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FFmpeg/libavcodec/adpcm.c

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  1. /*

  2.  * Copyright (c) 2001-2003 The ffmpeg Project

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. #include "avcodec.h"

  21. #include "get_bits.h"

  22. #include "put_bits.h"

  23. #include "bytestream.h"

  24. #include "adpcm.h"

  25. #include "adpcm_data.h"

  26. 

  27. /**

  28.  * @file

  29.  * ADPCM decoders

  30.  * First version by Francois Revol (revol@free.fr)

  31.  * Fringe ADPCM codecs (e.g., DK3, DK4, Westwood)

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

  33.  * CD-ROM XA ADPCM codec by BERO

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

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

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

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

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

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

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

  41.  *

  42.  * Features and limitations:

  43.  *

  44.  * Reference documents:

  45.  * http://www.pcisys.net/~melanson/codecs/simpleaudio.html

  46.  * http://www.geocities.com/SiliconValley/8682/aud3.txt

  47.  * http://openquicktime.sourceforge.net/plugins.htm

  48.  * XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html

  49.  * http://www.cs.ucla.edu/~leec/mediabench/applications.html

  50.  * SoX source code http://home.sprynet.com/~cbagwell/sox.html

  51.  *

  52.  * CD-ROM XA:

  53.  * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html

  54.  * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html

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

  56.  */

  57. 

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

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

  60.    {   0,   0 },

  61.    {  60,   0 },

  62.    { 115, -52 },

  63.    {  98, -55 },

  64.    { 122, -60 }

  65. };

  66. 

  67. static const int ea_adpcm_table[] = {

  68.     0, 240, 460, 392, 0, 0, -208, -220, 0, 1,

  69.     3, 4, 7, 8, 10, 11, 0, -1, -3, -4

  70. };

  71. 

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

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

  74.     /*2*/ { -1, 2 },

  75.     /*3*/ { -1, -1, 2, 4 },

  76.     /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },

  77.     /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }

  78. };

  79. 

  80. /* end of tables */

  81. 

  82. typedef struct ADPCMDecodeContext {

  83.     ADPCMChannelStatus status[6];

  84. } ADPCMDecodeContext;

  85. 

  86. static av_cold int adpcm_decode_init(AVCodecContext * avctx)

  87. {

  88.     ADPCMDecodeContext *c = avctx->priv_data;

  89.     unsigned int max_channels = 2;

  90. 

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

  92.     case CODEC_ID_ADPCM_EA_R1:

  93.     case CODEC_ID_ADPCM_EA_R2:

  94.     case CODEC_ID_ADPCM_EA_R3:

  95.     case CODEC_ID_ADPCM_EA_XAS:

  96.         max_channels = 6;

  97.         break;

  98.     }

  99.     if(avctx->channels > max_channels){

  100.         return -1;

  101.     }

  102. 

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

  104.     case CODEC_ID_ADPCM_CT:

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

  106.         break;

  107.     case CODEC_ID_ADPCM_IMA_WAV:

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

  109.             av_log(avctx, AV_LOG_ERROR, "Only 4-bit ADPCM IMA WAV files are supported\n");

  110.             return -1;

  111.         }

  112.         break;

  113.     case CODEC_ID_ADPCM_IMA_WS:

  114.         if (avctx->extradata && avctx->extradata_size == 2 * 4) {

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

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

  117.         }

  118.         break;

  119.     default:

  120.         break;

  121.     }

  122.     avctx->sample_fmt = AV_SAMPLE_FMT_S16;

  123.     return 0;

  124. }

  125. 

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

  127. {

  128.     int step_index;

  129.     int predictor;

  130.     int sign, delta, diff, step;

  131. 

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

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

  134.     if (step_index < 0) step_index = 0;

  135.     else if (step_index > 88) step_index = 88;

  136. 

  137.     sign = nibble & 8;

  138.     delta = nibble & 7;

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

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

  141.      * quickly enough */

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

  143.     predictor = c->predictor;

  144.     if (sign) predictor -= diff;

  145.     else predictor += diff;

  146. 

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

  148.     c->step_index = step_index;

  149. 

  150.     return (short)c->predictor;

  151. }

  152. 

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

  154. {

  155.     int step_index;

  156.     int predictor;

  157.     int diff, step;

  158. 

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

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

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

  162. 

  163.     diff = step >> 3;

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

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

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

  167. 

  168.     if (nibble & 8)

  169.         predictor = c->predictor - diff;

  170.     else

  171.         predictor = c->predictor + diff;

  172. 

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

  174.     c->step_index = step_index;

  175. 

  176.     return c->predictor;

  177. }

  178. 

  179. static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)

  180. {

  181.     int predictor;

  182. 

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

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

  185. 

