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
24 #include "allformats.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
36 typedef struct PESContext PESContext;
38 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int stream_type);
39 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
41 enum MpegTSFilterType {
46 typedef void PESCallback(void *opaque, const uint8_t *buf, int len, int is_start);
48 typedef struct MpegTSPESFilter {
53 typedef void SectionCallback(void *opaque, const uint8_t *buf, int len);
55 typedef void SetServiceCallback(void *opaque, int ret);
57 typedef struct MpegTSSectionFilter {
62 int end_of_section_reached:1;
63 SectionCallback *section_cb;
65 } MpegTSSectionFilter;
67 typedef struct MpegTSFilter {
69 int last_cc; /* last cc code (-1 if first packet) */
70 enum MpegTSFilterType type;
72 MpegTSPESFilter pes_filter;
73 MpegTSSectionFilter section_filter;
77 typedef struct MpegTSService {
79 int sid; /**< MPEG Program Number of stream */
80 char *provider_name; /**< DVB Network name, "" if not DVB stream */
81 char *name; /**< DVB Service name, "MPEG Program [sid]" if not DVB stream*/
84 struct MpegTSContext {
86 AVFormatContext *stream;
87 /** raw packet size, including FEC if present */
89 /** if true, all pids are analyzed to find streams */
92 /** compute exact PCR for each transport stream packet */
93 int mpeg2ts_compute_pcr;
95 int64_t cur_pcr; /**< used to estimate the exact PCR */
96 int pcr_incr; /**< used to estimate the exact PCR */
97 int pcr_pid; /**< used to estimate the exact PCR */
99 /* data needed to handle file based ts */
100 /** stop parsing loop */
102 /** packet containing Audio/Video data */
105 /******************************************/
106 /* private mpegts data */
108 /** number of PMTs in the last PAT seen */
110 /** list of PMTs in the last PAT seen */
111 MpegTSService **services;
113 /** filter for the PAT */
114 MpegTSFilter *pat_filter;
115 /** filter for the PMT for the MPEG program number specified by req_sid */
116 MpegTSFilter *pmt_filter;
117 /** MPEG program number of stream we want to decode */
120 /** filters for various streams specified by PMT + for the PAT and PMT */
121 MpegTSFilter *pids[NB_PID_MAX];
125 * Assembles PES packets out of TS packets, and then calls the "section_cb"
126 * function when they are complete.
128 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
129 const uint8_t *buf, int buf_size, int is_start)
131 MpegTSSectionFilter *tss = &tss1->u.section_filter;
135 memcpy(tss->section_buf, buf, buf_size);
136 tss->section_index = buf_size;
137 tss->section_h_size = -1;
138 tss->end_of_section_reached = 0;
140 if (tss->end_of_section_reached)
142 len = 4096 - tss->section_index;
145 memcpy(tss->section_buf + tss->section_index, buf, len);
146 tss->section_index += len;
149 /* compute section length if possible */
150 if (tss->section_h_size == -1 && tss->section_index >= 3) {
151 len = (((tss->section_buf[1] & 0xf) << 8) | tss->section_buf[2]) + 3;
154 tss->section_h_size = len;
157 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
158 tss->end_of_section_reached = 1;
159 if (!tss->check_crc ||
160 av_crc(av_crc04C11DB7, -1, tss->section_buf, tss->section_h_size) == 0)
161 tss->section_cb(tss->opaque, tss->section_buf, tss->section_h_size);
165 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
166 SectionCallback *section_cb, void *opaque,
170 MpegTSFilter *filter;
171 MpegTSSectionFilter *sec;
174 av_log(ts->stream, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid);
176 if (pid >= NB_PID_MAX || ts->pids[pid])
