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  *
  29  * Features and limitations:
  30  *
  31  * Reference documents:
  32  * http://www.pcisys.net/~melanson/codecs/simpleaudio.html
  33  * http://www.geocities.com/SiliconValley/8682/aud3.txt
  34  * http://openquicktime.sourceforge.net/plugins.htm
  35  * XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
  36  * http://www.cs.ucla.edu/~leec/mediabench/applications.html
  37  * SoX source code http://home.sprynet.com/~cbagwell/sox.html
  38  *
  39  * CD-ROM XA:
  40  * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html
  41  * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html
  42  * readstr http://www.geocities.co.jp/Playtown/2004/
  43  */
  44
  45 #define BLKSIZE 1024
  46
  47 #define CLAMP_TO_SHORT(value) \
  48 if (value > 32767) \
  49     value = 32767; \
  50 else if (value < -32768) \
  51     value = -32768; \
  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 const static int xa_adpcm_table[5][2] = {
  93    {   0,   0 },
  94    {  60,   0 },
  95    { 115, -52 },
  96    {  98, -55 },
  97    { 122, -60 }
  98 };
  99
 100 /* end of tables */
 101
 102 typedef struct ADPCMChannelStatus {
 103     int predictor;
 104     short int step_index;
 105     int step;
 106     /* for encoding */
 107     int prev_sample;
 108
 109     /* MS version */
 110     short sample1;
 111     short sample2;
 112     int coeff1;
 113     int coeff2;
 114     int idelta;
 115 } ADPCMChannelStatus;
 116
 117 typedef struct ADPCMContext {
 118     int channel; /* for stereo MOVs, decode left, then decode right, then tell it's decoded */
 119     ADPCMChannelStatus status[2];
 120     short sample_buffer[32]; /* hold left samples while waiting for right samples */
 121 } ADPCMContext;
 122
 123 /* XXX: implement encoding */
 124
 125 #ifdef CONFIG_ENCODERS
 126 static int adpcm_encode_init(AVCodecContext *avctx)
 127 {
 128     if (avctx->channels > 2)
 129         return -1; /* only stereo or mono =) */
 130     switch(avctx->codec->id) {
 131     case CODEC_ID_ADPCM_IMA_QT:
 132         fprintf(stderr, "ADPCM: codec admcp_ima_qt unsupported for encoding !\n");
 133         avctx->frame_size = 64; /* XXX: can multiple of avctx->channels * 64 (left and right blocks are interleaved) */
 134         return -1;
 135         break;
 136     case CODEC_ID_ADPCM_IMA_WAV:
 137         avctx->frame_size = (BLKSIZE - 4 * avctx->channels) * 8 / (4 * avctx->channels) + 1; /* each 16 bits sample gives one nibble */
 138                                                              /* and we have 4 bytes per channel overhead */
 139         avctx->block_align = BLKSIZE;
 140         /* seems frame_size isn't taken into account... have to buffer the samples :-( */
 141         break;
 142     case CODEC_ID_ADPCM_MS:
 143         fprintf(stderr, "ADPCM: codec admcp_ms unsupported for encoding !\n");
 144         return -1;
 145         break;
 146     default:
 147         return -1;
 148         break;
 149     }
 150
 151     avctx->coded_frame= avcodec_alloc_frame();
 152     avctx->coded_frame->key_frame= 1;
 153
 154     return 0;
 155 }
 156
 157 static int adpcm_encode_close(AVCodecContext *avctx)
 158 {
 159     av_freep(&avctx->coded_frame);
 160
 161     return 0;
 162 }
 163
 164
 165 static inline unsigned char adpcm_ima_compress_sample(ADPCMChannelStatus *c, short sample)
 166 {
 167     int step_index;
 168     unsigned char nibble;
 169
 170     int sign = 0; /* sign bit of the nibble (MSB) */
 171     int delta, predicted_delta;
 172
 173     delta = sample - c->prev_sample;
 174
 175     if (delta < 0) {
 176         sign = 1;
 177         delta = -delta;
 178     }
 179
 180     step_index = c->step_index;
 181
 182     /* nibble = 4 * delta / step_table[step_index]; */
 183     nibble = (delta << 2) / step_table[step_index];
 184
 185     if (nibble > 7)
 186         nibble = 7;
 187
 188     step_index += index_table[nibble];
 189     if (step_index < 0)
 190         step_index = 0;
 191     if (step_index > 88)
 192         step_index = 88;
 193
 194     /* what the decoder will find */
