wmaprodec.c
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1 /*
2  * Wmapro compatible decoder
3  * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
4  * Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
89 #include "libavutil/intfloat.h"
90 #include "libavutil/intreadwrite.h"
91 #include "avcodec.h"
92 #include "internal.h"
93 #include "get_bits.h"
94 #include "put_bits.h"
95 #include "wmaprodata.h"
96 #include "dsputil.h"
97 #include "fmtconvert.h"
98 #include "sinewin.h"
99 #include "wma.h"
100 
102 #define WMAPRO_MAX_CHANNELS 8
103 #define MAX_SUBFRAMES 32
104 #define MAX_BANDS 29
105 #define MAX_FRAMESIZE 32768
106 
107 #define WMAPRO_BLOCK_MIN_BITS 6
108 #define WMAPRO_BLOCK_MAX_BITS 12
109 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS)
110 #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1)
111 
112 
113 #define VLCBITS 9
114 #define SCALEVLCBITS 8
115 #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS)
116 #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS)
117 #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS)
118 #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS)
119 #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS)
120 
121 static VLC sf_vlc;
122 static VLC sf_rl_vlc;
123 static VLC vec4_vlc;
124 static VLC vec2_vlc;
125 static VLC vec1_vlc;
126 static VLC coef_vlc[2];
127 static float sin64[33];
128 
132 typedef struct {
133  int16_t prev_block_len;
134  uint8_t transmit_coefs;
135  uint8_t num_subframes;
136  uint16_t subframe_len[MAX_SUBFRAMES];
137  uint16_t subframe_offset[MAX_SUBFRAMES];
138  uint8_t cur_subframe;
139  uint16_t decoded_samples;
140  uint8_t grouped;
142  int8_t reuse_sf;
145  int saved_scale_factors[2][MAX_BANDS];
148  uint8_t table_idx;
149  float* coeffs;
150  uint16_t num_vec_coeffs;
153 
157 typedef struct {
158  uint8_t num_channels;
159  int8_t transform;
160  int8_t transform_band[MAX_BANDS];
161  float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS];
162  float* channel_data[WMAPRO_MAX_CHANNELS];
164 
168 typedef struct WMAProDecodeCtx {
169  /* generic decoder variables */
174  uint8_t frame_data[MAX_FRAMESIZE +
180 
181  /* frame size dependent frame information (set during initialization) */
182  uint32_t decode_flags;
183  uint8_t len_prefix;
185  uint8_t bits_per_sample;
186  uint16_t samples_per_frame;
187  uint16_t log2_frame_size;
188  int8_t num_channels;
189  int8_t lfe_channel;
198 
199  /* packet decode state */
202  uint8_t packet_offset;
207  uint8_t packet_loss;
208  uint8_t packet_done;
209 
210  /* frame decode state */
211  uint32_t frame_num;
214  uint8_t drc_gain;
215  int8_t skip_frame;
217 
218  /* subframe/block decode state */
219  int16_t subframe_len;
222  int8_t num_bands;
224  int16_t* cur_sfb_offsets;
225  uint8_t table_idx;
226  int8_t esc_len;
227 
228  uint8_t num_chgroups;
230 
233 
234 
240 {
241 #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
242 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b);
243 
244  PRINT("ed sample bit depth", s->bits_per_sample);
245  PRINT_HEX("ed decode flags", s->decode_flags);
246  PRINT("samples per frame", s->samples_per_frame);
247  PRINT("log2 frame size", s->log2_frame_size);
248  PRINT("max num subframes", s->max_num_subframes);
249  PRINT("len prefix", s->len_prefix);
250  PRINT("num channels", s->num_channels);
251 }
252 
259 {
260  WMAProDecodeCtx *s = avctx->priv_data;
261  int i;
262 
263  for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
264  ff_mdct_end(&s->mdct_ctx[i]);
265 
266  return 0;
267 }
268 
275 {
276  WMAProDecodeCtx *s = avctx->priv_data;
277  uint8_t *edata_ptr = avctx->extradata;
278  unsigned int channel_mask;
279  int i;
280  int log2_max_num_subframes;
281  int num_possible_block_sizes;
282 
283  s->avctx = avctx;
284  dsputil_init(&s->dsp, avctx);
285  ff_fmt_convert_init(&s->fmt_conv, avctx);
287 
288  avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
289 
290  if (avctx->extradata_size >= 18) {
291  s->decode_flags = AV_RL16(edata_ptr+14);
292  channel_mask = AV_RL32(edata_ptr+2);
293  s->bits_per_sample = AV_RL16(edata_ptr);
295  for (i = 0; i < avctx->extradata_size; i++)
296  av_dlog(avctx, "[%x] ", avctx->extradata[i]);
297  av_dlog(avctx, "\n");
298 
299  } else {
300  av_log_ask_for_sample(avctx, "Unknown extradata size\n");
301  return AVERROR_INVALIDDATA;
302  }
303 
305  s->log2_frame_size = av_log2(avctx->block_align) + 4;
306 
308  s->skip_frame = 1; /* skip first frame */
309  s->packet_loss = 1;
310  s->len_prefix = (s->decode_flags & 0x40);
311 
314  3, s->decode_flags);
315 
317  log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
318  s->max_num_subframes = 1 << log2_max_num_subframes;
319  if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
320  s->max_subframe_len_bit = 1;
