2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 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
22 #include "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
31 /* 1.0 second at 24Mbit/s */
32 #define MAX_SCAN_PACKETS 32000
34 /* maximum size in which we look for synchronisation if
35 synchronisation is lost */
36 #define MAX_RESYNC_SIZE 4096
37 #define REGISTRATION_DESCRIPTOR 5
39 typedef struct PESContext PESContext;
41 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
42 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
44 enum MpegTSFilterType {
49 typedef struct MpegTSFilter MpegTSFilter;
51 typedef void PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start);
53 typedef struct MpegTSPESFilter {
58 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
60 typedef void SetServiceCallback(void *opaque, int ret);
62 typedef struct MpegTSSectionFilter {
66 unsigned int check_crc:1;
67 unsigned int end_of_section_reached:1;
68 SectionCallback *section_cb;
70 } MpegTSSectionFilter;
74 int last_cc; /* last cc code (-1 if first packet) */
75 enum MpegTSFilterType type;
77 MpegTSPESFilter pes_filter;
78 MpegTSSectionFilter section_filter;
82 #define MAX_PIDS_PER_PROGRAM 64
84 unsigned int id; //program id/service id
86 unsigned int pids[MAX_PIDS_PER_PROGRAM];
89 struct MpegTSContext {
91 AVFormatContext *stream;
92 /** raw packet size, including FEC if present */
97 /** if true, all pids are analyzed to find streams */
100 /** compute exact PCR for each transport stream packet */
101 int mpeg2ts_compute_pcr;
103 int64_t cur_pcr; /**< used to estimate the exact PCR */
104 int pcr_incr; /**< used to estimate the exact PCR */
106 /* data needed to handle file based ts */
107 /** stop parsing loop */
109 /** packet containing Audio/Video data */
112 /******************************************/
113 /* private mpegts data */
115 /** structure to keep track of Program->pids mapping */
120 /** filters for various streams specified by PMT + for the PAT and PMT */
121 MpegTSFilter *pids[NB_PID_MAX];
124 /* TS stream handling */
128 MPEGTS_PESHEADER_FILL,
133 /* enough for PES header + length */
134 #define PES_START_SIZE 9
135 #define MAX_PES_HEADER_SIZE (9 + 255)
139 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
142 AVFormatContext *stream;
144 enum MpegTSState state;
145 /* used to get the format */
150 uint8_t header[MAX_PES_HEADER_SIZE];
153 extern AVInputFormat mpegts_demuxer;
155 static void clear_program(MpegTSContext *ts, unsigned int programid)
159 for(i=0; i<ts->nb_prg; i++)
160 if(ts->prg[i].id == programid)
161 ts->prg[i].nb_pids = 0;
164 static void clear_programs(MpegTSContext *ts)
170 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
173 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
177 p = &ts->prg[ts->nb_prg];
183 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
186 struct Program *p = NULL;
187 for(i=0; i<ts->nb_prg; i++) {
188 if(ts->prg[i].id == programid) {
196 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
198 p->pids[p->nb_pids++] = pid;
202 * \brief discard_pid() decides if the pid is to be discarded according
203 * to caller's programs selection
204 * \param ts : - TS context
206 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
209 static int discard_pid(MpegTSContext *ts, unsigned int pid)
212 int used = 0, discarded = 0;
214 for(i=0; i<ts->nb_prg; i++) {
216 for(j=0; j<p->nb_pids; j++) {
217 if(p->pids[j] != pid)
219 //is program with id p->id set to be discarded?
220 for(k=0; k<ts->stream->nb_programs; k++) {
221 if(ts->stream->programs[k]->id == p->id) {
222 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
231 return !used && discarded;
235 * Assembles PES packets out of TS packets, and then calls the "section_cb"
236 * function when they are complete.
