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FFmpeg/libavcodec/adpcm.c

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  1. /*

  2.  * ADPCM codecs

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. #include "avcodec.h"

  22. #include "bitstream.h"

  23. #include "bytestream.h"

  24. 

  25. /**

  26.  * @file adpcm.c

  27.  * ADPCM codecs.

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

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

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

  31.  * CD-ROM XA ADPCM codec by BERO

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

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

  34.  *

  35.  * Features and limitations:

  36.  *

  37.  * Reference documents:

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

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

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

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

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

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

  44.  *

  45.  * CD-ROM XA:

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

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

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

  49.  */

  50. 

  51. #define BLKSIZE 1024

  52. 

  53. /* step_table[] and index_table[] are from the ADPCM reference source */

  54. /* This is the index table: */

  55. static const int index_table[16] = {

  56.     -1, -1, -1, -1, 2, 4, 6, 8,

  57.     -1, -1, -1, -1, 2, 4, 6, 8,

  58. };

  59. 

  60. /**

  61.  * This is the step table. Note that many programs use slight deviations from

  62.  * this table, but such deviations are negligible:

  63.  */

  64. static const int step_table[89] = {

  65.     7, 8, 9, 10, 11, 12, 13, 14, 16, 17,

  66.     19, 21, 23, 25, 28, 31, 34, 37, 41, 45,

  67.     50, 55, 60, 66, 73, 80, 88, 97, 107, 118,

  68.     130, 143, 157, 173, 190, 209, 230, 253, 279, 307,

  69.     337, 371, 408, 449, 494, 544, 598, 658, 724, 796,

  70.     876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,

  71.     2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,

  72.     5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,

  73.     15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767

  74. };

  75. 

  76. /* These are for MS-ADPCM */

  77. /* AdaptationTable[], AdaptCoeff1[], and AdaptCoeff2[] are from libsndfile */

  78. static const int AdaptationTable[] = {

  79.         230, 230, 230, 230, 307, 409, 512, 614,

  80.         768, 614, 512, 409, 307, 230, 230, 230

  81. };

  82. 

  83. static const int AdaptCoeff1[] = {

  84.         256, 512, 0, 192, 240, 460, 392

  85. };

  86. 

  87. static const int AdaptCoeff2[] = {

  88.         0, -256, 0, 64, 0, -208, -232

  89. };

  90. 

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

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

  93.    {   0,   0 },

  94.    {  60,   0 },

  95.    { 115, -52 },

  96.    {  98, -55 },

  97.    { 122, -60 }

  98. };

  99. 

  100. static const int ea_adpcm_table[] = {

  101.     0, 240, 460, 392, 0, 0, -208, -220, 0, 1,

  102.     3, 4, 7, 8, 10, 11, 0, -1, -3, -4

  103. };

  104. 

  105. static const int ct_adpcm_table[8] = {

  106.     0x00E6, 0x00E6, 0x00E6, 0x00E6,

  107.     0x0133, 0x0199, 0x0200, 0x0266

  108. };

  109. 

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

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

  112.     /*2*/ { -1, 2 },

  113.     /*3*/ { -1, -1, 2, 4 },

  114.     /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },

  115.     /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }

  116. };

  117. 

  118. static const int yamaha_indexscale[] = {

  119.     230, 230, 230, 230, 307, 409, 512, 614,

  120.     230, 230, 230, 230, 307, 409, 512, 614

  121. };

  122. 

  123. static const int yamaha_difflookup[] = {

  124.     1, 3, 5, 7, 9, 11, 13, 15,

  125.     -1, -3, -5, -7, -9, -11, -13, -15

  126. };

  127. 

  128. /* end of tables */

  129. 

  130. typedef struct ADPCMChannelStatus {

  131.     int predictor;

  132.     short int step_index;

  133.     int step;

  134.     /* for encoding */

  135.     int prev_sample;

  136. 

  137.     /* MS version */

  138.     short sample1;

  139.     short sample2;

  140.     int coeff1;

  141.     int coeff2;

  142.     int idelta;

  143. } ADPCMChannelStatus;

  144. 

  145. typedef struct ADPCMContext {

  146.     int channel; /* for stereo MOVs, decode left, then decode right, then tell it's decoded */

  147.     ADPCMChannelStatus status[2];

  148.     short sample_buffer[32]; /* hold left samples while waiting for right samples */

  149. } ADPCMContext;

  150. 

  151. /* XXX: implement encoding */

  152. 

  153. #ifdef CONFIG_ENCODERS

  154. static int adpcm_encode_init(AVCodecContext *avctx)

  155. {

  156.     if (avctx->channels > 2)

  157.         return -1; /* only stereo or mono =) */

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

  159.     case CODEC_ID_ADPCM_IMA_QT:

  160.         av_log(avctx, AV_LOG_ERROR, "ADPCM: codec adpcm_ima_qt unsupported for encoding !\n");

  161.         avctx->frame_size = 64; /* XXX: can multiple of avctx->channels * 64 (left and right blocks are interleaved) */

  162.         return -1;

  163.         break;

  164.     case CODEC_ID_ADPCM_IMA_WAV:

  165.         avctx->frame_size = (BLKSIZE - 4 * avctx->channels) * 8 / (4 * avctx->channels) + 1; /* each 16 bits sample gives one nibble */

  166.                                                              /* and we have 4 bytes per channel overhead */

  167.         avctx->block_align = BLKSIZE;

  168.         /* seems frame_size isn't taken into account... have to buffer the samples :-( */

  169.         break;

  170.     case CODEC_ID_ADPCM_MS:

  171.         avctx->frame_size = (BLKSIZE - 7 * avctx->channels) * 2 / avctx->channels + 2; /* each 16 bits sample gives one nibble */

  172.                                                              /* and we have 7 bytes per channel overhead */

  173.         avctx->block_align = BLKSIZE;

  174.         break;

  175.     case CODEC_ID_ADPCM_YAMAHA:

  176.         avctx->frame_size = BLKSIZE * avctx->channels;

  177.         avctx->block_align = BLKSIZE;

  178.         break;

  179.     case CODEC_ID_ADPCM_SWF:

  180.         if (avctx->sample_rate != 11025 &&

  181.             avctx->sample_rate != 22050 &&

  182.             avctx->sample_rate != 44100) {

  183.             av_log(avctx, AV_LOG_ERROR, "Sample rate must be 11025, 22050 or 44100\n");

  184.             return -1;

  185.         }

  186.         avctx->frame_size = 512 * (avctx->sample_rate / 11025);

  187.         break;

  188.     default:

  189.         return -1;

  190.         break;

  191.     }

  192. 

  193.     avctx->coded_frame= avcodec_alloc_frame();

  194.     avctx->coded_frame->key_frame= 1;

  195. 

  196.     return 0;

  197. }

  198. 

