added DVD LPCM decoding support
[libav.git] / libavformat / mpeg.c
1 /*
2 * MPEG1/2 mux/demux
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19 #include "avformat.h"
20
21 #define MAX_PAYLOAD_SIZE 4096
22 #define NB_STREAMS 2
23
24 typedef struct {
25 UINT8 buffer[MAX_PAYLOAD_SIZE];
26 int buffer_ptr;
27 UINT8 id;
28 int max_buffer_size; /* in bytes */
29 int packet_number;
30 INT64 start_pts;
31 } StreamInfo;
32
33 typedef struct {
34 int packet_size; /* required packet size */
35 int packet_data_max_size; /* maximum data size inside a packet */
36 int packet_number;
37 int pack_header_freq; /* frequency (in packets^-1) at which we send pack headers */
38 int system_header_freq;
39 int mux_rate; /* bitrate in units of 50 bytes/s */
40 /* stream info */
41 int audio_bound;
42 int video_bound;
43 int is_mpeg2;
44 int is_vcd;
45 } MpegMuxContext;
46
47 #define PACK_START_CODE ((unsigned int)0x000001ba)
48 #define SYSTEM_HEADER_START_CODE ((unsigned int)0x000001bb)
49 #define SEQUENCE_END_CODE ((unsigned int)0x000001b7)
50 #define PACKET_START_CODE_MASK ((unsigned int)0xffffff00)
51 #define PACKET_START_CODE_PREFIX ((unsigned int)0x00000100)
52 #define ISO_11172_END_CODE ((unsigned int)0x000001b9)
53
54 /* mpeg2 */
55 #define PROGRAM_STREAM_MAP 0x1bc
56 #define PRIVATE_STREAM_1 0x1bd
57 #define PADDING_STREAM 0x1be
58 #define PRIVATE_STREAM_2 0x1bf
59
60
61 #define AUDIO_ID 0xc0
62 #define VIDEO_ID 0xe0
63
64 extern AVOutputFormat mpeg1system_mux;
65 extern AVOutputFormat mpeg1vcd_mux;
66 extern AVOutputFormat mpeg2vob_mux;
67
68 static int put_pack_header(AVFormatContext *ctx,
69 UINT8 *buf, INT64 timestamp)
70 {
71 MpegMuxContext *s = ctx->priv_data;
72 PutBitContext pb;
73
74 init_put_bits(&pb, buf, 128, NULL, NULL);
75
76 put_bits(&pb, 32, PACK_START_CODE);
77 if (s->is_mpeg2) {
78 put_bits(&pb, 2, 0x2);
79 } else {
80 put_bits(&pb, 4, 0x2);
81 }
82 put_bits(&pb, 3, (UINT32)((timestamp >> 30) & 0x07));
83 put_bits(&pb, 1, 1);
84 put_bits(&pb, 15, (UINT32)((timestamp >> 15) & 0x7fff));
85 put_bits(&pb, 1, 1);
86 put_bits(&pb, 15, (UINT32)((timestamp) & 0x7fff));
87 put_bits(&pb, 1, 1);
88 if (s->is_mpeg2) {
89 /* clock extension */
90 put_bits(&pb, 9, 0);
91 put_bits(&pb, 1, 1);
92 }
93 put_bits(&pb, 1, 1);
94 put_bits(&pb, 22, s->mux_rate);
95 put_bits(&pb, 1, 1);
96 if (s->is_mpeg2) {
97 put_bits(&pb, 5, 0x1f); /* reserved */
98 put_bits(&pb, 3, 0); /* stuffing length */
99 }
100 flush_put_bits(&pb);
101 return pbBufPtr(&pb) - pb.buf;
102 }
103
104 static int put_system_header(AVFormatContext *ctx, UINT8 *buf)
105 {
106 MpegMuxContext *s = ctx->priv_data;
107 int size, rate_bound, i, private_stream_coded, id;
108 PutBitContext pb;
109
110 init_put_bits(&pb, buf, 128, NULL, NULL);
111
112 put_bits(&pb, 32, SYSTEM_HEADER_START_CODE);
113 put_bits(&pb, 16, 0);
114 put_bits(&pb, 1, 1);
115
116 rate_bound = s->mux_rate; /* maximum bit rate of the multiplexed stream */
117 put_bits(&pb, 22, rate_bound);
118 put_bits(&pb, 1, 1); /* marker */
119 put_bits(&pb, 6, s->audio_bound);
