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);
339 ts->pids[pid] = NULL;
342 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
343 int stat[packet_size];
348 memset(stat, 0, packet_size*sizeof(int));
350 for(x=i=0; i<size; i++){
353 if(stat[x] > best_score){
360 if(x == packet_size) x= 0;
366 /* autodetect fec presence. Must have at least 1024 bytes */
367 static int get_packet_size(const uint8_t *buf, int size)
369 int score, fec_score, dvhs_score;
371 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
374 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
375 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
376 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
377 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
379 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
380 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
381 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
385 typedef struct SectionHeader {
390 uint8_t last_sec_num;
393 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
406 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
412 if ((p + 1) >= p_end)
420 /* read and allocate a DVB string preceeded by its length */
421 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
428 len = get8(&p, p_end);
431 if ((p + len) > p_end)
433 str = av_malloc(len + 1);
443 static int parse_section_header(SectionHeader *h,
444 const uint8_t **pp, const uint8_t *p_end)
448 val = get8(pp, p_end);
453 val = get16(pp, p_end);
457 val = get8(pp, p_end);
460 h->version = (val >> 1) & 0x1f;
461 val = get8(pp, p_end);
465 val = get8(pp, p_end);
468 h->last_sec_num = val;
473 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
475 MpegTSContext *ts = filter->u.section_filter.opaque;
476 SectionHeader h1, *h = &h1;
479 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
480 int program_info_length, pcr_pid, pid, stream_type;
481 int desc_list_len, desc_len, desc_tag;
482 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
483 char language[4] = {0}; /* initialize to kill warnings */
484 int has_hdmv_descr = 0;
487 av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
488 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
490 p_end = section + section_len - 4;
492 if (parse_section_header(h, &p, p_end) < 0)
495 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
496 h->id, h->sec_num, h->last_sec_num);
498 if (h->tid != PMT_TID)
501 clear_program(ts, h->id);
502 pcr_pid = get16(&p, p_end) & 0x1fff;
505 add_pid_to_pmt(ts, h->id, pcr_pid);
507 av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
509 program_info_length = get16(&p, p_end) & 0xfff;
510 if (program_info_length < 0)
512 while(program_info_length >= 2) {
514 tag = get8(&p, p_end);
515 len = get8(&p, p_end);
516 if(len > program_info_length - 2)
517 //something else is broken, exit the program_descriptors_loop
519 program_info_length -= len + 2;
520 if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
522 bytes[0] = get8(&p, p_end);
523 bytes[1] = get8(&p, p_end);
524 bytes[2] = get8(&p, p_end);
525 bytes[3] = get8(&p, p_end);
527 if(bytes[0] == 'H' && bytes[1] == 'D' &&
528 bytes[2] == 'M' && bytes[3] == 'V')
533 p += program_info_length;
539 stream_type = get8(&p, p_end);
542 pid = get16(&p, p_end) & 0x1fff;
545 desc_list_len = get16(&p, p_end) & 0xfff;
546 if (desc_list_len < 0)
548 desc_list_end = p + desc_list_len;
549 if (desc_list_end > p_end)
552 desc_tag = get8(&p, desc_list_end);
555 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
556 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
557 /*assume DVB AC-3 Audio*/
558 stream_type = STREAM_TYPE_AUDIO_AC3;
559 } else if(desc_tag == 0x7B) {
561 stream_type = STREAM_TYPE_AUDIO_DTS;
564 desc_len = get8(&p, desc_list_end);
565 desc_end = p + desc_len;
566 if (desc_end > desc_list_end)
569 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
573 case DVB_SUBT_DESCID:
574 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
575 stream_type = STREAM_TYPE_SUBTITLE_DVB;
577 language[0] = get8(&p, desc_end);
578 language[1] = get8(&p, desc_end);
579 language[2] = get8(&p, desc_end);
582 comp_page = get16(&p, desc_end);
583 anc_page = get16(&p, desc_end);
586 case 0x0a: /* ISO 639 language descriptor */
587 language[0] = get8(&p, desc_end);
588 language[1] = get8(&p, desc_end);
589 language[2] = get8(&p, desc_end);