321  s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
322 
323  num_possible_block_sizes = log2_max_num_subframes + 1;
325  s->dynamic_range_compression = (s->decode_flags & 0x80);
326 
327  if (s->max_num_subframes > MAX_SUBFRAMES) {
328  av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n",
329  s->max_num_subframes);
330  return AVERROR_INVALIDDATA;
331  }
332 
333  if (s->avctx->sample_rate <= 0) {
334  av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
335  return AVERROR_INVALIDDATA;
336  }
337 
338  s->num_channels = avctx->channels;
339 
340  if (s->num_channels < 0) {
341  av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
342  return AVERROR_INVALIDDATA;
343  } else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
344  av_log_ask_for_sample(avctx, "unsupported number of channels\n");
345  return AVERROR_PATCHWELCOME;
346  }
347 
349  for (i = 0; i < s->num_channels; i++)
351 
353  s->lfe_channel = -1;
354 
355  if (channel_mask & 8) {
356  unsigned int mask;
357  for (mask = 1; mask < 16; mask <<= 1) {
358  if (channel_mask & mask)
359  ++s->lfe_channel;
360  }
361  }
362 
364  scale_huffbits, 1, 1,
365  scale_huffcodes, 2, 2, 616);
366 
368  scale_rl_huffbits, 1, 1,
369  scale_rl_huffcodes, 4, 4, 1406);
370 
371  INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
372  coef0_huffbits, 1, 1,
373  coef0_huffcodes, 4, 4, 2108);
374 
375  INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
376  coef1_huffbits, 1, 1,
377  coef1_huffcodes, 4, 4, 3912);
378 
380  vec4_huffbits, 1, 1,
381  vec4_huffcodes, 2, 2, 604);
382 
384  vec2_huffbits, 1, 1,
385  vec2_huffcodes, 2, 2, 562);
386 
388  vec1_huffbits, 1, 1,
389  vec1_huffcodes, 2, 2, 562);
390 
393  for (i = 0; i < num_possible_block_sizes; i++) {
394  int subframe_len = s->samples_per_frame >> i;
395  int x;
396  int band = 1;
397 
398  s->sfb_offsets[i][0] = 0;
399 
400  for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
401  int offset = (subframe_len * 2 * critical_freq[x])
402  / s->avctx->sample_rate + 2;
403  offset &= ~3;
404  if (offset > s->sfb_offsets[i][band - 1])
405  s->sfb_offsets[i][band++] = offset;
406  }
407  s->sfb_offsets[i][band - 1] = subframe_len;
408  s->num_sfb[i] = band - 1;
409  }
410 
411 
417  for (i = 0; i < num_possible_block_sizes; i++) {
418  int b;
419  for (b = 0; b < s->num_sfb[i]; b++) {
420  int x;
421  int offset = ((s->sfb_offsets[i][b]
422  + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
423  for (x = 0; x < num_possible_block_sizes; x++) {
424  int v = 0;
425  while (s->sfb_offsets[x][v + 1] << x < offset)
426  ++v;
427  s->sf_offsets[i][x][b] = v;
428  }
429  }
430  }
431 
433  for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
435  1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
436  / (1 << (s->bits_per_sample - 1)));
437 
439  for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
440  const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
441  ff_init_ff_sine_windows(win_idx);
442  s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
443  }
444 
446  for (i = 0; i < num_possible_block_sizes; i++) {
447  int block_size = s->samples_per_frame >> i;
448  int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
449  / s->avctx->sample_rate;
450  s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
451  }
452 
454  for (i = 0; i < 33; i++)
455  sin64[i] = sin(i*M_PI / 64.0);
456 
457  if (avctx->debug & FF_DEBUG_BITSTREAM)
458  dump_context(s);
459 
460  avctx->channel_layout = channel_mask;
461 
463  avctx->coded_frame = &s->frame;
464 
465  return 0;
466 }
467 
474 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
475 {
476  int frame_len_shift = 0;
477  int subframe_len;
478 
480  if (offset == s->samples_per_frame - s->min_samples_per_subframe)
481  return s->min_samples_per_subframe;
482 
484  if (s->max_subframe_len_bit) {
485  if (get_bits1(&s->gb))
486  frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
487  } else
488  frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
489 
490  subframe_len = s->samples_per_frame >> frame_len_shift;
491 
493  if (subframe_len < s->min_samples_per_subframe ||
494  subframe_len > s->samples_per_frame) {
495  av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
496  subframe_len);
497  return AVERROR_INVALIDDATA;
498  }
499  return subframe_len;
500 }
501 
523 {
524  uint16_t num_samples[WMAPRO_MAX_CHANNELS];
525  uint8_t contains_subframe[WMAPRO_MAX_CHANNELS];
526  int channels_for_cur_subframe = s->num_channels;
527  int fixed_channel_layout = 0;
528  int min_channel_len = 0;
529  int c;
530 
531  /* Should never consume more than 3073 bits (256 iterations for the
532  * while loop when always the minimum amount of 128 samples is substracted
533  * from missing samples in the 8 channel case).
