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
28 /* 1.0 second at 24Mbit/s */
29 #define MAX_SCAN_PACKETS 32000
31 /* maximum size in which we look for synchronisation if
32 synchronisation is lost */
33 #define MAX_RESYNC_SIZE 4096
35 typedef struct PESContext PESContext;
37 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
38 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
39 extern void av_set_program_name(AVProgram *program, char *provider_name, char *name);
40 extern void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);
42 enum MpegTSFilterType {
47 typedef struct MpegTSFilter MpegTSFilter;
49 typedef void PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start);
51 typedef struct MpegTSPESFilter {
56 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
58 typedef void SetServiceCallback(void *opaque, int ret);
60 typedef struct MpegTSSectionFilter {
65 int end_of_section_reached:1;
66 SectionCallback *section_cb;
68 } MpegTSSectionFilter;
72 int last_cc; /* last cc code (-1 if first packet) */
73 enum MpegTSFilterType type;
75 MpegTSPESFilter pes_filter;
76 MpegTSSectionFilter section_filter;
80 #define MAX_PIDS_PER_PROGRAM 64
82 unsigned int id; //program id/service id
84 unsigned int pids[MAX_PIDS_PER_PROGRAM];
87 struct MpegTSContext {
89 AVFormatContext *stream;
90 /** raw packet size, including FEC if present */
92 /** if true, all pids are analyzed to find streams */
95 /** compute exact PCR for each transport stream packet */
96 int mpeg2ts_compute_pcr;
98 int64_t cur_pcr; /**< used to estimate the exact PCR */
99 int pcr_incr; /**< used to estimate the exact PCR */
101 /* data needed to handle file based ts */
102 /** stop parsing loop */
104 /** packet containing Audio/Video data */
107 /******************************************/
108 /* private mpegts data */
110 /** structure to keep track of Program->pids mapping */
115 /** filters for various streams specified by PMT + for the PAT and PMT */
116 MpegTSFilter *pids[NB_PID_MAX];
119 /* TS stream handling */
123 MPEGTS_PESHEADER_FILL,
128 /* enough for PES header + length */
129 #define PES_START_SIZE 9
130 #define MAX_PES_HEADER_SIZE (9 + 255)
134 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
137 AVFormatContext *stream;
139 enum MpegTSState state;
140 /* used to get the format */
145 uint8_t header[MAX_PES_HEADER_SIZE];
148 extern AVInputFormat mpegts_demuxer;
150 static void clear_program(MpegTSContext *ts, unsigned int programid)
154 for(i=0; i<ts->nb_prg; i++)
155 if(ts->prg[i].id == programid)
156 ts->prg[i].nb_pids = 0;
159 static void clear_programs(MpegTSContext *ts)
165 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
168 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(Program_t));
172 p = &ts->prg[ts->nb_prg];
178 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
182 for(i=0; i<ts->nb_prg; i++) {
183 if(ts->prg[i].id == programid) {
191 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
193 p->pids[p->nb_pids++] = pid;
197 * \brief discard_pid() decides if the pid is to be discarded according
198 * to caller's programs selection
199 * \param ts : - TS context
201 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
204 static int discard_pid(MpegTSContext *ts, unsigned int pid)
207 int used = 0, discarded = 0;
209 for(i=0; i<ts->nb_prg; i++) {
211 for(j=0; j<p->nb_pids; j++) {
212 if(p->pids[j] != pid)
214 //is program with id p->id set to be discarded?
215 for(k=0; k<ts->stream->nb_programs; k++) {
216 if(ts->stream->programs[k]->id == p->id) {
217 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
226 return (!used && discarded);
230 * Assembles PES packets out of TS packets, and then calls the "section_cb"
231 * function when they are complete.
