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 */
146 /******************************************/
147 /* private mpegts data */
149 /** structure to keep track of Program->pids mapping */
153 int8_t crc_validity[NB_PID_MAX];
154 /** filters for various streams specified by PMT + for the PAT and PMT */
155 MpegTSFilter *pids[NB_PID_MAX];
159 #define MPEGTS_OPTIONS \
160 { "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 }
162 static const AVOption options[] = {
164 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
165 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
166 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
167 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
168 {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
169 {.i64 = 0}, 0, 1, 0 },
170 {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
171 {.i64 = 0}, 0, 1, 0 },
175 static const AVClass mpegts_class = {
176 .class_name = "mpegts demuxer",
177 .item_name = av_default_item_name,
179 .version = LIBAVUTIL_VERSION_INT,
182 static const AVOption raw_options[] = {
184 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
185 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
186 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
187 { "ts_packetsize", "Output option carrying the raw packet size.",
188 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
190 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
194 static const AVClass mpegtsraw_class = {
195 .class_name = "mpegtsraw demuxer",
196 .item_name = av_default_item_name,
197 .option = raw_options,
198 .version = LIBAVUTIL_VERSION_INT,
201 /* TS stream handling */
206 MPEGTS_PESHEADER_FILL,
211 /* enough for PES header + length */
212 #define PES_START_SIZE 6
213 #define PES_HEADER_SIZE 9
214 #define MAX_PES_HEADER_SIZE (9 + 255)
216 typedef struct PESContext {
218 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
221 AVFormatContext *stream;
223 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
224 enum MpegTSState state;
225 /* used to get the format */
227 int flags; /**< copied to the AVPacket flags */
230 int extended_stream_id;
232 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
233 uint8_t header[MAX_PES_HEADER_SIZE];
238 extern AVInputFormat ff_mpegts_demuxer;
240 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
243 for (i = 0; i < ts->nb_prg; i++) {
244 if (ts->prg[i].id == programid) {
251 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
253 AVProgram *prg = NULL;
256 for (i = 0; i < ts->stream->nb_programs; i++)
257 if (ts->stream->programs[i]->id == programid) {
258 prg = ts->stream->programs[i];
263 prg->nb_stream_indexes = 0;
266 static void clear_program(MpegTSContext *ts, unsigned int programid)
270 clear_avprogram(ts, programid);
271 for (i = 0; i < ts->nb_prg; i++)
272 if (ts->prg[i].id == programid) {
273 ts->prg[i].nb_pids = 0;
274 ts->prg[i].pmt_found = 0;
278 static void clear_programs(MpegTSContext *ts)
284 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
287 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
291 p = &ts->prg[ts->nb_prg];
298 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
301 struct Program *p = get_program(ts, programid);
306 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
309 for (i = 0; i < MAX_PIDS_PER_PROGRAM; i++)
310 if (p->pids[i] == pid)
313 p->pids[p->nb_pids++] = pid;
316 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
318 struct Program *p = get_program(ts, programid);
325 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
328 for (i = 0; i < s->nb_programs; i++) {
329 if (s->programs[i]->id == programid) {
330 s->programs[i]->pcr_pid = pid;
337 * @brief discard_pid() decides if the pid is to be discarded according
338 * to caller's programs selection
339 * @param ts : - TS context
341 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
344 static int discard_pid(MpegTSContext *ts, unsigned int pid)
347 int used = 0, discarded = 0;
350 /* If none of the programs have .discard=AVDISCARD_ALL then there's
351 * no way we have to discard this packet */
352 for (k = 0; k < ts->stream->nb_programs; k++)
353 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
355 if (k == ts->stream->nb_programs)
358 for (i = 0; i < ts->nb_prg; i++) {
360 for (j = 0; j < p->nb_pids; j++) {
361 if (p->pids[j] != pid)
363 // is program with id p->id set to be discarded?
364 for (k = 0; k < ts->stream->nb_programs; k++) {
365 if (ts->stream->programs[k]->id == p->id) {
366 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
375 return !used && discarded;
379 * Assemble PES packets out of TS packets, and then call the "section_cb"
380 * function when they are complete.
382 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
383 const uint8_t *buf, int buf_size, int is_start)
385 MpegTSSectionFilter *tss = &tss1->u.section_filter;
389 memcpy(tss->section_buf, buf, buf_size);
390 tss->section_index = buf_size;
391 tss->section_h_size = -1;
392 tss->end_of_section_reached = 0;
394 if (tss->end_of_section_reached)
396 len = 4096 - tss->section_index;
399 memcpy(tss->section_buf + tss->section_index, buf, len);
400 tss->section_index += len;
403 /* compute section length if possible */
404 if (tss->section_h_size == -1 && tss->section_index >= 3) {
405 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
408 tss->section_h_size = len;
411 if (tss->section_h_size != -1 &&
412 tss->section_index >= tss->section_h_size) {
414 tss->end_of_section_reached = 1;
416 if (tss->check_crc) {
417 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
419 ts->crc_validity[ tss1->pid ] = 100;
420 }else if (ts->crc_validity[ tss1->pid ] > -10) {
421 ts->crc_validity[ tss1->pid ]--;
426 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
430 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
431 enum MpegTSFilterType type)
433 MpegTSFilter *filter;
435 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
437 if (pid >= NB_PID_MAX || ts->pids[pid])
439 filter = av_mallocz(sizeof(MpegTSFilter));
442 ts->pids[pid] = filter;
447 filter->last_cc = -1;
448 filter->last_pcr= -1;
453 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
455 SectionCallback *section_cb,
459 MpegTSFilter *filter;
460 MpegTSSectionFilter *sec;
462 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
464 sec = &filter->u.section_filter;
465 sec->section_cb = section_cb;
466 sec->opaque = opaque;
467 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
468 sec->check_crc = check_crc;
469 if (!sec->section_buf) {
476 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
480 MpegTSFilter *filter;
481 MpegTSPESFilter *pes;
483 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
486 pes = &filter->u.pes_filter;
487 pes->pes_cb = pes_cb;
488 pes->opaque = opaque;
492 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
494 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
497 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
502 if (filter->type == MPEGTS_SECTION)
503 av_freep(&filter->u.section_filter.section_buf);
504 else if (filter->type == MPEGTS_PES) {
505 PESContext *pes = filter->u.pes_filter.opaque;
506 av_buffer_unref(&pes->buffer);
507 /* referenced private data will be freed later in
508 * avformat_close_input */
509 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
510 av_freep(&filter->u.pes_filter.opaque);
515 ts->pids[pid] = NULL;
518 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
520 int stat[TS_MAX_PACKET_SIZE];
525 memset(stat, 0, packet_size * sizeof(*stat));
527 for (i = 0; i < size - 3; i++) {
528 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
529 int x = i % packet_size;
532 if (stat[x] > best_score) {
533 best_score = stat[x];
540 return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
543 /* autodetect fec presence. Must have at least 1024 bytes */
