FFmpeg
pcm.c
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1 /*
2  * PCM codecs
3  * Copyright (c) 2001 Fabrice Bellard
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 /**
23  * @file
24  * PCM codecs
25  */
26 
27 #include "config.h"
28 #include "libavutil/attributes.h"
29 #include "libavutil/float_dsp.h"
30 #include "libavutil/thread.h"
31 #include "avcodec.h"
32 #include "bytestream.h"
33 #include "internal.h"
34 #include "mathops.h"
35 #include "pcm_tablegen.h"
36 
38 {
39  avctx->frame_size = 0;
40 #if !CONFIG_HARDCODED_TABLES
41  switch (avctx->codec->id) {
42 #define INIT_ONCE(id, name) \
43  case AV_CODEC_ID_PCM_ ## id: \
44  if (CONFIG_PCM_ ## id ## _ENCODER) { \
45  static AVOnce init_static_once = AV_ONCE_INIT; \
46  ff_thread_once(&init_static_once, pcm_ ## name ## _tableinit); \
47  } \
48  break
49  INIT_ONCE(ALAW, alaw);
50  INIT_ONCE(MULAW, ulaw);
51  INIT_ONCE(VIDC, vidc);
52  default:
53  break;
54  }
55 #endif
56 
58  avctx->block_align = avctx->channels * avctx->bits_per_coded_sample / 8;
59  avctx->bit_rate = avctx->block_align * 8LL * avctx->sample_rate;
60 
61  return 0;
62 }
63 
64 /**
65  * Write PCM samples macro
66  * @param type Datatype of native machine format
67  * @param endian bytestream_put_xxx() suffix
68  * @param src Source pointer (variable name)
69  * @param dst Destination pointer (variable name)
70  * @param n Total number of samples (variable name)
71  * @param shift Bitshift (bits)
72  * @param offset Sample value offset
73  */
74 #define ENCODE(type, endian, src, dst, n, shift, offset) \
75  samples_ ## type = (const type *) src; \
76  for (; n > 0; n--) { \
77  register type v = (*samples_ ## type++ >> shift) + offset; \
78  bytestream_put_ ## endian(&dst, v); \
79  }
80 
81 #define ENCODE_PLANAR(type, endian, dst, n, shift, offset) \
82  n /= avctx->channels; \
83  for (c = 0; c < avctx->channels; c++) { \
84  int i; \
85  samples_ ## type = (const type *) frame->extended_data[c]; \
86  for (i = n; i > 0; i--) { \
87  register type v = (*samples_ ## type++ >> shift) + offset; \
88  bytestream_put_ ## endian(&dst, v); \
89  } \
90  }
91 
92 static int pcm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
93  const AVFrame *frame, int *got_packet_ptr)
94 {
95  int n, c, sample_size, v, ret;
96  const short *samples;
97  unsigned char *dst;
98  const uint8_t *samples_uint8_t;
99  const int16_t *samples_int16_t;
100  const int32_t *samples_int32_t;
101  const int64_t *samples_int64_t;
102  const uint16_t *samples_uint16_t;
103  const uint32_t *samples_uint32_t;
104 
105  sample_size = av_get_bits_per_sample(avctx->codec->id) / 8;
106  n = frame->nb_samples * avctx->channels;
107  samples = (const short *)frame->data[0];
108 
109  if ((ret = ff_alloc_packet2(avctx, avpkt, n * sample_size, n * sample_size)) < 0)
110  return ret;
111  dst = avpkt->data;
112 
113  switch (avctx->codec->id) {
115  ENCODE(uint32_t, le32, samples, dst, n, 0, 0x80000000)
116  break;
118  ENCODE(uint32_t, be32, samples, dst, n, 0, 0x80000000)
119  break;
121  ENCODE(int32_t, le24, samples, dst, n, 8, 0)
122  break;
124  ENCODE_PLANAR(int32_t, le24, dst, n, 8, 0)