233 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
234 const uint8_t *buf, int buf_size, int is_start)
236 MpegTSSectionFilter *tss = &tss1->u.section_filter;
240 memcpy(tss->section_buf, buf, buf_size);
241 tss->section_index = buf_size;
242 tss->section_h_size = -1;
243 tss->end_of_section_reached = 0;
245 if (tss->end_of_section_reached)
247 len = 4096 - tss->section_index;
250 memcpy(tss->section_buf + tss->section_index, buf, len);
251 tss->section_index += len;
254 /* compute section length if possible */
255 if (tss->section_h_size == -1 && tss->section_index >= 3) {
256 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
259 tss->section_h_size = len;
262 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
263 tss->end_of_section_reached = 1;
264 if (!tss->check_crc ||
265 av_crc(av_crc04C11DB7, -1, tss->section_buf, tss->section_h_size) == 0)
266 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
270 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
271 SectionCallback *section_cb, void *opaque,
275 MpegTSFilter *filter;
276 MpegTSSectionFilter *sec;
279 av_log(ts->stream, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid);
281 if (pid >= NB_PID_MAX || ts->pids[pid])
283 filter = av_mallocz(sizeof(MpegTSFilter));
286 ts->pids[pid] = filter;
287 filter->type = MPEGTS_SECTION;
289 filter->last_cc = -1;
290 sec = &filter->u.section_filter;
291 sec->section_cb = section_cb;
292 sec->opaque = opaque;
293 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
294 sec->check_crc = check_crc;
295 if (!sec->section_buf) {
302 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
306 MpegTSFilter *filter;
307 MpegTSPESFilter *pes;
309 if (pid >= NB_PID_MAX || ts->pids[pid])
311 filter = av_mallocz(sizeof(MpegTSFilter));
314 ts->pids[pid] = filter;
315 filter->type = MPEGTS_PES;
317 filter->last_cc = -1;
318 pes = &filter->u.pes_filter;
319 pes->pes_cb = pes_cb;
320 pes->opaque = opaque;
324 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
329 if (filter->type == MPEGTS_SECTION)
330 av_freep(&filter->u.section_filter.section_buf);
331 else if (filter->type == MPEGTS_PES)
332 av_freep(&filter->u.pes_filter.opaque);
335 ts->pids[pid] = NULL;
338 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
339 int stat[packet_size];
344 memset(stat, 0, packet_size*sizeof(int));
346 for(x=i=0; i<size; i++){
349 if(stat[x] > best_score){
356 if(x == packet_size) x= 0;
362 /* autodetect fec presence. Must have at least 1024 bytes */
363 static int get_packet_size(const uint8_t *buf, int size)
365 int score, fec_score, dvhs_score;
367 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
370 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
371 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
372 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
373 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
375 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
376 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
377 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
381 typedef struct SectionHeader {
386 uint8_t last_sec_num;
389 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
402 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
408 if ((p + 1) >= p_end)
416 /* read and allocate a DVB string preceeded by its length */
417 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
424 len = get8(&p, p_end);
427 if ((p + len) > p_end)
429 str = av_malloc(len + 1);
439 static int parse_section_header(SectionHeader *h,
440 const uint8_t **pp, const uint8_t *p_end)
444 val = get8(pp, p_end);
449 val = get16(pp, p_end);
453 val = get8(pp, p_end);
456 h->version = (val >> 1) & 0x1f;
457 val = get8(pp, p_end);
461 val = get8(pp, p_end);
464 h->last_sec_num = val;
469 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
471 MpegTSContext *ts = filter->u.section_filter.opaque;
