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 */
132 MPEGTS_PESHEADER_FILL,
137 /* enough for PES header + length */
138 #define PES_START_SIZE 6
139 #define PES_HEADER_SIZE 9
140 #define MAX_PES_HEADER_SIZE (9 + 255)
144 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
147 AVFormatContext *stream;
149 enum MpegTSState state;
150 /* used to get the format */
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[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 { 0x1b, CODEC_TYPE_VIDEO, CODEC_ID_H264 },
501 { 0xd1, CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
502 { 0xea, CODEC_TYPE_VIDEO, CODEC_ID_VC1 },
506 static const StreamType HDMV_types[] = {
507 { 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
508 { 0x82, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
513 static const StreamType MISC_types[] = {
514 { 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
515 { 0x8a, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
519 static const StreamType REGD_types[] = {
520 { MKTAG('d','r','a','c'), CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
521 { MKTAG('A','C','-','3'), CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
525 /* descriptor present */
526 static const StreamType DESC_types[] = {
527 { 0x6a, CODEC_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
528 { 0x7a, CODEC_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
529 { 0x7b, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
530 { 0x59, CODEC_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
533 static void mpegts_find_stream_type(AVStream *st,
534 uint32_t stream_type, const StreamType *types)
536 for (; types->stream_type; types++) {
537 if (stream_type == types->stream_type) {
538 st->codec->codec_type = types->codec_type;
539 st->codec->codec_id = types->codec_id;
545 static AVStream *new_pes_av_stream(PESContext *pes, uint32_t prog_reg_desc, uint32_t code)
547 AVStream *st = av_new_stream(pes->stream, pes->pid);
552 av_set_pts_info(st, 33, 1, 90000);
554 st->codec->codec_type = CODEC_TYPE_DATA;
555 st->codec->codec_id = CODEC_ID_PROBE;
556 st->need_parsing = AVSTREAM_PARSE_FULL;
559 dprintf(pes->stream, "stream_type=%x pid=%x prog_reg_desc=%.4s\n",
560 pes->stream_type, pes->pid, (char*)&prog_reg_desc);
562 st->codec->codec_tag = pes->stream_type;
564 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
565 if (prog_reg_desc == AV_RL32("HDMV") &&
566 st->codec->codec_id == CODEC_ID_PROBE)
567 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
568 if (st->codec->codec_id == CODEC_ID_PROBE)
569 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
571 /* stream was not present in PMT, guess based on PES start code */
572 if (st->codec->codec_id == CODEC_ID_PROBE) {
573 if (code >= 0x1c0 && code <= 0x1df) {
574 st->codec->codec_type = CODEC_TYPE_AUDIO;
575 st->codec->codec_id = CODEC_ID_MP2;
576 } else if (code == 0x1bd) {
577 st->codec->codec_type = CODEC_TYPE_AUDIO;
578 st->codec->codec_id = CODEC_ID_AC3;
585 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
587 MpegTSContext *ts = filter->u.section_filter.opaque;
588 SectionHeader h1, *h = &h1;
591 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
592 int program_info_length, pcr_pid, pid, stream_type;
593 int desc_list_len, desc_len, desc_tag;
594 int comp_page, anc_page;
596 uint32_t prog_reg_desc = 0; /* registration descriptor */
599 dprintf(ts->stream, "PMT: len %i\n", section_len);
