falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
10676 Commits
32 Branches
593MB
Tree: 73b46a95d2
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '73b46a95d2'
${ noResults }
FFmpeg/libavcodec/adpcm.c

1458 lines
51KB
Raw Blame History 

  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 += ((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. 

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

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

  234. 

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

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

  237. 

  238.     return nibble;

  239. }

  240. 

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

  242. {

  243.     int nibble, delta;

  244. 

  245.     if(!c->step) {

  246.         c->predictor = 0;

  247.         c->step = 127;

  248.     }

  249. 

  250.     delta = sample - c->predictor;

  251. 

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

  253. 

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

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

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

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

  258. 

  259.     return nibble;

  260. }

  261. 

  262. typedef struct TrellisPath {

  263.     int nibble;

  264.     int prev;

  265. } TrellisPath;

  266. 

  267. typedef struct TrellisNode {

  268.     uint32_t ssd;

  269.     int path;

  270.     int sample1;

  271.     int sample2;

  272.     int step;

  273. } TrellisNode;

  274. 

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

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

  277. {

  278. #define FREEZE_INTERVAL 128

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

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

  281.     const int stride = avctx->channels;

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

  283.     const int max_paths = frontier*FREEZE_INTERVAL;

  284.     TrellisPath paths[max_paths], *p;

  285.     TrellisNode node_buf[2][frontier];

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

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

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

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

  290. 

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

  292. 

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

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

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

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

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

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

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

  300.     if((version == CODEC_ID_ADPCM_IMA_WAV) || (version == CODEC_ID_ADPCM_SWF))

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

  302.     if(version == CODEC_ID_ADPCM_MS)

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

  304.     if(version == CODEC_ID_ADPCM_YAMAHA) {

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

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

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

  308.         } else {

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

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

  311.         }

  312.     }

  313. 

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

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

  316.         TrellisNode **u;

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

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

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

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

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

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

  323.             int nidx;

  324.             if(version == CODEC_ID_ADPCM_MS) {

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

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

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

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

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

  330.                     const int nibble = nidx & 0xf;

  331.                     int dec_sample = predictor + nidx * step;

  332. #define STORE_NODE(NAME, STEP_INDEX)\

  333.                     int d;\

  334.                     uint32_t ssd;\

  335.                     dec_sample = av_clip_int16(dec_sample);\

  336.                     d = sample - dec_sample;\

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

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

  339.                         continue;\

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

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

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

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

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

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

  346.                             goto next_##NAME;\

  347.                         }\

  348.                     }\

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

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

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

  352.                             if(!u) {\

  353.                                 assert(pathn < max_paths);\

  354.                                 u = t++;\

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

  356.                             }\

  357.                             u->ssd = ssd;\

  358.                             u->step = STEP_INDEX;\

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

  360.                             u->sample1 = dec_sample;\

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

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

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

  364.                             nodes_next[k] = u;\

  365.                             break;\

  366.                         }\

  367.                     }\

  368.                     next_##NAME:;

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

  370.                 }

  371.             } else if((version == CODEC_ID_ADPCM_IMA_WAV)|| (version == CODEC_ID_ADPCM_SWF)) {

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

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

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

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

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

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

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

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

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

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

  382.                     STORE_NODE(NAME, STEP_INDEX);\

  383.                 }

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

  385.             } else { //CODEC_ID_ADPCM_YAMAHA

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

  387. #undef LOOP_NODES

  388. #undef STORE_NODE

  389.             }

  390.         }

  391. 

  392.         u = nodes;

  393.         nodes = nodes_next;

  394.         nodes_next = u;

  395. 

  396.         // prevent overflow

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

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

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

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

  401.         }

  402. 

  403.         // merge old paths to save memory

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

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

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

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

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

  409.             }

  410.             froze = i;

  411.             pathn = 0;

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

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

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

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

  416.         }

  417.     }

  418. 

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

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

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

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

  423.     }

  424. 

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

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

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

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

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

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

  431. }

  432. 

  433. static int adpcm_encode_frame(AVCodecContext *avctx,

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

  435. {

  436.     int n, i, st;

  437.     short *samples;

  438.     unsigned char *dst;

  439.     ADPCMContext *c = avctx->priv_data;

  440. 

