FFmpeg
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 FFmpeg.
7  *
8  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * @brief wmapro decoder implementation
26  * Wmapro is an MDCT based codec comparable to wma standard or AAC.
27  * The decoding therefore consists of the following steps:
28  * - bitstream decoding
29  * - reconstruction of per-channel data
30  * - rescaling and inverse quantization
31  * - IMDCT
32  * - windowing and overlapp-add
33  *
34  * The compressed wmapro bitstream is split into individual packets.
35  * Every such packet contains one or more wma frames.
36  * The compressed frames may have a variable length and frames may
37  * cross packet boundaries.
38  * Common to all wmapro frames is the number of samples that are stored in
39  * a frame.
40  * The number of samples and a few other decode flags are stored
41  * as extradata that has to be passed to the decoder.
42  *
43  * The wmapro frames themselves are again split into a variable number of
44  * subframes. Every subframe contains the data for 2^N time domain samples
45  * where N varies between 7 and 12.
46  *
47  * Example wmapro bitstream (in samples):
48  *
49  * || packet 0 || packet 1 || packet 2 packets
50  * ---------------------------------------------------
51  * || frame 0 || frame 1 || frame 2 || frames
52  * ---------------------------------------------------
53  * || | | || | | | || || subframes of channel 0
54  * ---------------------------------------------------
55  * || | | || | | | || || subframes of channel 1
56  * ---------------------------------------------------
57  *
58  * The frame layouts for the individual channels of a wma frame does not need
59  * to be the same.
60  *
61  * However, if the offsets and lengths of several subframes of a frame are the
62  * same, the subframes of the channels can be grouped.
63  * Every group may then use special coding techniques like M/S stereo coding
64  * to improve the compression ratio. These channel transformations do not
65  * need to be applied to a whole subframe. Instead, they can also work on
66  * individual scale factor bands (see below).
67  * The coefficients that carry the audio signal in the frequency domain
68  * are transmitted as huffman-coded vectors with 4, 2 and 1 elements.
69  * In addition to that, the encoder can switch to a runlevel coding scheme
70  * by transmitting subframe_length / 128 zero coefficients.
71  *
72  * Before the audio signal can be converted to the time domain, the
73  * coefficients have to be rescaled and inverse quantized.
74  * A subframe is therefore split into several scale factor bands that get
75  * scaled individually.
76  * Scale factors are submitted for every frame but they might be shared
77  * between the subframes of a channel. Scale factors are initially DPCM-coded.
78  * Once scale factors are shared, the differences are transmitted as runlevel
79  * codes.
80  * Every subframe length and offset combination in the frame layout shares a
81  * common quantization factor that can be adjusted for every channel by a
82  * modifier.
83  * After the inverse quantization, the coefficients get processed by an IMDCT.
84  * The resulting values are then windowed with a sine window and the first half
85  * of the values are added to the second half of the output from the previous
86  * subframe in order to reconstruct the output samples.
87  */
88 
89 #include <inttypes.h>
90 
91 #include "libavutil/ffmath.h"
92 #include "libavutil/float_dsp.h"
93 #include "libavutil/intfloat.h"
94 #include "libavutil/intreadwrite.h"
95 #include "avcodec.h"
96 #include "internal.h"
97 #include "get_bits.h"
98 #include "put_bits.h"
99 #include "wmaprodata.h"
100 #include "sinewin.h"
101 #include "wma.h"
102 #include "wma_common.h"
103 
104 /** current decoder limitations */
105 #define WMAPRO_MAX_CHANNELS 8 ///< max number of handled channels
106 #define MAX_SUBFRAMES 32 ///< max number of subframes per channel
107 #define MAX_BANDS 29 ///< max number of scale factor bands
108 #define MAX_FRAMESIZE 32768 ///< maximum compressed frame size
109 #define XMA_MAX_STREAMS 8
110 #define XMA_MAX_CHANNELS_STREAM 2
111 #define XMA_MAX_CHANNELS (XMA_MAX_STREAMS * XMA_MAX_CHANNELS_STREAM)
112 
113 #define WMAPRO_BLOCK_MIN_BITS 6 ///< log2 of min block size
114 #define WMAPRO_BLOCK_MAX_BITS 13 ///< log2 of max block size
115 #define WMAPRO_BLOCK_MIN_SIZE (1 << WMAPRO_BLOCK_MIN_BITS) ///< minimum block size
116 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size
117 #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes
118 
119 
120 #define VLCBITS 9
121 #define SCALEVLCBITS 8
122 #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS)
123 #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS)
124 #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS)
125 #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS)
126 #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS)
127 
128 static VLC sf_vlc; ///< scale factor DPCM vlc
129 static VLC sf_rl_vlc; ///< scale factor run length vlc
130 static VLC vec4_vlc; ///< 4 coefficients per symbol
131 static VLC vec2_vlc; ///< 2 coefficients per symbol
132 static VLC vec1_vlc; ///< 1 coefficient per symbol
133 static VLC coef_vlc[2]; ///< coefficient run length vlc codes
134 static float sin64[33]; ///< sine table for decorrelation
135 
136 /**
137  * @brief frame specific decoder context for a single channel
138  */
139 typedef struct WMAProChannelCtx {
140  int16_t prev_block_len; ///< length of the previous block
143  uint16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
144  uint16_t subframe_offset[MAX_SUBFRAMES]; ///< subframe positions in the current frame
145  uint8_t cur_subframe; ///< current subframe number
146  uint16_t decoded_samples; ///< number of already processed samples
147  uint8_t grouped; ///< channel is part of a group
148  int quant_step; ///< quantization step for the current subframe
149  int8_t reuse_sf; ///< share scale factors between subframes
150  int8_t scale_factor_step; ///< scaling step for the current subframe
151  int max_scale_factor; ///< maximum scale factor for the current subframe
152  int saved_scale_factors[2][MAX_BANDS]; ///< resampled and (previously) transmitted scale factor values
153  int8_t scale_factor_idx; ///< index for the transmitted scale factor values (used for resampling)
154  int* scale_factors; ///< pointer to the scale factor values used for decoding
155  uint8_t table_idx; ///< index in sf_offsets for the scale factor reference block
156  float* coeffs; ///< pointer to the subframe decode buffer
157  uint16_t num_vec_coeffs; ///< number of vector coded coefficients
158  DECLARE_ALIGNED(32, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2]; ///< output buffer
160 
161 /**
162  * @brief channel group for channel transformations
163  */
164 typedef struct WMAProChannelGrp {
165  uint8_t num_channels; ///< number of channels in the group
166  int8_t transform; ///< transform on / off
167  int8_t transform_band[MAX_BANDS]; ///< controls if the transform is enabled for a certain band
169  float* channel_data[WMAPRO_MAX_CHANNELS]; ///< transformation coefficients
171 
172 /**
173  * @brief main decoder context
174  */
175 typedef struct WMAProDecodeCtx {
176  /* generic decoder variables */
177  AVCodecContext* avctx; ///< codec context for av_log
180  AV_INPUT_BUFFER_PADDING_SIZE];///< compressed frame data
181  PutBitContext pb; ///< context for filling the frame_data buffer
182  FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES]; ///< MDCT context per block size
183  DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE]; ///< IMDCT output buffer
184  const float* windows[WMAPRO_BLOCK_SIZES]; ///< windows for the different block sizes
185 
186  /* frame size dependent frame information (set during initialization) */
187  uint32_t decode_flags; ///< used compression features
188  uint8_t len_prefix; ///< frame is prefixed with its length
189  uint8_t dynamic_range_compression; ///< frame contains DRC data
190  uint8_t bits_per_sample; ///< integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1.0])
191  uint16_t samples_per_frame; ///< number of samples to output
192  uint16_t log2_frame_size;
193  int8_t lfe_channel; ///< lfe channel index
195  uint8_t subframe_len_bits; ///< number of bits used for the subframe length
196  uint8_t max_subframe_len_bit; ///< flag indicating that the subframe is of maximum size when the first subframe length bit is 1
198  int8_t num_sfb[WMAPRO_BLOCK_SIZES]; ///< scale factor bands per block size
199  int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor band offsets (multiples of 4)
200  int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor resample matrix
201  int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; ///< subwoofer cutoff values
202 
203  /* packet decode state */
204  GetBitContext pgb; ///< bitstream reader context for the packet
205  int next_packet_start; ///< start offset of the next wma packet in the demuxer packet
206  uint8_t packet_offset; ///< frame offset in the packet
207  uint8_t packet_sequence_number; ///< current packet number
208  int num_saved_bits; ///< saved number of bits
209  int frame_offset; ///< frame offset in the bit reservoir
210  int subframe_offset; ///< subframe offset in the bit reservoir
211  uint8_t packet_loss; ///< set in case of bitstream error
212  uint8_t packet_done; ///< set when a packet is fully decoded
213  uint8_t eof_done; ///< set when EOF reached and extra subframe is written (XMA1/2)
214 
215  /* frame decode state */
216  uint32_t frame_num; ///< current frame number (not used for decoding)
217  GetBitContext gb; ///< bitstream reader context
218  int buf_bit_size; ///< buffer size in bits
219  uint8_t drc_gain; ///< gain for the DRC tool
220  int8_t skip_frame; ///< skip output step
221  int8_t parsed_all_subframes; ///< all subframes decoded?
222  uint8_t skip_packets; ///< packets to skip to find next packet in a stream (XMA1/2)
223 
224  /* subframe/block decode state */
225  int16_t subframe_len; ///< current subframe length
226  int8_t nb_channels; ///< number of channels in stream (XMA1/2)
227  int8_t channels_for_cur_subframe; ///< number of channels that contain the subframe
229  int8_t num_bands; ///< number of scale factor bands
230  int8_t transmit_num_vec_coeffs; ///< number of vector coded coefficients is part of the bitstream
231  int16_t* cur_sfb_offsets; ///< sfb offsets for the current block
232  uint8_t table_idx; ///< index for the num_sfb, sfb_offsets, sf_offsets and subwoofer_cutoffs tables
233  int8_t esc_len; ///< length of escaped coefficients
234 
235  uint8_t num_chgroups; ///< number of channel groups
236  WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS]; ///< channel group information
237 
240 
241 typedef struct XMADecodeCtx {
246  float samples[XMA_MAX_CHANNELS][512 * 64];
249 } XMADecodeCtx;
250 
251 /**
252  *@brief helper function to print the most important members of the context
253  *@param s context
254  */
256 {
257 #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
258 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %"PRIx32"\n", a, b);
259 
260  PRINT("ed sample bit depth", s->bits_per_sample);
261  PRINT_HEX("ed decode flags", s->decode_flags);
262  PRINT("samples per frame", s->samples_per_frame);
263  PRINT("log2 frame size", s->log2_frame_size);
264  PRINT("max num subframes", s->max_num_subframes);
265  PRINT("len prefix", s->len_prefix);
266  PRINT("num channels", s->nb_channels);
267 }
268 
269 /**
270  *@brief Uninitialize the decoder and free all resources.
271  *@param avctx codec context
272  *@return 0 on success, < 0 otherwise
273  */
275 {
276  int i;
277 
278  av_freep(&s->fdsp);
279 
280  for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
281  ff_mdct_end(&s->mdct_ctx[i]);
282 
283  return 0;
284 }
285 
287 {
288  WMAProDecodeCtx *s = avctx->priv_data;
289 
290  decode_end(s);
291 
292  return 0;
293 }
294 
295 static av_cold int get_rate(AVCodecContext *avctx)
296 {
297  if (avctx->codec_id != AV_CODEC_ID_WMAPRO) { // XXX: is this really only for XMA?
298  if (avctx->sample_rate > 44100)
299  return 48000;
300  else if (avctx->sample_rate > 32000)
301  return 44100;
302  else if (avctx->sample_rate > 24000)
303  return 32000;
304  return 24000;
305  }
306 
307  return avctx->sample_rate;
308 }
309 
310 /**
311  *@brief Initialize the decoder.
