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  if (!avctx->block_align) {
284  av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
285  return AVERROR(EINVAL);
286  }
287 
288  s->avctx = avctx;
289  dsputil_init(&s->dsp, avctx);
290  ff_fmt_convert_init(&s->fmt_conv, avctx);
292 
293  avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
294 
295  if (avctx->extradata_size >= 18) {
296  s->decode_flags = AV_RL16(edata_ptr+14);
297  channel_mask = AV_RL32(edata_ptr+2);
298  s->bits_per_sample = AV_RL16(edata_ptr);
300  for (i = 0; i < avctx->extradata_size; i++)
301  av_dlog(avctx, "[%x] ", avctx->extradata[i]);
302  av_dlog(avctx, "\n");
303 
304  } else {
305  av_log_ask_for_sample(avctx, "Unknown extradata size\n");
306  return AVERROR_INVALIDDATA;
307  }
308 
310  s->log2_frame_size = av_log2(avctx->block_align) + 4;
311 
313  s->skip_frame = 1; /* skip first frame */
314  s->packet_loss = 1;
315  s->len_prefix = (s->decode_flags & 0x40);
316 
319  3, s->decode_flags);
320 
322  log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
323  s->max_num_subframes = 1 << log2_max_num_subframes;
324  if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
325  s->max_subframe_len_bit = 1;
326  s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
327 
328  num_possible_block_sizes = log2_max_num_subframes + 1;
330  s->dynamic_range_compression = (s->decode_flags & 0x80);
331 
332  if (s->max_num_subframes > MAX_SUBFRAMES) {
333  av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n",
334  s->max_num_subframes);
335  return AVERROR_INVALIDDATA;
336  }
337 
338  if (s->avctx->sample_rate <= 0) {
339  av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
340  return AVERROR_INVALIDDATA;
341  }
342 
343  s->num_channels = avctx->channels;
344 
345  if (s->num_channels < 0) {
346  av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
347  return AVERROR_INVALIDDATA;
348  } else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
349  av_log_ask_for_sample(avctx, "unsupported number of channels\n");
350  return AVERROR_PATCHWELCOME;
351  }
352 
354  for (i = 0; i < s->num_channels; i++)
356 
358  s->lfe_channel = -1;
359 
360  if (channel_mask & 8) {
361  unsigned int mask;
362  for (mask = 1; mask < 16; mask <<= 1) {
363  if (channel_mask & mask)
364  ++s->lfe_channel;
365  }
366  }
367 
369  scale_huffbits, 1, 1,
370  scale_huffcodes, 2, 2, 616);
371 
373  scale_rl_huffbits, 1, 1,
374  scale_rl_huffcodes, 4, 4, 1406);
375 
376  INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
377  coef0_huffbits, 1, 1,
378  coef0_huffcodes, 4, 4, 2108);
379 
380  INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
381  coef1_huffbits, 1, 1,
382  coef1_huffcodes, 4, 4, 3912);
383 
385  vec4_huffbits, 1, 1,
386  vec4_huffcodes, 2, 2, 604);
387 
389  vec2_huffbits, 1, 1,
390  vec2_huffcodes, 2, 2, 562);
391 
393  vec1_huffbits, 1, 1,
394  vec1_huffcodes, 2, 2, 562);
395 
398  for (i = 0; i < num_possible_block_sizes; i++) {
399  int subframe_len = s->samples_per_frame >> i;
400  int x;
401  int band = 1;
402 
403  s->sfb_offsets[i][0] = 0;
404 
405  for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
406  int offset = (subframe_len * 2 * critical_freq[x])
407  / s->avctx->sample_rate + 2;
408  offset &= ~3;
409  if (offset > s->sfb_offsets[i][band - 1])
410  s->sfb_offsets[i][band++] = offset;
411  }
412  s->sfb_offsets[i][band - 1] = subframe_len;
413  s->num_sfb[i] = band - 1;
414  }
415 
416 
422  for (i = 0; i < num_possible_block_sizes; i++) {
423  int b;
424  for (b = 0; b < s->num_sfb[i]; b++) {
425  int x;
426  int offset = ((s->sfb_offsets[i][b]
427  + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
428  for (x = 0; x < num_possible_block_sizes; x++) {
429  int v = 0;
430  while (s->sfb_offsets[x][v + 1] << x < offset)
431  ++v;
432  s->sf_offsets[i][x][b] = v;
433  }
434  }
435  }
436 
438  for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
440  1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
441  / (1 << (s->bits_per_sample - 1)));
442 
444  for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
445  const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