 195     predicted_delta = ((step_table[step_index] * nibble) / 4) + (step_table[step_index] / 8);
 196
 197     if (sign)
 198         c->prev_sample -= predicted_delta;
 199     else
 200         c->prev_sample += predicted_delta;
 201
 202     CLAMP_TO_SHORT(c->prev_sample);
 203
 204
 205     nibble += sign << 3; /* sign * 8 */
 206
 207     /* save back */
 208     c->step_index = step_index;
 209
 210     return nibble;
 211 }
 212
 213 static int adpcm_encode_frame(AVCodecContext *avctx,
 214                             unsigned char *frame, int buf_size, void *data)
 215 {
 216     int n;
 217     short *samples;
 218     unsigned char *dst;
 219     ADPCMContext *c = avctx->priv_data;
 220
 221     dst = frame;
 222     samples = (short *)data;
 223 /*    n = (BLKSIZE - 4 * avctx->channels) / (2 * 8 * avctx->channels); */
 224
 225     switch(avctx->codec->id) {
 226     case CODEC_ID_ADPCM_IMA_QT: /* XXX: can't test until we get .mov writer */
 227         break;
 228     case CODEC_ID_ADPCM_IMA_WAV:
 229         n = avctx->frame_size / 8;
 230             c->status[0].prev_sample = (signed short)samples[0]; /* XXX */
 231 /*            c->status[0].step_index = 0; *//* XXX: not sure how to init the state machine */
 232             *dst++ = (c->status[0].prev_sample) & 0xFF; /* little endian */
 233             *dst++ = (c->status[0].prev_sample >> 8) & 0xFF;
 234             *dst++ = (unsigned char)c->status[0].step_index;
 235             *dst++ = 0; /* unknown */
 236             samples++;
 237             if (avctx->channels == 2) {
 238                 c->status[1].prev_sample = (signed short)samples[0];
 239 /*                c->status[1].step_index = 0; */
 240                 *dst++ = (c->status[1].prev_sample) & 0xFF;
 241                 *dst++ = (c->status[1].prev_sample >> 8) & 0xFF;
 242                 *dst++ = (unsigned char)c->status[1].step_index;
 243                 *dst++ = 0;
 244                 samples++;
 245             }
 246
 247             /* stereo: 4 bytes (8 samples) for left, 4 bytes for right, 4 bytes left, ... */
 248             for (; n>0; n--) {
 249                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[0]) & 0x0F;
 250                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels]) << 4) & 0xF0;
 251                 dst++;
 252                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 2]) & 0x0F;
 253                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 3]) << 4) & 0xF0;
 254                 dst++;
 255                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 4]) & 0x0F;
 256                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 5]) << 4) & 0xF0;
 257                 dst++;
 258                 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 6]) & 0x0F;
 259                 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 7]) << 4) & 0xF0;
 260                 dst++;
 261                 /* right channel */
 262                 if (avctx->channels == 2) {
 263                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[1]);
 264                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[3]) << 4;
 265                     dst++;
 266                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[5]);
 267                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[7]) << 4;
 268                     dst++;
 269                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[9]);
 270                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[11]) << 4;
 271                     dst++;
 272                     *dst = adpcm_ima_compress_sample(&c->status[1], samples[13]);
 273                     *dst |= adpcm_ima_compress_sample(&c->status[1], samples[15]) << 4;
 274                     dst++;
 275                 }
 276                 samples += 8 * avctx->channels;
 277             }
 278         break;
 279     default:
 280         return -1;
 281     }
 282     return dst - frame;
 283 }
 284 #endif //CONFIG_ENCODERS
 285
 286 static int adpcm_decode_init(AVCodecContext * avctx)
