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 //#define USE_SYNCPOINT_SEARCH
26 #include "libavutil/crc.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavcodec/bytestream.h"
34 /* 1.0 second at 24Mbit/s */
35 #define MAX_SCAN_PACKETS 32000
37 /* maximum size in which we look for synchronisation if
38 synchronisation is lost */
39 #define MAX_RESYNC_SIZE 65536
41 #define MAX_PES_PAYLOAD 200*1024
43 enum MpegTSFilterType {
48 typedef struct MpegTSFilter MpegTSFilter;
50 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
52 typedef struct MpegTSPESFilter {
57 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
59 typedef void SetServiceCallback(void *opaque, int ret);
61 typedef struct MpegTSSectionFilter {
65 unsigned int check_crc:1;
66 unsigned int end_of_section_reached:1;
67 SectionCallback *section_cb;
69 } MpegTSSectionFilter;
73 int last_cc; /* last cc code (-1 if first packet) */
74 enum MpegTSFilterType type;
76 MpegTSPESFilter pes_filter;
77 MpegTSSectionFilter section_filter;
81 #define MAX_PIDS_PER_PROGRAM 64
83 unsigned int id; //program id/service id
85 unsigned int pids[MAX_PIDS_PER_PROGRAM];
88 struct MpegTSContext {
90 AVFormatContext *stream;
91 /** raw packet size, including FEC if present */
96 /** if true, all pids are analyzed to find streams */
99 /** compute exact PCR for each transport stream packet */
100 int mpeg2ts_compute_pcr;
102 int64_t cur_pcr; /**< used to estimate the exact PCR */
103 int pcr_incr; /**< used to estimate the exact PCR */
105 /* data needed to handle file based ts */
106 /** stop parsing loop */
108 /** packet containing Audio/Video data */
110 /** to detect seek */
113 /******************************************/
114 /* private mpegts data */
116 /** structure to keep track of Program->pids mapping */
121 /** filters for various streams specified by PMT + for the PAT and PMT */
122 MpegTSFilter *pids[NB_PID_MAX];
125 /* TS stream handling */
130 MPEGTS_PESHEADER_FILL,
135 /* enough for PES header + length */
136 #define PES_START_SIZE 6
137 #define PES_HEADER_SIZE 9
138 #define MAX_PES_HEADER_SIZE (9 + 255)
140 typedef struct PESContext {
142 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
145 AVFormatContext *stream;
147 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
148 enum MpegTSState state;
149 /* used to get the format */
153 int extended_stream_id;
155 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
156 uint8_t header[MAX_PES_HEADER_SIZE];
160 extern AVInputFormat mpegts_demuxer;
162 static void clear_program(MpegTSContext *ts, unsigned int programid)
166 for(i=0; i<ts->nb_prg; i++)
167 if(ts->prg[i].id == programid)
168 ts->prg[i].nb_pids = 0;
171 static void clear_programs(MpegTSContext *ts)
177 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
180 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
184 p = &ts->prg[ts->nb_prg];
190 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
193 struct Program *p = NULL;
194 for(i=0; i<ts->nb_prg; i++) {
195 if(ts->prg[i].id == programid) {
203 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
205 p->pids[p->nb_pids++] = pid;
209 * \brief discard_pid() decides if the pid is to be discarded according
210 * to caller's programs selection
211 * \param ts : - TS context
213 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
216 static int discard_pid(MpegTSContext *ts, unsigned int pid)
219 int used = 0, discarded = 0;
221 for(i=0; i<ts->nb_prg; i++) {
223 for(j=0; j<p->nb_pids; j++) {
224 if(p->pids[j] != pid)
226 //is program with id p->id set to be discarded?
227 for(k=0; k<ts->stream->nb_programs; k++) {
228 if(ts->stream->programs[k]->id == p->id) {
229 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
238 return !used && discarded;
242 * Assembles PES packets out of TS packets, and then calls the "section_cb"
243 * function when they are complete.
