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
22 #include "libavutil/crc.h"
29 /* 1.0 second at 24Mbit/s */
30 #define MAX_SCAN_PACKETS 32000
32 /* maximum size in which we look for synchronisation if
33 synchronisation is lost */
34 #define MAX_RESYNC_SIZE 4096
35 #define REGISTRATION_DESCRIPTOR 5
37 typedef struct PESContext PESContext
;
39 static PESContext
* add_pes_stream(MpegTSContext
*ts
, int pid
, int pcr_pid
, int stream_type
);
40 static AVStream
* new_pes_av_stream(PESContext
*pes
, uint32_t code
);
41 extern void av_set_program_name(AVProgram
*program
, char *provider_name
, char *name
);
42 extern void av_program_add_stream_index(AVFormatContext
*ac
, int progid
, unsigned int idx
);
44 enum MpegTSFilterType
{
49 typedef struct MpegTSFilter MpegTSFilter
;
51 typedef void PESCallback(MpegTSFilter
*f
, const uint8_t *buf
, int len
, int is_start
);
53 typedef struct MpegTSPESFilter
{
58 typedef void SectionCallback(MpegTSFilter
*f
, const uint8_t *buf
, int len
);
60 typedef void SetServiceCallback(void *opaque
, int ret
);
62 typedef struct MpegTSSectionFilter
{
66 unsigned int check_crc
:1;
67 unsigned int end_of_section_reached
:1;
68 SectionCallback
*section_cb
;
70 } MpegTSSectionFilter
;
74 int last_cc
; /* last cc code (-1 if first packet) */
75 enum MpegTSFilterType type
;
77 MpegTSPESFilter pes_filter
;
78 MpegTSSectionFilter section_filter
;
82 #define MAX_PIDS_PER_PROGRAM 64
84 unsigned int id
; //program id/service id
86 unsigned int pids
[MAX_PIDS_PER_PROGRAM
];
89 struct MpegTSContext
{
91 AVFormatContext
*stream
;
92 /** raw packet size, including FEC if present */
97 /** if true, all pids are analyzed to find streams */
100 /** compute exact PCR for each transport stream packet */
101 int mpeg2ts_compute_pcr
;
103 int64_t cur_pcr
; /**< used to estimate the exact PCR */
104 int pcr_incr
; /**< used to estimate the exact PCR */
106 /* data needed to handle file based ts */
107 /** stop parsing loop */
109 /** packet containing Audio/Video data */
112 /******************************************/
113 /* private mpegts data */
115 /** structure to keep track of Program->pids mapping */
120 /** filters for various streams specified by PMT + for the PAT and PMT */
121 MpegTSFilter
*pids
[NB_PID_MAX
];
124 /* TS stream handling */
128 MPEGTS_PESHEADER_FILL
,
133 /* enough for PES header + length */
134 #define PES_START_SIZE 9
135 #define MAX_PES_HEADER_SIZE (9 + 255)
139 int pcr_pid
; /**< if -1 then all packets containing PCR are considered */
142 AVFormatContext
*stream
;
144 enum MpegTSState state
;
145 /* used to get the format */
150 uint8_t header
[MAX_PES_HEADER_SIZE
];
153 extern AVInputFormat mpegts_demuxer
;
155 static void clear_program(MpegTSContext
*ts
, unsigned int programid
)
159 for(i
=0; i
<ts
->nb_prg
; i
++)
160 if(ts
->prg
[i
].id
== programid
)
161 ts
->prg
[i
].nb_pids
= 0;
164 static void clear_programs(MpegTSContext
*ts
)
170 static void add_pat_entry(MpegTSContext
*ts
, unsigned int programid
)
173 void *tmp
= av_realloc(ts
->prg
, (ts
->nb_prg
+1)*sizeof(Program_t
));
177 p
= &ts
->prg
[ts
->nb_prg
];
183 static void add_pid_to_pmt(MpegTSContext
*ts
, unsigned int programid
, unsigned int pid
)
187 for(i
=0; i
<ts
->nb_prg
; i
++) {
188 if(ts
->prg
[i
].id
== programid
) {
196 if(p
->nb_pids
>= MAX_PIDS_PER_PROGRAM
)
198 p
->pids
[p
->nb_pids
++] = pid
;
202 * \brief discard_pid() decides if the pid is to be discarded according
203 * to caller's programs selection
204 * \param ts : - TS context
206 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
209 static int discard_pid(MpegTSContext
*ts
, unsigned int pid
)
212 int used
= 0, discarded
= 0;
214 for(i
=0; i
<ts
->nb_prg
; i
++) {
216 for(j
=0; j
<p
->nb_pids
; j
++) {
217 if(p
->pids
[j
] != pid
)
219 //is program with id p->id set to be discarded?
220 for(k
=0; k
<ts
->stream
->nb_programs
; k
++) {
221 if(ts
->stream
->programs
[k
]->id
== p
->id
) {
222 if(ts
->stream
->programs
[k
]->discard
== AVDISCARD_ALL
)
231 return !used
&& discarded
;
235 * Assembles PES packets out of TS packets, and then calls the "section_cb"
236 * function when they are complete.