238 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
239 const uint8_t *buf, int buf_size, int is_start)
241 MpegTSSectionFilter *tss = &tss1->u.section_filter;
245 memcpy(tss->section_buf, buf, buf_size);
246 tss->section_index = buf_size;
247 tss->section_h_size = -1;
248 tss->end_of_section_reached = 0;
250 if (tss->end_of_section_reached)
252 len = 4096 - tss->section_index;
255 memcpy(tss->section_buf + tss->section_index, buf, len);
256 tss->section_index += len;
259 /* compute section length if possible */
260 if (tss->section_h_size == -1 && tss->section_index >= 3) {
261 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
264 tss->section_h_size = len;
267 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
268 tss->end_of_section_reached = 1;
269 if (!tss->check_crc ||
270 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
271 tss->section_buf, tss->section_h_size) == 0)
272 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
276 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
277 SectionCallback *section_cb, void *opaque,
281 MpegTSFilter *filter;
282 MpegTSSectionFilter *sec;
285 av_log(ts->stream, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid);
287 if (pid >= NB_PID_MAX || ts->pids[pid])
289 filter = av_mallocz(sizeof(MpegTSFilter));
292 ts->pids[pid] = filter;
293 filter->type = MPEGTS_SECTION;
295 filter->last_cc = -1;
296 sec = &filter->u.section_filter;
297 sec->section_cb = section_cb;
298 sec->opaque = opaque;
299 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
300 sec->check_crc = check_crc;
301 if (!sec->section_buf) {
308 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
312 MpegTSFilter *filter;
313 MpegTSPESFilter *pes;
315 if (pid >= NB_PID_MAX || ts->pids[pid])
317 filter = av_mallocz(sizeof(MpegTSFilter));
320 ts->pids[pid] = filter;
321 filter->type = MPEGTS_PES;
323 filter->last_cc = -1;
324 pes = &filter->u.pes_filter;
325 pes->pes_cb = pes_cb;
326 pes->opaque = opaque;
330 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
335 if (filter->type == MPEGTS_SECTION)
336 av_freep(&filter->u.section_filter.section_buf);
337 else if (filter->type == MPEGTS_PES) {
338 /* referenced private data will be freed later in
339 * av_close_input_stream */
340 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
341 av_freep(&filter->u.pes_filter.opaque);
346 ts->pids[pid] = NULL;
349 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
350 int stat[packet_size];
355 memset(stat, 0, packet_size*sizeof(int));
357 for(x=i=0; i<size-3; i++){
358 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
360 if(stat[x] > best_score){
367 if(x == packet_size) x= 0;
373 /* autodetect fec presence. Must have at least 1024 bytes */
374 static int get_packet_size(const uint8_t *buf, int size)
376 int score, fec_score, dvhs_score;
378 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
381 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
382 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
383 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
384 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
386 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
387 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
388 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
392 typedef struct SectionHeader {
397 uint8_t last_sec_num;
400 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
413 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
419 if ((p + 1) >= p_end)
427 /* read and allocate a DVB string preceeded by its length */
428 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
435 len = get8(&p, p_end);
438 if ((p + len) > p_end)
440 str = av_malloc(len + 1);
450 static int parse_section_header(SectionHeader *h,
451 const uint8_t **pp, const uint8_t *p_end)
455 val = get8(pp, p_end);
460 val = get16(pp, p_end);
464 val = get8(pp, p_end);
467 h->version = (val >> 1) & 0x1f;
468 val = get8(pp, p_end);
472 val = get8(pp, p_end);
475 h->last_sec_num = val;
480 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
482 MpegTSContext *ts = filter->u.section_filter.opaque;
483 SectionHeader h1, *h = &h1;
486 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
