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wavpack.c
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1 /*
2  * WavPack lossless audio decoder
3  * Copyright (c) 2006,2011 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 
22 #define BITSTREAM_READER_LE
23 
24 #include "libavutil/channel_layout.h"
25 #include "avcodec.h"
26 #include "get_bits.h"
27 #include "internal.h"
28 #include "thread.h"
29 #include "unary.h"
30 #include "bytestream.h"
31 #include "wavpack.h"
32 
33 /**
34  * @file
35  * WavPack lossless audio decoder
36  */
37 
38 typedef struct SavedContext {
39  int offset;
40  int size;
41  int bits_used;
42  uint32_t crc;
43 } SavedContext;
44 
45 typedef struct WavpackFrameContext {
46  AVCodecContext *avctx;
47  int frame_flags;
48  int stereo, stereo_in;
49  int joint;
50  uint32_t CRC;
51  GetBitContext gb;
52  int got_extra_bits;
53  uint32_t crc_extra_bits;
54  GetBitContext gb_extra_bits;
55  int data_size; // in bits
56  int samples;
57  int terms;
58  Decorr decorr[MAX_TERMS];
59  int zero, one, zeroes;
60  int extra_bits;
61  int and, or, shift;
62  int post_shift;
63  int hybrid, hybrid_bitrate;
64  int hybrid_maxclip, hybrid_minclip;
65  int float_flag;
66  int float_shift;
67  int float_max_exp;
68  WvChannel ch[2];
69  int pos;
70  SavedContext sc, extra_sc;
71 } WavpackFrameContext;
72 
73 #define WV_MAX_FRAME_DECODERS 14
74 
75 typedef struct WavpackContext {
76  AVCodecContext *avctx;
77 
78  WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS];
79  int fdec_num;
80 
81  int block;
82  int samples;
83  int ch_offset;
84 } WavpackContext;
85 
86 #define LEVEL_DECAY(a) (((a) + 0x80) >> 8)
87 
88 static av_always_inline int get_tail(GetBitContext *gb, int k)
89 {
90  int p, e, res;
91 
92  if (k < 1)
93  return 0;
94  p = av_log2(k);
95  e = (1 << (p + 1)) - k - 1;
96  res = p ? get_bits(gb, p) : 0;
97  if (res >= e)
98  res = (res << 1) - e + get_bits1(gb);
99  return res;
100 }
101 
102 static void update_error_limit(WavpackFrameContext *ctx)
103 {
104  int i, br[2], sl[2];
105 
106  for (i = 0; i <= ctx->stereo_in; i++) {
107  ctx->ch[i].bitrate_acc += ctx->ch[i].bitrate_delta;
108  br[i] = ctx->ch[i].bitrate_acc >> 16;
109  sl[i] = LEVEL_DECAY(ctx->ch[i].slow_level);
110  }
111  if (ctx->stereo_in && ctx->hybrid_bitrate) {
112  int balance = (sl[1] - sl[0] + br[1] + 1) >> 1;
113  if (balance > br[0]) {
114  br[1] = br[0] << 1;
115  br[0] = 0;
116  } else if (-balance > br[0]) {
117  br[0] <<= 1;
118  br[1] = 0;
119  } else {
120  br[1] = br[0] + balance;
121  br[0] = br[0] - balance;
122  }
123  }
124  for (i = 0; i <= ctx->stereo_in; i++) {
125  if (ctx->hybrid_bitrate) {
126  if (sl[i] - br[i] > -0x100)
127  ctx->ch[i].error_limit = wp_exp2(sl[i] - br[i] + 0x100);
128  else
129  ctx->ch[i].error_limit = 0;
130  } else {
131  ctx->ch[i].error_limit = wp_exp2(br[i]);
132  }
133  }
134 }
135 
136 static int wv_get_value(WavpackFrameContext *ctx, GetBitContext *gb,
137  int channel, int *last)
138 {
139  int t, t2;
140  int sign, base, add, ret;
141  WvChannel *c = &ctx->ch[channel];
142 
143  *last = 0;
144 
145  if ((ctx->ch[0].median[0] < 2U) && (ctx->ch[1].median[0] < 2U) &&
146  !ctx->zero && !ctx->one) {
147  if (ctx->zeroes) {
148  ctx->zeroes--;
149  if (ctx->zeroes) {
150  c->slow_level -= LEVEL_DECAY(c->slow_level);
151  return 0;
152  }
153  } else {
154  t = get_unary_0_33(gb);
155  if (t >= 2) {
156  if (get_bits_left(gb) < t - 1)
157  goto error;
158  t = get_bits(gb, t - 1) | (1 << (t - 1));
159  } else {
160  if (get_bits_left(gb) < 0)
161  goto error;
162  }
163  ctx->zeroes = t;
164  if (ctx->zeroes) {
165  memset(ctx->ch[0].median, 0, sizeof(ctx->ch[0].median));
166  memset(ctx->ch[1].median, 0, sizeof(ctx->ch[1].median));
167  c->slow_level -= LEVEL_DECAY(c->slow_level);
168  return 0;
169  }
170  }
171  }
172 
173  if (ctx->zero) {
174  t = 0;
175  ctx->zero = 0;
176  } else {
