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
25 #include "libavutil/crc.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavcodec/bytestream.h"
32 /* 1.0 second at 24Mbit/s */
33 #define MAX_SCAN_PACKETS 32000
35 /* maximum size in which we look for synchronisation if
36 synchronisation is lost */
37 #define MAX_RESYNC_SIZE 4096
39 #define MAX_PES_PAYLOAD 200*1024
41 typedef struct PESContext PESContext;
43 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
45 enum MpegTSFilterType {
50 typedef struct MpegTSFilter MpegTSFilter;
52 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
54 typedef struct MpegTSPESFilter {
59 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
61 typedef void SetServiceCallback(void *opaque, int ret);
63 typedef struct MpegTSSectionFilter {
67 unsigned int check_crc:1;
68 unsigned int end_of_section_reached:1;
69 SectionCallback *section_cb;
71 } MpegTSSectionFilter;
75 int last_cc; /* last cc code (-1 if first packet) */
76 enum MpegTSFilterType type;
78 MpegTSPESFilter pes_filter;
79 MpegTSSectionFilter section_filter;
83 #define MAX_PIDS_PER_PROGRAM 64
85 unsigned int id; //program id/service id
87 unsigned int pids[MAX_PIDS_PER_PROGRAM];
90 struct MpegTSContext {
92 AVFormatContext *stream;
93 /** raw packet size, including FEC if present */
98 /** if true, all pids are analyzed to find streams */
101 /** compute exact PCR for each transport stream packet */
102 int mpeg2ts_compute_pcr;
104 int64_t cur_pcr; /**< used to estimate the exact PCR */
105 int pcr_incr; /**< used to estimate the exact PCR */
107 /* data needed to handle file based ts */
108 /** stop parsing loop */
110 /** packet containing Audio/Video data */
112 /** to detect seek */
115 /******************************************/
116 /* private mpegts data */
118 /** structure to keep track of Program->pids mapping */
123 /** filters for various streams specified by PMT + for the PAT and PMT */
124 MpegTSFilter *pids[NB_PID_MAX];
127 /* TS stream handling */
131 MPEGTS_PESHEADER_FILL,
136 /* enough for PES header + length */
137 #define PES_START_SIZE 9
138 #define MAX_PES_HEADER_SIZE (9 + 255)
142 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
145 AVFormatContext *stream;
147 enum MpegTSState state;
148 /* used to get the format */
153 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
154 uint8_t header[MAX_PES_HEADER_SIZE];
158 extern AVInputFormat mpegts_demuxer;
160 static void clear_program(MpegTSContext *ts, unsigned int programid)
164 for(i=0; i<ts->nb_prg; i++)
165 if(ts->prg[i].id == programid)
166 ts->prg[i].nb_pids = 0;
169 static void clear_programs(MpegTSContext *ts)
175 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
178 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
182 p = &ts->prg[ts->nb_prg];
188 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
191 struct Program *p = NULL;
192 for(i=0; i<ts->nb_prg; i++) {
193 if(ts->prg[i].id == programid) {
201 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
203 p->pids[p->nb_pids++] = pid;
207 * \brief discard_pid() decides if the pid is to be discarded according
208 * to caller's programs selection
209 * \param ts : - TS context
211 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
214 static int discard_pid(MpegTSContext *ts, unsigned int pid)
217 int used = 0, discarded = 0;
219 for(i=0; i<ts->nb_prg; i++) {
221 for(j=0; j<p->nb_pids; j++) {
222 if(p->pids[j] != pid)
224 //is program with id p->id set to be discarded?
225 for(k=0; k<ts->stream->nb_programs; k++) {
226 if(ts->stream->programs[k]->id == p->id) {
227 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
236 return !used && discarded;
240 * Assembles PES packets out of TS packets, and then calls the "section_cb"
241 * function when they are complete.