534  * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4)
535  */
536 
538  for (c = 0; c < s->num_channels; c++)
539  s->channel[c].num_subframes = 0;
540 
541  memset(num_samples, 0, sizeof(num_samples));
542 
543  if (s->max_num_subframes == 1 || get_bits1(&s->gb))
544  fixed_channel_layout = 1;
545 
547  do {
548  int subframe_len;
549 
551  for (c = 0; c < s->num_channels; c++) {
552  if (num_samples[c] == min_channel_len) {
553  if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
554  (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
555  contains_subframe[c] = 1;
556  else
557  contains_subframe[c] = get_bits1(&s->gb);
558  } else
559  contains_subframe[c] = 0;
560  }
561 
563  if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
564  return AVERROR_INVALIDDATA;
565 
567  min_channel_len += subframe_len;
568  for (c = 0; c < s->num_channels; c++) {
569  WMAProChannelCtx* chan = &s->channel[c];
570 
571  if (contains_subframe[c]) {
572  if (chan->num_subframes >= MAX_SUBFRAMES) {
574  "broken frame: num subframes > 31\n");
575  return AVERROR_INVALIDDATA;
576  }
577  chan->subframe_len[chan->num_subframes] = subframe_len;
578  num_samples[c] += subframe_len;
579  ++chan->num_subframes;
580  if (num_samples[c] > s->samples_per_frame) {
581  av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
582  "channel len > samples_per_frame\n");
583  return AVERROR_INVALIDDATA;
584  }
585  } else if (num_samples[c] <= min_channel_len) {
586  if (num_samples[c] < min_channel_len) {
587  channels_for_cur_subframe = 0;
588  min_channel_len = num_samples[c];
589  }
590  ++channels_for_cur_subframe;
591  }
592  }
593  } while (min_channel_len < s->samples_per_frame);
594 
595  for (c = 0; c < s->num_channels; c++) {
596  int i;
597  int offset = 0;
598  for (i = 0; i < s->channel[c].num_subframes; i++) {
599  av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
600  " len %i\n", s->frame_num, c, i,
601  s->channel[c].subframe_len[i]);
602  s->channel[c].subframe_offset[i] = offset;
603  offset += s->channel[c].subframe_len[i];
604  }
605  }
606 
607  return 0;
608 }
609 
616  WMAProChannelGrp *chgroup)
617 {
618  int i;
619  int offset = 0;
620  int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
621  memset(chgroup->decorrelation_matrix, 0, s->num_channels *
622  s->num_channels * sizeof(*chgroup->decorrelation_matrix));
623 
624  for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
625  rotation_offset[i] = get_bits(&s->gb, 6);
626 
627  for (i = 0; i < chgroup->num_channels; i++)
628  chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
629  get_bits1(&s->gb) ? 1.0 : -1.0;
630 
631  for (i = 1; i < chgroup->num_channels; i++) {
632  int x;
633  for (x = 0; x < i; x++) {
634  int y;
635  for (y = 0; y < i + 1; y++) {
636  float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
637  float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
638  int n = rotation_offset[offset + x];
639  float sinv;
640  float cosv;
641 
642  if (n < 32) {
643  sinv = sin64[n];
644  cosv = sin64[32 - n];
645  } else {
646  sinv = sin64[64 - n];
647  cosv = -sin64[n - 32];
648  }
649 
650  chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
651  (v1 * sinv) - (v2 * cosv);
652  chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
653  (v1 * cosv) + (v2 * sinv);
654  }
655  }
656  offset += i;
657  }
658 }
659 
666 {
667  int i;
668  /* should never consume more than 1921 bits for the 8 channel case
669  * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS
670  * + MAX_CHANNELS + MAX_BANDS + 1)
671  */
672 
674  s->num_chgroups = 0;
675  if (s->num_channels > 1) {
676  int remaining_channels = s->channels_for_cur_subframe;
677 
678  if (get_bits1(&s->gb)) {
680  "unsupported channel transform bit\n");
681  return AVERROR_INVALIDDATA;
682  }
683 
684  for (s->num_chgroups = 0; remaining_channels &&
686  WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
687  float** channel_data = chgroup->channel_data;
688  chgroup->num_channels = 0;
689  chgroup->transform = 0;
690 
692  if (remaining_channels > 2) {
693  for (i = 0; i < s->channels_for_cur_subframe; i++) {
694  int channel_idx = s->channel_indexes_for_cur_subframe[i];
695  if (!s->channel[channel_idx].grouped
696  && get_bits1(&s->gb)) {
697  ++chgroup->num_channels;
698  s->channel[channel_idx].grouped = 1;
699  *channel_data++ = s->channel[channel_idx].coeffs;
700  }
701  }
702  } else {
703  chgroup->num_channels = remaining_channels;
704  for (i = 0; i < s->channels_for_cur_subframe; i++) {