125  break;
127  ENCODE(int32_t, be24, samples, dst, n, 8, 0)
128  break;
130  ENCODE(uint32_t, le24, samples, dst, n, 8, 0x800000)
131  break;
133  ENCODE(uint32_t, be24, samples, dst, n, 8, 0x800000)
134  break;
136  for (; n > 0; n--) {
137  uint32_t tmp = ff_reverse[(*samples >> 8) & 0xff] +
138  (ff_reverse[*samples & 0xff] << 8);
139  tmp <<= 4; // sync flags would go here
140  bytestream_put_be24(&dst, tmp);
141  samples++;
142  }
143  break;
145  ENCODE(uint16_t, le16, samples, dst, n, 0, 0x8000)
146  break;
148  ENCODE(uint16_t, be16, samples, dst, n, 0, 0x8000)
149  break;
150  case AV_CODEC_ID_PCM_S8:
151  ENCODE(uint8_t, byte, samples, dst, n, 0, -128)
152  break;
154  ENCODE_PLANAR(uint8_t, byte, dst, n, 0, -128)
155  break;
156 #if HAVE_BIGENDIAN
159  ENCODE(int64_t, le64, samples, dst, n, 0, 0)
160  break;
163  ENCODE(int32_t, le32, samples, dst, n, 0, 0)
164  break;
166  ENCODE_PLANAR(int32_t, le32, dst, n, 0, 0)
167  break;
169  ENCODE(int16_t, le16, samples, dst, n, 0, 0)
170  break;
172  ENCODE_PLANAR(int16_t, le16, dst, n, 0, 0)
173  break;
179 #else
182  ENCODE(int64_t, be64, samples, dst, n, 0, 0)
183  break;
186  ENCODE(int32_t, be32, samples, dst, n, 0, 0)
187  break;
189  ENCODE(int16_t, be16, samples, dst, n, 0, 0)
190  break;
192  ENCODE_PLANAR(int16_t, be16, dst, n, 0, 0)
193  break;
199 #endif /* HAVE_BIGENDIAN */
200  case AV_CODEC_ID_PCM_U8:
201  memcpy(dst, samples, n * sample_size);
202  break;
203 #if HAVE_BIGENDIAN
205 #else
208 #endif /* HAVE_BIGENDIAN */
209  n /= avctx->channels;
210  for (c = 0; c < avctx->channels; c++) {
211  const uint8_t *src = frame->extended_data[c];
212  bytestream_put_buffer(&dst, src, n * sample_size);
213  }
214  break;
216  for (; n > 0; n--) {
217  v = *samples++;
218  *dst++ = linear_to_alaw[(v + 32768) >> 2];
219  }
220  break;
222  for (; n > 0; n--) {
223  v = *samples++;
224  *dst++ = linear_to_ulaw[(v + 32768) >> 2];
225  }
226  break;
228  for (; n > 0; n--) {
229  v = *samples++;
230  *dst++ = linear_to_vidc[(v + 32768) >> 2];
231  }
232  break;
233  default:
234  return -1;
235  }
236 
237  *got_packet_ptr = 1;
238  return 0;
239 }
240 
241 typedef struct PCMDecode {
242  short table[256];
243  void (*vector_fmul_scalar)(float *dst, const float *src, float mul,
244  int len);
245  float scale;
246 } PCMDecode;
247 
249 {
250  PCMDecode *s = avctx->priv_data;
251  AVFloatDSPContext *fdsp;
252  int i;
253 
254  if (avctx->channels <= 0) {
255  av_log(avctx, AV_LOG_ERROR, "PCM channels out of bounds\n");
256  return AVERROR(EINVAL);
257  }
258 
259  switch (avctx->codec_id) {
261  for (i = 0; i < 256; i++)
262  s->table[i] = alaw2linear(i);
263  break;
265  for (i = 0; i < 256; i++)
266  s->table[i] = ulaw2linear(i);
267  break;
269  for (i = 0; i < 256; i++)
270  s->table[i] = vidc2linear(i);
271  break;
274  if (avctx->bits_per_coded_sample < 1 || avctx->bits_per_coded_sample > 24)
275  return AVERROR_INVALIDDATA;
276 
277  s->scale = 1. / (1 << (avctx->bits_per_coded_sample - 1));
278  fdsp = avpriv_float_dsp_alloc(0);
279  if (!fdsp)
280  return AVERROR(ENOMEM);
282  av_free(fdsp);
283  break;