472 SectionHeader h1, *h = &h1;
475 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
476 int program_info_length, pcr_pid, pid, stream_type;
477 int desc_list_len, desc_len, desc_tag;
478 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
479 char language[4] = {0}; /* initialize to kill warnings */
482 av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
483 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
485 p_end = section + section_len - 4;
487 if (parse_section_header(h, &p, p_end) < 0)
490 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
491 h->id, h->sec_num, h->last_sec_num);
493 if (h->tid != PMT_TID)
496 clear_program(ts, h->id);
497 pcr_pid = get16(&p, p_end) & 0x1fff;
500 add_pid_to_pmt(ts, h->id, pcr_pid);
502 av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
504 program_info_length = get16(&p, p_end) & 0xfff;
505 if (program_info_length < 0)
507 p += program_info_length;
513 stream_type = get8(&p, p_end);
516 pid = get16(&p, p_end) & 0x1fff;
519 desc_list_len = get16(&p, p_end) & 0xfff;
520 if (desc_list_len < 0)
522 desc_list_end = p + desc_list_len;
523 if (desc_list_end > p_end)
526 desc_tag = get8(&p, desc_list_end);
529 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
530 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
531 /*assume DVB AC-3 Audio*/
532 stream_type = STREAM_TYPE_AUDIO_AC3;
533 } else if(desc_tag == 0x7B) {
535 stream_type = STREAM_TYPE_AUDIO_DTS;
538 desc_len = get8(&p, desc_list_end);
539 desc_end = p + desc_len;
540 if (desc_end > desc_list_end)
543 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
547 case DVB_SUBT_DESCID:
548 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
549 stream_type = STREAM_TYPE_SUBTITLE_DVB;
551 language[0] = get8(&p, desc_end);
552 language[1] = get8(&p, desc_end);
553 language[2] = get8(&p, desc_end);
556 comp_page = get16(&p, desc_end);
557 anc_page = get16(&p, desc_end);
560 case 0x0a: /* ISO 639 language descriptor */
561 language[0] = get8(&p, desc_end);
562 language[1] = get8(&p, desc_end);
563 language[2] = get8(&p, desc_end);
574 av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
578 /* now create ffmpeg stream */
579 switch(stream_type) {
580 case STREAM_TYPE_AUDIO_MPEG1:
581 case STREAM_TYPE_AUDIO_MPEG2:
582 case STREAM_TYPE_VIDEO_MPEG1:
583 case STREAM_TYPE_VIDEO_MPEG2:
584 case STREAM_TYPE_VIDEO_MPEG4:
585 case STREAM_TYPE_VIDEO_H264:
586 case STREAM_TYPE_VIDEO_VC1:
587 case STREAM_TYPE_AUDIO_AAC:
588 case STREAM_TYPE_AUDIO_AC3:
589 case STREAM_TYPE_AUDIO_DTS:
590 case STREAM_TYPE_SUBTITLE_DVB:
591 if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
592 pes= ts->pids[pid]->u.pes_filter.opaque;
595 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
596 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
598 st = new_pes_av_stream(pes, 0);
600 add_pid_to_pmt(ts, h->id, pid);
602 av_program_add_stream_index(ts->stream, h->id, st->index);
605 /* we ignore the other streams */
610 if (language[0] != 0) {
611 memcpy(st->language, language, 4);
614 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
615 st->codec->sub_id = (anc_page << 16) | comp_page;
619 /* all parameters are there */
621 mpegts_close_filter(ts, filter);
624 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
626 MpegTSContext *ts = filter->u.section_filter.opaque;
627 SectionHeader h1, *h = &h1;
628 const uint8_t *p, *p_end;
632 av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
633 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
635 p_end = section + section_len - 4;
637 if (parse_section_header(h, &p, p_end) < 0)
639 if (h->tid != PAT_TID)
644 sid = get16(&p, p_end);
647 pmt_pid = get16(&p, p_end) & 0x1fff;
651 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
656 av_new_program(ts->stream, sid);
658 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
659 add_pat_entry(ts, sid);
