2 * MPEG2 transport stream (aka DVB) demux
3 * Copyright (c) 2002-2003 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 /* 1.0 second at 24Mbit/s */
27 #define MAX_SCAN_PACKETS 32000
29 /* maximum size in which we look for synchronisation if
30 synchronisation is lost */
31 #define MAX_RESYNC_SIZE 4096
33 typedef struct PESContext PESContext;
35 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int stream_type);
36 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
38 enum MpegTSFilterType {
43 typedef void PESCallback(void *opaque, const uint8_t *buf, int len, int is_start);
45 typedef struct MpegTSPESFilter {
50 typedef void SectionCallback(void *opaque, const uint8_t *buf, int len);
52 typedef void SetServiceCallback(void *opaque, int ret);
54 typedef struct MpegTSSectionFilter {
59 int end_of_section_reached:1;
60 SectionCallback *section_cb;
62 } MpegTSSectionFilter;
64 typedef struct MpegTSFilter {
66 int last_cc; /* last cc code (-1 if first packet) */
67 enum MpegTSFilterType type;
69 MpegTSPESFilter pes_filter;
70 MpegTSSectionFilter section_filter;
74 typedef struct MpegTSService {
81 struct MpegTSContext {
83 AVFormatContext *stream;
84 int raw_packet_size; /* raw packet size, including FEC if present */
85 int auto_guess; /* if true, all pids are analized to find streams */
88 int mpeg2ts_raw; /* force raw MPEG2 transport stream output, if possible */
89 int mpeg2ts_compute_pcr; /* compute exact PCR for each transport stream packet */
91 /* used to estimate the exact PCR */
96 /* data needed to handle file based ts */
97 int stop_parse; /* stop parsing loop */
98 AVPacket *pkt; /* packet containing av data */
100 /******************************************/
101 /* private mpegts data */
103 MpegTSFilter *sdt_filter;
105 MpegTSService **services;
107 /* set service context (XXX: allocated it ?) */
108 SetServiceCallback *set_service_cb;
109 void *set_service_opaque;
110 MpegTSFilter *pat_filter;
111 MpegTSFilter *pmt_filter;
114 MpegTSFilter *pids[NB_PID_MAX];
117 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
118 const uint8_t *buf, int buf_size, int is_start)
120 MpegTSSectionFilter *tss = &tss1->u.section_filter;
124 memcpy(tss->section_buf, buf, buf_size);
125 tss->section_index = buf_size;
126 tss->section_h_size = -1;
127 tss->end_of_section_reached = 0;
129 if (tss->end_of_section_reached)
131 len = 4096 - tss->section_index;
134 memcpy(tss->section_buf + tss->section_index, buf, len);
135 tss->section_index += len;
138 /* compute section length if possible */
139 if (tss->section_h_size == -1 && tss->section_index >= 3) {
140 len = (((tss->section_buf[1] & 0xf) << 8) | tss->section_buf[2]) + 3;
143 tss->section_h_size = len;
146 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
147 tss->end_of_section_reached = 1;
148 if (!tss->check_crc ||
149 av_crc(av_crc04C11DB7, -1, tss->section_buf, tss->section_h_size) == 0)
150 tss->section_cb(tss->opaque, tss->section_buf, tss->section_h_size);
154 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
155 SectionCallback *section_cb, void *opaque,
159 MpegTSFilter *filter;
160 MpegTSSectionFilter *sec;
163 printf("Filter: pid=0x%x\n", pid);
165 if (pid >= NB_PID_MAX || ts->pids[pid])
167 filter = av_mallocz(sizeof(MpegTSFilter));
170 ts->pids[pid] = filter;
171 filter->type = MPEGTS_SECTION;
173 filter->last_cc = -1;
174 sec = &filter->u.section_filter;
175 sec->section_cb = section_cb;
176 sec->opaque = opaque;
