

  236.     int predictor;

  237.     int diff, step;

  238. 

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

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

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

  242. 

  243.     diff = step >> 3;

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

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

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

  247. 

  248.     if (nibble & 8)

  249.         predictor = c->predictor - diff;

  250.     else

  251.         predictor = c->predictor + diff;

  252. 

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

  254.     c->step_index = step_index;

  255. 

  256.     return c->predictor;

  257. }

  258. 

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

  260. {

  261.     int predictor;

  262. 

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

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

  265. 

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

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

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

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

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

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

  272.         c->idelta = INT_MAX/768;

  273.     }

  274. 

  275.     return c->sample1;

  276. }

  277. 

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

  279. {

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

  281. 

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

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

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

  285. 

  286.     sign = nibble & 8;

  287.     delta = nibble & 7;

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

  289.     predictor = c->predictor;

  290.     if (sign) predictor -= diff;

  291.     else predictor += diff;

  292. 

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

  294.     c->step_index = step_index;

  295. 

  296.     return c->predictor * 16;

  297. }

  298. 

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

  300. {

  301.     int sign, delta, diff;

  302.     int new_step;

  303. 

  304.     sign = nibble & 8;

  305.     delta = nibble & 7;

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

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

  308.      * quickly enough */

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

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

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

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

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

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

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

  316. 

  317.     return (int16_t)c->predictor;

  318. }

  319. 

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

  321. {

  322.     int sign, delta, diff;

  323. 

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

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

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

  327. 

  328.     /* clamp result */

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

  330. 

  331.     /* calculate new step */

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

  333.         c->step++;

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

  335.         c->step--;

  336. 

  337.     return (int16_t) c->predictor;

  338. }

  339. 

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

  341. {

  342.     if(!c->step) {

  343.         c->predictor = 0;

  344.         c->step = 127;

  345.     }

  346. 

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

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

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

  350.     c->step = av_clip(c->step, 127, 24567);

  351.     return c->predictor;

  352. }

  353. 

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

  355. {

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

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

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

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

  360.     return c->predictor;

  361. }

  362. 

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

  364.                      const uint8_t *in, ADPCMChannelStatus *left,

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

  366. {

  367.     int i, j;

  368.     int shift,filter,f0,f1;

  369.     int s_1,s_2;

  370.     int d,s,t;

  371. 

  372.     out0 += sample_offset;

  373.     if (channels == 1)

  374.         out1 = out0 + 28;

  375.     else

  376.         out1 += sample_offset;

  377. 

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

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

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

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

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

  383.             filter=0;

  384.         }

  385.         if (shift < 0) {

  386.             avpriv_request_sample(avctx, "unknown XA-ADPCM shift %d", shift);

  387.             shift = 0;

  388.         }

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

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

  391. 

  392.         s_1 = left->sample1;

  393.         s_2 = left->sample2;

  394. 

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

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

  397. 

  398.             t = sign_extend(d, 4);

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

  400.             s_2 = s_1;

  401.             s_1 = av_clip_int16(s);

  402.             out0[j] = s_1;

  403.         }

  404. 

  405.         if (channels == 2) {

  406.             left->sample1 = s_1;

  407.             left->sample2 = s_2;

  408.             s_1 = right->sample1;

  409.             s_2 = right->sample2;

  410.         }

  411. 

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

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

  414.         if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table) || shift < 0) {

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

  416.             filter=0;

  417.         }

  418.         if (shift < 0) {

  419.             avpriv_request_sample(avctx, "unknown XA-ADPCM shift %d", shift);

  420.             shift = 0;

  421.         }

  422. 

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

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

  425. 

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

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

  428. 

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

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

  431.             s_2 = s_1;

  432.             s_1 = av_clip_int16(s);

  433.             out1[j] = s_1;

  434.         }

  435. 

  436.         if (channels == 2) {

  437.             right->sample1 = s_1;

  438.             right->sample2 = s_2;

  439.         } else {

  440.             left->sample1 = s_1;

  441.             left->sample2 = s_2;

  442.         }

  443. 

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

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

  446.     }

  447. 

  448.     return 0;

  449. }

  450. 

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

  452. {

  453.     ADPCMDecodeContext *c = avctx->priv_data;

  454.     GetBitContext gb;

  455.     const int *table;

  456.     int k0, signmask, nb_bits, count;

  457.     int size = buf_size*8;

  458.     int i;

  459. 

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

  461. 

  462.     //read bits & initial values

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

  464.     table = swf_index_tables[nb_bits-2];

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

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

  467. 

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

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

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

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

  472.         }

  473. 

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

  475.             int i;

  476. 

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

  478.                 // similar to IMA adpcm

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

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

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

  482.                 int k = k0;

  483. 

  484.                 do {

  485.                     if (delta & k)

  486.                         vpdiff += step;

  487.                     step >>= 1;

  488.                     k >>= 1;

  489.                 } while(k);

  490.                 vpdiff += step;

  491. 

  492.                 if (delta & signmask)

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

  494.                 else

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

  496. 

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

  498. 

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

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

  501. 

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

  503.             }

  504.         }

  505.     }

  506. }

  507. 

  508. /**

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

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

  511.  * decode with the given buf_size.

  512.  *

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

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

  515.  *                           number of samples in each frame.

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

  517.  *                               returned is an approximation.

  518.  */

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

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

  521. {

  522.     ADPCMDecodeContext *s = avctx->priv_data;

  523.     int nb_samples        = 0;

  524.     int ch                = avctx->channels;

  525.     int has_coded_samples = 0;

  526.     int header_size;

  527. 

  528.     *coded_samples = 0;

  529.     *approx_nb_samples = 0;

  530. 

  531.     if(ch <= 0)

  532.         return 0;

  533. 

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

  535.     /* constant, only check buf_size */

  536.     case AV_CODEC_ID_ADPCM_EA_XAS:

  537.         if (buf_size < 76 * ch)

  538.             return 0;

  539.         nb_samples = 128;

  540.         break;

  541.     case AV_CODEC_ID_ADPCM_IMA_QT:

  542.         if (buf_size < 34 * ch)

  543.             return 0;

  544.         nb_samples = 64;

  545.         break;

  546.     /* simple 4-bit adpcm */

  547.     case AV_CODEC_ID_ADPCM_CT:

  548.     case AV_CODEC_ID_ADPCM_IMA_APC:

  549.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  550.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  551.     case AV_CODEC_ID_ADPCM_IMA_WS:

  552.     case AV_CODEC_ID_ADPCM_YAMAHA:

  553.     case AV_CODEC_ID_ADPCM_AICA:

  554.         nb_samples = buf_size * 2 / ch;

  555.         break;

  556.     }

  557.     if (nb_samples)

  558.         return nb_samples;

  559. 