178 filter = av_mallocz(sizeof(MpegTSFilter));
181 ts->pids[pid] = filter;
182 filter->type = MPEGTS_SECTION;
184 filter->last_cc = -1;
185 sec = &filter->u.section_filter;
186 sec->section_cb = section_cb;
187 sec->opaque = opaque;
188 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
189 sec->check_crc = check_crc;
190 if (!sec->section_buf) {
197 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
201 MpegTSFilter *filter;
202 MpegTSPESFilter *pes;
204 if (pid >= NB_PID_MAX || ts->pids[pid])
206 filter = av_mallocz(sizeof(MpegTSFilter));
209 ts->pids[pid] = filter;
210 filter->type = MPEGTS_PES;
212 filter->last_cc = -1;
213 pes = &filter->u.pes_filter;
214 pes->pes_cb = pes_cb;
215 pes->opaque = opaque;
219 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
224 if (filter->type == MPEGTS_SECTION)
225 av_freep(&filter->u.section_filter.section_buf);
226 else if (filter->type == MPEGTS_PES)
227 av_freep(&filter->u.pes_filter.opaque);
230 ts->pids[pid] = NULL;
233 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
234 int stat[packet_size];
239 memset(stat, 0, packet_size*sizeof(int));
241 for(x=i=0; i<size; i++){
244 if(stat[x] > best_score){
251 if(x == packet_size) x= 0;
257 /* autodetect fec presence. Must have at least 1024 bytes */
258 static int get_packet_size(const uint8_t *buf, int size)
260 int score, fec_score, dvhs_score;
262 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
265 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
266 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
267 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
268 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
270 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
271 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
272 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
276 typedef struct SectionHeader {
281 uint8_t last_sec_num;
284 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
297 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
303 if ((p + 1) >= p_end)
305 c = (p[0] << 8) | p[1];
311 /* read and allocate a DVB string preceeded by its length */
312 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
319 len = get8(&p, p_end);
322 if ((p + len) > p_end)
324 str = av_malloc(len + 1);
334 static int parse_section_header(SectionHeader *h,
335 const uint8_t **pp, const uint8_t *p_end)
339 val = get8(pp, p_end);
344 val = get16(pp, p_end);
348 val = get8(pp, p_end);
351 h->version = (val >> 1) & 0x1f;
352 val = get8(pp, p_end);
356 val = get8(pp, p_end);
359 h->last_sec_num = val;
363 static MpegTSService *new_service(MpegTSContext *ts, int sid,
364 char *provider_name, char *name)
366 MpegTSService *service=NULL;
370 av_log(ts->stream, AV_LOG_DEBUG, "new_service: "
371 "sid=0x%04x provider='%s' name='%s'\n",
372 sid, provider_name, name);
375 for(i=0; i<ts->nb_services; i++)
376 if(ts->services[i]->sid == sid)
377 service= ts->services[i];
380 service = av_mallocz(sizeof(MpegTSService));
383 dynarray_add(&ts->services, &ts->nb_services, service);
386 assert((!provider_name) == (!name));
388 av_free(service->provider_name);
389 av_free(service-> name);
390 service->provider_name = provider_name;
391 service-> name = name;
396 static void pmt_cb(void *opaque, const uint8_t *section, int section_len)
398 MpegTSContext *ts = opaque;
399 SectionHeader h1, *h = &h1;
402 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
403 int program_info_length, pcr_pid, pid, stream_type;
404 int desc_list_len, desc_len, desc_tag;
405 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
