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"
29 /* 1.0 second at 24Mbit/s */
30 #define MAX_SCAN_PACKETS 32000
32 /* maximum size in which we look for synchronisation if
33 synchronisation is lost */
34 #define MAX_RESYNC_SIZE 4096
35 #define REGISTRATION_DESCRIPTOR 5
37 typedef struct PESContext PESContext;
39 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
40 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
41 extern void av_set_program_name(AVProgram *program, char *provider_name, char *name);
42 extern void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);
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 {
67 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(Program_t));
177 p = &ts->prg[ts->nb_prg];
183 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
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 av_freep(&filter->u.pes_filter.opaque);
341 ts->pids[pid] = NULL;
344 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
345 int stat[packet_size];
350 memset(stat, 0, packet_size*sizeof(int));
352 for(x=i=0; i<size; i++){
355 if(stat[x] > best_score){
362 if(x == packet_size) x= 0;
368 /* autodetect fec presence. Must have at least 1024 bytes */
369 static int get_packet_size(const uint8_t *buf, int size)
371 int score, fec_score, dvhs_score;
373 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
376 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
377 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
378 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
379 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
381 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
382 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
383 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
387 typedef struct SectionHeader {
392 uint8_t last_sec_num;
395 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
408 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
414 if ((p + 1) >= p_end)
422 /* read and allocate a DVB string preceeded by its length */
423 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
430 len = get8(&p, p_end);
433 if ((p + len) > p_end)
435 str = av_malloc(len + 1);
445 static int parse_section_header(SectionHeader *h,
446 const uint8_t **pp, const uint8_t *p_end)
450 val = get8(pp, p_end);
455 val = get16(pp, p_end);
459 val = get8(pp, p_end);
462 h->version = (val >> 1) & 0x1f;
463 val = get8(pp, p_end);
467 val = get8(pp, p_end);
470 h->last_sec_num = val;
475 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
477 MpegTSContext *ts = filter->u.section_filter.opaque;
478 SectionHeader h1, *h = &h1;
481 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
482 int program_info_length, pcr_pid, pid, stream_type;
483 int desc_list_len, desc_len, desc_tag;
484 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
485 char language[4] = {0}; /* initialize to kill warnings */
486 int has_hdmv_descr = 0;
489 av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
490 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
492 p_end = section + section_len - 4;
494 if (parse_section_header(h, &p, p_end) < 0)
497 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
498 h->id, h->sec_num, h->last_sec_num);
500 if (h->tid != PMT_TID)
503 clear_program(ts, h->id);
504 pcr_pid = get16(&p, p_end) & 0x1fff;
507 add_pid_to_pmt(ts, h->id, pcr_pid);
509 av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
511 program_info_length = get16(&p, p_end) & 0xfff;
512 if (program_info_length < 0)
514 while(program_info_length >= 2) {
516 tag = get8(&p, p_end);
517 len = get8(&p, p_end);
518 if(len > program_info_length - 2)
519 //something else is broken, exit the program_descriptors_loop
521 program_info_length -= len + 2;
522 if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
