FFmpeg  4.3
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 
126  int bsid = pkt->data[5] >> 3;
127  if (bsid > 10 && (pkt->data[4] & 0xc0) != 0xc0) /* fscod */
128  repeat = eac3_repeat[(pkt->data[4] & 0x30) >> 4]; /* numblkscod */
129 
130  ctx->hd_buf[0] = av_fast_realloc(ctx->hd_buf[0], &ctx->hd_buf_size, ctx->hd_buf_filled + pkt->size);
131  if (!ctx->hd_buf[0])
132  return AVERROR(ENOMEM);
133 
134  memcpy(&ctx->hd_buf[0][ctx->hd_buf_filled], pkt->data, pkt->size);
135 
136  ctx->hd_buf_filled += pkt->size;
137  if (++ctx->hd_buf_count < repeat){
138  ctx->pkt_offset = 0;
139  return 0;
140  }
141  ctx->data_type = IEC61937_EAC3;
142  ctx->pkt_offset = 24576;
143  ctx->out_buf = ctx->hd_buf[0];
144  ctx->out_bytes = ctx->hd_buf_filled;
145  ctx->length_code = ctx->hd_buf_filled;
146 
147  ctx->hd_buf_count = 0;
148  ctx->hd_buf_filled = 0;
149  return 0;
150 }
151 
152 /*
153  * DTS type IV (DTS-HD) can be transmitted with various frame repetition
154  * periods; longer repetition periods allow for longer packets and therefore
155  * higher bitrate. Longer repetition periods mean that the constant bitrate of
156  * the output IEC 61937 stream is higher.
157  * The repetition period is measured in IEC 60958 frames (4 bytes).
158  */
159 static int spdif_dts4_subtype(int period)
160 {
161  switch (period) {
162  case 512: return 0x0;
163  case 1024: return 0x1;
164  case 2048: return 0x2;
165  case 4096: return 0x3;
166  case 8192: return 0x4;
167  case 16384: return 0x5;
168  }
169  return -1;
170 }
171 
172 static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size,
173  int sample_rate, int blocks)
174 {
176  static const char dtshd_start_code[10] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe };
177  int pkt_size = pkt->size;
178  int period;
179  int subtype;
180 
181  if (!core_size) {
182  av_log(s, AV_LOG_ERROR, "HD mode not supported for this format\n");
183  return AVERROR(EINVAL);
184  }
185 
186  if (!sample_rate) {
187  av_log(s, AV_LOG_ERROR, "Unknown DTS sample rate for HD\n");
188  return AVERROR_INVALIDDATA;
189  }
190 
191  period = ctx->dtshd_rate * (blocks << 5) / sample_rate;
192  subtype = spdif_dts4_subtype(period);
193 
194  if (subtype < 0) {
195  av_log(s, AV_LOG_ERROR, "Specified HD rate of %d Hz would require an "
196  "impossible repetition period of %d for the current DTS stream"
197  " (blocks = %d, sample rate = %d)\n", ctx->dtshd_rate, period,
198  blocks << 5, sample_rate);
199  return AVERROR(EINVAL);
200  }
201 
202  /* set pkt_offset and DTS IV subtype according to the requested output
203  * rate */
204  ctx->pkt_offset = period * 4;
205  ctx->data_type = IEC61937_DTSHD | subtype << 8;
206 
207  /* If the bitrate is too high for transmitting at the selected
208  * repetition period setting, strip DTS-HD until a good amount
209  * of consecutive non-overflowing HD frames have been observed.
