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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_PSX:

  111.         max_channels = 8;

  112.         break;

  113.     case AV_CODEC_ID_ADPCM_IMA_DAT4:

  114.     case AV_CODEC_ID_ADPCM_THP:

  115.     case AV_CODEC_ID_ADPCM_THP_LE:

  116.         max_channels = 14;

  117.         break;

  118.     }

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

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

  121.         return AVERROR(EINVAL);

  122.     }

  123. 

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

  125.     case AV_CODEC_ID_ADPCM_CT:

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

  127.         break;

  128.     case AV_CODEC_ID_ADPCM_IMA_WAV:

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

  130.             return AVERROR_INVALIDDATA;

  131.         break;

  132.     case AV_CODEC_ID_ADPCM_IMA_APC:

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

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

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

  136.         }

  137.         break;

  138.     case AV_CODEC_ID_ADPCM_IMA_WS:

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

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

  141.         break;

  142.     default:

  143.         break;

  144.     }

  145. 

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

  147.         case AV_CODEC_ID_ADPCM_AICA:

  148.         case AV_CODEC_ID_ADPCM_IMA_DAT4:

  149.         case AV_CODEC_ID_ADPCM_IMA_QT:

  150.         case AV_CODEC_ID_ADPCM_IMA_WAV:

  151.         case AV_CODEC_ID_ADPCM_4XM:

  152.         case AV_CODEC_ID_ADPCM_XA:

  153.         case AV_CODEC_ID_ADPCM_EA_R1:

  154.         case AV_CODEC_ID_ADPCM_EA_R2:

  155.         case AV_CODEC_ID_ADPCM_EA_R3:

  156.         case AV_CODEC_ID_ADPCM_EA_XAS:

  157.         case AV_CODEC_ID_ADPCM_THP:

  158.         case AV_CODEC_ID_ADPCM_THP_LE:

  159.         case AV_CODEC_ID_ADPCM_AFC:

  160.         case AV_CODEC_ID_ADPCM_DTK:

  161.         case AV_CODEC_ID_ADPCM_PSX:

  162.             avctx->sample_fmt = AV_SAMPLE_FMT_S16P;

  163.             break;

  164.         case AV_CODEC_ID_ADPCM_IMA_WS:

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

  166.                                                       AV_SAMPLE_FMT_S16;

  167.             break;

  168.         default:

  169.             avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  170.     }

  171. 

  172.     return 0;

  173. }

  174. 

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

  176. {

  177.     int step_index;

  178.     int predictor;

  179.     int sign, delta, diff, step;

  180. 

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

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

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

  184. 

  185.     sign = nibble & 8;

  186.     delta = nibble & 7;

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

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

  189.      * quickly enough */

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

  191.     predictor = c->predictor;

  192.     if (sign) predictor -= diff;

  193.     else predictor += diff;

  194. 

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

  196.     c->step_index = step_index;

  197. 

  198.     return (int16_t)c->predictor;

  199. }

  200. 

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

  202. {

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

  204. 

  205.     shift = bps - 1;

  206.     nibble = get_bits_le(gb, bps),

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

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

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

  210. 

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

  212.     delta = av_mod_uintp2(nibble, shift);

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

  214.     predictor = c->predictor;

  215.     if (sign) predictor -= diff;

  216.     else predictor += diff;

  217. 

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

  219.     c->step_index = step_index;

  220. 

  221.     return (int16_t)c->predictor;

  222. }

  223. 

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

  225. {

  226.     int step_index;

  227.     int predictor;

  228.     int diff, step;

  229. 

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

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

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

  233. 

  234.     diff = step >> 3;

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

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

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

  238. 

  239.     if (nibble & 8)

  240.         predictor = c->predictor - diff;

  241.     else

  242.         predictor = c->predictor + diff;

  243. 

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

  245.     c->step_index = step_index;

  246. 

  247.     return c->predictor;

  248. }

  249. 

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

  251. {

  252.     int predictor;

  253. 

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

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

  256. 

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

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

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

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

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

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

  263.         c->idelta = INT_MAX/768;

  264.     }

  265. 

  266.     return c->sample1;

  267. }

  268. 

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

  270. {

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

  272. 

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

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

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

  276. 

  277.     sign = nibble & 8;

  278.     delta = nibble & 7;

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

  280.     predictor = c->predictor;

  281.     if (sign) predictor -= diff;

  282.     else predictor += diff;

  283. 

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

  285.     c->step_index = step_index;

  286. 

  287.     return c->predictor << 4;

  288. }

  289. 

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

  291. {

  292.     int sign, delta, diff;

  293.     int new_step;

  294. 

  295.     sign = nibble & 8;

  296.     delta = nibble & 7;

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

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

  299.      * quickly enough */

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

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

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

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

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

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

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

  307. 

  308.     return (int16_t)c->predictor;

  309. }

  310. 

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

  312. {

  313.     int sign, delta, diff;

  314. 

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

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

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

  318. 

  319.     /* clamp result */

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

  321. 

  322.     /* calculate new step */

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

  324.         c->step++;

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

  326.         c->step--;

  327. 

  328.     return (int16_t) c->predictor;

  329. }

  330. 

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

  332. {

  333.     if(!c->step) {

  334.         c->predictor = 0;

  335.         c->step = 127;

  336.     }

  337. 

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

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

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

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

  342.     return c->predictor;

  343. }

  344. 

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

  346.                      const uint8_t *in, ADPCMChannelStatus *left,

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

  348. {

  349.     int i, j;

  350.     int shift,filter,f0,f1;

  351.     int s_1,s_2;

  352.     int d,s,t;

  353. 

  354.     out0 += sample_offset;

  355.     if (channels == 1)

  356.         out1 = out0 + 28;

  357.     else

  358.         out1 += sample_offset;

  359. 

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

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

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

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

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

  365.             filter=0;

  366.         }

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

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

  369. 

  370.         s_1 = left->sample1;

  371.         s_2 = left->sample2;

  372. 

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

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

  375. 

  376.             t = sign_extend(d, 4);

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

  378.             s_2 = s_1;

  379.             s_1 = av_clip_int16(s);

  380.             out0[j] = s_1;

  381.         }

  382. 

  383.         if (channels == 2) {

  384.             left->sample1 = s_1;

  385.             left->sample2 = s_2;

  386.             s_1 = right->sample1;

  387.             s_2 = right->sample2;

  388.         }

  389. 

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

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

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

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

  394.             filter=0;

  395.         }

  396. 

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

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

  399. 

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

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

  402. 

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

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

  405.             s_2 = s_1;

  406.             s_1 = av_clip_int16(s);

  407.             out1[j] = s_1;

  408.         }

  409. 

  410.         if (channels == 2) {

  411.             right->sample1 = s_1;

  412.             right->sample2 = s_2;

  413.         } else {

  414.             left->sample1 = s_1;

  415.             left->sample2 = s_2;

  416.         }

  417. 