  441.     dst = frame;

  442.     samples = (short *)data;

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

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

  445. 

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

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

  448.         break;

  449.     case CODEC_ID_ADPCM_IMA_WAV:

  450.         n = avctx->frame_size / 8;

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

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

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

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

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

  456.             samples++;

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

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

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

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

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

  462.                 *dst++ = 0;

  463.                 samples++;

  464.             }

  465. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  482.                     }

  483.                 }

  484.             } else

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

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

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

  488.                 dst++;

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

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

  491.                 dst++;

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

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

  494.                 dst++;

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

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

  497.                 dst++;

  498.                 /* right channel */

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

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

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

  502.                     dst++;

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

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

  505.                     dst++;

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

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

  508.                     dst++;

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

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

  511.                     dst++;

  512.                 }

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

  514.             }

  515.         break;

  516.     case CODEC_ID_ADPCM_SWF:

  517.     {

  518.         int i;

  519.         PutBitContext pb;

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

  521. 

  522.         n = avctx->frame_size-1;

  523. 

  524.         //Store AdpcmCodeSize

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

  526. 

  527.         //Init the encoder state

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

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

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

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

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

  533.         }

  534. 

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

  536.             uint8_t buf[2][n];

  537.             adpcm_compress_trellis(avctx, samples+2, buf[0], &c->status[0], n);

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

  539.                 adpcm_compress_trellis(avctx, samples+3, buf[1], &c->status[1], n);

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

  541.                 put_bits(&pb, 4, buf[0][i]);

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

  543.                     put_bits(&pb, 4, buf[1][i]);

  544.             }

  545.         } else {

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

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

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

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

  550.             }

  551.         }

  552.         flush_put_bits(&pb);

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

  554.         break;

  555.     }

  556.     case CODEC_ID_ADPCM_MS:

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

  558.             int predictor=0;

  559. 

  560.             *dst++ = predictor;

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

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

  563.         }

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

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

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

  567. 

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

  569.         }

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

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

  572. 

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

  574.         }

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

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

  577. 

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

  579.         }

  580. 

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

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

  583.             uint8_t buf[2][n];

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

  585.                 n *= 2;

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

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

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

  589.             } else {

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

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

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

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

  594.             }

  595.         } else

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

  597.             int nibble;

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

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

  600.             *dst++ = nibble;

  601.         }

  602.         break;

  603.     case CODEC_ID_ADPCM_YAMAHA:

  604.         n = avctx->frame_size / 2;

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

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

  607.             n *= 2;

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

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

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

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

  612.             } else {

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

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

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

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

  617.             }

  618.         } else

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

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

  621.                 int nibble;

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

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

  624.                 *dst++ = nibble;

  625.             }

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

  627.         }

  628.         break;

  629.     default:

  630.         return -1;

  631.     }

  632.     return dst - frame;

  633. }

  634. #endif //CONFIG_ENCODERS

  635. 

  636. static int adpcm_decode_init(AVCodecContext * avctx)

  637. {

  638.     ADPCMContext *c = avctx->priv_data;

  639. 

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

  641.         return -1;

  642.     }

  643. 

  644.     c->channel = 0;

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

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

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

  648. 

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

  650.     case CODEC_ID_ADPCM_CT:

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

  652.         break;

  653.     case CODEC_ID_ADPCM_IMA_WS:

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

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

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

  657.         }

  658.         break;

  659.     default:

  660.         break;

  661.     }

  662.     return 0;

  663. }

  664. 

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

  666. {

  667.     int step_index;

  668.     int predictor;

  669.     int sign, delta, diff, step;

  670. 

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

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

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

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

  675. 

  676.     sign = nibble & 8;

  677.     delta = nibble & 7;

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

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

  680.      * quickly enough */

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

  682.     predictor = c->predictor;

  683.     if (sign) predictor -= diff;

  684.     else predictor += diff;

  685. 

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

  687.     c->step_index = step_index;

  688. 

  689.     return (short)c->predictor;

  690. }

  691. 

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

  693. {

  694.     int predictor;

  695. 

