libavcodec/adpcm.c

   1 /*
   2  * ADPCM codecs
   3  * Copyright (c) 2001-2003 The ffmpeg Project
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include "avcodec.h"
  20
  21 /**
  22  * @file adpcm.c
  23  * ADPCM codecs.
  24  * First version by Francois Revol (revol@free.fr)
  25  * Fringe ADPCM codecs (e.g., DK3, DK4, Westwood)
  26  *   by Mike Melanson (melanson@pcisys.net)
  27  * CD-ROM XA ADPCM codec by BERO
  28  * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)
  29  *
  30  * Features and limitations:
  31  *
  32  * Reference documents:
  33  * http://www.pcisys.net/~melanson/codecs/simpleaudio.html
  34  * http://www.geocities.com/SiliconValley/8682/aud3.txt
  35  * http://openquicktime.sourceforge.net/plugins.htm
  36  * XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
  37  * http://www.cs.ucla.edu/~leec/mediabench/applications.html
  38  * SoX source code http://home.sprynet.com/~cbagwell/sox.html
  39  *
  40  * CD-ROM XA:
  41  * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html
  42  * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html
  43  * readstr http://www.geocities.co.jp/Playtown/2004/
  44  */
  45
  46 #define BLKSIZE 1024
  47
  48 #define CLAMP_TO_SHORT(value) \
  49 if (value > 32767) \
  50     value = 32767; \
  51 else if (value < -32768) \
  52     value = -32768; \
  53
  54 /* step_table[] and index_table[] are from the ADPCM reference source */
  55 /* This is the index table: */
  56 static const int index_table[16] = {
  57     -1, -1, -1, -1, 2, 4, 6, 8,
  58     -1, -1, -1, -1, 2, 4, 6, 8,
  59 };
  60
  61 /**
  62  * This is the step table. Note that many programs use slight deviations from
  63  * this table, but such deviations are negligible:
  64  */
  65 static const int step_table[89] = {
  66     7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
  67     19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
  68     50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
  69     130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
  70     337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
  71     876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
  72     2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
  73     5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
  74     15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
  75 };
  76
  77 /* These are for MS-ADPCM */
  78 /* AdaptationTable[], AdaptCoeff1[], and AdaptCoeff2[] are from libsndfile */
  79 static const int AdaptationTable[] = {
  80         230, 230, 230, 230, 307, 409, 512, 614,
  81         768, 614, 512, 409, 307, 230, 230, 230
  82 };
  83
  84 static const int AdaptCoeff1[] = {
  85         256, 512, 0, 192, 240, 460, 392
  86 };
  87
  88 static const int AdaptCoeff2[] = {
  89         0, -256, 0, 64, 0, -208, -232
  90 };
  91
  92 /* These are for CD-ROM XA ADPCM */
  93 static const int xa_adpcm_table[5][2] = {
  94    {   0,   0 },
  95    {  60,   0 },
  96    { 115, -52 },
  97    {  98, -55 },
  98    { 122, -60 }
  99 };
 100
 101 static int ea_adpcm_table[] = {
 102     0, 240, 460, 392, 0, 0, -208, -220, 0, 1,
 103     3, 4, 7, 8, 10, 11, 0, -1, -3, -4
 104 };
 105
 106 /* end of tables */
 107
 108 typedef struct ADPCMChannelStatus {
 109     int predictor;
 110     short int step_index;
 111     int step;
 112     /* for encoding */
 113     int prev_sample;
 114
 115     /* MS version */
 116     short sample1;
 117     short sample2;
 118     int coeff1;
 119     int coeff2;
 120     int idelta;
 121 } ADPCMChannelStatus;
 122
 123 typedef struct ADPCMContext {
 124     int channel; /* for stereo MOVs, decode left, then decode right, then tell it's decoded */
 125     ADPCMChannelStatus status[2];
 126     short sample_buffer[32]; /* hold left samples while waiting for right samples */
 127 } ADPCMContext;
 128
 129 /* XXX: implement encoding */
 130
 131 #ifdef CONFIG_ENCODERS
 132 static int adpcm_encode_init(AVCodecContext *avctx)
 133 {
 134     if (avctx->channels > 2)
 135         return -1; /* only stereo or mono =) */
 136     switch(avctx->codec->id) {
 137     case CODEC_ID_ADPCM_IMA_QT:
 138         av_log(avctx, AV_LOG_ERROR, "ADPCM: codec adpcm_ima_qt unsupported for encoding !\n");
