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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  ret = get_bits_left(gb);
257  if (ret <= 0) {
258  av_log(ctx->avctx, AV_LOG_ERROR, "Too few bits (%d) left\n", ret);
259  }
260  *last = 1;
261  return 0;
262 }
263 
264 static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc,
265  int S)
266 {
267  int bit;
268 
269  if (s->extra_bits) {
270  S <<= s->extra_bits;
271 
272  if (s->got_extra_bits &&
273  get_bits_left(&s->gb_extra_bits) >= s->extra_bits) {
274  S |= get_bits(&s->gb_extra_bits, s->extra_bits);
275  *crc = *crc * 9 + (S & 0xffff) * 3 + ((unsigned)S >> 16);
276  }
277  }
278 
279  bit = (S & s->and) | s->or;
280  bit = ((S + bit) << s->shift) - bit;
281 
282  if (s->hybrid)
283  bit = av_clip(bit, s->hybrid_minclip, s->hybrid_maxclip);
284 
285  return bit << s->post_shift;
286 }
287 
288 static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S)
289 {
290  union {
291  float f;
292  uint32_t u;
293  } value;
294 
295  unsigned int sign;
296  int exp = s->float_max_exp;
297 
298  if (s->got_extra_bits) {
299  const int max_bits = 1 + 23 + 8 + 1;
300  const int left_bits = get_bits_left(&s->gb_extra_bits);
301 
302  if (left_bits + 8 * FF_INPUT_BUFFER_PADDING_SIZE < max_bits)
303  return 0.0;
304  }
305 
306  if (S) {
307  S <<= s->float_shift;
308  sign = S < 0;
309  if (sign)
310  S = -S;
311  if (S >= 0x1000000) {
312  if (s->got_extra_bits && get_bits1(&s->gb_extra_bits))
313  S = get_bits(&s->gb_extra_bits, 23);
314  else
315  S = 0;
316  exp = 255;
317  } else if (exp) {
318  int shift = 23 - av_log2(S);
319  exp = s->float_max_exp;
320  if (exp <= shift)
321  shift = --exp;
322  exp -= shift;
323 
324  if (shift) {
325  S <<= shift;
326  if ((s->float_flag & WV_FLT_SHIFT_ONES) ||
327  (s->got_extra_bits &&
328  (s->float_flag & WV_FLT_SHIFT_SAME) &&
329  get_bits1(&s->gb_extra_bits))) {
330  S |= (1 << shift) - 1;
331  } else if (s->got_extra_bits &&
332  (s->float_flag & WV_FLT_SHIFT_SENT)) {
333  S |= get_bits(&s->gb_extra_bits, shift);
334  }
335  }
336  } else {
337  exp = s->float_max_exp;
338  }
339  S &= 0x7fffff;
340  } else {
341  sign = 0;
342  exp = 0;
343  if (s->got_extra_bits && (s->float_flag & WV_FLT_ZERO_SENT)) {
344  if (get_bits1(&s->gb_extra_bits)) {
345  S = get_bits(&s->gb_extra_bits, 23);
346  if (s->float_max_exp >= 25)
347  exp = get_bits(&s->gb_extra_bits, 8);
348  sign = get_bits1(&s->gb_extra_bits);
349  } else {
350  if (s->float_flag & WV_FLT_ZERO_SIGN)
351  sign = get_bits1(&s->gb_extra_bits);
352  }
353  }
354  }
355 
356  *crc = *crc * 27 + S * 9 + exp * 3 + sign;
357 
358  value.u = (sign << 31) | (exp << 23) | S;
359  return value.f;
360 }
361 
362 static void wv_reset_saved_context(WavpackFrameContext *s)
363 {
364  s->pos = 0;
365  s->sc.crc = s->extra_sc.crc = 0xFFFFFFFF;
366 }
367 
368 static inline int wv_check_crc(WavpackFrameContext *s, uint32_t crc,
369  uint32_t crc_extra_bits)
370 {
371  if (crc != s->CRC) {
372  av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
373  return AVERROR_INVALIDDATA;
374  }
375  if (s->got_extra_bits && crc_extra_bits != s->crc_extra_bits) {
376  av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
377  return AVERROR_INVALIDDATA;