284  default:
285  break;
286  }
287 
288  avctx->sample_fmt = avctx->codec->sample_fmts[0];
289 
290  if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)
292 
293  return 0;
294 }
295 
296 /**
297  * Read PCM samples macro
298  * @param size Data size of native machine format
299  * @param endian bytestream_get_xxx() endian suffix
300  * @param src Source pointer (variable name)
301  * @param dst Destination pointer (variable name)
302  * @param n Total number of samples (variable name)
303  * @param shift Bitshift (bits)
304  * @param offset Sample value offset
305  */
306 #define DECODE(size, endian, src, dst, n, shift, offset) \
307  for (; n > 0; n--) { \
308  uint ## size ## _t v = bytestream_get_ ## endian(&src); \
309  AV_WN ## size ## A(dst, (uint ## size ## _t)(v - offset) << shift); \
310  dst += size / 8; \
311  }
312 
313 #define DECODE_PLANAR(size, endian, src, dst, n, shift, offset) \
314  n /= avctx->channels; \
315  for (c = 0; c < avctx->channels; c++) { \
316  int i; \
317  dst = frame->extended_data[c]; \
318  for (i = n; i > 0; i--) { \
319  uint ## size ## _t v = bytestream_get_ ## endian(&src); \
320  AV_WN ## size ## A(dst, (uint ## size ##_t)(v - offset) << shift); \
321  dst += size / 8; \
322  } \
323  }
324 
325 static int pcm_decode_frame(AVCodecContext *avctx, void *data,
326  int *got_frame_ptr, AVPacket *avpkt)
327 {
328  const uint8_t *src = avpkt->data;
329  int buf_size = avpkt->size;
330  PCMDecode *s = avctx->priv_data;
331  AVFrame *frame = data;
332  int sample_size, c, n, ret, samples_per_block;
333  uint8_t *samples;
334  int32_t *dst_int32_t;
335 
336  sample_size = av_get_bits_per_sample(avctx->codec_id) / 8;
337 
338  /* av_get_bits_per_sample returns 0 for AV_CODEC_ID_PCM_DVD */
339  samples_per_block = 1;
340  if (avctx->codec_id == AV_CODEC_ID_PCM_LXF) {
341  /* we process 40-bit blocks per channel for LXF */
342  samples_per_block = 2;
343  sample_size = 5;
344  }
345 
346  if (sample_size == 0) {
347  av_log(avctx, AV_LOG_ERROR, "Invalid sample_size\n");
348  return AVERROR(EINVAL);
349  }
350 
351  if (avctx->channels == 0) {
352  av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
353  return AVERROR(EINVAL);
354  }
355 
356  if (avctx->codec_id != avctx->codec->id) {
357  av_log(avctx, AV_LOG_ERROR, "codec ids mismatch\n");
358  return AVERROR(EINVAL);
359  }
360 
361  n = avctx->channels * sample_size;
362 
363  if (n && buf_size % n) {
364  if (buf_size < n) {
365  av_log(avctx, AV_LOG_ERROR,
366  "Invalid PCM packet, data has size %d but at least a size of %d was expected\n",
367  buf_size, n);
368  return AVERROR_INVALIDDATA;
369  } else
370  buf_size -= buf_size % n;
371  }
372 
373  n = buf_size / sample_size;
374 
375  /* get output buffer */
376  frame->nb_samples = n * samples_per_block / avctx->channels;
377  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
378  return ret;
379  samples = frame->data[0];
380 
381  switch (avctx->codec_id) {
383  DECODE(32, le32, src, samples, n, 0, 0x80000000)
384  break;
386  DECODE(32, be32, src, samples, n, 0, 0x80000000)
387  break;
389  DECODE(32, le24, src, samples, n, 8, 0)
