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
31 /*********************************************/
34 #define MAX_SYNC_SIZE 100000
36 static int check_pes(uint8_t *p, uint8_t *end){
38 int pes2= (p[3] & 0xC0) == 0x80
39 && (p[4] & 0xC0) != 0x40
40 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
42 for(p+=3; p<end && *p == 0xFF; p++);
43 if((*p&0xC0) == 0x40) p+=2;
44 if((*p&0xF0) == 0x20){
45 pes1= p[0]&p[2]&p[4]&1;
46 }else if((*p&0xF0) == 0x30){
47 pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
54 static int mpegps_probe(AVProbeData *p)
57 int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
61 for(i=0; i<p->buf_size; i++){
62 code = (code<<8) + p->buf[i];
63 if ((code & 0xffffff00) == 0x100) {
64 int len= p->buf[i+1] << 8 | p->buf[i+2];
65 int pes= check_pes(p->buf+i, p->buf+p->buf_size);
67 if(code == SYSTEM_HEADER_START_CODE) sys++;
68 else if(code == PACK_START_CODE) pspack++;
69 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
70 // skip pes payload to avoid start code emulation for private
72 else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
73 else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
74 else if(code == 0x1fd && pes) vid++; //VC1
76 else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
77 else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
78 else if(code == PRIVATE_STREAM_1 && !pes) invalid++;
82 if(vid+audio > invalid+1) /* invalid VDR files nd short PES streams */
83 score= AVPROBE_SCORE_MAX/4;
85 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, invalid, p->buf_size);
86 if(sys>invalid && sys*9 <= pspack*10)
87 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
88 if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
89 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
90 if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
91 return (audio > 12 || vid > 3) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
93 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
94 //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
99 typedef struct MpegDemuxContext {
100 int32_t header_state;
101 unsigned char psm_es_type[256];
105 static int mpegps_read_header(AVFormatContext *s,
106 AVFormatParameters *ap)
108 MpegDemuxContext *m = s->priv_data;
109 const char *sofdec = "Sofdec";
112 m->header_state = 0xff;
113 s->ctx_flags |= AVFMTCTX_NOHEADER;
118 m->header_state = m->header_state << 8 | v;
120 } while (v == sofdec[i] && i++ < 6);
122 m->sofdec = (m->sofdec == 6) ? 1 : 0;
124 /* no need to do more */
128 static int64_t get_pts(AVIOContext *pb, int c)
132 buf[0] = c<0 ? avio_r8(pb) : c;
133 avio_read(pb, buf+1, 4);
135 return ff_parse_pes_pts(buf);
138 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
139 int32_t *header_state)
141 unsigned int state, v;
144 state = *header_state;
151 if (state == 0x000001) {
152 state = ((state << 8) | v) & 0xffffff;
156 state = ((state << 8) | v) & 0xffffff;
160 *header_state = state;
165 #if 0 /* unused, remove? */
167 static int find_prev_start_code(AVIOContext *pb, int *size_ptr)
169 int64_t pos, pos_start;
170 int max_size, start_code;
172 max_size = *size_ptr;
173 pos_start = avio_tell(pb);
175 /* in order to go faster, we fill the buffer */
176 pos = pos_start - 16386;
179 avio_seek(pb, pos, SEEK_SET);
185 if (pos < 0 || (pos_start - pos) >= max_size) {
189 avio_seek(pb, pos, SEEK_SET);
190 start_code = avio_rb32(pb);
191 if ((start_code & 0xffffff00) == 0x100)
195 *size_ptr = pos_start - pos;
201 * Extract stream types from a program stream map
202 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
204 * @return number of bytes occupied by PSM in the bitstream
206 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
208 int psm_length, ps_info_length, es_map_length;
210 psm_length = avio_rb16(pb);
213 ps_info_length = avio_rb16(pb);
215 /* skip program_stream_info */
216 avio_skip(pb, ps_info_length);
217 es_map_length = avio_rb16(pb);
219 /* at least one es available? */
220 while (es_map_length >= 4){
221 unsigned char type = avio_r8(pb);
222 unsigned char es_id = avio_r8(pb);
223 uint16_t es_info_length = avio_rb16(pb);
224 /* remember mapping from stream id to stream type */
225 m->psm_es_type[es_id] = type;
226 /* skip program_stream_info */
227 avio_skip(pb, es_info_length);
228 es_map_length -= 4 + es_info_length;
230 avio_rb32(pb); /* crc32 */
231 return 2 + psm_length;
234 /* read the next PES header. Return its position in ppos
235 (if not NULL), and its start code, pts and dts.