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

  561.     header_size = 0;

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

  563.         case AV_CODEC_ID_ADPCM_4XM:

  564.         case AV_CODEC_ID_ADPCM_IMA_DAT4:

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

  566.         case AV_CODEC_ID_ADPCM_IMA_AMV:     header_size = 8;           break;

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

  568.     }

  569.     if (header_size > 0)

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

  571. 

  572.     /* more complex formats */

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

  574.     case AV_CODEC_ID_ADPCM_EA:

  575.         has_coded_samples = 1;

  576.         *coded_samples  = bytestream2_get_le32(gb);

  577.         *coded_samples -= *coded_samples % 28;

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

  579.         break;

  580.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  581.         has_coded_samples = 1;

  582.         *coded_samples = bytestream2_get_le32(gb);

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

  584.         break;

  585.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

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

  587.         break;

  588.     case AV_CODEC_ID_ADPCM_EA_R1:

  589.     case AV_CODEC_ID_ADPCM_EA_R2:

  590.     case AV_CODEC_ID_ADPCM_EA_R3:

  591.         /* maximum number of samples */

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

  593.         has_coded_samples = 1;

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

  595.         case AV_CODEC_ID_ADPCM_EA_R1:

  596.             header_size    = 4 + 9 * ch;

  597.             *coded_samples = bytestream2_get_le32(gb);

  598.             break;

  599.         case AV_CODEC_ID_ADPCM_EA_R2:

  600.             header_size    = 4 + 5 * ch;

  601.             *coded_samples = bytestream2_get_le32(gb);

  602.             break;

  603.         case AV_CODEC_ID_ADPCM_EA_R3:

  604.             header_size    = 4 + 5 * ch;

  605.             *coded_samples = bytestream2_get_be32(gb);

  606.             break;

  607.         }

  608.         *coded_samples -= *coded_samples % 28;

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

  610.         nb_samples     -= nb_samples % 28;

  611.         *approx_nb_samples = 1;

  612.         break;

  613.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  614.         if (avctx->block_align > 0)

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

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

  617.         break;

  618.     case AV_CODEC_ID_ADPCM_IMA_DK4:

  619.         if (avctx->block_align > 0)

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

  621.         if (buf_size < 4 * ch)

  622.             return AVERROR_INVALIDDATA;

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

  624.         break;

  625.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  626.         if (avctx->block_align > 0)

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

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

  629.         break;

  630.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  631.     {

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

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

  634.         if (avctx->block_align > 0)

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

  636.         if (buf_size < 4 * ch)

  637.             return AVERROR_INVALIDDATA;

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

  639.         break;

  640.     }

  641.     case AV_CODEC_ID_ADPCM_MS:

  642.         if (avctx->block_align > 0)

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

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

  645.         break;

  646.     case AV_CODEC_ID_ADPCM_MTAF:

  647.         if (avctx->block_align > 0)

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

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

  650.         break;

  651.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  652.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  653.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  654.     {

  655.         int samples_per_byte;

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

  657.         case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;

  658.         case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;

  659.         case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;

  660.         }

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

  662.             if (buf_size < ch)

  663.                 return AVERROR_INVALIDDATA;

  664.             nb_samples++;

  665.             buf_size -= ch;

  666.         }

  667.         nb_samples += buf_size * samples_per_byte / ch;

  668.         break;

  669.     }

  670.     case AV_CODEC_ID_ADPCM_SWF:

  671.     {

  672.         int buf_bits       = buf_size * 8 - 2;

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

  674.         int block_hdr_size = 22 * ch;

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

  676.         int nblocks        = buf_bits / block_size;

  677.         int bits_left      = buf_bits - nblocks * block_size;

  678.         nb_samples         = nblocks * 4096;

  679.         if (bits_left >= block_hdr_size)

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

  681.         break;

  682.     }

  683.     case AV_CODEC_ID_ADPCM_THP:

  684.     case AV_CODEC_ID_ADPCM_THP_LE:

  685.         if (avctx->extradata) {

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

  687.             break;

  688.         }

  689.         has_coded_samples = 1;

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

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

  692.                           bytestream2_get_le32(gb) :

  693.                           bytestream2_get_be32(gb);

  694.         buf_size       -= 8 + 36 * ch;

  695.         buf_size       /= ch;

  696.         nb_samples      = buf_size / 8 * 14;

  697.         if (buf_size % 8 > 1)

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

  699.         *approx_nb_samples = 1;

  700.         break;

  701.     case AV_CODEC_ID_ADPCM_AFC:

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

  703.         break;

  704.     case AV_CODEC_ID_ADPCM_XA:

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

  706.         break;

  707.     case AV_CODEC_ID_ADPCM_DTK:

  708.     case AV_CODEC_ID_ADPCM_PSX:

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

  710.         break;

  711.     }

  712. 

  713.     /* validate coded sample count */

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

  715.         return AVERROR_INVALIDDATA;

  716. 

  717.     return nb_samples;

  718. }

  719. 

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

  721.                               int *got_frame_ptr, AVPacket *avpkt)

  722. {

  723.     AVFrame *frame     = data;

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

  725.     int buf_size = avpkt->size;

  726.     ADPCMDecodeContext *c = avctx->priv_data;

  727.     ADPCMChannelStatus *cs;

  728.     int n, m, channel, i;

  729.     int16_t *samples;

  730.     int16_t **samples_p;

  731.     int st; /* stereo */

  732.     int count1, count2;

  733.     int nb_samples, coded_samples, approx_nb_samples, ret;

  734.     GetByteContext gb;

  735. 

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

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

  738.     if (nb_samples <= 0) {

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

  740.         return AVERROR_INVALIDDATA;

  741.     }

  742. 

  743.     /* get output buffer */

  744.     frame->nb_samples = nb_samples;

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

  746.         return ret;

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

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

  749. 

  750.     /* use coded_samples when applicable */

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

  752.     if (coded_samples) {

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

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

  755.         frame->nb_samples = nb_samples = coded_samples;

  756.     }

  757. 

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

  759. 

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

  761.     case AV_CODEC_ID_ADPCM_IMA_QT:

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

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

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

  765.             int predictor;

  766.             int step_index;

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

  768.             /* (pppppp) (piiiiiii) */

  769. 

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

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

  772.             step_index = predictor & 0x7F;

  773.             predictor &= ~0x7F;

  774. 

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

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

  777.                 if (diff < 0)

  778.                     diff = - diff;

  779.                 if (diff > 0x7f)

  780.                     goto update;

  781.             } else {

  782.             update:

  783.                 cs->step_index = step_index;

  784.                 cs->predictor = predictor;

  785.             }

  786. 

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

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

  789.                        channel, cs->step_index);

  790.                 return AVERROR_INVALIDDATA;

  791.             }

  792. 

  793.             samples = samples_p[channel];

  794. 