 287 {
 288     ADPCMContext *c = avctx->priv_data;
 289
 290     c->channel = 0;
 291     c->status[0].predictor = c->status[1].predictor = 0;
 292     c->status[0].step_index = c->status[1].step_index = 0;
 293     c->status[0].step = c->status[1].step = 0;
 294
 295     switch(avctx->codec->id) {
 296     default:
 297         break;
 298     }
 299     return 0;
 300 }
 301
 302 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble)
 303 {
 304     int step_index;
 305     int predictor;
 306     int sign, delta, diff, step;
 307
 308     step = step_table[c->step_index];
 309     step_index = c->step_index + index_table[(unsigned)nibble];
 310     if (step_index < 0) step_index = 0;
 311     else if (step_index > 88) step_index = 88;
 312
 313     sign = nibble & 8;
 314     delta = nibble & 7;
 315     /* perform direct multiplication instead of series of jumps proposed by
 316      * the reference ADPCM implementation since modern CPUs can do the mults
 317      * quickly enough */
 318     diff = ((2 * delta + 1) * step) >> 3;
 319     predictor = c->predictor;
 320     if (sign) predictor -= diff;
 321     else predictor += diff;
 322
 323     CLAMP_TO_SHORT(predictor);
 324     c->predictor = predictor;
 325     c->step_index = step_index;
 326
 327     return (short)predictor;
 328 }
 329
 330 static inline short adpcm_4xa_expand_nibble(ADPCMChannelStatus *c, char nibble)
 331 {
 332     int step_index;
 333     int predictor;
 334     int sign, delta, diff, step;
 335
 336     step = step_table[c->step_index];
 337     step_index = c->step_index + index_table[(unsigned)nibble];
 338     if (step_index < 0) step_index = 0;
 339     else if (step_index > 88) step_index = 88;
 340
 341     sign = nibble & 8;
 342     delta = nibble & 7;
 343
 344     diff = (delta*step + (step>>1))>>3; // difference to code above
 345
 346     predictor = c->predictor;
 347     if (sign) predictor -= diff;
 348     else predictor += diff;
 349
 350     CLAMP_TO_SHORT(predictor);
 351     c->predictor = predictor;
 352     c->step_index = step_index;
 353
 354     return (short)predictor;
 355 }
 356
 357 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
 358 {
 359     int predictor;
 360
 361     predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
 362     predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
 363     CLAMP_TO_SHORT(predictor);
 364
 365     c->sample2 = c->sample1;
 366     c->sample1 = predictor;
 367     c->idelta = (AdaptationTable[(int)nibble] * c->idelta) / 256;
 368     if (c->idelta < 16) c->idelta = 16;
 369
 370     return (short)predictor;
 371 }
 372
 373 static void xa_decode(short *out, const unsigned char *in,
 374     ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
 375 {
 376     int i, j;
 377     int shift,filter,f0,f1;
 378     int s_1,s_2;
 379     int d,s,t;
 380
 381     for(i=0;i<4;i++) {
 382
 383         shift  = 12 - (in[4+i*2] & 15);
 384         filter = in[4+i*2] >> 4;
 385         f0 = xa_adpcm_table[filter][0];
 386         f1 = xa_adpcm_table[filter][1];
 387
 388         s_1 = left->sample1;
 389         s_2 = left->sample2;
 390
 391         for(j=0;j<28;j++) {
 392             d = in[16+i+j*4];
 393
 394             t = (signed char)(d<<4)>>4;
 395             s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
 396             CLAMP_TO_SHORT(s);
 397             *out = s;
 398             out += inc;
 399             s_2 = s_1;
 400             s_1 = s;
 401         }
 402
 403         if (inc==2) { /* stereo */
 404             left->sample1 = s_1;
 405             left->sample2 = s_2;
 406             s_1 = right->sample1;
 407             s_2 = right->sample2;
 408             out = out + 1 - 28*2;
 409         }
 410
 411         shift  = 12 - (in[5+i*2] & 15);
 412         filter = in[5+i*2] >> 4;
 413
 414         f0 = xa_adpcm_table[filter][0];
 415         f1 = xa_adpcm_table[filter][1];
 416
 417         for(j=0;j<28;j++) {
 418             d = in[16+i+j*4];
 419
 420             t = (signed char)d >> 4;
 421             s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
