FFmpeg  4.3.6
spdifenc.c
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1 /*
2  * IEC 61937 muxer
3  * Copyright (c) 2009 Bartlomiej Wolowiec
4  * Copyright (c) 2010, 2020 Anssi Hannula
5  * Copyright (c) 2010 Carl Eugen Hoyos
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 /**
25  * @file
26  * IEC-61937 encapsulation of various formats, used by S/PDIF
27  * @author Bartlomiej Wolowiec
28  * @author Anssi Hannula
29  * @author Carl Eugen Hoyos
30  */
31 
32 /*
33  * Terminology used in specification:
34  * data-burst - IEC61937 frame, contains header and encapsuled frame
35  * burst-preamble - IEC61937 frame header, contains 16-bit words named Pa, Pb, Pc and Pd
36  * burst-payload - encapsuled frame
37  * Pa, Pb - syncword - 0xF872, 0x4E1F
38  * Pc - burst-info, contains data-type (bits 0-6), error flag (bit 7), data-type-dependent info (bits 8-12)
39  * and bitstream number (bits 13-15)
40  * data-type - determines type of encapsuled frames
41  * Pd - length code (number of bits or bytes of encapsuled frame - according to data_type)
42  *
43  * IEC 61937 frames at normal usage start every specific count of bytes,
44  * dependent from data-type (spaces between packets are filled by zeros)
45  */
46 
47 #include <inttypes.h>
48 
49 #include "avformat.h"
50 #include "avio_internal.h"
51 #include "spdif.h"
52 #include "libavcodec/ac3.h"
53 #include "libavcodec/adts_parser.h"
54 #include "libavcodec/dca.h"
56 #include "libavutil/opt.h"
57 
58 typedef struct IEC61937Context {
59  const AVClass *av_class;
60  enum IEC61937DataType data_type;///< burst info - reference to type of payload of the data-burst
61  int length_code; ///< length code in bits or bytes, depending on data type
62  int pkt_offset; ///< data burst repetition period in bytes
63  uint8_t *buffer; ///< allocated buffer, used for swap bytes
64  int buffer_size; ///< size of allocated buffer
65 
66  uint8_t *out_buf; ///< pointer to the outgoing data before byte-swapping
67  int out_bytes; ///< amount of outgoing bytes
68 
69  int use_preamble; ///< preamble enabled (disabled for exactly pre-padded DTS)
70  int extra_bswap; ///< extra bswap for payload (for LE DTS => standard BE DTS)
71 
72  uint8_t *hd_buf[2]; ///< allocated buffers to concatenate hd audio frames
73  int hd_buf_size; ///< size of the hd audio buffer (eac3, dts4)
74  int hd_buf_count; ///< number of frames in the hd audio buffer (eac3)
75  int hd_buf_filled; ///< amount of bytes in the hd audio buffer (eac3, truehd)
76  int hd_buf_idx; ///< active hd buffer index (truehd)
77 
78  int dtshd_skip; ///< counter used for skipping DTS-HD frames
79 
80  uint16_t truehd_prev_time; ///< input_timing from the last frame
81  int truehd_prev_size; ///< previous frame size in bytes, including any MAT codes
82  int truehd_samples_per_frame; ///< samples per frame for padding calculation
83 
84  /* AVOptions: */
87 #define SPDIF_FLAG_BIGENDIAN 0x01
89 
90  /// function, which generates codec dependent header information.
