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 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
678 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
679 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
680 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
684 static const StreamType HDMV_types[] = {
685 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
686 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
687 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
688 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
689 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
690 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
691 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
692 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
693 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
694 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
699 static const StreamType MISC_types[] = {
700 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
701 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
705 static const StreamType REGD_types[] = {
706 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
707 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
708 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
709 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
710 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
711 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
712 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
713 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
714 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
715 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
719 static const StreamType METADATA_types[] = {
720 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
721 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
725 /* descriptor present */
726 static const StreamType DESC_types[] = {
727 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
728 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
729 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
730 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
731 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
735 static void mpegts_find_stream_type(AVStream *st,
736 uint32_t stream_type,
737 const StreamType *types)
739 if (avcodec_is_open(st->codec)) {
740 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
744 for (; types->stream_type; types++)
745 if (stream_type == types->stream_type) {
746 st->codec->codec_type = types->codec_type;
747 st->codec->codec_id = types->codec_id;
748 st->request_probe = 0;
753 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
754 uint32_t stream_type, uint32_t prog_reg_desc)
756 int old_codec_type = st->codec->codec_type;
757 int old_codec_id = st->codec->codec_id;
759 if (avcodec_is_open(st->codec)) {
760 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
764 avpriv_set_pts_info(st, 33, 1, 90000);
766 st->codec->codec_type = AVMEDIA_TYPE_DATA;
767 st->codec->codec_id = AV_CODEC_ID_NONE;
768 st->need_parsing = AVSTREAM_PARSE_FULL;
770 pes->stream_type = stream_type;
772 av_log(pes->stream, AV_LOG_DEBUG,
773 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
774 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
776 st->codec->codec_tag = pes->stream_type;
778 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
779 if ((prog_reg_desc == AV_RL32("HDMV") ||
780 prog_reg_desc == AV_RL32("HDPR")) &&
781 st->codec->codec_id == AV_CODEC_ID_NONE) {
782 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
783 if (pes->stream_type == 0x83) {
784 // HDMV TrueHD streams also contain an AC3 coded version of the
785 // audio track - add a second stream for this
787 // priv_data cannot be shared between streams
788 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
790 return AVERROR(ENOMEM);
791 memcpy(sub_pes, pes, sizeof(*sub_pes));
793 sub_st = avformat_new_stream(pes->stream, NULL);
796 return AVERROR(ENOMEM);
799 sub_st->id = pes->pid;
800 avpriv_set_pts_info(sub_st, 33, 1, 90000);
801 sub_st->priv_data = sub_pes;
802 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
803 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
804 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
805 sub_pes->sub_st = pes->sub_st = sub_st;
808 if (st->codec->codec_id == AV_CODEC_ID_NONE)
809 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
810 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
811 st->codec->codec_id = old_codec_id;
812 st->codec->codec_type = old_codec_type;
818 static void reset_pes_packet_state(PESContext *pes)
820 pes->pts = AV_NOPTS_VALUE;
821 pes->dts = AV_NOPTS_VALUE;
824 av_buffer_unref(&pes->buffer);
827 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
831 pkt->buf = pes->buffer;
832 pkt->data = pes->buffer->data;
833 pkt->size = pes->data_index;
835 if (pes->total_size != MAX_PES_PAYLOAD &&
836 pes->pes_header_size + pes->data_index != pes->total_size +
838 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
839 pes->flags |= AV_PKT_FLAG_CORRUPT;
841 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
843 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
844 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
845 pkt->stream_index = pes->sub_st->index;
847 pkt->stream_index = pes->st->index;
850 /* store position of first TS packet of this PES packet */
851 pkt->pos = pes->ts_packet_pos;
852 pkt->flags = pes->flags;
855 reset_pes_packet_state(pes);
858 static uint64_t get_ts64(GetBitContext *gb, int bits)
860 if (get_bits_left(gb) < bits)
861 return AV_NOPTS_VALUE;
862 return get_bits64(gb, bits);
865 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
866 const uint8_t *buf, int buf_size)
869 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
870 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
871 int dts_flag = -1, cts_flag = -1;
872 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
873 uint8_t buf_padded[128 + FF_INPUT_BUFFER_PADDING_SIZE];
874 int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - FF_INPUT_BUFFER_PADDING_SIZE);
876 memcpy(buf_padded, buf, buf_padded_size);
878 init_get_bits(&gb, buf_padded, buf_padded_size * 8);
880 if (sl->use_au_start)
881 au_start_flag = get_bits1(&gb);
883 au_end_flag = get_bits1(&gb);
884 if (!sl->use_au_start && !sl->use_au_end)
885 au_start_flag = au_end_flag = 1;
887 ocr_flag = get_bits1(&gb);
889 idle_flag = get_bits1(&gb);
891 padding_flag = get_bits1(&gb);
893 padding_bits = get_bits(&gb, 3);
895 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
896 if (sl->packet_seq_num_len)
897 skip_bits_long(&gb, sl->packet_seq_num_len);
898 if (sl->degr_prior_len)
900 skip_bits(&gb, sl->degr_prior_len);
902 skip_bits_long(&gb, sl->ocr_len);
904 if (sl->use_rand_acc_pt)
