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"
23 #include "libavutil/intreadwrite.h"
24 #include "libavcodec/bytestream.h"
32 /* 1.0 second at 24Mbit/s */
33 #define MAX_SCAN_PACKETS 32000
35 /* maximum size in which we look for synchronisation if
36 synchronisation is lost */
37 #define MAX_RESYNC_SIZE 4096
38 #define REGISTRATION_DESCRIPTOR 5
40 typedef struct PESContext PESContext
;
42 static PESContext
* add_pes_stream(MpegTSContext
*ts
, int pid
, int pcr_pid
, int stream_type
);
43 static AVStream
* new_pes_av_stream(PESContext
*pes
, uint32_t code
);
45 enum MpegTSFilterType
{
50 typedef struct MpegTSFilter MpegTSFilter
;
52 typedef void 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 */
113 /******************************************/
114 /* private mpegts data */
116 /** structure to keep track of Program->pids mapping */
121 /** filters for various streams specified by PMT + for the PAT and PMT */
122 MpegTSFilter
*pids
[NB_PID_MAX
];
125 /* TS stream handling */
129 MPEGTS_PESHEADER_FILL
,
134 /* enough for PES header + length */
135 #define PES_START_SIZE 9
136 #define MAX_PES_HEADER_SIZE (9 + 255)
140 int pcr_pid
; /**< if -1 then all packets containing PCR are considered */
143 AVFormatContext
*stream
;
145 enum MpegTSState state
;
146 /* used to get the format */
151 int64_t ts_packet_pos
; /**< position of first TS packet of this PES packet */
152 uint8_t header
[MAX_PES_HEADER_SIZE
];
155 extern AVInputFormat mpegts_demuxer
;
157 static void clear_program(MpegTSContext
*ts
, unsigned int programid
)
161 for(i
=0; i
<ts
->nb_prg
; i
++)
162 if(ts
->prg
[i
].id
== programid
)
163 ts
->prg
[i
].nb_pids
= 0;
166 static void clear_programs(MpegTSContext
*ts
)
172 static void add_pat_entry(MpegTSContext
*ts
, unsigned int programid
)
175 void *tmp
= av_realloc(ts
->prg
, (ts
->nb_prg
+1)*sizeof(struct Program
));
179 p
= &ts
->prg
[ts
->nb_prg
];
185 static void add_pid_to_pmt(MpegTSContext
*ts
, unsigned int programid
, unsigned int pid
)
188 struct Program
*p
= NULL
;
189 for(i
=0; i
<ts
->nb_prg
; i
++) {
190 if(ts
->prg
[i
].id
== programid
) {
198 if(p
->nb_pids
>= MAX_PIDS_PER_PROGRAM
)
200 p
->pids
[p
->nb_pids
++] = pid
;
204 * \brief discard_pid() decides if the pid is to be discarded according
205 * to caller's programs selection
206 * \param ts : - TS context
208 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
211 static int discard_pid(MpegTSContext
*ts
, unsigned int pid
)
214 int used
= 0, discarded
= 0;
216 for(i
=0; i
<ts
->nb_prg
; i
++) {
218 for(j
=0; j
<p
->nb_pids
; j
++) {
219 if(p
->pids
[j
] != pid
)
221 //is program with id p->id set to be discarded?
222 for(k
=0; k
<ts
->stream
->nb_programs
; k
++) {
223 if(ts
->stream
->programs
[k
]->id
== p
->id
) {
224 if(ts
->stream
->programs
[k
]->discard
== AVDISCARD_ALL
)
233 return !used
&& discarded
;
237 * Assembles PES packets out of TS packets, and then calls the "section_cb"
238 * function when they are complete.