91  /// Sets data_type and pkt_offset, and length_code, out_bytes, out_buf if necessary
94 
95 static const AVOption options[] = {
96 { "spdif_flags", "IEC 61937 encapsulation flags", offsetof(IEC61937Context, spdif_flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" },
97 { "be", "output in big-endian format (for use as s16be)", 0, AV_OPT_TYPE_CONST, {.i64 = SPDIF_FLAG_BIGENDIAN}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" },
98 { "dtshd_rate", "mux complete DTS frames in HD mode at the specified IEC958 rate (in Hz, default 0=disabled)", offsetof(IEC61937Context, dtshd_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 768000, AV_OPT_FLAG_ENCODING_PARAM },
99 { "dtshd_fallback_time", "min secs to strip HD for after an overflow (-1: till the end, default 60)", offsetof(IEC61937Context, dtshd_fallback), AV_OPT_TYPE_INT, {.i64 = 60}, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
100 { NULL },
101 };
102 
103 static const AVClass spdif_class = {
104  .class_name = "spdif",
105  .item_name = av_default_item_name,
106  .option = options,
107  .version = LIBAVUTIL_VERSION_INT,
108 };
109 
111 {
113  int bitstream_mode = pkt->data[5] & 0x7;
114 
115  ctx->data_type = IEC61937_AC3 | (bitstream_mode << 8);
116  ctx->pkt_offset = AC3_FRAME_SIZE << 2;
117  return 0;
118 }
119 
121 {
123  static const uint8_t eac3_repeat[4] = {6, 3, 2, 1};
124  int repeat = 1;
125  uint8_t *tmp;
126 
127  int bsid = pkt->data[5] >> 3;
128  if (bsid > 10 && (pkt->data[4] & 0xc0) != 0xc0) /* fscod */
129  repeat = eac3_repeat[(pkt->data[4] & 0x30) >> 4]; /* numblkscod */
130 
131  tmp = av_fast_realloc(ctx->hd_buf[0], &ctx->hd_buf_size, ctx->hd_buf_filled + pkt->size);
132  if (!tmp)
133  return AVERROR(ENOMEM);
134  ctx->hd_buf[0] = tmp;
135 
136  memcpy(&ctx->hd_buf[0][ctx->hd_buf_filled], pkt->data, pkt->size);
137 
138  ctx->hd_buf_filled += pkt->size;
139  if (++ctx->hd_buf_count < repeat){
140  ctx->pkt_offset = 0;
141  return 0;
142  }
143  ctx->data_type = IEC61937_EAC3;
144  ctx->pkt_offset = 24576;
145  ctx->out_buf = ctx->hd_buf[0];
146  ctx->out_bytes = ctx->hd_buf_filled;
147  ctx->length_code = ctx->hd_buf_filled;
148 
149  ctx->hd_buf_count = 0;
150  ctx->hd_buf_filled = 0;
151  return 0;
152 }
153 
154 /*
155  * DTS type IV (DTS-HD) can be transmitted with various frame repetition
156  * periods; longer repetition periods allow for longer packets and therefore
157  * higher bitrate. Longer repetition periods mean that the constant bitrate of
158  * the output IEC 61937 stream is higher.
159  * The repetition period is measured in IEC 60958 frames (4 bytes).
160  */
161 static int spdif_dts4_subtype(int period)
162 {
163  switch (period) {
164  case 512: return 0x0;
165  case 1024: return 0x1;
166  case 2048: return 0x2;
167  case 4096: return 0x3;
168  case 8192: return 0x4;
169  case 16384: return 0x5;
170  }
171  return -1;
172 }
173 
174 static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size,
175  int sample_rate, int blocks)
176 {
178  static const char dtshd_start_code[10] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe };
179  int pkt_size = pkt->size;
180  int period;
181  int subtype;
182 
183  if (!core_size) {
184  av_log(s, AV_LOG_ERROR, "HD mode not supported for this format\n");
185  return AVERROR(EINVAL);
186  }
187 
188  if (!sample_rate) {
189  av_log(s, AV_LOG_ERROR, "Unknown DTS sample rate for HD\n");
190  return AVERROR_INVALIDDATA;
191  }
192 
193  period = ctx->dtshd_rate * (blocks << 5) / sample_rate;
194  subtype = spdif_dts4_subtype(period);
195 
196  if (subtype < 0) {
197  av_log(s, AV_LOG_ERROR, "Specified HD rate of %d Hz would require an "
198  "impossible repetition period of %d for the current DTS stream"
199  " (blocks = %d, sample rate = %d)\n", ctx->dtshd_rate, period,
200  blocks << 5, sample_rate);
201  return AVERROR(EINVAL);
202  }
203 
204  /* set pkt_offset and DTS IV subtype according to the requested output
205  * rate */
206  ctx->pkt_offset = period * 4;
207  ctx->data_type = IEC61937_DTSHD | subtype << 8;
208 
209  /* If the bitrate is too high for transmitting at the selected
210  * repetition period setting, strip DTS-HD until a good amount
211  * of consecutive non-overflowing HD frames have been observed.