210  * This generally only happens if the caller is cramming a Master
211  * Audio stream into 192kHz IEC 60958 (which may or may not fit). */
212  if (sizeof(dtshd_start_code) + 2 + pkt_size
213  > ctx->pkt_offset - BURST_HEADER_SIZE && core_size) {
214  if (!ctx->dtshd_skip)
215  av_log(s, AV_LOG_WARNING, "DTS-HD bitrate too high, "
216  "temporarily sending core only\n");
217  if (ctx->dtshd_fallback > 0)
218  ctx->dtshd_skip = sample_rate * ctx->dtshd_fallback / (blocks << 5);
219  else
220  /* skip permanently (dtshd_fallback == -1) or just once
221  * (dtshd_fallback == 0) */
222  ctx->dtshd_skip = 1;
223  }
224  if (ctx->dtshd_skip && core_size) {
225  pkt_size = core_size;
226  if (ctx->dtshd_fallback >= 0)
227  --ctx->dtshd_skip;
228  }
229 
230  ctx->out_bytes = sizeof(dtshd_start_code) + 2 + pkt_size;
231 
232  /* Align so that (length_code & 0xf) == 0x8. This is reportedly needed
233  * with some receivers, but the exact requirement is unconfirmed. */
234  ctx->length_code = FFALIGN(ctx->out_bytes + 0x8, 0x10) - 0x8;
235 
236  av_fast_malloc(&ctx->hd_buf[0], &ctx->hd_buf_size, ctx->out_bytes);
237  if (!ctx->hd_buf[0])
238  return AVERROR(ENOMEM);
239 
240  ctx->out_buf = ctx->hd_buf[0];
241 
242  memcpy(ctx->hd_buf[0], dtshd_start_code, sizeof(dtshd_start_code));
243  AV_WB16(ctx->hd_buf[0] + sizeof(dtshd_start_code), pkt_size);
244  memcpy(ctx->hd_buf[0] + sizeof(dtshd_start_code) + 2, pkt->data, pkt_size);
245 
246  return 0;
247 }
248 
250 {
252  uint32_t syncword_dts = AV_RB32(pkt->data);
253  int blocks;
254  int sample_rate = 0;
255  int core_size = 0;
256 
257  if (pkt->size < 9)
258  return AVERROR_INVALIDDATA;
259 
260  switch (syncword_dts) {
262  blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f;
263  core_size = ((AV_RB24(pkt->data + 5) >> 4) & 0x3fff) + 1;
264  sample_rate = avpriv_dca_sample_rates[(pkt->data[8] >> 2) & 0x0f];
265  break;
267  blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f;
268  ctx->extra_bswap = 1;
269  break;
271  blocks =
272  (((pkt->data[5] & 0x07) << 4) | ((pkt->data[6] & 0x3f) >> 2));
273  break;
275  blocks =
276  (((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2));
277  ctx->extra_bswap = 1;
278  break;
280  /* We only handle HD frames that are paired with core. However,
281  sometimes DTS-HD streams with core have a stray HD frame without
282  core in the beginning of the stream. */
283  av_log(s, AV_LOG_ERROR, "stray DTS-HD frame\n");
284  return AVERROR_INVALIDDATA;
285  default:
286  av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%"PRIx32"\n", syncword_dts);
287  return AVERROR_INVALIDDATA;
288  }
289  blocks++;
290 
291  if (ctx->dtshd_rate)
292  /* DTS type IV output requested */
293  return spdif_header_dts4(s, pkt, core_size, sample_rate, blocks);
294 
295  switch (blocks) {
296  case 512 >> 5: ctx->data_type = IEC61937_DTS1; break;
297  case 1024 >> 5: ctx->data_type = IEC61937_DTS2; break;
298  case 2048 >> 5: ctx->data_type = IEC61937_DTS3; break;
299  default:
300  av_log(s, AV_LOG_ERROR, "%i samples in DTS frame not supported\n",
301  blocks << 5);
302  return AVERROR(ENOSYS);
303  }
304 
305  /* discard extraneous data by default */
306  if (core_size && core_size < pkt->size) {
307  ctx->out_bytes = core_size;
308  ctx->length_code = core_size << 3;
309  }
310 
311  ctx->pkt_offset = blocks << 7;
312 
313  if (ctx->out_bytes == ctx->pkt_offset) {
314  /* The DTS stream fits exactly into the output stream, so skip the
315  * preamble as it would not fit in there. This is the case for dts
316  * discs and dts-in-wav. */
317  ctx->use_preamble = 0;
318  } else if (ctx->out_bytes > ctx->pkt_offset - BURST_HEADER_SIZE) {
319  avpriv_request_sample(s, "Unrecognized large DTS frame");
320  /* This will fail with a "bitrate too high" in the caller */
321  }
322 