705  int channel_idx = s->channel_indexes_for_cur_subframe[i];
706  if (!s->channel[channel_idx].grouped)
707  *channel_data++ = s->channel[channel_idx].coeffs;
708  s->channel[channel_idx].grouped = 1;
709  }
710  }
711 
713  if (chgroup->num_channels == 2) {
714  if (get_bits1(&s->gb)) {
715  if (get_bits1(&s->gb)) {
717  "unsupported channel transform type\n");
718  }
719  } else {
720  chgroup->transform = 1;
721  if (s->num_channels == 2) {
722  chgroup->decorrelation_matrix[0] = 1.0;
723  chgroup->decorrelation_matrix[1] = -1.0;
724  chgroup->decorrelation_matrix[2] = 1.0;
725  chgroup->decorrelation_matrix[3] = 1.0;
726  } else {
728  chgroup->decorrelation_matrix[0] = 0.70703125;
729  chgroup->decorrelation_matrix[1] = -0.70703125;
730  chgroup->decorrelation_matrix[2] = 0.70703125;
731  chgroup->decorrelation_matrix[3] = 0.70703125;
732  }
733  }
734  } else if (chgroup->num_channels > 2) {
735  if (get_bits1(&s->gb)) {
736  chgroup->transform = 1;
737  if (get_bits1(&s->gb)) {
738  decode_decorrelation_matrix(s, chgroup);
739  } else {
741  if (chgroup->num_channels > 6) {
743  "coupled channels > 6\n");
744  } else {
745  memcpy(chgroup->decorrelation_matrix,
747  chgroup->num_channels * chgroup->num_channels *
748  sizeof(*chgroup->decorrelation_matrix));
749  }
750  }
751  }
752  }
753 
755  if (chgroup->transform) {
756  if (!get_bits1(&s->gb)) {
757  int i;
759  for (i = 0; i < s->num_bands; i++) {
760  chgroup->transform_band[i] = get_bits1(&s->gb);
761  }
762  } else {
763  memset(chgroup->transform_band, 1, s->num_bands);
764  }
765  }
766  remaining_channels -= chgroup->num_channels;
767  }
768  }
769  return 0;
770 }
771 
778 static int decode_coeffs(WMAProDecodeCtx *s, int c)
779 {
780  /* Integers 0..15 as single-precision floats. The table saves a
781  costly int to float conversion, and storing the values as
782  integers allows fast sign-flipping. */
783  static const uint32_t fval_tab[16] = {
784  0x00000000, 0x3f800000, 0x40000000, 0x40400000,
785  0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
786  0x41000000, 0x41100000, 0x41200000, 0x41300000,
787  0x41400000, 0x41500000, 0x41600000, 0x41700000,
788  };
789  int vlctable;
790  VLC* vlc;
791  WMAProChannelCtx* ci = &s->channel[c];
792  int rl_mode = 0;
793  int cur_coeff = 0;
794  int num_zeros = 0;
795  const uint16_t* run;
796  const float* level;
797 
798  av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
799 
800  vlctable = get_bits1(&s->gb);
801  vlc = &coef_vlc[vlctable];
802 
803  if (vlctable) {
804  run = coef1_run;
805  level = coef1_level;
806  } else {
807  run = coef0_run;
808  level = coef0_level;
809  }
810 
813  while ((s->transmit_num_vec_coeffs || !rl_mode) &&
814  (cur_coeff + 3 < ci->num_vec_coeffs)) {
815  uint32_t vals[4];
816  int i;
817  unsigned int idx;
818 
819  idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
820 
821  if (idx == HUFF_VEC4_SIZE - 1) {
822  for (i = 0; i < 4; i += 2) {
823  idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
824  if (idx == HUFF_VEC2_SIZE - 1) {
825  uint32_t v0, v1;
826  v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
827  if (v0 == HUFF_VEC1_SIZE - 1)
828  v0 += ff_wma_get_large_val(&s->gb);
829  v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
830  if (v1 == HUFF_VEC1_SIZE - 1)
831  v1 += ff_wma_get_large_val(&s->gb);
832  vals[i ] = av_float2int(v0);
833  vals[i+1] = av_float2int(v1);
834  } else {
835  vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
836  vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
837  }
838  }
839  } else {
840  vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
841  vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
842  vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
843  vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
844  }
845 
847  for (i = 0; i < 4; i++) {
848  if (vals[i]) {
849  uint32_t sign = get_bits1(&s->gb) - 1;
850  AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
851  num_zeros = 0;
852  } else {
853  ci->coeffs[cur_coeff] = 0;
856  rl_mode |= (++num_zeros > s->subframe_len >> 8);
857  }
858  ++cur_coeff;
859  }
860  }
861 
863  if (cur_coeff < s->subframe_len) {
864  memset(&ci->coeffs[cur_coeff], 0,
865  sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
866  if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
867  level, run, 1, ci->coeffs,
868  cur_coeff, s->subframe_len,
869  s->subframe_len, s->esc_len, 0))
870  return AVERROR_INVALIDDATA;
871  }
872 
873  return 0;