 139         avctx->frame_size = 64; /* XXX: can multiple of avctx->channels * 64 (left and right blocks are interleaved) */
 140         return -1;
 141         break;
 142     case CODEC_ID_ADPCM_IMA_WAV:
 143         avctx->frame_size = (BLKSIZE - 4 * avctx->channels) * 8 / (4 * avctx->channels) + 1; /* each 16 bits sample gives one nibble */
 144                                                              /* and we have 4 bytes per channel overhead */
 145         avctx->block_align = BLKSIZE;
 146         /* seems frame_size isn't taken into account... have to buffer the samples :-( */
 147         break;
 148     case CODEC_ID_ADPCM_MS:
 149         avctx->frame_size = (BLKSIZE - 7 * avctx->channels) * 2 / avctx->channels + 2; /* each 16 bits sample gives one nibble */
 150                                                              /* and we have 7 bytes per channel overhead */
 151         avctx->block_align = BLKSIZE;
 152         break;
 153     default:
 154         return -1;
 155         break;
 156     }
 157
 158     avctx->coded_frame= avcodec_alloc_frame();
 159     avctx->coded_frame->key_frame= 1;
 160
 161     return 0;
 162 }
 163
 164 static int adpcm_encode_close(AVCodecContext *avctx)
 165 {
 166     av_freep(&avctx->coded_frame);
 167
 168     return 0;
 169 }
 170
 171
 172 static inline unsigned char adpcm_ima_compress_sample(ADPCMChannelStatus *c, short sample)
 173 {
 174     int step_index;
 175     unsigned char nibble;
 176
 177     int sign = 0; /* sign bit of the nibble (MSB) */
 178     int delta, predicted_delta;
 179
 180     delta = sample - c->prev_sample;
 181
 182     if (delta < 0) {
 183         sign = 1;
 184         delta = -delta;
 185     }
 186
 187     step_index = c->step_index;
 188
 189     /* nibble = 4 * delta / step_table[step_index]; */
 190     nibble = (delta << 2) / step_table[step_index];
 191
 192     if (nibble > 7)
 193         nibble = 7;
 194
 195     step_index += index_table[nibble];
 196     if (step_index < 0)
 197         step_index = 0;
 198     if (step_index > 88)
 199         step_index = 88;
 200
 201     /* what the decoder will find */
 202     predicted_delta = ((step_table[step_index] * nibble) / 4) + (step_table[step_index] / 8);
 203
 204     if (sign)
 205         c->prev_sample -= predicted_delta;
 206     else
 207         c->prev_sample += predicted_delta;
 208
 209     CLAMP_TO_SHORT(c->prev_sample);
 210
 211
 212     nibble += sign << 3; /* sign * 8 */
 213
 214     /* save back */
 215     c->step_index = step_index;
 216
 217     return nibble;
 218 }
 219
 220 static inline unsigned char adpcm_ms_compress_sample(ADPCMChannelStatus *c, short sample)
 221 {
 222     int predictor, nibble, bias;
 223
 224     predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
 225
 226     nibble= sample - predictor;
 227     if(nibble>=0) bias= c->idelta/2;
 228     else          bias=-c->idelta/2;
 229
 230     nibble= (nibble + bias) / c->idelta;
 231     nibble= clip(nibble, -8, 7)&0x0F;
 232
 233     predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
 234     CLAMP_TO_SHORT(predictor);
 235
 236     c->sample2 = c->sample1;
 237     c->sample1 = predictor;
 238
 239     c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;
 240     if (c->idelta < 16) c->idelta = 16;
 241
 242     return nibble;
 243 }
 244
 245 static int adpcm_encode_frame(AVCodecContext *avctx,
 246                             unsigned char *frame, int buf_size, void *data)
 247 {
 248     int n, i, st;
 249     short *samples;
 250     unsigned char *dst;
 251     ADPCMContext *c = avctx->priv_data;
 252
 253     dst = frame;
 254     samples = (short *)data;
 255     st= avctx->channels == 2;
 256 /*    n = (BLKSIZE - 4 * avctx->channels) / (2 * 8 * avctx->channels); */
 257
 258     switch(avctx->codec->id) {
 259     case CODEC_ID_ADPCM_IMA_QT: /* XXX: can't test until we get .mov writer */
 260         break;
 261     case CODEC_ID_ADPCM_IMA_WAV:
 262         n = avctx->frame_size / 8;
 263             c->status[0].prev_sample = (signed short)samples[0]; /* XXX */
 264 /*            c->status[0].step_index = 0; *//* XXX: not sure how to init the state machine */