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

  796.                 int byte = bytestream2_get_byteu(&gb);

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

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

  799.             }

  800.         }

  801.         break;

  802.     case AV_CODEC_ID_ADPCM_IMA_WAV:

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

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

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

  806. 

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

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

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

  810.                        i, cs->step_index);

  811.                 return AVERROR_INVALIDDATA;

  812.             }

  813.         }

  814. 

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

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

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

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

  819.             GetBitContext g;

  820. 

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

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

  823.                     int j;

  824. 

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

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

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

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

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

  830.                     }

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

  832.                     if (ret < 0)

  833.                         return ret;

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

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

  836.                                           avctx->bits_per_coded_sample);

  837.                     }

  838.                 }

  839.             }

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

  841.         } else {

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

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

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

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

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

  847.                     int v = bytestream2_get_byteu(&gb);

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

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

  850.                 }

  851.             }

  852.         }

  853.         }

  854.         break;

  855.     case AV_CODEC_ID_ADPCM_4XM:

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

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

  858. 

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

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

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

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

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

  864.                 return AVERROR_INVALIDDATA;

  865.             }

  866.         }

  867. 

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

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

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

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

  872.                 int v = bytestream2_get_byteu(&gb);

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

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

  875.             }

  876.         }

  877.         break;

  878.     case AV_CODEC_ID_ADPCM_MS:

  879.     {

  880.         int block_predictor;

  881. 

  882.         block_predictor = bytestream2_get_byteu(&gb);

  883.         if (block_predictor > 6) {

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

  885.                    block_predictor);

  886.             return AVERROR_INVALIDDATA;

  887.         }

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

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

  890.         if (st) {

  891.             block_predictor = bytestream2_get_byteu(&gb);

  892.             if (block_predictor > 6) {

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

  894.                        block_predictor);

  895.                 return AVERROR_INVALIDDATA;

  896.             }

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

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

  899.         }

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

  901.         if (st){

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

  903.         }

  904. 

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

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

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

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

  909. 

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

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

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

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

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

  915.             int byte = bytestream2_get_byteu(&gb);

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

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

  918.         }

  919.         break;

  920.     }

  921.     case AV_CODEC_ID_ADPCM_MTAF:

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

  923.             bytestream2_skipu(&gb, 4);

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

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

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

  927.             bytestream2_skipu(&gb, 2);

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

  929.             bytestream2_skipu(&gb, 2);

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

  931.                 int v = bytestream2_get_byteu(&gb);

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

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

  934.             }

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

  936.                 int v = bytestream2_get_byteu(&gb);

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

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

  939.             }

  940.         }

  941.         break;

  942.     case AV_CODEC_ID_ADPCM_IMA_DK4:

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

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

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

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

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

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

  949.                        channel, cs->step_index);

  950.                 return AVERROR_INVALIDDATA;

  951.             }

  952.         }

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

  954.             int v = bytestream2_get_byteu(&gb);

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

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

  957.         }

  958.         break;

  959.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  960.     {

  961.         int last_byte = 0;

  962.         int nibble;

  963.         int decode_top_nibble_next = 0;

  964.         int diff_channel;

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

  966. 

  967.         bytestream2_skipu(&gb, 10);

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

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

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

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

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

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

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

  975.             return AVERROR_INVALIDDATA;

  976.         }

  977.         /* sign extend the predictors */

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

  979. 

  980.         /* DK3 ADPCM support macro */

  981. #define DK3_GET_NEXT_NIBBLE() \

  982.     if (decode_top_nibble_next) { \

  983.         nibble = last_byte >> 4; \

  984.         decode_top_nibble_next = 0; \

  985.     } else { \

  986.         last_byte = bytestream2_get_byteu(&gb); \

  987.         nibble = last_byte & 0x0F; \

  988.         decode_top_nibble_next = 1; \

  989.     }

  990. 

  991.         while (samples < samples_end) {

  992. 

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

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

  995. 

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

  997.             DK3_GET_NEXT_NIBBLE();

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

  999. 

  1000.             /* process the diff channel predictor */

  1001.             DK3_GET_NEXT_NIBBLE();

  1002.             adpcm_ima_expand_nibble(&c->status[1], nibble, 3);

  1003. 

  1004.             /* process the first pair of stereo PCM samples */

  1005.             diff_channel = (diff_channel + c->status[1].predictor) / 2;

  1006.             *samples++ = c->status[0].predictor + c->status[1].predictor;

  1007.             *samples++ = c->status[0].predictor - c->status[1].predictor;

  1008. 

  1009.             /* process the second predictor of the sum channel */

  1010.             DK3_GET_NEXT_NIBBLE();

  1011.             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

  1012. 

  1013.             /* process the second pair of stereo PCM samples */

  1014.             diff_channel = (diff_channel + c->status[1].predictor) / 2;

  1015.             *samples++ = c->status[0].predictor + c->status[1].predictor;

  1016.             *samples++ = c->status[0].predictor - c->status[1].predictor;

  1017.         }

  1018. 

  1019.         if ((bytestream2_tell(&gb) & 1))

  1020.             bytestream2_skip(&gb, 1);

  1021.         break;

  1022.     }

  1023.     case AV_CODEC_ID_ADPCM_IMA_ISS:

  1024.         for (channel = 0; channel < avctx->channels; channel++) {

  1025.             cs = &c->status[channel];

  1026.             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1027.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1028.             if (cs->step_index > 88u){

  1029.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1030.                        channel, cs->step_index);

  1031.                 return AVERROR_INVALIDDATA;

  1032.             }

  1033.         }

  1034. 

  1035.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1036.             int v1, v2;

  1037.             int v = bytestream2_get_byteu(&gb);

  1038.             /* nibbles are swapped for mono */

  1039.             if (st) {

  1040.                 v1 = v >> 4;

  1041.                 v2 = v & 0x0F;

  1042.             } else {

  1043.                 v2 = v >> 4;

  1044.                 v1 = v & 0x0F;

  1045.             }

  1046.             *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);

  1047.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);

  1048.         }

  1049.         break;

  1050.     case AV_CODEC_ID_ADPCM_IMA_DAT4:

  1051.         for (channel = 0; channel < avctx->channels; channel++) {

  1052.             cs = &c->status[channel];

  1053.             samples = samples_p[channel];

  1054.             bytestream2_skip(&gb, 4);

  1055.             for (n = 0; n < nb_samples; n += 2) {

  1056.                 int v = bytestream2_get_byteu(&gb);

  1057.                 *samples++ = adpcm_ima_expand_nibble(cs, v >> 4  , 3);

  1058.                 *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);

  1059.             }

  1060.         }

  1061.         break;

  1062.     case AV_CODEC_ID_ADPCM_IMA_APC:

  1063.         while (bytestream2_get_bytes_left(&gb) > 0) {

  1064.             int v = bytestream2_get_byteu(&gb);

  1065.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  v >> 4  , 3);

  1066.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

  1067.         }

  1068.         break;

  1069.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  1070.         while (bytestream2_get_bytes_left(&gb) > 0) {

  1071.             int v = bytestream2_get_byteu(&gb);

  1072.             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[0],  v >> 4  );

  1073.             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[st], v & 0x0F);

  1074.         }

  1075.         break;

  1076.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  1077.         for (channel = 0; channel < avctx->channels; channel++) {

  1078.             cs = &c->status[channel];

  1079.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1080.             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1081.             if (cs->step_index > 88u){

  1082.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1083.                        channel, cs->step_index);

  1084.                 return AVERROR_INVALIDDATA;

  1085.             }

  1086.         }

  1087.         for (n = 0; n < nb_samples / 2; n++) {

  1088.             int byte[2];

  1089. 

