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
38 #define REGISTRATION_DESCRIPTOR 5
40 #define MAX_PES_PAYLOAD 200*1024
42 typedef struct PESContext PESContext;
44 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
45 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
47 enum MpegTSFilterType {
52 typedef struct MpegTSFilter MpegTSFilter;
54 typedef void PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
56 typedef struct MpegTSPESFilter {
61 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
63 typedef void SetServiceCallback(void *opaque, int ret);
65 typedef struct MpegTSSectionFilter {
69 unsigned int check_crc:1;
70 unsigned int end_of_section_reached:1;
71 SectionCallback *section_cb;
73 } MpegTSSectionFilter;
77 int last_cc; /* last cc code (-1 if first packet) */
78 enum MpegTSFilterType type;
80 MpegTSPESFilter pes_filter;
81 MpegTSSectionFilter section_filter;
85 #define MAX_PIDS_PER_PROGRAM 64
87 unsigned int id; //program id/service id
89 unsigned int pids[MAX_PIDS_PER_PROGRAM];
92 struct MpegTSContext {
94 AVFormatContext *stream;
95 /** raw packet size, including FEC if present */
100 /** if true, all pids are analyzed to find streams */
103 /** compute exact PCR for each transport stream packet */
104 int mpeg2ts_compute_pcr;
106 int64_t cur_pcr; /**< used to estimate the exact PCR */
107 int pcr_incr; /**< used to estimate the exact PCR */
109 /* data needed to handle file based ts */
110 /** stop parsing loop */
112 /** packet containing Audio/Video data */
114 /** to detect seek */
117 /******************************************/
118 /* private mpegts data */
120 /** structure to keep track of Program->pids mapping */
125 /** filters for various streams specified by PMT + for the PAT and PMT */
126 MpegTSFilter *pids[NB_PID_MAX];
129 /* TS stream handling */
133 MPEGTS_PESHEADER_FILL,
138 /* enough for PES header + length */
139 #define PES_START_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 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
490 MpegTSContext *ts = filter->u.section_filter.opaque;
491 SectionHeader h1, *h = &h1;
494 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
495 int program_info_length, pcr_pid, pid, stream_type;
496 int desc_list_len, desc_len, desc_tag;
497 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
498 char language[4] = {0}; /* initialize to kill warnings */
499 int has_hdmv_descr = 0;
500 int has_dirac_descr = 0;
501 uint32_t reg_desc = 0; /* registration descriptor */
504 dprintf(ts->stream, "PMT: len %i\n", section_len);
505 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
508 p_end = section + section_len - 4;
510 if (parse_section_header(h, &p, p_end) < 0)
513 dprintf(ts->stream, "sid=0x%x sec_num=%d/%d\n",
514 h->id, h->sec_num, h->last_sec_num);
516 if (h->tid != PMT_TID)
519 clear_program(ts, h->id);
520 pcr_pid = get16(&p, p_end) & 0x1fff;
523 add_pid_to_pmt(ts, h->id, pcr_pid);
525 dprintf(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
527 program_info_length = get16(&p, p_end) & 0xfff;
528 if (program_info_length < 0)
530 while(program_info_length >= 2) {
532 tag = get8(&p, p_end);
533 len = get8(&p, p_end);
534 if(len > program_info_length - 2)
535 //something else is broken, exit the program_descriptors_loop
537 program_info_length -= len + 2;
538 if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
539 reg_desc = bytestream_get_le32(&p);
541 if(reg_desc == AV_RL32("HDMV"))
546 p += program_info_length;
552 stream_type = get8(&p, p_end);
555 pid = get16(&p, p_end) & 0x1fff;
558 desc_list_len = get16(&p, p_end) & 0xfff;
559 if (desc_list_len < 0)
561 desc_list_end = p + desc_list_len;