446  ff_init_ff_sine_windows(win_idx);
447  s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
448  }
449 
451  for (i = 0; i < num_possible_block_sizes; i++) {
452  int block_size = s->samples_per_frame >> i;
453  int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
454  / s->avctx->sample_rate;
455  s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
456  }
457 
459  for (i = 0; i < 33; i++)
460  sin64[i] = sin(i*M_PI / 64.0);
461 
462  if (avctx->debug & FF_DEBUG_BITSTREAM)
463  dump_context(s);
464 
465  avctx->channel_layout = channel_mask;
466 
468  avctx->coded_frame = &s->frame;
469 
470  return 0;
471 }
472 
479 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
480 {
481  int frame_len_shift = 0;
482  int subframe_len;
483 
485  if (offset == s->samples_per_frame - s->min_samples_per_subframe)
486  return s->min_samples_per_subframe;
487 
489  if (s->max_subframe_len_bit) {
490  if (get_bits1(&s->gb))
491  frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
492  } else
493  frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
494 
495  subframe_len = s->samples_per_frame >> frame_len_shift;
496 
498  if (subframe_len < s->min_samples_per_subframe ||
499  subframe_len > s->samples_per_frame) {
500  av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
501  subframe_len);
502  return AVERROR_INVALIDDATA;
503  }
504  return subframe_len;
505 }
506 
528 {
529  uint16_t num_samples[WMAPRO_MAX_CHANNELS];
530  uint8_t contains_subframe[WMAPRO_MAX_CHANNELS];
531  int channels_for_cur_subframe = s->num_channels;
532  int fixed_channel_layout = 0;
533  int min_channel_len = 0;
534  int c;
535 
536  /* Should never consume more than 3073 bits (256 iterations for the
537  * while loop when always the minimum amount of 128 samples is substracted
538  * from missing samples in the 8 channel case).
539  * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4)
540  */
541 
543  for (c = 0; c < s->num_channels; c++)
544  s->channel[c].num_subframes = 0;
545 
546  memset(num_samples, 0, sizeof(num_samples));
547 
548  if (s->max_num_subframes == 1 || get_bits1(&s->gb))
549  fixed_channel_layout = 1;
550 
552  do {
553  int subframe_len;
554 
556  for (c = 0; c < s->num_channels; c++) {
557  if (num_samples[c] == min_channel_len) {
558  if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
559  (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
560  contains_subframe[c] = 1;
561  else
562  contains_subframe[c] = get_bits1(&s->gb);
563  } else
564  contains_subframe[c] = 0;
565  }
566 
568  if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
569  return AVERROR_INVALIDDATA;
570 
572  min_channel_len += subframe_len;
573  for (c = 0; c < s->num_channels; c++) {
574  WMAProChannelCtx* chan = &s->channel[c];
575 
576  if (contains_subframe[c]) {
577  if (chan->num_subframes >= MAX_SUBFRAMES) {
579  "broken frame: num subframes > 31\n");
580  return AVERROR_INVALIDDATA;
581  }
582  chan->subframe_len[chan->num_subframes] = subframe_len;
583  num_samples[c] += subframe_len;
584  ++chan->num_subframes;
585  if (num_samples[c] > s->samples_per_frame) {
586  av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
587  "channel len > samples_per_frame\n");
588  return AVERROR_INVALIDDATA;
589  }
590  } else if (num_samples[c] <= min_channel_len) {
591  if (num_samples[c] < min_channel_len) {
592  channels_for_cur_subframe = 0;
593  min_channel_len = num_samples[c];
594  }
595  ++channels_for_cur_subframe;
596  }
597  }
598  } while (min_channel_len < s->samples_per_frame);
599 
600  for (c = 0; c < s->num_channels; c++) {
601  int i;
602  int offset = 0;
603  for (i = 0; i < s->channel[c].num_subframes; i++) {
604  av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
605  " len %i\n", s->frame_num, c, i,
606  s->channel[c].subframe_len[i]);
607  s->channel[c].subframe_offset[i] = offset;
608  offset += s->channel[c].subframe_len[i];
609  }
610  }
611 
612  return 0;
613 }
614 
621  WMAProChannelGrp *chgroup)
622 {
623  int i;
624  int offset = 0;
625  int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
626  memset(chgroup->decorrelation_matrix, 0, s->num_channels *
