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FFmpeg/libavcodec/adpcm.c

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  1. /*

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

  3.  *

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

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

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

  7.  * CD-ROM XA ADPCM codec by BERO

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

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

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

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

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

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

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

  15.  *

  16.  * This file is part of FFmpeg.

  17.  *

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

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

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

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

  22.  *

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

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

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

  26.  * Lesser General Public License for more details.

  27.  *

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

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

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

  31.  */

  32. #include "avcodec.h"

  33. #include "get_bits.h"

  34. #include "bytestream.h"

  35. #include "adpcm.h"

  36. #include "adpcm_data.h"

  37. #include "internal.h"

  38. 

  39. /**

  40.  * @file

  41.  * ADPCM decoders

  42.  * Features and limitations:

  43.  *

  44.  * Reference documents:

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

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

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

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

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

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

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

  52.  *

  53.  * CD-ROM XA:

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

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

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

  57.  */

  58. 

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

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

  61.     {   0,   0 },

  62.     {  60,   0 },

  63.     { 115, -52 },

  64.     {  98, -55 },

  65.     { 122, -60 }

  66. };

  67. 

  68. static const int ea_adpcm_table[] = {

  69.     0,  240,  460,  392,

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

  71.     0,    1,    3,    4,

  72.     7,    8,   10,   11,

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

  74. };

  75. 

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

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

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

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

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

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

  82. };

  83. 

  84. /* end of tables */

  85. 

  86. typedef struct ADPCMDecodeContext {

  87.     ADPCMChannelStatus status[14];

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

  89.     int has_status;

  90. } ADPCMDecodeContext;

  91. 

  92. static av_cold int adpcm_decode_init(AVCodecContext * avctx)

  93. {

  94.     ADPCMDecodeContext *c = avctx->priv_data;

  95.     unsigned int min_channels = 1;

  96.     unsigned int max_channels = 2;

  97. 

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

  99.     case AV_CODEC_ID_ADPCM_DTK:

  100.     case AV_CODEC_ID_ADPCM_EA:

  101.         min_channels = 2;

  102.         break;

  103.     case AV_CODEC_ID_ADPCM_AFC:

  104.     case AV_CODEC_ID_ADPCM_EA_R1:

  105.     case AV_CODEC_ID_ADPCM_EA_R2:

  106.     case AV_CODEC_ID_ADPCM_EA_R3:

  107.     case AV_CODEC_ID_ADPCM_EA_XAS:

  108.         max_channels = 6;

  109.         break;

  110.     case AV_CODEC_ID_ADPCM_MTAF:

  111.         min_channels = 2;

  112.         max_channels = 8;

  113.         break;

  114.     case AV_CODEC_ID_ADPCM_PSX:

  115.         max_channels = 8;

  116.         break;

  117.     case AV_CODEC_ID_ADPCM_IMA_DAT4:

  118.     case AV_CODEC_ID_ADPCM_THP:

  119.     case AV_CODEC_ID_ADPCM_THP_LE:

  120.         max_channels = 14;

  121.         break;

  122.     }

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

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

  125.         return AVERROR(EINVAL);

  126.     }

  127. 

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

  129.     case AV_CODEC_ID_ADPCM_CT:

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

  131.         break;

  132.     case AV_CODEC_ID_ADPCM_IMA_WAV:

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

  134.             return AVERROR_INVALIDDATA;

  135.         break;

  136.     case AV_CODEC_ID_ADPCM_IMA_APC:

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

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

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

  140.         }

  141.         break;

  142.     case AV_CODEC_ID_ADPCM_IMA_WS:

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

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

  145.         break;

  146.     default:

  147.         break;

  148.     }

  149. 

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

  151.         case AV_CODEC_ID_ADPCM_AICA:

  152.         case AV_CODEC_ID_ADPCM_IMA_DAT4:

  153.         case AV_CODEC_ID_ADPCM_IMA_QT:

  154.         case AV_CODEC_ID_ADPCM_IMA_WAV:

  155.         case AV_CODEC_ID_ADPCM_4XM:

  156.         case AV_CODEC_ID_ADPCM_XA:

  157.         case AV_CODEC_ID_ADPCM_EA_R1:

  158.         case AV_CODEC_ID_ADPCM_EA_R2:

  159.         case AV_CODEC_ID_ADPCM_EA_R3:

  160.         case AV_CODEC_ID_ADPCM_EA_XAS:

  161.         case AV_CODEC_ID_ADPCM_THP:

  162.         case AV_CODEC_ID_ADPCM_THP_LE:

  163.         case AV_CODEC_ID_ADPCM_AFC:

  164.         case AV_CODEC_ID_ADPCM_DTK:

  165.         case AV_CODEC_ID_ADPCM_PSX:

  166.         case AV_CODEC_ID_ADPCM_MTAF:

  167.             avctx->sample_fmt = AV_SAMPLE_FMT_S16P;

  168.             break;

  169.         case AV_CODEC_ID_ADPCM_IMA_WS:

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

  171.                                                       AV_SAMPLE_FMT_S16;

  172.             break;

  173.         default:

  174.             avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  175.     }

  176. 

  177.     return 0;

  178. }

  179. 

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

  181. {

  182.     int step_index;

  183.     int predictor;

  184.     int sign, delta, diff, step;

  185. 

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

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

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

  189. 

  190.     sign = nibble & 8;

  191.     delta = nibble & 7;

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

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

  194.      * quickly enough */

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

  196.     predictor = c->predictor;

  197.     if (sign) predictor -= diff;

  198.     else predictor += diff;

  199. 

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

  201.     c->step_index = step_index;

  202. 

  203.     return (int16_t)c->predictor;

  204. }

  205. 

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

  207. {

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

  209. 

  210.     shift = bps - 1;

  211.     nibble = get_bits_le(gb, bps),

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

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

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

  215. 

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

  217.     delta = av_mod_uintp2(nibble, shift);

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

  219.     predictor = c->predictor;

  220.     if (sign) predictor -= diff;

  221.     else predictor += diff;

  222. 

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

  224.     c->step_index = step_index;

  225. 

  226.     return (int16_t)c->predictor;

  227. }

  228. 

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

  230. {

  231.     int step_index;

  232.     int predictor;

  233.     int diff, step;

  234. 

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

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

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

  238. 

  239.     diff = step >> 3;

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

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

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

  243. 

  244.     if (nibble & 8)

  245.         predictor = c->predictor - diff;

  246.     else

  247.         predictor = c->predictor + diff;

  248. 

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

  250.     c->step_index = step_index;

  251. 

  252.     return c->predictor;

  253. }

  254. 

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

  256. {

  257.     int predictor;

  258. 

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

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

  261. 

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

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

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

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

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

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

  268.         c->idelta = INT_MAX/768;

  269.     }

  270. 

  271.     return c->sample1;

  272. }

  273. 

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

  275. {

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

  277. 

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

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

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

  281. 

  282.     sign = nibble & 8;

  283.     delta = nibble & 7;

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

  285.     predictor = c->predictor;

  286.     if (sign) predictor -= diff;

  287.     else predictor += diff;

  288. 

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

  290.     c->step_index = step_index;

  291. 

  292.     return c->predictor << 4;

  293. }

  294. 

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

  296. {

  297.     int sign, delta, diff;

  298.     int new_step;

  299. 

  300.     sign = nibble & 8;

  301.     delta = nibble & 7;

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

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

  304.      * quickly enough */

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

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

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

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

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

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

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

  312. 

