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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 int8_t 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 int16_t 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 int8_t 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.     case AV_CODEC_ID_ADPCM_MS:

  109.         max_channels = 6;

  110.         break;

  111.     case AV_CODEC_ID_ADPCM_MTAF:

  112.         min_channels = 2;

  113.         max_channels = 8;

  114.         break;

  115.     case AV_CODEC_ID_ADPCM_PSX:

  116.         max_channels = 8;

  117.         break;

  118.     case AV_CODEC_ID_ADPCM_IMA_DAT4:

  119.     case AV_CODEC_ID_ADPCM_THP:

  120.     case AV_CODEC_ID_ADPCM_THP_LE:

  121.         max_channels = 14;

  122.         break;

  123.     }

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

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

  126.         return AVERROR(EINVAL);

  127.     }

  128. 

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

  130.     case AV_CODEC_ID_ADPCM_CT:

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

  132.         break;

  133.     case AV_CODEC_ID_ADPCM_IMA_WAV:

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

  135.             return AVERROR_INVALIDDATA;

  136.         break;

  137.     case AV_CODEC_ID_ADPCM_IMA_APC:

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

  139.             c->status[0].predictor = AV_RL32(avctx->extradata);

  140.             c->status[1].predictor = AV_RL32(avctx->extradata + 4);

  141.         }

  142.         break;

  143.     case AV_CODEC_ID_ADPCM_IMA_WS:

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

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

  146.         break;

  147.     default:

  148.         break;

  149.     }

  150. 

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

  152.         case AV_CODEC_ID_ADPCM_AICA:

  153.         case AV_CODEC_ID_ADPCM_IMA_DAT4:

  154.         case AV_CODEC_ID_ADPCM_IMA_QT:

  155.         case AV_CODEC_ID_ADPCM_IMA_WAV:

  156.         case AV_CODEC_ID_ADPCM_4XM:

  157.         case AV_CODEC_ID_ADPCM_XA:

  158.         case AV_CODEC_ID_ADPCM_EA_R1:

  159.         case AV_CODEC_ID_ADPCM_EA_R2:

  160.         case AV_CODEC_ID_ADPCM_EA_R3:

  161.         case AV_CODEC_ID_ADPCM_EA_XAS:

  162.         case AV_CODEC_ID_ADPCM_THP:

  163.         case AV_CODEC_ID_ADPCM_THP_LE:

  164.         case AV_CODEC_ID_ADPCM_AFC:

  165.         case AV_CODEC_ID_ADPCM_DTK:

  166.         case AV_CODEC_ID_ADPCM_PSX:

  167.         case AV_CODEC_ID_ADPCM_MTAF:

  168.             avctx->sample_fmt = AV_SAMPLE_FMT_S16P;

  169.             break;

  170.         case AV_CODEC_ID_ADPCM_IMA_WS:

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

  172.                                                       AV_SAMPLE_FMT_S16;

  173.             break;

  174.         case AV_CODEC_ID_ADPCM_MS:

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

  176.                                                       AV_SAMPLE_FMT_S16;

  177.             break;

  178.         default:

  179.             avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  180.     }

  181. 

  182.     return 0;

  183. }

  184. 

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

  186. {

  187.     int delta, pred, step, add;

  188. 

  189.     pred = c->predictor;

  190.     delta = nibble & 7;

  191.     step = c->step;

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

  193.     if (add < 0)

  194.         add = add + 7;

  195. 

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

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

  198.     else

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

  200. 

  201.     switch (delta) {

  202.     case 7:

  203.         step *= 0x99;

  204.         break;

  205.     case 6:

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

  207.         c->predictor = pred;

  208.         return pred;

  209.     case 5:

  210.         step *= 0x66;

  211.         break;

  212.     case 4:

  213.         step *= 0x4d;

  214.         break;

  215.     default:

  216.         step *= 0x39;

  217.         break;

  218.     }

  219. 

  220.     if (step < 0)

  221.         step += 0x3f;

  222. 

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

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

  225.     c->predictor = pred;

  226.     return pred;

  227. }

  228. 

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

  230. {

  231.     int step_index;

  232.     int predictor;

  233.     int sign, delta, diff, step;

  234. 

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

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

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

  238. 

  239.     sign = nibble & 8;

  240.     delta = nibble & 7;

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

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

  243.      * quickly enough */

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

  245.     predictor = c->predictor;

  246.     if (sign) predictor -= diff;

  247.     else predictor += diff;

  248. 

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

  250.     c->step_index = step_index;

  251. 

  252.     return (int16_t)c->predictor;

  253. }

  254. 

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

  256. {

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

  258. 

  259.     shift = bps - 1;

  260.     nibble = get_bits_le(gb, bps),

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

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

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

  264. 

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

  266.     delta = av_mod_uintp2(nibble, shift);

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

  268.     predictor = c->predictor;

  269.     if (sign) predictor -= diff;

  270.     else predictor += diff;

  271. 

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

  273.     c->step_index = step_index;

  274. 

  275.     return (int16_t)c->predictor;

  276. }

  277. 

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

  279. {

  280.     int step_index;

  281.     int predictor;

  282.     int diff, step;

  283. 

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

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

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

  287. 

  288.     diff = step >> 3;

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

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

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

  292. 

  293.     if (nibble & 8)

  294.         predictor = c->predictor - diff;

  295.     else

  296.         predictor = c->predictor + diff;

  297. 

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

  299.     c->step_index = step_index;

  300. 

  301.     return c->predictor;

  302. }

  303. 

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

  305. {

  306.     int predictor;

  307. 

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

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

  310. 

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

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

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

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

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

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

  317.         c->idelta = INT_MAX/768;

  318.     }

  319. 

  320.     return c->sample1;

  321. }

  322. 

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

  324. {

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

  326. 

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

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

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

  330. 

  331.     sign = nibble & 8;

  332.     delta = nibble & 7;

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

  334.     predictor = c->predictor;

  335.     if (sign) predictor -= diff;

  336.     else predictor += diff;

  337. 

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

  339.     c->step_index = step_index;

  340. 

  341.     return c->predictor << 4;

  342. }

  343. 

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

  345. {

  346.     int sign, delta, diff;

  347.     int new_step;

  348. 

  349.     sign = nibble & 8;

  350.     delta = nibble & 7;

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

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

  353.      * quickly enough */

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

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

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

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

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

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

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

  361. 

  362.     return (int16_t)c->predictor;

  363. }

  364. 

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

  366. {

  367.     int sign, delta, diff;

  368. 

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

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

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

  372. 

  373.     /* clamp result */

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

  375. 

  376.     /* calculate new step */

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

  378.         c->step++;

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

  380.         c->step--;

  381. 

  382.     return (int16_t) c->predictor;

  383. }

  384. 

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

  386. {

  387.     if(!c->step) {

  388.         c->predictor = 0;

  389.         c->step = 127;

  390.     }

  391. 

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

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

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

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

  396.     return c->predictor;

  397. }

  398. 

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

  400. {

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

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

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

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

  405.     return c->predictor;

  406. }

  407. 

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

  409.                      const uint8_t *in, ADPCMChannelStatus *left,

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

  411. {

  412.     int i, j;

  413.     int shift,filter,f0,f1;

  414.     int s_1,s_2;

  415.     int d,s,t;

  416. 

  417.     out0 += sample_offset;

  418.     if (channels == 1)

  419.         out1 = out0 + 28;

  420.     else

  421.         out1 += sample_offset;

  422. 

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

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

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

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

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

  428.             filter=0;

  429.         }

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

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

  432. 

  433.         s_1 = left->sample1;

  434.         s_2 = left->sample2;

  435. 

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

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

  438. 