600 av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
604 /* now create ffmpeg stream */
605 switch(stream_type) {
606 case STREAM_TYPE_AUDIO_MPEG1:
607 case STREAM_TYPE_AUDIO_MPEG2:
608 case STREAM_TYPE_VIDEO_MPEG1:
609 case STREAM_TYPE_VIDEO_MPEG2:
610 case STREAM_TYPE_VIDEO_MPEG4:
611 case STREAM_TYPE_VIDEO_H264:
612 case STREAM_TYPE_VIDEO_VC1:
613 case STREAM_TYPE_AUDIO_AAC:
614 case STREAM_TYPE_AUDIO_AC3:
615 case STREAM_TYPE_AUDIO_DTS:
616 case STREAM_TYPE_AUDIO_HDMV_DTS:
617 case STREAM_TYPE_SUBTITLE_DVB:
618 if(stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
620 if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
621 pes= ts->pids[pid]->u.pes_filter.opaque;
624 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
625 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
627 st = new_pes_av_stream(pes, 0);
629 add_pid_to_pmt(ts, h->id, pid);
631 av_program_add_stream_index(ts->stream, h->id, st->index);
634 /* we ignore the other streams */
639 if (language[0] != 0) {
640 memcpy(st->language, language, 4);
643 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
644 st->codec->sub_id = (anc_page << 16) | comp_page;
648 /* all parameters are there */
650 mpegts_close_filter(ts, filter);
653 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
655 MpegTSContext *ts = filter->u.section_filter.opaque;
656 SectionHeader h1, *h = &h1;
657 const uint8_t *p, *p_end;
661 av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
662 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
664 p_end = section + section_len - 4;
666 if (parse_section_header(h, &p, p_end) < 0)
668 if (h->tid != PAT_TID)
673 sid = get16(&p, p_end);
676 pmt_pid = get16(&p, p_end) & 0x1fff;
680 av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
685 av_new_program(ts->stream, sid);
687 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
688 add_pat_entry(ts, sid);
689 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
690 add_pid_to_pmt(ts, sid, pmt_pid);
696 mpegts_close_filter(ts, filter);
699 static void mpegts_set_service(MpegTSContext *ts)
701 mpegts_open_section_filter(ts, PAT_PID,
705 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
707 MpegTSContext *ts = filter->u.section_filter.opaque;
708 SectionHeader h1, *h = &h1;
709 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
710 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
711 char *name, *provider_name;
714 av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
715 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
718 p_end = section + section_len - 4;
720 if (parse_section_header(h, &p, p_end) < 0)
722 if (h->tid != SDT_TID)
724 onid = get16(&p, p_end);
727 val = get8(&p, p_end);
731 sid = get16(&p, p_end);
734 val = get8(&p, p_end);
737 desc_list_len = get16(&p, p_end) & 0xfff;
738 if (desc_list_len < 0)
740 desc_list_end = p + desc_list_len;
741 if (desc_list_end > p_end)
744 desc_tag = get8(&p, desc_list_end);
747 desc_len = get8(&p, desc_list_end);
748 desc_end = p + desc_len;
749 if (desc_end > desc_list_end)
752 av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
757 service_type = get8(&p, p_end);
758 if (service_type < 0)
760 provider_name = getstr8(&p, p_end);
763 name = getstr8(&p, p_end);
765 AVProgram *program = av_new_program(ts->stream, sid);
767 av_set_program_name(program, provider_name, name);
770 av_free(provider_name);
781 /* scan services in a transport stream by looking at the SDT */
782 static void mpegts_scan_sdt(MpegTSContext *ts)
784 mpegts_open_section_filter(ts, SDT_PID,
788 static int64_t get_pts(const uint8_t *p)
790 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
791 pts |= (AV_RB16(p + 1) >> 1) << 15;
792 pts |= AV_RB16(p + 3) >> 1;
796 /* return non zero if a packet could be constructed */
797 static void mpegts_push_data(MpegTSFilter *filter,
798 const uint8_t *buf, int buf_size, int is_start)
800 PESContext *pes = filter->u.pes_filter.opaque;
801 MpegTSContext *ts = pes->ts;
809 pes->state = MPEGTS_HEADER;
813 while (buf_size > 0) {
816 len = PES_START_SIZE - pes->data_index;
819 memcpy(pes->header + pes->data_index, p, len);
820 pes->data_index += len;
823 if (pes->data_index == PES_START_SIZE) {
824 /* we got all the PES or section header. We can now
827 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