660 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
661 add_pid_to_pmt(ts, sid, pmt_pid);
667 mpegts_close_filter(ts, filter);
670 static void mpegts_set_service(MpegTSContext *ts)
672 mpegts_open_section_filter(ts, PAT_PID,
676 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
678 MpegTSContext *ts = filter->u.section_filter.opaque;
679 SectionHeader h1, *h = &h1;
680 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
681 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
682 char *name, *provider_name;
685 av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
686 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
689 p_end = section + section_len - 4;
691 if (parse_section_header(h, &p, p_end) < 0)
693 if (h->tid != SDT_TID)
695 onid = get16(&p, p_end);
698 val = get8(&p, p_end);
702 sid = get16(&p, p_end);
705 val = get8(&p, p_end);
708 desc_list_len = get16(&p, p_end) & 0xfff;
709 if (desc_list_len < 0)
711 desc_list_end = p + desc_list_len;
712 if (desc_list_end > p_end)
715 desc_tag = get8(&p, desc_list_end);
718 desc_len = get8(&p, desc_list_end);
719 desc_end = p + desc_len;
720 if (desc_end > desc_list_end)
723 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
728 service_type = get8(&p, p_end);
729 if (service_type < 0)
731 provider_name = getstr8(&p, p_end);
734 name = getstr8(&p, p_end);
736 AVProgram *program = av_new_program(ts->stream, sid);
738 av_set_program_name(program, provider_name, name);
750 /* scan services in a transport stream by looking at the SDT */
751 static void mpegts_scan_sdt(MpegTSContext *ts)
753 mpegts_open_section_filter(ts, SDT_PID,
757 static int64_t get_pts(const uint8_t *p)
759 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
760 pts |= (AV_RB16(p + 1) >> 1) << 15;
761 pts |= AV_RB16(p + 3) >> 1;
765 /* return non zero if a packet could be constructed */
766 static void mpegts_push_data(MpegTSFilter *filter,
767 const uint8_t *buf, int buf_size, int is_start)
769 PESContext *pes = filter->u.pes_filter.opaque;
770 MpegTSContext *ts = pes->ts;
778 pes->state = MPEGTS_HEADER;
782 while (buf_size > 0) {
785 len = PES_START_SIZE - pes->data_index;
788 memcpy(pes->header + pes->data_index, p, len);
789 pes->data_index += len;
792 if (pes->data_index == PES_START_SIZE) {
793 /* we got all the PES or section header. We can now
796 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
798 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
799 pes->header[2] == 0x01) {
800 /* it must be an mpeg2 PES stream */
801 code = pes->header[3] | 0x100;
802 if (!((code >= 0x1c0 && code <= 0x1df) ||
803 (code >= 0x1e0 && code <= 0x1ef) ||
804 (code == 0x1bd) || (code == 0x1fd)))
807 /* allocate stream */
808 new_pes_av_stream(pes, code);
810 pes->state = MPEGTS_PESHEADER_FILL;
811 pes->total_size = AV_RB16(pes->header + 4);
812 /* NOTE: a zero total size means the PES size is
815 pes->total_size += 6;
816 pes->pes_header_size = pes->header[8] + 9;
818 /* otherwise, it should be a table */
821 pes->state = MPEGTS_SKIP;
826 /**********************************************/
827 /* PES packing parsing */
828 case MPEGTS_PESHEADER_FILL:
829 len = pes->pes_header_size - pes->data_index;
832 memcpy(pes->header + pes->data_index, p, len);
833 pes->data_index += len;
836 if (pes->data_index == pes->pes_header_size) {
840 flags = pes->header[7];
842 pes->pts = AV_NOPTS_VALUE;
843 pes->dts = AV_NOPTS_VALUE;
844 if ((flags & 0xc0) == 0x80) {
845 pes->pts = get_pts(r);
847 } else if ((flags & 0xc0) == 0xc0) {
848 pes->pts = get_pts(r);
850 pes->dts = get_pts(r);
853 /* we got the full header. We parse it and get the payload */
854 pes->state = MPEGTS_PAYLOAD;
858 if (pes->total_size) {
859 len = pes->total_size - pes->data_index;
866 AVPacket *pkt = ts->pkt;
867 if (pes->st && av_new_packet(pkt, len) == 0) {
868 memcpy(pkt->data, p, len);
869 pkt->stream_index = pes->st->index;