212  * This generally only happens if the caller is cramming a Master
213  * Audio stream into 192kHz IEC 60958 (which may or may not fit). */
214  if (sizeof(dtshd_start_code) + 2 + pkt_size
215  > ctx->pkt_offset - BURST_HEADER_SIZE && core_size) {
216  if (!ctx->dtshd_skip)
217  av_log(s, AV_LOG_WARNING, "DTS-HD bitrate too high, "
218  "temporarily sending core only\n");
219  if (ctx->dtshd_fallback > 0)
220  ctx->dtshd_skip = sample_rate * ctx->dtshd_fallback / (blocks << 5);
221  else
222  /* skip permanently (dtshd_fallback == -1) or just once
223  * (dtshd_fallback == 0) */
224  ctx->dtshd_skip = 1;
225  }
226  if (ctx->dtshd_skip && core_size) {
227  pkt_size = core_size;
228  if (ctx->dtshd_fallback >= 0)
229  --ctx->dtshd_skip;
230  }
231 
232  ctx->out_bytes = sizeof(dtshd_start_code) + 2 + pkt_size;
233 
234  /* Align so that (length_code & 0xf) == 0x8. This is reportedly needed
235  * with some receivers, but the exact requirement is unconfirmed. */
236  ctx->length_code = FFALIGN(ctx->out_bytes + 0x8, 0x10) - 0x8;
237 
238  av_fast_malloc(&ctx->hd_buf[0], &ctx->hd_buf_size, ctx->out_bytes);
239  if (!ctx->hd_buf[0])
240  return AVERROR(ENOMEM);
241 
242  ctx->out_buf = ctx->hd_buf[0];
243 
244  memcpy(ctx->hd_buf[0], dtshd_start_code, sizeof(dtshd_start_code));
245  AV_WB16(ctx->hd_buf[0] + sizeof(dtshd_start_code), pkt_size);
246  memcpy(ctx->hd_buf[0] + sizeof(dtshd_start_code) + 2, pkt->data, pkt_size);
247 
248  return 0;
249 }
250 
252 {
254  uint32_t syncword_dts = AV_RB32(pkt->data);
255  int blocks;
256  int sample_rate = 0;
257  int core_size = 0;
258 
259  if (pkt->size < 9)
260  return AVERROR_INVALIDDATA;
261 
262  switch (syncword_dts) {
264  blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f;
265  core_size = ((AV_RB24(pkt->data + 5) >> 4) & 0x3fff) + 1;
266  sample_rate = avpriv_dca_sample_rates[(pkt->data[8] >> 2) & 0x0f];
267  break;
269  blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f;
270  ctx->extra_bswap = 1;
271  break;
273  blocks =
274  (((pkt->data[5] & 0x07) << 4) | ((pkt->data[6] & 0x3f) >> 2));
275  break;
277  blocks =
278  (((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2));
279  ctx->extra_bswap = 1;
280  break;
282  /* We only handle HD frames that are paired with core. However,
283  sometimes DTS-HD streams with core have a stray HD frame without
284  core in the beginning of the stream. */
285  av_log(s, AV_LOG_ERROR, "stray DTS-HD frame\n");
286  return AVERROR_INVALIDDATA;
287  default:
288  av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%"PRIx32"\n", syncword_dts);
289  return AVERROR_INVALIDDATA;
290  }
291  blocks++;
292 
293  if (ctx->dtshd_rate)
294  /* DTS type IV output requested */
295  return spdif_header_dts4(s, pkt, core_size, sample_rate, blocks);
296 
297  switch (blocks) {
298  case 512 >> 5: ctx->data_type = IEC61937_DTS1; break;
299  case 1024 >> 5: ctx->data_type = IEC61937_DTS2; break;
300  case 2048 >> 5: ctx->data_type = IEC61937_DTS3; break;
301  default:
302  av_log(s, AV_LOG_ERROR, "%i samples in DTS frame not supported\n",
303  blocks << 5);
304  return AVERROR(ENOSYS);
305  }
306 
307  /* discard extraneous data by default */
308  if (core_size && core_size < pkt->size) {
309  ctx->out_bytes = core_size;
310  ctx->length_code = core_size << 3;
311  }
312 
313  ctx->pkt_offset = blocks << 7;
314 
315  if (ctx->out_bytes == ctx->pkt_offset) {
316  /* The DTS stream fits exactly into the output stream, so skip the
317  * preamble as it would not fit in there. This is the case for dts
318  * discs and dts-in-wav. */
319  ctx->use_preamble = 0;
320  } else if (ctx->out_bytes > ctx->pkt_offset - BURST_HEADER_SIZE) {