177  t = get_unary_0_33(gb);
178  if (get_bits_left(gb) < 0)
179  goto error;
180  if (t == 16) {
181  t2 = get_unary_0_33(gb);
182  if (t2 < 2) {
183  if (get_bits_left(gb) < 0)
184  goto error;
185  t += t2;
186  } else {
187  if (get_bits_left(gb) < t2 - 1)
188  goto error;
189  t += get_bits(gb, t2 - 1) | (1 << (t2 - 1));
190  }
191  }
192 
193  if (ctx->one) {
194  ctx->one = t & 1;
195  t = (t >> 1) + 1;
196  } else {
197  ctx->one = t & 1;
198  t >>= 1;
199  }
200  ctx->zero = !ctx->one;
201  }
202 
203  if (ctx->hybrid && !channel)
204  update_error_limit(ctx);
205 
206  if (!t) {
207  base = 0;
208  add = GET_MED(0) - 1;
209  DEC_MED(0);
210  } else if (t == 1) {
211  base = GET_MED(0);
212  add = GET_MED(1) - 1;
213  INC_MED(0);
214  DEC_MED(1);
215  } else if (t == 2) {
216  base = GET_MED(0) + GET_MED(1);
217  add = GET_MED(2) - 1;
218  INC_MED(0);
219  INC_MED(1);
220  DEC_MED(2);
221  } else {
222  base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2);
223  add = GET_MED(2) - 1;
224  INC_MED(0);
225  INC_MED(1);
226  INC_MED(2);
227  }
228  if (!c->error_limit) {
229  if (add >= 0x2000000U) {
230  av_log(ctx->avctx, AV_LOG_ERROR, "k %d is too large\n", add);
231  goto error;
232  }
233  ret = base + get_tail(gb, add);
234  if (get_bits_left(gb) <= 0)
235  goto error;
236  } else {
237  int mid = (base * 2 + add + 1) >> 1;
238  while (add > c->error_limit) {
239  if (get_bits_left(gb) <= 0)
240  goto error;
241  if (get_bits1(gb)) {
242  add -= (mid - base);
243  base = mid;
244  } else
245  add = mid - base - 1;
246  mid = (base * 2 + add + 1) >> 1;
247  }
248  ret = mid;
249  }
250  sign = get_bits1(gb);
251  if (ctx->hybrid_bitrate)
252  c->slow_level += wp_log2(ret) - LEVEL_DECAY(c->slow_level);
253  return sign ? ~ret : ret;
254 
255 error:
256  *last = 1;
257  return 0;
258 }
259 
260 static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc,
261  int S)
262 {
263  int bit;
264 
265  if (s->extra_bits) {
266  S <<= s->extra_bits;
267 
268  if (s->got_extra_bits &&
269  get_bits_left(&s->gb_extra_bits) >= s->extra_bits) {
270  S |= get_bits(&s->gb_extra_bits, s->extra_bits);
271  *crc = *crc * 9 + (S & 0xffff) * 3 + ((unsigned)S >> 16);
272  }
273  }
274 
275  bit = (S & s->and) | s->or;
276  bit = ((S + bit) << s->shift) - bit;
277 
278  if (s->hybrid)
279  bit = av_clip(bit, s->hybrid_minclip, s->hybrid_maxclip);
280 
281  return bit << s->post_shift;
282 }
283 
284 static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S)
285 {
286  union {
287  float f;
288  uint32_t u;
289  } value;
290 
291  unsigned int sign;
292  int exp = s->float_max_exp;
293 
294  if (s->got_extra_bits) {
295  const int max_bits = 1 + 23 + 8 + 1;
296  const int left_bits = get_bits_left(&s->gb_extra_bits);
297 
298  if (left_bits + 8 * FF_INPUT_BUFFER_PADDING_SIZE < max_bits)
299  return 0.0;
300  }
301 
302  if (S) {
303  S <<= s->float_shift;
304  sign = S < 0;
305  if (sign)
306  S = -S;
307  if (S >= 0x1000000) {
308  if (s->got_extra_bits && get_bits1(&s->gb_extra_bits))
309  S = get_bits(&s->gb_extra_bits, 23);
310  else
311  S = 0;
312  exp = 255;
313  } else if (exp) {
314  int shift = 23 - av_log2(S);
315  exp = s->float_max_exp;
316  if (exp <= shift)
317  shift = --exp;
318  exp -= shift;
319 
320  if (shift) {
321  S <<= shift;
322  if ((s->float_flag & WV_FLT_SHIFT_ONES) ||
323  (s->got_extra_bits &&
324  (s->float_flag & WV_FLT_SHIFT_SAME) &&
325  get_bits1(&s->gb_extra_bits))) {
326  S |= (1 << shift) - 1;
327  } else if (s->got_extra_bits &&
328  (s->float_flag & WV_FLT_SHIFT_SENT)) {
329  S |= get_bits(&s->gb_extra_bits, shift);
330  }
331  }
332  } else {
333  exp = s->float_max_exp;
334  }
335  S &= 0x7fffff;
336  } else {
337  sign = 0;
338  exp = 0;
339  if (s->got_extra_bits && (s->float_flag & WV_FLT_ZERO_SENT)) {
340  if (get_bits1(&s->gb_extra_bits)) {
341  S = get_bits(&s->gb_extra_bits, 23);