238 static void write_section_data(AVFormatContext
*s
, MpegTSFilter
*tss1
,
239 const uint8_t *buf
, int buf_size
, int is_start
)
241 MpegTSSectionFilter
*tss
= &tss1
->u
.section_filter
;
245 memcpy(tss
->section_buf
, buf
, buf_size
);
246 tss
->section_index
= buf_size
;
247 tss
->section_h_size
= -1;
248 tss
->end_of_section_reached
= 0;
250 if (tss
->end_of_section_reached
)
252 len
= 4096 - tss
->section_index
;
255 memcpy(tss
->section_buf
+ tss
->section_index
, buf
, len
);
256 tss
->section_index
+= len
;
259 /* compute section length if possible */
260 if (tss
->section_h_size
== -1 && tss
->section_index
>= 3) {
261 len
= (AV_RB16(tss
->section_buf
+ 1) & 0xfff) + 3;
264 tss
->section_h_size
= len
;
267 if (tss
->section_h_size
!= -1 && tss
->section_index
>= tss
->section_h_size
) {
268 tss
->end_of_section_reached
= 1;
269 if (!tss
->check_crc
||
270 av_crc(av_crc_get_table(AV_CRC_32_IEEE
), -1,
271 tss
->section_buf
, tss
->section_h_size
) == 0)
272 tss
->section_cb(tss1
, tss
->section_buf
, tss
->section_h_size
);
276 static MpegTSFilter
*mpegts_open_section_filter(MpegTSContext
*ts
, unsigned int pid
,
277 SectionCallback
*section_cb
, void *opaque
,
281 MpegTSFilter
*filter
;
282 MpegTSSectionFilter
*sec
;
285 av_log(ts
->stream
, AV_LOG_DEBUG
, "Filter: pid=0x%x\n", pid
);
287 if (pid
>= NB_PID_MAX
|| ts
->pids
[pid
])
289 filter
= av_mallocz(sizeof(MpegTSFilter
));
292 ts
->pids
[pid
] = filter
;
293 filter
->type
= MPEGTS_SECTION
;
295 filter
->last_cc
= -1;
296 sec
= &filter
->u
.section_filter
;
297 sec
->section_cb
= section_cb
;
298 sec
->opaque
= opaque
;
299 sec
->section_buf
= av_malloc(MAX_SECTION_SIZE
);
300 sec
->check_crc
= check_crc
;
301 if (!sec
->section_buf
) {
308 static MpegTSFilter
*mpegts_open_pes_filter(MpegTSContext
*ts
, unsigned int pid
,
312 MpegTSFilter
*filter
;
313 MpegTSPESFilter
*pes
;
315 if (pid
>= NB_PID_MAX
|| ts
->pids
[pid
])
317 filter
= av_mallocz(sizeof(MpegTSFilter
));
320 ts
->pids
[pid
] = filter
;
321 filter
->type
= MPEGTS_PES
;
323 filter
->last_cc
= -1;
324 pes
= &filter
->u
.pes_filter
;
325 pes
->pes_cb
= pes_cb
;
326 pes
->opaque
= opaque
;
330 static void mpegts_close_filter(MpegTSContext
*ts
, MpegTSFilter
*filter
)
335 if (filter
->type
== MPEGTS_SECTION
)
336 av_freep(&filter
->u
.section_filter
.section_buf
);
339 ts
->pids
[pid
] = NULL
;
342 static int analyze(const uint8_t *buf
, int size
, int packet_size
, int *index
){
343 int stat
[packet_size
];
348 memset(stat
, 0, packet_size
*sizeof(int));
350 for(x
=i
=0; i
<size
-3; i
++){
351 if(buf
[i
] == 0x47 && !(buf
[i
+1] & 0x80) && (buf
[i
+3] & 0x30)){
353 if(stat
[x
] > best_score
){
360 if(x
== packet_size
) x
= 0;
366 /* autodetect fec presence. Must have at least 1024 bytes */
367 static int get_packet_size(const uint8_t *buf
, int size
)
369 int score
, fec_score
, dvhs_score
;
371 if (size
< (TS_FEC_PACKET_SIZE
* 5 + 1))
374 score
= analyze(buf
, size
, TS_PACKET_SIZE
, NULL
);
375 dvhs_score
= analyze(buf
, size
, TS_DVHS_PACKET_SIZE
, NULL
);
376 fec_score
= analyze(buf
, size
, TS_FEC_PACKET_SIZE
, NULL
);
377 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
379 if (score
> fec_score
&& score
> dvhs_score
) return TS_PACKET_SIZE
;
380 else if(dvhs_score
> score
&& dvhs_score
> fec_score
) return TS_DVHS_PACKET_SIZE
;
381 else if(score
< fec_score
&& dvhs_score
< fec_score
) return TS_FEC_PACKET_SIZE
;
385 typedef struct SectionHeader
{
390 uint8_t last_sec_num
;
393 static inline int get8(const uint8_t **pp
, const uint8_t *p_end
)
406 static inline int get16(const uint8_t **pp
, const uint8_t *p_end
)
412 if ((p
+ 1) >= p_end
)
420 /* read and allocate a DVB string preceeded by its length */
421 static char *getstr8(const uint8_t **pp
, const uint8_t *p_end
)
428 len
= get8(&p
, p_end
);
431 if ((p
+ len