  1090.             byte[0] = bytestream2_get_byteu(&gb);

  1091.             if (st)

  1092.                 byte[1] = bytestream2_get_byteu(&gb);

  1093.             for(channel = 0; channel < avctx->channels; channel++) {

  1094.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] & 0x0F, 3);

  1095.             }

  1096.             for(channel = 0; channel < avctx->channels; channel++) {

  1097.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] >> 4  , 3);

  1098.             }

  1099.         }

  1100.         break;

  1101.     case AV_CODEC_ID_ADPCM_IMA_WS:

  1102.         if (c->vqa_version == 3) {

  1103.             for (channel = 0; channel < avctx->channels; channel++) {

  1104.                 int16_t *smp = samples_p[channel];

  1105. 

  1106.                 for (n = nb_samples / 2; n > 0; n--) {

  1107.                     int v = bytestream2_get_byteu(&gb);

  1108.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1109.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1110.                 }

  1111.             }

  1112.         } else {

  1113.             for (n = nb_samples / 2; n > 0; n--) {

  1114.                 for (channel = 0; channel < avctx->channels; channel++) {

  1115.                     int v = bytestream2_get_byteu(&gb);

  1116.                     *samples++  = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1117.                     samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1118.                 }

  1119.                 samples += avctx->channels;

  1120.             }

  1121.         }

  1122.         bytestream2_seek(&gb, 0, SEEK_END);

  1123.         break;

  1124.     case AV_CODEC_ID_ADPCM_XA:

  1125.     {

  1126.         int16_t *out0 = samples_p[0];

  1127.         int16_t *out1 = samples_p[1];

  1128.         int samples_per_block = 28 * (3 - avctx->channels) * 4;

  1129.         int sample_offset = 0;

  1130.         while (bytestream2_get_bytes_left(&gb) >= 128) {

  1131.             if ((ret = xa_decode(avctx, out0, out1, buf + bytestream2_tell(&gb),

  1132.                                  &c->status[0], &c->status[1],

  1133.                                  avctx->channels, sample_offset)) < 0)

  1134.                 return ret;

  1135.             bytestream2_skipu(&gb, 128);

  1136.             sample_offset += samples_per_block;

  1137.         }

  1138.         break;

  1139.     }

  1140.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  1141.         for (i=0; i<=st; i++) {

  1142.             c->status[i].step_index = bytestream2_get_le32u(&gb);

  1143.             if (c->status[i].step_index > 88u) {

  1144.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1145.                        i, c->status[i].step_index);

  1146.                 return AVERROR_INVALIDDATA;

  1147.             }

  1148.         }

  1149.         for (i=0; i<=st; i++) {

  1150.             c->status[i].predictor  = bytestream2_get_le32u(&gb);

  1151.             if (FFABS((int64_t)c->status[i].predictor) > (1<<16))

  1152.                 return AVERROR_INVALIDDATA;

  1153.         }

  1154. 

  1155.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1156.             int byte   = bytestream2_get_byteu(&gb);

  1157.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   3);

  1158.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);

  1159.         }

  1160.         break;

  1161.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  1162.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1163.             int byte = bytestream2_get_byteu(&gb);

  1164.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   6);

  1165.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);

  1166.         }

  1167.         break;

  1168.     case AV_CODEC_ID_ADPCM_EA:

  1169.     {

  1170.         int previous_left_sample, previous_right_sample;

  1171.         int current_left_sample, current_right_sample;

  1172.         int next_left_sample, next_right_sample;

  1173.         int coeff1l, coeff2l, coeff1r, coeff2r;

  1174.         int shift_left, shift_right;

  1175. 

  1176.         /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,

  1177.            each coding 28 stereo samples. */

  1178. 

  1179.         if(avctx->channels != 2)

  1180.             return AVERROR_INVALIDDATA;

  1181. 

  1182.         current_left_sample   = sign_extend(bytestream2_get_le16u(&gb), 16);

  1183.         previous_left_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1184.         current_right_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1185.         previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

  1186. 

  1187.         for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1188.             int byte = bytestream2_get_byteu(&gb);

  1189.             coeff1l = ea_adpcm_table[ byte >> 4       ];

  1190.             coeff2l = ea_adpcm_table[(byte >> 4  ) + 4];

  1191.             coeff1r = ea_adpcm_table[ byte & 0x0F];

  1192.             coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];

  1193. 

  1194.             byte = bytestream2_get_byteu(&gb);

  1195.             shift_left  = 20 - (byte >> 4);

  1196.             shift_right = 20 - (byte & 0x0F);

  1197. 

  1198.             for (count2 = 0; count2 < 28; count2++) {

  1199.                 byte = bytestream2_get_byteu(&gb);

  1200.                 next_left_sample  = sign_extend(byte >> 4, 4) << shift_left;

  1201.                 next_right_sample = sign_extend(byte,      4) << shift_right;

  1202. 

  1203.                 next_left_sample = (next_left_sample +

  1204.                     (current_left_sample * coeff1l) +

  1205.                     (previous_left_sample * coeff2l) + 0x80) >> 8;

  1206.                 next_right_sample = (next_right_sample +

  1207.                     (current_right_sample * coeff1r) +

  1208.                     (previous_right_sample * coeff2r) + 0x80) >> 8;

  1209. 

  1210.                 previous_left_sample = current_left_sample;

  1211.                 current_left_sample = av_clip_int16(next_left_sample);

  1212.                 previous_right_sample = current_right_sample;

  1213.                 current_right_sample = av_clip_int16(next_right_sample);

  1214.                 *samples++ = current_left_sample;

  1215.                 *samples++ = current_right_sample;

  1216.             }

  1217.         }

  1218. 

  1219.         bytestream2_skip(&gb, 2); // Skip terminating 0x0000

  1220. 

  1221.         break;

  1222.     }

  1223.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

  1224.     {

  1225.         int coeff[2][2], shift[2];

  1226. 

