3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 check_pack_header(const uint8_t *buf) {
53 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
56 static int mpegps_probe(AVProbeData *p)
59 int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
63 for(i=0; i<p->buf_size; i++){
64 code = (code<<8) + p->buf[i];
65 if ((code & 0xffffff00) == 0x100) {
66 int len= p->buf[i+1] << 8 | p->buf[i+2];
67 int pes= check_pes(p->buf+i, p->buf+p->buf_size);
68 int pack = check_pack_header(p->buf+i);
70 if(code == SYSTEM_HEADER_START_CODE) sys++;
71 else if(code == PACK_START_CODE && pack) pspack++;
72 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
73 // skip pes payload to avoid start code emulation for private
75 else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
76 else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
77 else if(code == 0x1fd && pes) vid++; //VC1
79 else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
80 else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
81 else if(code == PRIVATE_STREAM_1 && !pes) invalid++;
85 if(vid+audio > invalid+1) /* invalid VDR files nd short PES streams */
86 score= AVPROBE_SCORE_MAX/4;
88 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, invalid, p->buf_size);
89 if(sys>invalid && sys*9 <= pspack*10)
90 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
91 if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
92 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
93 if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
94 return (audio > 12 || vid > 3) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
96 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
97 //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
102 typedef struct MpegDemuxContext {
103 int32_t header_state;
104 unsigned char psm_es_type[256];
108 static int mpegps_read_header(AVFormatContext *s,
109 AVFormatParameters *ap)
111 MpegDemuxContext *m = s->priv_data;
112 const char *sofdec = "Sofdec";
114 int64_t last_pos = avio_tell(s->pb);
116 m->header_state = 0xff;
117 s->ctx_flags |= AVFMTCTX_NOHEADER;
122 m->header_state = m->header_state << 8 | v;
124 } while (v == sofdec[i] && i++ < 6);
126 m->sofdec = (m->sofdec == 6) ? 1 : 0;
129 avio_seek(s->pb, last_pos, SEEK_SET);
131 /* no need to do more */
135 static int64_t get_pts(AVIOContext *pb, int c)
139 buf[0] = c<0 ? avio_r8(pb) : c;
140 avio_read(pb, buf+1, 4);
142 return ff_parse_pes_pts(buf);
145 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
146 int32_t *header_state)
148 unsigned int state, v;
151 state = *header_state;
158 if (state == 0x000001) {
159 state = ((state << 8) | v) & 0xffffff;
163 state = ((state << 8) | v) & 0xffffff;
167 *header_state = state;
172 #if 0 /* unused, remove? */
174 static int find_prev_start_code(AVIOContext *pb, int *size_ptr)
176 int64_t pos, pos_start;
177 int max_size, start_code;
179 max_size = *size_ptr;
180 pos_start = avio_tell(pb);
182 /* in order to go faster, we fill the buffer */
183 pos = pos_start - 16386;
186 avio_seek(pb, pos, SEEK_SET);
192 if (pos < 0 || (pos_start - pos) >= max_size) {
196 avio_seek(pb, pos, SEEK_SET);
197 start_code = avio_rb32(pb);
198 if ((start_code & 0xffffff00) == 0x100)
202 *size_ptr = pos_start - pos;
208 * Extract stream types from a program stream map
209 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
211 * @return number of bytes occupied by PSM in the bitstream
213 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
215 int psm_length, ps_info_length, es_map_length;
217 psm_length = avio_rb16(pb);
220 ps_info_length = avio_rb16(pb);
222 /* skip program_stream_info */
223 avio_skip(pb, ps_info_length);
224 es_map_length = avio_rb16(pb);
226 /* at least one es available? */
227 while (es_map_length >= 4){
228 unsigned char type = avio_r8(pb);
229 unsigned char es_id = avio_r8(pb);
230 uint16_t es_info_length = avio_rb16(pb);
231 /* remember mapping from stream id to stream type */
232 m->psm_es_type[es_id] = type;
233 /* skip program_stream_info */
234 avio_skip(pb, es_info_length);
235 es_map_length -= 4 + es_info_length;
237 avio_rb32(pb); /* crc32 */
238 return 2 + psm_length;
241 /* read the next PES header. Return its position in ppos
242 (if not NULL), and its start code, pts and dts.
