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  s->num_channels = avctx->channels;
334 
335  if (s->num_channels < 0) {
336  av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
337  return AVERROR_INVALIDDATA;
338  } else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
339  av_log_ask_for_sample(avctx, "unsupported number of channels\n");
340  return AVERROR_PATCHWELCOME;
341  }
342 
344  for (i = 0; i < s->num_channels; i++)
346 
348  s->lfe_channel = -1;
349 
350  if (channel_mask & 8) {
351  unsigned int mask;
352  for (mask = 1; mask < 16; mask <<= 1) {
353  if (channel_mask & mask)
354  ++s->lfe_channel;
355  }
356  }
357 
359  scale_huffbits, 1, 1,
360  scale_huffcodes, 2, 2, 616);
361 
363  scale_rl_huffbits, 1, 1,
364  scale_rl_huffcodes, 4, 4, 1406);
365 
366  INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
367  coef0_huffbits, 1, 1,
368  coef0_huffcodes, 4, 4, 2108);
369 
370  INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
371  coef1_huffbits, 1, 1,
372  coef1_huffcodes, 4, 4, 3912);
373 
375  vec4_huffbits, 1, 1,
376  vec4_huffcodes, 2, 2, 604);
377 
379  vec2_huffbits, 1, 1,
380  vec2_huffcodes, 2, 2, 562);
381 
383  vec1_huffbits, 1, 1,
384  vec1_huffcodes, 2, 2, 562);
385 
388  for (i = 0; i < num_possible_block_sizes; i++) {
389  int subframe_len = s->samples_per_frame >> i;
390  int x;
391  int band = 1;
392 
393  s->sfb_offsets[i][0] = 0;
394 
395  for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
396  int offset = (subframe_len * 2 * critical_freq[x])
397  / s->avctx->sample_rate + 2;
398  offset &= ~3;
399  if (offset > s->sfb_offsets[i][band - 1])
400  s->sfb_offsets[i][band++] = offset;
401  }
402  s->sfb_offsets[i][band - 1] = subframe_len;
403  s->num_sfb[i] = band - 1;
404  }
405 
406 
412  for (i = 0; i < num_possible_block_sizes; i++) {
413  int b;
414  for (b = 0; b < s->num_sfb[i]; b++) {
415  int x;
416  int offset = ((s->sfb_offsets[i][b]
417  + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
418  for (x = 0; x < num_possible_block_sizes; x++) {
419  int v = 0;
420  while (s->sfb_offsets[x][v + 1] << x < offset)
421  ++v;
422  s->sf_offsets[i][x][b] = v;
423  }
424  }
425  }
426 
428  for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
430  1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
431  / (1 << (s->bits_per_sample - 1)));
432 
434  for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
435  const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
436  ff_init_ff_sine_windows(win_idx);
437  s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
438  }
439 
441  for (i = 0; i < num_possible_block_sizes; i++) {
442  int block_size = s->samples_per_frame >> i;
443  int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
444  / s->avctx->sample_rate;
445  s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
446  }
447 
449  for (i = 0; i < 33; i++)
450  sin64[i] = sin(i*M_PI / 64.0);
451 
452  if (avctx->debug & FF_DEBUG_BITSTREAM)
453  dump_context(s);
454 
455  avctx->channel_layout = channel_mask;
456 
458  avctx->coded_frame = &s->frame;
459 
460  return 0;
461 }
462 
469 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
470 {
471  int frame_len_shift = 0;
472  int subframe_len;
473 
475  if (offset == s->samples_per_frame - s->min_samples_per_subframe)
476  return s->min_samples_per_subframe;
477 
479  if (s->max_subframe_len_bit) {
480  if (get_bits1(&s->gb))
481  frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
482  } else
483  frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
484 
485  subframe_len = s->samples_per_frame >> frame_len_shift;
486 
488  if (subframe_len < s->min_samples_per_subframe ||
489  subframe_len > s->samples_per_frame) {
490  av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
491  subframe_len);
492  return AVERROR_INVALIDDATA;
493  }
494  return subframe_len;
495 }
496 
518 {
519  uint16_t num_samples[WMAPRO_MAX_CHANNELS];
520  uint8_t contains_subframe[WMAPRO_MAX_CHANNELS];
521  int channels_for_cur_subframe = s->num_channels;
522  int fixed_channel_layout = 0;
523  int min_channel_len = 0;
524  int c;
525 
526  /* Should never consume more than 3073 bits (256 iterations for the
527  * while loop when always the minimum amount of 128 samples is substracted
528  * from missing samples in the 8 channel case).