240 static void write_section_data(AVFormatContext
*s
, MpegTSFilter
*tss1
,
241 const uint8_t *buf
, int buf_size
, int is_start
)
243 MpegTSSectionFilter
*tss
= &tss1
->u
.section_filter
;
247 memcpy(tss
->section_buf
, buf
, buf_size
);
248 tss
->section_index
= buf_size
;
249 tss
->section_h_size
= -1;
250 tss
->end_of_section_reached
= 0;
252 if (tss
->end_of_section_reached
)
254 len
= 4096 - tss
->section_index
;
257 memcpy(tss
->section_buf
+ tss
->section_index
, buf
, len
);
258 tss
->section_index
+= len
;
261 /* compute section length if possible */
262 if (tss
->section_h_size
== -1 && tss
->section_index
>= 3) {
263 len
= (AV_RB16(tss
->section_buf
+ 1) & 0xfff) + 3;
266 tss
->section_h_size
= len
;
269 if (tss
->section_h_size
!= -1 && tss
->section_index
>= tss
->section_h_size
) {
270 tss
->end_of_section_reached
= 1;
271 if (!tss
->check_crc
||
272 av_crc(av_crc_get_table(AV_CRC_32_IEEE
), -1,
273 tss
->section_buf
, tss
->section_h_size
) == 0)
274 tss
->section_cb(tss1
, tss
->section_buf
, tss
->section_h_size
);
278 static MpegTSFilter
*mpegts_open_section_filter(MpegTSContext
*ts
, unsigned int pid
,
279 SectionCallback
*section_cb
, void *opaque
,
283 MpegTSFilter
*filter
;
284 MpegTSSectionFilter
*sec
;
286 dprintf(ts
->stream
, "Filter: pid=0x%x\n", pid
);
288 if (pid
>= NB_PID_MAX
|| ts
->pids
[pid
])
290 filter
= av_mallocz(sizeof(MpegTSFilter
));
293 ts
->pids
[pid
] = filter
;
294 filter
->type
= MPEGTS_SECTION
;
296 filter
->last_cc
= -1;
297 sec
= &filter
->u
.section_filter
;
298 sec
->section_cb
= section_cb
;
299 sec
->opaque
= opaque
;
300 sec
->section_buf
= av_malloc(MAX_SECTION_SIZE
);
301 sec
->check_crc
= check_crc
;
302 if (!sec
->section_buf
) {
309 static MpegTSFilter
*mpegts_open_pes_filter(MpegTSContext
*ts
, unsigned int pid
,
313 MpegTSFilter
*filter
;
314 MpegTSPESFilter
*pes
;
316 if (pid
>= NB_PID_MAX
|| ts
->pids
[pid
])
318 filter
= av_mallocz(sizeof(MpegTSFilter
));
321 ts
->pids
[pid
] = filter
;
322 filter
->type
= MPEGTS_PES
;
324 filter
->last_cc
= -1;
325 pes
= &filter
->u
.pes_filter
;
326 pes
->pes_cb
= pes_cb
;
327 pes
->opaque
= opaque
;
331 static void mpegts_close_filter(MpegTSContext
*ts
, MpegTSFilter
*filter
)
336 if (filter
->type
== MPEGTS_SECTION
)
337 av_freep(&filter
->u
.section_filter
.section_buf
);
338 else if (filter
->type
== MPEGTS_PES
) {
339 /* referenced private data will be freed later in
340 * av_close_input_stream */
341 if (!((PESContext
*)filter
->u
.pes_filter
.opaque
)->st
) {
342 av_freep(&filter
->u
.pes_filter
.opaque
);
347 ts
->pids
[pid
] = NULL
;
350 static int analyze(const uint8_t *buf
, int size
, int packet_size
, int *index
){
351 int stat
[packet_size
];
356 memset(stat
, 0, packet_size
*sizeof(int));
358 for(x
=i
=0; i
<size
-3; i
++){
359 if(buf
[i
] == 0x47 && !(buf
[i
+1] & 0x80) && (buf
[i
+3] & 0x30)){
361 if(stat
[x
] > best_score
){
368 if(x
== packet_size
) x
= 0;
374 /* autodetect fec presence. Must have at least 1024 bytes */
375 static int get_packet_size(const uint8_t *buf
, int size
)
377 int score
, fec_score
, dvhs_score
;
379 if (size
< (TS_FEC_PACKET_SIZE
* 5 + 1))
382 score
= analyze(buf
, size
, TS_PACKET_SIZE
, NULL
);
383 dvhs_score
= analyze(buf
, size
, TS_DVHS_PACKET_SIZE
, NULL
);
384 fec_score
= analyze(buf
, size
, TS_FEC_PACKET_SIZE
, NULL
);
385 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
387 if (score
> fec_score
&& score
> dvhs_score
) return TS_PACKET_SIZE
;
388 else if(dvhs_score
> score
&& dvhs_score
> fec_score
) return TS_DVHS_PACKET_SIZE
;
389 else if(score
< fec_score
&& dvhs_score
< fec_score
) return TS_FEC_PACKET_SIZE
;
393 typedef struct SectionHeader
{
398 uint8_t last_sec_num
;
401 static inline int get8(const uint8_t **pp
, const uint8_t *p_end
)
414 static inline int get16(const uint8_t **pp