  439.             t = sign_extend(d, 4);

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

  441.             s_2 = s_1;

  442.             s_1 = av_clip_int16(s);

  443.             out0[j] = s_1;

  444.         }

  445. 

  446.         if (channels == 2) {

  447.             left->sample1 = s_1;

  448.             left->sample2 = s_2;

  449.             s_1 = right->sample1;

  450.             s_2 = right->sample2;

  451.         }

  452. 

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

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

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

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

  457.             filter=0;

  458.         }

  459. 

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

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

  462. 

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

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

  465. 

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

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

  468.             s_2 = s_1;

  469.             s_1 = av_clip_int16(s);

  470.             out1[j] = s_1;

  471.         }

  472. 

  473.         if (channels == 2) {

  474.             right->sample1 = s_1;

  475.             right->sample2 = s_2;

  476.         } else {

  477.             left->sample1 = s_1;

  478.             left->sample2 = s_2;

  479.         }

  480. 

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

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

  483.     }

  484. 

  485.     return 0;

  486. }

  487. 

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

  489. {

  490.     ADPCMDecodeContext *c = avctx->priv_data;

  491.     GetBitContext gb;

  492.     const int8_t *table;

  493.     int k0, signmask, nb_bits, count;

  494.     int size = buf_size*8;

  495.     int i;

  496. 

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

  498. 

  499.     //read bits & initial values

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

  501.     table = swf_index_tables[nb_bits-2];

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

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

  504. 

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

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

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

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

  509.         }

  510. 

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

  512.             int i;

  513. 

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

  515.                 // similar to IMA adpcm

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

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

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

  519.                 int k = k0;

  520. 

  521.                 do {

  522.                     if (delta & k)

  523.                         vpdiff += step;

  524.                     step >>= 1;

  525.                     k >>= 1;

  526.                 } while(k);

  527.                 vpdiff += step;

  528. 

  529.                 if (delta & signmask)

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

  531.                 else

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

  533. 

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

  535. 

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

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

  538. 

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

  540.             }

  541.         }

  542.     }

  543. }

  544. 

  545. /**

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

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

  548.  * decode with the given buf_size.

  549.  *

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

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

  552.  *                           number of samples in each frame.

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

  554.  *                               returned is an approximation.

  555.  */

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

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

  558. {

  559.     ADPCMDecodeContext *s = avctx->priv_data;

  560.     int nb_samples        = 0;

  561.     int ch                = avctx->channels;

  562.     int has_coded_samples = 0;

  563.     int header_size;

  564. 

  565.     *coded_samples = 0;

  566.     *approx_nb_samples = 0;

  567. 

  568.     if(ch <= 0)

  569.         return 0;

  570. 

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

  572.     /* constant, only check buf_size */

  573.     case AV_CODEC_ID_ADPCM_EA_XAS:

  574.         if (buf_size < 76 * ch)

  575.             return 0;

  576.         nb_samples = 128;

  577.         break;

  578.     case AV_CODEC_ID_ADPCM_IMA_QT:

  579.         if (buf_size < 34 * ch)

  580.             return 0;

  581.         nb_samples = 64;

  582.         break;

  583.     /* simple 4-bit adpcm */

  584.     case AV_CODEC_ID_ADPCM_CT:

  585.     case AV_CODEC_ID_ADPCM_IMA_APC:

  586.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  587.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  588.     case AV_CODEC_ID_ADPCM_IMA_WS:

  589.     case AV_CODEC_ID_ADPCM_YAMAHA:

  590.     case AV_CODEC_ID_ADPCM_AICA:

  591.         nb_samples = buf_size * 2 / ch;

  592.         break;

  593.     }

  594.     if (nb_samples)

  595.         return nb_samples;

  596. 

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

  598.     header_size = 0;

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

  600.         case AV_CODEC_ID_ADPCM_4XM:

  601.         case AV_CODEC_ID_ADPCM_AGM:

  602.         case AV_CODEC_ID_ADPCM_IMA_DAT4:

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

  604.         case AV_CODEC_ID_ADPCM_IMA_AMV:     header_size = 8;           break;

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

  606.     }

  607.     if (header_size > 0)

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

  609. 

  610.     /* more complex formats */

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

  612.     case AV_CODEC_ID_ADPCM_EA:

  613.         has_coded_samples = 1;

  614.         *coded_samples  = bytestream2_get_le32(gb);

  615.         *coded_samples -= *coded_samples % 28;

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

  617.         break;

  618.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  619.         has_coded_samples = 1;

  620.         *coded_samples = bytestream2_get_le32(gb);

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

  622.         break;

  623.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

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

  625.         break;

  626.     case AV_CODEC_ID_ADPCM_EA_R1:

  627.     case AV_CODEC_ID_ADPCM_EA_R2:

  628.     case AV_CODEC_ID_ADPCM_EA_R3:

  629.         /* maximum number of samples */

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

  631.         has_coded_samples = 1;

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

  633.         case AV_CODEC_ID_ADPCM_EA_R1:

  634.             header_size    = 4 + 9 * ch;

  635.             *coded_samples = bytestream2_get_le32(gb);

  636.             break;

  637.         case AV_CODEC_ID_ADPCM_EA_R2:

  638.             header_size    = 4 + 5 * ch;

  639.             *coded_samples = bytestream2_get_le32(gb);

  640.             break;

  641.         case AV_CODEC_ID_ADPCM_EA_R3:

  642.             header_size    = 4 + 5 * ch;

  643.             *coded_samples = bytestream2_get_be32(gb);

  644.             break;

  645.         }

  646.         *coded_samples -= *coded_samples % 28;

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

  648.         nb_samples     -= nb_samples % 28;

  649.         *approx_nb_samples = 1;

  650.         break;

  651.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  652.         if (avctx->block_align > 0)

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

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

  655.         break;

  656.     case AV_CODEC_ID_ADPCM_IMA_DK4:

  657.         if (avctx->block_align > 0)

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

  659.         if (buf_size < 4 * ch)

  660.             return AVERROR_INVALIDDATA;

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

  662.         break;

  663.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  664.         if (avctx->block_align > 0)

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

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

  667.         break;

  668.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  669.     {

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

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

  672.         if (avctx->block_align > 0)

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

  674.         if (buf_size < 4 * ch)

  675.             return AVERROR_INVALIDDATA;

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

  677.         break;

  678.     }

  679.     case AV_CODEC_ID_ADPCM_MS:

  680.         if (avctx->block_align > 0)

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

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

  683.         break;

  684.     case AV_CODEC_ID_ADPCM_MTAF:

  685.         if (avctx->block_align > 0)

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

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

  688.         break;

  689.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  690.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  691.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  692.     {

  693.         int samples_per_byte;

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

  695.         case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;

  696.         case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;

  697.         case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;

  698.         }

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

  700.             if (buf_size < ch)

  701.                 return AVERROR_INVALIDDATA;

  702.             nb_samples++;

  703.             buf_size -= ch;

  704.         }

  705.         nb_samples += buf_size * samples_per_byte / ch;

  706.         break;

  707.     }

  708.     case AV_CODEC_ID_ADPCM_SWF:

  709.     {

  710.         int buf_bits       = buf_size * 8 - 2;

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

  712.         int block_hdr_size = 22 * ch;

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

  714.         int nblocks        = buf_bits / block_size;

  715.         int bits_left      = buf_bits - nblocks * block_size;

  716.         nb_samples         = nblocks * 4096;

  717.         if (bits_left >= block_hdr_size)

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

  719.         break;

  720.     }

  721.     case AV_CODEC_ID_ADPCM_THP:

  722.     case AV_CODEC_ID_ADPCM_THP_LE:

  723.         if (avctx->extradata) {

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

  725.             break;

  726.         }

  727.         has_coded_samples = 1;

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

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

  730.                           bytestream2_get_le32(gb) :

  731.                           bytestream2_get_be32(gb);

  732.         buf_size       -= 8 + 36 * ch;

  733.         buf_size       /= ch;

  734.         nb_samples      = buf_size / 8 * 14;

  735.         if (buf_size % 8 > 1)

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

  737.         *approx_nb_samples = 1;

  738.         break;

  739.     case AV_CODEC_ID_ADPCM_AFC:

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

  741.         break;

  742.     case AV_CODEC_ID_ADPCM_XA:

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

  744.         break;

  745.     case AV_CODEC_ID_ADPCM_DTK:

  746.     case AV_CODEC_ID_ADPCM_PSX:

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

  748.         break;

  749.     }

  750. 