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

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

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

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

  190. 

  191.     return c->sample1;

  192. }

  193. 

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

  195. {

  196.     int sign, delta, diff;

  197.     int new_step;

  198. 

  199.     sign = nibble & 8;

  200.     delta = nibble & 7;

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

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

  203.      * quickly enough */

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

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

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

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

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

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

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

  211. 

  212.     return (short)c->predictor;

  213. }

  214. 

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

  216. {

  217.     int sign, delta, diff;

  218. 

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

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

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

  222. 

  223.     /* clamp result */

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

  225. 

  226.     /* calculate new step */

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

  228.         c->step++;

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

  230.         c->step--;

  231. 

  232.     return (short) c->predictor;

  233. }

  234. 

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

  236. {

  237.     if(!c->step) {

  238.         c->predictor = 0;

  239.         c->step = 127;

  240.     }

  241. 

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

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

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

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

  246.     return c->predictor;

  247. }

  248. 

  249. static void xa_decode(short *out, const unsigned char *in,

  250.     ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)

  251. {

  252.     int i, j;

  253.     int shift,filter,f0,f1;

  254.     int s_1,s_2;

  255.     int d,s,t;

  256. 

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

  258. 

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

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

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

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

  263. 

  264.         s_1 = left->sample1;

  265.         s_2 = left->sample2;

  266. 

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

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

  269. 

  270.             t = (signed char)(d<<4)>>4;

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

  272.             s_2 = s_1;

  273.             s_1 = av_clip_int16(s);

  274.             *out = s_1;

  275.             out += inc;

  276.         }

  277. 

  278.         if (inc==2) { /* stereo */

  279.             left->sample1 = s_1;

  280.             left->sample2 = s_2;

  281.             s_1 = right->sample1;

  282.             s_2 = right->sample2;

  283.             out = out + 1 - 28*2;

  284.         }

  285. 

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

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

  288. 

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

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

  291. 

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

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

  294. 

  295.             t = (signed char)d >> 4;

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

  297.             s_2 = s_1;

  298.             s_1 = av_clip_int16(s);

  299.             *out = s_1;

  300.             out += inc;

  301.         }

  302. 

  303.         if (inc==2) { /* stereo */

  304.             right->sample1 = s_1;

  305.             right->sample2 = s_2;

  306.             out -= 1;

  307.         } else {

  308.             left->sample1 = s_1;

  309.             left->sample2 = s_2;

  310.         }

  311.     }

  312. }

  313. 

  314. 

  315. /* DK3 ADPCM support macro */

  316. #define DK3_GET_NEXT_NIBBLE() \

  317.     if (decode_top_nibble_next) \

  318.     { \

  319.         nibble = last_byte >> 4; \

  320.         decode_top_nibble_next = 0; \

  321.     } \

  322.     else \

  323.     { \

  324.         last_byte = *src++; \

  325.         if (src >= buf + buf_size) break; \

  326.         nibble = last_byte & 0x0F; \

  327.         decode_top_nibble_next = 1; \

  328.     }

  329. 

  330. static int adpcm_decode_frame(AVCodecContext *avctx,

  331.                             void *data, int *data_size,

  332.                             AVPacket *avpkt)

  333. {

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

  335.     int buf_size = avpkt->size;

  336.     ADPCMDecodeContext *c = avctx->priv_data;

  337.     ADPCMChannelStatus *cs;

  338.     int n, m, channel, i;

  339.     int block_predictor[2];

  340.     short *samples;

  341.     short *samples_end;

  342.     const uint8_t *src;

  343.     int st; /* stereo */

  344. 

  345.     /* DK3 ADPCM accounting variables */

  346.     unsigned char last_byte = 0;

  347.     unsigned char nibble;

  348.     int decode_top_nibble_next = 0;

  349.     int diff_channel;

  350. 

  351.     /* EA ADPCM state variables */

  352.     uint32_t samples_in_chunk;

  353.     int32_t previous_left_sample, previous_right_sample;

  354.     int32_t current_left_sample, current_right_sample;

  355.     int32_t next_left_sample, next_right_sample;

  356.     int32_t coeff1l, coeff2l, coeff1r, coeff2r;

  357.     uint8_t shift_left, shift_right;

  358.     int count1, count2;

  359.     int coeff[2][2], shift[2];//used in EA MAXIS ADPCM

  360. 

  361.     if (!buf_size)

  362.         return 0;

  363. 

  364.     //should protect all 4bit ADPCM variants

  365.     //8 is needed for CODEC_ID_ADPCM_IMA_WAV with 2 channels

  366.     //

  367.     if(*data_size/4 < buf_size + 8)

  368.         return -1;

  369. 

