spdifenc: set flag AVFMT_NOTIMESTAMPS
[libav.git] / libavformat / spdifenc.c
1 /*
2 * IEC 61937 muxer
3 * Copyright (c) 2009 Bartlomiej Wolowiec
4 * Copyright (c) 2010 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-preambule - IEC61937 frame header, contains 16-bits 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 "avformat.h"
48 #include "spdif.h"
49 #include "libavcodec/ac3.h"
50 #include "libavcodec/dca.h"
51 #include "libavcodec/dcadata.h"
52 #include "libavcodec/aacadtsdec.h"
53 #include "libavutil/opt.h"
54
55 typedef struct IEC61937Context {
56 const AVClass *av_class;
57 enum IEC61937DataType data_type;///< burst info - reference to type of payload of the data-burst
58 int length_code; ///< length code in bits or bytes, depending on data type
59 int pkt_offset; ///< data burst repetition period in bytes
60 uint8_t *buffer; ///< allocated buffer, used for swap bytes
61 int buffer_size; ///< size of allocated buffer
62
63 uint8_t *out_buf; ///< pointer to the outgoing data before byte-swapping
64 int out_bytes; ///< amount of outgoing bytes
65
66 int use_preamble; ///< preamble enabled (disabled for exactly pre-padded DTS)
67 int extra_bswap; ///< extra bswap for payload (for LE DTS => standard BE DTS)
68
69 uint8_t *hd_buf; ///< allocated buffer to concatenate hd audio frames
70 int hd_buf_size; ///< size of the hd audio buffer
71 int hd_buf_count; ///< number of frames in the hd audio buffer
72 int hd_buf_filled; ///< amount of bytes in the hd audio buffer
73
74 int dtshd_skip; ///< counter used for skipping DTS-HD frames
75
76 /* AVOptions: */
77 int dtshd_rate;
78 int dtshd_fallback;
79 #define SPDIF_FLAG_BIGENDIAN 0x01
80 int spdif_flags;
81
82 /// function, which generates codec dependent header information.
83 /// Sets data_type and pkt_offset, and length_code, out_bytes, out_buf if necessary
84 int (*header_info) (AVFormatContext *s, AVPacket *pkt);
85 } IEC61937Context;
86
87 static const AVOption options[] = {
88 { "spdif_flags", "IEC 61937 encapsulation flags", offsetof(IEC61937Context, spdif_flags), FF_OPT_TYPE_FLAGS, 0, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" },
89 { "be", "output in big-endian format (for use as s16be)", 0, FF_OPT_TYPE_CONST, SPDIF_FLAG_BIGENDIAN, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" },
90 { "dtshd_rate", "mux complete DTS frames in HD mode at the specified IEC958 rate (in Hz, default 0=disabled)", offsetof(IEC61937Context, dtshd_rate), FF_OPT_TYPE_INT, 0, 0, 768000, AV_OPT_FLAG_ENCODING_PARAM },
91 { "dtshd_fallback_time", "min secs to strip HD for after an overflow (-1: till the end, default 60)", offsetof(IEC61937Context, dtshd_fallback), FF_OPT_TYPE_INT, 60, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
92 { NULL },
93 };
94
95 static const AVClass class = { "spdif", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
96
97 static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt)
98 {
99 IEC61937Context *ctx = s->priv_data;
100 int bitstream_mode = pkt->data[5] & 0x7;
101