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

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

  698. 

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

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

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

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

  703. 

  704.     return c->sample1;

  705. }

  706. 

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

  708. {

  709.     int sign, delta, diff;

  710.     int new_step;

  711. 

  712.     sign = nibble & 8;

  713.     delta = nibble & 7;

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

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

  716.      * quickly enough */

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

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

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

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

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

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

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

  724. 

  725.     return (short)c->predictor;

  726. }

  727. 

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

  729. {

  730.     int sign, delta, diff;

  731. 

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

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

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

  735. 

  736.     /* clamp result */

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

  738. 

  739.     /* calculate new step */

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

  741.         c->step++;

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

  743.         c->step--;

  744. 

  745.     return (short) c->predictor;

  746. }

  747. 

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

  749. {

  750.     if(!c->step) {

  751.         c->predictor = 0;

  752.         c->step = 127;

  753.     }

  754. 

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

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

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

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

  759.     return c->predictor;

  760. }

  761. 

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

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

  764. {

  765.     int i, j;

  766.     int shift,filter,f0,f1;

  767.     int s_1,s_2;

  768.     int d,s,t;

  769. 

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

  771. 

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

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

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

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

  776. 

  777.         s_1 = left->sample1;

  778.         s_2 = left->sample2;

  779. 

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

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

  782. 

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

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

  785.             s_2 = s_1;

  786.             s_1 = av_clip_int16(s);

  787.             *out = s_1;

  788.             out += inc;

  789.         }

  790. 

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

  792.             left->sample1 = s_1;

  793.             left->sample2 = s_2;

  794.             s_1 = right->sample1;

  795.             s_2 = right->sample2;

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

  797.         }

  798. 

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

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

  801. 

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

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

  804. 

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

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

  807. 

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

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

  810.             s_2 = s_1;

  811.             s_1 = av_clip_int16(s);

  812.             *out = s_1;

  813.             out += inc;

  814.         }

  815. 

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

  817.             right->sample1 = s_1;

  818.             right->sample2 = s_2;

  819.             out -= 1;

  820.         } else {

  821.             left->sample1 = s_1;

  822.             left->sample2 = s_2;

  823.         }

  824.     }

  825. }

  826. 

  827. 

  828. /* DK3 ADPCM support macro */

  829. #define DK3_GET_NEXT_NIBBLE() \

  830.     if (decode_top_nibble_next) \

  831.     { \

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

  833.         decode_top_nibble_next = 0; \

  834.     } \

  835.     else \

  836.     { \

  837.         last_byte = *src++; \

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

  839.         nibble = last_byte & 0x0F; \

  840.         decode_top_nibble_next = 1; \

  841.     }

  842. 

  843. static int adpcm_decode_frame(AVCodecContext *avctx,

  844.                             void *data, int *data_size,

  845.                             uint8_t *buf, int buf_size)

  846. {

  847.     ADPCMContext *c = avctx->priv_data;

  848.     ADPCMChannelStatus *cs;

  849.     int n, m, channel, i;

  850.     int block_predictor[2];

  851.     short *samples;

  852.     short *samples_end;

  853.     uint8_t *src;

  854.     int st; /* stereo */

  855. 

  856.     /* DK3 ADPCM accounting variables */

  857.     unsigned char last_byte = 0;

  858.     unsigned char nibble;

  859.     int decode_top_nibble_next = 0;

  860.     int diff_channel;

  861. 

  862.     /* EA ADPCM state variables */

  863.     uint32_t samples_in_chunk;

  864.     int32_t previous_left_sample, previous_right_sample;

  865.     int32_t current_left_sample, current_right_sample;

  866.     int32_t next_left_sample, next_right_sample;

  867.     int32_t coeff1l, coeff2l, coeff1r, coeff2r;

  868.     uint8_t shift_left, shift_right;

  869.     int count1, count2;

  870. 

  871.     if (!buf_size)

  872.         return 0;

  873. 

  874.     //should protect all 4bit ADPCM variants

  875.     //8 is needed for CODEC_ID_ADPCM_IMA_WAV with 2 channels

  876.     //

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

  878.         return -1;

  879. 