829 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
830 pes->header[2] == 0x01) {
831 /* it must be an mpeg2 PES stream */
832 code = pes->header[3] | 0x100;
833 if (!((code >= 0x1c0 && code <= 0x1df) ||
834 (code >= 0x1e0 && code <= 0x1ef) ||
835 (code == 0x1bd) || (code == 0x1fd)))
838 /* allocate stream */
839 new_pes_av_stream(pes, code);
841 pes->state = MPEGTS_PESHEADER_FILL;
842 pes->total_size = AV_RB16(pes->header + 4);
843 /* NOTE: a zero total size means the PES size is
846 pes->total_size += 6;
847 pes->pes_header_size = pes->header[8] + 9;
849 /* otherwise, it should be a table */
852 pes->state = MPEGTS_SKIP;
857 /**********************************************/
858 /* PES packing parsing */
859 case MPEGTS_PESHEADER_FILL:
860 len = pes->pes_header_size - pes->data_index;
863 memcpy(pes->header + pes->data_index, p, len);
864 pes->data_index += len;
867 if (pes->data_index == pes->pes_header_size) {
871 flags = pes->header[7];
873 pes->pts = AV_NOPTS_VALUE;
874 pes->dts = AV_NOPTS_VALUE;
875 if ((flags & 0xc0) == 0x80) {
876 pes->pts = get_pts(r);
878 } else if ((flags & 0xc0) == 0xc0) {
879 pes->pts = get_pts(r);
881 pes->dts = get_pts(r);
884 /* we got the full header. We parse it and get the payload */
885 pes->state = MPEGTS_PAYLOAD;
889 if (pes->total_size) {
890 len = pes->total_size - pes->data_index;
897 AVPacket *pkt = ts->pkt;
898 if (pes->st && av_new_packet(pkt, len) == 0) {
899 memcpy(pkt->data, p, len);
900 pkt->stream_index = pes->st->index;
903 /* reset pts values */
904 pes->pts = AV_NOPTS_VALUE;
905 pes->dts = AV_NOPTS_VALUE;
919 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
922 int codec_type, codec_id;
924 switch(pes->stream_type){
925 case STREAM_TYPE_AUDIO_MPEG1:
926 case STREAM_TYPE_AUDIO_MPEG2:
927 codec_type = CODEC_TYPE_AUDIO;
928 codec_id = CODEC_ID_MP3;
930 case STREAM_TYPE_VIDEO_MPEG1:
931 case STREAM_TYPE_VIDEO_MPEG2:
932 codec_type = CODEC_TYPE_VIDEO;
933 codec_id = CODEC_ID_MPEG2VIDEO;
935 case STREAM_TYPE_VIDEO_MPEG4:
936 codec_type = CODEC_TYPE_VIDEO;
937 codec_id = CODEC_ID_MPEG4;
939 case STREAM_TYPE_VIDEO_H264:
940 codec_type = CODEC_TYPE_VIDEO;
941 codec_id = CODEC_ID_H264;
943 case STREAM_TYPE_VIDEO_VC1:
944 codec_type = CODEC_TYPE_VIDEO;
945 codec_id = CODEC_ID_VC1;
947 case STREAM_TYPE_AUDIO_AAC:
948 codec_type = CODEC_TYPE_AUDIO;
949 codec_id = CODEC_ID_AAC;
951 case STREAM_TYPE_AUDIO_AC3:
952 codec_type = CODEC_TYPE_AUDIO;
953 codec_id = CODEC_ID_AC3;
955 case STREAM_TYPE_AUDIO_DTS:
956 case STREAM_TYPE_AUDIO_HDMV_DTS:
957 codec_type = CODEC_TYPE_AUDIO;
958 codec_id = CODEC_ID_DTS;
960 case STREAM_TYPE_SUBTITLE_DVB:
961 codec_type = CODEC_TYPE_SUBTITLE;
962 codec_id = CODEC_ID_DVB_SUBTITLE;
965 if (code >= 0x1c0 && code <= 0x1df) {
966 codec_type = CODEC_TYPE_AUDIO;
967 codec_id = CODEC_ID_MP2;
968 } else if (code == 0x1bd) {
969 codec_type = CODEC_TYPE_AUDIO;
970 codec_id = CODEC_ID_AC3;
972 codec_type = CODEC_TYPE_VIDEO;
973 codec_id = CODEC_ID_MPEG1VIDEO;
977 st = av_new_stream(pes->stream, pes->pid);
979 av_set_pts_info(st, 33, 1, 90000);
981 st->codec->codec_type = codec_type;
982 st->codec->codec_id = codec_id;
983 st->need_parsing = AVSTREAM_PARSE_FULL;
990 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
995 /* if no pid found, then add a pid context */
996 pes = av_mallocz(sizeof(PESContext));
1000 pes->stream = ts->stream;
1002 pes->pcr_pid = pcr_pid;
1003 pes->stream_type = stream_type;
1004 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1012 /* handle one TS packet */
1013 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
1015 AVFormatContext *s = ts->stream;
1017 int len, pid, cc, cc_ok, afc, is_start;
1018 const uint8_t *p, *p_end;
1020 pid = AV_RB16(packet + 1) & 0x1fff;
1021 if(pid && discard_pid(ts, pid))
1023 is_start = packet[1] & 0x40;
1024 tss = ts->pids[pid];
1025 if (ts->auto_guess && tss == NULL && is_start) {
1026 add_pes_stream(ts, pid, -1, 0);
1027 tss = ts->pids[pid];
1032 /* continuity check (currently not used) */
1033 cc = (packet[3] & 0xf);
1034 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1037 /* skip adaptation field */
1038 afc = (packet[3] >> 4) & 3;
1040 if (afc == 0) /* reserved value */
1042 if (afc == 2) /* adaptation field only */
1045 /* skip adapation field */
1048 /* if past the end of packet, ignore */
1049 p_end = packet + TS_PACKET_SIZE;