243 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
244 const uint8_t *buf, int buf_size, int is_start)
246 MpegTSSectionFilter *tss = &tss1->u.section_filter;
250 memcpy(tss->section_buf, buf, buf_size);
251 tss->section_index = buf_size;
252 tss->section_h_size = -1;
253 tss->end_of_section_reached = 0;
255 if (tss->end_of_section_reached)
257 len = 4096 - tss->section_index;
260 memcpy(tss->section_buf + tss->section_index, buf, len);
261 tss->section_index += len;
264 /* compute section length if possible */
265 if (tss->section_h_size == -1 && tss->section_index >= 3) {
266 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
269 tss->section_h_size = len;
272 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
273 tss->end_of_section_reached = 1;
274 if (!tss->check_crc ||
275 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
276 tss->section_buf, tss->section_h_size) == 0)
277 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
281 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
282 SectionCallback *section_cb, void *opaque,
286 MpegTSFilter *filter;
287 MpegTSSectionFilter *sec;
289 dprintf(ts->stream, "Filter: pid=0x%x\n", pid);
291 if (pid >= NB_PID_MAX || ts->pids[pid])
293 filter = av_mallocz(sizeof(MpegTSFilter));
296 ts->pids[pid] = filter;
297 filter->type = MPEGTS_SECTION;
299 filter->last_cc = -1;
300 sec = &filter->u.section_filter;
301 sec->section_cb = section_cb;
302 sec->opaque = opaque;
303 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
304 sec->check_crc = check_crc;
305 if (!sec->section_buf) {
312 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
316 MpegTSFilter *filter;
317 MpegTSPESFilter *pes;
319 if (pid >= NB_PID_MAX || ts->pids[pid])
321 filter = av_mallocz(sizeof(MpegTSFilter));
324 ts->pids[pid] = filter;
325 filter->type = MPEGTS_PES;
327 filter->last_cc = -1;
328 pes = &filter->u.pes_filter;
329 pes->pes_cb = pes_cb;
330 pes->opaque = opaque;
334 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
339 if (filter->type == MPEGTS_SECTION)
340 av_freep(&filter->u.section_filter.section_buf);
341 else if (filter->type == MPEGTS_PES) {
342 PESContext *pes = filter->u.pes_filter.opaque;
343 av_freep(&pes->buffer);
344 /* referenced private data will be freed later in
345 * av_close_input_stream */
346 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
347 av_freep(&filter->u.pes_filter.opaque);
352 ts->pids[pid] = NULL;
355 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
356 int stat[packet_size];
361 memset(stat, 0, packet_size*sizeof(int));
363 for(x=i=0; i<size-3; i++){
364 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
366 if(stat[x] > best_score){
373 if(x == packet_size) x= 0;
379 /* autodetect fec presence. Must have at least 1024 bytes */
380 static int get_packet_size(const uint8_t *buf, int size)
382 int score, fec_score, dvhs_score;
384 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
387 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
388 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
389 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
390 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
392 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
393 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
394 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
398 typedef struct SectionHeader {
403 uint8_t last_sec_num;
406 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
419 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
425 if ((p + 1) >= p_end)
433 /* read and allocate a DVB string preceeded by its length */
434 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
441 len = get8(&p, p_end);
444 if ((p + len) > p_end)
446 str = av_malloc(len + 1);
456 static int parse_section_header(SectionHeader *h,
457 const uint8_t **pp, const uint8_t *p_end)
461 val = get8(pp, p_end);
466 val = get16(pp, p_end);
470 val = get8(pp, p_end);
473 h->version = (val >> 1) & 0x1f;
474 val = get8(pp, p_end);
478 val = get8(pp, p_end);
481 h->last_sec_num = val;
486 uint32_t stream_type;
487 enum CodecType codec_type;
488 enum CodecID codec_id;
491 static const StreamType ISO_types[] = {
