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/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avassert.h"
30 #include "libavcodec/bytestream.h"
31 #include "libavcodec/get_bits.h"
32 #include "libavcodec/opus.h"
36 #include "avio_internal.h"
41 /* maximum size in which we look for synchronisation if
42 * synchronisation is lost */
43 #define MAX_RESYNC_SIZE 65536
45 #define MAX_PES_PAYLOAD 200 * 1024
47 #define MAX_MP4_DESCR_COUNT 16
49 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
51 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
52 (modulus) = (dividend) % (divisor); \
53 (prev_dividend) = (dividend); \
56 enum MpegTSFilterType {
62 typedef struct MpegTSFilter MpegTSFilter;
64 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
65 int is_start, int64_t pos);
67 typedef struct MpegTSPESFilter {
72 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
74 typedef void SetServiceCallback (void *opaque, int ret);
76 typedef struct MpegTSSectionFilter {
80 unsigned int check_crc : 1;
81 unsigned int end_of_section_reached : 1;
82 SectionCallback *section_cb;
84 } MpegTSSectionFilter;
89 int last_cc; /* last cc code (-1 if first packet) */
91 enum MpegTSFilterType type;
93 MpegTSPESFilter pes_filter;
94 MpegTSSectionFilter section_filter;
98 #define MAX_PIDS_PER_PROGRAM 64
100 unsigned int id; // program id/service id
101 unsigned int nb_pids;
102 unsigned int pids[MAX_PIDS_PER_PROGRAM];
104 /** have we found pmt for this program */
108 struct MpegTSContext {
109 const AVClass *class;
111 AVFormatContext *stream;
112 /** raw packet size, including FEC if present */
117 #define SIZE_STAT_THRESHOLD 10
121 /** if true, all pids are analyzed to find streams */
124 /** compute exact PCR for each transport stream packet */
125 int mpeg2ts_compute_pcr;
127 /** fix dvb teletext pts */
128 int fix_teletext_pts;
130 int64_t cur_pcr; /**< used to estimate the exact PCR */
131 int pcr_incr; /**< used to estimate the exact PCR */
133 /* data needed to handle file based ts */
134 /** stop parsing loop */
136 /** packet containing Audio/Video data */
138 /** to detect seek */
148 /******************************************/
149 /* private mpegts data */
151 /** structure to keep track of Program->pids mapping */
155 int8_t crc_validity[NB_PID_MAX];
156 /** filters for various streams specified by PMT + for the PAT and PMT */
157 MpegTSFilter *pids[NB_PID_MAX];
161 #define MPEGTS_OPTIONS \
162 { "resync_size", "Size limit for looking up a new synchronization.", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT, { .i64 = MAX_RESYNC_SIZE}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }
164 static const AVOption options[] = {
166 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
167 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
168 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
169 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
170 {"scan_all_pmts", "Scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_INT,
171 { .i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
172 {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
173 {.i64 = 0}, 0, 1, 0 },
174 {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
175 {.i64 = 0}, 0, 1, 0 },
179 static const AVClass mpegts_class = {
180 .class_name = "mpegts demuxer",
181 .item_name = av_default_item_name,
183 .version = LIBAVUTIL_VERSION_INT,
186 static const AVOption raw_options[] = {
188 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
189 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
190 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
191 { "ts_packetsize", "Output option carrying the raw packet size.",
192 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
194 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
198 static const AVClass mpegtsraw_class = {
199 .class_name = "mpegtsraw demuxer",
200 .item_name = av_default_item_name,
201 .option = raw_options,
202 .version = LIBAVUTIL_VERSION_INT,
205 /* TS stream handling */
210 MPEGTS_PESHEADER_FILL,
215 /* enough for PES header + length */
216 #define PES_START_SIZE 6
217 #define PES_HEADER_SIZE 9
218 #define MAX_PES_HEADER_SIZE (9 + 255)
220 typedef struct PESContext {
222 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
225 AVFormatContext *stream;
227 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
228 enum MpegTSState state;
229 /* used to get the format */
231 int flags; /**< copied to the AVPacket flags */
234 int extended_stream_id;
236 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
237 uint8_t header[MAX_PES_HEADER_SIZE];
242 extern AVInputFormat ff_mpegts_demuxer;
244 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
247 for (i = 0; i < ts->nb_prg; i++) {
248 if (ts->prg[i].id == programid) {
255 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
257 AVProgram *prg = NULL;
260 for (i = 0; i < ts->stream->nb_programs; i++)
261 if (ts->stream->programs[i]->id == programid) {
262 prg = ts->stream->programs[i];
267 prg->nb_stream_indexes = 0;
270 static void clear_program(MpegTSContext *ts, unsigned int programid)
274 clear_avprogram(ts, programid);
275 for (i = 0; i < ts->nb_prg; i++)
276 if (ts->prg[i].id == programid) {
277 ts->prg[i].nb_pids = 0;
278 ts->prg[i].pmt_found = 0;
282 static void clear_programs(MpegTSContext *ts)
288 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
291 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
295 p = &ts->prg[ts->nb_prg];
302 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
305 struct Program *p = get_program(ts, programid);
310 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
313 for (i = 0; i < p->nb_pids; i++)
314 if (p->pids[i] == pid)
317 p->pids[p->nb_pids++] = pid;
320 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
322 struct Program *p = get_program(ts, programid);
329 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
332 for (i = 0; i < s->nb_programs; i++) {
333 if (s->programs[i]->id == programid) {
334 s->programs[i]->pcr_pid = pid;
341 * @brief discard_pid() decides if the pid is to be discarded according
342 * to caller's programs selection
343 * @param ts : - TS context
345 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
348 static int discard_pid(MpegTSContext *ts, unsigned int pid)
351 int used = 0, discarded = 0;
354 /* If none of the programs have .discard=AVDISCARD_ALL then there's
355 * no way we have to discard this packet */
356 for (k = 0; k < ts->stream->nb_programs; k++)
357 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
359 if (k == ts->stream->nb_programs)
362 for (i = 0; i < ts->nb_prg; i++) {
364 for (j = 0; j < p->nb_pids; j++) {
365 if (p->pids[j] != pid)
367 // is program with id p->id set to be discarded?
368 for (k = 0; k < ts->stream->nb_programs; k++) {
369 if (ts->stream->programs[k]->id == p->id) {
370 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
379 return !used && discarded;
383 * Assemble PES packets out of TS packets, and then call the "section_cb"
384 * function when they are complete.