906 if (sl->au_seq_num_len > 0)
907 skip_bits_long(&gb, sl->au_seq_num_len);
908 if (sl->use_timestamps) {
909 dts_flag = get_bits1(&gb);
910 cts_flag = get_bits1(&gb);
913 if (sl->inst_bitrate_len)
914 inst_bitrate_flag = get_bits1(&gb);
916 dts = get_ts64(&gb, sl->timestamp_len);
918 cts = get_ts64(&gb, sl->timestamp_len);
920 skip_bits_long(&gb, sl->au_len);
921 if (inst_bitrate_flag)
922 skip_bits_long(&gb, sl->inst_bitrate_len);
925 if (dts != AV_NOPTS_VALUE)
927 if (cts != AV_NOPTS_VALUE)
930 if (sl->timestamp_len && sl->timestamp_res)
931 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
933 return (get_bits_count(&gb) + 7) >> 3;
936 /* return non zero if a packet could be constructed */
937 static int mpegts_push_data(MpegTSFilter *filter,
938 const uint8_t *buf, int buf_size, int is_start,
941 PESContext *pes = filter->u.pes_filter.opaque;
942 MpegTSContext *ts = pes->ts;
950 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
951 new_pes_packet(pes, ts->pkt);
954 reset_pes_packet_state(pes);
956 pes->state = MPEGTS_HEADER;
957 pes->ts_packet_pos = pos;
960 while (buf_size > 0) {
961 switch (pes->state) {
963 len = PES_START_SIZE - pes->data_index;
966 memcpy(pes->header + pes->data_index, p, len);
967 pes->data_index += len;
970 if (pes->data_index == PES_START_SIZE) {
971 /* we got all the PES or section header. We can now
973 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
974 pes->header[2] == 0x01) {
975 /* it must be an mpeg2 PES stream */
976 code = pes->header[3] | 0x100;
977 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
980 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
982 pes->sub_st->discard == AVDISCARD_ALL)) ||
983 code == 0x1be) /* padding_stream */
986 /* stream not present in PMT */
988 if (ts->skip_changes)
991 pes->st = avformat_new_stream(ts->stream, NULL);
993 return AVERROR(ENOMEM);
994 pes->st->id = pes->pid;
995 mpegts_set_stream_info(pes->st, pes, 0, 0);
998 pes->total_size = AV_RB16(pes->header + 4);
999 /* NOTE: a zero total size means the PES size is
1001 if (!pes->total_size)
1002 pes->total_size = MAX_PES_PAYLOAD;
1004 /* allocate pes buffer */
1005 pes->buffer = av_buffer_alloc(pes->total_size +
1006 FF_INPUT_BUFFER_PADDING_SIZE);
1008 return AVERROR(ENOMEM);
1010 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1011 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1012 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1013 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1014 pes->state = MPEGTS_PESHEADER;
1015 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1016 av_dlog(pes->stream,
1017 "pid=%x stream_type=%x probing\n",
1020 pes->st->request_probe = 1;
1023 pes->state = MPEGTS_PAYLOAD;
1024 pes->data_index = 0;
1027 /* otherwise, it should be a table */
1030 pes->state = MPEGTS_SKIP;
1035 /**********************************************/
1036 /* PES packing parsing */
1037 case MPEGTS_PESHEADER:
1038 len = PES_HEADER_SIZE - pes->data_index;
1040 return AVERROR_INVALIDDATA;
1043 memcpy(pes->header + pes->data_index, p, len);
1044 pes->data_index += len;
1047 if (pes->data_index == PES_HEADER_SIZE) {
1048 pes->pes_header_size = pes->header[8] + 9;
1049 pes->state = MPEGTS_PESHEADER_FILL;
1052 case MPEGTS_PESHEADER_FILL:
1053 len = pes->pes_header_size - pes->data_index;
1055 return AVERROR_INVALIDDATA;
1058 memcpy(pes->header + pes->data_index, p, len);
1059 pes->data_index += len;
1062 if (pes->data_index == pes->pes_header_size) {
1064 unsigned int flags, pes_ext, skip;
1066 flags = pes->header[7];
1067 r = pes->header + 9;
1068 pes->pts = AV_NOPTS_VALUE;
1069 pes->dts = AV_NOPTS_VALUE;
1070 if ((flags & 0xc0) == 0x80) {
1071 pes->dts = pes->pts = ff_parse_pes_pts(r);
1073 } else if ((flags & 0xc0) == 0xc0) {
1074 pes->pts = ff_parse_pes_pts(r);
1076 pes->dts = ff_parse_pes_pts(r);
1079 pes->extended_stream_id = -1;
1080 if (flags & 0x01) { /* PES extension */
1082 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1083 skip = (pes_ext >> 4) & 0xb;
1086 if ((pes_ext & 0x41) == 0x01 &&
1087 (r + 2) <= (pes->header + pes->pes_header_size)) {
1088 /* PES extension 2 */
1089 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1090 pes->extended_stream_id = r[1];
1094 /* we got the full header. We parse it and get the payload */
1095 pes->state = MPEGTS_PAYLOAD;
1096 pes->data_index = 0;
1097 if (pes->stream_type == 0x12 && buf_size > 0) {
1098 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1100 pes->pes_header_size += sl_header_bytes;
1101 p += sl_header_bytes;
1102 buf_size -= sl_header_bytes;
1104 if (pes->stream_type == 0x15 && buf_size >= 5) {
1105 /* skip metadata access unit header */
1106 pes->pes_header_size += 5;
1110 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1111 AVProgram *p = NULL;
1112 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1113 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1114 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1116 AVStream *st = NULL;
1117 if (f->type == MPEGTS_PES) {
1118 PESContext *pcrpes = f->u.pes_filter.opaque;
1121 } else if (f->type == MPEGTS_PCR) {
1123 for (i = 0; i < p->nb_stream_indexes; i++) {
1124 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1125 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1129 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1130 // teletext packets do not always have correct timestamps,
1131 // the standard says they should be handled after 40.6 ms at most,
1132 // and the pcr error to this packet should be no more than 100 ms.
1133 // TODO: we should interpolate the PCR, not just use the last one
1134 int64_t pcr = f->last_pcr / 300;
1135 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1136 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1137 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1138 pes->pts = pes->dts = pcr;
1139 } else if (pes->dts > pcr + 3654 + 9000) {
1140 pes->pts = pes->dts = pcr + 3654 + 9000;
1150 case MPEGTS_PAYLOAD:
1152 if (pes->data_index > 0 &&
1153 pes->data_index + buf_size > pes->total_size) {
1154 new_pes_packet(pes, ts->pkt);
1155 pes->total_size = MAX_PES_PAYLOAD;
1156 pes->buffer = av_buffer_alloc(pes->total_size +
1157 FF_INPUT_BUFFER_PADDING_SIZE);
1159 return AVERROR(ENOMEM);
1161 } else if (pes->data_index == 0 &&
1162 buf_size > pes->total_size) {
1163 // pes packet size is < ts size packet and pes data is padded with 0xff
1164 // not sure if this is legal in ts but see issue #2392
1165 buf_size = pes->total_size;
1167 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1168 pes->data_index += buf_size;
1169 /* emit complete packets with known packet size
1170 * decreases demuxer delay for infrequent packets like subtitles from
1171 * a couple of seconds to milliseconds for properly muxed files.