  313.     return (int16_t)c->predictor;

  314. }

  315. 

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

  317. {

  318.     int sign, delta, diff;

  319. 

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

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

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

  323. 

  324.     /* clamp result */

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

  326. 

  327.     /* calculate new step */

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

  329.         c->step++;

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

  331.         c->step--;

  332. 

  333.     return (int16_t) c->predictor;

  334. }

  335. 

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

  337. {

  338.     if(!c->step) {

  339.         c->predictor = 0;

  340.         c->step = 127;

  341.     }

  342. 

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

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

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

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

  347.     return c->predictor;

  348. }

  349. 

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

  351. {

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

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

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

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

  356.     return c->predictor;

  357. }

  358. 

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

  360.                      const uint8_t *in, ADPCMChannelStatus *left,

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

  362. {

  363.     int i, j;

  364.     int shift,filter,f0,f1;

  365.     int s_1,s_2;

  366.     int d,s,t;

  367. 

  368.     out0 += sample_offset;

  369.     if (channels == 1)

  370.         out1 = out0 + 28;

  371.     else

  372.         out1 += sample_offset;

  373. 

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

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

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

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

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

  379.             filter=0;

  380.         }

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

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

  383. 

  384.         s_1 = left->sample1;

  385.         s_2 = left->sample2;

  386. 

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

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

  389. 

  390.             t = sign_extend(d, 4);

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

  392.             s_2 = s_1;

  393.             s_1 = av_clip_int16(s);

  394.             out0[j] = s_1;

  395.         }

  396. 

  397.         if (channels == 2) {

  398.             left->sample1 = s_1;

  399.             left->sample2 = s_2;

  400.             s_1 = right->sample1;

  401.             s_2 = right->sample2;

  402.         }

  403. 

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

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

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

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

  408.             filter=0;

  409.         }

  410. 

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

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

  413. 

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

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

  416. 

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

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

  419.             s_2 = s_1;

  420.             s_1 = av_clip_int16(s);

  421.             out1[j] = s_1;

  422.         }

  423. 

  424.         if (channels == 2) {

  425.             right->sample1 = s_1;

  426.             right->sample2 = s_2;

  427.         } else {

  428.             left->sample1 = s_1;

  429.             left->sample2 = s_2;

  430.         }

  431. 

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

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

  434.     }

  435. 

  436.     return 0;

  437. }

  438. 

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

  440. {

  441.     ADPCMDecodeContext *c = avctx->priv_data;

  442.     GetBitContext gb;

  443.     const int *table;

  444.     int k0, signmask, nb_bits, count;

  445.     int size = buf_size*8;

  446.     int i;

  447. 

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

  449. 

  450.     //read bits & initial values

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

  452.     table = swf_index_tables[nb_bits-2];

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

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

  455. 

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

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

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

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

  460.         }

  461. 

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

  463.             int i;

  464. 

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

  466.                 // similar to IMA adpcm

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

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

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

  470.                 int k = k0;

  471. 

  472.                 do {

  473.                     if (delta & k)

  474.                         vpdiff += step;

  475.                     step >>= 1;

  476.                     k >>= 1;

  477.                 } while(k);

  478.                 vpdiff += step;

  479. 

  480.                 if (delta & signmask)

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

  482.                 else

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

  484. 

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

  486. 

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

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

  489. 

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

  491.             }

  492.         }

  493.     }

  494. }

  495. 

  496. /**

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

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

  499.  * decode with the given buf_size.

  500.  *

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

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

  503.  *                           number of samples in each frame.

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

  505.  *                               returned is an approximation.

  506.  */

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

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

  509. {

  510.     ADPCMDecodeContext *s = avctx->priv_data;

  511.     int nb_samples        = 0;

  512.     int ch                = avctx->channels;

  513.     int has_coded_samples = 0;

  514.     int header_size;

  515. 

  516.     *coded_samples = 0;

  517.     *approx_nb_samples = 0;

  518. 

  519.     if(ch <= 0)

  520.         return 0;

  521. 

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

  523.     /* constant, only check buf_size */

  524.     case AV_CODEC_ID_ADPCM_EA_XAS:

  525.         if (buf_size < 76 * ch)

  526.             return 0;

  527.         nb_samples = 128;

  528.         break;

  529.     case AV_CODEC_ID_ADPCM_IMA_QT:

  530.         if (buf_size < 34 * ch)

  531.             return 0;

  532.         nb_samples = 64;

  533.         break;

  534.     /* simple 4-bit adpcm */

  535.     case AV_CODEC_ID_ADPCM_CT:

  536.     case AV_CODEC_ID_ADPCM_IMA_APC:

  537.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  538.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  539.     case AV_CODEC_ID_ADPCM_IMA_WS:

  540.     case AV_CODEC_ID_ADPCM_YAMAHA:

  541.     case AV_CODEC_ID_ADPCM_AICA:

  542.         nb_samples = buf_size * 2 / ch;

  543.         break;

  544.     }

  545.     if (nb_samples)

  546.         return nb_samples;

  547. 

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

  549.     header_size = 0;

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

  551.         case AV_CODEC_ID_ADPCM_4XM:

  552.         case AV_CODEC_ID_ADPCM_IMA_DAT4:

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

  554.         case AV_CODEC_ID_ADPCM_IMA_AMV:     header_size = 8;           break;

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

  556.     }

  557.     if (header_size > 0)

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

  559. 

  560.     /* more complex formats */

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

  562.     case AV_CODEC_ID_ADPCM_EA:

  563.         has_coded_samples = 1;

  564.         *coded_samples  = bytestream2_get_le32(gb);

  565.         *coded_samples -= *coded_samples % 28;

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

  567.         break;

  568.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  569.         has_coded_samples = 1;

  570.         *coded_samples = bytestream2_get_le32(gb);

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

  572.         break;

  573.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

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

  575.         break;

  576.     case AV_CODEC_ID_ADPCM_EA_R1:

  577.     case AV_CODEC_ID_ADPCM_EA_R2:

  578.     case AV_CODEC_ID_ADPCM_EA_R3:

  579.         /* maximum number of samples */

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

  581.         has_coded_samples = 1;

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

  583.         case AV_CODEC_ID_ADPCM_EA_R1:

  584.             header_size    = 4 + 9 * ch;

  585.             *coded_samples = bytestream2_get_le32(gb);

  586.             break;

  587.         case AV_CODEC_ID_ADPCM_EA_R2:

  588.             header_size    = 4 + 5 * ch;

  589.             *coded_samples = bytestream2_get_le32(gb);

  590.             break;

  591.         case AV_CODEC_ID_ADPCM_EA_R3:

  592.             header_size    = 4 + 5 * ch;

  593.             *coded_samples = bytestream2_get_be32(gb);

  594.             break;

  595.         }

  596.         *coded_samples -= *coded_samples % 28;

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

  598.         nb_samples     -= nb_samples % 28;

  599.         *approx_nb_samples = 1;

  600.         break;

  601.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  602.         if (avctx->block_align > 0)

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

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

  605.         break;

  606.     case AV_CODEC_ID_ADPCM_IMA_DK4:

  607.         if (avctx->block_align > 0)

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

  609.         if (buf_size < 4 * ch)

  610.             return AVERROR_INVALIDDATA;

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

  612.         break;

  613.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  614.         if (avctx->block_align > 0)

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

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

  617.         break;