406 char language[4] = {0}; /* initialize to kill warnings */
409 av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
410 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
412 p_end = section + section_len - 4;
414 if (parse_section_header(h, &p, p_end) < 0)
417 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
418 h->id, h->sec_num, h->last_sec_num);
420 if (h->tid != PMT_TID || (ts->req_sid >= 0 && h->id != ts->req_sid) )
423 pcr_pid = get16(&p, p_end) & 0x1fff;
426 ts->pcr_pid = pcr_pid;
428 av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
430 program_info_length = get16(&p, p_end) & 0xfff;
431 if (program_info_length < 0)
433 p += program_info_length;
439 stream_type = get8(&p, p_end);
442 pid = get16(&p, p_end) & 0x1fff;
445 desc_list_len = get16(&p, p_end) & 0xfff;
446 if (desc_list_len < 0)
448 desc_list_end = p + desc_list_len;
449 if (desc_list_end > p_end)
452 desc_tag = get8(&p, desc_list_end);
455 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
456 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
457 /*assume DVB AC-3 Audio*/
458 stream_type = STREAM_TYPE_AUDIO_AC3;
459 } else if(desc_tag == 0x7B) {
461 stream_type = STREAM_TYPE_AUDIO_DTS;
464 desc_len = get8(&p, desc_list_end);
465 desc_end = p + desc_len;
466 if (desc_end > desc_list_end)
469 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
473 case DVB_SUBT_DESCID:
474 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
475 stream_type = STREAM_TYPE_SUBTITLE_DVB;
477 language[0] = get8(&p, desc_end);
478 language[1] = get8(&p, desc_end);
479 language[2] = get8(&p, desc_end);
482 comp_page = get16(&p, desc_end);
483 anc_page = get16(&p, desc_end);
486 case 0x0a: /* ISO 639 language descriptor */
487 language[0] = get8(&p, desc_end);
488 language[1] = get8(&p, desc_end);
489 language[2] = get8(&p, desc_end);
500 av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
504 /* now create ffmpeg stream */
505 switch(stream_type) {
506 case STREAM_TYPE_AUDIO_MPEG1:
507 case STREAM_TYPE_AUDIO_MPEG2:
508 case STREAM_TYPE_VIDEO_MPEG1:
509 case STREAM_TYPE_VIDEO_MPEG2:
510 case STREAM_TYPE_VIDEO_MPEG4:
511 case STREAM_TYPE_VIDEO_H264:
512 case STREAM_TYPE_VIDEO_VC1:
513 case STREAM_TYPE_AUDIO_AAC:
514 case STREAM_TYPE_AUDIO_AC3:
515 case STREAM_TYPE_AUDIO_DTS:
516 case STREAM_TYPE_SUBTITLE_DVB:
517 pes = add_pes_stream(ts, pid, stream_type);
519 st = new_pes_av_stream(pes, 0);
522 /* we ignore the other streams */
527 if (language[0] != 0) {
528 st->language[0] = language[0];
529 st->language[1] = language[1];
530 st->language[2] = language[2];
531 st->language[3] = language[3];
534 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
535 st->codec->sub_id = (anc_page << 16) | comp_page;
539 /* all parameters are there */
541 mpegts_close_filter(ts, ts->pmt_filter);
542 ts->pmt_filter = NULL;
545 static void pat_cb(void *opaque, const uint8_t *section, int section_len)
547 MpegTSContext *ts = opaque;
548 SectionHeader h1, *h = &h1;
549 const uint8_t *p, *p_end;
553 av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
554 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
556 p_end = section + section_len - 4;
558 if (parse_section_header(h, &p, p_end) < 0)
560 if (h->tid != PAT_TID)
564 sid = get16(&p, p_end);
567 pmt_pid = get16(&p, p_end) & 0x1fff;
571 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
576 if (ts->req_sid == sid) {
577 ts->pmt_filter = mpegts_open_section_filter(ts, pmt_pid,
587 mpegts_close_filter(ts, ts->pat_filter);
588 ts->pat_filter = NULL;
591 /* add all services found in the PAT */