321  avpriv_request_sample(s, "Unrecognized large DTS frame");
322  /* This will fail with a "bitrate too high" in the caller */
323  }
324 
325  return 0;
326 }
327 
328 static const enum IEC61937DataType mpeg_data_type[2][3] = {
329  // LAYER1 LAYER2 LAYER3
331  { IEC61937_MPEG1_LAYER1, IEC61937_MPEG1_LAYER23, IEC61937_MPEG1_LAYER23 }, // MPEG-1
332 };
333 
335 {
337  int version = (pkt->data[1] >> 3) & 3;
338  int layer = 3 - ((pkt->data[1] >> 1) & 3);
339  int extension = pkt->data[2] & 1;
340 
341  if (layer == 3 || version == 1) {
342  av_log(s, AV_LOG_ERROR, "Wrong MPEG file format\n");
343  return AVERROR_INVALIDDATA;
344  }
345  av_log(s, AV_LOG_DEBUG, "version: %i layer: %i extension: %i\n", version, layer, extension);
346  if (version == 2 && extension) {
348  ctx->pkt_offset = 4608;
349  } else {
350  ctx->data_type = mpeg_data_type [version & 1][layer];
351  ctx->pkt_offset = spdif_mpeg_pkt_offset[version & 1][layer];
352  }
353  // TODO Data type dependent info (normal/karaoke, dynamic range control)
354  return 0;
355 }
356 
358 {
360  uint32_t samples;
361  uint8_t frames;
362  int ret;
363 
364  ret = av_adts_header_parse(pkt->data, &samples, &frames);
365  if (ret < 0) {
366  av_log(s, AV_LOG_ERROR, "Wrong AAC file format\n");
367  return ret;
368  }
369 
370  ctx->pkt_offset = samples << 2;
371  switch (frames) {
372  case 1:
374  break;
375  case 2:
377  break;
378  case 4:
380  break;
381  default:
382  av_log(s, AV_LOG_ERROR,
383  "%"PRIu32" samples in AAC frame not supported\n", samples);
384  return AVERROR(EINVAL);
385  }
386  //TODO Data type dependent info (LC profile/SBR)
387  return 0;
388 }
389 
390 
391 /*
392  * It seems Dolby TrueHD frames have to be encapsulated in MAT frames before
393  * they can be encapsulated in IEC 61937.
394  */
395 #define MAT_PKT_OFFSET 61440
396 #define MAT_FRAME_SIZE 61424
397 
398 static const uint8_t mat_start_code[20] = {
399  0x07, 0x9E, 0x00, 0x03, 0x84, 0x01, 0x01, 0x01, 0x80, 0x00, 0x56, 0xA5, 0x3B, 0xF4, 0x81, 0x83,
400  0x49, 0x80, 0x77, 0xE0,
401 };
402 static const uint8_t mat_middle_code[12] = {
403  0xC3, 0xC1, 0x42, 0x49, 0x3B, 0xFA, 0x82, 0x83, 0x49, 0x80, 0x77, 0xE0,
404 };
405 static const uint8_t mat_end_code[16] = {
406  0xC3, 0xC2, 0xC0, 0xC4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x11,
407 };
408 
409 #define MAT_CODE(position, data) { .pos = position, .code = data, .len = sizeof(data) }
410 
411 static const struct {
412  unsigned int pos;
413  const uint8_t *code;
414  unsigned int len;
415 } mat_codes[] = {
417  MAT_CODE(30708, mat_middle_code),
419 };
420 
422 {
424  uint8_t *hd_buf = ctx->hd_buf[ctx->hd_buf_idx];
425  int ratebits;
426  int padding_remaining = 0;
427  uint16_t input_timing;
428  int total_frame_size = pkt->size;
429  const uint8_t *dataptr = pkt->data;
430  int data_remaining = pkt->size;
431  int have_pkt = 0;
432  int next_code_idx;
433 
434  if (pkt->size < 10)
435  return AVERROR_INVALIDDATA;
436 
437  if (AV_RB24(pkt->data + 4) == 0xf8726f) {
438  /* major sync unit, fetch sample rate */
439  if (pkt->data[7] == 0xba)
440  ratebits = pkt->data[8] >> 4;
441  else if (pkt->data[7] == 0xbb)
442  ratebits = pkt->data[9] >> 4;
443  else
444  return AVERROR_INVALIDDATA;
445 
446  ctx->truehd_samples_per_frame = 40 << (ratebits & 3);
447  av_log(s, AV_LOG_TRACE, "TrueHD samples per frame: %d\n",
449  }
450 
451  if (!ctx->truehd_samples_per_frame)
452  return AVERROR_INVALIDDATA;
453 
454  input_timing = AV_RB16(pkt->data + 2);
455  if (ctx->truehd_prev_size) {
456  uint16_t delta_samples = input_timing - ctx->truehd_prev_time;
457  /*
458  * One multiple-of-48kHz frame is 1/1200 sec and the IEC 61937 rate
459  * is 768kHz = 768000*4 bytes/sec.