1172 * total_size is the number of bytes following pes_packet_length
1173 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1174 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1175 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1177 new_pes_packet(pes, ts->pkt);
1191 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1196 /* if no pid found, then add a pid context */
1197 pes = av_mallocz(sizeof(PESContext));
1201 pes->stream = ts->stream;
1203 pes->pcr_pid = pcr_pid;
1204 pes->state = MPEGTS_SKIP;
1205 pes->pts = AV_NOPTS_VALUE;
1206 pes->dts = AV_NOPTS_VALUE;
1207 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1220 Mp4Descr *active_descr;
1222 int max_descr_count;
1224 int predefined_SLConfigDescriptor_seen;
1225 } MP4DescrParseContext;
1227 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1228 const uint8_t *buf, unsigned size,
1229 Mp4Descr *descr, int max_descr_count)
1232 if (size > (1 << 30))
1233 return AVERROR_INVALIDDATA;
1235 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1236 NULL, NULL, NULL, NULL)) < 0)
1243 d->active_descr = NULL;
1244 d->max_descr_count = max_descr_count;
1249 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1251 int64_t new_off = avio_tell(pb);
1252 (*len) -= new_off - *off;
1256 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1259 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1262 int ret = parse_mp4_descr(d, off, len, 0);
1265 update_offsets(&d->pb, &off, &len);
1270 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1272 avio_rb16(&d->pb); // ID
1278 update_offsets(&d->pb, &off, &len);
1279 return parse_mp4_descr_arr(d, off, len);
1282 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1287 id_flags = avio_rb16(&d->pb);
1288 if (!(id_flags & 0x0020)) { // URL_Flag
1289 update_offsets(&d->pb, &off, &len);
1290 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1296 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1299 if (d->descr_count >= d->max_descr_count)
1300 return AVERROR_INVALIDDATA;
1301 ff_mp4_parse_es_descr(&d->pb, &es_id);
1302 d->active_descr = d->descr + (d->descr_count++);
1304 d->active_descr->es_id = es_id;
1305 update_offsets(&d->pb, &off, &len);
1306 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1307 update_offsets(&d->pb, &off, &len);
1309 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1310 d->active_descr = NULL;
1314 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1317 Mp4Descr *descr = d->active_descr;
1319 return AVERROR_INVALIDDATA;
1320 d->active_descr->dec_config_descr = av_malloc(len);
1321 if (!descr->dec_config_descr)
1322 return AVERROR(ENOMEM);
1323 descr->dec_config_descr_len = len;
1324 avio_read(&d->pb, descr->dec_config_descr, len);
1328 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1330 Mp4Descr *descr = d->active_descr;
1333 return AVERROR_INVALIDDATA;
1335 predefined = avio_r8(&d->pb);
1338 int flags = avio_r8(&d->pb);
1339 descr->sl.use_au_start = !!(flags & 0x80);
1340 descr->sl.use_au_end = !!(flags & 0x40);
1341 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1342 descr->sl.use_padding = !!(flags & 0x08);
1343 descr->sl.use_timestamps = !!(flags & 0x04);
1344 descr->sl.use_idle = !!(flags & 0x02);
1345 descr->sl.timestamp_res = avio_rb32(&d->pb);
1347 descr->sl.timestamp_len = avio_r8(&d->pb);
1348 if (descr->sl.timestamp_len > 64) {
1349 avpriv_request_sample(NULL, "timestamp_len > 64");
1350 descr->sl.timestamp_len = 64;
1351 return AVERROR_PATCHWELCOME;
1353 descr->sl.ocr_len = avio_r8(&d->pb);
1354 descr->sl.au_len = avio_r8(&d->pb);
1355 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1356 lengths = avio_rb16(&d->pb);
1357 descr->sl.degr_prior_len = lengths >> 12;
1358 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1359 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1360 } else if (!d->predefined_SLConfigDescriptor_seen){
1361 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1362 d->predefined_SLConfigDescriptor_seen = 1;
1367 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1371 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1372 update_offsets(&d->pb, &off, &len);
1373 if (len < 0 || len1 > len || len1 <= 0) {
1374 av_log(d->s, AV_LOG_ERROR,
1375 "Tag %x length violation new length %d bytes remaining %d\n",
1377 return AVERROR_INVALIDDATA;
1380 if (d->level++ >= MAX_LEVEL) {
1381 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1385 if (target_tag && tag != target_tag) {
1386 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1393 parse_MP4IODescrTag(d, off, len1);
1396 parse_MP4ODescrTag(d, off, len1);
1399 parse_MP4ESDescrTag(d, off, len1);
1401 case MP4DecConfigDescrTag:
1402 parse_MP4DecConfigDescrTag(d, off, len1);
1405 parse_MP4SLDescrTag(d, off, len1);
1412 avio_seek(&d->pb, off + len1, SEEK_SET);
1416 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1417 Mp4Descr *descr, int *descr_count, int max_descr_count)
1419 MP4DescrParseContext d;
1422 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1426 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1428 *descr_count = d.descr_count;
1432 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1433 Mp4Descr *descr, int *descr_count, int max_descr_count)
1435 MP4DescrParseContext d;
1438 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1442 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1444 *descr_count = d.descr_count;
1448 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1451 MpegTSContext *ts = filter->u.section_filter.opaque;
1453 const uint8_t *p, *p_end;
1455 int mp4_descr_count = 0;
1456 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1458 AVFormatContext *s = ts->stream;
1460 p_end = section + section_len - 4;
1462 if (parse_section_header(&h, &p, p_end) < 0)
1464 if (h.tid != M4OD_TID)
1467 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1468 MAX_MP4_DESCR_COUNT);