  199. static int adpcm_encode_close(AVCodecContext *avctx)

  200. {

  201.     av_freep(&avctx->coded_frame);

  202. 

  203.     return 0;

  204. }

  205. 

  206. 

  207. static inline unsigned char adpcm_ima_compress_sample(ADPCMChannelStatus *c, short sample)

  208. {

  209.     int delta = sample - c->prev_sample;

  210.     int nibble = FFMIN(7, abs(delta)*4/step_table[c->step_index]) + (delta<0)*8;

  211.     c->prev_sample = c->prev_sample + ((step_table[c->step_index] * yamaha_difflookup[nibble]) / 8);

  212.     c->prev_sample = av_clip_int16(c->prev_sample);

  213.     c->step_index = av_clip(c->step_index + index_table[nibble], 0, 88);

  214.     return nibble;

  215. }

  216. 

  217. static inline unsigned char adpcm_ms_compress_sample(ADPCMChannelStatus *c, short sample)

  218. {

  219.     int predictor, nibble, bias;

  220. 

  221.     predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;

  222. 

  223.     nibble= sample - predictor;

  224.     if(nibble>=0) bias= c->idelta/2;

  225.     else          bias=-c->idelta/2;

  226. 

  227.     nibble= (nibble + bias) / c->idelta;

  228.     nibble= av_clip(nibble, -8, 7)&0x0F;

  229. 

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

  231.     predictor = av_clip_int16(predictor);

  232. 

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

  234.     c->sample1 = predictor;

  235. 

  236.     c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;

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

  238. 

  239.     return nibble;

  240. }

  241. 

  242. static inline unsigned char adpcm_yamaha_compress_sample(ADPCMChannelStatus *c, short sample)

  243. {

  244.     int nibble, delta;

  245. 

  246.     if(!c->step) {

  247.         c->predictor = 0;

  248.         c->step = 127;

  249.     }

  250. 

  251.     delta = sample - c->predictor;

  252. 

  253.     nibble = FFMIN(7, abs(delta)*4/c->step) + (delta<0)*8;

  254. 

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

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

  257.     c->step = (c->step * yamaha_indexscale[nibble]) >> 8;

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

  259. 

  260.     return nibble;

  261. }

  262. 

  263. typedef struct TrellisPath {

  264.     int nibble;

  265.     int prev;

  266. } TrellisPath;

  267. 

  268. typedef struct TrellisNode {

  269.     uint32_t ssd;

  270.     int path;

  271.     int sample1;

  272.     int sample2;

  273.     int step;

  274. } TrellisNode;

  275. 

  276. static void adpcm_compress_trellis(AVCodecContext *avctx, const short *samples,

  277.                                    uint8_t *dst, ADPCMChannelStatus *c, int n)

  278. {

  279. #define FREEZE_INTERVAL 128

  280.     //FIXME 6% faster if frontier is a compile-time constant

  281.     const int frontier = 1 << avctx->trellis;

  282.     const int stride = avctx->channels;

  283.     const int version = avctx->codec->id;

  284.     const int max_paths = frontier*FREEZE_INTERVAL;

  285.     TrellisPath paths[max_paths], *p;

  286.     TrellisNode node_buf[2][frontier];

  287.     TrellisNode *nodep_buf[2][frontier];

  288.     TrellisNode **nodes = nodep_buf[0]; // nodes[] is always sorted by .ssd

  289.     TrellisNode **nodes_next = nodep_buf[1];

  290.     int pathn = 0, froze = -1, i, j, k;

  291. 

  292.     assert(!(max_paths&(max_paths-1)));

  293. 

  294.     memset(nodep_buf, 0, sizeof(nodep_buf));

  295.     nodes[0] = &node_buf[1][0];

  296.     nodes[0]->ssd = 0;

  297.     nodes[0]->path = 0;

  298.     nodes[0]->step = c->step_index;

  299.     nodes[0]->sample1 = c->sample1;

  300.     nodes[0]->sample2 = c->sample2;

  301.     if(version == CODEC_ID_ADPCM_IMA_WAV)

  302.         nodes[0]->sample1 = c->prev_sample;

  303.     if(version == CODEC_ID_ADPCM_MS)

  304.         nodes[0]->step = c->idelta;

  305.     if(version == CODEC_ID_ADPCM_YAMAHA) {

  306.         if(c->step == 0) {

  307.             nodes[0]->step = 127;

  308.             nodes[0]->sample1 = 0;

  309.         } else {

  310.             nodes[0]->step = c->step;

  311.             nodes[0]->sample1 = c->predictor;

  312.         }

  313.     }

  314. 

  315.     for(i=0; i<n; i++) {

  316.         TrellisNode *t = node_buf[i&1];

  317.         TrellisNode **u;

  318.         int sample = samples[i*stride];

  319.         memset(nodes_next, 0, frontier*sizeof(TrellisNode*));

  320.         for(j=0; j<frontier && nodes[j]; j++) {

  321.             // higher j have higher ssd already, so they're unlikely to use a suboptimal next sample too

  322.             const int range = (j < frontier/2) ? 1 : 0;

  323.             const int step = nodes[j]->step;

  324.             int nidx;

  325.             if(version == CODEC_ID_ADPCM_MS) {

  326.                 const int predictor = ((nodes[j]->sample1 * c->coeff1) + (nodes[j]->sample2 * c->coeff2)) / 256;

  327.                 const int div = (sample - predictor) / step;

  328.                 const int nmin = av_clip(div-range, -8, 6);

  329.                 const int nmax = av_clip(div+range, -7, 7);

  330.                 for(nidx=nmin; nidx<=nmax; nidx++) {

  331.                     const int nibble = nidx & 0xf;

  332.                     int dec_sample = predictor + nidx * step;

  333. #define STORE_NODE(NAME, STEP_INDEX)\

  334.                     int d;\

  335.                     uint32_t ssd;\

  336.                     dec_sample = av_clip_int16(dec_sample);\

  337.                     d = sample - dec_sample;\

  338.                     ssd = nodes[j]->ssd + d*d;\

  339.                     if(nodes_next[frontier-1] && ssd >= nodes_next[frontier-1]->ssd)\

  340.                         continue;\

  341.                     /* Collapse any two states with the same previous sample value. \

  342.                      * One could also distinguish states by step and by 2nd to last