529  * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4)
530  */
531 
533  for (c = 0; c < s->num_channels; c++)
534  s->channel[c].num_subframes = 0;
535 
536  memset(num_samples, 0, sizeof(num_samples));
537 
538  if (s->max_num_subframes == 1 || get_bits1(&s->gb))
539  fixed_channel_layout = 1;
540 
542  do {
543  int subframe_len;
544 
546  for (c = 0; c < s->num_channels; c++) {
547  if (num_samples[c] == min_channel_len) {
548  if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
549  (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
550  contains_subframe[c] = 1;
551  else
552  contains_subframe[c] = get_bits1(&s->gb);
553  } else
554  contains_subframe[c] = 0;
555  }
556 
558  if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
559  return AVERROR_INVALIDDATA;
560 
562  min_channel_len += subframe_len;
563  for (c = 0; c < s->num_channels; c++) {
564  WMAProChannelCtx* chan = &s->channel[c];
565 
566  if (contains_subframe[c]) {
567  if (chan->num_subframes >= MAX_SUBFRAMES) {
569  "broken frame: num subframes > 31\n");
570  return AVERROR_INVALIDDATA;
571  }
572  chan->subframe_len[chan->num_subframes] = subframe_len;
573  num_samples[c] += subframe_len;
574  ++chan->num_subframes;
575  if (num_samples[c] > s->samples_per_frame) {
576  av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
577  "channel len > samples_per_frame\n");
578  return AVERROR_INVALIDDATA;
579  }
580  } else if (num_samples[c] <= min_channel_len) {
581  if (num_samples[c] < min_channel_len) {
582  channels_for_cur_subframe = 0;
583  min_channel_len = num_samples[c];
584  }
585  ++channels_for_cur_subframe;
586  }
587  }
588  } while (min_channel_len < s->samples_per_frame);
589 
590  for (c = 0; c < s->num_channels; c++) {
591  int i;
592  int offset = 0;
593  for (i = 0; i < s->channel[c].num_subframes; i++) {
594  av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
595  " len %i\n", s->frame_num, c, i,
596  s->channel[c].subframe_len[i]);
597  s->channel[c].subframe_offset[i] = offset;
598  offset += s->channel[c].subframe_len[i];
599  }
600  }
601 
602  return 0;
603 }
604 
611  WMAProChannelGrp *chgroup)
612 {
613  int i;
614  int offset = 0;
615  int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
616  memset(chgroup->decorrelation_matrix, 0, s->num_channels *
617  s->num_channels * sizeof(*chgroup->decorrelation_matrix));
618 
619  for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
620  rotation_offset[i] = get_bits(&s->gb, 6);
621 
622  for (i = 0; i < chgroup->num_channels; i++)
623  chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
624  get_bits1(&s->gb) ? 1.0 : -1.0;
625 
626  for (i = 1; i < chgroup->num_channels; i++) {
627  int x;
628  for (x = 0; x < i; x++) {
629  int y;
630  for (y = 0; y < i + 1; y++) {
631  float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
632  float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
633  int n = rotation_offset[offset + x];
634  float sinv;
635  float cosv;
636 
637  if (n < 32) {
638  sinv = sin64[n];
639  cosv = sin64[32 - n];
640  } else {
641  sinv = sin64[64 - n];
642  cosv = -sin64[n - 32];
643  }
644 
645  chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
646  (v1 * sinv) - (v2 * cosv);
647  chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
648  (v1 * cosv) + (v2 * sinv);
649  }
650  }
651  offset += i;
652  }
653 }
654 
661 {
662  int i;
663  /* should never consume more than 1921 bits for the 8 channel case
664  * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS
665  * + MAX_CHANNELS + MAX_BANDS + 1)
666  */
667 
669  s->num_chgroups = 0;
670  if (s->num_channels > 1) {
671  int remaining_channels = s->channels_for_cur_subframe;
672 
673  if (get_bits1(&s->gb)) {
675  "unsupported channel transform bit\n");
676  return AVERROR_INVALIDDATA;
677  }
678 
679  for (s->num_chgroups = 0; remaining_channels &&