  618.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  619.     {

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

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

  622.         if (avctx->block_align > 0)

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

  624.         if (buf_size < 4 * ch)

  625.             return AVERROR_INVALIDDATA;

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

  627.         break;

  628.     }

  629.     case AV_CODEC_ID_ADPCM_MS:

  630.         if (avctx->block_align > 0)

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

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

  633.         break;

  634.     case AV_CODEC_ID_ADPCM_MTAF:

  635.         if (avctx->block_align > 0)

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

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

  638.         break;

  639.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  640.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  641.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  642.     {

  643.         int samples_per_byte;

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

  645.         case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;

  646.         case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;

  647.         case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;

  648.         }

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

  650.             if (buf_size < ch)

  651.                 return AVERROR_INVALIDDATA;

  652.             nb_samples++;

  653.             buf_size -= ch;

  654.         }

  655.         nb_samples += buf_size * samples_per_byte / ch;

  656.         break;

  657.     }

  658.     case AV_CODEC_ID_ADPCM_SWF:

  659.     {

  660.         int buf_bits       = buf_size * 8 - 2;

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

  662.         int block_hdr_size = 22 * ch;

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

  664.         int nblocks        = buf_bits / block_size;

  665.         int bits_left      = buf_bits - nblocks * block_size;

  666.         nb_samples         = nblocks * 4096;

  667.         if (bits_left >= block_hdr_size)

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

  669.         break;

  670.     }

  671.     case AV_CODEC_ID_ADPCM_THP:

  672.     case AV_CODEC_ID_ADPCM_THP_LE:

  673.         if (avctx->extradata) {

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

  675.             break;

  676.         }

  677.         has_coded_samples = 1;

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

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

  680.                           bytestream2_get_le32(gb) :

  681.                           bytestream2_get_be32(gb);

  682.         buf_size       -= 8 + 36 * ch;

  683.         buf_size       /= ch;

  684.         nb_samples      = buf_size / 8 * 14;

  685.         if (buf_size % 8 > 1)

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

  687.         *approx_nb_samples = 1;

  688.         break;

  689.     case AV_CODEC_ID_ADPCM_AFC:

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

  691.         break;

  692.     case AV_CODEC_ID_ADPCM_XA:

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

  694.         break;

  695.     case AV_CODEC_ID_ADPCM_DTK:

  696.     case AV_CODEC_ID_ADPCM_PSX:

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

  698.         break;

  699.     }

  700. 

  701.     /* validate coded sample count */

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

  703.         return AVERROR_INVALIDDATA;

  704. 

  705.     return nb_samples;

  706. }

  707. 

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

  709.                               int *got_frame_ptr, AVPacket *avpkt)

  710. {

  711.     AVFrame *frame     = data;

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

  713.     int buf_size = avpkt->size;

  714.     ADPCMDecodeContext *c = avctx->priv_data;

  715.     ADPCMChannelStatus *cs;

  716.     int n, m, channel, i;

  717.     int16_t *samples;

  718.     int16_t **samples_p;

  719.     int st; /* stereo */

  720.     int count1, count2;

  721.     int nb_samples, coded_samples, approx_nb_samples, ret;

  722.     GetByteContext gb;

  723. 

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

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

  726.     if (nb_samples <= 0) {

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

  728.         return AVERROR_INVALIDDATA;

  729.     }

  730. 

  731.     /* get output buffer */

  732.     frame->nb_samples = nb_samples;

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

  734.         return ret;

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

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

  737. 

  738.     /* use coded_samples when applicable */

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

  740.     if (coded_samples) {

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

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

  743.         frame->nb_samples = nb_samples = coded_samples;

  744.     }

  745. 

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

  747. 

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

  749.     case AV_CODEC_ID_ADPCM_IMA_QT:

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

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

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

  753.             int predictor;

  754.             int step_index;

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

  756.             /* (pppppp) (piiiiiii) */

  757. 

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

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

  760.             step_index = predictor & 0x7F;

  761.             predictor &= ~0x7F;

  762. 

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

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

  765.                 if (diff < 0)

  766.                     diff = - diff;

  767.                 if (diff > 0x7f)

  768.                     goto update;

  769.             } else {

  770.             update:

  771.                 cs->step_index = step_index;

  772.                 cs->predictor = predictor;

  773.             }

  774. 

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

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

  777.                        channel, cs->step_index);

  778.                 return AVERROR_INVALIDDATA;

  779.             }

  780. 

  781.             samples = samples_p[channel];

  782. 

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

  784.                 int byte = bytestream2_get_byteu(&gb);

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

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

  787.             }

  788.         }

  789.         break;

  790.     case AV_CODEC_ID_ADPCM_IMA_WAV:

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

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

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

  794. 

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

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

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

  798.                        i, cs->step_index);

  799.                 return AVERROR_INVALIDDATA;

  800.             }

  801.         }

  802. 

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

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

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

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

  807.             GetBitContext g;

  808. 

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

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

  811.                     int j;

  812. 

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

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

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

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

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

  818.                     }

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

  820.                     if (ret < 0)

  821.                         return ret;

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

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

  824.                                           avctx->bits_per_coded_sample);

  825.                     }

  826.                 }

  827.             }

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

  829.         } else {

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

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

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

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

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

  835.                     int v = bytestream2_get_byteu(&gb);

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

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

  838.                 }

  839.             }

  840.         }

  841.         }

  842.         break;

  843.     case AV_CODEC_ID_ADPCM_4XM:

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

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

  846. 

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

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

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

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

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

  852.                 return AVERROR_INVALIDDATA;

  853.             }

  854.         }

  855. 

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

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

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

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

  860.                 int v = bytestream2_get_byteu(&gb);

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

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

  863.             }

  864.         }

  865.         break;

  866.     case AV_CODEC_ID_ADPCM_MS:

  867.     {

  868.         int block_predictor;

  869. 

  870.         block_predictor = bytestream2_get_byteu(&gb);

  871.         if (block_predictor > 6) {

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

  873.                    block_predictor);

  874.             return AVERROR_INVALIDDATA;

  875.         }

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

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

  878.         if (st) {

  879.             block_predictor = bytestream2_get_byteu(&gb);

  880.             if (block_predictor > 6) {

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

  882.                        block_predictor);

  883.                 return AVERROR_INVALIDDATA;

  884.             }

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

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

  887.         }

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

  889.         if (st){

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

  891.         }

  892. 

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

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

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

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

  897. 

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

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

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

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

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

  903.             int byte = bytestream2_get_byteu(&gb);

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

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

  906.         }

  907.         break;

  908.     }

  909.     case AV_CODEC_ID_ADPCM_MTAF:

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

  911.             bytestream2_skipu(&gb, 4);

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

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

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

  915.             bytestream2_skipu(&gb, 2);

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

  917.             bytestream2_skipu(&gb, 2);

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

  919.                 int v = bytestream2_get_byteu(&gb);

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

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

  922.             }

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

  924.                 int v = bytestream2_get_byteu(&gb);

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

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

  927.             }

  928.         }

  929.         break;

  930.     case AV_CODEC_ID_ADPCM_IMA_DK4:

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

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

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

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

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

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

  937.                        channel, cs->step_index);

  938.                 return AVERROR_INVALIDDATA;

  939.             }

  940.         }

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

  942.             int v = bytestream2_get_byteu(&gb);

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

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

  945.         }

  946.         break;

  947.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  948.     {

  949.         int last_byte = 0;

  950.         int nibble;

  951.         int decode_top_nibble_next = 0;

  952.         int diff_channel;

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

  954. 

