2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 //#define USE_SYNCPOINT_SEARCH
26 #include "libavutil/crc.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavcodec/bytestream.h"
34 /* 1.0 second at 24Mbit/s */
35 #define MAX_SCAN_PACKETS 32000
37 /* maximum size in which we look for synchronisation if
38 synchronisation is lost */
39 #define MAX_RESYNC_SIZE 65536
41 #define MAX_PES_PAYLOAD 200*1024
43 typedef struct PESContext PESContext
;
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 AVStream
*sub_st
; /**< stream for the embedded AC3 stream in HDMV TrueHD */
150 enum MpegTSState state
;
151 /* used to get the format */
155 int extended_stream_id
;
157 int64_t ts_packet_pos
; /**< position of first TS packet of this PES packet */
158 uint8_t header
[MAX_PES_HEADER_SIZE
];
162 extern AVInputFormat mpegts_demuxer
;
164 static void clear_program(MpegTSContext
*ts
, unsigned int programid
)
168 for(i
=0; i
<ts
->nb_prg
; i
++)
169 if(ts
->prg
[i
].id
== programid
)
170 ts
->prg
[i
].nb_pids
= 0;
173 static void clear_programs(MpegTSContext
*ts
)
179 static void add_pat_entry(MpegTSContext
*ts
, unsigned int programid
)
182 void *tmp
= av_realloc(ts
->prg
, (ts
->nb_prg
+1)*sizeof(struct Program
));
186 p
= &ts
->prg
[ts
->nb_prg
];
192 static void add_pid_to_pmt(MpegTSContext
*ts
, unsigned int programid
, unsigned int pid
)
195 struct Program
*p
= NULL
;
196 for(i
=0; i
<ts
->nb_prg
; i
++) {
197 if(ts
->prg
[i
].id
== programid
) {
205 if(p
->nb_pids
>= MAX_PIDS_PER_PROGRAM
)
207 p
->pids
[p
->nb_pids
++] = pid
;
211 * \brief discard_pid() decides if the pid is to be discarded according
212 * to caller's programs selection
213 * \param ts : - TS context
215 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
218 static int discard_pid(MpegTSContext
*ts
, unsigned int pid
)
221 int used
= 0, discarded
= 0;
223 for(i
=0; i
<ts
->nb_prg
; i
++) {
225 for(j
=0; j
<p
->nb_pids
; j
++) {
226 if(p
->pids
[j
] != pid
)
228 //is program with id p->id set to be discarded?
229 for(k
=0; k
<ts
->stream
->nb_programs
; k
++) {
230 if(ts
->stream
->programs
[k
]->id
== p
->id
) {
231 if(ts
->stream
->programs
[k
]->discard
== AVDISCARD_ALL
)
240 return !used
&& discarded
;
244 * Assembles PES packets out of TS packets, and then calls the "section_cb"
245 * function when they are complete.
247 static void write_section_data(AVFormatContext
*s
, MpegTSFilter
*tss1
,
248 const uint8_t *buf
, int buf_size
, int is_start
)
250 MpegTSSectionFilter
*tss
= &tss1
->u
.section_filter
;
254 memcpy(tss
->section_buf
, buf
, buf_size
);
255 tss
->section_index
= buf_size
;
256 tss
->section_h_size
= -1;
257 tss
->end_of_section_reached
= 0;
259 if (tss
->end_of_section_reached
)
261 len
= 4096 - tss
->section_index
;
264 memcpy(tss
->section_buf
+ tss
->section_index
, buf
, len
);
265 tss
->section_index
+= len
;
268 /* compute section length if possible */
269 if (tss
->section_h_size
== -1 && tss
->section_index
>= 3) {
270 len
= (AV_RB16(tss
->section_buf
+ 1) & 0xfff) + 3;
273 tss
->section_h_size
= len
;
276 if (tss
->section_h_size
!= -1 && tss
->section_index
>= tss
->section_h_size
) {
277 tss
->end_of_section_reached
= 1;
278 if (!tss
->check_crc
||
279 av_crc(av_crc_get_table(AV_CRC_32_IEEE
), -1,
280 tss
->section_buf
, tss
->section_h_size
) == 0)
281 tss
->section_cb(tss1
, tss
->section_buf
, tss
->section_h_size
);
285 static MpegTSFilter
*mpegts_open_section_filter(MpegTSContext
*ts
, unsigned int pid
,
286 SectionCallback
*section_cb
, void *opaque
,
290 MpegTSFilter
*filter
;
291 MpegTSSectionFilter
*sec
;
293 dprintf(ts
->stream
, "Filter: pid=0x%x\n", pid
);
295 if (pid
>= NB_PID_MAX
|| ts
->pids
[pid
])
297 filter
= av_mallocz(sizeof(MpegTSFilter
));
300 ts
->pids
[pid
] = filter
;
301 filter
->type
= MPEGTS_SECTION
;
303 filter
->last_cc
= -1;
304 sec
= &filter
->u
.section_filter
;
305 sec
->section_cb
= section_cb
;
306 sec
->opaque
= opaque
;
307 sec
->section_buf
= av_malloc(MAX_SECTION_SIZE
);
308 sec
->check_crc
= check_crc
;
309 if (!sec
->section_buf
) {
316 static MpegTSFilter
*mpegts_open_pes_filter(MpegTSContext
*ts
, unsigned int pid
,
320 MpegTSFilter
*filter
;
321 MpegTSPESFilter
*pes
;
323 if (pid
>= NB_PID_MAX
|| ts
->pids
[pid
])
325 filter
= av_mallocz(sizeof(MpegTSFilter
));
328 ts
->pids
[pid
] = filter
;
329 filter
->type
= MPEGTS_PES
;
331 filter
->last_cc
= -1;
332 pes
= &filter
->u
.pes_filter
;
333 pes
->pes_cb
= pes_cb
;
334 pes
->opaque
= opaque
;
338 static void mpegts_close_filter(MpegTSContext
*ts
, MpegTSFilter
*filter
)
343 if (filter
->type
== MPEGTS_SECTION
)
344 av_freep(&filter
->u
.section_filter
.section_buf
);
345 else if (filter
->type
== MPEGTS_PES
) {
346 PESContext
*pes
= filter
->u
.pes_filter