120
121 put_bits(&pb, 1, 1); /* variable bitrate */
122 put_bits(&pb, 1, 1); /* non constrainted bit stream */
123
124 put_bits(&pb, 1, 0); /* audio locked */
125 put_bits(&pb, 1, 0); /* video locked */
126 put_bits(&pb, 1, 1); /* marker */
127
128 put_bits(&pb, 5, s->video_bound);
129 put_bits(&pb, 8, 0xff); /* reserved byte */
130
131 /* audio stream info */
132 private_stream_coded = 0;
133 for(i=0;i<ctx->nb_streams;i++) {
134 StreamInfo *stream = ctx->streams[i]->priv_data;
135 id = stream->id;
136 if (id < 0xc0) {
137 /* special case for private streams (AC3 use that) */
138 if (private_stream_coded)
139 continue;
140 private_stream_coded = 1;
141 id = 0xbd;
142 }
143 put_bits(&pb, 8, id); /* stream ID */
144 put_bits(&pb, 2, 3);
145 if (id < 0xe0) {
146 /* audio */
147 put_bits(&pb, 1, 0);
148 put_bits(&pb, 13, stream->max_buffer_size / 128);
149 } else {
150 /* video */
151 put_bits(&pb, 1, 1);
152 put_bits(&pb, 13, stream->max_buffer_size / 1024);
153 }
154 }
155 flush_put_bits(&pb);
156 size = pbBufPtr(&pb) - pb.buf;
157 /* patch packet size */
158 buf[4] = (size - 6) >> 8;
159 buf[5] = (size - 6) & 0xff;
160
161 return size;
162 }
163
164 static int mpeg_mux_init(AVFormatContext *ctx)
165 {
166 MpegMuxContext *s = ctx->priv_data;
167 int bitrate, i, mpa_id, mpv_id, ac3_id;
168 AVStream *st;
169 StreamInfo *stream;
170
171 s->packet_number = 0;
172 s->is_vcd = (ctx->oformat == &mpeg1vcd_mux);
173 s->is_mpeg2 = (ctx->oformat == &mpeg2vob_mux);
174
175 if (s->is_vcd)
176 s->packet_size = 2324; /* VCD packet size */
177 else
178 s->packet_size = 2048;
179
180 /* startcode(4) + length(2) + flags(1) */
181 s->packet_data_max_size = s->packet_size - 7;
182 s->audio_bound = 0;
183 s->video_bound = 0;
184 mpa_id = AUDIO_ID;
185 ac3_id = 0x80;
186 mpv_id = VIDEO_ID;
187 for(i=0;i<ctx->nb_streams;i++) {
188 st = ctx->streams[i];
189 stream = av_mallocz(sizeof(StreamInfo));
190 if (!stream)
191 goto fail;
192 st->priv_data = stream;
193
194 switch(st->codec.codec_type) {
195 case CODEC_TYPE_AUDIO:
196 if (st->codec.codec_id == CODEC_ID_AC3)
197 stream->id = ac3_id++;
198 else
199 stream->id = mpa_id++;
200 stream->max_buffer_size = 4 * 1024;
201 s->audio_bound++;
202 break;
203 case CODEC_TYPE_VIDEO:
204 stream->id = mpv_id++;
205 stream->max_buffer_size = 46 * 1024;
206 s->video_bound++;
207 break;
208 default:
209 av_abort();
210 }
211 }
212
213 /* we increase slightly the bitrate to take into account the
214 headers. XXX: compute it exactly */
215 bitrate = 2000;
216 for(i=0;i<ctx->nb_streams;i++) {
217 st = ctx->streams[i];
218 bitrate += st->codec.bit_rate;
219 }
220 s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
221
222 if (s->is_vcd || s->is_mpeg2)
223 /* every packet */
224 s->pack_header_freq = 1;
225 else
226 /* every 2 seconds */
227 s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
228
229 if (s->is_mpeg2)
230 /* every 200 packets. Need to look at the spec. */
231 s->system_header_freq = s->pack_header_freq * 40;
232 else if (s->is_vcd)