378  }
379 
380  return 0;
381 }
382 
383 static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb,
384  void *dst_l, void *dst_r, const int type)
385 {
386  int i, j, count = 0;
387  int last, t;
388  int A, B, L, L2, R, R2;
389  int pos = s->pos;
390  uint32_t crc = s->sc.crc;
391  uint32_t crc_extra_bits = s->extra_sc.crc;
392  int16_t *dst16_l = dst_l;
393  int16_t *dst16_r = dst_r;
394  int32_t *dst32_l = dst_l;
395  int32_t *dst32_r = dst_r;
396  float *dstfl_l = dst_l;
397  float *dstfl_r = dst_r;
398 
399  s->one = s->zero = s->zeroes = 0;
400  do {
401  L = wv_get_value(s, gb, 0, &last);
402  if (last)
403  break;
404  R = wv_get_value(s, gb, 1, &last);
405  if (last)
406  break;
407  for (i = 0; i < s->terms; i++) {
408  t = s->decorr[i].value;
409  if (t > 0) {
410  if (t > 8) {
411  if (t & 1) {
412  A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
413  B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
414  } else {
415  A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
416  B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
417  }
418  s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
419  s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
420  j = 0;
421  } else {
422  A = s->decorr[i].samplesA[pos];
423  B = s->decorr[i].samplesB[pos];
424  j = (pos + t) & 7;
425  }
426  if (type != AV_SAMPLE_FMT_S16P) {
427  L2 = L + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
428  R2 = R + ((s->decorr[i].weightB * (int64_t)B + 512) >> 10);
429  } else {
430  L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
431  R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
432  }
433  if (A && L)
434  s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
435  if (B && R)
436  s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
437  s->decorr[i].samplesA[j] = L = L2;
438  s->decorr[i].samplesB[j] = R = R2;
439  } else if (t == -1) {
440  if (type != AV_SAMPLE_FMT_S16P)
441  L2 = L + ((s->decorr[i].weightA * (int64_t)s->decorr[i].samplesA[0] + 512) >> 10);
442  else
443  L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);
444  UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
445  L = L2;
446  if (type != AV_SAMPLE_FMT_S16P)
447  R2 = R + ((s->decorr[i].weightB * (int64_t)L2 + 512) >> 10);
448  else
449  R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
450  UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
451  R = R2;
452  s->decorr[i].samplesA[0] = R;
453  } else {
454  if (type != AV_SAMPLE_FMT_S16P)
455  R2 = R + ((s->decorr[i].weightB * (int64_t)s->decorr[i].samplesB[0] + 512) >> 10);
456  else
457  R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
458  UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
459  R = R2;
460 
461  if (t == -3) {
462  R2 = s->decorr[i].samplesA[0];
463  s->decorr[i].samplesA[0] = R;
464  }
465 
466  if (type != AV_SAMPLE_FMT_S16P)
467  L2 = L + ((s->decorr[i].weightA * (int64_t)R2 + 512) >> 10);
468  else
469  L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
470  UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
471  L = L2;
472  s->decorr[i].samplesB[0] = L;
473  }
474  }
475  pos = (pos + 1) & 7;
476  if (s->joint)
477  L += (R -= (L >> 1));
478  crc = (crc * 3 + L) * 3 + R;