245 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
246 const uint8_t *buf, int buf_size, int is_start)
248 MpegTSSectionFilter *tss = &tss1->u.section_filter;
252 memcpy(tss->section_buf, buf, buf_size);
253 tss->section_index = buf_size;
254 tss->section_h_size = -1;
255 tss->end_of_section_reached = 0;
257 if (tss->end_of_section_reached)
259 len = 4096 - tss->section_index;
262 memcpy(tss->section_buf + tss->section_index, buf, len);
263 tss->section_index += len;
266 /* compute section length if possible */
267 if (tss->section_h_size == -1 && tss->section_index >= 3) {
268 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
271 tss->section_h_size = len;
274 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
275 tss->end_of_section_reached = 1;
276 if (!tss->check_crc ||
277 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
278 tss->section_buf, tss->section_h_size) == 0)
279 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
283 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
284 SectionCallback *section_cb, void *opaque,
288 MpegTSFilter *filter;
289 MpegTSSectionFilter *sec;
291 dprintf(ts->stream, "Filter: pid=0x%x\n", pid);
293 if (pid >= NB_PID_MAX || ts->pids[pid])
295 filter = av_mallocz(sizeof(MpegTSFilter));
298 ts->pids[pid] = filter;
299 filter->type = MPEGTS_SECTION;
301 filter->last_cc = -1;
302 sec = &filter->u.section_filter;
303 sec->section_cb = section_cb;
304 sec->opaque = opaque;
305 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
306 sec->check_crc = check_crc;
307 if (!sec->section_buf) {
314 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
318 MpegTSFilter *filter;
319 MpegTSPESFilter *pes;
321 if (pid >= NB_PID_MAX || ts->pids[pid])
323 filter = av_mallocz(sizeof(MpegTSFilter));
326 ts->pids[pid] = filter;
327 filter->type = MPEGTS_PES;
329 filter->last_cc = -1;
330 pes = &filter->u.pes_filter;
331 pes->pes_cb = pes_cb;
332 pes->opaque = opaque;
336 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
341 if (filter->type == MPEGTS_SECTION)
342 av_freep(&filter->u.section_filter.section_buf);
343 else if (filter->type == MPEGTS_PES) {
344 PESContext *pes = filter->u.pes_filter.opaque;
345 av_freep(&pes->buffer);
346 /* referenced private data will be freed later in
347 * av_close_input_stream */
348 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
349 av_freep(&filter->u.pes_filter.opaque);
354 ts->pids[pid] = NULL;
357 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
358 int stat[TS_MAX_PACKET_SIZE];
363 memset(stat, 0, packet_size*sizeof(int));
365 for(x=i=0; i<size-3; i++){
366 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
368 if(stat[x] > best_score){
375 if(x == packet_size) x= 0;
381 /* autodetect fec presence. Must have at least 1024 bytes */
382 static int get_packet_size(const uint8_t *buf, int size)
384 int score, fec_score, dvhs_score;
386 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
389 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
390 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
391 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
392 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
394 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
395 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
396 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
400 typedef struct SectionHeader {
405 uint8_t last_sec_num;
408 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
421 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
427 if ((p + 1) >= p_end)
435 /* read and allocate a DVB string preceeded by its length */
436 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
443 len = get8(&p, p_end);
446 if ((p + len) > p_end)
448 str = av_malloc(len + 1);
458 static int parse_section_header(SectionHeader *h,
459 const uint8_t **pp, const uint8_t *p_end)
463 val = get8(pp, p_end);
468 val = get16(pp, p_end);
472 val = get8(pp, p_end);
475 h->version = (val >> 1) & 0x1f;
476 val = get8(pp, p_end);
480 val = get8(pp, p_end);
483 h->last_sec_num = val;
488 uint32_t stream_type;
489 enum CodecType codec_type;
490 enum CodecID codec_id;
493 static const StreamType ISO_types[] = {
494 { 0x01, CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
495 { 0x02, CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
496 { 0x03, CODEC_TYPE_AUDIO, CODEC_ID_MP3 },
497 { 0x04, CODEC_TYPE_AUDIO, CODEC_ID_MP3 },
498 { 0x0f, CODEC_TYPE_AUDIO, CODEC_ID_AAC },
499 { 0x10, CODEC_TYPE_VIDEO, CODEC_ID_MPEG4 },