  955.         bytestream2_skipu(&gb, 10);

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

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

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

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

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

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

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

  963.             return AVERROR_INVALIDDATA;

  964.         }

  965.         /* sign extend the predictors */

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

  967. 

  968.         /* DK3 ADPCM support macro */

  969. #define DK3_GET_NEXT_NIBBLE() \

  970.     if (decode_top_nibble_next) { \

  971.         nibble = last_byte >> 4; \

  972.         decode_top_nibble_next = 0; \

  973.     } else { \

  974.         last_byte = bytestream2_get_byteu(&gb); \

  975.         nibble = last_byte & 0x0F; \

  976.         decode_top_nibble_next = 1; \

  977.     }

  978. 

  979.         while (samples < samples_end) {

  980. 

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

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

  983. 

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

  985.             DK3_GET_NEXT_NIBBLE();

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

  987. 

  988.             /* process the diff channel predictor */

  989.             DK3_GET_NEXT_NIBBLE();

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

  991. 

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

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

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

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

  996. 

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

  998.             DK3_GET_NEXT_NIBBLE();

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

  1000. 

  1001.             /* process the second pair of stereo PCM samples */

  1002.             diff_channel = (diff_channel + c->status[1].predictor) / 2;

  1003.             *samples++ = c->status[0].predictor + c->status[1].predictor;

  1004.             *samples++ = c->status[0].predictor - c->status[1].predictor;

  1005.         }

  1006. 

  1007.         if ((bytestream2_tell(&gb) & 1))

  1008.             bytestream2_skip(&gb, 1);

  1009.         break;

  1010.     }

  1011.     case AV_CODEC_ID_ADPCM_IMA_ISS:

  1012.         for (channel = 0; channel < avctx->channels; channel++) {

  1013.             cs = &c->status[channel];

  1014.             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1015.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1016.             if (cs->step_index > 88u){

  1017.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1018.                        channel, cs->step_index);

  1019.                 return AVERROR_INVALIDDATA;

  1020.             }

  1021.         }

  1022. 

  1023.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1024.             int v1, v2;

  1025.             int v = bytestream2_get_byteu(&gb);

  1026.             /* nibbles are swapped for mono */

  1027.             if (st) {

  1028.                 v1 = v >> 4;

  1029.                 v2 = v & 0x0F;

  1030.             } else {

  1031.                 v2 = v >> 4;

  1032.                 v1 = v & 0x0F;

  1033.             }

  1034.             *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);

  1035.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);

  1036.         }

  1037.         break;

  1038.     case AV_CODEC_ID_ADPCM_IMA_DAT4:

  1039.         for (channel = 0; channel < avctx->channels; channel++) {

  1040.             cs = &c->status[channel];

  1041.             samples = samples_p[channel];

  1042.             bytestream2_skip(&gb, 4);

  1043.             for (n = 0; n < nb_samples; n += 2) {

  1044.                 int v = bytestream2_get_byteu(&gb);

  1045.                 *samples++ = adpcm_ima_expand_nibble(cs, v >> 4  , 3);

  1046.                 *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);

  1047.             }

  1048.         }

  1049.         break;

  1050.     case AV_CODEC_ID_ADPCM_IMA_APC:

  1051.         while (bytestream2_get_bytes_left(&gb) > 0) {

  1052.             int v = bytestream2_get_byteu(&gb);

  1053.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  v >> 4  , 3);

  1054.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);

  1055.         }

  1056.         break;

  1057.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  1058.         while (bytestream2_get_bytes_left(&gb) > 0) {

  1059.             int v = bytestream2_get_byteu(&gb);

  1060.             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[0],  v >> 4  );

  1061.             *samples++ = adpcm_ima_oki_expand_nibble(&c->status[st], v & 0x0F);

  1062.         }

  1063.         break;

  1064.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  1065.         for (channel = 0; channel < avctx->channels; channel++) {

  1066.             cs = &c->status[channel];

  1067.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1068.             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1069.             if (cs->step_index > 88u){

  1070.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1071.                        channel, cs->step_index);

  1072.                 return AVERROR_INVALIDDATA;

  1073.             }

  1074.         }

  1075.         for (n = 0; n < nb_samples / 2; n++) {

  1076.             int byte[2];

  1077. 

  1078.             byte[0] = bytestream2_get_byteu(&gb);

  1079.             if (st)

  1080.                 byte[1] = bytestream2_get_byteu(&gb);

  1081.             for(channel = 0; channel < avctx->channels; channel++) {

  1082.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] & 0x0F, 3);

  1083.             }

  1084.             for(channel = 0; channel < avctx->channels; channel++) {

  1085.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] >> 4  , 3);

  1086.             }

  1087.         }

  1088.         break;

  1089.     case AV_CODEC_ID_ADPCM_IMA_WS:

  1090.         if (c->vqa_version == 3) {

  1091.             for (channel = 0; channel < avctx->channels; channel++) {

  1092.                 int16_t *smp = samples_p[channel];

  1093. 

  1094.                 for (n = nb_samples / 2; n > 0; n--) {

  1095.                     int v = bytestream2_get_byteu(&gb);

  1096.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1097.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1098.                 }

  1099.             }

  1100.         } else {

  1101.             for (n = nb_samples / 2; n > 0; n--) {

  1102.                 for (channel = 0; channel < avctx->channels; channel++) {

  1103.                     int v = bytestream2_get_byteu(&gb);

  1104.                     *samples++  = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1105.                     samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1106.                 }

  1107.                 samples += avctx->channels;

  1108.             }

  1109.         }

  1110.         bytestream2_seek(&gb, 0, SEEK_END);

  1111.         break;

  1112.     case AV_CODEC_ID_ADPCM_XA:

  1113.     {

  1114.         int16_t *out0 = samples_p[0];

  1115.         int16_t *out1 = samples_p[1];

  1116.         int samples_per_block = 28 * (3 - avctx->channels) * 4;

  1117.         int sample_offset = 0;

  1118.         while (bytestream2_get_bytes_left(&gb) >= 128) {

  1119.             if ((ret = xa_decode(avctx, out0, out1, buf + bytestream2_tell(&gb),

  1120.                                  &c->status[0], &c->status[1],

  1121.                                  avctx->channels, sample_offset)) < 0)

  1122.                 return ret;

  1123.             bytestream2_skipu(&gb, 128);

  1124.             sample_offset += samples_per_block;

  1125.         }

  1126.         break;

  1127.     }

  1128.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  1129.         for (i=0; i<=st; i++) {

  1130.             c->status[i].step_index = bytestream2_get_le32u(&gb);

  1131.             if (c->status[i].step_index > 88u) {

  1132.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1133.                        i, c->status[i].step_index);

  1134.                 return AVERROR_INVALIDDATA;

  1135.             }

  1136.         }

  1137.         for (i=0; i<=st; i++)

  1138.             c->status[i].predictor  = bytestream2_get_le32u(&gb);

  1139. 

  1140.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1141.             int byte   = bytestream2_get_byteu(&gb);

  1142.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   3);

  1143.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);

  1144.         }

  1145.         break;

  1146.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  1147.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1148.             int byte = bytestream2_get_byteu(&gb);

  1149.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   6);

  1150.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);

  1151.         }

  1152.         break;

  1153.     case AV_CODEC_ID_ADPCM_EA:

  1154.     {

  1155.         int previous_left_sample, previous_right_sample;

  1156.         int current_left_sample, current_right_sample;

  1157.         int next_left_sample, next_right_sample;

  1158.         int coeff1l, coeff2l, coeff1r, coeff2r;

  1159.         int shift_left, shift_right;

  1160. 