.opaque
;
347 av_freep(&pes
->buffer
);
348 /* referenced private data will be freed later in
349 * av_close_input_stream */
350 if (!((PESContext
*)filter
->u
.pes_filter
.opaque
)->st
) {
351 av_freep(&filter
->u
.pes_filter
.opaque
);
356 ts
->pids
[pid
] = NULL
;
359 static int analyze(const uint8_t *buf
, int size
, int packet_size
, int *index
){
360 int stat
[TS_MAX_PACKET_SIZE
];
365 memset(stat
, 0, packet_size
*sizeof(int));
367 for(x
=i
=0; i
<size
-3; i
++){
368 if(buf
[i
] == 0x47 && !(buf
[i
+1] & 0x80) && (buf
[i
+3] & 0x30)){
370 if(stat
[x
] > best_score
){
377 if(x
== packet_size
) x
= 0;
383 /* autodetect fec presence. Must have at least 1024 bytes */
384 static int get_packet_size(const uint8_t *buf
, int size
)
386 int score
, fec_score
, dvhs_score
;
388 if (size
< (TS_FEC_PACKET_SIZE
* 5 + 1))
391 score
= analyze(buf
, size
, TS_PACKET_SIZE
, NULL
);
392 dvhs_score
= analyze(buf
, size
, TS_DVHS_PACKET_SIZE
, NULL
);
393 fec_score
= analyze(buf
, size
, TS_FEC_PACKET_SIZE
, NULL
);
394 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
396 if (score
> fec_score
&& score
> dvhs_score
) return TS_PACKET_SIZE
;
397 else if(dvhs_score
> score
&& dvhs_score
> fec_score
) return TS_DVHS_PACKET_SIZE
;
398 else if(score
< fec_score
&& dvhs_score
< fec_score
) return TS_FEC_PACKET_SIZE
;
402 typedef struct SectionHeader
{
407 uint8_t last_sec_num
;
410 static inline int get8(const uint8_t **pp
, const uint8_t *p_end
)
423 static inline int get16(const uint8_t **pp
, const uint8_t *p_end
)
429 if ((p
+ 1) >= p_end
)
437 /* read and allocate a DVB string preceeded by its length */
438 static char *getstr8(const uint8_t **pp
, const uint8_t *p_end
)
445 len
= get8(&p
, p_end
);
448 if ((p
+ len
) > p_end
)
450 str
= av_malloc(len
+ 1);
460 static int parse_section_header(SectionHeader
*h
,
461 const uint8_t **pp
, const uint8_t *p_end
)
465 val
= get8(pp
, p_end
);
470 val
= get16(pp
, p_end
);
474 val
= get8(pp
, p_end
);
477 h
->version
= (val
>> 1) & 0x1f;
478 val
= get8(pp
, p_end
);
482 val
= get8(pp
, p_end
);
485 h
->last_sec_num
= val
;
490 uint32_t stream_type
;
491 enum CodecType codec_type
;
492 enum CodecID codec_id
;
495 static const StreamType ISO_types
[] = {
496 { 0x01, CODEC_TYPE_VIDEO
, CODEC_ID_MPEG2VIDEO
},
497 { 0x02, CODEC_TYPE_VIDEO
, CODEC_ID_MPEG2VIDEO
},
498 { 0x03, CODEC_TYPE_AUDIO
, CODEC_ID_MP3
},
499 { 0x04, CODEC_TYPE_AUDIO
, CODEC_ID_MP3
},
500 { 0x0f, CODEC_TYPE_AUDIO
, CODEC_ID_AAC
},
501 { 0x10, CODEC_TYPE_VIDEO
, CODEC_ID_MPEG4
},
502 { 0x11, CODEC_TYPE_AUDIO
, CODEC_ID_AAC
}, /* LATM syntax */
503 { 0x1b, CODEC_TYPE_VIDEO
, CODEC_ID_H264
},
504 { 0xd1, CODEC_TYPE_VIDEO
, CODEC_ID_DIRAC
},
505 { 0xea, CODEC_TYPE_VIDEO
, CODEC_ID_VC1
},
509 static const StreamType HDMV_types
[] = {
510 { 0x80, CODEC_TYPE_AUDIO
, CODEC_ID_PCM_BLURAY
},
511 { 0x81, CODEC_TYPE_AUDIO
, CODEC_ID_AC3
},
512 { 0x82, CODEC_TYPE_AUDIO
, CODEC_ID_DTS
},
513 { 0x83, CODEC_TYPE_AUDIO
, CODEC_ID_TRUEHD
},
514 { 0x84, CODEC_TYPE_AUDIO
, CODEC_ID_EAC3
},
515 { 0x90, CODEC_TYPE_SUBTITLE
, CODEC_ID_HDMV_PGS_SUBTITLE
},
520 static const StreamType MISC_types
[] = {
521 { 0x81, CODEC_TYPE_AUDIO
, CODEC_ID_AC3
},
522 { 0x8a, CODEC_TYPE_AUDIO
, CODEC_ID_DTS
},
526 static const StreamType REGD_types
[] = {
527 { MKTAG('d','r','a','c'), CODEC_TYPE_VIDEO
, CODEC_ID_DIRAC
},
528 { MKTAG('A','C','-','3'), CODEC_TYPE_AUDIO
, CODEC_ID_AC3
},
532 /* descriptor present */
533 static const StreamType DESC_types
[] = {
534 { 0x6a, CODEC_TYPE_AUDIO
, CODEC_ID_AC3
}, /* AC-3 descriptor */
535 { 0x7a, CODEC_TYPE_AUDIO
, CODEC_ID_EAC3
}, /* E-AC-3 descriptor */
536 { 0x7b, CODEC_TYPE_AUDIO
, CODEC_ID_DTS
},
537 { 0x56, CODEC_TYPE_SUBTITLE
, CODEC_ID_DVB_TELETEXT
},
538 { 0x59, CODEC_TYPE_SUBTITLE
, CODEC_ID_DVB_SUBTITLE
}, /* subtitling descriptor */
542 static void mpegts_find_stream_type(AVStream
*st
,
543 uint32_t stream_type
, const StreamType
*types
)
545 for (; types
->stream_type
; types
++) {
546 if (stream_type
== types
->stream_type
) {
547 st
->codec
->codec_type
= types
->codec_type
;
548 st
->codec
->codec_id
= types
->codec_id
;
554 static int mpegts_set_stream_info(AVStream
*st
, PESContext
*pes
,
555 uint32_t stream_type
, uint32_t prog_reg_desc
)
557 av_set_pts_info(st
, 33, 1, 90000);
559 st
->codec
->codec_type
= CODEC_TYPE_DATA
;
560 st
->codec
->codec_id
= CODEC_ID_NONE
;
561 st
->need_parsing
= AVSTREAM_PARSE_FULL
;
563 pes
->stream_type
= stream_type
;
565 av_log(pes
->stream
, AV_LOG_DEBUG
,
566 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
567 st
->index
, pes
->stream_type
, pes
->pid
, (char*)&prog_reg_desc
);
569 st
->codec
->codec_tag
= pes
->stream_type
;
571 mpegts_find_stream_type(st
, pes
->stream_type
, ISO_types
);