681  WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
682  float** channel_data = chgroup->channel_data;
683  chgroup->num_channels = 0;
684  chgroup->transform = 0;
685 
687  if (remaining_channels > 2) {
688  for (i = 0; i < s->channels_for_cur_subframe; i++) {
689  int channel_idx = s->channel_indexes_for_cur_subframe[i];
690  if (!s->channel[channel_idx].grouped
691  && get_bits1(&s->gb)) {
692  ++chgroup->num_channels;
693  s->channel[channel_idx].grouped = 1;
694  *channel_data++ = s->channel[channel_idx].coeffs;
695  }
696  }
697  } else {
698  chgroup->num_channels = remaining_channels;
699  for (i = 0; i < s->channels_for_cur_subframe; i++) {
700  int channel_idx = s->channel_indexes_for_cur_subframe[i];
701  if (!s->channel[channel_idx].grouped)
702  *channel_data++ = s->channel[channel_idx].coeffs;
703  s->channel[channel_idx].grouped = 1;
704  }
705  }
706 
708  if (chgroup->num_channels == 2) {
709  if (get_bits1(&s->gb)) {
710  if (get_bits1(&s->gb)) {
712  "unsupported channel transform type\n");
713  }
714  } else {
715  chgroup->transform = 1;
716  if (s->num_channels == 2) {
717  chgroup->decorrelation_matrix[0] = 1.0;
718  chgroup->decorrelation_matrix[1] = -1.0;
719  chgroup->decorrelation_matrix[2] = 1.0;
720  chgroup->decorrelation_matrix[3] = 1.0;
721  } else {
723  chgroup->decorrelation_matrix[0] = 0.70703125;
724  chgroup->decorrelation_matrix[1] = -0.70703125;
725  chgroup->decorrelation_matrix[2] = 0.70703125;
726  chgroup->decorrelation_matrix[3] = 0.70703125;
727  }
728  }
729  } else if (chgroup->num_channels > 2) {
730  if (get_bits1(&s->gb)) {
731  chgroup->transform = 1;
732  if (get_bits1(&s->gb)) {
733  decode_decorrelation_matrix(s, chgroup);
734  } else {
736  if (chgroup->num_channels > 6) {
738  "coupled channels > 6\n");
739  } else {
740  memcpy(chgroup->decorrelation_matrix,
742  chgroup->num_channels * chgroup->num_channels *
743  sizeof(*chgroup->decorrelation_matrix));
744  }
745  }
746  }
747  }
748 
750  if (chgroup->transform) {
751  if (!get_bits1(&s->gb)) {
752  int i;
754  for (i = 0; i < s->num_bands; i++) {
755  chgroup->transform_band[i] = get_bits1(&s->gb);
756  }
757  } else {
758  memset(chgroup->transform_band, 1, s->num_bands);
759  }
760  }
761  remaining_channels -= chgroup->num_channels;
762  }
763  }
764  return 0;
765 }
766 
773 static int decode_coeffs(WMAProDecodeCtx *s, int c)
774 {
775  /* Integers 0..15 as single-precision floats. The table saves a
776  costly int to float conversion, and storing the values as
777  integers allows fast sign-flipping. */
778  static const uint32_t fval_tab[16] = {
779  0x00000000, 0x3f800000, 0x40000000, 0x40400000,
780  0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
781  0x41000000, 0x41100000, 0x41200000, 0x41300000,
782  0x41400000, 0x41500000, 0x41600000, 0x41700000,
783  };
784  int vlctable;
785  VLC* vlc;
786  WMAProChannelCtx* ci = &s->channel[c];
787  int rl_mode = 0;
788  int cur_coeff = 0;
789  int num_zeros = 0;
790  const uint16_t* run;
791  const float* level;
792 
793  av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
794 
795  vlctable = get_bits1(&s->gb);
796  vlc = &coef_vlc[vlctable];
797 
798  if (vlctable) {
799  run = coef1_run;
800  level = coef1_level;
801  } else {
802  run = coef0_run;
803  level = coef0_level;
804  }
805 
808  while ((s->transmit_num_vec_coeffs || !rl_mode) &&
809  (cur_coeff + 3 < ci->num_vec_coeffs)) {
810  uint32_t vals[4];
811  int i;
812  unsigned int idx;
813 
814  idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
815 
816  if (idx == HUFF_VEC4_SIZE - 1) {
817  for (i = 0; i < 4; i += 2) {
818  idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
819  if (idx == HUFF_VEC2_SIZE - 1) {
820  uint32_t v0, v1;
821  v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
822  if (v0 == HUFF_VEC1_SIZE - 1)