  1227.         for(channel = 0; channel < avctx->channels; channel++) {

  1228.             int byte = bytestream2_get_byteu(&gb);

  1229.             for (i=0; i<2; i++)

  1230.                 coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];

  1231.             shift[channel] = 20 - (byte & 0x0F);

  1232.         }

  1233.         for (count1 = 0; count1 < nb_samples / 2; count1++) {

  1234.             int byte[2];

  1235. 

  1236.             byte[0] = bytestream2_get_byteu(&gb);

  1237.             if (st) byte[1] = bytestream2_get_byteu(&gb);

  1238.             for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */

  1239.                 for(channel = 0; channel < avctx->channels; channel++) {

  1240.                     int sample = sign_extend(byte[channel] >> i, 4) << shift[channel];

  1241.                     sample = (sample +

  1242.                              c->status[channel].sample1 * coeff[channel][0] +

  1243.                              c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;

  1244.                     c->status[channel].sample2 = c->status[channel].sample1;

  1245.                     c->status[channel].sample1 = av_clip_int16(sample);

  1246.                     *samples++ = c->status[channel].sample1;

  1247.                 }

  1248.             }

  1249.         }

  1250.         bytestream2_seek(&gb, 0, SEEK_END);

  1251.         break;

  1252.     }

  1253.     case AV_CODEC_ID_ADPCM_EA_R1:

  1254.     case AV_CODEC_ID_ADPCM_EA_R2:

  1255.     case AV_CODEC_ID_ADPCM_EA_R3: {

  1256.         /* channel numbering

  1257.            2chan: 0=fl, 1=fr

  1258.            4chan: 0=fl, 1=rl, 2=fr, 3=rr

  1259.            6chan: 0=fl, 1=c,  2=fr, 3=rl,  4=rr, 5=sub */

  1260.         const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;

  1261.         int previous_sample, current_sample, next_sample;

  1262.         int coeff1, coeff2;

  1263.         int shift;

  1264.         unsigned int channel;

  1265.         uint16_t *samplesC;

  1266.         int count = 0;

  1267.         int offsets[6];

  1268. 

  1269.         for (channel=0; channel<avctx->channels; channel++)

  1270.             offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :

  1271.                                              bytestream2_get_le32(&gb)) +

  1272.                                (avctx->channels + 1) * 4;

  1273. 

  1274.         for (channel=0; channel<avctx->channels; channel++) {

  1275.             bytestream2_seek(&gb, offsets[channel], SEEK_SET);

  1276.             samplesC = samples_p[channel];

  1277. 

  1278.             if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {

  1279.                 current_sample  = sign_extend(bytestream2_get_le16(&gb), 16);

  1280.                 previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);

  1281.             } else {

  1282.                 current_sample  = c->status[channel].predictor;

  1283.                 previous_sample = c->status[channel].prev_sample;

  1284.             }

  1285. 

  1286.             for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1287.                 int byte = bytestream2_get_byte(&gb);

  1288.                 if (byte == 0xEE) {  /* only seen in R2 and R3 */

  1289.                     current_sample  = sign_extend(bytestream2_get_be16(&gb), 16);

  1290.                     previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);

  1291. 

  1292.                     for (count2=0; count2<28; count2++)

  1293.                         *samplesC++ = sign_extend(bytestream2_get_be16(&gb), 16);

  1294.                 } else {

  1295.                     coeff1 = ea_adpcm_table[ byte >> 4     ];

  1296.                     coeff2 = ea_adpcm_table[(byte >> 4) + 4];

  1297.                     shift = 20 - (byte & 0x0F);

  1298. 

  1299.                     for (count2=0; count2<28; count2++) {

  1300.                         if (count2 & 1)

  1301.                             next_sample = (unsigned)sign_extend(byte,    4) << shift;

  1302.                         else {

  1303.                             byte = bytestream2_get_byte(&gb);

  1304.                             next_sample = (unsigned)sign_extend(byte >> 4, 4) << shift;

  1305.                         }

  1306. 

  1307.                         next_sample += (current_sample  * coeff1) +

  1308.                                        (previous_sample * coeff2);

  1309.                         next_sample = av_clip_int16(next_sample >> 8);

  1310. 

  1311.                         previous_sample = current_sample;

  1312.                         current_sample  = next_sample;

  1313.                         *samplesC++ = current_sample;

  1314.                     }

  1315.                 }

  1316.             }

  1317.             if (!count) {

  1318.                 count = count1;

  1319.             } else if (count != count1) {

  1320.                 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");

  1321.                 count = FFMAX(count, count1);

  1322.             }

  1323. 

  1324.             if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {

  1325.                 c->status[channel].predictor   = current_sample;

  1326.                 c->status[channel].prev_sample = previous_sample;

  1327.             }

  1328.         }

  1329. 

  1330.         frame->nb_samples = count * 28;

  1331.         bytestream2_seek(&gb, 0, SEEK_END);

  1332.         break;

  1333.     }

  1334.     case AV_CODEC_ID_ADPCM_EA_XAS:

  1335.         for (channel=0; channel<avctx->channels; channel++) {

  1336.             int coeff[2][4], shift[4];

  1337.             int16_t *s = samples_p[channel];

  1338.             for (n = 0; n < 4; n++, s += 32) {

  1339.                 int val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1340.                 for (i=0; i<2; i++)

  1341.                     coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];

  1342.                 s[0] = val & ~0x0F;

  1343. 

  1344.                 val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1345.                 shift[n] = 20 - (val & 0x0F);

  1346.                 s[1] = val & ~0x0F;

  1347.             }

  1348. 

  1349.             for (m=2; m<32; m+=2) {

  1350.                 s = &samples_p[channel][m];

  1351.                 for (n = 0; n < 4; n++, s += 32) {

  1352.                     int level, pred;

  1353.                     int byte = bytestream2_get_byteu(&gb);

  1354. 

  1355.                     level = sign_extend(byte >> 4, 4) << shift[n];

  1356.                     pred  = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];

  1357.                     s[0]  = av_clip_int16((level + pred + 0x80) >> 8);

  1358. 

  1359.                     level = sign_extend(byte, 4) << shift[n];

  1360.                     pred  = s[0] * coeff[0][n] + s[-1] * coeff[1][n];

  1361.                     s[1]  = av_clip_int16((level + pred + 0x80) >> 8);

  1362.                 }

  1363.             }

  1364.         }

  1365.         break;

  1366.     case AV_CODEC_ID_ADPCM_IMA_AMV:

  1367.         c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  1368.         c->status[0].step_index = bytestream2_get_byteu(&gb);

  1369.         bytestream2_skipu(&gb, 5);

  1370.         if (c->status[0].step_index > 88u) {

  1371.             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1372.                    c->status[0].step_index);

  1373.             return AVERROR_INVALIDDATA;

  1374.         }

  1375. 