874 }
875 
882 {
883  int i;
884 
889  for (i = 0; i < s->channels_for_cur_subframe; i++) {
890  int c = s->channel_indexes_for_cur_subframe[i];
891  int* sf;
892  int* sf_end;
894  sf_end = s->channel[c].scale_factors + s->num_bands;
895 
901  if (s->channel[c].reuse_sf) {
902  const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
903  int b;
904  for (b = 0; b < s->num_bands; b++)
905  s->channel[c].scale_factors[b] =
906  s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
907  }
908 
909  if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
910 
911  if (!s->channel[c].reuse_sf) {
912  int val;
914  s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
915  val = 45 / s->channel[c].scale_factor_step;
916  for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
917  val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
918  *sf = val;
919  }
920  } else {
921  int i;
923  for (i = 0; i < s->num_bands; i++) {
924  int idx;
925  int skip;
926  int val;
927  int sign;
928 
929  idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
930 
931  if (!idx) {
932  uint32_t code = get_bits(&s->gb, 14);
933  val = code >> 6;
934  sign = (code & 1) - 1;
935  skip = (code & 0x3f) >> 1;
936  } else if (idx == 1) {
937  break;
938  } else {
939  skip = scale_rl_run[idx];
940  val = scale_rl_level[idx];
941  sign = get_bits1(&s->gb)-1;
942  }
943 
944  i += skip;
945  if (i >= s->num_bands) {
947  "invalid scale factor coding\n");
948  return AVERROR_INVALIDDATA;
949  }
950  s->channel[c].scale_factors[i] += (val ^ sign) - sign;
951  }
952  }
955  s->channel[c].table_idx = s->table_idx;
956  s->channel[c].reuse_sf = 1;
957  }
958 
961  for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
962  s->channel[c].max_scale_factor =
963  FFMAX(s->channel[c].max_scale_factor, *sf);
964  }
965 
966  }
967  return 0;
968 }
969 
975 {
976  int i;
977 
978  for (i = 0; i < s->num_chgroups; i++) {
979  if (s->chgroup[i].transform) {
980  float data[WMAPRO_MAX_CHANNELS];
981  const int num_channels = s->chgroup[i].num_channels;
982  float** ch_data = s->chgroup[i].channel_data;
983  float** ch_end = ch_data + num_channels;
984  const int8_t* tb = s->chgroup[i].transform_band;
985  int16_t* sfb;
986 
988  for (sfb = s->cur_sfb_offsets;
989  sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
990  int y;
991  if (*tb++ == 1) {
993  for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
994  const float* mat = s->chgroup[i].decorrelation_matrix;
995  const float* data_end = data + num_channels;
996  float* data_ptr = data;
997  float** ch;
998 
999  for (ch = ch_data; ch < ch_end; ch++)
1000  *data_ptr++ = (*ch)[y];
1001 
1002  for (ch = ch_data; ch < ch_end; ch++) {
1003  float sum = 0;
1004  data_ptr = data;
1005  while (data_ptr < data_end)
1006  sum += *data_ptr++ * *mat++;
1007 
1008  (*ch)[y] = sum;
1009  }
1010  }
1011  } else if (s->num_channels == 2) {
1012  int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
1013  s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0],
1014  ch_data[0] + sfb[0],
1015  181.0 / 128, len);
1016  s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0],
1017  ch_data[1] + sfb[0],
1018  181.0 / 128, len);
1019  }
1020  }
1021  }
1022  }
1023 }
1024 
1030 {
1031  int i;
1032  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1033  int c = s->channel_indexes_for_cur_subframe[i];
1034  float* window;
1035  int winlen = s->channel[c].prev_block_len;
1036  float* start = s->channel[c].coeffs - (winlen >> 1);
1037 
1038  if (s->subframe_len < winlen) {
1039  start += (winlen - s->subframe_len) >> 1;
1040  winlen = s->subframe_len;
1041  }
1042 
1043  window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
1044 
1045  winlen >>= 1;
1046 
1047  s->dsp.vector_fmul_window(start, start, start + winlen,
1048  window, winlen);
1049 
1050  s->channel[c].prev_block_len = s->subframe_len;
1051  }
1052 }
1053 
1060 {
1061  int offset = s->samples_per_frame;
1062  int subframe_len = s->samples_per_frame;
1063  int i;
1064  int total_samples = s->samples_per_frame * s->num_channels;
1065  int transmit_coeffs = 0;
1066  int cur_subwoofer_cutoff;
1067 
1068  s->subframe_offset = get_bits_count(&s->gb);
1069 
1074  for (i = 0; i < s->num_channels; i++) {
1075  s->channel[i].grouped = 0;
1076  if (offset > s->channel[i].decoded_samples) {
1077  offset = s->channel[i].decoded_samples;
1078  subframe_len =
1080  }
1081  }
1082 
1083  av_dlog(s->avctx,
1084  "processing subframe with offset %i len %i\n", offset, subframe_len);
1085 