312  *@param avctx codec context
313  *@return 0 on success, -1 otherwise
314  */
315 static av_cold int decode_init(WMAProDecodeCtx *s, AVCodecContext *avctx, int num_stream)
316 {
317  uint8_t *edata_ptr = avctx->extradata;
318  unsigned int channel_mask;
319  int i, bits;
320  int log2_max_num_subframes;
321  int num_possible_block_sizes;
322 
323  if (avctx->codec_id == AV_CODEC_ID_XMA1 || avctx->codec_id == AV_CODEC_ID_XMA2)
324  avctx->block_align = 2048;
325 
326  if (!avctx->block_align) {
327  av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
328  return AVERROR(EINVAL);
329  }
330 
331  s->avctx = avctx;
332 
333  init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
334 
336 
337  /** dump the extradata */
338  av_log(avctx, AV_LOG_DEBUG, "extradata:\n");
339  for (i = 0; i < avctx->extradata_size; i++)
340  av_log(avctx, AV_LOG_DEBUG, "[%x] ", avctx->extradata[i]);
341  av_log(avctx, AV_LOG_DEBUG, "\n");
342 
343  if (avctx->codec_id == AV_CODEC_ID_XMA2 && avctx->extradata_size == 34) { /* XMA2WAVEFORMATEX */
344  s->decode_flags = 0x10d6;
345  s->bits_per_sample = 16;
346  channel_mask = 0; //AV_RL32(edata_ptr+2); /* not always in expected order */
347  if ((num_stream+1) * XMA_MAX_CHANNELS_STREAM > avctx->channels) /* stream config is 2ch + 2ch + ... + 1/2ch */
348  s->nb_channels = 1;
349  else
350  s->nb_channels = 2;
351  } else if (avctx->codec_id == AV_CODEC_ID_XMA2) { /* XMA2WAVEFORMAT */
352  s->decode_flags = 0x10d6;
353  s->bits_per_sample = 16;
354  channel_mask = 0; /* would need to aggregate from all streams */
355  s->nb_channels = edata_ptr[32 + ((edata_ptr[0]==3)?0:8) + 4*num_stream + 0]; /* nth stream config */
356  } else if (avctx->codec_id == AV_CODEC_ID_XMA1) { /* XMAWAVEFORMAT */
357  s->decode_flags = 0x10d6;
358  s->bits_per_sample = 16;
359  channel_mask = 0; /* would need to aggregate from all streams */
360  s->nb_channels = edata_ptr[8 + 20*num_stream + 17]; /* nth stream config */
361  } else if (avctx->codec_id == AV_CODEC_ID_WMAPRO && avctx->extradata_size >= 18) {
362  s->decode_flags = AV_RL16(edata_ptr+14);
363  channel_mask = AV_RL32(edata_ptr+2);
364  s->bits_per_sample = AV_RL16(edata_ptr);
365  s->nb_channels = avctx->channels;
366 
367  if (s->bits_per_sample > 32 || s->bits_per_sample < 1) {
368  avpriv_request_sample(avctx, "bits per sample is %d", s->bits_per_sample);
369  return AVERROR_PATCHWELCOME;
370  }
371  } else {
372  avpriv_request_sample(avctx, "Unknown extradata size");
373  return AVERROR_PATCHWELCOME;
374  }
375 
376  /** generic init */
377  s->log2_frame_size = av_log2(avctx->block_align) + 4;
378  if (s->log2_frame_size > 25) {
379  avpriv_request_sample(avctx, "Large block align");
380  return AVERROR_PATCHWELCOME;
381  }
382 
383  /** frame info */
384  if (avctx->codec_id != AV_CODEC_ID_WMAPRO)
385  s->skip_frame = 0;
386  else
387  s->skip_frame = 1; /* skip first frame */
388 
389  s->packet_loss = 1;
390  s->len_prefix = (s->decode_flags & 0x40);
391 
392  /** get frame len */
393  if (avctx->codec_id == AV_CODEC_ID_WMAPRO) {
394  bits = ff_wma_get_frame_len_bits(avctx->sample_rate, 3, s->decode_flags);
395  if (bits > WMAPRO_BLOCK_MAX_BITS) {
396  avpriv_request_sample(avctx, "14-bit block sizes");
397  return AVERROR_PATCHWELCOME;
398  }
399  s->samples_per_frame = 1 << bits;
400  } else {
401  s->samples_per_frame = 512;
402  }
403 
404  /** subframe info */
405  log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
406  s->max_num_subframes = 1 << log2_max_num_subframes;
407  if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
408  s->max_subframe_len_bit = 1;
409  s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
410 
411  num_possible_block_sizes = log2_max_num_subframes + 1;
412  s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
413  s->dynamic_range_compression = (s->decode_flags & 0x80);
414 
415  if (s->max_num_subframes > MAX_SUBFRAMES) {
416  av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %"PRId8"\n",
417  s->max_num_subframes);
418  return AVERROR_INVALIDDATA;
419  }
420 
421  if (s->min_samples_per_subframe < WMAPRO_BLOCK_MIN_SIZE) {
422  av_log(avctx, AV_LOG_ERROR, "min_samples_per_subframe of %d too small\n",
423  s->min_samples_per_subframe);
424  return AVERROR_INVALIDDATA;
425  }
426 
427  if (s->avctx->sample_rate <= 0) {
428  av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
429  return AVERROR_INVALIDDATA;
430  }
431 
432  if (s->nb_channels <= 0) {
433  av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n",
434  s->nb_channels);
435  return AVERROR_INVALIDDATA;
436  } else if (avctx->codec_id != AV_CODEC_ID_WMAPRO && s->nb_channels > XMA_MAX_CHANNELS_STREAM) {
437  av_log(avctx, AV_LOG_ERROR, "invalid number of channels per XMA stream %d\n",
438  s->nb_channels);
439  return AVERROR_INVALIDDATA;
440  } else if (s->nb_channels > WMAPRO_MAX_CHANNELS || s->nb_channels > avctx->channels) {
441  avpriv_request_sample(avctx,
442  "More than %d channels", WMAPRO_MAX_CHANNELS);
443  return AVERROR_PATCHWELCOME;
444  }
445 
446  /** init previous block len */
447  for (i = 0; i < s->nb_channels; i++)
448  s->channel[i].prev_block_len = s->samples_per_frame;
449 
450  /** extract lfe channel position */
451  s->lfe_channel = -1;
452 
453  if (channel_mask & 8) {
454  unsigned int mask;
455  for (mask = 1; mask < 16; mask <<= 1) {
456  if (channel_mask & mask)
457  ++s->lfe_channel;
458  }
459  }
460 
462  scale_huffbits, 1, 1,
463  scale_huffcodes, 2, 2, 616);
464 
466  scale_rl_huffbits, 1, 1,
467  scale_rl_huffcodes, 4, 4, 1406);
468 
470  coef0_huffbits, 1, 1,
471  coef0_huffcodes, 4, 4, 2108);
472 
474  coef1_huffbits, 1, 1,
475  coef1_huffcodes, 4, 4, 3912);
476 
478  vec4_huffbits, 1, 1,
479  vec4_huffcodes, 2, 2, 604);
480 
482  vec2_huffbits, 1, 1,
483  vec2_huffcodes, 2, 2, 562);
484 
486  vec1_huffbits, 1, 1,
487  vec1_huffcodes, 2, 2, 562);
488 
489  /** calculate number of scale factor bands and their offsets
490  for every possible block size */
491  for (i = 0; i < num_possible_block_sizes; i++) {
492  int subframe_len = s->samples_per_frame >> i;
493  int x;
494  int band = 1;
495  int rate = get_rate(avctx);
496 
497  s->sfb_offsets[i][0] = 0;
498 
499  for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
500  int offset = (subframe_len * 2 * critical_freq[x]) / rate + 2;
501  offset &= ~3;
502  if (offset > s->sfb_offsets[i][band - 1])
503  s->sfb_offsets[i][band++] = offset;
504 
505  if (offset >= subframe_len)
506  break;
507  }
508  s->sfb_offsets[i][band - 1] = subframe_len;
509  s->num_sfb[i] = band - 1;
510  if (s->num_sfb[i] <= 0) {
511  av_log(avctx, AV_LOG_ERROR, "num_sfb invalid\n");
512  return AVERROR_INVALIDDATA;
513  }
514  }
515 
516 
517  /** Scale factors can be shared between blocks of different size
518  as every block has a different scale factor band layout.
519  The matrix sf_offsets is needed to find the correct scale factor.
520  */
521 
522  for (i = 0; i < num_possible_block_sizes; i++) {
523  int b;
524  for (b = 0; b < s->num_sfb[i]; b++) {
525  int x;
526  int offset = ((s->sfb_offsets[i][b]
527  + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
528  for (x = 0; x < num_possible_block_sizes; x++) {
529  int v = 0;
530  while (s->sfb_offsets[x][v + 1] << x < offset) {
531  v++;
532  av_assert0(v < MAX_BANDS);
533  }
534  s->sf_offsets[i][x][b] = v;
535  }
536  }
537  }
538 
540  if (!s->fdsp)
541  return AVERROR(ENOMEM);
542 
543  /** init MDCT, FIXME: only init needed sizes */
544  for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
545  ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
546  1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
547  / (1ll << (s->bits_per_sample - 1)));
548 
549  /** init MDCT windows: simple sine window */
550  for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
551  const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
552  ff_init_ff_sine_windows(win_idx);
553  s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
554  }
555 
556  /** calculate subwoofer cutoff values */
557  for (i = 0; i < num_possible_block_sizes; i++) {
558  int block_size = s->samples_per_frame >> i;
559  int cutoff = (440*block_size + 3LL * (s->avctx->sample_rate >> 1) - 1)
560  / s->avctx->sample_rate;
561  s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
562  }
563 
564  /** calculate sine values for the decorrelation matrix */
565  for (i = 0; i < 33; i++)
566  sin64[i] = sin(i*M_PI / 64.0);
567 
568  if (avctx->debug & FF_DEBUG_BITSTREAM)
569  dump_context(s);
570 
571  avctx->channel_layout = channel_mask;
572 
573  return 0;
574 }
575 
576 /**
577  *@brief Initialize the decoder.
578  *@param avctx codec context
579  *@return 0 on success, -1 otherwise
580  */
582 {
583  WMAProDecodeCtx *s = avctx->priv_data;
584 
585  return decode_init(s, avctx, 0);
586 }
587 
588 /**
589  *@brief Decode the subframe length.
590  *@param s context
591  *@param offset sample offset in the frame
592  *@return decoded subframe length on success, < 0 in case of an error
593  */
595 {
596  int frame_len_shift = 0;
597  int subframe_len;
598 
599  /** no need to read from the bitstream when only one length is possible */
600  if (offset == s->samples_per_frame - s->min_samples_per_subframe)
601  return s->min_samples_per_subframe;
602 
603  if (get_bits_left(&s->gb) < 1)
604  return AVERROR_INVALIDDATA;
605 
606  /** 1 bit indicates if the subframe is of maximum length */
607  if (s->max_subframe_len_bit) {
608  if (get_bits1(&s->gb))
609  frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
610  } else
611  frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
612 
613  subframe_len = s->samples_per_frame >> frame_len_shift;
614 
615  /** sanity check the length */
616  if (subframe_len < s->min_samples_per_subframe ||
617  subframe_len > s->samples_per_frame) {
618  av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
619  subframe_len);
620  return AVERROR_INVALIDDATA;
621  }
622  return subframe_len;
623 }
624 
625 /**
626  *@brief Decode how the data in the frame is split into subframes.
627  * Every WMA frame contains the encoded data for a fixed number of
628  * samples per channel. The data for every channel might be split
629  * into several subframes. This function will reconstruct the list of
630  * subframes for every channel.
631  *
632  * If the subframes are not evenly split, the algorithm estimates the
633  * channels with the lowest number of total samples.
634  * Afterwards, for each of these channels a bit is read from the
635  * bitstream that indicates if the channel contains a subframe with the
636  * next subframe size that is going to be read from the bitstream or not.
637  * If a channel contains such a subframe, the subframe size gets added to
638  * the channel's subframe list.
639  * The algorithm repeats these steps until the frame is properly divided
640  * between the individual channels.
641  *
642  *@param s context
643  *@return 0 on success, < 0 in case of an error
644  */
646 {
647  uint16_t num_samples[WMAPRO_MAX_CHANNELS] = { 0 };/**< sum of samples for all currently known subframes of a channel */
648  uint8_t contains_subframe[WMAPRO_MAX_CHANNELS]; /**< flag indicating if a channel contains the current subframe */
649  int channels_for_cur_subframe = s->nb_channels; /**< number of channels that contain the current subframe */
650  int fixed_channel_layout = 0; /**< flag indicating that all channels use the same subframe offsets and sizes */
651  int min_channel_len = 0; /**< smallest sum of samples (channels with this length will be processed first) */
652  int c;
653 
654  /* Should never consume more than 3073 bits (256 iterations for the
655  * while loop when always the minimum amount of 128 samples is subtracted
656  * from missing samples in the 8 channel case).