  751.     /* validate coded sample count */

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

  753.         return AVERROR_INVALIDDATA;

  754. 

  755.     return nb_samples;

  756. }

  757. 

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

  759.                               int *got_frame_ptr, AVPacket *avpkt)

  760. {

  761.     AVFrame *frame     = data;

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

  763.     int buf_size = avpkt->size;

  764.     ADPCMDecodeContext *c = avctx->priv_data;

  765.     ADPCMChannelStatus *cs;

  766.     int n, m, channel, i;

  767.     int16_t *samples;

  768.     int16_t **samples_p;

  769.     int st; /* stereo */

  770.     int count1, count2;

  771.     int nb_samples, coded_samples, approx_nb_samples, ret;

  772.     GetByteContext gb;

  773. 

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

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

  776.     if (nb_samples <= 0) {

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

  778.         return AVERROR_INVALIDDATA;

  779.     }

  780. 

  781.     /* get output buffer */

  782.     frame->nb_samples = nb_samples;

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

  784.         return ret;

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

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

  787. 

  788.     /* use coded_samples when applicable */

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

  790.     if (coded_samples) {

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

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

  793.         frame->nb_samples = nb_samples = coded_samples;

  794.     }

  795. 

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

  797. 

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

  799.     case AV_CODEC_ID_ADPCM_IMA_QT:

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

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

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

  803.             int predictor;

  804.             int step_index;

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

  806.             /* (pppppp) (piiiiiii) */

  807. 

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

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

  810.             step_index = predictor & 0x7F;

  811.             predictor &= ~0x7F;

  812. 

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

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

  815.                 if (diff < 0)

  816.                     diff = - diff;

  817.                 if (diff > 0x7f)

  818.                     goto update;

  819.             } else {

  820.             update:

  821.                 cs->step_index = step_index;

  822.                 cs->predictor = predictor;

  823.             }

  824. 

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

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

  827.                        channel, cs->step_index);

  828.                 return AVERROR_INVALIDDATA;

  829.             }

  830. 

  831.             samples = samples_p[channel];

  832. 

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

  834.                 int byte = bytestream2_get_byteu(&gb);

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

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

  837.             }

  838.         }

  839.         break;

  840.     case AV_CODEC_ID_ADPCM_IMA_WAV:

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

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

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

  844. 

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

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

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

  848.                        i, cs->step_index);

  849.                 return AVERROR_INVALIDDATA;

  850.             }

  851.         }

  852. 

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

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

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

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

  857.             GetBitContext g;

  858. 

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

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

  861.                     int j;

  862. 

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

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

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

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

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

  868.                     }

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

  870.                     if (ret < 0)

  871.                         return ret;

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

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

  874.                                           avctx->bits_per_coded_sample);

  875.                     }

  876.                 }

  877.             }

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

  879.         } else {

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

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

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

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

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

  885.                     int v = bytestream2_get_byteu(&gb);

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

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

  888.                 }

  889.             }

  890.         }

  891.         }

  892.         break;

  893.     case AV_CODEC_ID_ADPCM_4XM:

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

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

  896. 

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

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

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

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

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

  902.                 return AVERROR_INVALIDDATA;

  903.             }

  904.         }

  905. 

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

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

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

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

  910.                 int v = bytestream2_get_byteu(&gb);

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

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

  913.             }

  914.         }

  915.         break;

  916.     case AV_CODEC_ID_ADPCM_AGM:

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

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

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

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

  921. 

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

  923.             int v = bytestream2_get_byteu(&gb);

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

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

  926.         }

  927.         break;

  928.     case AV_CODEC_ID_ADPCM_MS:

  929.     {

  930.         int block_predictor;

  931. 

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

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

  934.                 samples = samples_p[channel];

  935.                 block_predictor = bytestream2_get_byteu(&gb);

  936.                 if (block_predictor > 6) {

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

  938.                            channel, block_predictor);

  939.                     return AVERROR_INVALIDDATA;

  940.                 }

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

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

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

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

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

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

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

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

  949.                     int byte = bytestream2_get_byteu(&gb);

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

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

  952.                 }

  953.             }

  954.         } else {

  955.             block_predictor = bytestream2_get_byteu(&gb);

  956.             if (block_predictor > 6) {

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

  958.                        block_predictor);

  959.                 return AVERROR_INVALIDDATA;

  960.             }

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

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

  963.             if (st) {

  964.                 block_predictor = bytestream2_get_byteu(&gb);

  965.                 if (block_predictor > 6) {

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

  967.                            block_predictor);

  968.                     return AVERROR_INVALIDDATA;

  969.                 }

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

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

  972.             }

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

  974.             if (st){

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

  976.             }

  977. 

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

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

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

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

  982. 

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

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

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

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

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

  988.                 int byte = bytestream2_get_byteu(&gb);

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

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

  991.             }

  992.         }

  993.         break;

  994.     }

  995.     case AV_CODEC_ID_ADPCM_MTAF:

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

  997.             bytestream2_skipu(&gb, 4);

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

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

  1000.             c->status[channel    ].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  1001.             bytestream2_skipu(&gb, 2);

  1002.             c->status[channel + 1].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  1003.             bytestream2_skipu(&gb, 2);

  1004.             for (n = 0; n < nb_samples; n+=2) {

  1005.                 int v = bytestream2_get_byteu(&gb);

  1006.                 samples_p[channel][n    ] = adpcm_mtaf_expand_nibble(&c->status[channel], v & 0x0F);

  1007.                 samples_p[channel][n + 1] = adpcm_mtaf_expand_nibble(&c->status[channel], v >> 4  );

  1008.             }

  1009.             for (n = 0; n < nb_samples; n+=2) {

  1010.                 int v = bytestream2_get_byteu(&gb);

  1011.                 samples_p[channel + 1][n    ] = adpcm_mtaf_expand_nibble(&c->status[channel + 1], v & 0x0F);

  1012.                 samples_p[channel + 1][n + 1] = adpcm_mtaf_expand_nibble(&c->status[channel + 1], v >> 4  );

  1013.             }

  1014.         }

  1015.         break;

  1016.     case AV_CODEC_ID_ADPCM_IMA_DK4:

  1017.         for (channel = 0; channel < avctx->channels; channel++) {

  1018.             cs = &c->status[channel];

  1019.             cs->predictor  = *samples++ = sign_extend(bytestream2_get_le16u(&gb), 16);

  1020.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1021.             if (cs->step_index > 88u){

  1022.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1023.                        channel, cs->step_index);

  1024.                 return AVERROR_INVALIDDATA;

  1025.             }

  1026.         }

  1027.         for (n = (nb_samples - 1) >> (1 - st); n > 0; n--) {

  1028.             int v = bytestream2_get_byteu(&gb);

  1029.             *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4  , 3);

  1030.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

  1031.         }

  1032.         break;

  1033.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  1034.     {

  1035.         int last_byte = 0;

  1036.         int nibble;

  1037.         int decode_top_nibble_next = 0;

  1038.         int diff_channel;

  1039.         const int16_t *samples_end = samples + avctx->channels * nb_samples;

  1040. 