 422             CLAMP_TO_SHORT(s);
 423             *out = s;
 424             out += inc;
 425             s_2 = s_1;
 426             s_1 = s;
 427         }
 428
 429         if (inc==2) { /* stereo */
 430             right->sample1 = s_1;
 431             right->sample2 = s_2;
 432             out -= 1;
 433         } else {
 434             left->sample1 = s_1;
 435             left->sample2 = s_2;
 436         }
 437     }
 438 }
 439
 440
 441 /* DK3 ADPCM support macro */
 442 #define DK3_GET_NEXT_NIBBLE() \
 443     if (decode_top_nibble_next) \
 444     { \
 445         nibble = (last_byte >> 4) & 0x0F; \
 446         decode_top_nibble_next = 0; \
 447     } \
 448     else \
 449     { \
 450         last_byte = *src++; \
 451         if (src >= buf + buf_size) break; \
 452         nibble = last_byte & 0x0F; \
 453         decode_top_nibble_next = 1; \
 454     }
 455
 456 static int adpcm_decode_frame(AVCodecContext *avctx,
 457                             void *data, int *data_size,
 458                             uint8_t *buf, int buf_size)
 459 {
 460     ADPCMContext *c = avctx->priv_data;
 461     ADPCMChannelStatus *cs;
 462     int n, m, channel, i;
 463     int block_predictor[2];
 464     short *samples;
 465     uint8_t *src;
 466     int st; /* stereo */
 467
 468     /* DK3 ADPCM accounting variables */
 469     unsigned char last_byte = 0;
 470     unsigned char nibble;
 471     int decode_top_nibble_next = 0;
 472     int diff_channel;
 473
 474     samples = data;
 475     src = buf;
 476
 477     st = avctx->channels == 2;
 478
 479     switch(avctx->codec->id) {
 480     case CODEC_ID_ADPCM_IMA_QT:
 481         n = (buf_size - 2);/* >> 2*avctx->channels;*/
 482         channel = c->channel;
 483         cs = &(c->status[channel]);
 484         /* (pppppp) (piiiiiii) */
 485
 486         /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
 487         cs->predictor = (*src++) << 8;
 488         cs->predictor |= (*src & 0x80);
 489         cs->predictor &= 0xFF80;
 490
 491         /* sign extension */
 492         if(cs->predictor & 0x8000)
 493             cs->predictor -= 0x10000;
 494
 495         CLAMP_TO_SHORT(cs->predictor);
 496
 497         cs->step_index = (*src++) & 0x7F;
 498
 499         if (cs->step_index > 88) fprintf(stderr, "ERROR: step_index = %i\n", cs->step_index);
 500         if (cs->step_index > 88) cs->step_index = 88;
 501
 502         cs->step = step_table[cs->step_index];
 503
 504         if (st && channel)
 505             samples++;
 506
 507         *samples++ = cs->predictor;
 508         samples += st;
 509
 510         for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
 511             *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F);
 512             samples += avctx->channels;
 513             *samples = adpcm_ima_expand_nibble(cs, (src[0] >> 4) & 0x0F);
 514             samples += avctx->channels;
 515             src ++;
 516         }
 517
 518         if(st) { /* handle stereo interlacing */
 519             c->channel = (channel + 1) % 2; /* we get one packet for left, then one for right data */
 520             if(channel == 0) { /* wait for the other packet before outputing anything */
 521                 *data_size = 0;
 522                 return src - buf;
 523             }
 524         }
 525         break;
 526     case CODEC_ID_ADPCM_IMA_WAV:
 527         if (buf_size > BLKSIZE) {
 528             if (avctx->block_align != 0)
 529                 buf_size = avctx->block_align;
 530             else
 531                 buf_size = BLKSIZE;
 532         }
 533         // XXX: do as per-channel loop
 534         cs = &(c->status[0]);
 535         cs->predictor = (*src++) & 0x0FF;
 536         cs->predictor |= ((*src++) << 8) & 0x0FF00;
 537         if(cs->predictor & 0x8000)
 538             cs->predictor -= 0x10000;
 539         CLAMP_TO_SHORT(cs->predictor);
 540
 541         // XXX: is this correct ??: *samples++ = cs->predictor;
 542
 543         cs->step_index = *src++;
 544         if (cs->step_index < 0) cs->step_index = 0;