544 static int get_packet_size(const uint8_t *buf, int size)
546 int score, fec_score, dvhs_score;
548 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
549 return AVERROR_INVALIDDATA;
551 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
552 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
553 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
554 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
555 score, dvhs_score, fec_score);
557 if (score > fec_score && score > dvhs_score)
558 return TS_PACKET_SIZE;
559 else if (dvhs_score > score && dvhs_score > fec_score)
560 return TS_DVHS_PACKET_SIZE;
561 else if (score < fec_score && dvhs_score < fec_score)
562 return TS_FEC_PACKET_SIZE;
564 return AVERROR_INVALIDDATA;
567 typedef struct SectionHeader {
572 uint8_t last_sec_num;
575 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
582 return AVERROR_INVALIDDATA;
588 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
594 if ((p + 1) >= p_end)
595 return AVERROR_INVALIDDATA;
602 /* read and allocate a DVB string preceded by its length */
603 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
610 len = get8(&p, p_end);
613 if ((p + len) > p_end)
615 str = av_malloc(len + 1);
625 static int parse_section_header(SectionHeader *h,
626 const uint8_t **pp, const uint8_t *p_end)
630 val = get8(pp, p_end);
635 val = get16(pp, p_end);
639 val = get8(pp, p_end);
642 h->version = (val >> 1) & 0x1f;
643 val = get8(pp, p_end);
647 val = get8(pp, p_end);
650 h->last_sec_num = val;
655 uint32_t stream_type;
656 enum AVMediaType codec_type;
657 enum AVCodecID codec_id;
660 static const StreamType ISO_types[] = {
661 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
662 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
663 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
664 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
665 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
666 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
667 /* Makito encoder sets stream type 0x11 for AAC,
668 * so auto-detect LOAS/LATM instead of hardcoding it. */
669 #if !CONFIG_LOAS_DEMUXER
670 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
672 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
673 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
674 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
675 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
676 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
680 static const StreamType HDMV_types[] = {
681 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
682 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
683 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
684 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
685 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
686 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
687 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
688 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
689 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
690 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
695 static const StreamType MISC_types[] = {
696 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
697 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
701 static const StreamType REGD_types[] = {
702 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
703 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
704 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
705 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
706 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
707 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
708 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
709 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
710 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
711 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
715 static const StreamType METADATA_types[] = {
716 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
717 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
721 /* descriptor present */
722 static const StreamType DESC_types[] = {
723 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
724 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
725 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
726 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
727 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
731 static void mpegts_find_stream_type(AVStream *st,
732 uint32_t stream_type,
733 const StreamType *types)
735 if (avcodec_is_open(st->codec)) {
736 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
740 for (; types->stream_type; types++)
741 if (stream_type == types->stream_type) {
742 st->codec->codec_type = types->codec_type;
743 st->codec->codec_id = types->codec_id;
744 st->request_probe = 0;
749 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
750 uint32_t stream_type, uint32_t prog_reg_desc)
752 int old_codec_type = st->codec->codec_type;
753 int old_codec_id = st->codec->codec_id;
755 if (avcodec_is_open(st->codec)) {
756 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
760 avpriv_set_pts_info(st, 33, 1, 90000);
762 st->codec->codec_type = AVMEDIA_TYPE_DATA;
763 st->codec->codec_id = AV_CODEC_ID_NONE;
764 st->need_parsing = AVSTREAM_PARSE_FULL;
766 pes->stream_type = stream_type;
768 av_log(pes->stream, AV_LOG_DEBUG,
769 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
770 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
772 st->codec->codec_tag = pes->stream_type;
774 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
775 if ((prog_reg_desc == AV_RL32("HDMV") ||
776 prog_reg_desc == AV_RL32("HDPR")) &&
777 st->codec->codec_id == AV_CODEC_ID_NONE) {
778 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
779 if (pes->stream_type == 0x83) {
780 // HDMV TrueHD streams also contain an AC3 coded version of the
781 // audio track - add a second stream for this
783 // priv_data cannot be shared between streams
784 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
786 return AVERROR(ENOMEM);
787 memcpy(sub_pes, pes, sizeof(*sub_pes));
789 sub_st = avformat_new_stream(pes->stream, NULL);
792 return AVERROR(ENOMEM);
795 sub_st->id = pes->pid;
796 avpriv_set_pts_info(sub_st, 33, 1, 90000);
797 sub_st->priv_data = sub_pes;
798 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
799 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
800 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
801 sub_pes->sub_st = pes->sub_st = sub_st;
804 if (st->codec->codec_id == AV_CODEC_ID_NONE)
805 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
806 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
807 st->codec->codec_id = old_codec_id;
808 st->codec->codec_type = old_codec_type;
814 static void reset_pes_packet_state(PESContext *pes)
816 pes->pts = AV_NOPTS_VALUE;
817 pes->dts = AV_NOPTS_VALUE;
820 av_buffer_unref(&pes->buffer);
823 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
827 pkt->buf = pes->buffer;
828 pkt->data = pes->buffer->data;
829 pkt->size = pes->data_index;
831 if (pes->total_size != MAX_PES_PAYLOAD &&
832 pes->pes_header_size + pes->data_index != pes->total_size +
834 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
835 pes->flags |= AV_PKT_FLAG_CORRUPT;
837 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
839 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
840 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
841 pkt->stream_index = pes->sub_st->index;
843 pkt->stream_index = pes->st->index;
846 /* store position of first TS packet of this PES packet */
847 pkt->pos = pes->ts_packet_pos;
848 pkt->flags = pes->flags;
851 reset_pes_packet_state(pes);
854 static uint64_t get_ts64(GetBitContext *gb, int bits)
856 if (get_bits_left(gb) < bits)
857 return AV_NOPTS_VALUE;
858 return get_bits64(gb, bits);
861 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
