FFmpeg
wmaenc.c
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1 /*
2  * WMA compatible encoder
3  * Copyright (c) 2007 Michael Niedermayer
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "config_components.h"
23 
24 #include "libavutil/attributes.h"
25 #include "libavutil/ffmath.h"
26 
27 #include "avcodec.h"
28 #include "codec_internal.h"
29 #include "encode.h"
30 #include "internal.h"
31 #include "wma.h"
32 #include "libavutil/avassert.h"
33 
34 
36 {
37  WMACodecContext *s = avctx->priv_data;
38  int i, flags1, flags2, block_align;
39  uint8_t *extradata;
40  int ret;
41 
42  s->avctx = avctx;
43 
44  if (avctx->ch_layout.nb_channels > MAX_CHANNELS) {
45  av_log(avctx, AV_LOG_ERROR,
46  "too many channels: got %i, need %i or fewer\n",
48  return AVERROR(EINVAL);
49  }
50 
51  if (avctx->sample_rate > 48000) {
52  av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz\n",
53  avctx->sample_rate);
54  return AVERROR(EINVAL);
55  }
56 
57  if (avctx->bit_rate < 24 * 1000) {
58  av_log(avctx, AV_LOG_ERROR,
59  "bitrate too low: got %"PRId64", need 24000 or higher\n",
60  avctx->bit_rate);
61  return AVERROR(EINVAL);
62  }
63 
64  /* extract flag info */
65  flags1 = 0;
66  flags2 = 1;
67  if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
68  extradata = av_malloc(4);
69  if (!extradata)
70  return AVERROR(ENOMEM);
71  avctx->extradata_size = 4;
72  AV_WL16(extradata, flags1);
73  AV_WL16(extradata + 2, flags2);
74  } else if (avctx->codec->id == AV_CODEC_ID_WMAV2) {
75  extradata = av_mallocz(10);
76  if (!extradata)
77  return AVERROR(ENOMEM);
78  avctx->extradata_size = 10;
79  AV_WL32(extradata, flags1);
80  AV_WL16(extradata + 4, flags2);
81  } else {
82  av_assert0(0);
83  }
84  avctx->extradata = extradata;
85  s->use_exp_vlc = flags2 & 0x0001;
86  s->use_bit_reservoir = flags2 & 0x0002;
87  s->use_variable_block_len = flags2 & 0x0004;
88  if (avctx->ch_layout.nb_channels == 2)
89  s->ms_stereo = 1;
90 
91  if ((ret = ff_wma_init(avctx, flags2)) < 0)
92  return ret;
93 
94  /* init MDCT */
95  for (i = 0; i < s->nb_block_sizes; i++) {
96  ret = ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0);
97  if (ret < 0)
98  return ret;
99  }
100 
101  block_align = avctx->bit_rate * (int64_t) s->frame_len /
102  (avctx->sample_rate * 8);
103  block_align = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE);
104  avctx->block_align = block_align;
105  avctx->frame_size = avctx->initial_padding = s->frame_len;
106 
107  return 0;
108 }
109 
111 {
112  WMACodecContext *s = avctx->priv_data;
113  const float *const *audio = (const float *const *) frame->extended_data;
114  int len = frame->nb_samples;
115  int window_index = s->frame_len_bits - s->block_len_bits;
116  FFTContext *mdct = &s->mdct_ctx[window_index];
117  int ch;
118  const float *win = s->windows[window_index];
119  int window_len = 1 << s->block_len_bits;
120  float n = 2.0 * 32768.0 / window_len;
121 
122  for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
123  memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
124  s->fdsp->vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
125  s->fdsp->vector_fmul_reverse(&s->output[window_len], s->frame_out[ch],
126  win, len);
127  s->fdsp->vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
