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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_THP:

  114.     case AV_CODEC_ID_ADPCM_THP_LE:

  115.         max_channels = 14;

  116.         break;

  117.     }

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

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

  120.         return AVERROR(EINVAL);

  121.     }

  122. 

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

  124.     case AV_CODEC_ID_ADPCM_CT:

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

  126.         break;

  127.     case AV_CODEC_ID_ADPCM_IMA_WAV:

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

  129.             return AVERROR_INVALIDDATA;

  130.         break;

  131.     case AV_CODEC_ID_ADPCM_IMA_APC:

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

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

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

  135.         }

  136.         break;

  137.     case AV_CODEC_ID_ADPCM_IMA_WS:

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

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

  140.         break;

  141.     default:

  142.         break;

  143.     }

  144. 

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

  146.         case AV_CODEC_ID_ADPCM_IMA_QT:

  147.         case AV_CODEC_ID_ADPCM_IMA_WAV:

  148.         case AV_CODEC_ID_ADPCM_4XM:

  149.         case AV_CODEC_ID_ADPCM_XA:

  150.         case AV_CODEC_ID_ADPCM_EA_R1:

  151.         case AV_CODEC_ID_ADPCM_EA_R2:

  152.         case AV_CODEC_ID_ADPCM_EA_R3:

  153.         case AV_CODEC_ID_ADPCM_EA_XAS:

  154.         case AV_CODEC_ID_ADPCM_THP:

  155.         case AV_CODEC_ID_ADPCM_THP_LE:

  156.         case AV_CODEC_ID_ADPCM_AFC:

  157.         case AV_CODEC_ID_ADPCM_DTK:

  158.         case AV_CODEC_ID_ADPCM_PSX:

  159.             avctx->sample_fmt = AV_SAMPLE_FMT_S16P;

  160.             break;

  161.         case AV_CODEC_ID_ADPCM_IMA_WS:

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

  163.                                                       AV_SAMPLE_FMT_S16;

  164.             break;

  165.         default:

  166.             avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  167.     }

  168. 

  169.     return 0;

  170. }

  171. 

  172. static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)

  173. {

  174.     int step_index;

  175.     int predictor;

  176.     int sign, delta, diff, step;

  177. 

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

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

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

  181. 

  182.     sign = nibble & 8;

  183.     delta = nibble & 7;

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

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

  186.      * quickly enough */

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

  188.     predictor = c->predictor;

  189.     if (sign) predictor -= diff;

  190.     else predictor += diff;

  191. 

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

  193.     c->step_index = step_index;

  194. 

  195.     return (short)c->predictor;

  196. }

  197. 

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

  199. {

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

  201. 

  202.     shift = bps - 1;

  203.     nibble = get_bits_le(gb, bps),

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

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

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

  207. 

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

  209.     delta = av_mod_uintp2(nibble, shift);

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

  211.     predictor = c->predictor;

  212.     if (sign) predictor -= diff;

  213.     else predictor += diff;

  214. 

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

  216.     c->step_index = step_index;

  217. 

  218.     return (int16_t)c->predictor;

  219. }

  220. 

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

  222. {

  223.     int step_index;

  224.     int predictor;

  225.     int diff, step;

  226. 

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

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

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

  230. 

  231.     diff = step >> 3;

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

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

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

  235. 

  236.     if (nibble & 8)

  237.         predictor = c->predictor - diff;

  238.     else

  239.         predictor = c->predictor + diff;

  240. 

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

  242.     c->step_index = step_index;

  243. 

  244.     return c->predictor;

  245. }

  246. 

  247. static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, int nibble)

  248. {

  249.     int predictor;

  250. 

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

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

  253. 

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

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

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

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

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

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

  260.         c->idelta = INT_MAX/768;

  261.     }

  262. 

  263.     return c->sample1;

  264. }

  265. 

  266. static inline short adpcm_ima_oki_expand_nibble(ADPCMChannelStatus *c, int nibble)

  267. {

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

  269. 

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

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

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

  273. 

  274.     sign = nibble & 8;

  275.     delta = nibble & 7;

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

  277.     predictor = c->predictor;

  278.     if (sign) predictor -= diff;

  279.     else predictor += diff;

  280. 

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

  282.     c->step_index = step_index;

  283. 

  284.     return c->predictor << 4;

  285. }

  286. 

  287. static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)

  288. {

  289.     int sign, delta, diff;

  290.     int new_step;

  291. 

  292.     sign = nibble & 8;

  293.     delta = nibble & 7;

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

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

  296.      * quickly enough */

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

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

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

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

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

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

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

  304. 

  305.     return (short)c->predictor;

  306. }

  307. 

  308. static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)

  309. {

  310.     int sign, delta, diff;

  311. 

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

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

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

  315. 

  316.     /* clamp result */

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

  318. 

  319.     /* calculate new step */

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

  321.         c->step++;

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

  323.         c->step--;

  324. 

  325.     return (short) c->predictor;

  326. }

  327. 

  328. static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)

  329. {

  330.     if(!c->step) {

  331.         c->predictor = 0;

  332.         c->step = 127;

  333.     }

  334. 

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

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

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

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

  339.     return c->predictor;

  340. }

  341. 

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

  343.                      const uint8_t *in, ADPCMChannelStatus *left,

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

  345. {

  346.     int i, j;

  347.     int shift,filter,f0,f1;

  348.     int s_1,s_2;

  349.     int d,s,t;

  350. 

  351.     out0 += sample_offset;

  352.     if (channels == 1)

  353.         out1 = out0 + 28;

  354.     else

  355.         out1 += sample_offset;

  356. 

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

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

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

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

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

  362.             filter=0;

  363.         }

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

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

  366. 

  367.         s_1 = left->sample1;

  368.         s_2 = left->sample2;

  369. 

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

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

  372. 

  373.             t = sign_extend(d, 4);

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

  375.             s_2 = s_1;

  376.             s_1 = av_clip_int16(s);

  377.             out0[j] = s_1;

  378.         }

  379. 

  380.         if (channels == 2) {

  381.             left->sample1 = s_1;

  382.             left->sample2 = s_2;

  383.             s_1 = right->sample1;

  384.             s_2 = right->sample2;

  385.         }

  386. 

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

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

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

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

  391.             filter=0;

  392.         }

  393. 

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

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

  396. 

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

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

  399. 

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

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

  402.             s_2 = s_1;

  403.             s_1 = av_clip_int16(s);

  404.             out1[j] = s_1;

  405.         }

  406. 

  407.         if (channels == 2) {

  408.             right->sample1 = s_1;

  409.             right->sample2 = s_2;

  410.         } else {

  411.             left->sample1 = s_1;

  412.             left->sample2 = s_2;

  413.         }

  414. 

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

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

  417.     }

  418. 