1470 for (pid = 0; pid < NB_PID_MAX; pid++) {
1473 for (i = 0; i < mp4_descr_count; i++) {
1476 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1478 if (ts->pids[pid]->type != MPEGTS_PES) {
1479 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1482 pes = ts->pids[pid]->u.pes_filter.opaque;
1487 pes->sl = mp4_descr[i].sl;
1489 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1490 mp4_descr[i].dec_config_descr_len, 0,
1491 NULL, NULL, NULL, NULL);
1492 ff_mp4_read_dec_config_descr(s, st, &pb);
1493 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1494 st->codec->extradata_size > 0)
1495 st->need_parsing = 0;
1496 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1497 st->codec->extradata_size > 0)
1498 st->need_parsing = 0;
1500 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1502 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1503 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1504 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1505 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1506 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1507 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1510 for (i = 0; i < mp4_descr_count; i++)
1511 av_free(mp4_descr[i].dec_config_descr);
1514 static const uint8_t opus_coupled_stream_cnt[9] = {
1515 1, 0, 1, 1, 2, 2, 2, 3, 3
1518 static const uint8_t opus_stream_cnt[9] = {
1519 1, 1, 1, 2, 2, 3, 4, 4, 5,
1522 static const uint8_t opus_channel_map[8][8] = {
1530 { 0,6,1,2,3,4,5,7 },
1533 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1534 const uint8_t **pp, const uint8_t *desc_list_end,
1535 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1538 const uint8_t *desc_end;
1539 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1543 desc_tag = get8(pp, desc_list_end);
1545 return AVERROR_INVALIDDATA;
1546 desc_len = get8(pp, desc_list_end);
1548 return AVERROR_INVALIDDATA;
1549 desc_end = *pp + desc_len;
1550 if (desc_end > desc_list_end)
1551 return AVERROR_INVALIDDATA;
1553 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1555 if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1556 stream_type == STREAM_TYPE_PRIVATE_DATA)
1557 mpegts_find_stream_type(st, desc_tag, DESC_types);
1560 case 0x1E: /* SL descriptor */
1561 desc_es_id = get16(pp, desc_end);
1564 if (ts && ts->pids[pid])
1565 ts->pids[pid]->es_id = desc_es_id;
1566 for (i = 0; i < mp4_descr_count; i++)
1567 if (mp4_descr[i].dec_config_descr_len &&
1568 mp4_descr[i].es_id == desc_es_id) {
1570 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1571 mp4_descr[i].dec_config_descr_len, 0,
1572 NULL, NULL, NULL, NULL);
1573 ff_mp4_read_dec_config_descr(fc, st, &pb);
1574 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1575 st->codec->extradata_size > 0)
1576 st->need_parsing = 0;
1577 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1578 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1581 case 0x1F: /* FMC descriptor */
1582 if (get16(pp, desc_end) < 0)
1584 if (mp4_descr_count > 0 &&
1585 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1586 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1588 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1589 mp4_descr->dec_config_descr_len, 0,
1590 NULL, NULL, NULL, NULL);
1591 ff_mp4_read_dec_config_descr(fc, st, &pb);
1592 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1593 st->codec->extradata_size > 0) {
1594 st->request_probe = st->need_parsing = 0;
1595 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1599 case 0x56: /* DVB teletext descriptor */
1601 uint8_t *extradata = NULL;
1602 int language_count = desc_len / 5;
1604 if (desc_len > 0 && desc_len % 5 != 0)
1605 return AVERROR_INVALIDDATA;
1607 if (language_count > 0) {
1608 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1609 if (language_count > sizeof(language) / 4) {
1610 language_count = sizeof(language) / 4;
1613 if (st->codec->extradata == NULL) {
1614 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1615 return AVERROR(ENOMEM);
1619 if (st->codec->extradata_size < language_count * 2)
1620 return AVERROR_INVALIDDATA;
1622 extradata = st->codec->extradata;
1624 for (i = 0; i < language_count; i++) {
1625 language[i * 4 + 0] = get8(pp, desc_end);
1626 language[i * 4 + 1] = get8(pp, desc_end);
1627 language[i * 4 + 2] = get8(pp, desc_end);
1628 language[i * 4 + 3] = ',';
1630 memcpy(extradata, *pp, 2);
1636 language[i * 4 - 1] = 0;
1637 av_dict_set(&st->metadata, "language", language, 0);
1641 case 0x59: /* subtitling descriptor */
1643 /* 8 bytes per DVB subtitle substream data:
1644 * ISO_639_language_code (3 bytes),
1645 * subtitling_type (1 byte),
1646 * composition_page_id (2 bytes),
1647 * ancillary_page_id (2 bytes) */
1648 int language_count = desc_len / 8;
1650 if (desc_len > 0 && desc_len % 8 != 0)
1651 return AVERROR_INVALIDDATA;
1653 if (language_count > 1) {
1654 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1657 if (language_count > 0) {
1660 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1661 if (language_count > sizeof(language) / 4) {
1662 language_count = sizeof(language) / 4;
1665 if (st->codec->extradata == NULL) {
1666 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1667 return AVERROR(ENOMEM);
1671 if (st->codec->extradata_size < language_count * 5)
1672 return AVERROR_INVALIDDATA;
1674 extradata = st->codec->extradata;
1676 for (i = 0; i < language_count; i++) {
1677 language[i * 4 + 0] = get8(pp, desc_end);
1678 language[i * 4 + 1] = get8(pp, desc_end);
1679 language[i * 4 + 2] = get8(pp, desc_end);
1680 language[i * 4 + 3] = ',';
1682 /* hearing impaired subtitles detection using subtitling_type */
