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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  if ((s->avctx->err_recognition & AV_EF_CRCCHECK) &&
491  wv_check_crc(s, crc, crc_extra_bits))
492  return AVERROR_INVALIDDATA;
493 
494  return 0;
495 }
496 
497 static inline int wv_unpack_mono(WavpackFrameContext *s, GetBitContext *gb,
498  void *dst, const int type)
499 {
500  int i, j, count = 0;
501  int last, t;
502  int A, S, T;
503  int pos = s->pos;
504  uint32_t crc = s->sc.crc;
505  uint32_t crc_extra_bits = s->extra_sc.crc;
506  int16_t *dst16 = dst;
507  int32_t *dst32 = dst;
508  float *dstfl = dst;
509 
510  s->one = s->zero = s->zeroes = 0;
511  do {
512  T = wv_get_value(s, gb, 0, &last);
513  S = 0;
514  if (last)
515  break;
516  for (i = 0; i < s->terms; i++) {
517  t = s->decorr[i].value;
518  if (t > 8) {
519  if (t & 1)
520  A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
521  else
522  A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
523  s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
524  j = 0;
525  } else {
526  A = s->decorr[i].samplesA[pos];
527  j = (pos + t) & 7;
528  }
529  if (type != AV_SAMPLE_FMT_S16P)
530  S = T + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
531  else
532  S = T + ((s->decorr[i].weightA * A + 512) >> 10);
533  if (A && T)
534  s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
535  s->decorr[i].samplesA[j] = T = S;
536  }
537  pos = (pos + 1) & 7;
538  crc = crc * 3 + S;
539 
540  if (type == AV_SAMPLE_FMT_FLTP) {
541  *dstfl++ = wv_get_value_float(s, &crc_extra_bits, S);
542  } else if (type == AV_SAMPLE_FMT_S32P) {
543  *dst32++ = wv_get_value_integer(s, &crc_extra_bits, S);
544  } else {
545  *dst16++ = wv_get_value_integer(s, &crc_extra_bits, S);
546  }
547  count++;
548  } while (!last && count < s->samples);
549 
550  wv_reset_saved_context(s);
551  if ((s->avctx->err_recognition & AV_EF_CRCCHECK) &&
552  wv_check_crc(s, crc, crc_extra_bits))
553  return AVERROR_INVALIDDATA;
554 
555  return 0;
556 }
557 
558 static av_cold int wv_alloc_frame_context(WavpackContext *c)
559 {
560  if (c->fdec_num == WV_MAX_FRAME_DECODERS)
561  return -1;
562 
563  c->fdec[c->fdec_num] = av_mallocz(sizeof(**c->fdec));
564  if (!c->fdec[c->fdec_num])
565  return -1;
566  c->fdec_num++;
567  c->fdec[c->fdec_num - 1]->avctx = c->avctx;
568  wv_reset_saved_context(c->fdec[c->fdec_num - 1]);
569 
570  return 0;
571 }
572 
573 static int init_thread_copy(AVCodecContext *avctx)
574 {
575  WavpackContext *s = avctx->priv_data;
576  s->avctx = avctx;
577  return 0;
578 }
579 
580 static av_cold int wavpack_decode_init(AVCodecContext *avctx)
581 {
582  WavpackContext *s = avctx->priv_data;
583 
584  s->avctx = avctx;
585 
586  s->fdec_num = 0;
587 
588  return 0;
589 }
590 
591 static av_cold int wavpack_decode_end(AVCodecContext *avctx)
592 {
593  WavpackContext *s = avctx->priv_data;
594  int i;
595 
596  for (i = 0; i < s->fdec_num; i++)
597  av_freep(&s->fdec[i]);
598  s->fdec_num = 0;
599 
600  return 0;
601 }
602 
603 static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
604  AVFrame *frame, const uint8_t *buf, int buf_size)
605 {
606  WavpackContext *wc = avctx->priv_data;
607  ThreadFrame tframe = { .f = frame };
608  WavpackFrameContext *s;
609  GetByteContext gb;
610  void *samples_l, *samples_r;
611  int ret;
612  int got_terms = 0, got_weights = 0, got_samples = 0,
613  got_entropy = 0, got_bs = 0, got_float = 0, got_hybrid = 0;
614  int i, j, id, size, ssize, weights, t;
615  int bpp, chan = 0, chmask = 0, orig_bpp, sample_rate = 0;
616  int multiblock;
617 
618  if (block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0) {