487 int program_info_length, pcr_pid, pid, stream_type;
488 int desc_list_len, desc_len, desc_tag;
489 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
490 char language[4] = {0}; /* initialize to kill warnings */
491 int has_hdmv_descr = 0;
492 int has_dirac_descr = 0;
495 av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
496 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
498 p_end = section + section_len - 4;
500 if (parse_section_header(h, &p, p_end) < 0)
503 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
504 h->id, h->sec_num, h->last_sec_num);
506 if (h->tid != PMT_TID)
509 clear_program(ts, h->id);
510 pcr_pid = get16(&p, p_end) & 0x1fff;
513 add_pid_to_pmt(ts, h->id, pcr_pid);
515 av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
517 program_info_length = get16(&p, p_end) & 0xfff;
518 if (program_info_length < 0)
520 while(program_info_length >= 2) {
522 tag = get8(&p, p_end);
523 len = get8(&p, p_end);
524 if(len > program_info_length - 2)
525 //something else is broken, exit the program_descriptors_loop
527 program_info_length -= len + 2;
528 if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
530 bytes[0] = get8(&p, p_end);
531 bytes[1] = get8(&p, p_end);
532 bytes[2] = get8(&p, p_end);
533 bytes[3] = get8(&p, p_end);
535 if(bytes[0] == 'H' && bytes[1] == 'D' &&
536 bytes[2] == 'M' && bytes[3] == 'V')
541 p += program_info_length;
547 stream_type = get8(&p, p_end);
550 pid = get16(&p, p_end) & 0x1fff;
553 desc_list_len = get16(&p, p_end) & 0xfff;
554 if (desc_list_len < 0)
556 desc_list_end = p + desc_list_len;
557 if (desc_list_end > p_end)
560 desc_tag = get8(&p, desc_list_end);
563 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
564 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
565 /*assume DVB AC-3 Audio*/
566 stream_type = STREAM_TYPE_AUDIO_AC3;
567 } else if(desc_tag == 0x7B) {
569 stream_type = STREAM_TYPE_AUDIO_DTS;
572 desc_len = get8(&p, desc_list_end);
573 desc_end = p + desc_len;
574 if (desc_end > desc_list_end)
577 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
581 case DVB_SUBT_DESCID:
582 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
583 stream_type = STREAM_TYPE_SUBTITLE_DVB;
585 language[0] = get8(&p, desc_end);
586 language[1] = get8(&p, desc_end);
587 language[2] = get8(&p, desc_end);
590 comp_page = get16(&p, desc_end);
591 anc_page = get16(&p, desc_end);
594 case 0x0a: /* ISO 639 language descriptor */
595 language[0] = get8(&p, desc_end);
596 language[1] = get8(&p, desc_end);
597 language[2] = get8(&p, desc_end);
600 case REGISTRATION_DESCRIPTOR: /*MPEG-2 Registration descriptor */
603 bytes[0] = get8(&p, desc_end);
604 bytes[1] = get8(&p, desc_end);
605 bytes[2] = get8(&p, desc_end);
606 bytes[3] = get8(&p, desc_end);
607 if(bytes[0] == 'd' && bytes[1] == 'r' &&
608 bytes[2] == 'a' && bytes[3] == 'c')
620 av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
624 /* now create ffmpeg stream */
625 switch(stream_type) {
626 case STREAM_TYPE_AUDIO_MPEG1:
627 case STREAM_TYPE_AUDIO_MPEG2:
628 case STREAM_TYPE_VIDEO_MPEG1:
629 case STREAM_TYPE_VIDEO_MPEG2:
630 case STREAM_TYPE_VIDEO_MPEG4:
631 case STREAM_TYPE_VIDEO_H264:
632 case STREAM_TYPE_VIDEO_VC1:
633 case STREAM_TYPE_VIDEO_DIRAC:
634 case STREAM_TYPE_AUDIO_AAC:
635 case STREAM_TYPE_AUDIO_AC3:
636 case STREAM_TYPE_AUDIO_DTS:
637 case STREAM_TYPE_AUDIO_HDMV_DTS:
638 case STREAM_TYPE_SUBTITLE_DVB:
639 if((stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
640 || (stream_type == STREAM_TYPE_VIDEO_DIRAC && !has_dirac_descr))
642 if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
643 pes= ts->pids[pid]->u.pes_filter.opaque;
646 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
647 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
649 st = new_pes_av_stream(pes, 0);
651 add_pid_to_pmt(ts, h->id, pid);
653 av_program_add_stream_index(ts->stream, h->id, st->index);
656 /* we ignore the other streams */
661 if (language[0] != 0) {
662 av_metadata_set(&st->metadata, "language", language);
665 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
666 st->codec->sub_id = (anc_page << 16) | comp_page;
670 /* all parameters are there */