128  mdct->mdct_calc(mdct, s->coefs[ch], s->output);
129  if (!isfinite(s->coefs[ch][0])) {
130  av_log(avctx, AV_LOG_ERROR, "Input contains NaN/+-Inf\n");
131  return AVERROR(EINVAL);
132  }
133  }
134 
135  return 0;
136 }
137 
138 // FIXME use for decoding too
139 static void init_exp(WMACodecContext *s, int ch, const int *exp_param)
140 {
141  int n;
142  const uint16_t *ptr;
143  float v, *q, max_scale, *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  max_scale = 0;
149  while (q < q_end) {
150  /* XXX: use a table */
151  v = ff_exp10(*exp_param++ *(1.0 / 16.0));
152  max_scale = FFMAX(max_scale, v);
153  n = *ptr++;
154  do {
155  *q++ = v;
156  } while (--n);
157  }
158  s->max_exponent[ch] = max_scale;
159 }
160 
161 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param)
162 {
163  int last_exp;
164  const uint16_t *ptr;
165  float *q, *q_end;
166 
167  ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
168  q = s->exponents[ch];
169  q_end = q + s->block_len;
170  if (s->version == 1) {
171  last_exp = *exp_param++;
172  av_assert0(last_exp - 10 >= 0 && last_exp - 10 < 32);
173  put_bits(&s->pb, 5, last_exp - 10);
174  q += *ptr++;
175  } else
176  last_exp = 36;
177  while (q < q_end) {
178  int exp = *exp_param++;
179  int code = exp - last_exp + 60;
180  av_assert1(code >= 0 && code < 120);
183  /* XXX: use a table */
184  q += *ptr++;
185  last_exp = exp;
186  }
187 }
188 
189 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
190  int total_gain)
191 {
192  int channels = s->avctx->ch_layout.nb_channels;
193  int v, bsize, ch, coef_nb_bits, parse_exponents;
194  float mdct_norm;
195  int nb_coefs[MAX_CHANNELS];
196  static const int fixed_exp[25] = {
197  20, 20, 20, 20, 20,
198  20, 20, 20, 20, 20,
199  20, 20, 20, 20, 20,
200  20, 20, 20, 20, 20,
201  20, 20, 20, 20, 20
202  };
203 
204  // FIXME remove duplication relative to decoder
205  if (s->use_variable_block_len) {
206  av_assert0(0); // FIXME not implemented
207  } else {
208  /* fixed block len */
209  s->next_block_len_bits = s->frame_len_bits;
210  s->prev_block_len_bits = s->frame_len_bits;
211  s->block_len_bits = s->frame_len_bits;
212  }
213 
214  s->block_len = 1 << s->block_len_bits;
215 // av_assert0((s->block_pos + s->block_len) <= s->frame_len);
216  bsize = s->frame_len_bits - s->block_len_bits;
217 
218  // FIXME factor
219  v = s->coefs_end[bsize] - s->coefs_start;
220  for (ch = 0; ch < channels; ch++)
221  nb_coefs[ch] = v;
222  {
223  int n4 = s->block_len / 2;
224  mdct_norm = 1.0 / (float) n4;
225  if (s->version == 1)
226  mdct_norm *= sqrt(n4);
227  }
228 
229  if (channels == 2)
230  put_bits(&s->pb, 1, !!s->ms_stereo);
231 
232  for (ch = 0; ch < channels; ch++) {
233  // FIXME only set channel_coded when needed, instead of always
234  s->channel_coded[ch] = 1;
235  if (s->channel_coded[ch])
236  init_exp(s, ch, fixed_exp);
237  }
238 
239  for (ch = 0; ch < channels; ch++) {
240  if (s->channel_coded[ch]) {
241  WMACoef *coefs1;
242  float *coefs, *exponents, mult;
243  int i, n;
244 
245  coefs1 = s->coefs1[ch];
246  exponents = s->exponents[ch];
247  mult = ff_exp10(total_gain * 0.05) / s->max_exponent[ch];
248  mult *= mdct_norm;
249  coefs = src_coefs[ch];
250  if (s->use_noise_coding && 0) {
251  av_assert0(0); // FIXME not implemented