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

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

  420.     }

  421. 

  422.     return 0;

  423. }

  424. 

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

  426. {

  427.     ADPCMDecodeContext *c = avctx->priv_data;

  428.     GetBitContext gb;

  429.     const int *table;

  430.     int k0, signmask, nb_bits, count;

  431.     int size = buf_size*8;

  432.     int i;

  433. 

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

  435. 

  436.     //read bits & initial values

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

  438.     table = swf_index_tables[nb_bits-2];

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

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

  441. 

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

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

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

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

  446.         }

  447. 

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

  449.             int i;

  450. 

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

  452.                 // similar to IMA adpcm

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

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

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

  456.                 int k = k0;

  457. 

  458.                 do {

  459.                     if (delta & k)

  460.                         vpdiff += step;

  461.                     step >>= 1;

  462.                     k >>= 1;

  463.                 } while(k);

  464.                 vpdiff += step;

  465. 

  466.                 if (delta & signmask)

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

  468.                 else

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

  470. 

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

  472. 

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

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

  475. 

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

  477.             }

  478.         }

  479.     }

  480. }

  481. 

  482. /**

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

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

  485.  * decode with the given buf_size.

  486.  *

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

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

  489.  *                           number of samples in each frame.

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

  491.  *                               returned is an approximation.

  492.  */

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

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

  495. {

  496.     ADPCMDecodeContext *s = avctx->priv_data;

  497.     int nb_samples        = 0;

  498.     int ch                = avctx->channels;

  499.     int has_coded_samples = 0;

  500.     int header_size;

  501. 

  502.     *coded_samples = 0;

  503.     *approx_nb_samples = 0;

  504. 

  505.     if(ch <= 0)

  506.         return 0;

  507. 

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

  509.     /* constant, only check buf_size */

  510.     case AV_CODEC_ID_ADPCM_EA_XAS:

  511.         if (buf_size < 76 * ch)

  512.             return 0;

  513.         nb_samples = 128;

  514.         break;

  515.     case AV_CODEC_ID_ADPCM_IMA_QT:

  516.         if (buf_size < 34 * ch)

  517.             return 0;

  518.         nb_samples = 64;

  519.         break;

  520.     /* simple 4-bit adpcm */

  521.     case AV_CODEC_ID_ADPCM_CT:

  522.     case AV_CODEC_ID_ADPCM_IMA_APC:

  523.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  524.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  525.     case AV_CODEC_ID_ADPCM_IMA_WS:

  526.     case AV_CODEC_ID_ADPCM_YAMAHA:

  527.     case AV_CODEC_ID_ADPCM_AICA:

  528.         nb_samples = buf_size * 2 / ch;

  529.         break;

  530.     }

  531.     if (nb_samples)

  532.         return nb_samples;

  533. 

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

  535.     header_size = 0;

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

  537.         case AV_CODEC_ID_ADPCM_4XM:

  538.         case AV_CODEC_ID_ADPCM_IMA_DAT4:

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

  540.         case AV_CODEC_ID_ADPCM_IMA_AMV:     header_size = 8;           break;

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

  542.     }

  543.     if (header_size > 0)

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

  545. 

  546.     /* more complex formats */

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

  548.     case AV_CODEC_ID_ADPCM_EA:

  549.         has_coded_samples = 1;

  550.         *coded_samples  = bytestream2_get_le32(gb);

  551.         *coded_samples -= *coded_samples % 28;

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

  553.         break;

  554.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  555.         has_coded_samples = 1;

  556.         *coded_samples = bytestream2_get_le32(gb);

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

  558.         break;

  559.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

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

  561.         break;

  562.     case AV_CODEC_ID_ADPCM_EA_R1:

  563.     case AV_CODEC_ID_ADPCM_EA_R2:

  564.     case AV_CODEC_ID_ADPCM_EA_R3:

  565.         /* maximum number of samples */

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

  567.         has_coded_samples = 1;

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

  569.         case AV_CODEC_ID_ADPCM_EA_R1:

  570.             header_size    = 4 + 9 * ch;

  571.             *coded_samples = bytestream2_get_le32(gb);

  572.             break;

  573.         case AV_CODEC_ID_ADPCM_EA_R2:

  574.             header_size    = 4 + 5 * ch;

  575.             *coded_samples = bytestream2_get_le32(gb);

  576.             break;

  577.         case AV_CODEC_ID_ADPCM_EA_R3:

  578.             header_size    = 4 + 5 * ch;

  579.             *coded_samples = bytestream2_get_be32(gb);

  580.             break;

  581.         }

  582.         *coded_samples -= *coded_samples % 28;

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

  584.         nb_samples     -= nb_samples % 28;

  585.         *approx_nb_samples = 1;

  586.         break;

  587.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  588.         if (avctx->block_align > 0)

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

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

  591.         break;

  592.     case AV_CODEC_ID_ADPCM_IMA_DK4:

  593.         if (avctx->block_align > 0)

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

  595.         if (buf_size < 4 * ch)

  596.             return AVERROR_INVALIDDATA;

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

  598.         break;

  599.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  600.         if (avctx->block_align > 0)

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

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

  603.         break;

  604.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  605.     {

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

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

  608.         if (avctx->block_align > 0)

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

  610.         if (buf_size < 4 * ch)

  611.             return AVERROR_INVALIDDATA;

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

  613.         break;

  614.     }

  615.     case AV_CODEC_ID_ADPCM_MS:

  616.         if (avctx->block_align > 0)

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

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

  619.         break;

  620.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  621.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  622.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  623.     {

  624.         int samples_per_byte;

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

  626.         case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;

  627.         case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;

  628.         case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;

  629.         }

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

  631.             if (buf_size < ch)

  632.                 return AVERROR_INVALIDDATA;

  633.             nb_samples++;

  634.             buf_size -= ch;

  635.         }

  636.         nb_samples += buf_size * samples_per_byte / ch;

  637.         break;

  638.     }

  639.     case AV_CODEC_ID_ADPCM_SWF:

  640.     {

  641.         int buf_bits       = buf_size * 8 - 2;

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

  643.         int block_hdr_size = 22 * ch;

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

  645.         int nblocks        = buf_bits / block_size;

  646.         int bits_left      = buf_bits - nblocks * block_size;

  647.         nb_samples         = nblocks * 4096;

  648.         if (bits_left >= block_hdr_size)

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

  650.         break;

  651.     }

  652.     case AV_CODEC_ID_ADPCM_THP:

  653.     case AV_CODEC_ID_ADPCM_THP_LE:

  654.         if (avctx->extradata) {

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

  656.             break;

  657.         }

  658.         has_coded_samples = 1;

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

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

  661.                           bytestream2_get_le32(gb) :

  662.                           bytestream2_get_be32(gb);

  663.         buf_size       -= 8 + 36 * ch;

  664.         buf_size       /= ch;

  665.         nb_samples      = buf_size / 8 * 14;

  666.         if (buf_size % 8 > 1)

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

  668.         *approx_nb_samples = 1;

  669.         break;

  670.     case AV_CODEC_ID_ADPCM_AFC:

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

  672.         break;

  673.     case AV_CODEC_ID_ADPCM_XA:

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

  675.         break;

  676.     case AV_CODEC_ID_ADPCM_DTK:

  677.     case AV_CODEC_ID_ADPCM_PSX:

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

  679.         break;

  680.     }

  681. 

