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 cdxa_probe(AVProbeData *p)
37 /* check file header */
38 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
39 p->buf[2] == 'F' && p->buf[3] == 'F' &&
40 p->buf[8] == 'C' && p->buf[9] == 'D' &&
41 p->buf[10] == 'X' && p->buf[11] == 'A')
42 return AVPROBE_SCORE_MAX;
47 static int check_pes(uint8_t *p, uint8_t *end){
49 int pes2= (p[3] & 0xC0) == 0x80
50 && (p[4] & 0xC0) != 0x40
51 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
53 for(p+=3; p<end && *p == 0xFF; p++);
54 if((*p&0xC0) == 0x40) p+=2;
55 if((*p&0xF0) == 0x20){
56 pes1= p[0]&p[2]&p[4]&1;
58 }else if((*p&0xF0) == 0x30){
59 pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
67 static int mpegps_probe(AVProbeData *p)
70 int sys=0, pspack=0, priv1=0, vid=0, audio=0;
74 score = cdxa_probe(p);
75 if (score > 0) return score;
77 /* Search for MPEG stream */
78 for(i=0; i<p->buf_size; i++){
79 code = (code<<8) + p->buf[i];
80 if ((code & 0xffffff00) == 0x100) {
81 int pes= check_pes(p->buf+i, p->buf+p->buf_size);
83 if(code == SYSTEM_HEADER_START_CODE) sys++;
84 else if(code == PRIVATE_STREAM_1) priv1++;
85 else if(code == PACK_START_CODE) pspack++;
86 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
87 else if((code & 0xe0) == AUDIO_ID && pes) audio++;
91 if(vid || audio) /* invalid VDR files nd short PES streams */
92 score= AVPROBE_SCORE_MAX/4;
94 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, p->buf_size);
95 if(sys && sys*9 <= pspack*10)
96 return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
97 if((priv1 || vid || audio) && (priv1+vid+audio)*9 <= pspack*10)
98 return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
99 if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack && p->buf_size>2048) /* PES stream */
100 return AVPROBE_SCORE_MAX/2+2;
102 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
107 typedef struct MpegDemuxContext {
108 int32_t header_state;
109 unsigned char psm_es_type[256];
113 static int mpegps_read_header(AVFormatContext *s,
114 AVFormatParameters *ap)
116 MpegDemuxContext *m = s->priv_data;
117 uint8_t buffer[8192];
120 m->header_state = 0xff;
121 s->ctx_flags |= AVFMTCTX_NOHEADER;
123 get_buffer(&s->pb, buffer, sizeof(buffer));
124 if ((p=memchr(buffer, 'S', sizeof(buffer)-5)))
125 if (!memcmp(p, "Sofdec", 6))
127 url_fseek(&s->pb, -(offset_t)sizeof(buffer), SEEK_CUR);
129 /* no need to do more */
133 static int64_t get_pts(ByteIOContext *pb, int c)
140 pts = (int64_t)((c >> 1) & 0x07) << 30;
142 pts |= (int64_t)(val >> 1) << 15;
144 pts |= (int64_t)(val >> 1);
148 static int find_next_start_code(ByteIOContext *pb, int *size_ptr,
149 int32_t *header_state)
151 unsigned int state, v;
154 state = *header_state;
161 if (state == 0x000001) {
162 state = ((state << 8) | v) & 0xffffff;
166 state = ((state << 8) | v) & 0xffffff;
170 *header_state = state;
175 #if 0 /* unused, remove? */
177 static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)
179 int64_t pos, pos_start;
180 int max_size, start_code;
182 max_size = *size_ptr;
183 pos_start = url_ftell(pb);
185 /* in order to go faster, we fill the buffer */
186 pos = pos_start - 16386;
189 url_fseek(pb, pos, SEEK_SET);
195 if (pos < 0 || (pos_start - pos) >= max_size) {
199 url_fseek(pb, pos, SEEK_SET);
200 start_code = get_be32(pb);
201 if ((start_code & 0xffffff00) == 0x100)
205 *size_ptr = pos_start - pos;
211 * Extracts stream types from a program stream map
212 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
214 * @return number of bytes occupied by PSM in the bitstream
216 static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)
218 int psm_length, ps_info_length, es_map_length;
220 psm_length = get_be16(pb);
223 ps_info_length = get_be16(pb);
225 /* skip program_stream_info */
226 url_fskip(pb, ps_info_length);
227 es_map_length = get_be16(pb);
229 /* at least one es available? */
230 while (es_map_length >= 4){
231 unsigned char type = get_byte(pb);
232 unsigned char es_id = get_byte(pb);
233 uint16_t es_info_length = get_be16(pb);
234 /* remember mapping from stream id to stream type */
235 m->psm_es_type[es_id] = type;
236 /* skip program_stream_info */
237 url_fskip(pb, es_info_length);
238 es_map_length -= 4 + es_info_length;
240 get_be32(pb); /* crc32 */
241 return 2 + psm_length;
244 /* read the next PES header. Return its position in ppos
245 (if not NULL), and its start code, pts and dts.