  370.     samples = data;

  371.     samples_end= samples + *data_size/2;

  372.     *data_size= 0;

  373.     src = buf;

  374. 

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

  376. 

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

  378.     case CODEC_ID_ADPCM_IMA_QT:

  379.         n = buf_size - 2*avctx->channels;

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

  381.             int16_t predictor;

  382.             int step_index;

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

  384.             /* (pppppp) (piiiiiii) */

  385. 

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

  387.             predictor = AV_RB16(src);

  388.             step_index = predictor & 0x7F;

  389.             predictor &= 0xFF80;

  390. 

  391.             src += 2;

  392. 

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

  394.                 int diff = (int)predictor - cs->predictor;

  395.                 if (diff < 0)

  396.                     diff = - diff;

  397.                 if (diff > 0x7f)

  398.                     goto update;

  399.             } else {

  400.             update:

  401.                 cs->step_index = step_index;

  402.                 cs->predictor = predictor;

  403.             }

  404. 

  405.             if (cs->step_index > 88){

  406.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);

  407.                 cs->step_index = 88;

  408.             }

  409. 

  410.             samples = (short*)data + channel;

  411. 

  412.             for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */

  413.                 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] & 0x0F, 3);

  414.                 samples += avctx->channels;

  415.                 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] >> 4  , 3);

  416.                 samples += avctx->channels;

  417.                 src ++;

  418.             }

  419.         }

  420.         if (st)

  421.             samples--;

  422.         break;

  423.     case CODEC_ID_ADPCM_IMA_WAV:

  424.         if (avctx->block_align != 0 && buf_size > avctx->block_align)

  425.             buf_size = avctx->block_align;

  426. 

  427. //        samples_per_block= (block_align-4*chanels)*8 / (bits_per_sample * chanels) + 1;

  428. 

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

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

  431.             cs->predictor = *samples++ = (int16_t)bytestream_get_le16(&src);

  432. 

  433.             cs->step_index = *src++;

  434.             if (cs->step_index > 88){

  435.                 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);

  436.                 cs->step_index = 88;

  437.             }

  438.             if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]); /* unused */

  439.         }

  440. 

  441.         while(src < buf + buf_size){

  442.             for(m=0; m<4; m++){

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

  444.                     *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] & 0x0F, 3);

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

  446.                     *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] >> 4  , 3);

  447.                 src++;

  448.             }

  449.             src += 4*st;

  450.         }

  451.         break;

  452.     case CODEC_ID_ADPCM_4XM:

  453.         cs = &(c->status[0]);

  454.         c->status[0].predictor= (int16_t)bytestream_get_le16(&src);

  455.         if(st){

  456.             c->status[1].predictor= (int16_t)bytestream_get_le16(&src);

  457.         }

  458.         c->status[0].step_index= (int16_t)bytestream_get_le16(&src);

  459.         if(st){

  460.             c->status[1].step_index= (int16_t)bytestream_get_le16(&src);

  461.         }

  462.         if (cs->step_index < 0) cs->step_index = 0;

  463.         if (cs->step_index > 88) cs->step_index = 88;

  464. 

  465.         m= (buf_size - (src - buf))>>st;

  466.         for(i=0; i<m; i++) {

  467.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);

  468.             if (st)

  469.                 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] & 0x0F, 4);

  470.             *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] >> 4, 4);

  471.             if (st)

  472.                 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);

  473.         }

  474. 

  475.         src += m<<st;

  476. 

  477.         break;

  478.     case CODEC_ID_ADPCM_MS:

  479.         if (avctx->block_align != 0 && buf_size > avctx->block_align)

  480.             buf_size = avctx->block_align;

  481.         n = buf_size - 7 * avctx->channels;

  482.         if (n < 0)

  483.             return -1;

  484.         block_predictor[0] = av_clip(*src++, 0, 6);

  485.         block_predictor[1] = 0;

  486.         if (st)

  487.             block_predictor[1] = av_clip(*src++, 0, 6);

  488.         c->status[0].idelta = (int16_t)bytestream_get_le16(&src);

  489.         if (st){

  490.             c->status[1].idelta = (int16_t)bytestream_get_le16(&src);

  491.         }

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

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

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

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

  496. 

  497.         c->status[0].sample1 = bytestream_get_le16(&src);

  498.         if (st) c->status[1].sample1 = bytestream_get_le16(&src);

  499.         c->status[0].sample2 = bytestream_get_le16(&src);

  500.         if (st) c->status[1].sample2 = bytestream_get_le16(&src);

  501. 

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

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

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

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

  506.         for(;n>0;n--) {

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

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

  509.             src ++;

  510.         }

  511.         break;

  512.     case CODEC_ID_ADPCM_IMA_DK4:

  513.         if (avctx->block_align != 0 && buf_size > avctx->block_align)

  514.             buf_size = avctx->block_align;

  515. 