  343.                      * sample, but the effects of that are negligible. */\

  344.                     for(k=0; k<frontier && nodes_next[k]; k++) {\

  345.                         if(dec_sample == nodes_next[k]->sample1) {\

  346.                             assert(ssd >= nodes_next[k]->ssd);\

  347.                             goto next_##NAME;\

  348.                         }\

  349.                     }\

  350.                     for(k=0; k<frontier; k++) {\

  351.                         if(!nodes_next[k] || ssd < nodes_next[k]->ssd) {\

  352.                             TrellisNode *u = nodes_next[frontier-1];\

  353.                             if(!u) {\

  354.                                 assert(pathn < max_paths);\

  355.                                 u = t++;\

  356.                                 u->path = pathn++;\

  357.                             }\

  358.                             u->ssd = ssd;\

  359.                             u->step = STEP_INDEX;\

  360.                             u->sample2 = nodes[j]->sample1;\

  361.                             u->sample1 = dec_sample;\

  362.                             paths[u->path].nibble = nibble;\

  363.                             paths[u->path].prev = nodes[j]->path;\

  364.                             memmove(&nodes_next[k+1], &nodes_next[k], (frontier-k-1)*sizeof(TrellisNode*));\

  365.                             nodes_next[k] = u;\

  366.                             break;\

  367.                         }\

  368.                     }\

  369.                     next_##NAME:;

  370.                     STORE_NODE(ms, FFMAX(16, (AdaptationTable[nibble] * step) >> 8));

  371.                 }

  372.             } else if(version == CODEC_ID_ADPCM_IMA_WAV) {

  373. #define LOOP_NODES(NAME, STEP_TABLE, STEP_INDEX)\

  374.                 const int predictor = nodes[j]->sample1;\

  375.                 const int div = (sample - predictor) * 4 / STEP_TABLE;\

  376.                 int nmin = av_clip(div-range, -7, 6);\

  377.                 int nmax = av_clip(div+range, -6, 7);\

  378.                 if(nmin<=0) nmin--; /* distinguish -0 from +0 */\

  379.                 if(nmax<0) nmax--;\

  380.                 for(nidx=nmin; nidx<=nmax; nidx++) {\

  381.                     const int nibble = nidx<0 ? 7-nidx : nidx;\

  382.                     int dec_sample = predictor + (STEP_TABLE * yamaha_difflookup[nibble]) / 8;\

  383.                     STORE_NODE(NAME, STEP_INDEX);\

  384.                 }

  385.                 LOOP_NODES(ima, step_table[step], av_clip(step + index_table[nibble], 0, 88));

  386.             } else { //CODEC_ID_ADPCM_YAMAHA

  387.                 LOOP_NODES(yamaha, step, av_clip((step * yamaha_indexscale[nibble]) >> 8, 127, 24567));

  388. #undef LOOP_NODES

  389. #undef STORE_NODE

  390.             }

  391.         }

  392. 

  393.         u = nodes;

  394.         nodes = nodes_next;

  395.         nodes_next = u;

  396. 

  397.         // prevent overflow

  398.         if(nodes[0]->ssd > (1<<28)) {

  399.             for(j=1; j<frontier && nodes[j]; j++)

  400.                 nodes[j]->ssd -= nodes[0]->ssd;

  401.             nodes[0]->ssd = 0;

  402.         }

  403. 

  404.         // merge old paths to save memory

  405.         if(i == froze + FREEZE_INTERVAL) {

  406.             p = &paths[nodes[0]->path];

  407.             for(k=i; k>froze; k--) {

  408.                 dst[k] = p->nibble;

  409.                 p = &paths[p->prev];

  410.             }

  411.             froze = i;

  412.             pathn = 0;

  413.             // other nodes might use paths that don't coincide with the frozen one.

  414.             // checking which nodes do so is too slow, so just kill them all.

  415.             // this also slightly improves quality, but I don't know why.

  416.             memset(nodes+1, 0, (frontier-1)*sizeof(TrellisNode*));

  417.         }

  418.     }

  419. 

  420.     p = &paths[nodes[0]->path];

  421.     for(i=n-1; i>froze; i--) {

  422.         dst[i] = p->nibble;

  423.         p = &paths[p->prev];

  424.     }

  425. 

  426.     c->predictor = nodes[0]->sample1;

  427.     c->sample1 = nodes[0]->sample1;

  428.     c->sample2 = nodes[0]->sample2;

  429.     c->step_index = nodes[0]->step;

  430.     c->step = nodes[0]->step;

  431.     c->idelta = nodes[0]->step;

  432. }

  433. 

  434. static int adpcm_encode_frame(AVCodecContext *avctx,

  435.                             unsigned char *frame, int buf_size, void *data)

  436. {

  437.     int n, i, st;

  438.     short *samples;

  439.     unsigned char *dst;

  440.     ADPCMContext *c = avctx->priv_data;

  441. 

  442.     dst = frame;

  443.     samples = (short *)data;

  444.     st= avctx->channels == 2;

  445. /*    n = (BLKSIZE - 4 * avctx->channels) / (2 * 8 * avctx->channels); */

  446. 

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

  448.     case CODEC_ID_ADPCM_IMA_QT: /* XXX: can't test until we get .mov writer */

  449.         break;

  450.     case CODEC_ID_ADPCM_IMA_WAV:

  451.         n = avctx->frame_size / 8;

  452.             c->status[0].prev_sample = (signed short)samples[0]; /* XXX */

  453. /*            c->status[0].step_index = 0; *//* XXX: not sure how to init the state machine */

  454.             bytestream_put_le16(&dst, c->status[0].prev_sample);

  455.             *dst++ = (unsigned char)c->status[0].step_index;

  456.             *dst++ = 0; /* unknown */

  457.             samples++;

  458.             if (avctx->channels == 2) {

  459.                 c->status[1].prev_sample = (signed short)samples[1];

  460. /*                c->status[1].step_index = 0; */

  461.                 bytestream_put_le16(&dst, c->status[1].prev_sample);

  462.                 *dst++ = (unsigned char)c->status[1].step_index;

  463.                 *dst++ = 0;

  464.                 samples++;

  465.             }

  466. 

  467.             /* stereo: 4 bytes (8 samples) for left, 4 bytes for right, 4 bytes left, ... */

  468.             if(avctx->trellis > 0) {

  469.                 uint8_t buf[2][n*8];

  470.                 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n*8);

  471.                 if(avctx->channels == 2)

  472.                     adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n*8);

  473.                 for(i=0; i<n; i++) {

  474.                     *dst++ = buf[0][8*i+0] | (buf[0][8*i+1] << 4);

  475.                     *dst++ = buf[0][8*i+2] | (buf[0][8*i+3] << 4);

  476.                     *dst++ = buf[0][8*i+4] | (buf[0][8*i+5] << 4);

  477.                     *dst++ = buf[0][8*i+6] | (buf[0][8*i+7] << 4);

  478.                     if (avctx->channels == 2) {

  479.                         *dst++ = buf[1][8*i+0] | (buf[1][8*i+1] << 4);

  480.                         *dst++ = buf[1][8*i+2] | (buf[1][8*i+3] << 4);

  481.                         *dst++ = buf[1][8*i+4] | (buf[1][8*i+5] << 4);

  482.                         *dst++ = buf[1][8*i+6] | (buf[1][8*i+7] << 4);