342  if (s->float_max_exp >= 25)
343  exp = get_bits(&s->gb_extra_bits, 8);
344  sign = get_bits1(&s->gb_extra_bits);
345  } else {
346  if (s->float_flag & WV_FLT_ZERO_SIGN)
347  sign = get_bits1(&s->gb_extra_bits);
348  }
349  }
350  }
351 
352  *crc = *crc * 27 + S * 9 + exp * 3 + sign;
353 
354  value.u = (sign << 31) | (exp << 23) | S;
355  return value.f;
356 }
357 
358 static void wv_reset_saved_context(WavpackFrameContext *s)
359 {
360  s->pos = 0;
361  s->sc.crc = s->extra_sc.crc = 0xFFFFFFFF;
362 }
363 
364 static inline int wv_check_crc(WavpackFrameContext *s, uint32_t crc,
365  uint32_t crc_extra_bits)
366 {
367  if (crc != s->CRC) {
368  av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
369  return AVERROR_INVALIDDATA;
370  }
371  if (s->got_extra_bits && crc_extra_bits != s->crc_extra_bits) {
372  av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
373  return AVERROR_INVALIDDATA;
374  }
375 
376  return 0;
377 }
378 
379 static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb,
380  void *dst_l, void *dst_r, const int type)
381 {
382  int i, j, count = 0;
383  int last, t;
384  int A, B, L, L2, R, R2;
385  int pos = s->pos;
386  uint32_t crc = s->sc.crc;
387  uint32_t crc_extra_bits = s->extra_sc.crc;
388  int16_t *dst16_l = dst_l;
389  int16_t *dst16_r = dst_r;
390  int32_t *dst32_l = dst_l;
391  int32_t *dst32_r = dst_r;
392  float *dstfl_l = dst_l;
393  float *dstfl_r = dst_r;
394 
395  s->one = s->zero = s->zeroes = 0;
396  do {
397  L = wv_get_value(s, gb, 0, &last);
398  if (last)
399  break;
400  R = wv_get_value(s, gb, 1, &last);
401  if (last)
402  break;
403  for (i = 0; i < s->terms; i++) {
404  t = s->decorr[i].value;
405  if (t > 0) {
406  if (t > 8) {
407  if (t & 1) {
408  A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
409  B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
410  } else {
411  A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
412  B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
413  }
414  s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
415  s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
416  j = 0;
417  } else {
418  A = s->decorr[i].samplesA[pos];
419  B = s->decorr[i].samplesB[pos];
420  j = (pos + t) & 7;
421  }
422  if (type != AV_SAMPLE_FMT_S16P) {
423  L2 = L + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
424  R2 = R + ((s->decorr[i].weightB * (int64_t)B + 512) >> 10);
425  } else {
426  L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
427  R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
428  }
429  if (A && L)
430  s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
431  if (B && R)
432  s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
433  s->decorr[i].samplesA[j] = L = L2;
434  s->decorr[i].samplesB[j] = R = R2;
435  } else if (t == -1) {
436  if (type != AV_SAMPLE_FMT_S16P)
437  L2 = L + ((s->decorr[i].weightA * (int64_t)s->decorr[i].samplesA[0] + 512) >> 10);
438  else
439  L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);
440  UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
441  L = L2;
442  if (type != AV_SAMPLE_FMT_S16P)
443  R2 = R + ((s->decorr[i].weightB * (int64_t)L2 + 512) >> 10);
444  else
445  R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
446  UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
447  R = R2;
448  s->decorr[i].samplesA[0] = R;
449  } else {
450  if (type != AV_SAMPLE_FMT_S16P)
451  R2 = R + ((s->decorr[i].weightB * (int64_t)s->decorr[i].samplesB[0] + 512) >> 10);
452  else
453  R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
454  UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
455  R = R2;
456 
457  if (t == -3) {
458  R2 = s->decorr[i].samplesA[0];
459  s->decorr[i].samplesA[0] = R;
460  }
461 
462  if (type != AV_SAMPLE_FMT_S16P)
463  L2 = L + ((s->decorr[i].weightA * (int64_t)R2 + 512) >> 10);
464  else
465  L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