177 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
178 sec->check_crc = check_crc;
179 if (!sec->section_buf) {
186 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
190 MpegTSFilter *filter;
191 MpegTSPESFilter *pes;
193 if (pid >= NB_PID_MAX || ts->pids[pid])
195 filter = av_mallocz(sizeof(MpegTSFilter));
198 ts->pids[pid] = filter;
199 filter->type = MPEGTS_PES;
201 filter->last_cc = -1;
202 pes = &filter->u.pes_filter;
203 pes->pes_cb = pes_cb;
204 pes->opaque = opaque;
208 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
213 if (filter->type == MPEGTS_SECTION)
214 av_freep(&filter->u.section_filter.section_buf);
215 else if (filter->type == MPEGTS_PES)
216 av_freep(&filter->u.pes_filter.opaque);
219 ts->pids[pid] = NULL;
222 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
223 int stat[packet_size];
228 memset(stat, 0, packet_size*sizeof(int));
230 for(x=i=0; i<size; i++){
233 if(stat[x] > best_score){
240 if(x == packet_size) x= 0;
246 /* autodetect fec presence. Must have at least 1024 bytes */
247 static int get_packet_size(const uint8_t *buf, int size)
249 int score, fec_score, dvhs_score;
251 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
254 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
255 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
256 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
257 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
259 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
260 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
261 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
265 typedef struct SectionHeader {
270 uint8_t last_sec_num;
273 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
286 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
292 if ((p + 1) >= p_end)
294 c = (p[0] << 8) | p[1];
300 /* read and allocate a DVB string preceeded by its length */
301 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
308 len = get8(&p, p_end);
311 if ((p + len) > p_end)
313 str = av_malloc(len + 1);
323 static int parse_section_header(SectionHeader *h,
324 const uint8_t **pp, const uint8_t *p_end)
328 val = get8(pp, p_end);
333 val = get16(pp, p_end);
337 val = get8(pp, p_end);
340 h->version = (val >> 1) & 0x1f;
341 val = get8(pp, p_end);
345 val = get8(pp, p_end);
348 h->last_sec_num = val;
352 static MpegTSService *new_service(MpegTSContext *ts, int sid,
353 char *provider_name, char *name)
355 MpegTSService *service;
358 printf("new_service: sid=0x%04x provider='%s' name='%s'\n",
359 sid, provider_name, name);
362 service = av_mallocz(sizeof(MpegTSService));
366 service->provider_name = provider_name;
367 service->name = name;
368 dynarray_add(&ts->services, &ts->nb_services, service);
372 static void pmt_cb(void *opaque, const uint8_t *section, int section_len)
374 MpegTSContext *ts = opaque;
375 SectionHeader h1, *h = &h1;
378 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
379 int program_info_length, pcr_pid, pid, stream_type;
380 int desc_list_len, desc_len, desc_tag;
381 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
386 av_hex_dump(stdout, (uint8_t *)section, section_len);
388 p_end = section + section_len - 4;
390 if (parse_section_header(h, &p, p_end) < 0)
393 printf("sid=0x%x sec_num=%d/%d\n", h->id, h->sec_num, h->last_sec_num);
395 if (h->tid != PMT_TID || (ts->req_sid >= 0 && h->id != ts->req_sid) )
398 pcr_pid = get16(&p, p_end) & 0x1fff;
401 ts->pcr_pid = pcr_pid;