  880.     samples = data;

  881.     samples_end= samples + *data_size/2;

  882.     *data_size= 0;

  883.     src = buf;

  884. 

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

  886. 

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

  888.     case CODEC_ID_ADPCM_IMA_QT:

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

  890.         channel = c->channel;

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

  892.         /* (pppppp) (piiiiiii) */

  893. 

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

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

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

  897.         cs->predictor &= 0xFF80;

  898. 

  899.         /* sign extension */

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

  901.             cs->predictor -= 0x10000;

  902. 

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

  904. 

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

  906. 

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

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

  909.             cs->step_index = 88;

  910.         }

  911. 

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

  913. 

  914.         if (st && channel)

  915.             samples++;

  916. 

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

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

  919.             samples += avctx->channels;

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

  921.             samples += avctx->channels;

  922.             src ++;

  923.         }

  924. 

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

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

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

  928.                 return src - buf;

  929.             }

  930.         }

  931.         break;

  932.     case CODEC_ID_ADPCM_IMA_WAV:

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

  934.             buf_size = avctx->block_align;

  935. 

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

  937. 

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

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

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

  941.             src+=2;

  942. 

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

  944. 

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

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

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

  948.                 cs->step_index = 88;

  949.             }

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

  951.         }

  952. 

  953.         while(src < buf + buf_size){

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

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

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

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

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

  959.                 src++;

  960.             }

  961.             src += 4*st;

  962.         }

  963.         break;

  964.     case CODEC_ID_ADPCM_4XM:

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

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

  967.         if(st){

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

  969.         }

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

  971.         if(st){

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

  973.         }

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

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

  976. 

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

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

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

  980.             if (st)

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

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

  983.             if (st)

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

  985.         }

  986. 

  987.         src += m<<st;

  988. 

  989.         break;

  990.     case CODEC_ID_ADPCM_MS:

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

  992.             buf_size = avctx->block_align;

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

  994.         if (n < 0)

  995.             return -1;

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

  997.         block_predictor[1] = 0;

  998.         if (st)

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

  1000.         c->status[0].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1001.         src+=2;

  1002.         if (st){

  1003.             c->status[1].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1004.             src+=2;

  1005.         }

  1006.         c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];

  1007.         c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];

  1008.         c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];

  1009.         c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];

  1010. 

  1011.         c->status[0].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1012.         src+=2;

  1013.         if (st) c->status[1].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1014.         if (st) src+=2;

  1015.         c->status[0].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1016.         src+=2;

  1017.         if (st) c->status[1].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));

  1018.         if (st) src+=2;

  1019. 

  1020.         *samples++ = c->status[0].sample1;

  1021.         if (st) *samples++ = c->status[1].sample1;

  1022.         *samples++ = c->status[0].sample2;

  1023.         if (st) *samples++ = c->status[1].sample2;

  1024.         for(;n>0;n--) {

  1025.             *samples++ = adpcm_ms_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);

  1026.             *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);

  1027.             src ++;

  1028.         }

  1029.         break;

  1030.     case CODEC_ID_ADPCM_IMA_DK4:

  1031.         if (avctx->block_align != 0 && buf_size > avctx->block_align)

  1032.             buf_size = avctx->block_align;

  1033. 

  1034.         c->status[0].predictor = (int16_t)(src[0] | (src[1] << 8));

  1035.         c->status[0].step_index = src[2];

  1036.         src += 4;

  1037.         *samples++ = c->status[0].predictor;

  1038.         if (st) {

  1039.             c->status[1].predictor = (int16_t)(src[0] | (src[1] << 8));

  1040.             c->status[1].step_index = src[2];

  1041.             src += 4;

  1042.             *samples++ = c->status[1].predictor;

  1043.         }

  1044.         while (src < buf + buf_size) {

  1045. 

  1046.             /* take care of the top nibble (always left or mono channel) */

  1047.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1048.                 (src[0] >> 4) & 0x0F, 3);

  1049. 

  1050.             /* take care of the bottom nibble, which is right sample for

  1051.              * stereo, or another mono sample */

  1052.             if (st)

  1053.                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],

  1054.                     src[0] & 0x0F, 3);

  1055.             else

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

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

  1058. 