  682.     /* validate coded sample count */

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

  684.         return AVERROR_INVALIDDATA;

  685. 

  686.     return nb_samples;

  687. }

  688. 

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

  690.                               int *got_frame_ptr, AVPacket *avpkt)

  691. {

  692.     AVFrame *frame     = data;

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

  694.     int buf_size = avpkt->size;

  695.     ADPCMDecodeContext *c = avctx->priv_data;

  696.     ADPCMChannelStatus *cs;

  697.     int n, m, channel, i;

  698.     int16_t *samples;

  699.     int16_t **samples_p;

  700.     int st; /* stereo */

  701.     int count1, count2;

  702.     int nb_samples, coded_samples, approx_nb_samples, ret;

  703.     GetByteContext gb;

  704. 

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

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

  707.     if (nb_samples <= 0) {

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

  709.         return AVERROR_INVALIDDATA;

  710.     }

  711. 

  712.     /* get output buffer */

  713.     frame->nb_samples = nb_samples;

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

  715.         return ret;

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

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

  718. 

  719.     /* use coded_samples when applicable */

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

  721.     if (coded_samples) {

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

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

  724.         frame->nb_samples = nb_samples = coded_samples;

  725.     }

  726. 

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

  728. 

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

  730.     case AV_CODEC_ID_ADPCM_IMA_QT:

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

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

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

  734.             int predictor;

  735.             int step_index;

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

  737.             /* (pppppp) (piiiiiii) */

  738. 

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

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

  741.             step_index = predictor & 0x7F;

  742.             predictor &= ~0x7F;

  743. 

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

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

  746.                 if (diff < 0)

  747.                     diff = - diff;

  748.                 if (diff > 0x7f)

  749.                     goto update;

  750.             } else {

  751.             update:

  752.                 cs->step_index = step_index;

  753.                 cs->predictor = predictor;

  754.             }

  755. 

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

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

  758.                        channel, cs->step_index);

  759.                 return AVERROR_INVALIDDATA;

  760.             }

  761. 

  762.             samples = samples_p[channel];

  763. 

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

  765.                 int byte = bytestream2_get_byteu(&gb);

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

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

  768.             }

  769.         }

  770.         break;

  771.     case AV_CODEC_ID_ADPCM_IMA_WAV:

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

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

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

  775. 

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

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

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

  779.                        i, cs->step_index);

  780.                 return AVERROR_INVALIDDATA;

  781.             }

  782.         }

  783. 

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

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

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

  787.             uint8_t temp[20] = { 0 };

  788.             GetBitContext g;

  789. 

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

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

  792.                     int j;

  793. 

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

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

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

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

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

  799.                     }

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

  801.                     if (ret < 0)

  802.                         return ret;

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

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

  805.                                           avctx->bits_per_coded_sample);

  806.                     }

  807.                 }

  808.             }

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

  810.         } else {

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

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

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

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

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

  816.                     int v = bytestream2_get_byteu(&gb);

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

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

  819.                 }

  820.             }

  821.         }

  822.         }

  823.         break;

  824.     case AV_CODEC_ID_ADPCM_4XM:

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

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

  827. 

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

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

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

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

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

  833.                 return AVERROR_INVALIDDATA;

  834.             }

  835.         }

  836. 

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

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

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

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

  841.                 int v = bytestream2_get_byteu(&gb);

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

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

  844.             }

  845.         }

  846.         break;

  847.     case AV_CODEC_ID_ADPCM_MS:

  848.     {

  849.         int block_predictor;

  850. 

  851.         block_predictor = bytestream2_get_byteu(&gb);

  852.         if (block_predictor > 6) {

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

  854.                    block_predictor);

  855.             return AVERROR_INVALIDDATA;

  856.         }

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

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

  859.         if (st) {

  860.             block_predictor = bytestream2_get_byteu(&gb);

  861.             if (block_predictor > 6) {

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

  863.                        block_predictor);

  864.                 return AVERROR_INVALIDDATA;

  865.             }

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

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

  868.         }

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

  870.         if (st){

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

  872.         }

  873. 

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

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

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

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

  878. 

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

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

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

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

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

  884.             int byte = bytestream2_get_byteu(&gb);

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

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

  887.         }

  888.         break;

  889.     }

  890.     case AV_CODEC_ID_ADPCM_IMA_DK4:

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

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

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

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

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

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

  897.                        channel, cs->step_index);

  898.                 return AVERROR_INVALIDDATA;

  899.             }

  900.         }

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

  902.             int v = bytestream2_get_byteu(&gb);

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

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

  905.         }

  906.         break;

  907.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  908.     {

  909.         int last_byte = 0;

  910.         int nibble;

  911.         int decode_top_nibble_next = 0;

  912.         int diff_channel;

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

  914. 

  915.         bytestream2_skipu(&gb, 10);

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

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

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

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

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

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

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

  923.             return AVERROR_INVALIDDATA;

  924.         }

  925.         /* sign extend the predictors */

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

  927. 

  928.         /* DK3 ADPCM support macro */

  929. #define DK3_GET_NEXT_NIBBLE() \

  930.     if (decode_top_nibble_next) { \

  931.         nibble = last_byte >> 4; \

  932.         decode_top_nibble_next = 0; \

  933.     } else { \

  934.         last_byte = bytestream2_get_byteu(&gb); \

  935.         nibble = last_byte & 0x0F; \

  936.         decode_top_nibble_next = 1; \

  937.     }

  938. 

  939.         while (samples < samples_end) {

  940. 

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

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

  943. 

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

  945.             DK3_GET_NEXT_NIBBLE();

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

  947. 

  948.             /* process the diff channel predictor */

  949.             DK3_GET_NEXT_NIBBLE();

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

  951. 

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

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

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

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

  956. 

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

  958.             DK3_GET_NEXT_NIBBLE();

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

  960. 

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

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

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

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

  965.         }

  966. 

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

  968.             bytestream2_skip(&gb, 1);

  969.         break;

  970.     }

  971.     case AV_CODEC_ID_ADPCM_IMA_ISS:

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

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

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

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

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

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

  978.                        channel, cs->step_index);

  979.                 return AVERROR_INVALIDDATA;

  980.             }

  981.         }

  982. 