  1041.         bytestream2_skipu(&gb, 10);

  1042.         c->status[0].predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1043.         c->status[1].predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1044.         c->status[0].step_index = bytestream2_get_byteu(&gb);

  1045.         c->status[1].step_index = bytestream2_get_byteu(&gb);

  1046.         if (c->status[0].step_index > 88u || c->status[1].step_index > 88u){

  1047.             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i/%i\n",

  1048.                    c->status[0].step_index, c->status[1].step_index);

  1049.             return AVERROR_INVALIDDATA;

  1050.         }

  1051.         /* sign extend the predictors */

  1052.         diff_channel = c->status[1].predictor;

  1053. 

  1054.         /* DK3 ADPCM support macro */

  1055. #define DK3_GET_NEXT_NIBBLE() \

  1056.     if (decode_top_nibble_next) { \

  1057.         nibble = last_byte >> 4; \

  1058.         decode_top_nibble_next = 0; \

  1059.     } else { \

  1060.         last_byte = bytestream2_get_byteu(&gb); \

  1061.         nibble = last_byte & 0x0F; \

  1062.         decode_top_nibble_next = 1; \

  1063.     }

  1064. 

  1065.         while (samples < samples_end) {

  1066. 

  1067.             /* for this algorithm, c->status[0] is the sum channel and

  1068.              * c->status[1] is the diff channel */

  1069. 

  1070.             /* process the first predictor of the sum channel */

  1071.             DK3_GET_NEXT_NIBBLE();

  1072.             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

  1073. 

  1074.             /* process the diff channel predictor */

  1075.             DK3_GET_NEXT_NIBBLE();

  1076.             adpcm_ima_expand_nibble(&c->status[1], nibble, 3);

  1077. 

  1078.             /* process the first pair of stereo PCM samples */

  1079.             diff_channel = (diff_channel + c->status[1].predictor) / 2;

  1080.             *samples++ = c->status[0].predictor + c->status[1].predictor;

  1081.             *samples++ = c->status[0].predictor - c->status[1].predictor;

  1082. 

  1083.             /* process the second predictor of the sum channel */

  1084.             DK3_GET_NEXT_NIBBLE();

  1085.             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

  1086. 

  1087.             /* process the second pair of stereo PCM samples */

  1088.             diff_channel = (diff_channel + c->status[1].predictor) / 2;

  1089.             *samples++ = c->status[0].predictor + c->status[1].predictor;

  1090.             *samples++ = c->status[0].predictor - c->status[1].predictor;

  1091.         }

  1092. 

  1093.         if ((bytestream2_tell(&gb) & 1))

  1094.             bytestream2_skip(&gb, 1);

  1095.         break;

  1096.     }

  1097.     case AV_CODEC_ID_ADPCM_IMA_ISS:

  1098.         for (channel = 0; channel < avctx->channels; channel++) {

  1099.             cs = &c->status[channel];

  1100.             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1101.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1102.             if (cs->step_index > 88u){

  1103.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1104.                        channel, cs->step_index);

  1105.                 return AVERROR_INVALIDDATA;

  1106.             }

  1107.         }

  1108. 

  1109.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1110.             int v1, v2;

  1111.             int v = bytestream2_get_byteu(&gb);

  1112.             /* nibbles are swapped for mono */

  1113.             if (st) {

  1114.                 v1 = v >> 4;

  1115.                 v2 = v & 0x0F;

  1116.             } else {

  1117.                 v2 = v >> 4;

  1118.                 v1 = v & 0x0F;

  1119.             }

  1120.             *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);

  1121.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);

  1122.         }

  1123.         break;

  1124.     case AV_CODEC_ID_ADPCM_IMA_DAT4:

  1125.         for (channel = 0; channel < avctx->channels; channel++) {

  1126.             cs = &c->status[channel];

  1127.             samples = samples_p[channel];

  1128.             bytestream2_skip(&gb, 4);

  1129.             for (n = 0; n < nb_samples; n += 2) {

  1130.                 int v = bytestream2_get_byteu(&gb);

  1131.                 *samples++ = adpcm_ima_expand_nibble(cs, v >> 4  , 3);

  1132.                 *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);

  1133.             }

  1134.         }

  1135.         break;

  1136.     case AV_CODEC_ID_ADPCM_IMA_APC:

  1137.         while (bytestream2_get_bytes_left(&gb) > 0) {

  1138.             int v = bytestream2_get_byteu(&gb);

  1139.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  v >> 4  , 3);

  1140.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

  1141.         }

  1142.         break;

  1143.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  1144.         while (bytestream2_get_bytes_left(&gb) > 0) {

  1145.             int v = bytestream2_get_byteu(&gb);

  1146.             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[0],  v >> 4  );

  1147.             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[st], v & 0x0F);

  1148.         }

  1149.         break;

  1150.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  1151.         for (channel = 0; channel < avctx->channels; channel++) {

  1152.             cs = &c->status[channel];

  1153.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1154.             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1155.             if (cs->step_index > 88u){

  1156.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1157.                        channel, cs->step_index);

  1158.                 return AVERROR_INVALIDDATA;

  1159.             }

  1160.         }

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

  1162.             int byte[2];

  1163. 

  1164.             byte[0] = bytestream2_get_byteu(&gb);

  1165.             if (st)

  1166.                 byte[1] = bytestream2_get_byteu(&gb);

  1167.             for(channel = 0; channel < avctx->channels; channel++) {

  1168.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] & 0x0F, 3);

  1169.             }

  1170.             for(channel = 0; channel < avctx->channels; channel++) {

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

  1172.             }

  1173.         }

  1174.         break;

  1175.     case AV_CODEC_ID_ADPCM_IMA_WS:

  1176.         if (c->vqa_version == 3) {

  1177.             for (channel = 0; channel < avctx->channels; channel++) {

  1178.                 int16_t *smp = samples_p[channel];

  1179. 

  1180.                 for (n = nb_samples / 2; n > 0; n--) {

  1181.                     int v = bytestream2_get_byteu(&gb);

  1182.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1183.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1184.                 }

  1185.             }

  1186.         } else {

  1187.             for (n = nb_samples / 2; n > 0; n--) {

  1188.                 for (channel = 0; channel < avctx->channels; channel++) {

  1189.                     int v = bytestream2_get_byteu(&gb);

  1190.                     *samples++  = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1191.                     samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1192.                 }

  1193.                 samples += avctx->channels;

  1194.             }

  1195.         }

  1196.         bytestream2_seek(&gb, 0, SEEK_END);

  1197.         break;

  1198.     case AV_CODEC_ID_ADPCM_XA:

  1199.     {

  1200.         int16_t *out0 = samples_p[0];

  1201.         int16_t *out1 = samples_p[1];

  1202.         int samples_per_block = 28 * (3 - avctx->channels) * 4;

  1203.         int sample_offset = 0;

  1204.         int bytes_remaining;

  1205.         while (bytestream2_get_bytes_left(&gb) >= 128) {

  1206.             if ((ret = xa_decode(avctx, out0, out1, buf + bytestream2_tell(&gb),

  1207.                                  &c->status[0], &c->status[1],

  1208.                                  avctx->channels, sample_offset)) < 0)

  1209.                 return ret;

  1210.             bytestream2_skipu(&gb, 128);

  1211.             sample_offset += samples_per_block;

  1212.         }

  1213.         /* Less than a full block of data left, e.g. when reading from

  1214.          * 2324 byte per sector XA; the remainder is padding */

  1215.         bytes_remaining = bytestream2_get_bytes_left(&gb);

  1216.         if (bytes_remaining > 0) {

  1217.             bytestream2_skip(&gb, bytes_remaining);

  1218.         }

  1219.         break;

  1220.     }

  1221.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  1222.         for (i=0; i<=st; i++) {

  1223.             c->status[i].step_index = bytestream2_get_le32u(&gb);

  1224.             if (c->status[i].step_index > 88u) {

  1225.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1226.                        i, c->status[i].step_index);

  1227.                 return AVERROR_INVALIDDATA;

  1228.             }

  1229.         }

  1230.         for (i=0; i<=st; i++)

  1231.             c->status[i].predictor  = bytestream2_get_le32u(&gb);

  1232. 