1088  for (i = 0; i < s->num_channels; i++) {
1089  const int cur_subframe = s->channel[i].cur_subframe;
1091  total_samples -= s->channel[i].decoded_samples;
1092 
1094  if (offset == s->channel[i].decoded_samples &&
1095  subframe_len == s->channel[i].subframe_len[cur_subframe]) {
1096  total_samples -= s->channel[i].subframe_len[cur_subframe];
1097  s->channel[i].decoded_samples +=
1098  s->channel[i].subframe_len[cur_subframe];
1101  }
1102  }
1103 
1106  if (!total_samples)
1107  s->parsed_all_subframes = 1;
1108 
1109 
1110  av_dlog(s->avctx, "subframe is part of %i channels\n",
1112 
1114  s->table_idx = av_log2(s->samples_per_frame/subframe_len);
1115  s->num_bands = s->num_sfb[s->table_idx];
1117  cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
1118 
1120  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1121  int c = s->channel_indexes_for_cur_subframe[i];
1122 
1123  s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1)
1124  + offset];
1125  }
1126 
1127  s->subframe_len = subframe_len;
1128  s->esc_len = av_log2(s->subframe_len - 1) + 1;
1129 
1131  if (get_bits1(&s->gb)) {
1132  int num_fill_bits;
1133  if (!(num_fill_bits = get_bits(&s->gb, 2))) {
1134  int len = get_bits(&s->gb, 4);
1135  num_fill_bits = get_bits(&s->gb, len) + 1;
1136  }
1137 
1138  if (num_fill_bits >= 0) {
1139  if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
1140  av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
1141  return AVERROR_INVALIDDATA;
1142  }
1143 
1144  skip_bits_long(&s->gb, num_fill_bits);
1145  }
1146  }
1147 
1149  if (get_bits1(&s->gb)) {
1150  av_log_ask_for_sample(s->avctx, "reserved bit set\n");
1151  return AVERROR_INVALIDDATA;
1152  }
1153 
1154 
1155  if (decode_channel_transform(s) < 0)
1156  return AVERROR_INVALIDDATA;
1157 
1158 
1159  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1160  int c = s->channel_indexes_for_cur_subframe[i];
1161  if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
1162  transmit_coeffs = 1;
1163  }
1164 
1165  if (transmit_coeffs) {
1166  int step;
1167  int quant_step = 90 * s->bits_per_sample >> 4;
1168 
1170  if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
1171  int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
1172  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1173  int c = s->channel_indexes_for_cur_subframe[i];
1174  int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
1175  if (num_vec_coeffs > WMAPRO_BLOCK_MAX_SIZE) {
1176  av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
1177  return AVERROR_INVALIDDATA;
1178  }
1179  s->channel[c].num_vec_coeffs = num_vec_coeffs;
1180  }
1181  } else {
1182  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1183  int c = s->channel_indexes_for_cur_subframe[i];
1184  s->channel[c].num_vec_coeffs = s->subframe_len;
1185  }
1186  }
1188  step = get_sbits(&s->gb, 6);
1189  quant_step += step;
1190  if (step == -32 || step == 31) {
1191  const int sign = (step == 31) - 1;
1192  int quant = 0;
1193  while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
1194  (step = get_bits(&s->gb, 5)) == 31) {
1195  quant += 31;
1196  }
1197  quant_step += ((quant + step) ^ sign) - sign;
1198  }
1199  if (quant_step < 0) {
1200  av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
1201  }
1202 
1205  if (s->channels_for_cur_subframe == 1) {
1206  s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
1207  } else {
1208  int modifier_len = get_bits(&s->gb, 3);
1209  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1210  int c = s->channel_indexes_for_cur_subframe[i];
1211  s->channel[c].quant_step = quant_step;
1212  if (get_bits1(&s->gb)) {
1213  if (modifier_len) {
1214  s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
1215  } else
1216  ++s->channel[c].quant_step;
1217  }
1218  }
1219  }
1220 
1222  if (decode_scale_factors(s) < 0)
1223  return AVERROR_INVALIDDATA;
1224  }
1225 
1226  av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
1227  get_bits_count(&s->gb) - s->subframe_offset);
1228 
1230  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1231  int c = s->channel_indexes_for_cur_subframe[i];
1232  if (s->channel[c].transmit_coefs &&
1233  get_bits_count(&s->gb) < s->num_saved_bits) {
1234  decode_coeffs(s, c);
1235  } else
1236  memset(s->channel[c].coeffs, 0,
1237  sizeof(*s->channel[c].coeffs) * subframe_len);
1238  }
1239 
1240  av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
1241  get_bits_count(&s->gb) - s->subframe_offset);
1242 
1243  if (transmit_coeffs) {