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

  984.             int v1, v2;

  985.             int v = bytestream2_get_byteu(&gb);

  986.             /* nibbles are swapped for mono */

  987.             if (st) {

  988.                 v1 = v >> 4;

  989.                 v2 = v & 0x0F;

  990.             } else {

  991.                 v2 = v >> 4;

  992.                 v1 = v & 0x0F;

  993.             }

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

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

  996.         }

  997.         break;

  998.     case AV_CODEC_ID_ADPCM_IMA_DAT4:

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

  1000.             cs = &c->status[channel];

  1001.             samples = samples_p[channel];

  1002.             bytestream2_skip(&gb, 4);

  1003.             for (n = 0; n < nb_samples; n += 2) {

  1004.                 int v = bytestream2_get_byteu(&gb);

  1005.                 *samples++ = adpcm_ima_expand_nibble(cs, v >> 4  , 3);

  1006.                 *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);

  1007.             }

  1008.         }

  1009.         break;

  1010.     case AV_CODEC_ID_ADPCM_IMA_APC:

  1011.         while (bytestream2_get_bytes_left(&gb) > 0) {

  1012.             int v = bytestream2_get_byteu(&gb);

  1013.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  v >> 4  , 3);

  1014.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

  1015.         }

  1016.         break;

  1017.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  1018.         while (bytestream2_get_bytes_left(&gb) > 0) {

  1019.             int v = bytestream2_get_byteu(&gb);

  1020.             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[0],  v >> 4  );

  1021.             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[st], v & 0x0F);

  1022.         }

  1023.         break;

  1024.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  1025.         for (channel = 0; channel < avctx->channels; channel++) {

  1026.             cs = &c->status[channel];

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

  1028.             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1029.             if (cs->step_index > 88u){

  1030.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1031.                        channel, cs->step_index);

  1032.                 return AVERROR_INVALIDDATA;

  1033.             }

  1034.         }

  1035.         for (n = 0; n < nb_samples / 2; n++) {

  1036.             int byte[2];

  1037. 

  1038.             byte[0] = bytestream2_get_byteu(&gb);

  1039.             if (st)

  1040.                 byte[1] = bytestream2_get_byteu(&gb);

  1041.             for(channel = 0; channel < avctx->channels; channel++) {

  1042.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] & 0x0F, 3);

  1043.             }

  1044.             for(channel = 0; channel < avctx->channels; channel++) {

  1045.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] >> 4  , 3);

  1046.             }

  1047.         }

  1048.         break;

  1049.     case AV_CODEC_ID_ADPCM_IMA_WS:

  1050.         if (c->vqa_version == 3) {

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

  1052.                 int16_t *smp = samples_p[channel];

  1053. 

  1054.                 for (n = nb_samples / 2; n > 0; n--) {

  1055.                     int v = bytestream2_get_byteu(&gb);

  1056.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1057.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1058.                 }

  1059.             }

  1060.         } else {

  1061.             for (n = nb_samples / 2; n > 0; n--) {

  1062.                 for (channel = 0; channel < avctx->channels; channel++) {

  1063.                     int v = bytestream2_get_byteu(&gb);

  1064.                     *samples++  = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1065.                     samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1066.                 }

  1067.                 samples += avctx->channels;

  1068.             }

  1069.         }

  1070.         bytestream2_seek(&gb, 0, SEEK_END);

  1071.         break;

  1072.     case AV_CODEC_ID_ADPCM_XA:

  1073.     {

  1074.         int16_t *out0 = samples_p[0];

  1075.         int16_t *out1 = samples_p[1];

  1076.         int samples_per_block = 28 * (3 - avctx->channels) * 4;

  1077.         int sample_offset = 0;

  1078.         while (bytestream2_get_bytes_left(&gb) >= 128) {

  1079.             if ((ret = xa_decode(avctx, out0, out1, buf + bytestream2_tell(&gb),

  1080.                                  &c->status[0], &c->status[1],

  1081.                                  avctx->channels, sample_offset)) < 0)

  1082.                 return ret;

  1083.             bytestream2_skipu(&gb, 128);

  1084.             sample_offset += samples_per_block;

  1085.         }

  1086.         break;

  1087.     }

  1088.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  1089.         for (i=0; i<=st; i++) {

  1090.             c->status[i].step_index = bytestream2_get_le32u(&gb);

  1091.             if (c->status[i].step_index > 88u) {

  1092.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1093.                        i, c->status[i].step_index);

  1094.                 return AVERROR_INVALIDDATA;

  1095.             }

  1096.         }

  1097.         for (i=0; i<=st; i++)

  1098.             c->status[i].predictor  = bytestream2_get_le32u(&gb);

  1099. 

  1100.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1101.             int byte   = bytestream2_get_byteu(&gb);

  1102.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   3);

  1103.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);

  1104.         }

  1105.         break;

  1106.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  1107.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1108.             int byte = bytestream2_get_byteu(&gb);

  1109.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   6);

  1110.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);

  1111.         }

  1112.         break;

  1113.     case AV_CODEC_ID_ADPCM_EA:

  1114.     {

  1115.         int previous_left_sample, previous_right_sample;

  1116.         int current_left_sample, current_right_sample;

  1117.         int next_left_sample, next_right_sample;

  1118.         int coeff1l, coeff2l, coeff1r, coeff2r;

  1119.         int shift_left, shift_right;

  1120. 

  1121.         /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,

  1122.            each coding 28 stereo samples. */

  1123. 

  1124.         if(avctx->channels != 2)

  1125.             return AVERROR_INVALIDDATA;

  1126. 

  1127.         current_left_sample   = sign_extend(bytestream2_get_le16u(&gb), 16);

  1128.         previous_left_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1129.         current_right_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1130.         previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

  1131. 

  1132.         for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1133.             int byte = bytestream2_get_byteu(&gb);

  1134.             coeff1l = ea_adpcm_table[ byte >> 4       ];

  1135.             coeff2l = ea_adpcm_table[(byte >> 4  ) + 4];

  1136.             coeff1r = ea_adpcm_table[ byte & 0x0F];

  1137.             coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];

  1138. 

  1139.             byte = bytestream2_get_byteu(&gb);

  1140.             shift_left  = 20 - (byte >> 4);

  1141.             shift_right = 20 - (byte & 0x0F);

  1142. 

  1143.             for (count2 = 0; count2 < 28; count2++) {

  1144.                 byte = bytestream2_get_byteu(&gb);

  1145.                 next_left_sample  = sign_extend(byte >> 4, 4) << shift_left;

  1146.                 next_right_sample = sign_extend(byte,      4) << shift_right;

  1147. 

  1148.                 next_left_sample = (next_left_sample +

  1149.                     (current_left_sample * coeff1l) +

  1150.                     (previous_left_sample * coeff2l) + 0x80) >> 8;

  1151.                 next_right_sample = (next_right_sample +

  1152.                     (current_right_sample * coeff1r) +

  1153.                     (previous_right_sample * coeff2r) + 0x80) >> 8;

  1154. 