  419.     return 0;

  420. }

  421. 

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

  423. {

  424.     ADPCMDecodeContext *c = avctx->priv_data;

  425.     GetBitContext gb;

  426.     const int *table;

  427.     int k0, signmask, nb_bits, count;

  428.     int size = buf_size*8;

  429.     int i;

  430. 

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

  432. 

  433.     //read bits & initial values

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

  435.     table = swf_index_tables[nb_bits-2];

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

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

  438. 

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

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

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

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

  443.         }

  444. 

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

  446.             int i;

  447. 

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

  449.                 // similar to IMA adpcm

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

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

  452.                 long vpdiff = 0; // vpdiff = (delta+0.5)*step/4

  453.                 int k = k0;

  454. 

  455.                 do {

  456.                     if (delta & k)

  457.                         vpdiff += step;

  458.                     step >>= 1;

  459.                     k >>= 1;

  460.                 } while(k);

  461.                 vpdiff += step;

  462. 

  463.                 if (delta & signmask)

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

  465.                 else

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

  467. 

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

  469. 

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

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

  472. 

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

  474.             }

  475.         }

  476.     }

  477. }

  478. 

  479. /**

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

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

  482.  * decode with the given buf_size.

  483.  *

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

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

  486.  *                           number of samples in each frame.

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

  488.  *                               returned is an approximation.

  489.  */

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

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

  492. {

  493.     ADPCMDecodeContext *s = avctx->priv_data;

  494.     int nb_samples        = 0;

  495.     int ch                = avctx->channels;

  496.     int has_coded_samples = 0;

  497.     int header_size;

  498. 

  499.     *coded_samples = 0;

  500.     *approx_nb_samples = 0;

  501. 

  502.     if(ch <= 0)

  503.         return 0;

  504. 

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

  506.     /* constant, only check buf_size */

  507.     case AV_CODEC_ID_ADPCM_EA_XAS:

  508.         if (buf_size < 76 * ch)

  509.             return 0;

  510.         nb_samples = 128;

  511.         break;

  512.     case AV_CODEC_ID_ADPCM_IMA_QT:

  513.         if (buf_size < 34 * ch)

  514.             return 0;

  515.         nb_samples = 64;

  516.         break;

  517.     /* simple 4-bit adpcm */

  518.     case AV_CODEC_ID_ADPCM_CT:

  519.     case AV_CODEC_ID_ADPCM_IMA_APC:

  520.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  521.     case AV_CODEC_ID_ADPCM_IMA_OKI:

  522.     case AV_CODEC_ID_ADPCM_IMA_WS:

  523.     case AV_CODEC_ID_ADPCM_YAMAHA:

  524.         nb_samples = buf_size * 2 / ch;

  525.         break;

  526.     }

  527.     if (nb_samples)

  528.         return nb_samples;

  529. 

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

  531.     header_size = 0;

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

  533.         case AV_CODEC_ID_ADPCM_4XM:

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

  535.         case AV_CODEC_ID_ADPCM_IMA_AMV:     header_size = 8;           break;

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

  537.     }

  538.     if (header_size > 0)

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

  540. 

  541.     /* more complex formats */

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

  543.     case AV_CODEC_ID_ADPCM_EA:

  544.         has_coded_samples = 1;

  545.         *coded_samples  = bytestream2_get_le32(gb);

  546.         *coded_samples -= *coded_samples % 28;

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

  548.         break;

  549.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  550.         has_coded_samples = 1;

  551.         *coded_samples = bytestream2_get_le32(gb);

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

  553.         break;

  554.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

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

  556.         break;

  557.     case AV_CODEC_ID_ADPCM_EA_R1:

  558.     case AV_CODEC_ID_ADPCM_EA_R2:

  559.     case AV_CODEC_ID_ADPCM_EA_R3:

  560.         /* maximum number of samples */

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

  562.         has_coded_samples = 1;

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

  564.         case AV_CODEC_ID_ADPCM_EA_R1:

  565.             header_size    = 4 + 9 * ch;

  566.             *coded_samples = bytestream2_get_le32(gb);

  567.             break;

  568.         case AV_CODEC_ID_ADPCM_EA_R2:

  569.             header_size    = 4 + 5 * ch;

  570.             *coded_samples = bytestream2_get_le32(gb);

  571.             break;

  572.         case AV_CODEC_ID_ADPCM_EA_R3:

  573.             header_size    = 4 + 5 * ch;

  574.             *coded_samples = bytestream2_get_be32(gb);

  575.             break;

  576.         }

  577.         *coded_samples -= *coded_samples % 28;

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

  579.         nb_samples     -= nb_samples % 28;

  580.         *approx_nb_samples = 1;

  581.         break;

  582.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  583.         if (avctx->block_align > 0)

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

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

  586.         break;

  587.     case AV_CODEC_ID_ADPCM_IMA_DK4:

  588.         if (avctx->block_align > 0)

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

  590.         if (buf_size < 4 * ch)

  591.             return AVERROR_INVALIDDATA;

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

  593.         break;

  594.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  595.         if (avctx->block_align > 0)

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

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

  598.         break;

  599.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  600.     {

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

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

  603.         if (avctx->block_align > 0)

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

  605.         if (buf_size < 4 * ch)

  606.             return AVERROR_INVALIDDATA;

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

  608.         break;

  609.     }

  610.     case AV_CODEC_ID_ADPCM_MS:

  611.         if (avctx->block_align > 0)

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

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

  614.         break;

  615.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  616.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  617.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  618.     {

  619.         int samples_per_byte;

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

  621.         case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;

  622.         case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;

  623.         case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;

  624.         }

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

  626.             if (buf_size < ch)

  627.                 return AVERROR_INVALIDDATA;

  628.             nb_samples++;

  629.             buf_size -= ch;

  630.         }

  631.         nb_samples += buf_size * samples_per_byte / ch;

  632.         break;

  633.     }

  634.     case AV_CODEC_ID_ADPCM_SWF:

  635.     {

  636.         int buf_bits       = buf_size * 8 - 2;

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

  638.         int block_hdr_size = 22 * ch;

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

  640.         int nblocks        = buf_bits / block_size;

  641.         int bits_left      = buf_bits - nblocks * block_size;

  642.         nb_samples         = nblocks * 4096;

  643.         if (bits_left >= block_hdr_size)

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

  645.         break;

  646.     }

  647.     case AV_CODEC_ID_ADPCM_THP:

  648.     case AV_CODEC_ID_ADPCM_THP_LE:

  649.         if (avctx->extradata) {

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

  651.             break;

  652.         }

  653.         has_coded_samples = 1;

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

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

  656.                           bytestream2_get_le32(gb) :

  657.                           bytestream2_get_be32(gb);

  658.         buf_size       -= 8 + 36 * ch;

  659.         buf_size       /= ch;

  660.         nb_samples      = buf_size / 8 * 14;

  661.         if (buf_size % 8 > 1)

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

  663.         *approx_nb_samples = 1;

  664.         break;

  665.     case AV_CODEC_ID_ADPCM_AFC:

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

  667.         break;

  668.     case AV_CODEC_ID_ADPCM_XA:

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

  670.         break;

  671.     case AV_CODEC_ID_ADPCM_DTK:

  672.     case AV_CODEC_ID_ADPCM_PSX:

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

  674.         break;

  675.     }

  676. 