600 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
603 p_end = section + section_len - 4;
605 if (parse_section_header(h, &p, p_end) < 0)
608 dprintf(ts->stream, "sid=0x%x sec_num=%d/%d\n",
609 h->id, h->sec_num, h->last_sec_num);
611 if (h->tid != PMT_TID)
614 clear_program(ts, h->id);
615 pcr_pid = get16(&p, p_end) & 0x1fff;
618 add_pid_to_pmt(ts, h->id, pcr_pid);
620 dprintf(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
622 program_info_length = get16(&p, p_end) & 0xfff;
623 if (program_info_length < 0)
625 while(program_info_length >= 2) {
627 tag = get8(&p, p_end);
628 len = get8(&p, p_end);
629 if(len > program_info_length - 2)
630 //something else is broken, exit the program_descriptors_loop
632 program_info_length -= len + 2;
633 if(tag == 0x05 && len >= 4) { // registration descriptor
634 prog_reg_desc = bytestream_get_le32(&p);
639 p += program_info_length;
644 stream_type = get8(&p, p_end);
647 pid = get16(&p, p_end) & 0x1fff;
651 /* now create ffmpeg stream */
652 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
653 pes = ts->pids[pid]->u.pes_filter.opaque;
656 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
657 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
659 st = new_pes_av_stream(pes, prog_reg_desc, 0);
665 add_pid_to_pmt(ts, h->id, pid);
667 av_program_add_stream_index(ts->stream, h->id, st->index);
669 desc_list_len = get16(&p, p_end) & 0xfff;
670 if (desc_list_len < 0)
672 desc_list_end = p + desc_list_len;
673 if (desc_list_end > p_end)
676 desc_tag = get8(&p, desc_list_end);
679 desc_len = get8(&p, desc_list_end);
682 desc_end = p + desc_len;
683 if (desc_end > desc_list_end)
686 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
689 if (st->codec->codec_id == CODEC_ID_PROBE &&
690 stream_type == STREAM_TYPE_PRIVATE_DATA)
691 mpegts_find_stream_type(st, desc_tag, DESC_types);
694 case 0x59: /* subtitling descriptor */
695 language[0] = get8(&p, desc_end);
696 language[1] = get8(&p, desc_end);
697 language[2] = get8(&p, desc_end);
700 comp_page = get16(&p, desc_end);
701 anc_page = get16(&p, desc_end);
702 st->codec->sub_id = (anc_page << 16) | comp_page;
703 av_metadata_set(&st->metadata, "language", language);
705 case 0x0a: /* ISO 639 language descriptor */
706 language[0] = get8(&p, desc_end);
707 language[1] = get8(&p, desc_end);
708 language[2] = get8(&p, desc_end);
710 av_metadata_set(&st->metadata, "language", language);
712 case 0x05: /* registration descriptor */
713 st->codec->codec_tag = bytestream_get_le32(&p);
714 dprintf(ts->stream, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
715 if (st->codec->codec_id == CODEC_ID_PROBE &&
716 stream_type == STREAM_TYPE_PRIVATE_DATA)
717 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
726 /* all parameters are there */
728 mpegts_close_filter(ts, filter);
731 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
733 MpegTSContext *ts = filter->u.section_filter.opaque;
734 SectionHeader h1, *h = &h1;
735 const uint8_t *p, *p_end;
739 dprintf(ts->stream, "PAT:\n");
740 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
742 p_end = section + section_len - 4;
744 if (parse_section_header(h, &p, p_end) < 0)
746 if (h->tid != PAT_TID)
751 sid = get16(&p, p_end);
754 pmt_pid = get16(&p, p_end) & 0x1fff;
758 dprintf(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
763 av_new_program(ts->stream, sid);
765 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
766 add_pat_entry(ts, sid);