657  * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4)
658  */
659 
660  /** reset tiling information */
661  for (c = 0; c < s->nb_channels; c++)
662  s->channel[c].num_subframes = 0;
663 
664  if (s->max_num_subframes == 1 || get_bits1(&s->gb))
665  fixed_channel_layout = 1;
666 
667  /** loop until the frame data is split between the subframes */
668  do {
669  int subframe_len;
670 
671  /** check which channels contain the subframe */
672  for (c = 0; c < s->nb_channels; c++) {
673  if (num_samples[c] == min_channel_len) {
674  if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
675  (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
676  contains_subframe[c] = 1;
677  else
678  contains_subframe[c] = get_bits1(&s->gb);
679  } else
680  contains_subframe[c] = 0;
681  }
682 
683  /** get subframe length, subframe_len == 0 is not allowed */
684  if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
685  return AVERROR_INVALIDDATA;
686 
687  /** add subframes to the individual channels and find new min_channel_len */
688  min_channel_len += subframe_len;
689  for (c = 0; c < s->nb_channels; c++) {
690  WMAProChannelCtx* chan = &s->channel[c];
691 
692  if (contains_subframe[c]) {
693  if (chan->num_subframes >= MAX_SUBFRAMES) {
694  av_log(s->avctx, AV_LOG_ERROR,
695  "broken frame: num subframes > 31\n");
696  return AVERROR_INVALIDDATA;
697  }
698  chan->subframe_len[chan->num_subframes] = subframe_len;
699  num_samples[c] += subframe_len;
700  ++chan->num_subframes;
701  if (num_samples[c] > s->samples_per_frame) {
702  av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
703  "channel len > samples_per_frame\n");
704  return AVERROR_INVALIDDATA;
705  }
706  } else if (num_samples[c] <= min_channel_len) {
707  if (num_samples[c] < min_channel_len) {
708  channels_for_cur_subframe = 0;
709  min_channel_len = num_samples[c];
710  }
711  ++channels_for_cur_subframe;
712  }
713  }
714  } while (min_channel_len < s->samples_per_frame);
715 
716  for (c = 0; c < s->nb_channels; c++) {
717  int i;
718  int offset = 0;
719  for (i = 0; i < s->channel[c].num_subframes; i++) {
720  ff_dlog(s->avctx, "frame[%"PRIu32"] channel[%i] subframe[%i]"
721  " len %i\n", s->frame_num, c, i,
722  s->channel[c].subframe_len[i]);
723  s->channel[c].subframe_offset[i] = offset;
724  offset += s->channel[c].subframe_len[i];
725  }
726  }
727 
728  return 0;
729 }
730 
731 /**
732  *@brief Calculate a decorrelation matrix from the bitstream parameters.
733  *@param s codec context
734  *@param chgroup channel group for which the matrix needs to be calculated
735  */
737  WMAProChannelGrp *chgroup)
738 {
739  int i;
740  int offset = 0;
741  int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
742  memset(chgroup->decorrelation_matrix, 0, s->nb_channels *
743  s->nb_channels * sizeof(*chgroup->decorrelation_matrix));
744 
745  for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
746  rotation_offset[i] = get_bits(&s->gb, 6);
747 
748  for (i = 0; i < chgroup->num_channels; i++)
749  chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
750  get_bits1(&s->gb) ? 1.0 : -1.0;
751 
752  for (i = 1; i < chgroup->num_channels; i++) {
753  int x;
754  for (x = 0; x < i; x++) {
755  int y;
756  for (y = 0; y < i + 1; y++) {
757  float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
758  float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
759  int n = rotation_offset[offset + x];
760  float sinv;
761  float cosv;
762 
763  if (n < 32) {
764  sinv = sin64[n];
765  cosv = sin64[32 - n];
766  } else {
767  sinv = sin64[64 - n];
768  cosv = -sin64[n - 32];
769  }
770 
771  chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
772  (v1 * sinv) - (v2 * cosv);
773  chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
774  (v1 * cosv) + (v2 * sinv);
775  }
776  }
777  offset += i;
778  }
779 }
780 
781 /**
782  *@brief Decode channel transformation parameters
783  *@param s codec context
784  *@return >= 0 in case of success, < 0 in case of bitstream errors
785  */
787 {
788  int i;
789  /* should never consume more than 1921 bits for the 8 channel case
790  * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS
791  * + MAX_CHANNELS + MAX_BANDS + 1)
792  */
793 
794  /** in the one channel case channel transforms are pointless */
795  s->num_chgroups = 0;
796  if (s->nb_channels > 1) {
797  int remaining_channels = s->channels_for_cur_subframe;
798 
799  if (get_bits1(&s->gb)) {
800  avpriv_request_sample(s->avctx,
801  "Channel transform bit");
802  return AVERROR_PATCHWELCOME;
803  }
804 
805  for (s->num_chgroups = 0; remaining_channels &&
806  s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
807  WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
808  float** channel_data = chgroup->channel_data;
809  chgroup->num_channels = 0;
810  chgroup->transform = 0;
811 
812  /** decode channel mask */
813  if (remaining_channels > 2) {
814  for (i = 0; i < s->channels_for_cur_subframe; i++) {
815  int channel_idx = s->channel_indexes_for_cur_subframe[i];
816  if (!s->channel[channel_idx].grouped
817  && get_bits1(&s->gb)) {
818  ++chgroup->num_channels;
819  s->channel[channel_idx].grouped = 1;
820  *channel_data++ = s->channel[channel_idx].coeffs;
821  }
822  }
823  } else {
824  chgroup->num_channels = remaining_channels;
825  for (i = 0; i < s->channels_for_cur_subframe; i++) {
826  int channel_idx = s->channel_indexes_for_cur_subframe[i];
827  if (!s->channel[channel_idx].grouped)
828  *channel_data++ = s->channel[channel_idx].coeffs;
829  s->channel[channel_idx].grouped = 1;
830  }
831  }
832 
833  /** decode transform type */
834  if (chgroup->num_channels == 2) {
835  if (get_bits1(&s->gb)) {
836  if (get_bits1(&s->gb)) {
837  avpriv_request_sample(s->avctx,
838  "Unknown channel transform type");
839  return AVERROR_PATCHWELCOME;
840  }
841  } else {
842  chgroup->transform = 1;
843  if (s->nb_channels == 2) {
844  chgroup->decorrelation_matrix[0] = 1.0;
845  chgroup->decorrelation_matrix[1] = -1.0;
846  chgroup->decorrelation_matrix[2] = 1.0;
847  chgroup->decorrelation_matrix[3] = 1.0;
848  } else {
849  /** cos(pi/4) */
850  chgroup->decorrelation_matrix[0] = 0.70703125;
851  chgroup->decorrelation_matrix[1] = -0.70703125;
852  chgroup->decorrelation_matrix[2] = 0.70703125;
853  chgroup->decorrelation_matrix[3] = 0.70703125;
854  }
855  }
856  } else if (chgroup->num_channels > 2) {
857  if (get_bits1(&s->gb)) {
858  chgroup->transform = 1;
859  if (get_bits1(&s->gb)) {
860  decode_decorrelation_matrix(s, chgroup);
861  } else {
862  /** FIXME: more than 6 coupled channels not supported */
863  if (chgroup->num_channels > 6) {
864  avpriv_request_sample(s->avctx,
865  "Coupled channels > 6");
866  } else {
867  memcpy(chgroup->decorrelation_matrix,
869  chgroup->num_channels * chgroup->num_channels *
870  sizeof(*chgroup->decorrelation_matrix));
871  }
872  }
873  }
874  }
875 
876  /** decode transform on / off */
877  if (chgroup->transform) {
878  if (!get_bits1(&s->gb)) {
879  int i;
880  /** transform can be enabled for individual bands */
881  for (i = 0; i < s->num_bands; i++) {
882  chgroup->transform_band[i] = get_bits1(&s->gb);
883  }
884  } else {
885  memset(chgroup->transform_band, 1, s->num_bands);
886  }
887  }
888  remaining_channels -= chgroup->num_channels;
889  }
890  }
891  return 0;
892 }
893 
894 /**
895  *@brief Extract the coefficients from the bitstream.
896  *@param s codec context
897  *@param c current channel number
898  *@return 0 on success, < 0 in case of bitstream errors
899  */
900 static int decode_coeffs(WMAProDecodeCtx *s, int c)
901 {
902  /* Integers 0..15 as single-precision floats. The table saves a
903  costly int to float conversion, and storing the values as
904  integers allows fast sign-flipping. */
905  static const uint32_t fval_tab[16] = {
906  0x00000000, 0x3f800000, 0x40000000, 0x40400000,
907  0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
908  0x41000000, 0x41100000, 0x41200000, 0x41300000,
909  0x41400000, 0x41500000, 0x41600000, 0x41700000,
910  };
911  int vlctable;
912  VLC* vlc;
913  WMAProChannelCtx* ci = &s->channel[c];
914  int rl_mode = 0;
915  int cur_coeff = 0;
916  int num_zeros = 0;
917  const uint16_t* run;
918  const float* level;
919 
920  ff_dlog(s->avctx, "decode coefficients for channel %i\n", c);
921 
922  vlctable = get_bits1(&s->gb);
923  vlc = &coef_vlc[vlctable];
924 
925  if (vlctable) {
926  run = coef1_run;
927  level = coef1_level;
928  } else {
929  run = coef0_run;
930  level = coef0_level;
931  }
932 
933  /** decode vector coefficients (consumes up to 167 bits per iteration for
934  4 vector coded large values) */
935  while ((s->transmit_num_vec_coeffs || !rl_mode) &&
936  (cur_coeff + 3 < ci->num_vec_coeffs)) {
937  uint32_t vals[4];
938  int i;
939  unsigned int idx;
940 
941  idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
942 
943  if (idx == HUFF_VEC4_SIZE - 1) {
944  for (i = 0; i < 4; i += 2) {
945  idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
946  if (idx == HUFF_VEC2_SIZE - 1) {
947  uint32_t v0, v1;
949  if (v0 == HUFF_VEC1_SIZE - 1)
950  v0 += ff_wma_get_large_val(&s->gb);
952  if (v1 == HUFF_VEC1_SIZE - 1)
953  v1 += ff_wma_get_large_val(&s->gb);
954  vals[i ] = av_float2int(v0);
955  vals[i+1] = av_float2int(v1);
956  } else {
957  vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
958  vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
959  }
960  }
961  } else {
962  vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
963  vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
964  vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
965  vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
966  }
967 
968  /** decode sign */
969  for (i = 0; i < 4; i++) {
970  if (vals[i]) {
971  uint32_t sign = get_bits1(&s->gb) - 1;
972  AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
973  num_zeros = 0;
974  } else {
975  ci->coeffs[cur_coeff] = 0;
976  /** switch to run level mode when subframe_len / 128 zeros
977  were found in a row */
978  rl_mode |= (++num_zeros > s->subframe_len >> 8);
979  }
980  ++cur_coeff;
981  }
982  }
983 
984  /** decode run level coded coefficients */
985  if (cur_coeff < s->subframe_len) {
986  memset(&ci->coeffs[cur_coeff], 0,
987  sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
988  if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
989  level, run, 1, ci->coeffs,
990  cur_coeff, s->subframe_len,
991  s->subframe_len, s->esc_len, 0))
992  return AVERROR_INVALIDDATA;
993  }
994 
995  return 0;
996 }
997 
998 /**
999  *@brief Extract scale factors from the bitstream.
1000  *@param s codec context
1001  *@return 0 on success, < 0 in case of bitstream errors
1002  */
1004 {
1005  int i;
1006 
1007  /** should never consume more than 5344 bits
1008  * MAX_CHANNELS * (1 + MAX_BANDS * 23)
1009  */
1010 
1011  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1012  int c = s->channel_indexes_for_cur_subframe[i];
1013  int* sf;
1014  int* sf_end;
1015  s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
1016  sf_end = s->channel[c].scale_factors + s->num_bands;
1017 
1018  /** resample scale factors for the new block size
1019  * as the scale factors might need to be resampled several times
1020  * before some new values are transmitted, a backup of the last
1021  * transmitted scale factors is kept in saved_scale_factors
1022  */
1023  if (s->channel[c].reuse_sf) {
1024  const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
1025  int b;
1026  for (b = 0; b < s->num_bands; b++)
1027  s->channel[c].scale_factors[b] =
1028  s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
1029  }
1030 
1031  if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
1032 
1033  if (!s->channel[c].reuse_sf) {
1034  int val;
1035  /** decode DPCM coded scale factors */
1036  s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
1037  val = 45 / s->channel[c].scale_factor_step;
1038  for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
1039  val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
1040  *sf = val;
1041  }
1042  } else {
1043  int i;
1044  /** run level decode differences to the resampled factors */
1045  for (i = 0; i < s->num_bands; i++) {
1046  int idx;
1047  int skip;
1048  int val;
1049  int sign;
1050 
1052 
1053  if (!idx) {
1054  uint32_t code = get_bits(&s->gb, 14);
1055  val = code >> 6;
1056  sign = (code & 1) - 1;
1057  skip = (code & 0x3f) >> 1;
1058  } else if (idx == 1) {
1059  break;
1060  } else {
1061  skip = scale_rl_run[idx];
1062  val = scale_rl_level[idx];
1063  sign = get_bits1(&s->gb)-1;
1064  }
1065 
1066  i += skip;
1067  if (i >= s->num_bands) {
1068  av_log(s->avctx, AV_LOG_ERROR,
1069  "invalid scale factor coding\n");
1070  return AVERROR_INVALIDDATA;
1071  }
1072  s->channel[c].scale_factors[i] += (val ^ sign) - sign;
1073  }
1074  }
1075  /** swap buffers */
1076  s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
1077  s->channel[c].table_idx = s->table_idx;
1078  s->channel[c].reuse_sf = 1;
1079  }
1080 
1081  /** calculate new scale factor maximum */
1082  s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
1083  for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
1084  s->channel[c].max_scale_factor =
1085  FFMAX(s->channel[c].max_scale_factor, *sf);
1086  }
1087 
1088  }
1089  return 0;
1090 }
1091 
1092 /**
1093  *@brief Reconstruct the individual channel data.