1053 ts->pos47= url_ftell(ts->stream->pb) % ts->raw_packet_size;
1055 if (tss->type == MPEGTS_SECTION) {
1057 /* pointer field present */
1059 if (p + len > p_end)
1062 /* write remaining section bytes */
1063 write_section_data(s, tss,
1065 /* check whether filter has been closed */
1071 write_section_data(s, tss,
1076 write_section_data(s, tss,
1081 tss->u.pes_filter.pes_cb(tss,
1082 p, p_end - p, is_start);
1086 /* XXX: try to find a better synchro over several packets (use
1087 get_packet_size() ?) */
1088 static int mpegts_resync(ByteIOContext *pb)
1092 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1097 url_fseek(pb, -1, SEEK_CUR);
1105 /* return -1 if error or EOF. Return 0 if OK. */
1106 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1111 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1112 if (len != TS_PACKET_SIZE)
1113 return AVERROR(EIO);
1114 /* check paquet sync byte */
1115 if (buf[0] != 0x47) {
1116 /* find a new packet start */
1117 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1118 if (mpegts_resync(pb) < 0)
1119 return AVERROR_INVALIDDATA;
1123 skip = raw_packet_size - TS_PACKET_SIZE;
1125 url_fskip(pb, skip);
1132 static int handle_packets(MpegTSContext *ts, int nb_packets)
1134 AVFormatContext *s = ts->stream;
1135 ByteIOContext *pb = s->pb;
1136 uint8_t packet[TS_PACKET_SIZE];
1137 int packet_num, ret;
1142 if (ts->stop_parse>0)
1145 if (nb_packets != 0 && packet_num >= nb_packets)
1147 ret = read_packet(pb, packet, ts->raw_packet_size);
1150 handle_packet(ts, packet);
1155 static int mpegts_probe(AVProbeData *p)
1158 const int size= p->buf_size;
1159 int score, fec_score, dvhs_score;
1160 #define CHECK_COUNT 10
1162 if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))
1165 score = analyze(p->buf, TS_PACKET_SIZE *CHECK_COUNT, TS_PACKET_SIZE, NULL);
1166 dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);
1167 fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);
1168 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1170 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1171 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1172 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1173 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1176 /* only use the extension for safer guess */
1177 if (match_ext(p->filename, "ts"))
1178 return AVPROBE_SCORE_MAX;
1184 /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return
1185 (-1) if not available */
1186 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1187 const uint8_t *packet)
1189 int afc, len, flags;
1193 afc = (packet[3] >> 4) & 3;
1203 if (!(flags & 0x10))
1208 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1209 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1213 static int mpegts_read_header(AVFormatContext *s,
1214 AVFormatParameters *ap)
1216 MpegTSContext *ts = s->priv_data;
1217 ByteIOContext *pb = s->pb;
1223 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1224 if(ap->mpeg2ts_raw){
1225 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1230 /* read the first 1024 bytes to get packet size */
1231 pos = url_ftell(pb);
1232 len = get_buffer(pb, buf, sizeof(buf));
1233 if (len != sizeof(buf))
1235 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1236 if (ts->raw_packet_size <= 0)
1241 if (s->iformat == &mpegts_demuxer) {
1244 /* first do a scaning to get all the services */
1245 url_fseek(pb, pos, SEEK_SET);
1246 mpegts_scan_sdt(ts);
1248 mpegts_set_service(ts);
1250 handle_packets(ts, s->probesize);
1251 /* if could not find service, enable auto_guess */
1256 av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
1258 s->ctx_flags |= AVFMTCTX_NOHEADER;
1261 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1262 int64_t pcrs[2], pcr_h;
1263 int packet_count[2];
1264 uint8_t packet[TS_PACKET_SIZE];
1266 /* only read packets */
1268 st = av_new_stream(s, 0);
1271 av_set_pts_info(st, 60, 1, 27000000);
1272 st->codec->codec_type = CODEC_TYPE_DATA;
1273 st->codec->codec_id = CODEC_ID_MPEG2TS;
1275 /* we iterate until we find two PCRs to estimate the bitrate */
1280 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1283 pid = AV_RB16(packet + 1) & 0x1fff;
1284 if ((pcr_pid == -1 || pcr_pid == pid) &&
1285 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1287 packet_count[nb_pcrs] = nb_packets;