403 printf("pcr_pid=0x%x\n", pcr_pid);
405 program_info_length = get16(&p, p_end) & 0xfff;
406 if (program_info_length < 0)
408 p += program_info_length;
414 stream_type = get8(&p, p_end);
417 pid = get16(&p, p_end) & 0x1fff;
420 desc_list_len = get16(&p, p_end) & 0xfff;
421 if (desc_list_len < 0)
423 desc_list_end = p + desc_list_len;
424 if (desc_list_end > p_end)
427 desc_tag = get8(&p, desc_list_end);
430 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
431 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
432 /*assume DVB AC-3 Audio*/
433 stream_type = STREAM_TYPE_AUDIO_AC3;
434 } else if(desc_tag == 0x7B) {
436 stream_type = STREAM_TYPE_AUDIO_DTS;
439 desc_len = get8(&p, desc_list_end);
440 desc_end = p + desc_len;
441 if (desc_end > desc_list_end)
444 printf("tag: 0x%02x len=%d\n", desc_tag, desc_len);
447 case DVB_SUBT_DESCID:
448 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
449 stream_type = STREAM_TYPE_SUBTITLE_DVB;
451 language[0] = get8(&p, desc_end);
452 language[1] = get8(&p, desc_end);
453 language[2] = get8(&p, desc_end);
456 comp_page = get16(&p, desc_end);
457 anc_page = get16(&p, desc_end);
460 case 0x0a: /* ISO 639 language descriptor */
461 language[0] = get8(&p, desc_end);
462 language[1] = get8(&p, desc_end);
463 language[2] = get8(&p, desc_end);
474 printf("stream_type=%d pid=0x%x\n", stream_type, pid);
477 /* now create ffmpeg stream */
478 switch(stream_type) {
479 case STREAM_TYPE_AUDIO_MPEG1:
480 case STREAM_TYPE_AUDIO_MPEG2:
481 case STREAM_TYPE_VIDEO_MPEG1:
482 case STREAM_TYPE_VIDEO_MPEG2:
483 case STREAM_TYPE_VIDEO_MPEG4:
484 case STREAM_TYPE_VIDEO_H264:
485 case STREAM_TYPE_AUDIO_AAC:
486 case STREAM_TYPE_AUDIO_AC3:
487 case STREAM_TYPE_AUDIO_DTS:
488 case STREAM_TYPE_SUBTITLE_DVB:
489 pes = add_pes_stream(ts, pid, stream_type);
491 st = new_pes_av_stream(pes, 0);
494 /* we ignore the other streams */
499 if (language[0] != 0) {
500 st->language[0] = language[0];
501 st->language[1] = language[1];
502 st->language[2] = language[2];
503 st->language[3] = language[3];
506 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
507 st->codec->sub_id = (anc_page << 16) | comp_page;
511 /* all parameters are there */
512 ts->set_service_cb(ts->set_service_opaque, 0);
513 mpegts_close_filter(ts, ts->pmt_filter);
514 ts->pmt_filter = NULL;
517 static void pat_cb(void *opaque, const uint8_t *section, int section_len)
519 MpegTSContext *ts = opaque;
520 SectionHeader h1, *h = &h1;
521 const uint8_t *p, *p_end;
526 av_hex_dump(stdout, (uint8_t *)section, section_len);
528 p_end = section + section_len - 4;
530 if (parse_section_header(h, &p, p_end) < 0)
532 if (h->tid != PAT_TID)
536 sid = get16(&p, p_end);
539 pmt_pid = get16(&p, p_end) & 0x1fff;
543 printf("sid=0x%x pid=0x%x\n", sid, pmt_pid);
548 if (ts->req_sid == sid) {
549 ts->pmt_filter = mpegts_open_section_filter(ts, pmt_pid,
556 ts->set_service_cb(ts->set_service_opaque, -1);
559 mpegts_close_filter(ts, ts->pat_filter);
560 ts->pat_filter = NULL;
563 /* add all services found in the PAT */
564 static void pat_scan_cb(void *opaque, const uint8_t *section, int section_len)
566 MpegTSContext *ts = opaque;
567 SectionHeader h1, *h = &h1;
568 const uint8_t *p, *p_end;
570 char *provider_name, *name;
575 av_hex_dump(stdout, (uint8_t *)section, section_len);
577 p_end = section + section_len - 4;
579 if (parse_section_header(h, &p, p_end) < 0)
581 if (h->tid != PAT_TID)
585 sid = get16(&p, p_end);