619  av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n");
620  return AVERROR_INVALIDDATA;
621  }
622 
623  s = wc->fdec[block_no];
624  if (!s) {
625  av_log(avctx, AV_LOG_ERROR, "Context for block %d is not present\n",
626  block_no);
627  return AVERROR_INVALIDDATA;
628  }
629 
630  memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
631  memset(s->ch, 0, sizeof(s->ch));
632  s->extra_bits = 0;
633  s->and = s->or = s->shift = 0;
634  s->got_extra_bits = 0;
635 
636  bytestream2_init(&gb, buf, buf_size);
637 
638  s->samples = bytestream2_get_le32(&gb);
639  if (s->samples != wc->samples) {
640  av_log(avctx, AV_LOG_ERROR, "Mismatching number of samples in "
641  "a sequence: %d and %d\n", wc->samples, s->samples);
642  return AVERROR_INVALIDDATA;
643  }
644  s->frame_flags = bytestream2_get_le32(&gb);
645  bpp = av_get_bytes_per_sample(avctx->sample_fmt);
646  orig_bpp = ((s->frame_flags & 0x03) + 1) << 3;
647  multiblock = (s->frame_flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK;
648 
649  s->stereo = !(s->frame_flags & WV_MONO);
650  s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
651  s->joint = s->frame_flags & WV_JOINT_STEREO;
652  s->hybrid = s->frame_flags & WV_HYBRID_MODE;
653  s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE;
654  s->post_shift = bpp * 8 - orig_bpp + ((s->frame_flags >> 13) & 0x1f);
655  s->hybrid_maxclip = ((1LL << (orig_bpp - 1)) - 1);
656  s->hybrid_minclip = ((-1LL << (orig_bpp - 1)));
657  s->CRC = bytestream2_get_le32(&gb);
658 
659  // parse metadata blocks
660  while (bytestream2_get_bytes_left(&gb)) {
661  id = bytestream2_get_byte(&gb);
662  size = bytestream2_get_byte(&gb);
663  if (id & WP_IDF_LONG) {
664  size |= (bytestream2_get_byte(&gb)) << 8;
665  size |= (bytestream2_get_byte(&gb)) << 16;
666  }
667  size <<= 1; // size is specified in words
668  ssize = size;
669  if (id & WP_IDF_ODD)
670  size--;
671  if (size < 0) {
672  av_log(avctx, AV_LOG_ERROR,
673  "Got incorrect block %02X with size %i\n", id, size);
674  break;
675  }
676  if (bytestream2_get_bytes_left(&gb) < ssize) {
677  av_log(avctx, AV_LOG_ERROR,
678  "Block size %i is out of bounds\n", size);
679  break;
680  }
681  switch (id & WP_IDF_MASK) {
682  case WP_ID_DECTERMS:
683  if (size > MAX_TERMS) {
684  av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
685  s->terms = 0;
686  bytestream2_skip(&gb, ssize);
687  continue;
688  }
689  s->terms = size;
690  for (i = 0; i < s->terms; i++) {
691  uint8_t val = bytestream2_get_byte(&gb);
692  s->decorr[s->terms - i - 1].value = (val & 0x1F) - 5;
693  s->decorr[s->terms - i - 1].delta = val >> 5;
694  }
695  got_terms = 1;
696  break;
697  case WP_ID_DECWEIGHTS:
698  if (!got_terms) {
699  av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
700  continue;
701  }
702  weights = size >> s->stereo_in;
703  if (weights > MAX_TERMS || weights > s->terms) {
704  av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
705  bytestream2_skip(&gb, ssize);
706  continue;
707  }
708  for (i = 0; i < weights; i++) {
709  t = (int8_t)bytestream2_get_byte(&gb);
710  s->decorr[s->terms - i - 1].weightA = t << 3;
711  if (s->decorr[s->terms - i - 1].weightA > 0)
712  s->decorr[s->terms - i - 1].weightA +=
713  (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
714  if (s->stereo_in) {
715  t = (int8_t)bytestream2_get_byte(&gb);
716  s->decorr[s->terms - i - 1].weightB = t << 3;
717  if (s->decorr[s->terms - i - 1].weightB > 0)
718  s->decorr[s->terms - i - 1].weightB +=
719  (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
720  }
721  }
722  got_weights = 1;