 545         if (cs->step_index > 88) cs->step_index = 88;
 546         if (*src++) fprintf(stderr, "unused byte should be null !!\n"); /* unused */
 547
 548         if (st) {
 549             cs = &(c->status[1]);
 550             cs->predictor = (*src++) & 0x0FF;
 551             cs->predictor |= ((*src++) << 8) & 0x0FF00;
 552             if(cs->predictor & 0x8000)
 553                 cs->predictor -= 0x10000;
 554             CLAMP_TO_SHORT(cs->predictor);
 555
 556             // XXX: is this correct ??: *samples++ = cs->predictor;
 557
 558             cs->step_index = *src++;
 559             if (cs->step_index < 0) cs->step_index = 0;
 560             if (cs->step_index > 88) cs->step_index = 88;
 561             src++; /* if != 0  -> out-of-sync */
 562         }
 563
 564         for(m=4; src < (buf + buf_size);) {
 565             *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] & 0x0F);
 566             if (st)
 567                 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[4] & 0x0F);
 568             *samples++ = adpcm_ima_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
 569             if (st) {
 570                 *samples++ = adpcm_ima_expand_nibble(&c->status[1], (src[4] >> 4) & 0x0F);
 571                 if (!--m) {
 572                     m=4;
 573                     src+=4;
 574                 }
 575             }
 576             src++;
 577         }
 578         break;
 579     case CODEC_ID_ADPCM_4XM:
 580         cs = &(c->status[0]);
 581         c->status[0].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;
 582         if(st){
 583             c->status[1].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;
 584         }
 585         c->status[0].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
 586         if(st){
 587             c->status[1].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
 588         }
 589 //            if (cs->step_index < 0) cs->step_index = 0;
 590 //            if (cs->step_index > 88) cs->step_index = 88;
 591
 592         m= (buf_size - (src - buf))>>st;
 593 //printf("%d %d %d %d\n", st, m, c->status[0].predictor, c->status[0].step_index);
 594         //FIXME / XXX decode chanels individual & interleave samples
 595         for(i=0; i<m; i++) {
 596             *samples++ = adpcm_4xa_expand_nibble(&c->status[0], src[i] & 0x0F);
 597             if (st)
 598                 *samples++ = adpcm_4xa_expand_nibble(&c->status[1], src[i+m] & 0x0F);
 599             *samples++ = adpcm_4xa_expand_nibble(&c->status[0], src[i] >> 4);
 600             if (st)
 601                 *samples++ = adpcm_4xa_expand_nibble(&c->status[1], src[i+m] >> 4);
 602         }
 603
 604         src += m<<st;
 605
 606         break;
 607     case CODEC_ID_ADPCM_MS:
 608
 609         if (buf_size > BLKSIZE) {
 610             if (avctx->block_align != 0)
 611                 buf_size = avctx->block_align;
 612             else
 613                 buf_size = BLKSIZE;
 614         }
 615         n = buf_size - 7 * avctx->channels;
 616         if (n < 0)
 617             return -1;
 618         block_predictor[0] = (*src++); /* should be bound */
 619         block_predictor[0] = (block_predictor[0] < 0)?(0):((block_predictor[0] > 7)?(7):(block_predictor[0]));
 620         block_predictor[1] = 0;
 621         if (st)
 622             block_predictor[1] = (*src++);
 623         block_predictor[1] = (block_predictor[1] < 0)?(0):((block_predictor[1] > 7)?(7):(block_predictor[1]));
 624         c->status[0].idelta = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 625         if (c->status[0].idelta & 0x08000)
 626             c->status[0].idelta -= 0x10000;
 627         src+=2;
 628         if (st)
 629             c->status[1].idelta = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 630         if (st && c->status[1].idelta & 0x08000)
 631             c->status[1].idelta |= 0xFFFF0000;
 632         if (st)
 633             src+=2;
 634         c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];
 635         c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];