  677.     /* validate coded sample count */

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

  679.         return AVERROR_INVALIDDATA;

  680. 

  681.     return nb_samples;

  682. }

  683. 

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

  685.                               int *got_frame_ptr, AVPacket *avpkt)

  686. {

  687.     AVFrame *frame     = data;

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

  689.     int buf_size = avpkt->size;

  690.     ADPCMDecodeContext *c = avctx->priv_data;

  691.     ADPCMChannelStatus *cs;

  692.     int n, m, channel, i;

  693.     short *samples;

  694.     int16_t **samples_p;

  695.     int st; /* stereo */

  696.     int count1, count2;

  697.     int nb_samples, coded_samples, approx_nb_samples, ret;

  698.     GetByteContext gb;

  699. 

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

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

  702.     if (nb_samples <= 0) {

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

  704.         return AVERROR_INVALIDDATA;

  705.     }

  706. 

  707.     /* get output buffer */

  708.     frame->nb_samples = nb_samples;

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

  710.         return ret;

  711.     samples = (short *)frame->data[0];

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

  713. 

  714.     /* use coded_samples when applicable */

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

  716.     if (coded_samples) {

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

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

  719.         frame->nb_samples = nb_samples = coded_samples;

  720.     }

  721. 

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

  723. 

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

  725.     case AV_CODEC_ID_ADPCM_IMA_QT:

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

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

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

  729.             int predictor;

  730.             int step_index;

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

  732.             /* (pppppp) (piiiiiii) */

  733. 

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

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

  736.             step_index = predictor & 0x7F;

  737.             predictor &= ~0x7F;

  738. 

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

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

  741.                 if (diff < 0)

  742.                     diff = - diff;

  743.                 if (diff > 0x7f)

  744.                     goto update;

  745.             } else {

  746.             update:

  747.                 cs->step_index = step_index;

  748.                 cs->predictor = predictor;

  749.             }

  750. 

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

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

  753.                        channel, cs->step_index);

  754.                 return AVERROR_INVALIDDATA;

  755.             }

  756. 

  757.             samples = samples_p[channel];

  758. 

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

  760.                 int byte = bytestream2_get_byteu(&gb);

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

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

  763.             }

  764.         }

  765.         break;

  766.     case AV_CODEC_ID_ADPCM_IMA_WAV:

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

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

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

  770. 

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

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

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

  774.                        i, cs->step_index);

  775.                 return AVERROR_INVALIDDATA;

  776.             }

  777.         }

  778. 

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

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

  781.             GetBitContext g;

  782. 

  783.             ret = init_get_bits8(&g, gb.buffer, bytestream2_get_bytes_left(&gb));

  784.             if (ret < 0)

  785.                 return ret;

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

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

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

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

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

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

  792.                                           avctx->bits_per_coded_sample);

  793.                     }

  794.                 }

  795.             }

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

  797.         } else {

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

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

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

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

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

  803.                     int v = bytestream2_get_byteu(&gb);

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

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

  806.                 }

  807.             }

  808.         }

  809.         }

  810.         break;

  811.     case AV_CODEC_ID_ADPCM_4XM:

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

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

  814. 

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

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

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

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

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

  820.                 return AVERROR_INVALIDDATA;

  821.             }

  822.         }

  823. 

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

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

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

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

  828.                 int v = bytestream2_get_byteu(&gb);

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

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

  831.             }

  832.         }

  833.         break;

  834.     case AV_CODEC_ID_ADPCM_MS:

  835.     {

  836.         int block_predictor;

  837. 

  838.         block_predictor = bytestream2_get_byteu(&gb);

  839.         if (block_predictor > 6) {

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

  841.                    block_predictor);

  842.             return AVERROR_INVALIDDATA;

  843.         }

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

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

  846.         if (st) {

  847.             block_predictor = bytestream2_get_byteu(&gb);

  848.             if (block_predictor > 6) {

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

  850.                        block_predictor);

  851.                 return AVERROR_INVALIDDATA;

  852.             }

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

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

  855.         }

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

  857.         if (st){

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

  859.         }

  860. 

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

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

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

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

  865. 

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

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

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

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

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

  871.             int byte = bytestream2_get_byteu(&gb);

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

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

  874.         }

  875.         break;

  876.     }

  877.     case AV_CODEC_ID_ADPCM_IMA_DK4:

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

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

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

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

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

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

  884.                        channel, cs->step_index);

  885.                 return AVERROR_INVALIDDATA;

  886.             }

  887.         }

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

  889.             int v = bytestream2_get_byteu(&gb);

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

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

  892.         }

  893.         break;

  894.     case AV_CODEC_ID_ADPCM_IMA_DK3:

  895.     {

  896.         int last_byte = 0;

  897.         int nibble;

  898.         int decode_top_nibble_next = 0;

  899.         int diff_channel;

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

  901. 

  902.         bytestream2_skipu(&gb, 10);

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

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

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

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

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

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

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

  910.             return AVERROR_INVALIDDATA;

  911.         }

  912.         /* sign extend the predictors */

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

  914. 

  915.         /* DK3 ADPCM support macro */

  916. #define DK3_GET_NEXT_NIBBLE() \

  917.     if (decode_top_nibble_next) { \

  918.         nibble = last_byte >> 4; \

  919.         decode_top_nibble_next = 0; \

  920.     } else { \

  921.         last_byte = bytestream2_get_byteu(&gb); \

  922.         nibble = last_byte & 0x0F; \

  923.         decode_top_nibble_next = 1; \

  924.     }

  925. 

  926.         while (samples < samples_end) {

  927. 

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

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

  930. 

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

  932.             DK3_GET_NEXT_NIBBLE();

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

  934. 

  935.             /* process the diff channel predictor */

  936.             DK3_GET_NEXT_NIBBLE();

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

  938. 

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

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

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

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

  943. 

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

  945.             DK3_GET_NEXT_NIBBLE();

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

  947. 

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

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

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

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

  952.         }

  953. 

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

  955.             bytestream2_skip(&gb, 1);

  956.         break;

  957.     }

  958.     case AV_CODEC_ID_ADPCM_IMA_ISS:

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

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

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

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

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

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

  965.                        channel, cs->step_index);

  966.                 return AVERROR_INVALIDDATA;

  967.             }

  968.         }

  969. 