 265             *dst++ = (c->status[0].prev_sample) & 0xFF; /* little endian */
 266             *dst++ = (c->status[0].prev_sample >> 8) & 0xFF;
 267             *dst++ = (unsigned char)c->status[0].step_index;
 268             *dst++ = 0; /* unknown */
 269             samples++;
 270             if (avctx->channels == 2) {
 271                 c->status[1].prev_sample = (signed short)samples[1];
 272 /*                c->status[1].step_index = 0; */
 273                 *dst++ = (c->status[1].prev_sample) & 0xFF;
 274                 *dst++ = (c->status[1].prev_sample >> 8) & 0xFF;
 275                 *dst++ = (unsigned char)c->status[1].step_index;
 276                 *dst++ = 0;
 277                 samples++;
 278             }
 279
 280             /* stereo: 4 bytes (8 samples) for left, 4 bytes for right, 4 bytes left, ... */
 281             for (; n>0; n--) {
 282                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[0]) & 0x0F;
 283                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels]) << 4) & 0xF0;
 284                 dst++;
 285                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 2]) & 0x0F;
 286                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 3]) << 4) & 0xF0;
 287                 dst++;
 288                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 4]) & 0x0F;
 289                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 5]) << 4) & 0xF0;
 290                 dst++;
 291                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 6]) & 0x0F;
 292                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 7]) << 4) & 0xF0;
 293                 dst++;
 294                 /* right channel */
 295                 if (avctx->channels == 2) {
 296                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[1]);
 297                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[3]) << 4;
 298                     dst++;
 299                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[5]);
 300                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[7]) << 4;
 301                     dst++;
 302                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[9]);
 303                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[11]) << 4;
 304                     dst++;
 305                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[13]);
 306                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[15]) << 4;
 307                     dst++;
 308                 }
 309                 samples += 8 * avctx->channels;
 310             }
 311         break;
 312     case CODEC_ID_ADPCM_MS:
 313         for(i=0; i<avctx->channels; i++){
 314             int predictor=0;
 315
 316             *dst++ = predictor;
 317             c->status[i].coeff1 = AdaptCoeff1[predictor];
 318             c->status[i].coeff2 = AdaptCoeff2[predictor];
 319         }
 320         for(i=0; i<avctx->channels; i++){
 321             if (c->status[i].idelta < 16)
 322                 c->status[i].idelta = 16;
 323
 324             *dst++ = c->status[i].idelta & 0xFF;
 325             *dst++ = c->status[i].idelta >> 8;
 326         }
 327         for(i=0; i<avctx->channels; i++){
 328             c->status[i].sample1= *samples++;
 329
 330             *dst++ = c->status[i].sample1 & 0xFF;
 331             *dst++ = c->status[i].sample1 >> 8;
 332         }
 333         for(i=0; i<avctx->channels; i++){
 334             c->status[i].sample2= *samples++;
 335
 336             *dst++ = c->status[i].sample2 & 0xFF;
 337             *dst++ = c->status[i].sample2 >> 8;
 338         }
 339
 340         for(i=7*avctx->channels; i<avctx->block_align; i++) {
 341             int nibble;
 342             nibble = adpcm_ms_compress_sample(&c->status[ 0], *samples++)<<4;
 343             nibble|= adpcm_ms_compress_sample(&c->status[st], *samples++);
 344             *dst++ = nibble;
 345         }
 346         break;
 347     default:
 348         return -1;
 349     }
 350     return dst - frame;
 351 }
 352 #endif //CONFIG_ENCODERS
 353
 354 static int adpcm_decode_init(AVCodecContext * avctx)