  1155.                 previous_left_sample = current_left_sample;

  1156.                 current_left_sample = av_clip_int16(next_left_sample);

  1157.                 previous_right_sample = current_right_sample;

  1158.                 current_right_sample = av_clip_int16(next_right_sample);

  1159.                 *samples++ = current_left_sample;

  1160.                 *samples++ = current_right_sample;

  1161.             }

  1162.         }

  1163. 

  1164.         bytestream2_skip(&gb, 2); // Skip terminating 0x0000

  1165. 

  1166.         break;

  1167.     }

  1168.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

  1169.     {

  1170.         int coeff[2][2], shift[2];

  1171. 

  1172.         for(channel = 0; channel < avctx->channels; channel++) {

  1173.             int byte = bytestream2_get_byteu(&gb);

  1174.             for (i=0; i<2; i++)

  1175.                 coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];

  1176.             shift[channel] = 20 - (byte & 0x0F);

  1177.         }

  1178.         for (count1 = 0; count1 < nb_samples / 2; count1++) {

  1179.             int byte[2];

  1180. 

  1181.             byte[0] = bytestream2_get_byteu(&gb);

  1182.             if (st) byte[1] = bytestream2_get_byteu(&gb);

  1183.             for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */

  1184.                 for(channel = 0; channel < avctx->channels; channel++) {

  1185.                     int sample = sign_extend(byte[channel] >> i, 4) << shift[channel];

  1186.                     sample = (sample +

  1187.                              c->status[channel].sample1 * coeff[channel][0] +

  1188.                              c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;

  1189.                     c->status[channel].sample2 = c->status[channel].sample1;

  1190.                     c->status[channel].sample1 = av_clip_int16(sample);

  1191.                     *samples++ = c->status[channel].sample1;

  1192.                 }

  1193.             }

  1194.         }

  1195.         bytestream2_seek(&gb, 0, SEEK_END);

  1196.         break;

  1197.     }

  1198.     case AV_CODEC_ID_ADPCM_EA_R1:

  1199.     case AV_CODEC_ID_ADPCM_EA_R2:

  1200.     case AV_CODEC_ID_ADPCM_EA_R3: {

  1201.         /* channel numbering

  1202.            2chan: 0=fl, 1=fr

  1203.            4chan: 0=fl, 1=rl, 2=fr, 3=rr

  1204.            6chan: 0=fl, 1=c,  2=fr, 3=rl,  4=rr, 5=sub */

  1205.         const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;

  1206.         int previous_sample, current_sample, next_sample;

  1207.         int coeff1, coeff2;

  1208.         int shift;

  1209.         unsigned int channel;

  1210.         uint16_t *samplesC;

  1211.         int count = 0;

  1212.         int offsets[6];

  1213. 

  1214.         for (channel=0; channel<avctx->channels; channel++)

  1215.             offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :

  1216.                                              bytestream2_get_le32(&gb)) +

  1217.                                (avctx->channels + 1) * 4;

  1218. 

  1219.         for (channel=0; channel<avctx->channels; channel++) {

  1220.             bytestream2_seek(&gb, offsets[channel], SEEK_SET);

  1221.             samplesC = samples_p[channel];

  1222. 

  1223.             if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {

  1224.                 current_sample  = sign_extend(bytestream2_get_le16(&gb), 16);

  1225.                 previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);

  1226.             } else {

  1227.                 current_sample  = c->status[channel].predictor;

  1228.                 previous_sample = c->status[channel].prev_sample;

  1229.             }

  1230. 

  1231.             for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1232.                 int byte = bytestream2_get_byte(&gb);

  1233.                 if (byte == 0xEE) {  /* only seen in R2 and R3 */

  1234.                     current_sample  = sign_extend(bytestream2_get_be16(&gb), 16);

  1235.                     previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);

  1236. 

  1237.                     for (count2=0; count2<28; count2++)

  1238.                         *samplesC++ = sign_extend(bytestream2_get_be16(&gb), 16);

  1239.                 } else {

  1240.                     coeff1 = ea_adpcm_table[ byte >> 4     ];

  1241.                     coeff2 = ea_adpcm_table[(byte >> 4) + 4];

  1242.                     shift = 20 - (byte & 0x0F);

  1243. 

  1244.                     for (count2=0; count2<28; count2++) {

  1245.                         if (count2 & 1)

  1246.                             next_sample = sign_extend(byte,    4) << shift;

  1247.                         else {

  1248.                             byte = bytestream2_get_byte(&gb);

  1249.                             next_sample = sign_extend(byte >> 4, 4) << shift;

  1250.                         }

  1251. 

  1252.                         next_sample += (current_sample  * coeff1) +

  1253.                                        (previous_sample * coeff2);

  1254.                         next_sample = av_clip_int16(next_sample >> 8);

  1255. 

  1256.                         previous_sample = current_sample;

  1257.                         current_sample  = next_sample;

  1258.                         *samplesC++ = current_sample;

  1259.                     }

  1260.                 }

  1261.             }

  1262.             if (!count) {

  1263.                 count = count1;

  1264.             } else if (count != count1) {

  1265.                 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");

  1266.                 count = FFMAX(count, count1);

  1267.             }

  1268. 

  1269.             if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {

  1270.                 c->status[channel].predictor   = current_sample;

  1271.                 c->status[channel].prev_sample = previous_sample;

  1272.             }

  1273.         }

  1274. 

  1275.         frame->nb_samples = count * 28;

  1276.         bytestream2_seek(&gb, 0, SEEK_END);

  1277.         break;

  1278.     }

  1279.     case AV_CODEC_ID_ADPCM_EA_XAS:

  1280.         for (channel=0; channel<avctx->channels; channel++) {

  1281.             int coeff[2][4], shift[4];

  1282.             int16_t *s = samples_p[channel];

  1283.             for (n = 0; n < 4; n++, s += 32) {

  1284.                 int val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1285.                 for (i=0; i<2; i++)

  1286.                     coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];

  1287.                 s[0] = val & ~0x0F;

  1288. 

  1289.                 val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1290.                 shift[n] = 20 - (val & 0x0F);

  1291.                 s[1] = val & ~0x0F;

  1292.             }

  1293. 

  1294.             for (m=2; m<32; m+=2) {

  1295.                 s = &samples_p[channel][m];

  1296.                 for (n = 0; n < 4; n++, s += 32) {

  1297.                     int level, pred;

  1298.                     int byte = bytestream2_get_byteu(&gb);

  1299. 

  1300.                     level = sign_extend(byte >> 4, 4) << shift[n];

  1301.                     pred  = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];

  1302.                     s[0]  = av_clip_int16((level + pred + 0x80) >> 8);

  1303. 