767 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
768 add_pid_to_pmt(ts, sid, pmt_pid);
774 mpegts_close_filter(ts, filter);
777 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
779 MpegTSContext *ts = filter->u.section_filter.opaque;
780 SectionHeader h1, *h = &h1;
781 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
782 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
783 char *name, *provider_name;
786 dprintf(ts->stream, "SDT:\n");
787 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
790 p_end = section + section_len - 4;
792 if (parse_section_header(h, &p, p_end) < 0)
794 if (h->tid != SDT_TID)
796 onid = get16(&p, p_end);
799 val = get8(&p, p_end);
803 sid = get16(&p, p_end);
806 val = get8(&p, p_end);
809 desc_list_len = get16(&p, p_end) & 0xfff;
810 if (desc_list_len < 0)
812 desc_list_end = p + desc_list_len;
813 if (desc_list_end > p_end)
816 desc_tag = get8(&p, desc_list_end);
819 desc_len = get8(&p, desc_list_end);
820 desc_end = p + desc_len;
821 if (desc_end > desc_list_end)
824 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
829 service_type = get8(&p, p_end);
830 if (service_type < 0)
832 provider_name = getstr8(&p, p_end);
835 name = getstr8(&p, p_end);
837 AVProgram *program = av_new_program(ts->stream, sid);
839 av_metadata_set(&program->metadata, "name", name);
840 av_metadata_set(&program->metadata, "provider_name", provider_name);
844 av_free(provider_name);
855 static int64_t get_pts(const uint8_t *p)
857 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
858 pts |= (AV_RB16(p + 1) >> 1) << 15;
859 pts |= AV_RB16(p + 3) >> 1;
863 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
867 pkt->destruct = av_destruct_packet;
868 pkt->data = pes->buffer;
869 pkt->size = pes->data_index;
870 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
872 pkt->stream_index = pes->st->index;
875 /* store position of first TS packet of this PES packet */
876 pkt->pos = pes->ts_packet_pos;
878 /* reset pts values */
879 pes->pts = AV_NOPTS_VALUE;
880 pes->dts = AV_NOPTS_VALUE;
885 /* return non zero if a packet could be constructed */
886 static int mpegts_push_data(MpegTSFilter *filter,
887 const uint8_t *buf, int buf_size, int is_start,
890 PESContext *pes = filter->u.pes_filter.opaque;
891 MpegTSContext *ts = pes->ts;
899 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
900 new_pes_packet(pes, ts->pkt);
903 pes->state = MPEGTS_HEADER;
905 pes->ts_packet_pos = pos;
908 while (buf_size > 0) {
911 len = PES_START_SIZE - pes->data_index;
914 memcpy(pes->header + pes->data_index, p, len);
915 pes->data_index += len;
918 if (pes->data_index == PES_START_SIZE) {
919 /* we got all the PES or section header. We can now
922 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
924 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
925 pes->header[2] == 0x01) {
926 /* it must be an mpeg2 PES stream */
927 code = pes->header[3] | 0x100;
928 dprintf(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
930 if ((!pes->st && pes->stream->nb_streams == MAX_STREAMS) ||
931 (pes->st && pes->st->discard == AVDISCARD_ALL) ||
932 code == 0x1be) /* padding_stream */
935 /* stream not present in PMT */
937 pes->st = new_pes_av_stream(pes, 0, code);
939 return AVERROR(ENOMEM);
941 pes->total_size = AV_RB16(pes->header + 4);
942 /* NOTE: a zero total size means the PES size is
944 if (!pes->total_size)
945 pes->total_size = MAX_PES_PAYLOAD;