  1059.             src++;

  1060.         }

  1061.         break;

  1062.     case CODEC_ID_ADPCM_IMA_DK3:

  1063.         if (avctx->block_align != 0 && buf_size > avctx->block_align)

  1064.             buf_size = avctx->block_align;

  1065. 

  1066.         if(buf_size + 16 > (samples_end - samples)*3/8)

  1067.             return -1;

  1068. 

  1069.         c->status[0].predictor = (int16_t)(src[10] | (src[11] << 8));

  1070.         c->status[1].predictor = (int16_t)(src[12] | (src[13] << 8));

  1071.         c->status[0].step_index = src[14];

  1072.         c->status[1].step_index = src[15];

  1073.         /* sign extend the predictors */

  1074.         src += 16;

  1075.         diff_channel = c->status[1].predictor;

  1076. 

  1077.         /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when

  1078.          * the buffer is consumed */

  1079.         while (1) {

  1080. 

  1081.             /* for this algorithm, c->status[0] is the sum channel and

  1082.              * c->status[1] is the diff channel */

  1083. 

  1084.             /* process the first predictor of the sum channel */

  1085.             DK3_GET_NEXT_NIBBLE();

  1086.             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

  1087. 

  1088.             /* process the diff channel predictor */

  1089.             DK3_GET_NEXT_NIBBLE();

  1090.             adpcm_ima_expand_nibble(&c->status[1], nibble, 3);

  1091. 

  1092.             /* process the first pair of stereo PCM samples */

  1093.             diff_channel = (diff_channel + c->status[1].predictor) / 2;

  1094.             *samples++ = c->status[0].predictor + c->status[1].predictor;

  1095.             *samples++ = c->status[0].predictor - c->status[1].predictor;

  1096. 

  1097.             /* process the second predictor of the sum channel */

  1098.             DK3_GET_NEXT_NIBBLE();

  1099.             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);

  1100. 

  1101.             /* process the second 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.         break;

  1107.     case CODEC_ID_ADPCM_IMA_WS:

  1108.         /* no per-block initialization; just start decoding the data */

  1109.         while (src < buf + buf_size) {

  1110. 

  1111.             if (st) {

  1112.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1113.                     (src[0] >> 4) & 0x0F, 3);

  1114.                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],

  1115.                     src[0] & 0x0F, 3);

  1116.             } else {

  1117.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1118.                     (src[0] >> 4) & 0x0F, 3);

  1119.                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1120.                     src[0] & 0x0F, 3);

  1121.             }

  1122. 

  1123.             src++;

  1124.         }

  1125.         break;

  1126.     case CODEC_ID_ADPCM_XA:

  1127.         c->status[0].sample1 = c->status[0].sample2 =

  1128.         c->status[1].sample1 = c->status[1].sample2 = 0;

  1129.         while (buf_size >= 128) {

  1130.             xa_decode(samples, src, &c->status[0], &c->status[1],

  1131.                 avctx->channels);

  1132.             src += 128;

  1133.             samples += 28 * 8;

  1134.             buf_size -= 128;

  1135.         }

  1136.         break;

  1137.     case CODEC_ID_ADPCM_EA:

  1138.         samples_in_chunk = AV_RL32(src);

  1139.         if (samples_in_chunk >= ((buf_size - 12) * 2)) {

  1140.             src += buf_size;

  1141.             break;

  1142.         }

  1143.         src += 4;

  1144.         current_left_sample = (int16_t)AV_RL16(src);

  1145.         src += 2;

  1146.         previous_left_sample = (int16_t)AV_RL16(src);

  1147.         src += 2;

  1148.         current_right_sample = (int16_t)AV_RL16(src);

  1149.         src += 2;

  1150.         previous_right_sample = (int16_t)AV_RL16(src);

  1151.         src += 2;

  1152. 

  1153.         for (count1 = 0; count1 < samples_in_chunk/28;count1++) {

  1154.             coeff1l = ea_adpcm_table[(*src >> 4) & 0x0F];

  1155.             coeff2l = ea_adpcm_table[((*src >> 4) & 0x0F) + 4];

  1156.             coeff1r = ea_adpcm_table[*src & 0x0F];

  1157.             coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];

  1158.             src++;

  1159. 