323  return 0;
324 }
325 
326 static const enum IEC61937DataType mpeg_data_type[2][3] = {
327  // LAYER1 LAYER2 LAYER3
329  { IEC61937_MPEG1_LAYER1, IEC61937_MPEG1_LAYER23, IEC61937_MPEG1_LAYER23 }, // MPEG-1
330 };
331 
333 {
335  int version = (pkt->data[1] >> 3) & 3;
336  int layer = 3 - ((pkt->data[1] >> 1) & 3);
337  int extension = pkt->data[2] & 1;
338 
339  if (layer == 3 || version == 1) {
340  av_log(s, AV_LOG_ERROR, "Wrong MPEG file format\n");
341  return AVERROR_INVALIDDATA;
342  }
343  av_log(s, AV_LOG_DEBUG, "version: %i layer: %i extension: %i\n", version, layer, extension);
344  if (version == 2 && extension) {
346  ctx->pkt_offset = 4608;
347  } else {
348  ctx->data_type = mpeg_data_type [version & 1][layer];
349  ctx->pkt_offset = spdif_mpeg_pkt_offset[version & 1][layer];
350  }
351  // TODO Data type dependent info (normal/karaoke, dynamic range control)
352  return 0;
353 }
354 
356 {
358  uint32_t samples;
359  uint8_t frames;
360  int ret;
361 
362  ret = av_adts_header_parse(pkt->data, &samples, &frames);
363  if (ret < 0) {
364  av_log(s, AV_LOG_ERROR, "Wrong AAC file format\n");
365  return ret;
366  }
367 
368  ctx->pkt_offset = samples << 2;
369  switch (frames) {
370  case 1:
372  break;
373  case 2:
375  break;
376  case 4:
378  break;
379  default:
380  av_log(s, AV_LOG_ERROR,
381  "%"PRIu32" samples in AAC frame not supported\n", samples);
382  return AVERROR(EINVAL);
383  }
384  //TODO Data type dependent info (LC profile/SBR)
385  return 0;
386 }
387 
388 
389 /*
390  * It seems Dolby TrueHD frames have to be encapsulated in MAT frames before
391  * they can be encapsulated in IEC 61937.
392  */
393 #define MAT_PKT_OFFSET 61440
394 #define MAT_FRAME_SIZE 61424
395 
396 static const uint8_t mat_start_code[20] = {
397  0x07, 0x9E, 0x00, 0x03, 0x84, 0x01, 0x01, 0x01, 0x80, 0x00, 0x56, 0xA5, 0x3B, 0xF4, 0x81, 0x83,
398  0x49, 0x80, 0x77, 0xE0,
399 };
400 static const uint8_t mat_middle_code[12] = {
401  0xC3, 0xC1, 0x42, 0x49, 0x3B, 0xFA, 0x82, 0x83, 0x49, 0x80, 0x77, 0xE0,
402 };
403 static const uint8_t mat_end_code[16] = {
404  0xC3, 0xC2, 0xC0, 0xC4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x11,
405 };
406 
407 #define MAT_CODE(position, data) { .pos = position, .code = data, .len = sizeof(data) }
408 
409 static const struct {
410  unsigned int pos;
411  const uint8_t *code;
412  unsigned int len;
413 } mat_codes[] = {
415  MAT_CODE(30708, mat_middle_code),
417 };
418 
420 {
422  uint8_t *hd_buf = ctx->hd_buf[ctx->hd_buf_idx];
423  int ratebits;
424  int padding_remaining = 0;
425  uint16_t input_timing;
426  int total_frame_size = pkt->size;
427  const uint8_t *dataptr = pkt->data;
428  int data_remaining = pkt->size;
429  int have_pkt = 0;
430  int next_code_idx;
431 
432  if (pkt->size < 10)
433  return AVERROR_INVALIDDATA;
434 
435  if (AV_RB24(pkt->data + 4) == 0xf8726f) {
436  /* major sync unit, fetch sample rate */
437  if (pkt->data[7] == 0xba)
438  ratebits = pkt->data[8] >> 4;
439  else if (pkt->data[7] == 0xbb)
440  ratebits = pkt->data[9] >> 4;
441  else
442  return AVERROR_INVALIDDATA;
443 
444  ctx->truehd_samples_per_frame = 40 << (ratebits & 3);
445  av_log(s, AV_LOG_TRACE, "TrueHD samples per frame: %d\n",
447  }
448 
449  if (!ctx->truehd_samples_per_frame)
450  return AVERROR_INVALIDDATA;
451 
452  input_timing = AV_RB16(pkt->data + 2);
453  if (ctx->truehd_prev_size) {
454  uint16_t delta_samples = input_timing - ctx->truehd_prev_time;
455  /*
456  * One multiple-of-48kHz frame is 1/1200 sec and the IEC 61937 rate
457  * is 768kHz = 768000*4 bytes/sec.
458  * The nominal space per frame is therefore
459  * (768000*4 bytes/sec) * (1/1200 sec) = 2560 bytes.
460  * For multiple-of-44.1kHz frames: 1/1102.5 sec, 705.6kHz, 2560 bytes.
461  *
462  * 2560 is divisible by truehd_samples_per_frame.
