Libav
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 "libavutil/attributes.h"
23 #include "avcodec.h"
24 #include "internal.h"
25 #include "wma.h"
26 
27 #undef NDEBUG
28 #include <assert.h>
29 
30 
32 {
33  WMACodecContext *s = avctx->priv_data;
34  int i, flags1, flags2, block_align;
35  uint8_t *extradata;
36 
37  s->avctx = avctx;
38 
39  if(avctx->channels > MAX_CHANNELS) {
40  av_log(avctx, AV_LOG_ERROR, "too many channels: got %i, need %i or fewer",
41  avctx->channels, MAX_CHANNELS);
42  return AVERROR(EINVAL);
43  }
44 
45  if (avctx->sample_rate > 48000) {
46  av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz",
47  avctx->sample_rate);
48  return AVERROR(EINVAL);
49  }
50 
51  if(avctx->bit_rate < 24*1000) {
52  av_log(avctx, AV_LOG_ERROR, "bitrate too low: got %i, need 24000 or higher\n",
53  avctx->bit_rate);
54  return AVERROR(EINVAL);
55  }
56 
57  /* extract flag infos */
58  flags1 = 0;
59  flags2 = 1;
60  if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
61  extradata= av_malloc(4);
62  avctx->extradata_size= 4;
63  AV_WL16(extradata, flags1);
64  AV_WL16(extradata+2, flags2);
65  } else if (avctx->codec->id == AV_CODEC_ID_WMAV2) {
66  extradata= av_mallocz(10);
67  avctx->extradata_size= 10;
68  AV_WL32(extradata, flags1);
69  AV_WL16(extradata+4, flags2);
70  }else
71  assert(0);
72  avctx->extradata= extradata;
73  s->use_exp_vlc = flags2 & 0x0001;
74  s->use_bit_reservoir = flags2 & 0x0002;
75  s->use_variable_block_len = flags2 & 0x0004;
76  if (avctx->channels == 2)
77  s->ms_stereo = 1;
78 
79  ff_wma_init(avctx, flags2);
80 
81  /* init MDCT */
82  for(i = 0; i < s->nb_block_sizes; i++)
83  ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0);
84 
85  block_align = avctx->bit_rate * (int64_t)s->frame_len /
86  (avctx->sample_rate * 8);
87  block_align = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE);
88  avctx->block_align = block_align;
89  avctx->bit_rate = avctx->block_align * 8LL * avctx->sample_rate /
90  s->frame_len;
91  avctx->frame_size = avctx->delay = s->frame_len;
92 
93  return 0;
94 }
95 
96 
97 static void apply_window_and_mdct(AVCodecContext * avctx, const AVFrame *frame)
98 {
99  WMACodecContext *s = avctx->priv_data;
100  float **audio = (float **)frame->extended_data;
101  int len = frame->nb_samples;
102  int window_index= s->frame_len_bits - s->block_len_bits;
103  FFTContext *mdct = &s->mdct_ctx[window_index];
104  int ch;
105  const float * win = s->windows[window_index];
106  int window_len = 1 << s->block_len_bits;
107  float n = 2.0 * 32768.0 / window_len;
108 
109  for (ch = 0; ch < avctx->channels; ch++) {
110  memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
111  s->fdsp.vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
112  s->fdsp.vector_fmul_reverse(&s->output[window_len], s->frame_out[ch], win, len);
113  s->fdsp.vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
114  mdct->mdct_calc(mdct, s->coefs[ch], s->output);
115  }
116 }
117 
118 //FIXME use for decoding too
119 static void init_exp(WMACodecContext *s, int ch, const int *exp_param){
120  int n;
121  const uint16_t *ptr;
122  float v, *q, max_scale, *q_end;
123 
124  ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
125  q = s->exponents[ch];
126  q_end = q + s->block_len;
127  max_scale = 0;
128  while (q < q_end) {
129  /* XXX: use a table */
130  v = pow(10, *exp_param++ * (1.0 / 16.0));
131  max_scale= FFMAX(max_scale, v);
132  n = *ptr++;
133  do {
134  *q++ = v;
135  } while (--n);
136  }
137  s->max_exponent[ch] = max_scale;
138 }
139 