492 { 0x01, CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
493 { 0x02, CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
494 { 0x03, CODEC_TYPE_AUDIO, CODEC_ID_MP3 },
495 { 0x04, CODEC_TYPE_AUDIO, CODEC_ID_MP3 },
496 { 0x0f, CODEC_TYPE_AUDIO, CODEC_ID_AAC },
497 { 0x10, CODEC_TYPE_VIDEO, CODEC_ID_MPEG4 },
498 { 0x1b, CODEC_TYPE_VIDEO, CODEC_ID_H264 },
499 { 0xd1, CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
500 { 0xea, CODEC_TYPE_VIDEO, CODEC_ID_VC1 },
504 static const StreamType HDMV_types[] = {
505 { 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
506 { 0x82, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
511 static const StreamType MISC_types[] = {
512 { 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
513 { 0x8a, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
514 {0x100, CODEC_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, // demuxer internal
518 static const StreamType REGD_types[] = {
519 { MKTAG('d','r','a','c'), CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
520 { MKTAG('A','C','-','3'), CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
524 /* descriptor present */
525 static const StreamType DESC_types[] = {
526 { 0x6a, CODEC_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
527 { 0x7a, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
528 { 0x7b, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
529 { 0x59, CODEC_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
532 static void mpegts_find_stream_type(AVStream *st,
533 uint32_t stream_type, const StreamType *types)
535 for (; types->stream_type; types++) {
536 if (stream_type == types->stream_type) {
537 st->codec->codec_type = types->codec_type;
538 st->codec->codec_id = types->codec_id;
544 static AVStream *new_pes_av_stream(PESContext *pes, uint32_t prog_reg_desc)
546 AVStream *st = av_new_stream(pes->stream, pes->pid);
551 av_set_pts_info(st, 33, 1, 90000);
553 st->codec->codec_type = CODEC_TYPE_DATA;
554 st->codec->codec_id = CODEC_ID_PROBE;
555 st->need_parsing = AVSTREAM_PARSE_FULL;
558 dprintf(pes->stream, "stream_type=%x pid=%x prog_reg_desc=%.4s\n",
559 pes->stream_type, pes->pid, (char*)&prog_reg_desc);
561 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
562 if (prog_reg_desc == AV_RL32("HDMV") &&
563 st->codec->codec_id == CODEC_ID_PROBE)
564 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
565 if (st->codec->codec_id == CODEC_ID_PROBE)
566 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
571 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
573 MpegTSContext *ts = filter->u.section_filter.opaque;
574 SectionHeader h1, *h = &h1;
577 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
578 int program_info_length, pcr_pid, pid, stream_type;
579 int desc_list_len, desc_len, desc_tag;
580 int comp_page, anc_page;
582 uint32_t prog_reg_desc = 0; /* registration descriptor */
583 uint32_t reg_desc; /* registration descriptor */
586 dprintf(ts->stream, "PMT: len %i\n", section_len);
587 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
590 p_end = section + section_len - 4;
592 if (parse_section_header(h, &p, p_end) < 0)
595 dprintf(ts->stream, "sid=0x%x sec_num=%d/%d\n",
596 h->id, h->sec_num, h->last_sec_num);
598 if (h->tid != PMT_TID)
601 clear_program(ts, h->id);
602 pcr_pid = get16(&p, p_end) & 0x1fff;
605 add_pid_to_pmt(ts, h->id, pcr_pid);
607 dprintf(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
609 program_info_length = get16(&p, p_end) & 0xfff;
610 if (program_info_length < 0)
612 while(program_info_length >= 2) {
614 tag = get8(&p, p_end);
615 len = get8(&p, p_end);
616 if(len > program_info_length - 2)
617 //something else is broken, exit the program_descriptors_loop
619 program_info_length -= len + 2;
620 if(tag == 0x05 && len >= 4) { // registration descriptor
621 prog_reg_desc = bytestream_get_le32(&p);
626 p += program_info_length;
631 stream_type = get8(&p, p_end);
634 pid = get16(&p, p_end) & 0x1fff;
638 /* now create ffmpeg stream */
639 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
640 pes = ts->pids[pid]->u.pes_filter.opaque;
643 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