466  UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
467  L = L2;
468  s->decorr[i].samplesB[0] = L;
469  }
470  }
471  pos = (pos + 1) & 7;
472  if (s->joint)
473  L += (R -= (L >> 1));
474  crc = (crc * 3 + L) * 3 + R;
475 
476  if (type == AV_SAMPLE_FMT_FLTP) {
477  *dstfl_l++ = wv_get_value_float(s, &crc_extra_bits, L);
478  *dstfl_r++ = wv_get_value_float(s, &crc_extra_bits, R);
479  } else if (type == AV_SAMPLE_FMT_S32P) {
480  *dst32_l++ = wv_get_value_integer(s, &crc_extra_bits, L);
481  *dst32_r++ = wv_get_value_integer(s, &crc_extra_bits, R);
482  } else {
483  *dst16_l++ = wv_get_value_integer(s, &crc_extra_bits, L);
484  *dst16_r++ = wv_get_value_integer(s, &crc_extra_bits, R);
485  }
486  count++;
487  } while (!last && count < s->samples);
488 
489  wv_reset_saved_context(s);
490 
491  if (last && count < s->samples) {
492  int size = av_get_bytes_per_sample(type);
493  memset((uint8_t*)dst_l + count*size, 0, (s->samples-count)*size);
494  memset((uint8_t*)dst_r + count*size, 0, (s->samples-count)*size);
495  }
496 
497  if ((s->avctx->err_recognition & AV_EF_CRCCHECK) &&
498  wv_check_crc(s, crc, crc_extra_bits))
499  return AVERROR_INVALIDDATA;
500 
501  return 0;
502 }
503 
504 static inline int wv_unpack_mono(WavpackFrameContext *s, GetBitContext *gb,
505  void *dst, const int type)
506 {
507  int i, j, count = 0;
508  int last, t;
509  int A, S, T;
510  int pos = s->pos;
511  uint32_t crc = s->sc.crc;
512  uint32_t crc_extra_bits = s->extra_sc.crc;
513  int16_t *dst16 = dst;
514  int32_t *dst32 = dst;
515  float *dstfl = dst;
516 
517  s->one = s->zero = s->zeroes = 0;
518  do {
519  T = wv_get_value(s, gb, 0, &last);
520  S = 0;
521  if (last)
522  break;
523  for (i = 0; i < s->terms; i++) {
524  t = s->decorr[i].value;
525  if (t > 8) {
526  if (t & 1)
527  A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
528  else
529  A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
530  s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
531  j = 0;
532  } else {
533  A = s->decorr[i].samplesA[pos];
534  j = (pos + t) & 7;
535  }
536  if (type != AV_SAMPLE_FMT_S16P)
537  S = T + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
538  else
539  S = T + ((s->decorr[i].weightA * A + 512) >> 10);
540  if (A && T)
541  s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
542  s->decorr[i].samplesA[j] = T = S;
543  }
544  pos = (pos + 1) & 7;
545  crc = crc * 3 + S;
546 
547  if (type == AV_SAMPLE_FMT_FLTP) {
548  *dstfl++ = wv_get_value_float(s, &crc_extra_bits, S);
549  } else if (type == AV_SAMPLE_FMT_S32P) {
550  *dst32++ = wv_get_value_integer(s, &crc_extra_bits, S);
551  } else {
552  *dst16++ = wv_get_value_integer(s, &crc_extra_bits, S);
553  }
554  count++;
555  } while (!last && count < s->samples);
556 
557  wv_reset_saved_context(s);
558 
559  if (last && count < s->samples) {
560  int size = av_get_bytes_per_sample(type);
561  memset((uint8_t*)dst + count*size, 0, (s->samples-count)*size);
562  }
563 
564  if (s->avctx->err_recognition & AV_EF_CRCCHECK) {
565  int ret = wv_check_crc(s, crc, crc_extra_bits);
566  if (ret < 0 && s->avctx->err_recognition & AV_EF_EXPLODE)
567  return ret;
568  }
569 
570  return 0;
571 }
572 
573 static av_cold int wv_alloc_frame_context(WavpackContext *c)
574 {
575  if (c->fdec_num == WV_MAX_FRAME_DECODERS)
576  return -1;
577 
578  c->fdec[c->fdec_num] = av_mallocz(sizeof(**c->fdec));
579  if (!c->fdec[c->fdec_num])
580  return -1;
581  c->fdec_num++;
582  c->fdec[c->fdec_num - 1]->avctx = c->avctx;
583  wv_reset_saved_context(c->fdec[c->fdec_num - 1]);
584 
585  return 0;
586 }
587 
588 static int init_thread_copy(AVCodecContext *avctx)
589 {
590  WavpackContext *s = avctx->priv_data;
591  s->avctx = avctx;
592  return 0;
593 }
594 
595 static av_cold int wavpack_decode_init(AVCodecContext *avctx)
596 {
597  WavpackContext *s = avctx->priv_data;