  516.         c->status[0].predictor  = (int16_t)bytestream_get_le16(&src);

  517.         c->status[0].step_index = *src++;

  518.         src++;

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

  520.         if (st) {

  521.             c->status[1].predictor  = (int16_t)bytestream_get_le16(&src);

  522.             c->status[1].step_index = *src++;

  523.             src++;

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

  525.         }

  526.         while (src < buf + buf_size) {

  527. 

  528.             /* take care of the top nibble (always left or mono channel) */

  529.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  530.                 src[0] >> 4, 3);

  531. 

  532.             /* take care of the bottom nibble, which is right sample for

  533.              * stereo, or another mono sample */

  534.             if (st)

  535.                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],

  536.                     src[0] & 0x0F, 3);

  537.             else

  538.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  539.                     src[0] & 0x0F, 3);

  540. 

  541.             src++;

  542.         }

  543.         break;

  544.     case CODEC_ID_ADPCM_IMA_DK3:

  545.         if (avctx->block_align != 0 && buf_size > avctx->block_align)

  546.             buf_size = avctx->block_align;

  547. 

  548.         if(buf_size + 16 > (samples_end - samples)*3/8)

  549.             return -1;

  550. 

  551.         c->status[0].predictor  = (int16_t)AV_RL16(src + 10);

  552.         c->status[1].predictor  = (int16_t)AV_RL16(src + 12);

  553.         c->status[0].step_index = src[14];

  554.         c->status[1].step_index = src[15];

  555.         /* sign extend the predictors */

  556.         src += 16;

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

  558. 

  559.         /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when

  560.          * the buffer is consumed */

  561.         while (1) {

  562. 

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

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

  565. 

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

  567.             DK3_GET_NEXT_NIBBLE();

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

  569. 

  570.             /* process the diff channel predictor */

  571.             DK3_GET_NEXT_NIBBLE();

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

  573. 

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

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

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

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

  578. 

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

  580.             DK3_GET_NEXT_NIBBLE();

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

  582. 

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

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

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

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

  587.         }

  588.         break;

  589.     case CODEC_ID_ADPCM_IMA_ISS:

  590.         c->status[0].predictor  = (int16_t)AV_RL16(src + 0);

  591.         c->status[0].step_index = src[2];

  592.         src += 4;

  593.         if(st) {

  594.             c->status[1].predictor  = (int16_t)AV_RL16(src + 0);

  595.             c->status[1].step_index = src[2];

  596.             src += 4;

  597.         }

  598. 

  599.         while (src < buf + buf_size) {

  600. 

  601.             if (st) {

  602.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  603.                     src[0] >> 4  , 3);

  604.                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],

  605.                     src[0] & 0x0F, 3);

  606.             } else {

  607.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  608.                     src[0] & 0x0F, 3);

  609.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  610.                     src[0] >> 4  , 3);

  611.             }

  612. 

  613.             src++;

  614.         }

  615.         break;

  616.     case CODEC_ID_ADPCM_IMA_WS:

  617.         /* no per-block initialization; just start decoding the data */

  618.         while (src < buf + buf_size) {

  619. 

  620.             if (st) {

  621.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  622.                     src[0] >> 4  , 3);

  623.                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],

  624.                     src[0] & 0x0F, 3);

  625.             } else {

  626.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  627.                     src[0] >> 4  , 3);

  628.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  629.                     src[0] & 0x0F, 3);

  630.             }

  631. 

  632.             src++;

  633.         }

  634.         break;

  635.     case CODEC_ID_ADPCM_XA:

  636.         while (buf_size >= 128) {

  637.             xa_decode(samples, src, &c->status[0], &c->status[1],

  638.                 avctx->channels);

  639.             src += 128;

  640.             samples += 28 * 8;

  641.             buf_size -= 128;

  642.         }

  643.         break;

  644.     case CODEC_ID_ADPCM_IMA_EA_EACS: {

  645.         unsigned header_size = 4 + (8<<st);

  646.         samples_in_chunk = bytestream_get_le32(&src) >> (1-st);

  647. 

  648.         if (buf_size < header_size || samples_in_chunk > buf_size - header_size) {

  649.             src += buf_size - 4;

  650.             break;

  651.         }

  652. 

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

  654.             c->status[i].step_index = bytestream_get_le32(&src);

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

  656.             c->status[i].predictor  = bytestream_get_le32(&src);

  657. 