872 /* reset pts values */
873 pes->pts = AV_NOPTS_VALUE;
874 pes->dts = AV_NOPTS_VALUE;
888 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
891 int codec_type, codec_id;
893 switch(pes->stream_type){
894 case STREAM_TYPE_AUDIO_MPEG1:
895 case STREAM_TYPE_AUDIO_MPEG2:
896 codec_type = CODEC_TYPE_AUDIO;
897 codec_id = CODEC_ID_MP3;
899 case STREAM_TYPE_VIDEO_MPEG1:
900 case STREAM_TYPE_VIDEO_MPEG2:
901 codec_type = CODEC_TYPE_VIDEO;
902 codec_id = CODEC_ID_MPEG2VIDEO;
904 case STREAM_TYPE_VIDEO_MPEG4:
905 codec_type = CODEC_TYPE_VIDEO;
906 codec_id = CODEC_ID_MPEG4;
908 case STREAM_TYPE_VIDEO_H264:
909 codec_type = CODEC_TYPE_VIDEO;
910 codec_id = CODEC_ID_H264;
912 case STREAM_TYPE_VIDEO_VC1:
913 codec_type = CODEC_TYPE_VIDEO;
914 codec_id = CODEC_ID_VC1;
916 case STREAM_TYPE_AUDIO_AAC:
917 codec_type = CODEC_TYPE_AUDIO;
918 codec_id = CODEC_ID_AAC;
920 case STREAM_TYPE_AUDIO_AC3:
921 codec_type = CODEC_TYPE_AUDIO;
922 codec_id = CODEC_ID_AC3;
924 case STREAM_TYPE_AUDIO_DTS:
925 codec_type = CODEC_TYPE_AUDIO;
926 codec_id = CODEC_ID_DTS;
928 case STREAM_TYPE_SUBTITLE_DVB:
929 codec_type = CODEC_TYPE_SUBTITLE;
930 codec_id = CODEC_ID_DVB_SUBTITLE;
933 if (code >= 0x1c0 && code <= 0x1df) {
934 codec_type = CODEC_TYPE_AUDIO;
935 codec_id = CODEC_ID_MP2;
936 } else if (code == 0x1bd) {
937 codec_type = CODEC_TYPE_AUDIO;
938 codec_id = CODEC_ID_AC3;
940 codec_type = CODEC_TYPE_VIDEO;
941 codec_id = CODEC_ID_MPEG1VIDEO;
945 st = av_new_stream(pes->stream, pes->pid);
947 av_set_pts_info(st, 33, 1, 90000);
949 st->codec->codec_type = codec_type;
950 st->codec->codec_id = codec_id;
951 st->need_parsing = AVSTREAM_PARSE_FULL;
958 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
963 /* if no pid found, then add a pid context */
964 pes = av_mallocz(sizeof(PESContext));
968 pes->stream = ts->stream;
970 pes->pcr_pid = pcr_pid;
971 pes->stream_type = stream_type;
972 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
980 /* handle one TS packet */
981 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
983 AVFormatContext *s = ts->stream;
985 int len, pid, cc, cc_ok, afc, is_start;
986 const uint8_t *p, *p_end;
988 pid = AV_RB16(packet + 1) & 0x1fff;
989 if(pid && discard_pid(ts, pid))
991 is_start = packet[1] & 0x40;
993 if (ts->auto_guess && tss == NULL && is_start) {
994 add_pes_stream(ts, pid, -1, 0);
1000 /* continuity check (currently not used) */
1001 cc = (packet[3] & 0xf);
1002 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1005 /* skip adaptation field */
1006 afc = (packet[3] >> 4) & 3;
1008 if (afc == 0) /* reserved value */
1010 if (afc == 2) /* adaptation field only */
1013 /* skip adapation field */
1016 /* if past the end of packet, ignore */
1017 p_end = packet + TS_PACKET_SIZE;
1021 if (tss->type == MPEGTS_SECTION) {
1023 /* pointer field present */
1025 if (p + len > p_end)
1028 /* write remaining section bytes */
1029 write_section_data(s, tss,
1031 /* check whether filter has been closed */
1037 write_section_data(s, tss,
1042 write_section_data(s, tss,
1047 tss->u.pes_filter.pes_cb(tss,
1048 p, p_end - p, is_start);
1052 /* XXX: try to find a better synchro over several packets (use
1053 get_packet_size() ?) */
1054 static int mpegts_resync(ByteIOContext *pb)
1058 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1063 url_fseek(pb, -1, SEEK_CUR);
1071 /* return -1 if error or EOF. Return 0 if OK. */
1072 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1077 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1078 if (len != TS_PACKET_SIZE)
1079 return AVERROR(EIO);
1080 /* check paquet sync byte */
1081 if (buf[0] != 0x47) {
1082 /* find a new packet start */
1083 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1084 if (mpegts_resync(pb) < 0)
1085 return AVERROR_INVALIDDATA;
1089 skip = raw_packet_size - TS_PACKET_SIZE;
1091 url_fskip(pb, skip);