  1376.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1377.             int v = bytestream2_get_byteu(&gb);

  1378. 

  1379.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);

  1380.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);

  1381.         }

  1382.         break;

  1383.     case AV_CODEC_ID_ADPCM_IMA_SMJPEG:

  1384.         for (i = 0; i < avctx->channels; i++) {

  1385.             c->status[i].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);

  1386.             c->status[i].step_index = bytestream2_get_byteu(&gb);

  1387.             bytestream2_skipu(&gb, 1);

  1388.             if (c->status[i].step_index > 88u) {

  1389.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1390.                        c->status[i].step_index);

  1391.                 return AVERROR_INVALIDDATA;

  1392.             }

  1393.         }

  1394. 

  1395.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1396.             int v = bytestream2_get_byteu(&gb);

  1397. 

  1398.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[0 ], v >> 4, 3);

  1399.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0xf, 3);

  1400.         }

  1401.         break;

  1402.     case AV_CODEC_ID_ADPCM_CT:

  1403.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1404.             int v = bytestream2_get_byteu(&gb);

  1405.             *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4  );

  1406.             *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);

  1407.         }

  1408.         break;

  1409.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  1410.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  1411.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  1412.         if (!c->status[0].step_index) {

  1413.             /* the first byte is a raw sample */

  1414.             *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1415.             if (st)

  1416.                 *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1417.             c->status[0].step_index = 1;

  1418.             nb_samples--;

  1419.         }

  1420.         if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {

  1421.             for (n = nb_samples >> (1 - st); n > 0; n--) {

  1422.                 int byte = bytestream2_get_byteu(&gb);

  1423.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1424.                                                        byte >> 4,   4, 0);

  1425.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1426.                                                        byte & 0x0F, 4, 0);

  1427.             }

  1428.         } else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {

  1429.             for (n = (nb_samples<<st) / 3; n > 0; n--) {

  1430.                 int byte = bytestream2_get_byteu(&gb);

  1431.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1432.                                                         byte >> 5        , 3, 0);

  1433.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1434.                                                        (byte >> 2) & 0x07, 3, 0);

  1435.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1436.                                                         byte & 0x03,       2, 0);

  1437.             }

  1438.         } else {

  1439.             for (n = nb_samples >> (2 - st); n > 0; n--) {

  1440.                 int byte = bytestream2_get_byteu(&gb);

  1441.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1442.                                                         byte >> 6        , 2, 2);

  1443.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1444.                                                        (byte >> 4) & 0x03, 2, 2);

  1445.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1446.                                                        (byte >> 2) & 0x03, 2, 2);

  1447.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1448.                                                         byte & 0x03,       2, 2);

  1449.             }

  1450.         }

  1451.         break;

  1452.     case AV_CODEC_ID_ADPCM_SWF:

  1453.         adpcm_swf_decode(avctx, buf, buf_size, samples);

  1454.         bytestream2_seek(&gb, 0, SEEK_END);

  1455.         break;

  1456.     case AV_CODEC_ID_ADPCM_YAMAHA:

  1457.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1458.             int v = bytestream2_get_byteu(&gb);

  1459.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);

  1460.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4  );

  1461.         }

  1462.         break;

  1463.     case AV_CODEC_ID_ADPCM_AICA:

  1464.         if (!c->has_status) {

  1465.             for (channel = 0; channel < avctx->channels; channel++)

  1466.                 c->status[channel].step = 0;

  1467.             c->has_status = 1;

  1468.         }

  1469.         for (channel = 0; channel < avctx->channels; channel++) {

  1470.             samples = samples_p[channel];

  1471.             for (n = nb_samples >> 1; n > 0; n--) {

  1472.                 int v = bytestream2_get_byteu(&gb);

  1473.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v & 0x0F);

  1474.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v >> 4  );

  1475.             }

  1476.         }

  1477.         break;

  1478.     case AV_CODEC_ID_ADPCM_AFC:

  1479.     {

  1480.         int samples_per_block;

  1481.         int blocks;

  1482. 

  1483.         if (avctx->extradata && avctx->extradata_size == 1 && avctx->extradata[0]) {

  1484.             samples_per_block = avctx->extradata[0] / 16;

  1485.             blocks = nb_samples / avctx->extradata[0];

  1486.         } else {

  1487.             samples_per_block = nb_samples / 16;

  1488.             blocks = 1;

  1489.         }

  1490. 

  1491.         for (m = 0; m < blocks; m++) {

  1492.         for (channel = 0; channel < avctx->channels; channel++) {

  1493.             int prev1 = c->status[channel].sample1;

  1494.             int prev2 = c->status[channel].sample2;

  1495. 

  1496.             samples = samples_p[channel] + m * 16;

  1497.             /* Read in every sample for this channel.  */

  1498.             for (i = 0; i < samples_per_block; i++) {

  1499.                 int byte = bytestream2_get_byteu(&gb);

  1500.                 int scale = 1 << (byte >> 4);

  1501.                 int index = byte & 0xf;

  1502.                 int factor1 = ff_adpcm_afc_coeffs[0][index];

  1503.                 int factor2 = ff_adpcm_afc_coeffs[1][index];

  1504. 

  1505.                 /* Decode 16 samples.  */

  1506.                 for (n = 0; n < 16; n++) {

  1507.                     int32_t sampledat;

  1508. 

  1509.                     if (n & 1) {

  1510.                         sampledat = sign_extend(byte, 4);

  1511.                     } else {

  1512.                         byte = bytestream2_get_byteu(&gb);

  1513.                         sampledat = sign_extend(byte >> 4, 4);

  1514.                     }

  1515. 

  1516.                     sampledat = ((prev1 * factor1 + prev2 * factor2) +

  1517.                                  ((sampledat * scale) << 11)) >> 11;

  1518.                     *samples = av_clip_int16(sampledat);

  1519.                     prev2 = prev1;

  1520.                     prev1 = *samples++;

  1521.                 }

  1522.             }

  1523. 

  1524.             c->status[channel].sample1 = prev1;

  1525.             c->status[channel].sample2 = prev2;

  1526.         }

  1527.         }

  1528.         bytestream2_seek(&gb, 0, SEEK_END);

  1529.         break;

  1530.     }

  1531.     case AV_CODEC_ID_ADPCM_THP:

  1532.     case AV_CODEC_ID_ADPCM_THP_LE:

  1533.     {

  1534.         int table[14][16];

  1535.         int ch;

  1536. 

  1537. #define THP_GET16(g) \

  1538.     sign_extend( \

  1539.         avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE ? \

  1540.         bytestream2_get_le16u(&(g)) : \

  1541.         bytestream2_get_be16u(&(g)), 16)

  1542. 