598 
599  s->avctx = avctx;
600 
601  s->fdec_num = 0;
602 
603  return 0;
604 }
605 
606 static av_cold int wavpack_decode_end(AVCodecContext *avctx)
607 {
608  WavpackContext *s = avctx->priv_data;
609  int i;
610 
611  for (i = 0; i < s->fdec_num; i++)
612  av_freep(&s->fdec[i]);
613  s->fdec_num = 0;
614 
615  return 0;
616 }
617 
618 static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
619  AVFrame *frame, const uint8_t *buf, int buf_size)
620 {
621  WavpackContext *wc = avctx->priv_data;
622  ThreadFrame tframe = { .f = frame };
623  WavpackFrameContext *s;
624  GetByteContext gb;
625  void *samples_l = NULL, *samples_r = NULL;
626  int ret;
627  int got_terms = 0, got_weights = 0, got_samples = 0,
628  got_entropy = 0, got_bs = 0, got_float = 0, got_hybrid = 0;
629  int i, j, id, size, ssize, weights, t;
630  int bpp, chan = 0, chmask = 0, orig_bpp, sample_rate = 0;
631  int multiblock;
632 
633  if (block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0) {
634  av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n");
635  return AVERROR_INVALIDDATA;
636  }
637 
638  s = wc->fdec[block_no];
639  if (!s) {
640  av_log(avctx, AV_LOG_ERROR, "Context for block %d is not present\n",
641  block_no);
642  return AVERROR_INVALIDDATA;
643  }
644 
645  memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
646  memset(s->ch, 0, sizeof(s->ch));
647  s->extra_bits = 0;
648  s->and = s->or = s->shift = 0;
649  s->got_extra_bits = 0;
650 
651  bytestream2_init(&gb, buf, buf_size);
652 
653  s->samples = bytestream2_get_le32(&gb);
654  if (s->samples != wc->samples) {
655  av_log(avctx, AV_LOG_ERROR, "Mismatching number of samples in "
656  "a sequence: %d and %d\n", wc->samples, s->samples);
657  return AVERROR_INVALIDDATA;
658  }
659  s->frame_flags = bytestream2_get_le32(&gb);
660  bpp = av_get_bytes_per_sample(avctx->sample_fmt);
661  orig_bpp = ((s->frame_flags & 0x03) + 1) << 3;
662  multiblock = (s->frame_flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK;
663 
664  s->stereo = !(s->frame_flags & WV_MONO);
665  s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
666  s->joint = s->frame_flags & WV_JOINT_STEREO;
667  s->hybrid = s->frame_flags & WV_HYBRID_MODE;
668  s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE;
669  s->post_shift = bpp * 8 - orig_bpp + ((s->frame_flags >> 13) & 0x1f);
670  s->hybrid_maxclip = ((1LL << (orig_bpp - 1)) - 1);
671  s->hybrid_minclip = ((-1LL << (orig_bpp - 1)));
672  s->CRC = bytestream2_get_le32(&gb);
673 
674  // parse metadata blocks
675  while (bytestream2_get_bytes_left(&gb)) {
676  id = bytestream2_get_byte(&gb);
677  size = bytestream2_get_byte(&gb);
678  if (id & WP_IDF_LONG) {
679  size |= (bytestream2_get_byte(&gb)) << 8;
680  size |= (bytestream2_get_byte(&gb)) << 16;
681  }
682  size <<= 1; // size is specified in words
683  ssize = size;
684  if (id & WP_IDF_ODD)
685  size--;
686  if (size < 0) {
687  av_log(avctx, AV_LOG_ERROR,
688  "Got incorrect block %02X with size %i\n", id, size);
689  break;
690  }
691  if (bytestream2_get_bytes_left(&gb) < ssize) {
692  av_log(avctx, AV_LOG_ERROR,
693  "Block size %i is out of bounds\n", size);
694  break;
695  }
696  switch (id & WP_IDF_MASK) {
697  case WP_ID_DECTERMS:
698  if (size > MAX_TERMS) {
699  av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
700  s->terms = 0;
701  bytestream2_skip(&gb, ssize);
702  continue;
703  }
704  s->terms = size;
705  for (i = 0; i < s->terms; i++) {
706  uint8_t val = bytestream2_get_byte(&gb);
707  s->decorr[s->terms - i - 1].value = (val & 0x1F) - 5;
708  s->decorr[s->terms - i - 1].delta = val >> 5;
709  }
710  got_terms = 1;
711  break;
712  case WP_ID_DECWEIGHTS:
713  if (!got_terms) {
714  av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
715  continue;
716  }
717  weights = size >> s->stereo_in;
718  if (weights > MAX_TERMS || weights > s->terms) {