247 static int mpegps_read_pes_header(AVFormatContext *s,
248 int64_t *ppos, int *pstart_code,
249 int64_t *ppts, int64_t *pdts)
251 MpegDemuxContext *m = s->priv_data;
252 int len, size, startcode, c, flags, header_len;
253 int pes_ext, ext2_len, id_ext, skip;
255 int64_t last_sync= url_ftell(&s->pb);
258 url_fseek(&s->pb, last_sync, SEEK_SET);
260 /* next start code (should be immediately after) */
261 m->header_state = 0xff;
262 size = MAX_SYNC_SIZE;
263 startcode = find_next_start_code(&s->pb, &size, &m->header_state);
264 last_sync = url_ftell(&s->pb);
265 //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, url_ftell(&s->pb));
268 if (startcode == PACK_START_CODE)
270 if (startcode == SYSTEM_HEADER_START_CODE)
272 if (startcode == PADDING_STREAM ||
273 startcode == PRIVATE_STREAM_2) {
275 len = get_be16(&s->pb);
276 url_fskip(&s->pb, len);
279 if (startcode == PROGRAM_STREAM_MAP) {
280 mpegps_psm_parse(m, &s->pb);
284 /* find matching stream */
285 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
286 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
287 (startcode == 0x1bd) || (startcode == 0x1fd)))
290 *ppos = url_ftell(&s->pb) - 4;
292 len = get_be16(&s->pb);
294 dts = AV_NOPTS_VALUE;
299 c = get_byte(&s->pb);
301 /* XXX: for mpeg1, should test only bit 7 */
305 if ((c & 0xc0) == 0x40) {
306 /* buffer scale & size */
308 c = get_byte(&s->pb);
311 if ((c & 0xe0) == 0x20) {
312 dts = pts = get_pts(&s->pb, c);
315 dts = get_pts(&s->pb, -1);
318 } else if ((c & 0xc0) == 0x80) {
320 #if 0 /* some streams have this field set for no apparent reason */
321 if ((c & 0x30) != 0) {
322 /* Encrypted multiplex not handled */
326 flags = get_byte(&s->pb);
327 header_len = get_byte(&s->pb);
329 if (header_len > len)
333 dts = pts = get_pts(&s->pb, -1);
336 dts = get_pts(&s->pb, -1);
340 if (flags & 0x01) { /* PES extension */
341 pes_ext = get_byte(&s->pb);
343 if (pes_ext & 0x40) { /* pack header - should be zero in PS */
346 /* Skip PES private data, program packet sequence counter and P-STD buffer */
347 skip = (pes_ext >> 4) & 0xb;
349 url_fskip(&s->pb, skip);
352 if (pes_ext & 0x01) { /* PES extension 2 */
353 ext2_len = get_byte(&s->pb);
355 if ((ext2_len & 0x7f) > 0) {
356 id_ext = get_byte(&s->pb);
357 if ((id_ext & 0x80) == 0)
358 startcode = ((startcode & 0xff) << 8) | id_ext;
365 url_fskip(&s->pb, header_len);
370 if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
371 startcode = get_byte(&s->pb);
373 if (startcode >= 0x80 && startcode <= 0xcf) {
374 /* audio: skip header */
379 if (startcode >= 0xb0 && startcode <= 0xbf) {
380 /* MLP/TrueHD audio has a 4-byte header */
388 if(dts != AV_NOPTS_VALUE && ppos){
390 for(i=0; i<s->nb_streams; i++){
391 if(startcode == s->streams[i]->id) {
392 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
397 *pstart_code = startcode;
403 static int mpegps_read_packet(AVFormatContext *s,
406 MpegDemuxContext *m = s->priv_data;
408 int len, startcode, i, type, codec_id = 0, es_type;
409 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
412 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
416 /* now find stream */
417 for(i=0;i<s->nb_streams;i++) {
419 if (st->id == startcode)
423 es_type = m->psm_es_type[startcode & 0xff];
425 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
426 codec_id = CODEC_ID_MPEG2VIDEO;
427 type = CODEC_TYPE_VIDEO;
428 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
429 codec_id = CODEC_ID_MPEG2VIDEO;
430 type = CODEC_TYPE_VIDEO;
431 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
432 es_type == STREAM_TYPE_AUDIO_MPEG2){
433 codec_id = CODEC_ID_MP3;
434 type = CODEC_TYPE_AUDIO;