  1233.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1234.             int byte   = bytestream2_get_byteu(&gb);

  1235.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   3);

  1236.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);

  1237.         }

  1238.         break;

  1239.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  1240.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1241.             int byte = bytestream2_get_byteu(&gb);

  1242.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   6);

  1243.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);

  1244.         }

  1245.         break;

  1246.     case AV_CODEC_ID_ADPCM_EA:

  1247.     {

  1248.         int previous_left_sample, previous_right_sample;

  1249.         int current_left_sample, current_right_sample;

  1250.         int next_left_sample, next_right_sample;

  1251.         int coeff1l, coeff2l, coeff1r, coeff2r;

  1252.         int shift_left, shift_right;

  1253. 

  1254.         /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,

  1255.            each coding 28 stereo samples. */

  1256. 

  1257.         if(avctx->channels != 2)

  1258.             return AVERROR_INVALIDDATA;

  1259. 

  1260.         current_left_sample   = sign_extend(bytestream2_get_le16u(&gb), 16);

  1261.         previous_left_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1262.         current_right_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1263.         previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

  1264. 

  1265.         for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1266.             int byte = bytestream2_get_byteu(&gb);

  1267.             coeff1l = ea_adpcm_table[ byte >> 4       ];

  1268.             coeff2l = ea_adpcm_table[(byte >> 4  ) + 4];

  1269.             coeff1r = ea_adpcm_table[ byte & 0x0F];

  1270.             coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];

  1271. 

  1272.             byte = bytestream2_get_byteu(&gb);

  1273.             shift_left  = 20 - (byte >> 4);

  1274.             shift_right = 20 - (byte & 0x0F);

  1275. 

  1276.             for (count2 = 0; count2 < 28; count2++) {

  1277.                 byte = bytestream2_get_byteu(&gb);

  1278.                 next_left_sample  = sign_extend(byte >> 4, 4) << shift_left;

  1279.                 next_right_sample = sign_extend(byte,      4) << shift_right;

  1280. 

  1281.                 next_left_sample = (next_left_sample +

  1282.                     (current_left_sample * coeff1l) +

  1283.                     (previous_left_sample * coeff2l) + 0x80) >> 8;

  1284.                 next_right_sample = (next_right_sample +

  1285.                     (current_right_sample * coeff1r) +

  1286.                     (previous_right_sample * coeff2r) + 0x80) >> 8;

  1287. 

  1288.                 previous_left_sample = current_left_sample;

  1289.                 current_left_sample = av_clip_int16(next_left_sample);

  1290.                 previous_right_sample = current_right_sample;

  1291.                 current_right_sample = av_clip_int16(next_right_sample);

  1292.                 *samples++ = current_left_sample;

  1293.                 *samples++ = current_right_sample;

  1294.             }

  1295.         }

  1296. 

  1297.         bytestream2_skip(&gb, 2); // Skip terminating 0x0000

  1298. 

  1299.         break;

  1300.     }

  1301.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

  1302.     {

  1303.         int coeff[2][2], shift[2];

  1304. 

  1305.         for(channel = 0; channel < avctx->channels; channel++) {

  1306.             int byte = bytestream2_get_byteu(&gb);

  1307.             for (i=0; i<2; i++)

  1308.                 coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];

  1309.             shift[channel] = 20 - (byte & 0x0F);

  1310.         }

  1311.         for (count1 = 0; count1 < nb_samples / 2; count1++) {

  1312.             int byte[2];

  1313. 

  1314.             byte[0] = bytestream2_get_byteu(&gb);

  1315.             if (st) byte[1] = bytestream2_get_byteu(&gb);

  1316.             for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */

  1317.                 for(channel = 0; channel < avctx->channels; channel++) {

  1318.                     int sample = sign_extend(byte[channel] >> i, 4) << shift[channel];

  1319.                     sample = (sample +

  1320.                              c->status[channel].sample1 * coeff[channel][0] +

  1321.                              c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;

  1322.                     c->status[channel].sample2 = c->status[channel].sample1;

  1323.                     c->status[channel].sample1 = av_clip_int16(sample);

  1324.                     *samples++ = c->status[channel].sample1;

  1325.                 }

  1326.             }

  1327.         }

  1328.         bytestream2_seek(&gb, 0, SEEK_END);

  1329.         break;

  1330.     }

  1331.     case AV_CODEC_ID_ADPCM_EA_R1:

  1332.     case AV_CODEC_ID_ADPCM_EA_R2:

  1333.     case AV_CODEC_ID_ADPCM_EA_R3: {

  1334.         /* channel numbering

  1335.            2chan: 0=fl, 1=fr

  1336.            4chan: 0=fl, 1=rl, 2=fr, 3=rr

  1337.            6chan: 0=fl, 1=c,  2=fr, 3=rl,  4=rr, 5=sub */

  1338.         const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;

  1339.         int previous_sample, current_sample, next_sample;

  1340.         int coeff1, coeff2;

  1341.         int shift;

  1342.         unsigned int channel;

  1343.         uint16_t *samplesC;

  1344.         int count = 0;

  1345.         int offsets[6];

  1346. 

  1347.         for (channel=0; channel<avctx->channels; channel++)

  1348.             offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :

  1349.                                              bytestream2_get_le32(&gb)) +

  1350.                                (avctx->channels + 1) * 4;

  1351. 

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

  1353.             bytestream2_seek(&gb, offsets[channel], SEEK_SET);

  1354.             samplesC = samples_p[channel];

  1355. 

  1356.             if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {

  1357.                 current_sample  = sign_extend(bytestream2_get_le16(&gb), 16);

  1358.                 previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);

  1359.             } else {

  1360.                 current_sample  = c->status[channel].predictor;

  1361.                 previous_sample = c->status[channel].prev_sample;

  1362.             }

  1363. 

  1364.             for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1365.                 int byte = bytestream2_get_byte(&gb);

  1366.                 if (byte == 0xEE) {  /* only seen in R2 and R3 */

  1367.                     current_sample  = sign_extend(bytestream2_get_be16(&gb), 16);

  1368.                     previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);

  1369. 

  1370.                     for (count2=0; count2<28; count2++)

  1371.                         *samplesC++ = sign_extend(bytestream2_get_be16(&gb), 16);

  1372.                 } else {

  1373.                     coeff1 = ea_adpcm_table[ byte >> 4     ];

  1374.                     coeff2 = ea_adpcm_table[(byte >> 4) + 4];

  1375.                     shift = 20 - (byte & 0x0F);

  1376. 

  1377.                     for (count2=0; count2<28; count2++) {

  1378.                         if (count2 & 1)

  1379.                             next_sample = sign_extend(byte,    4) << shift;

  1380.                         else {

  1381.                             byte = bytestream2_get_byte(&gb);

  1382.                             next_sample = sign_extend(byte >> 4, 4) << shift;

  1383.                         }

  1384. 

  1385.                         next_sample += (current_sample  * coeff1) +

  1386.                                        (previous_sample * coeff2);

  1387.                         next_sample = av_clip_int16(next_sample >> 8);

  1388. 