390  break;
392  DECODE_PLANAR(32, le24, src, samples, n, 8, 0);
393  break;
395  DECODE(32, be24, src, samples, n, 8, 0)
396  break;
398  DECODE(32, le24, src, samples, n, 8, 0x800000)
399  break;
401  DECODE(32, be24, src, samples, n, 8, 0x800000)
402  break;
404  for (; n > 0; n--) {
405  uint32_t v = bytestream_get_be24(&src);
406  v >>= 4; // sync flags are here
407  AV_WN16A(samples, ff_reverse[(v >> 8) & 0xff] +
408  (ff_reverse[v & 0xff] << 8));
409  samples += 2;
410  }
411  break;
413  DECODE(16, le16, src, samples, n, 0, 0x8000)
414  break;
416  DECODE(16, be16, src, samples, n, 0, 0x8000)
417  break;
418  case AV_CODEC_ID_PCM_S8:
419  for (; n > 0; n--)
420  *samples++ = *src++ + 128;
421  break;
422  case AV_CODEC_ID_PCM_SGA:
423  for (; n > 0; n--) {
424  int sign = *src >> 7;
425  int magn = *src & 0x7f;
426  *samples++ = sign ? 128 - magn : 128 + magn;
427  src++;
428  }
429  break;
431  n /= avctx->channels;
432  for (c = 0; c < avctx->channels; c++) {
433  int i;
434  samples = frame->extended_data[c];
435  for (i = n; i > 0; i--)
436  *samples++ = *src++ + 128;
437  }
438  break;
439 #if HAVE_BIGENDIAN
442  DECODE(64, le64, src, samples, n, 0, 0)
443  break;
448  DECODE(32, le32, src, samples, n, 0, 0)
449  break;
451  DECODE_PLANAR(32, le32, src, samples, n, 0, 0);
452  break;
454  DECODE(16, le16, src, samples, n, 0, 0)
455  break;
457  DECODE_PLANAR(16, le16, src, samples, n, 0, 0);
458  break;
464 #else
467  DECODE(64, be64, src, samples, n, 0, 0)
468  break;
471  DECODE(32, be32, src, samples, n, 0, 0)
472  break;
474  DECODE(16, be16, src, samples, n, 0, 0)
475  break;
477  DECODE_PLANAR(16, be16, src, samples, n, 0, 0);
478  break;
486 #endif /* HAVE_BIGENDIAN */
487  case AV_CODEC_ID_PCM_U8:
488  memcpy(samples, src, n * sample_size);
489  break;
490 #if HAVE_BIGENDIAN
492 #else
495 #endif /* HAVE_BIGENDIAN */
496  n /= avctx->channels;
497  for (c = 0; c < avctx->channels; c++) {
498  samples = frame->extended_data[c];
499  bytestream_get_buffer(&src, samples, n * sample_size);
500  }
501  break;
505  for (; n > 0; n--) {
506  AV_WN16A(samples, s->table[*src++]);
507  samples += 2;
508  }
509  break;
510  case AV_CODEC_ID_PCM_LXF:
511  {
512  int i;
513  n /= avctx->channels;
514  for (c = 0; c < avctx->channels; c++) {
515  dst_int32_t = (int32_t *)frame->extended_data[c];
516  for (i = 0; i < n; i++) {
517  // extract low 20 bits and expand to 32 bits
518  *dst_int32_t++ = ((uint32_t)src[2]<<28) |
519  (src[1] << 20) |
520  (src[0] << 12) |
521  ((src[2] & 0x0F) << 8) |
522  src[1];
523  // extract high 20 bits and expand to 32 bits
524  *dst_int32_t++ = ((uint32_t)src[4]<<24) |
525  (src[3] << 16) |
526  ((src[2] & 0xF0) << 8) |
527  (src[4] << 4) |
528  (src[3] >> 4);
529  src += 5;
530  }
531  }
532  break;
533  }
534  default:
535  return -1;
536  }
537 
538  if (avctx->codec_id == AV_CODEC_ID_PCM_F16LE ||
539  avctx->codec_id == AV_CODEC_ID_PCM_F24LE) {
540  s->vector_fmul_scalar((float *)frame->extended_data[0],
541  (const float *)frame->extended_data[0],
542  s->scale, FFALIGN(frame->nb_samples * avctx->channels, 4));
543  emms_c();