 355 {
 356     ADPCMContext *c = avctx->priv_data;
 357
 358     c->channel = 0;
 359     c->status[0].predictor = c->status[1].predictor = 0;
 360     c->status[0].step_index = c->status[1].step_index = 0;
 361     c->status[0].step = c->status[1].step = 0;
 362
 363     switch(avctx->codec->id) {
 364     default:
 365         break;
 366     }
 367     return 0;
 368 }
 369
 370 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
 371 {
 372     int step_index;
 373     int predictor;
 374     int sign, delta, diff, step;
 375
 376     step = step_table[c->step_index];
 377     step_index = c->step_index + index_table[(unsigned)nibble];
 378     if (step_index < 0) step_index = 0;
 379     else if (step_index > 88) step_index = 88;
 380
 381     sign = nibble & 8;
 382     delta = nibble & 7;
 383     /* perform direct multiplication instead of series of jumps proposed by
 384      * the reference ADPCM implementation since modern CPUs can do the mults
 385      * quickly enough */
 386     diff = ((2 * delta + 1) * step) >> shift;
 387     predictor = c->predictor;
 388     if (sign) predictor -= diff;
 389     else predictor += diff;
 390
 391     CLAMP_TO_SHORT(predictor);
 392     c->predictor = predictor;
 393     c->step_index = step_index;
 394
 395     return (short)predictor;
 396 }
 397
 398 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
 399 {
 400     int predictor;
 401
 402     predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
 403     predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
 404     CLAMP_TO_SHORT(predictor);
 405
 406     c->sample2 = c->sample1;
 407     c->sample1 = predictor;
 408     c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;
 409     if (c->idelta < 16) c->idelta = 16;
 410
 411     return (short)predictor;
 412 }
 413
 414 static void xa_decode(short *out, const unsigned char *in,
 415     ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
 416 {
 417     int i, j;
 418     int shift,filter,f0,f1;
 419     int s_1,s_2;
 420     int d,s,t;
 421
 422     for(i=0;i<4;i++) {
 423
 424         shift  = 12 - (in[4+i*2] & 15);
 425         filter = in[4+i*2] >> 4;
 426         f0 = xa_adpcm_table[filter][0];
 427         f1 = xa_adpcm_table[filter][1];
 428
 429         s_1 = left->sample1;
 430         s_2 = left->sample2;
 431
 432         for(j=0;j<28;j++) {
 433             d = in[16+i+j*4];
 434
 435             t = (signed char)(d<<4)>>4;
 436             s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
 437             CLAMP_TO_SHORT(s);
 438             *out = s;
 439             out += inc;
 440             s_2 = s_1;
 441             s_1 = s;
 442         }
 443
 444         if (inc==2) { /* stereo */
 445             left->sample1 = s_1;
 446             left->sample2 = s_2;
 447             s_1 = right->sample1;
 448             s_2 = right->sample2;
 449             out = out + 1 - 28*2;
 450         }
 451
 452         shift  = 12 - (in[5+i*2] & 15);
 453         filter = in[5+i*2] >> 4;
 454
 455         f0 = xa_adpcm_table[filter][0];
 456         f1 = xa_adpcm_table[filter][1];
 457
 458         for(j=0;j<28;j++) {
 459             d = in[16+i+j*4];
 460
 461             t = (signed char)d >> 4;
 462             s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
 463             CLAMP_TO_SHORT(s);
 464             *out = s;
 465             out += inc;
 466             s_2 = s_1;
 467             s_1 = s;
 468         }
 469
 470         if (inc==2) { /* stereo */
 471             right->sample1 = s_1;
 472             right->sample2 = s_2;
 473             out -= 1;
 474         } else {
 475             left->sample1 = s_1;
 476             left->sample2 = s_2;
 477         }
 478     }
 479 }
 480
 481
 482 /* DK3 ADPCM support macro */
 483 #define DK3_GET_NEXT_NIBBLE() \
 484     if (decode_top_nibble_next) \
 485     { \
 486         nibble = (last_byte >> 4) & 0x0F; \
 487         decode_top_nibble_next = 0; \
 488     } \
 489     else \
 490     { \
 491         last_byte = *src++; \
 492         if (src >= buf + buf_size) break; \
 493         nibble = last_byte & 0x0F; \
 494         decode_top_nibble_next = 1; \
 495     }
 496