672 mpegts_close_filter(ts, filter);
675 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
677 MpegTSContext *ts = filter->u.section_filter.opaque;
678 SectionHeader h1, *h = &h1;
679 const uint8_t *p, *p_end;
683 av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
684 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
686 p_end = section + section_len - 4;
688 if (parse_section_header(h, &p, p_end) < 0)
690 if (h->tid != PAT_TID)
695 sid = get16(&p, p_end);
698 pmt_pid = get16(&p, p_end) & 0x1fff;
702 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
707 av_new_program(ts->stream, sid);
709 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
710 add_pat_entry(ts, sid);
711 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
712 add_pid_to_pmt(ts, sid, pmt_pid);
718 mpegts_close_filter(ts, filter);
721 static void mpegts_set_service(MpegTSContext *ts)
723 mpegts_open_section_filter(ts, PAT_PID,
727 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
729 MpegTSContext *ts = filter->u.section_filter.opaque;
730 SectionHeader h1, *h = &h1;
731 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
732 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
733 char *name, *provider_name;
736 av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
737 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
740 p_end = section + section_len - 4;
742 if (parse_section_header(h, &p, p_end) < 0)
744 if (h->tid != SDT_TID)
746 onid = get16(&p, p_end);
749 val = get8(&p, p_end);
753 sid = get16(&p, p_end);
756 val = get8(&p, p_end);
759 desc_list_len = get16(&p, p_end) & 0xfff;
760 if (desc_list_len < 0)
762 desc_list_end = p + desc_list_len;
763 if (desc_list_end > p_end)
766 desc_tag = get8(&p, desc_list_end);
769 desc_len = get8(&p, desc_list_end);
770 desc_end = p + desc_len;
771 if (desc_end > desc_list_end)
774 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
779 service_type = get8(&p, p_end);
780 if (service_type < 0)
782 provider_name = getstr8(&p, p_end);
785 name = getstr8(&p, p_end);
787 AVProgram *program = av_new_program(ts->stream, sid);
789 av_metadata_set(&program->metadata, "name", name);
790 av_metadata_set(&program->metadata, "provider_name", provider_name);
794 av_free(provider_name);
805 /* scan services in a transport stream by looking at the SDT */
806 static void mpegts_scan_sdt(MpegTSContext *ts)
808 mpegts_open_section_filter(ts, SDT_PID,
812 static int64_t get_pts(const uint8_t *p)
814 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
815 pts |= (AV_RB16(p + 1) >> 1) << 15;
816 pts |= AV_RB16(p + 3) >> 1;
820 /* return non zero if a packet could be constructed */
821 static void mpegts_push_data(MpegTSFilter *filter,
822 const uint8_t *buf, int buf_size, int is_start)
824 PESContext *pes = filter->u.pes_filter.opaque;
825 MpegTSContext *ts = pes->ts;
833 pes->state = MPEGTS_HEADER;
837 while (buf_size > 0) {
840 len = PES_START_SIZE - pes->data_index;
843 memcpy(pes->header + pes->data_index, p, len);
844 pes->data_index += len;
847 if (pes->data_index == PES_START_SIZE) {
848 /* we got all the PES or section header. We can now
851 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
853 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
854 pes->header[2] == 0x01) {
855 /* it must be an mpeg2 PES stream */
856 code = pes->header[3] | 0x100;
857 if (!((code >= 0x1c0 && code <= 0x1df) ||
858 (code >= 0x1e0 && code <= 0x1ef) ||
859 (code == 0x1bd) || (code == 0x1fd)))
862 /* allocate stream */
863 new_pes_av_stream(pes, code);
865 pes->state = MPEGTS_PESHEADER_FILL;
866 pes->total_size = AV_RB16(pes->header + 4);
867 /* NOTE: a zero total size means the PES size is
870 pes->total_size += 6;
871 pes->pes_header_size = pes->header[8] + 9;
873 /* otherwise, it should be a table */
876 pes->state = MPEGTS_SKIP;
881 /**********************************************/
882 /* PES packing parsing */
883 case MPEGTS_PESHEADER_FILL:
884 len = pes->pes_header_size - pes->data_index;
887 memcpy(pes->header + pes->data_index, p, len);
888 pes->data_index += len;
891 if (pes->data_index == pes->pes_header_size) {
895 flags = pes->header[7];
897 pes->pts = AV_NOPTS_VALUE;