823  v0 += ff_wma_get_large_val(&s->gb);
824  v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
825  if (v1 == HUFF_VEC1_SIZE - 1)
826  v1 += ff_wma_get_large_val(&s->gb);
827  vals[i ] = av_float2int(v0);
828  vals[i+1] = av_float2int(v1);
829  } else {
830  vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
831  vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
832  }
833  }
834  } else {
835  vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
836  vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
837  vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
838  vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
839  }
840 
842  for (i = 0; i < 4; i++) {
843  if (vals[i]) {
844  uint32_t sign = get_bits1(&s->gb) - 1;
845  AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
846  num_zeros = 0;
847  } else {
848  ci->coeffs[cur_coeff] = 0;
851  rl_mode |= (++num_zeros > s->subframe_len >> 8);
852  }
853  ++cur_coeff;
854  }
855  }
856 
858  if (cur_coeff < s->subframe_len) {
859  memset(&ci->coeffs[cur_coeff], 0,
860  sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
861  if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
862  level, run, 1, ci->coeffs,
863  cur_coeff, s->subframe_len,
864  s->subframe_len, s->esc_len, 0))
865  return AVERROR_INVALIDDATA;
866  }
867 
868  return 0;
869 }
870 
877 {
878  int i;
879 
884  for (i = 0; i < s->channels_for_cur_subframe; i++) {
885  int c = s->channel_indexes_for_cur_subframe[i];
886  int* sf;
887  int* sf_end;
889  sf_end = s->channel[c].scale_factors + s->num_bands;
890 
896  if (s->channel[c].reuse_sf) {
897  const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
898  int b;
899  for (b = 0; b < s->num_bands; b++)
900  s->channel[c].scale_factors[b] =
901  s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
902  }
903 
904  if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
905 
906  if (!s->channel[c].reuse_sf) {
907  int val;
909  s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
910  val = 45 / s->channel[c].scale_factor_step;
911  for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
912  val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
913  *sf = val;
914  }
915  } else {
916  int i;
918  for (i = 0; i < s->num_bands; i++) {
919  int idx;
920  int skip;
921  int val;
922  int sign;
923 
924  idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
925 
926  if (!idx) {
927  uint32_t code = get_bits(&s->gb, 14);
928  val = code >> 6;
929  sign = (code & 1) - 1;
930  skip = (code & 0x3f) >> 1;
931  } else if (idx == 1) {
932  break;
933  } else {
934  skip = scale_rl_run[idx];
935  val = scale_rl_level[idx];
936  sign = get_bits1(&s->gb)-1;
937  }
938 
939  i += skip;
940  if (i >= s->num_bands) {
942  "invalid scale factor coding\n");
943  return AVERROR_INVALIDDATA;
944  }
945  s->channel[c].scale_factors[i] += (val ^ sign) - sign;
946  }
947  }
950  s->channel[c].table_idx = s->table_idx;
951  s->channel[c].reuse_sf = 1;
952  }
953 
956  for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
957  s->channel[c].max_scale_factor =
958  FFMAX(s->channel[c].max_scale_factor, *sf);
959  }
960 
961  }
962  return 0;
963 }
964 
970 {
971  int i;
972 
973  for (i = 0; i < s->num_chgroups; i++) {
974  if (s->chgroup[i].transform) {
975  float data[WMAPRO_MAX_CHANNELS];
976  const int num_channels = s->chgroup[i].num_channels;
977  float** ch_data = s->chgroup[i].channel_data;
978  float** ch_end = ch_data + num_channels;
979  const int8_t* tb = s->chgroup[i].transform_band;
980  int16_t* sfb;
981 
983  for (sfb = s->cur_sfb_offsets;
984  sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
985  int y;
986  if (*tb++ == 1) {
988  for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
989  const float* mat = s->chgroup[i].decorrelation_matrix;
990  const float* data_end = data + num_channels;