252  } else {
253  coefs += s->coefs_start;
254  n = nb_coefs[ch];
255  for (i = 0; i < n; i++) {
256  double t = *coefs++ / (exponents[i] * mult);
257  if (t < -32768 || t > 32767)
258  return -1;
259 
260  coefs1[i] = lrint(t);
261  }
262  }
263  }
264  }
265 
266  v = 0;
267  for (ch = 0; ch < channels; ch++) {
268  int a = s->channel_coded[ch];
269  put_bits(&s->pb, 1, a);
270  v |= a;
271  }
272 
273  if (!v)
274  return 1;
275 
276  for (v = total_gain - 1; v >= 127; v -= 127)
277  put_bits(&s->pb, 7, 127);
278  put_bits(&s->pb, 7, v);
279 
280  coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
281 
282  if (s->use_noise_coding) {
283  for (ch = 0; ch < channels; ch++) {
284  if (s->channel_coded[ch]) {
285  int i, n;
286  n = s->exponent_high_sizes[bsize];
287  for (i = 0; i < n; i++) {
288  put_bits(&s->pb, 1, s->high_band_coded[ch][i] = 0);
289  if (0)
290  nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
291  }
292  }
293  }
294  }
295 
296  parse_exponents = 1;
297  if (s->block_len_bits != s->frame_len_bits)
298  put_bits(&s->pb, 1, parse_exponents);
299 
300  if (parse_exponents) {
301  for (ch = 0; ch < channels; ch++) {
302  if (s->channel_coded[ch]) {
303  if (s->use_exp_vlc) {
304  encode_exp_vlc(s, ch, fixed_exp);
305  } else {
306  av_assert0(0); // FIXME not implemented
307 // encode_exp_lsp(s, ch);
308  }
309  }
310  }
311  } else
312  av_assert0(0); // FIXME not implemented
313 
314  for (ch = 0; ch < channels; ch++) {
315  if (s->channel_coded[ch]) {
316  int run, tindex;
317  WMACoef *ptr, *eptr;
318  tindex = (ch == 1 && s->ms_stereo);
319  ptr = &s->coefs1[ch][0];
320  eptr = ptr + nb_coefs[ch];
321 
322  run = 0;
323  for (; ptr < eptr; ptr++) {
324  if (*ptr) {
325  int level = *ptr;
326  int abs_level = FFABS(level);
327  int code = 0;
328  if (abs_level <= s->coef_vlcs[tindex]->max_level)
329  if (run < s->coef_vlcs[tindex]->levels[abs_level - 1])
330  code = run + s->int_table[tindex][abs_level - 1];
331 
332  av_assert2(code < s->coef_vlcs[tindex]->n);
333  put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code],
334  s->coef_vlcs[tindex]->huffcodes[code]);
335 
336  if (code == 0) {
337  if (1 << coef_nb_bits <= abs_level)
338  return -1;
339 
340  put_bits(&s->pb, coef_nb_bits, abs_level);
341  put_bits(&s->pb, s->frame_len_bits, run);
342  }
343  // FIXME the sign is flipped somewhere
344  put_bits(&s->pb, 1, level < 0);
345  run = 0;
346  } else
347  run++;
348  }
349  if (run)
350  put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1],
351  s->coef_vlcs[tindex]->huffcodes[1]);
352  }
353  if (s->version == 1 && channels >= 2)
354  align_put_bits(&s->pb);
355  }
356  return 0;
357 }
358 
359 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
360  uint8_t *buf, int buf_size, int total_gain)
361 {
362  init_put_bits(&s->pb, buf, buf_size);
363 
364  if (s->use_bit_reservoir)
365  av_assert0(0); // FIXME not implemented
366  else if (encode_block(s, src_coefs, total_gain) < 0)
367  return INT_MAX;
368 
369  align_put_bits(&s->pb);
370 
371  return put_bits_count(&s->pb) / 8 - s->avctx->block_align;
372 }
373 
374 static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt,
375  const AVFrame *frame, int *got_packet_ptr)
376 {
377  WMACodecContext *s = avctx->priv_data;