  1161.         /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,

  1162.            each coding 28 stereo samples. */

  1163. 

  1164.         if(avctx->channels != 2)

  1165.             return AVERROR_INVALIDDATA;

  1166. 

  1167.         current_left_sample   = sign_extend(bytestream2_get_le16u(&gb), 16);

  1168.         previous_left_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1169.         current_right_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1170.         previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

  1171. 

  1172.         for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1173.             int byte = bytestream2_get_byteu(&gb);

  1174.             coeff1l = ea_adpcm_table[ byte >> 4       ];

  1175.             coeff2l = ea_adpcm_table[(byte >> 4  ) + 4];

  1176.             coeff1r = ea_adpcm_table[ byte & 0x0F];

  1177.             coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];

  1178. 

  1179.             byte = bytestream2_get_byteu(&gb);

  1180.             shift_left  = 20 - (byte >> 4);

  1181.             shift_right = 20 - (byte & 0x0F);

  1182. 

  1183.             for (count2 = 0; count2 < 28; count2++) {

  1184.                 byte = bytestream2_get_byteu(&gb);

  1185.                 next_left_sample  = sign_extend(byte >> 4, 4) << shift_left;

  1186.                 next_right_sample = sign_extend(byte,      4) << shift_right;

  1187. 

  1188.                 next_left_sample = (next_left_sample +

  1189.                     (current_left_sample * coeff1l) +

  1190.                     (previous_left_sample * coeff2l) + 0x80) >> 8;

  1191.                 next_right_sample = (next_right_sample +

  1192.                     (current_right_sample * coeff1r) +

  1193.                     (previous_right_sample * coeff2r) + 0x80) >> 8;

  1194. 

  1195.                 previous_left_sample = current_left_sample;

  1196.                 current_left_sample = av_clip_int16(next_left_sample);

  1197.                 previous_right_sample = current_right_sample;

  1198.                 current_right_sample = av_clip_int16(next_right_sample);

  1199.                 *samples++ = current_left_sample;

  1200.                 *samples++ = current_right_sample;

  1201.             }

  1202.         }

  1203. 

  1204.         bytestream2_skip(&gb, 2); // Skip terminating 0x0000

  1205. 

  1206.         break;

  1207.     }

  1208.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

  1209.     {

  1210.         int coeff[2][2], shift[2];

  1211. 

  1212.         for(channel = 0; channel < avctx->channels; channel++) {

  1213.             int byte = bytestream2_get_byteu(&gb);

  1214.             for (i=0; i<2; i++)

  1215.                 coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];

  1216.             shift[channel] = 20 - (byte & 0x0F);

  1217.         }

  1218.         for (count1 = 0; count1 < nb_samples / 2; count1++) {

  1219.             int byte[2];

  1220. 

  1221.             byte[0] = bytestream2_get_byteu(&gb);

  1222.             if (st) byte[1] = bytestream2_get_byteu(&gb);

  1223.             for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */

  1224.                 for(channel = 0; channel < avctx->channels; channel++) {

  1225.                     int sample = sign_extend(byte[channel] >> i, 4) << shift[channel];

  1226.                     sample = (sample +

  1227.                              c->status[channel].sample1 * coeff[channel][0] +

  1228.                              c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;

  1229.                     c->status[channel].sample2 = c->status[channel].sample1;

  1230.                     c->status[channel].sample1 = av_clip_int16(sample);

  1231.                     *samples++ = c->status[channel].sample1;

  1232.                 }

  1233.             }

  1234.         }

  1235.         bytestream2_seek(&gb, 0, SEEK_END);

  1236.         break;

  1237.     }

  1238.     case AV_CODEC_ID_ADPCM_EA_R1:

  1239.     case AV_CODEC_ID_ADPCM_EA_R2:

  1240.     case AV_CODEC_ID_ADPCM_EA_R3: {

  1241.         /* channel numbering

  1242.            2chan: 0=fl, 1=fr

  1243.            4chan: 0=fl, 1=rl, 2=fr, 3=rr

  1244.            6chan: 0=fl, 1=c,  2=fr, 3=rl,  4=rr, 5=sub */

  1245.         const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;

  1246.         int previous_sample, current_sample, next_sample;

  1247.         int coeff1, coeff2;

  1248.         int shift;

  1249.         unsigned int channel;

  1250.         uint16_t *samplesC;

  1251.         int count = 0;

  1252.         int offsets[6];

  1253. 

  1254.         for (channel=0; channel<avctx->channels; channel++)

  1255.             offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :

  1256.                                              bytestream2_get_le32(&gb)) +

  1257.                                (avctx->channels + 1) * 4;

  1258. 

  1259.         for (channel=0; channel<avctx->channels; channel++) {

  1260.             bytestream2_seek(&gb, offsets[channel], SEEK_SET);

  1261.             samplesC = samples_p[channel];

  1262. 

  1263.             if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {

  1264.                 current_sample  = sign_extend(bytestream2_get_le16(&gb), 16);

  1265.                 previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);

  1266.             } else {

  1267.                 current_sample  = c->status[channel].predictor;

  1268.                 previous_sample = c->status[channel].prev_sample;

  1269.             }

  1270. 

  1271.             for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1272.                 int byte = bytestream2_get_byte(&gb);

  1273.                 if (byte == 0xEE) {  /* only seen in R2 and R3 */

  1274.                     current_sample  = sign_extend(bytestream2_get_be16(&gb), 16);

  1275.                     previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);

  1276. 

  1277.                     for (count2=0; count2<28; count2++)

  1278.                         *samplesC++ = sign_extend(bytestream2_get_be16(&gb), 16);

  1279.                 } else {

  1280.                     coeff1 = ea_adpcm_table[ byte >> 4     ];

  1281.                     coeff2 = ea_adpcm_table[(byte >> 4) + 4];

  1282.                     shift = 20 - (byte & 0x0F);

  1283. 

  1284.                     for (count2=0; count2<28; count2++) {

  1285.                         if (count2 & 1)

  1286.                             next_sample = sign_extend(byte,    4) << shift;

  1287.                         else {

  1288.                             byte = bytestream2_get_byte(&gb);

  1289.                             next_sample = sign_extend(byte >> 4, 4) << shift;

  1290.                         }

  1291. 

  1292.                         next_sample += (current_sample  * coeff1) +

  1293.                                        (previous_sample * coeff2);

  1294.                         next_sample = av_clip_int16(next_sample >> 8);

  1295. 

  1296.                         previous_sample = current_sample;

  1297.                         current_sample  = next_sample;

  1298.                         *samplesC++ = current_sample;

  1299.                     }

  1300.                 }

  1301.             }

  1302.             if (!count) {

  1303.                 count = count1;

  1304.             } else if (count != count1) {

  1305.                 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");

  1306.                 count = FFMAX(count, count1);

  1307.             }

  1308. 

  1309.             if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {

  1310.                 c->status[channel].predictor   = current_sample;

  1311.                 c->status[channel].prev_sample = previous_sample;

  1312.             }

  1313.         }

  1314. 