  483.                     }

  484.                 }

  485.             } else

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

  487.                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[0]) & 0x0F;

  488.                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels]) << 4) & 0xF0;

  489.                 dst++;

  490.                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 2]) & 0x0F;

  491.                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 3]) << 4) & 0xF0;

  492.                 dst++;

  493.                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 4]) & 0x0F;

  494.                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 5]) << 4) & 0xF0;

  495.                 dst++;

  496.                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 6]) & 0x0F;

  497.                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 7]) << 4) & 0xF0;

  498.                 dst++;

  499.                 /* right channel */

  500.                 if (avctx->channels == 2) {

  501.                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[1]);

  502.                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[3]) << 4;

  503.                     dst++;

  504.                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[5]);

  505.                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[7]) << 4;

  506.                     dst++;

  507.                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[9]);

  508.                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[11]) << 4;

  509.                     dst++;

  510.                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[13]);

  511.                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[15]) << 4;

  512.                     dst++;

  513.                 }

  514.                 samples += 8 * avctx->channels;

  515.             }

  516.         break;

  517.     case CODEC_ID_ADPCM_SWF:

  518.     {

  519.         int i;

  520.         PutBitContext pb;

  521.         init_put_bits(&pb, dst, buf_size*8);

  522. 

  523.         //Store AdpcmCodeSize

  524.         put_bits(&pb, 2, 2);                //Set 4bits flash adpcm format

  525. 

  526.         //Init the encoder state

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

  528.             c->status[i].step_index = av_clip(c->status[i].step_index, 0, 63); // clip step so it fits 6 bits

  529.             put_bits(&pb, 16, samples[i] & 0xFFFF);

  530.             put_bits(&pb, 6, c->status[i].step_index);

  531.             c->status[i].prev_sample = (signed short)samples[i];

  532.         }

  533. 

  534.         for (i=1; i<avctx->frame_size; i++) {

  535.             put_bits(&pb, 4, adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels*i]) & 0xF);

  536.             if (avctx->channels == 2)

  537.                 put_bits(&pb, 4, adpcm_ima_compress_sample(&c->status[1], samples[2*i+1]) & 0xF);

  538.         }

  539.         flush_put_bits(&pb);

  540.         dst += put_bits_count(&pb)>>3;

  541.         break;

  542.     }

  543.     case CODEC_ID_ADPCM_MS:

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

  545.             int predictor=0;

  546. 

  547.             *dst++ = predictor;

  548.             c->status[i].coeff1 = AdaptCoeff1[predictor];

  549.             c->status[i].coeff2 = AdaptCoeff2[predictor];

  550.         }

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

  552.             if (c->status[i].idelta < 16)

  553.                 c->status[i].idelta = 16;

  554. 

  555.             bytestream_put_le16(&dst, c->status[i].idelta);

  556.         }

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

  558.             c->status[i].sample1= *samples++;

  559. 

  560.             bytestream_put_le16(&dst, c->status[i].sample1);

  561.         }

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

  563.             c->status[i].sample2= *samples++;

  564. 

  565.             bytestream_put_le16(&dst, c->status[i].sample2);

  566.         }

  567. 

  568.         if(avctx->trellis > 0) {

  569.             int n = avctx->block_align - 7*avctx->channels;

  570.             uint8_t buf[2][n];

  571.             if(avctx->channels == 1) {

  572.                 n *= 2;

  573.                 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);

  574.                 for(i=0; i<n; i+=2)

  575.                     *dst++ = (buf[0][i] << 4) | buf[0][i+1];

  576.             } else {

  577.                 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);

  578.                 adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n);

  579.                 for(i=0; i<n; i++)

  580.                     *dst++ = (buf[0][i] << 4) | buf[1][i];

  581.             }

  582.         } else

  583.         for(i=7*avctx->channels; i<avctx->block_align; i++) {

  584.             int nibble;

  585.             nibble = adpcm_ms_compress_sample(&c->status[ 0], *samples++)<<4;

  586.             nibble|= adpcm_ms_compress_sample(&c->status[st], *samples++);

  587.             *dst++ = nibble;

  588.         }

  589.         break;

  590.     case CODEC_ID_ADPCM_YAMAHA:

  591.         n = avctx->frame_size / 2;

  592.         if(avctx->trellis > 0) {

  593.             uint8_t buf[2][n*2];

  594.             n *= 2;

  595.             if(avctx->channels == 1) {

  596.                 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);

  597.                 for(i=0; i<n; i+=2)

  598.                     *dst++ = buf[0][i] | (buf[0][i+1] << 4);

  599.             } else {

  600.                 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);

  601.                 adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n);

  602.                 for(i=0; i<n; i++)

  603.                     *dst++ = buf[0][i] | (buf[1][i] << 4);

  604.             }

  605.         } else

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

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

  608.                 int nibble;

  609.                 nibble  = adpcm_yamaha_compress_sample(&c->status[i], samples[i]);

  610.                 nibble |= adpcm_yamaha_compress_sample(&c->status[i], samples[i+avctx->channels]) << 4;

  611.                 *dst++ = nibble;

  612.             }

  613.             samples += 2 * avctx->channels;

  614.         }

  615.         break;

  616.     default:

  617.         return -1;

  618.     }

  619.     return dst - frame;

  620. }

  621. #endif //CONFIG_ENCODERS

  622. 

  623. static int adpcm_decode_init(AVCodecContext * avctx)

  624. {

  625.     ADPCMContext *c = avctx->priv_data;

  626. 

  627.     if(avctx->channels > 2U){

  628.         return -1;

  629.     }

  630. 

  631.     c->channel = 0;

  632.     c->status[0].predictor = c->status[1].predictor = 0;

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

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

  635. 

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

  637.     case CODEC_ID_ADPCM_CT:

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

  639.         break;

  640.     case CODEC_ID_ADPCM_IMA_WS:

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

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

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

  644.         }

  645.         break;

  646.     default:

  647.         break;

  648.     }

  649.     return 0;

  650. }

  651. 

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

  653. {

  654.     int step_index;

  655.     int predictor;

  656.     int sign, delta, diff, step;

  657. 

  658.     step = step_table[c->step_index];

  659.     step_index = c->step_index + index_table[(unsigned)nibble];

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

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

  662. 

  663.     sign = nibble & 8;

  664.     delta = nibble & 7;

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

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

  667.      * quickly enough */

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

  669.     predictor = c->predictor;

  670.     if (sign) predictor -= diff;

  671.     else predictor += diff;

  672. 

  673.     predictor = av_clip_int16(predictor);

  674.     c->predictor = predictor;

  675.     c->step_index = step_index;

  676. 

  677.     return (short)predictor;

  678. }

  679. 

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

  681. {

  682.     int predictor;

  683. 