  1543.         if (avctx->extradata) {

  1544.             GetByteContext tb;

  1545.             if (avctx->extradata_size < 32 * avctx->channels) {

  1546.                 av_log(avctx, AV_LOG_ERROR, "Missing coeff table\n");

  1547.                 return AVERROR_INVALIDDATA;

  1548.             }

  1549. 

  1550.             bytestream2_init(&tb, avctx->extradata, avctx->extradata_size);

  1551.             for (i = 0; i < avctx->channels; i++)

  1552.                 for (n = 0; n < 16; n++)

  1553.                     table[i][n] = THP_GET16(tb);

  1554.         } else {

  1555.             for (i = 0; i < avctx->channels; i++)

  1556.                 for (n = 0; n < 16; n++)

  1557.                     table[i][n] = THP_GET16(gb);

  1558. 

  1559.             if (!c->has_status) {

  1560.                 /* Initialize the previous sample.  */

  1561.                 for (i = 0; i < avctx->channels; i++) {

  1562.                     c->status[i].sample1 = THP_GET16(gb);

  1563.                     c->status[i].sample2 = THP_GET16(gb);

  1564.                 }

  1565.                 c->has_status = 1;

  1566.             } else {

  1567.                 bytestream2_skip(&gb, avctx->channels * 4);

  1568.             }

  1569.         }

  1570. 

  1571.         for (ch = 0; ch < avctx->channels; ch++) {

  1572.             samples = samples_p[ch];

  1573. 

  1574.             /* Read in every sample for this channel.  */

  1575.             for (i = 0; i < (nb_samples + 13) / 14; i++) {

  1576.                 int byte = bytestream2_get_byteu(&gb);

  1577.                 int index = (byte >> 4) & 7;

  1578.                 unsigned int exp = byte & 0x0F;

  1579.                 int64_t factor1 = table[ch][index * 2];

  1580.                 int64_t factor2 = table[ch][index * 2 + 1];

  1581. 

  1582.                 /* Decode 14 samples.  */

  1583.                 for (n = 0; n < 14 && (i * 14 + n < nb_samples); n++) {

  1584.                     int32_t sampledat;

  1585. 

  1586.                     if (n & 1) {

  1587.                         sampledat = sign_extend(byte, 4);

  1588.                     } else {

  1589.                         byte = bytestream2_get_byteu(&gb);

  1590.                         sampledat = sign_extend(byte >> 4, 4);

  1591.                     }

  1592. 

  1593.                     sampledat = ((c->status[ch].sample1 * factor1

  1594.                                 + c->status[ch].sample2 * factor2) >> 11) + (sampledat << exp);

  1595.                     *samples = av_clip_int16(sampledat);

  1596.                     c->status[ch].sample2 = c->status[ch].sample1;

  1597.                     c->status[ch].sample1 = *samples++;

  1598.                 }

  1599.             }

  1600.         }

  1601.         break;

  1602.     }

  1603.     case AV_CODEC_ID_ADPCM_DTK:

  1604.         for (channel = 0; channel < avctx->channels; channel++) {

  1605.             samples = samples_p[channel];

  1606. 

  1607.             /* Read in every sample for this channel.  */

  1608.             for (i = 0; i < nb_samples / 28; i++) {

  1609.                 int byte, header;

  1610.                 if (channel)

  1611.                     bytestream2_skipu(&gb, 1);

  1612.                 header = bytestream2_get_byteu(&gb);

  1613.                 bytestream2_skipu(&gb, 3 - channel);

  1614. 

  1615.                 /* Decode 28 samples.  */

  1616.                 for (n = 0; n < 28; n++) {

  1617.                     int32_t sampledat, prev;

  1618. 

  1619.                     switch (header >> 4) {

  1620.                     case 1:

  1621.                         prev = (c->status[channel].sample1 * 0x3c);

  1622.                         break;

  1623.                     case 2:

  1624.                         prev = (c->status[channel].sample1 * 0x73) - (c->status[channel].sample2 * 0x34);

  1625.                         break;

  1626.                     case 3:

  1627.                         prev = (c->status[channel].sample1 * 0x62) - (c->status[channel].sample2 * 0x37);

  1628.                         break;

  1629.                     default:

  1630.                         prev = 0;

  1631.                     }

  1632. 

  1633.                     prev = av_clip_intp2((prev + 0x20) >> 6, 21);

  1634. 

  1635.                     byte = bytestream2_get_byteu(&gb);

  1636.                     if (!channel)

  1637.                         sampledat = sign_extend(byte, 4);

  1638.                     else

  1639.                         sampledat = sign_extend(byte >> 4, 4);

  1640. 

  1641.                     sampledat = ((sampledat * (1 << 12)) >> (header & 0xf)) * (1 << 6) + prev;

  1642.                     *samples++ = av_clip_int16(sampledat >> 6);

  1643.                     c->status[channel].sample2 = c->status[channel].sample1;

  1644.                     c->status[channel].sample1 = sampledat;

  1645.                 }

  1646.             }

  1647.             if (!channel)

  1648.                 bytestream2_seek(&gb, 0, SEEK_SET);

  1649.         }

  1650.         break;

  1651.     case AV_CODEC_ID_ADPCM_PSX:

  1652.         for (channel = 0; channel < avctx->channels; channel++) {

  1653.             samples = samples_p[channel];

  1654. 

  1655.             /* Read in every sample for this channel.  */

  1656.             for (i = 0; i < nb_samples / 28; i++) {

  1657.                 int filter, shift, flag, byte;

  1658. 

  1659.                 filter = bytestream2_get_byteu(&gb);

  1660.                 shift  = filter & 0xf;

  1661.                 filter = filter >> 4;

  1662.                 if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table))

  1663.                     return AVERROR_INVALIDDATA;

  1664.                 flag   = bytestream2_get_byteu(&gb);

  1665. 

  1666.                 /* Decode 28 samples.  */

  1667.                 for (n = 0; n < 28; n++) {

  1668.                     int sample = 0, scale;

  1669. 

  1670.                     if (flag < 0x07) {

  1671.                         if (n & 1) {

  1672.                             scale = sign_extend(byte >> 4, 4);

  1673.                         } else {

  1674.                             byte  = bytestream2_get_byteu(&gb);

  1675.                             scale = sign_extend(byte, 4);

  1676.                         }

  1677. 

  1678.                         scale  = scale * (1 << 12);

  1679.                         sample = (int)((scale >> shift) + (c->status[channel].sample1 * xa_adpcm_table[filter][0] + c->status[channel].sample2 * xa_adpcm_table[filter][1]) / 64);

  1680.                     }

  1681.                     *samples++ = av_clip_int16(sample);

  1682.                     c->status[channel].sample2 = c->status[channel].sample1;

  1683.                     c->status[channel].sample1 = sample;

  1684.                 }

  1685.             }

  1686.         }

  1687.         break;

  1688. 