, const uint8_t *p_end
)
420 if ((p
+ 1) >= p_end
)
428 /* read and allocate a DVB string preceeded by its length */
429 static char *getstr8(const uint8_t **pp
, const uint8_t *p_end
)
436 len
= get8(&p
, p_end
);
439 if ((p
+ len
) > p_end
)
441 str
= av_malloc(len
+ 1);
451 static int parse_section_header(SectionHeader
*h
,
452 const uint8_t **pp
, const uint8_t *p_end
)
456 val
= get8(pp
, p_end
);
461 val
= get16(pp
, p_end
);
465 val
= get8(pp
, p_end
);
468 h
->version
= (val
>> 1) & 0x1f;
469 val
= get8(pp
, p_end
);
473 val
= get8(pp
, p_end
);
476 h
->last_sec_num
= val
;
481 static void pmt_cb(MpegTSFilter
*filter
, const uint8_t *section
, int section_len
)
483 MpegTSContext
*ts
= filter
->u
.section_filter
.opaque
;
484 SectionHeader h1
, *h
= &h1
;
487 const uint8_t *p
, *p_end
, *desc_list_end
, *desc_end
;
488 int program_info_length
, pcr_pid
, pid
, stream_type
;
489 int desc_list_len
, desc_len
, desc_tag
;
490 int comp_page
= 0, anc_page
= 0; /* initialize to kill warnings */
491 char language
[4] = {0}; /* initialize to kill warnings */
492 int has_hdmv_descr
= 0;
493 int has_dirac_descr
= 0;
494 uint32_t reg_desc
= 0; /* registration descriptor */
497 dprintf(ts
->stream
, "PMT: len %i\n", section_len
);
498 av_hex_dump_log(ts
->stream
, AV_LOG_DEBUG
, (uint8_t *)section
, section_len
);
501 p_end
= section
+ section_len
- 4;
503 if (parse_section_header(h
, &p
, p_end
) < 0)
506 dprintf(ts
->stream
, "sid=0x%x sec_num=%d/%d\n",
507 h
->id
, h
->sec_num
, h
->last_sec_num
);
509 if (h
->tid
!= PMT_TID
)
512 clear_program(ts
, h
->id
);
513 pcr_pid
= get16(&p
, p_end
) & 0x1fff;
516 add_pid_to_pmt(ts
, h
->id
, pcr_pid
);
518 dprintf(ts
->stream
, "pcr_pid=0x%x\n", pcr_pid
);
520 program_info_length
= get16(&p
, p_end
) & 0xfff;
521 if (program_info_length
< 0)
523 while(program_info_length
>= 2) {
525 tag
= get8(&p
, p_end
);
526 len
= get8(&p
, p_end
);
527 if(len
> program_info_length
- 2)
528 //something else is broken, exit the program_descriptors_loop
530 program_info_length
-= len
+ 2;
531 if(tag
== REGISTRATION_DESCRIPTOR
&& len
>= 4) {
532 reg_desc
= bytestream_get_le32(&p
);
534 if(reg_desc
== AV_RL32("HDMV"))
539 p
+= program_info_length
;
545 stream_type
= get8(&p
, p_end
);
548 pid
= get16(&p
, p_end
) & 0x1fff;
551 desc_list_len
= get16(&p
, p_end
) & 0xfff;
552 if (desc_list_len
< 0)
554 desc_list_end
= p
+ desc_list_len
;
555 if (desc_list_end
> p_end
)
558 desc_tag
= get8(&p
, desc_list_end
);
561 if (stream_type
== STREAM_TYPE_PRIVATE_DATA
) {
562 if((desc_tag
== 0x6A) || (desc_tag
== 0x7A)) {
563 /*assume DVB AC-3 Audio*/
564 stream_type
= STREAM_TYPE_AUDIO_AC3
;
565 } else if(desc_tag
== 0x7B) {
567 stream_type
= STREAM_TYPE_AUDIO_DTS
;
570 desc_len
= get8(&p
, desc_list_end
);
573 desc_end
= p
+ desc_len
;
574 if (desc_end
> desc_list_end
)
577 dprintf(ts
->stream
, "tag: 0x%02x len=%d\n",
581 case DVB_SUBT_DESCID
:
582 if (stream_type
== STREAM_TYPE_PRIVATE_DATA
)
583 stream_type
= STREAM_TYPE_SUBTITLE_DVB
;
585 language
[0] = get8(&p
, desc_end
);
586 language
[1] = get8(&p
, desc_end
);
587 language
[2] = get8(&p
, desc_end
);
590 comp_page
= get16(&p
, desc_end
);
591 anc_page
= get16(&p
, desc_end
);
594 case 0x0a: /* ISO 639 language descriptor */
595 language
[0] = get8(&p
, desc_end
);
596 language
[1] = get8(&p
, desc_end
);
597 language
[2] = get8(&p
, desc_end
);
600 case REGISTRATION_DESCRIPTOR
: /*MPEG-2 Registration descriptor */
601 reg_desc
= bytestream_get_le32(&p
);
602 if(reg_desc
== AV_RL32("drac"))
604 else if(reg_desc
== AV_RL32("AC-3"))
605 stream_type
= STREAM_TYPE_AUDIO_AC3
;
614 dprintf(ts
->stream
, "stream_type=%x 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 av_metadata_set(&st
->metadata
, "language", language
);
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 dprintf(ts
->stream