719  av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
720  bytestream2_skip(&gb, ssize);
721  continue;
722  }
723  for (i = 0; i < weights; i++) {
724  t = (int8_t)bytestream2_get_byte(&gb);
725  s->decorr[s->terms - i - 1].weightA = t << 3;
726  if (s->decorr[s->terms - i - 1].weightA > 0)
727  s->decorr[s->terms - i - 1].weightA +=
728  (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
729  if (s->stereo_in) {
730  t = (int8_t)bytestream2_get_byte(&gb);
731  s->decorr[s->terms - i - 1].weightB = t << 3;
732  if (s->decorr[s->terms - i - 1].weightB > 0)
733  s->decorr[s->terms - i - 1].weightB +=
734  (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
735  }
736  }
737  got_weights = 1;
738  break;
739  case WP_ID_DECSAMPLES:
740  if (!got_terms) {
741  av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
742  continue;
743  }
744  t = 0;
745  for (i = s->terms - 1; (i >= 0) && (t < size); i--) {
746  if (s->decorr[i].value > 8) {
747  s->decorr[i].samplesA[0] =
748  wp_exp2(bytestream2_get_le16(&gb));
749  s->decorr[i].samplesA[1] =
750  wp_exp2(bytestream2_get_le16(&gb));
751 
752  if (s->stereo_in) {
753  s->decorr[i].samplesB[0] =
754  wp_exp2(bytestream2_get_le16(&gb));
755  s->decorr[i].samplesB[1] =
756  wp_exp2(bytestream2_get_le16(&gb));
757  t += 4;
758  }
759  t += 4;
760  } else if (s->decorr[i].value < 0) {
761  s->decorr[i].samplesA[0] =
762  wp_exp2(bytestream2_get_le16(&gb));
763  s->decorr[i].samplesB[0] =
764  wp_exp2(bytestream2_get_le16(&gb));
765  t += 4;
766  } else {
767  for (j = 0; j < s->decorr[i].value; j++) {
768  s->decorr[i].samplesA[j] =
769  wp_exp2(bytestream2_get_le16(&gb));
770  if (s->stereo_in) {
771  s->decorr[i].samplesB[j] =
772  wp_exp2(bytestream2_get_le16(&gb));
773  }
774  }
775  t += s->decorr[i].value * 2 * (s->stereo_in + 1);
776  }
777  }
778  got_samples = 1;
779  break;
780  case WP_ID_ENTROPY:
781  if (size != 6 * (s->stereo_in + 1)) {
782  av_log(avctx, AV_LOG_ERROR,
783  "Entropy vars size should be %i, got %i.\n",
784  6 * (s->stereo_in + 1), size);
785  bytestream2_skip(&gb, ssize);
786  continue;
787  }
788  for (j = 0; j <= s->stereo_in; j++)
789  for (i = 0; i < 3; i++) {
790  s->ch[j].median[i] = wp_exp2(bytestream2_get_le16(&gb));
791  }
792  got_entropy = 1;
793  break;
794  case WP_ID_HYBRID:
795  if (s->hybrid_bitrate) {
796  for (i = 0; i <= s->stereo_in; i++) {
797  s->ch[i].slow_level = wp_exp2(bytestream2_get_le16(&gb));
798  size -= 2;
799  }
800  }
801  for (i = 0; i < (s->stereo_in + 1); i++) {
802  s->ch[i].bitrate_acc = bytestream2_get_le16(&gb) << 16;
803  size -= 2;
804  }
805  if (size > 0) {
806  for (i = 0; i < (s->stereo_in + 1); i++) {
807  s->ch[i].bitrate_delta =
808  wp_exp2((int16_t)bytestream2_get_le16(&gb));
809  }
810  } else {
811  for (i = 0; i < (s->stereo_in + 1); i++)
812  s->ch[i].bitrate_delta = 0;
813  }
814  got_hybrid = 1;
815  break;
816  case WP_ID_INT32INFO: {
817  uint8_t val[4];
818  if (size != 4) {
819  av_log(avctx, AV_LOG_ERROR,
820  "Invalid INT32INFO, size = %i\n",
821  size);
822  bytestream2_skip(&gb, ssize - 4);
823  continue;
824  }
825  bytestream2_get_buffer(&gb, val, 4);
826  if (val[0]) {
827  s->extra_bits = val[0];
828  } else if (val[1]) {
829  s->shift = val[1];
830  } else if (val[2]) {
831  s->and = s->or = 1;
832  s->shift = val[2];
833  } else if (val[3]) {
834  s->and = 1;
835  s->shift = val[3];
836  }
837  /* original WavPack decoder forces 32-bit lossy sound to be treated
838  * as 24-bit one in order to have proper clipping */
839  if (s->hybrid && bpp == 4 && s->post_shift < 8 && s->shift > 8) {
840  s->post_shift += 8;
841  s->shift -= 8;
842  s->hybrid_maxclip >>= 8;
843  s->hybrid_minclip >>= 8;
844  }
845  break;
846  }
847  case WP_ID_FLOATINFO:
848  if (size != 4) {
849  av_log(avctx, AV_LOG_ERROR,
850  "Invalid FLOATINFO, size = %i\n", size);
851  bytestream2_skip(&gb, ssize);
852  continue;
853  }
