wmaenc.c
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1 /*
2  * WMA compatible encoder
3  * Copyright (c) 2007 Michael Niedermayer
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avcodec.h"
23 #include "wma.h"
24 
25 #undef NDEBUG
26 #include <assert.h>
27 
28 
29 static int encode_init(AVCodecContext * avctx){
30  WMACodecContext *s = avctx->priv_data;
31  int i, flags1, flags2;
32  uint8_t *extradata;
33 
34  s->avctx = avctx;
35 
36  if(avctx->channels > MAX_CHANNELS) {
37  av_log(avctx, AV_LOG_ERROR, "too many channels: got %i, need %i or fewer",
38  avctx->channels, MAX_CHANNELS);
39  return AVERROR(EINVAL);
40  }
41 
42  if (avctx->sample_rate > 48000) {
43  av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz",
44  avctx->sample_rate);
45  return AVERROR(EINVAL);
46  }
47 
48  if(avctx->bit_rate < 24*1000) {
49  av_log(avctx, AV_LOG_ERROR, "bitrate too low: got %i, need 24000 or higher\n",
50  avctx->bit_rate);
51  return AVERROR(EINVAL);
52  }
53 
54  /* extract flag infos */
55  flags1 = 0;
56  flags2 = 1;
57  if (avctx->codec->id == CODEC_ID_WMAV1) {
58  extradata= av_malloc(4);
59  avctx->extradata_size= 4;
60  AV_WL16(extradata, flags1);
61  AV_WL16(extradata+2, flags2);
62  } else if (avctx->codec->id == CODEC_ID_WMAV2) {
63  extradata= av_mallocz(10);
64  avctx->extradata_size= 10;
65  AV_WL32(extradata, flags1);
66  AV_WL16(extradata+4, flags2);
67  }else
68  assert(0);
69  avctx->extradata= extradata;
70  s->use_exp_vlc = flags2 & 0x0001;
71  s->use_bit_reservoir = flags2 & 0x0002;
72  s->use_variable_block_len = flags2 & 0x0004;
73  if (avctx->channels == 2)
74  s->ms_stereo = 1;
75 
76  ff_wma_init(avctx, flags2);
77 
78  /* init MDCT */
79  for(i = 0; i < s->nb_block_sizes; i++)
80  ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0);
81 
82  s->block_align = avctx->bit_rate * (int64_t)s->frame_len /
83  (avctx->sample_rate * 8);
85  avctx->block_align = s->block_align;
86  avctx->bit_rate = avctx->block_align * 8LL * avctx->sample_rate /
87  s->frame_len;
88 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d\n", s->block_align, avctx->bit_rate, s->frame_len, avctx->sample_rate);
89  avctx->frame_size= s->frame_len;
90 
91  return 0;
92 }
93 
94 
95 static void apply_window_and_mdct(AVCodecContext * avctx, const signed short * audio, int len) {
96  WMACodecContext *s = avctx->priv_data;
97  int window_index= s->frame_len_bits - s->block_len_bits;
98  FFTContext *mdct = &s->mdct_ctx[window_index];
99  int i, j, channel;
100  const float * win = s->windows[window_index];
101  int window_len = 1 << s->block_len_bits;
102  float n = window_len/2;
103 
104  for (channel = 0; channel < avctx->channels; channel++) {
105  memcpy(s->output, s->frame_out[channel], sizeof(float)*window_len);
106  j = channel;
107  for (i = 0; i < len; i++, j += avctx->channels){
108  s->output[i+window_len] = audio[j] / n * win[window_len - i - 1];
109  s->frame_out[channel][i] = audio[j] / n * win[i];
110  }
111  mdct->mdct_calc(mdct, s->coefs[channel], s->output);
112  }
113 }
114 
115 //FIXME use for decoding too
116 static void init_exp(WMACodecContext *s, int ch, const int *exp_param){
117  int n;
118  const uint16_t *ptr;
119  float v, *q, max_scale, *q_end;
120 
121  ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
122  q = s->exponents[ch];
123  q_end = q + s->block_len;
124  max_scale = 0;
125  while (q < q_end) {
126  /* XXX: use a table */
127  v = pow(10, *exp_param++ * (1.0 / 16.0));
128  max_scale= FFMAX(max_scale, v);
129  n = *ptr++;
130  do {
131  *q++ = v;
132  } while (--n);