 497 static int adpcm_decode_frame(AVCodecContext *avctx,
 498                             void *data, int *data_size,
 499                             uint8_t *buf, int buf_size)
 500 {
 501     ADPCMContext *c = avctx->priv_data;
 502     ADPCMChannelStatus *cs;
 503     int n, m, channel, i;
 504     int block_predictor[2];
 505     short *samples;
 506     uint8_t *src;
 507     int st; /* stereo */
 508
 509     /* DK3 ADPCM accounting variables */
 510     unsigned char last_byte = 0;
 511     unsigned char nibble;
 512     int decode_top_nibble_next = 0;
 513     int diff_channel;
 514
 515     /* EA ADPCM state variables */
 516     uint32_t samples_in_chunk;
 517     int32_t previous_left_sample, previous_right_sample;
 518     int32_t current_left_sample, current_right_sample;
 519     int32_t next_left_sample, next_right_sample;
 520     int32_t coeff1l, coeff2l, coeff1r, coeff2r;
 521     uint8_t shift_left, shift_right;
 522     int count1, count2;
 523
 524     if (!buf_size)
 525         return 0;
 526
 527     samples = data;
 528     src = buf;
 529
 530     st = avctx->channels == 2;
 531
 532     switch(avctx->codec->id) {
 533     case CODEC_ID_ADPCM_IMA_QT:
 534         n = (buf_size - 2);/* >> 2*avctx->channels;*/
 535         channel = c->channel;
 536         cs = &(c->status[channel]);
 537         /* (pppppp) (piiiiiii) */
 538
 539         /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
 540         cs->predictor = (*src++) << 8;
 541         cs->predictor |= (*src & 0x80);
 542         cs->predictor &= 0xFF80;
 543
 544         /* sign extension */
 545         if(cs->predictor & 0x8000)
 546             cs->predictor -= 0x10000;
 547
 548         CLAMP_TO_SHORT(cs->predictor);
 549
 550         cs->step_index = (*src++) & 0x7F;
 551
 552         if (cs->step_index > 88) av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
 553         if (cs->step_index > 88) cs->step_index = 88;
 554
 555         cs->step = step_table[cs->step_index];
 556
 557         if (st && channel)
 558             samples++;
 559
 560         for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
 561             *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F, 3);
 562             samples += avctx->channels;
 563             *samples = adpcm_ima_expand_nibble(cs, (src[0] >> 4) & 0x0F, 3);
 564             samples += avctx->channels;
 565             src ++;
 566         }
 567
 568         if(st) { /* handle stereo interlacing */
 569             c->channel = (channel + 1) % 2; /* we get one packet for left, then one for right data */
 570             if(channel == 1) { /* wait for the other packet before outputing anything */
 571                 return src - buf;
 572             }
 573         }
 574         break;
 575     case CODEC_ID_ADPCM_IMA_WAV:
 576         if (avctx->block_align != 0 && buf_size > avctx->block_align)
 577             buf_size = avctx->block_align;
 578
 579         for(i=0; i<avctx->channels; i++){
 580             cs = &(c->status[i]);
 581             cs->predictor = *src++;
 582             cs->predictor |= (*src++) << 8;
 583             if(cs->predictor & 0x8000)
 584                 cs->predictor -= 0x10000;
 585             CLAMP_TO_SHORT(cs->predictor);
 586
 587         // XXX: is this correct ??: *samples++ = cs->predictor;
 588
 589             cs->step_index = *src++;
 590             if (cs->step_index < 0) cs->step_index = 0;
 591             if (cs->step_index > 88) cs->step_index = 88;
 592             if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null !!\n"); /* unused */
 593         }
 594
 595         for(m=4; src < (buf + buf_size);) {
 596             *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] & 0x0F, 3);
 597             if (st)
 598                 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[4] & 0x0F, 3);
 599             *samples++ = adpcm_ima_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F, 3);
 600             if (st) {
 601                 *samples++ = adpcm_ima_expand_nibble(&c->status[1], (src[4] >> 4) & 0x0F, 3);
 602                 if (!--m) {
 603                     m=4;
 604                     src+=4;
 605                 }