  658.         for (; samples_in_chunk; samples_in_chunk--, src++) {

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

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

  661.         }

  662.         break;

  663.     }

  664.     case CODEC_ID_ADPCM_IMA_EA_SEAD:

  665.         for (; src < buf+buf_size; src++) {

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

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

  668.         }

  669.         break;

  670.     case CODEC_ID_ADPCM_EA:

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

  672.            each coding 28 stereo samples. */

  673.         if (buf_size < 12) {

  674.             av_log(avctx, AV_LOG_ERROR, "frame too small\n");

  675.             return AVERROR(EINVAL);

  676.         }

  677.         samples_in_chunk = AV_RL32(src);

  678.         if (samples_in_chunk / 28 > (buf_size - 12) / 30) {

  679.             av_log(avctx, AV_LOG_ERROR, "invalid frame\n");

  680.             return AVERROR(EINVAL);

  681.         }

  682.         src += 4;

  683.         current_left_sample   = (int16_t)bytestream_get_le16(&src);

  684.         previous_left_sample  = (int16_t)bytestream_get_le16(&src);

  685.         current_right_sample  = (int16_t)bytestream_get_le16(&src);

  686.         previous_right_sample = (int16_t)bytestream_get_le16(&src);

  687. 

  688.         for (count1 = 0; count1 < samples_in_chunk/28;count1++) {

  689.             coeff1l = ea_adpcm_table[ *src >> 4       ];

  690.             coeff2l = ea_adpcm_table[(*src >> 4  ) + 4];

  691.             coeff1r = ea_adpcm_table[*src & 0x0F];

  692.             coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];

  693.             src++;

  694. 

  695.             shift_left  = (*src >> 4  ) + 8;

  696.             shift_right = (*src & 0x0F) + 8;

  697.             src++;

  698. 

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

  700.                 next_left_sample  = (int32_t)((*src & 0xF0) << 24) >> shift_left;

  701.                 next_right_sample = (int32_t)((*src & 0x0F) << 28) >> shift_right;

  702.                 src++;

  703. 

  704.                 next_left_sample = (next_left_sample +

  705.                     (current_left_sample * coeff1l) +

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

  707.                 next_right_sample = (next_right_sample +

  708.                     (current_right_sample * coeff1r) +

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

  710. 

  711.                 previous_left_sample = current_left_sample;

  712.                 current_left_sample = av_clip_int16(next_left_sample);

  713.                 previous_right_sample = current_right_sample;

  714.                 current_right_sample = av_clip_int16(next_right_sample);

  715.                 *samples++ = (unsigned short)current_left_sample;

  716.                 *samples++ = (unsigned short)current_right_sample;

  717.             }

  718.         }

  719. 

  720.         if (src - buf == buf_size - 2)

  721.             src += 2; // Skip terminating 0x0000

  722. 

  723.         break;

  724.     case CODEC_ID_ADPCM_EA_MAXIS_XA:

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

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

  727.                 coeff[channel][i] = ea_adpcm_table[(*src >> 4) + 4*i];

  728.             shift[channel] = (*src & 0x0F) + 8;

  729.             src++;

  730.         }

  731.         for (count1 = 0; count1 < (buf_size - avctx->channels) / avctx->channels; count1++) {

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

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

  734.                     int32_t sample = (int32_t)(((*(src+channel) >> i) & 0x0F) << 0x1C) >> shift[channel];

  735.                     sample = (sample +

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

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

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

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

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

  741.                 }

  742.             }

  743.             src+=avctx->channels;

  744.         }

  745.         break;

  746.     case CODEC_ID_ADPCM_EA_R1:

  747.     case CODEC_ID_ADPCM_EA_R2:

  748.     case CODEC_ID_ADPCM_EA_R3: {

  749.         /* channel numbering

  750.            2chan: 0=fl, 1=fr

  751.            4chan: 0=fl, 1=rl, 2=fr, 3=rr

  752.            6chan: 0=fl, 1=c,  2=fr, 3=rl,  4=rr, 5=sub */

  753.         const int big_endian = avctx->codec->id == CODEC_ID_ADPCM_EA_R3;

  754.         int32_t previous_sample, current_sample, next_sample;

  755.         int32_t coeff1, coeff2;

  756.         uint8_t shift;

  757.         unsigned int channel;

  758.         uint16_t *samplesC;

  759.         const uint8_t *srcC;

  760.         const uint8_t *src_end = buf + buf_size;

  761. 

  762.         samples_in_chunk = (big_endian ? bytestream_get_be32(&src)

  763.                                        : bytestream_get_le32(&src)) / 28;

  764.         if (samples_in_chunk > UINT32_MAX/(28*avctx->channels) ||

  765.             28*samples_in_chunk*avctx->channels > samples_end-samples) {

  766.             src += buf_size - 4;

  767.             break;

  768.         }

  769. 

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

  771.             int32_t offset = (big_endian ? bytestream_get_be32(&src)

  772.                                          : bytestream_get_le32(&src))

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

  774. 