378  int i, total_gain, ret, error;
379 
380  s->block_len_bits = s->frame_len_bits; // required by non variable block len
381  s->block_len = 1 << s->block_len_bits;
382 
383  ret = apply_window_and_mdct(avctx, frame);
384 
385  if (ret < 0)
386  return ret;
387 
388  if (s->ms_stereo) {
389  float a, b;
390  int i;
391 
392  for (i = 0; i < s->block_len; i++) {
393  a = s->coefs[0][i] * 0.5;
394  b = s->coefs[1][i] * 0.5;
395  s->coefs[0][i] = a + b;
396  s->coefs[1][i] = a - b;
397  }
398  }
399 
400  if ((ret = ff_alloc_packet(avctx, avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE)) < 0)
401  return ret;
402 
403  total_gain = 128;
404  for (i = 64; i; i >>= 1) {
405  error = encode_frame(s, s->coefs, avpkt->data, avpkt->size,
406  total_gain - i);
407  if (error <= 0)
408  total_gain -= i;
409  }
410 
411  while(total_gain <= 128 && error > 0)
412  error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain++);
413  if (error > 0) {
414  av_log(avctx, AV_LOG_ERROR, "Invalid input data or requested bitrate too low, cannot encode\n");
415  avpkt->size = 0;
416  return AVERROR(EINVAL);
417  }
418  av_assert0((put_bits_count(&s->pb) & 7) == 0);
419  i = avctx->block_align - put_bytes_count(&s->pb, 0);
420  av_assert0(i>=0);
421  while(i--)
422  put_bits(&s->pb, 8, 'N');
423 
424  flush_put_bits(&s->pb);
425  av_assert0(put_bits_ptr(&s->pb) - s->pb.buf == avctx->block_align);
426 
427  if (frame->pts != AV_NOPTS_VALUE)
428  avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
429 
430  avpkt->size = avctx->block_align;
431  *got_packet_ptr = 1;
432  return 0;
433 }
434 
435 #if CONFIG_WMAV1_ENCODER
436 const FFCodec ff_wmav1_encoder = {
437  .p.name = "wmav1",
438  .p.long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
439  .p.type = AVMEDIA_TYPE_AUDIO,
440  .p.id = AV_CODEC_ID_WMAV1,
441  .priv_data_size = sizeof(WMACodecContext),
442  .init = encode_init,
444  .close = ff_wma_end,
445  .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
447  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
448 };
449 #endif
450 #if CONFIG_WMAV2_ENCODER
451 const FFCodec ff_wmav2_encoder = {
452  .p.name = "wmav2",
453  .p.long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
454  .p.type = AVMEDIA_TYPE_AUDIO,
455  .p.id = AV_CODEC_ID_WMAV2,
456  .priv_data_size = sizeof(WMACodecContext),
457  .init = encode_init,
459  .close = ff_wma_end,
460  .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
462  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
463 };
464 #endif
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:31
AVCodecContext::frame_size
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1035
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:66
nb_coefs
static int nb_coefs(int length, int level, uint64_t sn)
Definition: af_afwtdn.c:515
ff_exp10
static av_always_inline double ff_exp10(double x)
Compute 10^x for floating point values.
Definition: ffmath.h:42
level
uint8_t level
Definition: svq3.c:206
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: codec_internal.h:41
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
AV_WL32
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
align_put_bits
static void align_put_bits(PutBitContext *s)
Pad the bitstream with zeros up to the next byte boundary.