) > p_end
)
433 str
= av_malloc(len
+ 1);
443 static int parse_section_header(SectionHeader
*h
,
444 const uint8_t **pp
, const uint8_t *p_end
)
448 val
= get8(pp
, p_end
);
453 val
= get16(pp
, p_end
);
457 val
= get8(pp
, p_end
);
460 h
->version
= (val
>> 1) & 0x1f;
461 val
= get8(pp
, p_end
);
465 val
= get8(pp
, p_end
);
468 h
->last_sec_num
= val
;
473 static void pmt_cb(MpegTSFilter
*filter
, const uint8_t *section
, int section_len
)
475 MpegTSContext
*ts
= filter
->u
.section_filter
.opaque
;
476 SectionHeader h1
, *h
= &h1
;
479 const uint8_t *p
, *p_end
, *desc_list_end
, *desc_end
;
480 int program_info_length
, pcr_pid
, pid
, stream_type
;
481 int desc_list_len
, desc_len
, desc_tag
;
482 int comp_page
= 0, anc_page
= 0; /* initialize to kill warnings */
483 char language
[4] = {0}; /* initialize to kill warnings */
484 int has_hdmv_descr
= 0;
485 int has_dirac_descr
= 0;
488 av_log(ts
->stream
, AV_LOG_DEBUG
, "PMT: len %i\n", section_len
);
489 av_hex_dump_log(ts
->stream
, AV_LOG_DEBUG
, (uint8_t *)section
, section_len
);
491 p_end
= section
+ section_len
- 4;
493 if (parse_section_header(h
, &p
, p_end
) < 0)
496 av_log(ts
->stream
, AV_LOG_DEBUG
, "sid=0x%x sec_num=%d/%d\n",
497 h
->id
, h
->sec_num
, h
->last_sec_num
);
499 if (h
->tid
!= PMT_TID
)
502 clear_program(ts
, h
->id
);
503 pcr_pid
= get16(&p
, p_end
) & 0x1fff;
506 add_pid_to_pmt(ts
, h
->id
, pcr_pid
);
508 av_log(ts
->stream
, AV_LOG_DEBUG
, "pcr_pid=0x%x\n", pcr_pid
);
510 program_info_length
= get16(&p
, p_end
) & 0xfff;
511 if (program_info_length
< 0)
513 while(program_info_length
>= 2) {
515 tag
= get8(&p
, p_end
);
516 len
= get8(&p
, p_end
);
517 if(len
> program_info_length
- 2)
518 //something else is broken, exit the program_descriptors_loop
520 program_info_length
-= len
+ 2;
521 if(tag
== REGISTRATION_DESCRIPTOR
&& len
>= 4) {
523 bytes
[0] = get8(&p
, p_end
);
524 bytes
[1] = get8(&p
, p_end
);
525 bytes
[2] = get8(&p
, p_end
);
526 bytes
[3] = get8(&p
, p_end
);
528 if(bytes
[0] == 'H' && bytes
[1] == 'D' &&
529 bytes
[2] == 'M' && bytes
[3] == 'V')
534 p
+= program_info_length
;
540 stream_type
= get8(&p
, p_end
);
543 pid
= get16(&p
, p_end
) & 0x1fff;
546 desc_list_len
= get16(&p
, p_end
) & 0xfff;
547 if (desc_list_len
< 0)
549 desc_list_end
= p
+ desc_list_len
;
550 if (desc_list_end
> p_end
)
553 desc_tag
= get8(&p
, desc_list_end
);
556 if (stream_type
== STREAM_TYPE_PRIVATE_DATA
) {
557 if((desc_tag
== 0x6A) || (desc_tag
== 0x7A)) {
558 /*assume DVB AC-3 Audio*/
559 stream_type
= STREAM_TYPE_AUDIO_AC3
;
560 } else if(desc_tag
== 0x7B) {
562 stream_type
= STREAM_TYPE_AUDIO_DTS
;
565 desc_len
= get8(&p
, desc_list_end
);
566 desc_end
= p
+ desc_len
;
567 if (desc_end
> desc_list_end
)
570 av_log(ts
->stream
, AV_LOG_DEBUG
, "tag: 0x%02x len=%d\n",
574 case DVB_SUBT_DESCID
:
575 if (stream_type
== STREAM_TYPE_PRIVATE_DATA
)
576 stream_type
= STREAM_TYPE_SUBTITLE_DVB
;
578 language
[0] = get8(&p
, desc_end
);
579 language
[1] = get8(&p
, desc_end
);
580 language
[2] = get8(&p
, desc_end
);
583 comp_page
= get16(&p
, desc_end
);
584 anc_page
= get16(&p
, desc_end
);
587 case 0x0a: /* ISO 639 language descriptor */
588 language
[0] = get8(&p
, desc_end
);
589 language
[1] = get8(&p
, desc_end
);
590 language
[2] = get8(&p
, desc_end
);
593 case REGISTRATION_DESCRIPTOR
: /*MPEG-2 Registration descriptor */
596 bytes
[0] = get8(&p
, desc_end
);
597 bytes
[1] = get8(&p
, desc_end
);
598 bytes
[2] = get8(&p
, desc_end
);
599 bytes
[3] = get8(&p
, desc_end
);
600 if(bytes
[0] == 'd' && bytes
[1] == 'r' &&
601 bytes
[2] == 'a' && bytes
[3] == 'c')
613 av_log(ts
->stream
, AV_LOG_DEBUG
, "stream_type=%d pid=0x%x\n",
617 /* now create ffmpeg stream */
618 switch(stream_type
) {
619 case STREAM_TYPE_AUDIO_MPEG1
:
620 case STREAM_TYPE_AUDIO_MPEG2
:
621 case STREAM_TYPE_VIDEO_MPEG1