723  break;
724  case WP_ID_DECSAMPLES:
725  if (!got_terms) {
726  av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
727  continue;
728  }
729  t = 0;
730  for (i = s->terms - 1; (i >= 0) && (t < size); i--) {
731  if (s->decorr[i].value > 8) {
732  s->decorr[i].samplesA[0] =
733  wp_exp2(bytestream2_get_le16(&gb));
734  s->decorr[i].samplesA[1] =
735  wp_exp2(bytestream2_get_le16(&gb));
736 
737  if (s->stereo_in) {
738  s->decorr[i].samplesB[0] =
739  wp_exp2(bytestream2_get_le16(&gb));
740  s->decorr[i].samplesB[1] =
741  wp_exp2(bytestream2_get_le16(&gb));
742  t += 4;
743  }
744  t += 4;
745  } else if (s->decorr[i].value < 0) {
746  s->decorr[i].samplesA[0] =
747  wp_exp2(bytestream2_get_le16(&gb));
748  s->decorr[i].samplesB[0] =
749  wp_exp2(bytestream2_get_le16(&gb));
750  t += 4;
751  } else {
752  for (j = 0; j < s->decorr[i].value; j++) {
753  s->decorr[i].samplesA[j] =
754  wp_exp2(bytestream2_get_le16(&gb));
755  if (s->stereo_in) {
756  s->decorr[i].samplesB[j] =
757  wp_exp2(bytestream2_get_le16(&gb));
758  }
759  }
760  t += s->decorr[i].value * 2 * (s->stereo_in + 1);
761  }
762  }
763  got_samples = 1;
764  break;
765  case WP_ID_ENTROPY:
766  if (size != 6 * (s->stereo_in + 1)) {
767  av_log(avctx, AV_LOG_ERROR,
768  "Entropy vars size should be %i, got %i.\n",
769  6 * (s->stereo_in + 1), size);
770  bytestream2_skip(&gb, ssize);
771  continue;
772  }
773  for (j = 0; j <= s->stereo_in; j++)
774  for (i = 0; i < 3; i++) {
775  s->ch[j].median[i] = wp_exp2(bytestream2_get_le16(&gb));
776  }
777  got_entropy = 1;
778  break;
779  case WP_ID_HYBRID:
780  if (s->hybrid_bitrate) {
781  for (i = 0; i <= s->stereo_in; i++) {
782  s->ch[i].slow_level = wp_exp2(bytestream2_get_le16(&gb));
783  size -= 2;
784  }
785  }
786  for (i = 0; i < (s->stereo_in + 1); i++) {
787  s->ch[i].bitrate_acc = bytestream2_get_le16(&gb) << 16;
788  size -= 2;
789  }
790  if (size > 0) {
791  for (i = 0; i < (s->stereo_in + 1); i++) {
792  s->ch[i].bitrate_delta =
793  wp_exp2((int16_t)bytestream2_get_le16(&gb));
794  }
795  } else {
796  for (i = 0; i < (s->stereo_in + 1); i++)
797  s->ch[i].bitrate_delta = 0;
798  }
799  got_hybrid = 1;
800  break;
801  case WP_ID_INT32INFO: {
802  uint8_t val[4];
803  if (size != 4) {
804  av_log(avctx, AV_LOG_ERROR,
805  "Invalid INT32INFO, size = %i\n",
806  size);
807  bytestream2_skip(&gb, ssize - 4);
808  continue;
809  }
810  bytestream2_get_buffer(&gb, val, 4);
811  if (val[0]) {
812  s->extra_bits = val[0];
813  } else if (val[1]) {
814  s->shift = val[1];
815  } else if (val[2]) {
816  s->and = s->or = 1;
817  s->shift = val[2];
818  } else if (val[3]) {
819  s->and = 1;
820  s->shift = val[3];
821  }
822  /* original WavPack decoder forces 32-bit lossy sound to be treated
823  * as 24-bit one in order to have proper clipping */
824  if (s->hybrid && bpp == 4 && s->post_shift < 8 && s->shift > 8) {
825  s->post_shift += 8;
826  s->shift -= 8;
827  s->hybrid_maxclip >>= 8;
828  s->hybrid_minclip >>= 8;
829  }
830  break;
831  }
832  case WP_ID_FLOATINFO:
833  if (size != 4) {
834  av_log(avctx, AV_LOG_ERROR,
835  "Invalid FLOATINFO, size = %i\n", size);
836  bytestream2_skip(&gb, ssize);
837  continue;
838  }
839  s->float_flag = bytestream2_get_byte(&gb);
840  s->float_shift = bytestream2_get_byte(&gb);
841  s->float_max_exp = bytestream2_get_byte(&gb);
842  got_float = 1;
843  bytestream2_skip(&gb, 1);
844  break;
845  case WP_ID_DATA:
846  s->sc.offset = bytestream2_tell(&gb);
847  s->sc.size = size * 8;
848  init_get_bits(&s->gb, gb.buffer, size * 8);
849  s->data_size = size * 8;
850  bytestream2_skip(&gb, size);
851  got_bs = 1;
852  break;
