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
30 /*********************************************/
33 #define MAX_SYNC_SIZE 100000
35 static int check_pes(uint8_t *p, uint8_t *end){
37 int pes2= (p[3] & 0xC0) == 0x80
38 && (p[4] & 0xC0) != 0x40
39 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
41 for(p+=3; p<end && *p == 0xFF; p++);
42 if((*p&0xC0) == 0x40) p+=2;
43 if((*p&0xF0) == 0x20){
44 pes1= p[0]&p[2]&p[4]&1;
45 }else if((*p&0xF0) == 0x30){
46 pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
53 static int mpegps_probe(AVProbeData *p)
56 int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
60 for(i=0; i<p->buf_size; i++){
61 code = (code<<8) + p->buf[i];
62 if ((code & 0xffffff00) == 0x100) {
63 int pes= check_pes(p->buf+i, p->buf+p->buf_size);
65 if(code == SYSTEM_HEADER_START_CODE) sys++;
66 else if(code == PRIVATE_STREAM_1) priv1++;
67 else if(code == PACK_START_CODE) pspack++;
68 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
69 else if((code & 0xe0) == AUDIO_ID && pes) audio++;
71 else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
72 else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
76 if(vid+audio > invalid) /* invalid VDR files nd short PES streams */
77 score= AVPROBE_SCORE_MAX/4;
79 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, invalid, p->buf_size);
80 if(sys>invalid && sys*9 <= pspack*10)
81 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
82 if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
83 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
84 if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
85 return (audio > 12 || vid > 3) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
87 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
88 //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
93 typedef struct MpegDemuxContext {
95 unsigned char psm_es_type[256];
99 static int mpegps_read_header(AVFormatContext *s,
100 AVFormatParameters *ap)
102 MpegDemuxContext *m = s->priv_data;
103 const char *sofdec = "Sofdec";
106 m->header_state = 0xff;
107 s->ctx_flags |= AVFMTCTX_NOHEADER;
112 m->header_state = m->header_state << 8 | v;
114 } while (v == sofdec[i] && i++ < 6);
116 m->sofdec = (m->sofdec == 6) ? 1 : 0;
118 /* no need to do more */
122 static int64_t get_pts(ByteIOContext *pb, int c)
126 buf[0] = c<0 ? get_byte(pb) : c;
127 get_buffer(pb, buf+1, 4);
129 return ff_parse_pes_pts(buf);
132 static int find_next_start_code(ByteIOContext *pb, int *size_ptr,
133 int32_t *header_state)
135 unsigned int state, v;
138 state = *header_state;
145 if (state == 0x000001) {
146 state = ((state << 8) | v) & 0xffffff;
150 state = ((state << 8) | v) & 0xffffff;
154 *header_state = state;
159 #if 0 /* unused, remove? */
161 static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)
163 int64_t pos, pos_start;
164 int max_size, start_code;
166 max_size = *size_ptr;
167 pos_start = url_ftell(pb);
169 /* in order to go faster, we fill the buffer */
170 pos = pos_start - 16386;
173 url_fseek(pb, pos, SEEK_SET);
179 if (pos < 0 || (pos_start - pos) >= max_size) {
183 url_fseek(pb, pos, SEEK_SET);
184 start_code = get_be32(pb);
185 if ((start_code & 0xffffff00) == 0x100)
189 *size_ptr = pos_start - pos;
195 * Extracts stream types from a program stream map
196 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
198 * @return number of bytes occupied by PSM in the bitstream
200 static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)
202 int psm_length, ps_info_length, es_map_length;
204 psm_length = get_be16(pb);
207 ps_info_length = get_be16(pb);
209 /* skip program_stream_info */
210 url_fskip(pb, ps_info_length);
211 es_map_length = get_be16(pb);
213 /* at least one es available? */
214 while (es_map_length >= 4){
215 unsigned char type = get_byte(pb);
216 unsigned char es_id = get_byte(pb);
217 uint16_t es_info_length = get_be16(pb);
218 /* remember mapping from stream id to stream type */
219 m->psm_es_type[es_id] = type;
220 /* skip program_stream_info */
221 url_fskip(pb, es_info_length);
222 es_map_length -= 4 + es_info_length;
224 get_be32(pb); /* crc32 */
225 return 2 + psm_length;
228 /* read the next PES header. Return its position in ppos
229 (if not NULL), and its start code, pts and dts.