 606             }
 607             src++;
 608         }
 609         break;
 610     case CODEC_ID_ADPCM_4XM:
 611         cs = &(c->status[0]);
 612         c->status[0].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;
 613         if(st){
 614             c->status[1].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;
 615         }
 616         c->status[0].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
 617         if(st){
 618             c->status[1].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
 619         }
 620         if (cs->step_index < 0) cs->step_index = 0;
 621         if (cs->step_index > 88) cs->step_index = 88;
 622
 623         m= (buf_size - (src - buf))>>st;
 624         for(i=0; i<m; i++) {
 625             *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);
 626             if (st)
 627                 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] & 0x0F, 4);
 628             *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] >> 4, 4);
 629             if (st)
 630                 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);
 631         }
 632
 633         src += m<<st;
 634
 635         break;
 636     case CODEC_ID_ADPCM_MS:
 637         if (avctx->block_align != 0 && buf_size > avctx->block_align)
 638             buf_size = avctx->block_align;
 639         n = buf_size - 7 * avctx->channels;
 640         if (n < 0)
 641             return -1;
 642         block_predictor[0] = clip(*src++, 0, 7);
 643         block_predictor[1] = 0;
 644         if (st)
 645             block_predictor[1] = clip(*src++, 0, 7);
 646         c->status[0].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 647         src+=2;
 648         if (st){
 649             c->status[1].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 650             src+=2;
 651         }
 652         c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];
 653         c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];
 654         c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];
 655         c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];
 656
 657         c->status[0].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 658         src+=2;
 659         if (st) c->status[1].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 660         if (st) src+=2;
 661         c->status[0].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 662         src+=2;
 663         if (st) c->status[1].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 664         if (st) src+=2;
 665
 666         *samples++ = c->status[0].sample1;
 667         if (st) *samples++ = c->status[1].sample1;
 668         *samples++ = c->status[0].sample2;
 669         if (st) *samples++ = c->status[1].sample2;
 670         for(;n>0;n--) {
 671             *samples++ = adpcm_ms_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
 672             *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
 673             src ++;
 674         }
 675         break;
 676     case CODEC_ID_ADPCM_IMA_DK4:
 677         if (avctx->block_align != 0 && buf_size > avctx->block_align)
 678             buf_size = avctx->block_align;
 679
 680         c->status[0].predictor = (int16_t)(src[0] | (src[1] << 8));
 681         c->status[0].step_index = src[2];
 682         src += 4;
 683         *samples++ = c->status[0].predictor;
 684         if (st) {
 685             c->status[1].predictor = (int16_t)(src[0] | (src[1] << 8));
 686             c->status[1].step_index = src[2];
 687             src += 4;
 688             *samples++ = c->status[1].predictor;
 689         }
 690         while (src < buf + buf_size) {
 691
 692             /* take care of the top nibble (always left or mono channel) */
 693             *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 694                 (src[0] >> 4) & 0x0F, 3);
 695
 696             /* take care of the bottom nibble, which is right sample for
 697              * stereo, or another mono sample */
 698             if (st)
 699                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
 700                     src[0] & 0x0F, 3);
 701             else
