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)
110 MpegDemuxContext *m = s->priv_data;
111 const char *sofdec = "Sofdec";
113 int64_t last_pos = avio_tell(s->pb);
115 m->header_state = 0xff;
116 s->ctx_flags |= AVFMTCTX_NOHEADER;
122 } while (v == sofdec[i] && i++ < 6);
124 m->sofdec = (m->sofdec == 6) ? 1 : 0;
127 avio_seek(s->pb, last_pos, SEEK_SET);
129 /* no need to do more */
133 static int64_t get_pts(AVIOContext *pb, int c)
137 buf[0] = c<0 ? avio_r8(pb) : c;
138 avio_read(pb, buf+1, 4);
140 return ff_parse_pes_pts(buf);
143 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
144 int32_t *header_state)
146 unsigned int state, v;
149 state = *header_state;
156 if (state == 0x000001) {
157 state = ((state << 8) | v) & 0xffffff;
161 state = ((state << 8) | v) & 0xffffff;
165 *header_state = state;
170 #if 0 /* unused, remove? */
172 static int find_prev_start_code(AVIOContext *pb, int *size_ptr)
174 int64_t pos, pos_start;
175 int max_size, start_code;
177 max_size = *size_ptr;
178 pos_start = avio_tell(pb);
180 /* in order to go faster, we fill the buffer */
181 pos = pos_start - 16386;
184 avio_seek(pb, pos, SEEK_SET);
190 if (pos < 0 || (pos_start - pos) >= max_size) {
194 avio_seek(pb, pos, SEEK_SET);
195 start_code = avio_rb32(pb);
196 if ((start_code & 0xffffff00) == 0x100)
200 *size_ptr = pos_start - pos;
206 * Extract stream types from a program stream map
207 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
209 * @return number of bytes occupied by PSM in the bitstream
211 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
213 int psm_length, ps_info_length, es_map_length;
215 psm_length = avio_rb16(pb);
218 ps_info_length = avio_rb16(pb);
220 /* skip program_stream_info */
221 avio_skip(pb, ps_info_length);
222 es_map_length = avio_rb16(pb);
224 /* at least one es available? */
225 while (es_map_length >= 4){
226 unsigned char type = avio_r8(pb);
227 unsigned char es_id = avio_r8(pb);
228 uint16_t es_info_length = avio_rb16(pb);
229 /* remember mapping from stream id to stream type */
230 m->psm_es_type[es_id] = type;
231 /* skip program_stream_info */
232 avio_skip(pb, es_info_length);
233 es_map_length -= 4 + es_info_length;
235 avio_rb32(pb); /* crc32 */
236 return 2 + psm_length;
239 /* read the next PES header. Return its position in ppos
240 (if not NULL), and its start code, pts and dts.
242 static int mpegps_read_pes_header(AVFormatContext *s,
243 int64_t *ppos, int *pstart_code,
244 int64_t *ppts, int64_t *pdts)
246 MpegDemuxContext *m = s->priv_data;
247 int len, size, startcode, c, flags, header_len;
248 int pes_ext, ext2_len, id_ext, skip;
250 int64_t last_sync= avio_tell(s->pb);
253 avio_seek(s->pb, last_sync, SEEK_SET);
255 /* next start code (should be immediately after) */
256 m->header_state = 0xff;
257 size = MAX_SYNC_SIZE;
258 startcode = find_next_start_code(s->pb, &size, &m->header_state);
259 last_sync = avio_tell(s->pb);
260 //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, avio_tell(s->pb));
264 //FIXME we should remember header_state
265 return AVERROR(EAGAIN);
268 if (startcode == PACK_START_CODE)
270 if (startcode == SYSTEM_HEADER_START_CODE)
272 if (startcode == PADDING_STREAM) {
273 avio_skip(s->pb, avio_rb16(s->pb));
276 if (startcode == PRIVATE_STREAM_2) {
277 len = avio_rb16(s->pb);
280 if (avio_r8(s->pb) == 'S') {
282 avio_read(s->pb, buf, sizeof(buf));
283 m->sofdec = !memcmp(buf, "ofdec", 5);
288 m->sofdec -= !m->sofdec;
290 avio_skip(s->pb, len);
293 if (startcode == PROGRAM_STREAM_MAP) {
294 mpegps_psm_parse(m, s->pb);
298 /* find matching stream */
299 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
300 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
301 (startcode == 0x1bd) || (startcode == 0x1fd)))
304 *ppos = avio_tell(s->pb) - 4;
306 len = avio_rb16(s->pb);