386 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
387 const uint8_t *buf, int buf_size, int is_start)
389 MpegTSSectionFilter *tss = &tss1->u.section_filter;
393 memcpy(tss->section_buf, buf, buf_size);
394 tss->section_index = buf_size;
395 tss->section_h_size = -1;
396 tss->end_of_section_reached = 0;
398 if (tss->end_of_section_reached)
400 len = 4096 - tss->section_index;
403 memcpy(tss->section_buf + tss->section_index, buf, len);
404 tss->section_index += len;
407 /* compute section length if possible */
408 if (tss->section_h_size == -1 && tss->section_index >= 3) {
409 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
412 tss->section_h_size = len;
415 if (tss->section_h_size != -1 &&
416 tss->section_index >= tss->section_h_size) {
418 tss->end_of_section_reached = 1;
420 if (tss->check_crc) {
421 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
423 ts->crc_validity[ tss1->pid ] = 100;
424 }else if (ts->crc_validity[ tss1->pid ] > -10) {
425 ts->crc_validity[ tss1->pid ]--;
430 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
434 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
435 enum MpegTSFilterType type)
437 MpegTSFilter *filter;
439 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
441 if (pid >= NB_PID_MAX || ts->pids[pid])
443 filter = av_mallocz(sizeof(MpegTSFilter));
446 ts->pids[pid] = filter;
451 filter->last_cc = -1;
452 filter->last_pcr= -1;
457 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
459 SectionCallback *section_cb,
463 MpegTSFilter *filter;
464 MpegTSSectionFilter *sec;
466 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
468 sec = &filter->u.section_filter;
469 sec->section_cb = section_cb;
470 sec->opaque = opaque;
471 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
472 sec->check_crc = check_crc;
473 if (!sec->section_buf) {
480 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
484 MpegTSFilter *filter;
485 MpegTSPESFilter *pes;
487 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
490 pes = &filter->u.pes_filter;
491 pes->pes_cb = pes_cb;
492 pes->opaque = opaque;
496 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
498 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
501 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
506 if (filter->type == MPEGTS_SECTION)
507 av_freep(&filter->u.section_filter.section_buf);
508 else if (filter->type == MPEGTS_PES) {
509 PESContext *pes = filter->u.pes_filter.opaque;
510 av_buffer_unref(&pes->buffer);
511 /* referenced private data will be freed later in
512 * avformat_close_input */
513 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
514 av_freep(&filter->u.pes_filter.opaque);
519 ts->pids[pid] = NULL;
522 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
524 int stat[TS_MAX_PACKET_SIZE];
529 memset(stat, 0, packet_size * sizeof(*stat));
531 for (i = 0; i < size - 3; i++) {
532 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
533 int x = i % packet_size;
536 if (stat[x] > best_score) {
537 best_score = stat[x];
544 return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
547 /* autodetect fec presence. Must have at least 1024 bytes */
548 static int get_packet_size(const uint8_t *buf, int size)
550 int score, fec_score, dvhs_score;
552 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
553 return AVERROR_INVALIDDATA;
555 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
556 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
557 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
558 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
559 score, dvhs_score, fec_score);
561 if (score > fec_score && score > dvhs_score)
562 return TS_PACKET_SIZE;
563 else if (dvhs_score > score && dvhs_score > fec_score)
564 return TS_DVHS_PACKET_SIZE;
565 else if (score < fec_score && dvhs_score < fec_score)
566 return TS_FEC_PACKET_SIZE;
568 return AVERROR_INVALIDDATA;
571 typedef struct SectionHeader {
576 uint8_t last_sec_num;
579 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
586 return AVERROR_INVALIDDATA;
592 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
598 if ((p + 1) >= p_end)
599 return AVERROR_INVALIDDATA;
606 /* read and allocate a DVB string preceded by its length */
607 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
614 len = get8(&p, p_end);
617 if ((p + len) > p_end)
619 str = av_malloc(len + 1);
629 static int parse_section_header(SectionHeader *h,
630 const uint8_t **pp, const uint8_t *p_end)
634 val = get8(pp, p_end);
639 val = get16(pp, p_end);
643 val = get8(pp, p_end);
646 h->version = (val >> 1) & 0x1f;
647 val = get8(pp, p_end);
651 val = get8(pp, p_end);
654 h->last_sec_num = val;
659 uint32_t stream_type;
660 enum AVMediaType codec_type;
661 enum AVCodecID codec_id;
664 static const StreamType ISO_types[] = {
665 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
666 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
667 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
668 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
669 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
670 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
671 /* Makito encoder sets stream type 0x11 for AAC,
672 * so auto-detect LOAS/LATM instead of hardcoding it. */
673 #if !CONFIG_LOAS_DEMUXER
674 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
676 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
677 { 0x20, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
678 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
679 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
680 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
681 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
685 static const StreamType HDMV_types[] = {
686 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
687 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
688 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
689 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
690 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
691 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
692 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
693 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
694 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
695 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
700 static const StreamType MISC_types[] = {
701 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
702 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
706 static const StreamType REGD_types[] = {
707 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
708 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
709 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
710 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
711 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
712 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
713 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
714 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
715 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
716 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
720 static const StreamType METADATA_types[] = {
721 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
722 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
726 /* descriptor present */
727 static const StreamType DESC_types[] = {
728 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
729 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
730 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
731 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
732 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
736 static void mpegts_find_stream_type(AVStream *st,
737 uint32_t stream_type,
738 const StreamType *types)
740 if (avcodec_is_open(st->codec)) {
741 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
745 for (; types->stream_type; types++)
746 if (stream_type == types->stream_type) {
747 st->codec->codec_type = types->codec_type;
748 st->codec->codec_id = types->codec_id;
749 st->request_probe = 0;
754 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
755 uint32_t stream_type, uint32_t prog_reg_desc)
757 int old_codec_type = st->codec->codec_type;
758 int old_codec_id = st->codec->codec_id;
760 if (avcodec_is_open(st->codec)) {
761 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
765 avpriv_set_pts_info(st, 33, 1, 90000);
767 st->codec->codec_type = AVMEDIA_TYPE_DATA;
768 st->codec->codec_id = AV_CODEC_ID_NONE;
769 st->need_parsing = AVSTREAM_PARSE_FULL;
771 pes->stream_type = stream_type;
773 av_log(pes->stream, AV_LOG_DEBUG,
774 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
775 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
777 st->codec->codec_tag = pes->stream_type;
779 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
780 if ((prog_reg_desc == AV_RL32("HDMV") ||
781 prog_reg_desc == AV_RL32("HDPR")) &&