627  s->num_channels * sizeof(*chgroup->decorrelation_matrix));
628 
629  for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
630  rotation_offset[i] = get_bits(&s->gb, 6);
631 
632  for (i = 0; i < chgroup->num_channels; i++)
633  chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
634  get_bits1(&s->gb) ? 1.0 : -1.0;
635 
636  for (i = 1; i < chgroup->num_channels; i++) {
637  int x;
638  for (x = 0; x < i; x++) {
639  int y;
640  for (y = 0; y < i + 1; y++) {
641  float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
642  float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
643  int n = rotation_offset[offset + x];
644  float sinv;
645  float cosv;
646 
647  if (n < 32) {
648  sinv = sin64[n];
649  cosv = sin64[32 - n];
650  } else {
651  sinv = sin64[64 - n];
652  cosv = -sin64[n - 32];
653  }
654 
655  chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
656  (v1 * sinv) - (v2 * cosv);
657  chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
658  (v1 * cosv) + (v2 * sinv);
659  }
660  }
661  offset += i;
662  }
663 }
664 
671 {
672  int i;
673  /* should never consume more than 1921 bits for the 8 channel case
674  * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS
675  * + MAX_CHANNELS + MAX_BANDS + 1)
676  */
677 
679  s->num_chgroups = 0;
680  if (s->num_channels > 1) {
681  int remaining_channels = s->channels_for_cur_subframe;
682 
683  if (get_bits1(&s->gb)) {
685  "unsupported channel transform bit\n");
686  return AVERROR_INVALIDDATA;
687  }
688 
689  for (s->num_chgroups = 0; remaining_channels &&
691  WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
692  float** channel_data = chgroup->channel_data;
693  chgroup->num_channels = 0;
694  chgroup->transform = 0;
695 
697  if (remaining_channels > 2) {
698  for (i = 0; i < s->channels_for_cur_subframe; i++) {
699  int channel_idx = s->channel_indexes_for_cur_subframe[i];
700  if (!s->channel[channel_idx].grouped
701  && get_bits1(&s->gb)) {
702  ++chgroup->num_channels;
703  s->channel[channel_idx].grouped = 1;
704  *channel_data++ = s->channel[channel_idx].coeffs;
705  }
706  }
707  } else {
708  chgroup->num_channels = remaining_channels;
709  for (i = 0; i < s->channels_for_cur_subframe; i++) {
710  int channel_idx = s->channel_indexes_for_cur_subframe[i];
711  if (!s->channel[channel_idx].grouped)
712  *channel_data++ = s->channel[channel_idx].coeffs;
713  s->channel[channel_idx].grouped = 1;
714  }
715  }
716 
718  if (chgroup->num_channels == 2) {
719  if (get_bits1(&s->gb)) {
720  if (get_bits1(&s->gb)) {
722  "unsupported channel transform type\n");
723  }
724  } else {
725  chgroup->transform = 1;
726  if (s->num_channels == 2) {
727  chgroup->decorrelation_matrix[0] = 1.0;
728  chgroup->decorrelation_matrix[1] = -1.0;
729  chgroup->decorrelation_matrix[2] = 1.0;
730  chgroup->decorrelation_matrix[3] = 1.0;
731  } else {
733  chgroup->decorrelation_matrix[0] = 0.70703125;
734  chgroup->decorrelation_matrix[1] = -0.70703125;
735  chgroup->decorrelation_matrix[2] = 0.70703125;
736  chgroup->decorrelation_matrix[3] = 0.70703125;
737  }
738  }
739  } else if (chgroup->num_channels > 2) {
740  if (get_bits1(&s->gb)) {
741  chgroup->transform = 1;
742  if (get_bits1(&s->gb)) {
743  decode_decorrelation_matrix(s, chgroup);
744  } else {
746  if (chgroup->num_channels > 6) {
748  "coupled channels > 6\n");
749  } else {
750  memcpy(chgroup->decorrelation_matrix,
752  chgroup->num_channels * chgroup->num_channels *
753  sizeof(*chgroup->decorrelation_matrix));
754  }
755  }
756  }
757  }
758 
760  if (chgroup->transform) {
761  if (!get_bits1(&s->gb)) {
762  int i;
764  for (i = 0; i < s->num_bands; i++) {
765  chgroup->transform_band[i] = get_bits1(&s->gb);
766  }
767  } else {
768  memset(chgroup->transform_band, 1, s->num_bands);
769  }
770  }
771  remaining_channels -= chgroup->num_channels;
772  }
773  }
774  return 0;
775 }
776 
783 static int decode_coeffs(WMAProDecodeCtx *s, int c)
784 {
785  /* Integers 0..15 as single-precision floats. The table saves a
786  costly int to float conversion, and storing the values as
787  integers allows fast sign-flipping. */
788  static const uint32_t fval_tab[16] = {