  1304.                     level = sign_extend(byte, 4) << shift[n];

  1305.                     pred  = s[0] * coeff[0][n] + s[-1] * coeff[1][n];

  1306.                     s[1]  = av_clip_int16((level + pred + 0x80) >> 8);

  1307.                 }

  1308.             }

  1309.         }

  1310.         break;

  1311.     case AV_CODEC_ID_ADPCM_IMA_AMV:

  1312.         c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  1313.         c->status[0].step_index = bytestream2_get_byteu(&gb);

  1314.         bytestream2_skipu(&gb, 5);

  1315.         if (c->status[0].step_index > 88u) {

  1316.             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1317.                    c->status[0].step_index);

  1318.             return AVERROR_INVALIDDATA;

  1319.         }

  1320. 

  1321.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1322.             int v = bytestream2_get_byteu(&gb);

  1323. 

  1324.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);

  1325.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);

  1326.         }

  1327.         break;

  1328.     case AV_CODEC_ID_ADPCM_IMA_SMJPEG:

  1329.         for (i = 0; i < avctx->channels; i++) {

  1330.             c->status[i].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);

  1331.             c->status[i].step_index = bytestream2_get_byteu(&gb);

  1332.             bytestream2_skipu(&gb, 1);

  1333.             if (c->status[i].step_index > 88u) {

  1334.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1335.                        c->status[i].step_index);

  1336.                 return AVERROR_INVALIDDATA;

  1337.             }

  1338.         }

  1339. 

  1340.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1341.             int v = bytestream2_get_byteu(&gb);

  1342. 

  1343.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[0 ], v >> 4, 3);

  1344.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0xf, 3);

  1345.         }

  1346.         break;

  1347.     case AV_CODEC_ID_ADPCM_CT:

  1348.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1349.             int v = bytestream2_get_byteu(&gb);

  1350.             *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4  );

  1351.             *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);

  1352.         }

  1353.         break;

  1354.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  1355.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  1356.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  1357.         if (!c->status[0].step_index) {

  1358.             /* the first byte is a raw sample */

  1359.             *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1360.             if (st)

  1361.                 *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1362.             c->status[0].step_index = 1;

  1363.             nb_samples--;

  1364.         }

  1365.         if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {

  1366.             for (n = nb_samples >> (1 - st); n > 0; n--) {

  1367.                 int byte = bytestream2_get_byteu(&gb);

  1368.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1369.                                                        byte >> 4,   4, 0);

  1370.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1371.                                                        byte & 0x0F, 4, 0);

  1372.             }

  1373.         } else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {

  1374.             for (n = (nb_samples<<st) / 3; n > 0; n--) {

  1375.                 int byte = bytestream2_get_byteu(&gb);

  1376.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1377.                                                         byte >> 5        , 3, 0);

  1378.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1379.                                                        (byte >> 2) & 0x07, 3, 0);

  1380.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1381.                                                         byte & 0x03,       2, 0);

  1382.             }

  1383.         } else {

  1384.             for (n = nb_samples >> (2 - st); n > 0; n--) {

  1385.                 int byte = bytestream2_get_byteu(&gb);

  1386.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1387.                                                         byte >> 6        , 2, 2);

  1388.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1389.                                                        (byte >> 4) & 0x03, 2, 2);

  1390.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1391.                                                        (byte >> 2) & 0x03, 2, 2);

  1392.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1393.                                                         byte & 0x03,       2, 2);

  1394.             }

  1395.         }

  1396.         break;

  1397.     case AV_CODEC_ID_ADPCM_SWF:

  1398.         adpcm_swf_decode(avctx, buf, buf_size, samples);

  1399.         bytestream2_seek(&gb, 0, SEEK_END);

  1400.         break;

  1401.     case AV_CODEC_ID_ADPCM_YAMAHA:

  1402.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1403.             int v = bytestream2_get_byteu(&gb);

  1404.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);

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

  1406.         }

  1407.         break;

  1408.     case AV_CODEC_ID_ADPCM_AICA:

  1409.         if (!c->has_status) {

  1410.             for (channel = 0; channel < avctx->channels; channel++)

  1411.                 c->status[channel].step = 0;

  1412.             c->has_status = 1;

  1413.         }

  1414.         for (channel = 0; channel < avctx->channels; channel++) {

  1415.             samples = samples_p[channel];

  1416.             for (n = nb_samples >> 1; n > 0; n--) {

  1417.                 int v = bytestream2_get_byteu(&gb);

  1418.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v & 0x0F);

  1419.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v >> 4  );

  1420.             }

  1421.         }

  1422.         break;

  1423.     case AV_CODEC_ID_ADPCM_AFC:

  1424.     {

  1425.         int samples_per_block;

  1426.         int blocks;

  1427. 

  1428.         if (avctx->extradata && avctx->extradata_size == 1 && avctx->extradata[0]) {

  1429.             samples_per_block = avctx->extradata[0] / 16;

  1430.             blocks = nb_samples / avctx->extradata[0];

  1431.         } else {

  1432.             samples_per_block = nb_samples / 16;

  1433.             blocks = 1;

  1434.         }

  1435. 

  1436.         for (m = 0; m < blocks; m++) {

  1437.         for (channel = 0; channel < avctx->channels; channel++) {

  1438.             int prev1 = c->status[channel].sample1;

  1439.             int prev2 = c->status[channel].sample2;

  1440. 

  1441.             samples = samples_p[channel] + m * 16;

  1442.             /* Read in every sample for this channel.  */

  1443.             for (i = 0; i < samples_per_block; i++) {

  1444.                 int byte = bytestream2_get_byteu(&gb);

  1445.                 int scale = 1 << (byte >> 4);

  1446.                 int index = byte & 0xf;

  1447.                 int factor1 = ff_adpcm_afc_coeffs[0][index];

  1448.                 int factor2 = ff_adpcm_afc_coeffs[1][index];

  1449. 

  1450.                 /* Decode 16 samples.  */

  1451.                 for (n = 0; n < 16; n++) {

  1452.                     int32_t sampledat;

  1453. 

  1454.                     if (n & 1) {

  1455.                         sampledat = sign_extend(byte, 4);

  1456.                     } else {

  1457.                         byte = bytestream2_get_byteu(&gb);

  1458.                         sampledat = sign_extend(byte >> 4, 4);

  1459.                     }

  1460. 

  1461.                     sampledat = ((prev1 * factor1 + prev2 * factor2) +

  1462.                                  ((sampledat * scale) << 11)) >> 11;

  1463.                     *samples = av_clip_int16(sampledat);

  1464.                     prev2 = prev1;

  1465.                     prev1 = *samples++;

  1466.                 }

  1467.             }

  1468. 

  1469.             c->status[channel].sample1 = prev1;

  1470.             c->status[channel].sample2 = prev2;

  1471.         }

  1472.         }

  1473.         bytestream2_seek(&gb, 0, SEEK_END);

  1474.         break;

  1475.     }

  1476.     case AV_CODEC_ID_ADPCM_THP:

  1477.     case AV_CODEC_ID_ADPCM_THP_LE:

  1478.     {

  1479.         int table[14][16];

  1480.         int ch;

  1481. 