479 
480  if (type == AV_SAMPLE_FMT_FLTP) {
481  *dstfl_l++ = wv_get_value_float(s, &crc_extra_bits, L);
482  *dstfl_r++ = wv_get_value_float(s, &crc_extra_bits, R);
483  } else if (type == AV_SAMPLE_FMT_S32P) {
484  *dst32_l++ = wv_get_value_integer(s, &crc_extra_bits, L);
485  *dst32_r++ = wv_get_value_integer(s, &crc_extra_bits, R);
486  } else {
487  *dst16_l++ = wv_get_value_integer(s, &crc_extra_bits, L);
488  *dst16_r++ = wv_get_value_integer(s, &crc_extra_bits, R);
489  }
490  count++;
491  } while (!last && count < s->samples);
492 
493  wv_reset_saved_context(s);
494 
495  if (last && count < s->samples) {
496  int size = av_get_bytes_per_sample(type);
497  memset((uint8_t*)dst_l + count*size, 0, (s->samples-count)*size);
498  memset((uint8_t*)dst_r + count*size, 0, (s->samples-count)*size);
499  }
500 
501  if ((s->avctx->err_recognition & AV_EF_CRCCHECK) &&
502  wv_check_crc(s, crc, crc_extra_bits))
503  return AVERROR_INVALIDDATA;
504 
505  return 0;
506 }
507 
508 static inline int wv_unpack_mono(WavpackFrameContext *s, GetBitContext *gb,
509  void *dst, const int type)
510 {
511  int i, j, count = 0;
512  int last, t;
513  int A, S, T;
514  int pos = s->pos;
515  uint32_t crc = s->sc.crc;
516  uint32_t crc_extra_bits = s->extra_sc.crc;
517  int16_t *dst16 = dst;
518  int32_t *dst32 = dst;
519  float *dstfl = dst;
520 
521  s->one = s->zero = s->zeroes = 0;
522  do {
523  T = wv_get_value(s, gb, 0, &last);
524  S = 0;
525  if (last)
526  break;
527  for (i = 0; i < s->terms; i++) {
528  t = s->decorr[i].value;
529  if (t > 8) {
530  if (t & 1)
531  A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
532  else
533  A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
534  s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
535  j = 0;
536  } else {
537  A = s->decorr[i].samplesA[pos];
538  j = (pos + t) & 7;
539  }
540  if (type != AV_SAMPLE_FMT_S16P)
541  S = T + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
542  else
543  S = T + ((s->decorr[i].weightA * A + 512) >> 10);
544  if (A && T)
545  s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
546  s->decorr[i].samplesA[j] = T = S;
547  }
548  pos = (pos + 1) & 7;
549  crc = crc * 3 + S;
550 
551  if (type == AV_SAMPLE_FMT_FLTP) {
552  *dstfl++ = wv_get_value_float(s, &crc_extra_bits, S);
553  } else if (type == AV_SAMPLE_FMT_S32P) {
554  *dst32++ = wv_get_value_integer(s, &crc_extra_bits, S);
555  } else {
556  *dst16++ = wv_get_value_integer(s, &crc_extra_bits, S);
557  }
558  count++;
559  } while (!last && count < s->samples);
560 
561  wv_reset_saved_context(s);
562 
563  if (last && count < s->samples) {
564  int size = av_get_bytes_per_sample(type);
565  memset((uint8_t*)dst + count*size, 0, (s->samples-count)*size);
566  }
567 
568  if (s->avctx->err_recognition & AV_EF_CRCCHECK) {
569  int ret = wv_check_crc(s, crc, crc_extra_bits);
570  if (ret < 0 && s->avctx->err_recognition & AV_EF_EXPLODE)
571  return ret;
572  }
573 
574  return 0;
575 }
576 
577 static av_cold int wv_alloc_frame_context(WavpackContext *c)
578 {
579  if (c->fdec_num == WV_MAX_FRAME_DECODERS)
580  return -1;
581 
582  c->fdec[c->fdec_num] = av_mallocz(sizeof(**c->fdec));
583  if (!c->fdec[c->fdec_num])
584  return -1;