460  * The nominal space per frame is therefore
461  * (768000*4 bytes/sec) * (1/1200 sec) = 2560 bytes.
462  * For multiple-of-44.1kHz frames: 1/1102.5 sec, 705.6kHz, 2560 bytes.
463  *
464  * 2560 is divisible by truehd_samples_per_frame.
465  */
466  int delta_bytes = delta_samples * 2560 / ctx->truehd_samples_per_frame;
467 
468  /* padding needed before this frame */
469  padding_remaining = delta_bytes - ctx->truehd_prev_size;
470 
471  av_log(s, AV_LOG_TRACE, "delta_samples: %"PRIu16", delta_bytes: %d\n",
472  delta_samples, delta_bytes);
473 
474  /* sanity check */
475  if (padding_remaining < 0 || padding_remaining >= MAT_FRAME_SIZE / 2) {
476  avpriv_request_sample(s, "Unusual frame timing: %"PRIu16" => %"PRIu16", %d samples/frame",
477  ctx->truehd_prev_time, input_timing, ctx->truehd_samples_per_frame);
478  padding_remaining = 0;
479  }
480  }
481 
482  for (next_code_idx = 0; next_code_idx < FF_ARRAY_ELEMS(mat_codes); next_code_idx++)
483  if (ctx->hd_buf_filled <= mat_codes[next_code_idx].pos)
484  break;
485 
486  if (next_code_idx >= FF_ARRAY_ELEMS(mat_codes))
487  return AVERROR_BUG;
488 
489  while (padding_remaining || data_remaining ||
490  mat_codes[next_code_idx].pos == ctx->hd_buf_filled) {
491 
492  if (mat_codes[next_code_idx].pos == ctx->hd_buf_filled) {
493  /* time to insert MAT code */
494  int code_len = mat_codes[next_code_idx].len;
495  int code_len_remaining = code_len;
496  memcpy(hd_buf + mat_codes[next_code_idx].pos,
497  mat_codes[next_code_idx].code, code_len);
498  ctx->hd_buf_filled += code_len;
499 
500  next_code_idx++;
501  if (next_code_idx == FF_ARRAY_ELEMS(mat_codes)) {
502  next_code_idx = 0;
503 
504  /* this was the last code, move to the next MAT frame */
505  have_pkt = 1;
506  ctx->out_buf = hd_buf;
507  ctx->hd_buf_idx ^= 1;
508  hd_buf = ctx->hd_buf[ctx->hd_buf_idx];
509  ctx->hd_buf_filled = 0;
510 
511  /* inter-frame gap has to be counted as well, add it */
512  code_len_remaining += MAT_PKT_OFFSET - MAT_FRAME_SIZE;
513  }
514 
515  if (padding_remaining) {
516  /* consider the MAT code as padding */
517  int counted_as_padding = FFMIN(padding_remaining,
518  code_len_remaining);
519  padding_remaining -= counted_as_padding;
520  code_len_remaining -= counted_as_padding;
521  }
522  /* count the remainder of the code as part of frame size */
523  if (code_len_remaining)
524  total_frame_size += code_len_remaining;
525  }
526 
527  if (padding_remaining) {
528  int padding_to_insert = FFMIN(mat_codes[next_code_idx].pos - ctx->hd_buf_filled,
529  padding_remaining);
530 
531  memset(hd_buf + ctx->hd_buf_filled, 0, padding_to_insert);
532  ctx->hd_buf_filled += padding_to_insert;
533  padding_remaining -= padding_to_insert;
534 
535  if (padding_remaining)
536  continue; /* time to insert MAT code */
537  }
538 
539  if (data_remaining) {
540  int data_to_insert = FFMIN(mat_codes[next_code_idx].pos - ctx->hd_buf_filled,
541  data_remaining);
542 
543  memcpy(hd_buf + ctx->hd_buf_filled, dataptr, data_to_insert);
544  ctx->hd_buf_filled += data_to_insert;
545  dataptr += data_to_insert;
546  data_remaining -= data_to_insert;
547  }
548  }
549 
550  ctx->truehd_prev_size = total_frame_size;
551  ctx->truehd_prev_time = input_timing;