233 /* every 40 packets, this is my invention */
234 s->system_header_freq = s->pack_header_freq * 40;
235 else
236 s->system_header_freq = s->pack_header_freq * 5;
237
238 for(i=0;i<ctx->nb_streams;i++) {
239 stream = ctx->streams[i]->priv_data;
240 stream->buffer_ptr = 0;
241 stream->packet_number = 0;
242 stream->start_pts = -1;
243 }
244 return 0;
245 fail:
246 for(i=0;i<ctx->nb_streams;i++) {
247 av_free(ctx->streams[i]->priv_data);
248 }
249 return -ENOMEM;
250 }
251
252 /* flush the packet on stream stream_index */
253 static void flush_packet(AVFormatContext *ctx, int stream_index, int last_pkt)
254 {
255 MpegMuxContext *s = ctx->priv_data;
256 StreamInfo *stream = ctx->streams[stream_index]->priv_data;
257 UINT8 *buf_ptr;
258 int size, payload_size, startcode, id, len, stuffing_size, i, header_len;
259 INT64 timestamp;
260 UINT8 buffer[128];
261 int last = last_pkt ? 4 : 0;
262
263 id = stream->id;
264 timestamp = stream->start_pts;
265
266 #if 0
267 printf("packet ID=%2x PTS=%0.3f\n",
268 id, timestamp / 90000.0);
269 #endif
270
271 buf_ptr = buffer;
272 if (((s->packet_number % s->pack_header_freq) == 0)) {
273 /* output pack and systems header if needed */
274 size = put_pack_header(ctx, buf_ptr, timestamp);
275 buf_ptr += size;
276 if ((s->packet_number % s->system_header_freq) == 0) {
277 size = put_system_header(ctx, buf_ptr);
278 buf_ptr += size;
279 }
280 }
281 size = buf_ptr - buffer;
282 put_buffer(&ctx->pb, buffer, size);
283
284 /* packet header */
285 if (s->is_mpeg2) {
286 header_len = 8;
287 } else {
288 header_len = 5;
289 }
290 payload_size = s->packet_size - (size + 6 + header_len + last);
291 if (id < 0xc0) {
292 startcode = PRIVATE_STREAM_1;
293 payload_size -= 4;
294 } else {
295 startcode = 0x100 + id;
296 }
297 stuffing_size = payload_size - stream->buffer_ptr;
298 if (stuffing_size < 0)
299 stuffing_size = 0;
300
301 put_be32(&ctx->pb, startcode);
302
303 put_be16(&ctx->pb, payload_size + header_len);
304 /* stuffing */
305 for(i=0;i<stuffing_size;i++)
306 put_byte(&ctx->pb, 0xff);
307
308 if (s->is_mpeg2) {
309 put_byte(&ctx->pb, 0x80); /* mpeg2 id */
310 put_byte(&ctx->pb, 0x80); /* flags */
311 put_byte(&ctx->pb, 0x05); /* header len (only pts is included) */
312 }
313 put_byte(&ctx->pb,
314 (0x02 << 4) |
315 (((timestamp >> 30) & 0x07) << 1) |
316 1);
317 put_be16(&ctx->pb, (UINT16)((((timestamp >> 15) & 0x7fff) << 1) | 1));
318 put_be16(&ctx->pb, (UINT16)((((timestamp) & 0x7fff) << 1) | 1));
319
320 if (startcode == PRIVATE_STREAM_1) {
321 put_byte(&ctx->pb, id);
322 if (id >= 0x80 && id <= 0xbf) {
323 /* XXX: need to check AC3 spec */
324 put_byte(&ctx->pb, 1);
325 put_byte(&ctx->pb, 0);
326 put_byte(&ctx->pb, 2);
327 }
328 }
329
330 if (last_pkt) {
331 put_be32(&ctx->pb, ISO_11172_END_CODE);
332 }
333 /* output data */
334 put_buffer(&ctx->pb, stream->buffer, payload_size - stuffing_size);
335 put_flush_packet(&ctx->pb);
336
337 /* preserve remaining data */
338 len = stream->buffer_ptr - payload_size;
339 if (len < 0)
340 len = 0;