588 pmt_pid = get16(&p, p_end) & 0x1fff;
592 printf("sid=0x%x pid=0x%x\n", sid, pmt_pid);
597 /* add the service with a dummy name */
598 snprintf(buf, sizeof(buf), "Service %x\n", sid);
599 name = av_strdup(buf);
600 provider_name = av_strdup("");
601 if (name && provider_name) {
602 new_service(ts, sid, provider_name, name);
605 av_freep(&provider_name);
612 mpegts_close_filter(ts, ts->pat_filter);
613 ts->pat_filter = NULL;
616 static void mpegts_set_service(MpegTSContext *ts, int sid,
617 SetServiceCallback *set_service_cb, void *opaque)
619 ts->set_service_cb = set_service_cb;
620 ts->set_service_opaque = opaque;
622 ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
626 static void sdt_cb(void *opaque, const uint8_t *section, int section_len)
628 MpegTSContext *ts = opaque;
629 SectionHeader h1, *h = &h1;
630 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
631 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
632 char *name, *provider_name;
636 av_hex_dump(stdout, (uint8_t *)section, section_len);
639 p_end = section + section_len - 4;
641 if (parse_section_header(h, &p, p_end) < 0)
643 if (h->tid != SDT_TID)
645 onid = get16(&p, p_end);
648 val = get8(&p, p_end);
652 sid = get16(&p, p_end);
655 val = get8(&p, p_end);
658 desc_list_len = get16(&p, p_end) & 0xfff;
659 if (desc_list_len < 0)
661 desc_list_end = p + desc_list_len;
662 if (desc_list_end > p_end)
665 desc_tag = get8(&p, desc_list_end);
668 desc_len = get8(&p, desc_list_end);
669 desc_end = p + desc_len;
670 if (desc_end > desc_list_end)
673 printf("tag: 0x%02x len=%d\n", desc_tag, desc_len);
677 service_type = get8(&p, p_end);
678 if (service_type < 0)
680 provider_name = getstr8(&p, p_end);
683 name = getstr8(&p, p_end);
686 new_service(ts, sid, provider_name, name);
698 mpegts_close_filter(ts, ts->sdt_filter);
699 ts->sdt_filter = NULL;
702 /* scan services in a transport stream by looking at the SDT */
703 static void mpegts_scan_sdt(MpegTSContext *ts)
705 ts->sdt_filter = mpegts_open_section_filter(ts, SDT_PID,
709 /* scan services in a transport stream by looking at the PAT (better
711 static void mpegts_scan_pat(MpegTSContext *ts)
713 ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
717 /* TS stream handling */
721 MPEGTS_PESHEADER_FILL,
726 /* enough for PES header + length */
727 #define PES_START_SIZE 9
728 #define MAX_PES_HEADER_SIZE (9 + 255)
734 AVFormatContext *stream;
736 enum MpegTSState state;
737 /* used to get the format */
742 uint8_t header[MAX_PES_HEADER_SIZE];
745 static int64_t get_pts(const uint8_t *p)
750 pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
751 val = (p[1] << 8) | p[2];
752 pts |= (int64_t)(val >> 1) << 15;
753 val = (p[3] << 8) | p[4];
754 pts |= (int64_t)(val >> 1);
758 /* return non zero if a packet could be constructed */
759 static void mpegts_push_data(void *opaque,
760 const uint8_t *buf, int buf_size, int is_start)
762 PESContext *pes = opaque;
763 MpegTSContext *ts = pes->ts;
768 pes->state = MPEGTS_HEADER;
772 while (buf_size > 0) {
775 len = PES_START_SIZE - pes->data_index;
778 memcpy(pes->header + pes->data_index, p, len);
779 pes->data_index += len;
782 if (pes->data_index == PES_START_SIZE) {
783 /* we got all the PES or section header. We can now
786 av_hex_dump(pes->header, pes->data_index);
788 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
789 pes->header[2] == 0x01) {
790 /* it must be an mpeg2 PES stream */
791 code = pes->header[3] | 0x100;