862 const uint8_t *buf, int buf_size)
865 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
866 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
867 int dts_flag = -1, cts_flag = -1;
868 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
869 uint8_t buf_padded[128 + FF_INPUT_BUFFER_PADDING_SIZE];
870 int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - FF_INPUT_BUFFER_PADDING_SIZE);
872 memcpy(buf_padded, buf, buf_padded_size);
874 init_get_bits(&gb, buf_padded, buf_padded_size * 8);
876 if (sl->use_au_start)
877 au_start_flag = get_bits1(&gb);
879 au_end_flag = get_bits1(&gb);
880 if (!sl->use_au_start && !sl->use_au_end)
881 au_start_flag = au_end_flag = 1;
883 ocr_flag = get_bits1(&gb);
885 idle_flag = get_bits1(&gb);
887 padding_flag = get_bits1(&gb);
889 padding_bits = get_bits(&gb, 3);
891 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
892 if (sl->packet_seq_num_len)
893 skip_bits_long(&gb, sl->packet_seq_num_len);
894 if (sl->degr_prior_len)
896 skip_bits(&gb, sl->degr_prior_len);
898 skip_bits_long(&gb, sl->ocr_len);
900 if (sl->use_rand_acc_pt)
902 if (sl->au_seq_num_len > 0)
903 skip_bits_long(&gb, sl->au_seq_num_len);
904 if (sl->use_timestamps) {
905 dts_flag = get_bits1(&gb);
906 cts_flag = get_bits1(&gb);
909 if (sl->inst_bitrate_len)
910 inst_bitrate_flag = get_bits1(&gb);
912 dts = get_ts64(&gb, sl->timestamp_len);
914 cts = get_ts64(&gb, sl->timestamp_len);
916 skip_bits_long(&gb, sl->au_len);
917 if (inst_bitrate_flag)
918 skip_bits_long(&gb, sl->inst_bitrate_len);
921 if (dts != AV_NOPTS_VALUE)
923 if (cts != AV_NOPTS_VALUE)
926 if (sl->timestamp_len && sl->timestamp_res)
927 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
929 return (get_bits_count(&gb) + 7) >> 3;
932 /* return non zero if a packet could be constructed */
933 static int mpegts_push_data(MpegTSFilter *filter,
934 const uint8_t *buf, int buf_size, int is_start,
937 PESContext *pes = filter->u.pes_filter.opaque;
938 MpegTSContext *ts = pes->ts;
946 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
947 new_pes_packet(pes, ts->pkt);
950 reset_pes_packet_state(pes);
952 pes->state = MPEGTS_HEADER;
953 pes->ts_packet_pos = pos;
956 while (buf_size > 0) {
957 switch (pes->state) {
959 len = PES_START_SIZE - pes->data_index;
962 memcpy(pes->header + pes->data_index, p, len);
963 pes->data_index += len;
966 if (pes->data_index == PES_START_SIZE) {
967 /* we got all the PES or section header. We can now
969 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
970 pes->header[2] == 0x01) {
971 /* it must be an mpeg2 PES stream */
972 code = pes->header[3] | 0x100;
973 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
976 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
978 pes->sub_st->discard == AVDISCARD_ALL)) ||
979 code == 0x1be) /* padding_stream */
982 /* stream not present in PMT */
984 if (ts->skip_changes)
987 pes->st = avformat_new_stream(ts->stream, NULL);
989 return AVERROR(ENOMEM);
990 pes->st->id = pes->pid;
991 mpegts_set_stream_info(pes->st, pes, 0, 0);
994 pes->total_size = AV_RB16(pes->header + 4);
995 /* NOTE: a zero total size means the PES size is
997 if (!pes->total_size)
998 pes->total_size = MAX_PES_PAYLOAD;
1000 /* allocate pes buffer */
1001 pes->buffer = av_buffer_alloc(pes->total_size +
1002 FF_INPUT_BUFFER_PADDING_SIZE);
1004 return AVERROR(ENOMEM);
1006 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1007 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1008 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1009 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1010 pes->state = MPEGTS_PESHEADER;
1011 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1012 av_dlog(pes->stream,
1013 "pid=%x stream_type=%x probing\n",
1016 pes->st->request_probe = 1;
1019 pes->state = MPEGTS_PAYLOAD;
1020 pes->data_index = 0;
1023 /* otherwise, it should be a table */
1026 pes->state = MPEGTS_SKIP;
1031 /**********************************************/
1032 /* PES packing parsing */
1033 case MPEGTS_PESHEADER:
1034 len = PES_HEADER_SIZE - pes->data_index;
1036 return AVERROR_INVALIDDATA;
1039 memcpy(pes->header + pes->data_index, p, len);
1040 pes->data_index += len;
1043 if (pes->data_index == PES_HEADER_SIZE) {
1044 pes->pes_header_size = pes->header[8] + 9;
1045 pes->state = MPEGTS_PESHEADER_FILL;
1048 case MPEGTS_PESHEADER_FILL:
1049 len = pes->pes_header_size - pes->data_index;
1051 return AVERROR_INVALIDDATA;
1054 memcpy(pes->header + pes->data_index, p, len);
1055 pes->data_index += len;
1058 if (pes->data_index == pes->pes_header_size) {
1060 unsigned int flags, pes_ext, skip;
1062 flags = pes->header[7];
1063 r = pes->header + 9;
1064 pes->pts = AV_NOPTS_VALUE;
1065 pes->dts = AV_NOPTS_VALUE;
1066 if ((flags & 0xc0) == 0x80) {
1067 pes->dts = pes->pts = ff_parse_pes_pts(r);
1069 } else if ((flags & 0xc0) == 0xc0) {
1070 pes->pts = ff_parse_pes_pts(r);
1072 pes->dts = ff_parse_pes_pts(r);
1075 pes->extended_stream_id = -1;
1076 if (flags & 0x01) { /* PES extension */
1078 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1079 skip = (pes_ext >> 4) & 0xb;
1082 if ((pes_ext & 0x41) == 0x01 &&
1083 (r + 2) <= (pes->header + pes->pes_header_size)) {
1084 /* PES extension 2 */
1085 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1086 pes->extended_stream_id = r[1];
1090 /* we got the full header. We parse it and get the payload */
1091 pes->state = MPEGTS_PAYLOAD;
1092 pes->data_index = 0;
1093 if (pes->stream_type == 0x12 && buf_size > 0) {
1094 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1096 pes->pes_header_size += sl_header_bytes;
1097 p += sl_header_bytes;
1098 buf_size -= sl_header_bytes;
1100 if (pes->stream_type == 0x15 && buf_size >= 5) {
1101 /* skip metadata access unit header */
1102 pes->pes_header_size += 5;
1106 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1107 AVProgram *p = NULL;
1108 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1109 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1110 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1112 AVStream *st = NULL;
1113 if (f->type == MPEGTS_PES) {
1114 PESContext *pcrpes = f->u.pes_filter.opaque;
1117 } else if (f->type == MPEGTS_PCR) {
1119 for (i = 0; i < p->nb_stream_indexes; i++) {
1120 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1121 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1125 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1126 // teletext packets do not always have correct timestamps,
1127 // the standard says they should be handled after 40.6 ms at most,
1128 // and the pcr error to this packet should be no more than 100 ms.
1129 // TODO: we should interpolate the PCR, not just use the last one
1130 int64_t pcr = f->last_pcr / 300;
1131 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1132 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1133 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1134 pes->pts = pes->dts = pcr;
1135 } else if (pes->dts > pcr + 3654 + 9000) {
1136 pes->pts = pes->dts = pcr + 3654 + 9000;
1146 case MPEGTS_PAYLOAD:
1148 if (pes->data_index > 0 &&
1149 pes->data_index + buf_size > pes->total_size) {
1150 new_pes_packet(pes, ts->pkt);
1151 pes->total_size = MAX_PES_PAYLOAD;
1152 pes->buffer = av_buffer_alloc(pes->total_size +
1153 FF_INPUT_BUFFER_PADDING_SIZE);
1155 return AVERROR(ENOMEM);
1157 } else if (pes->data_index == 0 &&
1158 buf_size > pes->total_size) {
1159 // pes packet size is < ts size packet and pes data is padded with 0xff
1160 // not sure if this is legal in ts but see issue #2392
1161 buf_size = pes->total_size;
1163 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1164 pes->data_index += buf_size;
1165 /* emit complete packets with known packet size
1166 * decreases demuxer delay for infrequent packets like subtitles from
1167 * a couple of seconds to milliseconds for properly muxed files.