, "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 dprintf(ts
->stream
, "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 sdt_cb(MpegTSFilter
*filter
, const uint8_t *section
, int section_len
)
716 MpegTSContext
*ts
= filter
->u
.section_filter
.opaque
;
717 SectionHeader h1
, *h
= &h1
;
718 const uint8_t *p
, *p_end
, *desc_list_end
, *desc_end
;
719 int onid
, val
, sid
, desc_list_len
, desc_tag
, desc_len
, service_type
;
720 char *name
, *provider_name
;
723 dprintf(ts
->stream
, "SDT:\n");
724 av_hex_dump_log(ts
->stream
, AV_LOG_DEBUG
, (uint8_t *)section
, section_len
);
727 p_end
= section
+ section_len
- 4;
729 if (parse_section_header(h
, &p
, p_end
) < 0)
731 if (h
->tid
!= SDT_TID
)
733 onid
= get16(&p
, p_end
);
736 val
= get8(&p
, p_end
);
740 sid
= get16(&p
, p_end
);
743 val
= get8(&p
, p_end
);
746 desc_list_len
= get16(&p
, p_end
) & 0xfff;
747 if (desc_list_len
< 0)
749 desc_list_end
= p
+ desc_list_len
;
750 if (desc_list_end
> p_end
)
753 desc_tag
= get8(&p
, desc_list_end
);
756 desc_len
= get8(&p
, desc_list_end
);
757 desc_end
= p
+ desc_len
;
758 if (desc_end
> desc_list_end
)
761 dprintf(ts
->stream
, "tag: 0x%02x len=%d\n",
766 service_type
= get8(&p
, p_end
);
767 if (service_type
< 0)
769 provider_name
= getstr8(&p
, p_end
);
772 name
= getstr8(&p
, p_end
);
774 AVProgram
*program
= av_new_program(ts
->stream
, sid
);
776 av_metadata_set(&program
->metadata
, "name", name
);
777 av_metadata_set(&program
->metadata
, "provider_name", provider_name
);
781 av_free(provider_name
);
792 static int64_t get_pts(const uint8_t *p
)
794 int64_t pts
= (int64_t)((p
[0] >> 1) & 0x07) << 30;
795 pts
|= (AV_RB16(p
+ 1) >> 1) << 15;
796 pts
|= AV_RB16(p
+ 3) >> 1;
800 /* return non zero if a packet could be constructed */
801 static void mpegts_push_data(MpegTSFilter
*filter
,
802 const uint8_t *buf
, int buf_size
, int is_start
,
805 PESContext
*pes
= filter
->u
.pes_filter
.opaque
;
806 MpegTSContext
*ts
= pes
->ts
;
814 pes
->state
= MPEGTS_HEADER
;
816 pes
->ts_packet_pos
= pos
;
819 while (buf_size
> 0) {
822 len
= PES_START_SIZE
- pes
->data_index
;
825 memcpy(pes
->header
+ pes
->data_index
, p
, len
);
826 pes
->data_index
+= len
;
829 if (pes
->data_index
== PES_START_SIZE
) {
830 /* we got all the PES or section header. We can now
833 av_hex_dump_log(pes
->stream
, AV_LOG_DEBUG
, pes
->header
, pes
->data_index
);
835 if (pes
->header
[0] == 0x00 && pes
->header
[1] == 0x00 &&
836 pes
->header
[2] == 0x01) {
837 /* it must be an mpeg2 PES stream */
838 code
= pes
->header
[3] | 0x100;
840 !((code
>= 0x1c0 && code
<= 0x1df) ||
841 (code
>= 0x1e0 && code
<= 0x1ef) ||
842 (code
== 0x1bd) || (code
== 0x1fd)))
844 pes
->state
= MPEGTS_PESHEADER_FILL
;
845 pes
->total_size
= AV_RB16(pes
->header
+ 4);
846 /* NOTE: a zero total size means the PES size is
849 pes
->total_size
+= 6;
850 pes
->pes_header_size
= pes
->header
[8] + 9;
852 /* otherwise, it should be a table */
855 pes
->state
= MPEGTS_SKIP
;
860 /**********************************************/
861 /* PES packing parsing */
862 case MPEGTS_PESHEADER_FILL
:
863 len
= pes
->pes_header_size
- pes
->data_index
;
866 memcpy(pes
->header
+ pes
->data_index
, p
, len
);
867 pes
->data_index
+= len
;
870 if (pes
->data_index
== pes
->pes_header_size
) {
874 flags
= pes
->header
[7];
876 pes
->pts
= AV_NOPTS_VALUE
;
877 pes
->dts
= AV_NOPTS_VALUE
;
878 if ((flags
& 0xc0) == 0x80) {
879 pes
->dts
= pes
->pts
= get_pts(r
);
881 } else if ((flags
& 0xc0) == 0xc0) {
882 pes
->pts
= get_pts(r
);
884 pes
->dts
= get_pts(r
);
887 /* we got the full header. We parse it and get the payload */
888 pes
->state
= MPEGTS_PAYLOAD
;
892 if (pes
->total_size
) {
893 len
= pes
->total_size
- pes
->data_index
;
900 AVPacket
*pkt
= ts
->pkt
;
901 if (pes
->st
&& av_new_packet(pkt
, len