133  }
134  s->max_exponent[ch] = max_scale;
135 }
136 
137 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param){
138  int last_exp;
139  const uint16_t *ptr;
140  float *q, *q_end;
141 
142  ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
143  q = s->exponents[ch];
144  q_end = q + s->block_len;
145  if (s->version == 1) {
146  last_exp= *exp_param++;
147  assert(last_exp-10 >= 0 && last_exp-10 < 32);
148  put_bits(&s->pb, 5, last_exp - 10);
149  q+= *ptr++;
150  }else
151  last_exp = 36;
152  while (q < q_end) {
153  int exp = *exp_param++;
154  int code = exp - last_exp + 60;
155  assert(code >= 0 && code < 120);
157  /* XXX: use a table */
158  q+= *ptr++;
159  last_exp= exp;
160  }
161 }
162 
163 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], int total_gain){
164  int v, bsize, ch, coef_nb_bits, parse_exponents;
165  float mdct_norm;
166  int nb_coefs[MAX_CHANNELS];
167  static const int fixed_exp[25]={20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20};
168 
169  //FIXME remove duplication relative to decoder
170  if (s->use_variable_block_len) {
171  assert(0); //FIXME not implemented
172  }else{
173  /* fixed block len */
177  }
178 
179  s->block_len = 1 << s->block_len_bits;
180 // assert((s->block_pos + s->block_len) <= s->frame_len);
181  bsize = s->frame_len_bits - s->block_len_bits;
182 
183  //FIXME factor
184  v = s->coefs_end[bsize] - s->coefs_start;
185  for(ch = 0; ch < s->nb_channels; ch++)
186  nb_coefs[ch] = v;
187  {
188  int n4 = s->block_len / 2;
189  mdct_norm = 1.0 / (float)n4;
190  if (s->version == 1) {
191  mdct_norm *= sqrt(n4);
192  }
193  }
194 
195  if (s->nb_channels == 2) {
196  put_bits(&s->pb, 1, !!s->ms_stereo);
197  }
198 
199  for(ch = 0; ch < s->nb_channels; ch++) {
200  s->channel_coded[ch] = 1; //FIXME only set channel_coded when needed, instead of always
201  if (s->channel_coded[ch]) {
202  init_exp(s, ch, fixed_exp);
203  }
204  }
205 
206  for(ch = 0; ch < s->nb_channels; ch++) {
207  if (s->channel_coded[ch]) {
208  WMACoef *coefs1;
209  float *coefs, *exponents, mult;
210  int i, n;
211 
212  coefs1 = s->coefs1[ch];
213  exponents = s->exponents[ch];
214  mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
215  mult *= mdct_norm;
216  coefs = src_coefs[ch];
217  if (s->use_noise_coding && 0) {
218  assert(0); //FIXME not implemented
219  } else {
220  coefs += s->coefs_start;
221  n = nb_coefs[ch];
222  for(i = 0;i < n; i++){
223  double t= *coefs++ / (exponents[i] * mult);
224  if(t<-32768 || t>32767)
225  return -1;
226 
227  coefs1[i] = lrint(t);
228  }
229  }
230  }
231  }
232 
233  v = 0;
234  for(ch = 0; ch < s->nb_channels; ch++) {
235  int a = s->channel_coded[ch];
236  put_bits(&s->pb, 1, a);
237  v |= a;
238  }
239 
240  if (!v)
241  return 1;
242 
243  for(v= total_gain-1; v>=127; v-= 127)
244  put_bits(&s->pb, 7, 127);
245  put_bits(&s->pb, 7, v);
246 
247  coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
248 
249  if (s->use_noise_coding) {
250  for(ch = 0; ch < s->nb_channels; ch++) {
251  if (s->channel_coded[ch]) {
252  int i, n;
253  n = s->exponent_high_sizes[bsize];
254  for(i=0;i<n;i++) {
255  put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0);
256  if (0)
257  nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
258  }
259  }
260  }
261  }
262 
263  parse_exponents = 1;
264  if (s->block_len_bits != s->frame_len_bits) {
265  put_bits(&s->pb, 1, parse_exponents);
266  }
267 
268  if (parse_exponents) {
269  for(ch = 0; ch < s->nb_channels; ch++) {
270  if (s->channel_coded[ch]) {
271  if (s->use_exp_vlc) {