341 memmove(stream->buffer, stream->buffer + stream->buffer_ptr - len, len);
342 stream->buffer_ptr = len;
343
344 s->packet_number++;
345 stream->packet_number++;
346 stream->start_pts = -1;
347 }
348
349 static int mpeg_mux_write_packet(AVFormatContext *ctx, int stream_index,
350 UINT8 *buf, int size, int pts)
351 {
352 MpegMuxContext *s = ctx->priv_data;
353 AVStream *st = ctx->streams[stream_index];
354 StreamInfo *stream = st->priv_data;
355 int len;
356
357 while (size > 0) {
358 /* set pts */
359 if (stream->start_pts == -1) {
360 stream->start_pts = pts;
361 }
362 len = s->packet_data_max_size - stream->buffer_ptr;
363 if (len > size)
364 len = size;
365 memcpy(stream->buffer + stream->buffer_ptr, buf, len);
366 stream->buffer_ptr += len;
367 buf += len;
368 size -= len;
369 while (stream->buffer_ptr >= s->packet_data_max_size) {
370 /* output the packet */
371 if (stream->start_pts == -1)
372 stream->start_pts = pts;
373 flush_packet(ctx, stream_index, 0);
374 }
375 }
376 return 0;
377 }
378
379 static int mpeg_mux_end(AVFormatContext *ctx)
380 {
381 StreamInfo *stream;
382 int i;
383
384 /* flush each packet */
385 for(i=0;i<ctx->nb_streams;i++) {
386 stream = ctx->streams[i]->priv_data;
387 if (stream->buffer_ptr > 0) {
388 if (i == (ctx->nb_streams - 1))
389 flush_packet(ctx, i, 1);
390 else
391 flush_packet(ctx, i, 0);
392 }
393 }
394
395 /* write the end header */
396 //put_be32(&ctx->pb, ISO_11172_END_CODE);
397 //put_flush_packet(&ctx->pb);
398 return 0;
399 }
400
401 /*********************************************/
402 /* demux code */
403
404 #define MAX_SYNC_SIZE 100000
405
406 static int mpegps_probe(AVProbeData *p)
407 {
408 int code, c, i;
409 code = 0xff;
410
411 /* we search the first start code. If it is a packet start code,
412 then we decide it is mpeg ps. We do not send highest value to
413 give a chance to mpegts */
414 for(i=0;i<p->buf_size;i++) {
415 c = p->buf[i];
416 code = (code << 8) | c;
417 if ((code & 0xffffff00) == 0x100) {
418 if (code == PACK_START_CODE ||
419 code == SYSTEM_HEADER_START_CODE ||
420 (code >= 0x1e0 && code <= 0x1ef) ||
421 (code >= 0x1c0 && code <= 0x1df) ||
422 code == PRIVATE_STREAM_2 ||
423 code == PROGRAM_STREAM_MAP ||
424 code == PRIVATE_STREAM_1 ||
425 code == PADDING_STREAM)
426 return AVPROBE_SCORE_MAX - 1;
427 else
428 return 0;
429 }
430 }
431 return 0;
432 }
433
434
435 typedef struct MpegDemuxContext {
436 int header_state;
437 } MpegDemuxContext;
438
439 static int find_start_code(ByteIOContext *pb, int *size_ptr,
440 UINT32 *header_state)
441 {
442 unsigned int state, v;
443 int val, n;
444
445 state = *header_state;
446 n = *size_ptr;
447 while (n > 0) {
448 if (url_feof(pb))
449 break;
450 v = get_byte(pb);
451 n--;
452 if (state == 0x000001) {
453 state = ((state << 8) | v) & 0xffffff;
454 val = state;
455 goto found;
456 }
457 state = ((state << 8) | v) & 0xffffff;
458 }
459 val = -1;
460 found:
461 *header_state = state;
462 *size_ptr = n;
463 return val;
464 }
465
466 static int mpegps_read_header(AVFormatContext *s,