947 /* allocate pes buffer */
948 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
950 return AVERROR(ENOMEM);
952 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
953 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
954 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
955 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
956 pes->state = MPEGTS_PESHEADER;
958 pes->state = MPEGTS_PAYLOAD;
962 /* otherwise, it should be a table */
965 pes->state = MPEGTS_SKIP;
970 /**********************************************/
971 /* PES packing parsing */
972 case MPEGTS_PESHEADER:
973 len = PES_HEADER_SIZE - pes->data_index;
978 memcpy(pes->header + pes->data_index, p, len);
979 pes->data_index += len;
982 if (pes->data_index == PES_HEADER_SIZE) {
983 pes->pes_header_size = pes->header[8] + 9;
984 pes->state = MPEGTS_PESHEADER_FILL;
987 case MPEGTS_PESHEADER_FILL:
988 len = pes->pes_header_size - pes->data_index;
993 memcpy(pes->header + pes->data_index, p, len);
994 pes->data_index += len;
997 if (pes->data_index == pes->pes_header_size) {
1001 flags = pes->header[7];
1002 r = pes->header + 9;
1003 pes->pts = AV_NOPTS_VALUE;
1004 pes->dts = AV_NOPTS_VALUE;
1005 if ((flags & 0xc0) == 0x80) {
1006 pes->dts = pes->pts = get_pts(r);
1008 } else if ((flags & 0xc0) == 0xc0) {
1009 pes->pts = get_pts(r);
1011 pes->dts = get_pts(r);
1015 /* we got the full header. We parse it and get the payload */
1016 pes->state = MPEGTS_PAYLOAD;
1017 pes->data_index = 0;
1020 case MPEGTS_PAYLOAD:
1022 if (pes->data_index+buf_size > pes->total_size) {
1023 new_pes_packet(pes, ts->pkt);
1024 pes->total_size = MAX_PES_PAYLOAD;
1025 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
1027 return AVERROR(ENOMEM);
1030 memcpy(pes->buffer+pes->data_index, p, buf_size);
1031 pes->data_index += buf_size;
1044 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1049 /* if no pid found, then add a pid context */
1050 pes = av_mallocz(sizeof(PESContext));
1054 pes->stream = ts->stream;
1056 pes->pcr_pid = pcr_pid;
1057 pes->stream_type = stream_type;
1058 pes->state = MPEGTS_SKIP;
1059 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1067 /* handle one TS packet */
1068 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1070 AVFormatContext *s = ts->stream;
1072 int len, pid, cc, cc_ok, afc, is_start;
1073 const uint8_t *p, *p_end;
1076 pid = AV_RB16(packet + 1) & 0x1fff;
1077 if(pid && discard_pid(ts, pid))
1079 is_start = packet[1] & 0x40;
1080 tss = ts->pids[pid];
1081 if (ts->auto_guess && tss == NULL && is_start) {
1082 add_pes_stream(ts, pid, -1, 0);
1083 tss = ts->pids[pid];
1088 /* continuity check (currently not used) */
1089 cc = (packet[3] & 0xf);
1090 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1093 /* skip adaptation field */
1094 afc = (packet[3] >> 4) & 3;
1096 if (afc == 0) /* reserved value */
1098 if (afc == 2) /* adaptation field only */
1101 /* skip adapation field */
1104 /* if past the end of packet, ignore */
1105 p_end = packet + TS_PACKET_SIZE;
1109 pos = url_ftell(ts->stream->pb);
1110 ts->pos47= pos % ts->raw_packet_size;
1112 if (tss->type == MPEGTS_SECTION) {
1114 /* pointer field present */
1116 if (p + len > p_end)
1119 /* write remaining section bytes */
1120 write_section_data(s, tss,
1122 /* check whether filter has been closed */
1128 write_section_data(s, tss,
1133 write_section_data(s, tss,
1139 // Note: The position here points actually behind the current packet.
