libavcodec/wavpack.c

   1 /*
   2  * WavPack lossless audio decoder
   3  * Copyright (c) 2006 Konstantin Shishkov
   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 #define ALT_BITSTREAM_READER_LE
  22 #include "avcodec.h"
  23 #include "bitstream.h"
  24 #include "unary.h"
  25
  26 /**
  27  * @file wavpack.c
  28  * WavPack lossless audio decoder
  29  */
  30
  31 #define WV_JOINT_STEREO 0x00000010
  32 #define WV_FALSE_STEREO 0x40000000
  33
  34 enum WP_ID_Flags{
  35     WP_IDF_MASK   = 0x1F,
  36     WP_IDF_IGNORE = 0x20,
  37     WP_IDF_ODD    = 0x40,
  38     WP_IDF_LONG   = 0x80
  39 };
  40
  41 enum WP_ID{
  42     WP_ID_DUMMY = 0,
  43     WP_ID_ENCINFO,
  44     WP_ID_DECTERMS,
  45     WP_ID_DECWEIGHTS,
  46     WP_ID_DECSAMPLES,
  47     WP_ID_ENTROPY,
  48     WP_ID_HYBRID,
  49     WP_ID_SHAPING,
  50     WP_ID_FLOATINFO,
  51     WP_ID_INT32INFO,
  52     WP_ID_DATA,
  53     WP_ID_CORR,
  54     WP_ID_FLT,
  55     WP_ID_CHANINFO
  56 };
  57
  58 #define MAX_TERMS 16
  59
  60 typedef struct Decorr {
  61     int delta;
  62     int value;
  63     int weightA;
  64     int weightB;
  65     int samplesA[8];
  66     int samplesB[8];
  67 } Decorr;
  68
  69 typedef struct WavpackContext {
  70     AVCodecContext *avctx;
  71     int stereo, stereo_in;
  72     int joint;
  73     uint32_t CRC;
  74     GetBitContext gb;
  75     int data_size; // in bits
  76     int samples;
  77     int median[6];
  78     int terms;
  79     Decorr decorr[MAX_TERMS];
  80     int zero, one, zeroes;
  81     int and, or, shift;
  82 } WavpackContext;
  83
  84 // exponent table copied from WavPack source
  85 static const uint8_t wp_exp2_table [256] = {
  86     0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,
  87     0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,
  88     0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,
  89     0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
  90     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,
  91     0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,
  92     0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
  93     0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
  94     0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
  95     0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,
  96     0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
  97     0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,
  98     0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
  99     0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,
 100     0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,
 101     0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff
 102 };
 103
 104 static av_always_inline int wp_exp2(int16_t val)
 105 {
 106     int res, neg = 0;
 107
 108     if(val < 0){
 109         val = -val;
 110         neg = 1;
 111     }
 112
 113     res = wp_exp2_table[val & 0xFF] | 0x100;
 114     val >>= 8;
 115     res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
 116     return neg ? -res : res;
 117 }
 118
 119 // macros for manipulating median values
 120 #define GET_MED(n) ((median[n] >> 4) + 1)
 121 #define DEC_MED(n) median[n] -= ((median[n] + (128>>n) - 2) / (128>>n)) * 2
 122 #define INC_MED(n) median[n] += ((median[n] + (128>>n)) / (128>>n)) * 5
 123
 124 // macros for applying weight
 125 #define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
 126         if(samples && in){ \
 127             if((samples ^ in) < 0){ \
 128                 weight -= delta; \
 129                 if(weight < -1024) weight = -1024; \
 130             }else{ \
 131                 weight += delta; \
 132                 if(weight > 1024) weight = 1024; \
 133             } \
 134         }
 135
 136
 137 static av_always_inline int get_tail(GetBitContext *gb, int k)
 138 {
 139     int p, e, res;
 140
 141     if(k<1)return 0;
 142     p = av_log2(k);
 143     e = (1 << (p + 1)) - k - 1;
 144     res = p ? get_bits(gb, p) : 0;
 145     if(res >= e){
 146         res = (res<<1) - e + get_bits1(gb);
 147     }
 148     return res;
 149 }
 150
 151 static int wv_get_value(WavpackContext *ctx, GetBitContext *gb, int *median, int *last)
 152 {
 153     int t, t2;
 154     int sign, base, add, ret;
 155
 156     *last = 0;
 157
 158     if((ctx->median[0] < 2U) && (ctx->median[3] < 2U) && !ctx->zero && !ctx->one){
 159         if(ctx->zeroes){
 160             ctx->zeroes--;
 161             if(ctx->zeroes)
 162                 return 0;
 163         }else{
 164             t = get_unary_0_33(gb);
 165             if(t >= 2) t = get_bits(gb, t - 1) | (1 << (t-1));
 166             ctx->zeroes = t;
 167             if(ctx->zeroes){
 168                 memset(ctx->median, 0, sizeof(ctx->median));
 169                 return 0;
 170             }
 171         }
 172     }
 173
 174     if(get_bits_count(gb) >= ctx->data_size){
 175         *last = 1;
 176         return 0;
 177     }
 178
 179     if(ctx->zero){
 180         t = 0;
 181         ctx->zero = 0;
 182     }else{