585  c->fdec_num++;
586  c->fdec[c->fdec_num - 1]->avctx = c->avctx;
587  wv_reset_saved_context(c->fdec[c->fdec_num - 1]);
588 
589  return 0;
590 }
591 
592 static int init_thread_copy(AVCodecContext *avctx)
593 {
594  WavpackContext *s = avctx->priv_data;
595  s->avctx = avctx;
596  return 0;
597 }
598 
599 static av_cold int wavpack_decode_init(AVCodecContext *avctx)
600 {
601  WavpackContext *s = avctx->priv_data;
602 
603  s->avctx = avctx;
604 
605  s->fdec_num = 0;
606 
607  return 0;
608 }
609 
610 static av_cold int wavpack_decode_end(AVCodecContext *avctx)
611 {
612  WavpackContext *s = avctx->priv_data;
613  int i;
614 
615  for (i = 0; i < s->fdec_num; i++)
616  av_freep(&s->fdec[i]);
617  s->fdec_num = 0;
618 
619  return 0;
620 }
621 
622 static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
623  AVFrame *frame, const uint8_t *buf, int buf_size)
624 {
625  WavpackContext *wc = avctx->priv_data;
626  ThreadFrame tframe = { .f = frame };
627  WavpackFrameContext *s;
628  GetByteContext gb;
629  void *samples_l = NULL, *samples_r = NULL;
630  int ret;
631  int got_terms = 0, got_weights = 0, got_samples = 0,
632  got_entropy = 0, got_bs = 0, got_float = 0, got_hybrid = 0;
633  int i, j, id, size, ssize, weights, t;
634  int bpp, chan = 0, chmask = 0, orig_bpp, sample_rate = 0;
635  int multiblock;
636 
637  if (block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0) {
638  av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n");
639  return AVERROR_INVALIDDATA;
640  }
641 
642  s = wc->fdec[block_no];
643  if (!s) {
644  av_log(avctx, AV_LOG_ERROR, "Context for block %d is not present\n",
645  block_no);
646  return AVERROR_INVALIDDATA;
647  }
648 
649  memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
650  memset(s->ch, 0, sizeof(s->ch));
651  s->extra_bits = 0;
652  s->and = s->or = s->shift = 0;
653  s->got_extra_bits = 0;
654 
655  bytestream2_init(&gb, buf, buf_size);
656 
657  s->samples = bytestream2_get_le32(&gb);
658  if (s->samples != wc->samples) {
659  av_log(avctx, AV_LOG_ERROR, "Mismatching number of samples in "
660  "a sequence: %d and %d\n", wc->samples, s->samples);
661  return AVERROR_INVALIDDATA;
662  }
663  s->frame_flags = bytestream2_get_le32(&gb);
664  bpp = av_get_bytes_per_sample(avctx->sample_fmt);
665  orig_bpp = ((s->frame_flags & 0x03) + 1) << 3;
666  multiblock = (s->frame_flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK;
667 
668  s->stereo = !(s->frame_flags & WV_MONO);
669  s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
670  s->joint = s->frame_flags & WV_JOINT_STEREO;
671  s->hybrid = s->frame_flags & WV_HYBRID_MODE;
672  s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE;
673  s->post_shift = bpp * 8 - orig_bpp + ((s->frame_flags >> 13) & 0x1f);
674  s->hybrid_maxclip = ((1LL << (orig_bpp - 1)) - 1);
675  s->hybrid_minclip = ((-1LL << (orig_bpp - 1)));
676  s->CRC = bytestream2_get_le32(&gb);
677 
678  // parse metadata blocks
679  while (bytestream2_get_bytes_left(&gb)) {
680  id = bytestream2_get_byte(&gb);
681  size = bytestream2_get_byte(&gb);
682  if (id & WP_IDF_LONG) {
683  size |= (bytestream2_get_byte(&gb)) << 8;
684  size |= (bytestream2_get_byte(&gb)) << 16;
685  }