:
622 case STREAM_TYPE_VIDEO_MPEG2
:
623 case STREAM_TYPE_VIDEO_MPEG4
:
624 case STREAM_TYPE_VIDEO_H264
:
625 case STREAM_TYPE_VIDEO_VC1
:
626 case STREAM_TYPE_VIDEO_DIRAC
:
627 case STREAM_TYPE_AUDIO_AAC
:
628 case STREAM_TYPE_AUDIO_AC3
:
629 case STREAM_TYPE_AUDIO_DTS
:
630 case STREAM_TYPE_AUDIO_HDMV_DTS
:
631 case STREAM_TYPE_SUBTITLE_DVB
:
632 if((stream_type
== STREAM_TYPE_AUDIO_HDMV_DTS
&& !has_hdmv_descr
)
633 || (stream_type
== STREAM_TYPE_VIDEO_DIRAC
&& !has_dirac_descr
))
635 if(ts
->pids
[pid
] && ts
->pids
[pid
]->type
== MPEGTS_PES
){
636 pes
= ts
->pids
[pid
]->u
.pes_filter
.opaque
;
639 if (ts
->pids
[pid
]) mpegts_close_filter(ts
, ts
->pids
[pid
]); //wrongly added sdt filter probably
640 pes
= add_pes_stream(ts
, pid
, pcr_pid
, stream_type
);
642 st
= new_pes_av_stream(pes
, 0);
644 add_pid_to_pmt(ts
, h
->id
, pid
);
646 av_program_add_stream_index(ts
->stream
, h
->id
, st
->index
);
649 /* we ignore the other streams */
654 if (language
[0] != 0) {
655 memcpy(st
->language
, language
, 4);
658 if (stream_type
== STREAM_TYPE_SUBTITLE_DVB
) {
659 st
->codec
->sub_id
= (anc_page
<< 16) | comp_page
;
663 /* all parameters are there */
665 mpegts_close_filter(ts
, filter
);
668 static void pat_cb(MpegTSFilter
*filter
, const uint8_t *section
, int section_len
)
670 MpegTSContext
*ts
= filter
->u
.section_filter
.opaque
;
671 SectionHeader h1
, *h
= &h1
;
672 const uint8_t *p
, *p_end
;
676 av_log(ts
->stream
, AV_LOG_DEBUG
, "PAT:\n");
677 av_hex_dump_log(ts
->stream
, AV_LOG_DEBUG
, (uint8_t *)section
, section_len
);
679 p_end
= section
+ section_len
- 4;
681 if (parse_section_header(h
, &p
, p_end
) < 0)
683 if (h
->tid
!= PAT_TID
)
688 sid
= get16(&p
, p_end
);
691 pmt_pid
= get16(&p
, p_end
) & 0x1fff;
695 av_log(ts
->stream
, AV_LOG_DEBUG
, "sid=0x%x pid=0x%x\n", sid
, pmt_pid
);
700 av_new_program(ts
->stream
, sid
);
702 mpegts_open_section_filter(ts
, pmt_pid
, pmt_cb
, ts
, 1);
703 add_pat_entry(ts
, sid
);
704 add_pid_to_pmt(ts
, sid
, 0); //add pat pid to program
705 add_pid_to_pmt(ts
, sid
, pmt_pid
);
711 mpegts_close_filter(ts
, filter
);
714 static void mpegts_set_service(MpegTSContext
*ts
)
716 mpegts_open_section_filter(ts
, PAT_PID
,
720 static void sdt_cb(MpegTSFilter
*filter
, const uint8_t *section
, int section_len
)
722 MpegTSContext
*ts
= filter
->u
.section_filter
.opaque
;
723 SectionHeader h1
, *h
= &h1
;
724 const uint8_t *p
, *p_end
, *desc_list_end
, *desc_end
;
725 int onid
, val
, sid
, desc_list_len
, desc_tag
, desc_len
, service_type
;
726 char *name
, *provider_name
;
729 av_log(ts
->stream
, AV_LOG_DEBUG
, "SDT:\n");
730 av_hex_dump_log(ts
->stream
, AV_LOG_DEBUG
, (uint8_t *)section
, section_len
);
733 p_end
= section
+ section_len
- 4;
735 if (parse_section_header(h
, &p
, p_end
) < 0)
737 if (h
->tid
!= SDT_TID
)
739 onid
= get16(&p
, p_end
);
742 val
= get8(&p
, p_end
);
746 sid
= get16(&p
, p_end
);
749 val
= get8(&p
, p_end
);
752 desc_list_len
= get16(&p
, p_end
) & 0xfff;
753 if (desc_list_len
< 0)
755 desc_list_end
= p
+ desc_list_len
;
756 if (desc_list_end
> p_end
)
759 desc_tag
= get8(&p
, desc_list_end
);
762 desc_len
= get8(&p
, desc_list_end
);
763 desc_end
= p
+ desc_len
;
764 if (desc_end
> desc_list_end
)
767 av_log(ts
->stream
, AV_LOG_DEBUG
, "tag: 0x%02x len=%d\n",
772 service_type
= get8(&p
, p_end
);
773 if (service_type
< 0)
775 provider_name
= getstr8(&p
, p_end
);
778 name
= getstr8(&p
, p_end
);
780 AVProgram
*program
= av_new_program(ts
->stream
, sid
);
782 av_set_program_name(program
, provider_name
, name
);
785 av_free(provider_name
);
796 /* scan services in a transport stream by looking at the SDT */
797 static void mpegts_scan_sdt(MpegTSContext
*ts
)
799 mpegts_open_section_filter(ts
, SDT_PID
,
803 static int64_t get_pts(const uint8_t *p
)
805 int64_t pts