1684 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1685 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1686 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1687 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1688 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1689 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1690 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1694 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1695 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1701 language[i * 4 - 1] = 0;
1702 av_dict_set(&st->metadata, "language", language, 0);
1706 case 0x0a: /* ISO 639 language descriptor */
1707 for (i = 0; i + 4 <= desc_len; i += 4) {
1708 language[i + 0] = get8(pp, desc_end);
1709 language[i + 1] = get8(pp, desc_end);
1710 language[i + 2] = get8(pp, desc_end);
1711 language[i + 3] = ',';
1712 switch (get8(pp, desc_end)) {
1714 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1717 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1720 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1724 if (i && language[0]) {
1725 language[i - 1] = 0;
1726 av_dict_set(&st->metadata, "language", language, 0);
1729 case 0x05: /* registration descriptor */
1730 st->codec->codec_tag = bytestream_get_le32(pp);
1731 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1732 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1733 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1735 case 0x52: /* stream identifier descriptor */
1736 st->stream_identifier = 1 + get8(pp, desc_end);
1738 case 0x26: /* metadata descriptor */
1739 if (get16(pp, desc_end) == 0xFFFF)
1741 if (get8(pp, desc_end) == 0xFF) {
1742 st->codec->codec_tag = bytestream_get_le32(pp);
1743 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1744 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1747 case 0x7f: /* DVB extension descriptor */
1748 ext_desc_tag = get8(pp, desc_end);
1749 if (ext_desc_tag < 0)
1750 return AVERROR_INVALIDDATA;
1751 if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1752 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1753 if (!st->codec->extradata) {
1754 st->codec->extradata = av_mallocz(sizeof(opus_default_extradata) +
1755 FF_INPUT_BUFFER_PADDING_SIZE);
1756 if (!st->codec->extradata)
1757 return AVERROR(ENOMEM);
1759 st->codec->extradata_size = sizeof(opus_default_extradata);
1760 memcpy(st->codec->extradata, opus_default_extradata, sizeof(opus_default_extradata));
1762 channel_config_code = get8(pp, desc_end);
1763 if (channel_config_code < 0)
1764 return AVERROR_INVALIDDATA;
1765 if (channel_config_code <= 0x8) {
1766 st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1767 st->codec->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
1768 st->codec->extradata[19] = opus_stream_cnt[channel_config_code];
1769 st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1770 memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1772 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1774 st->need_parsing = AVSTREAM_PARSE_FULL;
1785 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1787 MpegTSContext *ts = filter->u.section_filter.opaque;
1788 SectionHeader h1, *h = &h1;
1791 const uint8_t *p, *p_end, *desc_list_end;
1792 int program_info_length, pcr_pid, pid, stream_type;
1794 uint32_t prog_reg_desc = 0; /* registration descriptor */
1796 int mp4_descr_count = 0;
1797 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1800 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1801 hex_dump_debug(ts->stream, section, section_len);
1803 p_end = section + section_len - 4;
1805 if (parse_section_header(h, &p, p_end) < 0)
1808 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d version=%d\n",
1809 h->id, h->sec_num, h->last_sec_num, h->version);
1811 if (h->tid != PMT_TID)
1813 if (!ts->scan_all_pmts && ts->skip_changes)
1816 if (!ts->skip_clear)
1817 clear_program(ts, h->id);
1819 pcr_pid = get16(&p, p_end);
1823 add_pid_to_pmt(ts, h->id, pcr_pid);
1824 set_pcr_pid(ts->stream, h->id, pcr_pid);
1826 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1828 program_info_length = get16(&p, p_end);
1829 if (program_info_length < 0)
1831 program_info_length &= 0xfff;
1832 while (program_info_length >= 2) {
1834 tag = get8(&p, p_end);
1835 len = get8(&p, p_end);
1837 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1839 if (len > program_info_length - 2)
1840 // something else is broken, exit the program_descriptors_loop
1842 program_info_length -= len + 2;
1843 if (tag == 0x1d) { // IOD descriptor
1844 get8(&p, p_end); // scope
1845 get8(&p, p_end); // label
1847 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1848 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1849 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1850 prog_reg_desc = bytestream_get_le32(&p);
1855 p += program_info_length;
1859 // stop parsing after pmt, we found header
1860 if (!ts->stream->nb_streams)
1863 set_pmt_found(ts, h->id);
1869 stream_type = get8(&p, p_end);
1870 if (stream_type < 0)
1872 pid = get16(&p, p_end);
1876 if (pid == ts->current_pid)
1879 /* now create stream */
1880 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1881 pes = ts->pids[pid]->u.pes_filter.opaque;
1883 pes->st = avformat_new_stream(pes->stream, NULL);
1886 pes->st->id = pes->pid;
1889 } else if (stream_type != 0x13) {
1891 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1892 pes = add_pes_stream(ts, pid, pcr_pid);
1894 st = avformat_new_stream(pes->stream, NULL);
1900 int idx = ff_find_stream_index(ts->stream, pid);
1902 st = ts->stream->streams[idx];
1904 st = avformat_new_stream(ts->stream, NULL);
1908 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1915 if (pes && !pes->stream_type)
1916 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1918 add_pid_to_pmt(ts, h->id, pid);
1920 ff_program_add_stream_index(ts->stream, h->id, st->index);
1922 desc_list_len = get16(&p, p_end);
1923 if (desc_list_len < 0)
1925 desc_list_len &= 0xfff;
1926 desc_list_end = p + desc_list_len;
1927 if (desc_list_end > p_end)
1930 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1931 desc_list_end, mp4_descr,