1094  *@param s codec context
1095  */
1097 {
1098  int i;
1099 
1100  for (i = 0; i < s->num_chgroups; i++) {
1101  if (s->chgroup[i].transform) {
1102  float data[WMAPRO_MAX_CHANNELS];
1103  const int num_channels = s->chgroup[i].num_channels;
1104  float** ch_data = s->chgroup[i].channel_data;
1105  float** ch_end = ch_data + num_channels;
1106  const int8_t* tb = s->chgroup[i].transform_band;
1107  int16_t* sfb;
1108 
1109  /** multichannel decorrelation */
1110  for (sfb = s->cur_sfb_offsets;
1111  sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
1112  int y;
1113  if (*tb++ == 1) {
1114  /** multiply values with the decorrelation_matrix */
1115  for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
1116  const float* mat = s->chgroup[i].decorrelation_matrix;
1117  const float* data_end = data + num_channels;
1118  float* data_ptr = data;
1119  float** ch;
1120 
1121  for (ch = ch_data; ch < ch_end; ch++)
1122  *data_ptr++ = (*ch)[y];
1123 
1124  for (ch = ch_data; ch < ch_end; ch++) {
1125  float sum = 0;
1126  data_ptr = data;
1127  while (data_ptr < data_end)
1128  sum += *data_ptr++ * *mat++;
1129 
1130  (*ch)[y] = sum;
1131  }
1132  }
1133  } else if (s->nb_channels == 2) {
1134  int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
1135  s->fdsp->vector_fmul_scalar(ch_data[0] + sfb[0],
1136  ch_data[0] + sfb[0],
1137  181.0 / 128, len);
1138  s->fdsp->vector_fmul_scalar(ch_data[1] + sfb[0],
1139  ch_data[1] + sfb[0],
1140  181.0 / 128, len);
1141  }
1142  }
1143  }
1144  }
1145 }
1146 
1147 /**
1148  *@brief Apply sine window and reconstruct the output buffer.
1149  *@param s codec context
1150  */
1152 {
1153  int i;
1154  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1155  int c = s->channel_indexes_for_cur_subframe[i];
1156  const float* window;
1157  int winlen = s->channel[c].prev_block_len;
1158  float* start = s->channel[c].coeffs - (winlen >> 1);
1159 
1160  if (s->subframe_len < winlen) {
1161  start += (winlen - s->subframe_len) >> 1;
1162  winlen = s->subframe_len;
1163  }
1164 
1165  window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
1166 
1167  winlen >>= 1;
1168 
1169  s->fdsp->vector_fmul_window(start, start, start + winlen,
1170  window, winlen);
1171 
1172  s->channel[c].prev_block_len = s->subframe_len;
1173  }
1174 }
1175 
1176 /**
1177  *@brief Decode a single subframe (block).
1178  *@param s codec context
1179  *@return 0 on success, < 0 when decoding failed
1180  */
1182 {
1183  int offset = s->samples_per_frame;
1184  int subframe_len = s->samples_per_frame;
1185  int i;
1186  int total_samples = s->samples_per_frame * s->nb_channels;
1187  int transmit_coeffs = 0;
1188  int cur_subwoofer_cutoff;
1189 
1190  s->subframe_offset = get_bits_count(&s->gb);
1191 
1192  /** reset channel context and find the next block offset and size
1193  == the next block of the channel with the smallest number of
1194  decoded samples
1195  */
1196  for (i = 0; i < s->nb_channels; i++) {
1197  s->channel[i].grouped = 0;
1198  if (offset > s->channel[i].decoded_samples) {
1199  offset = s->channel[i].decoded_samples;
1200  subframe_len =
1201  s->channel[i].subframe_len[s->channel[i].cur_subframe];
1202  }
1203  }
1204 
1205  ff_dlog(s->avctx,
1206  "processing subframe with offset %i len %i\n", offset, subframe_len);
1207 
1208  /** get a list of all channels that contain the estimated block */
1209  s->channels_for_cur_subframe = 0;
1210  for (i = 0; i < s->nb_channels; i++) {
1211  const int cur_subframe = s->channel[i].cur_subframe;
1212  /** subtract already processed samples */
1213  total_samples -= s->channel[i].decoded_samples;
1214 
1215  /** and count if there are multiple subframes that match our profile */
1216  if (offset == s->channel[i].decoded_samples &&
1217  subframe_len == s->channel[i].subframe_len[cur_subframe]) {
1218  total_samples -= s->channel[i].subframe_len[cur_subframe];
1219  s->channel[i].decoded_samples +=
1220  s->channel[i].subframe_len[cur_subframe];
1221  s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
1222  ++s->channels_for_cur_subframe;
1223  }
1224  }
1225 
1226  /** check if the frame will be complete after processing the
1227  estimated block */
1228  if (!total_samples)
1229  s->parsed_all_subframes = 1;
1230 
1231 
1232  ff_dlog(s->avctx, "subframe is part of %i channels\n",
1233  s->channels_for_cur_subframe);
1234 
1235  /** calculate number of scale factor bands and their offsets */
1236  s->table_idx = av_log2(s->samples_per_frame/subframe_len);
1237  s->num_bands = s->num_sfb[s->table_idx];
1238  s->cur_sfb_offsets = s->sfb_offsets[s->table_idx];
1239  cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
1240 
1241  /** configure the decoder for the current subframe */
1242  offset += s->samples_per_frame >> 1;
1243 
1244  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1245  int c = s->channel_indexes_for_cur_subframe[i];
1246 
1247  s->channel[c].coeffs = &s->channel[c].out[offset];
1248  }
1249 
1250  s->subframe_len = subframe_len;
1251  s->esc_len = av_log2(s->subframe_len - 1) + 1;
1252 
1253  /** skip extended header if any */
1254  if (get_bits1(&s->gb)) {
1255  int num_fill_bits;
1256  if (!(num_fill_bits = get_bits(&s->gb, 2))) {
1257  int len = get_bits(&s->gb, 4);
1258  num_fill_bits = get_bitsz(&s->gb, len) + 1;
1259  }
1260 
1261  if (num_fill_bits >= 0) {
1262  if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
1263  av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
1264  return AVERROR_INVALIDDATA;
1265  }
1266 
1267  skip_bits_long(&s->gb, num_fill_bits);
1268  }
1269  }
1270 
1271  /** no idea for what the following bit is used */
1272  if (get_bits1(&s->gb)) {
1273  avpriv_request_sample(s->avctx, "Reserved bit");
1274  return AVERROR_PATCHWELCOME;
1275  }
1276 
1277 
1278  if (decode_channel_transform(s) < 0)
1279  return AVERROR_INVALIDDATA;
1280 
1281 
1282  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1283  int c = s->channel_indexes_for_cur_subframe[i];
1284  if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
1285  transmit_coeffs = 1;
1286  }
1287 
1288  av_assert0(s->subframe_len <= WMAPRO_BLOCK_MAX_SIZE);
1289  if (transmit_coeffs) {
1290  int step;
1291  int quant_step = 90 * s->bits_per_sample >> 4;
1292 
1293  /** decode number of vector coded coefficients */
1294  if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
1295  int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
1296  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1297  int c = s->channel_indexes_for_cur_subframe[i];
1298  int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
1299  if (num_vec_coeffs > s->subframe_len) {
1300  av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
1301  return AVERROR_INVALIDDATA;
1302  }
1303  av_assert0(num_vec_coeffs + offset <= FF_ARRAY_ELEMS(s->channel[c].out));
1304  s->channel[c].num_vec_coeffs = num_vec_coeffs;
1305  }
1306  } else {
1307  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1308  int c = s->channel_indexes_for_cur_subframe[i];
1309  s->channel[c].num_vec_coeffs = s->subframe_len;
1310  }
1311  }
1312  /** decode quantization step */
1313  step = get_sbits(&s->gb, 6);
1314  quant_step += step;
1315  if (step == -32 || step == 31) {
1316  const int sign = (step == 31) - 1;
1317  int quant = 0;
1318  while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
1319  (step = get_bits(&s->gb, 5)) == 31) {
1320  quant += 31;
1321  }
1322  quant_step += ((quant + step) ^ sign) - sign;
1323  }
1324  if (quant_step < 0) {
1325  av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
1326  }
1327 
1328  /** decode quantization step modifiers for every channel */
1329 
1330  if (s->channels_for_cur_subframe == 1) {
1331  s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
1332  } else {
1333  int modifier_len = get_bits(&s->gb, 3);
1334  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1335  int c = s->channel_indexes_for_cur_subframe[i];
1336  s->channel[c].quant_step = quant_step;
1337  if (get_bits1(&s->gb)) {
1338  if (modifier_len) {
1339  s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
1340  } else
1341  ++s->channel[c].quant_step;
1342  }
1343  }
1344  }
1345 
1346  /** decode scale factors */
1347  if (decode_scale_factors(s) < 0)
1348  return AVERROR_INVALIDDATA;
1349  }
1350 
1351  ff_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
1352  get_bits_count(&s->gb) - s->subframe_offset);
1353 
1354  /** parse coefficients */
1355  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1356  int c = s->channel_indexes_for_cur_subframe[i];
1357  if (s->channel[c].transmit_coefs &&
1358  get_bits_count(&s->gb) < s->num_saved_bits) {
1359  decode_coeffs(s, c);
1360  } else
1361  memset(s->channel[c].coeffs, 0,
1362  sizeof(*s->channel[c].coeffs) * subframe_len);
1363  }
1364 
1365  ff_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
1366  get_bits_count(&s->gb) - s->subframe_offset);
1367 
1368  if (transmit_coeffs) {
1369  FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
1370  /** reconstruct the per channel data */
1372  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1373  int c = s->channel_indexes_for_cur_subframe[i];
1374  const int* sf = s->channel[c].scale_factors;
1375  int b;
1376 
1377  if (c == s->lfe_channel)
1378  memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
1379  (subframe_len - cur_subwoofer_cutoff));
1380 
1381  /** inverse quantization and rescaling */
1382  for (b = 0; b < s->num_bands; b++) {
1383  const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
1384  const int exp = s->channel[c].quant_step -
1385  (s->channel[c].max_scale_factor - *sf++) *
1386  s->channel[c].scale_factor_step;
1387  const float quant = ff_exp10(exp / 20.0);
1388  int start = s->cur_sfb_offsets[b];
1389  s->fdsp->vector_fmul_scalar(s->tmp + start,
1390  s->channel[c].coeffs + start,
1391  quant, end - start);
1392  }
1393 
1394  /** apply imdct (imdct_half == DCTIV with reverse) */
1395  mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
1396  }
1397  }
1398 
1399  /** window and overlapp-add */
1400  wmapro_window(s);
1401 
1402  /** handled one subframe */
1403  for (i = 0; i < s->channels_for_cur_subframe; i++) {
1404  int c = s->channel_indexes_for_cur_subframe[i];
1405  if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
1406  av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
1407  return AVERROR_INVALIDDATA;
1408  }
1409  ++s->channel[c].cur_subframe;
1410  }
1411 
1412  return 0;
1413 }
1414 
1415 /**
1416  *@brief Decode one WMA frame.
