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 if(sys>invalid && sys*9 <= pspack*10)
89 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
90 if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
91 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
92 if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
93 return (audio > 12 || vid > 3 + 2*invalid) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
95 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
96 //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
97 //Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
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;
171 * Extract stream types from a program stream map
172 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
174 * @return number of bytes occupied by PSM in the bitstream
176 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
178 int psm_length, ps_info_length, es_map_length;
180 psm_length = avio_rb16(pb);
183 ps_info_length = avio_rb16(pb);
185 /* skip program_stream_info */
186 avio_skip(pb, ps_info_length);
187 es_map_length = avio_rb16(pb);
189 /* at least one es available? */
190 while (es_map_length >= 4){
191 unsigned char type = avio_r8(pb);
192 unsigned char es_id = avio_r8(pb);
193 uint16_t es_info_length = avio_rb16(pb);
194 /* remember mapping from stream id to stream type */
195 m->psm_es_type[es_id] = type;
196 /* skip program_stream_info */
197 avio_skip(pb, es_info_length);
198 es_map_length -= 4 + es_info_length;
200 avio_rb32(pb); /* crc32 */
201 return 2 + psm_length;
204 /* read the next PES header. Return its position in ppos
205 (if not NULL), and its start code, pts and dts.
207 static int mpegps_read_pes_header(AVFormatContext *s,
208 int64_t *ppos, int *pstart_code,
209 int64_t *ppts, int64_t *pdts)
211 MpegDemuxContext *m = s->priv_data;
212 int len, size, startcode, c, flags, header_len;
213 int pes_ext, ext2_len, id_ext, skip;
215 int64_t last_sync= avio_tell(s->pb);
218 avio_seek(s->pb, last_sync, SEEK_SET);
220 /* next start code (should be immediately after) */
221 m->header_state = 0xff;
222 size = MAX_SYNC_SIZE;
223 startcode = find_next_start_code(s->pb, &size, &m->header_state);
224 last_sync = avio_tell(s->pb);
228 //FIXME we should remember header_state
229 return AVERROR(EAGAIN);
232 if (startcode == PACK_START_CODE)
234 if (startcode == SYSTEM_HEADER_START_CODE)
236 if (startcode == PADDING_STREAM) {
237 avio_skip(s->pb, avio_rb16(s->pb));
240 if (startcode == PRIVATE_STREAM_2) {
241 len = avio_rb16(s->pb);
244 if (avio_r8(s->pb) == 'S') {
246 avio_read(s->pb, buf, sizeof(buf));
247 m->sofdec = !memcmp(buf, "ofdec", 5);
252 m->sofdec -= !m->sofdec;
254 avio_skip(s->pb, len);
257 if (startcode == PROGRAM_STREAM_MAP) {
258 mpegps_psm_parse(m, s->pb);
262 /* find matching stream */
263 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
264 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
265 (startcode == 0x1bd) || (startcode == 0x1fd)))
268 *ppos = avio_tell(s->pb) - 4;
270 len = avio_rb16(s->pb);
272 dts = AV_NOPTS_VALUE;
279 /* XXX: for mpeg1, should test only bit 7 */
283 if ((c & 0xc0) == 0x40) {
284 /* buffer scale & size */
289 if ((c & 0xe0) == 0x20) {
290 dts = pts = get_pts(s->pb, c);
293 dts = get_pts(s->pb, -1);
296 } else if ((c & 0xc0) == 0x80) {
298 flags = avio_r8(s->pb);
299 header_len = avio_r8(s->pb);
301 if (header_len > len)
305 dts = pts = get_pts(s->pb, -1);
308 dts = get_pts(s->pb, -1);
312 if (flags & 0x3f && header_len == 0){
314 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
316 if (flags & 0x01) { /* PES extension */
317 pes_ext = avio_r8(s->pb);
319 /* Skip PES private data, program packet sequence counter and P-STD buffer */
320 skip = (pes_ext >> 4) & 0xb;
322 if (pes_ext & 0x40 || skip > header_len){
323 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
326 avio_skip(s->pb, skip);
329 if (pes_ext & 0x01) { /* PES extension 2 */
330 ext2_len = avio_r8(s->pb);
332 if ((ext2_len & 0x7f) > 0) {
333 id_ext = avio_r8(s->pb);
334 if ((id_ext & 0x80) == 0)
335 startcode = ((startcode & 0xff) << 8) | id_ext;
342 avio_skip(s->pb, header_len);
347 if (startcode == PRIVATE_STREAM_1) {
348 startcode = avio_r8(s->pb);
353 if(dts != AV_NOPTS_VALUE && ppos){
355 for(i=0; i<s->nb_streams; i++){
356 if(startcode == s->streams[i]->id &&
357 s->pb->seekable /* index useless on streams anyway */) {
358 ff_reduce_index(s, i);
359 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
364 *pstart_code = startcode;
370 static int mpegps_read_packet(AVFormatContext *s,
373 MpegDemuxContext *m = s->priv_data;
375 int len, startcode, i, es_type, ret;
377 int request_probe= 0;
378 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
379 enum AVMediaType type;
380 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
383 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
387 if (startcode >= 0x80 && startcode <= 0xcf) {
391 /* audio: skip header */
393 lpcm_header_len = avio_rb16(s->pb);
395 if (startcode >= 0xb0 && startcode <= 0xbf) {
396 /* MLP/TrueHD audio has a 4-byte header */