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

  971.             int v1, v2;

  972.             int v = bytestream2_get_byteu(&gb);

  973.             /* nibbles are swapped for mono */

  974.             if (st) {

  975.                 v1 = v >> 4;

  976.                 v2 = v & 0x0F;

  977.             } else {

  978.                 v2 = v >> 4;

  979.                 v1 = v & 0x0F;

  980.             }

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

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

  983.         }

  984.         break;

  985.     case AV_CODEC_ID_ADPCM_IMA_APC:

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

  987.             int v = bytestream2_get_byteu(&gb);

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

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

  990.         }

  991.         break;

  992.     case AV_CODEC_ID_ADPCM_IMA_OKI:

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

  994.             int v = bytestream2_get_byteu(&gb);

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

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

  997.         }

  998.         break;

  999.     case AV_CODEC_ID_ADPCM_IMA_RAD:

  1000.         for (channel = 0; channel < avctx->channels; channel++) {

  1001.             cs = &c->status[channel];

  1002.             cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);

  1003.             cs->predictor  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1004.             if (cs->step_index > 88u){

  1005.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1006.                        channel, cs->step_index);

  1007.                 return AVERROR_INVALIDDATA;

  1008.             }

  1009.         }

  1010.         for (n = 0; n < nb_samples / 2; n++) {

  1011.             int byte[2];

  1012. 

  1013.             byte[0] = bytestream2_get_byteu(&gb);

  1014.             if (st)

  1015.                 byte[1] = bytestream2_get_byteu(&gb);

  1016.             for(channel = 0; channel < avctx->channels; channel++) {

  1017.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] & 0x0F, 3);

  1018.             }

  1019.             for(channel = 0; channel < avctx->channels; channel++) {

  1020.                 *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] >> 4  , 3);

  1021.             }

  1022.         }

  1023.         break;

  1024.     case AV_CODEC_ID_ADPCM_IMA_WS:

  1025.         if (c->vqa_version == 3) {

  1026.             for (channel = 0; channel < avctx->channels; channel++) {

  1027.                 int16_t *smp = samples_p[channel];

  1028. 

  1029.                 for (n = nb_samples / 2; n > 0; n--) {

  1030.                     int v = bytestream2_get_byteu(&gb);

  1031.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1032.                     *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1033.                 }

  1034.             }

  1035.         } else {

  1036.             for (n = nb_samples / 2; n > 0; n--) {

  1037.                 for (channel = 0; channel < avctx->channels; channel++) {

  1038.                     int v = bytestream2_get_byteu(&gb);

  1039.                     *samples++  = adpcm_ima_expand_nibble(&c->status[channel], v >> 4  , 3);

  1040.                     samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);

  1041.                 }

  1042.                 samples += avctx->channels;

  1043.             }

  1044.         }

  1045.         bytestream2_seek(&gb, 0, SEEK_END);

  1046.         break;

  1047.     case AV_CODEC_ID_ADPCM_XA:

  1048.     {

  1049.         int16_t *out0 = samples_p[0];

  1050.         int16_t *out1 = samples_p[1];

  1051.         int samples_per_block = 28 * (3 - avctx->channels) * 4;

  1052.         int sample_offset = 0;

  1053.         while (bytestream2_get_bytes_left(&gb) >= 128) {

  1054.             if ((ret = xa_decode(avctx, out0, out1, buf + bytestream2_tell(&gb),

  1055.                                  &c->status[0], &c->status[1],

  1056.                                  avctx->channels, sample_offset)) < 0)

  1057.                 return ret;

  1058.             bytestream2_skipu(&gb, 128);

  1059.             sample_offset += samples_per_block;

  1060.         }

  1061.         break;

  1062.     }

  1063.     case AV_CODEC_ID_ADPCM_IMA_EA_EACS:

  1064.         for (i=0; i<=st; i++) {

  1065.             c->status[i].step_index = bytestream2_get_le32u(&gb);

  1066.             if (c->status[i].step_index > 88u) {

  1067.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",

  1068.                        i, c->status[i].step_index);

  1069.                 return AVERROR_INVALIDDATA;

  1070.             }

  1071.         }

  1072.         for (i=0; i<=st; i++)

  1073.             c->status[i].predictor  = bytestream2_get_le32u(&gb);

  1074. 

  1075.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1076.             int byte   = bytestream2_get_byteu(&gb);

  1077.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   3);

  1078.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);

  1079.         }

  1080.         break;

  1081.     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

  1082.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1083.             int byte = bytestream2_get_byteu(&gb);

  1084.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],  byte >> 4,   6);

  1085.             *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);

  1086.         }

  1087.         break;

  1088.     case AV_CODEC_ID_ADPCM_EA:

  1089.     {

  1090.         int previous_left_sample, previous_right_sample;

  1091.         int current_left_sample, current_right_sample;

  1092.         int next_left_sample, next_right_sample;

  1093.         int coeff1l, coeff2l, coeff1r, coeff2r;

  1094.         int shift_left, shift_right;

  1095. 

  1096.         /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,

  1097.            each coding 28 stereo samples. */

  1098. 

  1099.         if(avctx->channels != 2)

  1100.             return AVERROR_INVALIDDATA;

  1101. 

  1102.         current_left_sample   = sign_extend(bytestream2_get_le16u(&gb), 16);

  1103.         previous_left_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1104.         current_right_sample  = sign_extend(bytestream2_get_le16u(&gb), 16);

  1105.         previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);

  1106. 

  1107.         for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1108.             int byte = bytestream2_get_byteu(&gb);

  1109.             coeff1l = ea_adpcm_table[ byte >> 4       ];

  1110.             coeff2l = ea_adpcm_table[(byte >> 4  ) + 4];

  1111.             coeff1r = ea_adpcm_table[ byte & 0x0F];

  1112.             coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];

  1113. 

  1114.             byte = bytestream2_get_byteu(&gb);

  1115.             shift_left  = 20 - (byte >> 4);

  1116.             shift_right = 20 - (byte & 0x0F);

  1117. 

  1118.             for (count2 = 0; count2 < 28; count2++) {

  1119.                 byte = bytestream2_get_byteu(&gb);

  1120.                 next_left_sample  = sign_extend(byte >> 4, 4) << shift_left;

  1121.                 next_right_sample = sign_extend(byte,      4) << shift_right;

  1122. 

  1123.                 next_left_sample = (next_left_sample +

  1124.                     (current_left_sample * coeff1l) +

  1125.                     (previous_left_sample * coeff2l) + 0x80) >> 8;

  1126.                 next_right_sample = (next_right_sample +

  1127.                     (current_right_sample * coeff1r) +

  1128.                     (previous_right_sample * coeff2r) + 0x80) >> 8;

  1129. 