572 if (prog_reg_desc
== AV_RL32("HDMV") &&
573 st
->codec
->codec_id
== CODEC_ID_NONE
) {
574 mpegts_find_stream_type(st
, pes
->stream_type
, HDMV_types
);
575 if (pes
->stream_type
== 0x83) {
576 // HDMV TrueHD streams also contain an AC3 coded version of the
577 // audio track - add a second stream for this
579 // priv_data cannot be shared between streams
580 PESContext
*sub_pes
= av_malloc(sizeof(*sub_pes
));
582 return AVERROR(ENOMEM
);
583 memcpy(sub_pes
, pes
, sizeof(*sub_pes
));
585 sub_st
= av_new_stream(pes
->stream
, pes
->pid
);
588 return AVERROR(ENOMEM
);
591 av_set_pts_info(sub_st
, 33, 1, 90000);
592 sub_st
->priv_data
= sub_pes
;
593 sub_st
->codec
->codec_type
= CODEC_TYPE_AUDIO
;
594 sub_st
->codec
->codec_id
= CODEC_ID_AC3
;
595 sub_st
->need_parsing
= AVSTREAM_PARSE_FULL
;
596 sub_pes
->sub_st
= pes
->sub_st
= sub_st
;
599 if (st
->codec
->codec_id
== CODEC_ID_NONE
)
600 mpegts_find_stream_type(st
, pes
->stream_type
, MISC_types
);
605 static int64_t get_pts(const uint8_t *p
)
607 int64_t pts
= (int64_t)((p
[0] >> 1) & 0x07) << 30;
608 pts
|= (AV_RB16(p
+ 1) >> 1) << 15;
609 pts
|= AV_RB16(p
+ 3) >> 1;
613 static void new_pes_packet(PESContext
*pes
, AVPacket
*pkt
)
617 pkt
->destruct
= av_destruct_packet
;
618 pkt
->data
= pes
->buffer
;
619 pkt
->size
= pes
->data_index
;
620 memset(pkt
->data
+pkt
->size
, 0, FF_INPUT_BUFFER_PADDING_SIZE
);
622 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
623 if (pes
->sub_st
&& pes
->stream_type
== 0x83 && pes
->extended_stream_id
== 0x76)
624 pkt
->stream_index
= pes
->sub_st
->index
;
626 pkt
->stream_index
= pes
->st
->index
;
629 /* store position of first TS packet of this PES packet */
630 pkt
->pos
= pes
->ts_packet_pos
;
632 /* reset pts values */
633 pes
->pts
= AV_NOPTS_VALUE
;
634 pes
->dts
= AV_NOPTS_VALUE
;
639 /* return non zero if a packet could be constructed */
640 static int mpegts_push_data(MpegTSFilter
*filter
,
641 const uint8_t *buf
, int buf_size
, int is_start
,
644 PESContext
*pes
= filter
->u
.pes_filter
.opaque
;
645 MpegTSContext
*ts
= pes
->ts
;
653 if (pes
->state
== MPEGTS_PAYLOAD
&& pes
->data_index
> 0) {
654 new_pes_packet(pes
, ts
->pkt
);
657 pes
->state
= MPEGTS_HEADER
;
659 pes
->ts_packet_pos
= pos
;
662 while (buf_size
> 0) {
665 len
= PES_START_SIZE
- pes
->data_index
;
668 memcpy(pes
->header
+ pes
->data_index
, p
, len
);
669 pes
->data_index
+= len
;
672 if (pes
->data_index
== PES_START_SIZE
) {
673 /* we got all the PES or section header. We can now
676 av_hex_dump_log(pes
->stream
, AV_LOG_DEBUG
, pes
->header
, pes
->data_index
);
678 if (pes
->header
[0] == 0x00 && pes
->header
[1] == 0x00 &&
679 pes
->header
[2] == 0x01) {
680 /* it must be an mpeg2 PES stream */
681 code
= pes
->header
[3] | 0x100;
682 dprintf(pes
->stream
, "pid=%x pes_code=%#x\n", pes
->pid
, code
);
684 if ((!pes
->st
&& pes
->stream
->nb_streams
== MAX_STREAMS
) ||
685 (pes
->st
&& pes
->st
->discard
== AVDISCARD_ALL
) ||
686 code
== 0x1be) /* padding_stream */
689 /* stream not present in PMT */
691 pes
->st
= av_new_stream(ts
->stream
, pes
->pid
);
693 return AVERROR(ENOMEM
);
694 mpegts_set_stream_info(pes
->st
, pes
, 0, 0);
697 pes
->total_size
= AV_RB16(pes
->header
+ 4);
698 /* NOTE: a zero total size means the PES size is
700 if (!pes
->total_size
)
701 pes
->total_size
= MAX_PES_PAYLOAD
;
703 /* allocate pes buffer */
704 pes
->buffer
= av_malloc(pes
->total_size
+FF_INPUT_BUFFER_PADDING_SIZE
);
706 return AVERROR(ENOMEM
);
708 if (code
!= 0x1bc && code
!= 0x1bf && /* program_stream_map, private_stream_2 */
709 code
!= 0x1f0 && code
!= 0x1f1 && /* ECM, EMM */
710 code
!= 0x1ff && code
!= 0x1f2 && /* program_stream_directory, DSMCC_stream */
711 code
!= 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
712 pes
->state
= MPEGTS_PESHEADER
;
713 if (pes
->st
->codec
->codec_id
== CODEC_ID_NONE
) {
714 dprintf(pes
->stream
, "pid=%x stream_type=%x probing\n",
715 pes
->pid
, pes
->stream_type
);
716 pes
->st
->codec
->codec_id
= CODEC_ID_PROBE
;
719 pes
->state
= MPEGTS_PAYLOAD
;
723 /* otherwise, it should be a table */
726 pes
->state
= MPEGTS_SKIP
;
731 /**********************************************/
732 /* PES packing parsing */
733 case MPEGTS_PESHEADER
:
734 len
= PES_HEADER_SIZE
- pes
->data_index
;
739 memcpy(pes
->header
+ pes
->data_index
, p
, len
);
740 pes
->data_index
+= len
;
743 if (pes
->data_index
== PES_HEADER_SIZE
) {
744 pes
->pes_header_size
= pes
->header
[8] + 9;
745 pes
->state
= MPEGTS_PESHEADER_FILL
;
748 case MPEGTS_PESHEADER_FILL
:
749 len
= pes
->pes_header_size
- pes
->data_index
;
754 memcpy(pes
->header
+ pes
->data_index
, p
, len
);
755 pes
->data_index
+= len
;
758 if (pes
->data_index
== pes
->pes_header_size
) {