308 dts = AV_NOPTS_VALUE;
315 /* XXX: for mpeg1, should test only bit 7 */
319 if ((c & 0xc0) == 0x40) {
320 /* buffer scale & size */
325 if ((c & 0xe0) == 0x20) {
326 dts = pts = get_pts(s->pb, c);
329 dts = get_pts(s->pb, -1);
332 } else if ((c & 0xc0) == 0x80) {
334 #if 0 /* some streams have this field set for no apparent reason */
335 if ((c & 0x30) != 0) {
336 /* Encrypted multiplex not handled */
340 flags = avio_r8(s->pb);
341 header_len = avio_r8(s->pb);
343 if (header_len > len)
347 dts = pts = get_pts(s->pb, -1);
350 dts = get_pts(s->pb, -1);
354 if (flags & 0x3f && header_len == 0){
356 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
358 if (flags & 0x01) { /* PES extension */
359 pes_ext = avio_r8(s->pb);
361 /* Skip PES private data, program packet sequence counter and P-STD buffer */
362 skip = (pes_ext >> 4) & 0xb;
364 if (pes_ext & 0x40 || skip > header_len){
365 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
368 avio_skip(s->pb, skip);
371 if (pes_ext & 0x01) { /* PES extension 2 */
372 ext2_len = avio_r8(s->pb);
374 if ((ext2_len & 0x7f) > 0) {
375 id_ext = avio_r8(s->pb);
376 if ((id_ext & 0x80) == 0)
377 startcode = ((startcode & 0xff) << 8) | id_ext;
384 avio_skip(s->pb, header_len);
389 if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
390 startcode = avio_r8(s->pb);
392 if (startcode >= 0x80 && startcode <= 0xcf) {
393 /* audio: skip header */
398 if (startcode >= 0xb0 && startcode <= 0xbf) {
399 /* MLP/TrueHD audio has a 4-byte header */
407 if(dts != AV_NOPTS_VALUE && ppos){
409 for(i=0; i<s->nb_streams; i++){
410 if(startcode == s->streams[i]->id &&
411 s->pb->seekable /* index useless on streams anyway */) {
412 ff_reduce_index(s, i);
413 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
418 *pstart_code = startcode;
424 static int mpegps_read_packet(AVFormatContext *s,
427 MpegDemuxContext *m = s->priv_data;
429 int len, startcode, i, es_type, ret;
430 int request_probe= 0;
431 enum CodecID codec_id = CODEC_ID_NONE;
432 enum AVMediaType type;
433 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
434 uint8_t av_uninit(dvdaudio_substream_type);
437 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
441 if(startcode == 0x1bd) {
442 dvdaudio_substream_type = avio_r8(s->pb);
447 /* now find stream */
448 for(i=0;i<s->nb_streams;i++) {
450 if (st->id == startcode)
454 es_type = m->psm_es_type[startcode & 0xff];
455 if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
456 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
457 codec_id = CODEC_ID_MPEG2VIDEO;
458 type = AVMEDIA_TYPE_VIDEO;
459 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
460 codec_id = CODEC_ID_MPEG2VIDEO;
461 type = AVMEDIA_TYPE_VIDEO;
462 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
463 es_type == STREAM_TYPE_AUDIO_MPEG2){
464 codec_id = CODEC_ID_MP3;
465 type = AVMEDIA_TYPE_AUDIO;
466 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
467 codec_id = CODEC_ID_AAC;
468 type = AVMEDIA_TYPE_AUDIO;
469 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
470 codec_id = CODEC_ID_MPEG4;
471 type = AVMEDIA_TYPE_VIDEO;
472 } else if(es_type == STREAM_TYPE_VIDEO_H264){
473 codec_id = CODEC_ID_H264;
474 type = AVMEDIA_TYPE_VIDEO;
475 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
476 codec_id = CODEC_ID_AC3;
477 type = AVMEDIA_TYPE_AUDIO;
481 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
482 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
483 unsigned char buf[8];
484 avio_read(s->pb, buf, 8);
485 avio_seek(s->pb, -8, SEEK_CUR);
486 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
487 codec_id = CODEC_ID_CAVS;
490 type = AVMEDIA_TYPE_VIDEO;
491 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
492 type = AVMEDIA_TYPE_AUDIO;
493 codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