  1130.                 previous_left_sample = current_left_sample;

  1131.                 current_left_sample = av_clip_int16(next_left_sample);

  1132.                 previous_right_sample = current_right_sample;

  1133.                 current_right_sample = av_clip_int16(next_right_sample);

  1134.                 *samples++ = current_left_sample;

  1135.                 *samples++ = current_right_sample;

  1136.             }

  1137.         }

  1138. 

  1139.         bytestream2_skip(&gb, 2); // Skip terminating 0x0000

  1140. 

  1141.         break;

  1142.     }

  1143.     case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:

  1144.     {

  1145.         int coeff[2][2], shift[2];

  1146. 

  1147.         for(channel = 0; channel < avctx->channels; channel++) {

  1148.             int byte = bytestream2_get_byteu(&gb);

  1149.             for (i=0; i<2; i++)

  1150.                 coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];

  1151.             shift[channel] = 20 - (byte & 0x0F);

  1152.         }

  1153.         for (count1 = 0; count1 < nb_samples / 2; count1++) {

  1154.             int byte[2];

  1155. 

  1156.             byte[0] = bytestream2_get_byteu(&gb);

  1157.             if (st) byte[1] = bytestream2_get_byteu(&gb);

  1158.             for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */

  1159.                 for(channel = 0; channel < avctx->channels; channel++) {

  1160.                     int sample = sign_extend(byte[channel] >> i, 4) << shift[channel];

  1161.                     sample = (sample +

  1162.                              c->status[channel].sample1 * coeff[channel][0] +

  1163.                              c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;

  1164.                     c->status[channel].sample2 = c->status[channel].sample1;

  1165.                     c->status[channel].sample1 = av_clip_int16(sample);

  1166.                     *samples++ = c->status[channel].sample1;

  1167.                 }

  1168.             }

  1169.         }

  1170.         bytestream2_seek(&gb, 0, SEEK_END);

  1171.         break;

  1172.     }

  1173.     case AV_CODEC_ID_ADPCM_EA_R1:

  1174.     case AV_CODEC_ID_ADPCM_EA_R2:

  1175.     case AV_CODEC_ID_ADPCM_EA_R3: {

  1176.         /* channel numbering

  1177.            2chan: 0=fl, 1=fr

  1178.            4chan: 0=fl, 1=rl, 2=fr, 3=rr

  1179.            6chan: 0=fl, 1=c,  2=fr, 3=rl,  4=rr, 5=sub */

  1180.         const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;

  1181.         int previous_sample, current_sample, next_sample;

  1182.         int coeff1, coeff2;

  1183.         int shift;

  1184.         unsigned int channel;

  1185.         uint16_t *samplesC;

  1186.         int count = 0;

  1187.         int offsets[6];

  1188. 

  1189.         for (channel=0; channel<avctx->channels; channel++)

  1190.             offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :

  1191.                                              bytestream2_get_le32(&gb)) +

  1192.                                (avctx->channels + 1) * 4;

  1193. 

  1194.         for (channel=0; channel<avctx->channels; channel++) {

  1195.             bytestream2_seek(&gb, offsets[channel], SEEK_SET);

  1196.             samplesC = samples_p[channel];

  1197. 

  1198.             if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {

  1199.                 current_sample  = sign_extend(bytestream2_get_le16(&gb), 16);

  1200.                 previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);

  1201.             } else {

  1202.                 current_sample  = c->status[channel].predictor;

  1203.                 previous_sample = c->status[channel].prev_sample;

  1204.             }

  1205. 

  1206.             for (count1 = 0; count1 < nb_samples / 28; count1++) {

  1207.                 int byte = bytestream2_get_byte(&gb);

  1208.                 if (byte == 0xEE) {  /* only seen in R2 and R3 */

  1209.                     current_sample  = sign_extend(bytestream2_get_be16(&gb), 16);

  1210.                     previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);

  1211. 

  1212.                     for (count2=0; count2<28; count2++)

  1213.                         *samplesC++ = sign_extend(bytestream2_get_be16(&gb), 16);

  1214.                 } else {

  1215.                     coeff1 = ea_adpcm_table[ byte >> 4     ];

  1216.                     coeff2 = ea_adpcm_table[(byte >> 4) + 4];

  1217.                     shift = 20 - (byte & 0x0F);

  1218. 

  1219.                     for (count2=0; count2<28; count2++) {

  1220.                         if (count2 & 1)

  1221.                             next_sample = sign_extend(byte,    4) << shift;

  1222.                         else {

  1223.                             byte = bytestream2_get_byte(&gb);

  1224.                             next_sample = sign_extend(byte >> 4, 4) << shift;

  1225.                         }

  1226. 

  1227.                         next_sample += (current_sample  * coeff1) +

  1228.                                        (previous_sample * coeff2);

  1229.                         next_sample = av_clip_int16(next_sample >> 8);

  1230. 

  1231.                         previous_sample = current_sample;

  1232.                         current_sample  = next_sample;

  1233.                         *samplesC++ = current_sample;

  1234.                     }

  1235.                 }

  1236.             }

  1237.             if (!count) {

  1238.                 count = count1;

  1239.             } else if (count != count1) {

  1240.                 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");

  1241.                 count = FFMAX(count, count1);

  1242.             }

  1243. 

  1244.             if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {

  1245.                 c->status[channel].predictor   = current_sample;

  1246.                 c->status[channel].prev_sample = previous_sample;

  1247.             }

  1248.         }

  1249. 

  1250.         frame->nb_samples = count * 28;

  1251.         bytestream2_seek(&gb, 0, SEEK_END);

  1252.         break;

  1253.     }

  1254.     case AV_CODEC_ID_ADPCM_EA_XAS:

  1255.         for (channel=0; channel<avctx->channels; channel++) {

  1256.             int coeff[2][4], shift[4];

  1257.             int16_t *s = samples_p[channel];

  1258.             for (n = 0; n < 4; n++, s += 32) {

  1259.                 int val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1260.                 for (i=0; i<2; i++)

  1261.                     coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];

  1262.                 s[0] = val & ~0x0F;

  1263. 

  1264.                 val = sign_extend(bytestream2_get_le16u(&gb), 16);

  1265.                 shift[n] = 20 - (val & 0x0F);

  1266.                 s[1] = val & ~0x0F;

  1267.             }

  1268. 

  1269.             for (m=2; m<32; m+=2) {

  1270.                 s = &samples_p[channel][m];

  1271.                 for (n = 0; n < 4; n++, s += 32) {

  1272.                     int level, pred;

  1273.                     int byte = bytestream2_get_byteu(&gb);

  1274. 

  1275.                     level = sign_extend(byte >> 4, 4) << shift[n];

  1276.                     pred  = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];

  1277.                     s[0]  = av_clip_int16((level + pred + 0x80) >> 8);

  1278. 