1168 * total_size is the number of bytes following pes_packet_length
1169 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1170 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1171 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1173 new_pes_packet(pes, ts->pkt);
1187 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1192 /* if no pid found, then add a pid context */
1193 pes = av_mallocz(sizeof(PESContext));
1197 pes->stream = ts->stream;
1199 pes->pcr_pid = pcr_pid;
1200 pes->state = MPEGTS_SKIP;
1201 pes->pts = AV_NOPTS_VALUE;
1202 pes->dts = AV_NOPTS_VALUE;
1203 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1216 Mp4Descr *active_descr;
1218 int max_descr_count;
1220 int predefined_SLConfigDescriptor_seen;
1221 } MP4DescrParseContext;
1223 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1224 const uint8_t *buf, unsigned size,
1225 Mp4Descr *descr, int max_descr_count)
1228 if (size > (1 << 30))
1229 return AVERROR_INVALIDDATA;
1231 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1232 NULL, NULL, NULL, NULL)) < 0)
1239 d->active_descr = NULL;
1240 d->max_descr_count = max_descr_count;
1245 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1247 int64_t new_off = avio_tell(pb);
1248 (*len) -= new_off - *off;
1252 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1255 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1258 int ret = parse_mp4_descr(d, off, len, 0);
1261 update_offsets(&d->pb, &off, &len);
1266 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1268 avio_rb16(&d->pb); // ID
1274 update_offsets(&d->pb, &off, &len);
1275 return parse_mp4_descr_arr(d, off, len);
1278 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1283 id_flags = avio_rb16(&d->pb);
1284 if (!(id_flags & 0x0020)) { // URL_Flag
1285 update_offsets(&d->pb, &off, &len);
1286 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1292 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1295 if (d->descr_count >= d->max_descr_count)
1296 return AVERROR_INVALIDDATA;
1297 ff_mp4_parse_es_descr(&d->pb, &es_id);
1298 d->active_descr = d->descr + (d->descr_count++);
1300 d->active_descr->es_id = es_id;
1301 update_offsets(&d->pb, &off, &len);
1302 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1303 update_offsets(&d->pb, &off, &len);
1305 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1306 d->active_descr = NULL;
1310 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1313 Mp4Descr *descr = d->active_descr;
1315 return AVERROR_INVALIDDATA;
1316 d->active_descr->dec_config_descr = av_malloc(len);
1317 if (!descr->dec_config_descr)
1318 return AVERROR(ENOMEM);
1319 descr->dec_config_descr_len = len;
1320 avio_read(&d->pb, descr->dec_config_descr, len);
1324 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1326 Mp4Descr *descr = d->active_descr;
1329 return AVERROR_INVALIDDATA;
1331 predefined = avio_r8(&d->pb);
1334 int flags = avio_r8(&d->pb);
1335 descr->sl.use_au_start = !!(flags & 0x80);
1336 descr->sl.use_au_end = !!(flags & 0x40);
1337 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1338 descr->sl.use_padding = !!(flags & 0x08);
1339 descr->sl.use_timestamps = !!(flags & 0x04);
1340 descr->sl.use_idle = !!(flags & 0x02);
1341 descr->sl.timestamp_res = avio_rb32(&d->pb);
1343 descr->sl.timestamp_len = avio_r8(&d->pb);
1344 if (descr->sl.timestamp_len > 64) {
1345 avpriv_request_sample(NULL, "timestamp_len > 64");
1346 descr->sl.timestamp_len = 64;
1347 return AVERROR_PATCHWELCOME;
1349 descr->sl.ocr_len = avio_r8(&d->pb);
1350 descr->sl.au_len = avio_r8(&d->pb);
1351 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1352 lengths = avio_rb16(&d->pb);
1353 descr->sl.degr_prior_len = lengths >> 12;
1354 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1355 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1356 } else if (!d->predefined_SLConfigDescriptor_seen){
1357 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1358 d->predefined_SLConfigDescriptor_seen = 1;
1363 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1367 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1368 update_offsets(&d->pb, &off, &len);
1369 if (len < 0 || len1 > len || len1 <= 0) {
1370 av_log(d->s, AV_LOG_ERROR,
1371 "Tag %x length violation new length %d bytes remaining %d\n",
1373 return AVERROR_INVALIDDATA;
1376 if (d->level++ >= MAX_LEVEL) {
1377 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1381 if (target_tag && tag != target_tag) {
1382 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1389 parse_MP4IODescrTag(d, off, len1);
1392 parse_MP4ODescrTag(d, off, len1);
1395 parse_MP4ESDescrTag(d, off, len1);
1397 case MP4DecConfigDescrTag:
1398 parse_MP4DecConfigDescrTag(d, off, len1);
1401 parse_MP4SLDescrTag(d, off, len1);
1408 avio_seek(&d->pb, off + len1, SEEK_SET);
1412 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1413 Mp4Descr *descr, int *descr_count, int max_descr_count)
1415 MP4DescrParseContext d;
1418 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1422 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1424 *descr_count = d.descr_count;
1428 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1429 Mp4Descr *descr, int *descr_count, int max_descr_count)
1431 MP4DescrParseContext d;
1434 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1438 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1440 *descr_count = d.descr_count;
1444 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1447 MpegTSContext *ts = filter->u.section_filter.opaque;
1449 const uint8_t *p, *p_end;
1451 int mp4_descr_count = 0;
1452 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1454 AVFormatContext *s = ts->stream;
1456 p_end = section + section_len - 4;
1458 if (parse_section_header(&h, &p, p_end) < 0)
1460 if (h.tid != M4OD_TID)
1463 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1464 MAX_MP4_DESCR_COUNT);
1466 for (pid = 0; pid < NB_PID_MAX; pid++) {
1469 for (i = 0; i < mp4_descr_count; i++) {
1472 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1474 if (ts->pids[pid]->type != MPEGTS_PES) {
1475 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1478 pes = ts->pids[pid]->u.pes_filter.opaque;
1483 pes->sl = mp4_descr[i].sl;
1485 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1486 mp4_descr[i].dec_config_descr_len, 0,
1487 NULL, NULL, NULL, NULL);
1488 ff_mp4_read_dec_config_descr(s, st, &pb);
1489 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1490 st->codec->extradata_size > 0)
1491 st->need_parsing = 0;
1492 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1493 st->codec->extradata_size > 0)
1494 st->need_parsing = 0;
1496 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1498 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1499 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1500 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1501 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1502 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1503 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1506 for (i = 0; i < mp4_descr_count; i++)
1507 av_free(mp4_descr[i].dec_config_descr);
1510 static const uint8_t opus_coupled_stream_cnt[9] = {
1511 1, 0, 1, 1, 2, 2, 2, 3, 3
1514 static const uint8_t opus_channel_map[8][8] = {
1522 { 0,6,1,2,3,4,5,7 },
1525 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1526 const uint8_t **pp, const uint8_t *desc_list_end,
1527 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1530 const uint8_t *desc_end;
1531 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1535 desc_tag = get8(pp, desc_list_end);
1537 return AVERROR_INVALIDDATA;
1538 desc_len = get8(pp, desc_list_end);
1540 return AVERROR_INVALIDDATA;
1541 desc_end = *pp + desc_len;
1542 if (desc_end > desc_list_end)
1543 return AVERROR_INVALIDDATA;