 183         t = get_unary_0_33(gb);
 184         if(get_bits_count(gb) >= ctx->data_size){
 185             *last = 1;
 186             return 0;
 187         }
 188         if(t == 16) {
 189             t2 = get_unary_0_33(gb);
 190             if(t2 < 2) t += t2;
 191             else t += get_bits(gb, t2 - 1) | (1 << (t2 - 1));
 192         }
 193
 194         if(ctx->one){
 195             ctx->one = t&1;
 196             t = (t>>1) + 1;
 197         }else{
 198             ctx->one = t&1;
 199             t >>= 1;
 200         }
 201         ctx->zero = !ctx->one;
 202     }
 203
 204     if(!t){
 205         base = 0;
 206         add = GET_MED(0) - 1;
 207         DEC_MED(0);
 208     }else if(t == 1){
 209         base = GET_MED(0);
 210         add = GET_MED(1) - 1;
 211         INC_MED(0);
 212         DEC_MED(1);
 213     }else if(t == 2){
 214         base = GET_MED(0) + GET_MED(1);
 215         add = GET_MED(2) - 1;
 216         INC_MED(0);
 217         INC_MED(1);
 218         DEC_MED(2);
 219     }else{
 220         base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2);
 221         add = GET_MED(2) - 1;
 222         INC_MED(0);
 223         INC_MED(1);
 224         INC_MED(2);
 225     }
 226     ret = base + get_tail(gb, add);
 227     sign = get_bits1(gb);
 228     return sign ? ~ret : ret;
 229 }
 230
 231 static int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, int16_t *dst)
 232 {
 233     int i, j, count = 0;
 234     int last, t;
 235     int A, B, L, L2, R, R2, bit;
 236     int pos = 0;
 237     uint32_t crc = 0xFFFFFFFF;
 238
 239     s->one = s->zero = s->zeroes = 0;
 240     do{
 241         L = wv_get_value(s, gb, s->median, &last);
 242         if(last) break;
 243         R = wv_get_value(s, gb, s->median + 3, &last);
 244         if(last) break;
 245         for(i = 0; i < s->terms; i++){
 246             t = s->decorr[i].value;
 247             j = 0;
 248             if(t > 0){
 249                 if(t > 8){
 250                     if(t & 1){
 251                         A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
 252                         B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
 253                     }else{
 254                         A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
 255                         B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
 256                     }
 257                     s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
 258                     s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
 259                     j = 0;
 260                 }else{
 261                     A = s->decorr[i].samplesA[pos];
 262                     B = s->decorr[i].samplesB[pos];
 263                     j = (pos + t) & 7;
 264                 }
 265                 L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
 266                 R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
 267                 if(A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
 268                 if(B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
 269                 s->decorr[i].samplesA[j] = L = L2;
 270                 s->decorr[i].samplesB[j] = R = R2;
 271             }else if(t == -1){
 272                 L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);
 273                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
 274                 L = L2;
 275                 R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
 276                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
 277                 R = R2;
 278                 s->decorr[i].samplesA[0] = R;
 279             }else{
 280                 R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
 281                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
 282                 R = R2;
 283
 284                 if(t == -3){
 285                     R2 = s->decorr[i].samplesA[0];
 286                     s->decorr[i].samplesA[0] = R;
 287                 }
 288
 289                 L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
 290                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
 291                 L = L2;
 292                 s->decorr[i].samplesB[0] = L;
 293             }
 294         }
 295         pos = (pos + 1) & 7;
 296         if(s->joint)
 297             L += (R -= (L >> 1));
 298         crc = (crc * 3 + L) * 3 + R;
 299         bit = (L & s->and) | s->or;
 300         *dst++ = ((L + bit) << s->shift) - bit;
 301         bit = (R & s->and) | s->or;
 302         *dst++ = ((R + bit) << s->shift) - bit;
 303         count++;
 304     }while(!last && count < s->samples);
 305
 306     if(crc != s->CRC){
 307         av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
 308         return -1;
 309     }
 310     return count * 2;
 311 }
 312
 313 static int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, int16_t *dst)
 314 {
 315     int i, j, count = 0;
 316     int last, t;
 317     int A, S, T, bit;
 318     int pos = 0;