552 
553  av_log(s, AV_LOG_TRACE, "TrueHD frame inserted, total size %d, buffer position %d\n",
554  total_frame_size, ctx->hd_buf_filled);
555 
556  if (!have_pkt) {
557  ctx->pkt_offset = 0;
558  return 0;
559  }
560 
561  ctx->data_type = IEC61937_TRUEHD;
562  ctx->pkt_offset = MAT_PKT_OFFSET;
563  ctx->out_bytes = MAT_FRAME_SIZE;
565  return 0;
566 }
567 
569 {
571 
572  switch (s->streams[0]->codecpar->codec_id) {
573  case AV_CODEC_ID_AC3:
575  break;
576  case AV_CODEC_ID_EAC3:
578  break;
579  case AV_CODEC_ID_MP1:
580  case AV_CODEC_ID_MP2:
581  case AV_CODEC_ID_MP3:
583  break;
584  case AV_CODEC_ID_DTS:
586  break;
587  case AV_CODEC_ID_AAC:
589  break;
590  case AV_CODEC_ID_TRUEHD:
591  case AV_CODEC_ID_MLP:
593  for (int i = 0; i < FF_ARRAY_ELEMS(ctx->hd_buf); i++) {
594  ctx->hd_buf[i] = av_malloc(MAT_FRAME_SIZE);
595  if (!ctx->hd_buf[i])
596  return AVERROR(ENOMEM);
597  }
598  break;
599  default:
600  avpriv_report_missing_feature(s, "Codec %d",
601  s->streams[0]->codecpar->codec_id);
602  return AVERROR_PATCHWELCOME;
603  }
604  return 0;
605 }
606 
608 {
610  av_freep(&ctx->buffer);
611  for (int i = 0; i < FF_ARRAY_ELEMS(ctx->hd_buf); i++)
612  av_freep(&ctx->hd_buf[i]);
613 }
614 
616  AVIOContext *pb, unsigned int val)
617 {
619  avio_wb16(pb, val);
620  else
621  avio_wl16(pb, val);
622 }
623 
625 {
627  int ret, padding;
628 
629  ctx->out_buf = pkt->data;
630  ctx->out_bytes = pkt->size;
631  ctx->length_code = FFALIGN(pkt->size, 2) << 3;
632  ctx->use_preamble = 1;
633  ctx->extra_bswap = 0;
634 
635  ret = ctx->header_info(s, pkt);
636  if (ret < 0)
637  return ret;
638  if (!ctx->pkt_offset)
639  return 0;
640 
641  padding = (ctx->pkt_offset - ctx->use_preamble * BURST_HEADER_SIZE - ctx->out_bytes) & ~1;
642  if (padding < 0) {
643  av_log(s, AV_LOG_ERROR, "bitrate is too high\n");
644  return AVERROR(EINVAL);
645  }
646 
647  if (ctx->use_preamble) {
648  spdif_put_16(ctx, s->pb, SYNCWORD1); //Pa
649  spdif_put_16(ctx, s->pb, SYNCWORD2); //Pb
650  spdif_put_16(ctx, s->pb, ctx->data_type); //Pc
651  spdif_put_16(ctx, s->pb, ctx->length_code);//Pd
652  }
653 
654  if (ctx->extra_bswap ^ (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)) {
655  avio_write(s->pb, ctx->out_buf, ctx->out_bytes & ~1);
656  } else {
658  if (!ctx->buffer)
659  return AVERROR(ENOMEM);
660  ff_spdif_bswap_buf16((uint16_t *)ctx->buffer, (uint16_t *)ctx->out_buf, ctx->out_bytes >> 1);
661  avio_write(s->pb, ctx->buffer, ctx->out_bytes & ~1);
662  }
663 
664  /* a final lone byte has to be MSB aligned */
665  if (ctx->out_bytes & 1)
666  spdif_put_16(ctx, s->pb, ctx->out_buf[ctx->out_bytes - 1] << 8);
667 
668  ffio_fill(s->pb, 0, padding);
669 
670  av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n",
671  ctx->data_type, ctx->out_bytes, ctx->pkt_offset);
672 
673  return 0;
674 }
675 
677  .name = "spdif",
678  .long_name = NULL_IF_CONFIG_SMALL("IEC 61937 (used on S/PDIF - IEC958)"),
679  .extensions = "spdif",
680  .priv_data_size = sizeof(IEC61937Context),
681  .audio_codec = AV_CODEC_ID_AC3,
682  .video_codec = AV_CODEC_ID_NONE,
685  .deinit = spdif_deinit,
687  .priv_class = &spdif_class,
688 };
MPEG-2 AAC ADTS half-rate low sampling frequency.