500 { 0x11, CODEC_TYPE_AUDIO, CODEC_ID_AAC }, /* LATM syntax */
501 { 0x1b, CODEC_TYPE_VIDEO, CODEC_ID_H264 },
502 { 0xd1, CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
503 { 0xea, CODEC_TYPE_VIDEO, CODEC_ID_VC1 },
507 static const StreamType HDMV_types[] = {
508 { 0x80, CODEC_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
509 { 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
510 { 0x82, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
511 { 0x83, CODEC_TYPE_AUDIO, CODEC_ID_TRUEHD },
512 { 0x84, CODEC_TYPE_AUDIO, CODEC_ID_EAC3 },
513 { 0x90, CODEC_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
518 static const StreamType MISC_types[] = {
519 { 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
520 { 0x8a, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
524 static const StreamType REGD_types[] = {
525 { MKTAG('d','r','a','c'), CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
526 { MKTAG('A','C','-','3'), CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
530 /* descriptor present */
531 static const StreamType DESC_types[] = {
532 { 0x6a, CODEC_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
533 { 0x7a, CODEC_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
534 { 0x7b, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
535 { 0x56, CODEC_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
536 { 0x59, CODEC_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
540 static void mpegts_find_stream_type(AVStream *st,
541 uint32_t stream_type, const StreamType *types)
543 for (; types->stream_type; types++) {
544 if (stream_type == types->stream_type) {
545 st->codec->codec_type = types->codec_type;
546 st->codec->codec_id = types->codec_id;
552 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
553 uint32_t stream_type, uint32_t prog_reg_desc)
555 av_set_pts_info(st, 33, 1, 90000);
557 st->codec->codec_type = CODEC_TYPE_DATA;
558 st->codec->codec_id = CODEC_ID_NONE;
559 st->need_parsing = AVSTREAM_PARSE_FULL;
561 pes->stream_type = stream_type;
563 av_log(pes->stream, AV_LOG_DEBUG,
564 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
565 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
567 st->codec->codec_tag = pes->stream_type;
569 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
570 if (prog_reg_desc == AV_RL32("HDMV") &&
571 st->codec->codec_id == CODEC_ID_NONE) {
572 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
573 if (pes->stream_type == 0x83) {
574 // HDMV TrueHD streams also contain an AC3 coded version of the
575 // audio track - add a second stream for this
577 // priv_data cannot be shared between streams
578 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
580 return AVERROR(ENOMEM);
581 memcpy(sub_pes, pes, sizeof(*sub_pes));
583 sub_st = av_new_stream(pes->stream, pes->pid);
586 return AVERROR(ENOMEM);
589 av_set_pts_info(sub_st, 33, 1, 90000);
590 sub_st->priv_data = sub_pes;
591 sub_st->codec->codec_type = CODEC_TYPE_AUDIO;
592 sub_st->codec->codec_id = CODEC_ID_AC3;
593 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
594 sub_pes->sub_st = pes->sub_st = sub_st;
597 if (st->codec->codec_id == CODEC_ID_NONE)
598 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
603 static int64_t get_pts(const uint8_t *p)
605 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
606 pts |= (AV_RB16(p + 1) >> 1) << 15;
607 pts |= AV_RB16(p + 3) >> 1;
611 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
615 pkt->destruct = av_destruct_packet;
616 pkt->data = pes->buffer;
617 pkt->size = pes->data_index;
618 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
620 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
621 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
622 pkt->stream_index = pes->sub_st->index;
624 pkt->stream_index = pes->st->index;
627 /* store position of first TS packet of this PES packet */
628 pkt->pos = pes->ts_packet_pos;
630 /* reset pts values */
631 pes->pts = AV_NOPTS_VALUE;
632 pes->dts = AV_NOPTS_VALUE;
637 /* return non zero if a packet could be constructed */
638 static int mpegts_push_data(MpegTSFilter *filter,
639 const uint8_t *buf, int buf_size, int is_start,
642 PESContext *pes = filter->u.pes_filter.opaque;
643 MpegTSContext *ts = pes->ts;
651 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
652 new_pes_packet(pes, ts->pkt);
655 pes->state = MPEGTS_HEADER;
657 pes->ts_packet_pos = pos;
660 while (buf_size > 0) {
663 len = PES_START_SIZE - pes->data_index;