792 if (!((code >= 0x1c0 && code <= 0x1df) ||
793 (code >= 0x1e0 && code <= 0x1ef) ||
797 /* allocate stream */
798 new_pes_av_stream(pes, code);
800 pes->state = MPEGTS_PESHEADER_FILL;
801 pes->total_size = (pes->header[4] << 8) | pes->header[5];
802 /* NOTE: a zero total size means the PES size is
805 pes->total_size += 6;
806 pes->pes_header_size = pes->header[8] + 9;
808 /* otherwise, it should be a table */
811 pes->state = MPEGTS_SKIP;
816 /**********************************************/
817 /* PES packing parsing */
818 case MPEGTS_PESHEADER_FILL:
819 len = pes->pes_header_size - pes->data_index;
822 memcpy(pes->header + pes->data_index, p, len);
823 pes->data_index += len;
826 if (pes->data_index == pes->pes_header_size) {
830 flags = pes->header[7];
832 pes->pts = AV_NOPTS_VALUE;
833 pes->dts = AV_NOPTS_VALUE;
834 if ((flags & 0xc0) == 0x80) {
835 pes->pts = get_pts(r);
837 } else if ((flags & 0xc0) == 0xc0) {
838 pes->pts = get_pts(r);
840 pes->dts = get_pts(r);
843 /* we got the full header. We parse it and get the payload */
844 pes->state = MPEGTS_PAYLOAD;
848 if (pes->total_size) {
849 len = pes->total_size - pes->data_index;
856 AVPacket *pkt = ts->pkt;
857 if (pes->st && av_new_packet(pkt, len) == 0) {
858 memcpy(pkt->data, p, len);
859 pkt->stream_index = pes->st->index;
862 /* reset pts values */
863 pes->pts = AV_NOPTS_VALUE;
864 pes->dts = AV_NOPTS_VALUE;
878 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
881 int codec_type, codec_id;
883 switch(pes->stream_type){
884 case STREAM_TYPE_AUDIO_MPEG1:
885 case STREAM_TYPE_AUDIO_MPEG2:
886 codec_type = CODEC_TYPE_AUDIO;
887 codec_id = CODEC_ID_MP3;
889 case STREAM_TYPE_VIDEO_MPEG1:
890 case STREAM_TYPE_VIDEO_MPEG2:
891 codec_type = CODEC_TYPE_VIDEO;
892 codec_id = CODEC_ID_MPEG2VIDEO;
894 case STREAM_TYPE_VIDEO_MPEG4:
895 codec_type = CODEC_TYPE_VIDEO;
896 codec_id = CODEC_ID_MPEG4;
898 case STREAM_TYPE_VIDEO_H264:
899 codec_type = CODEC_TYPE_VIDEO;
900 codec_id = CODEC_ID_H264;
902 case STREAM_TYPE_AUDIO_AAC:
903 codec_type = CODEC_TYPE_AUDIO;
904 codec_id = CODEC_ID_AAC;
906 case STREAM_TYPE_AUDIO_AC3:
907 codec_type = CODEC_TYPE_AUDIO;
908 codec_id = CODEC_ID_AC3;
910 case STREAM_TYPE_AUDIO_DTS:
911 codec_type = CODEC_TYPE_AUDIO;
912 codec_id = CODEC_ID_DTS;
914 case STREAM_TYPE_SUBTITLE_DVB:
915 codec_type = CODEC_TYPE_SUBTITLE;
916 codec_id = CODEC_ID_DVB_SUBTITLE;
919 if (code >= 0x1c0 && code <= 0x1df) {
920 codec_type = CODEC_TYPE_AUDIO;
921 codec_id = CODEC_ID_MP2;
922 } else if (code == 0x1bd) {
923 codec_type = CODEC_TYPE_AUDIO;
924 codec_id = CODEC_ID_AC3;
926 codec_type = CODEC_TYPE_VIDEO;
927 codec_id = CODEC_ID_MPEG1VIDEO;
931 st = av_new_stream(pes->stream, pes->pid);
933 av_set_pts_info(st, 33, 1, 90000);
935 st->codec->codec_type = codec_type;
936 st->codec->codec_id = codec_id;
937 st->need_parsing = 1;
944 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int stream_type)
949 /* if no pid found, then add a pid context */
950 pes = av_mallocz(sizeof(PESContext));
954 pes->stream = ts->stream;
956 pes->stream_type = stream_type;
957 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
965 /* handle one TS packet */
966 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
968 AVFormatContext *s = ts->stream;
970 int len, pid, cc, cc_ok, afc, is_start;
971 const uint8_t *p, *p_end;
973 pid = ((packet[1] & 0x1f) << 8) | packet[2];
974 is_start = packet[1] & 0x40;
976 if (ts->auto_guess && tss == NULL && is_start) {