686  size <<= 1; // size is specified in words
687  ssize = size;
688  if (id & WP_IDF_ODD)
689  size--;
690  if (size < 0) {
691  av_log(avctx, AV_LOG_ERROR,
692  "Got incorrect block %02X with size %i\n", id, size);
693  break;
694  }
695  if (bytestream2_get_bytes_left(&gb) < ssize) {
696  av_log(avctx, AV_LOG_ERROR,
697  "Block size %i is out of bounds\n", size);
698  break;
699  }
700  switch (id & WP_IDF_MASK) {
701  case WP_ID_DECTERMS:
702  if (size > MAX_TERMS) {
703  av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
704  s->terms = 0;
705  bytestream2_skip(&gb, ssize);
706  continue;
707  }
708  s->terms = size;
709  for (i = 0; i < s->terms; i++) {
710  uint8_t val = bytestream2_get_byte(&gb);
711  s->decorr[s->terms - i - 1].value = (val & 0x1F) - 5;
712  s->decorr[s->terms - i - 1].delta = val >> 5;
713  }
714  got_terms = 1;
715  break;
716  case WP_ID_DECWEIGHTS:
717  if (!got_terms) {
718  av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
719  continue;
720  }
721  weights = size >> s->stereo_in;
722  if (weights > MAX_TERMS || weights > s->terms) {
723  av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
724  bytestream2_skip(&gb, ssize);
725  continue;
726  }
727  for (i = 0; i < weights; i++) {
728  t = (int8_t)bytestream2_get_byte(&gb);
729  s->decorr[s->terms - i - 1].weightA = t << 3;
730  if (s->decorr[s->terms - i - 1].weightA > 0)
731  s->decorr[s->terms - i - 1].weightA +=
732  (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
733  if (s->stereo_in) {
734  t = (int8_t)bytestream2_get_byte(&gb);
735  s->decorr[s->terms - i - 1].weightB = t << 3;
736  if (s->decorr[s->terms - i - 1].weightB > 0)
737  s->decorr[s->terms - i - 1].weightB +=
738  (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
739  }
740  }
741  got_weights = 1;
742  break;
743  case WP_ID_DECSAMPLES:
744  if (!got_terms) {
745  av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
746  continue;
747  }
748  t = 0;
749  for (i = s->terms - 1; (i >= 0) && (t < size); i--) {
750  if (s->decorr[i].value > 8) {
751  s->decorr[i].samplesA[0] =
752  wp_exp2(bytestream2_get_le16(&gb));
753  s->decorr[i].samplesA[1] =
754  wp_exp2(bytestream2_get_le16(&gb));
755 
756  if (s->stereo_in) {
757  s->decorr[i].samplesB[0] =
758  wp_exp2(bytestream2_get_le16(&gb));
759  s->decorr[i].samplesB[1] =
760  wp_exp2(bytestream2_get_le16(&gb));
761  t += 4;
762  }
763  t += 4;
764  } else if (s->decorr[i].value < 0) {
765  s->decorr[i].samplesA[0] =
766  wp_exp2(bytestream2_get_le16(&gb));
767  s->decorr[i].samplesB[0] =
768  wp_exp2(bytestream2_get_le16(&gb));
769  t += 4;
770  } else {
771  for (j = 0; j < s->decorr[i].value; j++) {
772  s->decorr[i].samplesA[j] =
773  wp_exp2(bytestream2_get_le16(&gb));
774  if (s->stereo_in) {
775  s->decorr[i].samplesB[j] =
776  wp_exp2(bytestream2_get_le16(&gb));
777  }
778  }
779  t += s->decorr[i].value * 2 * (s->stereo_in + 1);
780  }
781  }
782  got_samples = 1;
783  break;
784  case WP_ID_ENTROPY:
785  if (size != 6 * (s->stereo_in + 1)) {
786  av_log(avctx, AV_LOG_ERROR,
787  "Entropy vars size should be %i, got %i.\n",
788  6 * (s->stereo_in + 1), size);
789  bytestream2_skip(&gb, ssize);
790  continue;
791  }
792  for (j = 0; j <= s->stereo_in; j++)