789  0x00000000, 0x3f800000, 0x40000000, 0x40400000,
790  0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
791  0x41000000, 0x41100000, 0x41200000, 0x41300000,
792  0x41400000, 0x41500000, 0x41600000, 0x41700000,
793  };
794  int vlctable;
795  VLC* vlc;
796  WMAProChannelCtx* ci = &s->channel[c];
797  int rl_mode = 0;
798  int cur_coeff = 0;
799  int num_zeros = 0;
800  const uint16_t* run;
801  const float* level;
802 
803  av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
804 
805  vlctable = get_bits1(&s->gb);
806  vlc = &coef_vlc[vlctable];
807 
808  if (vlctable) {
809  run = coef1_run;
810  level = coef1_level;
811  } else {
812  run = coef0_run;
813  level = coef0_level;
814  }
815 
818  while ((s->transmit_num_vec_coeffs || !rl_mode) &&
819  (cur_coeff + 3 < ci->num_vec_coeffs)) {
820  uint32_t vals[4];
821  int i;
822  unsigned int idx;
823 
824  idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
825 
826  if (idx == HUFF_VEC4_SIZE - 1) {
827  for (i = 0; i < 4; i += 2) {
828  idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
829  if (idx == HUFF_VEC2_SIZE - 1) {
830  uint32_t v0, v1;
831  v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
832  if (v0 == HUFF_VEC1_SIZE - 1)
833  v0 += ff_wma_get_large_val(&s->gb);
834  v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
835  if (v1 == HUFF_VEC1_SIZE - 1)
836  v1 += ff_wma_get_large_val(&s->gb);
837  vals[i ] = av_float2int(v0);
838  vals[i+1] = av_float2int(v1);
839  } else {
840  vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
841  vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
842  }
843  }
844  } else {
845  vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
846  vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
847  vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
848  vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
849  }
850 
852  for (i = 0; i < 4; i++) {
853  if (vals[i]) {
854  uint32_t sign = get_bits1(&s->gb) - 1;
855  AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
856  num_zeros = 0;
857  } else {
858  ci->coeffs[cur_coeff] = 0;
861  rl_mode |= (++num_zeros > s->subframe_len >> 8);
862  }
863  ++cur_coeff;
864  }
865  }
866 
868  if (cur_coeff < s->subframe_len) {
869  memset(&ci->coeffs[cur_coeff], 0,
870  sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
871  if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
872  level, run, 1, ci->coeffs,
873  cur_coeff, s->subframe_len,
874  s->subframe_len, s->esc_len, 0))
875  return AVERROR_INVALIDDATA;
876  }
877 
878  return 0;
879 }
880 
887 {
888  int i;
889 
894  for (i = 0; i < s->channels_for_cur_subframe; i++) {
895  int c = s->channel_indexes_for_cur_subframe[i];
896  int* sf;
897  int* sf_end;
899  sf_end = s->channel[c].scale_factors + s->num_bands;
900 
906  if (s->channel[c].reuse_sf) {
907  const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
908  int b;
909  for (b = 0; b < s->num_bands; b++)
910  s->channel[c].scale_factors[b] =
911  s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
912  }
913 
914  if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
915 
916  if (!s->channel[c].reuse_sf) {
917  int val;
919  s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
920  val = 45 / s->channel[c].scale_factor_step;
921  for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
922  val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
923  *sf = val;
924  }
925  } else {
926  int i;
928  for (i = 0; i < s->num_bands; i++) {
929  int idx;
930  int skip;
931  int val;
932  int sign;
933 
934  idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
935 
936  if (!idx) {
937  uint32_t code = get_bits(&s->gb, 14);
938  val = code >> 6;
939  sign = (code & 1) - 1;
940  skip = (code & 0x3f) >> 1;
941  } else if (idx == 1) {
942  break;
943  } else {
944  skip = scale_rl_run[idx];
945  val = scale_rl_level[idx];
946  sign = get_bits1(&s->gb)-1;
947  }
948 
949  i += skip;
950  if (i >= s->num_bands) {
952  "invalid scale factor coding\n");
953  return AVERROR_INVALIDDATA;
954  }
955  s->channel[c].scale_factors[i] += (val ^ sign) - sign;
956  }
957  }
960  s->channel[c].table_idx = s->table_idx;