524 bytes[0] = get8(&p, p_end);
525 bytes[1] = get8(&p, p_end);
526 bytes[2] = get8(&p, p_end);
527 bytes[3] = get8(&p, p_end);
529 if(bytes[0] == 'H' && bytes[1] == 'D' &&
530 bytes[2] == 'M' && bytes[3] == 'V')
535 p += program_info_length;
541 stream_type = get8(&p, p_end);
544 pid = get16(&p, p_end) & 0x1fff;
547 desc_list_len = get16(&p, p_end) & 0xfff;
548 if (desc_list_len < 0)
550 desc_list_end = p + desc_list_len;
551 if (desc_list_end > p_end)
554 desc_tag = get8(&p, desc_list_end);
557 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
558 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
559 /*assume DVB AC-3 Audio*/
560 stream_type = STREAM_TYPE_AUDIO_AC3;
561 } else if(desc_tag == 0x7B) {
563 stream_type = STREAM_TYPE_AUDIO_DTS;
566 desc_len = get8(&p, desc_list_end);
567 desc_end = p + desc_len;
568 if (desc_end > desc_list_end)
571 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
575 case DVB_SUBT_DESCID:
576 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
577 stream_type = STREAM_TYPE_SUBTITLE_DVB;
579 language[0] = get8(&p, desc_end);
580 language[1] = get8(&p, desc_end);
581 language[2] = get8(&p, desc_end);
584 comp_page = get16(&p, desc_end);
585 anc_page = get16(&p, desc_end);
588 case 0x0a: /* ISO 639 language descriptor */
589 language[0] = get8(&p, desc_end);
590 language[1] = get8(&p, desc_end);
591 language[2] = get8(&p, desc_end);
602 av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
606 /* now create ffmpeg stream */
607 switch(stream_type) {
608 case STREAM_TYPE_AUDIO_MPEG1:
609 case STREAM_TYPE_AUDIO_MPEG2:
610 case STREAM_TYPE_VIDEO_MPEG1:
611 case STREAM_TYPE_VIDEO_MPEG2:
612 case STREAM_TYPE_VIDEO_MPEG4:
613 case STREAM_TYPE_VIDEO_H264:
614 case STREAM_TYPE_VIDEO_VC1:
615 case STREAM_TYPE_AUDIO_AAC:
616 case STREAM_TYPE_AUDIO_AC3:
617 case STREAM_TYPE_AUDIO_DTS:
618 case STREAM_TYPE_AUDIO_HDMV_DTS:
619 case STREAM_TYPE_SUBTITLE_DVB:
620 if(stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
622 if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
623 pes= ts->pids[pid]->u.pes_filter.opaque;
626 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
627 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
629 st = new_pes_av_stream(pes, 0);
631 add_pid_to_pmt(ts, h->id, pid);
633 av_program_add_stream_index(ts->stream, h->id, st->index);
636 /* we ignore the other streams */
641 if (language[0] != 0) {
642 memcpy(st->language, language, 4);
645 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
646 st->codec->sub_id = (anc_page << 16) | comp_page;
650 /* all parameters are there */
652 mpegts_close_filter(ts, filter);
655 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
657 MpegTSContext *ts = filter->u.section_filter.opaque;
658 SectionHeader h1, *h = &h1;
659 const uint8_t *p, *p_end;
663 av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
664 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
666 p_end = section + section_len - 4;
668 if (parse_section_header(h, &p, p_end) < 0)
670 if (h->tid != PAT_TID)
675 sid = get16(&p, p_end);
678 pmt_pid = get16(&p, p_end) & 0x1fff;
682 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
687 av_new_program(ts->stream, sid);
689 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
690 add_pat_entry(ts, sid);
691 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
692 add_pid_to_pmt(ts, sid, pmt_pid);
698 mpegts_close_filter(ts, filter);
701 static void mpegts_set_service(MpegTSContext *ts)
703 mpegts_open_section_filter(ts, PAT_PID,
707 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
709 MpegTSContext *ts = filter->u.section_filter.opaque;
710 SectionHeader h1, *h = &h1;
711 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
712 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