 319     uint32_t crc = 0xFFFFFFFF;
 320
 321     s->one = s->zero = s->zeroes = 0;
 322     do{
 323         T = wv_get_value(s, gb, s->median, &last);
 324         S = 0;
 325         if(last) break;
 326         for(i = 0; i < s->terms; i++){
 327             t = s->decorr[i].value;
 328             if(t > 8){
 329                 if(t & 1)
 330                     A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
 331                 else
 332                     A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
 333                 s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
 334                 j = 0;
 335             }else{
 336                 A = s->decorr[i].samplesA[pos];
 337                 j = (pos + t) & 7;
 338             }
 339             S = T + ((s->decorr[i].weightA * A + 512) >> 10);
 340             if(A && T) s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
 341             s->decorr[i].samplesA[j] = T = S;
 342         }
 343         pos = (pos + 1) & 7;
 344         crc = crc * 3 + S;
 345         bit = (S & s->and) | s->or;
 346         *dst++ = ((S + bit) << s->shift) - bit;
 347         count++;
 348     }while(!last && count < s->samples);
 349
 350     if(crc != s->CRC){
 351         av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
 352         return -1;
 353     }
 354     return count;
 355 }
 356
 357 static av_cold int wavpack_decode_init(AVCodecContext *avctx)
 358 {
 359     WavpackContext *s = avctx->priv_data;
 360
 361     s->avctx = avctx;
 362     s->stereo = (avctx->channels == 2);
 363
 364     return 0;
 365 }
 366
 367 static int wavpack_decode_frame(AVCodecContext *avctx,
 368                             void *data, int *data_size,
 369                             const uint8_t *buf, int buf_size)
 370 {
 371     WavpackContext *s = avctx->priv_data;
 372     int16_t *samples = data;
 373     int samplecount;
 374     int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0;
 375     const uint8_t* buf_end = buf + buf_size;
 376     int i, j, id, size, ssize, weights, t;
 377
 378     if (buf_size == 0){
 379         *data_size = 0;
 380         return 0;
 381     }
 382
 383     memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
 384     memset(s->median, 0, sizeof(s->median));
 385     s->and = s->or = s->shift = 0;
 386
 387     s->samples = AV_RL32(buf); buf += 4;
 388     if(!s->samples){
 389         *data_size = 0;
 390         return buf_size;
 391     }
 392     /* should not happen but who knows */
 393     if(s->samples * 2 * avctx->channels > *data_size){
 394         av_log(avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc!\n");
 395         return -1;
 396     }
 397     s->stereo_in = (AV_RL32(buf) & WV_FALSE_STEREO) ? 0 : s->stereo;
 398     s->joint = AV_RL32(buf) & WV_JOINT_STEREO; buf += 4;
 399     s->CRC = AV_RL32(buf); buf += 4;
 400     // parse metadata blocks
 401     while(buf < buf_end){
 402         id = *buf++;
 403         size = *buf++;
 404         if(id & WP_IDF_LONG) {
 405             size |= (*buf++) << 8;
 406             size |= (*buf++) << 16;
 407         }
 408         size <<= 1; // size is specified in words
 409         ssize = size;
 410         if(id & WP_IDF_ODD) size--;
 411         if(size < 0){
 412             av_log(avctx, AV_LOG_ERROR, "Got incorrect block %02X with size %i\n", id, size);
 413             break;
 414         }
 415         if(buf + ssize > buf_end){
 416             av_log(avctx, AV_LOG_ERROR, "Block size %i is out of bounds\n", size);
 417             break;
 418         }
 419         if(id & WP_IDF_IGNORE){
 420             buf += ssize;
 421             continue;
 422         }
 423         switch(id & WP_IDF_MASK){
 424         case WP_ID_DECTERMS:
 425             s->terms = size;
 426             if(s->terms > MAX_TERMS){
 427                 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
 428                 buf += ssize;
 429                 continue;
 430             }
 431             for(i = 0; i < s->terms; i++) {
 432                 s->decorr[s->terms - i - 1].value = (*buf & 0x1F) - 5;
 433                 s->decorr[s->terms - i - 1].delta = *buf >> 5;
 434                 buf++;
 435             }
 436             got_terms = 1;
 437             break;
 438         case WP_ID_DECWEIGHTS:
 439             if(!got_terms){
 440                 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
 441                 continue;
 442             }
 443             weights = size >> s->stereo_in;
 444             if(weights > MAX_TERMS || weights > s->terms){
 445                 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
 446                 buf += ssize;
 447                 continue;
 448             }
 449             for(i = 0; i < weights; i++) {
 450                 t = (int8_t)(*buf++);
 451                 s->decorr[s->terms - i - 1].weightA = t << 3;
 452                 if(s->decorr[s->terms - i - 1].weightA > 0)
 453                     s->decorr[s->terms - i - 1].weightA += (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