562 if (desc_list_end > p_end)
565 desc_tag = get8(&p, desc_list_end);
568 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
569 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
570 /*assume DVB AC-3 Audio*/
571 stream_type = STREAM_TYPE_AUDIO_AC3;
572 } else if(desc_tag == 0x7B) {
574 stream_type = STREAM_TYPE_AUDIO_DTS;
577 desc_len = get8(&p, desc_list_end);
580 desc_end = p + desc_len;
581 if (desc_end > desc_list_end)
584 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
588 case DVB_SUBT_DESCID:
589 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
590 stream_type = STREAM_TYPE_SUBTITLE_DVB;
592 language[0] = get8(&p, desc_end);
593 language[1] = get8(&p, desc_end);
594 language[2] = get8(&p, desc_end);
597 comp_page = get16(&p, desc_end);
598 anc_page = get16(&p, desc_end);
601 case 0x0a: /* ISO 639 language descriptor */
602 language[0] = get8(&p, desc_end);
603 language[1] = get8(&p, desc_end);
604 language[2] = get8(&p, desc_end);
607 case REGISTRATION_DESCRIPTOR: /*MPEG-2 Registration descriptor */
608 reg_desc = bytestream_get_le32(&p);
609 if(reg_desc == AV_RL32("drac"))
611 else if(reg_desc == AV_RL32("AC-3"))
612 stream_type = STREAM_TYPE_AUDIO_AC3;
621 dprintf(ts->stream, "stream_type=%x pid=0x%x\n",
624 /* now create ffmpeg stream */
625 switch(stream_type) {
626 case STREAM_TYPE_AUDIO_MPEG1:
627 case STREAM_TYPE_AUDIO_MPEG2:
628 case STREAM_TYPE_VIDEO_MPEG1:
629 case STREAM_TYPE_VIDEO_MPEG2:
630 case STREAM_TYPE_VIDEO_MPEG4:
631 case STREAM_TYPE_VIDEO_H264:
632 case STREAM_TYPE_VIDEO_VC1:
633 case STREAM_TYPE_VIDEO_DIRAC:
634 case STREAM_TYPE_AUDIO_AAC:
635 case STREAM_TYPE_AUDIO_AC3:
636 case STREAM_TYPE_AUDIO_DTS:
637 case STREAM_TYPE_AUDIO_HDMV_DTS:
638 case STREAM_TYPE_SUBTITLE_DVB:
639 if((stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
640 || (stream_type == STREAM_TYPE_VIDEO_DIRAC && !has_dirac_descr))
642 if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
643 pes= ts->pids[pid]->u.pes_filter.opaque;
646 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
647 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
649 st = new_pes_av_stream(pes, 0);
651 add_pid_to_pmt(ts, h->id, pid);
653 av_program_add_stream_index(ts->stream, h->id, st->index);
656 /* we ignore the other streams */
661 if (language[0] != 0) {
662 av_metadata_set(&st->metadata, "language", language);
665 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
666 st->codec->sub_id = (anc_page << 16) | comp_page;
670 /* all parameters are there */
672 mpegts_close_filter(ts, filter);
675 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
677 MpegTSContext *ts = filter->u.section_filter.opaque;
678 SectionHeader h1, *h = &h1;
679 const uint8_t *p, *p_end;
683 dprintf(ts->stream, "PAT:\n");
684 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
686 p_end = section + section_len - 4;
688 if (parse_section_header(h, &p, p_end) < 0)
690 if (h->tid != PAT_TID)
695 sid = get16(&p, p_end);
698 pmt_pid = get16(&p, p_end) & 0x1fff;
702 dprintf(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
707 av_new_program(ts->stream, sid);
709 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
710 add_pat_entry(ts, sid);
711 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
712 add_pid_to_pmt(ts, sid, pmt_pid);
718 mpegts_close_filter(ts, filter);
721 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
723 MpegTSContext *ts = filter->u.section_filter.opaque;
724 SectionHeader h1, *h = &h1;
725 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
726 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
727 char *name, *provider_name;
730 dprintf(ts->stream, "SDT:\n");