  1315.         frame->nb_samples = count * 28;

  1316.         bytestream2_seek(&gb, 0, SEEK_END);

  1317.         break;

  1318.     }

  1319.     case AV_CODEC_ID_ADPCM_EA_XAS:

  1320.         for (channel=0; channel<avctx->channels; channel++) {

  1321.             int coeff[2][4], shift[4];

  1322.             int16_t *s = samples_p[channel];

  1323.             for (n = 0; n < 4; n++, s += 32) {

  1324.                 int val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1325.                 for (i=0; i<2; i++)

  1326.                     coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];

  1327.                 s[0] = val & ~0x0F;

  1328. 

  1329.                 val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1330.                 shift[n] = 20 - (val & 0x0F);

  1331.                 s[1] = val & ~0x0F;

  1332.             }

  1333. 

  1334.             for (m=2; m<32; m+=2) {

  1335.                 s = &samples_p[channel][m];

  1336.                 for (n = 0; n < 4; n++, s += 32) {

  1337.                     int level, pred;

  1338.                     int byte = bytestream2_get_byteu(&gb);

  1339. 

  1340.                     level = sign_extend(byte >> 4, 4) << shift[n];

  1341.                     pred  = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];

  1342.                     s[0]  = av_clip_int16((level + pred + 0x80) >> 8);

  1343. 

  1344.                     level = sign_extend(byte, 4) << shift[n];

  1345.                     pred  = s[0] * coeff[0][n] + s[-1] * coeff[1][n];

  1346.                     s[1]  = av_clip_int16((level + pred + 0x80) >> 8);

  1347.                 }

  1348.             }

  1349.         }

  1350.         break;

  1351.     case AV_CODEC_ID_ADPCM_IMA_AMV:

  1352.         c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  1353.         c->status[0].step_index = bytestream2_get_byteu(&gb);

  1354.         bytestream2_skipu(&gb, 5);

  1355.         if (c->status[0].step_index > 88u) {

  1356.             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1357.                    c->status[0].step_index);

  1358.             return AVERROR_INVALIDDATA;

  1359.         }

  1360. 

  1361.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1362.             int v = bytestream2_get_byteu(&gb);

  1363. 

  1364.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);

  1365.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);

  1366.         }

  1367.         break;

  1368.     case AV_CODEC_ID_ADPCM_IMA_SMJPEG:

  1369.         for (i = 0; i < avctx->channels; i++) {

  1370.             c->status[i].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);

  1371.             c->status[i].step_index = bytestream2_get_byteu(&gb);

  1372.             bytestream2_skipu(&gb, 1);

  1373.             if (c->status[i].step_index > 88u) {

  1374.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1375.                        c->status[i].step_index);

  1376.                 return AVERROR_INVALIDDATA;

  1377.             }

  1378.         }

  1379. 

  1380.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1381.             int v = bytestream2_get_byteu(&gb);

  1382. 

  1383.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[0 ], v >> 4, 3);

  1384.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0xf, 3);

  1385.         }

  1386.         break;

  1387.     case AV_CODEC_ID_ADPCM_CT:

  1388.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1389.             int v = bytestream2_get_byteu(&gb);

  1390.             *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4  );

  1391.             *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);

  1392.         }

  1393.         break;

  1394.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  1395.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  1396.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  1397.         if (!c->status[0].step_index) {

  1398.             /* the first byte is a raw sample */

  1399.             *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1400.             if (st)

  1401.                 *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1402.             c->status[0].step_index = 1;

  1403.             nb_samples--;

  1404.         }

  1405.         if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {

  1406.             for (n = nb_samples >> (1 - st); n > 0; n--) {

  1407.                 int byte = bytestream2_get_byteu(&gb);

  1408.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1409.                                                        byte >> 4,   4, 0);

  1410.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1411.                                                        byte & 0x0F, 4, 0);

  1412.             }

  1413.         } else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {

  1414.             for (n = (nb_samples<<st) / 3; n > 0; n--) {

  1415.                 int byte = bytestream2_get_byteu(&gb);

  1416.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1417.                                                         byte >> 5        , 3, 0);

  1418.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1419.                                                        (byte >> 2) & 0x07, 3, 0);

  1420.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1421.                                                         byte & 0x03,       2, 0);

  1422.             }

  1423.         } else {

  1424.             for (n = nb_samples >> (2 - st); n > 0; n--) {

  1425.                 int byte = bytestream2_get_byteu(&gb);

  1426.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1427.                                                         byte >> 6        , 2, 2);

  1428.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1429.                                                        (byte >> 4) & 0x03, 2, 2);

  1430.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1431.                                                        (byte >> 2) & 0x03, 2, 2);

  1432.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1433.                                                         byte & 0x03,       2, 2);

  1434.             }

  1435.         }

  1436.         break;

  1437.     case AV_CODEC_ID_ADPCM_SWF:

  1438.         adpcm_swf_decode(avctx, buf, buf_size, samples);

  1439.         bytestream2_seek(&gb, 0, SEEK_END);

  1440.         break;

  1441.     case AV_CODEC_ID_ADPCM_YAMAHA:

  1442.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1443.             int v = bytestream2_get_byteu(&gb);

  1444.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);

  1445.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4  );

  1446.         }

  1447.         break;

  1448.     case AV_CODEC_ID_ADPCM_AICA:

  1449.         if (!c->has_status) {

  1450.             for (channel = 0; channel < avctx->channels; channel++)

  1451.                 c->status[channel].step = 0;

  1452.             c->has_status = 1;

  1453.         }

  1454.         for (channel = 0; channel < avctx->channels; channel++) {

  1455.             samples = samples_p[channel];

  1456.             for (n = nb_samples >> 1; n > 0; n--) {

  1457.                 int v = bytestream2_get_byteu(&gb);

  1458.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v & 0x0F);

  1459.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v >> 4  );

  1460.             }

  1461.         }

  1462.         break;

  1463.     case AV_CODEC_ID_ADPCM_AFC:

  1464.     {

  1465.         int samples_per_block;

  1466.         int blocks;

  1467. 

  1468.         if (avctx->extradata && avctx->extradata_size == 1 && avctx->extradata[0]) {

  1469.             samples_per_block = avctx->extradata[0] / 16;

  1470.             blocks = nb_samples / avctx->extradata[0];

  1471.         } else {

  1472.             samples_per_block = nb_samples / 16;

  1473.             blocks = 1;

  1474.         }

  1475. 

  1476.         for (m = 0; m < blocks; m++) {

  1477.         for (channel = 0; channel < avctx->channels; channel++) {

  1478.             int prev1 = c->status[channel].sample1;

  1479.             int prev2 = c->status[channel].sample2;

  1480. 

  1481.             samples = samples_p[channel] + m * 16;

  1482.             /* Read in every sample for this channel.  */

  1483.             for (i = 0; i < samples_per_block; i++) {

  1484.                 int byte = bytestream2_get_byteu(&gb);

  1485.                 int scale = 1 << (byte >> 4);

  1486.                 int index = byte & 0xf;

  1487.                 int factor1 = ff_adpcm_afc_coeffs[0][index];

  1488.                 int factor2 = ff_adpcm_afc_coeffs[1][index];

  1489. 

  1490.                 /* Decode 16 samples.  */

  1491.                 for (n = 0; n < 16; n++) {

  1492.                     int32_t sampledat;

  1493. 

  1494.                     if (n & 1) {

  1495.                         sampledat = sign_extend(byte, 4);

  1496.                     } else {

  1497.                         byte = bytestream2_get_byteu(&gb);

  1498.                         sampledat = sign_extend(byte >> 4, 4);

  1499.                     }

  1500. 