713 char *name, *provider_name;
716 av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
717 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
720 p_end = section + section_len - 4;
722 if (parse_section_header(h, &p, p_end) < 0)
724 if (h->tid != SDT_TID)
726 onid = get16(&p, p_end);
729 val = get8(&p, p_end);
733 sid = get16(&p, p_end);
736 val = get8(&p, p_end);
739 desc_list_len = get16(&p, p_end) & 0xfff;
740 if (desc_list_len < 0)
742 desc_list_end = p + desc_list_len;
743 if (desc_list_end > p_end)
746 desc_tag = get8(&p, desc_list_end);
749 desc_len = get8(&p, desc_list_end);
750 desc_end = p + desc_len;
751 if (desc_end > desc_list_end)
754 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
759 service_type = get8(&p, p_end);
760 if (service_type < 0)
762 provider_name = getstr8(&p, p_end);
765 name = getstr8(&p, p_end);
767 AVProgram *program = av_new_program(ts->stream, sid);
769 av_set_program_name(program, provider_name, name);
772 av_free(provider_name);
783 /* scan services in a transport stream by looking at the SDT */
784 static void mpegts_scan_sdt(MpegTSContext *ts)
786 mpegts_open_section_filter(ts, SDT_PID,
790 static int64_t get_pts(const uint8_t *p)
792 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
793 pts |= (AV_RB16(p + 1) >> 1) << 15;
794 pts |= AV_RB16(p + 3) >> 1;
798 /* return non zero if a packet could be constructed */
799 static void mpegts_push_data(MpegTSFilter *filter,
800 const uint8_t *buf, int buf_size, int is_start)
802 PESContext *pes = filter->u.pes_filter.opaque;
803 MpegTSContext *ts = pes->ts;
811 pes->state = MPEGTS_HEADER;
815 while (buf_size > 0) {
818 len = PES_START_SIZE - pes->data_index;
821 memcpy(pes->header + pes->data_index, p, len);
822 pes->data_index += len;
825 if (pes->data_index == PES_START_SIZE) {
826 /* we got all the PES or section header. We can now
829 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
831 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
832 pes->header[2] == 0x01) {
833 /* it must be an mpeg2 PES stream */
834 code = pes->header[3] | 0x100;
835 if (!((code >= 0x1c0 && code <= 0x1df) ||
836 (code >= 0x1e0 && code <= 0x1ef) ||
837 (code == 0x1bd) || (code == 0x1fd)))
840 /* allocate stream */
841 new_pes_av_stream(pes, code);
843 pes->state = MPEGTS_PESHEADER_FILL;
844 pes->total_size = AV_RB16(pes->header + 4);
845 /* NOTE: a zero total size means the PES size is
848 pes->total_size += 6;
849 pes->pes_header_size = pes->header[8] + 9;
851 /* otherwise, it should be a table */
854 pes->state = MPEGTS_SKIP;
859 /**********************************************/
860 /* PES packing parsing */
861 case MPEGTS_PESHEADER_FILL:
862 len = pes->pes_header_size - pes->data_index;
865 memcpy(pes->header + pes->data_index, p, len);
866 pes->data_index += len;
869 if (pes->data_index == pes->pes_header_size) {
873 flags = pes->header[7];
875 pes->pts = AV_NOPTS_VALUE;
876 pes->dts = AV_NOPTS_VALUE;
877 if ((flags & 0xc0) == 0x80) {
878 pes->pts = get_pts(r);
880 } else if ((flags & 0xc0) == 0xc0) {
881 pes->pts = get_pts(r);
883 pes->dts = get_pts(r);
886 /* we got the full header. We parse it and get the payload */
887 pes->state = MPEGTS_PAYLOAD;
891 if (pes->total_size) {
892 len = pes->total_size - pes->data_index;
899 AVPacket *pkt = ts->pkt;
900 if (pes->st && av_new_packet(pkt, len) == 0) {
901 memcpy(pkt->data, p, len);
902 pkt->stream_index = pes->st->index;
905 /* reset pts values */
906 pes->pts = AV_NOPTS_VALUE;
907 pes->dts = AV_NOPTS_VALUE;
921 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
924 int codec_type, codec_id;
926 switch(pes->stream_type){
927 case STREAM_TYPE_AUDIO_MPEG1:
928 case STREAM_TYPE_AUDIO_MPEG2:
929 codec_type = CODEC_TYPE_AUDIO;
930 codec_id = CODEC_ID_MP3;
932 case STREAM_TYPE_VIDEO_MPEG1:
933 case STREAM_TYPE_VIDEO_MPEG2:
934 codec_type = CODEC_TYPE_VIDEO;
935 codec_id = CODEC_ID_MPEG2VIDEO;
937 case STREAM_TYPE_VIDEO_MPEG4:
938 codec_type = CODEC_TYPE_VIDEO;
939 codec_id = CODEC_ID_MPEG4;
941 case STREAM_TYPE_VIDEO_H264:
942 codec_type = CODEC_TYPE_VIDEO;
943 codec_id = CODEC_ID_H264;
945 case STREAM_TYPE_VIDEO_VC1:
946 codec_type = CODEC_TYPE_VIDEO;
947 codec_id = CODEC_ID_VC1;
949 case STREAM_TYPE_AUDIO_AAC:
950 codec_type = CODEC_TYPE_AUDIO;
951 codec_id = CODEC_ID_AAC;
953 case STREAM_TYPE_AUDIO_AC3:
954 codec_type = CODEC_TYPE_AUDIO;
955 codec_id = CODEC_ID_AC3;
957 case STREAM_TYPE_AUDIO_DTS:
958 case STREAM_TYPE_AUDIO_HDMV_DTS:
959 codec_type = CODEC_TYPE_AUDIO;
960 codec_id = CODEC_ID_DTS;
962 case STREAM_TYPE_SUBTITLE_DVB:
963 codec_type = CODEC_TYPE_SUBTITLE;
964 codec_id = CODEC_ID_DVB_SUBTITLE;
967 if (code >= 0x1c0 && code <= 0x1df) {
968 codec_type = CODEC_TYPE_AUDIO;
969 codec_id = CODEC_ID_MP2;
970 } else if (code == 0x1bd) {
971 codec_type = CODEC_TYPE_AUDIO;
972 codec_id = CODEC_ID_AC3;
974 codec_type = CODEC_TYPE_VIDEO;
975 codec_id = CODEC_ID_MPEG1VIDEO;
979 st = av_new_stream(pes->stream, pes->pid);
981 av_set_pts_info(st, 33, 1, 90000);
983 st->codec->codec_type = codec_type;
984 st->codec->codec_id = codec_id;
985 st->need_parsing = AVSTREAM_PARSE_FULL;
992 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
997 /* if no pid found, then add a pid context */
998 pes = av_mallocz(sizeof(PESContext));
1002 pes->stream = ts->stream;
1004 pes->pcr_pid = pcr_pid;
1005 pes->stream_type = stream_type;
1006 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1014 /* handle one TS packet */
1015 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
1017 AVFormatContext *s = ts->stream;
1019 int len, pid, cc, cc_ok, afc, is_start;
1020 const uint8_t *p, *p_end;
1022 pid = AV_RB16(packet + 1) & 0x1fff;
1023 if(pid && discard_pid(ts, pid))
1025 is_start = packet[1] & 0x40;
1026 tss = ts->pids[pid];
1027 if (ts->auto_guess && tss == NULL && is_start) {
1028 add_pes_stream(ts, pid, -1, 0);
1029 tss = ts->pids[pid];
1034 /* continuity check (currently not used) */
1035 cc = (packet[3] & 0xf);
1036 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1039 /* skip adaptation field */
1040 afc = (packet[3] >> 4) & 3;
1042 if (afc == 0) /* reserved value */
1044 if (afc == 2) /* adaptation field only */
1047 /* skip adapation field */
1050 /* if past the end of packet, ignore */
1051 p_end = packet + TS_PACKET_SIZE;
1055 ts->pos47= url_ftell(ts->stream->pb) % ts->raw_packet_size;
1057 if (tss->type == MPEGTS_SECTION) {
1059 /* pointer field present */
1061 if (p + len > p_end)
1064 /* write remaining section bytes */
1065 write_section_data(s, tss,
1067 /* check whether filter has been closed */
1073 write_section_data(s, tss,
1078 write_section_data(s, tss,
1083 tss->u.pes_filter.pes_cb(tss,
1084 p, p_end - p, is_start);
1088 /* XXX: try to find a better synchro over several packets (use
1089 get_packet_size() ?) */
1090 static int mpegts_resync(ByteIOContext *pb)
1094 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1099 url_fseek(pb, -1, SEEK_CUR);
1107 /* return -1 if error or EOF. Return 0 if OK. */
1108 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1113 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1114 if (len != TS_PACKET_SIZE)
1115 return AVERROR(EIO);
1116 /* check paquet sync byte */
1117 if (buf[0] != 0x47) {
1118 /* find a new packet start */
1119 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1120 if (mpegts_resync(pb) < 0)
1121 return AVERROR_INVALIDDATA;
1125 skip = raw_packet_size - TS_PACKET_SIZE;
1127 url_fskip(pb, skip);
1134 static int handle_packets(MpegTSContext *ts, int nb_packets)
1136 AVFormatContext *s = ts->stream;
1137 ByteIOContext *pb = s->pb;