731 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
734 p_end = section + section_len - 4;
736 if (parse_section_header(h, &p, p_end) < 0)
738 if (h->tid != SDT_TID)
740 onid = get16(&p, p_end);
743 val = get8(&p, p_end);
747 sid = get16(&p, p_end);
750 val = get8(&p, p_end);
753 desc_list_len = get16(&p, p_end) & 0xfff;
754 if (desc_list_len < 0)
756 desc_list_end = p + desc_list_len;
757 if (desc_list_end > p_end)
760 desc_tag = get8(&p, desc_list_end);
763 desc_len = get8(&p, desc_list_end);
764 desc_end = p + desc_len;
765 if (desc_end > desc_list_end)
768 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
773 service_type = get8(&p, p_end);
774 if (service_type < 0)
776 provider_name = getstr8(&p, p_end);
779 name = getstr8(&p, p_end);
781 AVProgram *program = av_new_program(ts->stream, sid);
783 av_metadata_set(&program->metadata, "name", name);
784 av_metadata_set(&program->metadata, "provider_name", provider_name);
788 av_free(provider_name);
799 static int64_t get_pts(const uint8_t *p)
801 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
802 pts |= (AV_RB16(p + 1) >> 1) << 15;
803 pts |= AV_RB16(p + 3) >> 1;
807 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
811 pkt->destruct = av_destruct_packet;
812 pkt->data = pes->buffer;
813 pkt->size = pes->data_index;
814 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
816 pkt->stream_index = pes->st->index;
819 /* store position of first TS packet of this PES packet */
820 pkt->pos = pes->ts_packet_pos;
822 /* reset pts values */
823 pes->pts = AV_NOPTS_VALUE;
824 pes->dts = AV_NOPTS_VALUE;
829 /* return non zero if a packet could be constructed */
830 static void mpegts_push_data(MpegTSFilter *filter,
831 const uint8_t *buf, int buf_size, int is_start,
834 PESContext *pes = filter->u.pes_filter.opaque;
835 MpegTSContext *ts = pes->ts;
843 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
844 new_pes_packet(pes, ts->pkt);
847 pes->state = MPEGTS_HEADER;
849 pes->ts_packet_pos = pos;
852 while (buf_size > 0) {
855 len = PES_START_SIZE - pes->data_index;
858 memcpy(pes->header + pes->data_index, p, len);
859 pes->data_index += len;
862 if (pes->data_index == PES_START_SIZE) {
863 /* we got all the PES or section header. We can now
866 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
868 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
869 pes->header[2] == 0x01) {
870 /* it must be an mpeg2 PES stream */
871 code = pes->header[3] | 0x100;
873 !((code >= 0x1c0 && code <= 0x1df) ||
874 (code >= 0x1e0 && code <= 0x1ef) ||
875 (code == 0x1bd) || (code == 0x1fd)))
877 pes->state = MPEGTS_PESHEADER_FILL;
878 pes->total_size = AV_RB16(pes->header + 4);
879 /* NOTE: a zero total size means the PES size is
881 pes->pes_header_size = pes->header[8] + 9;
883 /* otherwise, it should be a table */
886 pes->state = MPEGTS_SKIP;
891 /**********************************************/
892 /* PES packing parsing */
893 case MPEGTS_PESHEADER_FILL:
894 len = pes->pes_header_size - pes->data_index;
897 memcpy(pes->header + pes->data_index, p, len);
898 pes->data_index += len;
901 if (pes->data_index == pes->pes_header_size) {
905 flags = pes->header[7];
907 pes->pts = AV_NOPTS_VALUE;
908 pes->dts = AV_NOPTS_VALUE;
909 if ((flags & 0xc0) == 0x80) {
910 pes->dts = pes->pts = get_pts(r);
912 } else if ((flags & 0xc0) == 0xc0) {
913 pes->pts = get_pts(r);
915 pes->dts = get_pts(r);
919 if (pes->total_size > pes->data_index - 6)
920 pes->total_size -= pes->data_index - 6;
922 pes->total_size = MAX_PES_PAYLOAD;
923 /* allocate pes buffer */
924 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
928 /* we got the full header. We parse it and get the payload */