666 memcpy(pes->header + pes->data_index, p, len);
667 pes->data_index += len;
670 if (pes->data_index == PES_START_SIZE) {
671 /* we got all the PES or section header. We can now
674 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
676 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
677 pes->header[2] == 0x01) {
678 /* it must be an mpeg2 PES stream */
679 code = pes->header[3] | 0x100;
680 dprintf(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
682 if ((!pes->st && pes->stream->nb_streams == MAX_STREAMS) ||
683 (pes->st && pes->st->discard == AVDISCARD_ALL) ||
684 code == 0x1be) /* padding_stream */
687 /* stream not present in PMT */
689 pes->st = av_new_stream(ts->stream, pes->pid);
691 return AVERROR(ENOMEM);
692 mpegts_set_stream_info(pes->st, pes, 0, 0);
695 pes->total_size = AV_RB16(pes->header + 4);
696 /* NOTE: a zero total size means the PES size is
698 if (!pes->total_size)
699 pes->total_size = MAX_PES_PAYLOAD;
701 /* allocate pes buffer */
702 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
704 return AVERROR(ENOMEM);
706 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
707 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
708 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
709 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
710 pes->state = MPEGTS_PESHEADER;
711 if (pes->st->codec->codec_id == CODEC_ID_NONE) {
712 dprintf(pes->stream, "pid=%x stream_type=%x probing\n",
713 pes->pid, pes->stream_type);
714 pes->st->codec->codec_id = CODEC_ID_PROBE;
717 pes->state = MPEGTS_PAYLOAD;
721 /* otherwise, it should be a table */
724 pes->state = MPEGTS_SKIP;
729 /**********************************************/
730 /* PES packing parsing */
731 case MPEGTS_PESHEADER:
732 len = PES_HEADER_SIZE - pes->data_index;
737 memcpy(pes->header + pes->data_index, p, len);
738 pes->data_index += len;
741 if (pes->data_index == PES_HEADER_SIZE) {
742 pes->pes_header_size = pes->header[8] + 9;
743 pes->state = MPEGTS_PESHEADER_FILL;
746 case MPEGTS_PESHEADER_FILL:
747 len = pes->pes_header_size - pes->data_index;
752 memcpy(pes->header + pes->data_index, p, len);
753 pes->data_index += len;
756 if (pes->data_index == pes->pes_header_size) {
758 unsigned int flags, pes_ext, skip;
760 flags = pes->header[7];
762 pes->pts = AV_NOPTS_VALUE;
763 pes->dts = AV_NOPTS_VALUE;
764 if ((flags & 0xc0) == 0x80) {
765 pes->dts = pes->pts = get_pts(r);
767 } else if ((flags & 0xc0) == 0xc0) {
768 pes->pts = get_pts(r);
770 pes->dts = get_pts(r);
773 pes->extended_stream_id = -1;
774 if (flags & 0x01) { /* PES extension */
776 /* Skip PES private data, program packet sequence counter and P-STD buffer */
777 skip = (pes_ext >> 4) & 0xb;
780 if ((pes_ext & 0x41) == 0x01 &&
781 (r + 2) <= (pes->header + pes->pes_header_size)) {
782 /* PES extension 2 */
783 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
784 pes->extended_stream_id = r[1];
788 /* we got the full header. We parse it and get the payload */
789 pes->state = MPEGTS_PAYLOAD;
794 if (buf_size > 0 && pes->buffer) {
795 if (pes->data_index+buf_size > pes->total_size) {
796 new_pes_packet(pes, ts->pkt);
797 pes->total_size = MAX_PES_PAYLOAD;
798 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
800 return AVERROR(ENOMEM);
803 memcpy(pes->buffer+pes->data_index, p, buf_size);
804 pes->data_index += buf_size;
817 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
822 /* if no pid found, then add a pid context */
823 pes = av_mallocz(sizeof(PESContext));
827 pes->stream = ts->stream;
829 pes->pcr_pid = pcr_pid;
830 pes->state = MPEGTS_SKIP;
831 pes->pts = AV_NOPTS_VALUE;
832 pes->dts = AV_NOPTS_VALUE;
833 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
841 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
843 MpegTSContext *ts = filter->u.section_filter.opaque;
844 SectionHeader h1, *h = &h1;
847 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
848 int program_info_length, pcr_pid, pid, stream_type;
849 int desc_list_len, desc_len, desc_tag;
850 int comp_page, anc_page;
852 uint32_t prog_reg_desc = 0; /* registration descriptor */
855 dprintf(ts->stream, "PMT: len %i\n", section_len);
856 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
859 p_end = section + section_len - 4;
861 if (parse_section_header(h, &p, p_end) < 0)
864 dprintf(ts->stream, "sid=0x%x sec_num=%d/%d\n",
865 h->id, h->sec_num, h->last_sec_num);
867 if (h->tid != PMT_TID)
870 clear_program(ts, h->id);
871 pcr_pid = get16(&p, p_end) & 0x1fff;