854  s->float_flag = bytestream2_get_byte(&gb);
855  s->float_shift = bytestream2_get_byte(&gb);
856  s->float_max_exp = bytestream2_get_byte(&gb);
857  got_float = 1;
858  bytestream2_skip(&gb, 1);
859  break;
860  case WP_ID_DATA:
861  s->sc.offset = bytestream2_tell(&gb);
862  s->sc.size = size * 8;
863  if ((ret = init_get_bits8(&s->gb, gb.buffer, size)) < 0)
864  return ret;
865  s->data_size = size * 8;
866  bytestream2_skip(&gb, size);
867  got_bs = 1;
868  break;
869  case WP_ID_EXTRABITS:
870  if (size <= 4) {
871  av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n",
872  size);
873  bytestream2_skip(&gb, size);
874  continue;
875  }
876  s->extra_sc.offset = bytestream2_tell(&gb);
877  s->extra_sc.size = size * 8;
878  if ((ret = init_get_bits8(&s->gb_extra_bits, gb.buffer, size)) < 0)
879  return ret;
880  s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);
881  bytestream2_skip(&gb, size);
882  s->got_extra_bits = 1;
883  break;
884  case WP_ID_CHANINFO:
885  if (size <= 1) {
886  av_log(avctx, AV_LOG_ERROR,
887  "Insufficient channel information\n");
888  return AVERROR_INVALIDDATA;
889  }
890  chan = bytestream2_get_byte(&gb);
891  switch (size - 2) {
892  case 0:
893  chmask = bytestream2_get_byte(&gb);
894  break;
895  case 1:
896  chmask = bytestream2_get_le16(&gb);
897  break;
898  case 2:
899  chmask = bytestream2_get_le24(&gb);
900  break;
901  case 3:
902  chmask = bytestream2_get_le32(&gb);
903  break;
904  case 5:
905  bytestream2_skip(&gb, 1);
906  chan |= (bytestream2_get_byte(&gb) & 0xF) << 8;
907  chmask = bytestream2_get_le16(&gb);
908  break;
909  default:
910  av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n",
911  size);
912  chan = avctx->channels;
913  chmask = avctx->channel_layout;
914  }
915  break;
916  case WP_ID_SAMPLE_RATE:
917  if (size != 3) {
918  av_log(avctx, AV_LOG_ERROR, "Invalid custom sample rate.\n");
919  return AVERROR_INVALIDDATA;
920  }
921  sample_rate = bytestream2_get_le24(&gb);
922  break;
923  default:
924  bytestream2_skip(&gb, size);
925  }
926  if (id & WP_IDF_ODD)
927  bytestream2_skip(&gb, 1);
928  }
929 
930  if (!got_terms) {
931  av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
932  return AVERROR_INVALIDDATA;
933  }
934  if (!got_weights) {
935  av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
936  return AVERROR_INVALIDDATA;
937  }
938  if (!got_samples) {
939  av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
940  return AVERROR_INVALIDDATA;
941  }
942  if (!got_entropy) {
943  av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
944  return AVERROR_INVALIDDATA;
945  }
946  if (s->hybrid && !got_hybrid) {
947  av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");
948  return AVERROR_INVALIDDATA;
949  }
950  if (!got_bs) {
951  av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
952  return AVERROR_INVALIDDATA;
953  }
954  if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLTP) {
955  av_log(avctx, AV_LOG_ERROR, "Float information not found\n");
956  return AVERROR_INVALIDDATA;
957  }
958  if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLTP) {
959  const int size = get_bits_left(&s->gb_extra_bits);
960  const int wanted = s->samples * s->extra_bits << s->stereo_in;
961  if (size < wanted) {
962  av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");
963  s->got_extra_bits = 0;
964  }
965  }
966 
967  if (!wc->ch_offset) {
968  int sr = (s->frame_flags >> 23) & 0xf;
969  if (sr == 0xf) {
970  if (!sample_rate) {
971  av_log(avctx, AV_LOG_ERROR, "Custom sample rate missing.\n");
972  return AVERROR_INVALIDDATA;
973  }
974  avctx->sample_rate = sample_rate;
975  } else
976  avctx->sample_rate = wv_rates[sr];
977 
978  if (multiblock) {
979  if (chan)
980  avctx->channels = chan;
981  if (chmask)
982  avctx->channel_layout = chmask;
983  } else {
984  avctx->channels = s->stereo ? 2 : 1;