1545 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1547 if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1548 stream_type == STREAM_TYPE_PRIVATE_DATA)
1549 mpegts_find_stream_type(st, desc_tag, DESC_types);
1552 case 0x1E: /* SL descriptor */
1553 desc_es_id = get16(pp, desc_end);
1554 if (ts && ts->pids[pid])
1555 ts->pids[pid]->es_id = desc_es_id;
1556 for (i = 0; i < mp4_descr_count; i++)
1557 if (mp4_descr[i].dec_config_descr_len &&
1558 mp4_descr[i].es_id == desc_es_id) {
1560 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1561 mp4_descr[i].dec_config_descr_len, 0,
1562 NULL, NULL, NULL, NULL);
1563 ff_mp4_read_dec_config_descr(fc, st, &pb);
1564 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1565 st->codec->extradata_size > 0)
1566 st->need_parsing = 0;
1567 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1568 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1571 case 0x1F: /* FMC descriptor */
1572 get16(pp, desc_end);
1573 if (mp4_descr_count > 0 &&
1574 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1575 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1577 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1578 mp4_descr->dec_config_descr_len, 0,
1579 NULL, NULL, NULL, NULL);
1580 ff_mp4_read_dec_config_descr(fc, st, &pb);
1581 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1582 st->codec->extradata_size > 0) {
1583 st->request_probe = st->need_parsing = 0;
1584 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1588 case 0x56: /* DVB teletext descriptor */
1590 uint8_t *extradata = NULL;
1591 int language_count = desc_len / 5;
1593 if (desc_len > 0 && desc_len % 5 != 0)
1594 return AVERROR_INVALIDDATA;
1596 if (language_count > 0) {
1597 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1598 if (language_count > sizeof(language) / 4) {
1599 language_count = sizeof(language) / 4;
1602 if (st->codec->extradata == NULL) {
1603 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1604 return AVERROR(ENOMEM);
1608 if (st->codec->extradata_size < language_count * 2)
1609 return AVERROR_INVALIDDATA;
1611 extradata = st->codec->extradata;
1613 for (i = 0; i < language_count; i++) {
1614 language[i * 4 + 0] = get8(pp, desc_end);
1615 language[i * 4 + 1] = get8(pp, desc_end);
1616 language[i * 4 + 2] = get8(pp, desc_end);
1617 language[i * 4 + 3] = ',';
1619 memcpy(extradata, *pp, 2);
1625 language[i * 4 - 1] = 0;
1626 av_dict_set(&st->metadata, "language", language, 0);
1630 case 0x59: /* subtitling descriptor */
1632 /* 8 bytes per DVB subtitle substream data:
1633 * ISO_639_language_code (3 bytes),
1634 * subtitling_type (1 byte),
1635 * composition_page_id (2 bytes),
1636 * ancillary_page_id (2 bytes) */
1637 int language_count = desc_len / 8;
1639 if (desc_len > 0 && desc_len % 8 != 0)
1640 return AVERROR_INVALIDDATA;
1642 if (language_count > 1) {
1643 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1646 if (language_count > 0) {
1649 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1650 if (language_count > sizeof(language) / 4) {
1651 language_count = sizeof(language) / 4;
1654 if (st->codec->extradata == NULL) {
1655 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1656 return AVERROR(ENOMEM);
1660 if (st->codec->extradata_size < language_count * 5)
1661 return AVERROR_INVALIDDATA;
1663 extradata = st->codec->extradata;
1665 for (i = 0; i < language_count; i++) {
1666 language[i * 4 + 0] = get8(pp, desc_end);
1667 language[i * 4 + 1] = get8(pp, desc_end);
1668 language[i * 4 + 2] = get8(pp, desc_end);
1669 language[i * 4 + 3] = ',';
1671 /* hearing impaired subtitles detection using subtitling_type */
1673 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1674 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1675 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1676 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1677 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1678 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1679 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1683 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1684 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1690 language[i * 4 - 1] = 0;
1691 av_dict_set(&st->metadata, "language", language, 0);
1695 case 0x0a: /* ISO 639 language descriptor */
1696 for (i = 0; i + 4 <= desc_len; i += 4) {
1697 language[i + 0] = get8(pp, desc_end);
1698 language[i + 1] = get8(pp, desc_end);
1699 language[i + 2] = get8(pp, desc_end);
1700 language[i + 3] = ',';
1701 switch (get8(pp, desc_end)) {
1703 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1706 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1709 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1713 if (i && language[0]) {
1714 language[i - 1] = 0;
1715 av_dict_set(&st->metadata, "language", language, 0);
1718 case 0x05: /* registration descriptor */
1719 st->codec->codec_tag = bytestream_get_le32(pp);
1720 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1721 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1722 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1724 case 0x52: /* stream identifier descriptor */
1725 st->stream_identifier = 1 + get8(pp, desc_end);
1727 case 0x26: /* metadata descriptor */
1728 if (get16(pp, desc_end) == 0xFFFF)
1730 if (get8(pp, desc_end) == 0xFF) {
1731 st->codec->codec_tag = bytestream_get_le32(pp);
1732 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1733 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1736 case 0x7f: /* DVB extension descriptor */
1737 ext_desc_tag = get8(pp, desc_end);
1738 if (ext_desc_tag < 0)
1739 return AVERROR_INVALIDDATA;
1740 if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1741 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1742 if (!st->codec->extradata) {
1743 st->codec->extradata = av_mallocz(sizeof(opus_default_extradata) +
1744 FF_INPUT_BUFFER_PADDING_SIZE);
1745 if (!st->codec->extradata)
1746 return AVERROR(ENOMEM);
1748 st->codec->extradata_size = sizeof(opus_default_extradata);
1749 memcpy(st->codec->extradata, opus_default_extradata, sizeof(opus_default_extradata));
1751 channel_config_code = get8(pp, desc_end);
1752 if (channel_config_code < 0)
1753 return AVERROR_INVALIDDATA;
1754 if (channel_config_code <= 0x8) {
1755 st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1756 st->codec->extradata[18] = channels > 2;
1757 st->codec->extradata[19] = channel_config_code;
1758 if (channel_config_code == 0) { /* Dual Mono */
1759 st->codec->extradata[18] = 255; /* Mapping */
1760 st->codec->extradata[19] = 2; /* Stream Count */
1762 st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1763 memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1765 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1767 st->need_parsing = AVSTREAM_PARSE_FULL;
1778 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1780 MpegTSContext *ts = filter->u.section_filter.opaque;
1781 SectionHeader h1, *h = &h1;
1784 const uint8_t *p, *p_end, *desc_list_end;
1785 int program_info_length, pcr_pid, pid, stream_type;
1787 uint32_t prog_reg_desc = 0; /* registration descriptor */
1789 int mp4_descr_count = 0;
1790 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1793 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1794 hex_dump_debug(ts->stream, section, section_len);
1796 p_end = section + section_len - 4;
1798 if (parse_section_header(h, &p, p_end) < 0)
1801 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d version=%d\n",
1802 h->id, h->sec_num, h->last_sec_num, h->version);
1804 if (h->tid != PMT_TID)
1807 if (!ts->skip_clear)
1808 clear_program(ts, h->id);
1810 pcr_pid = get16(&p, p_end);
1814 add_pid_to_pmt(ts, h->id, pcr_pid);
1815 set_pcr_pid(ts->stream, h->id, pcr_pid);
1817 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1819 program_info_length = get16(&p, p_end);