1417  *@param s codec context
1418  *@return 0 if the trailer bit indicates that this is the last frame,
1419  * 1 if there are additional frames
1420  */
1421 static int decode_frame(WMAProDecodeCtx *s, AVFrame *frame, int *got_frame_ptr)
1422 {
1423  GetBitContext* gb = &s->gb;
1424  int more_frames = 0;
1425  int len = 0;
1426  int i;
1427 
1428  /** get frame length */
1429  if (s->len_prefix)
1430  len = get_bits(gb, s->log2_frame_size);
1431 
1432  ff_dlog(s->avctx, "decoding frame with length %x\n", len);
1433 
1434  /** decode tile information */
1435  if (decode_tilehdr(s)) {
1436  s->packet_loss = 1;
1437  return 0;
1438  }
1439 
1440  /** read postproc transform */
1441  if (s->nb_channels > 1 && get_bits1(gb)) {
1442  if (get_bits1(gb)) {
1443  for (i = 0; i < s->nb_channels * s->nb_channels; i++)
1444  skip_bits(gb, 4);
1445  }
1446  }
1447 
1448  /** read drc info */
1449  if (s->dynamic_range_compression) {
1450  s->drc_gain = get_bits(gb, 8);
1451  ff_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
1452  }
1453 
1454  /** no idea what these are for, might be the number of samples
1455  that need to be skipped at the beginning or end of a stream */
1456  if (get_bits1(gb)) {
1457  int av_unused skip;
1458 
1459  /** usually true for the first frame */
1460  if (get_bits1(gb)) {
1461  skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1462  ff_dlog(s->avctx, "start skip: %i\n", skip);
1463  }
1464 
1465  /** sometimes true for the last frame */
1466  if (get_bits1(gb)) {
1467  skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1468  ff_dlog(s->avctx, "end skip: %i\n", skip);
1469  }
1470 
1471  }
1472 
1473  ff_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
1474  get_bits_count(gb) - s->frame_offset);
1475 
1476  /** reset subframe states */
1477  s->parsed_all_subframes = 0;
1478  for (i = 0; i < s->nb_channels; i++) {
1479  s->channel[i].decoded_samples = 0;
1480  s->channel[i].cur_subframe = 0;
1481  s->channel[i].reuse_sf = 0;
1482  }
1483 
1484  /** decode all subframes */
1485  while (!s->parsed_all_subframes) {
1486  if (decode_subframe(s) < 0) {
1487  s->packet_loss = 1;
1488  return 0;
1489  }
1490  }
1491 
1492  /** copy samples to the output buffer */
1493  for (i = 0; i < s->nb_channels; i++)
1494  memcpy(frame->extended_data[i], s->channel[i].out,
1495  s->samples_per_frame * sizeof(*s->channel[i].out));
1496 
1497  for (i = 0; i < s->nb_channels; i++) {
1498  /** reuse second half of the IMDCT output for the next frame */
1499  memcpy(&s->channel[i].out[0],
1500  &s->channel[i].out[s->samples_per_frame],
1501  s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
1502  }
1503 
1504  if (s->skip_frame) {
1505  s->skip_frame = 0;
1506  *got_frame_ptr = 0;
1508  } else {
1509  *got_frame_ptr = 1;
1510  }
1511 
1512  if (s->len_prefix) {
1513  if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
1514  /** FIXME: not sure if this is always an error */
1515  av_log(s->avctx, AV_LOG_ERROR,
1516  "frame[%"PRIu32"] would have to skip %i bits\n",
1517  s->frame_num,
1518  len - (get_bits_count(gb) - s->frame_offset) - 1);
1519  s->packet_loss = 1;
1520  return 0;
1521  }
1522 
1523  /** skip the rest of the frame data */
1524  skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
1525  } else {
1526  while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
1527  }
1528  }
1529 
1530  /** decode trailer bit */
1531  more_frames = get_bits1(gb);
1532 
1533  ++s->frame_num;
1534  return more_frames;
1535 }
1536 
1537 /**
1538  *@brief Calculate remaining input buffer length.
1539  *@param s codec context
1540  *@param gb bitstream reader context
1541  *@return remaining size in bits
1542  */
1544 {
1545  return s->buf_bit_size - get_bits_count(gb);
1546 }
1547 
1548 /**
1549  *@brief Fill the bit reservoir with a (partial) frame.
1550  *@param s codec context
1551  *@param gb bitstream reader context
1552  *@param len length of the partial frame
1553  *@param append decides whether to reset the buffer or not
1554  */
1556  int append)
1557 {
1558  int buflen;
1559 
1560  /** when the frame data does not need to be concatenated, the input buffer
1561  is reset and additional bits from the previous frame are copied
1562  and skipped later so that a fast byte copy is possible */
1563 
1564  if (!append) {
1565  s->frame_offset = get_bits_count(gb) & 7;
1566  s->num_saved_bits = s->frame_offset;
1567  init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
1568  buflen = (s->num_saved_bits + len + 7) >> 3;
1569  } else
1570  buflen = (put_bits_count(&s->pb) + len + 7) >> 3;
1571 
1572  if (len <= 0 || buflen > MAX_FRAMESIZE) {
1573  avpriv_request_sample(s->avctx, "Too small input buffer");
1574  s->packet_loss = 1;
1575  return;
1576  }
1577 
1578  av_assert0(len <= put_bits_left(&s->pb));
1579 
1580  s->num_saved_bits += len;
1581  if (!append) {
1582  avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
1583  s->num_saved_bits);
1584  } else {
1585  int align = 8 - (get_bits_count(gb) & 7);
1586  align = FFMIN(align, len);
1587  put_bits(&s->pb, align, get_bits(gb, align));
1588  len -= align;
1589  avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
1590  }
1591  skip_bits_long(gb, len);
1592 
1593  {
1594  PutBitContext tmp = s->pb;
1595  flush_put_bits(&tmp);
1596  }
1597 
1598  init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
1599  skip_bits(&s->gb, s->frame_offset);
1600 }
1601 
1603  void *data, int *got_frame_ptr, AVPacket *avpkt)
1604 {
1605  GetBitContext* gb = &s->pgb;
1606  const uint8_t* buf = avpkt->data;
1607  int buf_size = avpkt->size;
1608  int num_bits_prev_frame;
1609  int packet_sequence_number;
1610 
1611  *got_frame_ptr = 0;
1612 
1613  if (!buf_size) {
1614  AVFrame *frame = data;
1615  int i;
1616 
1617  /** Must output remaining samples after stream end. WMAPRO 5.1 created
1618  * by XWMA encoder don't though (maybe only 1/2ch streams need it). */
1619  s->packet_done = 0;
1620  if (s->eof_done)
1621  return 0;
1622 
1623  /** clean output buffer and copy last IMDCT samples */
1624  for (i = 0; i < s->nb_channels; i++) {
1625  memset(frame->extended_data[i], 0,
1626  s->samples_per_frame * sizeof(*s->channel[i].out));
1627 
1628  memcpy(frame->extended_data[i], s->channel[i].out,
1629  s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
1630  }
1631 
1632  /* TODO: XMA should output 128 samples only (instead of 512) and WMAPRO
1633  * maybe 768 (with 2048), XMA needs changes in multi-stream handling though. */
1634 
1635  s->eof_done = 1;
1636  s->packet_done = 1;
1637  *got_frame_ptr = 1;
1638  return 0;
1639  }
1640  else if (s->packet_done || s->packet_loss) {
1641  s->packet_done = 0;
1642 
1643  /** sanity check for the buffer length */
1644  if (avctx->codec_id == AV_CODEC_ID_WMAPRO && buf_size < avctx->block_align) {
1645  av_log(avctx, AV_LOG_ERROR, "Input packet too small (%d < %d)\n",
1646  buf_size, avctx->block_align);
1647  s->packet_loss = 1;
1648  return AVERROR_INVALIDDATA;
1649  }
1650 
1651  if (avctx->codec_id == AV_CODEC_ID_WMAPRO) {
1652  s->next_packet_start = buf_size - avctx->block_align;
1653  buf_size = avctx->block_align;
1654  } else {
1655  s->next_packet_start = buf_size - FFMIN(buf_size, avctx->block_align);
1656  buf_size = FFMIN(buf_size, avctx->block_align);
1657  }
1658  s->buf_bit_size = buf_size << 3;
1659 
1660  /** parse packet header */
1661  init_get_bits(gb, buf, s->buf_bit_size);
1662  if (avctx->codec_id != AV_CODEC_ID_XMA2) {
1663  packet_sequence_number = get_bits(gb, 4);
1664  skip_bits(gb, 2);
1665  } else {
1666  int num_frames = get_bits(gb, 6);
1667  ff_dlog(avctx, "packet[%d]: number of frames %d\n", avctx->frame_number, num_frames);
1668  packet_sequence_number = 0;
1669  }
1670 
1671  /** get number of bits that need to be added to the previous frame */
1672  num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
1673  if (avctx->codec_id != AV_CODEC_ID_WMAPRO) {
1674  skip_bits(gb, 3);
1675  s->skip_packets = get_bits(gb, 8);
1676  ff_dlog(avctx, "packet[%d]: skip packets %d\n", avctx->frame_number, s->skip_packets);
1677  }
1678 
1679  ff_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
1680  num_bits_prev_frame);
1681 
1682  /** check for packet loss */
1683  if (avctx->codec_id == AV_CODEC_ID_WMAPRO && !s->packet_loss &&
1684  ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
1685  s->packet_loss = 1;
1686  av_log(avctx, AV_LOG_ERROR,
1687  "Packet loss detected! seq %"PRIx8" vs %x\n",
1688  s->packet_sequence_number, packet_sequence_number);
1689  }
1690  s->packet_sequence_number = packet_sequence_number;
1691 
1692  if (num_bits_prev_frame > 0) {
1693  int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
1694  if (num_bits_prev_frame >= remaining_packet_bits) {
1695  num_bits_prev_frame = remaining_packet_bits;
1696  s->packet_done = 1;
1697  }
1698 
1699  /** append the previous frame data to the remaining data from the
1700  previous packet to create a full frame */
1701  save_bits(s, gb, num_bits_prev_frame, 1);
1702  ff_dlog(avctx, "accumulated %x bits of frame data\n",
1703  s->num_saved_bits - s->frame_offset);
1704 
1705  /** decode the cross packet frame if it is valid */
1706  if (!s->packet_loss)
1707  decode_frame(s, data, got_frame_ptr);
1708  } else if (s->num_saved_bits - s->frame_offset) {
1709  ff_dlog(avctx, "ignoring %x previously saved bits\n",
1710  s->num_saved_bits - s->frame_offset);
1711  }
1712 
1713  if (s->packet_loss) {
1714  /** reset number of saved bits so that the decoder
1715  does not start to decode incomplete frames in the
1716  s->len_prefix == 0 case */
1717  s->num_saved_bits = 0;
1718  s->packet_loss = 0;
1719  }
1720  } else {
1721  int frame_size;
1722 
1723  if (avpkt->size < s->next_packet_start) {
1724  s->packet_loss = 1;
1725  return AVERROR_INVALIDDATA;
1726  }
1727 
1728  s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
1729  init_get_bits(gb, avpkt->data, s->buf_bit_size);
1730  skip_bits(gb, s->packet_offset);
1731  if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
1732  (frame_size = show_bits(gb, s->log2_frame_size)) &&
1733  frame_size <= remaining_bits(s, gb)) {
1734  save_bits(s, gb, frame_size, 0);
1735  if (!s->packet_loss)
1736  s->packet_done = !decode_frame(s, data, got_frame_ptr);
1737  } else if (!s->len_prefix
1738  && s->num_saved_bits > get_bits_count(&s->gb)) {
1739  /** when the frames do not have a length prefix, we don't know
1740  the compressed length of the individual frames
1741  however, we know what part of a new packet belongs to the
1742  previous frame
1743  therefore we save the incoming packet first, then we append
1744  the "previous frame" data from the next packet so that
1745  we get a buffer that only contains full frames */
1746  s->packet_done = !decode_frame(s, data, got_frame_ptr);
1747  } else {
1748  s->packet_done = 1;
1749  }
1750  }
1751 
1752  if (remaining_bits(s, gb) < 0) {
1753  av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -remaining_bits(s, gb));
1754  s->packet_loss = 1;
1755  }
1756 
1757  if (s->packet_done && !s->packet_loss &&
1758  remaining_bits(s, gb) > 0) {
1759  /** save the rest of the data so that it can be decoded
1760  with the next packet */
1761  save_bits(s, gb, remaining_bits(s, gb), 0);
1762  }
1763 
1764  s->packet_offset = get_bits_count(gb) & 7;
1765  if (s->packet_loss)
1766  return AVERROR_INVALIDDATA;
1767 
1768  return get_bits_count(gb) >> 3;
1769 }
1770 
1771 /**
1772  *@brief Decode a single WMA packet.