Definition: spdif.h:49
uint8_t * out_buf
pointer to the outgoing data before byte-swapping
Definition: spdifenc.c:66
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:702
int hd_buf_idx
active hd buffer index (truehd)
Definition: spdifenc.c:76
uint8_t * hd_buf[2]
allocated buffers to concatenate hd audio frames
Definition: spdifenc.c:72
#define NULL
Definition: coverity.c:32
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:447
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
version
Definition: libkvazaar.c:292
int size
int truehd_prev_size
previous frame size in bytes, including any MAT codes
Definition: spdifenc.c:81
AVOption.
Definition: opt.h:246
int pkt_offset
data burst repetition period in bytes
Definition: spdifenc.c:62
static int spdif_header_mpeg(AVFormatContext *s, AVPacket *pkt)
Definition: spdifenc.c:334
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
#define BURST_HEADER_SIZE
Definition: spdif.h:30
MPEG-2, layer-1 low sampling frequency.
Definition: spdif.h:38
static int spdif_dts4_subtype(int period)
Definition: spdifenc.c:161
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int size
Definition: packet.h:356
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static const uint8_t mat_start_code[20]
Definition: spdifenc.c:398
#define AV_RB24
Definition: intreadwrite.h:64
IEC61937DataType
Definition: spdif.h:32
#define AV_RL16
Definition: intreadwrite.h:42
static int spdif_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: spdifenc.c:624
int truehd_samples_per_frame
samples per frame for padding calculation
Definition: spdifenc.c:82
static AVPacket pkt
static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt)
Definition: spdifenc.c:251
void ff_spdif_bswap_buf16(uint16_t *dst, const uint16_t *src, int w)
Definition: spdif.c:26
static int spdif_header_eac3(AVFormatContext *s, AVPacket *pkt)
Definition: spdifenc.c:120
static const uint8_t mat_middle_code[12]
Definition: spdifenc.c:402
int buffer_size
size of allocated buffer
Definition: spdifenc.c:64
Format I/O context.
Definition: avformat.h:1351
static void spdif_deinit(AVFormatContext *s)
Definition: spdifenc.c:607
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
int av_adts_header_parse(const uint8_t *buf, uint32_t *samples, uint8_t *frames)
Extract the number of samples and frames from AAC data.
Definition: adts_parser.c:27
static const AVClass spdif_class
Definition: spdifenc.c:103
MPEG-2 AAC ADTS.
Definition: spdif.h:37
uint8_t
#define av_malloc(s)
AVOptions.
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
#define AV_RB32
Definition: intreadwrite.h:130
#define DCA_SYNCWORD_CORE_14B_BE
Definition: dca_syncwords.h:24
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
AVOutputFormat ff_spdif_muxer
Definition: spdifenc.c:676
uint8_t * data
Definition: packet.h:355
#define SPDIF_FLAG_BIGENDIAN
Definition: spdifenc.c:87
DTS type II (1024 samples)
Definition: spdif.h:42
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:213
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
#define FFALIGN(x, a)
Definition: macros.h:48
TrueHD data.
Definition: spdif.h:52
#define av_log(a,...)
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:276
#define DCA_SYNCWORD_CORE_BE
Definition: dca_syncwords.h:22
DTS HD data.
Definition: spdif.h:47
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
DTS type III (2048 samples)
Definition: spdif.h:43
const AVClass * av_class
Definition: spdifenc.c:59
#define AV_RB16
Definition: intreadwrite.h:53
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
int(* header_info)(AVFormatContext *s, AVPacket *pkt)
function, which generates codec dependent header information.
Definition: spdifenc.c:92
const uint8_t * code
Definition: spdifenc.c:413
unsigned int pos
Definition: spdifenc.c:412
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:411
MPEG-1 layer 2 or 3 data or MPEG-2 without extension.
Definition: spdif.h:35
MPEG-2, layer-3 low sampling frequency.
Definition: spdif.h:40
int hd_buf_count
number of frames in the hd audio buffer (eac3)
Definition: spdifenc.c:74
#define DCA_SYNCWORD_CORE_14B_LE
Definition: dca_syncwords.h:25
MPEG-1 layer 1.