  1482. #define THP_GET16(g) \

  1483.     sign_extend( \

  1484.         avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE ? \

  1485.         bytestream2_get_le16u(&(g)) : \

  1486.         bytestream2_get_be16u(&(g)), 16)

  1487. 

  1488.         if (avctx->extradata) {

  1489.             GetByteContext tb;

  1490.             if (avctx->extradata_size < 32 * avctx->channels) {

  1491.                 av_log(avctx, AV_LOG_ERROR, "Missing coeff table\n");

  1492.                 return AVERROR_INVALIDDATA;

  1493.             }

  1494. 

  1495.             bytestream2_init(&tb, avctx->extradata, avctx->extradata_size);

  1496.             for (i = 0; i < avctx->channels; i++)

  1497.                 for (n = 0; n < 16; n++)

  1498.                     table[i][n] = THP_GET16(tb);

  1499.         } else {

  1500.             for (i = 0; i < avctx->channels; i++)

  1501.                 for (n = 0; n < 16; n++)

  1502.                     table[i][n] = THP_GET16(gb);

  1503. 

  1504.             if (!c->has_status) {

  1505.                 /* Initialize the previous sample.  */

  1506.                 for (i = 0; i < avctx->channels; i++) {

  1507.                     c->status[i].sample1 = THP_GET16(gb);

  1508.                     c->status[i].sample2 = THP_GET16(gb);

  1509.                 }

  1510.                 c->has_status = 1;

  1511.             } else {

  1512.                 bytestream2_skip(&gb, avctx->channels * 4);

  1513.             }

  1514.         }

  1515. 

  1516.         for (ch = 0; ch < avctx->channels; ch++) {

  1517.             samples = samples_p[ch];

  1518. 

  1519.             /* Read in every sample for this channel.  */

  1520.             for (i = 0; i < (nb_samples + 13) / 14; i++) {

  1521.                 int byte = bytestream2_get_byteu(&gb);

  1522.                 int index = (byte >> 4) & 7;

  1523.                 unsigned int exp = byte & 0x0F;

  1524.                 int factor1 = table[ch][index * 2];

  1525.                 int factor2 = table[ch][index * 2 + 1];

  1526. 

  1527.                 /* Decode 14 samples.  */

  1528.                 for (n = 0; n < 14 && (i * 14 + n < nb_samples); n++) {

  1529.                     int32_t sampledat;

  1530. 

  1531.                     if (n & 1) {

  1532.                         sampledat = sign_extend(byte, 4);

  1533.                     } else {

  1534.                         byte = bytestream2_get_byteu(&gb);

  1535.                         sampledat = sign_extend(byte >> 4, 4);

  1536.                     }

  1537. 

  1538.                     sampledat = ((c->status[ch].sample1 * factor1

  1539.                                 + c->status[ch].sample2 * factor2) >> 11) + (sampledat << exp);

  1540.                     *samples = av_clip_int16(sampledat);

  1541.                     c->status[ch].sample2 = c->status[ch].sample1;

  1542.                     c->status[ch].sample1 = *samples++;

  1543.                 }

  1544.             }

  1545.         }

  1546.         break;

  1547.     }

  1548.     case AV_CODEC_ID_ADPCM_DTK:

  1549.         for (channel = 0; channel < avctx->channels; channel++) {

  1550.             samples = samples_p[channel];

  1551. 

  1552.             /* Read in every sample for this channel.  */

  1553.             for (i = 0; i < nb_samples / 28; i++) {

  1554.                 int byte, header;

  1555.                 if (channel)

  1556.                     bytestream2_skipu(&gb, 1);

  1557.                 header = bytestream2_get_byteu(&gb);

  1558.                 bytestream2_skipu(&gb, 3 - channel);

  1559. 

  1560.                 /* Decode 28 samples.  */

  1561.                 for (n = 0; n < 28; n++) {

  1562.                     int32_t sampledat, prev;

  1563. 

  1564.                     switch (header >> 4) {

  1565.                     case 1:

  1566.                         prev = (c->status[channel].sample1 * 0x3c);

  1567.                         break;

  1568.                     case 2:

  1569.                         prev = (c->status[channel].sample1 * 0x73) - (c->status[channel].sample2 * 0x34);

  1570.                         break;

  1571.                     case 3:

  1572.                         prev = (c->status[channel].sample1 * 0x62) - (c->status[channel].sample2 * 0x37);

  1573.                         break;

  1574.                     default:

  1575.                         prev = 0;

  1576.                     }

  1577. 

  1578.                     prev = av_clip_intp2((prev + 0x20) >> 6, 21);

  1579. 

  1580.                     byte = bytestream2_get_byteu(&gb);

  1581.                     if (!channel)

  1582.                         sampledat = sign_extend(byte, 4);

  1583.                     else

  1584.                         sampledat = sign_extend(byte >> 4, 4);

  1585. 

  1586.                     sampledat = (((sampledat << 12) >> (header & 0xf)) << 6) + prev;

  1587.                     *samples++ = av_clip_int16(sampledat >> 6);

  1588.                     c->status[channel].sample2 = c->status[channel].sample1;

  1589.                     c->status[channel].sample1 = sampledat;

  1590.                 }

  1591.             }

  1592.             if (!channel)

  1593.                 bytestream2_seek(&gb, 0, SEEK_SET);

  1594.         }

  1595.         break;

  1596.     case AV_CODEC_ID_ADPCM_PSX:

  1597.         for (channel = 0; channel < avctx->channels; channel++) {

  1598.             samples = samples_p[channel];

  1599. 

  1600.             /* Read in every sample for this channel.  */

  1601.             for (i = 0; i < nb_samples / 28; i++) {

  1602.                 int filter, shift, flag, byte;

  1603. 

  1604.                 filter = bytestream2_get_byteu(&gb);

  1605.                 shift  = filter & 0xf;

  1606.                 filter = filter >> 4;

  1607.                 if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table))

  1608.                     return AVERROR_INVALIDDATA;

  1609.                 flag   = bytestream2_get_byteu(&gb);

  1610. 

  1611.                 /* Decode 28 samples.  */

  1612.                 for (n = 0; n < 28; n++) {

  1613.                     int sample = 0, scale;

  1614. 

  1615.                     if (flag < 0x07) {

  1616.                         if (n & 1) {

  1617.                             scale = sign_extend(byte >> 4, 4);

  1618.                         } else {

  1619.                             byte  = bytestream2_get_byteu(&gb);

  1620.                             scale = sign_extend(byte, 4);

  1621.                         }

  1622. 

  1623.                         scale  = scale << 12;

  1624.                         sample = (int)((scale >> shift) + (c->status[channel].sample1 * xa_adpcm_table[filter][0] + c->status[channel].sample2 * xa_adpcm_table[filter][1]) / 64);

  1625.                     }

  1626.                     *samples++ = av_clip_int16(sample);

  1627.                     c->status[channel].sample2 = c->status[channel].sample1;

  1628.                     c->status[channel].sample1 = sample;

  1629.                 }

  1630.             }

  1631.         }

  1632.         break;

  1633. 