272  encode_exp_vlc(s, ch, fixed_exp);
273  } else {
274  assert(0); //FIXME not implemented
275 // encode_exp_lsp(s, ch);
276  }
277  }
278  }
279  } else {
280  assert(0); //FIXME not implemented
281  }
282 
283  for(ch = 0; ch < s->nb_channels; ch++) {
284  if (s->channel_coded[ch]) {
285  int run, tindex;
286  WMACoef *ptr, *eptr;
287  tindex = (ch == 1 && s->ms_stereo);
288  ptr = &s->coefs1[ch][0];
289  eptr = ptr + nb_coefs[ch];
290 
291  run=0;
292  for(;ptr < eptr; ptr++){
293  if(*ptr){
294  int level= *ptr;
295  int abs_level= FFABS(level);
296  int code= 0;
297  if(abs_level <= s->coef_vlcs[tindex]->max_level){
298  if(run < s->coef_vlcs[tindex]->levels[abs_level-1])
299  code= run + s->int_table[tindex][abs_level-1];
300  }
301 
302  assert(code < s->coef_vlcs[tindex]->n);
303  put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]);
304 
305  if(code == 0){
306  if(1<<coef_nb_bits <= abs_level)
307  return -1;
308 
309 
310  //Workaround minor rounding differences for the regression tests, FIXME we should find and replace the problematic float by fixpoint for reg tests
311  if(abs_level == 0x71B && (s->avctx->flags & CODEC_FLAG_BITEXACT)) abs_level=0x71A;
312 
313  put_bits(&s->pb, coef_nb_bits, abs_level);
314  put_bits(&s->pb, s->frame_len_bits, run);
315  }
316  put_bits(&s->pb, 1, level < 0); //FIXME the sign is fliped somewhere
317  run=0;
318  }else{
319  run++;
320  }
321  }
322  if(run)
323  put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]);
324  }
325  if (s->version == 1 && s->nb_channels >= 2) {
327  }
328  }
329  return 0;
330 }
331 
332 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain){
333  init_put_bits(&s->pb, buf, buf_size);
334 
335  if (s->use_bit_reservoir) {
336  assert(0);//FIXME not implemented
337  }else{
338  if(encode_block(s, src_coefs, total_gain) < 0)
339  return INT_MAX;
340  }
341 
343 
344  return put_bits_count(&s->pb)/8 - s->block_align;
345 }
346 
348  unsigned char *buf, int buf_size, void *data){
349  WMACodecContext *s = avctx->priv_data;
350  const short *samples = data;
351  int i, total_gain;
352 
353  s->block_len_bits= s->frame_len_bits; //required by non variable block len
354  s->block_len = 1 << s->block_len_bits;
355 
356  apply_window_and_mdct(avctx, samples, avctx->frame_size);
357 
358  if (s->ms_stereo) {
359  float a, b;
360  int i;
361 
362  for(i = 0; i < s->block_len; i++) {
363  a = s->coefs[0][i]*0.5;
364  b = s->coefs[1][i]*0.5;
365  s->coefs[0][i] = a + b;
366  s->coefs[1][i] = a - b;
367  }
368  }
369 
370  if (buf_size < 2 * MAX_CODED_SUPERFRAME_SIZE) {
371  av_log(avctx, AV_LOG_ERROR, "output buffer size is too small\n");
372  return AVERROR(EINVAL);
373  }
374 
375 #if 1
376  total_gain= 128;
377  for(i=64; i; i>>=1){
378  int error= encode_frame(s, s->coefs, buf, buf_size, total_gain-i);
379  if(error<0)
380  total_gain-= i;
381  }
382 #else
383  total_gain= 90;
384  best= encode_frame(s, s->coefs, buf, buf_size, total_gain);
385  for(i=32; i; i>>=1){
386  int scoreL= encode_frame(s, s->coefs, buf, buf_size, total_gain-i);
387  int scoreR= encode_frame(s, s->coefs, buf, buf_size, total_gain+i);
388  av_log(NULL, AV_LOG_ERROR, "%d %d %d (%d)\n", scoreL, best, scoreR, total_gain);
389  if(scoreL < FFMIN(best, scoreR)){
390  best = scoreL;
391  total_gain -= i;
392  }else if(scoreR < best){
393  best = scoreR;
394  total_gain += i;
395  }
396  }
397 #endif
398 
399  encode_frame(s, s->coefs, buf, buf_size, total_gain);
400  assert((put_bits_count(&s->pb) & 7) == 0);
401  i= s->block_align - (put_bits_count(&s->pb)+7)/8;