  1279.                     level = sign_extend(byte, 4) << shift[n];

  1280.                     pred  = s[0] * coeff[0][n] + s[-1] * coeff[1][n];

  1281.                     s[1]  = av_clip_int16((level + pred + 0x80) >> 8);

  1282.                 }

  1283.             }

  1284.         }

  1285.         break;

  1286.     case AV_CODEC_ID_ADPCM_IMA_AMV:

  1287.         c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);

  1288.         c->status[0].step_index = bytestream2_get_le16u(&gb);

  1289.         bytestream2_skipu(&gb, 4);

  1290.         if (c->status[0].step_index > 88u) {

  1291.             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1292.                    c->status[0].step_index);

  1293.             return AVERROR_INVALIDDATA;

  1294.         }

  1295. 

  1296.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1297.             int v = bytestream2_get_byteu(&gb);

  1298. 

  1299.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);

  1300.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);

  1301.         }

  1302.         break;

  1303.     case AV_CODEC_ID_ADPCM_IMA_SMJPEG:

  1304.         for (i = 0; i < avctx->channels; i++) {

  1305.             c->status[i].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);

  1306.             c->status[i].step_index = bytestream2_get_byteu(&gb);

  1307.             bytestream2_skipu(&gb, 1);

  1308.             if (c->status[i].step_index > 88u) {

  1309.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",

  1310.                        c->status[i].step_index);

  1311.                 return AVERROR_INVALIDDATA;

  1312.             }

  1313.         }

  1314. 

  1315.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1316.             int v = bytestream2_get_byteu(&gb);

  1317. 

  1318.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[0 ], v >> 4, 3);

  1319.             *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0xf, 3);

  1320.         }

  1321.         break;

  1322.     case AV_CODEC_ID_ADPCM_CT:

  1323.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1324.             int v = bytestream2_get_byteu(&gb);

  1325.             *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4  );

  1326.             *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);

  1327.         }

  1328.         break;

  1329.     case AV_CODEC_ID_ADPCM_SBPRO_4:

  1330.     case AV_CODEC_ID_ADPCM_SBPRO_3:

  1331.     case AV_CODEC_ID_ADPCM_SBPRO_2:

  1332.         if (!c->status[0].step_index) {

  1333.             /* the first byte is a raw sample */

  1334.             *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1335.             if (st)

  1336.                 *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);

  1337.             c->status[0].step_index = 1;

  1338.             nb_samples--;

  1339.         }

  1340.         if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {

  1341.             for (n = nb_samples >> (1 - st); n > 0; n--) {

  1342.                 int byte = bytestream2_get_byteu(&gb);

  1343.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1344.                                                        byte >> 4,   4, 0);

  1345.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1346.                                                        byte & 0x0F, 4, 0);

  1347.             }

  1348.         } else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {

  1349.             for (n = (nb_samples<<st) / 3; n > 0; n--) {

  1350.                 int byte = bytestream2_get_byteu(&gb);

  1351.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1352.                                                         byte >> 5        , 3, 0);

  1353.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1354.                                                        (byte >> 2) & 0x07, 3, 0);

  1355.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1356.                                                         byte & 0x03,       2, 0);

  1357.             }

  1358.         } else {

  1359.             for (n = nb_samples >> (2 - st); n > 0; n--) {

  1360.                 int byte = bytestream2_get_byteu(&gb);

  1361.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1362.                                                         byte >> 6        , 2, 2);

  1363.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1364.                                                        (byte >> 4) & 0x03, 2, 2);

  1365.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1366.                                                        (byte >> 2) & 0x03, 2, 2);

  1367.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1368.                                                         byte & 0x03,       2, 2);

  1369.             }

  1370.         }

  1371.         break;

  1372.     case AV_CODEC_ID_ADPCM_SWF:

  1373.         adpcm_swf_decode(avctx, buf, buf_size, samples);

  1374.         bytestream2_seek(&gb, 0, SEEK_END);

  1375.         break;

  1376.     case AV_CODEC_ID_ADPCM_YAMAHA:

  1377.         for (n = nb_samples >> (1 - st); n > 0; n--) {

  1378.             int v = bytestream2_get_byteu(&gb);

  1379.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);

  1380.             *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4  );

  1381.         }

  1382.         break;

  1383.     case AV_CODEC_ID_ADPCM_AFC:

  1384.     {

  1385.         int samples_per_block;

  1386.         int blocks;

  1387. 

  1388.         if (avctx->extradata && avctx->extradata_size == 1 && avctx->extradata[0]) {

  1389.             samples_per_block = avctx->extradata[0] / 16;

  1390.             blocks = nb_samples / avctx->extradata[0];

  1391.         } else {

  1392.             samples_per_block = nb_samples / 16;

  1393.             blocks = 1;

  1394.         }

  1395. 

  1396.         for (m = 0; m < blocks; m++) {

  1397.         for (channel = 0; channel < avctx->channels; channel++) {

  1398.             int prev1 = c->status[channel].sample1;

  1399.             int prev2 = c->status[channel].sample2;

  1400. 

  1401.             samples = samples_p[channel] + m * 16;

  1402.             /* Read in every sample for this channel.  */

  1403.             for (i = 0; i < samples_per_block; i++) {

  1404.                 int byte = bytestream2_get_byteu(&gb);

  1405.                 int scale = 1 << (byte >> 4);

  1406.                 int index = byte & 0xf;

  1407.                 int factor1 = ff_adpcm_afc_coeffs[0][index];

  1408.                 int factor2 = ff_adpcm_afc_coeffs[1][index];

  1409. 

  1410.                 /* Decode 16 samples.  */

  1411.                 for (n = 0; n < 16; n++) {

  1412.                     int32_t sampledat;

  1413. 

  1414.                     if (n & 1) {

  1415.                         sampledat = sign_extend(byte, 4);

  1416.                     } else {

  1417.                         byte = bytestream2_get_byteu(&gb);

  1418.                         sampledat = sign_extend(byte >> 4, 4);

  1419.                     }

  1420. 

  1421.                     sampledat = ((prev1 * factor1 + prev2 * factor2) +

  1422.                                  ((sampledat * scale) << 11)) >> 11;

  1423.                     *samples = av_clip_int16(sampledat);

  1424.                     prev2 = prev1;

  1425.                     prev1 = *samples++;

  1426.                 }

  1427.             }

  1428. 

  1429.             c->status[channel].sample1 = prev1;

  1430.             c->status[channel].sample2 = prev2;

  1431.         }

  1432.         }

  1433.         bytestream2_seek(&gb, 0, SEEK_END);

  1434.         break;

  1435.     }

  1436.     case AV_CODEC_ID_ADPCM_THP:

  1437.     case AV_CODEC_ID_ADPCM_THP_LE:

  1438.     {

  1439.         int table[14][16];

  1440.         int ch;

  1441. 