853  case WP_ID_EXTRABITS:
854  if (size <= 4) {
855  av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n",
856  size);
857  bytestream2_skip(&gb, size);
858  continue;
859  }
860  s->extra_sc.offset = bytestream2_tell(&gb);
861  s->extra_sc.size = size * 8;
862  init_get_bits(&s->gb_extra_bits, gb.buffer, size * 8);
863  s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);
864  bytestream2_skip(&gb, size);
865  s->got_extra_bits = 1;
866  break;
867  case WP_ID_CHANINFO:
868  if (size <= 1) {
869  av_log(avctx, AV_LOG_ERROR,
870  "Insufficient channel information\n");
871  return AVERROR_INVALIDDATA;
872  }
873  chan = bytestream2_get_byte(&gb);
874  switch (size - 2) {
875  case 0:
876  chmask = bytestream2_get_byte(&gb);
877  break;
878  case 1:
879  chmask = bytestream2_get_le16(&gb);
880  break;
881  case 2:
882  chmask = bytestream2_get_le24(&gb);
883  break;
884  case 3:
885  chmask = bytestream2_get_le32(&gb);
886  break;
887  case 5:
888  bytestream2_skip(&gb, 1);
889  chan |= (bytestream2_get_byte(&gb) & 0xF) << 8;
890  chmask = bytestream2_get_le16(&gb);
891  break;
892  default:
893  av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n",
894  size);
895  chan = avctx->channels;
896  chmask = avctx->channel_layout;
897  }
898  break;
899  case WP_ID_SAMPLE_RATE:
900  if (size != 3) {
901  av_log(avctx, AV_LOG_ERROR, "Invalid custom sample rate.\n");
902  return AVERROR_INVALIDDATA;
903  }
904  sample_rate = bytestream2_get_le24(&gb);
905  break;
906  default:
907  bytestream2_skip(&gb, size);
908  }
909  if (id & WP_IDF_ODD)
910  bytestream2_skip(&gb, 1);
911  }
912 
913  if (!got_terms) {
914  av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
915  return AVERROR_INVALIDDATA;
916  }
917  if (!got_weights) {
918  av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
919  return AVERROR_INVALIDDATA;
920  }
921  if (!got_samples) {
922  av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
923  return AVERROR_INVALIDDATA;
924  }
925  if (!got_entropy) {
926  av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
927  return AVERROR_INVALIDDATA;
928  }
929  if (s->hybrid && !got_hybrid) {
930  av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");
931  return AVERROR_INVALIDDATA;
932  }
933  if (!got_bs) {
934  av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
935  return AVERROR_INVALIDDATA;
936  }
937  if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLTP) {
938  av_log(avctx, AV_LOG_ERROR, "Float information not found\n");
939  return AVERROR_INVALIDDATA;
940  }
941  if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLTP) {
942  const int size = get_bits_left(&s->gb_extra_bits);
943  const int wanted = s->samples * s->extra_bits << s->stereo_in;
944  if (size < wanted) {
945  av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");
946  s->got_extra_bits = 0;
947  }
948  }
949 
950  if (!wc->ch_offset) {
951  int sr = (s->frame_flags >> 23) & 0xf;
952  if (sr == 0xf) {
953  if (!sample_rate) {
954  av_log(avctx, AV_LOG_ERROR, "Custom sample rate missing.\n");
955  return AVERROR_INVALIDDATA;
956  }
957  avctx->sample_rate = sample_rate;
958  } else
959  avctx->sample_rate = wv_rates[sr];
960 
961  if (multiblock) {
962  if (chan)
963  avctx->channels = chan;
964  if (chmask)
965  avctx->channel_layout = chmask;
966  } else {
967  avctx->channels = s->stereo ? 2 : 1;
968  avctx->channel_layout = s->stereo ? AV_CH_LAYOUT_STEREO :
969  AV_CH_LAYOUT_MONO;
970  }
971 
972  /* get output buffer */
973  frame->nb_samples = s->samples + 1;
974  if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
975  return ret;