977 add_pes_stream(ts, pid, 0);
983 /* continuity check (currently not used) */
984 cc = (packet[3] & 0xf);
985 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
988 /* skip adaptation field */
989 afc = (packet[3] >> 4) & 3;
991 if (afc == 0) /* reserved value */
993 if (afc == 2) /* adaptation field only */
996 /* skip adapation field */
999 /* if past the end of packet, ignore */
1000 p_end = packet + TS_PACKET_SIZE;
1004 if (tss->type == MPEGTS_SECTION) {
1006 /* pointer field present */
1008 if (p + len > p_end)
1011 /* write remaining section bytes */
1012 write_section_data(s, tss,
1014 /* check whether filter has been closed */
1020 write_section_data(s, tss,
1025 write_section_data(s, tss,
1030 tss->u.pes_filter.pes_cb(tss->u.pes_filter.opaque,
1031 p, p_end - p, is_start);
1035 /* XXX: try to find a better synchro over several packets (use
1036 get_packet_size() ?) */
1037 static int mpegts_resync(ByteIOContext *pb)
1041 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1046 url_fseek(pb, -1, SEEK_CUR);
1054 /* return -1 if error or EOF. Return 0 if OK. */
1055 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1060 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1061 if (len != TS_PACKET_SIZE)
1063 /* check paquet sync byte */
1064 if (buf[0] != 0x47) {
1065 /* find a new packet start */
1066 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1067 if (mpegts_resync(pb) < 0)
1068 return AVERROR_INVALIDDATA;
1072 skip = raw_packet_size - TS_PACKET_SIZE;
1074 url_fskip(pb, skip);
1081 static int handle_packets(MpegTSContext *ts, int nb_packets)
1083 AVFormatContext *s = ts->stream;
1084 ByteIOContext *pb = &s->pb;
1085 uint8_t packet[TS_PACKET_SIZE];
1086 int packet_num, ret;
1094 if (nb_packets != 0 && packet_num >= nb_packets)
1096 ret = read_packet(pb, packet, ts->raw_packet_size);
1099 handle_packet(ts, packet);
1104 static int mpegts_probe(AVProbeData *p)
1107 const int size= p->buf_size;
1108 int score, fec_score, dvhs_score;
1109 #define CHECK_COUNT 10
1111 if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))
1114 score = analyze(p->buf, TS_PACKET_SIZE *CHECK_COUNT, TS_PACKET_SIZE, NULL);
1115 dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);
1116 fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);
1117 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1119 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1120 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1121 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1122 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1125 /* only use the extension for safer guess */
1126 if (match_ext(p->filename, "ts"))
1127 return AVPROBE_SCORE_MAX;
1133 void set_service_cb(void *opaque, int ret)
1135 MpegTSContext *ts = opaque;
1136 ts->set_service_ret = ret;
1140 /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return
1141 (-1) if not available */
1142 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1143 const uint8_t *packet)
1145 int afc, len, flags;
1149 afc = (packet[3] >> 4) & 3;
1159 if (!(flags & 0x10))
1163 v = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
1164 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1165 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1169 static int mpegts_read_header(AVFormatContext *s,
1170 AVFormatParameters *ap)
1172 MpegTSContext *ts = s->priv_data;
1173 ByteIOContext *pb = &s->pb;
1177 MpegTSService *service;
1180 ts->mpeg2ts_raw = ap->mpeg2ts_raw;