Definition: spdif.h:34
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: mem.c:502
#define MAT_CODE(position, data)
Definition: spdifenc.c:409
void ffio_fill(AVIOContext *s, int b, int count)
Definition: aviobuf.c:199
#define FFMIN(a, b)
Definition: common.h:96
uint8_t * buffer
allocated buffer, used for swap bytes
Definition: spdifenc.c:63
int out_bytes
amount of outgoing bytes
Definition: spdifenc.c:67
const char * name
Definition: avformat.h:500
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
void * av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
Reallocate the given buffer if it is not large enough, otherwise do nothing.
Definition: mem.c:478
int dtshd_fallback
Definition: spdifenc.c:86
int frames
Definition: movenc.c:65
const uint32_t avpriv_dca_sample_rates[16]
Definition: dca.c:36
static av_always_inline void spdif_put_16(IEC61937Context *ctx, AVIOContext *pb, unsigned int val)
Definition: spdifenc.c:615
enum IEC61937DataType data_type
burst info - reference to type of payload of the data-burst
Definition: spdifenc.c:60
static enum IEC61937DataType mpeg_data_type[2][3]
Definition: spdifenc.c:328
#define FF_ARRAY_ELEMS(a)
#define SYNCWORD2
Definition: spdif.h:29
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:462
static const AVOption options[]
Definition: spdifenc.c:95
sample_rate
#define MAT_FRAME_SIZE
Definition: spdifenc.c:396
static int spdif_write_header(AVFormatContext *s)
Definition: spdifenc.c:568
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
int use_preamble
preamble enabled (disabled for exactly pre-padded DTS)
Definition: spdifenc.c:69
#define DCA_SYNCWORD_CORE_LE
Definition: dca_syncwords.h:23
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
int hd_buf_filled
amount of bytes in the hd audio buffer (eac3, truehd)
Definition: spdifenc.c:75
Describe the class of an AVClass context structure.
Definition: log.h:67
int length_code
length code in bits or bytes, depending on data type
Definition: spdifenc.c:61
static int spdif_header_truehd(AVFormatContext *s, AVPacket *pkt)
Definition: spdifenc.c:421
DTS type I (512 samples)
Definition: spdif.h:41
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:453
#define flags(name, subs,...)
Definition: cbs_av1.c:565
MPEG-2, layer-2 low sampling frequency.
Definition: spdif.h:39
static int spdif_header_aac(AVFormatContext *s, AVPacket *pkt)
Definition: spdifenc.c:357
E-AC-3 data.
Definition: spdif.h:51
#define AC3_FRAME_SIZE
Definition: ac3.h:38
Main libavformat public API header.
int
unsigned int len
Definition: spdifenc.c:414
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:215
MPEG-2 data with extension.
Definition: spdif.h:36
static const uint8_t mat_end_code[16]
Definition: spdifenc.c:405
int dtshd_skip
counter used for skipping DTS-HD frames
Definition: spdifenc.c:78
int hd_buf_size
size of the hd audio buffer (eac3, dts4)
Definition: spdifenc.c:73
MPEG-2 AAC ADTS quarter-rate low sampling frequency.
Definition: spdif.h:50
static const uint16_t spdif_mpeg_pkt_offset[2][3]
Definition: spdif.h:55
#define SYNCWORD1
Definition: spdif.h:28
void * priv_data
Format private data.
Definition: avformat.h:1379
#define DCA_SYNCWORD_SUBSTREAM
Definition: dca_syncwords.h:32
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:346
static const struct @279 mat_codes[]
static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt)
Definition: spdifenc.c:110
AC-3 data.
Definition: spdif.h:33
static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size, int sample_rate, int blocks)
Definition: spdifenc.c:174
#define av_freep(p)
#define av_always_inline
Definition: attributes.h:45
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
uint16_t truehd_prev_time
input_timing from the last frame
Definition: spdifenc.c:80
int extra_bswap
extra bswap for payload (for LE DTS => standard BE DTS)
Definition: spdifenc.c:70
static double val(void *priv, double ch)
Definition: aeval.c:76
This structure stores compressed data.
Definition: packet.h:332
Common code between the AC-3 encoder and decoder.
#define MAT_PKT_OFFSET
Definition: spdifenc.c:395
static uint8_t tmp[11]
Definition: aes_ctr.c:26