102 ctx->data_type = IEC61937_AC3 | (bitstream_mode << 8);
103 ctx->pkt_offset = AC3_FRAME_SIZE << 2;
104 return 0;
105 }
106
107 static int spdif_header_eac3(AVFormatContext *s, AVPacket *pkt)
108 {
109 IEC61937Context *ctx = s->priv_data;
110 static const uint8_t eac3_repeat[4] = {6, 3, 2, 1};
111 int repeat = 1;
112
113 if ((pkt->data[4] & 0xc0) != 0xc0) /* fscod */
114 repeat = eac3_repeat[(pkt->data[4] & 0x30) >> 4]; /* numblkscod */
115
116 ctx->hd_buf = av_fast_realloc(ctx->hd_buf, &ctx->hd_buf_size, ctx->hd_buf_filled + pkt->size);
117 if (!ctx->hd_buf)
118 return AVERROR(ENOMEM);
119
120 memcpy(&ctx->hd_buf[ctx->hd_buf_filled], pkt->data, pkt->size);
121
122 ctx->hd_buf_filled += pkt->size;
123 if (++ctx->hd_buf_count < repeat){
124 ctx->pkt_offset = 0;
125 return 0;
126 }
127 ctx->data_type = IEC61937_EAC3;
128 ctx->pkt_offset = 24576;
129 ctx->out_buf = ctx->hd_buf;
130 ctx->out_bytes = ctx->hd_buf_filled;
131 ctx->length_code = ctx->hd_buf_filled;
132
133 ctx->hd_buf_count = 0;
134 ctx->hd_buf_filled = 0;
135 return 0;
136 }
137
138 /*
139 * DTS type IV (DTS-HD) can be transmitted with various frame repetition
140 * periods; longer repetition periods allow for longer packets and therefore
141 * higher bitrate. Longer repetition periods mean that the constant bitrate of
142 * the outputted IEC 61937 stream is higher.
143 * The repetition period is measured in IEC 60958 frames (4 bytes).
144 */
145 static int spdif_dts4_subtype(int period)
146 {
147 switch (period) {
148 case 512: return 0x0;
149 case 1024: return 0x1;
150 case 2048: return 0x2;
151 case 4096: return 0x3;
152 case 8192: return 0x4;
153 case 16384: return 0x5;
154 }
155 return -1;
156 }
157
158 static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size,
159 int sample_rate, int blocks)
160 {
161 IEC61937Context *ctx = s->priv_data;
162 static const char dtshd_start_code[10] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe };
163 int pkt_size = pkt->size;
164 int period;
165 int subtype;
166
167 if (!core_size) {
168 av_log(s, AV_LOG_ERROR, "HD mode not supported for this format\n");
169 return AVERROR(EINVAL);
170 }
171
172 if (!sample_rate) {
173 av_log(s, AV_LOG_ERROR, "Unknown DTS sample rate for HD\n");
174 return AVERROR_INVALIDDATA;
175 }
176
177 period = ctx->dtshd_rate * (blocks << 5) / sample_rate;
178 subtype = spdif_dts4_subtype(period);
179
180 if (subtype < 0) {
181 av_log(s, AV_LOG_ERROR, "Specified HD rate of %d Hz would require an "
182 "impossible repetition period of %d for the current DTS stream"
183 " (blocks = %d, sample rate = %d)\n", ctx->dtshd_rate, period,
184 blocks << 5, sample_rate);
185 return AVERROR(EINVAL);
186 }
187
188 /* set pkt_offset and DTS IV subtype according to the requested output
189 * rate */
190 ctx->pkt_offset = period * 4;
191 ctx->data_type = IEC61937_DTSHD | subtype << 8;
192
193 /* If the bitrate is too high for transmitting at the selected
194 * repetition period setting, strip DTS-HD until a good amount
195 * of consecutive non-overflowing HD frames have been observed.