  775.             if ((offset < 0) || (offset >= src_end - src - 4)) break;

  776.             srcC  = src + offset;

  777.             samplesC = samples + channel;

  778. 

  779.             if (avctx->codec->id == CODEC_ID_ADPCM_EA_R1) {

  780.                 current_sample  = (int16_t)bytestream_get_le16(&srcC);

  781.                 previous_sample = (int16_t)bytestream_get_le16(&srcC);

  782.             } else {

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

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

  785.             }

  786. 

  787.             for (count1=0; count1<samples_in_chunk; count1++) {

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

  789.                     srcC++;

  790.                     if (srcC > src_end - 30*2) break;

  791.                     current_sample  = (int16_t)bytestream_get_be16(&srcC);

  792.                     previous_sample = (int16_t)bytestream_get_be16(&srcC);

  793. 

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

  795.                         *samplesC = (int16_t)bytestream_get_be16(&srcC);

  796.                         samplesC += avctx->channels;

  797.                     }

  798.                 } else {

  799.                     coeff1 = ea_adpcm_table[ *srcC>>4     ];

  800.                     coeff2 = ea_adpcm_table[(*srcC>>4) + 4];

  801.                     shift = (*srcC++ & 0x0F) + 8;

  802. 

  803.                     if (srcC > src_end - 14) break;

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

  805.                         if (count2 & 1)

  806.                             next_sample = (int32_t)((*srcC++ & 0x0F) << 28) >> shift;

  807.                         else

  808.                             next_sample = (int32_t)((*srcC   & 0xF0) << 24) >> shift;

  809. 

  810.                         next_sample += (current_sample  * coeff1) +

  811.                                        (previous_sample * coeff2);

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

  813. 

  814.                         previous_sample = current_sample;

  815.                         current_sample  = next_sample;

  816.                         *samplesC = current_sample;

  817.                         samplesC += avctx->channels;

  818.                     }

  819.                 }

  820.             }

  821. 

  822.             if (avctx->codec->id != CODEC_ID_ADPCM_EA_R1) {

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

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

  825.             }

  826.         }

  827. 

  828.         src = src + buf_size - (4 + 4*avctx->channels);

  829.         samples += 28 * samples_in_chunk * avctx->channels;

  830.         break;

  831.     }

  832.     case CODEC_ID_ADPCM_EA_XAS:

  833.         if (samples_end-samples < 32*4*avctx->channels

  834.             || buf_size < (4+15)*4*avctx->channels) {

  835.             src += buf_size;

  836.             break;

  837.         }

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

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

  840.             short *s2, *s = &samples[channel];

  841.             for (n=0; n<4; n++, s+=32*avctx->channels) {

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

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

  844.                 shift[n] = (src[2]&0x0F) + 8;

  845.                 for (s2=s, i=0; i<2; i++, src+=2, s2+=avctx->channels)

  846.                     s2[0] = (src[0]&0xF0) + (src[1]<<8);

  847.             }

  848. 

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

  850.                 s = &samples[m*avctx->channels + channel];

  851.                 for (n=0; n<4; n++, src++, s+=32*avctx->channels) {

  852.                     for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) {

  853.                         int level = (int32_t)((*src & (0xF0>>i)) << (24+i)) >> shift[n];

  854.                         int pred  = s2[-1*avctx->channels] * coeff[0][n]

  855.                                   + s2[-2*avctx->channels] * coeff[1][n];

  856.                         s2[0] = av_clip_int16((level + pred + 0x80) >> 8);

  857.                     }

  858.                 }

  859.             }

  860.         }

  861.         samples += 32*4*avctx->channels;

  862.         break;

  863.     case CODEC_ID_ADPCM_IMA_AMV:

  864.     case CODEC_ID_ADPCM_IMA_SMJPEG:

  865.         c->status[0].predictor = (int16_t)bytestream_get_le16(&src);

  866.         c->status[0].step_index = bytestream_get_le16(&src);

  867. 

  868.         if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)

  869.             src+=4;

  870. 

  871.         while (src < buf + buf_size) {

  872.             char hi, lo;

  873.             lo = *src & 0x0F;

  874.             hi = *src >> 4;

  875. 

  876.             if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)

  877.                 FFSWAP(char, hi, lo);

  878. 