991  float* data_ptr = data;
992  float** ch;
993 
994  for (ch = ch_data; ch < ch_end; ch++)
995  *data_ptr++ = (*ch)[y];
996 
997  for (ch = ch_data; ch < ch_end; ch++) {
998  float sum = 0;
999  data_ptr = data;
1000  while (data_ptr < data_end)
1001  sum += *data_ptr++ * *mat++;
1002 
1003  (*ch)[y] = sum;
1004  }
1005  }
1006  } else if (s->num_channels == 2) {
1007  int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
1008  s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0],
1009  ch_data[0] + sfb[0],
1010  181.0 / 128, len);
1011  s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0],
1012  ch_data[1] + sfb[0],
1013  181.0 / 128, len);
1014  }
1015  }
1016  }
1017  }
1018 }
1019 
1025 {
1026  int i;
1027  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1028  int c = s->channel_indexes_for_cur_subframe[i];
1029  float* window;
1030  int winlen = s->channel[c].prev_block_len;
1031  float* start = s->channel[c].coeffs - (winlen >> 1);
1032 
1033  if (s->subframe_len < winlen) {
1034  start += (winlen - s->subframe_len) >> 1;
1035  winlen = s->subframe_len;
1036  }
1037 
1038  window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
1039 
1040  winlen >>= 1;
1041 
1042  s->dsp.vector_fmul_window(start, start, start + winlen,
1043  window, winlen);
1044 
1045  s->channel[c].prev_block_len = s->subframe_len;
1046  }
1047 }
1048 
1055 {
1056  int offset = s->samples_per_frame;
1057  int subframe_len = s->samples_per_frame;
1058  int i;
1059  int total_samples = s->samples_per_frame * s->num_channels;
1060  int transmit_coeffs = 0;
1061  int cur_subwoofer_cutoff;
1062 
1063  s->subframe_offset = get_bits_count(&s->gb);
1064 
1069  for (i = 0; i < s->num_channels; i++) {
1070  s->channel[i].grouped = 0;
1071  if (offset > s->channel[i].decoded_samples) {
1072  offset = s->channel[i].decoded_samples;
1073  subframe_len =
1075  }
1076  }
1077 
1078  av_dlog(s->avctx,
1079  "processing subframe with offset %i len %i\n", offset, subframe_len);
1080 
1083  for (i = 0; i < s->num_channels; i++) {
1084  const int cur_subframe = s->channel[i].cur_subframe;
1086  total_samples -= s->channel[i].decoded_samples;
1087 
1089  if (offset == s->channel[i].decoded_samples &&
1090  subframe_len == s->channel[i].subframe_len[cur_subframe]) {
1091  total_samples -= s->channel[i].subframe_len[cur_subframe];
1092  s->channel[i].decoded_samples +=
1093  s->channel[i].subframe_len[cur_subframe];
1096  }
1097  }
1098 
1101  if (!total_samples)
1102  s->parsed_all_subframes = 1;
1103 
1104 
1105  av_dlog(s->avctx, "subframe is part of %i channels\n",
1107 
1109  s->table_idx = av_log2(s->samples_per_frame/subframe_len);
1110  s->num_bands = s->num_sfb[s->table_idx];
1112  cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
1113 
1115  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1116  int c = s->channel_indexes_for_cur_subframe[i];
1117 
1118  s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1)
1119  + offset];
1120  }
1121 
1122  s->subframe_len = subframe_len;
1123  s->esc_len = av_log2(s->subframe_len - 1) + 1;
1124 
1126  if (get_bits1(&s->gb)) {
1127  int num_fill_bits;
1128  if (!(num_fill_bits = get_bits(&s->gb, 2))) {
1129  int len = get_bits(&s->gb, 4);
1130  num_fill_bits = get_bits(&s->gb, len) + 1;
1131  }
1132 
1133  if (num_fill_bits >= 0) {
1134  if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
1135  av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
1136  return AVERROR_INVALIDDATA;
1137  }
1138 
1139  skip_bits_long(&s->gb, num_fill_bits);
1140  }
1141  }
1142 
1144  if (get_bits1(&s->gb)) {
1145  av_log_ask_for_sample(s->avctx, "reserved bit set\n");
1146  return AVERROR_INVALIDDATA;
1147  }
1148 
1149 
1150  if (decode_channel_transform(s) < 0)
1151  return AVERROR_INVALIDDATA;
1152 
1153 