= (int64_t)((p
[0] >> 1) & 0x07) << 30;
806 pts
|= (AV_RB16(p
+ 1) >> 1) << 15;
807 pts
|= AV_RB16(p
+ 3) >> 1;
811 /* return non zero if a packet could be constructed */
812 static void mpegts_push_data(MpegTSFilter
*filter
,
813 const uint8_t *buf
, int buf_size
, int is_start
)
815 PESContext
*pes
= filter
->u
.pes_filter
.opaque
;
816 MpegTSContext
*ts
= pes
->ts
;
824 pes
->state
= MPEGTS_HEADER
;
828 while (buf_size
> 0) {
831 len
= PES_START_SIZE
- pes
->data_index
;
834 memcpy(pes
->header
+ pes
->data_index
, p
, len
);
835 pes
->data_index
+= len
;
838 if (pes
->data_index
== PES_START_SIZE
) {
839 /* we got all the PES or section header. We can now
842 av_hex_dump_log(pes
->stream
, AV_LOG_DEBUG
, pes
->header
, pes
->data_index
);
844 if (pes
->header
[0] == 0x00 && pes
->header
[1] == 0x00 &&
845 pes
->header
[2] == 0x01) {
846 /* it must be an mpeg2 PES stream */
847 code
= pes
->header
[3] | 0x100;
848 if (!((code
>= 0x1c0 && code
<= 0x1df) ||
849 (code
>= 0x1e0 && code
<= 0x1ef) ||
850 (code
== 0x1bd) || (code
== 0x1fd)))
853 /* allocate stream */
854 new_pes_av_stream(pes
, code
);
856 pes
->state
= MPEGTS_PESHEADER_FILL
;
857 pes
->total_size
= AV_RB16(pes
->header
+ 4);
858 /* NOTE: a zero total size means the PES size is
861 pes
->total_size
+= 6;
862 pes
->pes_header_size
= pes
->header
[8] + 9;
864 /* otherwise, it should be a table */
867 pes
->state
= MPEGTS_SKIP
;
872 /**********************************************/
873 /* PES packing parsing */
874 case MPEGTS_PESHEADER_FILL
:
875 len
= pes
->pes_header_size
- pes
->data_index
;
878 memcpy(pes
->header
+ pes
->data_index
, p
, len
);
879 pes
->data_index
+= len
;
882 if (pes
->data_index
== pes
->pes_header_size
) {
886 flags
= pes
->header
[7];
888 pes
->pts
= AV_NOPTS_VALUE
;
889 pes
->dts
= AV_NOPTS_VALUE
;
890 if ((flags
& 0xc0) == 0x80) {
891 pes
->pts
= get_pts(r
);
893 } else if ((flags
& 0xc0) == 0xc0) {
894 pes
->pts
= get_pts(r
);
896 pes
->dts
= get_pts(r
);
899 /* we got the full header. We parse it and get the payload */
900 pes
->state
= MPEGTS_PAYLOAD
;
904 if (pes
->total_size
) {
905 len
= pes
->total_size
- pes
->data_index
;
912 AVPacket
*pkt
= ts
->pkt
;
913 if (pes
->st
&& av_new_packet(pkt
, len
) == 0) {
914 memcpy(pkt
->data
, p
, len
);
915 pkt
->stream_index
= pes
->st
->index
;
918 /* reset pts values */
919 pes
->pts
= AV_NOPTS_VALUE
;
920 pes
->dts
= AV_NOPTS_VALUE
;
934 static AVStream
* new_pes_av_stream(PESContext
*pes
, uint32_t code
)
937 enum CodecID codec_id
;
938 enum CodecType codec_type
;
940 switch(pes
->stream_type
){
941 case STREAM_TYPE_AUDIO_MPEG1
:
942 case STREAM_TYPE_AUDIO_MPEG2
:
943 codec_type
= CODEC_TYPE_AUDIO
;
944 codec_id
= CODEC_ID_MP3
;
946 case STREAM_TYPE_VIDEO_MPEG1
:
947 case STREAM_TYPE_VIDEO_MPEG2
:
948 codec_type
= CODEC_TYPE_VIDEO
;
949 codec_id
= CODEC_ID_MPEG2VIDEO
;
951 case STREAM_TYPE_VIDEO_MPEG4
:
952 codec_type
= CODEC_TYPE_VIDEO
;
953 codec_id
= CODEC_ID_MPEG4
;
955 case STREAM_TYPE_VIDEO_H264
:
956 codec_type
= CODEC_TYPE_VIDEO
;
957 codec_id
= CODEC_ID_H264
;
959 case STREAM_TYPE_VIDEO_VC1
:
960 codec_type
= CODEC_TYPE_VIDEO
;
961 codec_id
= CODEC_ID_VC1
;
963 case STREAM_TYPE_VIDEO_DIRAC
:
964 codec_type
= CODEC_TYPE_VIDEO
;
965 codec_id
= CODEC_ID_DIRAC
;
967 case STREAM_TYPE_AUDIO_AAC
:
968 codec_type
= CODEC_TYPE_AUDIO
;
969 codec_id
= CODEC_ID_AAC
;
971 case STREAM_TYPE_AUDIO_AC3
:
972 codec_type
= CODEC_TYPE_AUDIO
;
973 codec_id
= CODEC_ID_AC3
;
975 case STREAM_TYPE_AUDIO_DTS
:
976 case STREAM_TYPE_AUDIO_HDMV_DTS
:
977 codec_type
= CODEC_TYPE_AUDIO
;
978 codec_id
= CODEC_ID_DTS
;
980 case STREAM_TYPE_SUBTITLE_DVB
:
981 codec_type
= CODEC_TYPE_SUBTITLE
;
982 codec_id
= CODEC_ID_DVB_SUBTITLE
;
985 if (code
>= 0x1c0 && code
<= 0x1df) {
986 codec_type
= CODEC_TYPE_AUDIO
;
987 codec_id
= CODEC_ID_MP2