140 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param){
141  int last_exp;
142  const uint16_t *ptr;
143  float *q, *q_end;
144 
145  ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
146  q = s->exponents[ch];
147  q_end = q + s->block_len;
148  if (s->version == 1) {
149  last_exp= *exp_param++;
150  assert(last_exp-10 >= 0 && last_exp-10 < 32);
151  put_bits(&s->pb, 5, last_exp - 10);
152  q+= *ptr++;
153  }else
154  last_exp = 36;
155  while (q < q_end) {
156  int exp = *exp_param++;
157  int code = exp - last_exp + 60;
158  assert(code >= 0 && code < 120);
160  /* XXX: use a table */
161  q+= *ptr++;
162  last_exp= exp;
163  }
164 }
165 
166 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], int total_gain){
167  int v, bsize, ch, coef_nb_bits, parse_exponents;
168  float mdct_norm;
169  int nb_coefs[MAX_CHANNELS];
170  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};
171 
172  //FIXME remove duplication relative to decoder
173  if (s->use_variable_block_len) {
174  assert(0); //FIXME not implemented
175  }else{
176  /* fixed block len */
180  }
181 
182  s->block_len = 1 << s->block_len_bits;
183 // assert((s->block_pos + s->block_len) <= s->frame_len);
184  bsize = s->frame_len_bits - s->block_len_bits;
185 
186  //FIXME factor
187  v = s->coefs_end[bsize] - s->coefs_start;
188  for (ch = 0; ch < s->avctx->channels; ch++)
189  nb_coefs[ch] = v;
190  {
191  int n4 = s->block_len / 2;
192  mdct_norm = 1.0 / (float)n4;
193  if (s->version == 1) {
194  mdct_norm *= sqrt(n4);
195  }
196  }
197 
198  if (s->avctx->channels == 2) {
199  put_bits(&s->pb, 1, !!s->ms_stereo);
200  }
201 
202  for (ch = 0; ch < s->avctx->channels; ch++) {
203  s->channel_coded[ch] = 1; //FIXME only set channel_coded when needed, instead of always
204  if (s->channel_coded[ch]) {
205  init_exp(s, ch, fixed_exp);
206  }
207  }
208 
209  for (ch = 0; ch < s->avctx->channels; ch++) {
210  if (s->channel_coded[ch]) {
211  WMACoef *coefs1;
212  float *coefs, *exponents, mult;
213  int i, n;
214 
215  coefs1 = s->coefs1[ch];
216  exponents = s->exponents[ch];
217  mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
218  mult *= mdct_norm;
219  coefs = src_coefs[ch];
220  if (s->use_noise_coding && 0) {
221  assert(0); //FIXME not implemented
222  } else {
223  coefs += s->coefs_start;
224  n = nb_coefs[ch];
225  for(i = 0;i < n; i++){
226  double t= *coefs++ / (exponents[i] * mult);
227  if(t<-32768 || t>32767)
228  return -1;
229 
230  coefs1[i] = lrint(t);
231  }
232  }
233  }
234  }
235 
236  v = 0;
237  for (ch = 0; ch < s->avctx->channels; ch++) {
238  int a = s->channel_coded[ch];
239  put_bits(&s->pb, 1, a);
240  v |= a;
241  }
242 
243  if (!v)
244  return 1;
245 
246  for(v= total_gain-1; v>=127; v-= 127)
247  put_bits(&s->pb, 7, 127);
248  put_bits(&s->pb, 7, v);
249 
250  coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
251 
252  if (s->use_noise_coding) {
253  for (ch = 0; ch < s->avctx->channels; ch++) {
254  if (s->channel_coded[ch]) {
255  int i, n;
256  n = s->exponent_high_sizes[bsize];
257  for(i=0;i<n;i++) {
258  put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0);
259  if (0)
260  nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
261  }
262  }
263  }
264  }
265 
266  parse_exponents = 1;
267  if (s->block_len_bits != s->frame_len_bits) {
268  put_bits(&s->pb, 1, parse_exponents);
269  }
270 
271  if (parse_exponents) {
272  for (ch = 0; ch < s->avctx->channels; ch++) {
273  if (s->channel_coded[ch]) {
274  if (s->use_exp_vlc) {
275  encode_exp_vlc(s, ch, fixed_exp);
276  } else {