Definition: put_bits.h:413
coef_vlcs
static const CoefVLCTable coef_vlcs[6]
Definition: wmadata.h:1371
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1007
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:62
apply_window_and_mdct
static int apply_window_and_mdct(AVCodecContext *avctx, const AVFrame *frame)
Definition: wmaenc.c:110
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:221
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:374
encode.h
b
#define b
Definition: input.c:34
put_bytes_count
static int put_bytes_count(const PutBitContext *s, int round_up)
Definition: put_bits.h:100
init_exp
static void init_exp(WMACodecContext *s, int ch, const int *exp_param)
Definition: wmaenc.c:139
ff_mdct_init
#define ff_mdct_init
Definition: fft.h:153
FFCodec
Definition: codec_internal.h:118
AV_CODEC_ID_WMAV2
@ AV_CODEC_ID_WMAV2
Definition: codec_id.h:437
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:300
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
win
static float win(SuperEqualizerContext *s, float n, int N)
Definition: af_superequalizer.c:119
init
static int init
Definition: av_tx.c:47
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:122
AVCodecContext::codec
const struct AVCodec * codec
Definition: avcodec.h:407
WMACoef
float WMACoef
type for decoded coefficients, int16_t would be enough for wma 1/2
Definition: wma.h:58
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:2065
encode_block
static int encode_block(WMACodecContext *s, float(*src_coefs)[BLOCK_MAX_SIZE], int total_gain)
Definition: wmaenc.c:189
AVCodecContext::initial_padding
int initial_padding
Audio only.
Definition: avcodec.h:1732
FF_CODEC_ENCODE_CB
#define FF_CODEC_ENCODE_CB(func)
Definition: codec_internal.h:269
WMACodecContext
Definition: wma.h:68
encode_init
static av_cold int encode_init(AVCodecContext *avctx)
Definition: wmaenc.c:35
mult
static int16_t mult(Float11 *f1, Float11 *f2)
Definition: g726.c:60
AV_CODEC_ID_WMAV1
@ AV_CODEC_ID_WMAV1
Definition: codec_id.h:436
avassert.h
lrint
#define lrint
Definition: tablegen.h:53
ff_samples_to_time_base
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:187
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
float
float
Definition: af_crystalizer.c:122
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:500
s
#define s(width, name)
Definition: cbs_vp9.c:256
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
BLOCK_MAX_SIZE
#define BLOCK_MAX_SIZE
Definition: wma.h:36
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
channels
channels
Definition: aptx.h:32
isfinite
#define isfinite(x)
Definition: libm.h:359
wma.h
ff_wma_total_gain_to_bits
int ff_wma_total_gain_to_bits(int total_gain)
Definition: wma.c:352
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:64
ff_wmav1_encoder
const FFCodec ff_wmav1_encoder
run
uint8_t run
Definition: svq3.c:205
parse_exponents
static int parse_exponents(DBEContext *s, DBEChannel *c)
Definition: dolby_e.c:662
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:448
ff_wmav2_encoder
const FFCodec ff_wmav2_encoder
encode_superframe
static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: wmaenc.c:374
exp
int8_t exp
Definition: eval.c:72
MAX_CODED_SUPERFRAME_SIZE
#define MAX_CODED_SUPERFRAME_SIZE
Definition: wma.h:46
ff_wma_end
int ff_wma_end(AVCodecContext *avctx)
Definition: wma.c:366
ff_aac_scalefactor_bits
const uint8_t ff_aac_scalefactor_bits[121]
Definition: aactab.c:111
AVPacket::size
int size
Definition: packet.h:375
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:117
codec_internal.h
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
ff_wma_init
av_cold int ff_wma_init(AVCodecContext *avctx, int flags2)
Definition: wma.c:78
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
fixed_exp
static int fixed_exp(int x)
Definition: aacsbr_fixed.c:111
attributes.h
MAX_CHANNELS
#define MAX_CHANNELS
Definition: aac.h:49
AVCodec::id
enum AVCodecID id
Definition: codec.h:218
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
FFTContext
Definition: fft.h:75
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:367
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:80
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:499
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:264
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
len
int len
Definition: vorbis_enc_data.h:426
avcodec.h
ret
ret
Definition: filter_design.txt:187
encode_frame
static int encode_frame(WMACodecContext *s, float(*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain)
Definition: wmaenc.c:359
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:1052
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
AVCodecContext
main external API structure.
Definition: avcodec.h:398
put_bits_ptr
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:370
encode_exp_vlc
static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param)
Definition: wmaenc.c:161
ffmath.h
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:143
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
ff_alloc_packet
int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)
Check AVPacket size and allocate data.
Definition: encode.c:35
ff_aac_scalefactor_code
const uint32_t ff_aac_scalefactor_code[121]
Definition: aactab.c:92