 702                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 703                     src[0] & 0x0F, 3);
 704
 705             src++;
 706         }
 707         break;
 708     case CODEC_ID_ADPCM_IMA_DK3:
 709         if (avctx->block_align != 0 && buf_size > avctx->block_align)
 710             buf_size = avctx->block_align;
 711
 712         c->status[0].predictor = (int16_t)(src[10] | (src[11] << 8));
 713         c->status[1].predictor = (int16_t)(src[12] | (src[13] << 8));
 714         c->status[0].step_index = src[14];
 715         c->status[1].step_index = src[15];
 716         /* sign extend the predictors */
 717         src += 16;
 718         diff_channel = c->status[1].predictor;
 719
 720         /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
 721          * the buffer is consumed */
 722         while (1) {
 723
 724             /* for this algorithm, c->status[0] is the sum channel and
 725              * c->status[1] is the diff channel */
 726
 727             /* process the first predictor of the sum channel */
 728             DK3_GET_NEXT_NIBBLE();
 729             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
 730
 731             /* process the diff channel predictor */
 732             DK3_GET_NEXT_NIBBLE();
 733             adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
 734
 735             /* process the first pair of stereo PCM samples */
 736             diff_channel = (diff_channel + c->status[1].predictor) / 2;
 737             *samples++ = c->status[0].predictor + c->status[1].predictor;
 738             *samples++ = c->status[0].predictor - c->status[1].predictor;
 739
 740             /* process the second predictor of the sum channel */
 741             DK3_GET_NEXT_NIBBLE();
 742             adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
 743
 744             /* process the second pair of stereo PCM samples */
 745             diff_channel = (diff_channel + c->status[1].predictor) / 2;
 746             *samples++ = c->status[0].predictor + c->status[1].predictor;
 747             *samples++ = c->status[0].predictor - c->status[1].predictor;
 748         }
 749         break;
 750     case CODEC_ID_ADPCM_IMA_WS:
 751         /* no per-block initialization; just start decoding the data */
 752         while (src < buf + buf_size) {
 753
 754             if (st) {
 755                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 756                     (src[0] >> 4) & 0x0F, 3);
 757                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
 758                     src[0] & 0x0F, 3);
 759             } else {
 760                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 761                     (src[0] >> 4) & 0x0F, 3);
 762                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 763                     src[0] & 0x0F, 3);
 764             }
 765
 766             src++;
 767         }
 768         break;
 769     case CODEC_ID_ADPCM_XA:
 770         c->status[0].sample1 = c->status[0].sample2 =
 771         c->status[1].sample1 = c->status[1].sample2 = 0;
 772         while (buf_size >= 128) {
 773             xa_decode(samples, src, &c->status[0], &c->status[1],
 774                 avctx->channels);
 775             src += 128;
 776             samples += 28 * 8;
 777             buf_size -= 128;
 778         }
 779         break;
 780     case CODEC_ID_ADPCM_EA:
 781         samples_in_chunk = LE_32(src);
 782         if (samples_in_chunk >= ((buf_size - 12) * 2)) {
 783             src += buf_size;
 784             break;
 785         }
 786         src += 4;
 787         current_left_sample = (int16_t)LE_16(src);
 788         src += 2;
 789         previous_left_sample = (int16_t)LE_16(src);
 790         src += 2;
 791         current_right_sample = (int16_t)LE_16(src);
 792         src += 2;
 793         previous_right_sample = (int16_t)LE_16(src);
 794         src += 2;
 795
 796         for (count1 = 0; count1 < samples_in_chunk/28;count1++) {
 797             coeff1l = ea_adpcm_table[(*src >> 4) & 0x0F];
 798             coeff2l = ea_adpcm_table[((*src >> 4) & 0x0F) + 4];
 799             coeff1r = ea_adpcm_table[*src & 0x0F];