) == 0) {
902 memcpy(pkt
->data
, p
, len
);
903 pkt
->stream_index
= pes
->st
->index
;
906 /* store position of first TS packet of this PES packet */
907 pkt
->pos
= pes
->ts_packet_pos
;
908 /* reset pts values */
909 pes
->pts
= AV_NOPTS_VALUE
;
910 pes
->dts
= AV_NOPTS_VALUE
;
924 static AVStream
* new_pes_av_stream(PESContext
*pes
, uint32_t code
)
927 enum CodecID codec_id
;
928 enum CodecType codec_type
;
930 switch(pes
->stream_type
){
931 case STREAM_TYPE_AUDIO_MPEG1
:
932 case STREAM_TYPE_AUDIO_MPEG2
:
933 codec_type
= CODEC_TYPE_AUDIO
;
934 codec_id
= CODEC_ID_MP3
;
936 case STREAM_TYPE_VIDEO_MPEG1
:
937 case STREAM_TYPE_VIDEO_MPEG2
:
938 codec_type
= CODEC_TYPE_VIDEO
;
939 codec_id
= CODEC_ID_MPEG2VIDEO
;
941 case STREAM_TYPE_VIDEO_MPEG4
:
942 codec_type
= CODEC_TYPE_VIDEO
;
943 codec_id
= CODEC_ID_MPEG4
;
945 case STREAM_TYPE_VIDEO_H264
:
946 codec_type
= CODEC_TYPE_VIDEO
;
947 codec_id
= CODEC_ID_H264
;
949 case STREAM_TYPE_VIDEO_VC1
:
950 codec_type
= CODEC_TYPE_VIDEO
;
951 codec_id
= CODEC_ID_VC1
;
953 case STREAM_TYPE_VIDEO_DIRAC
:
954 codec_type
= CODEC_TYPE_VIDEO
;
955 codec_id
= CODEC_ID_DIRAC
;
957 case STREAM_TYPE_AUDIO_AAC
:
958 codec_type
= CODEC_TYPE_AUDIO
;
959 codec_id
= CODEC_ID_AAC
;
961 case STREAM_TYPE_AUDIO_AC3
:
962 codec_type
= CODEC_TYPE_AUDIO
;
963 codec_id
= CODEC_ID_AC3
;
965 case STREAM_TYPE_AUDIO_DTS
:
966 case STREAM_TYPE_AUDIO_HDMV_DTS
:
967 codec_type
= CODEC_TYPE_AUDIO
;
968 codec_id
= CODEC_ID_DTS
;
970 case STREAM_TYPE_SUBTITLE_DVB
:
971 codec_type
= CODEC_TYPE_SUBTITLE
;
972 codec_id
= CODEC_ID_DVB_SUBTITLE
;
975 if (code
>= 0x1c0 && code
<= 0x1df) {
976 codec_type
= CODEC_TYPE_AUDIO
;
977 codec_id
= CODEC_ID_MP2
;
978 } else if (code
== 0x1bd) {
979 codec_type
= CODEC_TYPE_AUDIO
;
980 codec_id
= CODEC_ID_AC3
;
982 codec_type
= CODEC_TYPE_VIDEO
;
983 codec_id
= CODEC_ID_PROBE
;
987 st
= av_new_stream(pes
->stream
, pes
->pid
);
989 av_set_pts_info(st
, 33, 1, 90000);
991 st
->codec
->codec_type
= codec_type
;
992 st
->codec
->codec_id
= codec_id
;
993 st
->need_parsing
= AVSTREAM_PARSE_FULL
;
1000 static PESContext
*add_pes_stream(MpegTSContext
*ts
, int pid
, int pcr_pid
, int stream_type
)
1005 /* if no pid found, then add a pid context */
1006 pes
= av_mallocz(sizeof(PESContext
));
1010 pes
->stream
= ts
->stream
;
1012 pes
->pcr_pid
= pcr_pid
;
1013 pes
->stream_type
= stream_type
;
1014 tss
= mpegts_open_pes_filter(ts
, pid
, mpegts_push_data
, pes
);
1022 /* handle one TS packet */
1023 static void handle_packet(MpegTSContext
*ts
, const uint8_t *packet
)
1025 AVFormatContext
*s
= ts
->stream
;
1027 int len
, pid
, cc
, cc_ok
, afc
, is_start
;
1028 const uint8_t *p
, *p_end
;
1031 pid
= AV_RB16(packet
+ 1) & 0x1fff;
1032 if(pid
&& discard_pid(ts
, pid
))
1034 is_start
= packet
[1] & 0x40;
1035 tss
= ts
->pids
[pid
];
1036 if (ts
->auto_guess
&& tss
== NULL
&& is_start
) {
1037 add_pes_stream(ts
, pid
, -1, 0);
1038 tss
= ts
->pids
[pid
];
1043 /* continuity check (currently not used) */
1044 cc
= (packet
[3] & 0xf);
1045 cc_ok
= (tss
->last_cc
< 0) || ((((tss
->last_cc
+ 1) & 0x0f) == cc
));
1048 /* skip adaptation field */
1049 afc
= (packet
[3] >> 4) & 3;
1051 if (afc
== 0) /* reserved value */
1053 if (afc
== 2) /* adaptation field only */
1056 /* skip adapation field */
1059 /* if past the end of packet, ignore */
1060 p_end
= packet
+ TS_PACKET_SIZE
;
1064 pos
= url_ftell(ts
->stream
->pb
);
1065 ts
->pos47
= pos
% ts
->raw_packet_size
;
1067 if (tss
->type
== MPEGTS_SECTION
) {
1069 /* pointer field present */
1071 if (p
+ len
> p_end
)
1074 /* write remaining section bytes */
1075 write_section_data(s
, tss
,
1077 /* check whether filter has been closed */
1083 write_section_data(s
, tss
,
1088 write_section_data(s
, tss
,
1093 // Note: The position here points actually behind the current packet.