874 add_pid_to_pmt(ts, h->id, pcr_pid);
876 dprintf(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
878 program_info_length = get16(&p, p_end) & 0xfff;
879 if (program_info_length < 0)
881 while(program_info_length >= 2) {
883 tag = get8(&p, p_end);
884 len = get8(&p, p_end);
885 if(len > program_info_length - 2)
886 //something else is broken, exit the program_descriptors_loop
888 program_info_length -= len + 2;
889 if(tag == 0x05 && len >= 4) { // registration descriptor
890 prog_reg_desc = bytestream_get_le32(&p);
895 p += program_info_length;
899 // stop parsing after pmt, we found header
900 if (!ts->stream->nb_streams)
905 stream_type = get8(&p, p_end);
908 pid = get16(&p, p_end) & 0x1fff;
912 /* now create ffmpeg stream */
913 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
914 pes = ts->pids[pid]->u.pes_filter.opaque;
917 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
918 pes = add_pes_stream(ts, pid, pcr_pid);
920 st = av_new_stream(pes->stream, pes->pid);
926 if (!pes->stream_type)
927 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
929 add_pid_to_pmt(ts, h->id, pid);
931 av_program_add_stream_index(ts->stream, h->id, st->index);
933 desc_list_len = get16(&p, p_end) & 0xfff;
934 if (desc_list_len < 0)
936 desc_list_end = p + desc_list_len;
937 if (desc_list_end > p_end)
940 desc_tag = get8(&p, desc_list_end);
943 desc_len = get8(&p, desc_list_end);
946 desc_end = p + desc_len;
947 if (desc_end > desc_list_end)
950 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
953 if (st->codec->codec_id == CODEC_ID_NONE &&
954 stream_type == STREAM_TYPE_PRIVATE_DATA)
955 mpegts_find_stream_type(st, desc_tag, DESC_types);
958 case 0x56: /* DVB teletext descriptor */
959 language[0] = get8(&p, desc_end);
960 language[1] = get8(&p, desc_end);
961 language[2] = get8(&p, desc_end);
963 av_metadata_set(&st->metadata, "language", language);
965 case 0x59: /* subtitling descriptor */
966 language[0] = get8(&p, desc_end);
967 language[1] = get8(&p, desc_end);
968 language[2] = get8(&p, desc_end);
971 comp_page = get16(&p, desc_end);
972 anc_page = get16(&p, desc_end);
973 st->codec->sub_id = (anc_page << 16) | comp_page;
974 av_metadata_set(&st->metadata, "language", language);
976 case 0x0a: /* ISO 639 language descriptor */
977 language[0] = get8(&p, desc_end);
978 language[1] = get8(&p, desc_end);
979 language[2] = get8(&p, desc_end);
981 av_metadata_set(&st->metadata, "language", language);
983 case 0x05: /* registration descriptor */
984 st->codec->codec_tag = bytestream_get_le32(&p);
985 dprintf(ts->stream, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
986 if (st->codec->codec_id == CODEC_ID_NONE &&
987 stream_type == STREAM_TYPE_PRIVATE_DATA)
988 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
995 if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
996 av_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
997 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1002 /* all parameters are there */
1003 mpegts_close_filter(ts, filter);
1006 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1008 MpegTSContext *ts = filter->u.section_filter.opaque;
1009 SectionHeader h1, *h = &h1;
1010 const uint8_t *p, *p_end;
1014 dprintf(ts->stream, "PAT:\n");
1015 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1017 p_end = section + section_len - 4;
1019 if (parse_section_header(h, &p, p_end) < 0)
1021 if (h->tid != PAT_TID)
1026 sid = get16(&p, p_end);
1029 pmt_pid = get16(&p, p_end) & 0x1fff;
1033 dprintf(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1035 if (sid == 0x0000) {
1038 av_new_program(ts->stream, sid);
1039 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1040 add_pat_entry(ts, sid);
1041 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1042 add_pid_to_pmt(ts, sid, pmt_pid);
1047 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1049 MpegTSContext *ts = filter->u.section_filter.opaque;
1050 SectionHeader h1, *h = &h1;
1051 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1052 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1053 char *name, *provider_name;
1056 dprintf(ts->stream, "SDT:\n");
1057 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
1060 p_end = section + section_len - 4;
1062 if (parse_section_header(h, &p, p_end) < 0)
1064 if (h->tid != SDT_TID)
1066 onid = get16(&p, p_end);
1069 val = get8(&p, p_end);
1073 sid = get16(&p, p_end);
1076 val = get8(&p, p_end);
1079 desc_list_len = get16(&p, p_end) & 0xfff;
1080 if (desc_list_len < 0)