1820 if (program_info_length < 0)
1822 program_info_length &= 0xfff;
1823 while (program_info_length >= 2) {
1825 tag = get8(&p, p_end);
1826 len = get8(&p, p_end);
1828 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1830 if (len > program_info_length - 2)
1831 // something else is broken, exit the program_descriptors_loop
1833 program_info_length -= len + 2;
1834 if (tag == 0x1d) { // IOD descriptor
1835 get8(&p, p_end); // scope
1836 get8(&p, p_end); // label
1838 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1839 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1840 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1841 prog_reg_desc = bytestream_get_le32(&p);
1846 p += program_info_length;
1850 // stop parsing after pmt, we found header
1851 if (!ts->stream->nb_streams)
1854 set_pmt_found(ts, h->id);
1860 stream_type = get8(&p, p_end);
1861 if (stream_type < 0)
1863 pid = get16(&p, p_end);
1867 if (pid == ts->current_pid)
1870 /* now create stream */
1871 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1872 pes = ts->pids[pid]->u.pes_filter.opaque;
1874 pes->st = avformat_new_stream(pes->stream, NULL);
1877 pes->st->id = pes->pid;
1880 } else if (stream_type != 0x13) {
1882 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1883 pes = add_pes_stream(ts, pid, pcr_pid);
1885 st = avformat_new_stream(pes->stream, NULL);
1891 int idx = ff_find_stream_index(ts->stream, pid);
1893 st = ts->stream->streams[idx];
1895 st = avformat_new_stream(ts->stream, NULL);
1899 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1906 if (pes && !pes->stream_type)
1907 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1909 add_pid_to_pmt(ts, h->id, pid);
1911 ff_program_add_stream_index(ts->stream, h->id, st->index);
1913 desc_list_len = get16(&p, p_end);
1914 if (desc_list_len < 0)
1916 desc_list_len &= 0xfff;
1917 desc_list_end = p + desc_list_len;
1918 if (desc_list_end > p_end)
1921 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1922 desc_list_end, mp4_descr,
1923 mp4_descr_count, pid, ts) < 0)
1926 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1927 stream_type == 0x83 && pes->sub_st) {
1928 ff_program_add_stream_index(ts->stream, h->id,
1929 pes->sub_st->index);
1930 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1936 if (!ts->pids[pcr_pid])
1937 mpegts_open_pcr_filter(ts, pcr_pid);
1940 for (i = 0; i < mp4_descr_count; i++)
1941 av_free(mp4_descr[i].dec_config_descr);
1944 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1946 MpegTSContext *ts = filter->u.section_filter.opaque;
1947 SectionHeader h1, *h = &h1;
1948 const uint8_t *p, *p_end;
1952 av_dlog(ts->stream, "PAT:\n");
1953 hex_dump_debug(ts->stream, section, section_len);
1955 p_end = section + section_len - 4;
1957 if (parse_section_header(h, &p, p_end) < 0)
1959 if (h->tid != PAT_TID)
1961 if (ts->skip_changes)
1964 ts->stream->ts_id = h->id;
1968 sid = get16(&p, p_end);
1971 pmt_pid = get16(&p, p_end);
1976 if (pmt_pid == ts->current_pid)
1979 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1981 if (sid == 0x0000) {
1984 MpegTSFilter *fil = ts->pids[pmt_pid];
1985 program = av_new_program(ts->stream, sid);
1987 program->program_num = sid;
1988 program->pmt_pid = pmt_pid;
1991 if ( fil->type != MPEGTS_SECTION
1992 || fil->pid != pmt_pid
1993 || fil->u.section_filter.section_cb != pmt_cb)
1994 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1996 if (!ts->pids[pmt_pid])
1997 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1998 add_pat_entry(ts, sid);
1999 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2000 add_pid_to_pmt(ts, sid, pmt_pid);
2006 for (j=0; j<ts->stream->nb_programs; j++) {
2007 for (i = 0; i < ts->nb_prg; i++)
2008 if (ts->prg[i].id == ts->stream->programs[j]->id)
2010 if (i==ts->nb_prg && !ts->skip_clear)
2011 clear_avprogram(ts, ts->stream->programs[j]->id);
2016 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2018 MpegTSContext *ts = filter->u.section_filter.opaque;
2019 SectionHeader h1, *h = &h1;
2020 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2021 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2022 char *name, *provider_name;
2024 av_dlog(ts->stream, "SDT:\n");
2025 hex_dump_debug(ts->stream, section, section_len);
2027 p_end = section + section_len - 4;
2029 if (parse_section_header(h, &p, p_end) < 0)
2031 if (h->tid != SDT_TID)
2033 if (ts->skip_changes)
2035 onid = get16(&p, p_end);
2038 val = get8(&p, p_end);
2042 sid = get16(&p, p_end);
2045 val = get8(&p, p_end);
2048 desc_list_len = get16(&p, p_end);
2049 if (desc_list_len < 0)
2051 desc_list_len &= 0xfff;
2052 desc_list_end = p + desc_list_len;
2053 if (desc_list_end > p_end)
2056 desc_tag = get8(&p, desc_list_end);
2059 desc_len = get8(&p, desc_list_end);
2060 desc_end = p + desc_len;
2061 if (desc_len < 0 || desc_end > desc_list_end)
2064 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
2065 desc_tag, desc_len);
2069 service_type = get8(&p, p_end);
2070 if (service_type < 0)
2072 provider_name = getstr8(&p, p_end);
2075 name = getstr8(&p, p_end);
2077 AVProgram *program = av_new_program(ts->stream, sid);
2079 av_dict_set(&program->metadata, "service_name", name, 0);
2080 av_dict_set(&program->metadata, "service_provider",
2085 av_free(provider_name);
2096 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2097 const uint8_t *packet);
2099 /* handle one TS packet */
2100 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2103 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2104 has_adaptation, has_payload;
2105 const uint8_t *p, *p_end;
2108 pid = AV_RB16(packet + 1) & 0x1fff;
2109 if (pid && discard_pid(ts, pid))
2111 is_start = packet[1] & 0x40;
2112 tss = ts->pids[pid];
2113 if (ts->auto_guess && !tss && is_start) {
2114 add_pes_stream(ts, pid, -1);
2115 tss = ts->pids[pid];
2119 ts->current_pid = pid;
2121 afc = (packet[3] >> 4) & 3;
2122 if (afc == 0) /* reserved value */
2124 has_adaptation = afc & 2;
2125 has_payload = afc & 1;
2126 is_discontinuity = has_adaptation &&
2127 packet[4] != 0 && /* with length > 0 */
2128 (packet[5] & 0x80); /* and discontinuity indicated */
2130 /* continuity check (currently not used) */
2131 cc = (packet[3] & 0xf);
2132 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2133 cc_ok = pid == 0x1FFF || // null packet PID
2140 av_log(ts->stream, AV_LOG_DEBUG,
2141 "Continuity check failed for pid %d expected %d got %d\n",
2142 pid, expected_cc, cc);
2143 if (tss->type == MPEGTS_PES) {
2144 PESContext *pc = tss->u.pes_filter.opaque;
2145 pc->flags |= AV_PKT_FLAG_CORRUPT;
2150 if (has_adaptation) {
2153 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2154 tss->last_pcr = pcr_h * 300 + pcr_l;
2155 /* skip adaptation field */
2158 /* if past the end of packet, ignore */
2159 p_end = packet + TS_PACKET_SIZE;
2160 if (p >= p_end || !has_payload)
2163 pos = avio_tell(ts->stream->pb);
2165 av_assert0(pos >= TS_PACKET_SIZE);
2166 ts->pos47_full = pos - TS_PACKET_SIZE;
2169 if (tss->type == MPEGTS_SECTION) {
2171 /* pointer field present */
2173 if (p + len > p_end)
2176 /* write remaining section bytes */
2177 write_section_data(ts, tss,
2179 /* check whether filter has been closed */
2185 write_section_data(ts, tss,
2190 write_section_data(ts, tss,
2195 // stop find_stream_info from waiting for more streams
2196 // when all programs have received a PMT
2197 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2199 for (i = 0; i < ts->nb_prg; i++) {
2200 if (!ts->prg[i].pmt_found)
2203 if (i == ts->nb_prg && ts->nb_prg > 0) {
2204 if (ts->stream->nb_streams > 1 || pos > 100000) {
2205 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2206 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2213 // Note: The position here points actually behind the current packet.