 636         c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];
 637         c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];
 638
 639         c->status[0].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 640         src+=2;
 641         if (st) c->status[1].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 642         if (st) src+=2;
 643         c->status[0].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 644         src+=2;
 645         if (st) c->status[1].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
 646         if (st) src+=2;
 647
 648         *samples++ = c->status[0].sample1;
 649         if (st) *samples++ = c->status[1].sample1;
 650         *samples++ = c->status[0].sample2;
 651         if (st) *samples++ = c->status[1].sample2;
 652         for(;n>0;n--) {
 653             *samples++ = adpcm_ms_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
 654             *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
 655             src ++;
 656         }
 657         break;
 658     case CODEC_ID_ADPCM_IMA_DK4:
 659         if (buf_size > BLKSIZE) {
 660             if (avctx->block_align != 0)
 661                 buf_size = avctx->block_align;
 662             else
 663                 buf_size = BLKSIZE;
 664         }
 665         c->status[0].predictor = (src[0] | (src[1] << 8));
 666         c->status[0].step_index = src[2];
 667         src += 4;
 668         if(c->status[0].predictor & 0x8000)
 669             c->status[0].predictor -= 0x10000;
 670         *samples++ = c->status[0].predictor;
 671         if (st) {
 672             c->status[1].predictor = (src[0] | (src[1] << 8));
 673             c->status[1].step_index = src[2];
 674             src += 4;
 675             if(c->status[1].predictor & 0x8000)
 676                 c->status[1].predictor -= 0x10000;
 677             *samples++ = c->status[1].predictor;
 678         }
 679         while (src < buf + buf_size) {
 680
 681             /* take care of the top nibble (always left or mono channel) */
 682             *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 683                 (src[0] >> 4) & 0x0F);
 684
 685             /* take care of the bottom nibble, which is right sample for
 686              * stereo, or another mono sample */
 687             if (st)
 688                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
 689                     src[0] & 0x0F);
 690             else
 691                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 692                     src[0] & 0x0F);
 693
 694             src++;
 695         }
 696         break;
 697     case CODEC_ID_ADPCM_IMA_DK3:
 698         if (buf_size > BLKSIZE) {
 699             if (avctx->block_align != 0)
 700                 buf_size = avctx->block_align;
 701             else
 702                 buf_size = BLKSIZE;
 703         }
 704         c->status[0].predictor = (src[10] | (src[11] << 8));
 705         c->status[1].predictor = (src[12] | (src[13] << 8));
 706         c->status[0].step_index = src[14];
 707         c->status[1].step_index = src[15];
 708         /* sign extend the predictors */
 709         if(c->status[0].predictor & 0x8000)
 710             c->status[0].predictor -= 0x10000;
 711         if(c->status[1].predictor & 0x8000)
 712             c->status[1].predictor -= 0x10000;
 713         src += 16;
 714         diff_channel = c->status[1].predictor;
 715
 716         /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
 717          * the buffer is consumed */
 718         while (1) {
 719
 720             /* for this algorithm, c->status[0] is the sum channel and
 721              * c->status[1] is the diff channel */
 722
 723             /* process the first predictor of the sum channel */
 724             DK3_GET_NEXT_NIBBLE();
 725             adpcm_ima_expand_nibble(&c->status[0], nibble);
 726
 727             /* process the diff channel predictor */
 728             DK3_GET_NEXT_NIBBLE();
 729             adpcm_ima_expand_nibble(&c->status[1], nibble);
 730
 731             /* process the first pair of stereo PCM samples */