402  assert(i>=0);
403  while(i--)
404  put_bits(&s->pb, 8, 'N');
405 
406  flush_put_bits(&s->pb);
407  return put_bits_ptr(&s->pb) - s->pb.buf;
408 }
409 
411  .name = "wmav1",
412  .type = AVMEDIA_TYPE_AUDIO,
413  .id = CODEC_ID_WMAV1,
414  .priv_data_size = sizeof(WMACodecContext),
415  .init = encode_init,
416  .encode = encode_superframe,
417  .close = ff_wma_end,
418  .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
419  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
420 };
421 
423  .name = "wmav2",
424  .type = AVMEDIA_TYPE_AUDIO,
425  .id = CODEC_ID_WMAV2,
426  .priv_data_size = sizeof(WMACodecContext),
427  .init = encode_init,
428  .encode = encode_superframe,
429  .close = ff_wma_end,
430  .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
431  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
432 };
int nb_channels
Definition: wma.h:72
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:154
static short * samples
Definition: ffmpeg.c:233
int block_align
Definition: wma.h:75
void(* mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input)
Definition: fft.h:83
int next_block_len_bits
log2 of next block length
Definition: wma.h:109
#define BLOCK_MAX_SIZE
Definition: wma.h:34
void avpriv_align_put_bits(PutBitContext *s)
Pad the bitstream with zeros up to the next byte boundary.
Definition: bitstream.c:44
int block_len
block length in samples
Definition: wma.h:111
enum CodecID id
Definition: avcodec.h:3198
#define b
Definition: swscale.c:1335
const uint8_t * huffbits
VLC bit size.
Definition: wma.h:62
uint8_t run
Definition: svq3.c:123
float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]
Definition: wma.h:117
struct AVCodec * codec
Definition: avcodec.h:1529
signed 16 bits
Definition: samplefmt.h:30
AVCodec.
Definition: avcodec.h:3189
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1751
#define v(n)
Definition: regs.h:34
float WMACoef
type for decoded coefficients, int16_t would be enough for wma 1/2
Definition: wma.h:56
#define AV_WL32(p, d)
Definition: intreadwrite.h:255
const uint8_t ff_aac_scalefactor_bits[121]
Definition: aactab.c:70
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1387
const uint32_t * huffcodes
VLC bit values.
Definition: wma.h:61
const char data[16]
Definition: mxf.c:60
static int encode_frame(WMACodecContext *s, float(*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain)
Definition: wmaenc.c:332
static int encode_init(AVCodecContext *avctx)
Definition: wmaenc.c:29
static float t
static int init(AVCodecParserContext *s)
Definition: h264_parser.c:336
int nb_block_sizes
number of block sizes
Definition: wma.h:105
int ff_wma_total_gain_to_bits(int total_gain)
Definition: wma.c:402
uint16_t * int_table[2]
Definition: wma.h:100
static uint8_t * put_bits_ptr(PutBitContext *s)
Return the pointer to the byte where the bitstream writer will put the next bit.
Definition: put_bits.h:204
static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param)
Definition: wmaenc.c:137
#define AVERROR(e)
Definition: error.h:43
uint16_t exponent_bands[BLOCK_NB_SIZES][25]
Definition: wma.h:83
uint8_t channel_coded[MAX_CHANNELS]
true if channel is coded
Definition: wma.h:115
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:191
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1355
uint8_t * buf
Definition: put_bits.h:42
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:140
const char * name
Name of the codec implementation.
Definition: avcodec.h:3196
static void put_bits(PutBitContext *s, int n, unsigned int value)
Write up to 31 bits into a bitstream.