277  assert(0); //FIXME not implemented
278 // encode_exp_lsp(s, ch);
279  }
280  }
281  }
282  } else {
283  assert(0); //FIXME not implemented
284  }
285 
286  for (ch = 0; ch < s->avctx->channels; ch++) {
287  if (s->channel_coded[ch]) {
288  int run, tindex;
289  WMACoef *ptr, *eptr;
290  tindex = (ch == 1 && s->ms_stereo);
291  ptr = &s->coefs1[ch][0];
292  eptr = ptr + nb_coefs[ch];
293 
294  run=0;
295  for(;ptr < eptr; ptr++){
296  if(*ptr){
297  int level= *ptr;
298  int abs_level= FFABS(level);
299  int code= 0;
300  if(abs_level <= s->coef_vlcs[tindex]->max_level){
301  if(run < s->coef_vlcs[tindex]->levels[abs_level-1])
302  code= run + s->int_table[tindex][abs_level-1];
303  }
304 
305  assert(code < s->coef_vlcs[tindex]->n);
306  put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]);
307 
308  if(code == 0){
309  if(1<<coef_nb_bits <= abs_level)
310  return -1;
311 
312  put_bits(&s->pb, coef_nb_bits, abs_level);
313  put_bits(&s->pb, s->frame_len_bits, run);
314  }
315  put_bits(&s->pb, 1, level < 0); //FIXME the sign is fliped somewhere
316  run=0;
317  }else{
318  run++;
319  }
320  }
321  if(run)
322  put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]);
323  }
324  if (s->version == 1 && s->avctx->channels >= 2) {
326  }
327  }
328  return 0;
329 }
330 
331 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain){
332  init_put_bits(&s->pb, buf, buf_size);
333 
334  if (s->use_bit_reservoir) {
335  assert(0);//FIXME not implemented
336  }else{
337  if(encode_block(s, src_coefs, total_gain) < 0)
338  return INT_MAX;
339  }
340 
342 
343  return put_bits_count(&s->pb) / 8 - s->avctx->block_align;
344 }
345 
346 static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt,
347  const AVFrame *frame, int *got_packet_ptr)
348 {
349  WMACodecContext *s = avctx->priv_data;
350  int i, total_gain, ret;
351 
352  s->block_len_bits= s->frame_len_bits; //required by non variable block len
353  s->block_len = 1 << s->block_len_bits;
354 
355  apply_window_and_mdct(avctx, frame);
356 
357  if (s->ms_stereo) {
358  float a, b;
359  int i;
360 
361  for(i = 0; i < s->block_len; i++) {
362  a = s->coefs[0][i]*0.5;
363  b = s->coefs[1][i]*0.5;
364  s->coefs[0][i] = a + b;
365  s->coefs[1][i] = a - b;
366  }
367  }
368 
369  if ((ret = ff_alloc_packet(avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE))) {
370  av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
371  return ret;
372  }
373 
374 #if 1
375  total_gain= 128;
376  for(i=64; i; i>>=1){
377  int error = encode_frame(s, s->coefs, avpkt->data, avpkt->size,
378  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, avpkt->data, avpkt->size, total_gain);
385  for(i=32; i; i>>=1){
386  int scoreL = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain - i);
387  int scoreR = encode_frame(s, s->coefs, avpkt->data, avpkt->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  if ((i = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain)) >= 0) {
400  av_log(avctx, AV_LOG_ERROR, "required frame size too large. please "
401  "use a higher bit rate.\n");
402  return AVERROR(EINVAL);
403  }
404  assert((put_bits_count(&s->pb) & 7) == 0);
405  while (i++)
406  put_bits(&s->pb, 8, 'N');
407 
408  flush_put_bits(&s->pb);
409 
410  if (frame->pts != AV_NOPTS_VALUE)
411  avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->delay);
412 
413  avpkt->size = avctx->block_align;
414  *got_packet_ptr = 1;
415  return 0;
416 }
417 
419  .name = "wmav1",
420  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
421  .type = AVMEDIA_TYPE_AUDIO,