231 static int mpegps_read_pes_header(AVFormatContext *s,
232 int64_t *ppos, int *pstart_code,
233 int64_t *ppts, int64_t *pdts)
235 MpegDemuxContext *m = s->priv_data;
236 int len, size, startcode, c, flags, header_len;
237 int pes_ext, ext2_len, id_ext, skip;
239 int64_t last_sync= url_ftell(s->pb);
242 url_fseek(s->pb, last_sync, SEEK_SET);
244 /* next start code (should be immediately after) */
245 m->header_state = 0xff;
246 size = MAX_SYNC_SIZE;
247 startcode = find_next_start_code(s->pb, &size, &m->header_state);
248 last_sync = url_ftell(s->pb);
249 //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, url_ftell(s->pb));
253 //FIXME we should remember header_state
254 return AVERROR(EAGAIN);
257 if (startcode == PACK_START_CODE)
259 if (startcode == SYSTEM_HEADER_START_CODE)
261 if (startcode == PADDING_STREAM) {
262 url_fskip(s->pb, get_be16(s->pb));
265 if (startcode == PRIVATE_STREAM_2) {
266 len = get_be16(s->pb);
269 if (get_byte(s->pb) == 'S') {
271 get_buffer(s->pb, buf, sizeof(buf));
272 m->sofdec = !memcmp(buf, "ofdec", 5);
277 m->sofdec -= !m->sofdec;
279 url_fskip(s->pb, len);
282 if (startcode == PROGRAM_STREAM_MAP) {
283 mpegps_psm_parse(m, s->pb);
287 /* find matching stream */
288 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
289 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
290 (startcode == 0x1bd) || (startcode == 0x1fd)))
293 *ppos = url_ftell(s->pb) - 4;
295 len = get_be16(s->pb);
297 dts = AV_NOPTS_VALUE;
304 /* XXX: for mpeg1, should test only bit 7 */
308 if ((c & 0xc0) == 0x40) {
309 /* buffer scale & size */
314 if ((c & 0xe0) == 0x20) {
315 dts = pts = get_pts(s->pb, c);
318 dts = get_pts(s->pb, -1);
321 } else if ((c & 0xc0) == 0x80) {
323 #if 0 /* some streams have this field set for no apparent reason */
324 if ((c & 0x30) != 0) {
325 /* Encrypted multiplex not handled */
329 flags = get_byte(s->pb);
330 header_len = get_byte(s->pb);
332 if (header_len > len)
336 dts = pts = get_pts(s->pb, -1);
339 dts = get_pts(s->pb, -1);
343 if (flags & 0x3f && header_len == 0){
345 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
347 if (flags & 0x01) { /* PES extension */
348 pes_ext = get_byte(s->pb);
350 /* Skip PES private data, program packet sequence counter and P-STD buffer */
351 skip = (pes_ext >> 4) & 0xb;
353 if (pes_ext & 0x40 || skip > header_len){
354 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
357 url_fskip(s->pb, skip);
360 if (pes_ext & 0x01) { /* PES extension 2 */
361 ext2_len = get_byte(s->pb);
363 if ((ext2_len & 0x7f) > 0) {
364 id_ext = get_byte(s->pb);
365 if ((id_ext & 0x80) == 0)
366 startcode = ((startcode & 0xff) << 8) | id_ext;
373 url_fskip(s->pb, header_len);
378 if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
379 startcode = get_byte(s->pb);
381 if (startcode >= 0x80 && startcode <= 0xcf) {
382 /* audio: skip header */
387 if (startcode >= 0xb0 && startcode <= 0xbf) {
388 /* MLP/TrueHD audio has a 4-byte header */
396 if(dts != AV_NOPTS_VALUE && ppos){
398 for(i=0; i<s->nb_streams; i++){
399 if(startcode == s->streams[i]->id &&
400 !url_is_streamed(s->pb) /* index useless on streams anyway */) {
401 ff_reduce_index(s, i);
402 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
407 *pstart_code = startcode;
413 static int mpegps_read_packet(AVFormatContext *s,
416 MpegDemuxContext *m = s->priv_data;
418 int len, startcode, i, es_type;
419 enum CodecID codec_id = CODEC_ID_NONE;
421 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
422 uint8_t av_uninit(dvdaudio_substream_type);
425 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
429 if(startcode == 0x1bd) {
430 dvdaudio_substream_type = get_byte(s->pb);
435 /* now find stream */
436 for(i=0;i<s->nb_streams;i++) {
438 if (st->id == startcode)
442 es_type = m->psm_es_type[startcode & 0xff];
443 if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
444 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
445 codec_id = CODEC_ID_MPEG2VIDEO;
446 type = CODEC_TYPE_VIDEO;
447 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
448 codec_id = CODEC_ID_MPEG2VIDEO;
449 type = CODEC_TYPE_VIDEO;
450 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
451 es_type == STREAM_TYPE_AUDIO_MPEG2){
452 codec_id = CODEC_ID_MP3;
453 type = CODEC_TYPE_AUDIO;
454 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
455 codec_id = CODEC_ID_AAC;
456 type = CODEC_TYPE_AUDIO;