  1634.     default:

  1635.         return -1;

  1636.     }

  1637. 

  1638.     if (avpkt->size && bytestream2_tell(&gb) == 0) {

  1639.         av_log(avctx, AV_LOG_ERROR, "Nothing consumed\n");

  1640.         return AVERROR_INVALIDDATA;

  1641.     }

  1642. 

  1643.     *got_frame_ptr = 1;

  1644. 

  1645.     if (avpkt->size < bytestream2_tell(&gb)) {

  1646.         av_log(avctx, AV_LOG_ERROR, "Overread of %d < %d\n", avpkt->size, bytestream2_tell(&gb));

  1647.         return avpkt->size;

  1648.     }

  1649. 

  1650.     return bytestream2_tell(&gb);

  1651. }

  1652. 

  1653. static void adpcm_flush(AVCodecContext *avctx)

  1654. {

  1655.     ADPCMDecodeContext *c = avctx->priv_data;

  1656.     c->has_status = 0;

  1657. }

  1658. 

  1659. 

  1660. static const enum AVSampleFormat sample_fmts_s16[]  = { AV_SAMPLE_FMT_S16,

  1661.                                                         AV_SAMPLE_FMT_NONE };

  1662. static const enum AVSampleFormat sample_fmts_s16p[] = { AV_SAMPLE_FMT_S16P,

  1663.                                                         AV_SAMPLE_FMT_NONE };

  1664. static const enum AVSampleFormat sample_fmts_both[] = { AV_SAMPLE_FMT_S16,

  1665.                                                         AV_SAMPLE_FMT_S16P,

  1666.                                                         AV_SAMPLE_FMT_NONE };

  1667. 

  1668. #define ADPCM_DECODER(id_, sample_fmts_, name_, long_name_) \

  1669. AVCodec ff_ ## name_ ## _decoder = {                        \

  1670.     .name           = #name_,                               \

  1671.     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \

  1672.     .type           = AVMEDIA_TYPE_AUDIO,                   \

  1673.     .id             = id_,                                  \

  1674.     .priv_data_size = sizeof(ADPCMDecodeContext),           \

  1675.     .init           = adpcm_decode_init,                    \

  1676.     .decode         = adpcm_decode_frame,                   \

  1677.     .flush          = adpcm_flush,                          \

  1678.     .capabilities   = AV_CODEC_CAP_DR1,                     \

  1679.     .sample_fmts    = sample_fmts_,                         \

  1680. }

  1681. 

  1682. /* Note: Do not forget to add new entries to the Makefile as well. */

  1683. ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM,         sample_fmts_s16p, adpcm_4xm,         "ADPCM 4X Movie");

  1684. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AFC,         sample_fmts_s16p, adpcm_afc,         "ADPCM Nintendo Gamecube AFC");

  1685. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AICA,        sample_fmts_s16p, adpcm_aica,        "ADPCM Yamaha AICA");

  1686. ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT,          sample_fmts_s16,  adpcm_ct,          "ADPCM Creative Technology");

  1687. ADPCM_DECODER(AV_CODEC_ID_ADPCM_DTK,         sample_fmts_s16p, adpcm_dtk,         "ADPCM Nintendo Gamecube DTK");

  1688. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA,          sample_fmts_s16,  adpcm_ea,          "ADPCM Electronic Arts");

  1689. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, sample_fmts_s16,  adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");

  1690. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1,       sample_fmts_s16p, adpcm_ea_r1,       "ADPCM Electronic Arts R1");

  1691. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2,       sample_fmts_s16p, adpcm_ea_r2,       "ADPCM Electronic Arts R2");

  1692. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3,       sample_fmts_s16p, adpcm_ea_r3,       "ADPCM Electronic Arts R3");

  1693. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS,      sample_fmts_s16p, adpcm_ea_xas,      "ADPCM Electronic Arts XAS");

  1694. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV,     sample_fmts_s16,  adpcm_ima_amv,     "ADPCM IMA AMV");

  1695. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC,     sample_fmts_s16,  adpcm_ima_apc,     "ADPCM IMA CRYO APC");

  1696. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DAT4,    sample_fmts_s16,  adpcm_ima_dat4,    "ADPCM IMA Eurocom DAT4");

  1697. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3,     sample_fmts_s16,  adpcm_ima_dk3,     "ADPCM IMA Duck DK3");

  1698. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4,     sample_fmts_s16,  adpcm_ima_dk4,     "ADPCM IMA Duck DK4");

  1699. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, sample_fmts_s16,  adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");

  1700. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, sample_fmts_s16,  adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");

  1701. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS,     sample_fmts_s16,  adpcm_ima_iss,     "ADPCM IMA Funcom ISS");

  1702. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI,     sample_fmts_s16,  adpcm_ima_oki,     "ADPCM IMA Dialogic OKI");

  1703. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT,      sample_fmts_s16p, adpcm_ima_qt,      "ADPCM IMA QuickTime");

  1704. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_RAD,     sample_fmts_s16,  adpcm_ima_rad,     "ADPCM IMA Radical");

  1705. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG,  sample_fmts_s16,  adpcm_ima_smjpeg,  "ADPCM IMA Loki SDL MJPEG");

  1706. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV,     sample_fmts_s16p, adpcm_ima_wav,     "ADPCM IMA WAV");

  1707. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS,      sample_fmts_both, adpcm_ima_ws,      "ADPCM IMA Westwood");

  1708. ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS,          sample_fmts_s16,  adpcm_ms,          "ADPCM Microsoft");

  1709. ADPCM_DECODER(AV_CODEC_ID_ADPCM_PSX,         sample_fmts_s16p, adpcm_psx,         "ADPCM Playstation");

  1710. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2,     sample_fmts_s16,  adpcm_sbpro_2,     "ADPCM Sound Blaster Pro 2-bit");

  1711. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3,     sample_fmts_s16,  adpcm_sbpro_3,     "ADPCM Sound Blaster Pro 2.6-bit");

  1712. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4,     sample_fmts_s16,  adpcm_sbpro_4,     "ADPCM Sound Blaster Pro 4-bit");

  1713. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF,         sample_fmts_s16,  adpcm_swf,         "ADPCM Shockwave Flash");

  1714. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP_LE,      sample_fmts_s16p, adpcm_thp_le,      "ADPCM Nintendo THP (little-endian)");

  1715. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP,         sample_fmts_s16p, adpcm_thp,         "ADPCM Nintendo THP");

  1716. ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA,          sample_fmts_s16p, adpcm_xa,          "ADPCM CDROM XA");

  1717. ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA,      sample_fmts_s16,  adpcm_yamaha,      "ADPCM Yamaha");