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;
46 }else if((*p&0xF0) == 0x30){
47 pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
55 static int mpegps_probe(AVProbeData *p)
58 int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
62 for(i=0; i<p->buf_size; i++){
63 code = (code<<8) + p->buf[i];
64 if ((code & 0xffffff00) == 0x100) {
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 == PRIVATE_STREAM_1) priv1++;
69 else if(code == PACK_START_CODE) pspack++;
70 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
71 else if((code & 0xe0) == AUDIO_ID && pes) audio++;
73 else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
74 else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
78 if(vid+audio > invalid) /* invalid VDR files nd short PES streams */
79 score= AVPROBE_SCORE_MAX/4;
81 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, p->buf_size);
82 if(sys>invalid && sys*9 <= pspack*10)
83 return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
84 if(priv1 + vid + audio > invalid && (priv1+vid+audio)*9 <= pspack*10)
85 return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
86 if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack && p->buf_size>2048) /* PES stream */
87 return AVPROBE_SCORE_MAX/2+2;
89 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
94 typedef struct MpegDemuxContext {
96 unsigned char psm_es_type[256];
100 static int mpegps_read_header(AVFormatContext *s,
101 AVFormatParameters *ap)
103 MpegDemuxContext *m = s->priv_data;
104 const char *sofdec = "Sofdec";
107 m->header_state = 0xff;
108 s->ctx_flags |= AVFMTCTX_NOHEADER;
113 m->header_state = m->header_state << 8 | v;
115 } while (v == sofdec[i] && i++ < 6);
117 /* no need to do more */
121 static int64_t get_pts(ByteIOContext *pb, int c)
125 buf[0] = c<0 ? get_byte(pb) : c;
126 get_buffer(pb, buf+1, 4);
128 return ff_parse_pes_pts(buf);
131 static int find_next_start_code(ByteIOContext *pb, int *size_ptr,
132 int32_t *header_state)
134 unsigned int state, v;
137 state = *header_state;
144 if (state == 0x000001) {
145 state = ((state << 8) | v) & 0xffffff;
149 state = ((state << 8) | v) & 0xffffff;
153 *header_state = state;
158 #if 0 /* unused, remove? */
160 static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)
162 int64_t pos, pos_start;
163 int max_size, start_code;
165 max_size = *size_ptr;
166 pos_start = url_ftell(pb);
168 /* in order to go faster, we fill the buffer */
169 pos = pos_start - 16386;
172 url_fseek(pb, pos, SEEK_SET);
178 if (pos < 0 || (pos_start - pos) >= max_size) {
182 url_fseek(pb, pos, SEEK_SET);
183 start_code = get_be32(pb);
184 if ((start_code & 0xffffff00) == 0x100)
188 *size_ptr = pos_start - pos;
194 * Extracts stream types from a program stream map
195 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
197 * @return number of bytes occupied by PSM in the bitstream
199 static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)
201 int psm_length, ps_info_length, es_map_length;
203 psm_length = get_be16(pb);
206 ps_info_length = get_be16(pb);
208 /* skip program_stream_info */
209 url_fskip(pb, ps_info_length);
210 es_map_length = get_be16(pb);
212 /* at least one es available? */
213 while (es_map_length >= 4){
214 unsigned char type = get_byte(pb);
215 unsigned char es_id = get_byte(pb);
216 uint16_t es_info_length = get_be16(pb);
217 /* remember mapping from stream id to stream type */
218 m->psm_es_type[es_id] = type;
219 /* skip program_stream_info */
220 url_fskip(pb, es_info_length);
221 es_map_length -= 4 + es_info_length;
223 get_be32(pb); /* crc32 */
224 return 2 + psm_length;
227 /* read the next PES header. Return its position in ppos
228 (if not NULL), and its start code, pts and dts.