196 * This generally only happens if the caller is cramming a Master
197 * Audio stream into 192kHz IEC 60958 (which may or may not fit). */
198 if (sizeof(dtshd_start_code) + 2 + pkt_size
199 > ctx->pkt_offset - BURST_HEADER_SIZE && core_size) {
200 if (!ctx->dtshd_skip)
201 av_log(s, AV_LOG_WARNING, "DTS-HD bitrate too high, "
202 "temporarily sending core only\n");
203 if (ctx->dtshd_fallback > 0)
204 ctx->dtshd_skip = sample_rate * ctx->dtshd_fallback / (blocks << 5);
205 else
206 /* skip permanently (dtshd_fallback == -1) or just once
207 * (dtshd_fallback == 0) */
208 ctx->dtshd_skip = 1;
209 }
210 if (ctx->dtshd_skip && core_size) {
211 pkt_size = core_size;
212 if (ctx->dtshd_fallback >= 0)
213 --ctx->dtshd_skip;
214 }
215
216 ctx->out_bytes = sizeof(dtshd_start_code) + 2 + pkt_size;
217 ctx->length_code = ctx->out_bytes;
218
219 av_fast_malloc(&ctx->hd_buf, &ctx->hd_buf_size, ctx->out_bytes);
220 if (!ctx->hd_buf)
221 return AVERROR(ENOMEM);
222
223 ctx->out_buf = ctx->hd_buf;
224
225 memcpy(ctx->hd_buf, dtshd_start_code, sizeof(dtshd_start_code));
226 AV_WB16(ctx->hd_buf + sizeof(dtshd_start_code), pkt_size);
227 memcpy(ctx->hd_buf + sizeof(dtshd_start_code) + 2, pkt->data, pkt_size);
228
229 return 0;
230 }
231
232 static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt)
233 {
234 IEC61937Context *ctx = s->priv_data;
235 uint32_t syncword_dts = AV_RB32(pkt->data);
236 int blocks;
237 int sample_rate = 0;
238 int core_size = 0;
239
240 if (pkt->size < 9)
241 return AVERROR_INVALIDDATA;
242
243 switch (syncword_dts) {
244 case DCA_MARKER_RAW_BE:
245 blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f;
246 core_size = ((AV_RB24(pkt->data + 5) >> 4) & 0x3fff) + 1;
247 sample_rate = dca_sample_rates[(pkt->data[8] >> 2) & 0x0f];
248 break;
249 case DCA_MARKER_RAW_LE:
250 blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f;
251 ctx->extra_bswap = 1;
252 break;
253 case DCA_MARKER_14B_BE:
254 blocks =
255 (((pkt->data[5] & 0x07) << 4) | ((pkt->data[6] & 0x3f) >> 2));
256 break;
257 case DCA_MARKER_14B_LE:
258 blocks =
259 (((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2));
260 ctx->extra_bswap = 1;
261 break;
262 case DCA_HD_MARKER:
263 /* We only handle HD frames that are paired with core. However,
264 sometimes DTS-HD streams with core have a stray HD frame without
265 core in the beginning of the stream. */
266 av_log(s, AV_LOG_ERROR, "stray DTS-HD frame\n");
267 return AVERROR_INVALIDDATA;
268 default:
269 av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%x\n", syncword_dts);
270 return AVERROR_INVALIDDATA;
271 }
272 blocks++;
273
274 if (ctx->dtshd_rate)
275 /* DTS type IV output requested */
276 return spdif_header_dts4(s, pkt, core_size, sample_rate, blocks);
277
278 switch (blocks) {
279 case 512 >> 5: ctx->data_type = IEC61937_DTS1; break;
280 case 1024 >> 5: ctx->data_type = IEC61937_DTS2; break;
281 case 2048 >> 5: ctx->data_type = IEC61937_DTS3; break;
282 default:
283 av_log(s, AV_LOG_ERROR, "%i samples in DTS frame not supported\n",
284 blocks << 5);
285 return AVERROR(ENOSYS);
286 }
287
288 /* discard extraneous data by default */