544  }
545 
546  *got_frame_ptr = 1;
547 
548  return buf_size;
549 }
550 
551 #define PCM_ENCODER_0(id_, sample_fmt_, name_, long_name_)
552 #define PCM_ENCODER_1(id_, sample_fmt_, name_, long_name_) \
553 AVCodec ff_ ## name_ ## _encoder = { \
554  .name = #name_, \
555  .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
556  .type = AVMEDIA_TYPE_AUDIO, \
557  .id = AV_CODEC_ID_ ## id_, \
558  .init = pcm_encode_init, \
559  .encode2 = pcm_encode_frame, \
560  .capabilities = AV_CODEC_CAP_VARIABLE_FRAME_SIZE, \
561  .sample_fmts = (const enum AVSampleFormat[]){ sample_fmt_, \
562  AV_SAMPLE_FMT_NONE }, \
563  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, \
564 }
565 
566 #define PCM_ENCODER_2(cf, id, sample_fmt, name, long_name) \
567  PCM_ENCODER_ ## cf(id, sample_fmt, name, long_name)
568 #define PCM_ENCODER_3(cf, id, sample_fmt, name, long_name) \
569  PCM_ENCODER_2(cf, id, sample_fmt, name, long_name)
570 #define PCM_ENCODER(id, sample_fmt, name, long_name) \
571  PCM_ENCODER_3(CONFIG_ ## id ## _ENCODER, id, sample_fmt, name, long_name)
572 
573 #define PCM_DECODER_0(id, sample_fmt, name, long_name)
574 #define PCM_DECODER_1(id_, sample_fmt_, name_, long_name_) \
575 AVCodec ff_ ## name_ ## _decoder = { \
576  .name = #name_, \
577  .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
578  .type = AVMEDIA_TYPE_AUDIO, \
579  .id = AV_CODEC_ID_ ## id_, \
580  .priv_data_size = sizeof(PCMDecode), \
581  .init = pcm_decode_init, \
582  .decode = pcm_decode_frame, \
583  .capabilities = AV_CODEC_CAP_DR1, \
584  .sample_fmts = (const enum AVSampleFormat[]){ sample_fmt_, \
585  AV_SAMPLE_FMT_NONE }, \
586  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, \
587 }
588 
589 #define PCM_DECODER_2(cf, id, sample_fmt, name, long_name) \
590  PCM_DECODER_ ## cf(id, sample_fmt, name, long_name)
591 #define PCM_DECODER_3(cf, id, sample_fmt, name, long_name) \
592  PCM_DECODER_2(cf, id, sample_fmt, name, long_name)
593 #define PCM_DECODER(id, sample_fmt, name, long_name) \
594  PCM_DECODER_3(CONFIG_ ## id ## _DECODER, id, sample_fmt, name, long_name)
595 
596 #define PCM_CODEC(id, sample_fmt_, name, long_name_) \
597  PCM_ENCODER(id, sample_fmt_, name, long_name_); \
598  PCM_DECODER(id, sample_fmt_, name, long_name_)
599 
600 /* Note: Do not forget to add new entries to the Makefile as well. */
601 PCM_CODEC (PCM_ALAW, AV_SAMPLE_FMT_S16, pcm_alaw, "PCM A-law / G.711 A-law");
602 PCM_DECODER(PCM_F16LE, AV_SAMPLE_FMT_FLT, pcm_f16le, "PCM 16.8 floating point little-endian");
603 PCM_DECODER(PCM_F24LE, AV_SAMPLE_FMT_FLT, pcm_f24le, "PCM 24.0 floating point little-endian");
604 PCM_CODEC (PCM_F32BE, AV_SAMPLE_FMT_FLT, pcm_f32be, "PCM 32-bit floating point big-endian");
605 PCM_CODEC (PCM_F32LE, AV_SAMPLE_FMT_FLT, pcm_f32le, "PCM 32-bit floating point little-endian");
606 PCM_CODEC (PCM_F64BE, AV_SAMPLE_FMT_DBL, pcm_f64be, "PCM 64-bit floating point big-endian");
607 PCM_CODEC (PCM_F64LE, AV_SAMPLE_FMT_DBL, pcm_f64le, "PCM 64-bit floating point little-endian");
608 PCM_DECODER(PCM_LXF, AV_SAMPLE_FMT_S32P,pcm_lxf, "PCM signed 20-bit little-endian planar");