2214 if (tss->type == MPEGTS_PES) {
2215 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2216 pos - ts->raw_packet_size)) < 0)
2224 static void reanalyze(MpegTSContext *ts) {
2225 AVIOContext *pb = ts->stream->pb;
2226 int64_t pos = avio_tell(pb);
2229 pos -= ts->pos47_full;
2230 if (pos == TS_PACKET_SIZE) {
2231 ts->size_stat[0] ++;
2232 } else if (pos == TS_DVHS_PACKET_SIZE) {
2233 ts->size_stat[1] ++;
2234 } else if (pos == TS_FEC_PACKET_SIZE) {
2235 ts->size_stat[2] ++;
2238 ts->size_stat_count ++;
2239 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2241 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2242 newsize = TS_PACKET_SIZE;
2243 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2244 newsize = TS_DVHS_PACKET_SIZE;
2245 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2246 newsize = TS_FEC_PACKET_SIZE;
2248 if (newsize && newsize != ts->raw_packet_size) {
2249 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2250 ts->raw_packet_size = newsize;
2252 ts->size_stat_count = 0;
2253 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2257 /* XXX: try to find a better synchro over several packets (use
2258 * get_packet_size() ?) */
2259 static int mpegts_resync(AVFormatContext *s)
2261 MpegTSContext *ts = s->priv_data;
2262 AVIOContext *pb = s->pb;
2265 for (i = 0; i < ts->resync_size; i++) {
2270 avio_seek(pb, -1, SEEK_CUR);
2271 reanalyze(s->priv_data);
2275 av_log(s, AV_LOG_ERROR,
2276 "max resync size reached, could not find sync byte\n");
2278 return AVERROR_INVALIDDATA;
2281 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2282 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2283 const uint8_t **data)
2285 AVIOContext *pb = s->pb;
2289 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2290 if (len != TS_PACKET_SIZE)
2291 return len < 0 ? len : AVERROR_EOF;
2292 /* check packet sync byte */
2293 if ((*data)[0] != 0x47) {
2294 /* find a new packet start */
2295 uint64_t pos = avio_tell(pb);
2296 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2298 if (mpegts_resync(s) < 0)
2299 return AVERROR(EAGAIN);
2309 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2311 AVIOContext *pb = s->pb;
2312 int skip = raw_packet_size - TS_PACKET_SIZE;
2314 avio_skip(pb, skip);
2317 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2319 AVFormatContext *s = ts->stream;
2320 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2321 const uint8_t *data;
2325 if (avio_tell(s->pb) != ts->last_pos) {
2327 av_dlog(ts->stream, "Skipping after seek\n");
2328 /* seek detected, flush pes buffer */
2329 for (i = 0; i < NB_PID_MAX; i++) {
2331 if (ts->pids[i]->type == MPEGTS_PES) {
2332 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2333 av_buffer_unref(&pes->buffer);
2334 pes->data_index = 0;
2335 pes->state = MPEGTS_SKIP; /* skip until pes header */
2337 ts->pids[i]->last_cc = -1;
2338 ts->pids[i]->last_pcr = -1;
2345 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2348 if (nb_packets != 0 && packet_num >= nb_packets ||
2349 ts->stop_parse > 1) {
2350 ret = AVERROR(EAGAIN);
2353 if (ts->stop_parse > 0)
2356 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2359 ret = handle_packet(ts, data);
2360 finished_reading_packet(s, ts->raw_packet_size);
2364 ts->last_pos = avio_tell(s->pb);
2368 static int mpegts_probe(AVProbeData *p)
2370 const int size = p->buf_size;
2374 int check_count = size / TS_FEC_PACKET_SIZE;
2375 #define CHECK_COUNT 10
2376 #define CHECK_BLOCK 100
2378 if (check_count < CHECK_COUNT)
2379 return AVERROR_INVALIDDATA;
2381 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2382 int left = FFMIN(check_count - i, CHECK_BLOCK);
2383 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2384 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2385 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2386 score = FFMAX3(score, dvhs_score, fec_score);
2388 maxscore = FFMAX(maxscore, score);
2391 sumscore = sumscore * CHECK_COUNT / check_count;
2392 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2394 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2396 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2397 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2399 return AVERROR_INVALIDDATA;
2402 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2403 * (-1) if not available */
2404 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2406 int afc, len, flags;
2410 afc = (packet[3] >> 4) & 3;
2412 return AVERROR_INVALIDDATA;
2417 return AVERROR_INVALIDDATA;
2420 if (!(flags & 0x10))
2421 return AVERROR_INVALIDDATA;
2423 return AVERROR_INVALIDDATA;
2425 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2426 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2430 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2432 /* NOTE: We attempt to seek on non-seekable files as well, as the
2433 * probe buffer usually is big enough. Only warn if the seek failed
2434 * on files where the seek should work. */
2435 if (avio_seek(pb, pos, SEEK_SET) < 0)
2436 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2439 static int mpegts_read_header(AVFormatContext *s)
2441 MpegTSContext *ts = s->priv_data;
2442 AVIOContext *pb = s->pb;
2443 uint8_t buf[8 * 1024] = {0};
2445 int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2447 ffio_ensure_seekback(pb, probesize);
2449 /* read the first 8192 bytes to get packet size */
2450 pos = avio_tell(pb);
2451 len = avio_read(pb, buf, sizeof(buf));
2452 ts->raw_packet_size = get_packet_size(buf, len);
2453 if (ts->raw_packet_size <= 0) {
2454 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2455 ts->raw_packet_size = TS_PACKET_SIZE;
2460 if (s->iformat == &ff_mpegts_demuxer) {
2463 /* first do a scan to get all the services */
2464 seek_back(s, pb, pos);
2466 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2468 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2470 handle_packets(ts, probesize / ts->raw_packet_size);
2471 /* if could not find service, enable auto_guess */
2475 av_dlog(ts->stream, "tuning done\n");
2477 s->ctx_flags |= AVFMTCTX_NOHEADER;
2480 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2481 int64_t pcrs[2], pcr_h;
2482 int packet_count[2];
2483 uint8_t packet[TS_PACKET_SIZE];
2484 const uint8_t *data;
2486 /* only read packets */
2488 st = avformat_new_stream(s, NULL);
2490 return AVERROR(ENOMEM);
2491 avpriv_set_pts_info(st, 60, 1, 27000000);
2492 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2493 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2495 /* we iterate until we find two PCRs to estimate the bitrate */