793  for (i = 0; i < 3; i++) {
794  s->ch[j].median[i] = wp_exp2(bytestream2_get_le16(&gb));
795  }
796  got_entropy = 1;
797  break;
798  case WP_ID_HYBRID:
799  if (s->hybrid_bitrate) {
800  for (i = 0; i <= s->stereo_in; i++) {
801  s->ch[i].slow_level = wp_exp2(bytestream2_get_le16(&gb));
802  size -= 2;
803  }
804  }
805  for (i = 0; i < (s->stereo_in + 1); i++) {
806  s->ch[i].bitrate_acc = bytestream2_get_le16(&gb) << 16;
807  size -= 2;
808  }
809  if (size > 0) {
810  for (i = 0; i < (s->stereo_in + 1); i++) {
811  s->ch[i].bitrate_delta =
812  wp_exp2((int16_t)bytestream2_get_le16(&gb));
813  }
814  } else {
815  for (i = 0; i < (s->stereo_in + 1); i++)
816  s->ch[i].bitrate_delta = 0;
817  }
818  got_hybrid = 1;
819  break;
820  case WP_ID_INT32INFO: {
821  uint8_t val[4];
822  if (size != 4) {
823  av_log(avctx, AV_LOG_ERROR,
824  "Invalid INT32INFO, size = %i\n",
825  size);
826  bytestream2_skip(&gb, ssize - 4);
827  continue;
828  }
829  bytestream2_get_buffer(&gb, val, 4);
830  if (val[0]) {
831  s->extra_bits = val[0];
832  } else if (val[1]) {
833  s->shift = val[1];
834  } else if (val[2]) {
835  s->and = s->or = 1;
836  s->shift = val[2];
837  } else if (val[3]) {
838  s->and = 1;
839  s->shift = val[3];
840  }
841  /* original WavPack decoder forces 32-bit lossy sound to be treated
842  * as 24-bit one in order to have proper clipping */
843  if (s->hybrid && bpp == 4 && s->post_shift < 8 && s->shift > 8) {
844  s->post_shift += 8;
845  s->shift -= 8;
846  s->hybrid_maxclip >>= 8;
847  s->hybrid_minclip >>= 8;
848  }
849  break;
850  }
851  case WP_ID_FLOATINFO:
852  if (size != 4) {
853  av_log(avctx, AV_LOG_ERROR,
854  "Invalid FLOATINFO, size = %i\n", size);
855  bytestream2_skip(&gb, ssize);
856  continue;
857  }
858  s->float_flag = bytestream2_get_byte(&gb);
859  s->float_shift = bytestream2_get_byte(&gb);
860  s->float_max_exp = bytestream2_get_byte(&gb);
861  got_float = 1;
862  bytestream2_skip(&gb, 1);
863  break;
864  case WP_ID_DATA:
865  s->sc.offset = bytestream2_tell(&gb);
866  s->sc.size = size * 8;
867  if ((ret = init_get_bits8(&s->gb, gb.buffer, size)) < 0)
868  return ret;
869  s->data_size = size * 8;
870  bytestream2_skip(&gb, size);
871  got_bs = 1;
872  break;
873  case WP_ID_EXTRABITS:
874  if (size <= 4) {
875  av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n",
876  size);
877  bytestream2_skip(&gb, size);
878  continue;
879  }
880  s->extra_sc.offset = bytestream2_tell(&gb);
881  s->extra_sc.size = size * 8;
882  if ((ret = init_get_bits8(&s->gb_extra_bits, gb.buffer, size)) < 0)
883  return ret;
884  s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);
885  bytestream2_skip(&gb, size);
886  s->got_extra_bits = 1;
887  break;
888  case WP_ID_CHANINFO:
889  if (size <= 1) {
890  av_log(avctx, AV_LOG_ERROR,
891  "Insufficient channel information\n");
892  return AVERROR_INVALIDDATA;
893  }
894  chan = bytestream2_get_byte(&gb);
895  switch (size - 2) {
896  case 0:
897  chmask = bytestream2_get_byte(&gb);
898  break;
899  case 1:
900  chmask = bytestream2_get_le16(&gb);
901  break;
902  case 2:
903  chmask = bytestream2_get_le24(&gb);
904  break;
905  case 3:
906  chmask = bytestream2_get_le32(&gb);
907  break;
908  case 5:
909  size = bytestream2_get_byte(&gb);
910  if (avctx->channels != size)
911  av_log(avctx, AV_LOG_WARNING, "%i channels signalled"
912  " instead of %i.\n", size, avctx->channels);
913  chan |= (bytestream2_get_byte(&gb) & 0xF) << 8;
914  chmask = bytestream2_get_le16(&gb);
915  break;
916  default:
917  av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n",
918  size);
919  chan = avctx->channels;
920  chmask = avctx->channel_layout;
921  }
922  break;
923  case WP_ID_SAMPLE_RATE:
924  if (size != 3) {
925  av_log(avctx, AV_LOG_ERROR, "Invalid custom sample rate.\n");
926  return AVERROR_INVALIDDATA;
927  }
928  sample_rate = bytestream2_get_le24(&gb);
929  break;
930  default:
931  bytestream2_skip(&gb, size);
932  }
933  if (id & WP_IDF_ODD)
934  bytestream2_skip(&gb, 1);
935  }
936 
937  if (!got_terms) {
938  av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
939  return AVERROR_INVALIDDATA;
940  }
941  if (!got_weights) {
942  av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
943  return AVERROR_INVALIDDATA;
944  }
945  if (!got_samples) {
946  av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
947  return AVERROR_INVALIDDATA;
948  }
949  if (!got_entropy) {
950  av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
951  return AVERROR_INVALIDDATA;
952  }
953  if (s->hybrid && !got_hybrid) {
954  av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");
955  return AVERROR_INVALIDDATA;
956  }
957  if (!got_bs) {
958  av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
959  return AVERROR_INVALIDDATA;
960  }
961  if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLTP) {
962  av_log(avctx, AV_LOG_ERROR, "Float information not found\n");
963  return AVERROR_INVALIDDATA;
964  }
965  if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLTP) {
966  const int size = get_bits_left(&s->gb_extra_bits);
967  const int wanted = s->samples * s->extra_bits << s->stereo_in;
968  if (size < wanted) {
969  av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");
970  s->got_extra_bits = 0;
971  }
972  }
973 
974  if (!wc->ch_offset) {
975  int sr = (s->frame_flags >> 23) & 0xf;
976  if (sr == 0xf) {
977  if (!sample_rate) {
978  av_log(avctx, AV_LOG_ERROR, "Custom sample rate missing.\n");
979  return AVERROR_INVALIDDATA;
980  }
981  avctx->sample_rate = sample_rate;
982  } else
983  avctx->sample_rate = wv_rates[sr];
984 
985  if (multiblock) {
986  if (chan)
987  avctx->channels = chan;
988  if (chmask)
989  avctx->channel_layout = chmask;
990  } else {
991  avctx->channels = s->stereo ? 2 : 1;
992  avctx->channel_layout = s->stereo ? AV_CH_LAYOUT_STEREO :
993  AV_CH_LAYOUT_MONO;
994  }
995 
996  /* get output buffer */
997  frame->nb_samples = s->samples + 1;
998  if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
999  return ret;
1000  frame->nb_samples = s->samples;
1001  }
1002 
1003  if (wc->ch_offset + s->stereo >= avctx->channels) {
1004  av_log(avctx, AV_LOG_WARNING, "Too many channels coded in a packet.\n");
1005  return (avctx->err_recognition & AV_EF_EXPLODE) ? AVERROR_INVALIDDATA : 0;
1006  }
1007 
1008  samples_l = frame->extended_data[wc->ch_offset];
1009  if (s->stereo)
1010  samples_r = frame->extended_data[wc->ch_offset + 1];
1011 
1012  wc->ch_offset += 1 + s->stereo;