609 PCM_CODEC (PCM_MULAW, AV_SAMPLE_FMT_S16, pcm_mulaw, "PCM mu-law / G.711 mu-law");
610 PCM_CODEC (PCM_S8, AV_SAMPLE_FMT_U8, pcm_s8, "PCM signed 8-bit");
611 PCM_CODEC (PCM_S8_PLANAR, AV_SAMPLE_FMT_U8P, pcm_s8_planar, "PCM signed 8-bit planar");
612 PCM_CODEC (PCM_S16BE, AV_SAMPLE_FMT_S16, pcm_s16be, "PCM signed 16-bit big-endian");
613 PCM_CODEC (PCM_S16BE_PLANAR, AV_SAMPLE_FMT_S16P,pcm_s16be_planar, "PCM signed 16-bit big-endian planar");
614 PCM_CODEC (PCM_S16LE, AV_SAMPLE_FMT_S16, pcm_s16le, "PCM signed 16-bit little-endian");
615 PCM_CODEC (PCM_S16LE_PLANAR, AV_SAMPLE_FMT_S16P,pcm_s16le_planar, "PCM signed 16-bit little-endian planar");
616 PCM_CODEC (PCM_S24BE, AV_SAMPLE_FMT_S32, pcm_s24be, "PCM signed 24-bit big-endian");
617 PCM_CODEC (PCM_S24DAUD, AV_SAMPLE_FMT_S16, pcm_s24daud, "PCM D-Cinema audio signed 24-bit");
618 PCM_CODEC (PCM_S24LE, AV_SAMPLE_FMT_S32, pcm_s24le, "PCM signed 24-bit little-endian");
619 PCM_CODEC (PCM_S24LE_PLANAR, AV_SAMPLE_FMT_S32P,pcm_s24le_planar, "PCM signed 24-bit little-endian planar");
620 PCM_CODEC (PCM_S32BE, AV_SAMPLE_FMT_S32, pcm_s32be, "PCM signed 32-bit big-endian");
621 PCM_CODEC (PCM_S32LE, AV_SAMPLE_FMT_S32, pcm_s32le, "PCM signed 32-bit little-endian");
622 PCM_CODEC (PCM_S32LE_PLANAR, AV_SAMPLE_FMT_S32P,pcm_s32le_planar, "PCM signed 32-bit little-endian planar");
623 PCM_CODEC (PCM_U8, AV_SAMPLE_FMT_U8, pcm_u8, "PCM unsigned 8-bit");
624 PCM_CODEC (PCM_U16BE, AV_SAMPLE_FMT_S16, pcm_u16be, "PCM unsigned 16-bit big-endian");
625 PCM_CODEC (PCM_U16LE, AV_SAMPLE_FMT_S16, pcm_u16le, "PCM unsigned 16-bit little-endian");
626 PCM_CODEC (PCM_U24BE, AV_SAMPLE_FMT_S32, pcm_u24be, "PCM unsigned 24-bit big-endian");
627 PCM_CODEC (PCM_U24LE, AV_SAMPLE_FMT_S32, pcm_u24le, "PCM unsigned 24-bit little-endian");
628 PCM_CODEC (PCM_U32BE, AV_SAMPLE_FMT_S32, pcm_u32be, "PCM unsigned 32-bit big-endian");
629 PCM_CODEC (PCM_U32LE, AV_SAMPLE_FMT_S32, pcm_u32le, "PCM unsigned 32-bit little-endian");
630 PCM_CODEC (PCM_S64BE, AV_SAMPLE_FMT_S64, pcm_s64be, "PCM signed 64-bit big-endian");
631 PCM_CODEC (PCM_S64LE, AV_SAMPLE_FMT_S64, pcm_s64le, "PCM signed 64-bit little-endian");
632 PCM_CODEC (PCM_VIDC, AV_SAMPLE_FMT_S16, pcm_vidc, "PCM Archimedes VIDC");
633 PCM_DECODER(PCM_SGA, AV_SAMPLE_FMT_U8, pcm_sga, "PCM SGA");
const struct AVCodec * codec
Definition: avcodec.h:545
static av_cold int vidc2linear(unsigned char u_val)
Definition: pcm_tablegen.h:78
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
int64_t bit_rate
the average bitrate
Definition: avcodec.h:586
const uint8_t ff_reverse[256]
Definition: reverse.c:23
#define DECODE_PLANAR(size, endian, src, dst, n, shift, offset)
Definition: pcm.c:313
static av_cold int ulaw2linear(unsigned char u_val)
Definition: pcm_tablegen.h:61
static int pcm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: pcm.c:92
int size
Definition: packet.h:370
void(* vector_fmul_scalar)(float *dst, const float *src, float mul, int len)
Definition: pcm.c:243
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1747
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1233
Macro definitions for various function/variable attributes.
