3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 /*********************************************/
32 #define MAX_SYNC_SIZE 100000
34 static int check_pes(uint8_t *p, uint8_t *end){
36 int pes2= (p[3] & 0xC0) == 0x80
37 && (p[4] & 0xC0) != 0x40
38 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
40 for(p+=3; p<end && *p == 0xFF; p++);
41 if((*p&0xC0) == 0x40) p+=2;
42 if((*p&0xF0) == 0x20){
43 pes1= p[0]&p[2]&p[4]&1;
44 }else if((*p&0xF0) == 0x30){
45 pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
52 static int mpegps_probe(AVProbeData *p)
55 int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
59 for(i=0; i<p->buf_size; i++){
60 code = (code<<8) + p->buf[i];
61 if ((code & 0xffffff00) == 0x100) {
62 int len= p->buf[i+1] << 8 | p->buf[i+2];
63 int pes= check_pes(p->buf+i, p->buf+p->buf_size);
65 if(code == SYSTEM_HEADER_START_CODE) sys++;
66 else if(code == PACK_START_CODE) pspack++;
67 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
68 // skip pes payload to avoid start code emulation for private
70 else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
71 else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
73 else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
74 else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
75 else if(code == PRIVATE_STREAM_1 && !pes) invalid++;
79 if(vid+audio > invalid) /* invalid VDR files nd short PES streams */
80 score= AVPROBE_SCORE_MAX/4;
82 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, invalid, p->buf_size);
83 if(sys>invalid && sys*9 <= pspack*10)
84 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
85 if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
86 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
87 if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
88 return (audio > 12 || vid > 3) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
90 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
91 //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
96 typedef struct MpegDemuxContext {
98 unsigned char psm_es_type[256];
102 static int mpegps_read_header(AVFormatContext *s,
103 AVFormatParameters *ap)
105 MpegDemuxContext *m = s->priv_data;
106 const char *sofdec = "Sofdec";
109 m->header_state = 0xff;
110 s->ctx_flags |= AVFMTCTX_NOHEADER;
115 m->header_state = m->header_state << 8 | v;
117 } while (v == sofdec[i] && i++ < 6);
119 m->sofdec = (m->sofdec == 6) ? 1 : 0;
121 /* no need to do more */
125 static int64_t get_pts(AVIOContext *pb, int c)
129 buf[0] = c<0 ? avio_r8(pb) : c;
130 avio_read(pb, buf+1, 4);
132 return ff_parse_pes_pts(buf);
135 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
136 int32_t *header_state)
138 unsigned int state, v;
141 state = *header_state;
148 if (state == 0x000001) {
149 state = ((state << 8) | v) & 0xffffff;
153 state = ((state << 8) | v) & 0xffffff;
157 *header_state = state;
162 #if 0 /* unused, remove? */
164 static int find_prev_start_code(AVIOContext *pb, int *size_ptr)
166 int64_t pos, pos_start;
167 int max_size, start_code;
169 max_size = *size_ptr;
170 pos_start = avio_tell(pb);
172 /* in order to go faster, we fill the buffer */
173 pos = pos_start - 16386;
176 avio_seek(pb, pos, SEEK_SET);
182 if (pos < 0 || (pos_start - pos) >= max_size) {
186 avio_seek(pb, pos, SEEK_SET);
187 start_code = avio_rb32(pb);
188 if ((start_code & 0xffffff00) == 0x100)
192 *size_ptr = pos_start - pos;
198 * Extract stream types from a program stream map
199 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
201 * @return number of bytes occupied by PSM in the bitstream
203 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
205 int psm_length, ps_info_length, es_map_length;
207 psm_length = avio_rb16(pb);
210 ps_info_length = avio_rb16(pb);
212 /* skip program_stream_info */
213 avio_skip(pb, ps_info_length);
214 es_map_length = avio_rb16(pb);
216 /* at least one es available? */
217 while (es_map_length >= 4){
218 unsigned char type = avio_r8(pb);
219 unsigned char es_id = avio_r8(pb);
220 uint16_t es_info_length = avio_rb16(pb);
221 /* remember mapping from stream id to stream type */
222 m->psm_es_type[es_id] = type;
223 /* skip program_stream_info */
224 avio_skip(pb, es_info_length);
225 es_map_length -= 4 + es_info_length;
227 avio_rb32(pb); /* crc32 */
228 return 2 + psm_length;
231 /* read the next PES header. Return its position in ppos
232 (if not NULL), and its start code, pts and dts.