  684.     predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;

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

  686.     predictor = av_clip_int16(predictor);

  687. 

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

  689.     c->sample1 = predictor;

  690.     c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;

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

  692. 

  693.     return (short)predictor;

  694. }

  695. 

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

  697. {

  698.     int predictor;

  699.     int sign, delta, diff;

  700.     int new_step;

  701. 

  702.     sign = nibble & 8;

  703.     delta = nibble & 7;

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

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

  706.      * quickly enough */

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

  708.     predictor = c->predictor;

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

  710.     if(sign)

  711.         predictor = ((predictor * 254) >> 8) - diff;

  712.     else

  713.             predictor = ((predictor * 254) >> 8) + diff;

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

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

  716.     c->step = new_step;

  717.     if(c->step < 511)

  718.         c->step = 511;

  719.     if(c->step > 32767)

  720.         c->step = 32767;

  721. 

  722.     predictor = av_clip_int16(predictor);

  723.     c->predictor = predictor;

  724.     return (short)predictor;

  725. }

  726. 

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

  728. {

  729.     int sign, delta, diff;

  730. 

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

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

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

  734. 

  735.     if (sign)

  736.         c->predictor -= diff;

  737.     else

  738.         c->predictor += diff;

  739. 

  740.     /* clamp result */

  741.     if (c->predictor > 16256)

  742.         c->predictor = 16256;

  743.     else if (c->predictor < -16384)

  744.         c->predictor = -16384;

  745. 

  746.     /* calculate new step */

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

  748.         c->step++;

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

  750.         c->step--;

  751. 

  752.     return (short) c->predictor;

  753. }

  754. 

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

  756. {

  757.     if(!c->step) {

  758.         c->predictor = 0;

  759.         c->step = 127;

  760.     }

  761. 

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

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

  764.     c->step = (c->step * yamaha_indexscale[nibble]) >> 8;

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

  766.     return c->predictor;

  767. }

  768. 

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

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

  771. {

  772.     int i, j;

  773.     int shift,filter,f0,f1;

  774.     int s_1,s_2;

  775.     int d,s,t;

  776. 

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

  778. 

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

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

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

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

  783. 

  784.         s_1 = left->sample1;

  785.         s_2 = left->sample2;

  786. 

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

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

  789. 

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

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

  792.             s = av_clip_int16(s);

  793.             *out = s;

  794.             out += inc;

  795.             s_2 = s_1;

  796.             s_1 = s;

  797.         }

  798. 

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

  800.             left->sample1 = s_1;

  801.             left->sample2 = s_2;

  802.             s_1 = right->sample1;

  803.             s_2 = right->sample2;

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

  805.         }

  806. 

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

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

  809. 

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

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

  812. 

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

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

  815. 

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

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

  818.             s = av_clip_int16(s);

  819.             *out = s;

  820.             out += inc;

  821.             s_2 = s_1;

  822.             s_1 = s;

  823.         }

  824. 

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

  826.             right->sample1 = s_1;

  827.             right->sample2 = s_2;

  828.             out -= 1;

  829.         } else {

  830.             left->sample1 = s_1;

  831.             left->sample2 = s_2;

  832.         }

  833.     }

  834. }

  835. 

  836. 

  837. /* DK3 ADPCM support macro */

  838. #define DK3_GET_NEXT_NIBBLE() \

  839.     if (decode_top_nibble_next) \

  840.     { \

  841.         nibble = (last_byte >> 4) & 0x0F; \

  842.         decode_top_nibble_next = 0; \

  843.     } \

  844.     else \

  845.     { \

  846.         last_byte = *src++; \

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

  848.         nibble = last_byte & 0x0F; \

  849.         decode_top_nibble_next = 1; \

  850.     }

  851. 

  852. static int adpcm_decode_frame(AVCodecContext *avctx,

  853.                             void *data, int *data_size,

  854.                             uint8_t *buf, int buf_size)

  855. {

  856.     ADPCMContext *c = avctx->priv_data;

  857.     ADPCMChannelStatus *cs;

  858.     int n, m, channel, i;

  859.     int block_predictor[2];

  860.     short *samples;

  861.     short *samples_end;

  862.     uint8_t *src;

  863.     int st; /* stereo */

  864. 

  865.     /* DK3 ADPCM accounting variables */

  866.     unsigned char last_byte = 0;

  867.     unsigned char nibble;

  868.     int decode_top_nibble_next = 0;

  869.     int diff_channel;

  870. 

  871.     /* EA ADPCM state variables */

  872.     uint32_t samples_in_chunk;

  873.     int32_t previous_left_sample, previous_right_sample;

  874.     int32_t current_left_sample, current_right_sample;

  875.     int32_t next_left_sample, next_right_sample;

  876.     int32_t coeff1l, coeff2l, coeff1r, coeff2r;

  877.     uint8_t shift_left, shift_right;

  878.     int count1, count2;

  879. 

  880.     if (!buf_size)

  881.         return 0;

  882. 

  883.     //should protect all 4bit ADPCM variants

  884.     //8 is needed for CODEC_ID_ADPCM_IMA_WAV with 2 channels

  885.     //

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

  887.         return -1;

  888. 

  889.     samples = data;

  890.     samples_end= samples + *data_size/2;

  891.     *data_size= 0;

  892.     src = buf;

  893. 

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

  895. 

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

  897.     case CODEC_ID_ADPCM_IMA_QT:

  898.         n = (buf_size - 2);/* >> 2*avctx->channels;*/

  899.         channel = c->channel;

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

  901.         /* (pppppp) (piiiiiii) */

  902. 

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

  904.         cs->predictor = (*src++) << 8;

  905.         cs->predictor |= (*src & 0x80);

  906.         cs->predictor &= 0xFF80;

  907. 

  908.         /* sign extension */

  909.         if(cs->predictor & 0x8000)

  910.             cs->predictor -= 0x10000;

  911. 

  912.         cs->predictor = av_clip_int16(cs->predictor);

  913. 

  914.         cs->step_index = (*src++) & 0x7F;

  915. 

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

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

  918.             cs->step_index = 88;

  919.         }

  920. 

  921.         cs->step = step_table[cs->step_index];

  922. 

  923.         if (st && channel)

  924.             samples++;

  925. 

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

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

  928.             samples += avctx->channels;

  929.             *samples = adpcm_ima_expand_nibble(cs, (src[0] >> 4) & 0x0F, 3);

  930.             samples += avctx->channels;

  931.             src ++;

  932.         }

  933. 

  934.         if(st) { /* handle stereo interlacing */

  935.             c->channel = (channel + 1) % 2; /* we get one packet for left, then one for right data */

  936.             if(channel == 1) { /* wait for the other packet before outputing anything */

  937.                 return src - buf;

  938.             }

  939.         }

  940.         break;

  941.     case CODEC_ID_ADPCM_IMA_WAV:

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

  943.             buf_size = avctx->block_align;

  944. 