961  s->channel[c].reuse_sf = 1;
962  }
963 
966  for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
967  s->channel[c].max_scale_factor =
968  FFMAX(s->channel[c].max_scale_factor, *sf);
969  }
970 
971  }
972  return 0;
973 }
974 
980 {
981  int i;
982 
983  for (i = 0; i < s->num_chgroups; i++) {
984  if (s->chgroup[i].transform) {
985  float data[WMAPRO_MAX_CHANNELS];
986  const int num_channels = s->chgroup[i].num_channels;
987  float** ch_data = s->chgroup[i].channel_data;
988  float** ch_end = ch_data + num_channels;
989  const int8_t* tb = s->chgroup[i].transform_band;
990  int16_t* sfb;
991 
993  for (sfb = s->cur_sfb_offsets;
994  sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
995  int y;
996  if (*tb++ == 1) {
998  for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
999  const float* mat = s->chgroup[i].decorrelation_matrix;
1000  const float* data_end = data + num_channels;
1001  float* data_ptr = data;
1002  float** ch;
1003 
1004  for (ch = ch_data; ch < ch_end; ch++)
1005  *data_ptr++ = (*ch)[y];
1006 
1007  for (ch = ch_data; ch < ch_end; ch++) {
1008  float sum = 0;
1009  data_ptr = data;
1010  while (data_ptr < data_end)
1011  sum += *data_ptr++ * *mat++;
1012 
1013  (*ch)[y] = sum;
1014  }
1015  }
1016  } else if (s->num_channels == 2) {
1017  int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
1018  s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0],
1019  ch_data[0] + sfb[0],
1020  181.0 / 128, len);
1021  s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0],
1022  ch_data[1] + sfb[0],
1023  181.0 / 128, len);
1024  }
1025  }
1026  }
1027  }
1028 }
1029 
1035 {
1036  int i;
1037  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1038  int c = s->channel_indexes_for_cur_subframe[i];
1039  float* window;
1040  int winlen = s->channel[c].prev_block_len;
1041  float* start = s->channel[c].coeffs - (winlen >> 1);
1042 
1043  if (s->subframe_len < winlen) {
1044  start += (winlen - s->subframe_len) >> 1;
1045  winlen = s->subframe_len;
1046  }
1047 
1048  window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
1049 
1050  winlen >>= 1;
1051 
1052  s->dsp.vector_fmul_window(start, start, start + winlen,
1053  window, winlen);
1054 
1055  s->channel[c].prev_block_len = s->subframe_len;
1056  }
1057 }
1058 
1065 {
1066  int offset = s->samples_per_frame;
1067  int subframe_len = s->samples_per_frame;
1068  int i;
1069  int total_samples = s->samples_per_frame * s->num_channels;
1070  int transmit_coeffs = 0;
1071  int cur_subwoofer_cutoff;
1072 
1073  s->subframe_offset = get_bits_count(&s->gb);
1074 
1079  for (i = 0; i < s->num_channels; i++) {
1080  s->channel[i].grouped = 0;
1081  if (offset > s->channel[i].decoded_samples) {
1082  offset = s->channel[i].decoded_samples;
1083  subframe_len =
1085  }
1086  }
1087 
1088  av_dlog(s->avctx,
1089  "processing subframe with offset %i len %i\n", offset, subframe_len);
1090 
1093  for (i = 0; i < s->num_channels; i++) {
1094  const int cur_subframe = s->channel[i].cur_subframe;
1096  total_samples -= s->channel[i].decoded_samples;
1097 
1099  if (offset == s->channel[i].decoded_samples &&
1100  subframe_len == s->channel[i].subframe_len[cur_subframe]) {
1101  total_samples -= s->channel[i].subframe_len[cur_subframe];
1102  s->channel[i].decoded_samples +=
1103  s->channel[i].subframe_len[cur_subframe];
1106  }
1107  }
1108 
1111  if (!total_samples)
1112  s->parsed_all_subframes = 1;
1113 
1114 
1115  av_dlog(s->avctx, "subframe is part of %i channels\n",
1117 
1119  s->table_idx = av_log2(s->samples_per_frame/subframe_len);
1120  s->num_bands = s->num_sfb[s->table_idx];
1122  cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
1123 
1125  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1126  int c = s->channel_indexes_for_cur_subframe[i];
1127 
1128  s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1)
1129  + offset];
1130  }
1131 
1132  s->subframe_len = subframe_len;
1133  s->esc_len = av_log2(s->subframe_len - 1) + 1;
1134 
1136  if (get_bits1(&s->gb)) {
1137  int num_fill_bits;
1138  if (!(num_fill_bits = get_bits(&s->gb, 2))) {
1139  int len = get_bits(&s->gb, 4);