1181 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1184 /* read the first 1024 bytes to get packet size */
1185 pos = url_ftell(pb);
1186 len = get_buffer(pb, buf, sizeof(buf));
1187 if (len != sizeof(buf))
1189 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1190 if (ts->raw_packet_size <= 0)
1196 if (!ts->mpeg2ts_raw) {
1199 if (!ts->auto_guess) {
1200 ts->set_service_ret = -1;
1202 /* first do a scaning to get all the services */
1203 url_fseek(pb, pos, SEEK_SET);
1204 mpegts_scan_sdt(ts);
1206 handle_packets(ts, s->probesize);
1208 if (ts->nb_services <= 0) {
1209 /* no SDT found, we try to look at the PAT */
1211 /* First remove the SDT filters from each PID */
1213 for (i=0; i < NB_PID_MAX; i++) {
1215 mpegts_close_filter(ts, ts->pids[i]);
1217 url_fseek(pb, pos, SEEK_SET);
1218 mpegts_scan_pat(ts);
1220 handle_packets(ts, s->probesize);
1223 if (ts->nb_services <= 0) {
1224 /* raw transport stream */
1226 s->ctx_flags |= AVFMTCTX_NOHEADER;
1230 /* tune to first service found */
1231 for(i=0; i<ts->nb_services && ts->set_service_ret; i++){
1232 service = ts->services[i];
1235 printf("tuning to '%s'\n", service->name);
1238 /* now find the info for the first service if we found any,
1239 otherwise try to filter all PATs */
1241 url_fseek(pb, pos, SEEK_SET);
1242 mpegts_set_service(ts, sid, set_service_cb, ts);
1244 handle_packets(ts, s->probesize);
1246 /* if could not find service, exit */
1248 if (ts->set_service_ret != 0) {
1252 //let's retry with auto_guess set
1254 goto goto_auto_guess;
1259 printf("tuning done\n");
1262 s->ctx_flags |= AVFMTCTX_NOHEADER;
1265 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1266 int64_t pcrs[2], pcr_h;
1267 int packet_count[2];
1268 uint8_t packet[TS_PACKET_SIZE];
1270 /* only read packets */
1273 st = av_new_stream(s, 0);
1276 av_set_pts_info(st, 60, 1, 27000000);
1277 st->codec->codec_type = CODEC_TYPE_DATA;
1278 st->codec->codec_id = CODEC_ID_MPEG2TS;
1280 /* we iterate until we find two PCRs to estimate the bitrate */
1285 ret = read_packet(&s->pb, packet, ts->raw_packet_size);
1288 pid = ((packet[1] & 0x1f) << 8) | packet[2];
1289 if ((pcr_pid == -1 || pcr_pid == pid) &&
1290 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1292 packet_count[nb_pcrs] = nb_packets;
1293 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1300 ts->pcr_pid = pcr_pid;
1302 /* NOTE1: the bitrate is computed without the FEC */
1303 /* NOTE2: it is only the bitrate of the start of the stream */
1304 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1305 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1306 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1307 st->codec->bit_rate = s->bit_rate;
1308 st->start_time = ts->cur_pcr;
1310 printf("start=%0.3f pcr=%0.3f incr=%d\n",
1311 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1315 url_fseek(pb, pos, SEEK_SET);
1321 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1323 static int mpegts_raw_read_packet(AVFormatContext *s,
1326 MpegTSContext *ts = s->priv_data;
1328 int64_t pcr_h, next_pcr_h, pos;
1329 int pcr_l, next_pcr_l;
1330 uint8_t pcr_buf[12];
1332 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1334 pkt->pos= url_ftell(&s->pb);
1335 ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size);
1337 av_free_packet(pkt);
1340 if (ts->mpeg2ts_compute_pcr) {
1341 /* compute exact PCR for each packet */