1138 uint8_t packet[TS_PACKET_SIZE];
1139 int packet_num, ret;
1144 if (ts->stop_parse>0)
1147 if (nb_packets != 0 && packet_num >= nb_packets)
1149 ret = read_packet(pb, packet, ts->raw_packet_size);
1152 handle_packet(ts, packet);
1157 static int mpegts_probe(AVProbeData *p)
1160 const int size= p->buf_size;
1161 int score, fec_score, dvhs_score;
1162 #define CHECK_COUNT 10
1164 if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))
1167 score = analyze(p->buf, TS_PACKET_SIZE *CHECK_COUNT, TS_PACKET_SIZE, NULL);
1168 dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);
1169 fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);
1170 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1172 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1173 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1174 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1175 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1178 /* only use the extension for safer guess */
1179 if (match_ext(p->filename, "ts"))
1180 return AVPROBE_SCORE_MAX;
1186 /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return
1187 (-1) if not available */
1188 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1189 const uint8_t *packet)
1191 int afc, len, flags;
1195 afc = (packet[3] >> 4) & 3;
1205 if (!(flags & 0x10))
1210 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1211 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1215 static int mpegts_read_header(AVFormatContext *s,
1216 AVFormatParameters *ap)
1218 MpegTSContext *ts = s->priv_data;
1219 ByteIOContext *pb = s->pb;
1225 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1226 if(ap->mpeg2ts_raw){
1227 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1232 /* read the first 1024 bytes to get packet size */
1233 pos = url_ftell(pb);
1234 len = get_buffer(pb, buf, sizeof(buf));
1235 if (len != sizeof(buf))
1237 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1238 if (ts->raw_packet_size <= 0)
1243 if (s->iformat == &mpegts_demuxer) {
1246 /* first do a scaning to get all the services */
1247 url_fseek(pb, pos, SEEK_SET);
1248 mpegts_scan_sdt(ts);
1250 mpegts_set_service(ts);
1252 handle_packets(ts, s->probesize);
1253 /* if could not find service, enable auto_guess */
1258 av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
1260 s->ctx_flags |= AVFMTCTX_NOHEADER;
1263 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1264 int64_t pcrs[2], pcr_h;
1265 int packet_count[2];
1266 uint8_t packet[TS_PACKET_SIZE];
1268 /* only read packets */
1270 st = av_new_stream(s, 0);
1273 av_set_pts_info(st, 60, 1, 27000000);
1274 st->codec->codec_type = CODEC_TYPE_DATA;
1275 st->codec->codec_id = CODEC_ID_MPEG2TS;
1277 /* we iterate until we find two PCRs to estimate the bitrate */
1282 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1285 pid = AV_RB16(packet + 1) & 0x1fff;
1286 if ((pcr_pid == -1 || pcr_pid == pid) &&
1287 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1289 packet_count[nb_pcrs] = nb_packets;
1290 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1298 /* NOTE1: the bitrate is computed without the FEC */
1299 /* NOTE2: it is only the bitrate of the start of the stream */
1300 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1301 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1302 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1303 st->codec->bit_rate = s->bit_rate;
1304 st->start_time = ts->cur_pcr;
1306 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1307 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1311 url_fseek(pb, pos, SEEK_SET);
1317 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1319 static int mpegts_raw_read_packet(AVFormatContext *s,
1322 MpegTSContext *ts = s->priv_data;
1324 int64_t pcr_h, next_pcr_h, pos;