1773  *@param avctx codec context
1774  *@param data the output buffer
1775  *@param avpkt input packet
1776  *@return number of bytes that were read from the input buffer
1777  */
1778 static int wmapro_decode_packet(AVCodecContext *avctx, void *data,
1779  int *got_frame_ptr, AVPacket *avpkt)
1780 {
1781  WMAProDecodeCtx *s = avctx->priv_data;
1782  AVFrame *frame = data;
1783  int ret;
1784 
1785  /* get output buffer */
1786  frame->nb_samples = s->samples_per_frame;
1787  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
1788  s->packet_loss = 1;
1789  return 0;
1790  }
1791 
1792  return decode_packet(avctx, s, data, got_frame_ptr, avpkt);
1793 }
1794 
1795 static int xma_decode_packet(AVCodecContext *avctx, void *data,
1796  int *got_frame_ptr, AVPacket *avpkt)
1797 {
1798  XMADecodeCtx *s = avctx->priv_data;
1799  int got_stream_frame_ptr = 0;
1800  AVFrame *frame = data;
1801  int i, ret, offset = INT_MAX;
1802 
1803  if (!s->frames[s->current_stream]->data[0]) {
1804  s->frames[s->current_stream]->nb_samples = 512;
1805  if ((ret = ff_get_buffer(avctx, s->frames[s->current_stream], 0)) < 0) {
1806  return ret;
1807  }
1808  }
1809  /* decode current stream packet */
1810  ret = decode_packet(avctx, &s->xma[s->current_stream], s->frames[s->current_stream],
1811  &got_stream_frame_ptr, avpkt);
1812 
1813  if (got_stream_frame_ptr && s->offset[s->current_stream] >= 64) {
1814  got_stream_frame_ptr = 0;
1816  }
1817 
1818  /* copy stream samples (1/2ch) to sample buffer (Nch) */
1819  if (got_stream_frame_ptr) {
1820  int start_ch = s->start_channel[s->current_stream];
1821  memcpy(&s->samples[start_ch + 0][s->offset[s->current_stream] * 512],
1822  s->frames[s->current_stream]->extended_data[0], 512 * 4);
1823  if (s->xma[s->current_stream].nb_channels > 1)
1824  memcpy(&s->samples[start_ch + 1][s->offset[s->current_stream] * 512],
1825  s->frames[s->current_stream]->extended_data[1], 512 * 4);
1826  s->offset[s->current_stream]++;
1827  } else if (ret < 0) {
1828  memset(s->offset, 0, sizeof(s->offset));
1829  s->current_stream = 0;
1830  return ret;
1831  }
1832 
1833  /* find next XMA packet's owner stream, and update.
1834  * XMA streams find their packets following packet_skips
1835  * (at start there is one packet per stream, then interleave non-linearly). */
1836  if (s->xma[s->current_stream].packet_done ||
1837  s->xma[s->current_stream].packet_loss) {
1838 
1839  /* select stream with 0 skip_packets (= uses next packet) */
1840  if (s->xma[s->current_stream].skip_packets != 0) {
1841  int min[2];
1842 
1843  min[0] = s->xma[0].skip_packets;
1844  min[1] = i = 0;
1845 
1846  for (i = 1; i < s->num_streams; i++) {
1847  if (s->xma[i].skip_packets < min[0]) {
1848  min[0] = s->xma[i].skip_packets;
1849  min[1] = i;
1850  }
1851  }
1852 
1853  s->current_stream = min[1];
1854  }
1855 
1856  /* all other streams skip next packet */
1857  for (i = 0; i < s->num_streams; i++) {
1858  s->xma[i].skip_packets = FFMAX(0, s->xma[i].skip_packets - 1);
1859  }
1860 
1861  /* copy samples from buffer to output if possible */
1862  for (i = 0; i < s->num_streams; i++) {
1863  offset = FFMIN(offset, s->offset[i]);
1864  }
1865  if (offset > 0) {
1866  int bret;
1867 
1868  frame->nb_samples = 512 * offset;
1869  if ((bret = ff_get_buffer(avctx, frame, 0)) < 0)
1870  return bret;
1871 
1872  /* copy samples buffer (Nch) to frame samples (Nch), move unconsumed samples */
1873  for (i = 0; i < s->num_streams; i++) {
1874  int start_ch = s->start_channel[i];
1875  memcpy(frame->extended_data[start_ch + 0], s->samples[start_ch + 0], frame->nb_samples * 4);
1876  if (s->xma[i].nb_channels > 1)
1877  memcpy(frame->extended_data[start_ch + 1], s->samples[start_ch + 1], frame->nb_samples * 4);
1878 
1879  s->offset[i] -= offset;
1880  if (s->offset[i]) {
1881  memmove(s->samples[start_ch + 0], s->samples[start_ch + 0] + frame->nb_samples, s->offset[i] * 4 * 512);
1882  if (s->xma[i].nb_channels > 1)
1883  memmove(s->samples[start_ch + 1], s->samples[start_ch + 1] + frame->nb_samples, s->offset[i] * 4 * 512);
1884  }
1885  }
1886 
1887  *got_frame_ptr = 1;
1888  }
1889  }
1890 
1891  return ret;
1892 }
1893 
1895 {
1896  XMADecodeCtx *s = avctx->priv_data;
1897  int i, ret, start_channels = 0;
1898 
1899  if (avctx->channels <= 0 || avctx->extradata_size == 0)
1900  return AVERROR_INVALIDDATA;
1901 
1902  /* get stream config */
1903  if (avctx->codec_id == AV_CODEC_ID_XMA2 && avctx->extradata_size == 34) { /* XMA2WAVEFORMATEX */
1904  s->num_streams = (avctx->channels + 1) / 2;
1905  } else if (avctx->codec_id == AV_CODEC_ID_XMA2 && avctx->extradata_size >= 2) { /* XMA2WAVEFORMAT */
1906  s->num_streams = avctx->extradata[1];
1907  if (avctx->extradata_size != (32 + ((avctx->extradata[0]==3)?0:8) + 4*s->num_streams)) {
1908  av_log(avctx, AV_LOG_ERROR, "Incorrect XMA2 extradata size\n");
1909  s->num_streams = 0;
1910  return AVERROR(EINVAL);
1911  }
1912  } else if (avctx->codec_id == AV_CODEC_ID_XMA1 && avctx->extradata_size >= 4) { /* XMAWAVEFORMAT */
1913  s->num_streams = avctx->extradata[4];
1914  if (avctx->extradata_size != (8 + 20*s->num_streams)) {
1915  av_log(avctx, AV_LOG_ERROR, "Incorrect XMA1 extradata size\n");
1916  s->num_streams = 0;
1917  return AVERROR(EINVAL);
1918  }
1919  } else {
1920  av_log(avctx, AV_LOG_ERROR, "Incorrect XMA config\n");
1921  return AVERROR(EINVAL);
1922  }
1923 
1924  /* encoder supports up to 64 streams / 64*2 channels (would have to alloc arrays) */
1925  if (avctx->channels > XMA_MAX_CHANNELS || s->num_streams > XMA_MAX_STREAMS ||
1926  s->num_streams <= 0
1927  ) {
1928  avpriv_request_sample(avctx, "More than %d channels in %d streams", XMA_MAX_CHANNELS, s->num_streams);
1929  s->num_streams = 0;
1930  return AVERROR_PATCHWELCOME;
1931  }
1932 
1933  /* init all streams (several streams of 1/2ch make Nch files) */
1934  for (i = 0; i < s->num_streams; i++) {
1935  ret = decode_init(&s->xma[i], avctx, i);
1936  if (ret < 0)
1937  return ret;
1938  s->frames[i] = av_frame_alloc();
1939  if (!s->frames[i])
1940  return AVERROR(ENOMEM);
1941 
1942  s->start_channel[i] = start_channels;
1943  start_channels += s->xma[i].nb_channels;
1944  }
1945  if (start_channels != avctx->channels)
1946  return AVERROR_INVALIDDATA;
1947 
1948  return ret;
1949 }
1950 
1952 {
1953  XMADecodeCtx *s = avctx->priv_data;
1954  int i;
1955 
1956  for (i = 0; i < s->num_streams; i++) {
1957  decode_end(&s->xma[i]);
1958  av_frame_free(&s->frames[i]);
1959  }
1960  s->num_streams = 0;
1961 
1962  return 0;
1963 }
1964 
1965 static void flush(WMAProDecodeCtx *s)
1966 {
1967  int i;
1968  /** reset output buffer as a part of it is used during the windowing of a
1969  new frame */
1970  for (i = 0; i < s->nb_channels; i++)
1971  memset(s->channel[i].out, 0, s->samples_per_frame *
1972  sizeof(*s->channel[i].out));
1973  s->packet_loss = 1;
1974  s->skip_packets = 0;
1975  s->eof_done = 0;
1976 }
1977 
1978 
1979 /**
1980  *@brief Clear decoder buffers (for seeking).
1981  *@param avctx codec context
1982  */
1983 static void wmapro_flush(AVCodecContext *avctx)
1984 {
1985  WMAProDecodeCtx *s = avctx->priv_data;
1986 
1987  flush(s);
1988 }
1989 
1990 static void xma_flush(AVCodecContext *avctx)
1991 {
1992  XMADecodeCtx *s = avctx->priv_data;
1993  int i;
1994 
1995  for (i = 0; i < s->num_streams; i++)
1996  flush(&s->xma[i]);
1997 
1998  memset(s->offset, 0, sizeof(s->offset));
1999  s->current_stream = 0;
2000 }
2001 
2002 
2003 /**
2004  *@brief wmapro decoder
2005  */
2007  .name = "wmapro",
2008  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
2009  .type = AVMEDIA_TYPE_AUDIO,
2010  .id = AV_CODEC_ID_WMAPRO,
2011  .priv_data_size = sizeof(WMAProDecodeCtx),
2013  .close = wmapro_decode_end,
2015  .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
2016  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
2017  .flush = wmapro_flush,
2018  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
2020 };
2021 
2023  .name = "xma1",
2024  .long_name = NULL_IF_CONFIG_SMALL("Xbox Media Audio 1"),
2025  .type = AVMEDIA_TYPE_AUDIO,
2026  .id = AV_CODEC_ID_XMA1,
2027  .priv_data_size = sizeof(XMADecodeCtx),
2028  .init = xma_decode_init,
2029  .close = xma_decode_end,
2032  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
2033  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
2035 };
2036 
2038  .name = "xma2",
2039  .long_name = NULL_IF_CONFIG_SMALL("Xbox Media Audio 2"),
2040  .type = AVMEDIA_TYPE_AUDIO,
2041  .id = AV_CODEC_ID_XMA2,
2042  .priv_data_size = sizeof(XMADecodeCtx),
2043  .init = xma_decode_init,
2044  .close = xma_decode_end,
2046  .flush = xma_flush,
2048  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
2049  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
2051 };
WMAProChannelCtx::num_vec_coeffs
uint16_t num_vec_coeffs
number of vector coded coefficients
Definition: wmaprodec.c:157
default_decorrelation
static const float *const default_decorrelation[]
default decorrelation matrix offsets
Definition: wmaprodata.h:594
xma_decode_init
static av_cold int xma_decode_init(AVCodecContext *avctx)
Definition: wmaprodec.c:1894
WMAProDecodeCtx::subframe_offset
int subframe_offset
subframe offset in the bit reservoir
Definition: wmaprodec.c:210
AVCodec
AVCodec.
Definition: codec.h:190
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:69
ff_xma2_decoder
AVCodec ff_xma2_decoder
Definition: wmaprodec.c:2037
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static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:291
XMA_MAX_CHANNELS
#define XMA_MAX_CHANNELS
Definition: wmaprodec.c:111
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static av_always_inline double ff_exp10(double x)
Compute 10^x for floating point values.
Definition: ffmath.h:42
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uint8_t level
Definition: svq3.c:210
SCALEMAXDEPTH
#define SCALEMAXDEPTH
Definition: wmaprodec.c:125
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static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
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static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
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void AAC_RENAME() ff_init_ff_sine_windows(int index)
initialize the specified entry of ff_sine_windows
Definition: sinewin_tablegen.h:76
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static int decode_subframe(WMAProDecodeCtx *s)
Decode a single subframe (block).
Definition: wmaprodec.c:1181
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
append
static uint8_t * append(uint8_t *buf, const uint8_t *src, int size)
Definition: mjpeg2jpeg_bsf.c:59
WMAProDecodeCtx::gb
GetBitContext gb
bitstream reader context
Definition: wmaprodec.c:217
WMAProDecodeCtx::samples_per_frame
uint16_t samples_per_frame
number of samples to output
Definition: wmaprodec.c:191
AVCodecContext::channel_layout
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1237
WMAProChannelCtx::scale_factor_step
int8_t scale_factor_step
scaling step for the current subframe
Definition: wmaprodec.c:150
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static const uint8_t scale_huffbits[HUFF_SCALE_SIZE]
Definition: wmaprodata.h:70
wmapro_window
static void wmapro_window(WMAProDecodeCtx *s)
Apply sine window and reconstruct the output buffer.
Definition: wmaprodec.c:1151
WMAPRO_BLOCK_MAX_BITS
#define WMAPRO_BLOCK_MAX_BITS
log2 of max block size
Definition: wmaprodec.c:114
WMAProDecodeCtx::min_samples_per_subframe
uint16_t min_samples_per_subframe
Definition: wmaprodec.c:197
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1186
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:716
WMAProChannelCtx::subframe_offset
uint16_t subframe_offset[MAX_SUBFRAMES]
subframe positions in the current frame
Definition: wmaprodec.c:144
HUFF_SCALE_SIZE
#define HUFF_SCALE_SIZE
Definition: wmaprodata.h:49
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static int decode_tilehdr(WMAProDecodeCtx *s)
Decode how the data in the frame is split into subframes.