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

  946. 

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

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

  949.             cs->predictor = (int16_t)(src[0] + (src[1]<<8));

  950.             src+=2;

  951. 

  952.         // XXX: is this correct ??: *samples++ = cs->predictor;

  953. 

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

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

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

  957.                 cs->step_index = 88;

  958.             }

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

  960.         }

  961. 

  962.         while(src < buf + buf_size){

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

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

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

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

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

  968.                 src++;

  969.             }

  970.             src += 4*st;

  971.         }

  972.         break;

  973.     case CODEC_ID_ADPCM_4XM:

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

  975.         c->status[0].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;

  976.         if(st){

  977.             c->status[1].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;

  978.         }

  979.         c->status[0].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;

  980.         if(st){

  981.             c->status[1].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;

  982.         }

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

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

  985. 

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

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

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

  989.             if (st)

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

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

  992.             if (st)

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

  994.         }

  995. 

  996.         src += m<<st;

  997. 

  998.         break;

  999.     case CODEC_ID_ADPCM_MS:

  1000.         if (avctx->block_align != 0 && buf_size > avctx->block_align)

  1001.             buf_size = avctx->block_align;

  1002.         n = buf_size - 7 * avctx->channels;

  1003.         if (n < 0)

  1004.             return -1;

  1005.         block_predictor[0] = av_clip(*src++, 0, 7);

  1006.         block_predictor[1] = 0;

  1007.         if (st)

  1008.             block_predictor[1] = av_clip(*src++, 0, 7);

  1009.         c->status[0].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1010.         src+=2;

  1011.         if (st){

  1012.             c->status[1].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1013.             src+=2;

  1014.         }

  1015.         c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];

  1016.         c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];

  1017.         c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];

  1018.         c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];

  1019. 

  1020.         c->status[0].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1021.         src+=2;

  1022.         if (st) c->status[1].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1023.         if (st) src+=2;

  1024.         c->status[0].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1025.         src+=2;

  1026.         if (st) c->status[1].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1027.         if (st) src+=2;

  1028. 

  1029.         *samples++ = c->status[0].sample1;

  1030.         if (st) *samples++ = c->status[1].sample1;

  1031.         *samples++ = c->status[0].sample2;

  1032.         if (st) *samples++ = c->status[1].sample2;

  1033.         for(;n>0;n--) {

  1034.             *samples++ = adpcm_ms_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);

  1035.             *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);

  1036.             src ++;

  1037.         }

  1038.         break;

  1039.     case CODEC_ID_ADPCM_IMA_DK4:

  1040.         if (avctx->block_align != 0 && buf_size > avctx->block_align)

  1041.             buf_size = avctx->block_align;

  1042. 

  1043.         c->status[0].predictor = (int16_t)(src[0] | (src[1] << 8));

  1044.         c->status[0].step_index = src[2];

  1045.         src += 4;

  1046.         *samples++ = c->status[0].predictor;

  1047.         if (st) {

  1048.             c->status[1].predictor = (int16_t)(src[0] | (src[1] << 8));

  1049.             c->status[1].step_index = src[2];

  1050.             src += 4;

  1051.             *samples++ = c->status[1].predictor;

  1052.         }

  1053.         while (src < buf + buf_size) {

  1054. 

  1055.             /* take care of the top nibble (always left or mono channel) */

  1056.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1057.                 (src[0] >> 4) & 0x0F, 3);

  1058. 

  1059.             /* take care of the bottom nibble, which is right sample for

  1060.              * stereo, or another mono sample */

  1061.             if (st)

  1062.                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],

  1063.                     src[0] & 0x0F, 3);

  1064.             else

  1065.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1066.                     src[0] & 0x0F, 3);

  1067. 

  1068.             src++;

  1069.         }

  1070.         break;

  1071.     case CODEC_ID_ADPCM_IMA_DK3:

  1072.         if (avctx->block_align != 0 && buf_size > avctx->block_align)

  1073.             buf_size = avctx->block_align;

  1074. 

  1075.         if(buf_size + 16 > (samples_end - samples)*3/8)

  1076.             return -1;

  1077. 

  1078.         c->status[0].predictor = (int16_t)(src[10] | (src[11] << 8));

  1079.         c->status[1].predictor = (int16_t)(src[12] | (src[13] << 8));

  1080.         c->status[0].step_index = src[14];

  1081.         c->status[1].step_index = src[15];

  1082.         /* sign extend the predictors */

  1083.         src += 16;

  1084.         diff_channel = c->status[1].predictor;

  1085. 

  1086.         /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when

  1087.          * the buffer is consumed */

  1088.         while (1) {

  1089. 

  1090.             /* for this algorithm, c->status[0] is the sum channel and

  1091.              * c->status[1] is the diff channel */

  1092. 

  1093.             /* process the first predictor of the sum channel */

  1094.             DK3_GET_NEXT_NIBBLE();

  1095.             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

  1096. 

  1097.             /* process the diff channel predictor */

  1098.             DK3_GET_NEXT_NIBBLE();

  1099.             adpcm_ima_expand_nibble(&c->status[1], nibble, 3);

  1100. 

  1101.             /* process the first pair of stereo PCM samples */

  1102.             diff_channel = (diff_channel + c->status[1].predictor) / 2;

  1103.             *samples++ = c->status[0].predictor + c->status[1].predictor;

  1104.             *samples++ = c->status[0].predictor - c->status[1].predictor;

  1105. 

  1106.             /* process the second predictor of the sum channel */

  1107.             DK3_GET_NEXT_NIBBLE();

  1108.             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

  1109. 

  1110.             /* process the second pair of stereo PCM samples */

  1111.             diff_channel = (diff_channel + c->status[1].predictor) / 2;

  1112.             *samples++ = c->status[0].predictor + c->status[1].predictor;

  1113.             *samples++ = c->status[0].predictor - c->status[1].predictor;

  1114.         }

  1115.         break;

  1116.     case CODEC_ID_ADPCM_IMA_WS:

  1117.         /* no per-block initialization; just start decoding the data */

  1118.         while (src < buf + buf_size) {

  1119. 

  1120.             if (st) {

  1121.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1122.                     (src[0] >> 4) & 0x0F, 3);

  1123.                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],

  1124.                     src[0] & 0x0F, 3);

  1125.             } else {

  1126.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1127.                     (src[0] >> 4) & 0x0F, 3);

  1128.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1129.                     src[0] & 0x0F, 3);

  1130.             }

  1131. 