2500 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2503 pid = AV_RB16(data + 1) & 0x1fff;
2504 if ((pcr_pid == -1 || pcr_pid == pid) &&
2505 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2506 finished_reading_packet(s, ts->raw_packet_size);
2508 packet_count[nb_pcrs] = nb_packets;
2509 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2514 finished_reading_packet(s, ts->raw_packet_size);
2519 /* NOTE1: the bitrate is computed without the FEC */
2520 /* NOTE2: it is only the bitrate of the start of the stream */
2521 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2522 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2523 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2524 st->codec->bit_rate = s->bit_rate;
2525 st->start_time = ts->cur_pcr;
2526 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2527 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2530 seek_back(s, pb, pos);
2534 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2536 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2538 MpegTSContext *ts = s->priv_data;
2540 int64_t pcr_h, next_pcr_h, pos;
2541 int pcr_l, next_pcr_l;
2542 uint8_t pcr_buf[12];
2543 const uint8_t *data;
2545 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2546 return AVERROR(ENOMEM);
2547 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2548 pkt->pos = avio_tell(s->pb);
2550 av_free_packet(pkt);
2553 if (data != pkt->data)
2554 memcpy(pkt->data, data, ts->raw_packet_size);
2555 finished_reading_packet(s, ts->raw_packet_size);
2556 if (ts->mpeg2ts_compute_pcr) {
2557 /* compute exact PCR for each packet */
2558 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2559 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2560 pos = avio_tell(s->pb);
2561 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2562 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2563 avio_read(s->pb, pcr_buf, 12);
2564 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2565 /* XXX: not precise enough */
2567 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2572 avio_seek(s->pb, pos, SEEK_SET);
2573 /* no next PCR found: we use previous increment */
2574 ts->cur_pcr = pcr_h * 300 + pcr_l;
2576 pkt->pts = ts->cur_pcr;
2577 pkt->duration = ts->pcr_incr;
2578 ts->cur_pcr += ts->pcr_incr;
2580 pkt->stream_index = 0;
2584 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2586 MpegTSContext *ts = s->priv_data;
2591 ret = handle_packets(ts, 0);
2593 av_free_packet(ts->pkt);
2594 /* flush pes data left */
2595 for (i = 0; i < NB_PID_MAX; i++)
2596 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2597 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2598 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2599 new_pes_packet(pes, pkt);
2600 pes->state = MPEGTS_SKIP;
2607 if (!ret && pkt->size < 0)
2608 ret = AVERROR(EINTR);
2612 static void mpegts_free(MpegTSContext *ts)
2618 for (i = 0; i < NB_PID_MAX; i++)
2620 mpegts_close_filter(ts, ts->pids[i]);
2623 static int mpegts_read_close(AVFormatContext *s)
2625 MpegTSContext *ts = s->priv_data;
2630 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2631 int64_t *ppos, int64_t pos_limit)
2633 MpegTSContext *ts = s->priv_data;
2634 int64_t pos, timestamp;
2635 uint8_t buf[TS_PACKET_SIZE];
2636 int pcr_l, pcr_pid =
2637 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2638 int pos47 = ts->pos47_full % ts->raw_packet_size;
2640 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2641 ts->raw_packet_size + pos47;
2642 while(pos < pos_limit) {
2643 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2644 return AV_NOPTS_VALUE;
2645 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2646 return AV_NOPTS_VALUE;
2647 if (buf[0] != 0x47) {
2648 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2649 if (mpegts_resync(s) < 0)
2650 return AV_NOPTS_VALUE;
2651 pos = avio_tell(s->pb);
2654 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2655 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2659 pos += ts->raw_packet_size;
2662 return AV_NOPTS_VALUE;
2665 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2666 int64_t *ppos, int64_t pos_limit)
2668 MpegTSContext *ts = s->priv_data;
2670 int pos47 = ts->pos47_full % ts->raw_packet_size;
2671 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2672 ff_read_frame_flush(s);
2673 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2674 return AV_NOPTS_VALUE;
2675 while(pos < pos_limit) {
2678 av_init_packet(&pkt);
2679 ret = av_read_frame(s, &pkt);
2681 return AV_NOPTS_VALUE;
2682 av_free_packet(&pkt);
2683 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2684 ff_reduce_index(s, pkt.stream_index);
2685 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2686 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2694 return AV_NOPTS_VALUE;
2697 /**************************************************************/
2698 /* parsing functions - called from other demuxers such as RTP */
2700 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
2704 ts = av_mallocz(sizeof(MpegTSContext));
2707 /* no stream case, currently used by RTP */
2708 ts->raw_packet_size = TS_PACKET_SIZE;
2711 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2712 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2717 /* return the consumed length if a packet was output, or -1 if no
2718 * packet is output */
2719 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2720 const uint8_t *buf, int len)
2728 if (len < TS_PACKET_SIZE)
2729 return AVERROR_INVALIDDATA;
2730 if (buf[0] != 0x47) {
2734 handle_packet(ts, buf);
2735 buf += TS_PACKET_SIZE;
2736 len -= TS_PACKET_SIZE;
2737 if (ts->stop_parse == 1)
2744 void avpriv_mpegts_parse_close(MpegTSContext *ts)
2750 AVInputFormat ff_mpegts_demuxer = {
2752 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2753 .priv_data_size = sizeof(MpegTSContext),
2754 .read_probe = mpegts_probe,
2755 .read_header = mpegts_read_header,
2756 .read_packet = mpegts_read_packet,
2757 .read_close = mpegts_read_close,
2758 .read_timestamp = mpegts_get_dts,
2759 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2760 .priv_class = &mpegts_class,
2763 AVInputFormat ff_mpegtsraw_demuxer = {
2764 .name = "mpegtsraw",
2765 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2766 .priv_data_size = sizeof(MpegTSContext),
2767 .read_header = mpegts_read_header,
2768 .read_packet = mpegts_raw_read_packet,
2769 .read_close = mpegts_read_close,
2770 .read_timestamp = mpegts_get_dts,
2771 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2772 .priv_class = &mpegtsraw_class,