422  .id = AV_CODEC_ID_WMAV1,
423  .priv_data_size = sizeof(WMACodecContext),
424  .init = encode_init,
425  .encode2 = encode_superframe,
426  .close = ff_wma_end,
427  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
429 };
430 
432  .name = "wmav2",
433  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
434  .type = AVMEDIA_TYPE_AUDIO,
435  .id = AV_CODEC_ID_WMAV2,
436  .priv_data_size = sizeof(WMACodecContext),
437  .init = encode_init,
438  .encode2 = encode_superframe,
439  .close = ff_wma_end,
440  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
442 };
float, planar
Definition: samplefmt.h:72
const struct AVCodec * codec
Definition: avcodec.h:1059
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:62
static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: wmaenc.c:346
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int next_block_len_bits
log2 of next block length
Definition: wma.h:104
#define BLOCK_MAX_SIZE
Definition: wma.h:34
int size
Definition: avcodec.h:974
void avpriv_align_put_bits(PutBitContext *s)
Pad the bitstream with zeros up to the next byte boundary.
Definition: bitstream.c:45
int block_len
block length in samples
Definition: wma.h:106
const uint8_t * huffbits
VLC bit size.
Definition: wma.h:62
void(* vector_fmul_reverse)(float *dst, const float *src0, const float *src1, int len)
Calculate the product of two vectors of floats, and store the result in a vector of floats...
Definition: float_dsp.h:138
uint8_t run
Definition: svq3.c:146
float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]
Definition: wma.h:112
AVCodec.
Definition: avcodec.h:2812
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1844
Macro definitions for various function/variable attributes.
uint8_t
#define av_cold
Definition: attributes.h:66
float WMACoef
type for decoded coefficients, int16_t would be enough for wma 1/2
Definition: wma.h:56
#define b
Definition: input.c:52
#define AV_WL32(p, d)
Definition: intreadwrite.h:255
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:211
const uint8_t ff_aac_scalefactor_bits[121]
Definition: aactab.c:74
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
const uint32_t * huffcodes
VLC bit values.
Definition: wma.h:61
uint8_t * data
Definition: avcodec.h:973
static int encode_frame(WMACodecContext *s, float(*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain)
Definition: wmaenc.c:331
int nb_block_sizes
number of block sizes
Definition: wma.h:100
int ff_wma_total_gain_to_bits(int total_gain)
Definition: wma.c:360
uint16_t * int_table[2]
Definition: wma.h:95
enum AVCodecID id
Definition: avcodec.h:2826
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param)
Definition: wmaenc.c:140
void(* vector_fmul)(float *dst, const float *src0, const float *src1, int len)
Calculate the product of two vectors of floats and store the result in a vector of floats...
Definition: float_dsp.h:38
#define AVERROR(e)
Definition: error.h:43
sample_fmts
Definition: avconv_filter.c:68
uint16_t exponent_bands[BLOCK_NB_SIZES][25]
Definition: wma.h:78
uint8_t channel_coded[MAX_CHANNELS]
true if channel is coded
Definition: wma.h:110
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
static void apply_window_and_mdct(AVCodecContext *avctx, const AVFrame *frame)
Definition: wmaenc.c:97
AVFloatDSPContext fdsp
Definition: wma.h:134
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
const char * name
Name of the codec implementation.
Definition: avcodec.h:2819
static void put_bits(PutBitContext *s, int n, unsigned int value)
Write up to 31 bits into a bitstream.