  1501.                     sampledat = ((prev1 * factor1 + prev2 * factor2) +

  1502.                                  ((sampledat * scale) << 11)) >> 11;

  1503.                     *samples = av_clip_int16(sampledat);

  1504.                     prev2 = prev1;

  1505.                     prev1 = *samples++;

  1506.                 }

  1507.             }

  1508. 

  1509.             c->status[channel].sample1 = prev1;

  1510.             c->status[channel].sample2 = prev2;

  1511.         }

  1512.         }

  1513.         bytestream2_seek(&gb, 0, SEEK_END);

  1514.         break;

  1515.     }

  1516.     case AV_CODEC_ID_ADPCM_THP:

  1517.     case AV_CODEC_ID_ADPCM_THP_LE:

  1518.     {

  1519.         int table[14][16];

  1520.         int ch;

  1521. 

  1522. #define THP_GET16(g) \

  1523.     sign_extend( \

  1524.         avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE ? \

  1525.         bytestream2_get_le16u(&(g)) : \

  1526.         bytestream2_get_be16u(&(g)), 16)

  1527. 

  1528.         if (avctx->extradata) {

  1529.             GetByteContext tb;

  1530.             if (avctx->extradata_size < 32 * avctx->channels) {

  1531.                 av_log(avctx, AV_LOG_ERROR, "Missing coeff table\n");

  1532.                 return AVERROR_INVALIDDATA;

  1533.             }

  1534. 

  1535.             bytestream2_init(&tb, avctx->extradata, avctx->extradata_size);

  1536.             for (i = 0; i < avctx->channels; i++)

  1537.                 for (n = 0; n < 16; n++)

  1538.                     table[i][n] = THP_GET16(tb);

  1539.         } else {

  1540.             for (i = 0; i < avctx->channels; i++)

  1541.                 for (n = 0; n < 16; n++)

  1542.                     table[i][n] = THP_GET16(gb);

  1543. 

  1544.             if (!c->has_status) {

  1545.                 /* Initialize the previous sample.  */

  1546.                 for (i = 0; i < avctx->channels; i++) {

  1547.                     c->status[i].sample1 = THP_GET16(gb);

  1548.                     c->status[i].sample2 = THP_GET16(gb);

  1549.                 }

  1550.                 c->has_status = 1;

  1551.             } else {

  1552.                 bytestream2_skip(&gb, avctx->channels * 4);

  1553.             }

  1554.         }

  1555. 

  1556.         for (ch = 0; ch < avctx->channels; ch++) {

  1557.             samples = samples_p[ch];

  1558. 

  1559.             /* Read in every sample for this channel.  */

  1560.             for (i = 0; i < (nb_samples + 13) / 14; i++) {

  1561.                 int byte = bytestream2_get_byteu(&gb);

  1562.                 int index = (byte >> 4) & 7;

  1563.                 unsigned int exp = byte & 0x0F;

  1564.                 int factor1 = table[ch][index * 2];

  1565.                 int factor2 = table[ch][index * 2 + 1];

  1566. 

  1567.                 /* Decode 14 samples.  */

  1568.                 for (n = 0; n < 14 && (i * 14 + n < nb_samples); n++) {

  1569.                     int32_t sampledat;

  1570. 

  1571.                     if (n & 1) {

  1572.                         sampledat = sign_extend(byte, 4);

  1573.                     } else {

  1574.                         byte = bytestream2_get_byteu(&gb);

  1575.                         sampledat = sign_extend(byte >> 4, 4);

  1576.                     }

  1577. 

  1578.                     sampledat = ((c->status[ch].sample1 * factor1

  1579.                                 + c->status[ch].sample2 * factor2) >> 11) + (sampledat << exp);

  1580.                     *samples = av_clip_int16(sampledat);

  1581.                     c->status[ch].sample2 = c->status[ch].sample1;

  1582.                     c->status[ch].sample1 = *samples++;

  1583.                 }

  1584.             }

  1585.         }

  1586.         break;

  1587.     }

  1588.     case AV_CODEC_ID_ADPCM_DTK:

  1589.         for (channel = 0; channel < avctx->channels; channel++) {

  1590.             samples = samples_p[channel];

  1591. 

  1592.             /* Read in every sample for this channel.  */

  1593.             for (i = 0; i < nb_samples / 28; i++) {

  1594.                 int byte, header;

  1595.                 if (channel)

  1596.                     bytestream2_skipu(&gb, 1);

  1597.                 header = bytestream2_get_byteu(&gb);

  1598.                 bytestream2_skipu(&gb, 3 - channel);

  1599. 

  1600.                 /* Decode 28 samples.  */

  1601.                 for (n = 0; n < 28; n++) {

  1602.                     int32_t sampledat, prev;

  1603. 

  1604.                     switch (header >> 4) {

  1605.                     case 1:

  1606.                         prev = (c->status[channel].sample1 * 0x3c);

  1607.                         break;

  1608.                     case 2:

  1609.                         prev = (c->status[channel].sample1 * 0x73) - (c->status[channel].sample2 * 0x34);

  1610.                         break;

  1611.                     case 3:

  1612.                         prev = (c->status[channel].sample1 * 0x62) - (c->status[channel].sample2 * 0x37);

  1613.                         break;

  1614.                     default:

  1615.                         prev = 0;

  1616.                     }

  1617. 

  1618.                     prev = av_clip_intp2((prev + 0x20) >> 6, 21);

  1619. 

  1620.                     byte = bytestream2_get_byteu(&gb);

  1621.                     if (!channel)

  1622.                         sampledat = sign_extend(byte, 4);

  1623.                     else

  1624.                         sampledat = sign_extend(byte >> 4, 4);

  1625. 

  1626.                     sampledat = (((sampledat << 12) >> (header & 0xf)) << 6) + prev;

  1627.                     *samples++ = av_clip_int16(sampledat >> 6);

  1628.                     c->status[channel].sample2 = c->status[channel].sample1;

  1629.                     c->status[channel].sample1 = sampledat;

  1630.                 }

  1631.             }

  1632.             if (!channel)

  1633.                 bytestream2_seek(&gb, 0, SEEK_SET);

  1634.         }

  1635.         break;

  1636.     case AV_CODEC_ID_ADPCM_PSX:

  1637.         for (channel = 0; channel < avctx->channels; channel++) {

  1638.             samples = samples_p[channel];

  1639. 

  1640.             /* Read in every sample for this channel.  */

  1641.             for (i = 0; i < nb_samples / 28; i++) {

  1642.                 int filter, shift, flag, byte;

  1643. 

  1644.                 filter = bytestream2_get_byteu(&gb);

  1645.                 shift  = filter & 0xf;

  1646.                 filter = filter >> 4;

  1647.                 if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table))

  1648.                     return AVERROR_INVALIDDATA;

  1649.                 flag   = bytestream2_get_byteu(&gb);

  1650. 

  1651.                 /* Decode 28 samples.  */

  1652.                 for (n = 0; n < 28; n++) {

  1653.                     int sample = 0, scale;

  1654. 

  1655.                     if (flag < 0x07) {

  1656.                         if (n & 1) {

  1657.                             scale = sign_extend(byte >> 4, 4);

  1658.                         } else {

  1659.                             byte  = bytestream2_get_byteu(&gb);

  1660.                             scale = sign_extend(byte, 4);

  1661.                         }

  1662. 