929 pes->state = MPEGTS_PAYLOAD;
935 if (pes->data_index+buf_size > pes->total_size) {
936 new_pes_packet(pes, ts->pkt);
937 pes->total_size = MAX_PES_PAYLOAD;
938 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
943 memcpy(pes->buffer+pes->data_index, p, buf_size);
944 pes->data_index += buf_size;
955 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
958 enum CodecID codec_id;
959 enum CodecType codec_type;
961 switch(pes->stream_type){
962 case STREAM_TYPE_AUDIO_MPEG1:
963 case STREAM_TYPE_AUDIO_MPEG2:
964 codec_type = CODEC_TYPE_AUDIO;
965 codec_id = CODEC_ID_MP3;
967 case STREAM_TYPE_VIDEO_MPEG1:
968 case STREAM_TYPE_VIDEO_MPEG2:
969 codec_type = CODEC_TYPE_VIDEO;
970 codec_id = CODEC_ID_MPEG2VIDEO;
972 case STREAM_TYPE_VIDEO_MPEG4:
973 codec_type = CODEC_TYPE_VIDEO;
974 codec_id = CODEC_ID_MPEG4;
976 case STREAM_TYPE_VIDEO_H264:
977 codec_type = CODEC_TYPE_VIDEO;
978 codec_id = CODEC_ID_H264;
980 case STREAM_TYPE_VIDEO_VC1:
981 codec_type = CODEC_TYPE_VIDEO;
982 codec_id = CODEC_ID_VC1;
984 case STREAM_TYPE_VIDEO_DIRAC:
985 codec_type = CODEC_TYPE_VIDEO;
986 codec_id = CODEC_ID_DIRAC;
988 case STREAM_TYPE_AUDIO_AAC:
989 codec_type = CODEC_TYPE_AUDIO;
990 codec_id = CODEC_ID_AAC;
992 case STREAM_TYPE_AUDIO_AC3:
993 codec_type = CODEC_TYPE_AUDIO;
994 codec_id = CODEC_ID_AC3;
996 case STREAM_TYPE_AUDIO_DTS:
997 case STREAM_TYPE_AUDIO_HDMV_DTS:
998 codec_type = CODEC_TYPE_AUDIO;
999 codec_id = CODEC_ID_DTS;
1001 case STREAM_TYPE_SUBTITLE_DVB:
1002 codec_type = CODEC_TYPE_SUBTITLE;
1003 codec_id = CODEC_ID_DVB_SUBTITLE;
1006 if (code >= 0x1c0 && code <= 0x1df) {
1007 codec_type = CODEC_TYPE_AUDIO;
1008 codec_id = CODEC_ID_MP2;
1009 } else if (code == 0x1bd) {
1010 codec_type = CODEC_TYPE_AUDIO;
1011 codec_id = CODEC_ID_AC3;
1013 codec_type = CODEC_TYPE_VIDEO;
1014 codec_id = CODEC_ID_PROBE;
1018 st = av_new_stream(pes->stream, pes->pid);
1020 av_set_pts_info(st, 33, 1, 90000);
1021 st->priv_data = pes;
1022 st->codec->codec_type = codec_type;
1023 st->codec->codec_id = codec_id;
1024 st->need_parsing = AVSTREAM_PARSE_FULL;
1031 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1036 /* if no pid found, then add a pid context */
1037 pes = av_mallocz(sizeof(PESContext));
1041 pes->stream = ts->stream;
1043 pes->pcr_pid = pcr_pid;
1044 pes->stream_type = stream_type;
1045 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1053 /* handle one TS packet */
1054 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
1056 AVFormatContext *s = ts->stream;
1058 int len, pid, cc, cc_ok, afc, is_start;
1059 const uint8_t *p, *p_end;
1062 pid = AV_RB16(packet + 1) & 0x1fff;
1063 if(pid && discard_pid(ts, pid))
1065 is_start = packet[1] & 0x40;
1066 tss = ts->pids[pid];
1067 if (ts->auto_guess && tss == NULL && is_start) {
1068 add_pes_stream(ts, pid, -1, 0);
1069 tss = ts->pids[pid];
1074 /* continuity check (currently not used) */
1075 cc = (packet[3] & 0xf);
1076 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1079 /* skip adaptation field */
1080 afc = (packet[3] >> 4) & 3;
1082 if (afc == 0) /* reserved value */
1084 if (afc == 2) /* adaptation field only */
1087 /* skip adapation field */
1090 /* if past the end of packet, ignore */
1091 p_end = packet + TS_PACKET_SIZE;
1095 pos = url_ftell(ts->stream->pb);
1096 ts->pos47= pos % ts->raw_packet_size;
1098 if (tss->type == MPEGTS_SECTION) {
1100 /* pointer field present */
1102 if (p + len > p_end)
1105 /* write remaining section bytes */
1106 write_section_data(s, tss,
1108 /* check whether filter has been closed */
1114 write_section_data(s, tss,
1119 write_section_data(s, tss,
1124 // Note: The position here points actually behind the current packet.