1140  num_fill_bits = get_bits(&s->gb, len) + 1;
1141  }
1142 
1143  if (num_fill_bits >= 0) {
1144  if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
1145  av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
1146  return AVERROR_INVALIDDATA;
1147  }
1148 
1149  skip_bits_long(&s->gb, num_fill_bits);
1150  }
1151  }
1152 
1154  if (get_bits1(&s->gb)) {
1155  av_log_ask_for_sample(s->avctx, "reserved bit set\n");
1156  return AVERROR_INVALIDDATA;
1157  }
1158 
1159 
1160  if (decode_channel_transform(s) < 0)
1161  return AVERROR_INVALIDDATA;
1162 
1163 
1164  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1165  int c = s->channel_indexes_for_cur_subframe[i];
1166  if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
1167  transmit_coeffs = 1;
1168  }
1169 
1170  if (transmit_coeffs) {
1171  int step;
1172  int quant_step = 90 * s->bits_per_sample >> 4;
1173 
1175  if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
1176  int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
1177  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1178  int c = s->channel_indexes_for_cur_subframe[i];
1179  int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
1180  if (num_vec_coeffs > WMAPRO_BLOCK_MAX_SIZE) {
1181  av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
1182  return AVERROR_INVALIDDATA;
1183  }
1184  s->channel[c].num_vec_coeffs = num_vec_coeffs;
1185  }
1186  } else {
1187  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1188  int c = s->channel_indexes_for_cur_subframe[i];
1189  s->channel[c].num_vec_coeffs = s->subframe_len;
1190  }
1191  }
1193  step = get_sbits(&s->gb, 6);
1194  quant_step += step;
1195  if (step == -32 || step == 31) {
1196  const int sign = (step == 31) - 1;
1197  int quant = 0;
1198  while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
1199  (step = get_bits(&s->gb, 5)) == 31) {
1200  quant += 31;
1201  }
1202  quant_step += ((quant + step) ^ sign) - sign;
1203  }
1204  if (quant_step < 0) {
1205  av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
1206  }
1207 
1210  if (s->channels_for_cur_subframe == 1) {
1211  s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
1212  } else {
1213  int modifier_len = get_bits(&s->gb, 3);
1214  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1215  int c = s->channel_indexes_for_cur_subframe[i];
1216  s->channel[c].quant_step = quant_step;
1217  if (get_bits1(&s->gb)) {
1218  if (modifier_len) {
1219  s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
1220  } else
1221  ++s->channel[c].quant_step;
1222  }
1223  }
1224  }
1225 
1227  if (decode_scale_factors(s) < 0)
1228  return AVERROR_INVALIDDATA;
1229  }
1230 
1231  av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
1232  get_bits_count(&s->gb) - s->subframe_offset);
1233 
1235  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1236  int c = s->channel_indexes_for_cur_subframe[i];
1237  if (s->channel[c].transmit_coefs &&
1238  get_bits_count(&s->gb) < s->num_saved_bits) {
1239  decode_coeffs(s, c);
1240  } else
1241  memset(s->channel[c].coeffs, 0,
1242  sizeof(*s->channel[c].coeffs) * subframe_len);
1243  }
1244 
1245  av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
1246  get_bits_count(&s->gb) - s->subframe_offset);
1247 
1248  if (transmit_coeffs) {
1249  FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
1252  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1253  int c = s->channel_indexes_for_cur_subframe[i];
1254  const int* sf = s->channel[c].scale_factors;
1255  int b;
1256 
1257  if (c == s->lfe_channel)
1258  memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
1259  (subframe_len - cur_subwoofer_cutoff));
1260 
1262  for (b = 0; b < s->num_bands; b++) {
1263  const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
1264  const int exp = s->channel[c].quant_step -
1265  (s->channel[c].max_scale_factor - *sf++) *
1266  s->channel[c].scale_factor_step;
1267  const float quant = pow(10.0, exp / 20.0);
1268  int start = s->cur_sfb_offsets[b];
1269  s->dsp.vector_fmul_scalar(s->tmp + start,
1270  s->channel[c].coeffs + start,
1271  quant, end - start);
1272  }
1273 