976  frame->nb_samples = s->samples;
977  }
978 
979  if (wc->ch_offset + s->stereo >= avctx->channels) {
980  av_log(avctx, AV_LOG_WARNING, "Too many channels coded in a packet.\n");
981  return (avctx->err_recognition & AV_EF_EXPLODE) ? AVERROR_INVALIDDATA : 0;
982  }
983 
984  samples_l = frame->extended_data[wc->ch_offset];
985  if (s->stereo)
986  samples_r = frame->extended_data[wc->ch_offset + 1];
987 
988  wc->ch_offset += 1 + s->stereo;
989 
990  if (s->stereo_in) {
991  ret = wv_unpack_stereo(s, &s->gb, samples_l, samples_r, avctx->sample_fmt);
992  if (ret < 0)
993  return ret;
994  } else {
995  ret = wv_unpack_mono(s, &s->gb, samples_l, avctx->sample_fmt);
996  if (ret < 0)
997  return ret;
998 
999  if (s->stereo)
1000  memcpy(samples_r, samples_l, bpp * s->samples);
1001  }
1002 
1003  return 0;
1004 }
1005 
1006 static void wavpack_decode_flush(AVCodecContext *avctx)
1007 {
1008  WavpackContext *s = avctx->priv_data;
1009  int i;
1010 
1011  for (i = 0; i < s->fdec_num; i++)
1012  wv_reset_saved_context(s->fdec[i]);
1013 }
1014 
1015 static int wavpack_decode_frame(AVCodecContext *avctx, void *data,
1016  int *got_frame_ptr, AVPacket *avpkt)
1017 {
1018  WavpackContext *s = avctx->priv_data;
1019  const uint8_t *buf = avpkt->data;
1020  int buf_size = avpkt->size;
1021  AVFrame *frame = data;
1022  int frame_size, ret, frame_flags;
1023 
1024  if (avpkt->size <= WV_HEADER_SIZE)
1025  return AVERROR_INVALIDDATA;
1026 
1027  s->block = 0;
1028  s->ch_offset = 0;
1029 
1030  /* determine number of samples */
1031  s->samples = AV_RL32(buf + 20);
1032  frame_flags = AV_RL32(buf + 24);
1033  if (s->samples <= 0 || s->samples > WV_MAX_SAMPLES) {
1034  av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n",
1035  s->samples);
1036  return AVERROR_INVALIDDATA;
1037  }
1038 
1039  if (frame_flags & 0x80) {
1040  avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1041  } else if ((frame_flags & 0x03) <= 1) {
1042  avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
1043  } else {
1044  avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
1045  avctx->bits_per_raw_sample = ((frame_flags & 0x03) + 1) << 3;
1046  }
1047 
1048  while (buf_size > 0) {
1049  if (buf_size <= WV_HEADER_SIZE)
1050  break;
1051  frame_size = AV_RL32(buf + 4) - 12;
1052  buf += 20;
1053  buf_size -= 20;
1054  if (frame_size <= 0 || frame_size > buf_size) {
1055  av_log(avctx, AV_LOG_ERROR,
1056  "Block %d has invalid size (size %d vs. %d bytes left)\n",
1057  s->block, frame_size, buf_size);
1058  wavpack_decode_flush(avctx);
1059  return AVERROR_INVALIDDATA;
1060  }
1061  if ((ret = wavpack_decode_block(avctx, s->block,
1062  frame, buf, frame_size)) < 0) {
1063  wavpack_decode_flush(avctx);
1064  return ret;
1065  }
1066  s->block++;
1067  buf += frame_size;
1068  buf_size -= frame_size;
1069  }
1070 
1071  if (s->ch_offset != avctx->channels) {
1072  av_log(avctx, AV_LOG_ERROR, "Not enough channels coded in a packet.\n");
1073  return AVERROR_INVALIDDATA;
1074  }
1075 
1076  *got_frame_ptr = 1;
1077 
1078  return avpkt->size;
1079 }
1080 
1081 AVCodec ff_wavpack_decoder = {
1082  .name = "wavpack",
1083  .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
1084  .type = AVMEDIA_TYPE_AUDIO,
1085  .id = AV_CODEC_ID_WAVPACK,
1086  .priv_data_size = sizeof(WavpackContext),
1087  .init = wavpack_decode_init,
1088  .close = wavpack_decode_end,
1089  .decode = wavpack_decode_frame,
1090  .flush = wavpack_decode_flush,
1091  .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
1092  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
1093 };
Generated on Sat Jan 25 2014 19:51:57 for FFmpeg by   doxygen 1.8.2