;
988 } else if (code
== 0x1bd) {
989 codec_type
= CODEC_TYPE_AUDIO
;
990 codec_id
= CODEC_ID_AC3
;
992 codec_type
= CODEC_TYPE_VIDEO
;
993 codec_id
= CODEC_ID_PROBE
;
997 st
= av_new_stream(pes
->stream
, pes
->pid
);
999 av_set_pts_info(st
, 33, 1, 90000);
1000 st
->priv_data
= pes
;
1001 st
->codec
->codec_type
= codec_type
;
1002 st
->codec
->codec_id
= codec_id
;
1003 st
->need_parsing
= AVSTREAM_PARSE_FULL
;
1010 static PESContext
*add_pes_stream(MpegTSContext
*ts
, int pid
, int pcr_pid
, int stream_type
)
1015 /* if no pid found, then add a pid context */
1016 pes
= av_mallocz(sizeof(PESContext
));
1020 pes
->stream
= ts
->stream
;
1022 pes
->pcr_pid
= pcr_pid
;
1023 pes
->stream_type
= stream_type
;
1024 tss
= mpegts_open_pes_filter(ts
, pid
, mpegts_push_data
, pes
);
1032 /* handle one TS packet */
1033 static void handle_packet(MpegTSContext
*ts
, const uint8_t *packet
)
1035 AVFormatContext
*s
= ts
->stream
;
1037 int len
, pid
, cc
, cc_ok
, afc
, is_start
;
1038 const uint8_t *p
, *p_end
;
1040 pid
= AV_RB16(packet
+ 1) & 0x1fff;
1041 if(pid
&& discard_pid(ts
, pid
))
1043 is_start
= packet
[1] & 0x40;
1044 tss
= ts
->pids
[pid
];
1045 if (ts
->auto_guess
&& tss
== NULL
&& is_start
) {
1046 add_pes_stream(ts
, pid
, -1, 0);
1047 tss
= ts
->pids
[pid
];
1052 /* continuity check (currently not used) */
1053 cc
= (packet
[3] & 0xf);
1054 cc_ok
= (tss
->last_cc
< 0) || ((((tss
->last_cc
+ 1) & 0x0f) == cc
));
1057 /* skip adaptation field */
1058 afc
= (packet
[3] >> 4) & 3;
1060 if (afc
== 0) /* reserved value */
1062 if (afc
== 2) /* adaptation field only */
1065 /* skip adapation field */
1068 /* if past the end of packet, ignore */
1069 p_end
= packet
+ TS_PACKET_SIZE
;
1073 ts
->pos47
= url_ftell(ts
->stream
->pb
) % ts
->raw_packet_size
;
1075 if (tss
->type
== MPEGTS_SECTION
) {
1077 /* pointer field present */
1079 if (p
+ len
> p_end
)
1082 /* write remaining section bytes */
1083 write_section_data(s
, tss
,
1085 /* check whether filter has been closed */
1091 write_section_data(s
, tss
,
1096 write_section_data(s
, tss
,
1101 tss
->u
.pes_filter
.pes_cb(tss
,
1102 p
, p_end
- p
, is_start
);
1106 /* XXX: try to find a better synchro over several packets (use
1107 get_packet_size() ?) */
1108 static int mpegts_resync(ByteIOContext
*pb
)
1112 for(i
= 0;i
< MAX_RESYNC_SIZE
; i
++) {
1117 url_fseek(pb
, -1, SEEK_CUR
);
1125 /* return -1 if error or EOF. Return 0 if OK. */
1126 static int read_packet(ByteIOContext
*pb
, uint8_t *buf
, int raw_packet_size
)
1131 len
= get_buffer(pb
, buf
, TS_PACKET_SIZE
);
1132 if (len
!= TS_PACKET_SIZE
)
1133 return AVERROR(EIO
);
1134 /* check paquet sync byte */
1135 if (buf
[0] != 0x47) {
1136 /* find a new packet start */
1137 url_fseek(pb
, -TS_PACKET_SIZE
, SEEK_CUR
);
1138 if (mpegts_resync(pb
) < 0)
1139 return AVERROR_INVALIDDATA
;
1143 skip
= raw_packet_size
- TS_PACKET_SIZE
;
1145 url_fskip(pb
, skip
);
1152 static int handle_packets(MpegTSContext
*ts
, int nb_packets
)
1154 AVFormatContext
*s
= ts
->stream
;
1155 ByteIOContext
*pb
= s
->pb
;
1156 uint8_t packet
[TS_PACKET_SIZE
];
1157 int packet_num
, ret
;
1162 if (ts
->stop_parse
>0)
1165 if (nb_packets
!= 0 && packet_num
>= nb_packets
)
1167 ret
= read_packet(pb
, packet
, ts
->raw_packet_size
);
1170 handle_packet(ts
, packet
);
1175 static int mpegts_probe(AVProbeData
*p
)
1178 const int size
= p
->buf_size
;
1179 int score
, fec_score
, dvhs_score
;
1180 #define CHECK_COUNT 10
1182 if (size
< (TS_FEC_PACKET_SIZE
* CHECK_COUNT
))
1185 score
= analyze(p
->buf
, TS_PACKET_SIZE
*CHECK_COUNT
, TS_PACKET_SIZE
, NULL
);
1186 dvhs_score
= analyze(p
->buf
, TS_DVHS_PACKET_SIZE
*CHECK_COUNT
, TS_DVHS_PACKET_SIZE
, NULL
);
1187 fec_score
= analyze(p
->buf
, TS_FEC_PACKET_SIZE
*CHECK_COUNT
, TS_FEC_PACKET_SIZE
, NULL
);