592 static void pat_scan_cb(void *opaque, const uint8_t *section, int section_len)
594 MpegTSContext *ts = opaque;
595 SectionHeader h1, *h = &h1;
596 const uint8_t *p, *p_end;
600 av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
601 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
603 p_end = section + section_len - 4;
605 if (parse_section_header(h, &p, p_end) < 0)
607 if (h->tid != PAT_TID)
611 sid = get16(&p, p_end);
614 pmt_pid = get16(&p, p_end) & 0x1fff;
618 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
623 new_service(ts, sid, NULL, NULL);
629 mpegts_close_filter(ts, ts->pat_filter);
630 ts->pat_filter = NULL;
633 static void mpegts_set_service(MpegTSContext *ts, int sid)
636 ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
640 static void sdt_cb(void *opaque, const uint8_t *section, int section_len)
642 MpegTSContext *ts = opaque;
643 SectionHeader h1, *h = &h1;
644 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
645 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
646 char *name, *provider_name;
649 av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
650 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
653 p_end = section + section_len - 4;
655 if (parse_section_header(h, &p, p_end) < 0)
657 if (h->tid != SDT_TID)
659 onid = get16(&p, p_end);
662 val = get8(&p, p_end);
666 sid = get16(&p, p_end);
669 val = get8(&p, p_end);
672 desc_list_len = get16(&p, p_end) & 0xfff;
673 if (desc_list_len < 0)
675 desc_list_end = p + desc_list_len;
676 if (desc_list_end > p_end)
679 desc_tag = get8(&p, desc_list_end);
682 desc_len = get8(&p, desc_list_end);
683 desc_end = p + desc_len;
684 if (desc_end > desc_list_end)
687 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
692 service_type = get8(&p, p_end);
693 if (service_type < 0)
695 provider_name = getstr8(&p, p_end);
698 name = getstr8(&p, p_end);
701 new_service(ts, sid, provider_name, name);
712 /* scan services in a transport stream by looking at the SDT */
713 static void mpegts_scan_sdt(MpegTSContext *ts)
715 mpegts_open_section_filter(ts, SDT_PID,
719 /* scan services in a transport stream by looking at the PAT (better
721 static void mpegts_scan_pat(MpegTSContext *ts)
723 ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
727 /* TS stream handling */
731 MPEGTS_PESHEADER_FILL,
736 /* enough for PES header + length */
737 #define PES_START_SIZE 9
738 #define MAX_PES_HEADER_SIZE (9 + 255)
744 AVFormatContext *stream;
746 enum MpegTSState state;
747 /* used to get the format */
752 uint8_t header[MAX_PES_HEADER_SIZE];
755 static int64_t get_pts(const uint8_t *p)
760 pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
761 val = (p[1] << 8) | p[2];
762 pts |= (int64_t)(val >> 1) << 15;
763 val = (p[3] << 8) | p[4];
764 pts |= (int64_t)(val >> 1);
768 /* return non zero if a packet could be constructed */
769 static void mpegts_push_data(void *opaque,
770 const uint8_t *buf, int buf_size, int is_start)
772 PESContext *pes = opaque;
773 MpegTSContext *ts = pes->ts;
781 pes->state = MPEGTS_HEADER;
785 while (buf_size > 0) {
788 len = PES_START_SIZE - pes->data_index;
791 memcpy(pes->header + pes->data_index, p, len);
792 pes->data_index += len;
795 if (pes->data_index == PES_START_SIZE) {
796 /* we got all the PES or section header. We can now
799 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
801 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
802 pes->header[2] == 0x01) {
803 /* it must be an mpeg2 PES stream */
804 code = pes->header[3] | 0x100;
805 if (!((code >= 0x1c0 && code <= 0x1df) ||