760 unsigned int flags
, pes_ext
, skip
;
762 flags
= pes
->header
[7];
764 pes
->pts
= AV_NOPTS_VALUE
;
765 pes
->dts
= AV_NOPTS_VALUE
;
766 if ((flags
& 0xc0) == 0x80) {
767 pes
->dts
= pes
->pts
= get_pts(r
);
769 } else if ((flags
& 0xc0) == 0xc0) {
770 pes
->pts
= get_pts(r
);
772 pes
->dts
= get_pts(r
);
775 pes
->extended_stream_id
= -1;
776 if (flags
& 0x01) { /* PES extension */
778 /* Skip PES private data, program packet sequence counter and P-STD buffer */
779 skip
= (pes_ext
>> 4) & 0xb;
782 if ((pes_ext
& 0x41) == 0x01 &&
783 (r
+ 2) <= (pes
->header
+ pes
->pes_header_size
)) {
784 /* PES extension 2 */
785 if ((r
[0] & 0x7f) > 0 && (r
[1] & 0x80) == 0)
786 pes
->extended_stream_id
= r
[1];
790 /* we got the full header. We parse it and get the payload */
791 pes
->state
= MPEGTS_PAYLOAD
;
796 if (buf_size
> 0 && pes
->buffer
) {
797 if (pes
->data_index
+buf_size
> pes
->total_size
) {
798 new_pes_packet(pes
, ts
->pkt
);
799 pes
->total_size
= MAX_PES_PAYLOAD
;
800 pes
->buffer
= av_malloc(pes
->total_size
+FF_INPUT_BUFFER_PADDING_SIZE
);
802 return AVERROR(ENOMEM
);
805 memcpy(pes
->buffer
+pes
->data_index
, p
, buf_size
);
806 pes
->data_index
+= buf_size
;
819 static PESContext
*add_pes_stream(MpegTSContext
*ts
, int pid
, int pcr_pid
)
824 /* if no pid found, then add a pid context */
825 pes
= av_mallocz(sizeof(PESContext
));
829 pes
->stream
= ts
->stream
;
831 pes
->pcr_pid
= pcr_pid
;
832 pes
->state
= MPEGTS_SKIP
;
833 pes
->pts
= AV_NOPTS_VALUE
;
834 pes
->dts
= AV_NOPTS_VALUE
;
835 tss
= mpegts_open_pes_filter(ts
, pid
, mpegts_push_data
, pes
);
843 static void pmt_cb(MpegTSFilter
*filter
, const uint8_t *section
, int section_len
)
845 MpegTSContext
*ts
= filter
->u
.section_filter
.opaque
;
846 SectionHeader h1
, *h
= &h1
;
849 const uint8_t *p
, *p_end
, *desc_list_end
, *desc_end
;
850 int program_info_length
, pcr_pid
, pid
, stream_type
;
851 int desc_list_len
, desc_len
, desc_tag
;
852 int comp_page
, anc_page
;
854 uint32_t prog_reg_desc
= 0; /* registration descriptor */
857 dprintf(ts
->stream
, "PMT: len %i\n", section_len
);
858 av_hex_dump_log(ts
->stream
, AV_LOG_DEBUG
, (uint8_t *)section
, section_len
);
861 p_end
= section
+ section_len
- 4;
863 if (parse_section_header(h
, &p
, p_end
) < 0)
866 dprintf(ts
->stream
, "sid=0x%x sec_num=%d/%d\n",
867 h
->id
, h
->sec_num
, h
->last_sec_num
);
869 if (h
->tid
!= PMT_TID
)
872 clear_program(ts
, h
->id
);
873 pcr_pid
= get16(&p
, p_end
) & 0x1fff;
876 add_pid_to_pmt(ts
, h
->id
, pcr_pid
);
878 dprintf(ts
->stream
, "pcr_pid=0x%x\n", pcr_pid
);
880 program_info_length
= get16(&p
, p_end
) & 0xfff;
881 if (program_info_length
< 0)
883 while(program_info_length
>= 2) {
885 tag
= get8(&p
, p_end
);
886 len
= get8(&p
, p_end
);
887 if(len
> program_info_length
- 2)
888 //something else is broken, exit the program_descriptors_loop
890 program_info_length
-= len
+ 2;
891 if(tag
== 0x05 && len
>= 4) { // registration descriptor
892 prog_reg_desc
= bytestream_get_le32(&p
);
897 p
+= program_info_length
;
901 // stop parsing after pmt, we found header
902 if (!ts
->stream
->nb_streams
)
907 stream_type
= get8(&p
, p_end
);
910 pid
= get16(&p
, p_end
) & 0x1fff;
914 /* now create ffmpeg stream */
915 if (ts
->pids
[pid
] && ts
->pids
[pid
]->type
== MPEGTS_PES
) {
916 pes
= ts
->pids
[pid
]->u
.pes_filter
.opaque
;
919 if (ts
->pids
[pid
]) mpegts_close_filter(ts
, ts
->pids
[pid
]); //wrongly added sdt filter probably
920 pes
= add_pes_stream(ts
, pid
, pcr_pid
);
922 st
= av_new_stream(pes
->stream
, pes
->pid
);
928 if (!pes
->stream_type
)
929 mpegts_set_stream_info(st
, pes
, stream_type
, prog_reg_desc
);
931 add_pid_to_pmt(ts
, h
->id
, pid
);
933 av_program_add_stream_index(ts
->stream
, h
->id
, st
->index
);
935 desc_list_len
= get16(&p
, p_end
) & 0xfff;
936 if (desc_list_len
< 0)
938 desc_list_end
= p
+ desc_list_len
;
939 if (desc_list_end
> p_end
)
942 desc_tag
= get8(&p
, desc_list_end
);
945 desc_len
= get8(&p
, desc_list_end
);
948 desc_end
= p
+ desc_len
;
949 if (desc_end
> desc_list_end
)
952 dprintf(ts
->stream
, "tag: 0x%02x len=%d\n",
955 if (st
->codec
->codec_id
== CODEC_ID_NONE
&&
956 stream_type
== STREAM_TYPE_PRIVATE_DATA
)
957 mpegts_find_stream_type(st
, desc_tag
, DESC_types
);
960 case 0x56: /* DVB teletext descriptor */
961 language
[0] = get8(&p
, desc_end
);
962 language
[1] = get8(&p
, desc_end
);
963 language
[2] = get8(&p
, desc_end
);
965 av_metadata_set(&st
->metadata
, "language", language
);
967 case 0x59: /* subtitling descriptor */
968 language
[0] = get8(&p
, desc_end
);
969 language
[1] = get8(&p
, desc_end
);
970 language
[2] = get8(&p
, desc_end
);
973 comp_page
= get16(&p
, desc_end
);
974 anc_page
= get16(&p
, desc_end