  1132.             src++;

  1133.         }

  1134.         break;

  1135.     case CODEC_ID_ADPCM_XA:

  1136.         c->status[0].sample1 = c->status[0].sample2 =

  1137.         c->status[1].sample1 = c->status[1].sample2 = 0;

  1138.         while (buf_size >= 128) {

  1139.             xa_decode(samples, src, &c->status[0], &c->status[1],

  1140.                 avctx->channels);

  1141.             src += 128;

  1142.             samples += 28 * 8;

  1143.             buf_size -= 128;

  1144.         }

  1145.         break;

  1146.     case CODEC_ID_ADPCM_EA:

  1147.         samples_in_chunk = AV_RL32(src);

  1148.         if (samples_in_chunk >= ((buf_size - 12) * 2)) {

  1149.             src += buf_size;

  1150.             break;

  1151.         }

  1152.         src += 4;

  1153.         current_left_sample = (int16_t)AV_RL16(src);

  1154.         src += 2;

  1155.         previous_left_sample = (int16_t)AV_RL16(src);

  1156.         src += 2;

  1157.         current_right_sample = (int16_t)AV_RL16(src);

  1158.         src += 2;

  1159.         previous_right_sample = (int16_t)AV_RL16(src);

  1160.         src += 2;

  1161. 

  1162.         for (count1 = 0; count1 < samples_in_chunk/28;count1++) {

  1163.             coeff1l = ea_adpcm_table[(*src >> 4) & 0x0F];

  1164.             coeff2l = ea_adpcm_table[((*src >> 4) & 0x0F) + 4];

  1165.             coeff1r = ea_adpcm_table[*src & 0x0F];

  1166.             coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];

  1167.             src++;

  1168. 

  1169.             shift_left = ((*src >> 4) & 0x0F) + 8;

  1170.             shift_right = (*src & 0x0F) + 8;

  1171.             src++;

  1172. 

  1173.             for (count2 = 0; count2 < 28; count2++) {

  1174.                 next_left_sample = (((*src & 0xF0) << 24) >> shift_left);

  1175.                 next_right_sample = (((*src & 0x0F) << 28) >> shift_right);

  1176.                 src++;

  1177. 

  1178.                 next_left_sample = (next_left_sample +

  1179.                     (current_left_sample * coeff1l) +

  1180.                     (previous_left_sample * coeff2l) + 0x80) >> 8;

  1181.                 next_right_sample = (next_right_sample +

  1182.                     (current_right_sample * coeff1r) +

  1183.                     (previous_right_sample * coeff2r) + 0x80) >> 8;

  1184.                 next_left_sample = av_clip_int16(next_left_sample);

  1185.                 next_right_sample = av_clip_int16(next_right_sample);

  1186. 

  1187.                 previous_left_sample = current_left_sample;

  1188.                 current_left_sample = next_left_sample;

  1189.                 previous_right_sample = current_right_sample;

  1190.                 current_right_sample = next_right_sample;

  1191.                 *samples++ = (unsigned short)current_left_sample;

  1192.                 *samples++ = (unsigned short)current_right_sample;

  1193.             }

  1194.         }

  1195.         break;

  1196.     case CODEC_ID_ADPCM_IMA_SMJPEG:

  1197.         c->status[0].predictor = *src;

  1198.         src += 2;

  1199.         c->status[0].step_index = *src++;

  1200.         src++;  /* skip another byte before getting to the meat */

  1201.         while (src < buf + buf_size) {

  1202.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1203.                 *src & 0x0F, 3);

  1204.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1205.                 (*src >> 4) & 0x0F, 3);

  1206.             src++;

  1207.         }

  1208.         break;

  1209.     case CODEC_ID_ADPCM_CT:

  1210.         while (src < buf + buf_size) {

  1211.             if (st) {

  1212.                 *samples++ = adpcm_ct_expand_nibble(&c->status[0],

  1213.                     (src[0] >> 4) & 0x0F);

  1214.                 *samples++ = adpcm_ct_expand_nibble(&c->status[1],

  1215.                     src[0] & 0x0F);

  1216.             } else {

  1217.                 *samples++ = adpcm_ct_expand_nibble(&c->status[0],

  1218.                     (src[0] >> 4) & 0x0F);

  1219.                 *samples++ = adpcm_ct_expand_nibble(&c->status[0],

  1220.                     src[0] & 0x0F);

  1221.             }

  1222.             src++;

  1223.         }

  1224.         break;

  1225.     case CODEC_ID_ADPCM_SBPRO_4:

  1226.     case CODEC_ID_ADPCM_SBPRO_3:

  1227.     case CODEC_ID_ADPCM_SBPRO_2:

  1228.         if (!c->status[0].step_index) {

  1229.             /* the first byte is a raw sample */

  1230.             *samples++ = 128 * (*src++ - 0x80);

  1231.             if (st)

  1232.               *samples++ = 128 * (*src++ - 0x80);

  1233.             c->status[0].step_index = 1;

  1234.         }

  1235.         if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {

  1236.             while (src < buf + buf_size) {

  1237.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1238.                     (src[0] >> 4) & 0x0F, 4, 0);

  1239.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1240.                     src[0] & 0x0F, 4, 0);

  1241.                 src++;

  1242.             }

  1243.         } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {

  1244.             while (src < buf + buf_size && samples + 2 < samples_end) {

  1245.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1246.                     (src[0] >> 5) & 0x07, 3, 0);

  1247.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1248.                     (src[0] >> 2) & 0x07, 3, 0);

  1249.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1250.                     src[0] & 0x03, 2, 0);

  1251.                 src++;

  1252.             }

  1253.         } else {

  1254.             while (src < buf + buf_size && samples + 3 < samples_end) {

  1255.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1256.                     (src[0] >> 6) & 0x03, 2, 2);

  1257.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1258.                     (src[0] >> 4) & 0x03, 2, 2);

  1259.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1260.                     (src[0] >> 2) & 0x03, 2, 2);

  1261.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1262.                     src[0] & 0x03, 2, 2);

  1263.                 src++;

  1264.             }

  1265.         }

  1266.         break;

  1267.     case CODEC_ID_ADPCM_SWF:

  1268.     {

  1269.         GetBitContext gb;

  1270.         const int *table;

  1271.         int k0, signmask, nb_bits, count;

  1272.         int size = buf_size*8;

  1273. 

  1274.         init_get_bits(&gb, buf, size);

  1275. 

  1276.         //read bits & initial values

  1277.         nb_bits = get_bits(&gb, 2)+2;

  1278.         //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);

  1279.         table = swf_index_tables[nb_bits-2];

  1280.         k0 = 1 << (nb_bits-2);

  1281.         signmask = 1 << (nb_bits-1);

  1282. 

  1283.         while (get_bits_count(&gb) <= size - 22*avctx->channels) {

  1284.             for (i = 0; i < avctx->channels; i++) {

  1285.                 *samples++ = c->status[i].predictor = get_sbits(&gb, 16);

  1286.                 c->status[i].step_index = get_bits(&gb, 6);

  1287.             }

  1288. 