  1389.                         previous_sample = current_sample;

  1390.                         current_sample  = next_sample;

  1391.                         *samplesC++ = current_sample;

  1392.                     }

  1393.                 }

  1394.             }

  1395.             if (!count) {

  1396.                 count = count1;

  1397.             } else if (count != count1) {

  1398.                 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");

  1399.                 count = FFMAX(count, count1);

  1400.             }

  1401. 

  1402.             if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {

  1403.                 c->status[channel].predictor   = current_sample;

  1404.                 c->status[channel].prev_sample = previous_sample;

  1405.             }

  1406.         }

  1407. 

  1408.         frame->nb_samples = count * 28;

  1409.         bytestream2_seek(&gb, 0, SEEK_END);

  1410.         break;

  1411.     }

  1412.     case AV_CODEC_ID_ADPCM_EA_XAS:

  1413.         for (channel=0; channel<avctx->channels; channel++) {

  1414.             int coeff[2][4], shift[4];

  1415.             int16_t *s = samples_p[channel];

  1416.             for (n = 0; n < 4; n++, s += 32) {

  1417.                 int val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1418.                 for (i=0; i<2; i++)

  1419.                     coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];

  1420.                 s[0] = val & ~0x0F;

  1421. 

  1422.                 val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1423.                 shift[n] = 20 - (val & 0x0F);

  1424.                 s[1] = val & ~0x0F;

  1425.             }

  1426. 

  1427.             for (m=2; m<32; m+=2) {

  1428.                 s = &samples_p[channel][m];

  1429.                 for (n = 0; n < 4; n++, s += 32) {

  1430.                     int level, pred;

  1431.                     int byte = bytestream2_get_byteu(&gb);

  1432. 

  1433.                     level = sign_extend(byte >> 4, 4) << shift[n];

  1434.                     pred  = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];

  1435.                     s[0]  = av_clip_int16((level + pred + 0x80) >> 8);

  1436. 

  1437.                     level = sign_extend(byte, 4) << shift[n];

  1438.                     pred  = s[0] * coeff[0][n] + s[-1] * coeff[1][n];

  1439.                     s[1]  = av_clip_int16((level + pred + 0x80) >> 8);

  1440.                 }

  1441.             }

  1442.         }

  1443.         break;

  1444.     case AV_CODEC_ID_ADPCM_IMA_AMV:

  1445.         c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  1446.         c->status[0].step_index = bytestream2_get_byteu(&gb);

  1447.         bytestream2_skipu(&gb, 5);

  1448.         if (c->status[0].step_index > 88u) {

  1449.             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1450.                    c->status[0].step_index);

  1451.             return AVERROR_INVALIDDATA;

  1452.         }

  1453. 

  1454.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1455.             int v = bytestream2_get_byteu(&gb);

  1456. 

  1457.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);

  1458.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);

  1459.         }

  1460.         break;

  1461.     case AV_CODEC_ID_ADPCM_IMA_SMJPEG:

  1462.         for (i = 0; i < avctx->channels; i++) {

  1463.             c->status[i].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);

  1464.             c->status[i].step_index = bytestream2_get_byteu(&gb);

  1465.             bytestream2_skipu(&gb, 1);

  1466.             if (c->status[i].step_index > 88u) {

  1467.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1468.                        c->status[i].step_index);

  1469.                 return AVERROR_INVALIDDATA;

  1470.             }

  1471.         }

  1472. 

  1473.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1474.             int v = bytestream2_get_byteu(&gb);

  1475. 

  1476.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[0 ], v >> 4, 3);

  1477.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0xf, 3);

  1478.         }

  1479.         break;

  1480.     case AV_CODEC_ID_ADPCM_CT:

  1481.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1482.             int v = bytestream2_get_byteu(&gb);

  1483.             *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4  );

  1484.             *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);

  1485.         }

  1486.         break;

  1487.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  1488.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  1489.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  1490.         if (!c->status[0].step_index) {

  1491.             /* the first byte is a raw sample */

  1492.             *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1493.             if (st)

  1494.                 *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1495.             c->status[0].step_index = 1;

  1496.             nb_samples--;

  1497.         }

  1498.         if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {

  1499.             for (n = nb_samples >> (1 - st); n > 0; n--) {

  1500.                 int byte = bytestream2_get_byteu(&gb);

  1501.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1502.                                                        byte >> 4,   4, 0);

  1503.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1504.                                                        byte & 0x0F, 4, 0);

  1505.             }

  1506.         } else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {

  1507.             for (n = (nb_samples<<st) / 3; n > 0; n--) {

  1508.                 int byte = bytestream2_get_byteu(&gb);

  1509.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1510.                                                         byte >> 5        , 3, 0);

  1511.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1512.                                                        (byte >> 2) & 0x07, 3, 0);

  1513.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1514.                                                         byte & 0x03,       2, 0);

  1515.             }

  1516.         } else {

  1517.             for (n = nb_samples >> (2 - st); n > 0; n--) {

  1518.                 int byte = bytestream2_get_byteu(&gb);

  1519.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1520.                                                         byte >> 6        , 2, 2);

  1521.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1522.                                                        (byte >> 4) & 0x03, 2, 2);

  1523.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1524.                                                        (byte >> 2) & 0x03, 2, 2);

  1525.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1526.                                                         byte & 0x03,       2, 2);

  1527.             }

  1528.         }

  1529.         break;

  1530.     case AV_CODEC_ID_ADPCM_SWF:

  1531.         adpcm_swf_decode(avctx, buf, buf_size, samples);

  1532.         bytestream2_seek(&gb, 0, SEEK_END);

  1533.         break;

  1534.     case AV_CODEC_ID_ADPCM_YAMAHA:

  1535.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1536.             int v = bytestream2_get_byteu(&gb);

  1537.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);

  1538.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4  );

  1539.         }

  1540.         break;

  1541.     case AV_CODEC_ID_ADPCM_AICA:

  1542.         if (!c->has_status) {

  1543.             for (channel = 0; channel < avctx->channels; channel++)

  1544.                 c->status[channel].step = 0;

  1545.             c->has_status = 1;

  1546.         }

  1547.         for (channel = 0; channel < avctx->channels; channel++) {

  1548.             samples = samples_p[channel];

  1549.             for (n = nb_samples >> 1; n > 0; n--) {

  1550.                 int v = bytestream2_get_byteu(&gb);

  1551.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v & 0x0F);

  1552.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v >> 4  );

  1553.             }

  1554.         }

  1555.         break;

  1556.     case AV_CODEC_ID_ADPCM_AFC:

  1557.     {

  1558.         int samples_per_block;

  1559.         int blocks;

  1560. 

  1561.         if (avctx->extradata && avctx->extradata_size == 1 && avctx->extradata[0]) {

  1562.             samples_per_block = avctx->extradata[0] / 16;

  1563.             blocks = nb_samples / avctx->extradata[0];

  1564.         } else {

  1565.             samples_per_block = nb_samples / 16;

  1566.             blocks = 1;

  1567.         }

  1568. 

  1569.         for (m = 0; m < blocks; m++) {

  1570.         for (channel = 0; channel < avctx->channels; channel++) {

  1571.             int prev1 = c->status[channel].sample1;

  1572.             int prev2 = c->status[channel].sample2;

  1573. 

  1574.             samples = samples_p[channel] + m * 16;

  1575.             /* Read in every sample for this channel.  */

  1576.             for (i = 0; i < samples_per_block; i++) {

  1577.                 int byte = bytestream2_get_byteu(&gb);

  1578.                 int scale = 1 << (byte >> 4);

  1579.                 int index = byte & 0xf;

  1580.                 int factor1 = ff_adpcm_afc_coeffs[0][index];

  1581.                 int factor2 = ff_adpcm_afc_coeffs[1][index];

  1582. 