  1663.                         scale  = scale << 12;

  1664.                         sample = (int)((scale >> shift) + (c->status[channel].sample1 * xa_adpcm_table[filter][0] + c->status[channel].sample2 * xa_adpcm_table[filter][1]) / 64);

  1665.                     }

  1666.                     *samples++ = av_clip_int16(sample);

  1667.                     c->status[channel].sample2 = c->status[channel].sample1;

  1668.                     c->status[channel].sample1 = sample;

  1669.                 }

  1670.             }

  1671.         }

  1672.         break;

  1673. 

  1674.     default:

  1675.         return -1;

  1676.     }

  1677. 

  1678.     if (avpkt->size && bytestream2_tell(&gb) == 0) {

  1679.         av_log(avctx, AV_LOG_ERROR, "Nothing consumed\n");

  1680.         return AVERROR_INVALIDDATA;

  1681.     }

  1682. 

  1683.     *got_frame_ptr = 1;

  1684. 

  1685.     if (avpkt->size < bytestream2_tell(&gb)) {

  1686.         av_log(avctx, AV_LOG_ERROR, "Overread of %d < %d\n", avpkt->size, bytestream2_tell(&gb));

  1687.         return avpkt->size;

  1688.     }

  1689. 

  1690.     return bytestream2_tell(&gb);

  1691. }

  1692. 

  1693. static void adpcm_flush(AVCodecContext *avctx)

  1694. {

  1695.     ADPCMDecodeContext *c = avctx->priv_data;

  1696.     c->has_status = 0;

  1697. }

  1698. 

  1699. 

  1700. static const enum AVSampleFormat sample_fmts_s16[]  = { AV_SAMPLE_FMT_S16,

  1701.                                                         AV_SAMPLE_FMT_NONE };

  1702. static const enum AVSampleFormat sample_fmts_s16p[] = { AV_SAMPLE_FMT_S16P,

  1703.                                                         AV_SAMPLE_FMT_NONE };

  1704. static const enum AVSampleFormat sample_fmts_both[] = { AV_SAMPLE_FMT_S16,

  1705.                                                         AV_SAMPLE_FMT_S16P,

  1706.                                                         AV_SAMPLE_FMT_NONE };

  1707. 

  1708. #define ADPCM_DECODER(id_, sample_fmts_, name_, long_name_) \

  1709. AVCodec ff_ ## name_ ## _decoder = {                        \

  1710.     .name           = #name_,                               \

  1711.     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \

  1712.     .type           = AVMEDIA_TYPE_AUDIO,                   \

  1713.     .id             = id_,                                  \

  1714.     .priv_data_size = sizeof(ADPCMDecodeContext),           \

  1715.     .init           = adpcm_decode_init,                    \

  1716.     .decode         = adpcm_decode_frame,                   \

  1717.     .flush          = adpcm_flush,                          \

  1718.     .capabilities   = AV_CODEC_CAP_DR1,                     \

  1719.     .sample_fmts    = sample_fmts_,                         \

  1720. }

  1721. 

  1722. /* Note: Do not forget to add new entries to the Makefile as well. */

  1723. ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM,         sample_fmts_s16p, adpcm_4xm,         "ADPCM 4X Movie");

  1724. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AFC,         sample_fmts_s16p, adpcm_afc,         "ADPCM Nintendo Gamecube AFC");

  1725. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AICA,        sample_fmts_s16p, adpcm_aica,        "ADPCM Yamaha AICA");

  1726. ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT,          sample_fmts_s16,  adpcm_ct,          "ADPCM Creative Technology");

  1727. ADPCM_DECODER(AV_CODEC_ID_ADPCM_DTK,         sample_fmts_s16p, adpcm_dtk,         "ADPCM Nintendo Gamecube DTK");

  1728. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA,          sample_fmts_s16,  adpcm_ea,          "ADPCM Electronic Arts");

  1729. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, sample_fmts_s16,  adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");

  1730. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1,       sample_fmts_s16p, adpcm_ea_r1,       "ADPCM Electronic Arts R1");

  1731. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2,       sample_fmts_s16p, adpcm_ea_r2,       "ADPCM Electronic Arts R2");

  1732. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3,       sample_fmts_s16p, adpcm_ea_r3,       "ADPCM Electronic Arts R3");

  1733. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS,      sample_fmts_s16p, adpcm_ea_xas,      "ADPCM Electronic Arts XAS");

  1734. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV,     sample_fmts_s16,  adpcm_ima_amv,     "ADPCM IMA AMV");

  1735. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC,     sample_fmts_s16,  adpcm_ima_apc,     "ADPCM IMA CRYO APC");

  1736. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DAT4,    sample_fmts_s16,  adpcm_ima_dat4,    "ADPCM IMA Eurocom DAT4");

  1737. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3,     sample_fmts_s16,  adpcm_ima_dk3,     "ADPCM IMA Duck DK3");

  1738. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4,     sample_fmts_s16,  adpcm_ima_dk4,     "ADPCM IMA Duck DK4");

  1739. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, sample_fmts_s16,  adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");

  1740. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, sample_fmts_s16,  adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");

  1741. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS,     sample_fmts_s16,  adpcm_ima_iss,     "ADPCM IMA Funcom ISS");

  1742. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI,     sample_fmts_s16,  adpcm_ima_oki,     "ADPCM IMA Dialogic OKI");

  1743. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT,      sample_fmts_s16p, adpcm_ima_qt,      "ADPCM IMA QuickTime");

  1744. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_RAD,     sample_fmts_s16,  adpcm_ima_rad,     "ADPCM IMA Radical");

  1745. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG,  sample_fmts_s16,  adpcm_ima_smjpeg,  "ADPCM IMA Loki SDL MJPEG");

  1746. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV,     sample_fmts_s16p, adpcm_ima_wav,     "ADPCM IMA WAV");

  1747. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS,      sample_fmts_both, adpcm_ima_ws,      "ADPCM IMA Westwood");

  1748. ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS,          sample_fmts_s16,  adpcm_ms,          "ADPCM Microsoft");

  1749. ADPCM_DECODER(AV_CODEC_ID_ADPCM_MTAF,        sample_fmts_s16p, adpcm_mtaf,        "ADPCM MTAF");

  1750. ADPCM_DECODER(AV_CODEC_ID_ADPCM_PSX,         sample_fmts_s16p, adpcm_psx,         "ADPCM Playstation");

  1751. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2,     sample_fmts_s16,  adpcm_sbpro_2,     "ADPCM Sound Blaster Pro 2-bit");

  1752. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3,     sample_fmts_s16,  adpcm_sbpro_3,     "ADPCM Sound Blaster Pro 2.6-bit");

  1753. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4,     sample_fmts_s16,  adpcm_sbpro_4,     "ADPCM Sound Blaster Pro 4-bit");

  1754. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF,         sample_fmts_s16,  adpcm_swf,         "ADPCM Shockwave Flash");

  1755. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP_LE,      sample_fmts_s16p, adpcm_thp_le,      "ADPCM Nintendo THP (little-endian)");

  1756. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP,         sample_fmts_s16p, adpcm_thp,         "ADPCM Nintendo THP");

  1757. ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA,          sample_fmts_s16p, adpcm_xa,          "ADPCM CDROM XA");

  1758. ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA,      sample_fmts_s16,  adpcm_yamaha,      "ADPCM Yamaha");