1244  FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
1247  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1248  int c = s->channel_indexes_for_cur_subframe[i];
1249  const int* sf = s->channel[c].scale_factors;
1250  int b;
1251 
1252  if (c == s->lfe_channel)
1253  memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
1254  (subframe_len - cur_subwoofer_cutoff));
1255 
1257  for (b = 0; b < s->num_bands; b++) {
1258  const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
1259  const int exp = s->channel[c].quant_step -
1260  (s->channel[c].max_scale_factor - *sf++) *
1261  s->channel[c].scale_factor_step;
1262  const float quant = pow(10.0, exp / 20.0);
1263  int start = s->cur_sfb_offsets[b];
1264  s->dsp.vector_fmul_scalar(s->tmp + start,
1265  s->channel[c].coeffs + start,
1266  quant, end - start);
1267  }
1268 
1270  mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
1271  }
1272  }
1273 
1275  wmapro_window(s);
1276 
1278  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1279  int c = s->channel_indexes_for_cur_subframe[i];
1280  if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
1281  av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
1282  return AVERROR_INVALIDDATA;
1283  }
1284  ++s->channel[c].cur_subframe;
1285  }
1286 
1287  return 0;
1288 }
1289 
1296 static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
1297 {
1298  AVCodecContext *avctx = s->avctx;
1299  GetBitContext* gb = &s->gb;
1300  int more_frames = 0;
1301  int len = 0;
1302  int i, ret;
1303  const float *out_ptr[WMAPRO_MAX_CHANNELS];
1304  float *samples;
1305 
1307  if (s->len_prefix)
1308  len = get_bits(gb, s->log2_frame_size);
1309 
1310  av_dlog(s->avctx, "decoding frame with length %x\n", len);
1311 
1313  if (decode_tilehdr(s)) {
1314  s->packet_loss = 1;
1315  return 0;
1316  }
1317 
1319  if (s->num_channels > 1 && get_bits1(gb)) {
1320  if (get_bits1(gb)) {
1321  for (i = 0; i < s->num_channels * s->num_channels; i++)
1322  skip_bits(gb, 4);
1323  }
1324  }
1325 
1327  if (s->dynamic_range_compression) {
1328  s->drc_gain = get_bits(gb, 8);
1329  av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
1330  }
1331 
1334  if (get_bits1(gb)) {
1335  int av_unused skip;
1336 
1338  if (get_bits1(gb)) {
1339  skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1340  av_dlog(s->avctx, "start skip: %i\n", skip);
1341  }
1342 
1344  if (get_bits1(gb)) {
1345  skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1346  av_dlog(s->avctx, "end skip: %i\n", skip);
1347  }
1348 
1349  }
1350 
1351  av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
1352  get_bits_count(gb) - s->frame_offset);
1353 
1355  s->parsed_all_subframes = 0;
1356  for (i = 0; i < s->num_channels; i++) {
1357  s->channel[i].decoded_samples = 0;
1358  s->channel[i].cur_subframe = 0;
1359  s->channel[i].reuse_sf = 0;
1360  }
1361 
1363  while (!s->parsed_all_subframes) {
1364  if (decode_subframe(s) < 0) {
1365  s->packet_loss = 1;
1366  return 0;
1367  }
1368  }
1369 
1370  /* get output buffer */
1372  if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
1373  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1374  s->packet_loss = 1;
1375  return 0;
1376  }
1377  samples = (float *)s->frame.data[0];
1378 
1380  for (i = 0; i < s->num_channels; i++)
1381  out_ptr[i] = s->channel[i].out;
1382  s->fmt_conv.float_interleave(samples, out_ptr, s->samples_per_frame,
1383  s->num_channels);
1384 
1385  for (i = 0; i < s->num_channels; i++) {
1387  memcpy(&s->channel[i].out[0],
1388  &s->channel[i].out[s->samples_per_frame],
1389  s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
1390  }
1391 
1392  if (s->skip_frame) {
1393  s->skip_frame = 0;
1394  *got_frame_ptr = 0;
1395  } else {
1396  *got_frame_ptr = 1;
1397  }
1398 
1399  if (s->len_prefix) {
1400  if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
1403  "frame[%i] would have to skip %i bits\n", s->frame_num,
1404  len - (get_bits_count(gb) - s->frame_offset) - 1);
1405  s->packet_loss = 1;
1406  return 0;
1407  }
1408 
1410  skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
1411  } else {
1412  while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
1413  }
1414  }
1415 
1417  more_frames = get_bits1(gb);
1418 
1419  ++s->frame_num;
1420  return more_frames;
1421 }
1422 
1430 {
1431  return s->buf_bit_size - get_bits_count(gb);
1432 }
1433 
1441 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
1442  int append)
1443 {
1444  int buflen;
1445 
1450  if (!append) {
1451  s->frame_offset = get_bits_count(gb) & 7;