806 (code >= 0x1e0 && code <= 0x1ef) ||
807 (code == 0x1bd) || (code == 0x1fd)))
810 /* allocate stream */
811 new_pes_av_stream(pes, code);
813 pes->state = MPEGTS_PESHEADER_FILL;
814 pes->total_size = (pes->header[4] << 8) | pes->header[5];
815 /* NOTE: a zero total size means the PES size is
818 pes->total_size += 6;
819 pes->pes_header_size = pes->header[8] + 9;
821 /* otherwise, it should be a table */
824 pes->state = MPEGTS_SKIP;
829 /**********************************************/
830 /* PES packing parsing */
831 case MPEGTS_PESHEADER_FILL:
832 len = pes->pes_header_size - pes->data_index;
835 memcpy(pes->header + pes->data_index, p, len);
836 pes->data_index += len;
839 if (pes->data_index == pes->pes_header_size) {
843 flags = pes->header[7];
845 pes->pts = AV_NOPTS_VALUE;
846 pes->dts = AV_NOPTS_VALUE;
847 if ((flags & 0xc0) == 0x80) {
848 pes->pts = get_pts(r);
850 } else if ((flags & 0xc0) == 0xc0) {
851 pes->pts = get_pts(r);
853 pes->dts = get_pts(r);
856 /* we got the full header. We parse it and get the payload */
857 pes->state = MPEGTS_PAYLOAD;
861 if (pes->total_size) {
862 len = pes->total_size - pes->data_index;
869 AVPacket *pkt = ts->pkt;
870 if (pes->st && av_new_packet(pkt, len) == 0) {
871 memcpy(pkt->data, p, len);
872 pkt->stream_index = pes->st->index;
875 /* reset pts values */
876 pes->pts = AV_NOPTS_VALUE;
877 pes->dts = AV_NOPTS_VALUE;
891 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
894 int codec_type, codec_id;
896 switch(pes->stream_type){
897 case STREAM_TYPE_AUDIO_MPEG1:
898 case STREAM_TYPE_AUDIO_MPEG2:
899 codec_type = CODEC_TYPE_AUDIO;
900 codec_id = CODEC_ID_MP3;
902 case STREAM_TYPE_VIDEO_MPEG1:
903 case STREAM_TYPE_VIDEO_MPEG2:
904 codec_type = CODEC_TYPE_VIDEO;
905 codec_id = CODEC_ID_MPEG2VIDEO;
907 case STREAM_TYPE_VIDEO_MPEG4:
908 codec_type = CODEC_TYPE_VIDEO;
909 codec_id = CODEC_ID_MPEG4;
911 case STREAM_TYPE_VIDEO_H264:
912 codec_type = CODEC_TYPE_VIDEO;
913 codec_id = CODEC_ID_H264;
915 case STREAM_TYPE_VIDEO_VC1:
916 codec_type = CODEC_TYPE_VIDEO;
917 codec_id = CODEC_ID_VC1;
919 case STREAM_TYPE_AUDIO_AAC:
920 codec_type = CODEC_TYPE_AUDIO;
921 codec_id = CODEC_ID_AAC;
923 case STREAM_TYPE_AUDIO_AC3:
924 codec_type = CODEC_TYPE_AUDIO;
925 codec_id = CODEC_ID_AC3;
927 case STREAM_TYPE_AUDIO_DTS:
928 codec_type = CODEC_TYPE_AUDIO;
929 codec_id = CODEC_ID_DTS;
931 case STREAM_TYPE_SUBTITLE_DVB:
932 codec_type = CODEC_TYPE_SUBTITLE;
933 codec_id = CODEC_ID_DVB_SUBTITLE;
936 if (code >= 0x1c0 && code <= 0x1df) {
937 codec_type = CODEC_TYPE_AUDIO;
938 codec_id = CODEC_ID_MP2;
939 } else if (code == 0x1bd) {
940 codec_type = CODEC_TYPE_AUDIO;
941 codec_id = CODEC_ID_AC3;
943 codec_type = CODEC_TYPE_VIDEO;
944 codec_id = CODEC_ID_MPEG1VIDEO;
948 st = av_new_stream(pes->stream, pes->pid);
950 av_set_pts_info(st, 33, 1, 90000);
952 st->codec->codec_type = codec_type;
953 st->codec->codec_id = codec_id;
954 st->need_parsing = AVSTREAM_PARSE_FULL;
961 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int stream_type)
966 /* if no pid found, then add a pid context */
967 pes = av_mallocz(sizeof(PESContext));
971 pes->stream = ts->stream;
973 pes->stream_type = stream_type;
974 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
982 /* handle one TS packet */
983 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
985 AVFormatContext *s = ts->stream;
987 int len, pid, cc, cc_ok, afc, is_start;
988 const uint8_t *p, *p_end;
990 pid = ((packet[1] & 0x1f) << 8) | packet[2];
991 is_start = packet[1] & 0x40;
993 if (ts->auto_guess && tss == NULL && is_start) {