  1583.                 /* Decode 16 samples.  */

  1584.                 for (n = 0; n < 16; n++) {

  1585.                     int32_t sampledat;

  1586. 

  1587.                     if (n & 1) {

  1588.                         sampledat = sign_extend(byte, 4);

  1589.                     } else {

  1590.                         byte = bytestream2_get_byteu(&gb);

  1591.                         sampledat = sign_extend(byte >> 4, 4);

  1592.                     }

  1593. 

  1594.                     sampledat = ((prev1 * factor1 + prev2 * factor2) +

  1595.                                  ((sampledat * scale) << 11)) >> 11;

  1596.                     *samples = av_clip_int16(sampledat);

  1597.                     prev2 = prev1;

  1598.                     prev1 = *samples++;

  1599.                 }

  1600.             }

  1601. 

  1602.             c->status[channel].sample1 = prev1;

  1603.             c->status[channel].sample2 = prev2;

  1604.         }

  1605.         }

  1606.         bytestream2_seek(&gb, 0, SEEK_END);

  1607.         break;

  1608.     }

  1609.     case AV_CODEC_ID_ADPCM_THP:

  1610.     case AV_CODEC_ID_ADPCM_THP_LE:

  1611.     {

  1612.         int table[14][16];

  1613.         int ch;

  1614. 

  1615. #define THP_GET16(g) \

  1616.     sign_extend( \

  1617.         avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE ? \

  1618.         bytestream2_get_le16u(&(g)) : \

  1619.         bytestream2_get_be16u(&(g)), 16)

  1620. 

  1621.         if (avctx->extradata) {

  1622.             GetByteContext tb;

  1623.             if (avctx->extradata_size < 32 * avctx->channels) {

  1624.                 av_log(avctx, AV_LOG_ERROR, "Missing coeff table\n");

  1625.                 return AVERROR_INVALIDDATA;

  1626.             }

  1627. 

  1628.             bytestream2_init(&tb, avctx->extradata, avctx->extradata_size);

  1629.             for (i = 0; i < avctx->channels; i++)

  1630.                 for (n = 0; n < 16; n++)

  1631.                     table[i][n] = THP_GET16(tb);

  1632.         } else {

  1633.             for (i = 0; i < avctx->channels; i++)

  1634.                 for (n = 0; n < 16; n++)

  1635.                     table[i][n] = THP_GET16(gb);

  1636. 

  1637.             if (!c->has_status) {

  1638.                 /* Initialize the previous sample.  */

  1639.                 for (i = 0; i < avctx->channels; i++) {

  1640.                     c->status[i].sample1 = THP_GET16(gb);

  1641.                     c->status[i].sample2 = THP_GET16(gb);

  1642.                 }

  1643.                 c->has_status = 1;

  1644.             } else {

  1645.                 bytestream2_skip(&gb, avctx->channels * 4);

  1646.             }

  1647.         }

  1648. 

  1649.         for (ch = 0; ch < avctx->channels; ch++) {

  1650.             samples = samples_p[ch];

  1651. 

  1652.             /* Read in every sample for this channel.  */

  1653.             for (i = 0; i < (nb_samples + 13) / 14; i++) {

  1654.                 int byte = bytestream2_get_byteu(&gb);

  1655.                 int index = (byte >> 4) & 7;

  1656.                 unsigned int exp = byte & 0x0F;

  1657.                 int factor1 = table[ch][index * 2];

  1658.                 int factor2 = table[ch][index * 2 + 1];

  1659. 

  1660.                 /* Decode 14 samples.  */

  1661.                 for (n = 0; n < 14 && (i * 14 + n < nb_samples); n++) {

  1662.                     int32_t sampledat;

  1663. 

  1664.                     if (n & 1) {

  1665.                         sampledat = sign_extend(byte, 4);

  1666.                     } else {

  1667.                         byte = bytestream2_get_byteu(&gb);

  1668.                         sampledat = sign_extend(byte >> 4, 4);

  1669.                     }

  1670. 

  1671.                     sampledat = ((c->status[ch].sample1 * factor1

  1672.                                 + c->status[ch].sample2 * factor2) >> 11) + (sampledat << exp);

  1673.                     *samples = av_clip_int16(sampledat);

  1674.                     c->status[ch].sample2 = c->status[ch].sample1;

  1675.                     c->status[ch].sample1 = *samples++;

  1676.                 }

  1677.             }

  1678.         }

  1679.         break;

  1680.     }

  1681.     case AV_CODEC_ID_ADPCM_DTK:

  1682.         for (channel = 0; channel < avctx->channels; channel++) {

  1683.             samples = samples_p[channel];

  1684. 

  1685.             /* Read in every sample for this channel.  */

  1686.             for (i = 0; i < nb_samples / 28; i++) {

  1687.                 int byte, header;

  1688.                 if (channel)

  1689.                     bytestream2_skipu(&gb, 1);

  1690.                 header = bytestream2_get_byteu(&gb);

  1691.                 bytestream2_skipu(&gb, 3 - channel);

  1692. 

  1693.                 /* Decode 28 samples.  */

  1694.                 for (n = 0; n < 28; n++) {

  1695.                     int32_t sampledat, prev;

  1696. 

  1697.                     switch (header >> 4) {

  1698.                     case 1:

  1699.                         prev = (c->status[channel].sample1 * 0x3c);

  1700.                         break;

  1701.                     case 2:

  1702.                         prev = (c->status[channel].sample1 * 0x73) - (c->status[channel].sample2 * 0x34);

  1703.                         break;

  1704.                     case 3:

  1705.                         prev = (c->status[channel].sample1 * 0x62) - (c->status[channel].sample2 * 0x37);

  1706.                         break;

  1707.                     default:

  1708.                         prev = 0;

  1709.                     }

  1710. 

  1711.                     prev = av_clip_intp2((prev + 0x20) >> 6, 21);

  1712. 

  1713.                     byte = bytestream2_get_byteu(&gb);

  1714.                     if (!channel)

  1715.                         sampledat = sign_extend(byte, 4);

  1716.                     else

  1717.                         sampledat = sign_extend(byte >> 4, 4);

  1718. 

  1719.                     sampledat = (((sampledat << 12) >> (header & 0xf)) << 6) + prev;

  1720.                     *samples++ = av_clip_int16(sampledat >> 6);

  1721.                     c->status[channel].sample2 = c->status[channel].sample1;

  1722.                     c->status[channel].sample1 = sampledat;

  1723.                 }

  1724.             }

  1725.             if (!channel)

  1726.                 bytestream2_seek(&gb, 0, SEEK_SET);

  1727.         }

  1728.         break;

  1729.     case AV_CODEC_ID_ADPCM_PSX:

  1730.         for (channel = 0; channel < avctx->channels; channel++) {

  1731.             samples = samples_p[channel];

  1732. 

  1733.             /* Read in every sample for this channel.  */

  1734.             for (i = 0; i < nb_samples / 28; i++) {

  1735.                 int filter, shift, flag, byte;

  1736. 

  1737.                 filter = bytestream2_get_byteu(&gb);

  1738.                 shift  = filter & 0xf;

  1739.                 filter = filter >> 4;

  1740.                 if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table))

  1741.                     return AVERROR_INVALIDDATA;

  1742.                 flag   = bytestream2_get_byteu(&gb);

  1743. 

  1744.                 /* Decode 28 samples.  */

  1745.                 for (n = 0; n < 28; n++) {

  1746.                     int sample = 0, scale;

  1747. 