782 st->codec->codec_id == AV_CODEC_ID_NONE) {
783 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
784 if (pes->stream_type == 0x83) {
785 // HDMV TrueHD streams also contain an AC3 coded version of the
786 // audio track - add a second stream for this
788 // priv_data cannot be shared between streams
789 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
791 return AVERROR(ENOMEM);
792 memcpy(sub_pes, pes, sizeof(*sub_pes));
794 sub_st = avformat_new_stream(pes->stream, NULL);
797 return AVERROR(ENOMEM);
800 sub_st->id = pes->pid;
801 avpriv_set_pts_info(sub_st, 33, 1, 90000);
802 sub_st->priv_data = sub_pes;
803 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
804 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
805 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
806 sub_pes->sub_st = pes->sub_st = sub_st;
809 if (st->codec->codec_id == AV_CODEC_ID_NONE)
810 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
811 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
812 st->codec->codec_id = old_codec_id;
813 st->codec->codec_type = old_codec_type;
819 static void reset_pes_packet_state(PESContext *pes)
821 pes->pts = AV_NOPTS_VALUE;
822 pes->dts = AV_NOPTS_VALUE;
825 av_buffer_unref(&pes->buffer);
828 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
832 pkt->buf = pes->buffer;
833 pkt->data = pes->buffer->data;
834 pkt->size = pes->data_index;
836 if (pes->total_size != MAX_PES_PAYLOAD &&
837 pes->pes_header_size + pes->data_index != pes->total_size +
839 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
840 pes->flags |= AV_PKT_FLAG_CORRUPT;
842 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
844 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
845 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
846 pkt->stream_index = pes->sub_st->index;
848 pkt->stream_index = pes->st->index;
851 /* store position of first TS packet of this PES packet */
852 pkt->pos = pes->ts_packet_pos;
853 pkt->flags = pes->flags;
856 reset_pes_packet_state(pes);
859 static uint64_t get_ts64(GetBitContext *gb, int bits)
861 if (get_bits_left(gb) < bits)
862 return AV_NOPTS_VALUE;
863 return get_bits64(gb, bits);
866 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
867 const uint8_t *buf, int buf_size)
870 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
871 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
872 int dts_flag = -1, cts_flag = -1;
873 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
874 uint8_t buf_padded[128 + FF_INPUT_BUFFER_PADDING_SIZE];
875 int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - FF_INPUT_BUFFER_PADDING_SIZE);
877 memcpy(buf_padded, buf, buf_padded_size);
879 init_get_bits(&gb, buf_padded, buf_padded_size * 8);
881 if (sl->use_au_start)
882 au_start_flag = get_bits1(&gb);
884 au_end_flag = get_bits1(&gb);
885 if (!sl->use_au_start && !sl->use_au_end)
886 au_start_flag = au_end_flag = 1;
888 ocr_flag = get_bits1(&gb);
890 idle_flag = get_bits1(&gb);
892 padding_flag = get_bits1(&gb);
894 padding_bits = get_bits(&gb, 3);
896 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
897 if (sl->packet_seq_num_len)
898 skip_bits_long(&gb, sl->packet_seq_num_len);
899 if (sl->degr_prior_len)
901 skip_bits(&gb, sl->degr_prior_len);
903 skip_bits_long(&gb, sl->ocr_len);
905 if (sl->use_rand_acc_pt)
907 if (sl->au_seq_num_len > 0)
908 skip_bits_long(&gb, sl->au_seq_num_len);
909 if (sl->use_timestamps) {
910 dts_flag = get_bits1(&gb);
911 cts_flag = get_bits1(&gb);
914 if (sl->inst_bitrate_len)
915 inst_bitrate_flag = get_bits1(&gb);
917 dts = get_ts64(&gb, sl->timestamp_len);
919 cts = get_ts64(&gb, sl->timestamp_len);
921 skip_bits_long(&gb, sl->au_len);
922 if (inst_bitrate_flag)
923 skip_bits_long(&gb, sl->inst_bitrate_len);
926 if (dts != AV_NOPTS_VALUE)
928 if (cts != AV_NOPTS_VALUE)
931 if (sl->timestamp_len && sl->timestamp_res)
932 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
934 return (get_bits_count(&gb) + 7) >> 3;
937 /* return non zero if a packet could be constructed */
938 static int mpegts_push_data(MpegTSFilter *filter,
939 const uint8_t *buf, int buf_size, int is_start,
942 PESContext *pes = filter->u.pes_filter.opaque;
943 MpegTSContext *ts = pes->ts;
951 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
952 new_pes_packet(pes, ts->pkt);
955 reset_pes_packet_state(pes);
957 pes->state = MPEGTS_HEADER;
958 pes->ts_packet_pos = pos;
961 while (buf_size > 0) {
962 switch (pes->state) {
964 len = PES_START_SIZE - pes->data_index;
967 memcpy(pes->header + pes->data_index, p, len);
968 pes->data_index += len;
971 if (pes->data_index == PES_START_SIZE) {
972 /* we got all the PES or section header. We can now
974 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
975 pes->header[2] == 0x01) {
976 /* it must be an mpeg2 PES stream */
977 code = pes->header[3] | 0x100;
978 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
981 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
983 pes->sub_st->discard == AVDISCARD_ALL)) ||
984 code == 0x1be) /* padding_stream */
987 /* stream not present in PMT */
989 if (ts->skip_changes)
992 pes->st = avformat_new_stream(ts->stream, NULL);
994 return AVERROR(ENOMEM);
995 pes->st->id = pes->pid;
996 mpegts_set_stream_info(pes->st, pes, 0, 0);
999 pes->total_size = AV_RB16(pes->header + 4);
1000 /* NOTE: a zero total size means the PES size is
1002 if (!pes->total_size)
1003 pes->total_size = MAX_PES_PAYLOAD;
1005 /* allocate pes buffer */
1006 pes->buffer = av_buffer_alloc(pes->total_size +
1007 FF_INPUT_BUFFER_PADDING_SIZE);
1009 return AVERROR(ENOMEM);
1011 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1012 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1013 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1014 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1015 pes->state = MPEGTS_PESHEADER;
1016 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1017 av_dlog(pes->stream,
1018 "pid=%x stream_type=%x probing\n",
1021 pes->st->request_probe = 1;
1024 pes->state = MPEGTS_PAYLOAD;
1025 pes->data_index = 0;
1028 /* otherwise, it should be a table */
1031 pes->state = MPEGTS_SKIP;
1036 /**********************************************/
1037 /* PES packing parsing */
1038 case MPEGTS_PESHEADER:
1039 len = PES_HEADER_SIZE - pes->data_index;
1041 return AVERROR_INVALIDDATA;
1044 memcpy(pes->header + pes->data_index, p, len);
1045 pes->data_index += len;
1048 if (pes->data_index == PES_HEADER_SIZE) {
1049 pes->pes_header_size = pes->header[8] + 9;
1050 pes->state = MPEGTS_PESHEADER_FILL;
1053 case MPEGTS_PESHEADER_FILL:
1054 len = pes->pes_header_size - pes->data_index;
1056 return AVERROR_INVALIDDATA;
1059 memcpy(pes->header + pes->data_index, p, len);
1060 pes->data_index += len;
1063 if (pes->data_index == pes->pes_header_size) {
1065 unsigned int flags, pes_ext, skip;
1067 flags = pes->header[7];
1068 r = pes->header + 9;
1069 pes->pts = AV_NOPTS_VALUE;
1070 pes->dts = AV_NOPTS_VALUE;
1071 if ((flags & 0xc0) == 0x80) {
1072 pes->dts = pes->pts = ff_parse_pes_pts(r);
1074 } else if ((flags & 0xc0) == 0xc0) {
1075 pes->pts = ff_parse_pes_pts(r);
1077 pes->dts = ff_parse_pes_pts(r);
1080 pes->extended_stream_id = -1;
1081 if (flags & 0x01) { /* PES extension */
1083 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1084 skip = (pes_ext >> 4) & 0xb;
1087 if ((pes_ext & 0x41) == 0x01 &&
1088 (r + 2) <= (pes->header + pes->pes_header_size)) {
1089 /* PES extension 2 */
1090 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1091 pes->extended_stream_id = r[1];
1095 /* we got the full header. We parse it and get the payload */
1096 pes->state = MPEGTS_PAYLOAD;
1097 pes->data_index = 0;
1098 if (pes->stream_type == 0x12 && buf_size > 0) {
1099 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1101 pes->pes_header_size += sl_header_bytes;
1102 p += sl_header_bytes;
1103 buf_size -= sl_header_bytes;
1105 if (pes->stream_type == 0x15 && buf_size >= 5) {
1106 /* skip metadata access unit header */
1107 pes->pes_header_size += 5;
1111 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1112 AVProgram *p = NULL;
1113 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1114 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1115 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1117 AVStream *st = NULL;
1118 if (f->type == MPEGTS_PES) {
1119 PESContext *pcrpes = f->u.pes_filter.opaque;
1122 } else if (f->type == MPEGTS_PCR) {
1124 for (i = 0; i < p->nb_stream_indexes; i++) {
1125 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1126 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1130 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1131 // teletext packets do not always have correct timestamps,
1132 // the standard says they should be handled after 40.6 ms at most,
1133 // and the pcr error to this packet should be no more than 100 ms.