1094 tss
->u
.pes_filter
.pes_cb(tss
,
1095 p
, p_end
- p
, is_start
, pos
- ts
->raw_packet_size
);
1099 /* XXX: try to find a better synchro over several packets (use
1100 get_packet_size() ?) */
1101 static int mpegts_resync(ByteIOContext
*pb
)
1105 for(i
= 0;i
< MAX_RESYNC_SIZE
; i
++) {
1110 url_fseek(pb
, -1, SEEK_CUR
);
1118 /* return -1 if error or EOF. Return 0 if OK. */
1119 static int read_packet(ByteIOContext
*pb
, uint8_t *buf
, int raw_packet_size
)
1124 len
= get_buffer(pb
, buf
, TS_PACKET_SIZE
);
1125 if (len
!= TS_PACKET_SIZE
)
1126 return AVERROR(EIO
);
1127 /* check paquet sync byte */
1128 if (buf
[0] != 0x47) {
1129 /* find a new packet start */
1130 url_fseek(pb
, -TS_PACKET_SIZE
, SEEK_CUR
);
1131 if (mpegts_resync(pb
) < 0)
1132 return AVERROR_INVALIDDATA
;
1136 skip
= raw_packet_size
- TS_PACKET_SIZE
;
1138 url_fskip(pb
, skip
);
1145 static int handle_packets(MpegTSContext
*ts
, int nb_packets
)
1147 AVFormatContext
*s
= ts
->stream
;
1148 ByteIOContext
*pb
= s
->pb
;
1149 uint8_t packet
[TS_PACKET_SIZE
];
1150 int packet_num
, ret
;
1155 if (ts
->stop_parse
>0)
1158 if (nb_packets
!= 0 && packet_num
>= nb_packets
)
1160 ret
= read_packet(pb
, packet
, ts
->raw_packet_size
);
1163 handle_packet(ts
, packet
);
1168 static int mpegts_probe(AVProbeData
*p
)
1171 const int size
= p
->buf_size
;
1172 int score
, fec_score
, dvhs_score
;
1173 int check_count
= size
/ TS_FEC_PACKET_SIZE
;
1174 #define CHECK_COUNT 10
1176 if (check_count
< CHECK_COUNT
)
1179 score
= analyze(p
->buf
, TS_PACKET_SIZE
*check_count
, TS_PACKET_SIZE
, NULL
)*CHECK_COUNT
/check_count
;
1180 dvhs_score
= analyze(p
->buf
, TS_DVHS_PACKET_SIZE
*check_count
, TS_DVHS_PACKET_SIZE
, NULL
)*CHECK_COUNT
/check_count
;
1181 fec_score
= analyze(p
->buf
, TS_FEC_PACKET_SIZE
*check_count
, TS_FEC_PACKET_SIZE
, NULL
)*CHECK_COUNT
/check_count
;
1182 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1184 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1185 if (score
> fec_score
&& score
> dvhs_score
&& score
> 6) return AVPROBE_SCORE_MAX
+ score
- CHECK_COUNT
;
1186 else if(dvhs_score
> score
&& dvhs_score
> fec_score
&& dvhs_score
> 6) return AVPROBE_SCORE_MAX
+ dvhs_score
- CHECK_COUNT
;
1187 else if( fec_score
> 6) return AVPROBE_SCORE_MAX
+ fec_score
- CHECK_COUNT
;
1190 /* only use the extension for safer guess */
1191 if (match_ext(p
->filename
, "ts"))
1192 return AVPROBE_SCORE_MAX
;
1198 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1199 (-1) if not available */
1200 static int parse_pcr(int64_t *ppcr_high
, int *ppcr_low
,
1201 const uint8_t *packet
)
1203 int afc
, len
, flags
;
1207 afc
= (packet
[3] >> 4) & 3;
1217 if (!(flags
& 0x10))
1222 *ppcr_high
= ((int64_t)v
<< 1) | (p
[4] >> 7);
1223 *ppcr_low
= ((p
[4] & 1) << 8) | p
[5];
1227 static int mpegts_read_header(AVFormatContext
*s
,
1228 AVFormatParameters
*ap
)
1230 MpegTSContext
*ts
= s
->priv_data
;
1231 ByteIOContext
*pb
= s
->pb
;
1232 uint8_t buf
[5*1024];
1237 ts
->mpeg2ts_compute_pcr
= ap
->mpeg2ts_compute_pcr
;
1238 if(ap
->mpeg2ts_raw
){
1239 av_log(s
, AV_LOG_ERROR
, "use mpegtsraw_demuxer!\n");
