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;
123 } while (v == sofdec[i] && i++ < 6);
125 m->sofdec = (m->sofdec == 6) ? 1 : 0;
128 avio_seek(s->pb, last_pos, SEEK_SET);
130 /* no need to do more */
134 static int64_t get_pts(AVIOContext *pb, int c)
138 buf[0] = c<0 ? avio_r8(pb) : c;
139 avio_read(pb, buf+1, 4);
141 return ff_parse_pes_pts(buf);
144 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
145 int32_t *header_state)
147 unsigned int state, v;
150 state = *header_state;
157 if (state == 0x000001) {
158 state = ((state << 8) | v) & 0xffffff;
162 state = ((state << 8) | v) & 0xffffff;
166 *header_state = state;
171 #if 0 /* unused, remove? */
173 static int find_prev_start_code(AVIOContext *pb, int *size_ptr)
175 int64_t pos, pos_start;
176 int max_size, start_code;
178 max_size = *size_ptr;
179 pos_start = avio_tell(pb);
181 /* in order to go faster, we fill the buffer */
182 pos = pos_start - 16386;
185 avio_seek(pb, pos, SEEK_SET);
191 if (pos < 0 || (pos_start - pos) >= max_size) {
195 avio_seek(pb, pos, SEEK_SET);
196 start_code = avio_rb32(pb);
197 if ((start_code & 0xffffff00) == 0x100)
201 *size_ptr = pos_start - pos;
207 * Extract stream types from a program stream map
208 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
210 * @return number of bytes occupied by PSM in the bitstream
212 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
214 int psm_length, ps_info_length, es_map_length;
216 psm_length = avio_rb16(pb);
219 ps_info_length = avio_rb16(pb);
221 /* skip program_stream_info */
222 avio_skip(pb, ps_info_length);
223 es_map_length = avio_rb16(pb);
225 /* at least one es available? */
226 while (es_map_length >= 4){
227 unsigned char type = avio_r8(pb);
228 unsigned char es_id = avio_r8(pb);
229 uint16_t es_info_length = avio_rb16(pb);
230 /* remember mapping from stream id to stream type */
231 m->psm_es_type[es_id] = type;
232 /* skip program_stream_info */
233 avio_skip(pb, es_info_length);
234 es_map_length -= 4 + es_info_length;
236 avio_rb32(pb); /* crc32 */
237 return 2 + psm_length;
240 /* read the next PES header. Return its position in ppos
241 (if not NULL), and its start code, pts and dts.
243 static int mpegps_read_pes_header(AVFormatContext *s,
244 int64_t *ppos, int *pstart_code,
245 int64_t *ppts, int64_t *pdts)
247 MpegDemuxContext *m = s->priv_data;
248 int len, size, startcode, c, flags, header_len;
249 int pes_ext, ext2_len, id_ext, skip;
251 int64_t last_sync= avio_tell(s->pb);
254 avio_seek(s->pb, last_sync, SEEK_SET);
256 /* next start code (should be immediately after) */
257 m->header_state = 0xff;
258 size = MAX_SYNC_SIZE;
259 startcode = find_next_start_code(s->pb, &size, &m->header_state);
260 last_sync = avio_tell(s->pb);
261 //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, avio_tell(s->pb));
265 //FIXME we should remember header_state
266 return AVERROR(EAGAIN);
269 if (startcode == PACK_START_CODE)
271 if (startcode == SYSTEM_HEADER_START_CODE)
273 if (startcode == PADDING_STREAM) {
274 avio_skip(s->pb, avio_rb16(s->pb));
277 if (startcode == PRIVATE_STREAM_2) {
278 len = avio_rb16(s->pb);
281 if (avio_r8(s->pb) == 'S') {
283 avio_read(s->pb, buf, sizeof(buf));
284 m->sofdec = !memcmp(buf, "ofdec", 5);
289 m->sofdec -= !m->sofdec;
291 avio_skip(s->pb, len);
294 if (startcode == PROGRAM_STREAM_MAP) {
295 mpegps_psm_parse(m, s->pb);
299 /* find matching stream */
300 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
301 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
302 (startcode == 0x1bd) || (startcode == 0x1fd)))
305 *ppos = avio_tell(s->pb) - 4;
307 len = avio_rb16(s->pb);
309 dts = AV_NOPTS_VALUE;
316 /* XXX: for mpeg1, should test only bit 7 */
320 if ((c & 0xc0) == 0x40) {
321 /* buffer scale & size */
326 if ((c & 0xe0) == 0x20) {
327 dts = pts = get_pts(s->pb, c);
330 dts = get_pts(s->pb, -1);
333 } else if ((c & 0xc0) == 0x80) {
335 #if 0 /* some streams have this field set for no apparent reason */
336 if ((c & 0x30) != 0) {
337 /* Encrypted multiplex not handled */
341 flags = avio_r8(s->pb);
342 header_len = avio_r8(s->pb);
344 if (header_len > len)
348 dts = pts = get_pts(s->pb, -1);
351 dts = get_pts(s->pb, -1);
355 if (flags & 0x3f && header_len == 0){
357 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
359 if (flags & 0x01) { /* PES extension */
360 pes_ext = avio_r8(s->pb);
362 /* Skip PES private data, program packet sequence counter and P-STD buffer */
363 skip = (pes_ext >> 4) & 0xb;
365 if (pes_ext & 0x40 || skip > header_len){
366 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