994 add_pes_stream(ts, pid, 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->u.pes_filter.opaque,
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)
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;
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))
1173 v = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
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;
1187 MpegTSService *service;
1190 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1191 if(ap->mpeg2ts_raw){
1192 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1197 /* read the first 1024 bytes to get packet size */
1198 pos = url_ftell(pb);
1199 len = get_buffer(pb, buf, sizeof(buf));
1200 if (len != sizeof(buf))
1202 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1203 if (ts->raw_packet_size <= 0)
1208 if (s->iformat == &mpegts_demuxer) {
1211 /* first do a scaning to get all the services */
1212 url_fseek(pb, pos, SEEK_SET);
1213 mpegts_scan_sdt(ts);
1215 if (ts->nb_services <= 0) {
1216 mpegts_scan_pat(ts);
1218 handle_packets(ts, s->probesize);
1221 if (ts->nb_services <= 0) {
1222 /* raw transport stream */
1224 s->ctx_flags |= AVFMTCTX_NOHEADER;
1228 /* tune to first service found */
1229 for(i=0; i<ts->nb_services; i++){
1230 service = ts->services[i];
1233 av_log(ts->stream, AV_LOG_DEBUG, "tuning to '%s'\n", service->name);
1236 /* now find the info for the first service if we found any,
1237 otherwise try to filter all PATs */
1239 url_fseek(pb, pos, SEEK_SET);
1240 mpegts_set_service(ts, sid);
1242 handle_packets(ts, s->probesize);
1244 /* if could not find service, enable auto_guess */
1249 av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
1251 s->ctx_flags |= AVFMTCTX_NOHEADER;
1254 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1255 int64_t pcrs[2], pcr_h;
1256 int packet_count[2];
1257 uint8_t packet[TS_PACKET_SIZE];
1259 /* only read packets */
1262 st = av_new_stream(s, 0);
1265 av_set_pts_info(st, 60, 1, 27000000);
1266 st->codec->codec_type = CODEC_TYPE_DATA;
1267 st->codec->codec_id = CODEC_ID_MPEG2TS;
1269 /* we iterate until we find two PCRs to estimate the bitrate */
1274 ret = read_packet(&s->pb, packet, ts->raw_packet_size);
1277 pid = ((packet[1] & 0x1f) << 8) | packet[2];
1278 if ((pcr_pid == -1 || pcr_pid == pid) &&
1279 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1281 packet_count[nb_pcrs] = nb_packets;
1282 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1289 ts->pcr_pid = pcr_pid;
1291 /* NOTE1: the bitrate is computed without the FEC */
1292 /* NOTE2: it is only the bitrate of the start of the stream */
1293 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1294 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1295 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1296 st->codec->bit_rate = s->bit_rate;
1297 st->start_time = ts->cur_pcr;
1299 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1300 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1304 url_fseek(pb, pos, SEEK_SET);
1310 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1312 static int mpegts_raw_read_packet(AVFormatContext *s,
1315 MpegTSContext *ts = s->priv_data;
1317 int64_t pcr_h, next_pcr_h, pos;
1318 int pcr_l, next_pcr_l;
1319 uint8_t pcr_buf[12];
1321 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1322 return AVERROR(ENOMEM);
1323 pkt->pos= url_ftell(&s->pb);
1324 ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size);
1326 av_free_packet(pkt);
1329 if (ts->mpeg2ts_compute_pcr) {
1330 /* compute exact PCR for each packet */