1452  s->num_saved_bits = s->frame_offset;
1454  }
1455 
1456  buflen = (s->num_saved_bits + len + 8) >> 3;
1457 
1458  if (len <= 0 || buflen > MAX_FRAMESIZE) {
1459  av_log_ask_for_sample(s->avctx, "input buffer too small\n");
1460  s->packet_loss = 1;
1461  return;
1462  }
1463 
1464  s->num_saved_bits += len;
1465  if (!append) {
1466  avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
1467  s->num_saved_bits);
1468  } else {
1469  int align = 8 - (get_bits_count(gb) & 7);
1470  align = FFMIN(align, len);
1471  put_bits(&s->pb, align, get_bits(gb, align));
1472  len -= align;
1473  avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
1474  }
1475  skip_bits_long(gb, len);
1476 
1477  {
1478  PutBitContext tmp = s->pb;
1479  flush_put_bits(&tmp);
1480  }
1481 
1483  skip_bits(&s->gb, s->frame_offset);
1484 }
1485 
1494 static int decode_packet(AVCodecContext *avctx, void *data,
1495  int *got_frame_ptr, AVPacket* avpkt)
1496 {
1497  WMAProDecodeCtx *s = avctx->priv_data;
1498  GetBitContext* gb = &s->pgb;
1499  const uint8_t* buf = avpkt->data;
1500  int buf_size = avpkt->size;
1501  int num_bits_prev_frame;
1502  int packet_sequence_number;
1503 
1504  *got_frame_ptr = 0;
1505 
1506  if (s->packet_done || s->packet_loss) {
1507  s->packet_done = 0;
1508 
1510  if (buf_size < avctx->block_align)
1511  return 0;
1512 
1513  s->next_packet_start = buf_size - avctx->block_align;
1514  buf_size = avctx->block_align;
1515  s->buf_bit_size = buf_size << 3;
1516 
1518  init_get_bits(gb, buf, s->buf_bit_size);
1519  packet_sequence_number = get_bits(gb, 4);
1520  skip_bits(gb, 2);
1521 
1523  num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
1524  av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
1525  num_bits_prev_frame);
1526 
1528  if (!s->packet_loss &&
1529  ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
1530  s->packet_loss = 1;
1531  av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
1532  s->packet_sequence_number, packet_sequence_number);
1533  }
1534  s->packet_sequence_number = packet_sequence_number;
1535 
1536  if (num_bits_prev_frame > 0) {
1537  int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
1538  if (num_bits_prev_frame >= remaining_packet_bits) {
1539  num_bits_prev_frame = remaining_packet_bits;
1540  s->packet_done = 1;
1541  }
1542 
1545  save_bits(s, gb, num_bits_prev_frame, 1);
1546  av_dlog(avctx, "accumulated %x bits of frame data\n",
1547  s->num_saved_bits - s->frame_offset);
1548 
1550  if (!s->packet_loss)
1551  decode_frame(s, got_frame_ptr);
1552  } else if (s->num_saved_bits - s->frame_offset) {
1553  av_dlog(avctx, "ignoring %x previously saved bits\n",
1554  s->num_saved_bits - s->frame_offset);
1555  }
1556 
1557  if (s->packet_loss) {
1561  s->num_saved_bits = 0;
1562  s->packet_loss = 0;
1563  }
1564 
1565  } else {
1566  int frame_size;
1567  s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
1568  init_get_bits(gb, avpkt->data, s->buf_bit_size);
1569  skip_bits(gb, s->packet_offset);
1570  if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
1571  (frame_size = show_bits(gb, s->log2_frame_size)) &&
1572  frame_size <= remaining_bits(s, gb)) {
1573  save_bits(s, gb, frame_size, 0);
1574  s->packet_done = !decode_frame(s, got_frame_ptr);
1575  } else if (!s->len_prefix
1576  && s->num_saved_bits > get_bits_count(&s->gb)) {
1584  s->packet_done = !decode_frame(s, got_frame_ptr);
1585  } else
1586  s->packet_done = 1;
1587  }
1588 
1589  if (s->packet_done && !s->packet_loss &&
1590  remaining_bits(s, gb) > 0) {
1593  save_bits(s, gb, remaining_bits(s, gb), 0);
1594  }
1595 
1596  s->packet_offset = get_bits_count(gb) & 7;
1597  if (s->packet_loss)
1598  return AVERROR_INVALIDDATA;
1599 
1600  if (*got_frame_ptr)
1601  *(AVFrame *)data = s->frame;
1602 
1603  return get_bits_count(gb) >> 3;
1604 }
1605 
1610 static void flush(AVCodecContext *avctx)
1611 {
1612  WMAProDecodeCtx *s = avctx->priv_data;
1613  int i;
1616  for (i = 0; i < s->num_channels; i++)
1617  memset(s->channel[i].out, 0, s->samples_per_frame *
1618  sizeof(*s->channel[i].out));
1619  s->packet_loss = 1;
1620 }
1621 
1622 
1627  .name = "wmapro",
1628  .type = AVMEDIA_TYPE_AUDIO,
1629  .id = CODEC_ID_WMAPRO,
1630  .priv_data_size = sizeof(WMAProDecodeCtx),
1631  .init = decode_init,
1632  .close = decode_end,
1633  .decode = decode_packet,
1634  .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
1635  .flush= flush,
1636  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
1637 };