1188 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1190 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1191 if (score
> fec_score
&& score
> dvhs_score
&& score
> 6) return AVPROBE_SCORE_MAX
+ score
- CHECK_COUNT
;
1192 else if(dvhs_score
> score
&& dvhs_score
> fec_score
&& dvhs_score
> 6) return AVPROBE_SCORE_MAX
+ dvhs_score
- CHECK_COUNT
;
1193 else if( fec_score
> 6) return AVPROBE_SCORE_MAX
+ fec_score
- CHECK_COUNT
;
1196 /* only use the extension for safer guess */
1197 if (match_ext(p
->filename
, "ts"))
1198 return AVPROBE_SCORE_MAX
;
1204 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1205 (-1) if not available */
1206 static int parse_pcr(int64_t *ppcr_high
, int *ppcr_low
,
1207 const uint8_t *packet
)
1209 int afc
, len
, flags
;
1213 afc
= (packet
[3] >> 4) & 3;
1223 if (!(flags
& 0x10))
1228 *ppcr_high
= ((int64_t)v
<< 1) | (p
[4] >> 7);
1229 *ppcr_low
= ((p
[4] & 1) << 8) | p
[5];
1233 static int mpegts_read_header(AVFormatContext
*s
,
1234 AVFormatParameters
*ap
)
1236 MpegTSContext
*ts
= s
->priv_data
;
1237 ByteIOContext
*pb
= s
->pb
;
1243 ts
->mpeg2ts_compute_pcr
= ap
->mpeg2ts_compute_pcr
;
1244 if(ap
->mpeg2ts_raw
){
1245 av_log(s
, AV_LOG_ERROR
, "use mpegtsraw_demuxer!\n");
1250 /* read the first 1024 bytes to get packet size */
1251 pos
= url_ftell(pb
);
1252 len
= get_buffer(pb
, buf
, sizeof(buf
));
1253 if (len
!= sizeof(buf
))
1255 ts
->raw_packet_size
= get_packet_size(buf
, sizeof(buf
));
1256 if (ts
->raw_packet_size
<= 0)
1261 if (s
->iformat
== &mpegts_demuxer
) {
1264 /* first do a scaning to get all the services */
1265 url_fseek(pb
, pos
, SEEK_SET
);
1266 mpegts_scan_sdt(ts
);
1268 mpegts_set_service(ts
);
1270 handle_packets(ts
, s
->probesize
);
1271 /* if could not find service, enable auto_guess */
1276 av_log(ts
->stream
, AV_LOG_DEBUG
, "tuning done\n");
1278 s
->ctx_flags
|= AVFMTCTX_NOHEADER
;
1281 int pcr_pid
, pid
, nb_packets
, nb_pcrs
, ret
, pcr_l
;
1282 int64_t pcrs
[2], pcr_h
;
1283 int packet_count
[2];
1284 uint8_t packet
[TS_PACKET_SIZE
];
1286 /* only read packets */
1288 st
= av_new_stream(s
, 0);
1291 av_set_pts_info(st
, 60, 1, 27000000);
1292 st
->codec
->codec_type
= CODEC_TYPE_DATA
;
1293 st
->codec
->codec_id
= CODEC_ID_MPEG2TS
;
1295 /* we iterate until we find two PCRs to estimate the bitrate */
1300 ret
= read_packet(s
->pb
, packet
, ts
->raw_packet_size
);
1303 pid
= AV_RB16(packet
+ 1) & 0x1fff;
1304 if ((pcr_pid
== -1 || pcr_pid
== pid
) &&
1305 parse_pcr(&pcr_h
, &pcr_l
, packet
) == 0) {
1307 packet_count
[nb_pcrs
] = nb_packets
;
1308 pcrs
[nb_pcrs
] = pcr_h
* 300 + pcr_l
;
1316 /* NOTE1: the bitrate is computed without the FEC */
1317 /* NOTE2: it is only the bitrate of the start of the stream */
1318 ts
->pcr_incr
= (pcrs
[1] - pcrs
[0]) / (packet_count
[1] - packet_count
[0]);
1319 ts
->cur_pcr
= pcrs
[0] - ts
->pcr_incr
* packet_count
[0];
1320 s
->bit_rate
= (TS_PACKET_SIZE
* 8) * 27e6
/ ts
->pcr_incr
;
1321 st
->codec
->bit_rate
= s
->bit_rate
;
1322 st
->start_time
= ts
->cur_pcr
;
1324 av_log(ts
->stream
, AV_LOG_DEBUG
, "start=%0.3f pcr=%0.3f incr=%d\n",
1325 st
->start_time
/ 1000000.0, pcrs
[0] / 27e6
, ts
->pcr_incr
);
1329 url_fseek(pb
, pos
, SEEK_SET
);
1335 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1337 static int mpegts_raw_read_packet(AVFormatContext
*s
,
1340 MpegTSContext
*ts
= s
->priv_data
;
1342 int64_t pcr_h
, next_pcr_h
, pos
;
1343 int pcr_l
, next_pcr_l
;
1344 uint8_t pcr_buf
[12];
1346 if (av_new_packet(pkt
, TS_PACKET_SIZE
) < 0)
1347 return AVERROR(ENOMEM
);
1348 pkt
->pos
= url_ftell(s
->pb
);
1349 ret
= read_packet(s
->pb
, pkt
->data
, ts
->raw_packet_size
);
1351 av_free_packet(pkt
);
1354 if (ts
->mpeg2ts_compute_pcr
) {
1355 /* compute exact PCR for each packet */
1356 if (parse_pcr(&pcr_h
, &pcr_l
, pkt
->data
) == 0) {