1288 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1296 /* NOTE1: the bitrate is computed without the FEC */
1297 /* NOTE2: it is only the bitrate of the start of the stream */
1298 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1299 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1300 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1301 st->codec->bit_rate = s->bit_rate;
1302 st->start_time = ts->cur_pcr;
1304 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1305 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1309 url_fseek(pb, pos, SEEK_SET);
1315 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1317 static int mpegts_raw_read_packet(AVFormatContext *s,
1320 MpegTSContext *ts = s->priv_data;
1322 int64_t pcr_h, next_pcr_h, pos;
1323 int pcr_l, next_pcr_l;
1324 uint8_t pcr_buf[12];
1326 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1327 return AVERROR(ENOMEM);
1328 pkt->pos= url_ftell(s->pb);
1329 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1331 av_free_packet(pkt);
1334 if (ts->mpeg2ts_compute_pcr) {
1335 /* compute exact PCR for each packet */
1336 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1337 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1338 pos = url_ftell(s->pb);
1339 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1340 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1341 get_buffer(s->pb, pcr_buf, 12);
1342 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1343 /* XXX: not precise enough */
1344 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1349 url_fseek(s->pb, pos, SEEK_SET);
1350 /* no next PCR found: we use previous increment */
1351 ts->cur_pcr = pcr_h * 300 + pcr_l;
1353 pkt->pts = ts->cur_pcr;
1354 pkt->duration = ts->pcr_incr;
1355 ts->cur_pcr += ts->pcr_incr;
1357 pkt->stream_index = 0;
1361 static int mpegts_read_packet(AVFormatContext *s,
1364 MpegTSContext *ts = s->priv_data;
1367 return handle_packets(ts, 0);
1370 static int mpegts_read_close(AVFormatContext *s)
1372 MpegTSContext *ts = s->priv_data;
1377 for(i=0;i<NB_PID_MAX;i++)
1378 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1383 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1384 int64_t *ppos, int64_t pos_limit)
1386 MpegTSContext *ts = s->priv_data;
1387 int64_t pos, timestamp;
1388 uint8_t buf[TS_PACKET_SIZE];
1389 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1390 const int find_next= 1;
1391 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1394 url_fseek(s->pb, pos, SEEK_SET);
1395 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1396 return AV_NOPTS_VALUE;
1397 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == 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 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1412 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1422 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1423 MpegTSContext *ts = s->priv_data;
1424 uint8_t buf[TS_PACKET_SIZE];
1427 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1430 pos= url_ftell(s->pb);
1433 url_fseek(s->pb, pos, SEEK_SET);
1434 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1436 // pid = AV_RB16(buf + 1) & 0x1fff;
1437 if(buf[1] & 0x40) break;
1438 pos += ts->raw_packet_size;
1440 url_fseek(s->pb, pos, SEEK_SET);
1445 /**************************************************************/
1446 /* parsing functions - called from other demuxers such as RTP */
1448 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1452 ts = av_mallocz(sizeof(MpegTSContext));
1455 /* no stream case, currently used by RTP */
1456 ts->raw_packet_size = TS_PACKET_SIZE;
1462 /* return the consumed length if a packet was output, or -1 if no
1464 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1465 const uint8_t *buf, int len)
1473 if (ts->stop_parse>0)
1475 if (len < TS_PACKET_SIZE)
1477 if (buf[0] != 0x47) {
1481 handle_packet(ts, buf);
1482 buf += TS_PACKET_SIZE;
1483 len -= TS_PACKET_SIZE;
1489 void mpegts_parse_close(MpegTSContext *ts)
1493 for(i=0;i<NB_PID_MAX;i++)
1494 av_free(ts->pids[i]);
1498 AVInputFormat mpegts_demuxer = {
1500 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1501 sizeof(MpegTSContext),
1508 .flags = AVFMT_SHOW_IDS,
1511 AVInputFormat mpegtsraw_demuxer = {
1513 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1514 sizeof(MpegTSContext),
1517 mpegts_raw_read_packet,
1521 .flags = AVFMT_SHOW_IDS,