234 static int mpegps_read_pes_header(AVFormatContext *s,
235 int64_t *ppos, int *pstart_code,
236 int64_t *ppts, int64_t *pdts)
238 MpegDemuxContext *m = s->priv_data;
239 int len, size, startcode, c, flags, header_len;
240 int pes_ext, ext2_len, id_ext, skip;
242 int64_t last_sync= avio_tell(s->pb);
245 avio_seek(s->pb, last_sync, SEEK_SET);
247 /* next start code (should be immediately after) */
248 m->header_state = 0xff;
249 size = MAX_SYNC_SIZE;
250 startcode = find_next_start_code(s->pb, &size, &m->header_state);
251 last_sync = avio_tell(s->pb);
252 //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, avio_tell(s->pb));
254 if(s->pb->eof_reached)
256 //FIXME we should remember header_state
257 return AVERROR(EAGAIN);
260 if (startcode == PACK_START_CODE)
262 if (startcode == SYSTEM_HEADER_START_CODE)
264 if (startcode == PADDING_STREAM) {
265 avio_skip(s->pb, avio_rb16(s->pb));
268 if (startcode == PRIVATE_STREAM_2) {
269 len = avio_rb16(s->pb);
272 if (avio_r8(s->pb) == 'S') {
274 avio_read(s->pb, buf, sizeof(buf));
275 m->sofdec = !memcmp(buf, "ofdec", 5);
280 m->sofdec -= !m->sofdec;
282 avio_skip(s->pb, len);
285 if (startcode == PROGRAM_STREAM_MAP) {
286 mpegps_psm_parse(m, s->pb);
290 /* find matching stream */
291 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
292 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
293 (startcode == 0x1bd) || (startcode == 0x1fd)))
296 *ppos = avio_tell(s->pb) - 4;
298 len = avio_rb16(s->pb);
300 dts = AV_NOPTS_VALUE;
307 /* XXX: for mpeg1, should test only bit 7 */
311 if ((c & 0xc0) == 0x40) {
312 /* buffer scale & size */
317 if ((c & 0xe0) == 0x20) {
318 dts = pts = get_pts(s->pb, c);
321 dts = get_pts(s->pb, -1);
324 } else if ((c & 0xc0) == 0x80) {
326 #if 0 /* some streams have this field set for no apparent reason */
327 if ((c & 0x30) != 0) {
328 /* Encrypted multiplex not handled */
332 flags = avio_r8(s->pb);
333 header_len = avio_r8(s->pb);
335 if (header_len > len)
339 dts = pts = get_pts(s->pb, -1);
342 dts = get_pts(s->pb, -1);
346 if (flags & 0x3f && header_len == 0){
348 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
350 if (flags & 0x01) { /* PES extension */
351 pes_ext = avio_r8(s->pb);
353 /* Skip PES private data, program packet sequence counter and P-STD buffer */
354 skip = (pes_ext >> 4) & 0xb;
356 if (pes_ext & 0x40 || skip > header_len){
357 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
360 avio_skip(s->pb, skip);
363 if (pes_ext & 0x01) { /* PES extension 2 */
364 ext2_len = avio_r8(s->pb);
366 if ((ext2_len & 0x7f) > 0) {
367 id_ext = avio_r8(s->pb);
368 if ((id_ext & 0x80) == 0)
369 startcode = ((startcode & 0xff) << 8) | id_ext;
376 avio_skip(s->pb, header_len);
381 if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
382 startcode = avio_r8(s->pb);
384 if (startcode >= 0x80 && startcode <= 0xcf) {
385 /* audio: skip header */
390 if (startcode >= 0xb0 && startcode <= 0xbf) {
391 /* MLP/TrueHD audio has a 4-byte header */
399 if(dts != AV_NOPTS_VALUE && ppos){
401 for(i=0; i<s->nb_streams; i++){
402 if(startcode == s->streams[i]->id &&
403 s->pb->seekable /* index useless on streams anyway */) {
404 ff_reduce_index(s, i);
405 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
410 *pstart_code = startcode;
416 static int mpegps_read_packet(AVFormatContext *s,
419 MpegDemuxContext *m = s->priv_data;
421 int len, startcode, i, es_type;
422 enum CodecID codec_id = CODEC_ID_NONE;
423 enum AVMediaType type;
424 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
425 uint8_t av_uninit(dvdaudio_substream_type);
428 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
432 if(startcode == 0x1bd) {
433 dvdaudio_substream_type = avio_r8(s->pb);
438 /* now find stream */
439 for(i=0;i<s->nb_streams;i++) {
441 if (st->id == startcode)
445 es_type = m->psm_es_type[startcode & 0xff];
446 if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
447 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
448 codec_id = CODEC_ID_MPEG2VIDEO;
449 type = AVMEDIA_TYPE_VIDEO;
450 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
451 codec_id = CODEC_ID_MPEG2VIDEO;
452 type = AVMEDIA_TYPE_VIDEO;
453 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
454 es_type == STREAM_TYPE_AUDIO_MPEG2){
455 codec_id = CODEC_ID_MP3;
456 type = AVMEDIA_TYPE_AUDIO;
457 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
458 codec_id = CODEC_ID_AAC;
459 type = AVMEDIA_TYPE_AUDIO;
460 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
461 codec_id = CODEC_ID_MPEG4;
462 type = AVMEDIA_TYPE_VIDEO;