1134 // TODO: we should interpolate the PCR, not just use the last one
1135 int64_t pcr = f->last_pcr / 300;
1136 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1137 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1138 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1139 pes->pts = pes->dts = pcr;
1140 } else if (pes->dts > pcr + 3654 + 9000) {
1141 pes->pts = pes->dts = pcr + 3654 + 9000;
1151 case MPEGTS_PAYLOAD:
1153 if (pes->data_index > 0 &&
1154 pes->data_index + buf_size > pes->total_size) {
1155 new_pes_packet(pes, ts->pkt);
1156 pes->total_size = MAX_PES_PAYLOAD;
1157 pes->buffer = av_buffer_alloc(pes->total_size +
1158 FF_INPUT_BUFFER_PADDING_SIZE);
1160 return AVERROR(ENOMEM);
1162 } else if (pes->data_index == 0 &&
1163 buf_size > pes->total_size) {
1164 // pes packet size is < ts size packet and pes data is padded with 0xff
1165 // not sure if this is legal in ts but see issue #2392
1166 buf_size = pes->total_size;
1168 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1169 pes->data_index += buf_size;
1170 /* emit complete packets with known packet size
1171 * decreases demuxer delay for infrequent packets like subtitles from
1172 * a couple of seconds to milliseconds for properly muxed files.
1173 * total_size is the number of bytes following pes_packet_length
1174 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1175 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1176 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1178 new_pes_packet(pes, ts->pkt);
1192 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1197 /* if no pid found, then add a pid context */
1198 pes = av_mallocz(sizeof(PESContext));
1202 pes->stream = ts->stream;
1204 pes->pcr_pid = pcr_pid;
1205 pes->state = MPEGTS_SKIP;
1206 pes->pts = AV_NOPTS_VALUE;
1207 pes->dts = AV_NOPTS_VALUE;
1208 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1221 Mp4Descr *active_descr;
1223 int max_descr_count;
1225 int predefined_SLConfigDescriptor_seen;
1226 } MP4DescrParseContext;
1228 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1229 const uint8_t *buf, unsigned size,
1230 Mp4Descr *descr, int max_descr_count)
1233 if (size > (1 << 30))
1234 return AVERROR_INVALIDDATA;
1236 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1237 NULL, NULL, NULL, NULL)) < 0)
1244 d->active_descr = NULL;
1245 d->max_descr_count = max_descr_count;
1250 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1252 int64_t new_off = avio_tell(pb);
1253 (*len) -= new_off - *off;
1257 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1260 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1263 int ret = parse_mp4_descr(d, off, len, 0);
1266 update_offsets(&d->pb, &off, &len);
1271 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1273 avio_rb16(&d->pb); // ID
1279 update_offsets(&d->pb, &off, &len);
1280 return parse_mp4_descr_arr(d, off, len);
1283 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1288 id_flags = avio_rb16(&d->pb);
1289 if (!(id_flags & 0x0020)) { // URL_Flag
1290 update_offsets(&d->pb, &off, &len);
1291 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1297 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1300 if (d->descr_count >= d->max_descr_count)
1301 return AVERROR_INVALIDDATA;
1302 ff_mp4_parse_es_descr(&d->pb, &es_id);
1303 d->active_descr = d->descr + (d->descr_count++);
1305 d->active_descr->es_id = es_id;
1306 update_offsets(&d->pb, &off, &len);
1307 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1308 update_offsets(&d->pb, &off, &len);
1310 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1311 d->active_descr = NULL;
1315 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1318 Mp4Descr *descr = d->active_descr;
1320 return AVERROR_INVALIDDATA;
1321 d->active_descr->dec_config_descr = av_malloc(len);
1322 if (!descr->dec_config_descr)
1323 return AVERROR(ENOMEM);
1324 descr->dec_config_descr_len = len;
1325 avio_read(&d->pb, descr->dec_config_descr, len);
1329 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1331 Mp4Descr *descr = d->active_descr;
1334 return AVERROR_INVALIDDATA;
1336 predefined = avio_r8(&d->pb);
1339 int flags = avio_r8(&d->pb);
1340 descr->sl.use_au_start = !!(flags & 0x80);
1341 descr->sl.use_au_end = !!(flags & 0x40);
1342 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1343 descr->sl.use_padding = !!(flags & 0x08);
1344 descr->sl.use_timestamps = !!(flags & 0x04);
1345 descr->sl.use_idle = !!(flags & 0x02);
1346 descr->sl.timestamp_res = avio_rb32(&d->pb);
1348 descr->sl.timestamp_len = avio_r8(&d->pb);
1349 if (descr->sl.timestamp_len > 64) {
1350 avpriv_request_sample(NULL, "timestamp_len > 64");
1351 descr->sl.timestamp_len = 64;
1352 return AVERROR_PATCHWELCOME;
1354 descr->sl.ocr_len = avio_r8(&d->pb);
1355 descr->sl.au_len = avio_r8(&d->pb);
1356 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1357 lengths = avio_rb16(&d->pb);
1358 descr->sl.degr_prior_len = lengths >> 12;
1359 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1360 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1361 } else if (!d->predefined_SLConfigDescriptor_seen){
1362 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1363 d->predefined_SLConfigDescriptor_seen = 1;
1368 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1372 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1373 update_offsets(&d->pb, &off, &len);
1374 if (len < 0 || len1 > len || len1 <= 0) {
1375 av_log(d->s, AV_LOG_ERROR,
1376 "Tag %x length violation new length %d bytes remaining %d\n",
1378 return AVERROR_INVALIDDATA;
1381 if (d->level++ >= MAX_LEVEL) {
1382 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1386 if (target_tag && tag != target_tag) {
1387 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1394 parse_MP4IODescrTag(d, off, len1);
1397 parse_MP4ODescrTag(d, off, len1);
1400 parse_MP4ESDescrTag(d, off, len1);
1402 case MP4DecConfigDescrTag:
1403 parse_MP4DecConfigDescrTag(d, off, len1);
1406 parse_MP4SLDescrTag(d, off, len1);
1413 avio_seek(&d->pb, off + len1, SEEK_SET);
1417 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1418 Mp4Descr *descr, int *descr_count, int max_descr_count)
1420 MP4DescrParseContext d;
1423 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1427 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1429 *descr_count = d.descr_count;
1433 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1434 Mp4Descr *descr, int *descr_count, int max_descr_count)
1436 MP4DescrParseContext d;
1439 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1443 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1445 *descr_count = d.descr_count;
1449 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1452 MpegTSContext *ts = filter->u.section_filter.opaque;
1454 const uint8_t *p, *p_end;
1456 int mp4_descr_count = 0;
1457 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1459 AVFormatContext *s = ts->stream;
1461 p_end = section + section_len - 4;
1463 if (parse_section_header(&h, &p, p_end) < 0)
1465 if (h.tid != M4OD_TID)
1468 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1469 MAX_MP4_DESCR_COUNT);
1471 for (pid = 0; pid < NB_PID_MAX; pid++) {
1474 for (i = 0; i < mp4_descr_count; i++) {
1477 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1479 if (ts->pids[pid]->type != MPEGTS_PES) {
1480 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1483 pes = ts->pids[pid]->u.pes_filter.opaque;
1488 pes->sl = mp4_descr[i].sl;
1490 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1491 mp4_descr[i].dec_config_descr_len, 0,
1492 NULL, NULL, NULL, NULL);
1493 ff_mp4_read_dec_config_descr(s, st, &pb);