898 pes->dts = AV_NOPTS_VALUE;
899 if ((flags & 0xc0) == 0x80) {
900 pes->dts = pes->pts = get_pts(r);
902 } else if ((flags & 0xc0) == 0xc0) {
903 pes->pts = get_pts(r);
905 pes->dts = get_pts(r);
908 /* we got the full header. We parse it and get the payload */
909 pes->state = MPEGTS_PAYLOAD;
913 if (pes->total_size) {
914 len = pes->total_size - pes->data_index;
921 AVPacket *pkt = ts->pkt;
922 if (pes->st && av_new_packet(pkt, len) == 0) {
923 memcpy(pkt->data, p, len);
924 pkt->stream_index = pes->st->index;
927 /* reset pts values */
928 pes->pts = AV_NOPTS_VALUE;
929 pes->dts = AV_NOPTS_VALUE;
943 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
946 enum CodecID codec_id;
947 enum CodecType codec_type;
949 switch(pes->stream_type){
950 case STREAM_TYPE_AUDIO_MPEG1:
951 case STREAM_TYPE_AUDIO_MPEG2:
952 codec_type = CODEC_TYPE_AUDIO;
953 codec_id = CODEC_ID_MP3;
955 case STREAM_TYPE_VIDEO_MPEG1:
956 case STREAM_TYPE_VIDEO_MPEG2:
957 codec_type = CODEC_TYPE_VIDEO;
958 codec_id = CODEC_ID_MPEG2VIDEO;
960 case STREAM_TYPE_VIDEO_MPEG4:
961 codec_type = CODEC_TYPE_VIDEO;
962 codec_id = CODEC_ID_MPEG4;
964 case STREAM_TYPE_VIDEO_H264:
965 codec_type = CODEC_TYPE_VIDEO;
966 codec_id = CODEC_ID_H264;
968 case STREAM_TYPE_VIDEO_VC1:
969 codec_type = CODEC_TYPE_VIDEO;
970 codec_id = CODEC_ID_VC1;
972 case STREAM_TYPE_VIDEO_DIRAC:
973 codec_type = CODEC_TYPE_VIDEO;
974 codec_id = CODEC_ID_DIRAC;
976 case STREAM_TYPE_AUDIO_AAC:
977 codec_type = CODEC_TYPE_AUDIO;
978 codec_id = CODEC_ID_AAC;
980 case STREAM_TYPE_AUDIO_AC3:
981 codec_type = CODEC_TYPE_AUDIO;
982 codec_id = CODEC_ID_AC3;
984 case STREAM_TYPE_AUDIO_DTS:
985 case STREAM_TYPE_AUDIO_HDMV_DTS:
986 codec_type = CODEC_TYPE_AUDIO;
987 codec_id = CODEC_ID_DTS;
989 case STREAM_TYPE_SUBTITLE_DVB:
990 codec_type = CODEC_TYPE_SUBTITLE;
991 codec_id = CODEC_ID_DVB_SUBTITLE;
994 if (code >= 0x1c0 && code <= 0x1df) {
995 codec_type = CODEC_TYPE_AUDIO;
996 codec_id = CODEC_ID_MP2;
997 } else if (code == 0x1bd) {
998 codec_type = CODEC_TYPE_AUDIO;
999 codec_id = CODEC_ID_AC3;
1001 codec_type = CODEC_TYPE_VIDEO;
1002 codec_id = CODEC_ID_PROBE;
1006 st = av_new_stream(pes->stream, pes->pid);
1008 av_set_pts_info(st, 33, 1, 90000);
1009 st->priv_data = pes;
1010 st->codec->codec_type = codec_type;
1011 st->codec->codec_id = codec_id;
1012 st->need_parsing = AVSTREAM_PARSE_FULL;
1019 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1024 /* if no pid found, then add a pid context */
1025 pes = av_mallocz(sizeof(PESContext));
1029 pes->stream = ts->stream;
1031 pes->pcr_pid = pcr_pid;
1032 pes->stream_type = stream_type;
1033 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1041 /* handle one TS packet */
1042 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
1044 AVFormatContext *s = ts->stream;
1046 int len, pid, cc, cc_ok, afc, is_start;
1047 const uint8_t *p, *p_end;
1049 pid = AV_RB16(packet + 1) & 0x1fff;
1050 if(pid && discard_pid(ts, pid))
1052 is_start = packet[1] & 0x40;
1053 tss = ts->pids[pid];
1054 if (ts->auto_guess && tss == NULL && is_start) {
1055 add_pes_stream(ts, pid, -1, 0);
1056 tss = ts->pids[pid];
1061 /* continuity check (currently not used) */
1062 cc = (packet[3] & 0xf);
1063 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1066 /* skip adaptation field */
1067 afc = (packet[3] >> 4) & 3;
1069 if (afc == 0) /* reserved value */
1071 if (afc == 2) /* adaptation field only */
1074 /* skip adapation field */
1077 /* if past the end of packet, ignore */
1078 p_end = packet + TS_PACKET_SIZE;
1082 ts->pos47= url_ftell(ts->stream->pb) % ts->raw_packet_size;
1084 if (tss->type == MPEGTS_SECTION) {
1086 /* pointer field present */
1088 if (p + len > p_end)
1091 /* write remaining section bytes */
1092 write_section_data(s, tss,
1094 /* check whether filter has been closed */
1100 write_section_data(s, tss,
1105 write_section_data(s, tss,
1110 tss->u.pes_filter.pes_cb(tss,
1111 p, p_end - p, is_start);
1115 /* XXX: try to find a better synchro over several packets (use
1116 get_packet_size() ?) */
1117 static int mpegts_resync(ByteIOContext *pb)
1121 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1126 url_fseek(pb, -1, SEEK_CUR);