230 static int mpegps_read_pes_header(AVFormatContext *s,
231 int64_t *ppos, int *pstart_code,
232 int64_t *ppts, int64_t *pdts)
234 MpegDemuxContext *m = s->priv_data;
235 int len, size, startcode, c, flags, header_len;
236 int pes_ext, ext2_len, id_ext, skip;
238 int64_t last_sync= url_ftell(s->pb);
241 url_fseek(s->pb, last_sync, SEEK_SET);
243 /* next start code (should be immediately after) */
244 m->header_state = 0xff;
245 size = MAX_SYNC_SIZE;
246 startcode = find_next_start_code(s->pb, &size, &m->header_state);
247 last_sync = url_ftell(s->pb);
248 //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, url_ftell(s->pb));
251 if (startcode == PACK_START_CODE)
253 if (startcode == SYSTEM_HEADER_START_CODE)
255 if (startcode == PADDING_STREAM) {
256 url_fskip(s->pb, get_be16(s->pb));
259 if (startcode == PRIVATE_STREAM_2) {
260 len = get_be16(s->pb);
263 if (get_byte(s->pb) == 'S') {
265 get_buffer(s->pb, buf, sizeof(buf));
266 m->sofdec = !memcmp(buf, "ofdec", 5);
271 m->sofdec -= !m->sofdec;
273 url_fskip(s->pb, len);
276 if (startcode == PROGRAM_STREAM_MAP) {
277 mpegps_psm_parse(m, s->pb);
281 /* find matching stream */
282 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
283 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
284 (startcode == 0x1bd) || (startcode == 0x1fd)))
287 *ppos = url_ftell(s->pb) - 4;
289 len = get_be16(s->pb);
291 dts = AV_NOPTS_VALUE;
298 /* XXX: for mpeg1, should test only bit 7 */
302 if ((c & 0xc0) == 0x40) {
303 /* buffer scale & size */
308 if ((c & 0xe0) == 0x20) {
309 dts = pts = get_pts(s->pb, c);
312 dts = get_pts(s->pb, -1);
315 } else if ((c & 0xc0) == 0x80) {
317 #if 0 /* some streams have this field set for no apparent reason */
318 if ((c & 0x30) != 0) {
319 /* Encrypted multiplex not handled */
323 flags = get_byte(s->pb);
324 header_len = get_byte(s->pb);
326 if (header_len > len)
330 dts = pts = get_pts(s->pb, -1);
333 dts = get_pts(s->pb, -1);
337 if (flags & 0x01) { /* PES extension */
338 pes_ext = get_byte(s->pb);
340 if (pes_ext & 0x40) { /* pack header - should be zero in PS */
343 /* Skip PES private data, program packet sequence counter and P-STD buffer */
344 skip = (pes_ext >> 4) & 0xb;
346 url_fskip(s->pb, skip);
349 if (pes_ext & 0x01) { /* PES extension 2 */
350 ext2_len = get_byte(s->pb);
352 if ((ext2_len & 0x7f) > 0) {
353 id_ext = get_byte(s->pb);
354 if ((id_ext & 0x80) == 0)
355 startcode = ((startcode & 0xff) << 8) | id_ext;
362 url_fskip(s->pb, header_len);
367 if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
368 startcode = get_byte(s->pb);
370 if (startcode >= 0x80 && startcode <= 0xcf) {
371 /* audio: skip header */
376 if (startcode >= 0xb0 && startcode <= 0xbf) {
377 /* MLP/TrueHD audio has a 4-byte header */
385 if(dts != AV_NOPTS_VALUE && ppos){
387 for(i=0; i<s->nb_streams; i++){
388 if(startcode == s->streams[i]->id &&
389 !url_is_streamed(s->pb) /* index useless on streams anyway */) {
390 ff_reduce_index(s, i);
391 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
396 *pstart_code = startcode;
402 static int mpegps_read_packet(AVFormatContext *s,
405 MpegDemuxContext *m = s->priv_data;
407 int len, startcode, i, type, codec_id = 0, es_type;
408 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
411 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
415 /* now find stream */
416 for(i=0;i<s->nb_streams;i++) {
418 if (st->id == startcode)
422 es_type = m->psm_es_type[startcode & 0xff];
424 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
425 codec_id = CODEC_ID_MPEG2VIDEO;
426 type = CODEC_TYPE_VIDEO;
427 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
428 codec_id = CODEC_ID_MPEG2VIDEO;
429 type = CODEC_TYPE_VIDEO;