985  avctx->channel_layout = s->stereo ? AV_CH_LAYOUT_STEREO :
986  AV_CH_LAYOUT_MONO;
987  }
988 
989  /* get output buffer */
990  frame->nb_samples = s->samples + 1;
991  if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
992  return ret;
993  frame->nb_samples = s->samples;
994  }
995 
996  if (wc->ch_offset + s->stereo >= avctx->channels) {
997  av_log(avctx, AV_LOG_WARNING, "Too many channels coded in a packet.\n");
998  return (avctx->err_recognition & AV_EF_EXPLODE) ? AVERROR_INVALIDDATA : 0;
999  }
1000 
1001  samples_l = frame->extended_data[wc->ch_offset];
1002  if (s->stereo)
1003  samples_r = frame->extended_data[wc->ch_offset + 1];
1004 
1005  wc->ch_offset += 1 + s->stereo;
1006 
1007  if (s->stereo_in) {
1008  ret = wv_unpack_stereo(s, &s->gb, samples_l, samples_r, avctx->sample_fmt);
1009  if (ret < 0)
1010  return ret;
1011  } else {
1012  ret = wv_unpack_mono(s, &s->gb, samples_l, avctx->sample_fmt);
1013  if (ret < 0)
1014  return ret;
1015 
1016  if (s->stereo)
1017  memcpy(samples_r, samples_l, bpp * s->samples);
1018  }
1019 
1020  return 0;
1021 }
1022 
1023 static void wavpack_decode_flush(AVCodecContext *avctx)
1024 {
1025  WavpackContext *s = avctx->priv_data;
1026  int i;
1027 
1028  for (i = 0; i < s->fdec_num; i++)
1029  wv_reset_saved_context(s->fdec[i]);
1030 }
1031 
1032 static int wavpack_decode_frame(AVCodecContext *avctx, void *data,
1033  int *got_frame_ptr, AVPacket *avpkt)
1034 {
1035  WavpackContext *s = avctx->priv_data;
1036  const uint8_t *buf = avpkt->data;
1037  int buf_size = avpkt->size;
1038  AVFrame *frame = data;
1039  int frame_size, ret, frame_flags;
1040 
1041  if (avpkt->size <= WV_HEADER_SIZE)
1042  return AVERROR_INVALIDDATA;
1043 
1044  s->block = 0;
1045  s->ch_offset = 0;
1046 
1047  /* determine number of samples */
1048  s->samples = AV_RL32(buf + 20);
1049  frame_flags = AV_RL32(buf + 24);
1050  if (s->samples <= 0 || s->samples > WV_MAX_SAMPLES) {
1051  av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n",
1052  s->samples);
1053  return AVERROR_INVALIDDATA;
1054  }
1055 
1056  if (frame_flags & 0x80) {
1057  avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1058  } else if ((frame_flags & 0x03) <= 1) {
1059  avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
1060  } else {
1061  avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
1062  avctx->bits_per_raw_sample = ((frame_flags & 0x03) + 1) << 3;
1063  }
1064 
1065  while (buf_size > 0) {
1066  if (buf_size <= WV_HEADER_SIZE)
1067  break;
1068  frame_size = AV_RL32(buf + 4) - 12;
1069  buf += 20;
1070  buf_size -= 20;
1071  if (frame_size <= 0 || frame_size > buf_size) {
1072  av_log(avctx, AV_LOG_ERROR,
1073  "Block %d has invalid size (size %d vs. %d bytes left)\n",
1074  s->block, frame_size, buf_size);
1075  wavpack_decode_flush(avctx);
1076  return AVERROR_INVALIDDATA;
1077  }
1078  if ((ret = wavpack_decode_block(avctx, s->block,
1079  frame, buf, frame_size)) < 0) {
1080  wavpack_decode_flush(avctx);
1081  return ret;
1082  }
1083  s->block++;
1084  buf += frame_size;
1085  buf_size -= frame_size;
1086  }
1087 
1088  if (s->ch_offset != avctx->channels) {
1089  av_log(avctx, AV_LOG_ERROR, "Not enough channels coded in a packet.\n");
1090  return AVERROR_INVALIDDATA;
1091  }
1092 
1093  *got_frame_ptr = 1;
1094 
1095  return avpkt->size;
1096 }
1097 
1098 AVCodec ff_wavpack_decoder = {
1099  .name = "wavpack",
1100  .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
1101  .type = AVMEDIA_TYPE_AUDIO,
1102  .id = AV_CODEC_ID_WAVPACK,
1103  .priv_data_size = sizeof(WavpackContext),
1104  .init = wavpack_decode_init,
1105  .close = wavpack_decode_end,
1106  .decode = wavpack_decode_frame,
1107  .flush = wavpack_decode_flush,
1108  .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
1109  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
1110 };
Generated on Sun Jul 20 2014 23:05:57 for FFmpeg by   doxygen 1.8.2