244 static int mpegps_read_pes_header(AVFormatContext *s,
245 int64_t *ppos, int *pstart_code,
246 int64_t *ppts, int64_t *pdts)
248 MpegDemuxContext *m = s->priv_data;
249 int len, size, startcode, c, flags, header_len;
250 int pes_ext, ext2_len, id_ext, skip;
252 int64_t last_sync= avio_tell(s->pb);
255 avio_seek(s->pb, last_sync, SEEK_SET);
257 /* next start code (should be immediately after) */
258 m->header_state = 0xff;
259 size = MAX_SYNC_SIZE;
260 startcode = find_next_start_code(s->pb, &size, &m->header_state);
261 last_sync = avio_tell(s->pb);
262 //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, avio_tell(s->pb));
266 //FIXME we should remember header_state
267 return AVERROR(EAGAIN);
270 if (startcode == PACK_START_CODE)
272 if (startcode == SYSTEM_HEADER_START_CODE)
274 if (startcode == PADDING_STREAM) {
275 avio_skip(s->pb, avio_rb16(s->pb));
278 if (startcode == PRIVATE_STREAM_2) {
279 len = avio_rb16(s->pb);
282 if (avio_r8(s->pb) == 'S') {
284 avio_read(s->pb, buf, sizeof(buf));
285 m->sofdec = !memcmp(buf, "ofdec", 5);
290 m->sofdec -= !m->sofdec;
292 avio_skip(s->pb, len);
295 if (startcode == PROGRAM_STREAM_MAP) {
296 mpegps_psm_parse(m, s->pb);
300 /* find matching stream */
301 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
302 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
303 (startcode == 0x1bd) || (startcode == 0x1fd)))
306 *ppos = avio_tell(s->pb) - 4;
308 len = avio_rb16(s->pb);
310 dts = AV_NOPTS_VALUE;
317 /* XXX: for mpeg1, should test only bit 7 */
321 if ((c & 0xc0) == 0x40) {
322 /* buffer scale & size */
327 if ((c & 0xe0) == 0x20) {
328 dts = pts = get_pts(s->pb, c);
331 dts = get_pts(s->pb, -1);
334 } else if ((c & 0xc0) == 0x80) {
336 #if 0 /* some streams have this field set for no apparent reason */
337 if ((c & 0x30) != 0) {
338 /* Encrypted multiplex not handled */
342 flags = avio_r8(s->pb);
343 header_len = avio_r8(s->pb);
345 if (header_len > len)
349 dts = pts = get_pts(s->pb, -1);
352 dts = get_pts(s->pb, -1);
356 if (flags & 0x3f && header_len == 0){
358 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
360 if (flags & 0x01) { /* PES extension */
361 pes_ext = avio_r8(s->pb);
363 /* Skip PES private data, program packet sequence counter and P-STD buffer */
364 skip = (pes_ext >> 4) & 0xb;
366 if (pes_ext & 0x40 || skip > header_len){
367 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
370 avio_skip(s->pb, skip);
373 if (pes_ext & 0x01) { /* PES extension 2 */
374 ext2_len = avio_r8(s->pb);
376 if ((ext2_len & 0x7f) > 0) {
377 id_ext = avio_r8(s->pb);
378 if ((id_ext & 0x80) == 0)
379 startcode = ((startcode & 0xff) << 8) | id_ext;
386 avio_skip(s->pb, header_len);
391 if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
392 startcode = avio_r8(s->pb);
394 if (startcode >= 0x80 && startcode <= 0xcf) {
395 /* audio: skip header */
400 if (startcode >= 0xb0 && startcode <= 0xbf) {
401 /* MLP/TrueHD audio has a 4-byte header */
409 if(dts != AV_NOPTS_VALUE && ppos){
411 for(i=0; i<s->nb_streams; i++){
412 if(startcode == s->streams[i]->id &&
413 s->pb->seekable /* index useless on streams anyway */) {
414 ff_reduce_index(s, i);
415 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
420 *pstart_code = startcode;
426 static int mpegps_read_packet(AVFormatContext *s,
429 MpegDemuxContext *m = s->priv_data;
431 int len, startcode, i, es_type, ret;
432 int request_probe= 0;
433 enum CodecID codec_id = CODEC_ID_NONE;
434 enum AVMediaType type;
435 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
436 uint8_t av_uninit(dvdaudio_substream_type);
439 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
443 if(startcode == 0x1bd) {
444 dvdaudio_substream_type = avio_r8(s->pb);
449 /* now find stream */
450 for(i=0;i<s->nb_streams;i++) {
452 if (st->id == startcode)
456 es_type = m->psm_es_type[startcode & 0xff];
457 if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
458 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
459 codec_id = CODEC_ID_MPEG2VIDEO;
460 type = AVMEDIA_TYPE_VIDEO;
461 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
462 codec_id = CODEC_ID_MPEG2VIDEO;
463 type = AVMEDIA_TYPE_VIDEO;
464 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
465 es_type == STREAM_TYPE_AUDIO_MPEG2){
466 codec_id = CODEC_ID_MP3;
467 type = AVMEDIA_TYPE_AUDIO;
468 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
469 codec_id = CODEC_ID_AAC;
470 type = AVMEDIA_TYPE_AUDIO;
471 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
472 codec_id = CODEC_ID_MPEG4;
473 type = AVMEDIA_TYPE_VIDEO;
474 } else if(es_type == STREAM_TYPE_VIDEO_H264){