1098 static int handle_packets(MpegTSContext *ts, int nb_packets)
1100 AVFormatContext *s = ts->stream;
1101 ByteIOContext *pb = &s->pb;
1102 uint8_t packet[TS_PACKET_SIZE];
1103 int packet_num, ret;
1108 if (ts->stop_parse>0)
1111 if (nb_packets != 0 && packet_num >= nb_packets)
1113 ret = read_packet(pb, packet, ts->raw_packet_size);
1116 handle_packet(ts, packet);
1121 static int mpegts_probe(AVProbeData *p)
1124 const int size= p->buf_size;
1125 int score, fec_score, dvhs_score;
1126 #define CHECK_COUNT 10
1128 if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))
1131 score = analyze(p->buf, TS_PACKET_SIZE *CHECK_COUNT, TS_PACKET_SIZE, NULL);
1132 dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);
1133 fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);
1134 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1136 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1137 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1138 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1139 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1142 /* only use the extension for safer guess */
1143 if (match_ext(p->filename, "ts"))
1144 return AVPROBE_SCORE_MAX;
1150 /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return
1151 (-1) if not available */
1152 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1153 const uint8_t *packet)
1155 int afc, len, flags;
1159 afc = (packet[3] >> 4) & 3;
1169 if (!(flags & 0x10))
1174 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1175 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1179 static int mpegts_read_header(AVFormatContext *s,
1180 AVFormatParameters *ap)
1182 MpegTSContext *ts = s->priv_data;
1183 ByteIOContext *pb = &s->pb;
1189 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1190 if(ap->mpeg2ts_raw){
1191 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1196 /* read the first 1024 bytes to get packet size */
1197 pos = url_ftell(pb);
1198 len = get_buffer(pb, buf, sizeof(buf));
1199 if (len != sizeof(buf))
1201 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1202 if (ts->raw_packet_size <= 0)
1207 if (s->iformat == &mpegts_demuxer) {
1210 /* first do a scaning to get all the services */
1211 url_fseek(pb, pos, SEEK_SET);
1212 mpegts_scan_sdt(ts);
1214 mpegts_set_service(ts);
1216 handle_packets(ts, s->probesize);
1217 /* if could not find service, enable auto_guess */
1222 av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
1224 s->ctx_flags |= AVFMTCTX_NOHEADER;
1227 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1228 int64_t pcrs[2], pcr_h;
1229 int packet_count[2];
1230 uint8_t packet[TS_PACKET_SIZE];
1232 /* only read packets */
1234 st = av_new_stream(s, 0);
1237 av_set_pts_info(st, 60, 1, 27000000);
1238 st->codec->codec_type = CODEC_TYPE_DATA;
1239 st->codec->codec_id = CODEC_ID_MPEG2TS;
1241 /* we iterate until we find two PCRs to estimate the bitrate */
1246 ret = read_packet(&s->pb, packet, ts->raw_packet_size);
1249 pid = AV_RB16(packet + 1) & 0x1fff;
1250 if ((pcr_pid == -1 || pcr_pid == pid) &&
1251 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1253 packet_count[nb_pcrs] = nb_packets;
1254 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1262 /* NOTE1: the bitrate is computed without the FEC */
1263 /* NOTE2: it is only the bitrate of the start of the stream */
1264 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1265 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1266 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1267 st->codec->bit_rate = s->bit_rate;
1268 st->start_time = ts->cur_pcr;
1270 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1271 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1275 url_fseek(pb, pos, SEEK_SET);
1281 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1283 static int mpegts_raw_read_packet(AVFormatContext *s,
1286 MpegTSContext *ts = s->priv_data;