494 } else if (startcode >= 0x80 && startcode <= 0x87) {
495 type = AVMEDIA_TYPE_AUDIO;
496 codec_id = CODEC_ID_AC3;
497 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
498 ||( startcode >= 0x98 && startcode <= 0x9f)) {
499 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
500 type = AVMEDIA_TYPE_AUDIO;
501 codec_id = CODEC_ID_DTS;
502 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
503 type = AVMEDIA_TYPE_AUDIO;
504 /* 16 bit form will be handled as CODEC_ID_PCM_S16BE */
505 codec_id = CODEC_ID_PCM_DVD;
506 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
507 type = AVMEDIA_TYPE_AUDIO;
508 codec_id = CODEC_ID_TRUEHD;
509 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
510 /* Used for both AC-3 and E-AC-3 in EVOB files */
511 type = AVMEDIA_TYPE_AUDIO;
512 codec_id = CODEC_ID_AC3;
513 } else if (startcode >= 0x20 && startcode <= 0x3f) {
514 type = AVMEDIA_TYPE_SUBTITLE;
515 codec_id = CODEC_ID_DVD_SUBTITLE;
516 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
517 type = AVMEDIA_TYPE_VIDEO;
518 codec_id = CODEC_ID_VC1;
519 } else if (startcode == 0x1bd) {
520 // check dvd audio substream type
521 type = AVMEDIA_TYPE_AUDIO;
522 switch(dvdaudio_substream_type & 0xe0) {
523 case 0xa0: codec_id = CODEC_ID_PCM_DVD;
525 case 0x80: if((dvdaudio_substream_type & 0xf8) == 0x88)
526 codec_id = CODEC_ID_DTS;
527 else codec_id = CODEC_ID_AC3;
529 default: av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
535 avio_skip(s->pb, len);
538 /* no stream found: add a new stream */
539 st = avformat_new_stream(s, NULL);
543 st->codec->codec_type = type;
544 st->codec->codec_id = codec_id;
545 st->request_probe = request_probe;
546 if (codec_id != CODEC_ID_PCM_S16BE)
547 st->need_parsing = AVSTREAM_PARSE_FULL;
549 if(st->discard >= AVDISCARD_ALL)
551 if ((startcode >= 0xa0 && startcode <= 0xaf) ||
552 (startcode == 0x1bd && ((dvdaudio_substream_type & 0xe0) == 0xa0))) {
555 /* for LPCM, we just skip the header and consider it is raw
559 avio_r8(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
560 b1 = avio_r8(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
561 avio_r8(s->pb); /* dynamic range control (0x80 = off) */
563 freq = (b1 >> 4) & 3;
564 st->codec->sample_rate = lpcm_freq_tab[freq];
565 st->codec->channels = 1 + (b1 & 7);
566 st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
567 st->codec->bit_rate = st->codec->channels *
568 st->codec->sample_rate *
569 st->codec->bits_per_coded_sample;
570 if (st->codec->bits_per_coded_sample == 16)
571 st->codec->codec_id = CODEC_ID_PCM_S16BE;
572 else if (st->codec->bits_per_coded_sample == 28)
573 return AVERROR(EINVAL);
575 ret = av_get_packet(s->pb, pkt, len);
578 pkt->pos = dummy_pos;
579 pkt->stream_index = st->index;
580 av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
581 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
584 return (ret < 0) ? ret : 0;
587 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
588 int64_t *ppos, int64_t pos_limit)
591 int64_t pos, pts, dts;
594 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
595 return AV_NOPTS_VALUE;
598 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
600 av_dlog(s, "none (ret=%d)\n", len);
601 return AV_NOPTS_VALUE;
603 if (startcode == s->streams[stream_index]->id &&
604 dts != AV_NOPTS_VALUE) {
607 avio_skip(s->pb, len);
609 av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
610 pos, dts, dts / 90000.0);
615 AVInputFormat ff_mpegps_demuxer = {
617 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS format"),
618 .priv_data_size = sizeof(MpegDemuxContext),
619 .read_probe = mpegps_probe,
620 .read_header = mpegps_read_header,
621 .read_packet = mpegps_read_packet,
622 .read_timestamp = mpegps_read_dts,
623 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,