);
975 st
->codec
->sub_id
= (anc_page
<< 16) | comp_page
;
976 av_metadata_set(&st
->metadata
, "language", language
);
978 case 0x0a: /* ISO 639 language descriptor */
979 language
[0] = get8(&p
, desc_end
);
980 language
[1] = get8(&p
, desc_end
);
981 language
[2] = get8(&p
, desc_end
);
983 av_metadata_set(&st
->metadata
, "language", language
);
985 case 0x05: /* registration descriptor */
986 st
->codec
->codec_tag
= bytestream_get_le32(&p
);
987 dprintf(ts
->stream
, "reg_desc=%.4s\n", (char*)&st
->codec
->codec_tag
);
988 if (st
->codec
->codec_id
== CODEC_ID_NONE
&&
989 stream_type
== STREAM_TYPE_PRIVATE_DATA
)
990 mpegts_find_stream_type(st
, st
->codec
->codec_tag
, REGD_types
);
997 if (prog_reg_desc
== AV_RL32("HDMV") && stream_type
== 0x83 && pes
->sub_st
) {
998 av_program_add_stream_index(ts
->stream
, h
->id
, pes
->sub_st
->index
);
999 pes
->sub_st
->codec
->codec_tag
= st
->codec
->codec_tag
;
1004 /* all parameters are there */
1005 mpegts_close_filter(ts
, filter
);
1008 static void pat_cb(MpegTSFilter
*filter
, const uint8_t *section
, int section_len
)
1010 MpegTSContext
*ts
= filter
->u
.section_filter
.opaque
;
1011 SectionHeader h1
, *h
= &h1
;
1012 const uint8_t *p
, *p_end
;
1016 dprintf(ts
->stream
, "PAT:\n");
1017 av_hex_dump_log(ts
->stream
, AV_LOG_DEBUG
, (uint8_t *)section
, section_len
);
1019 p_end
= section
+ section_len
- 4;
1021 if (parse_section_header(h
, &p
, p_end
) < 0)
1023 if (h
->tid
!= PAT_TID
)
1028 sid
= get16(&p
, p_end
);
1031 pmt_pid
= get16(&p
, p_end
) & 0x1fff;
1035 dprintf(ts
->stream
, "sid=0x%x pid=0x%x\n", sid
, pmt_pid
);
1037 if (sid
== 0x0000) {
1040 av_new_program(ts
->stream
, sid
);
1041 mpegts_open_section_filter(ts
, pmt_pid
, pmt_cb
, ts
, 1);
1042 add_pat_entry(ts
, sid
);
1043 add_pid_to_pmt(ts
, sid
, 0); //add pat pid to program
1044 add_pid_to_pmt(ts
, sid
, pmt_pid
);
1049 static void sdt_cb(MpegTSFilter
*filter
, const uint8_t *section
, int section_len
)
1051 MpegTSContext
*ts
= filter
->u
.section_filter
.opaque
;
1052 SectionHeader h1
, *h
= &h1
;
1053 const uint8_t *p
, *p_end
, *desc_list_end
, *desc_end
;
1054 int onid
, val
, sid
, desc_list_len
, desc_tag
, desc_len
, service_type
;
1055 char *name
, *provider_name
;
1058 dprintf(ts
->stream
, "SDT:\n");
1059 av_hex_dump_log(ts
->stream
, AV_LOG_DEBUG
, (uint8_t *)section
, section_len
);
1062 p_end
= section
+ section_len
- 4;
1064 if (parse_section_header(h
, &p
, p_end
) < 0)
1066 if (h
->tid
!= SDT_TID
)
1068 onid
= get16(&p
, p_end
);
1071 val
= get8(&p
, p_end
);
1075 sid
= get16(&p
, p_end
);
1078 val
= get8(&p
, p_end
);
1081 desc_list_len
= get16(&p
, p_end
) & 0xfff;
1082 if (desc_list_len
< 0)
1084 desc_list_end
= p
+ desc_list_len
;
1085 if (desc_list_end
> p_end
)
1088 desc_tag
= get8(&p
, desc_list_end
);
1091 desc_len
= get8(&p
, desc_list_end
);
1092 desc_end
= p
+ desc_len
;
1093 if (desc_end
> desc_list_end
)
1096 dprintf(ts
->stream
, "tag: 0x%02x len=%d\n",
1097 desc_tag
, desc_len
);
1101 service_type
= get8(&p
, p_end
);
1102 if (service_type
< 0)
1104 provider_name
= getstr8(&p
, p_end
);
1107 name
= getstr8(&p
, p_end
);
1109 AVProgram
*program
= av_new_program(ts
->stream
, sid
);
1111 av_metadata_set(&program
->metadata
, "name", name
);
1112 av_metadata_set(&program
->metadata
, "provider_name", provider_name
);
1116 av_free(provider_name
);
1127 /* handle one TS packet */
1128 static int handle_packet(MpegTSContext
*ts
, const uint8_t *packet
)
1130 AVFormatContext
*s
= ts
->stream
;
1132 int len
, pid
, cc
, cc_ok
, afc
, is_start
;
1133 const uint8_t *p
, *p_end
;
1136 pid
= AV_RB16(packet
+ 1) & 0x1fff;
1137 if(pid
&& discard_pid(ts
, pid
))
1139 is_start
= packet
[1] & 0x40;
1140 tss
= ts
->pids
[pid
];
1141 if (ts
->auto_guess
&& tss
== NULL
&& is_start
) {
1142 add_pes_stream(ts
, pid
, -1);
1143 tss
= ts
->pids
[pid
];
1148 /* continuity check (currently not used) */
1149 cc
= (packet
[3] & 0xf);
1150 cc_ok
= (tss
->last_cc
< 0) || ((((tss
->last_cc
+ 1) & 0x0f) == cc
));
1153 /* skip adaptation field */
1154 afc
= (packet
[3] >> 4) & 3;
1156 if (afc
== 0) /* reserved value */
1158 if (afc
== 2) /* adaptation field only */
1161 /* skip adapation field */
1164 /* if past the end of packet, ignore */
1165 p_end
= packet
+ TS_PACKET_SIZE
;
1169 pos
= url_ftell(ts
->stream
->pb
);
1170 ts
->pos47
= pos
% ts
->raw_packet_size
;
1172 if (tss
->type
== MPEGTS_SECTION
) {
1174 /* pointer field present */
1176 if (p
+ len
> p_end
)
1179 /* write remaining section bytes */
1180 write_section_data(s
, tss
,
1182 /* check whether filter has been closed */
1188 write_section_data(s
, tss
,
1193 write_section_data(s
, tss
,
1199 // Note: The position here points actually behind the current packet.