 732             diff_channel = (diff_channel + c->status[1].predictor) / 2;
 733             *samples++ = c->status[0].predictor + c->status[1].predictor;
 734             *samples++ = c->status[0].predictor - c->status[1].predictor;
 735
 736             /* process the second predictor of the sum channel */
 737             DK3_GET_NEXT_NIBBLE();
 738             adpcm_ima_expand_nibble(&c->status[0], nibble);
 739
 740             /* process the second pair of stereo PCM samples */
 741             diff_channel = (diff_channel + c->status[1].predictor) / 2;
 742             *samples++ = c->status[0].predictor + c->status[1].predictor;
 743             *samples++ = c->status[0].predictor - c->status[1].predictor;
 744         }
 745         break;
 746     case CODEC_ID_ADPCM_IMA_WS:
 747         /* no per-block initialization; just start decoding the data */
 748         while (src < buf + buf_size) {
 749
 750             if (st) {
 751                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 752                     (src[0] >> 4) & 0x0F);
 753                 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
 754                     src[0] & 0x0F);
 755             } else {
 756                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 757                     (src[0] >> 4) & 0x0F);
 758                 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
 759                     src[0] & 0x0F);
 760             }
 761
 762             src++;
 763         }
 764         break;
 765     case CODEC_ID_ADPCM_XA:
 766         c->status[0].sample1 = c->status[0].sample2 =
 767         c->status[1].sample1 = c->status[1].sample2 = 0;
 768         while (buf_size >= 128) {
 769             xa_decode(samples, src, &c->status[0], &c->status[1],
 770                 avctx->channels);
 771             src += 128;
 772             samples += 28 * 8;
 773             buf_size -= 128;
 774         }
 775         break;
 776     default:
 777         *data_size = 0;
 778         return -1;
 779     }
 780     *data_size = (uint8_t *)samples - (uint8_t *)data;
 781     return src - buf;
 782 }
 783
 784
 785
 786 #ifdef CONFIG_ENCODERS
 787 #define ADPCM_ENCODER(id,name)                  \
 788 AVCodec name ## _encoder = {                    \
 789     #name,                                      \
 790     CODEC_TYPE_AUDIO,                           \
 791     id,                                         \
 792     sizeof(ADPCMContext),                       \
 793     adpcm_encode_init,                          \
 794     adpcm_encode_frame,                         \
 795     adpcm_encode_close,                         \
 796     NULL,                                       \
 797 };
 798 #else
 799 #define ADPCM_ENCODER(id,name)
 800 #endif
 801
 802 #ifdef CONFIG_DECODERS
 803 #define ADPCM_DECODER(id,name)                  \
 804 AVCodec name ## _decoder = {                    \
 805     #name,                                      \
 806     CODEC_TYPE_AUDIO,                           \
 807     id,                                         \
 808     sizeof(ADPCMContext),                       \
 809     adpcm_decode_init,                          \
 810     NULL,                                       \
 811     NULL,                                       \
 812     adpcm_decode_frame,                         \
 813 };
 814 #else
 815 #define ADPCM_DECODER(id,name)
 816 #endif
 817
 818 #define ADPCM_CODEC(id, name)                   \
 819 ADPCM_ENCODER(id,name) ADPCM_DECODER(id,name)
 820
 821 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
 822 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
 823 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
 824 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
 825 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws);
 826 ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
 827 ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
 828 ADPCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa);
 829 ADPCM_CODEC(CODEC_ID_ADPCM_ADX, adpcm_adx);
 830
 831 #undef ADPCM_CODEC