1082 desc_list_end = p + desc_list_len;
1083 if (desc_list_end > p_end)
1086 desc_tag = get8(&p, desc_list_end);
1089 desc_len = get8(&p, desc_list_end);
1090 desc_end = p + desc_len;
1091 if (desc_end > desc_list_end)
1094 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
1095 desc_tag, desc_len);
1099 service_type = get8(&p, p_end);
1100 if (service_type < 0)
1102 provider_name = getstr8(&p, p_end);
1105 name = getstr8(&p, p_end);
1107 AVProgram *program = av_new_program(ts->stream, sid);
1109 av_metadata_set(&program->metadata, "name", name);
1110 av_metadata_set(&program->metadata, "provider_name", provider_name);
1114 av_free(provider_name);
1125 /* handle one TS packet */
1126 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1128 AVFormatContext *s = ts->stream;
1130 int len, pid, cc, cc_ok, afc, is_start;
1131 const uint8_t *p, *p_end;
1134 pid = AV_RB16(packet + 1) & 0x1fff;
1135 if(pid && discard_pid(ts, pid))
1137 is_start = packet[1] & 0x40;
1138 tss = ts->pids[pid];
1139 if (ts->auto_guess && tss == NULL && is_start) {
1140 add_pes_stream(ts, pid, -1);
1141 tss = ts->pids[pid];
1146 /* continuity check (currently not used) */
1147 cc = (packet[3] & 0xf);
1148 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1151 /* skip adaptation field */
1152 afc = (packet[3] >> 4) & 3;
1154 if (afc == 0) /* reserved value */
1156 if (afc == 2) /* adaptation field only */
1159 /* skip adapation field */
1162 /* if past the end of packet, ignore */
1163 p_end = packet + TS_PACKET_SIZE;
1167 pos = url_ftell(ts->stream->pb);
1168 ts->pos47= pos % ts->raw_packet_size;
1170 if (tss->type == MPEGTS_SECTION) {
1172 /* pointer field present */
1174 if (p + len > p_end)
1177 /* write remaining section bytes */
1178 write_section_data(s, tss,
1180 /* check whether filter has been closed */
1186 write_section_data(s, tss,
1191 write_section_data(s, tss,
1197 // Note: The position here points actually behind the current packet.
1198 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1199 pos - ts->raw_packet_size)) < 0)
1206 /* XXX: try to find a better synchro over several packets (use
1207 get_packet_size() ?) */
1208 static int mpegts_resync(AVFormatContext *s)
1210 ByteIOContext *pb = s->pb;
1213 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1218 url_fseek(pb, -1, SEEK_CUR);
1222 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1227 /* return -1 if error or EOF. Return 0 if OK. */
1228 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1230 ByteIOContext *pb = s->pb;
1234 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1235 if (len != TS_PACKET_SIZE)
1236 return AVERROR(EIO);
1237 /* check paquet sync byte */
1238 if (buf[0] != 0x47) {
1239 /* find a new packet start */
1240 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1241 if (mpegts_resync(s) < 0)
1242 return AVERROR(EAGAIN);
1246 skip = raw_packet_size - TS_PACKET_SIZE;
1248 url_fskip(pb, skip);
1255 static int handle_packets(MpegTSContext *ts, int nb_packets)
1257 AVFormatContext *s = ts->stream;
1258 uint8_t packet[TS_PACKET_SIZE];
1259 int packet_num, ret;
1264 if (ts->stop_parse>0)
1267 if (nb_packets != 0 && packet_num >= nb_packets)
1269 ret = read_packet(s, packet, ts->raw_packet_size);
1272 ret = handle_packet(ts, packet);
1279 static int mpegts_probe(AVProbeData *p)
1282 const int size= p->buf_size;
1283 int score, fec_score, dvhs_score;
1284 int check_count= size / TS_FEC_PACKET_SIZE;
1285 #define CHECK_COUNT 10
1287 if (check_count < CHECK_COUNT)
1290 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1291 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1292 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1293 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1295 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1296 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1297 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1298 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1301 /* only use the extension for safer guess */
1302 if (match_ext(p->filename, "ts"))
1303 return AVPROBE_SCORE_MAX;
1309 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1310 (-1) if not available */
1311 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1312 const uint8_t *packet)
1314 int afc, len, flags;
1318 afc = (packet[3] >> 4) & 3;
1328 if (!(flags & 0x10))
1333 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1334 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1338 static int mpegts_read_header(AVFormatContext *s,