1494 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1495 st->codec->extradata_size > 0)
1496 st->need_parsing = 0;
1497 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1498 st->codec->extradata_size > 0)
1499 st->need_parsing = 0;
1501 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1503 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1504 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1505 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1506 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1507 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1508 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1511 for (i = 0; i < mp4_descr_count; i++)
1512 av_free(mp4_descr[i].dec_config_descr);
1515 static const uint8_t opus_coupled_stream_cnt[9] = {
1516 1, 0, 1, 1, 2, 2, 2, 3, 3
1519 static const uint8_t opus_stream_cnt[9] = {
1520 1, 1, 1, 2, 2, 3, 4, 4, 5,
1523 static const uint8_t opus_channel_map[8][8] = {
1531 { 0,6,1,2,3,4,5,7 },
1534 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1535 const uint8_t **pp, const uint8_t *desc_list_end,
1536 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1539 const uint8_t *desc_end;
1540 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1544 desc_tag = get8(pp, desc_list_end);
1546 return AVERROR_INVALIDDATA;
1547 desc_len = get8(pp, desc_list_end);
1549 return AVERROR_INVALIDDATA;
1550 desc_end = *pp + desc_len;
1551 if (desc_end > desc_list_end)
1552 return AVERROR_INVALIDDATA;
1554 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1556 if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1557 stream_type == STREAM_TYPE_PRIVATE_DATA)
1558 mpegts_find_stream_type(st, desc_tag, DESC_types);
1561 case 0x1E: /* SL descriptor */
1562 desc_es_id = get16(pp, desc_end);
1565 if (ts && ts->pids[pid])
1566 ts->pids[pid]->es_id = desc_es_id;
1567 for (i = 0; i < mp4_descr_count; i++)
1568 if (mp4_descr[i].dec_config_descr_len &&
1569 mp4_descr[i].es_id == desc_es_id) {
1571 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1572 mp4_descr[i].dec_config_descr_len, 0,
1573 NULL, NULL, NULL, NULL);
1574 ff_mp4_read_dec_config_descr(fc, st, &pb);
1575 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1576 st->codec->extradata_size > 0)
1577 st->need_parsing = 0;
1578 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1579 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1582 case 0x1F: /* FMC descriptor */
1583 if (get16(pp, desc_end) < 0)
1585 if (mp4_descr_count > 0 &&
1586 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1587 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1589 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1590 mp4_descr->dec_config_descr_len, 0,
1591 NULL, NULL, NULL, NULL);
1592 ff_mp4_read_dec_config_descr(fc, st, &pb);
1593 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1594 st->codec->extradata_size > 0) {
1595 st->request_probe = st->need_parsing = 0;
1596 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1600 case 0x56: /* DVB teletext descriptor */
1602 uint8_t *extradata = NULL;
1603 int language_count = desc_len / 5;
1605 if (desc_len > 0 && desc_len % 5 != 0)
1606 return AVERROR_INVALIDDATA;
1608 if (language_count > 0) {
1609 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1610 if (language_count > sizeof(language) / 4) {
1611 language_count = sizeof(language) / 4;
1614 if (st->codec->extradata == NULL) {
1615 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1616 return AVERROR(ENOMEM);
1620 if (st->codec->extradata_size < language_count * 2)
1621 return AVERROR_INVALIDDATA;
1623 extradata = st->codec->extradata;
1625 for (i = 0; i < language_count; i++) {
1626 language[i * 4 + 0] = get8(pp, desc_end);
1627 language[i * 4 + 1] = get8(pp, desc_end);
1628 language[i * 4 + 2] = get8(pp, desc_end);
1629 language[i * 4 + 3] = ',';
1631 memcpy(extradata, *pp, 2);
1637 language[i * 4 - 1] = 0;
1638 av_dict_set(&st->metadata, "language", language, 0);
1642 case 0x59: /* subtitling descriptor */
1644 /* 8 bytes per DVB subtitle substream data:
1645 * ISO_639_language_code (3 bytes),
1646 * subtitling_type (1 byte),
1647 * composition_page_id (2 bytes),
1648 * ancillary_page_id (2 bytes) */
1649 int language_count = desc_len / 8;
1651 if (desc_len > 0 && desc_len % 8 != 0)
1652 return AVERROR_INVALIDDATA;
1654 if (language_count > 1) {
1655 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1658 if (language_count > 0) {
1661 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1662 if (language_count > sizeof(language) / 4) {
1663 language_count = sizeof(language) / 4;
1666 if (st->codec->extradata == NULL) {
1667 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1668 return AVERROR(ENOMEM);
1672 if (st->codec->extradata_size < language_count * 5)
1673 return AVERROR_INVALIDDATA;
1675 extradata = st->codec->extradata;
1677 for (i = 0; i < language_count; i++) {
1678 language[i * 4 + 0] = get8(pp, desc_end);
1679 language[i * 4 + 1] = get8(pp, desc_end);
1680 language[i * 4 + 2] = get8(pp, desc_end);
1681 language[i * 4 + 3] = ',';
1683 /* hearing impaired subtitles detection using subtitling_type */
1685 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1686 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1687 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1688 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1689 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1690 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1691 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1695 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1696 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1702 language[i * 4 - 1] = 0;
1703 av_dict_set(&st->metadata, "language", language, 0);
1707 case 0x0a: /* ISO 639 language descriptor */
1708 for (i = 0; i + 4 <= desc_len; i += 4) {
1709 language[i + 0] = get8(pp, desc_end);
1710 language[i + 1] = get8(pp, desc_end);
1711 language[i + 2] = get8(pp, desc_end);
1712 language[i + 3] = ',';
1713 switch (get8(pp, desc_end)) {
1715 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1718 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1721 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1725 if (i && language[0]) {
1726 language[i - 1] = 0;
1727 av_dict_set(&st->metadata, "language", language, 0);
1730 case 0x05: /* registration descriptor */
1731 st->codec->codec_tag = bytestream_get_le32(pp);
1732 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1733 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1734 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1736 case 0x52: /* stream identifier descriptor */
1737 st->stream_identifier = 1 + get8(pp, desc_end);
1739 case 0x26: /* metadata descriptor */
1740 if (get16(pp, desc_end) == 0xFFFF)
1742 if (get8(pp, desc_end) == 0xFF) {
1743 st->codec->codec_tag = bytestream_get_le32(pp);
1744 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1745 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1748 case 0x7f: /* DVB extension descriptor */
1749 ext_desc_tag = get8(pp, desc_end);
1750 if (ext_desc_tag < 0)
1751 return AVERROR_INVALIDDATA;
1752 if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1753 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1754 if (!st->codec->extradata) {
1755 st->codec->extradata = av_mallocz(sizeof(opus_default_extradata) +
1756 FF_INPUT_BUFFER_PADDING_SIZE);
1757 if (!st->codec->extradata)
1758 return AVERROR(ENOMEM);
1760 st->codec->extradata_size = sizeof(opus_default_extradata);
1761 memcpy(st->codec->extradata, opus_default_extradata, sizeof(opus_default_extradata));