  879.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  880.                 lo, 3);

  881.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  882.                 hi, 3);

  883.             src++;

  884.         }

  885.         break;

  886.     case CODEC_ID_ADPCM_CT:

  887.         while (src < buf + buf_size) {

  888.             if (st) {

  889.                 *samples++ = adpcm_ct_expand_nibble(&c->status[0],

  890.                     src[0] >> 4);

  891.                 *samples++ = adpcm_ct_expand_nibble(&c->status[1],

  892.                     src[0] & 0x0F);

  893.             } else {

  894.                 *samples++ = adpcm_ct_expand_nibble(&c->status[0],

  895.                     src[0] >> 4);

  896.                 *samples++ = adpcm_ct_expand_nibble(&c->status[0],

  897.                     src[0] & 0x0F);

  898.             }

  899.             src++;

  900.         }

  901.         break;

  902.     case CODEC_ID_ADPCM_SBPRO_4:

  903.     case CODEC_ID_ADPCM_SBPRO_3:

  904.     case CODEC_ID_ADPCM_SBPRO_2:

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

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

  907.             *samples++ = 128 * (*src++ - 0x80);

  908.             if (st)

  909.               *samples++ = 128 * (*src++ - 0x80);

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

  911.         }

  912.         if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {

  913.             while (src < buf + buf_size) {

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

  915.                     src[0] >> 4, 4, 0);

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

  917.                     src[0] & 0x0F, 4, 0);

  918.                 src++;

  919.             }

  920.         } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {

  921.             while (src < buf + buf_size && samples + 2 < samples_end) {

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

  923.                      src[0] >> 5        , 3, 0);

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

  925.                     (src[0] >> 2) & 0x07, 3, 0);

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

  927.                     src[0] & 0x03, 2, 0);

  928.                 src++;

  929.             }

  930.         } else {

  931.             while (src < buf + buf_size && samples + 3 < samples_end) {

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

  933.                      src[0] >> 6        , 2, 2);

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

  935.                     (src[0] >> 4) & 0x03, 2, 2);

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

  937.                     (src[0] >> 2) & 0x03, 2, 2);

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

  939.                     src[0] & 0x03, 2, 2);

  940.                 src++;

  941.             }

  942.         }

  943.         break;

  944.     case CODEC_ID_ADPCM_SWF:

  945.     {

  946.         GetBitContext gb;

  947.         const int *table;

  948.         int k0, signmask, nb_bits, count;

  949.         int size = buf_size*8;

  950. 

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

  952. 

  953.         //read bits & initial values

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

  955.         //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);

  956.         table = swf_index_tables[nb_bits-2];

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

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

  959. 

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

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

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

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

  964.             }

  965. 

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

  967.                 int i;

  968. 

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

  970.                     // similar to IMA adpcm

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

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

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

  974.                     int k = k0;

  975. 

  976.                     do {

  977.                         if (delta & k)

  978.                             vpdiff += step;

  979.                         step >>= 1;

  980.                         k >>= 1;

  981.                     } while(k);

  982.                     vpdiff += step;

  983. 

  984.                     if (delta & signmask)

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

  986.                     else

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

  988. 

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

  990. 

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

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

  993. 

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

  995.                     if (samples >= samples_end) {

  996.                         av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");

  997.                         return -1;

  998.                     }

  999.                 }

  1000.             }

  1001.         }

  1002.         src += buf_size;

  1003.         break;

  1004.     }

  1005.     case CODEC_ID_ADPCM_YAMAHA:

  1006.         while (src < buf + buf_size) {

  1007.             if (st) {

  1008.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],

  1009.                         src[0] & 0x0F);

  1010.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[1],

  1011.                         src[0] >> 4  );

  1012.             } else {

  1013.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],

  1014.                         src[0] & 0x0F);

  1015.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],

  1016.                         src[0] >> 4  );

  1017.             }

  1018.             src++;

  1019.         }

  1020.         break;

  1021.     case CODEC_ID_ADPCM_THP:

  1022.     {

  1023.         int table[2][16];

  1024.         unsigned int samplecnt;

  1025.         int prev[2][2];

  1026.         int ch;

  1027. 

  1028.         if (buf_size < 80) {

  1029.             av_log(avctx, AV_LOG_ERROR, "frame too small\n");

  1030.             return -1;

  1031.         }

  1032. 

  1033.         src+=4;

  1034.         samplecnt = bytestream_get_be32(&src);

  1035. 

  1036.         for (i = 0; i < 32; i++)

  1037.             table[0][i] = (int16_t)bytestream_get_be16(&src);

  1038. 

  1039.         /* Initialize the previous sample.  */

  1040.         for (i = 0; i < 4; i++)

  1041.             prev[0][i] = (int16_t)bytestream_get_be16(&src);

  1042. 

  1043.         if (samplecnt >= (samples_end - samples) /  (st + 1)) {

  1044.             av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");

  1045.             return -1;

  1046.         }

  1047. 

  1048.         for (ch = 0; ch <= st; ch++) {

  1049.             samples = (unsigned short *) data + ch;

  1050. 