1932 mp4_descr_count, pid, ts) < 0)
1935 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1936 stream_type == 0x83 && pes->sub_st) {
1937 ff_program_add_stream_index(ts->stream, h->id,
1938 pes->sub_st->index);
1939 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1945 if (!ts->pids[pcr_pid])
1946 mpegts_open_pcr_filter(ts, pcr_pid);
1949 for (i = 0; i < mp4_descr_count; i++)
1950 av_free(mp4_descr[i].dec_config_descr);
1953 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1955 MpegTSContext *ts = filter->u.section_filter.opaque;
1956 SectionHeader h1, *h = &h1;
1957 const uint8_t *p, *p_end;
1961 av_dlog(ts->stream, "PAT:\n");
1962 hex_dump_debug(ts->stream, section, section_len);
1964 p_end = section + section_len - 4;
1966 if (parse_section_header(h, &p, p_end) < 0)
1968 if (h->tid != PAT_TID)
1970 if (ts->skip_changes)
1973 ts->stream->ts_id = h->id;
1977 sid = get16(&p, p_end);
1980 pmt_pid = get16(&p, p_end);
1985 if (pmt_pid == ts->current_pid)
1988 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1990 if (sid == 0x0000) {
1993 MpegTSFilter *fil = ts->pids[pmt_pid];
1994 program = av_new_program(ts->stream, sid);
1996 program->program_num = sid;
1997 program->pmt_pid = pmt_pid;
2000 if ( fil->type != MPEGTS_SECTION
2001 || fil->pid != pmt_pid
2002 || fil->u.section_filter.section_cb != pmt_cb)
2003 mpegts_close_filter(ts, ts->pids[pmt_pid]);
2005 if (!ts->pids[pmt_pid])
2006 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2007 add_pat_entry(ts, sid);
2008 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2009 add_pid_to_pmt(ts, sid, pmt_pid);
2015 for (j=0; j<ts->stream->nb_programs; j++) {
2016 for (i = 0; i < ts->nb_prg; i++)
2017 if (ts->prg[i].id == ts->stream->programs[j]->id)
2019 if (i==ts->nb_prg && !ts->skip_clear)
2020 clear_avprogram(ts, ts->stream->programs[j]->id);
2025 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2027 MpegTSContext *ts = filter->u.section_filter.opaque;
2028 SectionHeader h1, *h = &h1;
2029 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2030 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2031 char *name, *provider_name;
2033 av_dlog(ts->stream, "SDT:\n");
2034 hex_dump_debug(ts->stream, section, section_len);
2036 p_end = section + section_len - 4;
2038 if (parse_section_header(h, &p, p_end) < 0)
2040 if (h->tid != SDT_TID)
2042 if (ts->skip_changes)
2044 onid = get16(&p, p_end);
2047 val = get8(&p, p_end);
2051 sid = get16(&p, p_end);
2054 val = get8(&p, p_end);
2057 desc_list_len = get16(&p, p_end);
2058 if (desc_list_len < 0)
2060 desc_list_len &= 0xfff;
2061 desc_list_end = p + desc_list_len;
2062 if (desc_list_end > p_end)
2065 desc_tag = get8(&p, desc_list_end);
2068 desc_len = get8(&p, desc_list_end);
2069 desc_end = p + desc_len;
2070 if (desc_len < 0 || desc_end > desc_list_end)
2073 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
2074 desc_tag, desc_len);
2078 service_type = get8(&p, p_end);
2079 if (service_type < 0)
2081 provider_name = getstr8(&p, p_end);
2084 name = getstr8(&p, p_end);
2086 AVProgram *program = av_new_program(ts->stream, sid);
2088 av_dict_set(&program->metadata, "service_name", name, 0);
2089 av_dict_set(&program->metadata, "service_provider",
2094 av_free(provider_name);
2105 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2106 const uint8_t *packet);
2108 /* handle one TS packet */
2109 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2112 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2113 has_adaptation, has_payload;
2114 const uint8_t *p, *p_end;
2117 pid = AV_RB16(packet + 1) & 0x1fff;
2118 if (pid && discard_pid(ts, pid))
2120 is_start = packet[1] & 0x40;
2121 tss = ts->pids[pid];
2122 if (ts->auto_guess && !tss && is_start) {
2123 add_pes_stream(ts, pid, -1);
2124 tss = ts->pids[pid];
2128 ts->current_pid = pid;
2130 afc = (packet[3] >> 4) & 3;
2131 if (afc == 0) /* reserved value */
2133 has_adaptation = afc & 2;
2134 has_payload = afc & 1;
2135 is_discontinuity = has_adaptation &&
2136 packet[4] != 0 && /* with length > 0 */
2137 (packet[5] & 0x80); /* and discontinuity indicated */
2139 /* continuity check (currently not used) */
2140 cc = (packet[3] & 0xf);
2141 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2142 cc_ok = pid == 0x1FFF || // null packet PID
2149 av_log(ts->stream, AV_LOG_DEBUG,
2150 "Continuity check failed for pid %d expected %d got %d\n",
2151 pid, expected_cc, cc);
2152 if (tss->type == MPEGTS_PES) {
2153 PESContext *pc = tss->u.pes_filter.opaque;
2154 pc->flags |= AV_PKT_FLAG_CORRUPT;
2159 if (has_adaptation) {
2162 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2163 tss->last_pcr = pcr_h * 300 + pcr_l;
2164 /* skip adaptation field */
2167 /* if past the end of packet, ignore */
2168 p_end = packet + TS_PACKET_SIZE;
2169 if (p >= p_end || !has_payload)
2172 pos = avio_tell(ts->stream->pb);
2174 av_assert0(pos >= TS_PACKET_SIZE);
2175 ts->pos47_full = pos - TS_PACKET_SIZE;
2178 if (tss->type == MPEGTS_SECTION) {
2180 /* pointer field present */
2182 if (p + len > p_end)
2185 /* write remaining section bytes */
2186 write_section_data(ts, tss,
2188 /* check whether filter has been closed */
2194 write_section_data(ts, tss,
2199 write_section_data(ts, tss,
2204 // stop find_stream_info from waiting for more streams
2205 // when all programs have received a PMT
2206 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2208 for (i = 0; i < ts->nb_prg; i++) {
2209 if (!ts->prg[i].pmt_found)
2212 if (i == ts->nb_prg && ts->nb_prg > 0) {
2214 for (i = 0; i < ts->stream->nb_streams; i++) {
2215 AVStream *st = ts->stream->streams[i];
2216 types |= 1<<st->codec->codec_type;
2218 if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2219 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2220 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2227 // Note: The position here points actually behind the current packet.