644 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
646 st = new_pes_av_stream(pes, prog_reg_desc);
652 add_pid_to_pmt(ts, h->id, pid);
654 av_program_add_stream_index(ts->stream, h->id, st->index);
656 desc_list_len = get16(&p, p_end) & 0xfff;
657 if (desc_list_len < 0)
659 desc_list_end = p + desc_list_len;
660 if (desc_list_end > p_end)
663 desc_tag = get8(&p, desc_list_end);
666 desc_len = get8(&p, desc_list_end);
669 desc_end = p + desc_len;
670 if (desc_end > desc_list_end)
673 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
676 if (st->codec->codec_id == CODEC_ID_PROBE &&
677 stream_type == STREAM_TYPE_PRIVATE_DATA)
678 mpegts_find_stream_type(st, desc_tag, DESC_types);
681 case 0x59: /* subtitling descriptor */
682 language[0] = get8(&p, desc_end);
683 language[1] = get8(&p, desc_end);
684 language[2] = get8(&p, desc_end);
687 comp_page = get16(&p, desc_end);
688 anc_page = get16(&p, desc_end);
689 st->codec->sub_id = (anc_page << 16) | comp_page;
690 av_metadata_set(&st->metadata, "language", language);
692 case 0x0a: /* ISO 639 language descriptor */
693 language[0] = get8(&p, desc_end);
694 language[1] = get8(&p, desc_end);
695 language[2] = get8(&p, desc_end);
697 av_metadata_set(&st->metadata, "language", language);
699 case 0x05: /* registration descriptor */
700 reg_desc = bytestream_get_le32(&p);
701 if (st->codec->codec_id == CODEC_ID_PROBE &&
702 stream_type == STREAM_TYPE_PRIVATE_DATA)
703 mpegts_find_stream_type(st, reg_desc, REGD_types);
712 /* all parameters are there */
714 mpegts_close_filter(ts, filter);
717 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
719 MpegTSContext *ts = filter->u.section_filter.opaque;
720 SectionHeader h1, *h = &h1;
721 const uint8_t *p, *p_end;
725 dprintf(ts->stream, "PAT:\n");
726 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
728 p_end = section + section_len - 4;
730 if (parse_section_header(h, &p, p_end) < 0)
732 if (h->tid != PAT_TID)
737 sid = get16(&p, p_end);
740 pmt_pid = get16(&p, p_end) & 0x1fff;
744 dprintf(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
749 av_new_program(ts->stream, sid);
751 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
752 add_pat_entry(ts, sid);
753 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
754 add_pid_to_pmt(ts, sid, pmt_pid);
760 mpegts_close_filter(ts, filter);
763 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
765 MpegTSContext *ts = filter->u.section_filter.opaque;
766 SectionHeader h1, *h = &h1;
767 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
768 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
769 char *name, *provider_name;
772 dprintf(ts->stream, "SDT:\n");
773 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
776 p_end = section + section_len - 4;
778 if (parse_section_header(h, &p, p_end) < 0)
780 if (h->tid != SDT_TID)
782 onid = get16(&p, p_end);
785 val = get8(&p, p_end);
789 sid = get16(&p, p_end);
792 val = get8(&p, p_end);
795 desc_list_len = get16(&p, p_end) & 0xfff;
796 if (desc_list_len < 0)
798 desc_list_end = p + desc_list_len;
799 if (desc_list_end > p_end)
802 desc_tag = get8(&p, desc_list_end);
805 desc_len = get8(&p, desc_list_end);
806 desc_end = p + desc_len;
807 if (desc_end > desc_list_end)
810 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
815 service_type = get8(&p, p_end);
816 if (service_type < 0)
818 provider_name = getstr8(&p, p_end);
821 name = getstr8(&p, p_end);
823 AVProgram *program = av_new_program(ts->stream, sid);
825 av_metadata_set(&program->metadata, "name", name);
826 av_metadata_set(&program->metadata, "provider_name", provider_name);
830 av_free(provider_name);
841 static int64_t get_pts(const uint8_t *p)
843 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
844 pts |= (AV_RB16(p + 1) >> 1) << 15;
845 pts |= AV_RB16(p + 3) >> 1;
849 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
853 pkt->destruct = av_destruct_packet;
854 pkt->data = pes->buffer;
855 pkt->size = pes->data_index;
856 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
858 pkt->stream_index = pes->st->index;
861 /* store position of first TS packet of this PES packet */
862 pkt->pos = pes->ts_packet_pos;
864 /* reset pts values */