1125 tss->u.pes_filter.pes_cb(tss,
1126 p, p_end - p, is_start, pos - ts->raw_packet_size);
1130 /* XXX: try to find a better synchro over several packets (use
1131 get_packet_size() ?) */
1132 static int mpegts_resync(ByteIOContext *pb)
1136 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1141 url_fseek(pb, -1, SEEK_CUR);
1149 /* return -1 if error or EOF. Return 0 if OK. */
1150 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1155 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1156 if (len != TS_PACKET_SIZE)
1157 return AVERROR(EIO);
1158 /* check paquet sync byte */
1159 if (buf[0] != 0x47) {
1160 /* find a new packet start */
1161 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1162 if (mpegts_resync(pb) < 0)
1163 return AVERROR_INVALIDDATA;
1167 skip = raw_packet_size - TS_PACKET_SIZE;
1169 url_fskip(pb, skip);
1176 static int handle_packets(MpegTSContext *ts, int nb_packets)
1178 AVFormatContext *s = ts->stream;
1179 ByteIOContext *pb = s->pb;
1180 uint8_t packet[TS_PACKET_SIZE];
1181 int packet_num, ret;
1186 if (ts->stop_parse>0)
1189 if (nb_packets != 0 && packet_num >= nb_packets)
1191 ret = read_packet(pb, packet, ts->raw_packet_size);
1194 handle_packet(ts, packet);
1199 static int mpegts_probe(AVProbeData *p)
1202 const int size= p->buf_size;
1203 int score, fec_score, dvhs_score;
1204 int check_count= size / TS_FEC_PACKET_SIZE;
1205 #define CHECK_COUNT 10
1207 if (check_count < CHECK_COUNT)
1210 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1211 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1212 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1213 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1215 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1216 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1217 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1218 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1221 /* only use the extension for safer guess */
1222 if (match_ext(p->filename, "ts"))
1223 return AVPROBE_SCORE_MAX;
1229 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1230 (-1) if not available */
1231 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1232 const uint8_t *packet)
1234 int afc, len, flags;
1238 afc = (packet[3] >> 4) & 3;
1248 if (!(flags & 0x10))
1253 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1254 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1258 static int mpegts_read_header(AVFormatContext *s,
1259 AVFormatParameters *ap)
1261 MpegTSContext *ts = s->priv_data;
1262 ByteIOContext *pb = s->pb;
1263 uint8_t buf[5*1024];
1268 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1269 if(ap->mpeg2ts_raw){
1270 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1275 /* read the first 1024 bytes to get packet size */
1276 pos = url_ftell(pb);
1277 len = get_buffer(pb, buf, sizeof(buf));
1278 if (len != sizeof(buf))
1280 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1281 if (ts->raw_packet_size <= 0)
1286 if (s->iformat == &mpegts_demuxer) {
1289 /* first do a scaning to get all the services */
1290 url_fseek(pb, pos, SEEK_SET);
1292 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1294 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1296 handle_packets(ts, s->probesize);
1297 /* if could not find service, enable auto_guess */
1301 dprintf(ts->stream, "tuning done\n");
1303 s->ctx_flags |= AVFMTCTX_NOHEADER;
1306 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1307 int64_t pcrs[2], pcr_h;
1308 int packet_count[2];
1309 uint8_t packet[TS_PACKET_SIZE];
1311 /* only read packets */
1313 st = av_new_stream(s, 0);
1316 av_set_pts_info(st, 60, 1, 27000000);
1317 st->codec->codec_type = CODEC_TYPE_DATA;
1318 st->codec->codec_id = CODEC_ID_MPEG2TS;
1320 /* we iterate until we find two PCRs to estimate the bitrate */
1325 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1328 pid = AV_RB16(packet + 1) & 0x1fff;
1329 if ((pcr_pid == -1 || pcr_pid == pid) &&
1330 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1332 packet_count[nb_pcrs] = nb_packets;
1333 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1341 /* NOTE1: the bitrate is computed without the FEC */
1342 /* NOTE2: it is only the bitrate of the start of the stream */
1343 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1344 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1345 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1346 st->codec->bit_rate = s->bit_rate;
1347 st->start_time = ts->cur_pcr;
1349 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1350 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1354 url_fseek(pb, pos, SEEK_SET);
1360 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1362 static int mpegts_raw_read_packet(AVFormatContext *s,