2228 if (tss->type == MPEGTS_PES) {
2229 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2230 pos - ts->raw_packet_size)) < 0)
2238 static void reanalyze(MpegTSContext *ts) {
2239 AVIOContext *pb = ts->stream->pb;
2240 int64_t pos = avio_tell(pb);
2243 pos -= ts->pos47_full;
2244 if (pos == TS_PACKET_SIZE) {
2245 ts->size_stat[0] ++;
2246 } else if (pos == TS_DVHS_PACKET_SIZE) {
2247 ts->size_stat[1] ++;
2248 } else if (pos == TS_FEC_PACKET_SIZE) {
2249 ts->size_stat[2] ++;
2252 ts->size_stat_count ++;
2253 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2255 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2256 newsize = TS_PACKET_SIZE;
2257 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2258 newsize = TS_DVHS_PACKET_SIZE;
2259 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2260 newsize = TS_FEC_PACKET_SIZE;
2262 if (newsize && newsize != ts->raw_packet_size) {
2263 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2264 ts->raw_packet_size = newsize;
2266 ts->size_stat_count = 0;
2267 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2271 /* XXX: try to find a better synchro over several packets (use
2272 * get_packet_size() ?) */
2273 static int mpegts_resync(AVFormatContext *s)
2275 MpegTSContext *ts = s->priv_data;
2276 AVIOContext *pb = s->pb;
2279 for (i = 0; i < ts->resync_size; i++) {
2284 avio_seek(pb, -1, SEEK_CUR);
2285 reanalyze(s->priv_data);
2289 av_log(s, AV_LOG_ERROR,
2290 "max resync size reached, could not find sync byte\n");
2292 return AVERROR_INVALIDDATA;
2295 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2296 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2297 const uint8_t **data)
2299 AVIOContext *pb = s->pb;
2303 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2304 if (len != TS_PACKET_SIZE)
2305 return len < 0 ? len : AVERROR_EOF;
2306 /* check packet sync byte */
2307 if ((*data)[0] != 0x47) {
2308 /* find a new packet start */
2309 uint64_t pos = avio_tell(pb);
2310 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2312 if (mpegts_resync(s) < 0)
2313 return AVERROR(EAGAIN);
2323 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2325 AVIOContext *pb = s->pb;
2326 int skip = raw_packet_size - TS_PACKET_SIZE;
2328 avio_skip(pb, skip);
2331 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2333 AVFormatContext *s = ts->stream;
2334 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2335 const uint8_t *data;
2339 if (avio_tell(s->pb) != ts->last_pos) {
2341 av_dlog(ts->stream, "Skipping after seek\n");
2342 /* seek detected, flush pes buffer */
2343 for (i = 0; i < NB_PID_MAX; i++) {
2345 if (ts->pids[i]->type == MPEGTS_PES) {
2346 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2347 av_buffer_unref(&pes->buffer);
2348 pes->data_index = 0;
2349 pes->state = MPEGTS_SKIP; /* skip until pes header */
2351 ts->pids[i]->last_cc = -1;
2352 ts->pids[i]->last_pcr = -1;
2359 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2362 if (nb_packets != 0 && packet_num >= nb_packets ||
2363 ts->stop_parse > 1) {
2364 ret = AVERROR(EAGAIN);
2367 if (ts->stop_parse > 0)
2370 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2373 ret = handle_packet(ts, data);
2374 finished_reading_packet(s, ts->raw_packet_size);
2378 ts->last_pos = avio_tell(s->pb);
2382 static int mpegts_probe(AVProbeData *p)
2384 const int size = p->buf_size;
2388 int check_count = size / TS_FEC_PACKET_SIZE;
2389 #define CHECK_COUNT 10
2390 #define CHECK_BLOCK 100
2392 if (check_count < CHECK_COUNT)
2393 return AVERROR_INVALIDDATA;
2395 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2396 int left = FFMIN(check_count - i, CHECK_BLOCK);
2397 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2398 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2399 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2400 score = FFMAX3(score, dvhs_score, fec_score);
2402 maxscore = FFMAX(maxscore, score);
2405 sumscore = sumscore * CHECK_COUNT / check_count;
2406 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2408 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2410 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2411 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2413 return AVERROR_INVALIDDATA;
2416 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2417 * (-1) if not available */
2418 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2420 int afc, len, flags;
2424 afc = (packet[3] >> 4) & 3;
2426 return AVERROR_INVALIDDATA;
2431 return AVERROR_INVALIDDATA;
2434 if (!(flags & 0x10))
2435 return AVERROR_INVALIDDATA;
2437 return AVERROR_INVALIDDATA;
2439 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2440 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2444 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2446 /* NOTE: We attempt to seek on non-seekable files as well, as the
2447 * probe buffer usually is big enough. Only warn if the seek failed
2448 * on files where the seek should work. */
2449 if (avio_seek(pb, pos, SEEK_SET) < 0)
2450 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2453 static int mpegts_read_header(AVFormatContext *s)
2455 MpegTSContext *ts = s->priv_data;
2456 AVIOContext *pb = s->pb;
2457 uint8_t buf[8 * 1024] = {0};
2459 int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2461 if (ffio_ensure_seekback(pb, probesize) < 0)
2462 av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
2464 /* read the first 8192 bytes to get packet size */
2465 pos = avio_tell(pb);
2466 len = avio_read(pb, buf, sizeof(buf));
2467 ts->raw_packet_size = get_packet_size(buf, len);
2468 if (ts->raw_packet_size <= 0) {
2469 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2470 ts->raw_packet_size = TS_PACKET_SIZE;
2475 if (s->iformat == &ff_mpegts_demuxer) {
2478 /* first do a scan to get all the services */
2479 seek_back(s, pb, pos);
2481 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2483 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2485 handle_packets(ts, probesize / ts->raw_packet_size);
2486 /* if could not find service, enable auto_guess */
2490 av_dlog(ts->stream, "tuning done\n");
2492 s->ctx_flags |= AVFMTCTX_NOHEADER;
2495 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2496 int64_t pcrs[2], pcr_h;
2497 int packet_count[2];
2498 uint8_t packet[TS_PACKET_SIZE];
2499 const uint8_t *data;
2501 /* only read packets */
2503 st = avformat_new_stream(s, NULL);
2505 return AVERROR(ENOMEM);
2506 avpriv_set_pts_info(st, 60, 1, 27000000);
2507 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2508 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2510 /* we iterate until we find two PCRs to estimate the bitrate */