1275  mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
1276  }
1277  }
1278 
1280  wmapro_window(s);
1281 
1283  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1284  int c = s->channel_indexes_for_cur_subframe[i];
1285  if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
1286  av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
1287  return AVERROR_INVALIDDATA;
1288  }
1289  ++s->channel[c].cur_subframe;
1290  }
1291 
1292  return 0;
1293 }
1294 
1301 static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
1302 {
1303  AVCodecContext *avctx = s->avctx;
1304  GetBitContext* gb = &s->gb;
1305  int more_frames = 0;
1306  int len = 0;
1307  int i, ret;
1308  const float *out_ptr[WMAPRO_MAX_CHANNELS];
1309  float *samples;
1310 
1312  if (s->len_prefix)
1313  len = get_bits(gb, s->log2_frame_size);
1314 
1315  av_dlog(s->avctx, "decoding frame with length %x\n", len);
1316 
1318  if (decode_tilehdr(s)) {
1319  s->packet_loss = 1;
1320  return 0;
1321  }
1322 
1324  if (s->num_channels > 1 && get_bits1(gb)) {
1325  if (get_bits1(gb)) {
1326  for (i = 0; i < s->num_channels * s->num_channels; i++)
1327  skip_bits(gb, 4);
1328  }
1329  }
1330 
1332  if (s->dynamic_range_compression) {
1333  s->drc_gain = get_bits(gb, 8);
1334  av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
1335  }
1336 
1339  if (get_bits1(gb)) {
1340  int av_unused skip;
1341 
1343  if (get_bits1(gb)) {
1344  skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1345  av_dlog(s->avctx, "start skip: %i\n", skip);
1346  }
1347 
1349  if (get_bits1(gb)) {
1350  skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1351  av_dlog(s->avctx, "end skip: %i\n", skip);
1352  }
1353 
1354  }
1355 
1356  av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
1357  get_bits_count(gb) - s->frame_offset);
1358 
1360  s->parsed_all_subframes = 0;
1361  for (i = 0; i < s->num_channels; i++) {
1362  s->channel[i].decoded_samples = 0;
1363  s->channel[i].cur_subframe = 0;
1364  s->channel[i].reuse_sf = 0;
1365  }
1366 
1368  while (!s->parsed_all_subframes) {
1369  if (decode_subframe(s) < 0) {
1370  s->packet_loss = 1;
1371  return 0;
1372  }
1373  }
1374 
1375  /* get output buffer */
1377  if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
1378  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1379  s->packet_loss = 1;
1380  return 0;
1381  }
1382  samples = (float *)s->frame.data[0];
1383 
1385  for (i = 0; i < s->num_channels; i++)
1386  out_ptr[i] = s->channel[i].out;
1387  s->fmt_conv.float_interleave(samples, out_ptr, s->samples_per_frame,
1388  s->num_channels);
1389 
1390  for (i = 0; i < s->num_channels; i++) {
1392  memcpy(&s->channel[i].out[0],
1393  &s->channel[i].out[s->samples_per_frame],
1394  s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
1395  }
1396 
1397  if (s->skip_frame) {
1398  s->skip_frame = 0;
1399  *got_frame_ptr = 0;
1400  } else {
1401  *got_frame_ptr = 1;
1402  }
1403 
1404  if (s->len_prefix) {
1405  if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
1408  "frame[%i] would have to skip %i bits\n", s->frame_num,
1409  len - (get_bits_count(gb) - s->frame_offset) - 1);
1410  s->packet_loss = 1;
1411  return 0;
1412  }
1413 
1415  skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
1416  } else {
1417  while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
1418  }
1419  }
1420 
1422  more_frames = get_bits1(gb);
1423 
1424  ++s->frame_num;
1425  return more_frames;
1426 }
1427 
1435 {
1436  return s->buf_bit_size - get_bits_count(gb);
1437 }
1438 
1446 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
1447  int append)
1448 {
1449  int buflen;
1450 
1455  if (!append) {
1456  s->frame_offset = get_bits_count(gb) & 7;
1457  s->num_saved_bits = s->frame_offset;
1459  }
1460 
1461  buflen = (s->num_saved_bits + len + 8) >> 3;
1462 
1463  if (len <= 0 || buflen > MAX_FRAMESIZE) {
1464  av_log_ask_for_sample(s->avctx, "input buffer too small\n");
1465  s->packet_loss = 1;
1466  return;
1467  }
1468 
1469  s->num_saved_bits += len;
1470  if (!append) {
1471  avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
1472  s->num_saved_bits);
1473  } else {
1474  int align = 8 - (get_bits_count(gb) & 7);