1154  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1155  int c = s->channel_indexes_for_cur_subframe[i];
1156  if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
1157  transmit_coeffs = 1;
1158  }
1159 
1160  if (transmit_coeffs) {
1161  int step;
1162  int quant_step = 90 * s->bits_per_sample >> 4;
1163 
1165  if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
1166  int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
1167  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1168  int c = s->channel_indexes_for_cur_subframe[i];
1169  s->channel[c].num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
1170  }
1171  } else {
1172  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1173  int c = s->channel_indexes_for_cur_subframe[i];
1174  s->channel[c].num_vec_coeffs = s->subframe_len;
1175  }
1176  }
1178  step = get_sbits(&s->gb, 6);
1179  quant_step += step;
1180  if (step == -32 || step == 31) {
1181  const int sign = (step == 31) - 1;
1182  int quant = 0;
1183  while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
1184  (step = get_bits(&s->gb, 5)) == 31) {
1185  quant += 31;
1186  }
1187  quant_step += ((quant + step) ^ sign) - sign;
1188  }
1189  if (quant_step < 0) {
1190  av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
1191  }
1192 
1195  if (s->channels_for_cur_subframe == 1) {
1196  s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
1197  } else {
1198  int modifier_len = get_bits(&s->gb, 3);
1199  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1200  int c = s->channel_indexes_for_cur_subframe[i];
1201  s->channel[c].quant_step = quant_step;
1202  if (get_bits1(&s->gb)) {
1203  if (modifier_len) {
1204  s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
1205  } else
1206  ++s->channel[c].quant_step;
1207  }
1208  }
1209  }
1210 
1212  if (decode_scale_factors(s) < 0)
1213  return AVERROR_INVALIDDATA;
1214  }
1215 
1216  av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
1217  get_bits_count(&s->gb) - s->subframe_offset);
1218 
1220  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1221  int c = s->channel_indexes_for_cur_subframe[i];
1222  if (s->channel[c].transmit_coefs &&
1223  get_bits_count(&s->gb) < s->num_saved_bits) {
1224  decode_coeffs(s, c);
1225  } else
1226  memset(s->channel[c].coeffs, 0,
1227  sizeof(*s->channel[c].coeffs) * subframe_len);
1228  }
1229 
1230  av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
1231  get_bits_count(&s->gb) - s->subframe_offset);
1232 
1233  if (transmit_coeffs) {
1234  FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
1237  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1238  int c = s->channel_indexes_for_cur_subframe[i];
1239  const int* sf = s->channel[c].scale_factors;
1240  int b;
1241 
1242  if (c == s->lfe_channel)
1243  memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
1244  (subframe_len - cur_subwoofer_cutoff));
1245 
1247  for (b = 0; b < s->num_bands; b++) {
1248  const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
1249  const int exp = s->channel[c].quant_step -
1250  (s->channel[c].max_scale_factor - *sf++) *
1251  s->channel[c].scale_factor_step;
1252  const float quant = pow(10.0, exp / 20.0);
1253  int start = s->cur_sfb_offsets[b];
1254  s->dsp.vector_fmul_scalar(s->tmp + start,
1255  s->channel[c].coeffs + start,
1256  quant, end - start);
1257  }
1258 
1260  mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
1261  }
1262  }
1263 
1265  wmapro_window(s);
1266 
1268  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1269  int c = s->channel_indexes_for_cur_subframe[i];
1270  if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
1271  av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
1272  return AVERROR_INVALIDDATA;
1273  }
1274  ++s->channel[c].cur_subframe;
1275  }
1276 
1277  return 0;
1278 }
1279 
1286 static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