1244 /* read the first 1024 bytes to get packet size */
1245 pos
= url_ftell(pb
);
1246 len
= get_buffer(pb
, buf
, sizeof(buf
));
1247 if (len
!= sizeof(buf
))
1249 ts
->raw_packet_size
= get_packet_size(buf
, sizeof(buf
));
1250 if (ts
->raw_packet_size
<= 0)
1255 if (s
->iformat
== &mpegts_demuxer
) {
1258 /* first do a scaning to get all the services */
1259 url_fseek(pb
, pos
, SEEK_SET
);
1261 mpegts_open_section_filter(ts
, SDT_PID
, sdt_cb
, ts
, 1);
1263 mpegts_open_section_filter(ts
, PAT_PID
, pat_cb
, ts
, 1);
1265 handle_packets(ts
, s
->probesize
);
1266 /* if could not find service, enable auto_guess */
1270 dprintf(ts
->stream
, "tuning done\n");
1272 s
->ctx_flags
|= AVFMTCTX_NOHEADER
;
1275 int pcr_pid
, pid
, nb_packets
, nb_pcrs
, ret
, pcr_l
;
1276 int64_t pcrs
[2], pcr_h
;
1277 int packet_count
[2];
1278 uint8_t packet
[TS_PACKET_SIZE
];
1280 /* only read packets */
1282 st
= av_new_stream(s
, 0);
1285 av_set_pts_info(st
, 60, 1, 27000000);
1286 st
->codec
->codec_type
= CODEC_TYPE_DATA
;
1287 st
->codec
->codec_id
= CODEC_ID_MPEG2TS
;
1289 /* we iterate until we find two PCRs to estimate the bitrate */
1294 ret
= read_packet(s
->pb
, packet
, ts
->raw_packet_size
);
1297 pid
= AV_RB16(packet
+ 1) & 0x1fff;
1298 if ((pcr_pid
== -1 || pcr_pid
== pid
) &&
1299 parse_pcr(&pcr_h
, &pcr_l
, packet
) == 0) {
1301 packet_count
[nb_pcrs
] = nb_packets
;
1302 pcrs
[nb_pcrs
] = pcr_h
* 300 + pcr_l
;
1310 /* NOTE1: the bitrate is computed without the FEC */
1311 /* NOTE2: it is only the bitrate of the start of the stream */
1312 ts
->pcr_incr
= (pcrs
[1] - pcrs
[0]) / (packet_count
[1] - packet_count
[0]);
1313 ts
->cur_pcr
= pcrs
[0] - ts
->pcr_incr
* packet_count
[0];
1314 s
->bit_rate
= (TS_PACKET_SIZE
* 8) * 27e6
/ ts
->pcr_incr
;
1315 st
->codec
->bit_rate
= s
->bit_rate
;
1316 st
->start_time
= ts
->cur_pcr
;
1318 av_log(ts
->stream
, AV_LOG_DEBUG
, "start=%0.3f pcr=%0.3f incr=%d\n",
1319 st
->start_time
/ 1000000.0, pcrs
[0] / 27e6
, ts
->pcr_incr
);
1323 url_fseek(pb
, pos
, SEEK_SET
);
1329 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1331 static int mpegts_raw_read_packet(AVFormatContext
*s
,
1334 MpegTSContext
*ts
= s
->priv_data
;
1336 int64_t pcr_h
, next_pcr_h
, pos
;
1337 int pcr_l
, next_pcr_l
;
1338 uint8_t pcr_buf
[12];
1340 if (av_new_packet(pkt
, TS_PACKET_SIZE
) < 0)
1341 return AVERROR(ENOMEM
);
1342 pkt
->pos
= url_ftell(s
->pb
);
1343 ret
= read_packet(s
->pb
, pkt
->data
, ts
->raw_packet_size
);
1345 av_free_packet(pkt
);
1348 if (ts
->mpeg2ts_compute_pcr
) {
1349 /* compute exact PCR for each packet */
1350 if (parse_pcr(&pcr_h
, &pcr_l
, pkt
->data
) == 0) {
1351 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1352 pos
= url_ftell(s
->pb
);
1353 for(i
= 0; i
< MAX_PACKET_READAHEAD
; i
++) {
1354 url_fseek(s
->pb
, pos
+ i
* ts
->raw_packet_size
, SEEK_SET
);
1355 get_buffer(s
->pb
, pcr_buf
, 12);
1356 if (parse_pcr(&next_pcr_h
, &next_pcr_l
, pcr_buf
) == 0) {
1357 /* XXX: not precise enough */
1358 ts
->pcr_incr
= ((next_pcr_h
- pcr_h
) * 300 + (next_pcr_l
- pcr_l
)) /
1363 url_fseek(s
->pb
, pos
, SEEK_SET