2515 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2518 pid = AV_RB16(data + 1) & 0x1fff;
2519 if ((pcr_pid == -1 || pcr_pid == pid) &&
2520 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2521 finished_reading_packet(s, ts->raw_packet_size);
2523 packet_count[nb_pcrs] = nb_packets;
2524 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2529 finished_reading_packet(s, ts->raw_packet_size);
2534 /* NOTE1: the bitrate is computed without the FEC */
2535 /* NOTE2: it is only the bitrate of the start of the stream */
2536 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2537 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2538 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2539 st->codec->bit_rate = s->bit_rate;
2540 st->start_time = ts->cur_pcr;
2541 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2542 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2545 seek_back(s, pb, pos);
2549 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2551 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2553 MpegTSContext *ts = s->priv_data;
2555 int64_t pcr_h, next_pcr_h, pos;
2556 int pcr_l, next_pcr_l;
2557 uint8_t pcr_buf[12];
2558 const uint8_t *data;
2560 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2561 return AVERROR(ENOMEM);
2562 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2563 pkt->pos = avio_tell(s->pb);
2565 av_free_packet(pkt);
2568 if (data != pkt->data)
2569 memcpy(pkt->data, data, ts->raw_packet_size);
2570 finished_reading_packet(s, ts->raw_packet_size);
2571 if (ts->mpeg2ts_compute_pcr) {
2572 /* compute exact PCR for each packet */
2573 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2574 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2575 pos = avio_tell(s->pb);
2576 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2577 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2578 avio_read(s->pb, pcr_buf, 12);
2579 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2580 /* XXX: not precise enough */
2582 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2587 avio_seek(s->pb, pos, SEEK_SET);
2588 /* no next PCR found: we use previous increment */
2589 ts->cur_pcr = pcr_h * 300 + pcr_l;
2591 pkt->pts = ts->cur_pcr;
2592 pkt->duration = ts->pcr_incr;
2593 ts->cur_pcr += ts->pcr_incr;
2595 pkt->stream_index = 0;
2599 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2601 MpegTSContext *ts = s->priv_data;
2606 ret = handle_packets(ts, 0);
2608 av_free_packet(ts->pkt);
2609 /* flush pes data left */
2610 for (i = 0; i < NB_PID_MAX; i++)
2611 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2612 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2613 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2614 new_pes_packet(pes, pkt);
2615 pes->state = MPEGTS_SKIP;
2622 if (!ret && pkt->size < 0)
2623 ret = AVERROR(EINTR);
2627 static void mpegts_free(MpegTSContext *ts)
2633 for (i = 0; i < NB_PID_MAX; i++)
2635 mpegts_close_filter(ts, ts->pids[i]);
2638 static int mpegts_read_close(AVFormatContext *s)
2640 MpegTSContext *ts = s->priv_data;
2645 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2646 int64_t *ppos, int64_t pos_limit)
2648 MpegTSContext *ts = s->priv_data;
2649 int64_t pos, timestamp;
2650 uint8_t buf[TS_PACKET_SIZE];
2651 int pcr_l, pcr_pid =
2652 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2653 int pos47 = ts->pos47_full % ts->raw_packet_size;
2655 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2656 ts->raw_packet_size + pos47;
2657 while(pos < pos_limit) {
2658 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2659 return AV_NOPTS_VALUE;
2660 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2661 return AV_NOPTS_VALUE;
2662 if (buf[0] != 0x47) {
2663 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2664 if (mpegts_resync(s) < 0)
2665 return AV_NOPTS_VALUE;
2666 pos = avio_tell(s->pb);
2669 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2670 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2674 pos += ts->raw_packet_size;
2677 return AV_NOPTS_VALUE;
2680 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2681 int64_t *ppos, int64_t pos_limit)
2683 MpegTSContext *ts = s->priv_data;
2685 int pos47 = ts->pos47_full % ts->raw_packet_size;
2686 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2687 ff_read_frame_flush(s);
2688 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2689 return AV_NOPTS_VALUE;
2690 while(pos < pos_limit) {
2693 av_init_packet(&pkt);
2694 ret = av_read_frame(s, &pkt);
2696 return AV_NOPTS_VALUE;
2697 av_free_packet(&pkt);
2698 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2699 ff_reduce_index(s, pkt.stream_index);
2700 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2701 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2709 return AV_NOPTS_VALUE;
2712 /**************************************************************/
2713 /* parsing functions - called from other demuxers such as RTP */
2715 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
2719 ts = av_mallocz(sizeof(MpegTSContext));
2722 /* no stream case, currently used by RTP */
2723 ts->raw_packet_size = TS_PACKET_SIZE;
2726 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2727 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2732 /* return the consumed length if a packet was output, or -1 if no
2733 * packet is output */
2734 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2735 const uint8_t *buf, int len)
2743 if (len < TS_PACKET_SIZE)
2744 return AVERROR_INVALIDDATA;
2745 if (buf[0] != 0x47) {
2749 handle_packet(ts, buf);
2750 buf += TS_PACKET_SIZE;
2751 len -= TS_PACKET_SIZE;
2752 if (ts->stop_parse == 1)
2759 void avpriv_mpegts_parse_close(MpegTSContext *ts)
2765 AVInputFormat ff_mpegts_demuxer = {
2767 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2768 .priv_data_size = sizeof(MpegTSContext),
2769 .read_probe = mpegts_probe,
2770 .read_header = mpegts_read_header,
2771 .read_packet = mpegts_read_packet,
2772 .read_close = mpegts_read_close,
2773 .read_timestamp = mpegts_get_dts,
2774 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2775 .priv_class = &mpegts_class,
2778 AVInputFormat ff_mpegtsraw_demuxer = {
2779 .name = "mpegtsraw",
2780 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2781 .priv_data_size = sizeof(MpegTSContext),
2782 .read_header = mpegts_read_header,
2783 .read_packet = mpegts_raw_read_packet,
2784 .read_close = mpegts_read_close,
2785 .read_timestamp = mpegts_get_dts,
2786 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2787 .priv_class = &mpegtsraw_class,