1287 {
1288  AVCodecContext *avctx = s->avctx;
1289  GetBitContext* gb = &s->gb;
1290  int more_frames = 0;
1291  int len = 0;
1292  int i, ret;
1293  const float *out_ptr[WMAPRO_MAX_CHANNELS];
1294  float *samples;
1295 
1297  if (s->len_prefix)
1298  len = get_bits(gb, s->log2_frame_size);
1299 
1300  av_dlog(s->avctx, "decoding frame with length %x\n", len);
1301 
1303  if (decode_tilehdr(s)) {
1304  s->packet_loss = 1;
1305  return 0;
1306  }
1307 
1309  if (s->num_channels > 1 && get_bits1(gb)) {
1310  if (get_bits1(gb)) {
1311  for (i = 0; i < s->num_channels * s->num_channels; i++)
1312  skip_bits(gb, 4);
1313  }
1314  }
1315 
1317  if (s->dynamic_range_compression) {
1318  s->drc_gain = get_bits(gb, 8);
1319  av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
1320  }
1321 
1324  if (get_bits1(gb)) {
1325  int av_unused skip;
1326 
1328  if (get_bits1(gb)) {
1329  skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1330  av_dlog(s->avctx, "start skip: %i\n", skip);
1331  }
1332 
1334  if (get_bits1(gb)) {
1335  skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1336  av_dlog(s->avctx, "end skip: %i\n", skip);
1337  }
1338 
1339  }
1340 
1341  av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
1342  get_bits_count(gb) - s->frame_offset);
1343 
1345  s->parsed_all_subframes = 0;
1346  for (i = 0; i < s->num_channels; i++) {
1347  s->channel[i].decoded_samples = 0;
1348  s->channel[i].cur_subframe = 0;
1349  s->channel[i].reuse_sf = 0;
1350  }
1351 
1353  while (!s->parsed_all_subframes) {
1354  if (decode_subframe(s) < 0) {
1355  s->packet_loss = 1;
1356  return 0;
1357  }
1358  }
1359 
1360  /* get output buffer */
1362  if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
1363  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1364  s->packet_loss = 1;
1365  return 0;
1366  }
1367  samples = (float *)s->frame.data[0];
1368 
1370  for (i = 0; i < s->num_channels; i++)
1371  out_ptr[i] = s->channel[i].out;
1372  s->fmt_conv.float_interleave(samples, out_ptr, s->samples_per_frame,
1373  s->num_channels);
1374 
1375  for (i = 0; i < s->num_channels; i++) {
1377  memcpy(&s->channel[i].out[0],
1378  &s->channel[i].out[s->samples_per_frame],
1379  s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
1380  }
1381 
1382  if (s->skip_frame) {
1383  s->skip_frame = 0;
1384  *got_frame_ptr = 0;
1385  } else {
1386  *got_frame_ptr = 1;
1387  }
1388 
1389  if (s->len_prefix) {
1390  if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
1393  "frame[%i] would have to skip %i bits\n", s->frame_num,
1394  len - (get_bits_count(gb) - s->frame_offset) - 1);
1395  s->packet_loss = 1;
1396  return 0;
1397  }
1398 
1400  skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
1401  } else {
1402  while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
1403  }
1404  }
1405 
1407  more_frames = get_bits1(gb);
1408 
1409  ++s->frame_num;
1410  return more_frames;
1411 }
1412 
1420 {
1421  return s->buf_bit_size - get_bits_count(gb);
1422 }
1423 
1431 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
1432  int append)
1433 {
1434  int buflen;
1435 
1440  if (!append) {
1441  s->frame_offset = get_bits_count(gb) & 7;
1442  s->num_saved_bits = s->frame_offset;
1444  }
1445 
1446  buflen = (s->num_saved_bits + len + 8) >> 3;
1447 
1448  if (len <= 0 || buflen > MAX_FRAMESIZE) {
1449  av_log_ask_for_sample(s->avctx, "input buffer too small\n");
1450  s->packet_loss = 1;
1451  return;
1452  }
1453 
1454  s->num_saved_bits += len;
1455  if (!append) {
1456  avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
1457  s->num_saved_bits);
1458  } else {
1459  int align = 8 - (get_bits_count(gb) & 7);
1460  align = FFMIN(align, len);
1461  put_bits(&s->pb, align, get_bits(gb, align));
1462  len -= align;
1463  avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