430 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
431 es_type == STREAM_TYPE_AUDIO_MPEG2){
432 codec_id = CODEC_ID_MP3;
433 type = CODEC_TYPE_AUDIO;
434 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
435 codec_id = CODEC_ID_AAC;
436 type = CODEC_TYPE_AUDIO;
437 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
438 codec_id = CODEC_ID_MPEG4;
439 type = CODEC_TYPE_VIDEO;
440 } else if(es_type == STREAM_TYPE_VIDEO_H264){
441 codec_id = CODEC_ID_H264;
442 type = CODEC_TYPE_VIDEO;
443 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
444 codec_id = CODEC_ID_AC3;
445 type = CODEC_TYPE_AUDIO;
449 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
450 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
451 unsigned char buf[8];
452 get_buffer(s->pb, buf, 8);
453 url_fseek(s->pb, -8, SEEK_CUR);
454 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
455 codec_id = CODEC_ID_CAVS;
457 codec_id = CODEC_ID_MPEG2VIDEO;
458 type = CODEC_TYPE_VIDEO;
459 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
460 type = CODEC_TYPE_AUDIO;
461 codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
462 } else if (startcode >= 0x80 && startcode <= 0x87) {
463 type = CODEC_TYPE_AUDIO;
464 codec_id = CODEC_ID_AC3;
465 } else if ((startcode >= 0x88 && startcode <= 0x8f)
466 ||( startcode >= 0x98 && startcode <= 0x9f)) {
467 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
468 type = CODEC_TYPE_AUDIO;
469 codec_id = CODEC_ID_DTS;
470 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
471 type = CODEC_TYPE_AUDIO;
472 codec_id = CODEC_ID_PCM_S16BE;
473 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
474 type = CODEC_TYPE_AUDIO;
475 codec_id = CODEC_ID_MLP;
476 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
477 /* Used for both AC-3 and E-AC-3 in EVOB files */
478 type = CODEC_TYPE_AUDIO;
479 codec_id = CODEC_ID_AC3;
480 } else if (startcode >= 0x20 && startcode <= 0x3f) {
481 type = CODEC_TYPE_SUBTITLE;
482 codec_id = CODEC_ID_DVD_SUBTITLE;
483 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
484 type = CODEC_TYPE_VIDEO;
485 codec_id = CODEC_ID_VC1;
489 url_fskip(s->pb, len);
492 /* no stream found: add a new stream */
493 st = av_new_stream(s, startcode);
496 st->codec->codec_type = type;
497 st->codec->codec_id = codec_id;
498 if (codec_id != CODEC_ID_PCM_S16BE)
499 st->need_parsing = AVSTREAM_PARSE_FULL;
501 if(st->discard >= AVDISCARD_ALL)
503 if (startcode >= 0xa0 && startcode <= 0xaf) {
506 /* for LPCM, we just skip the header and consider it is raw
510 get_byte(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
511 b1 = get_byte(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
512 get_byte(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->bit_rate = st->codec->channels * st->codec->sample_rate * 2;
519 av_new_packet(pkt, len);
520 get_buffer(s->pb, pkt->data, pkt->size);
523 pkt->stream_index = st->index;
525 av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
526 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
532 static int mpegps_read_close(AVFormatContext *s)
537 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
538 int64_t *ppos, int64_t pos_limit)
541 int64_t pos, pts, dts;
545 printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);
547 url_fseek(s->pb, pos, SEEK_SET);
549 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
552 printf("none (ret=%d)\n", len);
554 return AV_NOPTS_VALUE;
556 if (startcode == s->streams[stream_index]->id &&
557 dts != AV_NOPTS_VALUE) {
560 url_fskip(s->pb, len);
563 printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
569 AVInputFormat mpegps_demuxer = {
572 sizeof(MpegDemuxContext),
577 NULL, //mpegps_read_seek,
579 .flags = AVFMT_SHOW_IDS,