289 if (core_size && core_size < pkt->size) {
290 ctx->out_bytes = core_size;
291 ctx->length_code = core_size << 3;
292 }
293
294 ctx->pkt_offset = blocks << 7;
295
296 if (ctx->out_bytes == ctx->pkt_offset) {
297 /* The DTS stream fits exactly into the output stream, so skip the
298 * preamble as it would not fit in there. This is the case for dts
299 * discs and dts-in-wav. */
300 ctx->use_preamble = 0;
301 } else if (ctx->out_bytes > ctx->pkt_offset - BURST_HEADER_SIZE) {
302 av_log_ask_for_sample(s, "Unrecognized large DTS frame.");
303 /* This will fail with a "bitrate too high" in the caller */
304 }
305
306 return 0;
307 }
308
309 static const enum IEC61937DataType mpeg_data_type[2][3] = {
310 // LAYER1 LAYER2 LAYER3
311 { IEC61937_MPEG2_LAYER1_LSF, IEC61937_MPEG2_LAYER2_LSF, IEC61937_MPEG2_LAYER3_LSF },//MPEG2 LSF
312 { IEC61937_MPEG1_LAYER1, IEC61937_MPEG1_LAYER23, IEC61937_MPEG1_LAYER23 }, //MPEG1
313 };
314
315 static int spdif_header_mpeg(AVFormatContext *s, AVPacket *pkt)
316 {
317 IEC61937Context *ctx = s->priv_data;
318 int version = (pkt->data[1] >> 3) & 3;
319 int layer = 3 - ((pkt->data[1] >> 1) & 3);
320 int extension = pkt->data[2] & 1;
321
322 if (layer == 3 || version == 1) {
323 av_log(s, AV_LOG_ERROR, "Wrong MPEG file format\n");
324 return AVERROR_INVALIDDATA;
325 }
326 av_log(s, AV_LOG_DEBUG, "version: %i layer: %i extension: %i\n", version, layer, extension);
327 if (version == 2 && extension) {
328 ctx->data_type = IEC61937_MPEG2_EXT;
329 ctx->pkt_offset = 4608;
330 } else {
331 ctx->data_type = mpeg_data_type [version & 1][layer];
332 ctx->pkt_offset = spdif_mpeg_pkt_offset[version & 1][layer];
333 }
334 // TODO Data type dependant info (normal/karaoke, dynamic range control)
335 return 0;
336 }
337
338 static int spdif_header_aac(AVFormatContext *s, AVPacket *pkt)
339 {
340 IEC61937Context *ctx = s->priv_data;
341 AACADTSHeaderInfo hdr;
342 GetBitContext gbc;
343 int ret;
344
345 init_get_bits(&gbc, pkt->data, AAC_ADTS_HEADER_SIZE * 8);
346 ret = ff_aac_parse_header(&gbc, &hdr);
347 if (ret < 0) {
348 av_log(s, AV_LOG_ERROR, "Wrong AAC file format\n");
349 return AVERROR_INVALIDDATA;
350 }
351
352 ctx->pkt_offset = hdr.samples << 2;
353 switch (hdr.num_aac_frames) {
354 case 1:
355 ctx->data_type = IEC61937_MPEG2_AAC;
356 break;
357 case 2:
358 ctx->data_type = IEC61937_MPEG2_AAC_LSF_2048;
359 break;
360 case 4:
361 ctx->data_type = IEC61937_MPEG2_AAC_LSF_4096;
362 break;
363 default:
364 av_log(s, AV_LOG_ERROR, "%i samples in AAC frame not supported\n",
365 hdr.samples);
366 return AVERROR(EINVAL);
367 }
368 //TODO Data type dependent info (LC profile/SBR)
369 return 0;
370 }
371
372
373 /*
374 * It seems Dolby TrueHD frames have to be encapsulated in MAT frames before
375 * they can be encapsulated in IEC 61937.
376 * Here we encapsulate 24 TrueHD frames in a single MAT frame, padding them
377 * to achieve constant rate.
378 * The actual format of a MAT frame is unknown, but the below seems to work.
379 * However, it seems it is not actually necessary for the 24 TrueHD frames to
380 * be in an exact alignment with the MAT frame.