1464  }
1465  skip_bits_long(gb, len);
1466 
1467  {
1468  PutBitContext tmp = s->pb;
1469  flush_put_bits(&tmp);
1470  }
1471 
1473  skip_bits(&s->gb, s->frame_offset);
1474 }
1475 
1484 static int decode_packet(AVCodecContext *avctx, void *data,
1485  int *got_frame_ptr, AVPacket* avpkt)
1486 {
1487  WMAProDecodeCtx *s = avctx->priv_data;
1488  GetBitContext* gb = &s->pgb;
1489  const uint8_t* buf = avpkt->data;
1490  int buf_size = avpkt->size;
1491  int num_bits_prev_frame;
1492  int packet_sequence_number;
1493 
1494  *got_frame_ptr = 0;
1495 
1496  if (s->packet_done || s->packet_loss) {
1497  s->packet_done = 0;
1498 
1500  if (buf_size < avctx->block_align)
1501  return 0;
1502 
1503  s->next_packet_start = buf_size - avctx->block_align;
1504  buf_size = avctx->block_align;
1505  s->buf_bit_size = buf_size << 3;
1506 
1508  init_get_bits(gb, buf, s->buf_bit_size);
1509  packet_sequence_number = get_bits(gb, 4);
1510  skip_bits(gb, 2);
1511 
1513  num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
1514  av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
1515  num_bits_prev_frame);
1516 
1518  if (!s->packet_loss &&
1519  ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
1520  s->packet_loss = 1;
1521  av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
1522  s->packet_sequence_number, packet_sequence_number);
1523  }
1524  s->packet_sequence_number = packet_sequence_number;
1525 
1526  if (num_bits_prev_frame > 0) {
1527  int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
1528  if (num_bits_prev_frame >= remaining_packet_bits) {
1529  num_bits_prev_frame = remaining_packet_bits;
1530  s->packet_done = 1;
1531  }
1532 
1535  save_bits(s, gb, num_bits_prev_frame, 1);
1536  av_dlog(avctx, "accumulated %x bits of frame data\n",
1537  s->num_saved_bits - s->frame_offset);
1538 
1540  if (!s->packet_loss)
1541  decode_frame(s, got_frame_ptr);
1542  } else if (s->num_saved_bits - s->frame_offset) {
1543  av_dlog(avctx, "ignoring %x previously saved bits\n",
1544  s->num_saved_bits - s->frame_offset);
1545  }
1546 
1547  if (s->packet_loss) {
1551  s->num_saved_bits = 0;
1552  s->packet_loss = 0;
1553  }
1554 
1555  } else {
1556  int frame_size;
1557  s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
1558  init_get_bits(gb, avpkt->data, s->buf_bit_size);
1559  skip_bits(gb, s->packet_offset);
1560  if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
1561  (frame_size = show_bits(gb, s->log2_frame_size)) &&
1562  frame_size <= remaining_bits(s, gb)) {
1563  save_bits(s, gb, frame_size, 0);
1564  s->packet_done = !decode_frame(s, got_frame_ptr);
1565  } else if (!s->len_prefix
1566  && s->num_saved_bits > get_bits_count(&s->gb)) {
1574  s->packet_done = !decode_frame(s, got_frame_ptr);
1575  } else
1576  s->packet_done = 1;
1577  }
1578 
1579  if (s->packet_done && !s->packet_loss &&
1580  remaining_bits(s, gb) > 0) {
1583  save_bits(s, gb, remaining_bits(s, gb), 0);
1584  }
1585 
1586  s->packet_offset = get_bits_count(gb) & 7;
1587  if (s->packet_loss)
1588  return AVERROR_INVALIDDATA;
1589 
1590  if (*got_frame_ptr)
1591  *(AVFrame *)data = s->frame;
1592 
1593  return get_bits_count(gb) >> 3;
1594 }
1595 
1600 static void flush(AVCodecContext *avctx)
1601 {
1602  WMAProDecodeCtx *s = avctx->priv_data;
1603  int i;
1606  for (i = 0; i < s->num_channels; i++)
1607  memset(s->channel[i].out, 0, s->samples_per_frame *
1608  sizeof(*s->channel[i].out));
1609  s->packet_loss = 1;
1610 }
1611 
1612 
1617  .name = "wmapro",
1618  .type = AVMEDIA_TYPE_AUDIO,
1619  .id = CODEC_ID_WMAPRO,
1620  .priv_data_size = sizeof(WMAProDecodeCtx),
1621  .init = decode_init,
1622  .close = decode_end,
1623  .decode = decode_packet,
1624  .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
1625  .flush= flush,
1626  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
1627 };