435 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
436 codec_id = CODEC_ID_AAC;
437 type = CODEC_TYPE_AUDIO;
438 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
439 codec_id = CODEC_ID_MPEG4;
440 type = CODEC_TYPE_VIDEO;
441 } else if(es_type == STREAM_TYPE_VIDEO_H264){
442 codec_id = CODEC_ID_H264;
443 type = CODEC_TYPE_VIDEO;
444 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
445 codec_id = CODEC_ID_AC3;
446 type = CODEC_TYPE_AUDIO;
450 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
451 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
452 unsigned char buf[8];
453 get_buffer(&s->pb, buf, 8);
454 url_fseek(&s->pb, -8, SEEK_CUR);
455 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
456 codec_id = CODEC_ID_CAVS;
458 codec_id = CODEC_ID_MPEG2VIDEO;
459 type = CODEC_TYPE_VIDEO;
460 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
461 type = CODEC_TYPE_AUDIO;
462 codec_id = m->sofdec ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
463 } else if (startcode >= 0x80 && startcode <= 0x87) {
464 type = CODEC_TYPE_AUDIO;
465 codec_id = CODEC_ID_AC3;
466 } else if ((startcode >= 0x88 && startcode <= 0x8f)
467 ||( startcode >= 0x98 && startcode <= 0x9f)) {
468 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
469 type = CODEC_TYPE_AUDIO;
470 codec_id = CODEC_ID_DTS;
471 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
472 type = CODEC_TYPE_AUDIO;
473 codec_id = CODEC_ID_PCM_S16BE;
474 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
475 type = CODEC_TYPE_AUDIO;
476 codec_id = CODEC_ID_MLP;
477 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
478 /* Used for both AC-3 and E-AC-3 in EVOB files */
479 type = CODEC_TYPE_AUDIO;
480 codec_id = CODEC_ID_AC3;
481 } else if (startcode >= 0x20 && startcode <= 0x3f) {
482 type = CODEC_TYPE_SUBTITLE;
483 codec_id = CODEC_ID_DVD_SUBTITLE;
484 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
485 type = CODEC_TYPE_VIDEO;
486 codec_id = CODEC_ID_VC1;
490 url_fskip(&s->pb, len);
493 /* no stream found: add a new stream */
494 st = av_new_stream(s, startcode);
497 st->codec->codec_type = type;
498 st->codec->codec_id = codec_id;
499 if (codec_id != CODEC_ID_PCM_S16BE)
500 st->need_parsing = AVSTREAM_PARSE_FULL;
502 if(st->discard >= AVDISCARD_ALL)
504 if (startcode >= 0xa0 && startcode <= 0xaf) {
507 /* for LPCM, we just skip the header and consider it is raw
511 get_byte(&s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
512 b1 = get_byte(&s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
513 get_byte(&s->pb); /* dynamic range control (0x80 = off) */
515 freq = (b1 >> 4) & 3;
516 st->codec->sample_rate = lpcm_freq_tab[freq];
517 st->codec->channels = 1 + (b1 & 7);
518 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 2;
520 av_new_packet(pkt, len);
521 get_buffer(&s->pb, pkt->data, pkt->size);
524 pkt->stream_index = st->index;
526 av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
527 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
533 static int mpegps_read_close(AVFormatContext *s)
538 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
539 int64_t *ppos, int64_t pos_limit)
542 int64_t pos, pts, dts;
546 printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);
548 url_fseek(&s->pb, pos, SEEK_SET);
550 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
553 printf("none (ret=%d)\n", len);
555 return AV_NOPTS_VALUE;
557 if (startcode == s->streams[stream_index]->id &&
558 dts != AV_NOPTS_VALUE) {
561 url_fskip(&s->pb, len);
564 printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
570 AVInputFormat mpegps_demuxer = {
573 sizeof(MpegDemuxContext),
578 NULL, //mpegps_read_seek,
580 .flags = AVFMT_SHOW_IDS,