uint64_t_TMPL AV_WL64 unsigned int_TMPL le32
Definition: bytestream.h:91
Definition: pcm.c:241
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:33
short table[256]
Definition: pcm.c:242
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1204
uint8_t
#define av_cold
Definition: attributes.h:88
AV_SAMPLE_FMT_U8
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
uint8_t * data
Definition: packet.h:369
static uint8_t linear_to_ulaw[16384]
Definition: pcm_tablegen.h:100
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1740
signed 32 bits
Definition: samplefmt.h:62
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL be24
Definition: bytestream.h:91
#define FFALIGN(x, a)
Definition: macros.h:48
#define av_log(a,...)
#define src
Definition: vp8dsp.c:255
static int pcm_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: pcm.c:325
enum AVCodecID id
Definition: codec.h:211
#define PCM_CODEC(id, sample_fmt_, name, long_name_)
Definition: pcm.c:596
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:613
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
Definition: float_dsp.c:135
#define DECODE(size, endian, src, dst, n, shift, offset)
Read PCM samples macro.
Definition: pcm.c:306
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL be64
Definition: bytestream.h:91
#define ENCODE_PLANAR(type, endian, dst, n, shift, offset)
Definition: pcm.c:81
static float mul(float src0, float src1)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL be16
Definition: bytestream.h:91
#define ENCODE(type, endian, src, dst, n, shift, offset)
Write PCM samples macro.
Definition: pcm.c:74
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL le24
Definition: bytestream.h:91
static av_cold int pcm_encode_init(AVCodecContext *avctx)
Definition: pcm.c:37
static av_cold int alaw2linear(unsigned char a_val)
Definition: pcm_tablegen.h:46
signed 32 bits, planar
Definition: samplefmt.h:68
uint64_t_TMPL le64
Definition: bytestream.h:91
signed 64 bits
Definition: samplefmt.h:71
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
int32_t
float scale
Definition: pcm.c:245
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
#define s(width, name)
Definition: cbs_vp9.c:257
unsigned 8 bits, planar
Definition: samplefmt.h:66
#define AV_WN16A(p, v)
Definition: intreadwrite.h:534
static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size)
Definition: bytestream.h:363
if(ret)
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1216
Libavcodec external API header.
enum AVCodecID codec_id
Definition: avcodec.h:546
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_WB16 unsigned int_TMPL byte
Definition: bytestream.h:91
int sample_rate
samples per second
Definition: avcodec.h:1196
main external API structure.
Definition: avcodec.h:536
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1893
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL be32
Definition: bytestream.h:91
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL le16
Definition: bytestream.h:91
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:85
static av_cold int pcm_decode_init(AVCodecContext *avctx)
Definition: pcm.c:248
#define PCM_DECODER(id, sample_fmt, name, long_name)
Definition: pcm.c:593
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
common internal api header.
signed 16 bits
Definition: samplefmt.h:61
#define INIT_ONCE(id, name)
static uint8_t linear_to_vidc[16384]
Definition: pcm_tablegen.h:101
static uint8_t linear_to_alaw[16384]
Definition: pcm_tablegen.h:99
static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
Definition: bytestream.h:372
void * priv_data
Definition: avcodec.h:563
#define av_free(p)
int len
int channels
number of audio channels
Definition: avcodec.h:1197
Filter the word “frame” indicates either a video frame or a group of audio samples
signed 16 bits, planar
Definition: samplefmt.h:67
enum AVSampleFormat * sample_fmts
array of supported sample formats, or NULL if unknown, array is terminated by -1
Definition: codec.h:220
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
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:365
This structure stores compressed data.
Definition: packet.h:346
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:384
for(j=16;j >0;--j)
int i
Definition: input.c:407
static uint8_t tmp[11]
Definition: aes_ctr.c:27