1763 channel_config_code = get8(pp, desc_end);
1764 if (channel_config_code < 0)
1765 return AVERROR_INVALIDDATA;
1766 if (channel_config_code <= 0x8) {
1767 st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1768 st->codec->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
1769 st->codec->extradata[19] = opus_stream_cnt[channel_config_code];
1770 st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1771 memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1773 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1775 st->need_parsing = AVSTREAM_PARSE_FULL;
1786 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1788 MpegTSContext *ts = filter->u.section_filter.opaque;
1789 SectionHeader h1, *h = &h1;
1792 const uint8_t *p, *p_end, *desc_list_end;
1793 int program_info_length, pcr_pid, pid, stream_type;
1795 uint32_t prog_reg_desc = 0; /* registration descriptor */
1797 int mp4_descr_count = 0;
1798 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1801 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1802 hex_dump_debug(ts->stream, section, section_len);
1804 p_end = section + section_len - 4;
1806 if (parse_section_header(h, &p, p_end) < 0)
1809 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d version=%d\n",
1810 h->id, h->sec_num, h->last_sec_num, h->version);
1812 if (h->tid != PMT_TID)
1814 if (!ts->scan_all_pmts && ts->skip_changes)
1817 if (!ts->skip_clear)
1818 clear_program(ts, h->id);
1820 pcr_pid = get16(&p, p_end);
1824 add_pid_to_pmt(ts, h->id, pcr_pid);
1825 set_pcr_pid(ts->stream, h->id, pcr_pid);
1827 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1829 program_info_length = get16(&p, p_end);
1830 if (program_info_length < 0)
1832 program_info_length &= 0xfff;
1833 while (program_info_length >= 2) {
1835 tag = get8(&p, p_end);
1836 len = get8(&p, p_end);
1838 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1840 if (len > program_info_length - 2)
1841 // something else is broken, exit the program_descriptors_loop
1843 program_info_length -= len + 2;
1844 if (tag == 0x1d) { // IOD descriptor
1845 get8(&p, p_end); // scope
1846 get8(&p, p_end); // label
1848 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1849 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1850 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1851 prog_reg_desc = bytestream_get_le32(&p);
1856 p += program_info_length;
1860 // stop parsing after pmt, we found header
1861 if (!ts->stream->nb_streams)
1864 set_pmt_found(ts, h->id);
1870 stream_type = get8(&p, p_end);
1871 if (stream_type < 0)
1873 pid = get16(&p, p_end);
1877 if (pid == ts->current_pid)
1880 /* now create stream */
1881 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1882 pes = ts->pids[pid]->u.pes_filter.opaque;
1884 pes->st = avformat_new_stream(pes->stream, NULL);
1887 pes->st->id = pes->pid;
1890 } else if (stream_type != 0x13) {
1892 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1893 pes = add_pes_stream(ts, pid, pcr_pid);
1895 st = avformat_new_stream(pes->stream, NULL);
1901 int idx = ff_find_stream_index(ts->stream, pid);
1903 st = ts->stream->streams[idx];
1905 st = avformat_new_stream(ts->stream, NULL);
1909 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1916 if (pes && !pes->stream_type)
1917 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1919 add_pid_to_pmt(ts, h->id, pid);
1921 ff_program_add_stream_index(ts->stream, h->id, st->index);
1923 desc_list_len = get16(&p, p_end);
1924 if (desc_list_len < 0)
1926 desc_list_len &= 0xfff;
1927 desc_list_end = p + desc_list_len;
1928 if (desc_list_end > p_end)
1931 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1932 desc_list_end, mp4_descr,
1933 mp4_descr_count, pid, ts) < 0)
1936 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1937 stream_type == 0x83 && pes->sub_st) {
1938 ff_program_add_stream_index(ts->stream, h->id,
1939 pes->sub_st->index);
1940 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1946 if (!ts->pids[pcr_pid])
1947 mpegts_open_pcr_filter(ts, pcr_pid);
1950 for (i = 0; i < mp4_descr_count; i++)
1951 av_free(mp4_descr[i].dec_config_descr);
1954 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1956 MpegTSContext *ts = filter->u.section_filter.opaque;
1957 SectionHeader h1, *h = &h1;
1958 const uint8_t *p, *p_end;
1962 av_dlog(ts->stream, "PAT:\n");
1963 hex_dump_debug(ts->stream, section, section_len);
1965 p_end = section + section_len - 4;
1967 if (parse_section_header(h, &p, p_end) < 0)
1969 if (h->tid != PAT_TID)
1971 if (ts->skip_changes)
1974 ts->stream->ts_id = h->id;
1978 sid = get16(&p, p_end);
1981 pmt_pid = get16(&p, p_end);
1986 if (pmt_pid == ts->current_pid)
1989 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1991 if (sid == 0x0000) {
1994 MpegTSFilter *fil = ts->pids[pmt_pid];
1995 program = av_new_program(ts->stream, sid);
1997 program->program_num = sid;
1998 program->pmt_pid = pmt_pid;
2001 if ( fil->type != MPEGTS_SECTION
2002 || fil->pid != pmt_pid
2003 || fil->u.section_filter.section_cb != pmt_cb)
2004 mpegts_close_filter(ts, ts->pids[pmt_pid]);
2006 if (!ts->pids[pmt_pid])
2007 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2008 add_pat_entry(ts, sid);
2009 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2010 add_pid_to_pmt(ts, sid, pmt_pid);
2016 for (j=0; j<ts->stream->nb_programs; j++) {
2017 for (i = 0; i < ts->nb_prg; i++)
2018 if (ts->prg[i].id == ts->stream->programs[j]->id)
2020 if (i==ts->nb_prg && !ts->skip_clear)
2021 clear_avprogram(ts, ts->stream->programs[j]->id);
2026 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2028 MpegTSContext *ts = filter->u.section_filter.opaque;
2029 SectionHeader h1, *h = &h1;
2030 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2031 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2032 char *name, *provider_name;
2034 av_dlog(ts->stream, "SDT:\n");
2035 hex_dump_debug(ts->stream, section, section_len);
2037 p_end = section + section_len - 4;
2039 if (parse_section_header(h, &p, p_end) < 0)
2041 if (h->tid != SDT_TID)
2043 if (ts->skip_changes)
2045 onid = get16(&p, p_end);
2048 val = get8(&p, p_end);
2052 sid = get16(&p, p_end);
2055 val = get8(&p, p_end);
2058 desc_list_len = get16(&p, p_end);
2059 if (desc_list_len < 0)
2061 desc_list_len &= 0xfff;
2062 desc_list_end = p + desc_list_len;
2063 if (desc_list_end > p_end)
2066 desc_tag = get8(&p, desc_list_end);
2069 desc_len = get8(&p, desc_list_end);
2070 desc_end = p + desc_len;
2071 if (desc_len < 0 || desc_end > desc_list_end)
2074 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
2075 desc_tag, desc_len);
2079 service_type = get8(&p, p_end);
2080 if (service_type < 0)
2082 provider_name = getstr8(&p, p_end);
2085 name = getstr8(&p, p_end);
2087 AVProgram *program = av_new_program(ts->stream, sid);
2089 av_dict_set(&program->metadata, "service_name", name, 0);
2090 av_dict_set(&program->metadata, "service_provider",
2095 av_free(provider_name);
2106 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2107 const uint8_t *packet);
2109 /* handle one TS packet */
2110 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2113 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2114 has_adaptation, has_payload;
2115 const uint8_t *p, *p_end;
2118 pid = AV_RB16(packet + 1) & 0x1fff;
2119 if (pid && discard_pid(ts, pid))
2121 is_start = packet[1] & 0x40;
2122 tss = ts->pids[pid];
2123 if (ts->auto_guess && !tss && is_start) {
2124 add_pes_stream(ts, pid, -1);
2125 tss = ts->pids[pid];
2129 ts->current_pid = pid;
2131 afc = (packet[3] >> 4) & 3;
2132 if (afc == 0) /* reserved value */