1357 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1358 pos
= url_ftell(s
->pb
);
1359 for(i
= 0; i
< MAX_PACKET_READAHEAD
; i
++) {
1360 url_fseek(s
->pb
, pos
+ i
* ts
->raw_packet_size
, SEEK_SET
);
1361 get_buffer(s
->pb
, pcr_buf
, 12);
1362 if (parse_pcr(&next_pcr_h
, &next_pcr_l
, pcr_buf
) == 0) {
1363 /* XXX: not precise enough */
1364 ts
->pcr_incr
= ((next_pcr_h
- pcr_h
) * 300 + (next_pcr_l
- pcr_l
)) /
1369 url_fseek(s
->pb
, pos
, SEEK_SET
);
1370 /* no next PCR found: we use previous increment */
1371 ts
->cur_pcr
= pcr_h
* 300 + pcr_l
;
1373 pkt
->pts
= ts
->cur_pcr
;
1374 pkt
->duration
= ts
->pcr_incr
;
1375 ts
->cur_pcr
+= ts
->pcr_incr
;
1377 pkt
->stream_index
= 0;
1381 static int mpegts_read_packet(AVFormatContext
*s
,
1384 MpegTSContext
*ts
= s
->priv_data
;
1387 return handle_packets(ts
, 0);
1390 static int mpegts_read_close(AVFormatContext
*s
)
1392 MpegTSContext
*ts
= s
->priv_data
;
1397 for(i
=0;i
<NB_PID_MAX
;i
++)
1398 if (ts
->pids
[i
]) mpegts_close_filter(ts
, ts
->pids
[i
]);
1403 static int64_t mpegts_get_pcr(AVFormatContext
*s
, int stream_index
,
1404 int64_t *ppos
, int64_t pos_limit
)
1406 MpegTSContext
*ts
= s
->priv_data
;
1407 int64_t pos
, timestamp
;
1408 uint8_t buf
[TS_PACKET_SIZE
];
1409 int pcr_l
, pcr_pid
= ((PESContext
*)s
->streams
[stream_index
]->priv_data
)->pcr_pid
;
1410 const int find_next
= 1;
1411 pos
= ((*ppos
+ ts
->raw_packet_size
- 1 - ts
->pos47
) / ts
->raw_packet_size
) * ts
->raw_packet_size
+ ts
->pos47
;
1414 url_fseek(s
->pb
, pos
, SEEK_SET
);
1415 if (get_buffer(s
->pb
, buf
, TS_PACKET_SIZE
) != TS_PACKET_SIZE
)
1416 return AV_NOPTS_VALUE
;
1417 if ((pcr_pid
< 0 || (AV_RB16(buf
+ 1) & 0x1fff) == pcr_pid
) &&
1418 parse_pcr(×tamp
, &pcr_l
, buf
) == 0) {
1421 pos
+= ts
->raw_packet_size
;
1425 pos
-= ts
->raw_packet_size
;
1427 return AV_NOPTS_VALUE
;
1428 url_fseek(s
->pb
, pos
, SEEK_SET
);
1429 if (get_buffer(s
->pb
, buf
, TS_PACKET_SIZE
) != TS_PACKET_SIZE
)
1430 return AV_NOPTS_VALUE
;
1431 if ((pcr_pid
< 0 || (AV_RB16(buf
+ 1) & 0x1fff) == pcr_pid
) &&
1432 parse_pcr(×tamp
, &pcr_l
, buf
) == 0) {
1442 static int read_seek(AVFormatContext
*s
, int stream_index
, int64_t target_ts
, int flags
){
1443 MpegTSContext
*ts
= s
->priv_data
;
1444 uint8_t buf
[TS_PACKET_SIZE
];
1447 if(av_seek_frame_binary(s
, stream_index
, target_ts
, flags
) < 0)
1450 pos
= url_ftell(s
->pb
);
1453 url_fseek(s
->pb
, pos
, SEEK_SET
);
1454 if (get_buffer(s
->pb
, buf
, TS_PACKET_SIZE
) != TS_PACKET_SIZE
)
1456 // pid = AV_RB16(buf + 1) & 0x1fff;
1457 if(buf
[1] & 0x40) break;
1458 pos
+= ts
->raw_packet_size
;
1460 url_fseek(s
->pb
, pos
, SEEK_SET
);
1465 /**************************************************************/
1466 /* parsing functions - called from other demuxers such as RTP */
1468 MpegTSContext
*mpegts_parse_open(AVFormatContext
*s
)
1472 ts
= av_mallocz(sizeof(MpegTSContext
));
1475 /* no stream case, currently used by RTP */
1476 ts
->raw_packet_size
= TS_PACKET_SIZE
;
1482 /* return the consumed length if a packet was output, or -1 if no
1484 int mpegts_parse_packet(MpegTSContext
*ts
, AVPacket
*pkt
,
1485 const uint8_t *buf
, int len
)
1493 if (ts
->stop_parse
>0)
1495 if (len
< TS_PACKET_SIZE
)
1497 if (buf
[0] != 0x47) {
1501 handle_packet(ts
, buf
);
1502 buf
+= TS_PACKET_SIZE
;
1503 len
-= TS_PACKET_SIZE
;
1509 void mpegts_parse_close(MpegTSContext
*ts
)
1513 for(i
=0;i
<NB_PID_MAX
;i
++)
1514 av_free(ts
->pids
[i
]);
1518 AVInputFormat mpegts_demuxer
= {
1520 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1521 sizeof(MpegTSContext
),
1528 .flags
= AVFMT_SHOW_IDS
|AVFMT_TS_DISCONT
,
1531 AVInputFormat mpegtsraw_demuxer
= {
1533 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1534 sizeof(MpegTSContext
),
1537 mpegts_raw_read_packet
,
1541 .flags
= AVFMT_SHOW_IDS
|AVFMT_TS_DISCONT
,