  1748.                     if (flag < 0x07) {

  1749.                         if (n & 1) {

  1750.                             scale = sign_extend(byte >> 4, 4);

  1751.                         } else {

  1752.                             byte  = bytestream2_get_byteu(&gb);

  1753.                             scale = sign_extend(byte, 4);

  1754.                         }

  1755. 

  1756.                         scale  = scale << 12;

  1757.                         sample = (int)((scale >> shift) + (c->status[channel].sample1 * xa_adpcm_table[filter][0] + c->status[channel].sample2 * xa_adpcm_table[filter][1]) / 64);

  1758.                     }

  1759.                     *samples++ = av_clip_int16(sample);

  1760.                     c->status[channel].sample2 = c->status[channel].sample1;

  1761.                     c->status[channel].sample1 = sample;

  1762.                 }

  1763.             }

  1764.         }

  1765.         break;

  1766. 

  1767.     default:

  1768.         av_assert0(0); // unsupported codec_id should not happen

  1769.     }

  1770. 

  1771.     if (avpkt->size && bytestream2_tell(&gb) == 0) {

  1772.         av_log(avctx, AV_LOG_ERROR, "Nothing consumed\n");

  1773.         return AVERROR_INVALIDDATA;

  1774.     }

  1775. 

  1776.     *got_frame_ptr = 1;

  1777. 

  1778.     if (avpkt->size < bytestream2_tell(&gb)) {

  1779.         av_log(avctx, AV_LOG_ERROR, "Overread of %d < %d\n", avpkt->size, bytestream2_tell(&gb));

  1780.         return avpkt->size;

  1781.     }

  1782. 

  1783.     return bytestream2_tell(&gb);

  1784. }

  1785. 

  1786. static void adpcm_flush(AVCodecContext *avctx)

  1787. {

  1788.     ADPCMDecodeContext *c = avctx->priv_data;

  1789.     c->has_status = 0;

  1790. }

  1791. 

  1792. 

  1793. static const enum AVSampleFormat sample_fmts_s16[]  = { AV_SAMPLE_FMT_S16,

  1794.                                                         AV_SAMPLE_FMT_NONE };

  1795. static const enum AVSampleFormat sample_fmts_s16p[] = { AV_SAMPLE_FMT_S16P,

  1796.                                                         AV_SAMPLE_FMT_NONE };

  1797. static const enum AVSampleFormat sample_fmts_both[] = { AV_SAMPLE_FMT_S16,

  1798.                                                         AV_SAMPLE_FMT_S16P,

  1799.                                                         AV_SAMPLE_FMT_NONE };

  1800. 

  1801. #define ADPCM_DECODER(id_, sample_fmts_, name_, long_name_) \

  1802. AVCodec ff_ ## name_ ## _decoder = {                        \

  1803.     .name           = #name_,                               \

  1804.     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \

  1805.     .type           = AVMEDIA_TYPE_AUDIO,                   \

  1806.     .id             = id_,                                  \

  1807.     .priv_data_size = sizeof(ADPCMDecodeContext),           \

  1808.     .init           = adpcm_decode_init,                    \

  1809.     .decode         = adpcm_decode_frame,                   \

  1810.     .flush          = adpcm_flush,                          \

  1811.     .capabilities   = AV_CODEC_CAP_DR1,                     \

  1812.     .sample_fmts    = sample_fmts_,                         \

  1813. }

  1814. 

  1815. /* Note: Do not forget to add new entries to the Makefile as well. */

  1816. ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM,         sample_fmts_s16p, adpcm_4xm,         "ADPCM 4X Movie");

  1817. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AFC,         sample_fmts_s16p, adpcm_afc,         "ADPCM Nintendo Gamecube AFC");

  1818. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AGM,         sample_fmts_s16,  adpcm_agm,         "ADPCM AmuseGraphics Movie");

  1819. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AICA,        sample_fmts_s16p, adpcm_aica,        "ADPCM Yamaha AICA");

  1820. ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT,          sample_fmts_s16,  adpcm_ct,          "ADPCM Creative Technology");

  1821. ADPCM_DECODER(AV_CODEC_ID_ADPCM_DTK,         sample_fmts_s16p, adpcm_dtk,         "ADPCM Nintendo Gamecube DTK");

  1822. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA,          sample_fmts_s16,  adpcm_ea,          "ADPCM Electronic Arts");

  1823. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, sample_fmts_s16,  adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");

  1824. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1,       sample_fmts_s16p, adpcm_ea_r1,       "ADPCM Electronic Arts R1");

  1825. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2,       sample_fmts_s16p, adpcm_ea_r2,       "ADPCM Electronic Arts R2");

  1826. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3,       sample_fmts_s16p, adpcm_ea_r3,       "ADPCM Electronic Arts R3");

  1827. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS,      sample_fmts_s16p, adpcm_ea_xas,      "ADPCM Electronic Arts XAS");

  1828. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV,     sample_fmts_s16,  adpcm_ima_amv,     "ADPCM IMA AMV");

  1829. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC,     sample_fmts_s16,  adpcm_ima_apc,     "ADPCM IMA CRYO APC");

  1830. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DAT4,    sample_fmts_s16,  adpcm_ima_dat4,    "ADPCM IMA Eurocom DAT4");

  1831. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3,     sample_fmts_s16,  adpcm_ima_dk3,     "ADPCM IMA Duck DK3");

  1832. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4,     sample_fmts_s16,  adpcm_ima_dk4,     "ADPCM IMA Duck DK4");

  1833. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, sample_fmts_s16,  adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");

  1834. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, sample_fmts_s16,  adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");

  1835. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS,     sample_fmts_s16,  adpcm_ima_iss,     "ADPCM IMA Funcom ISS");

  1836. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI,     sample_fmts_s16,  adpcm_ima_oki,     "ADPCM IMA Dialogic OKI");

  1837. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT,      sample_fmts_s16p, adpcm_ima_qt,      "ADPCM IMA QuickTime");

  1838. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_RAD,     sample_fmts_s16,  adpcm_ima_rad,     "ADPCM IMA Radical");

  1839. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG,  sample_fmts_s16,  adpcm_ima_smjpeg,  "ADPCM IMA Loki SDL MJPEG");

  1840. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV,     sample_fmts_s16p, adpcm_ima_wav,     "ADPCM IMA WAV");

  1841. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS,      sample_fmts_both, adpcm_ima_ws,      "ADPCM IMA Westwood");

  1842. ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS,          sample_fmts_both, adpcm_ms,          "ADPCM Microsoft");

  1843. ADPCM_DECODER(AV_CODEC_ID_ADPCM_MTAF,        sample_fmts_s16p, adpcm_mtaf,        "ADPCM MTAF");

  1844. ADPCM_DECODER(AV_CODEC_ID_ADPCM_PSX,         sample_fmts_s16p, adpcm_psx,         "ADPCM Playstation");

  1845. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2,     sample_fmts_s16,  adpcm_sbpro_2,     "ADPCM Sound Blaster Pro 2-bit");

  1846. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3,     sample_fmts_s16,  adpcm_sbpro_3,     "ADPCM Sound Blaster Pro 2.6-bit");

  1847. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4,     sample_fmts_s16,  adpcm_sbpro_4,     "ADPCM Sound Blaster Pro 4-bit");

  1848. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF,         sample_fmts_s16,  adpcm_swf,         "ADPCM Shockwave Flash");

  1849. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP_LE,      sample_fmts_s16p, adpcm_thp_le,      "ADPCM Nintendo THP (little-endian)");

  1850. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP,         sample_fmts_s16p, adpcm_thp,         "ADPCM Nintendo THP");

  1851. ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA,          sample_fmts_s16p, adpcm_xa,          "ADPCM CDROM XA");

  1852. ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA,      sample_fmts_s16,  adpcm_yamaha,      "ADPCM Yamaha");