467 AVFormatParameters *ap)
468 {
469 MpegDemuxContext *m = s->priv_data;
470 m->header_state = 0xff;
471 /* no need to do more */
472 return 0;
473 }
474
475 static INT64 get_pts(ByteIOContext *pb, int c)
476 {
477 INT64 pts;
478 int val;
479
480 if (c < 0)
481 c = get_byte(pb);
482 pts = (INT64)((c >> 1) & 0x07) << 30;
483 val = get_be16(pb);
484 pts |= (INT64)(val >> 1) << 15;
485 val = get_be16(pb);
486 pts |= (INT64)(val >> 1);
487 return pts;
488 }
489
490 static int mpegps_read_packet(AVFormatContext *s,
491 AVPacket *pkt)
492 {
493 MpegDemuxContext *m = s->priv_data;
494 AVStream *st;
495 int len, size, startcode, i, c, flags, header_len, type, codec_id;
496 INT64 pts, dts;
497
498 /* next start code (should be immediately after) */
499 redo:
500 m->header_state = 0xff;
501 size = MAX_SYNC_SIZE;
502 startcode = find_start_code(&s->pb, &size, &m->header_state);
503 //printf("startcode=%x pos=0x%Lx\n", startcode, url_ftell(&s->pb));
504 if (startcode < 0)
505 return -EIO;
506 if (startcode == PACK_START_CODE)
507 goto redo;
508 if (startcode == SYSTEM_HEADER_START_CODE)
509 goto redo;
510 if (startcode == PADDING_STREAM ||
511 startcode == PRIVATE_STREAM_2) {
512 /* skip them */
513 len = get_be16(&s->pb);
514 url_fskip(&s->pb, len);
515 goto redo;
516 }
517 /* find matching stream */
518 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
519 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
520 (startcode == 0x1bd)))
521 goto redo;
522
523 len = get_be16(&s->pb);
524 pts = AV_NOPTS_VALUE;
525 dts = AV_NOPTS_VALUE;
526 /* stuffing */
527 for(;;) {
528 c = get_byte(&s->pb);
529 len--;
530 /* XXX: for mpeg1, should test only bit 7 */
531 if (c != 0xff)
532 break;
533 }
534 if ((c & 0xc0) == 0x40) {
535 /* buffer scale & size */
536 get_byte(&s->pb);
537 c = get_byte(&s->pb);
538 len -= 2;
539 }
540 if ((c & 0xf0) == 0x20) {
541 pts = get_pts(&s->pb, c);
542 len -= 4;
543 } else if ((c & 0xf0) == 0x30) {
544 pts = get_pts(&s->pb, c);
545 dts = get_pts(&s->pb, -1);
546 len -= 9;
547 } else if ((c & 0xc0) == 0x80) {
548 /* mpeg 2 PES */
549 if ((c & 0x30) != 0) {
550 fprintf(stderr, "Encrypted multiplex not handled\n");
551 return -EIO;
552 }
553 flags = get_byte(&s->pb);
554 header_len = get_byte(&s->pb);
555 len -= 2;
556 if (header_len > len)
557 goto redo;
558 if ((flags & 0xc0) == 0x80) {
559 pts = get_pts(&s->pb, -1);
560 header_len -= 5;
561 len -= 5;
562 } if ((flags & 0xc0) == 0xc0) {
563 pts = get_pts(&s->pb, -1);
564 dts = get_pts(&s->pb, -1);
565 header_len -= 10;
566 len -= 10;
567 }
568 len -= header_len;
569 while (header_len > 0) {
570 get_byte(&s->pb);
571 header_len--;
572 }
573 }
574 if (startcode == 0x1bd) {
575 startcode = get_byte(&s->pb);
576 len--;
577 if (startcode >= 0x80 && startcode <= 0xbf) {
578 /* audio: skip header */
579 get_byte(&s->pb);
580 get_byte(&s->pb);
581 get_byte(&s->pb);
582 len -= 3;
583 }
584 }
585
586 /* now find stream */
587 for(i=0;i<s->nb_streams;i++) {
588 st = s->streams[i];
589 if (st->id == startcode)