 454                 if(s->stereo_in){
 455                     t = (int8_t)(*buf++);
 456                     s->decorr[s->terms - i - 1].weightB = t << 3;
 457                     if(s->decorr[s->terms - i - 1].weightB > 0)
 458                         s->decorr[s->terms - i - 1].weightB += (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
 459                 }
 460             }
 461             got_weights = 1;
 462             break;
 463         case WP_ID_DECSAMPLES:
 464             if(!got_terms){
 465                 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
 466                 continue;
 467             }
 468             t = 0;
 469             for(i = s->terms - 1; (i >= 0) && (t < size); i--) {
 470                 if(s->decorr[i].value > 8){
 471                     s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;
 472                     s->decorr[i].samplesA[1] = wp_exp2(AV_RL16(buf)); buf += 2;
 473                     if(s->stereo_in){
 474                         s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;
 475                         s->decorr[i].samplesB[1] = wp_exp2(AV_RL16(buf)); buf += 2;
 476                         t += 4;
 477                     }
 478                     t += 4;
 479                 }else if(s->decorr[i].value < 0){
 480                     s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;
 481                     s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;
 482                     t += 4;
 483                 }else{
 484                     for(j = 0; j < s->decorr[i].value; j++){
 485                         s->decorr[i].samplesA[j] = wp_exp2(AV_RL16(buf)); buf += 2;
 486                         if(s->stereo_in){
 487                             s->decorr[i].samplesB[j] = wp_exp2(AV_RL16(buf)); buf += 2;
 488                         }
 489                     }
 490                     t += s->decorr[i].value * 2 * (s->stereo_in + 1);
 491                 }
 492             }
 493             got_samples = 1;
 494             break;
 495         case WP_ID_ENTROPY:
 496             if(size != 6 * (s->stereo_in + 1)){
 497                 av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, got %i", 6 * (s->stereo_in + 1), size);
 498                 buf += ssize;
 499                 continue;
 500             }
 501             for(i = 0; i < 3 * (s->stereo_in + 1); i++){
 502                 s->median[i] = wp_exp2(AV_RL16(buf));
 503                 buf += 2;
 504             }
 505             got_entropy = 1;
 506             break;
 507         case WP_ID_INT32INFO:
 508             if(size != 4 || *buf){
 509                 av_log(avctx, AV_LOG_ERROR, "Invalid INT32INFO, size = %i, sent_bits = %i\n", size, *buf);
 510                 buf += ssize;
 511                 continue;
 512             }
 513             if(buf[1])
 514                 s->shift = buf[1];
 515             else if(buf[2]){
 516                 s->and = s->or = 1;
 517                 s->shift = buf[2];
 518             }else if(buf[3]){
 519                 s->and = 1;
 520                 s->shift = buf[3];
 521             }
 522             buf += 4;
 523             break;
 524         case WP_ID_DATA:
 525             init_get_bits(&s->gb, buf, size * 8);
 526             s->data_size = size * 8;
 527             buf += size;
 528             got_bs = 1;
 529             break;
 530         default:
 531             buf += size;
 532         }
 533         if(id & WP_IDF_ODD) buf++;
 534     }
 535     if(!got_terms){
 536         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
 537         return -1;
 538     }
 539     if(!got_weights){
 540         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
 541         return -1;
 542     }
 543     if(!got_samples){
 544         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
 545         return -1;
 546     }
 547     if(!got_entropy){
 548         av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
 549         return -1;
 550     }
 551     if(!got_bs){
 552         av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
 553         return -1;
 554     }
 555
 556     if(s->stereo_in)
 557         samplecount = wv_unpack_stereo(s, &s->gb, samples);
 558     else{
 559         samplecount = wv_unpack_mono(s, &s->gb, samples);
 560         if(s->stereo){
 561             int16_t *dst = samples + samplecount * 2;
 562             int16_t *src = samples + samplecount;
 563             int cnt = samplecount;
 564             while(cnt--){
 565                 *--dst = *--src;
 566                 *--dst = *src;
 567             }
 568             samplecount *= 2;
 569         }
 570     }
 571     *data_size = samplecount * 2;
 572
 573     return buf_size;
 574 }
 575
 576 AVCodec wavpack_decoder = {
 577     "wavpack",
 578     CODEC_TYPE_AUDIO,
 579     CODEC_ID_WAVPACK,
 580     sizeof(WavpackContext),
 581     wavpack_decode_init,
 582     NULL,
 583     NULL,
 584     wavpack_decode_frame,
 585     .long_name = "WavPack",
 586 };