475 codec_id = CODEC_ID_H264;
476 type = AVMEDIA_TYPE_VIDEO;
477 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
478 codec_id = CODEC_ID_AC3;
479 type = AVMEDIA_TYPE_AUDIO;
483 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
484 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
485 unsigned char buf[8];
486 avio_read(s->pb, buf, 8);
487 avio_seek(s->pb, -8, SEEK_CUR);
488 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
489 codec_id = CODEC_ID_CAVS;
492 type = AVMEDIA_TYPE_VIDEO;
493 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
494 type = AVMEDIA_TYPE_AUDIO;
495 codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
496 } else if (startcode >= 0x80 && startcode <= 0x87) {
497 type = AVMEDIA_TYPE_AUDIO;
498 codec_id = CODEC_ID_AC3;
499 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
500 ||( startcode >= 0x98 && startcode <= 0x9f)) {
501 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
502 type = AVMEDIA_TYPE_AUDIO;
503 codec_id = CODEC_ID_DTS;
504 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
505 type = AVMEDIA_TYPE_AUDIO;
506 /* 16 bit form will be handled as CODEC_ID_PCM_S16BE */
507 codec_id = CODEC_ID_PCM_DVD;
508 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
509 type = AVMEDIA_TYPE_AUDIO;
510 codec_id = CODEC_ID_TRUEHD;
511 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
512 /* Used for both AC-3 and E-AC-3 in EVOB files */
513 type = AVMEDIA_TYPE_AUDIO;
514 codec_id = CODEC_ID_AC3;
515 } else if (startcode >= 0x20 && startcode <= 0x3f) {
516 type = AVMEDIA_TYPE_SUBTITLE;
517 codec_id = CODEC_ID_DVD_SUBTITLE;
518 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
519 type = AVMEDIA_TYPE_VIDEO;
520 codec_id = CODEC_ID_VC1;
521 } else if (startcode == 0x1bd) {
522 // check dvd audio substream type
523 type = AVMEDIA_TYPE_AUDIO;
524 switch(dvdaudio_substream_type & 0xe0) {
525 case 0xa0: codec_id = CODEC_ID_PCM_DVD;
527 case 0x80: if((dvdaudio_substream_type & 0xf8) == 0x88)
528 codec_id = CODEC_ID_DTS;
529 else codec_id = CODEC_ID_AC3;
531 default: av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
537 avio_skip(s->pb, len);
540 /* no stream found: add a new stream */
541 st = av_new_stream(s, startcode);
544 st->codec->codec_type = type;
545 st->codec->codec_id = codec_id;
546 st->request_probe = request_probe;
547 if (codec_id != CODEC_ID_PCM_S16BE)
548 st->need_parsing = AVSTREAM_PARSE_FULL;
550 if(st->discard >= AVDISCARD_ALL)
552 if ((startcode >= 0xa0 && startcode <= 0xaf) ||
553 (startcode == 0x1bd && ((dvdaudio_substream_type & 0xe0) == 0xa0))) {
556 /* for LPCM, we just skip the header and consider it is raw
560 avio_r8(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
561 b1 = avio_r8(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
562 avio_r8(s->pb); /* dynamic range control (0x80 = off) */
564 freq = (b1 >> 4) & 3;
565 st->codec->sample_rate = lpcm_freq_tab[freq];
566 st->codec->channels = 1 + (b1 & 7);
567 st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
568 st->codec->bit_rate = st->codec->channels *
569 st->codec->sample_rate *
570 st->codec->bits_per_coded_sample;
571 if (st->codec->bits_per_coded_sample == 16)
572 st->codec->codec_id = CODEC_ID_PCM_S16BE;
573 else if (st->codec->bits_per_coded_sample == 28)
574 return AVERROR(EINVAL);
576 av_new_packet(pkt, len);
577 ret = avio_read(s->pb, pkt->data, pkt->size);
580 } else if (ret < pkt->size) {
582 memset(pkt->data + ret, 0, FF_INPUT_BUFFER_PADDING_SIZE);
586 pkt->pos = dummy_pos;
587 pkt->stream_index = st->index;
588 av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
589 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
592 return (ret < 0) ? ret : 0;
595 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
596 int64_t *ppos, int64_t pos_limit)
599 int64_t pos, pts, dts;
602 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
603 return AV_NOPTS_VALUE;
606 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
608 av_dlog(s, "none (ret=%d)\n", len);
609 return AV_NOPTS_VALUE;
611 if (startcode == s->streams[stream_index]->id &&
612 dts != AV_NOPTS_VALUE) {
615 avio_skip(s->pb, len);
617 av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
618 pos, dts, dts / 90000.0);
623 AVInputFormat ff_mpegps_demuxer = {
625 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS format"),
626 .priv_data_size = sizeof(MpegDemuxContext),
627 .read_probe = mpegps_probe,
628 .read_header = mpegps_read_header,
629 .read_packet = mpegps_read_packet,
630 .read_seek = NULL, //mpegps_read_seek,
631 .read_timestamp = mpegps_read_dts,
632 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,