1134 /* return -1 if error or EOF. Return 0 if OK. */
1135 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1140 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1141 if (len != TS_PACKET_SIZE)
1142 return AVERROR(EIO);
1143 /* check paquet sync byte */
1144 if (buf[0] != 0x47) {
1145 /* find a new packet start */
1146 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1147 if (mpegts_resync(pb) < 0)
1148 return AVERROR_INVALIDDATA;
1152 skip = raw_packet_size - TS_PACKET_SIZE;
1154 url_fskip(pb, skip);
1161 static int handle_packets(MpegTSContext *ts, int nb_packets)
1163 AVFormatContext *s = ts->stream;
1164 ByteIOContext *pb = s->pb;
1165 uint8_t packet[TS_PACKET_SIZE];
1166 int packet_num, ret;
1171 if (ts->stop_parse>0)
1174 if (nb_packets != 0 && packet_num >= nb_packets)
1176 ret = read_packet(pb, packet, ts->raw_packet_size);
1179 handle_packet(ts, packet);
1184 static int mpegts_probe(AVProbeData *p)
1187 const int size= p->buf_size;
1188 int score, fec_score, dvhs_score;
1189 int check_count= size / TS_FEC_PACKET_SIZE;
1190 #define CHECK_COUNT 10
1192 if (check_count < CHECK_COUNT)
1195 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1196 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1197 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1198 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1200 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1201 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1202 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1203 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1206 /* only use the extension for safer guess */
1207 if (match_ext(p->filename, "ts"))
1208 return AVPROBE_SCORE_MAX;
1214 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1215 (-1) if not available */
1216 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1217 const uint8_t *packet)
1219 int afc, len, flags;
1223 afc = (packet[3] >> 4) & 3;
1233 if (!(flags & 0x10))
1238 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1239 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1243 static int mpegts_read_header(AVFormatContext *s,
1244 AVFormatParameters *ap)
1246 MpegTSContext *ts = s->priv_data;
1247 ByteIOContext *pb = s->pb;
1248 uint8_t buf[5*1024];
1253 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1254 if(ap->mpeg2ts_raw){
1255 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1260 /* read the first 1024 bytes to get packet size */
1261 pos = url_ftell(pb);
1262 len = get_buffer(pb, buf, sizeof(buf));
1263 if (len != sizeof(buf))
1265 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1266 if (ts->raw_packet_size <= 0)
1271 if (s->iformat == &mpegts_demuxer) {
1274 /* first do a scaning to get all the services */
1275 url_fseek(pb, pos, SEEK_SET);
1276 mpegts_scan_sdt(ts);
1278 mpegts_set_service(ts);
1280 handle_packets(ts, s->probesize);
1281 /* if could not find service, enable auto_guess */
1286 av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
1288 s->ctx_flags |= AVFMTCTX_NOHEADER;
1291 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1292 int64_t pcrs[2], pcr_h;
1293 int packet_count[2];
1294 uint8_t packet[TS_PACKET_SIZE];
1296 /* only read packets */
1298 st = av_new_stream(s, 0);
1301 av_set_pts_info(st, 60, 1, 27000000);
1302 st->codec->codec_type = CODEC_TYPE_DATA;
1303 st->codec->codec_id = CODEC_ID_MPEG2TS;
1305 /* we iterate until we find two PCRs to estimate the bitrate */
1310 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1313 pid = AV_RB16(packet + 1) & 0x1fff;
1314 if ((pcr_pid == -1 || pcr_pid == pid) &&
1315 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1317 packet_count[nb_pcrs] = nb_packets;
1318 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1326 /* NOTE1: the bitrate is computed without the FEC */
1327 /* NOTE2: it is only the bitrate of the start of the stream */
1328 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1329 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1330 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1331 st->codec->bit_rate = s->bit_rate;
1332 st->start_time = ts->cur_pcr;