1140 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1141 pos - ts->raw_packet_size)) < 0)
1148 /* XXX: try to find a better synchro over several packets (use
1149 get_packet_size() ?) */
1150 static int mpegts_resync(ByteIOContext *pb)
1154 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1159 url_fseek(pb, -1, SEEK_CUR);
1167 /* return -1 if error or EOF. Return 0 if OK. */
1168 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1173 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1174 if (len != TS_PACKET_SIZE)
1175 return AVERROR(EIO);
1176 /* check paquet sync byte */
1177 if (buf[0] != 0x47) {
1178 /* find a new packet start */
1179 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1180 if (mpegts_resync(pb) < 0)
1181 return AVERROR_INVALIDDATA;
1185 skip = raw_packet_size - TS_PACKET_SIZE;
1187 url_fskip(pb, skip);
1194 static int handle_packets(MpegTSContext *ts, int nb_packets)
1196 AVFormatContext *s = ts->stream;
1197 ByteIOContext *pb = s->pb;
1198 uint8_t packet[TS_PACKET_SIZE];
1199 int packet_num, ret;
1204 if (ts->stop_parse>0)
1207 if (nb_packets != 0 && packet_num >= nb_packets)
1209 ret = read_packet(pb, packet, ts->raw_packet_size);
1212 ret = handle_packet(ts, packet);
1219 static int mpegts_probe(AVProbeData *p)
1222 const int size= p->buf_size;
1223 int score, fec_score, dvhs_score;
1224 int check_count= size / TS_FEC_PACKET_SIZE;
1225 #define CHECK_COUNT 10
1227 if (check_count < CHECK_COUNT)
1230 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1231 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1232 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1233 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1235 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1236 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1237 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1238 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1241 /* only use the extension for safer guess */
1242 if (match_ext(p->filename, "ts"))
1243 return AVPROBE_SCORE_MAX;
1249 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1250 (-1) if not available */
1251 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1252 const uint8_t *packet)
1254 int afc, len, flags;
1258 afc = (packet[3] >> 4) & 3;
1268 if (!(flags & 0x10))
1273 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1274 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1278 static int mpegts_read_header(AVFormatContext *s,
1279 AVFormatParameters *ap)
1281 MpegTSContext *ts = s->priv_data;
1282 ByteIOContext *pb = s->pb;
1283 uint8_t buf[5*1024];
1288 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1289 if(ap->mpeg2ts_raw){
1290 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1295 /* read the first 1024 bytes to get packet size */
1296 pos = url_ftell(pb);
1297 len = get_buffer(pb, buf, sizeof(buf));
1298 if (len != sizeof(buf))
1300 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1301 if (ts->raw_packet_size <= 0)
1306 if (s->iformat == &mpegts_demuxer) {
1309 /* first do a scaning to get all the services */
1310 url_fseek(pb, pos, SEEK_SET);
1312 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1314 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1316 handle_packets(ts, s->probesize);
1317 /* if could not find service, enable auto_guess */
1321 dprintf(ts->stream, "tuning done\n");
1323 s->ctx_flags |= AVFMTCTX_NOHEADER;
1326 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1327 int64_t pcrs[2], pcr_h;
1328 int packet_count[2];
1329 uint8_t packet[TS_PACKET_SIZE];
1331 /* only read packets */
1333 st = av_new_stream(s, 0);
1336 av_set_pts_info(st, 60, 1, 27000000);
1337 st->codec->codec_type = CODEC_TYPE_DATA;
1338 st->codec->codec_id = CODEC_ID_MPEG2TS;
1340 /* we iterate until we find two PCRs to estimate the bitrate */
1345 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1348 pid = AV_RB16(packet + 1) & 0x1fff;
1349 if ((pcr_pid == -1 || pcr_pid == pid) &&
1350 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1352 packet_count[nb_pcrs] = nb_packets;
1353 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1361 /* NOTE1: the bitrate is computed without the FEC */
1362 /* NOTE2: it is only the bitrate of the start of the stream */
1363 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1364 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1365 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1366 st->codec->bit_rate = s->bit_rate;
1367 st->start_time = ts->cur_pcr;
1369 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1370 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1374 url_fseek(pb, pos, SEEK_SET);