381 */
382 #define MAT_FRAME_SIZE 61424
383 #define TRUEHD_FRAME_OFFSET 2560
384 #define MAT_MIDDLE_CODE_OFFSET -4
385
386 static int spdif_header_truehd(AVFormatContext *s, AVPacket *pkt)
387 {
388 IEC61937Context *ctx = s->priv_data;
389 int mat_code_length = 0;
390 const char mat_end_code[16] = { 0xC3, 0xC2, 0xC0, 0xC4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x11 };
391
392 if (!ctx->hd_buf_count) {
393 const char mat_start_code[20] = { 0x07, 0x9E, 0x00, 0x03, 0x84, 0x01, 0x01, 0x01, 0x80, 0x00, 0x56, 0xA5, 0x3B, 0xF4, 0x81, 0x83, 0x49, 0x80, 0x77, 0xE0 };
394 mat_code_length = sizeof(mat_start_code) + BURST_HEADER_SIZE;
395 memcpy(ctx->hd_buf, mat_start_code, sizeof(mat_start_code));
396
397 } else if (ctx->hd_buf_count == 12) {
398 const char mat_middle_code[12] = { 0xC3, 0xC1, 0x42, 0x49, 0x3B, 0xFA, 0x82, 0x83, 0x49, 0x80, 0x77, 0xE0 };
399 mat_code_length = sizeof(mat_middle_code) + MAT_MIDDLE_CODE_OFFSET;
400 memcpy(&ctx->hd_buf[12 * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + MAT_MIDDLE_CODE_OFFSET],
401 mat_middle_code, sizeof(mat_middle_code));
402 }
403
404 if (pkt->size > TRUEHD_FRAME_OFFSET - mat_code_length) {
405 /* if such frames exist, we'd need some more complex logic to
406 * distribute the TrueHD frames in the MAT frame */
407 av_log(s, AV_LOG_ERROR, "TrueHD frame too big, %d bytes\n", pkt->size);
408 av_log_ask_for_sample(s, NULL);
409 return AVERROR_INVALIDDATA;
410 }
411
412 memcpy(&ctx->hd_buf[ctx->hd_buf_count * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + mat_code_length],
413 pkt->data, pkt->size);
414 memset(&ctx->hd_buf[ctx->hd_buf_count * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + mat_code_length + pkt->size],
415 0, TRUEHD_FRAME_OFFSET - pkt->size - mat_code_length);
416
417 if (++ctx->hd_buf_count < 24){
418 ctx->pkt_offset = 0;
419 return 0;
420 }
421 memcpy(&ctx->hd_buf[MAT_FRAME_SIZE - sizeof(mat_end_code)], mat_end_code, sizeof(mat_end_code));
422 ctx->hd_buf_count = 0;
423
424 ctx->data_type = IEC61937_TRUEHD;
425 ctx->pkt_offset = 61440;
426 ctx->out_buf = ctx->hd_buf;
427 ctx->out_bytes = MAT_FRAME_SIZE;
428 ctx->length_code = MAT_FRAME_SIZE;
429 return 0;
430 }
431
432 static int spdif_write_header(AVFormatContext *s)
433 {
434 IEC61937Context *ctx = s->priv_data;
435
436 switch (s->streams[0]->codec->codec_id) {
437 case CODEC_ID_AC3:
438 ctx->header_info = spdif_header_ac3;
439 break;
440 case CODEC_ID_EAC3:
441 ctx->header_info = spdif_header_eac3;
442 break;
443 case CODEC_ID_MP1:
444 case CODEC_ID_MP2:
445 case CODEC_ID_MP3:
446 ctx->header_info = spdif_header_mpeg;
447 break;
448 case CODEC_ID_DTS:
449 ctx->header_info = spdif_header_dts;
450 break;
451 case CODEC_ID_AAC:
452 ctx->header_info = spdif_header_aac;
453 break;