1200 if ((ret
= tss
->u
.pes_filter
.pes_cb(tss
, p
, p_end
- p
, is_start
,
1201 pos
- ts
->raw_packet_size
)) < 0)
1208 /* XXX: try to find a better synchro over several packets (use
1209 get_packet_size() ?) */
1210 static int mpegts_resync(AVFormatContext
*s
)
1212 ByteIOContext
*pb
= s
->pb
;
1215 for(i
= 0;i
< MAX_RESYNC_SIZE
; i
++) {
1220 url_fseek(pb
, -1, SEEK_CUR
);
1224 av_log(s
, AV_LOG_ERROR
, "max resync size reached, could not find sync byte\n");
1229 /* return -1 if error or EOF. Return 0 if OK. */
1230 static int read_packet(AVFormatContext
*s
, uint8_t *buf
, int raw_packet_size
)
1232 ByteIOContext
*pb
= s
->pb
;
1236 len
= get_buffer(pb
, buf
, TS_PACKET_SIZE
);
1237 if (len
!= TS_PACKET_SIZE
)
1238 return AVERROR(EIO
);
1239 /* check paquet sync byte */
1240 if (buf
[0] != 0x47) {
1241 /* find a new packet start */
1242 url_fseek(pb
, -TS_PACKET_SIZE
, SEEK_CUR
);
1243 if (mpegts_resync(s
) < 0)
1244 return AVERROR(EAGAIN
);
1248 skip
= raw_packet_size
- TS_PACKET_SIZE
;
1250 url_fskip(pb
, skip
);
1257 static int handle_packets(MpegTSContext
*ts
, int nb_packets
)
1259 AVFormatContext
*s
= ts
->stream
;
1260 uint8_t packet
[TS_PACKET_SIZE
];
1261 int packet_num
, ret
;
1266 if (ts
->stop_parse
>0)
1269 if (nb_packets
!= 0 && packet_num
>= nb_packets
)
1271 ret
= read_packet(s
, packet
, ts
->raw_packet_size
);
1274 ret
= handle_packet(ts
, packet
);
1281 static int mpegts_probe(AVProbeData
*p
)
1284 const int size
= p
->buf_size
;
1285 int score
, fec_score
, dvhs_score
;
1286 int check_count
= size
/ TS_FEC_PACKET_SIZE
;
1287 #define CHECK_COUNT 10
1289 if (check_count
< CHECK_COUNT
)
1292 score
= analyze(p
->buf
, TS_PACKET_SIZE
*check_count
, TS_PACKET_SIZE
, NULL
)*CHECK_COUNT
/check_count
;
1293 dvhs_score
= analyze(p
->buf
, TS_DVHS_PACKET_SIZE
*check_count
, TS_DVHS_PACKET_SIZE
, NULL
)*CHECK_COUNT
/check_count
;
1294 fec_score
= analyze(p
->buf
, TS_FEC_PACKET_SIZE
*check_count
, TS_FEC_PACKET_SIZE
, NULL
)*CHECK_COUNT
/check_count
;
1295 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1297 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1298 if (score
> fec_score
&& score
> dvhs_score
&& score
> 6) return AVPROBE_SCORE_MAX
+ score
- CHECK_COUNT
;
1299 else if(dvhs_score
> score
&& dvhs_score
> fec_score
&& dvhs_score
> 6) return AVPROBE_SCORE_MAX
+ dvhs_score
- CHECK_COUNT
;
1300 else if( fec_score
> 6) return AVPROBE_SCORE_MAX
+ fec_score
- CHECK_COUNT
;
1303 /* only use the extension for safer guess */
1304 if (match_ext(p
->filename
, "ts"))
1305 return AVPROBE_SCORE_MAX
;
1311 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1312 (-1) if not available */
1313 static int parse_pcr(int64_t *ppcr_high
, int *ppcr_low
,
1314 const uint8_t *packet
)
1316 int afc
, len
, flags
;
1320 afc
= (packet
[3] >> 4) & 3;
1330 if (!(flags
& 0x10))
1335 *ppcr_high
= ((int64_t)v
<< 1) | (p
[4] >> 7);
1336 *ppcr_low
= ((p
[4] & 1) << 8) | p
[5];
1340 static int mpegts_read_header(AVFormatContext
*s
,
1341 AVFormatParameters
*ap
)
1343 MpegTSContext
*ts
= s
->priv_data
;
1344 ByteIOContext
*pb
= s
->pb
;
1345 uint8_t buf
[5*1024];
1350 ts
->mpeg2ts_compute_pcr
= ap
->mpeg2ts_compute_pcr
;
1351 if(ap
->mpeg2ts_raw
){
1352 av_log(s
, AV_LOG_ERROR
, "use mpegtsraw_demuxer!\n");
1357 /* read the first 1024 bytes to get packet size */
1358 pos
= url_ftell(pb
);
1359 len
= get_buffer(pb
, buf
, sizeof(buf
));
1360 if (len
!= sizeof(buf
))
1362 ts
->raw_packet_size
= get_packet_size(buf
, sizeof(buf
));
1363 if (ts
->raw_packet_size
<= 0)
1368 if (s
->iformat
== &mpegts_demuxer
) {
1371 /* first do a scaning to get all the services */
1372 url_fseek(pb
, pos
, SEEK_SET
);
1374 mpegts_open_section_filter(ts
, SDT_PID
, sdt_cb
, ts
, 1);
1376 mpegts_open_section_filter(ts
, PAT_PID
, pat_cb
, ts
, 1);
1378 handle_packets(ts
, s
->probesize
/ ts
->raw_packet_size
);
1379 /* if could not find service, enable auto_guess */
1383 dprintf(ts
->stream
, "tuning done\n");
1385 s
->ctx_flags
|= AVFMTCTX_NOHEADER
;
1388 int pcr_pid
, pid
, nb_packets
, nb_pcrs
, ret
, pcr_l
;
1389 int64_t pcrs
[2], pcr_h
;
1390 int packet_count
[2];
1391 uint8_t packet
[TS_PACKET_SIZE
];
1393 /* only read packets */
1395 st
= av_new_stream(s
, 0);
1398 av_set_pts_info(st
, 60, 1, 27000000);
1399 st
->codec
->codec_type
= CODEC_TYPE_DATA
;
1400 st
->codec
->codec_id
= CODEC_ID_MPEG2TS
;
1402 /* we iterate until we find two PCRs to estimate the bitrate */
1407 ret
= read_packet(s
, packet
, ts
->raw_packet_size
);
1410 pid
= AV_RB16(packet
+ 1) & 0x1fff;
1411 if ((pcr_pid
== -1 || pcr_pid
== pid