Definition: wmaprodec.c:645
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#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:75
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
coef0_run
static const uint16_t coef0_run[HUFF_COEF0_SIZE]
Definition: wmaprodata.h:332
av_unused
#define av_unused
Definition: attributes.h:131
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
WMAProDecodeCtx::avctx
AVCodecContext * avctx
codec context for av_log
Definition: wmaprodec.c:177
end
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:92
sf_rl_vlc
static VLC sf_rl_vlc
scale factor run length vlc
Definition: wmaprodec.c:129
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:26
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:208
step
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step
Definition: rate_distortion.txt:58
wmapro_decode_init
static av_cold int wmapro_decode_init(AVCodecContext *avctx)
Initialize the decoder.
Definition: wmaprodec.c:581
flush
static void flush(WMAProDecodeCtx *s)
Definition: wmaprodec.c:1965
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:355
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static int decode_packet(AVCodecContext *avctx, WMAProDecodeCtx *s, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: wmaprodec.c:1602
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static av_cold int get_rate(AVCodecContext *avctx)
Definition: wmaprodec.c:295
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#define VLCBITS
Definition: wmaprodec.c:120
WMAPRO_BLOCK_MIN_SIZE
#define WMAPRO_BLOCK_MIN_SIZE
minimum block size
Definition: wmaprodec.c:115
b
#define b
Definition: input.c:41
decode_scale_factors
static int decode_scale_factors(WMAProDecodeCtx *s)
Extract scale factors from the bitstream.
Definition: wmaprodec.c:1003
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const char data[16]
Definition: mxf.c:91
ff_mdct_init
#define ff_mdct_init
Definition: fft.h:169
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:797
AV_WN32A
#define AV_WN32A(p, v)
Definition: intreadwrite.h:538
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static const uint8_t scale_rl_huffbits[HUFF_SCALE_RL_SIZE]
Definition: wmaprodata.h:118
WMAPRO_BLOCK_MAX_SIZE
#define WMAPRO_BLOCK_MAX_SIZE
maximum block size
Definition: wmaprodec.c:116
XMADecodeCtx::samples
float samples[XMA_MAX_CHANNELS][512 *64]
Definition: wmaprodec.c:246
av_float2int
static av_always_inline uint32_t av_float2int(float f)
Reinterpret a float as a 32-bit integer.
Definition: intfloat.h:50
intfloat.h
PRINT_HEX
#define PRINT_HEX(a, b)
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
PRINT
#define PRINT(a, b)
WMAProDecodeCtx::pb
PutBitContext pb
context for filling the frame_data buffer
Definition: wmaprodec.c:181
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static av_cold int decode_init(WMAProDecodeCtx *s, AVCodecContext *avctx, int num_stream)
Initialize the decoder.
Definition: wmaprodec.c:315
decode_end
static av_cold int decode_end(WMAProDecodeCtx *s)
Uninitialize the decoder and free all resources.
Definition: wmaprodec.c:274
WMAProDecodeCtx::fdsp
AVFloatDSPContext * fdsp
Definition: wmaprodec.c:178
WMAProDecodeCtx::sfb_offsets
int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS]
scale factor band offsets (multiples of 4)
Definition: wmaprodec.c:199
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static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
sin64
static float sin64[33]
sine table for decorrelation
Definition: wmaprodec.c:134
HUFF_SCALE_RL_SIZE
#define HUFF_SCALE_RL_SIZE
Definition: wmaprodata.h:95
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
ff_wmapro_decoder
AVCodec ff_wmapro_decoder
wmapro decoder
Definition: wmaprodec.c:2006
window
static SDL_Window * window
Definition: ffplay.c:368
vec2_vlc
static VLC vec2_vlc
2 coefficients per symbol
Definition: wmaprodec.c:131
v0
#define v0
Definition: regdef.h:26
wmapro_decode_end
static av_cold int wmapro_decode_end(AVCodecContext *avctx)
Definition: wmaprodec.c:286
GetBitContext
Definition: get_bits.h:61
WMAProDecodeCtx::num_chgroups
uint8_t num_chgroups
number of channel groups
Definition: wmaprodec.c:235
WMAProDecodeCtx::drc_gain
uint8_t drc_gain
gain for the DRC tool
Definition: wmaprodec.c:219
put_bits_left
static int put_bits_left(PutBitContext *s)
Definition: put_bits.h:93
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:606
val
static double val(void *priv, double ch)
Definition: aeval.c:76
WMAProDecodeCtx::num_bands
int8_t num_bands
number of scale factor bands
Definition: wmaprodec.c:229
WMAProDecodeCtx::tmp
float tmp[WMAPRO_BLOCK_MAX_SIZE]
IMDCT output buffer.
Definition: wmaprodec.c:183
SCALERLMAXDEPTH
#define SCALERLMAXDEPTH
Definition: wmaprodec.c:126
coef1_huffbits
static const uint8_t coef1_huffbits[555]
Definition: wmadata.h:335
WMAProDecodeCtx::sf_offsets
int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]
scale factor resample matrix
Definition: wmaprodec.c:200
WMAProDecodeCtx::chgroup
WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS]
channel group information
Definition: wmaprodec.c:236
coef1_huffcodes
static const uint32_t coef1_huffcodes[555]
Definition: wmadata.h:262
WMAProChannelCtx::max_scale_factor
int max_scale_factor
maximum scale factor for the current subframe
Definition: wmaprodec.c:151
WMAProChannelCtx::quant_step
int quant_step
quantization step for the current subframe
Definition: wmaprodec.c:148
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
WMAProChannelCtx::table_idx
uint8_t table_idx
index in sf_offsets for the scale factor reference block
Definition: wmaprodec.c:155
decode_subframe_length
static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
Decode the subframe length.
Definition: wmaprodec.c:594
WMAProChannelCtx::out
float out[WMAPRO_BLOCK_MAX_SIZE+WMAPRO_BLOCK_MAX_SIZE/2]
output buffer
Definition: wmaprodec.c:158
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
WMAProDecodeCtx::buf_bit_size
int buf_bit_size
buffer size in bits
Definition: wmaprodec.c:218
av_cold
#define av_cold
Definition: attributes.h:90
HUFF_COEF1_SIZE
#define HUFF_COEF1_SIZE
Definition: wmaprodata.h:253
symbol_to_vec4
static const uint16_t symbol_to_vec4[HUFF_VEC4_SIZE]
Definition: wmaprodata.h:540
WMAProDecodeCtx::subframe_len_bits
uint8_t subframe_len_bits
number of bits used for the subframe length
Definition: wmaprodec.c:195
mask
static const uint16_t mask[17]
Definition: lzw.c:38
decode_decorrelation_matrix
static void decode_decorrelation_matrix(WMAProDecodeCtx *s, WMAProChannelGrp *chgroup)
Calculate a decorrelation matrix from the bitstream parameters.
Definition: wmaprodec.c:736
WMAProChannelCtx
frame specific decoder context for a single channel
Definition: wmaprodec.c:139
wma_common.h
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:628
WMAProChannelCtx::scale_factors
int * scale_factors
pointer to the scale factor values used for decoding
Definition: wmaprodec.c:154
WMAProDecodeCtx::skip_frame
int8_t skip_frame
skip output step
Definition: wmaprodec.c:220
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_CODEC_ID_WMAPRO
@ AV_CODEC_ID_WMAPRO
Definition: codec_id.h:447
WMAProDecodeCtx::subwoofer_cutoffs
int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]
subwoofer cutoff values
Definition: wmaprodec.c:201
WMAProDecodeCtx::decode_flags
uint32_t decode_flags
used compression features
Definition: wmaprodec.c:187
AV_CODEC_ID_XMA1
@ AV_CODEC_ID_XMA1
Definition: codec_id.h:490
vec2_huffcodes
static const uint16_t vec2_huffcodes[HUFF_VEC2_SIZE]
Definition: wmaprodata.h:462
frame_size
int frame_size
Definition: mxfenc.c:2137
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
WMAProDecodeCtx::packet_loss
uint8_t packet_loss
set in case of bitstream error
Definition: wmaprodec.c:211
bits
uint8_t bits
Definition: vp3data.h:202
symbol_to_vec2
static const uint8_t symbol_to_vec2[HUFF_VEC2_SIZE]
Definition: wmaprodata.h:557
vec4_huffcodes
static const uint16_t vec4_huffcodes[HUFF_VEC4_SIZE]
Definition: wmaprodata.h:421
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
WMAProDecodeCtx::log2_frame_size
uint16_t log2_frame_size
Definition: wmaprodec.c:192
inverse_channel_transform
static void inverse_channel_transform(WMAProDecodeCtx *s)
Reconstruct the individual channel data.
Definition: wmaprodec.c:1096
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:359
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
get_bits.h
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:90
wma.h
XMADecodeCtx::xma
WMAProDecodeCtx xma[XMA_MAX_STREAMS]
Definition: wmaprodec.c:242
PutBitContext
Definition: put_bits.h:35
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:536
decode_coeffs
static int decode_coeffs(WMAProDecodeCtx *s, int c)
Extract the coefficients from the bitstream.
Definition: wmaprodec.c:900
if
if(ret)
Definition: filter_design.txt:179
XMA_MAX_CHANNELS_STREAM
#define XMA_MAX_CHANNELS_STREAM
Definition: wmaprodec.c:110
WMAProChannelCtx::prev_block_len
int16_t prev_block_len
length of the previous block
Definition: wmaprodec.c:140
WMAProDecodeCtx::transmit_num_vec_coeffs
int8_t transmit_num_vec_coeffs
number of vector coded coefficients is part of the bitstream
Definition: wmaprodec.c:230
GetBitContext::buffer
const uint8_t * buffer
Definition: get_bits.h:62
WMAProDecodeCtx::channel_indexes_for_cur_subframe
int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS]
Definition: wmaprodec.c:228
WMAProChannelCtx::grouped
uint8_t grouped
channel is part of a group
Definition: wmaprodec.c:147
XMADecodeCtx::start_channel
int start_channel[XMA_MAX_STREAMS]
Definition: wmaprodec.c:248
vec4_huffbits
static const uint8_t vec4_huffbits[HUFF_VEC4_SIZE]
Definition: wmaprodata.h:440
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
wmapro_flush
static void wmapro_flush(AVCodecContext *avctx)
Clear decoder buffers (for seeking).
Definition: wmaprodec.c:1983
run
uint8_t run
Definition: svq3.c:209
WMAProDecodeCtx::windows
const float * windows[WMAPRO_BLOCK_SIZES]
windows for the different block sizes
Definition: wmaprodec.c:184
WMAProChannelGrp::transform
int8_t transform
transform on / off
Definition: wmaprodec.c:166
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
WMAProDecodeCtx::nb_channels
int8_t nb_channels
number of channels in stream (XMA1/2)
Definition: wmaprodec.c:226
HUFF_VEC1_SIZE
#define HUFF_VEC1_SIZE
Definition: wmaprodata.h:505
xma_flush
static void xma_flush(AVCodecContext *avctx)
Definition: wmaprodec.c:1990
WMAPRO_MAX_CHANNELS
#define WMAPRO_MAX_CHANNELS
current decoder limitations
Definition: wmaprodec.c:105
WMAProChannelGrp
channel group for channel transformations
Definition: wmaprodec.c:164
exp
int8_t exp
Definition: eval.c:72
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
scale_rl_level
static const uint8_t scale_rl_level[HUFF_SCALE_RL_SIZE]
Definition: wmaprodata.h:150
float_dsp.h
WMAProDecodeCtx::eof_done
uint8_t eof_done
set when EOF reached and extra subframe is written (XMA1/2)
Definition: wmaprodec.c:213
FFTContext::imdct_half
void(* imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input)
Definition: fft.h:108
avpriv_copy_bits
void avpriv_copy_bits(PutBitContext *pb, const uint8_t *src, int length)
Copy the content of src to the bitstream.