  1051.             /* Read in every sample for this channel.  */

  1052.             for (i = 0; i < samplecnt / 14; i++) {

  1053.                 int index = (*src >> 4) & 7;

  1054.                 unsigned int exp = 28 - (*src++ & 15);

  1055.                 int factor1 = table[ch][index * 2];

  1056.                 int factor2 = table[ch][index * 2 + 1];

  1057. 

  1058.                 /* Decode 14 samples.  */

  1059.                 for (n = 0; n < 14; n++) {

  1060.                     int32_t sampledat;

  1061.                     if(n&1) sampledat=  *src++    <<28;

  1062.                     else    sampledat= (*src&0xF0)<<24;

  1063. 

  1064.                     sampledat = ((prev[ch][0]*factor1

  1065.                                 + prev[ch][1]*factor2) >> 11) + (sampledat>>exp);

  1066.                     *samples = av_clip_int16(sampledat);

  1067.                     prev[ch][1] = prev[ch][0];

  1068.                     prev[ch][0] = *samples++;

  1069. 

  1070.                     /* In case of stereo, skip one sample, this sample

  1071.                        is for the other channel.  */

  1072.                     samples += st;

  1073.                 }

  1074.             }

  1075.         }

  1076. 

  1077.         /* In the previous loop, in case stereo is used, samples is

  1078.            increased exactly one time too often.  */

  1079.         samples -= st;

  1080.         break;

  1081.     }

  1082. 

  1083.     default:

  1084.         return -1;

  1085.     }

  1086.     *data_size = (uint8_t *)samples - (uint8_t *)data;

  1087.     return src - buf;

  1088. }

  1089. 

  1090. 

  1091. #define ADPCM_DECODER(id_, name_, long_name_)               \

  1092. AVCodec ff_ ## name_ ## _decoder = {                        \

  1093.     .name           = #name_,                               \

  1094.     .type           = AVMEDIA_TYPE_AUDIO,                   \

  1095.     .id             = id_,                                  \

  1096.     .priv_data_size = sizeof(ADPCMDecodeContext),           \

  1097.     .init           = adpcm_decode_init,                    \

  1098.     .decode         = adpcm_decode_frame,                   \

  1099.     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \

  1100. }

  1101. 

  1102. /* Note: Do not forget to add new entries to the Makefile as well. */

  1103. ADPCM_DECODER(CODEC_ID_ADPCM_4XM, adpcm_4xm, "ADPCM 4X Movie");

  1104. ADPCM_DECODER(CODEC_ID_ADPCM_CT, adpcm_ct, "ADPCM Creative Technology");

  1105. ADPCM_DECODER(CODEC_ID_ADPCM_EA, adpcm_ea, "ADPCM Electronic Arts");

  1106. ADPCM_DECODER(CODEC_ID_ADPCM_EA_MAXIS_XA, adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");

  1107. ADPCM_DECODER(CODEC_ID_ADPCM_EA_R1, adpcm_ea_r1, "ADPCM Electronic Arts R1");

  1108. ADPCM_DECODER(CODEC_ID_ADPCM_EA_R2, adpcm_ea_r2, "ADPCM Electronic Arts R2");

  1109. ADPCM_DECODER(CODEC_ID_ADPCM_EA_R3, adpcm_ea_r3, "ADPCM Electronic Arts R3");

  1110. ADPCM_DECODER(CODEC_ID_ADPCM_EA_XAS, adpcm_ea_xas, "ADPCM Electronic Arts XAS");

  1111. ADPCM_DECODER(CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv, "ADPCM IMA AMV");

  1112. ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3, "ADPCM IMA Duck DK3");

  1113. ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4, "ADPCM IMA Duck DK4");

  1114. ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");

  1115. ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");

  1116. ADPCM_DECODER(CODEC_ID_ADPCM_IMA_ISS, adpcm_ima_iss, "ADPCM IMA Funcom ISS");

  1117. ADPCM_DECODER(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, "ADPCM IMA QuickTime");

  1118. ADPCM_DECODER(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");

  1119. ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, "ADPCM IMA WAV");

  1120. ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws, "ADPCM IMA Westwood");

  1121. ADPCM_DECODER(CODEC_ID_ADPCM_MS, adpcm_ms, "ADPCM Microsoft");

  1122. ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");

  1123. ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");

  1124. ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");

  1125. ADPCM_DECODER(CODEC_ID_ADPCM_SWF, adpcm_swf, "ADPCM Shockwave Flash");

  1126. ADPCM_DECODER(CODEC_ID_ADPCM_THP, adpcm_thp, "ADPCM Nintendo Gamecube THP");

  1127. ADPCM_DECODER(CODEC_ID_ADPCM_XA, adpcm_xa, "ADPCM CDROM XA");

  1128. ADPCM_DECODER(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha, "ADPCM Yamaha");