) &&
1412 parse_pcr(&pcr_h
, &pcr_l
, packet
) == 0) {
1414 packet_count
[nb_pcrs
] = nb_packets
;
1415 pcrs
[nb_pcrs
] = pcr_h
* 300 + pcr_l
;
1423 /* NOTE1: the bitrate is computed without the FEC */
1424 /* NOTE2: it is only the bitrate of the start of the stream */
1425 ts
->pcr_incr
= (pcrs
[1] - pcrs
[0]) / (packet_count
[1] - packet_count
[0]);
1426 ts
->cur_pcr
= pcrs
[0] - ts
->pcr_incr
* packet_count
[0];
1427 s
->bit_rate
= (TS_PACKET_SIZE
* 8) * 27e6
/ ts
->pcr_incr
;
1428 st
->codec
->bit_rate
= s
->bit_rate
;
1429 st
->start_time
= ts
->cur_pcr
;
1431 av_log(ts
->stream
, AV_LOG_DEBUG
, "start=%0.3f pcr=%0.3f incr=%d\n",
1432 st
->start_time
/ 1000000.0, pcrs
[0] / 27e6
, ts
->pcr_incr
);
1436 url_fseek(pb
, pos
, SEEK_SET
);
1442 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1444 static int mpegts_raw_read_packet(AVFormatContext
*s
,
1447 MpegTSContext
*ts
= s
->priv_data
;
1449 int64_t pcr_h
, next_pcr_h
, pos
;
1450 int pcr_l
, next_pcr_l
;
1451 uint8_t pcr_buf
[12];
1453 if (av_new_packet(pkt
, TS_PACKET_SIZE
) < 0)
1454 return AVERROR(ENOMEM
);
1455 pkt
->pos
= url_ftell(s
->pb
);
1456 ret
= read_packet(s
, pkt
->data
, ts
->raw_packet_size
);
1458 av_free_packet(pkt
);
1461 if (ts
->mpeg2ts_compute_pcr
) {
1462 /* compute exact PCR for each packet */
1463 if (parse_pcr(&pcr_h
, &pcr_l
, pkt
->data
) == 0) {
1464 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1465 pos
= url_ftell(s
->pb
);
1466 for(i
= 0; i
< MAX_PACKET_READAHEAD
; i
++) {
1467 url_fseek(s
->pb
, pos
+ i
* ts
->raw_packet_size
, SEEK_SET
);
1468 get_buffer(s
->pb
, pcr_buf
, 12);
1469 if (parse_pcr(&next_pcr_h
, &next_pcr_l
, pcr_buf
) == 0) {
1470 /* XXX: not precise enough */
1471 ts
->pcr_incr
= ((next_pcr_h
- pcr_h
) * 300 + (next_pcr_l
- pcr_l
)) /
1476 url_fseek(s
->pb
, pos
, SEEK_SET
);
1477 /* no next PCR found: we use previous increment */
1478 ts
->cur_pcr
= pcr_h
* 300 + pcr_l
;
1480 pkt
->pts
= ts
->cur_pcr
;
1481 pkt
->duration
= ts
->pcr_incr
;
1482 ts
->cur_pcr
+= ts
->pcr_incr
;
1484 pkt
->stream_index
= 0;
1488 static int mpegts_read_packet(AVFormatContext
*s
,
1491 MpegTSContext
*ts
= s
->priv_data
;
1494 if (url_ftell(s
->pb
) != ts
->last_pos
) {
1495 /* seek detected, flush pes buffer */
1496 for (i
= 0; i
< NB_PID_MAX
; i
++) {
1497 if (ts
->pids
[i
] && ts
->pids
[i
]->type
== MPEGTS_PES
) {
1498 PESContext
*pes
= ts
->pids
[i
]->u
.pes_filter
.opaque
;
1499 av_freep(&pes
->buffer
);
1500 pes
->data_index
= 0;
1501 pes
->state
= MPEGTS_SKIP
; /* skip until pes header */
1507 ret
= handle_packets(ts
, 0);
1509 /* flush pes data left */
1510 for (i
= 0; i
< NB_PID_MAX
; i
++) {
1511 if (ts
->pids
[i
] && ts
->pids
[i
]->type
== MPEGTS_PES
) {
1512 PESContext
*pes
= ts
->pids
[i
]->u
.pes_filter
.opaque
;
1513 if (pes
->state
== MPEGTS_PAYLOAD
&& pes
->data_index
> 0) {
1514 new_pes_packet(pes
, pkt
);
1515 pes
->state
= MPEGTS_SKIP
;
1523 ts
->last_pos
= url_ftell(s
->pb
);
1528 static int mpegts_read_close(AVFormatContext
*s
)
1530 MpegTSContext
*ts
= s
->priv_data
;
1535 for(i
=0;i
<NB_PID_MAX
;i
++)
1536 if (ts
->pids
[i
]) mpegts_close_filter(ts
, ts
->pids
[i
]);
1541 static int64_t mpegts_get_pcr(AVFormatContext
*s
, int stream_index
,
1542 int64_t *ppos
, int64_t pos_limit
)
1544 MpegTSContext
*ts
= s
->priv_data
;
1545 int64_t pos
, timestamp
;
1546 uint8_t buf
[TS_PACKET_SIZE
];
1547 int pcr_l
, pcr_pid
= ((PESContext
*)s
->streams
[stream_index
]->priv_data
)->pcr_pid
;
1548 const int find_next
= 1;
1549 pos
= ((*ppos
+ ts
->raw_packet_size
- 1 - ts
->pos47
) / ts
->raw_packet_size
) * ts
->raw_packet_size
+ ts
->pos47
;
1552 url_fseek(s
->pb
, pos
, SEEK_SET
);
1553 if (get_buffer(s
->pb
, buf
, TS_PACKET_SIZE
) != TS_PACKET_SIZE
)
1554 return AV_NOPTS_VALUE
;
1555 if ((pcr_pid
< 0 || (AV_RB16(buf
+ 1) & 0x1fff) == pcr_pid
) &&
1556 parse_pcr(×tamp
, &pcr_l
, buf
) == 0) {
1559 pos
+= ts
->raw_packet_size
;
1563 pos
-= ts
->raw_packet_size
;
1565 return AV_NOPTS_VALUE
;
1566 url_fseek(s
->pb
, pos
, SEEK_SET
);
1567 if (get_buffer(s
->pb
, buf
, TS_PACKET_SIZE
) != TS_PACKET_SIZE
)
1568 return AV_NOPTS_VALUE
;
1569 if ((pcr_pid
< 0 || (AV_RB16(buf
+ 1) & 0x1fff) == pcr_pid
) &&
1570 parse_pcr(×tamp
, &pcr_l
, buf
) == 0) {
1580 #ifdef USE_SYNCPOINT_SEARCH
1582 static int read_seek2(AVFormatContext
*s
,
1591 int64_t ts_ret
, ts_adj
;
1592 int stream_index_gen_search
;
1594 AVParserState
*backup
;
1596 backup
= ff_store_parser_state(s
);
1598 // detect direction of seeking for search purposes
1599 flags
|= (target_ts
- min_ts
> (uint64_t)(max_ts
- target_ts
)) ?