457 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
458 codec_id = CODEC_ID_MPEG4;
459 type = CODEC_TYPE_VIDEO;
460 } else if(es_type == STREAM_TYPE_VIDEO_H264){
461 codec_id = CODEC_ID_H264;
462 type = CODEC_TYPE_VIDEO;
463 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
464 codec_id = CODEC_ID_AC3;
465 type = CODEC_TYPE_AUDIO;
469 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
470 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
471 unsigned char buf[8];
472 get_buffer(s->pb, buf, 8);
473 url_fseek(s->pb, -8, SEEK_CUR);
474 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
475 codec_id = CODEC_ID_CAVS;
477 codec_id = CODEC_ID_PROBE;
478 type = CODEC_TYPE_VIDEO;
479 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
480 type = CODEC_TYPE_AUDIO;
481 codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
482 } else if (startcode >= 0x80 && startcode <= 0x87) {
483 type = CODEC_TYPE_AUDIO;
484 codec_id = CODEC_ID_AC3;
485 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
486 ||( startcode >= 0x98 && startcode <= 0x9f)) {
487 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
488 type = CODEC_TYPE_AUDIO;
489 codec_id = CODEC_ID_DTS;
490 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
491 type = CODEC_TYPE_AUDIO;
492 /* 16 bit form will be handled as CODEC_ID_PCM_S16BE */
493 codec_id = CODEC_ID_PCM_DVD;
494 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
495 type = CODEC_TYPE_AUDIO;
496 codec_id = CODEC_ID_TRUEHD;
497 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
498 /* Used for both AC-3 and E-AC-3 in EVOB files */
499 type = CODEC_TYPE_AUDIO;
500 codec_id = CODEC_ID_AC3;
501 } else if (startcode >= 0x20 && startcode <= 0x3f) {
502 type = CODEC_TYPE_SUBTITLE;
503 codec_id = CODEC_ID_DVD_SUBTITLE;
504 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
505 type = CODEC_TYPE_VIDEO;
506 codec_id = CODEC_ID_VC1;
507 } else if (startcode == 0x1bd) {
508 // check dvd audio substream type
509 type = CODEC_TYPE_AUDIO;
510 switch(dvdaudio_substream_type & 0xe0) {
511 case 0xa0: codec_id = CODEC_ID_PCM_DVD;
513 case 0x80: if((dvdaudio_substream_type & 0xf8) == 0x88)
514 codec_id = CODEC_ID_DTS;
515 else codec_id = CODEC_ID_AC3;
517 default: av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
523 url_fskip(s->pb, len);
526 /* no stream found: add a new stream */
527 st = av_new_stream(s, startcode);
530 st->codec->codec_type = type;
531 st->codec->codec_id = codec_id;
532 if (codec_id != CODEC_ID_PCM_S16BE)
533 st->need_parsing = AVSTREAM_PARSE_FULL;
535 if(st->discard >= AVDISCARD_ALL)
537 if ((startcode >= 0xa0 && startcode <= 0xaf) ||
538 (startcode == 0x1bd && ((dvdaudio_substream_type & 0xe0) == 0xa0))) {
541 /* for LPCM, we just skip the header and consider it is raw
545 get_byte(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
546 b1 = get_byte(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
547 get_byte(s->pb); /* dynamic range control (0x80 = off) */
549 freq = (b1 >> 4) & 3;
550 st->codec->sample_rate = lpcm_freq_tab[freq];
551 st->codec->channels = 1 + (b1 & 7);
552 st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
553 st->codec->bit_rate = st->codec->channels *
554 st->codec->sample_rate *
555 st->codec->bits_per_coded_sample;
556 if (st->codec->bits_per_coded_sample == 16)
557 st->codec->codec_id = CODEC_ID_PCM_S16BE;
558 else if (st->codec->bits_per_coded_sample == 28)
559 return AVERROR(EINVAL);
561 av_new_packet(pkt, len);
562 get_buffer(s->pb, pkt->data, pkt->size);
565 pkt->pos = dummy_pos;
566 pkt->stream_index = st->index;
568 av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
569 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
575 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
576 int64_t *ppos, int64_t pos_limit)
579 int64_t pos, pts, dts;
583 printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);
585 if (url_fseek(s->pb, pos, SEEK_SET) < 0)
586 return AV_NOPTS_VALUE;
589 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
592 printf("none (ret=%d)\n", len);
594 return AV_NOPTS_VALUE;
596 if (startcode == s->streams[stream_index]->id &&
597 dts != AV_NOPTS_VALUE) {
600 url_fskip(s->pb, len);
603 printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
609 AVInputFormat mpegps_demuxer = {
611 NULL_IF_CONFIG_SMALL("MPEG-PS format"),
612 sizeof(MpegDemuxContext),
617 NULL, //mpegps_read_seek,
619 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,