1475  align = FFMIN(align, len);
1476  put_bits(&s->pb, align, get_bits(gb, align));
1477  len -= align;
1478  avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
1479  }
1480  skip_bits_long(gb, len);
1481 
1482  {
1483  PutBitContext tmp = s->pb;
1484  flush_put_bits(&tmp);
1485  }
1486 
1488  skip_bits(&s->gb, s->frame_offset);
1489 }
1490 
1499 static int decode_packet(AVCodecContext *avctx, void *data,
1500  int *got_frame_ptr, AVPacket* avpkt)
1501 {
1502  WMAProDecodeCtx *s = avctx->priv_data;
1503  GetBitContext* gb = &s->pgb;
1504  const uint8_t* buf = avpkt->data;
1505  int buf_size = avpkt->size;
1506  int num_bits_prev_frame;
1507  int packet_sequence_number;
1508 
1509  *got_frame_ptr = 0;
1510 
1511  if (s->packet_done || s->packet_loss) {
1512  s->packet_done = 0;
1513 
1515  if (buf_size < avctx->block_align) {
1516  av_log(avctx, AV_LOG_ERROR, "Input packet too small (%d < %d)\n",
1517  buf_size, avctx->block_align);
1518  return AVERROR_INVALIDDATA;
1519  }
1520 
1521  s->next_packet_start = buf_size - avctx->block_align;
1522  buf_size = avctx->block_align;
1523  s->buf_bit_size = buf_size << 3;
1524 
1526  init_get_bits(gb, buf, s->buf_bit_size);
1527  packet_sequence_number = get_bits(gb, 4);
1528  skip_bits(gb, 2);
1529 
1531  num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
1532  av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
1533  num_bits_prev_frame);
1534 
1536  if (!s->packet_loss &&
1537  ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
1538  s->packet_loss = 1;
1539  av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
1540  s->packet_sequence_number, packet_sequence_number);
1541  }
1542  s->packet_sequence_number = packet_sequence_number;
1543 
1544  if (num_bits_prev_frame > 0) {
1545  int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
1546  if (num_bits_prev_frame >= remaining_packet_bits) {
1547  num_bits_prev_frame = remaining_packet_bits;
1548  s->packet_done = 1;
1549  }
1550 
1553  save_bits(s, gb, num_bits_prev_frame, 1);
1554  av_dlog(avctx, "accumulated %x bits of frame data\n",
1555  s->num_saved_bits - s->frame_offset);
1556 
1558  if (!s->packet_loss)
1559  decode_frame(s, got_frame_ptr);
1560  } else if (s->num_saved_bits - s->frame_offset) {
1561  av_dlog(avctx, "ignoring %x previously saved bits\n",
1562  s->num_saved_bits - s->frame_offset);
1563  }
1564 
1565  if (s->packet_loss) {
1569  s->num_saved_bits = 0;
1570  s->packet_loss = 0;
1571  }
1572 
1573  } else {
1574  int frame_size;
1575  s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
1576  init_get_bits(gb, avpkt->data, s->buf_bit_size);
1577  skip_bits(gb, s->packet_offset);
1578  if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
1579  (frame_size = show_bits(gb, s->log2_frame_size)) &&
1580  frame_size <= remaining_bits(s, gb)) {
1581  save_bits(s, gb, frame_size, 0);
1582  s->packet_done = !decode_frame(s, got_frame_ptr);
1583  } else if (!s->len_prefix
1584  && s->num_saved_bits > get_bits_count(&s->gb)) {
1592  s->packet_done = !decode_frame(s, got_frame_ptr);
1593  } else
1594  s->packet_done = 1;
1595  }
1596 
1597  if (s->packet_done && !s->packet_loss &&
1598  remaining_bits(s, gb) > 0) {
1601  save_bits(s, gb, remaining_bits(s, gb), 0);
1602  }
1603 
1604  s->packet_offset = get_bits_count(gb) & 7;
1605  if (s->packet_loss)
1606  return AVERROR_INVALIDDATA;
1607 
1608  if (*got_frame_ptr)
1609  *(AVFrame *)data = s->frame;
1610 
1611  return get_bits_count(gb) >> 3;
1612 }
1613 
1618 static void flush(AVCodecContext *avctx)
1619 {
1620  WMAProDecodeCtx *s = avctx->priv_data;
1621  int i;
1624  for (i = 0; i < s->num_channels; i++)
1625  memset(s->channel[i].out, 0, s->samples_per_frame *
1626  sizeof(*s->channel[i].out));
1627  s->packet_loss = 1;
1628 }
1629 
1630 
1635  .name = "wmapro",
1636  .type = AVMEDIA_TYPE_AUDIO,
1637  .id = CODEC_ID_WMAPRO,
1638  .priv_data_size = sizeof(WMAProDecodeCtx),
1639  .init = decode_init,
1640  .close = decode_end,
1641  .decode = decode_packet,
1642  .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
1643  .flush= flush,
1644  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
1645 };