463 } else if(es_type == STREAM_TYPE_VIDEO_H264){
464 codec_id = CODEC_ID_H264;
465 type = AVMEDIA_TYPE_VIDEO;
466 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
467 codec_id = CODEC_ID_AC3;
468 type = AVMEDIA_TYPE_AUDIO;
472 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
473 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
474 unsigned char buf[8];
475 avio_read(s->pb, buf, 8);
476 avio_seek(s->pb, -8, SEEK_CUR);
477 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
478 codec_id = CODEC_ID_CAVS;
480 codec_id = CODEC_ID_PROBE;
481 type = AVMEDIA_TYPE_VIDEO;
482 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
483 type = AVMEDIA_TYPE_AUDIO;
484 codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
485 } else if (startcode >= 0x80 && startcode <= 0x87) {
486 type = AVMEDIA_TYPE_AUDIO;
487 codec_id = CODEC_ID_AC3;
488 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
489 ||( startcode >= 0x98 && startcode <= 0x9f)) {
490 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
491 type = AVMEDIA_TYPE_AUDIO;
492 codec_id = CODEC_ID_DTS;
493 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
494 type = AVMEDIA_TYPE_AUDIO;
495 /* 16 bit form will be handled as CODEC_ID_PCM_S16BE */
496 codec_id = CODEC_ID_PCM_DVD;
497 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
498 type = AVMEDIA_TYPE_AUDIO;
499 codec_id = CODEC_ID_TRUEHD;
500 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
501 /* Used for both AC-3 and E-AC-3 in EVOB files */
502 type = AVMEDIA_TYPE_AUDIO;
503 codec_id = CODEC_ID_AC3;
504 } else if (startcode >= 0x20 && startcode <= 0x3f) {
505 type = AVMEDIA_TYPE_SUBTITLE;
506 codec_id = CODEC_ID_DVD_SUBTITLE;
507 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
508 type = AVMEDIA_TYPE_VIDEO;
509 codec_id = CODEC_ID_VC1;
510 } else if (startcode == 0x1bd) {
511 // check dvd audio substream type
512 type = AVMEDIA_TYPE_AUDIO;
513 switch(dvdaudio_substream_type & 0xe0) {
514 case 0xa0: codec_id = CODEC_ID_PCM_DVD;
516 case 0x80: if((dvdaudio_substream_type & 0xf8) == 0x88)
517 codec_id = CODEC_ID_DTS;
518 else codec_id = CODEC_ID_AC3;
520 default: av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
526 avio_skip(s->pb, len);
529 /* no stream found: add a new stream */
530 st = av_new_stream(s, startcode);
533 st->codec->codec_type = type;
534 st->codec->codec_id = codec_id;
535 if (codec_id != CODEC_ID_PCM_S16BE)
536 st->need_parsing = AVSTREAM_PARSE_FULL;
538 if(st->discard >= AVDISCARD_ALL)
540 if ((startcode >= 0xa0 && startcode <= 0xaf) ||
541 (startcode == 0x1bd && ((dvdaudio_substream_type & 0xe0) == 0xa0))) {
544 /* for LPCM, we just skip the header and consider it is raw
548 avio_r8(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
549 b1 = avio_r8(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
550 avio_r8(s->pb); /* dynamic range control (0x80 = off) */
552 freq = (b1 >> 4) & 3;
553 st->codec->sample_rate = lpcm_freq_tab[freq];
554 st->codec->channels = 1 + (b1 & 7);
555 st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
556 st->codec->bit_rate = st->codec->channels *
557 st->codec->sample_rate *
558 st->codec->bits_per_coded_sample;
559 if (st->codec->bits_per_coded_sample == 16)
560 st->codec->codec_id = CODEC_ID_PCM_S16BE;
561 else if (st->codec->bits_per_coded_sample == 28)
562 return AVERROR(EINVAL);
564 av_new_packet(pkt, len);
565 avio_read(s->pb, pkt->data, pkt->size);
568 pkt->pos = dummy_pos;
569 pkt->stream_index = st->index;
570 av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
571 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
577 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
578 int64_t *ppos, int64_t pos_limit)
581 int64_t pos, pts, dts;
584 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
585 return AV_NOPTS_VALUE;
588 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
590 av_dlog(s, "none (ret=%d)\n", len);
591 return AV_NOPTS_VALUE;
593 if (startcode == s->streams[stream_index]->id &&
594 dts != AV_NOPTS_VALUE) {
597 avio_skip(s->pb, len);
599 av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
600 pos, dts, dts / 90000.0);
605 AVInputFormat ff_mpegps_demuxer = {
607 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS format"),
608 .priv_data_size = sizeof(MpegDemuxContext),
609 .read_probe = mpegps_probe,
610 .read_header = mpegps_read_header,
611 .read_packet = mpegps_read_packet,
612 .read_seek = NULL, //mpegps_read_seek,
613 .read_timestamp = mpegps_read_dts,
614 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,