  1442. #define THP_GET16(g) \

  1443.     sign_extend( \

  1444.         avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE ? \

  1445.         bytestream2_get_le16u(&(g)) : \

  1446.         bytestream2_get_be16u(&(g)), 16)

  1447. 

  1448.         if (avctx->extradata) {

  1449.             GetByteContext tb;

  1450.             if (avctx->extradata_size < 32 * avctx->channels) {

  1451.                 av_log(avctx, AV_LOG_ERROR, "Missing coeff table\n");

  1452.                 return AVERROR_INVALIDDATA;

  1453.             }

  1454. 

  1455.             bytestream2_init(&tb, avctx->extradata, avctx->extradata_size);

  1456.             for (i = 0; i < avctx->channels; i++)

  1457.                 for (n = 0; n < 16; n++)

  1458.                     table[i][n] = THP_GET16(tb);

  1459.         } else {

  1460.             for (i = 0; i < avctx->channels; i++)

  1461.                 for (n = 0; n < 16; n++)

  1462.                     table[i][n] = THP_GET16(gb);

  1463. 

  1464.             if (!c->has_status) {

  1465.                 /* Initialize the previous sample.  */

  1466.                 for (i = 0; i < avctx->channels; i++) {

  1467.                     c->status[i].sample1 = THP_GET16(gb);

  1468.                     c->status[i].sample2 = THP_GET16(gb);

  1469.                 }

  1470.                 c->has_status = 1;

  1471.             } else {

  1472.                 bytestream2_skip(&gb, avctx->channels * 4);

  1473.             }

  1474.         }

  1475. 

  1476.         for (ch = 0; ch < avctx->channels; ch++) {

  1477.             samples = samples_p[ch];

  1478. 

  1479.             /* Read in every sample for this channel.  */

  1480.             for (i = 0; i < (nb_samples + 13) / 14; i++) {

  1481.                 int byte = bytestream2_get_byteu(&gb);

  1482.                 int index = (byte >> 4) & 7;

  1483.                 unsigned int exp = byte & 0x0F;

  1484.                 int factor1 = table[ch][index * 2];

  1485.                 int factor2 = table[ch][index * 2 + 1];

  1486. 

  1487.                 /* Decode 14 samples.  */

  1488.                 for (n = 0; n < 14 && (i * 14 + n < nb_samples); n++) {

  1489.                     int32_t sampledat;

  1490. 

  1491.                     if (n & 1) {

  1492.                         sampledat = sign_extend(byte, 4);

  1493.                     } else {

  1494.                         byte = bytestream2_get_byteu(&gb);

  1495.                         sampledat = sign_extend(byte >> 4, 4);

  1496.                     }

  1497. 

  1498.                     sampledat = ((c->status[ch].sample1 * factor1

  1499.                                 + c->status[ch].sample2 * factor2) >> 11) + (sampledat << exp);

  1500.                     *samples = av_clip_int16(sampledat);

  1501.                     c->status[ch].sample2 = c->status[ch].sample1;

  1502.                     c->status[ch].sample1 = *samples++;

  1503.                 }

  1504.             }

  1505.         }

  1506.         break;

  1507.     }

  1508.     case AV_CODEC_ID_ADPCM_DTK:

  1509.         for (channel = 0; channel < avctx->channels; channel++) {

  1510.             samples = samples_p[channel];

  1511. 

  1512.             /* Read in every sample for this channel.  */

  1513.             for (i = 0; i < nb_samples / 28; i++) {

  1514.                 int byte, header;

  1515.                 if (channel)

  1516.                     bytestream2_skipu(&gb, 1);

  1517.                 header = bytestream2_get_byteu(&gb);

  1518.                 bytestream2_skipu(&gb, 3 - channel);

  1519. 

  1520.                 /* Decode 28 samples.  */

  1521.                 for (n = 0; n < 28; n++) {

  1522.                     int32_t sampledat, prev;

  1523. 

  1524.                     switch (header >> 4) {

  1525.                     case 1:

  1526.                         prev = (c->status[channel].sample1 * 0x3c);

  1527.                         break;

  1528.                     case 2:

  1529.                         prev = (c->status[channel].sample1 * 0x73) - (c->status[channel].sample2 * 0x34);

  1530.                         break;

  1531.                     case 3:

  1532.                         prev = (c->status[channel].sample1 * 0x62) - (c->status[channel].sample2 * 0x37);

  1533.                         break;

  1534.                     default:

  1535.                         prev = 0;

  1536.                     }

  1537. 

  1538.                     prev = av_clip_intp2((prev + 0x20) >> 6, 21);

  1539. 

  1540.                     byte = bytestream2_get_byteu(&gb);

  1541.                     if (!channel)

  1542.                         sampledat = sign_extend(byte, 4);

  1543.                     else

  1544.                         sampledat = sign_extend(byte >> 4, 4);

  1545. 

  1546.                     sampledat = (((sampledat << 12) >> (header & 0xf)) << 6) + prev;

  1547.                     *samples++ = av_clip_int16(sampledat >> 6);

  1548.                     c->status[channel].sample2 = c->status[channel].sample1;

  1549.                     c->status[channel].sample1 = sampledat;

  1550.                 }

  1551.             }

  1552.             if (!channel)

  1553.                 bytestream2_seek(&gb, 0, SEEK_SET);

  1554.         }

  1555.         break;

  1556.     case AV_CODEC_ID_ADPCM_PSX:

  1557.         for (channel = 0; channel < avctx->channels; channel++) {

  1558.             samples = samples_p[channel];

  1559. 

  1560.             /* Read in every sample for this channel.  */

  1561.             for (i = 0; i < nb_samples / 28; i++) {

  1562.                 int filter, shift, flag, byte;

  1563. 

  1564.                 filter = bytestream2_get_byteu(&gb);

  1565.                 shift  = filter & 0xf;

  1566.                 filter = filter >> 4;

  1567.                 if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table))

  1568.                     return AVERROR_INVALIDDATA;

  1569.                 flag   = bytestream2_get_byteu(&gb);

  1570. 

  1571.                 /* Decode 28 samples.  */

  1572.                 for (n = 0; n < 28; n++) {

  1573.                     int sample = 0, scale;

  1574. 

  1575.                     if (flag < 0x07) {

  1576.                         if (n & 1) {

  1577.                             scale = sign_extend(byte >> 4, 4);

  1578.                         } else {

  1579.                             byte  = bytestream2_get_byteu(&gb);

  1580.                             scale = sign_extend(byte, 4);

  1581.                         }

  1582. 