454 case CODEC_ID_TRUEHD:
455 ctx->header_info = spdif_header_truehd;
456 ctx->hd_buf = av_malloc(MAT_FRAME_SIZE);
457 if (!ctx->hd_buf)
458 return AVERROR(ENOMEM);
459 break;
460 default:
461 av_log(s, AV_LOG_ERROR, "codec not supported\n");
462 return AVERROR_PATCHWELCOME;
463 }
464 return 0;
465 }
466
467 static int spdif_write_trailer(AVFormatContext *s)
468 {
469 IEC61937Context *ctx = s->priv_data;
470 av_freep(&ctx->buffer);
471 av_freep(&ctx->hd_buf);
472 return 0;
473 }
474
475 static av_always_inline void spdif_put_16(IEC61937Context *ctx,
476 ByteIOContext *pb, unsigned int val)
477 {
478 if (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)
479 put_be16(pb, val);
480 else
481 put_le16(pb, val);
482 }
483
484 static int spdif_write_packet(struct AVFormatContext *s, AVPacket *pkt)
485 {
486 IEC61937Context *ctx = s->priv_data;
487 int ret, padding;
488
489 ctx->out_buf = pkt->data;
490 ctx->out_bytes = pkt->size;
491 ctx->length_code = FFALIGN(pkt->size, 2) << 3;
492 ctx->use_preamble = 1;
493 ctx->extra_bswap = 0;
494
495 ret = ctx->header_info(s, pkt);
496 if (ret < 0)
497 return ret;
498 if (!ctx->pkt_offset)
499 return 0;
500
501 padding = (ctx->pkt_offset - ctx->use_preamble * BURST_HEADER_SIZE - ctx->out_bytes) & ~1;
502 if (padding < 0) {
503 av_log(s, AV_LOG_ERROR, "bitrate is too high\n");
504 return AVERROR(EINVAL);
505 }
506
507 if (ctx->use_preamble) {
508 spdif_put_16(ctx, s->pb, SYNCWORD1); //Pa
509 spdif_put_16(ctx, s->pb, SYNCWORD2); //Pb
510 spdif_put_16(ctx, s->pb, ctx->data_type); //Pc
511 spdif_put_16(ctx, s->pb, ctx->length_code);//Pd
512 }
513
514 if (ctx->extra_bswap ^ (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)) {
515 put_buffer(s->pb, ctx->out_buf, ctx->out_bytes & ~1);
516 } else {
517 av_fast_malloc(&ctx->buffer, &ctx->buffer_size, ctx->out_bytes + FF_INPUT_BUFFER_PADDING_SIZE);
518 if (!ctx->buffer)
519 return AVERROR(ENOMEM);
520 ff_spdif_bswap_buf16((uint16_t *)ctx->buffer, (uint16_t *)ctx->out_buf, ctx->out_bytes >> 1);
521 put_buffer(s->pb, ctx->buffer, ctx->out_bytes & ~1);
522 }
523
524 /* a final lone byte has to be MSB aligned */
525 if (ctx->out_bytes & 1)
526 spdif_put_16(ctx, s->pb, ctx->out_buf[ctx->out_bytes - 1] << 8);
527
528 put_nbyte(s->pb, 0, padding);
529
530 av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n",
531 ctx->data_type, ctx->out_bytes, ctx->pkt_offset);
532
533 put_flush_packet(s->pb);
534 return 0;
535 }
536
537 AVOutputFormat ff_spdif_muxer = {
538 "spdif",
539 NULL_IF_CONFIG_SMALL("IEC 61937 (used on S/PDIF - IEC958)"),
540 NULL,
541 "spdif",
542 sizeof(IEC61937Context),
543 CODEC_ID_AC3,
544 CODEC_ID_NONE,
545 spdif_write_header,
546 spdif_write_packet,
547 spdif_write_trailer,
548 .flags = AVFMT_NOTIMESTAMPS,
549 .priv_class = &class,
550 };