  1160.             shift_left = ((*src >> 4) & 0x0F) + 8;

  1161.             shift_right = (*src & 0x0F) + 8;

  1162.             src++;

  1163. 

  1164.             for (count2 = 0; count2 < 28; count2++) {

  1165.                 next_left_sample = (((*src & 0xF0) << 24) >> shift_left);

  1166.                 next_right_sample = (((*src & 0x0F) << 28) >> shift_right);

  1167.                 src++;

  1168. 

  1169.                 next_left_sample = (next_left_sample +

  1170.                     (current_left_sample * coeff1l) +

  1171.                     (previous_left_sample * coeff2l) + 0x80) >> 8;

  1172.                 next_right_sample = (next_right_sample +

  1173.                     (current_right_sample * coeff1r) +

  1174.                     (previous_right_sample * coeff2r) + 0x80) >> 8;

  1175. 

  1176.                 previous_left_sample = current_left_sample;

  1177.                 current_left_sample = av_clip_int16(next_left_sample);

  1178.                 previous_right_sample = current_right_sample;

  1179.                 current_right_sample = av_clip_int16(next_right_sample);

  1180.                 *samples++ = (unsigned short)current_left_sample;

  1181.                 *samples++ = (unsigned short)current_right_sample;

  1182.             }

  1183.         }

  1184.         break;

  1185.     case CODEC_ID_ADPCM_IMA_SMJPEG:

  1186.         c->status[0].predictor = *src;

  1187.         src += 2;

  1188.         c->status[0].step_index = *src++;

  1189.         src++;  /* skip another byte before getting to the meat */

  1190.         while (src < buf + buf_size) {

  1191.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1192.                 *src & 0x0F, 3);

  1193.             *samples++ = adpcm_ima_expand_nibble(&c->status[0],

  1194.                 (*src >> 4) & 0x0F, 3);

  1195.             src++;

  1196.         }

  1197.         break;

  1198.     case CODEC_ID_ADPCM_CT:

  1199.         while (src < buf + buf_size) {

  1200.             if (st) {

  1201.                 *samples++ = adpcm_ct_expand_nibble(&c->status[0],

  1202.                     (src[0] >> 4) & 0x0F);

  1203.                 *samples++ = adpcm_ct_expand_nibble(&c->status[1],

  1204.                     src[0] & 0x0F);

  1205.             } else {

  1206.                 *samples++ = adpcm_ct_expand_nibble(&c->status[0],

  1207.                     (src[0] >> 4) & 0x0F);

  1208.                 *samples++ = adpcm_ct_expand_nibble(&c->status[0],

  1209.                     src[0] & 0x0F);

  1210.             }

  1211.             src++;

  1212.         }

  1213.         break;

  1214.     case CODEC_ID_ADPCM_SBPRO_4:

  1215.     case CODEC_ID_ADPCM_SBPRO_3:

  1216.     case CODEC_ID_ADPCM_SBPRO_2:

  1217.         if (!c->status[0].step_index) {

  1218.             /* the first byte is a raw sample */

  1219.             *samples++ = 128 * (*src++ - 0x80);

  1220.             if (st)

  1221.               *samples++ = 128 * (*src++ - 0x80);

  1222.             c->status[0].step_index = 1;

  1223.         }

  1224.         if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {

  1225.             while (src < buf + buf_size) {

  1226.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1227.                     (src[0] >> 4) & 0x0F, 4, 0);

  1228.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1229.                     src[0] & 0x0F, 4, 0);

  1230.                 src++;

  1231.             }

  1232.         } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {

  1233.             while (src < buf + buf_size && samples + 2 < samples_end) {

  1234.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1235.                     (src[0] >> 5) & 0x07, 3, 0);

  1236.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1237.                     (src[0] >> 2) & 0x07, 3, 0);

  1238.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1239.                     src[0] & 0x03, 2, 0);

  1240.                 src++;

  1241.             }

  1242.         } else {

  1243.             while (src < buf + buf_size && samples + 3 < samples_end) {

  1244.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1245.                     (src[0] >> 6) & 0x03, 2, 2);