865 pes->pts = AV_NOPTS_VALUE;
866 pes->dts = AV_NOPTS_VALUE;
871 /* return non zero if a packet could be constructed */
872 static int mpegts_push_data(MpegTSFilter *filter,
873 const uint8_t *buf, int buf_size, int is_start,
876 PESContext *pes = filter->u.pes_filter.opaque;
877 MpegTSContext *ts = pes->ts;
885 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
886 new_pes_packet(pes, ts->pkt);
889 pes->state = MPEGTS_HEADER;
891 pes->ts_packet_pos = pos;
894 while (buf_size > 0) {
897 len = PES_START_SIZE - pes->data_index;
900 memcpy(pes->header + pes->data_index, p, len);
901 pes->data_index += len;
904 if (pes->data_index == PES_START_SIZE) {
905 /* we got all the PES or section header. We can now
908 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
910 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
911 pes->header[2] == 0x01) {
912 /* it must be an mpeg2 PES stream */
913 code = pes->header[3] | 0x100;
914 if (!pes->st || pes->st->discard == AVDISCARD_ALL ||
915 !((code >= 0x1c0 && code <= 0x1df) ||
916 (code >= 0x1e0 && code <= 0x1ef) ||
917 (code == 0x1bd) || (code == 0x1fd)))
919 pes->state = MPEGTS_PESHEADER_FILL;
920 pes->total_size = AV_RB16(pes->header + 4);
921 /* NOTE: a zero total size means the PES size is
923 pes->pes_header_size = pes->header[8] + 9;
925 /* otherwise, it should be a table */
928 pes->state = MPEGTS_SKIP;
933 /**********************************************/
934 /* PES packing parsing */
935 case MPEGTS_PESHEADER_FILL:
936 len = pes->pes_header_size - pes->data_index;
941 memcpy(pes->header + pes->data_index, p, len);
942 pes->data_index += len;
945 if (pes->data_index == pes->pes_header_size) {
949 flags = pes->header[7];
951 pes->pts = AV_NOPTS_VALUE;
952 pes->dts = AV_NOPTS_VALUE;
953 if ((flags & 0xc0) == 0x80) {
954 pes->dts = pes->pts = get_pts(r);
956 } else if ((flags & 0xc0) == 0xc0) {
957 pes->pts = get_pts(r);
959 pes->dts = get_pts(r);
963 if (pes->total_size > pes->data_index - 6)
964 pes->total_size -= pes->data_index - 6;
966 pes->total_size = MAX_PES_PAYLOAD;
967 /* allocate pes buffer */
968 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
970 return AVERROR(ENOMEM);
972 /* we got the full header. We parse it and get the payload */
973 pes->state = MPEGTS_PAYLOAD;
979 if (pes->data_index+buf_size > pes->total_size) {
980 new_pes_packet(pes, ts->pkt);
981 pes->total_size = MAX_PES_PAYLOAD;
982 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
984 return AVERROR(ENOMEM);
987 memcpy(pes->buffer+pes->data_index, p, buf_size);
988 pes->data_index += buf_size;
1001 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1006 /* if no pid found, then add a pid context */
1007 pes = av_mallocz(sizeof(PESContext));
1011 pes->stream = ts->stream;
1013 pes->pcr_pid = pcr_pid;
1014 pes->stream_type = stream_type;
1015 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1023 /* handle one TS packet */
1024 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1026 AVFormatContext *s = ts->stream;
1028 int len, pid, cc, cc_ok, afc, is_start;
1029 const uint8_t *p, *p_end;
1032 pid = AV_RB16(packet + 1) & 0x1fff;
1033 if(pid && discard_pid(ts, pid))
1035 is_start = packet[1] & 0x40;
1036 tss = ts->pids[pid];
1037 if (ts->auto_guess && tss == NULL && is_start) {
1038 add_pes_stream(ts, pid, -1, 0);
1039 tss = ts->pids[pid];
1044 /* continuity check (currently not used) */
1045 cc = (packet[3] & 0xf);
1046 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1049 /* skip adaptation field */
1050 afc = (packet[3] >> 4) & 3;
1052 if (afc == 0) /* reserved value */
1054 if (afc == 2) /* adaptation field only */
1057 /* skip adapation field */
1060 /* if past the end of packet, ignore */
1061 p_end = packet + TS_PACKET_SIZE;
1065 pos = url_ftell(ts->stream->pb);
1066 ts->pos47= pos % ts->raw_packet_size;
1068 if (tss->type == MPEGTS_SECTION) {
1070 /* pointer field present */
1072 if (p + len > p_end)
1075 /* write remaining section bytes */
1076 write_section_data(s, tss,
1078 /* check whether filter has been closed */
1084 write_section_data(s, tss,
1089 write_section_data(s, tss,
1095 // Note: The position here points actually behind the current packet.