  1583.                         scale  = scale << 12;

  1584.                         sample = (int)((scale >> shift) + (c->status[channel].sample1 * xa_adpcm_table[filter][0] + c->status[channel].sample2 * xa_adpcm_table[filter][1]) / 64);

  1585.                     }

  1586.                     *samples++ = av_clip_int16(sample);

  1587.                     c->status[channel].sample2 = c->status[channel].sample1;

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

  1589.                 }

  1590.             }

  1591.         }

  1592.         break;

  1593. 

  1594.     default:

  1595.         return -1;

  1596.     }

  1597. 

  1598.     if (avpkt->size && bytestream2_tell(&gb) == 0) {

  1599.         av_log(avctx, AV_LOG_ERROR, "Nothing consumed\n");

  1600.         return AVERROR_INVALIDDATA;

  1601.     }

  1602. 

  1603.     *got_frame_ptr = 1;

  1604. 

  1605.     if (avpkt->size < bytestream2_tell(&gb)) {

  1606.         av_log(avctx, AV_LOG_ERROR, "Overread of %d < %d\n", avpkt->size, bytestream2_tell(&gb));

  1607.         return avpkt->size;

  1608.     }

  1609. 

  1610.     return bytestream2_tell(&gb);

  1611. }

  1612. 

  1613. static void adpcm_flush(AVCodecContext *avctx)

  1614. {

  1615.     ADPCMDecodeContext *c = avctx->priv_data;

  1616.     c->has_status = 0;

  1617. }

  1618. 

  1619. 

  1620. static const enum AVSampleFormat sample_fmts_s16[]  = { AV_SAMPLE_FMT_S16,

  1621.                                                         AV_SAMPLE_FMT_NONE };

  1622. static const enum AVSampleFormat sample_fmts_s16p[] = { AV_SAMPLE_FMT_S16P,

  1623.                                                         AV_SAMPLE_FMT_NONE };

  1624. static const enum AVSampleFormat sample_fmts_both[] = { AV_SAMPLE_FMT_S16,

  1625.                                                         AV_SAMPLE_FMT_S16P,

  1626.                                                         AV_SAMPLE_FMT_NONE };

  1627. 

  1628. #define ADPCM_DECODER(id_, sample_fmts_, name_, long_name_) \

  1629. AVCodec ff_ ## name_ ## _decoder = {                        \

  1630.     .name           = #name_,                               \

  1631.     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \

  1632.     .type           = AVMEDIA_TYPE_AUDIO,                   \

  1633.     .id             = id_,                                  \

  1634.     .priv_data_size = sizeof(ADPCMDecodeContext),           \

  1635.     .init           = adpcm_decode_init,                    \

  1636.     .decode         = adpcm_decode_frame,                   \

  1637.     .flush          = adpcm_flush,                          \

  1638.     .capabilities   = AV_CODEC_CAP_DR1,                     \

  1639.     .sample_fmts    = sample_fmts_,                         \

  1640. }

  1641. 

  1642. /* Note: Do not forget to add new entries to the Makefile as well. */

  1643. ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM,         sample_fmts_s16p, adpcm_4xm,         "ADPCM 4X Movie");

  1644. ADPCM_DECODER(AV_CODEC_ID_ADPCM_AFC,         sample_fmts_s16p, adpcm_afc,         "ADPCM Nintendo Gamecube AFC");

  1645. ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT,          sample_fmts_s16,  adpcm_ct,          "ADPCM Creative Technology");

  1646. ADPCM_DECODER(AV_CODEC_ID_ADPCM_DTK,         sample_fmts_s16p, adpcm_dtk,         "ADPCM Nintendo Gamecube DTK");

  1647. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA,          sample_fmts_s16,  adpcm_ea,          "ADPCM Electronic Arts");

  1648. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, sample_fmts_s16,  adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");

  1649. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1,       sample_fmts_s16p, adpcm_ea_r1,       "ADPCM Electronic Arts R1");

  1650. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2,       sample_fmts_s16p, adpcm_ea_r2,       "ADPCM Electronic Arts R2");

  1651. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3,       sample_fmts_s16p, adpcm_ea_r3,       "ADPCM Electronic Arts R3");

  1652. ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS,      sample_fmts_s16p, adpcm_ea_xas,      "ADPCM Electronic Arts XAS");

  1653. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV,     sample_fmts_s16,  adpcm_ima_amv,     "ADPCM IMA AMV");

  1654. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC,     sample_fmts_s16,  adpcm_ima_apc,     "ADPCM IMA CRYO APC");

  1655. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3,     sample_fmts_s16,  adpcm_ima_dk3,     "ADPCM IMA Duck DK3");

  1656. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4,     sample_fmts_s16,  adpcm_ima_dk4,     "ADPCM IMA Duck DK4");

  1657. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, sample_fmts_s16,  adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");

  1658. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, sample_fmts_s16,  adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");

  1659. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS,     sample_fmts_s16,  adpcm_ima_iss,     "ADPCM IMA Funcom ISS");

  1660. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI,     sample_fmts_s16,  adpcm_ima_oki,     "ADPCM IMA Dialogic OKI");

  1661. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT,      sample_fmts_s16p, adpcm_ima_qt,      "ADPCM IMA QuickTime");

  1662. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_RAD,     sample_fmts_s16,  adpcm_ima_rad,     "ADPCM IMA Radical");

  1663. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG,  sample_fmts_s16,  adpcm_ima_smjpeg,  "ADPCM IMA Loki SDL MJPEG");

  1664. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV,     sample_fmts_s16p, adpcm_ima_wav,     "ADPCM IMA WAV");

  1665. ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS,      sample_fmts_both, adpcm_ima_ws,      "ADPCM IMA Westwood");

  1666. ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS,          sample_fmts_s16,  adpcm_ms,          "ADPCM Microsoft");

  1667. ADPCM_DECODER(AV_CODEC_ID_ADPCM_PSX,         sample_fmts_s16p, adpcm_psx,         "ADPCM PSX");

  1668. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2,     sample_fmts_s16,  adpcm_sbpro_2,     "ADPCM Sound Blaster Pro 2-bit");

  1669. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3,     sample_fmts_s16,  adpcm_sbpro_3,     "ADPCM Sound Blaster Pro 2.6-bit");

  1670. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4,     sample_fmts_s16,  adpcm_sbpro_4,     "ADPCM Sound Blaster Pro 4-bit");

  1671. ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF,         sample_fmts_s16,  adpcm_swf,         "ADPCM Shockwave Flash");

  1672. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP_LE,      sample_fmts_s16p, adpcm_thp_le,      "ADPCM Nintendo THP (little-endian)");

  1673. ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP,         sample_fmts_s16p, adpcm_thp,         "ADPCM Nintendo THP");

  1674. ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA,          sample_fmts_s16p, adpcm_xa,          "ADPCM CDROM XA");

  1675. ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA,      sample_fmts_s16,  adpcm_yamaha,      "ADPCM Yamaha");