237 static int mpegps_read_pes_header(AVFormatContext *s,
238 int64_t *ppos, int *pstart_code,
239 int64_t *ppts, int64_t *pdts)
241 MpegDemuxContext *m = s->priv_data;
242 int len, size, startcode, c, flags, header_len;
243 int pes_ext, ext2_len, id_ext, skip;
245 int64_t last_sync= avio_tell(s->pb);
248 avio_seek(s->pb, last_sync, SEEK_SET);
250 /* next start code (should be immediately after) */
251 m->header_state = 0xff;
252 size = MAX_SYNC_SIZE;
253 startcode = find_next_start_code(s->pb, &size, &m->header_state);
254 last_sync = avio_tell(s->pb);
255 //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, avio_tell(s->pb));
259 //FIXME we should remember header_state
260 return AVERROR(EAGAIN);
263 if (startcode == PACK_START_CODE)
265 if (startcode == SYSTEM_HEADER_START_CODE)
267 if (startcode == PADDING_STREAM) {
268 avio_skip(s->pb, avio_rb16(s->pb));
271 if (startcode == PRIVATE_STREAM_2) {
272 len = avio_rb16(s->pb);
275 if (avio_r8(s->pb) == 'S') {
277 avio_read(s->pb, buf, sizeof(buf));
278 m->sofdec = !memcmp(buf, "ofdec", 5);
283 m->sofdec -= !m->sofdec;
285 avio_skip(s->pb, len);
288 if (startcode == PROGRAM_STREAM_MAP) {
289 mpegps_psm_parse(m, s->pb);
293 /* find matching stream */
294 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
295 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
296 (startcode == 0x1bd) || (startcode == 0x1fd)))
299 *ppos = avio_tell(s->pb) - 4;
301 len = avio_rb16(s->pb);
303 dts = AV_NOPTS_VALUE;
310 /* XXX: for mpeg1, should test only bit 7 */
314 if ((c & 0xc0) == 0x40) {
315 /* buffer scale & size */
320 if ((c & 0xe0) == 0x20) {
321 dts = pts = get_pts(s->pb, c);
324 dts = get_pts(s->pb, -1);
327 } else if ((c & 0xc0) == 0x80) {
329 #if 0 /* some streams have this field set for no apparent reason */
330 if ((c & 0x30) != 0) {
331 /* Encrypted multiplex not handled */
335 flags = avio_r8(s->pb);
336 header_len = avio_r8(s->pb);
338 if (header_len > len)
342 dts = pts = get_pts(s->pb, -1);
345 dts = get_pts(s->pb, -1);
349 if (flags & 0x3f && header_len == 0){
351 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
353 if (flags & 0x01) { /* PES extension */
354 pes_ext = avio_r8(s->pb);
356 /* Skip PES private data, program packet sequence counter and P-STD buffer */
357 skip = (pes_ext >> 4) & 0xb;
359 if (pes_ext & 0x40 || skip > header_len){
360 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
363 avio_skip(s->pb, skip);
366 if (pes_ext & 0x01) { /* PES extension 2 */
367 ext2_len = avio_r8(s->pb);
369 if ((ext2_len & 0x7f) > 0) {
370 id_ext = avio_r8(s->pb);
371 if ((id_ext & 0x80) == 0)
372 startcode = ((startcode & 0xff) << 8) | id_ext;
379 avio_skip(s->pb, header_len);
384 if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
385 startcode = avio_r8(s->pb);
387 if (startcode >= 0x80 && startcode <= 0xcf) {
388 /* audio: skip header */
393 if (startcode >= 0xb0 && startcode <= 0xbf) {
394 /* MLP/TrueHD audio has a 4-byte header */
402 if(dts != AV_NOPTS_VALUE && ppos){
404 for(i=0; i<s->nb_streams; i++){
405 if(startcode == s->streams[i]->id &&
406 s->pb->seekable /* index useless on streams anyway */) {
407 ff_reduce_index(s, i);
408 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
413 *pstart_code = startcode;
419 static int mpegps_read_packet(AVFormatContext *s,
422 MpegDemuxContext *m = s->priv_data;
424 int len, startcode, i, es_type;
425 int request_probe= 0;
426 enum CodecID codec_id = CODEC_ID_NONE;
427 enum AVMediaType type;
428 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
429 uint8_t av_uninit(dvdaudio_substream_type);
432 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
436 if(startcode == 0x1bd) {
437 dvdaudio_substream_type = avio_r8(s->pb);
442 /* now find stream */
443 for(i=0;i<s->nb_streams;i++) {
445 if (st->id == startcode)
449 es_type = m->psm_es_type[startcode & 0xff];
450 if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
451 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
452 codec_id = CODEC_ID_MPEG2VIDEO;
453 type = AVMEDIA_TYPE_VIDEO;
454 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
455 codec_id = CODEC_ID_MPEG2VIDEO;
456 type = AVMEDIA_TYPE_VIDEO;
457 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
458 es_type == STREAM_TYPE_AUDIO_MPEG2){
459 codec_id = CODEC_ID_MP3;
460 type = AVMEDIA_TYPE_AUDIO;
461 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
462 codec_id = CODEC_ID_AAC;
463 type = AVMEDIA_TYPE_AUDIO;