1365 MpegTSContext *ts = s->priv_data;
1367 int64_t pcr_h, next_pcr_h, pos;
1368 int pcr_l, next_pcr_l;
1369 uint8_t pcr_buf[12];
1371 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1372 return AVERROR(ENOMEM);
1373 pkt->pos= url_ftell(s->pb);
1374 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1376 av_free_packet(pkt);
1379 if (ts->mpeg2ts_compute_pcr) {
1380 /* compute exact PCR for each packet */
1381 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1382 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1383 pos = url_ftell(s->pb);
1384 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1385 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1386 get_buffer(s->pb, pcr_buf, 12);
1387 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1388 /* XXX: not precise enough */
1389 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1394 url_fseek(s->pb, pos, SEEK_SET);
1395 /* no next PCR found: we use previous increment */
1396 ts->cur_pcr = pcr_h * 300 + pcr_l;
1398 pkt->pts = ts->cur_pcr;
1399 pkt->duration = ts->pcr_incr;
1400 ts->cur_pcr += ts->pcr_incr;
1402 pkt->stream_index = 0;
1406 static int mpegts_read_packet(AVFormatContext *s,
1409 MpegTSContext *ts = s->priv_data;
1412 if (url_ftell(s->pb) != ts->last_pos) {
1413 /* seek detected, flush pes buffer */
1414 for (i = 0; i < NB_PID_MAX; i++) {
1415 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1416 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1417 av_freep(&pes->buffer);
1418 pes->data_index = 0;
1419 pes->state = MPEGTS_SKIP; /* skip until pes header */
1425 ret = handle_packets(ts, 0);
1427 /* flush pes data left */
1428 for (i = 0; i < NB_PID_MAX; i++) {
1429 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1430 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1431 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1432 new_pes_packet(pes, pkt);
1440 ts->last_pos = url_ftell(s->pb);
1445 static int mpegts_read_close(AVFormatContext *s)
1447 MpegTSContext *ts = s->priv_data;
1452 for(i=0;i<NB_PID_MAX;i++)
1453 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1458 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1459 int64_t *ppos, int64_t pos_limit)
1461 MpegTSContext *ts = s->priv_data;
1462 int64_t pos, timestamp;
1463 uint8_t buf[TS_PACKET_SIZE];
1464 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1465 const int find_next= 1;
1466 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1469 url_fseek(s->pb, pos, SEEK_SET);
1470 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1471 return AV_NOPTS_VALUE;
1472 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1473 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1476 pos += ts->raw_packet_size;
1480 pos -= ts->raw_packet_size;
1482 return AV_NOPTS_VALUE;
1483 url_fseek(s->pb, pos, SEEK_SET);
1484 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1485 return AV_NOPTS_VALUE;
1486 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1487 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1497 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1498 MpegTSContext *ts = s->priv_data;
1499 uint8_t buf[TS_PACKET_SIZE];
1502 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1505 pos= url_ftell(s->pb);
1508 url_fseek(s->pb, pos, SEEK_SET);
1509 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1511 // pid = AV_RB16(buf + 1) & 0x1fff;
1512 if(buf[1] & 0x40) break;
1513 pos += ts->raw_packet_size;
1515 url_fseek(s->pb, pos, SEEK_SET);
1520 /**************************************************************/
1521 /* parsing functions - called from other demuxers such as RTP */
1523 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1527 ts = av_mallocz(sizeof(MpegTSContext));
1530 /* no stream case, currently used by RTP */
1531 ts->raw_packet_size = TS_PACKET_SIZE;
1537 /* return the consumed length if a packet was output, or -1 if no
1539 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1540 const uint8_t *buf, int len)
1548 if (ts->stop_parse>0)
1550 if (len < TS_PACKET_SIZE)
1552 if (buf[0] != 0x47) {
1556 handle_packet(ts, buf);
1557 buf += TS_PACKET_SIZE;
1558 len -= TS_PACKET_SIZE;
1564 void mpegts_parse_close(MpegTSContext *ts)
1568 for(i=0;i<NB_PID_MAX;i++)
1569 av_free(ts->pids[i]);
1573 AVInputFormat mpegts_demuxer = {
1575 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1576 sizeof(MpegTSContext),
1583 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1586 AVInputFormat mpegtsraw_demuxer = {
1588 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1589 sizeof(MpegTSContext),
1592 mpegts_raw_read_packet,
1596 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,