1331 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1332 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1333 pos = url_ftell(&s->pb);
1334 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1335 url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1336 get_buffer(&s->pb, pcr_buf, 12);
1337 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1338 /* XXX: not precise enough */
1339 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1344 url_fseek(&s->pb, pos, SEEK_SET);
1345 /* no next PCR found: we use previous increment */
1346 ts->cur_pcr = pcr_h * 300 + pcr_l;
1348 pkt->pts = ts->cur_pcr;
1349 pkt->duration = ts->pcr_incr;
1350 ts->cur_pcr += ts->pcr_incr;
1352 pkt->stream_index = 0;
1356 static int mpegts_read_packet(AVFormatContext *s,
1359 MpegTSContext *ts = s->priv_data;
1362 return handle_packets(ts, 0);
1365 static int mpegts_read_close(AVFormatContext *s)
1367 MpegTSContext *ts = s->priv_data;
1369 for(i=0;i<NB_PID_MAX;i++)
1370 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1372 for(i = 0; i < ts->nb_services; i++){
1373 av_free(ts->services[i]->provider_name);
1374 av_free(ts->services[i]->name);
1375 av_free(ts->services[i]);
1377 av_freep(&ts->services);
1382 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1383 int64_t *ppos, int64_t pos_limit)
1385 MpegTSContext *ts = s->priv_data;
1386 int64_t pos, timestamp;
1387 uint8_t buf[TS_PACKET_SIZE];
1389 const int find_next= 1;
1390 pos = ((*ppos + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size;
1393 url_fseek(&s->pb, pos, SEEK_SET);
1394 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1395 return AV_NOPTS_VALUE;
1396 pid = ((buf[1] & 0x1f) << 8) | buf[2];
1397 if (pid == ts->pcr_pid &&
1398 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1401 pos += ts->raw_packet_size;
1405 pos -= ts->raw_packet_size;
1407 return AV_NOPTS_VALUE;
1408 url_fseek(&s->pb, pos, SEEK_SET);
1409 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1410 return AV_NOPTS_VALUE;
1411 pid = ((buf[1] & 0x1f) << 8) | buf[2];
1412 if (pid == ts->pcr_pid &&
1413 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1423 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1424 MpegTSContext *ts = s->priv_data;
1425 uint8_t buf[TS_PACKET_SIZE];
1428 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1431 pos= url_ftell(&s->pb);
1434 url_fseek(&s->pb, pos, SEEK_SET);
1435 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1437 // pid = ((buf[1] & 0x1f) << 8) | buf[2];
1438 if(buf[1] & 0x40) break;
1439 pos += ts->raw_packet_size;
1441 url_fseek(&s->pb, pos, SEEK_SET);
1446 /**************************************************************/
1447 /* parsing functions - called from other demuxers such as RTP */
1449 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1453 ts = av_mallocz(sizeof(MpegTSContext));
1456 /* no stream case, currently used by RTP */
1457 ts->raw_packet_size = TS_PACKET_SIZE;
1463 /* return the consumed length if a packet was output, or -1 if no
1465 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1466 const uint8_t *buf, int len)
1476 if (len < TS_PACKET_SIZE)
1478 if (buf[0] != 0x47) {
1482 handle_packet(ts, buf);
1483 buf += TS_PACKET_SIZE;
1484 len -= TS_PACKET_SIZE;
1490 void mpegts_parse_close(MpegTSContext *ts)
1494 for(i=0;i<NB_PID_MAX;i++)
1495 av_free(ts->pids[i]);
1499 AVInputFormat mpegts_demuxer = {
1501 "MPEG2 transport stream format",
1502 sizeof(MpegTSContext),
1509 .flags = AVFMT_SHOW_IDS,
1512 AVInputFormat mpegtsraw_demuxer = {
1514 "MPEG2 raw transport stream format",
1515 sizeof(MpegTSContext),
1518 mpegts_raw_read_packet,
1522 .flags = AVFMT_SHOW_IDS,