1096 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1097 pos - ts->raw_packet_size)) < 0)
1104 /* XXX: try to find a better synchro over several packets (use
1105 get_packet_size() ?) */
1106 static int mpegts_resync(ByteIOContext *pb)
1110 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1115 url_fseek(pb, -1, SEEK_CUR);
1123 /* return -1 if error or EOF. Return 0 if OK. */
1124 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1129 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1130 if (len != TS_PACKET_SIZE)
1131 return AVERROR(EIO);
1132 /* check paquet sync byte */
1133 if (buf[0] != 0x47) {
1134 /* find a new packet start */
1135 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1136 if (mpegts_resync(pb) < 0)
1137 return AVERROR_INVALIDDATA;
1141 skip = raw_packet_size - TS_PACKET_SIZE;
1143 url_fskip(pb, skip);
1150 static int handle_packets(MpegTSContext *ts, int nb_packets)
1152 AVFormatContext *s = ts->stream;
1153 ByteIOContext *pb = s->pb;
1154 uint8_t packet[TS_PACKET_SIZE];
1155 int packet_num, ret;
1160 if (ts->stop_parse>0)
1163 if (nb_packets != 0 && packet_num >= nb_packets)
1165 ret = read_packet(pb, packet, ts->raw_packet_size);
1168 ret = handle_packet(ts, packet);
1175 static int mpegts_probe(AVProbeData *p)
1178 const int size= p->buf_size;
1179 int score, fec_score, dvhs_score;
1180 int check_count= size / TS_FEC_PACKET_SIZE;
1181 #define CHECK_COUNT 10
1183 if (check_count < CHECK_COUNT)
1186 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1187 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1188 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1189 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1191 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1192 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1193 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1194 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1197 /* only use the extension for safer guess */
1198 if (match_ext(p->filename, "ts"))
1199 return AVPROBE_SCORE_MAX;
1205 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1206 (-1) if not available */
1207 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1208 const uint8_t *packet)
1210 int afc, len, flags;
1214 afc = (packet[3] >> 4) & 3;
1224 if (!(flags & 0x10))
1229 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1230 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1234 static int mpegts_read_header(AVFormatContext *s,
1235 AVFormatParameters *ap)
1237 MpegTSContext *ts = s->priv_data;
1238 ByteIOContext *pb = s->pb;
1239 uint8_t buf[5*1024];
1244 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1245 if(ap->mpeg2ts_raw){
1246 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1251 /* read the first 1024 bytes to get packet size */
1252 pos = url_ftell(pb);
1253 len = get_buffer(pb, buf, sizeof(buf));
1254 if (len != sizeof(buf))
1256 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1257 if (ts->raw_packet_size <= 0)
1262 if (s->iformat == &mpegts_demuxer) {
1265 /* first do a scaning to get all the services */
1266 url_fseek(pb, pos, SEEK_SET);
1268 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1270 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1272 handle_packets(ts, s->probesize);
1273 /* if could not find service, enable auto_guess */
1277 dprintf(ts->stream, "tuning done\n");
1279 s->ctx_flags |= AVFMTCTX_NOHEADER;
1282 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1283 int64_t pcrs[2], pcr_h;
1284 int packet_count[2];
1285 uint8_t packet[TS_PACKET_SIZE];
1287 /* only read packets */
1289 st = av_new_stream(s, 0);
1292 av_set_pts_info(st, 60, 1, 27000000);
1293 st->codec->codec_type = CODEC_TYPE_DATA;
1294 st->codec->codec_id = CODEC_ID_MPEG2TS;
1296 /* we iterate until we find two PCRs to estimate the bitrate */
1301 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1304 pid = AV_RB16(packet + 1) & 0x1fff;
1305 if ((pcr_pid == -1 || pcr_pid == pid) &&
1306 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1308 packet_count[nb_pcrs] = nb_packets;
1309 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1317 /* NOTE1: the bitrate is computed without the FEC */
1318 /* NOTE2: it is only the bitrate of the start of the stream */
1319 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1320 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1321 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1322 st->codec->bit_rate = s->bit_rate;
1323 st->start_time = ts->cur_pcr;
1325 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1326 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1330 url_fseek(pb, pos, SEEK_SET);