1334 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1335 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1339 url_fseek(pb, pos, SEEK_SET);
1345 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1347 static int mpegts_raw_read_packet(AVFormatContext *s,
1350 MpegTSContext *ts = s->priv_data;
1352 int64_t pcr_h, next_pcr_h, pos;
1353 int pcr_l, next_pcr_l;
1354 uint8_t pcr_buf[12];
1356 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1357 return AVERROR(ENOMEM);
1358 pkt->pos= url_ftell(s->pb);
1359 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1361 av_free_packet(pkt);
1364 if (ts->mpeg2ts_compute_pcr) {
1365 /* compute exact PCR for each packet */
1366 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1367 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1368 pos = url_ftell(s->pb);
1369 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1370 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1371 get_buffer(s->pb, pcr_buf, 12);
1372 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1373 /* XXX: not precise enough */
1374 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1379 url_fseek(s->pb, pos, SEEK_SET);
1380 /* no next PCR found: we use previous increment */
1381 ts->cur_pcr = pcr_h * 300 + pcr_l;
1383 pkt->pts = ts->cur_pcr;
1384 pkt->duration = ts->pcr_incr;
1385 ts->cur_pcr += ts->pcr_incr;
1387 pkt->stream_index = 0;
1391 static int mpegts_read_packet(AVFormatContext *s,
1394 MpegTSContext *ts = s->priv_data;
1397 return handle_packets(ts, 0);
1400 static int mpegts_read_close(AVFormatContext *s)
1402 MpegTSContext *ts = s->priv_data;
1407 for(i=0;i<NB_PID_MAX;i++)
1408 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1413 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1414 int64_t *ppos, int64_t pos_limit)
1416 MpegTSContext *ts = s->priv_data;
1417 int64_t pos, timestamp;
1418 uint8_t buf[TS_PACKET_SIZE];
1419 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1420 const int find_next= 1;
1421 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1424 url_fseek(s->pb, pos, SEEK_SET);
1425 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1426 return AV_NOPTS_VALUE;
1427 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1428 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1431 pos += ts->raw_packet_size;
1435 pos -= ts->raw_packet_size;
1437 return AV_NOPTS_VALUE;
1438 url_fseek(s->pb, pos, SEEK_SET);
1439 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1440 return AV_NOPTS_VALUE;
1441 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1442 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1452 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1453 MpegTSContext *ts = s->priv_data;
1454 uint8_t buf[TS_PACKET_SIZE];
1457 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1460 pos= url_ftell(s->pb);
1463 url_fseek(s->pb, pos, SEEK_SET);
1464 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1466 // pid = AV_RB16(buf + 1) & 0x1fff;
1467 if(buf[1] & 0x40) break;
1468 pos += ts->raw_packet_size;
1470 url_fseek(s->pb, pos, SEEK_SET);
1475 /**************************************************************/
1476 /* parsing functions - called from other demuxers such as RTP */
1478 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1482 ts = av_mallocz(sizeof(MpegTSContext));
1485 /* no stream case, currently used by RTP */
1486 ts->raw_packet_size = TS_PACKET_SIZE;
1492 /* return the consumed length if a packet was output, or -1 if no
1494 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1495 const uint8_t *buf, int len)
1503 if (ts->stop_parse>0)
1505 if (len < TS_PACKET_SIZE)
1507 if (buf[0] != 0x47) {
1511 handle_packet(ts, buf);
1512 buf += TS_PACKET_SIZE;
1513 len -= TS_PACKET_SIZE;
1519 void mpegts_parse_close(MpegTSContext *ts)
1523 for(i=0;i<NB_PID_MAX;i++)
1524 av_free(ts->pids[i]);
1528 AVInputFormat mpegts_demuxer = {
1530 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1531 sizeof(MpegTSContext),
1538 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1541 AVInputFormat mpegtsraw_demuxer = {
1543 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1544 sizeof(MpegTSContext),
1547 mpegts_raw_read_packet,
1551 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,