1339 AVFormatParameters *ap)
1341 MpegTSContext *ts = s->priv_data;
1342 ByteIOContext *pb = s->pb;
1343 uint8_t buf[5*1024];
1348 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1349 if(ap->mpeg2ts_raw){
1350 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1355 /* read the first 1024 bytes to get packet size */
1356 pos = url_ftell(pb);
1357 len = get_buffer(pb, buf, sizeof(buf));
1358 if (len != sizeof(buf))
1360 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1361 if (ts->raw_packet_size <= 0)
1366 if (s->iformat == &mpegts_demuxer) {
1369 /* first do a scaning to get all the services */
1370 url_fseek(pb, pos, SEEK_SET);
1372 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1374 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1376 handle_packets(ts, s->probesize / ts->raw_packet_size);
1377 /* if could not find service, enable auto_guess */
1381 dprintf(ts->stream, "tuning done\n");
1383 s->ctx_flags |= AVFMTCTX_NOHEADER;
1386 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1387 int64_t pcrs[2], pcr_h;
1388 int packet_count[2];
1389 uint8_t packet[TS_PACKET_SIZE];
1391 /* only read packets */
1393 st = av_new_stream(s, 0);
1396 av_set_pts_info(st, 60, 1, 27000000);
1397 st->codec->codec_type = CODEC_TYPE_DATA;
1398 st->codec->codec_id = CODEC_ID_MPEG2TS;
1400 /* we iterate until we find two PCRs to estimate the bitrate */
1405 ret = read_packet(s, packet, ts->raw_packet_size);
1408 pid = AV_RB16(packet + 1) & 0x1fff;
1409 if ((pcr_pid == -1 || pcr_pid == pid) &&
1410 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1412 packet_count[nb_pcrs] = nb_packets;
1413 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1421 /* NOTE1: the bitrate is computed without the FEC */
1422 /* NOTE2: it is only the bitrate of the start of the stream */
1423 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1424 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1425 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1426 st->codec->bit_rate = s->bit_rate;
1427 st->start_time = ts->cur_pcr;
1429 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1430 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1434 url_fseek(pb, pos, SEEK_SET);
1440 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1442 static int mpegts_raw_read_packet(AVFormatContext *s,
1445 MpegTSContext *ts = s->priv_data;
1447 int64_t pcr_h, next_pcr_h, pos;
1448 int pcr_l, next_pcr_l;
1449 uint8_t pcr_buf[12];
1451 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1452 return AVERROR(ENOMEM);
1453 pkt->pos= url_ftell(s->pb);
1454 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1456 av_free_packet(pkt);
1459 if (ts->mpeg2ts_compute_pcr) {
1460 /* compute exact PCR for each packet */
1461 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1462 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1463 pos = url_ftell(s->pb);
1464 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1465 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1466 get_buffer(s->pb, pcr_buf, 12);
1467 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1468 /* XXX: not precise enough */
1469 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1474 url_fseek(s->pb, pos, SEEK_SET);
1475 /* no next PCR found: we use previous increment */
1476 ts->cur_pcr = pcr_h * 300 + pcr_l;
1478 pkt->pts = ts->cur_pcr;
1479 pkt->duration = ts->pcr_incr;
1480 ts->cur_pcr += ts->pcr_incr;
1482 pkt->stream_index = 0;
1486 static int mpegts_read_packet(AVFormatContext *s,
1489 MpegTSContext *ts = s->priv_data;
1492 if (url_ftell(s->pb) != ts->last_pos) {
1493 /* seek detected, flush pes buffer */
1494 for (i = 0; i < NB_PID_MAX; i++) {
1495 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1496 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1497 av_freep(&pes->buffer);
1498 pes->data_index = 0;
1499 pes->state = MPEGTS_SKIP; /* skip until pes header */
1505 ret = handle_packets(ts, 0);
1507 /* flush pes data left */
1508 for (i = 0; i < NB_PID_MAX; i++) {
1509 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1510 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1511 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1512 new_pes_packet(pes, pkt);
1513 pes->state = MPEGTS_SKIP;
1521 ts->last_pos = url_ftell(s->pb);
1526 static int mpegts_read_close(AVFormatContext *s)
1528 MpegTSContext *ts = s->priv_data;
1533 for(i=0;i<NB_PID_MAX;i++)