Definition: bitstream.c:64
WMAProDecodeCtx::frame_num
uint32_t frame_num
current frame number (not used for decoding)
Definition: wmaprodec.c:216
sf_vlc
static VLC sf_vlc
scale factor DPCM vlc
Definition: wmaprodec.c:128
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1854
WMAProChannelCtx::num_subframes
uint8_t num_subframes
Definition: wmaprodec.c:142
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
AVPacket::size
int size
Definition: packet.h:356
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:188
HUFF_COEF0_SIZE
#define HUFF_COEF0_SIZE
Definition: wmaprodata.h:166
WMAProChannelCtx::coeffs
float * coeffs
pointer to the subframe decode buffer
Definition: wmaprodec.c:156
WMAProDecodeCtx::len_prefix
uint8_t len_prefix
frame is prefixed with its length
Definition: wmaprodec.c:188
critical_freq
static const uint16_t critical_freq[]
frequencies to divide the frequency spectrum into scale factor bands
Definition: wmaprodata.h:37
FFMAX
#define FFMAX(a, b)
Definition: common.h:94
WMAProChannelCtx::transmit_coefs
uint8_t transmit_coefs
Definition: wmaprodec.c:141
WMAPRO_BLOCK_SIZES
#define WMAPRO_BLOCK_SIZES
possible block sizes
Definition: wmaprodec.c:117
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1194
WMAProDecodeCtx::frame_data
uint8_t frame_data[MAX_FRAMESIZE+AV_INPUT_BUFFER_PADDING_SIZE]
compressed frame data
Definition: wmaprodec.c:180
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
coef0_huffbits
static const uint8_t coef0_huffbits[666]
Definition: wmadata.h:175
ff_mdct_end
#define ff_mdct_end
Definition: fft.h:170
WMAProChannelCtx::scale_factor_idx
int8_t scale_factor_idx
index for the transmitted scale factor values (used for resampling)
Definition: wmaprodec.c:153
MAX_SUBFRAMES
#define MAX_SUBFRAMES
max number of subframes per channel
Definition: wmaprodec.c:106
AVFloatDSPContext
Definition: float_dsp.h:24
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
vec1_huffbits
static const uint8_t vec1_huffbits[HUFF_VEC1_SIZE]
Definition: wmaprodata.h:523
sinewin.h
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
WMAProDecodeCtx::mdct_ctx
FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES]
MDCT context per block size.
Definition: wmaprodec.c:182
WMAProChannelGrp::transform_band
int8_t transform_band[MAX_BANDS]
controls if the transform is enabled for a certain band
Definition: wmaprodec.c:167
M_PI
#define M_PI
Definition: mathematics.h:52
XMA_MAX_STREAMS
#define XMA_MAX_STREAMS
Definition: wmaprodec.c:109
WMAProDecodeCtx::max_num_subframes
uint8_t max_num_subframes
Definition: wmaprodec.c:194
WMAProChannelCtx::reuse_sf
int8_t reuse_sf
share scale factors between subframes
Definition: wmaprodec.c:149
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:1187
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:112
WMAProDecodeCtx::next_packet_start
int next_packet_start
start offset of the next wma packet in the demuxer packet
Definition: wmaprodec.c:205
ff_xma1_decoder
AVCodec ff_xma1_decoder
Definition: wmaprodec.c:2022
FFTContext
Definition: fft.h:88
scale_rl_huffcodes
static const uint32_t scale_rl_huffcodes[HUFF_SCALE_RL_SIZE]
Definition: wmaprodata.h:97
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
put_bits_count
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:67
WMAProChannelCtx::cur_subframe
uint8_t cur_subframe
current subframe number
Definition: wmaprodec.c:145
scale_rl_run
static const uint8_t scale_rl_run[HUFF_SCALE_RL_SIZE]
Definition: wmaprodata.h:140
WMAProChannelCtx::decoded_samples
uint16_t decoded_samples
number of already processed samples
Definition: wmaprodec.c:146
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:627
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:48
HUFF_VEC2_SIZE
#define HUFF_VEC2_SIZE
Definition: wmaprodata.h:460
coef1_level
static const float coef1_level[HUFF_COEF1_SIZE]
Definition: wmaprodata.h:396
vec1_vlc
static VLC vec1_vlc
1 coefficient per symbol
Definition: wmaprodec.c:132
VEC1MAXDEPTH
#define VEC1MAXDEPTH
Definition: wmaprodec.c:124
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
MAX_BANDS
#define MAX_BANDS
max number of scale factor bands
Definition: wmaprodec.c:107
coef1_run
static const uint16_t coef1_run[HUFF_COEF1_SIZE]
Definition: wmaprodata.h:379
uint8_t
uint8_t
Definition: audio_convert.c:194
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:554
tb
#define tb
Definition: regdef.h:68
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:197
len
int len
Definition: vorbis_enc_data.h:452
HUFF_VEC4_SIZE
#define HUFF_VEC4_SIZE
Definition: wmaprodata.h:419
coef_vlc
static VLC coef_vlc[2]
coefficient run length vlc codes
Definition: wmaprodec.c:133
wmaprodata.h
tables for wmapro decoding
avcodec.h
xma_decode_packet
static int xma_decode_packet(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: wmaprodec.c:1795
WMAProDecodeCtx
main decoder context
Definition: wmaprodec.c:175
WMAProDecodeCtx::pgb
GetBitContext pgb
bitstream reader context for the packet
Definition: wmaprodec.c:204
ret
ret
Definition: filter_design.txt:187
AVCodecContext::block_align
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs.
Definition: avcodec.h:1223
XMADecodeCtx::offset
int offset[XMA_MAX_STREAMS]
Definition: wmaprodec.c:247
save_bits
static void save_bits(WMAProDecodeCtx *s, GetBitContext *gb, int len, int append)
Fill the bit reservoir with a (partial) frame.
Definition: wmaprodec.c:1555
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
WMAProChannelGrp::num_channels
uint8_t num_channels
number of channels in the group
Definition: wmaprodec.c:165
coef0_huffcodes
static const uint32_t coef0_huffcodes[666]
Definition: wmadata.h:88
dump_context
static av_cold void dump_context(WMAProDecodeCtx *s)
helper function to print the most important members of the context
Definition: wmaprodec.c:255
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: avcodec.h:215
decode_frame
static int decode_frame(WMAProDecodeCtx *s, AVFrame *frame, int *got_frame_ptr)
Decode one WMA frame.
Definition: wmaprodec.c:1421
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen_template.c:38
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:88
scale_huffcodes
static const uint16_t scale_huffcodes[HUFF_SCALE_SIZE]
Definition: wmaprodata.h:51
WMAProDecodeCtx::channels_for_cur_subframe
int8_t channels_for_cur_subframe
number of channels that contain the subframe
Definition: wmaprodec.c:227
AVCodecContext
main external API structure.
Definition: avcodec.h:526
ff_wma_get_frame_len_bits
av_cold int ff_wma_get_frame_len_bits(int sample_rate, int version, unsigned int decode_flags)
Get the samples per frame for this stream.
Definition: wma_common.c:32
VEC4MAXDEPTH
#define VEC4MAXDEPTH
Definition: wmaprodec.c:122
WMAProDecodeCtx::esc_len
int8_t esc_len
length of escaped coefficients
Definition: wmaprodec.c:233
WMAProDecodeCtx::table_idx
uint8_t table_idx
index for the num_sfb, sfb_offsets, sf_offsets and subwoofer_cutoffs tables
Definition: wmaprodec.c:232
WMAProDecodeCtx::num_sfb
int8_t num_sfb[WMAPRO_BLOCK_SIZES]
scale factor bands per block size
Definition: wmaprodec.c:198
vec2_huffbits
static const uint8_t vec2_huffbits[HUFF_VEC2_SIZE]
Definition: wmaprodata.h:483
XMADecodeCtx::num_streams
int num_streams
Definition: wmaprodec.c:245
WMAProChannelCtx::subframe_len
uint16_t subframe_len[MAX_SUBFRAMES]
subframe length in samples
Definition: wmaprodec.c:143
VLC
Definition: vlc.h:26
WMAProDecodeCtx::bits_per_sample
uint8_t bits_per_sample
integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1....
Definition: wmaprodec.c:190
SCALEVLCBITS
#define SCALEVLCBITS
Definition: wmaprodec.c:121
WMAProDecodeCtx::max_subframe_len_bit
uint8_t max_subframe_len_bit
flag indicating that the subframe is of maximum size when the first subframe length bit is 1
Definition: wmaprodec.c:196
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:75
ffmath.h
WMAProDecodeCtx::packet_offset
uint8_t packet_offset
frame offset in the packet
Definition: wmaprodec.c:206
WMAProDecodeCtx::skip_packets
uint8_t skip_packets
packets to skip to find next packet in a stream (XMA1/2)
Definition: wmaprodec.c:222
WMAProChannelGrp::channel_data
float * channel_data[WMAPRO_MAX_CHANNELS]
transformation coefficients
Definition: wmaprodec.c:169
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:1611
WMAProChannelCtx::saved_scale_factors
int saved_scale_factors[2][MAX_BANDS]
resampled and (previously) transmitted scale factor values
Definition: wmaprodec.c:152
WMAProDecodeCtx::frame_offset
int frame_offset
frame offset in the bit reservoir
Definition: wmaprodec.c:209
XMADecodeCtx::frames
AVFrame * frames[XMA_MAX_STREAMS]
Definition: wmaprodec.c:243
get_bitsz
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
Definition: get_bits.h:415
AV_CODEC_CAP_SUBFRAMES
#define AV_CODEC_CAP_SUBFRAMES
Codec can output multiple frames per AVPacket Normally demuxers return one frame at a time,...
Definition: codec.h:93
WMAProDecodeCtx::packet_done
uint8_t packet_done
set when a packet is fully decoded
Definition: wmaprodec.c:212
AV_CODEC_FLAG_BITEXACT
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:333
AVCodecContext::frame_number
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1217
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
xma_decode_end
static av_cold int xma_decode_end(AVCodecContext *avctx)
Definition: wmaprodec.c:1951
wmapro_decode_packet
static int wmapro_decode_packet(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Decode a single WMA packet.
Definition: wmaprodec.c:1778
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:101
WMAProDecodeCtx::lfe_channel
int8_t lfe_channel
lfe channel index
Definition: wmaprodec.c:193
quant
const uint8_t * quant
Definition: vorbis_enc_data.h:458
AV_CODEC_ID_XMA2
@ AV_CODEC_ID_XMA2
Definition: codec_id.h:491
ff_wma_run_level_decode
int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb, VLC *vlc, const float *level_table, const uint16_t *run_table, int version, WMACoef *ptr, int offset, int num_coefs, int block_len, int frame_len_bits, int coef_nb_bits)
Decode run level compressed coefficients.
Definition: wma.c:428
WMAProDecodeCtx::cur_sfb_offsets
int16_t * cur_sfb_offsets
sfb offsets for the current block
Definition: wmaprodec.c:231
decode_channel_transform
static int decode_channel_transform(WMAProDecodeCtx *s)
Decode channel transformation parameters.
Definition: wmaprodec.c:786
WMAProDecodeCtx::subframe_len
int16_t subframe_len
current subframe length
Definition: wmaprodec.c:225
WMAProDecodeCtx::parsed_all_subframes
int8_t parsed_all_subframes
all subframes decoded?
Definition: wmaprodec.c:221
AVPacket
This structure stores compressed data.
Definition: packet.h:332
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:553
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
avpriv_float_dsp_alloc
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
Definition: float_dsp.c:135
XMADecodeCtx
Definition: wmaprodec.c:241
coef0_level
static const float coef0_level[HUFF_COEF0_SIZE]
Definition: wmaprodata.h:355
MAX_FRAMESIZE
#define MAX_FRAMESIZE
maximum compressed frame size
Definition: wmaprodec.c:108
WMAProDecodeCtx::packet_sequence_number
uint8_t packet_sequence_number
current packet number
Definition: wmaprodec.c:207
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
WMAProDecodeCtx::dynamic_range_compression
uint8_t dynamic_range_compression
frame contains DRC data
Definition: wmaprodec.c:189
XMADecodeCtx::current_stream
int current_stream
Definition: wmaprodec.c:244
remaining_bits
static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
Calculate remaining input buffer length.
Definition: wmaprodec.c:1543
ff_wma_get_large_val
unsigned int ff_wma_get_large_val(GetBitContext *gb)
Decode an uncompressed coefficient.
Definition: wma.c:396
put_bits.h
FF_DEBUG_BITSTREAM
#define FF_DEBUG_BITSTREAM
Definition: avcodec.h:1614
WMAProDecodeCtx::num_saved_bits
int num_saved_bits
saved number of bits
Definition: wmaprodec.c:208
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
av_log2
int av_log2(unsigned v)
Definition: intmath.c:26
WMAProChannelGrp::decorrelation_matrix
float decorrelation_matrix[WMAPRO_MAX_CHANNELS *WMAPRO_MAX_CHANNELS]
Definition: wmaprodec.c:168
vec4_vlc
static VLC vec4_vlc
4 coefficients per symbol
Definition: wmaprodec.c:130
channel
channel
Definition: ebur128.h:39
vec1_huffcodes
static const uint16_t vec1_huffcodes[HUFF_VEC1_SIZE]
Definition: wmaprodata.h:507
VEC2MAXDEPTH
#define VEC2MAXDEPTH
Definition: wmaprodec.c:123
min
float min
Definition: vorbis_enc_data.h:456
WMAPRO_BLOCK_MIN_BITS
#define WMAPRO_BLOCK_MIN_BITS
log2 of min block size
Definition: wmaprodec.c:113