464 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
465 codec_id = CODEC_ID_MPEG4;
466 type = AVMEDIA_TYPE_VIDEO;
467 } else if(es_type == STREAM_TYPE_VIDEO_H264){
468 codec_id = CODEC_ID_H264;
469 type = AVMEDIA_TYPE_VIDEO;
470 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
471 codec_id = CODEC_ID_AC3;
472 type = AVMEDIA_TYPE_AUDIO;
476 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
477 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
478 unsigned char buf[8];
479 avio_read(s->pb, buf, 8);
480 avio_seek(s->pb, -8, SEEK_CUR);
481 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
482 codec_id = CODEC_ID_CAVS;
485 type = AVMEDIA_TYPE_VIDEO;
486 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
487 type = AVMEDIA_TYPE_AUDIO;
488 codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
489 } else if (startcode >= 0x80 && startcode <= 0x87) {
490 type = AVMEDIA_TYPE_AUDIO;
491 codec_id = CODEC_ID_AC3;
492 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
493 ||( startcode >= 0x98 && startcode <= 0x9f)) {
494 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
495 type = AVMEDIA_TYPE_AUDIO;
496 codec_id = CODEC_ID_DTS;
497 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
498 type = AVMEDIA_TYPE_AUDIO;
499 /* 16 bit form will be handled as CODEC_ID_PCM_S16BE */
500 codec_id = CODEC_ID_PCM_DVD;
501 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
502 type = AVMEDIA_TYPE_AUDIO;
503 codec_id = CODEC_ID_TRUEHD;
504 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
505 /* Used for both AC-3 and E-AC-3 in EVOB files */
506 type = AVMEDIA_TYPE_AUDIO;
507 codec_id = CODEC_ID_AC3;
508 } else if (startcode >= 0x20 && startcode <= 0x3f) {
509 type = AVMEDIA_TYPE_SUBTITLE;
510 codec_id = CODEC_ID_DVD_SUBTITLE;
511 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
512 type = AVMEDIA_TYPE_VIDEO;
513 codec_id = CODEC_ID_VC1;
514 } else if (startcode == 0x1bd) {
515 // check dvd audio substream type
516 type = AVMEDIA_TYPE_AUDIO;
517 switch(dvdaudio_substream_type & 0xe0) {
518 case 0xa0: codec_id = CODEC_ID_PCM_DVD;
520 case 0x80: if((dvdaudio_substream_type & 0xf8) == 0x88)
521 codec_id = CODEC_ID_DTS;
522 else codec_id = CODEC_ID_AC3;
524 default: av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
530 avio_skip(s->pb, len);
533 /* no stream found: add a new stream */
534 st = av_new_stream(s, startcode);
537 st->codec->codec_type = type;
538 st->codec->codec_id = codec_id;
539 st->request_probe = request_probe;
540 if (codec_id != CODEC_ID_PCM_S16BE)
541 st->need_parsing = AVSTREAM_PARSE_FULL;
543 if(st->discard >= AVDISCARD_ALL)
545 if ((startcode >= 0xa0 && startcode <= 0xaf) ||
546 (startcode == 0x1bd && ((dvdaudio_substream_type & 0xe0) == 0xa0))) {
549 /* for LPCM, we just skip the header and consider it is raw
553 avio_r8(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
554 b1 = avio_r8(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
555 avio_r8(s->pb); /* dynamic range control (0x80 = off) */
557 freq = (b1 >> 4) & 3;
558 st->codec->sample_rate = lpcm_freq_tab[freq];
559 st->codec->channels = 1 + (b1 & 7);
560 st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
561 st->codec->bit_rate = st->codec->channels *
562 st->codec->sample_rate *
563 st->codec->bits_per_coded_sample;
564 if (st->codec->bits_per_coded_sample == 16)
565 st->codec->codec_id = CODEC_ID_PCM_S16BE;
566 else if (st->codec->bits_per_coded_sample == 28)
567 return AVERROR(EINVAL);
569 av_new_packet(pkt, len);
570 avio_read(s->pb, pkt->data, pkt->size);
573 pkt->pos = dummy_pos;
574 pkt->stream_index = st->index;
576 av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
577 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
583 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
584 int64_t *ppos, int64_t pos_limit)
587 int64_t pos, pts, dts;
591 printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);
593 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
594 return AV_NOPTS_VALUE;
597 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
600 printf("none (ret=%d)\n", len);
602 return AV_NOPTS_VALUE;
604 if (startcode == s->streams[stream_index]->id &&
605 dts != AV_NOPTS_VALUE) {
608 avio_skip(s->pb, len);
611 printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
617 AVInputFormat ff_mpegps_demuxer = {
619 NULL_IF_CONFIG_SMALL("MPEG-PS format"),
620 sizeof(MpegDemuxContext),
625 NULL, //mpegps_read_seek,
627 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,