  1689.     default:

  1690.         return -1;

  1691.     }

  1692. 

  1693.     if (avpkt->size && bytestream2_tell(&gb) == 0) {

  1694.         av_log(avctx, AV_LOG_ERROR, "Nothing consumed\n");

  1695.         return AVERROR_INVALIDDATA;

  1696.     }

  1697. 

  1698.     *got_frame_ptr = 1;

  1699. 

  1700.     if (avpkt->size < bytestream2_tell(&gb)) {

  1701.         av_log(avctx, AV_LOG_ERROR, "Overread of %d < %d\n", avpkt->size, bytestream2_tell(&gb));

  1702.         return avpkt->size;

  1703.     }

  1704. 

  1705.     return bytestream2_tell(&gb);

  1706. }

  1707. 

  1708. static void adpcm_flush(AVCodecContext *avctx)

  1709. {

  1710.     ADPCMDecodeContext *c = avctx->priv_data;

  1711.     c->has_status = 0;

  1712. }

  1713. 

  1714. 

  1715. static const enum AVSampleFormat sample_fmts_s16[]  = { AV_SAMPLE_FMT_S16,

  1716.                                                         AV_SAMPLE_FMT_NONE };

  1717. static const enum AVSampleFormat sample_fmts_s16p[] = { AV_SAMPLE_FMT_S16P,

  1718.                                                         AV_SAMPLE_FMT_NONE };

  1719. static const enum AVSampleFormat sample_fmts_both[] = { AV_SAMPLE_FMT_S16,

  1720.                                                         AV_SAMPLE_FMT_S16P,

  1721.                                                         AV_SAMPLE_FMT_NONE };

  1722. 

  1723. #define ADPCM_DECODER(id_, sample_fmts_, name_, long_name_) \

  1724. AVCodec ff_ ## name_ ## _decoder = {                        \

  1725.     .name           = #name_,                               \

  1726.     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \

  1727.     .type           = AVMEDIA_TYPE_AUDIO,                   \

  1728.     .id             = id_,                                  \

  1729.     .priv_data_size = sizeof(ADPCMDecodeContext),           \

  1730.     .init           = adpcm_decode_init,                    \

  1731.     .decode         = adpcm_decode_frame,                   \

  1732.     .flush          = adpcm_flush,                          \

  1733.     .capabilities   = AV_CODEC_CAP_DR1,                     \

  1734.     .sample_fmts    = sample_fmts_,                         \

  1735. }

  1736. 

  1737. /* Note: Do not forget to add new entries to the Makefile as well. */

  1738. ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM,         sample_fmts_s16p, adpcm_4xm,         "ADPCM 4X Movie");

  1739. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AFC,         sample_fmts_s16p, adpcm_afc,         "ADPCM Nintendo Gamecube AFC");

  1740. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AICA,        sample_fmts_s16p, adpcm_aica,        "ADPCM Yamaha AICA");

  1741. ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT,          sample_fmts_s16,  adpcm_ct,          "ADPCM Creative Technology");

  1742. ADPCM_DECODER(AV_CODEC_ID_ADPCM_DTK,         sample_fmts_s16p, adpcm_dtk,         "ADPCM Nintendo Gamecube DTK");

  1743. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA,          sample_fmts_s16,  adpcm_ea,          "ADPCM Electronic Arts");

  1744. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, sample_fmts_s16,  adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");

  1745. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1,       sample_fmts_s16p, adpcm_ea_r1,       "ADPCM Electronic Arts R1");

  1746. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2,       sample_fmts_s16p, adpcm_ea_r2,       "ADPCM Electronic Arts R2");

  1747. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3,       sample_fmts_s16p, adpcm_ea_r3,       "ADPCM Electronic Arts R3");

  1748. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS,      sample_fmts_s16p, adpcm_ea_xas,      "ADPCM Electronic Arts XAS");

  1749. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV,     sample_fmts_s16,  adpcm_ima_amv,     "ADPCM IMA AMV");

  1750. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC,     sample_fmts_s16,  adpcm_ima_apc,     "ADPCM IMA CRYO APC");

  1751. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DAT4,    sample_fmts_s16,  adpcm_ima_dat4,    "ADPCM IMA Eurocom DAT4");

  1752. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3,     sample_fmts_s16,  adpcm_ima_dk3,     "ADPCM IMA Duck DK3");

  1753. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4,     sample_fmts_s16,  adpcm_ima_dk4,     "ADPCM IMA Duck DK4");

  1754. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, sample_fmts_s16,  adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");

  1755. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, sample_fmts_s16,  adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");

  1756. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS,     sample_fmts_s16,  adpcm_ima_iss,     "ADPCM IMA Funcom ISS");

  1757. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI,     sample_fmts_s16,  adpcm_ima_oki,     "ADPCM IMA Dialogic OKI");

  1758. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT,      sample_fmts_s16p, adpcm_ima_qt,      "ADPCM IMA QuickTime");

  1759. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_RAD,     sample_fmts_s16,  adpcm_ima_rad,     "ADPCM IMA Radical");

  1760. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG,  sample_fmts_s16,  adpcm_ima_smjpeg,  "ADPCM IMA Loki SDL MJPEG");

  1761. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV,     sample_fmts_s16p, adpcm_ima_wav,     "ADPCM IMA WAV");

  1762. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS,      sample_fmts_both, adpcm_ima_ws,      "ADPCM IMA Westwood");

  1763. ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS,          sample_fmts_s16,  adpcm_ms,          "ADPCM Microsoft");

  1764. ADPCM_DECODER(AV_CODEC_ID_ADPCM_MTAF,        sample_fmts_s16p, adpcm_mtaf,        "ADPCM MTAF");

  1765. ADPCM_DECODER(AV_CODEC_ID_ADPCM_PSX,         sample_fmts_s16p, adpcm_psx,         "ADPCM Playstation");

  1766. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2,     sample_fmts_s16,  adpcm_sbpro_2,     "ADPCM Sound Blaster Pro 2-bit");

  1767. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3,     sample_fmts_s16,  adpcm_sbpro_3,     "ADPCM Sound Blaster Pro 2.6-bit");

  1768. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4,     sample_fmts_s16,  adpcm_sbpro_4,     "ADPCM Sound Blaster Pro 4-bit");

  1769. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF,         sample_fmts_s16,  adpcm_swf,         "ADPCM Shockwave Flash");

  1770. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP_LE,      sample_fmts_s16p, adpcm_thp_le,      "ADPCM Nintendo THP (little-endian)");

  1771. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP,         sample_fmts_s16p, adpcm_thp,         "ADPCM Nintendo THP");

  1772. ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA,          sample_fmts_s16p, adpcm_xa,          "ADPCM CDROM XA");

  1773. ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA,      sample_fmts_s16,  adpcm_yamaha,      "ADPCM Yamaha");