Definition: put_bits.h:134
FFTSample output[BLOCK_MAX_SIZE *2]
Definition: wma.h:116
#define ff_mdct_init
Definition: fft.h:151
#define FFMAX(a, b)
Definition: common.h:55
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:67
int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]
Definition: wma.h:83
int ff_wma_end(AVCodecContext *avctx)
Definition: wma.c:369
Definition: fft.h:73
int bit_rate
the average bitrate
Definition: avcodec.h:1114
#define FFMIN(a, b)
Definition: common.h:57
int use_bit_reservoir
Definition: wma.h:71
float * windows[BLOCK_NB_SIZES]
Definition: wma.h:118
#define MAX_CODED_SUPERFRAME_SIZE
Definition: wma.h:44
av_cold int ff_wma_init(AVCodecContext *avctx, int flags2)
Definition: wma.c:72
#define FFABS(a)
Definition: common.h:52
int version
1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
Definition: wma.h:70
int ff_alloc_packet(AVPacket *avpkt, int size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1266
void(* vector_fmul_scalar)(float *dst, const float *src, float mul, int len)
Multiply a vector of floats by a scalar float.
Definition: float_dsp.h:69
int frame_len
frame length in samples
Definition: wma.h:98
static void init_exp(WMACodecContext *s, int ch, const int *exp_param)
Definition: wmaenc.c:119
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1827
NULL
Definition: eval.c:55
int frame_len_bits
frame_len = 1 << frame_len_bits
Definition: wma.h:99
Libavcodec external API header.
AVSampleFormat
Audio Sample Formats.
Definition: samplefmt.h:61
AV_SAMPLE_FMT_NONE
Definition: avconv_filter.c:68
int sample_rate
samples per second
Definition: avcodec.h:1807
int use_exp_vlc
exponent coding: 0 = lsp, 1 = vlc + delta
Definition: wma.h:73
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
AVCodecContext * avctx
Definition: wma.h:67
float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE *2]
Definition: wma.h:120
static int16_t mult(Float11 *f1, Float11 *f2)
Definition: g726.c:55
int extradata_size
Definition: avcodec.h:1165
int exponent_high_sizes[BLOCK_NB_SIZES]
Definition: wma.h:82
int use_noise_coding
true if perceptual noise is added
Definition: wma.h:74
AVCodec ff_wmav1_encoder
Definition: wmaenc.c:418
static av_always_inline av_const long int lrint(double x)
Definition: libm.h:137
#define MAX_CHANNELS
Definition: aac.h:42
int use_variable_block_len
Definition: wma.h:72
uint8_t ms_stereo
true if mid/side stereo mode
Definition: wma.h:109
static av_cold int encode_init(AVCodecContext *avctx)
Definition: wmaenc.c:31
FFTContext mdct_ctx[BLOCK_NB_SIZES]
Definition: wma.h:117
const uint32_t ff_aac_scalefactor_code[121]
Definition: aactab.c:55
AVCodec ff_wmav2_encoder
Definition: wmaenc.c:431
float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]
Definition: wma.h:115
uint8_t level
Definition: svq3.c:147
int prev_block_len_bits
log2 of prev block length
Definition: wma.h:105
static int encode_block(WMACodecContext *s, float(*src_coefs)[BLOCK_MAX_SIZE], int total_gain)
Definition: wmaenc.c:166
int coefs_end[BLOCK_NB_SIZES]
max number of coded coefficients
Definition: wma.h:81
common internal api header.
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:83
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1092
int len
int channels
number of audio channels
Definition: avcodec.h:1808
WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]
Definition: wma.h:114
static const CoefVLCTable coef_vlcs[6]
Definition: wmadata.h:1382
float max_exponent[MAX_CHANNELS]
Definition: wma.h:113
int coefs_start
first coded coef
Definition: wma.h:80
static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx, int64_t samples)
Rescale from sample rate to AVCodecContext.time_base.
Definition: internal.h:151
int block_len_bits
log2 of current block length
Definition: wma.h:103
#define AV_WL16(p, d)
Definition: intreadwrite.h:225
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:169
This structure stores compressed data.
Definition: avcodec.h:950
int delay
Codec delay.
Definition: avcodec.h:1212
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:179
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:205
int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]
Definition: wma.h:87
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:966
for(j=16;j >0;--j)
const CoefVLCTable * coef_vlcs[2]
Definition: wma.h:96
PutBitContext pb
Definition: wma.h:69
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:228