1380 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1382 static int mpegts_raw_read_packet(AVFormatContext *s,
1385 MpegTSContext *ts = s->priv_data;
1387 int64_t pcr_h, next_pcr_h, pos;
1388 int pcr_l, next_pcr_l;
1389 uint8_t pcr_buf[12];
1391 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1392 return AVERROR(ENOMEM);
1393 pkt->pos= url_ftell(s->pb);
1394 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1396 av_free_packet(pkt);
1399 if (ts->mpeg2ts_compute_pcr) {
1400 /* compute exact PCR for each packet */
1401 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1402 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1403 pos = url_ftell(s->pb);
1404 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1405 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1406 get_buffer(s->pb, pcr_buf, 12);
1407 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1408 /* XXX: not precise enough */
1409 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1414 url_fseek(s->pb, pos, SEEK_SET);
1415 /* no next PCR found: we use previous increment */
1416 ts->cur_pcr = pcr_h * 300 + pcr_l;
1418 pkt->pts = ts->cur_pcr;
1419 pkt->duration = ts->pcr_incr;
1420 ts->cur_pcr += ts->pcr_incr;
1422 pkt->stream_index = 0;
1426 static int mpegts_read_packet(AVFormatContext *s,
1429 MpegTSContext *ts = s->priv_data;
1432 if (url_ftell(s->pb) != ts->last_pos) {
1433 /* seek detected, flush pes buffer */
1434 for (i = 0; i < NB_PID_MAX; i++) {
1435 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1436 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1437 av_freep(&pes->buffer);
1438 pes->data_index = 0;
1439 pes->state = MPEGTS_SKIP; /* skip until pes header */
1445 ret = handle_packets(ts, 0);
1447 /* flush pes data left */
1448 for (i = 0; i < NB_PID_MAX; i++) {
1449 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1450 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1451 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1452 new_pes_packet(pes, pkt);
1460 ts->last_pos = url_ftell(s->pb);
1465 static int mpegts_read_close(AVFormatContext *s)
1467 MpegTSContext *ts = s->priv_data;
1472 for(i=0;i<NB_PID_MAX;i++)
1473 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1478 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1479 int64_t *ppos, int64_t pos_limit)
1481 MpegTSContext *ts = s->priv_data;
1482 int64_t pos, timestamp;
1483 uint8_t buf[TS_PACKET_SIZE];
1484 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1485 const int find_next= 1;
1486 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1489 url_fseek(s->pb, pos, SEEK_SET);
1490 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1491 return AV_NOPTS_VALUE;
1492 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1493 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1496 pos += ts->raw_packet_size;
1500 pos -= ts->raw_packet_size;
1502 return AV_NOPTS_VALUE;
1503 url_fseek(s->pb, pos, SEEK_SET);
1504 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1505 return AV_NOPTS_VALUE;
1506 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1507 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1517 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1518 MpegTSContext *ts = s->priv_data;
1519 uint8_t buf[TS_PACKET_SIZE];
1522 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1525 pos= url_ftell(s->pb);
1528 url_fseek(s->pb, pos, SEEK_SET);
1529 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1531 // pid = AV_RB16(buf + 1) & 0x1fff;
1532 if(buf[1] & 0x40) break;
1533 pos += ts->raw_packet_size;
1535 url_fseek(s->pb, pos, SEEK_SET);
1540 /**************************************************************/
1541 /* parsing functions - called from other demuxers such as RTP */
1543 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1547 ts = av_mallocz(sizeof(MpegTSContext));
1550 /* no stream case, currently used by RTP */
1551 ts->raw_packet_size = TS_PACKET_SIZE;
1557 /* return the consumed length if a packet was output, or -1 if no
1559 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1560 const uint8_t *buf, int len)
1568 if (ts->stop_parse>0)
1570 if (len < TS_PACKET_SIZE)
1572 if (buf[0] != 0x47) {
1576 handle_packet(ts, buf);
1577 buf += TS_PACKET_SIZE;
1578 len -= TS_PACKET_SIZE;
1584 void mpegts_parse_close(MpegTSContext *ts)
1588 for(i=0;i<NB_PID_MAX;i++)
1589 av_free(ts->pids[i]);
1593 AVInputFormat mpegts_demuxer = {
1595 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1596 sizeof(MpegTSContext),
1603 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1606 AVInputFormat mpegtsraw_demuxer = {
1608 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1609 sizeof(MpegTSContext),
1612 mpegts_raw_read_packet,
1616 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,