1288 int64_t pcr_h, next_pcr_h, pos;
1289 int pcr_l, next_pcr_l;
1290 uint8_t pcr_buf[12];
1292 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1293 return AVERROR(ENOMEM);
1294 pkt->pos= url_ftell(&s->pb);
1295 ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size);
1297 av_free_packet(pkt);
1300 if (ts->mpeg2ts_compute_pcr) {
1301 /* compute exact PCR for each packet */
1302 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1303 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1304 pos = url_ftell(&s->pb);
1305 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1306 url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1307 get_buffer(&s->pb, pcr_buf, 12);
1308 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1309 /* XXX: not precise enough */
1310 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1315 url_fseek(&s->pb, pos, SEEK_SET);
1316 /* no next PCR found: we use previous increment */
1317 ts->cur_pcr = pcr_h * 300 + pcr_l;
1319 pkt->pts = ts->cur_pcr;
1320 pkt->duration = ts->pcr_incr;
1321 ts->cur_pcr += ts->pcr_incr;
1323 pkt->stream_index = 0;
1327 static int mpegts_read_packet(AVFormatContext *s,
1330 MpegTSContext *ts = s->priv_data;
1333 return handle_packets(ts, 0);
1336 static int mpegts_read_close(AVFormatContext *s)
1338 MpegTSContext *ts = s->priv_data;
1340 for(i=0;i<NB_PID_MAX;i++)
1341 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1346 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1347 int64_t *ppos, int64_t pos_limit)
1349 MpegTSContext *ts = s->priv_data;
1350 int64_t pos, timestamp;
1351 uint8_t buf[TS_PACKET_SIZE];
1352 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1353 const int find_next= 1;
1354 pos = ((*ppos + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size;
1357 url_fseek(&s->pb, pos, SEEK_SET);
1358 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1359 return AV_NOPTS_VALUE;
1360 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1361 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1364 pos += ts->raw_packet_size;
1368 pos -= ts->raw_packet_size;
1370 return AV_NOPTS_VALUE;
1371 url_fseek(&s->pb, pos, SEEK_SET);
1372 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1373 return AV_NOPTS_VALUE;
1374 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1375 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1385 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1386 MpegTSContext *ts = s->priv_data;
1387 uint8_t buf[TS_PACKET_SIZE];
1390 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1393 pos= url_ftell(&s->pb);
1396 url_fseek(&s->pb, pos, SEEK_SET);
1397 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1399 // pid = AV_RB16(buf + 1) & 0x1fff;
1400 if(buf[1] & 0x40) break;
1401 pos += ts->raw_packet_size;
1403 url_fseek(&s->pb, pos, SEEK_SET);
1408 /**************************************************************/
1409 /* parsing functions - called from other demuxers such as RTP */
1411 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1415 ts = av_mallocz(sizeof(MpegTSContext));
1418 /* no stream case, currently used by RTP */
1419 ts->raw_packet_size = TS_PACKET_SIZE;
1425 /* return the consumed length if a packet was output, or -1 if no
1427 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1428 const uint8_t *buf, int len)
1436 if (ts->stop_parse>0)
1438 if (len < TS_PACKET_SIZE)
1440 if (buf[0] != 0x47) {
1444 handle_packet(ts, buf);
1445 buf += TS_PACKET_SIZE;
1446 len -= TS_PACKET_SIZE;
1452 void mpegts_parse_close(MpegTSContext *ts)
1456 for(i=0;i<NB_PID_MAX;i++)
1457 av_free(ts->pids[i]);
1461 AVInputFormat mpegts_demuxer = {
1463 "MPEG2 transport stream format",
1464 sizeof(MpegTSContext),
1471 .flags = AVFMT_SHOW_IDS,
1474 AVInputFormat mpegtsraw_demuxer = {
1476 "MPEG2 raw transport stream format",
1477 sizeof(MpegTSContext),
1480 mpegts_raw_read_packet,
1484 .flags = AVFMT_SHOW_IDS,