1336 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1338 static int mpegts_raw_read_packet(AVFormatContext *s,
1341 MpegTSContext *ts = s->priv_data;
1343 int64_t pcr_h, next_pcr_h, pos;
1344 int pcr_l, next_pcr_l;
1345 uint8_t pcr_buf[12];
1347 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1348 return AVERROR(ENOMEM);
1349 pkt->pos= url_ftell(s->pb);
1350 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1352 av_free_packet(pkt);
1355 if (ts->mpeg2ts_compute_pcr) {
1356 /* compute exact PCR for each packet */
1357 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1358 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1359 pos = url_ftell(s->pb);
1360 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1361 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1362 get_buffer(s->pb, pcr_buf, 12);
1363 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1364 /* XXX: not precise enough */
1365 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1370 url_fseek(s->pb, pos, SEEK_SET);
1371 /* no next PCR found: we use previous increment */
1372 ts->cur_pcr = pcr_h * 300 + pcr_l;
1374 pkt->pts = ts->cur_pcr;
1375 pkt->duration = ts->pcr_incr;
1376 ts->cur_pcr += ts->pcr_incr;
1378 pkt->stream_index = 0;
1382 static int mpegts_read_packet(AVFormatContext *s,
1385 MpegTSContext *ts = s->priv_data;
1388 if (url_ftell(s->pb) != ts->last_pos) {
1389 /* seek detected, flush pes buffer */
1390 for (i = 0; i < NB_PID_MAX; i++) {
1391 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1392 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1393 av_freep(&pes->buffer);
1394 pes->data_index = 0;
1395 pes->state = MPEGTS_SKIP; /* skip until pes header */
1401 ret = handle_packets(ts, 0);
1403 /* flush pes data left */
1404 for (i = 0; i < NB_PID_MAX; i++) {
1405 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1406 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1407 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1408 new_pes_packet(pes, pkt);
1416 ts->last_pos = url_ftell(s->pb);
1421 static int mpegts_read_close(AVFormatContext *s)
1423 MpegTSContext *ts = s->priv_data;
1428 for(i=0;i<NB_PID_MAX;i++)
1429 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1434 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1435 int64_t *ppos, int64_t pos_limit)
1437 MpegTSContext *ts = s->priv_data;
1438 int64_t pos, timestamp;
1439 uint8_t buf[TS_PACKET_SIZE];
1440 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1441 const int find_next= 1;
1442 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1445 url_fseek(s->pb, pos, SEEK_SET);
1446 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1447 return AV_NOPTS_VALUE;
1448 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1449 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1452 pos += ts->raw_packet_size;
1456 pos -= ts->raw_packet_size;
1458 return AV_NOPTS_VALUE;
1459 url_fseek(s->pb, pos, SEEK_SET);
1460 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1461 return AV_NOPTS_VALUE;
1462 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1463 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1473 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1474 MpegTSContext *ts = s->priv_data;
1475 uint8_t buf[TS_PACKET_SIZE];
1478 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1481 pos= url_ftell(s->pb);
1484 url_fseek(s->pb, pos, SEEK_SET);
1485 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1487 // pid = AV_RB16(buf + 1) & 0x1fff;
1488 if(buf[1] & 0x40) break;
1489 pos += ts->raw_packet_size;
1491 url_fseek(s->pb, pos, SEEK_SET);
1496 /**************************************************************/
1497 /* parsing functions - called from other demuxers such as RTP */
1499 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1503 ts = av_mallocz(sizeof(MpegTSContext));
1506 /* no stream case, currently used by RTP */
1507 ts->raw_packet_size = TS_PACKET_SIZE;
1513 /* return the consumed length if a packet was output, or -1 if no
1515 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1516 const uint8_t *buf, int len)
1524 if (ts->stop_parse>0)
1526 if (len < TS_PACKET_SIZE)
1528 if (buf[0] != 0x47) {
1532 handle_packet(ts, buf);
1533 buf += TS_PACKET_SIZE;
1534 len -= TS_PACKET_SIZE;
1540 void mpegts_parse_close(MpegTSContext *ts)
1544 for(i=0;i<NB_PID_MAX;i++)
1545 av_free(ts->pids[i]);
1549 AVInputFormat mpegts_demuxer = {
1551 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1552 sizeof(MpegTSContext),
1559 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1562 AVInputFormat mpegtsraw_demuxer = {
1564 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1565 sizeof(MpegTSContext),
1568 mpegts_raw_read_packet,
1572 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,