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"
40 /* maximum size in which we look for synchronisation if
41 * synchronisation is lost */
42 #define MAX_RESYNC_SIZE 65536
44 #define MAX_PES_PAYLOAD 200 * 1024
46 #define MAX_MP4_DESCR_COUNT 16
48 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
50 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
51 (modulus) = (dividend) % (divisor); \
52 (prev_dividend) = (dividend); \
55 enum MpegTSFilterType {
61 typedef struct MpegTSFilter MpegTSFilter;
63 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
64 int is_start, int64_t pos);
66 typedef struct MpegTSPESFilter {
71 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
73 typedef void SetServiceCallback (void *opaque, int ret);
75 typedef struct MpegTSSectionFilter {
82 unsigned int check_crc : 1;
83 unsigned int end_of_section_reached : 1;
84 SectionCallback *section_cb;
86 } MpegTSSectionFilter;
91 int last_cc; /* last cc code (-1 if first packet) */
93 enum MpegTSFilterType type;
95 MpegTSPESFilter pes_filter;
96 MpegTSSectionFilter section_filter;
100 #define MAX_PIDS_PER_PROGRAM 64
102 unsigned int id; // program id/service id
103 unsigned int nb_pids;
104 unsigned int pids[MAX_PIDS_PER_PROGRAM];
106 /** have we found pmt for this program */
110 struct MpegTSContext {
111 const AVClass *class;
113 AVFormatContext *stream;
114 /** raw packet size, including FEC if present */
119 #define SIZE_STAT_THRESHOLD 10
123 /** if true, all pids are analyzed to find streams */
126 /** compute exact PCR for each transport stream packet */
127 int mpeg2ts_compute_pcr;
129 /** fix dvb teletext pts */
130 int fix_teletext_pts;
132 int64_t cur_pcr; /**< used to estimate the exact PCR */
133 int pcr_incr; /**< used to estimate the exact PCR */
135 /* data needed to handle file based ts */
136 /** stop parsing loop */
138 /** packet containing Audio/Video data */
140 /** to detect seek */
150 /******************************************/
151 /* private mpegts data */
153 /** structure to keep track of Program->pids mapping */
157 int8_t crc_validity[NB_PID_MAX];
158 /** filters for various streams specified by PMT + for the PAT and PMT */
159 MpegTSFilter *pids[NB_PID_MAX];
163 #define MPEGTS_OPTIONS \
164 { "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 }
166 static const AVOption options[] = {
168 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
169 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
170 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
171 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
172 {"scan_all_pmts", "Scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_INT,
173 { .i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
174 {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
175 {.i64 = 0}, 0, 1, 0 },
176 {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
177 {.i64 = 0}, 0, 1, 0 },
181 static const AVClass mpegts_class = {
182 .class_name = "mpegts demuxer",
183 .item_name = av_default_item_name,
185 .version = LIBAVUTIL_VERSION_INT,
188 static const AVOption raw_options[] = {
190 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
191 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
192 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
193 { "ts_packetsize", "Output option carrying the raw packet size.",
194 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
196 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
200 static const AVClass mpegtsraw_class = {
201 .class_name = "mpegtsraw demuxer",
202 .item_name = av_default_item_name,
203 .option = raw_options,
204 .version = LIBAVUTIL_VERSION_INT,
207 /* TS stream handling */
212 MPEGTS_PESHEADER_FILL,
217 /* enough for PES header + length */
218 #define PES_START_SIZE 6
219 #define PES_HEADER_SIZE 9
220 #define MAX_PES_HEADER_SIZE (9 + 255)
222 typedef struct PESContext {
224 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
227 AVFormatContext *stream;
229 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
230 enum MpegTSState state;
231 /* used to get the format */
233 int flags; /**< copied to the AVPacket flags */
236 int extended_stream_id;
238 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
239 uint8_t header[MAX_PES_HEADER_SIZE];