1013 
1014  if (s->stereo_in) {
1015  ret = wv_unpack_stereo(s, &s->gb, samples_l, samples_r, avctx->sample_fmt);
1016  if (ret < 0)
1017  return ret;
1018  } else {
1019  ret = wv_unpack_mono(s, &s->gb, samples_l, avctx->sample_fmt);
1020  if (ret < 0)
1021  return ret;
1022 
1023  if (s->stereo)
1024  memcpy(samples_r, samples_l, bpp * s->samples);
1025  }
1026 
1027  return 0;
1028 }
1029 
1030 static void wavpack_decode_flush(AVCodecContext *avctx)
1031 {
1032  WavpackContext *s = avctx->priv_data;
1033  int i;
1034 
1035  for (i = 0; i < s->fdec_num; i++)
1036  wv_reset_saved_context(s->fdec[i]);
1037 }
1038 
1039 static int wavpack_decode_frame(AVCodecContext *avctx, void *data,
1040  int *got_frame_ptr, AVPacket *avpkt)
1041 {
1042  WavpackContext *s = avctx->priv_data;
1043  const uint8_t *buf = avpkt->data;
1044  int buf_size = avpkt->size;
1045  AVFrame *frame = data;
1046  int frame_size, ret, frame_flags;
1047 
1048  if (avpkt->size <= WV_HEADER_SIZE)
1049  return AVERROR_INVALIDDATA;
1050 
1051  s->block = 0;
1052  s->ch_offset = 0;
1053 
1054  /* determine number of samples */
1055  s->samples = AV_RL32(buf + 20);
1056  frame_flags = AV_RL32(buf + 24);
1057  if (s->samples <= 0 || s->samples > WV_MAX_SAMPLES) {
1058  av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n",
1059  s->samples);
1060  return AVERROR_INVALIDDATA;
1061  }
1062 
1063  if (frame_flags & 0x80) {
1064  avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1065  } else if ((frame_flags & 0x03) <= 1) {
1066  avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
1067  } else {
1068  avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
1069  avctx->bits_per_raw_sample = ((frame_flags & 0x03) + 1) << 3;
1070  }
1071 
1072  while (buf_size > 0) {
1073  if (buf_size <= WV_HEADER_SIZE)
1074  break;
1075  frame_size = AV_RL32(buf + 4) - 12;
1076  buf += 20;
1077  buf_size -= 20;
1078  if (frame_size <= 0 || frame_size > buf_size) {
1079  av_log(avctx, AV_LOG_ERROR,
1080  "Block %d has invalid size (size %d vs. %d bytes left)\n",
1081  s->block, frame_size, buf_size);
1082  wavpack_decode_flush(avctx);
1083  return AVERROR_INVALIDDATA;
1084  }
1085  if ((ret = wavpack_decode_block(avctx, s->block,
1086  frame, buf, frame_size)) < 0) {
1087  wavpack_decode_flush(avctx);
1088  return ret;
1089  }
1090  s->block++;
1091  buf += frame_size;
1092  buf_size -= frame_size;
1093  }
1094 
1095  if (s->ch_offset != avctx->channels) {
1096  av_log(avctx, AV_LOG_ERROR, "Not enough channels coded in a packet.\n");
1097  return AVERROR_INVALIDDATA;
1098  }
1099 
1100  *got_frame_ptr = 1;
1101 
1102  return avpkt->size;
1103 }
1104 
1105 AVCodec ff_wavpack_decoder = {
1106  .name = "wavpack",
1107  .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
1108  .type = AVMEDIA_TYPE_AUDIO,
1109  .id = AV_CODEC_ID_WAVPACK,
1110  .priv_data_size = sizeof(WavpackContext),
1111  .init = wavpack_decode_init,
1112  .close = wavpack_decode_end,
1113  .decode = wavpack_decode_frame,
1114  .flush = wavpack_decode_flush,
1115  .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
1116  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
1117 };
Generated on Sun Sep 14 2014 18:56:06 for FFmpeg by   doxygen 1.8.2