463  */
464  int delta_bytes = delta_samples * 2560 / ctx->truehd_samples_per_frame;
465 
466  /* padding needed before this frame */
467  padding_remaining = delta_bytes - ctx->truehd_prev_size;
468 
469  av_log(s, AV_LOG_TRACE, "delta_samples: %"PRIu16", delta_bytes: %d\n",
470  delta_samples, delta_bytes);
471 
472  /* sanity check */
473  if (padding_remaining < 0 || padding_remaining >= MAT_FRAME_SIZE / 2) {
474  avpriv_request_sample(s, "Unusual frame timing: %"PRIu16" => %"PRIu16", %d samples/frame",
475  ctx->truehd_prev_time, input_timing, ctx->truehd_samples_per_frame);
476  padding_remaining = 0;
477  }
478  }
479 
480  for (next_code_idx = 0; next_code_idx < FF_ARRAY_ELEMS(mat_codes); next_code_idx++)
481  if (ctx->hd_buf_filled <= mat_codes[next_code_idx].pos)
482  break;
483 
484  if (next_code_idx >= FF_ARRAY_ELEMS(mat_codes))
485  return AVERROR_BUG;
486 
487  while (padding_remaining || data_remaining ||
488  mat_codes[next_code_idx].pos == ctx->hd_buf_filled) {
489 
490  if (mat_codes[next_code_idx].pos == ctx->hd_buf_filled) {
491  /* time to insert MAT code */
492  int code_len = mat_codes[next_code_idx].len;
493  int code_len_remaining = code_len;
494  memcpy(hd_buf + mat_codes[next_code_idx].pos,
495  mat_codes[next_code_idx].code, code_len);
496  ctx->hd_buf_filled += code_len;
497 
498  next_code_idx++;
499  if (next_code_idx == FF_ARRAY_ELEMS(mat_codes)) {
500  next_code_idx = 0;
501 
502  /* this was the last code, move to the next MAT frame */
503  have_pkt = 1;
504  ctx->out_buf = hd_buf;
505  ctx->hd_buf_idx ^= 1;
506  hd_buf = ctx->hd_buf[ctx->hd_buf_idx];
507  ctx->hd_buf_filled = 0;
508 
509  /* inter-frame gap has to be counted as well, add it */
510  code_len_remaining += MAT_PKT_OFFSET - MAT_FRAME_SIZE;
511  }
512 
513  if (padding_remaining) {
514  /* consider the MAT code as padding */
515  int counted_as_padding = FFMIN(padding_remaining,
516  code_len_remaining);
517  padding_remaining -= counted_as_padding;
518  code_len_remaining -= counted_as_padding;
519  }
520  /* count the remainder of the code as part of frame size */
521  if (code_len_remaining)
522  total_frame_size += code_len_remaining;
523  }
524 
525  if (padding_remaining) {
526  int padding_to_insert = FFMIN(mat_codes[next_code_idx].pos - ctx->hd_buf_filled,
527  padding_remaining);
528 
529  memset(hd_buf + ctx->hd_buf_filled, 0, padding_to_insert);
530  ctx->hd_buf_filled += padding_to_insert;
531  padding_remaining -= padding_to_insert;
532 
533  if (padding_remaining)
534  continue; /* time to insert MAT code */
535  }
536 
537  if (data_remaining) {
538  int data_to_insert = FFMIN(mat_codes[next_code_idx].pos - ctx->hd_buf_filled,
539  data_remaining);
540 
541  memcpy(hd_buf + ctx->hd_buf_filled, dataptr, data_to_insert);
542  ctx->hd_buf_filled += data_to_insert;
543  dataptr += data_to_insert;
544  data_remaining -= data_to_insert;
545  }
546  }
547 
548  ctx->truehd_prev_size = total_frame_size;
549  ctx->truehd_prev_time = input_timing;
550 
551  av_log(s, AV_LOG_TRACE, "TrueHD frame inserted, total size %d, buffer position %d\n",
552  total_frame_size, ctx->hd_buf_filled);
553 
554  if (!have_pkt) {
555  ctx->pkt_offset = 0;
556  return 0;
557  }
558 
559  ctx->data_type = IEC61937_TRUEHD;
560  ctx->pkt_offset = MAT_PKT_OFFSET;
561  ctx->out_bytes = MAT_FRAME_SIZE;
563  return 0;
564 }
565 
567 {
569 
570  switch (s->streams[0]->codecpar->codec_id) {
571  case AV_CODEC_ID_AC3:
573  break;
574  case AV_CODEC_ID_EAC3:
576  break;
577  case AV_CODEC_ID_MP1:
578  case AV_CODEC_ID_MP2:
579  case AV_CODEC_ID_MP3:
581  break;
582  case AV_CODEC_ID_DTS:
584  break;
585  case AV_CODEC_ID_AAC:
587  break;
588  case AV_CODEC_ID_TRUEHD:
589  case AV_CODEC_ID_MLP:
591  for (int i = 0; i < FF_ARRAY_ELEMS(ctx->hd_buf); i++) {
592  ctx->hd_buf[i] = av_malloc(MAT_FRAME_SIZE);
593  if (!ctx->hd_buf[i])
594  return AVERROR(ENOMEM);