2134 has_adaptation = afc & 2;
2135 has_payload = afc & 1;
2136 is_discontinuity = has_adaptation &&
2137 packet[4] != 0 && /* with length > 0 */
2138 (packet[5] & 0x80); /* and discontinuity indicated */
2140 /* continuity check (currently not used) */
2141 cc = (packet[3] & 0xf);
2142 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2143 cc_ok = pid == 0x1FFF || // null packet PID
2150 av_log(ts->stream, AV_LOG_DEBUG,
2151 "Continuity check failed for pid %d expected %d got %d\n",
2152 pid, expected_cc, cc);
2153 if (tss->type == MPEGTS_PES) {
2154 PESContext *pc = tss->u.pes_filter.opaque;
2155 pc->flags |= AV_PKT_FLAG_CORRUPT;
2160 if (has_adaptation) {
2163 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2164 tss->last_pcr = pcr_h * 300 + pcr_l;
2165 /* skip adaptation field */
2168 /* if past the end of packet, ignore */
2169 p_end = packet + TS_PACKET_SIZE;
2170 if (p >= p_end || !has_payload)
2173 pos = avio_tell(ts->stream->pb);
2175 av_assert0(pos >= TS_PACKET_SIZE);
2176 ts->pos47_full = pos - TS_PACKET_SIZE;
2179 if (tss->type == MPEGTS_SECTION) {
2181 /* pointer field present */
2183 if (p + len > p_end)
2186 /* write remaining section bytes */
2187 write_section_data(ts, tss,
2189 /* check whether filter has been closed */
2195 write_section_data(ts, tss,
2200 write_section_data(ts, tss,
2205 // stop find_stream_info from waiting for more streams
2206 // when all programs have received a PMT
2207 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2209 for (i = 0; i < ts->nb_prg; i++) {
2210 if (!ts->prg[i].pmt_found)
2213 if (i == ts->nb_prg && ts->nb_prg > 0) {
2215 for (i = 0; i < ts->stream->nb_streams; i++) {
2216 AVStream *st = ts->stream->streams[i];
2217 types |= 1<<st->codec->codec_type;
2219 if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2220 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2221 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2228 // Note: The position here points actually behind the current packet.
2229 if (tss->type == MPEGTS_PES) {
2230 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2231 pos - ts->raw_packet_size)) < 0)
2239 static void reanalyze(MpegTSContext *ts) {
2240 AVIOContext *pb = ts->stream->pb;
2241 int64_t pos = avio_tell(pb);
2244 pos -= ts->pos47_full;
2245 if (pos == TS_PACKET_SIZE) {
2246 ts->size_stat[0] ++;
2247 } else if (pos == TS_DVHS_PACKET_SIZE) {
2248 ts->size_stat[1] ++;
2249 } else if (pos == TS_FEC_PACKET_SIZE) {
2250 ts->size_stat[2] ++;
2253 ts->size_stat_count ++;
2254 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2256 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2257 newsize = TS_PACKET_SIZE;
2258 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2259 newsize = TS_DVHS_PACKET_SIZE;
2260 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2261 newsize = TS_FEC_PACKET_SIZE;
2263 if (newsize && newsize != ts->raw_packet_size) {
2264 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2265 ts->raw_packet_size = newsize;
2267 ts->size_stat_count = 0;
2268 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2272 /* XXX: try to find a better synchro over several packets (use
2273 * get_packet_size() ?) */
2274 static int mpegts_resync(AVFormatContext *s)
2276 MpegTSContext *ts = s->priv_data;
2277 AVIOContext *pb = s->pb;
2280 for (i = 0; i < ts->resync_size; i++) {
2285 avio_seek(pb, -1, SEEK_CUR);
2286 reanalyze(s->priv_data);
2290 av_log(s, AV_LOG_ERROR,
2291 "max resync size reached, could not find sync byte\n");
2293 return AVERROR_INVALIDDATA;
2296 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2297 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2298 const uint8_t **data)
2300 AVIOContext *pb = s->pb;
2304 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2305 if (len != TS_PACKET_SIZE)
2306 return len < 0 ? len : AVERROR_EOF;
2307 /* check packet sync byte */
2308 if ((*data)[0] != 0x47) {
2309 /* find a new packet start */
2310 uint64_t pos = avio_tell(pb);
2311 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2313 if (mpegts_resync(s) < 0)
2314 return AVERROR(EAGAIN);
2324 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2326 AVIOContext *pb = s->pb;
2327 int skip = raw_packet_size - TS_PACKET_SIZE;
2329 avio_skip(pb, skip);
2332 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2334 AVFormatContext *s = ts->stream;
2335 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2336 const uint8_t *data;
2340 if (avio_tell(s->pb) != ts->last_pos) {
2342 av_dlog(ts->stream, "Skipping after seek\n");
2343 /* seek detected, flush pes buffer */
2344 for (i = 0; i < NB_PID_MAX; i++) {
2346 if (ts->pids[i]->type == MPEGTS_PES) {
2347 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2348 av_buffer_unref(&pes->buffer);
2349 pes->data_index = 0;
2350 pes->state = MPEGTS_SKIP; /* skip until pes header */
2352 ts->pids[i]->last_cc = -1;
2353 ts->pids[i]->last_pcr = -1;
2360 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2363 if (nb_packets != 0 && packet_num >= nb_packets ||
2364 ts->stop_parse > 1) {
2365 ret = AVERROR(EAGAIN);
2368 if (ts->stop_parse > 0)
2371 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2374 ret = handle_packet(ts, data);
2375 finished_reading_packet(s, ts->raw_packet_size);
2379 ts->last_pos = avio_tell(s->pb);
2383 static int mpegts_probe(AVProbeData *p)
2385 const int size = p->buf_size;
2389 int check_count = size / TS_FEC_PACKET_SIZE;
2390 #define CHECK_COUNT 10
2391 #define CHECK_BLOCK 100
2393 if (check_count < CHECK_COUNT)
2394 return AVERROR_INVALIDDATA;
2396 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2397 int left = FFMIN(check_count - i, CHECK_BLOCK);
2398 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2399 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2400 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2401 score = FFMAX3(score, dvhs_score, fec_score);
2403 maxscore = FFMAX(maxscore, score);
2406 sumscore = sumscore * CHECK_COUNT / check_count;
2407 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2409 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2411 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2412 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2414 return AVERROR_INVALIDDATA;
2417 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2418 * (-1) if not available */
2419 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2421 int afc, len, flags;
2425 afc = (packet[3] >> 4) & 3;
2427 return AVERROR_INVALIDDATA;
2432 return AVERROR_INVALIDDATA;
2435 if (!(flags & 0x10))
2436 return AVERROR_INVALIDDATA;
2438 return AVERROR_INVALIDDATA;
2440 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2441 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2445 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2447 /* NOTE: We attempt to seek on non-seekable files as well, as the
2448 * probe buffer usually is big enough. Only warn if the seek failed
2449 * on files where the seek should work. */
2450 if (avio_seek(pb, pos, SEEK_SET) < 0)
2451 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2454 static int mpegts_read_header(AVFormatContext *s)
2456 MpegTSContext *ts = s->priv_data;
2457 AVIOContext *pb = s->pb;
2458 uint8_t buf[8 * 1024] = {0};
2460 int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2462 if (ffio_ensure_seekback(pb, probesize) < 0)
2463 av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
2465 /* read the first 8192 bytes to get packet size */
2466 pos = avio_tell(pb);
2467 len = avio_read(pb, buf, sizeof(buf));
2468 ts->raw_packet_size = get_packet_size(buf, len);
2469 if (ts->raw_packet_size <= 0) {