244 extern AVInputFormat ff_mpegts_demuxer;
246 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
249 for (i = 0; i < ts->nb_prg; i++) {
250 if (ts->prg[i].id == programid) {
257 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
259 AVProgram *prg = NULL;
262 for (i = 0; i < ts->stream->nb_programs; i++)
263 if (ts->stream->programs[i]->id == programid) {
264 prg = ts->stream->programs[i];
269 prg->nb_stream_indexes = 0;
272 static void clear_program(MpegTSContext *ts, unsigned int programid)
276 clear_avprogram(ts, programid);
277 for (i = 0; i < ts->nb_prg; i++)
278 if (ts->prg[i].id == programid) {
279 ts->prg[i].nb_pids = 0;
280 ts->prg[i].pmt_found = 0;
284 static void clear_programs(MpegTSContext *ts)
290 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
293 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
297 p = &ts->prg[ts->nb_prg];
304 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
307 struct Program *p = get_program(ts, programid);
312 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
315 for (i = 0; i < p->nb_pids; i++)
316 if (p->pids[i] == pid)
319 p->pids[p->nb_pids++] = pid;
322 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
324 struct Program *p = get_program(ts, programid);
331 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
334 for (i = 0; i < s->nb_programs; i++) {
335 if (s->programs[i]->id == programid) {
336 s->programs[i]->pcr_pid = pid;
343 * @brief discard_pid() decides if the pid is to be discarded according
344 * to caller's programs selection
345 * @param ts : - TS context
347 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
350 static int discard_pid(MpegTSContext *ts, unsigned int pid)
353 int used = 0, discarded = 0;
356 /* If none of the programs have .discard=AVDISCARD_ALL then there's
357 * no way we have to discard this packet */
358 for (k = 0; k < ts->stream->nb_programs; k++)
359 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
361 if (k == ts->stream->nb_programs)
364 for (i = 0; i < ts->nb_prg; i++) {
366 for (j = 0; j < p->nb_pids; j++) {
367 if (p->pids[j] != pid)
369 // is program with id p->id set to be discarded?
370 for (k = 0; k < ts->stream->nb_programs; k++) {
371 if (ts->stream->programs[k]->id == p->id) {
372 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
381 return !used && discarded;
385 * Assemble PES packets out of TS packets, and then call the "section_cb"
386 * function when they are complete.
388 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
389 const uint8_t *buf, int buf_size, int is_start)
391 MpegTSSectionFilter *tss = &tss1->u.section_filter;
395 memcpy(tss->section_buf, buf, buf_size);
396 tss->section_index = buf_size;
397 tss->section_h_size = -1;
398 tss->end_of_section_reached = 0;
400 if (tss->end_of_section_reached)
402 len = 4096 - tss->section_index;
405 memcpy(tss->section_buf + tss->section_index, buf, len);
406 tss->section_index += len;
409 /* compute section length if possible */
410 if (tss->section_h_size == -1 && tss->section_index >= 3) {
411 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
414 tss->section_h_size = len;
417 if (tss->section_h_size != -1 &&
418 tss->section_index >= tss->section_h_size) {
420 tss->end_of_section_reached = 1;
422 if (tss->check_crc) {
423 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
424 if (tss->section_h_size >= 4)
425 tss->crc = AV_RB32(tss->section_buf + tss->section_h_size - 4);
428 ts->crc_validity[ tss1->pid ] = 100;
429 }else if (ts->crc_validity[ tss1->pid ] > -10) {
430 ts->crc_validity[ tss1->pid ]--;
435 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
442 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
443 enum MpegTSFilterType type)
445 MpegTSFilter *filter;
447 av_log(ts->stream, AV_LOG_TRACE, "Filter: pid=0x%x\n", pid);
449 if (pid >= NB_PID_MAX || ts->pids[pid])
451 filter = av_mallocz(sizeof(MpegTSFilter));
454 ts->pids[pid] = filter;
459 filter->last_cc = -1;
460 filter->last_pcr= -1;
465 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
467 SectionCallback *section_cb,
471 MpegTSFilter *filter;
472 MpegTSSectionFilter *sec;
474 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
476 sec = &filter->u.section_filter;
477 sec->section_cb = section_cb;
478 sec->opaque = opaque;