369 avio_skip(s->pb, skip);
372 if (pes_ext & 0x01) { /* PES extension 2 */
373 ext2_len = avio_r8(s->pb);
375 if ((ext2_len & 0x7f) > 0) {
376 id_ext = avio_r8(s->pb);
377 if ((id_ext & 0x80) == 0)
378 startcode = ((startcode & 0xff) << 8) | id_ext;
385 avio_skip(s->pb, header_len);
390 if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
391 startcode = avio_r8(s->pb);
393 if (startcode >= 0x80 && startcode <= 0xcf) {
394 /* audio: skip header */
399 if (startcode >= 0xb0 && startcode <= 0xbf) {
400 /* MLP/TrueHD audio has a 4-byte header */
408 if(dts != AV_NOPTS_VALUE && ppos){
410 for(i=0; i<s->nb_streams; i++){
411 if(startcode == s->streams[i]->id &&
412 s->pb->seekable /* index useless on streams anyway */) {
413 ff_reduce_index(s, i);
414 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
419 *pstart_code = startcode;
425 static int mpegps_read_packet(AVFormatContext *s,
428 MpegDemuxContext *m = s->priv_data;
430 int len, startcode, i, es_type, ret;
431 int request_probe= 0;
432 enum CodecID codec_id = CODEC_ID_NONE;
433 enum AVMediaType type;
434 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
435 uint8_t av_uninit(dvdaudio_substream_type);
438 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
442 if(startcode == 0x1bd) {
443 dvdaudio_substream_type = avio_r8(s->pb);
448 /* now find stream */
449 for(i=0;i<s->nb_streams;i++) {
451 if (st->id == startcode)
455 es_type = m->psm_es_type[startcode & 0xff];
456 if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
457 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
458 codec_id = CODEC_ID_MPEG2VIDEO;
459 type = AVMEDIA_TYPE_VIDEO;
460 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
461 codec_id = CODEC_ID_MPEG2VIDEO;
462 type = AVMEDIA_TYPE_VIDEO;
463 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
464 es_type == STREAM_TYPE_AUDIO_MPEG2){
465 codec_id = CODEC_ID_MP3;
466 type = AVMEDIA_TYPE_AUDIO;
467 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
468 codec_id = CODEC_ID_AAC;
469 type = AVMEDIA_TYPE_AUDIO;
470 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
471 codec_id = CODEC_ID_MPEG4;
472 type = AVMEDIA_TYPE_VIDEO;
473 } else if(es_type == STREAM_TYPE_VIDEO_H264){
474 codec_id = CODEC_ID_H264;
475 type = AVMEDIA_TYPE_VIDEO;
476 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
477 codec_id = CODEC_ID_AC3;
478 type = AVMEDIA_TYPE_AUDIO;
482 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
483 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
484 unsigned char buf[8];
485 avio_read(s->pb, buf, 8);
486 avio_seek(s->pb, -8, SEEK_CUR);
487 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
488 codec_id = CODEC_ID_CAVS;
491 type = AVMEDIA_TYPE_VIDEO;
492 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
493 type = AVMEDIA_TYPE_AUDIO;
494 codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
495 } else if (startcode >= 0x80 && startcode <= 0x87) {
496 type = AVMEDIA_TYPE_AUDIO;
497 codec_id = CODEC_ID_AC3;
498 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
499 ||( startcode >= 0x98 && startcode <= 0x9f)) {
500 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
501 type = AVMEDIA_TYPE_AUDIO;
502 codec_id = CODEC_ID_DTS;
503 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
504 type = AVMEDIA_TYPE_AUDIO;
505 /* 16 bit form will be handled as CODEC_ID_PCM_S16BE */
506 codec_id = CODEC_ID_PCM_DVD;
507 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
508 type = AVMEDIA_TYPE_AUDIO;
509 codec_id = CODEC_ID_TRUEHD;
510 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
511 /* Used for both AC-3 and E-AC-3 in EVOB files */
512 type = AVMEDIA_TYPE_AUDIO;
513 codec_id = CODEC_ID_AC3;
514 } else if (startcode >= 0x20 && startcode <= 0x3f) {
515 type = AVMEDIA_TYPE_SUBTITLE;
516 codec_id = CODEC_ID_DVD_SUBTITLE;
517 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
518 type = AVMEDIA_TYPE_VIDEO;
519 codec_id = CODEC_ID_VC1;
520 } else if (startcode == 0x1bd) {
521 // check dvd audio substream type
522 type = AVMEDIA_TYPE_AUDIO;
523 switch(dvdaudio_substream_type & 0xe0) {
524 case 0xa0: codec_id = CODEC_ID_PCM_DVD;
526 case 0x80: if((dvdaudio_substream_type & 0xf8) == 0x88)
527 codec_id = CODEC_ID_DTS;
528 else codec_id = CODEC_ID_AC3;
530 default: av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
536 avio_skip(s->pb, len);
539 /* no stream found: add a new stream */
540 st = av_new_stream(s, startcode);
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_seek = NULL, //mpegps_read_seek,
623 .read_timestamp = mpegps_read_dts,
624 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,