  1246.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1247.                     (src[0] >> 4) & 0x03, 2, 2);

  1248.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],

  1249.                     (src[0] >> 2) & 0x03, 2, 2);

  1250.                 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],

  1251.                     src[0] & 0x03, 2, 2);

  1252.                 src++;

  1253.             }

  1254.         }

  1255.         break;

  1256.     case CODEC_ID_ADPCM_SWF:

  1257.     {

  1258.         GetBitContext gb;

  1259.         const int *table;

  1260.         int k0, signmask, nb_bits, count;

  1261.         int size = buf_size*8;

  1262. 

  1263.         init_get_bits(&gb, buf, size);

  1264. 

  1265.         //read bits & initial values

  1266.         nb_bits = get_bits(&gb, 2)+2;

  1267.         //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);

  1268.         table = swf_index_tables[nb_bits-2];

  1269.         k0 = 1 << (nb_bits-2);

  1270.         signmask = 1 << (nb_bits-1);

  1271. 

  1272.         while (get_bits_count(&gb) <= size - 22*avctx->channels) {

  1273.             for (i = 0; i < avctx->channels; i++) {

  1274.                 *samples++ = c->status[i].predictor = get_sbits(&gb, 16);

  1275.                 c->status[i].step_index = get_bits(&gb, 6);

  1276.             }

  1277. 

  1278.             for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {

  1279.                 int i;

  1280. 

  1281.                 for (i = 0; i < avctx->channels; i++) {

  1282.                     // similar to IMA adpcm

  1283.                     int delta = get_bits(&gb, nb_bits);

  1284.                     int step = step_table[c->status[i].step_index];

  1285.                     long vpdiff = 0; // vpdiff = (delta+0.5)*step/4

  1286.                     int k = k0;

  1287. 

  1288.                     do {

  1289.                         if (delta & k)

  1290.                             vpdiff += step;

  1291.                         step >>= 1;

  1292.                         k >>= 1;

  1293.                     } while(k);

  1294.                     vpdiff += step;

  1295. 

  1296.                     if (delta & signmask)

  1297.                         c->status[i].predictor -= vpdiff;

  1298.                     else

  1299.                         c->status[i].predictor += vpdiff;

  1300. 

  1301.                     c->status[i].step_index += table[delta & (~signmask)];

  1302. 

  1303.                     c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);

  1304.                     c->status[i].predictor = av_clip_int16(c->status[i].predictor);

  1305. 

  1306.                     *samples++ = c->status[i].predictor;

  1307.                     if (samples >= samples_end) {

  1308.                         av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");

  1309.                         return -1;

  1310.                     }

  1311.                 }

  1312.             }

  1313.         }

  1314.         src += buf_size;

  1315.         break;

  1316.     }

  1317.     case CODEC_ID_ADPCM_YAMAHA:

  1318.         while (src < buf + buf_size) {

  1319.             if (st) {

  1320.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],

  1321.                         src[0] & 0x0F);

  1322.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[1],

  1323.                         (src[0] >> 4) & 0x0F);

  1324.             } else {

  1325.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],

  1326.                         src[0] & 0x0F);

  1327.                 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],

  1328.                         (src[0] >> 4) & 0x0F);

  1329.             }

  1330.             src++;

  1331.         }

  1332.         break;

  1333.     case CODEC_ID_ADPCM_THP:

  1334.     {

  1335.         int table[2][16];

  1336.         unsigned int samplecnt;

  1337.         int prev[2][2];

  1338.         int ch;

  1339. 

  1340.         if (buf_size < 80) {

  1341.             av_log(avctx, AV_LOG_ERROR, "frame too small\n");

  1342.             return -1;

  1343.         }

  1344. 

  1345.         src+=4;

  1346.         samplecnt = bytestream_get_be32(&src);

  1347. 

  1348.         for (i = 0; i < 32; i++)

  1349.             table[0][i] = (int16_t)bytestream_get_be16(&src);

  1350. 