1534 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1539 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1540 int64_t *ppos, int64_t pos_limit)
1542 MpegTSContext *ts = s->priv_data;
1543 int64_t pos, timestamp;
1544 uint8_t buf[TS_PACKET_SIZE];
1545 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1546 const int find_next= 1;
1547 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1550 url_fseek(s->pb, pos, SEEK_SET);
1551 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1552 return AV_NOPTS_VALUE;
1553 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1554 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1557 pos += ts->raw_packet_size;
1561 pos -= ts->raw_packet_size;
1563 return AV_NOPTS_VALUE;
1564 url_fseek(s->pb, pos, SEEK_SET);
1565 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1566 return AV_NOPTS_VALUE;
1567 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1568 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1578 #ifdef USE_SYNCPOINT_SEARCH
1580 static int read_seek2(AVFormatContext *s,
1589 int64_t ts_ret, ts_adj;
1590 int stream_index_gen_search;
1592 AVParserState *backup;
1594 backup = ff_store_parser_state(s);
1596 // detect direction of seeking for search purposes
1597 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1598 AVSEEK_FLAG_BACKWARD : 0;
1600 if (flags & AVSEEK_FLAG_BYTE) {
1601 // use position directly, we will search starting from it
1604 // search for some position with good timestamp match
1605 if (stream_index < 0) {
1606 stream_index_gen_search = av_find_default_stream_index(s);
1607 if (stream_index_gen_search < 0) {
1608 ff_restore_parser_state(s, backup);
1612 st = s->streams[stream_index_gen_search];
1613 // timestamp for default must be expressed in AV_TIME_BASE units
1614 ts_adj = av_rescale(target_ts,
1616 AV_TIME_BASE * (int64_t)st->time_base.num);
1619 stream_index_gen_search = stream_index;
1621 pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1625 flags, &ts_ret, mpegts_get_pcr);
1627 ff_restore_parser_state(s, backup);
1632 // search for actual matching keyframe/starting position for all streams
1633 if (ff_gen_syncpoint_search(s, stream_index, pos,
1634 min_ts, target_ts, max_ts,
1636 ff_restore_parser_state(s, backup);
1640 ff_free_parser_state(s, backup);
1644 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1647 if (flags & AVSEEK_FLAG_BACKWARD) {
1648 flags &= ~AVSEEK_FLAG_BACKWARD;
1649 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1651 // for compatibility reasons, seek to the best-fitting timestamp
1652 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1654 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1656 // for compatibility reasons, seek to the best-fitting timestamp
1657 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1664 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1665 MpegTSContext *ts = s->priv_data;
1666 uint8_t buf[TS_PACKET_SIZE];
1669 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1672 pos= url_ftell(s->pb);
1675 url_fseek(s->pb, pos, SEEK_SET);
1676 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1678 // pid = AV_RB16(buf + 1) & 0x1fff;
1679 if(buf[1] & 0x40) break;
1680 pos += ts->raw_packet_size;
1682 url_fseek(s->pb, pos, SEEK_SET);
1689 /**************************************************************/
1690 /* parsing functions - called from other demuxers such as RTP */
1692 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1696 ts = av_mallocz(sizeof(MpegTSContext));
1699 /* no stream case, currently used by RTP */
1700 ts->raw_packet_size = TS_PACKET_SIZE;
1706 /* return the consumed length if a packet was output, or -1 if no
1708 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1709 const uint8_t *buf, int len)
1717 if (ts->stop_parse>0)
1719 if (len < TS_PACKET_SIZE)
1721 if (buf[0] != 0x47) {
1725 handle_packet(ts, buf);
1726 buf += TS_PACKET_SIZE;
1727 len -= TS_PACKET_SIZE;
1733 void ff_mpegts_parse_close(MpegTSContext *ts)
1737 for(i=0;i<NB_PID_MAX;i++)
1738 av_free(ts->pids[i]);
1742 AVInputFormat mpegts_demuxer = {
1744 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1745 sizeof(MpegTSContext),
1752 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1753 #ifdef USE_SYNCPOINT_SEARCH
1754 .read_seek2 = read_seek2,
1758 AVInputFormat mpegtsraw_demuxer = {
1760 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1761 sizeof(MpegTSContext),
1764 mpegts_raw_read_packet,
1768 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1769 #ifdef USE_SYNCPOINT_SEARCH
1770 .read_seek2 = read_seek2,