402 /* now find stream */
403 for(i=0;i<s->nb_streams;i++) {
405 if (st->id == startcode)
409 es_type = m->psm_es_type[startcode & 0xff];
410 if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
411 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
412 codec_id = AV_CODEC_ID_MPEG2VIDEO;
413 type = AVMEDIA_TYPE_VIDEO;
414 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
415 codec_id = AV_CODEC_ID_MPEG2VIDEO;
416 type = AVMEDIA_TYPE_VIDEO;
417 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
418 es_type == STREAM_TYPE_AUDIO_MPEG2){
419 codec_id = AV_CODEC_ID_MP3;
420 type = AVMEDIA_TYPE_AUDIO;
421 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
422 codec_id = AV_CODEC_ID_AAC;
423 type = AVMEDIA_TYPE_AUDIO;
424 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
425 codec_id = AV_CODEC_ID_MPEG4;
426 type = AVMEDIA_TYPE_VIDEO;
427 } else if(es_type == STREAM_TYPE_VIDEO_H264){
428 codec_id = AV_CODEC_ID_H264;
429 type = AVMEDIA_TYPE_VIDEO;
430 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
431 codec_id = AV_CODEC_ID_AC3;
432 type = AVMEDIA_TYPE_AUDIO;
436 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
437 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
438 unsigned char buf[8];
439 avio_read(s->pb, buf, 8);
440 avio_seek(s->pb, -8, SEEK_CUR);
441 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
442 codec_id = AV_CODEC_ID_CAVS;
445 type = AVMEDIA_TYPE_VIDEO;
446 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
447 type = AVMEDIA_TYPE_AUDIO;
448 codec_id = m->sofdec > 0 ? AV_CODEC_ID_ADPCM_ADX : AV_CODEC_ID_MP2;
449 } else if (startcode >= 0x80 && startcode <= 0x87) {
450 type = AVMEDIA_TYPE_AUDIO;
451 codec_id = AV_CODEC_ID_AC3;
452 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
453 ||( startcode >= 0x98 && startcode <= 0x9f)) {
454 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
455 type = AVMEDIA_TYPE_AUDIO;
456 codec_id = AV_CODEC_ID_DTS;
457 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
458 type = AVMEDIA_TYPE_AUDIO;
459 if(lpcm_header_len == 6) {
460 codec_id = AV_CODEC_ID_MLP;
462 /* 16 bit form will be handled as AV_CODEC_ID_PCM_S16BE */
463 codec_id = AV_CODEC_ID_PCM_DVD;
465 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
466 type = AVMEDIA_TYPE_AUDIO;
467 codec_id = AV_CODEC_ID_TRUEHD;
468 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
469 /* Used for both AC-3 and E-AC-3 in EVOB files */
470 type = AVMEDIA_TYPE_AUDIO;
471 codec_id = AV_CODEC_ID_AC3;
472 } else if (startcode >= 0x20 && startcode <= 0x3f) {
473 type = AVMEDIA_TYPE_SUBTITLE;
474 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
475 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
476 type = AVMEDIA_TYPE_VIDEO;
477 codec_id = AV_CODEC_ID_VC1;
481 avio_skip(s->pb, len);
484 /* no stream found: add a new stream */
485 st = avformat_new_stream(s, NULL);
489 st->codec->codec_type = type;
490 st->codec->codec_id = codec_id;
491 st->request_probe = request_probe;
492 if (codec_id != AV_CODEC_ID_PCM_S16BE)
493 st->need_parsing = AVSTREAM_PARSE_FULL;
495 if(st->discard >= AVDISCARD_ALL)
497 if (startcode >= 0xa0 && startcode <= 0xaf) {
498 if (lpcm_header_len == 6) {
506 /* for LPCM, we just skip the header and consider it is raw
510 avio_r8(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
511 b1 = avio_r8(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
512 avio_r8(s->pb); /* dynamic range control (0x80 = off) */
514 freq = (b1 >> 4) & 3;
515 st->codec->sample_rate = lpcm_freq_tab[freq];
516 st->codec->channels = 1 + (b1 & 7);
517 st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
518 st->codec->bit_rate = st->codec->channels *
519 st->codec->sample_rate *
520 st->codec->bits_per_coded_sample;
521 if (st->codec->bits_per_coded_sample == 16)
522 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
523 else if (st->codec->bits_per_coded_sample == 28)
524 return AVERROR(EINVAL);
527 ret = av_get_packet(s->pb, pkt, len);
530 pkt->pos = dummy_pos;
531 pkt->stream_index = st->index;
532 av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
533 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
536 return (ret < 0) ? ret : 0;
539 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
540 int64_t *ppos, int64_t pos_limit)
543 int64_t pos, pts, dts;
546 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
547 return AV_NOPTS_VALUE;
550 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
552 av_dlog(s, "none (ret=%d)\n", len);
553 return AV_NOPTS_VALUE;
555 if (startcode == s->streams[stream_index]->id &&
556 dts != AV_NOPTS_VALUE) {
559 avio_skip(s->pb, len);
561 av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
562 pos, dts, dts / 90000.0);
567 AVInputFormat ff_mpegps_demuxer = {
569 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
570 .priv_data_size = sizeof(MpegDemuxContext),
571 .read_probe = mpegps_probe,
572 .read_header = mpegps_read_header,
573 .read_packet = mpegps_read_packet,
574 .read_timestamp = mpegps_read_dts,
575 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,