1342 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1343 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1344 pos = url_ftell(&s->pb);
1345 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1346 url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1347 get_buffer(&s->pb, pcr_buf, 12);
1348 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1349 /* XXX: not precise enough */
1350 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1355 url_fseek(&s->pb, pos, SEEK_SET);
1356 /* no next PCR found: we use previous increment */
1357 ts->cur_pcr = pcr_h * 300 + pcr_l;
1359 pkt->pts = ts->cur_pcr;
1360 pkt->duration = ts->pcr_incr;
1361 ts->cur_pcr += ts->pcr_incr;
1363 pkt->stream_index = 0;
1367 static int mpegts_read_packet(AVFormatContext *s,
1370 MpegTSContext *ts = s->priv_data;
1372 if (!ts->mpeg2ts_raw) {
1374 return handle_packets(ts, 0);
1376 return mpegts_raw_read_packet(s, pkt);
1380 static int mpegts_read_close(AVFormatContext *s)
1382 MpegTSContext *ts = s->priv_data;
1384 for(i=0;i<NB_PID_MAX;i++)
1385 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1387 for(i = 0; i < ts->nb_services; i++){
1388 av_free(ts->services[i]->provider_name);
1389 av_free(ts->services[i]->name);
1390 av_free(ts->services[i]);
1392 av_freep(&ts->services);
1397 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1398 int64_t *ppos, int64_t pos_limit)
1400 MpegTSContext *ts = s->priv_data;
1401 int64_t pos, timestamp;
1402 uint8_t buf[TS_PACKET_SIZE];
1404 const int find_next= 1;
1405 pos = ((*ppos + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size;
1408 url_fseek(&s->pb, pos, SEEK_SET);
1409 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1410 return AV_NOPTS_VALUE;
1411 pid = ((buf[1] & 0x1f) << 8) | buf[2];
1412 if (pid == ts->pcr_pid &&
1413 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1416 pos += ts->raw_packet_size;
1420 pos -= ts->raw_packet_size;
1422 return AV_NOPTS_VALUE;
1423 url_fseek(&s->pb, pos, SEEK_SET);
1424 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1425 return AV_NOPTS_VALUE;
1426 pid = ((buf[1] & 0x1f) << 8) | buf[2];
1427 if (pid == ts->pcr_pid &&
1428 parse_pcr(×tamp, &pcr_l, buf) == 0) {
1438 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1439 MpegTSContext *ts = s->priv_data;
1440 uint8_t buf[TS_PACKET_SIZE];
1443 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1446 pos= url_ftell(&s->pb);
1449 url_fseek(&s->pb, pos, SEEK_SET);
1450 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1452 // pid = ((buf[1] & 0x1f) << 8) | buf[2];
1453 if(buf[1] & 0x40) break;
1454 pos += ts->raw_packet_size;
1456 url_fseek(&s->pb, pos, SEEK_SET);
1461 /**************************************************************/
1462 /* parsing functions - called from other demuxers such as RTP */
1464 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1468 ts = av_mallocz(sizeof(MpegTSContext));
1471 /* no stream case, currently used by RTP */
1472 ts->raw_packet_size = TS_PACKET_SIZE;
1478 /* return the consumed length if a packet was output, or -1 if no
1480 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1481 const uint8_t *buf, int len)
1491 if (len < TS_PACKET_SIZE)
1493 if (buf[0] != 0x47) {
1497 handle_packet(ts, buf);
1498 buf += TS_PACKET_SIZE;
1499 len -= TS_PACKET_SIZE;
1505 void mpegts_parse_close(MpegTSContext *ts)
1509 for(i=0;i<NB_PID_MAX;i++)
1510 av_free(ts->pids[i]);
1514 AVInputFormat mpegts_demuxer = {
1516 "MPEG2 transport stream format",
1517 sizeof(MpegTSContext),
1524 .flags = AVFMT_SHOW_IDS,