595  }
596  break;
597  default:
598  avpriv_report_missing_feature(s, "Codec %d",
599  s->streams[0]->codecpar->codec_id);
600  return AVERROR_PATCHWELCOME;
601  }
602  return 0;
603 }
604 
606 {
608  av_freep(&ctx->buffer);
609  for (int i = 0; i < FF_ARRAY_ELEMS(ctx->hd_buf); i++)
610  av_freep(&ctx->hd_buf[i]);
611 }
612 
614  AVIOContext *pb, unsigned int val)
615 {
617  avio_wb16(pb, val);
618  else
619  avio_wl16(pb, val);
620 }
621 
623 {
625  int ret, padding;
626 
627  ctx->out_buf = pkt->data;
628  ctx->out_bytes = pkt->size;
629  ctx->length_code = FFALIGN(pkt->size, 2) << 3;
630  ctx->use_preamble = 1;
631  ctx->extra_bswap = 0;
632 
633  ret = ctx->header_info(s, pkt);
634  if (ret < 0)
635  return ret;
636  if (!ctx->pkt_offset)
637  return 0;
638 
639  padding = (ctx->pkt_offset - ctx->use_preamble * BURST_HEADER_SIZE - ctx->out_bytes) & ~1;
640  if (padding < 0) {
641  av_log(s, AV_LOG_ERROR, "bitrate is too high\n");
642  return AVERROR(EINVAL);
643  }
644 
645  if (ctx->use_preamble) {
646  spdif_put_16(ctx, s->pb, SYNCWORD1); //Pa
647  spdif_put_16(ctx, s->pb, SYNCWORD2); //Pb
648  spdif_put_16(ctx, s->pb, ctx->data_type); //Pc
649  spdif_put_16(ctx, s->pb, ctx->length_code);//Pd
650  }
651 
652  if (ctx->extra_bswap ^ (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)) {
653  avio_write(s->pb, ctx->out_buf, ctx->out_bytes & ~1);
654  } else {
656  if (!ctx->buffer)
657  return AVERROR(ENOMEM);
658  ff_spdif_bswap_buf16((uint16_t *)ctx->buffer, (uint16_t *)ctx->out_buf, ctx->out_bytes >> 1);
659  avio_write(s->pb, ctx->buffer, ctx->out_bytes & ~1);
660  }
661 
662  /* a final lone byte has to be MSB aligned */
663  if (ctx->out_bytes & 1)
664  spdif_put_16(ctx, s->pb, ctx->out_buf[ctx->out_bytes - 1] << 8);
665 
666  ffio_fill(s->pb, 0, padding);
667 
668  av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n",
669  ctx->data_type, ctx->out_bytes, ctx->pkt_offset);
670 
671  return 0;
672 }
673 
675  .name = "spdif",
676  .long_name = NULL_IF_CONFIG_SMALL("IEC 61937 (used on S/PDIF - IEC958)"),
677  .extensions = "spdif",
678  .priv_data_size = sizeof(IEC61937Context),
679  .audio_codec = AV_CODEC_ID_AC3,
680  .video_codec = AV_CODEC_ID_NONE,
683  .deinit = spdif_deinit,
685  .priv_class = &spdif_class,
686 };
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:701
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:332
#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:159
#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:396
#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:622
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:249
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:400
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:605
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:674
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:186
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:411
unsigned int pos
Definition: spdifenc.c:410
#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:504
#define MAT_CODE(position, data)
Definition: spdifenc.c:407
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:480
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:613
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:326
#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:394
static int spdif_write_header(AVFormatContext *s)
Definition: spdifenc.c:566
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:419
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:564
MPEG-2, layer-2 low sampling frequency.
Definition: spdif.h:39
static int spdif_header_aac(AVFormatContext *s, AVPacket *pkt)
Definition: spdifenc.c:355
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:412
#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:403
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:172
#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:393