  1351.         /* Initialize the previous sample.  */

  1352.         for (i = 0; i < 4; i++)

  1353.             prev[0][i] = (int16_t)bytestream_get_be16(&src);

  1354. 

  1355.         if (samplecnt >= (samples_end - samples) /  (st + 1)) {

  1356.             av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");

  1357.             return -1;

  1358.         }

  1359. 

  1360.         for (ch = 0; ch <= st; ch++) {

  1361.             samples = (unsigned short *) data + ch;

  1362. 

  1363.             /* Read in every sample for this channel.  */

  1364.             for (i = 0; i < samplecnt / 14; i++) {

  1365.                 int index = (*src >> 4) & 7;

  1366.                 unsigned int exp = 28 - (*src++ & 15);

  1367.                 int factor1 = table[ch][index * 2];

  1368.                 int factor2 = table[ch][index * 2 + 1];

  1369. 

  1370.                 /* Decode 14 samples.  */

  1371.                 for (n = 0; n < 14; n++) {

  1372.                     int32_t sampledat;

  1373.                     if(n&1) sampledat=  *src++    <<28;

  1374.                     else    sampledat= (*src&0xF0)<<24;

  1375. 

  1376.                     sampledat = ((prev[ch][0]*factor1

  1377.                                 + prev[ch][1]*factor2) >> 11) + (sampledat>>exp);

  1378.                     *samples = av_clip_int16(sampledat);

  1379.                     prev[ch][1] = prev[ch][0];

  1380.                     prev[ch][0] = *samples++;

  1381. 

  1382.                     /* In case of stereo, skip one sample, this sample

  1383.                        is for the other channel.  */

  1384.                     samples += st;

  1385.                 }

  1386.             }

  1387.         }

  1388. 

  1389.         /* In the previous loop, in case stereo is used, samples is

  1390.            increased exactly one time too often.  */

  1391.         samples -= st;

  1392.         break;

  1393.     }

  1394. 

  1395.     default:

  1396.         return -1;

  1397.     }

  1398.     *data_size = (uint8_t *)samples - (uint8_t *)data;

  1399.     return src - buf;

  1400. }

  1401. 

  1402. 

  1403. 

  1404. #ifdef CONFIG_ENCODERS

  1405. #define ADPCM_ENCODER(id,name)                  \

  1406. AVCodec name ## _encoder = {                    \

  1407.     #name,                                      \

  1408.     CODEC_TYPE_AUDIO,                           \

  1409.     id,                                         \

  1410.     sizeof(ADPCMContext),                       \

  1411.     adpcm_encode_init,                          \

  1412.     adpcm_encode_frame,                         \

  1413.     adpcm_encode_close,                         \

  1414.     NULL,                                       \

  1415. };

  1416. #else

  1417. #define ADPCM_ENCODER(id,name)

  1418. #endif

  1419. 

  1420. #ifdef CONFIG_DECODERS

  1421. #define ADPCM_DECODER(id,name)                  \

  1422. AVCodec name ## _decoder = {                    \

  1423.     #name,                                      \

  1424.     CODEC_TYPE_AUDIO,                           \

  1425.     id,                                         \

  1426.     sizeof(ADPCMContext),                       \

  1427.     adpcm_decode_init,                          \

  1428.     NULL,                                       \

  1429.     NULL,                                       \

  1430.     adpcm_decode_frame,                         \

  1431. };

  1432. #else

  1433. #define ADPCM_DECODER(id,name)

  1434. #endif

  1435. 

  1436. #define ADPCM_CODEC(id, name)                   \

  1437. ADPCM_ENCODER(id,name) ADPCM_DECODER(id,name)

  1438. 

  1439. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);

  1440. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);

  1441. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);

  1442. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);

  1443. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws);

  1444. ADPCM_CODEC(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg);

  1445. ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);

  1446. ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);

  1447. ADPCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa);

  1448. ADPCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);

  1449. ADPCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);

  1450. ADPCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);

  1451. ADPCM_CODEC(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha);

  1452. ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4);

  1453. ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3);

  1454. ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);

  1455. ADPCM_CODEC(CODEC_ID_ADPCM_THP, adpcm_thp);

  1456. 

  1457. #undef ADPCM_CODEC