2470 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2471 ts->raw_packet_size = TS_PACKET_SIZE;
2476 if (s->iformat == &ff_mpegts_demuxer) {
2479 /* first do a scan to get all the services */
2480 seek_back(s, pb, pos);
2482 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2484 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2486 handle_packets(ts, probesize / ts->raw_packet_size);
2487 /* if could not find service, enable auto_guess */
2491 av_dlog(ts->stream, "tuning done\n");
2493 s->ctx_flags |= AVFMTCTX_NOHEADER;
2496 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2497 int64_t pcrs[2], pcr_h;
2498 int packet_count[2];
2499 uint8_t packet[TS_PACKET_SIZE];
2500 const uint8_t *data;
2502 /* only read packets */
2504 st = avformat_new_stream(s, NULL);
2506 return AVERROR(ENOMEM);
2507 avpriv_set_pts_info(st, 60, 1, 27000000);
2508 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2509 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2511 /* we iterate until we find two PCRs to estimate the bitrate */
2516 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2519 pid = AV_RB16(data + 1) & 0x1fff;
2520 if ((pcr_pid == -1 || pcr_pid == pid) &&
2521 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2522 finished_reading_packet(s, ts->raw_packet_size);
2524 packet_count[nb_pcrs] = nb_packets;
2525 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2530 finished_reading_packet(s, ts->raw_packet_size);
2535 /* NOTE1: the bitrate is computed without the FEC */
2536 /* NOTE2: it is only the bitrate of the start of the stream */
2537 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2538 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2539 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2540 st->codec->bit_rate = s->bit_rate;
2541 st->start_time = ts->cur_pcr;
2542 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2543 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2546 seek_back(s, pb, pos);
2550 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2552 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2554 MpegTSContext *ts = s->priv_data;
2556 int64_t pcr_h, next_pcr_h, pos;
2557 int pcr_l, next_pcr_l;
2558 uint8_t pcr_buf[12];
2559 const uint8_t *data;
2561 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2562 return AVERROR(ENOMEM);
2563 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2564 pkt->pos = avio_tell(s->pb);
2566 av_free_packet(pkt);
2569 if (data != pkt->data)
2570 memcpy(pkt->data, data, ts->raw_packet_size);
2571 finished_reading_packet(s, ts->raw_packet_size);
2572 if (ts->mpeg2ts_compute_pcr) {
2573 /* compute exact PCR for each packet */
2574 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2575 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2576 pos = avio_tell(s->pb);
2577 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2578 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2579 avio_read(s->pb, pcr_buf, 12);
2580 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2581 /* XXX: not precise enough */
2583 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2588 avio_seek(s->pb, pos, SEEK_SET);
2589 /* no next PCR found: we use previous increment */
2590 ts->cur_pcr = pcr_h * 300 + pcr_l;
2592 pkt->pts = ts->cur_pcr;
2593 pkt->duration = ts->pcr_incr;
2594 ts->cur_pcr += ts->pcr_incr;
2596 pkt->stream_index = 0;
2600 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2602 MpegTSContext *ts = s->priv_data;
2607 ret = handle_packets(ts, 0);
2609 av_free_packet(ts->pkt);
2610 /* flush pes data left */
2611 for (i = 0; i < NB_PID_MAX; i++)
2612 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2613 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2614 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2615 new_pes_packet(pes, pkt);
2616 pes->state = MPEGTS_SKIP;
2623 if (!ret && pkt->size < 0)
2624 ret = AVERROR(EINTR);
2628 static void mpegts_free(MpegTSContext *ts)
2634 for (i = 0; i < NB_PID_MAX; i++)
2636 mpegts_close_filter(ts, ts->pids[i]);
2639 static int mpegts_read_close(AVFormatContext *s)
2641 MpegTSContext *ts = s->priv_data;
2646 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2647 int64_t *ppos, int64_t pos_limit)
2649 MpegTSContext *ts = s->priv_data;
2650 int64_t pos, timestamp;
2651 uint8_t buf[TS_PACKET_SIZE];
2652 int pcr_l, pcr_pid =
2653 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2654 int pos47 = ts->pos47_full % ts->raw_packet_size;
2656 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2657 ts->raw_packet_size + pos47;
2658 while(pos < pos_limit) {
2659 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2660 return AV_NOPTS_VALUE;
2661 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2662 return AV_NOPTS_VALUE;
2663 if (buf[0] != 0x47) {
2664 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2665 if (mpegts_resync(s) < 0)
2666 return AV_NOPTS_VALUE;
2667 pos = avio_tell(s->pb);
2670 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2671 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2675 pos += ts->raw_packet_size;
2678 return AV_NOPTS_VALUE;
2681 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2682 int64_t *ppos, int64_t pos_limit)
2684 MpegTSContext *ts = s->priv_data;
2686 int pos47 = ts->pos47_full % ts->raw_packet_size;
2687 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2688 ff_read_frame_flush(s);
2689 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2690 return AV_NOPTS_VALUE;
2691 while(pos < pos_limit) {
2694 av_init_packet(&pkt);
2695 ret = av_read_frame(s, &pkt);
2697 return AV_NOPTS_VALUE;
2698 av_free_packet(&pkt);
2699 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2700 ff_reduce_index(s, pkt.stream_index);
2701 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2702 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2710 return AV_NOPTS_VALUE;
2713 /**************************************************************/
2714 /* parsing functions - called from other demuxers such as RTP */
2716 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
2720 ts = av_mallocz(sizeof(MpegTSContext));
2723 /* no stream case, currently used by RTP */
2724 ts->raw_packet_size = TS_PACKET_SIZE;
2727 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2728 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2733 /* return the consumed length if a packet was output, or -1 if no
2734 * packet is output */
2735 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2736 const uint8_t *buf, int len)
2744 if (len < TS_PACKET_SIZE)
2745 return AVERROR_INVALIDDATA;
2746 if (buf[0] != 0x47) {
2750 handle_packet(ts, buf);
2751 buf += TS_PACKET_SIZE;
2752 len -= TS_PACKET_SIZE;
2753 if (ts->stop_parse == 1)
2760 void avpriv_mpegts_parse_close(MpegTSContext *ts)
2766 AVInputFormat ff_mpegts_demuxer = {
2768 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2769 .priv_data_size = sizeof(MpegTSContext),
2770 .read_probe = mpegts_probe,
2771 .read_header = mpegts_read_header,
2772 .read_packet = mpegts_read_packet,
2773 .read_close = mpegts_read_close,
2774 .read_timestamp = mpegts_get_dts,
2775 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2776 .priv_class = &mpegts_class,
2779 AVInputFormat ff_mpegtsraw_demuxer = {
2780 .name = "mpegtsraw",
2781 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2782 .priv_data_size = sizeof(MpegTSContext),
2783 .read_header = mpegts_read_header,
2784 .read_packet = mpegts_raw_read_packet,
2785 .read_close = mpegts_read_close,
2786 .read_timestamp = mpegts_get_dts,
2787 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2788 .priv_class = &mpegtsraw_class,