590 goto found;
591 }
592 if (startcode >= 0x1e0 && startcode <= 0x1ef) {
593 type = CODEC_TYPE_VIDEO;
594 codec_id = CODEC_ID_MPEG1VIDEO;
595 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
596 type = CODEC_TYPE_AUDIO;
597 codec_id = CODEC_ID_MP2;
598 } else if (startcode >= 0x80 && startcode <= 0x9f) {
599 type = CODEC_TYPE_AUDIO;
600 codec_id = CODEC_ID_AC3;
601 } else if (startcode >= 0xa0 && startcode <= 0xbf) {
602 type = CODEC_TYPE_AUDIO;
603 codec_id = CODEC_ID_PCM_S16BE;
604 } else {
605 skip:
606 /* skip packet */
607 url_fskip(&s->pb, len);
608 goto redo;
609 }
610 /* no stream found: add a new stream */
611 st = av_new_stream(s, startcode);
612 if (!st)
613 goto skip;
614 st->codec.codec_type = type;
615 st->codec.codec_id = codec_id;
616 found:
617 if (startcode >= 0xa0 && startcode <= 0xbf) {
618 int b1, freq;
619 static const int lpcm_freq_tab[4] = { 48000, 96000, 44100, 32000 };
620
621 /* for LPCM, we just skip the header and consider it is raw
622 audio data */
623 if (len <= 3)
624 goto skip;
625 get_byte(&s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
626 b1 = get_byte(&s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
627 get_byte(&s->pb); /* dynamic range control (0x80 = off) */
628 len -= 3;
629 freq = (b1 >> 4) & 3;
630 st->codec.sample_rate = lpcm_freq_tab[freq];
631 st->codec.channels = 1 + (b1 & 7);
632 st->codec.bit_rate = st->codec.channels * st->codec.sample_rate * 2;
633 }
634 av_new_packet(pkt, len);
635 //printf("\nRead Packet ID: %x PTS: %f Size: %d", startcode,
636 // (float)pts/90000, len);
637 get_buffer(&s->pb, pkt->data, pkt->size);
638 pkt->pts = pts;
639 pkt->stream_index = st->index;
640 return 0;
641 }
642
643 static int mpegps_read_close(AVFormatContext *s)
644 {
645 return 0;
646 }
647
648 static AVOutputFormat mpeg1system_mux = {
649 "mpeg",
650 "MPEG1 System format",
651 "video/mpeg",
652 "mpg,mpeg",
653 sizeof(MpegMuxContext),
654 CODEC_ID_MP2,
655 CODEC_ID_MPEG1VIDEO,
656 mpeg_mux_init,
657 mpeg_mux_write_packet,
658 mpeg_mux_end,
659 };
660
661 static AVOutputFormat mpeg1vcd_mux = {
662 "vcd",
663 "MPEG1 System format (VCD)",
664 "video/mpeg",
665 NULL,
666 sizeof(MpegMuxContext),
667 CODEC_ID_MP2,
668 CODEC_ID_MPEG1VIDEO,
669 mpeg_mux_init,
670 mpeg_mux_write_packet,
671 mpeg_mux_end,
672 };
673
674 static AVOutputFormat mpeg2vob_mux = {
675 "vob",
676 "MPEG2 PS format (VOB)",
677 "video/mpeg",
678 "vob",
679 sizeof(MpegMuxContext),
680 CODEC_ID_MP2,
681 CODEC_ID_MPEG1VIDEO,
682 mpeg_mux_init,
683 mpeg_mux_write_packet,
684 mpeg_mux_end,
685 };
686
687 static AVInputFormat mpegps_demux = {
688 "mpeg",
689 "MPEG PS format",
690 sizeof(MpegDemuxContext),
691 mpegps_probe,
692 mpegps_read_header,
693 mpegps_read_packet,
694 mpegps_read_close,
695 .flags = AVFMT_NOHEADER,
696 };
697
698 int mpegps_init(void)
699 {
700 av_register_output_format(&mpeg1system_mux);
701 av_register_output_format(&mpeg1vcd_mux);
702 av_register_output_format(&mpeg2vob_mux);
703 av_register_input_format(&mpegps_demux);
704 return 0;
705 }