Definition: put_bits.h:136
FFTSample output[BLOCK_MAX_SIZE *2]
Definition: wma.h:121
#define ff_mdct_init
Definition: fft.h:146
#define FFMAX(a, b)
Definition: common.h:53
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:70
int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]
Definition: wma.h:88
int ff_wma_end(AVCodecContext *avctx)
Definition: wma.c:411
Definition: fft.h:62
int bit_rate
the average bitrate
Definition: avcodec.h:1340
#define FFMIN(a, b)
Definition: common.h:55
static int encode_superframe(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data)
Definition: wmaenc.c:347
int use_bit_reservoir
Definition: wma.h:76
float * windows[BLOCK_NB_SIZES]
Definition: wma.h:123
#define MAX_CODED_SUPERFRAME_SIZE
Definition: wma.h:44
#define FFABS(a)
Definition: common.h:50
int version
1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
Definition: wma.h:74
int frame_len
frame length in samples
Definition: wma.h:103
static void init_exp(WMACodecContext *s, int ch, const int *exp_param)
Definition: wmaenc.c:116
int frame_size
Samples per packet, initialized when calling 'init'.
Definition: avcodec.h:1470
NULL
Definition: eval.c:50
int frame_len_bits
frame_len = 1 << frame_len_bits
Definition: wma.h:104
external API header
int sample_rate
samples per second
Definition: avcodec.h:1456
int use_exp_vlc
exponent coding: 0 = lsp, 1 = vlc + delta
Definition: wma.h:78
main external API structure.
Definition: avcodec.h:1329
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:327
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:111
AVCodecContext * avctx
Definition: wma.h:67
float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE *2]
Definition: wma.h:125
static int16_t mult(Float11 *f1, Float11 *f2)
Definition: g726.c:54
int extradata_size
Definition: avcodec.h:1388
int exponent_high_sizes[BLOCK_NB_SIZES]
Definition: wma.h:87
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:64
static void apply_window_and_mdct(AVCodecContext *avctx, const signed short *audio, int len)
Definition: wmaenc.c:95
int use_noise_coding
true if perceptual noise is added
Definition: wma.h:79
AVCodec ff_wmav1_encoder
Definition: wmaenc.c:410
static av_always_inline av_const long int lrint(double x)
Definition: libm.h:62
#define MAX_CHANNELS
Definition: aac.h:42
int use_variable_block_len
Definition: wma.h:77
uint8_t ms_stereo
true if mid/side stereo mode
Definition: wma.h:114
FFTContext mdct_ctx[BLOCK_NB_SIZES]
Definition: wma.h:122
const uint32_t ff_aac_scalefactor_code[121]
Definition: aactab.c:51
AVCodec ff_wmav2_encoder
Definition: wmaenc.c:422
float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]
Definition: wma.h:120
uint8_t level
Definition: svq3.c:123
int prev_block_len_bits
log2 of prev block length
Definition: wma.h:110
static int encode_block(WMACodecContext *s, float(*src_coefs)[BLOCK_MAX_SIZE], int total_gain)
Definition: wmaenc.c:163
int coefs_end[BLOCK_NB_SIZES]
max number of coded coefficients
Definition: wma.h:86
struct WMACodecContext WMACodecContext
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:86
AVSampleFormat
all in native-endian format
Definition: samplefmt.h:27
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:52
void * priv_data
Definition: avcodec.h:1531
int len
int channels
number of audio channels
Definition: avcodec.h:1457
WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]
Definition: wma.h:119
static const CoefVLCTable coef_vlcs[6]
Definition: wmadata.h:1382
float max_exponent[MAX_CHANNELS]
Definition: wma.h:118
int coefs_start
first coded coef
Definition: wma.h:85
int block_len_bits
log2 of current block length
Definition: wma.h:108
#define AV_WL16(p, d)
Definition: intreadwrite.h:225
#define CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:649
int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]
Definition: wma.h:92
int ff_wma_init(AVCodecContext *avctx, int flags2)
Definition: wma.c:110
const CoefVLCTable * coef_vlcs[2]
Definition: wma.h:101
PutBitContext pb
Definition: wma.h:70