1600 AVSEEK_FLAG_BACKWARD
: 0;
1602 if (flags
& AVSEEK_FLAG_BYTE
) {
1603 // use position directly, we will search starting from it
1606 // search for some position with good timestamp match
1607 if (stream_index
< 0) {
1608 stream_index_gen_search
= av_find_default_stream_index(s
);
1609 if (stream_index_gen_search
< 0) {
1610 ff_restore_parser_state(s
, backup
);
1614 st
= s
->streams
[stream_index_gen_search
];
1615 // timestamp for default must be expressed in AV_TIME_BASE units
1616 ts_adj
= av_rescale(target_ts
,
1618 AV_TIME_BASE
* (int64_t)st
->time_base
.num
);
1621 stream_index_gen_search
= stream_index
;
1623 pos
= av_gen_search(s
, stream_index_gen_search
, ts_adj
,
1627 flags
, &ts_ret
, mpegts_get_pcr
);
1629 ff_restore_parser_state(s
, backup
);
1634 // search for actual matching keyframe/starting position for all streams
1635 if (ff_gen_syncpoint_search(s
, stream_index
, pos
,
1636 min_ts
, target_ts
, max_ts
,
1638 ff_restore_parser_state(s
, backup
);
1642 ff_free_parser_state(s
, backup
);
1646 static int read_seek(AVFormatContext
*s
, int stream_index
, int64_t target_ts
, int flags
)
1649 if (flags
& AVSEEK_FLAG_BACKWARD
) {
1650 flags
&= ~AVSEEK_FLAG_BACKWARD
;
1651 ret
= read_seek2(s
, stream_index
, INT64_MIN
, target_ts
, target_ts
, flags
);
1653 // for compatibility reasons, seek to the best-fitting timestamp
1654 ret
= read_seek2(s
, stream_index
, INT64_MIN
, target_ts
, INT64_MAX
, flags
);
1656 ret
= read_seek2(s
, stream_index
, target_ts
, target_ts
, INT64_MAX
, flags
);
1658 // for compatibility reasons, seek to the best-fitting timestamp
1659 ret
= read_seek2(s
, stream_index
, INT64_MIN
, target_ts
, INT64_MAX
, flags
);
1666 static int read_seek(AVFormatContext
*s
, int stream_index
, int64_t target_ts
, int flags
){
1667 MpegTSContext
*ts
= s
->priv_data
;
1668 uint8_t buf
[TS_PACKET_SIZE
];
1671 if(av_seek_frame_binary(s
, stream_index
, target_ts
, flags
) < 0)
1674 pos
= url_ftell(s
->pb
);
1677 url_fseek(s
->pb
, pos
, SEEK_SET
);
1678 if (get_buffer(s
->pb
, buf
, TS_PACKET_SIZE
) != TS_PACKET_SIZE
)
1680 // pid = AV_RB16(buf + 1) & 0x1fff;
1681 if(buf
[1] & 0x40) break;
1682 pos
+= ts
->raw_packet_size
;
1684 url_fseek(s
->pb
, pos
, SEEK_SET
);
1691 /**************************************************************/
1692 /* parsing functions - called from other demuxers such as RTP */
1694 MpegTSContext
*mpegts_parse_open(AVFormatContext
*s
)
1698 ts
= av_mallocz(sizeof(MpegTSContext
));
1701 /* no stream case, currently used by RTP */
1702 ts
->raw_packet_size
= TS_PACKET_SIZE
;
1708 /* return the consumed length if a packet was output, or -1 if no
1710 int mpegts_parse_packet(MpegTSContext
*ts
, AVPacket
*pkt
,
1711 const uint8_t *buf
, int len
)
1719 if (ts
->stop_parse
>0)
1721 if (len
< TS_PACKET_SIZE
)
1723 if (buf
[0] != 0x47) {
1727 handle_packet(ts
, buf
);
1728 buf
+= TS_PACKET_SIZE
;
1729 len
-= TS_PACKET_SIZE
;
1735 void mpegts_parse_close(MpegTSContext
*ts
)
1739 for(i
=0;i
<NB_PID_MAX
;i
++)
1740 av_free(ts
->pids
[i
]);
1744 AVInputFormat mpegts_demuxer
= {
1746 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1747 sizeof(MpegTSContext
),
1754 .flags
= AVFMT_SHOW_IDS
|AVFMT_TS_DISCONT
,
1755 #ifdef USE_SYNCPOINT_SEARCH
1756 .read_seek2
= read_seek2
,
1760 AVInputFormat mpegtsraw_demuxer
= {
1762 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1763 sizeof(MpegTSContext
),
1766 mpegts_raw_read_packet
,
1770 .flags
= AVFMT_SHOW_IDS
|AVFMT_TS_DISCONT
,
1771 #ifdef USE_SYNCPOINT_SEARCH
1772 .read_seek2
= read_seek2
,