);
1364 /* no next PCR found: we use previous increment */
1365 ts
->cur_pcr
= pcr_h
* 300 + pcr_l
;
1367 pkt
->pts
= ts
->cur_pcr
;
1368 pkt
->duration
= ts
->pcr_incr
;
1369 ts
->cur_pcr
+= ts
->pcr_incr
;
1371 pkt
->stream_index
= 0;
1375 static int mpegts_read_packet(AVFormatContext
*s
,
1378 MpegTSContext
*ts
= s
->priv_data
;
1381 return handle_packets(ts
, 0);
1384 static int mpegts_read_close(AVFormatContext
*s
)
1386 MpegTSContext
*ts
= s
->priv_data
;
1391 for(i
=0;i
<NB_PID_MAX
;i
++)
1392 if (ts
->pids
[i
]) mpegts_close_filter(ts
, ts
->pids
[i
]);
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
];
1403 int pcr_l
, pcr_pid
= ((PESContext
*)s
->streams
[stream_index
]->priv_data
)->pcr_pid
;
1404 const int find_next
= 1;
1405 pos
= ((*ppos
+ ts
->raw_packet_size
- 1 - ts
->pos47
) / ts
->raw_packet_size
) * ts
->raw_packet_size
+ ts
->pos47
;
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 if ((pcr_pid
< 0 || (AV_RB16(buf
+ 1) & 0x1fff) == pcr_pid
) &&
1412 parse_pcr(×tamp
, &pcr_l
, buf
) == 0) {
1415 pos
+= ts
->raw_packet_size
;
1419 pos
-= ts
->raw_packet_size
;
1421 return AV_NOPTS_VALUE
;
1422 url_fseek(s
->pb
, pos
, SEEK_SET
);
1423 if (get_buffer(s
->pb
, buf
, TS_PACKET_SIZE
) != TS_PACKET_SIZE
)
1424 return AV_NOPTS_VALUE
;
1425 if ((pcr_pid
< 0 || (AV_RB16(buf
+ 1) & 0x1fff) == pcr_pid
) &&
1426 parse_pcr(×tamp
, &pcr_l
, buf
) == 0) {
1436 static int read_seek(AVFormatContext
*s
, int stream_index
, int64_t target_ts
, int flags
){
1437 MpegTSContext
*ts
= s
->priv_data
;
1438 uint8_t buf
[TS_PACKET_SIZE
];
1441 if(av_seek_frame_binary(s
, stream_index
, target_ts
, flags
) < 0)
1444 pos
= url_ftell(s
->pb
);
1447 url_fseek(s
->pb
, pos
, SEEK_SET
);
1448 if (get_buffer(s
->pb
, buf
, TS_PACKET_SIZE
) != TS_PACKET_SIZE
)
1450 // pid = AV_RB16(buf + 1) & 0x1fff;
1451 if(buf
[1] & 0x40) break;
1452 pos
+= ts
->raw_packet_size
;
1454 url_fseek(s
->pb
, pos
, SEEK_SET
);
1459 /**************************************************************/
1460 /* parsing functions - called from other demuxers such as RTP */
1462 MpegTSContext
*mpegts_parse_open(AVFormatContext
*s
)
1466 ts
= av_mallocz(sizeof(MpegTSContext
));
1469 /* no stream case, currently used by RTP */
1470 ts
->raw_packet_size
= TS_PACKET_SIZE
;
1476 /* return the consumed length if a packet was output, or -1 if no
1478 int mpegts_parse_packet(MpegTSContext
*ts
, AVPacket
*pkt
,
1479 const uint8_t *buf
, int len
)
1487 if (ts
->stop_parse
>0)
1489 if (len
< TS_PACKET_SIZE
)
1491 if (buf
[0] != 0x47) {
1495 handle_packet(ts
, buf
);
1496 buf
+= TS_PACKET_SIZE
;
1497 len
-= TS_PACKET_SIZE
;
1503 void mpegts_parse_close(MpegTSContext
*ts
)
1507 for(i
=0;i
<NB_PID_MAX
;i
++)
1508 av_free(ts
->pids
[i
]);
1512 AVInputFormat mpegts_demuxer
= {
1514 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1515 sizeof(MpegTSContext
),
1522 .flags
= AVFMT_SHOW_IDS
|AVFMT_TS_DISCONT
,
1525 AVInputFormat mpegtsraw_demuxer
= {
1527 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1528 sizeof(MpegTSContext
),
1531 mpegts_raw_read_packet
,
1535 .flags
= AVFMT_SHOW_IDS
|AVFMT_TS_DISCONT
,