1325 int pcr_l, next_pcr_l;
1326 uint8_t pcr_buf[12];
1328 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1329 return AVERROR(ENOMEM);
1330 pkt->pos= url_ftell(s->pb);
1331 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1333 av_free_packet(pkt);
1336 if (ts->mpeg2ts_compute_pcr) {
1337 /* compute exact PCR for each packet */
1338 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1339 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1340 pos = url_ftell(s->pb);
1341 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1342 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1343 get_buffer(s->pb, pcr_buf, 12);
1344 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1345 /* XXX: not precise enough */
1346 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1351 url_fseek(s->pb, pos, SEEK_SET);
1352 /* no next PCR found: we use previous increment */
1353 ts->cur_pcr = pcr_h * 300 + pcr_l;
1355 pkt->pts = ts->cur_pcr;
1356 pkt->duration = ts->pcr_incr;
1357 ts->cur_pcr += ts->pcr_incr;
1359 pkt->stream_index = 0;
1363 static int mpegts_read_packet(AVFormatContext *s,
1366 MpegTSContext *ts = s->priv_data;
1369 return handle_packets(ts, 0);
1372 static int mpegts_read_close(AVFormatContext *s)
1374 MpegTSContext *ts = s->priv_data;
1379 for(i=0;i<NB_PID_MAX;i++)
1380 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1385 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1386 int64_t *ppos, int64_t pos_limit)
1388 MpegTSContext *ts = s->priv_data;
1389 int64_t pos, timestamp;
1390 uint8_t buf[TS_PACKET_SIZE];
1391 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1392 const int find_next= 1;
1393 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1396 url_fseek(s->pb, pos, SEEK_SET);
1397 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1398 return AV_NOPTS_VALUE;
1399 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1400 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1403 pos += ts->raw_packet_size;
1407 pos -= ts->raw_packet_size;
1409 return AV_NOPTS_VALUE;
1410 url_fseek(s->pb, pos, SEEK_SET);
1411 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1412 return AV_NOPTS_VALUE;
1413 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1414 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1424 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1425 MpegTSContext *ts = s->priv_data;
1426 uint8_t buf[TS_PACKET_SIZE];
1429 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1432 pos= url_ftell(s->pb);
1435 url_fseek(s->pb, pos, SEEK_SET);
1436 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1438 // pid = AV_RB16(buf + 1) & 0x1fff;
1439 if(buf[1] & 0x40) break;
1440 pos += ts->raw_packet_size;
1442 url_fseek(s->pb, pos, SEEK_SET);
1447 /**************************************************************/
1448 /* parsing functions - called from other demuxers such as RTP */
1450 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1454 ts = av_mallocz(sizeof(MpegTSContext));
1457 /* no stream case, currently used by RTP */
1458 ts->raw_packet_size = TS_PACKET_SIZE;
1464 /* return the consumed length if a packet was output, or -1 if no
1466 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1467 const uint8_t *buf, int len)
1475 if (ts->stop_parse>0)
1477 if (len < TS_PACKET_SIZE)
1479 if (buf[0] != 0x47) {
1483 handle_packet(ts, buf);
1484 buf += TS_PACKET_SIZE;
1485 len -= TS_PACKET_SIZE;
1491 void mpegts_parse_close(MpegTSContext *ts)
1495 for(i=0;i<NB_PID_MAX;i++)
1496 av_free(ts->pids[i]);
1500 AVInputFormat mpegts_demuxer = {
1502 "MPEG2 transport stream format",
1503 sizeof(MpegTSContext),
1510 .flags = AVFMT_SHOW_IDS,
1513 AVInputFormat mpegtsraw_demuxer = {
1515 "MPEG2 raw transport stream format",
1516 sizeof(MpegTSContext),
1519 mpegts_raw_read_packet,
1523 .flags = AVFMT_SHOW_IDS,