  1289.             for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {

  1290.                 int i;

  1291. 

  1292.                 for (i = 0; i < avctx->channels; i++) {

  1293.                     // similar to IMA adpcm

  1294.                     int delta = get_bits(&gb, nb_bits);

  1295.                     int step = step_table[c->status[i].step_index];

  1296.                     long vpdiff = 0; // vpdiff = (delta+0.5)*step/4

  1297.                     int k = k0;

  1298. 

  1299.                     do {

  1300.                         if (delta & k)

  1301.                             vpdiff += step;

  1302.                         step >>= 1;

  1303.                         k >>= 1;

  1304.                     } while(k);

  1305.                     vpdiff += step;

  1306. 

  1307.                     if (delta & signmask)

  1308.                         c->status[i].predictor -= vpdiff;

  1309.                     else

  1310.                         c->status[i].predictor += vpdiff;

  1311. 

  1312.                     c->status[i].step_index += table[delta & (~signmask)];

  1313. 

  1314.                     c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);

  1315.                     c->status[i].predictor = av_clip_int16(c->status[i].predictor);

  1316. 

  1317.                     *samples++ = c->status[i].predictor;

  1318.                     if (samples >= samples_end) {

  1319.                         av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");

  1320.                         return -1;

  1321.                     }

  1322.                 }

  1323.             }

  1324.         }

  1325.         src += buf_size;

  1326.         break;

  1327.     }

  1328.     case CODEC_ID_ADPCM_YAMAHA:

  1329.         while (src < buf + buf_size) {

  1330.             if (st) {

  1331.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],

  1332.                         src[0] & 0x0F);

  1333.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[1],

  1334.                         (src[0] >> 4) & 0x0F);

  1335.             } else {

  1336.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],

  1337.                         src[0] & 0x0F);

  1338.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],

  1339.                         (src[0] >> 4) & 0x0F);

  1340.             }

  1341.             src++;

  1342.         }

  1343.         break;

  1344.     case CODEC_ID_ADPCM_THP:

  1345.     {

  1346.         int table[2][16];

  1347.         unsigned int samplecnt;

  1348.         int prev[2][2];

  1349.         int ch;

  1350. 

  1351.         if (buf_size < 80) {

  1352.             av_log(avctx, AV_LOG_ERROR, "frame too small\n");

  1353.             return -1;

  1354.         }

  1355. 

  1356.         src+=4;

  1357.         samplecnt = bytestream_get_be32(&src);

  1358. 

  1359.         for (i = 0; i < 32; i++)

  1360.             table[0][i] = (int16_t)bytestream_get_be16(&src);

  1361. 

  1362.         /* Initialize the previous sample.  */

  1363.         for (i = 0; i < 4; i++)

  1364.             prev[0][i] = (int16_t)bytestream_get_be16(&src);

  1365. 

  1366.         if (samplecnt >= (samples_end - samples) /  (st + 1)) {

  1367.             av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");

  1368.             return -1;

  1369.         }

  1370. 

  1371.         for (ch = 0; ch <= st; ch++) {

  1372.             samples = (unsigned short *) data + ch;

  1373. 

  1374.             /* Read in every sample for this channel.  */

  1375.             for (i = 0; i < samplecnt / 14; i++) {

  1376.                 int index = (*src >> 4) & 7;

  1377.                 unsigned int exp = 28 - (*src++ & 15);

  1378.                 int factor1 = table[ch][index * 2];

  1379.                 int factor2 = table[ch][index * 2 + 1];

  1380. 

  1381.                 /* Decode 14 samples.  */

  1382.                 for (n = 0; n < 14; n++) {

  1383.                     int32_t sampledat;

  1384.                     if(n&1) sampledat=  *src++    <<28;

  1385.                     else    sampledat= (*src&0xF0)<<24;

  1386. 

  1387.                     sampledat = ((prev[ch][0]*factor1

  1388.                                 + prev[ch][1]*factor2) >> 11) + (sampledat>>exp);

  1389.                     sampledat = av_clip_int16(sampledat);

  1390.                     *samples = sampledat;

  1391.                     prev[ch][1] = prev[ch][0];

  1392.                     prev[ch][0] = *samples++;

  1393. 

  1394.                     /* In case of stereo, skip one sample, this sample

  1395.                        is for the other channel.  */

  1396.                     samples += st;

  1397.                 }

  1398.             }

  1399.         }

  1400. 

  1401.         /* In the previous loop, in case stereo is used, samples is

  1402.            increased exactly one time too often.  */

  1403.         samples -= st;

  1404.         break;

  1405.     }

  1406. 

  1407.     default:

  1408.         return -1;

  1409.     }

  1410.     *data_size = (uint8_t *)samples - (uint8_t *)data;

  1411.     return src - buf;

  1412. }

  1413. 

  1414. 

  1415. 

  1416. #ifdef CONFIG_ENCODERS

  1417. #define ADPCM_ENCODER(id,name)                  \

  1418. AVCodec name ## _encoder = {                    \

  1419.     #name,                                      \

  1420.     CODEC_TYPE_AUDIO,                           \

  1421.     id,                                         \

  1422.     sizeof(ADPCMContext),                       \

  1423.     adpcm_encode_init,                          \

  1424.     adpcm_encode_frame,                         \

  1425.     adpcm_encode_close,                         \

  1426.     NULL,                                       \

  1427. };

  1428. #else

  1429. #define ADPCM_ENCODER(id,name)

  1430. #endif

  1431. 

  1432. #ifdef CONFIG_DECODERS

  1433. #define ADPCM_DECODER(id,name)                  \

  1434. AVCodec name ## _decoder = {                    \

  1435.     #name,                                      \

  1436.     CODEC_TYPE_AUDIO,                           \

  1437.     id,                                         \

  1438.     sizeof(ADPCMContext),                       \

  1439.     adpcm_decode_init,                          \

  1440.     NULL,                                       \

  1441.     NULL,                                       \

  1442.     adpcm_decode_frame,                         \

  1443. };

  1444. #else

  1445. #define ADPCM_DECODER(id,name)

  1446. #endif

  1447. 

  1448. #define ADPCM_CODEC(id, name)                   \

  1449. ADPCM_ENCODER(id,name) ADPCM_DECODER(id,name)

  1450. 

  1451. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);

  1452. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);

  1453. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);

  1454. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);

  1455. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws);

  1456. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg);

  1457. ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);

  1458. ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);

  1459. ADPCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa);

  1460. ADPCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);

  1461. ADPCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);

  1462. ADPCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);

  1463. ADPCM_CODEC(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha);

  1464. ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4);

  1465. ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3);

  1466. ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);

  1467. ADPCM_CODEC(CODEC_ID_ADPCM_THP, adpcm_thp);

  1468. 

  1469. #undef ADPCM_CODEC