 800             coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
 801             src++;
 802
 803             shift_left = ((*src >> 4) & 0x0F) + 8;
 804             shift_right = (*src & 0x0F) + 8;
 805             src++;
 806
 807             for (count2 = 0; count2 < 28; count2++) {
 808                 next_left_sample = (((*src & 0xF0) << 24) >> shift_left);
 809                 next_right_sample = (((*src & 0x0F) << 28) >> shift_right);
 810                 src++;
 811
 812                 next_left_sample = (next_left_sample +
 813                     (current_left_sample * coeff1l) +
 814                     (previous_left_sample * coeff2l) + 0x80) >> 8;
 815                 next_right_sample = (next_right_sample +
 816                     (current_right_sample * coeff1r) +
 817                     (previous_right_sample * coeff2r) + 0x80) >> 8;
 818                 CLAMP_TO_SHORT(next_left_sample);
 819                 CLAMP_TO_SHORT(next_right_sample);
 820
 821                 previous_left_sample = current_left_sample;
 822                 current_left_sample = next_left_sample;
 823                 previous_right_sample = current_right_sample;
 824                 current_right_sample = next_right_sample;
 825                 *samples++ = (unsigned short)current_left_sample;
 826                 *samples++ = (unsigned short)current_right_sample;
 827             }
 828         }
 829         break;
 830     case CODEC_ID_ADPCM_IMA_SMJPEG:
 831         c->status[0].predictor = *src;
 832         src += 2;
 833         c->status[0].step_index = *src++;
 834         src++;  /* skip another byte before getting to the meat */
 835         while (src < buf + buf_size) {
 836             *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 837                 *src & 0x0F, 3);
 838             *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 839                 (*src >> 4) & 0x0F, 3);
 840             src++;
 841         }
 842         break;
 843     default:
 844         return -1;
 845     }
 846     *data_size = (uint8_t *)samples - (uint8_t *)data;
 847     return src - buf;
 848 }
 849
 850
 851
 852 #ifdef CONFIG_ENCODERS
 853 #define ADPCM_ENCODER(id,name)                  \
 854 AVCodec name ## _encoder = {                    \
 855     #name,                                      \
 856     CODEC_TYPE_AUDIO,                           \
 857     id,                                         \
 858     sizeof(ADPCMContext),                       \
 859     adpcm_encode_init,                          \
 860     adpcm_encode_frame,                         \
 861     adpcm_encode_close,                         \
 862     NULL,                                       \
 863 };
 864 #else
 865 #define ADPCM_ENCODER(id,name)
 866 #endif
 867
 868 #ifdef CONFIG_DECODERS
 869 #define ADPCM_DECODER(id,name)                  \
 870 AVCodec name ## _decoder = {                    \
 871     #name,                                      \
 872     CODEC_TYPE_AUDIO,                           \
 873     id,                                         \
 874     sizeof(ADPCMContext),                       \
 875     adpcm_decode_init,                          \
 876     NULL,                                       \
 877     NULL,                                       \
 878     adpcm_decode_frame,                         \
 879 };
 880 #else
 881 #define ADPCM_DECODER(id,name)
 882 #endif
 883
 884 #define ADPCM_CODEC(id, name)                   \
 885 ADPCM_ENCODER(id,name) ADPCM_DECODER(id,name)
 886
 887 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
 888 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
 889 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
 890 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
 891 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws);
 892 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg);
 893 ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
 894 ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
 895 ADPCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa);
 896 ADPCM_CODEC(CODEC_ID_ADPCM_ADX, adpcm_adx);
 897 ADPCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);
 898
 899 #undef ADPCM_CODEC