479 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
480 sec->check_crc = check_crc;
483 if (!sec->section_buf) {
490 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
494 MpegTSFilter *filter;
495 MpegTSPESFilter *pes;
497 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
500 pes = &filter->u.pes_filter;
501 pes->pes_cb = pes_cb;
502 pes->opaque = opaque;
506 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
508 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
511 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
516 if (filter->type == MPEGTS_SECTION)
517 av_freep(&filter->u.section_filter.section_buf);
518 else if (filter->type == MPEGTS_PES) {
519 PESContext *pes = filter->u.pes_filter.opaque;
520 av_buffer_unref(&pes->buffer);
521 /* referenced private data will be freed later in
522 * avformat_close_input */
523 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
524 av_freep(&filter->u.pes_filter.opaque);
529 ts->pids[pid] = NULL;
532 static int analyze(const uint8_t *buf, int size, int packet_size, int *index,
535 int stat[TS_MAX_PACKET_SIZE];
540 memset(stat, 0, packet_size * sizeof(*stat));
542 for (i = 0; i < size - 3; i++) {
543 if (buf[i] == 0x47 &&
544 (!probe || (!(buf[i + 1] & 0x80) && buf[i + 3] != 0x47))) {
545 int x = i % packet_size;
548 if (stat[x] > best_score) {
549 best_score = stat[x];
556 return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
559 /* autodetect fec presence. Must have at least 1024 bytes */
560 static int get_packet_size(const uint8_t *buf, int size)
562 int score, fec_score, dvhs_score;
564 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
565 return AVERROR_INVALIDDATA;
567 score = analyze(buf, size, TS_PACKET_SIZE, NULL, 0);
568 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL, 0);
569 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL, 0);
570 av_log(NULL, AV_LOG_TRACE, "score: %d, dvhs_score: %d, fec_score: %d \n",
571 score, dvhs_score, fec_score);
573 if (score > fec_score && score > dvhs_score)
574 return TS_PACKET_SIZE;
575 else if (dvhs_score > score && dvhs_score > fec_score)
576 return TS_DVHS_PACKET_SIZE;
577 else if (score < fec_score && dvhs_score < fec_score)
578 return TS_FEC_PACKET_SIZE;
580 return AVERROR_INVALIDDATA;
583 typedef struct SectionHeader {
588 uint8_t last_sec_num;
591 static int skip_identical(const SectionHeader *h, MpegTSSectionFilter *tssf)
593 if (h->version == tssf->last_ver && tssf->last_crc == tssf->crc)
596 tssf->last_ver = h->version;
597 tssf->last_crc = tssf->crc;
602 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
609 return AVERROR_INVALIDDATA;
615 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
622 return AVERROR_INVALIDDATA;
629 /* read and allocate a DVB string preceded by its length */
630 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
637 len = get8(&p, p_end);
642 str = av_malloc(len + 1);
652 static int parse_section_header(SectionHeader *h,
653 const uint8_t **pp, const uint8_t *p_end)
657 val = get8(pp, p_end);
662 val = get16(pp, p_end);
666 val = get8(pp, p_end);
669 h->version = (val >> 1) & 0x1f;
670 val = get8(pp, p_end);
674 val = get8(pp, p_end);
677 h->last_sec_num = val;
681 typedef struct StreamType {
682 uint32_t stream_type;
683 enum AVMediaType codec_type;
684 enum AVCodecID codec_id;
687 static const StreamType ISO_types[] = {
688 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
689 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
690 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
691 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
692 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
693 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
694 /* Makito encoder sets stream type 0x11 for AAC,
695 * so auto-detect LOAS/LATM instead of hardcoding it. */
696 #if !CONFIG_LOAS_DEMUXER
697 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
699 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
700 { 0x20, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
701 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
702 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
703 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
704 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
708 static const StreamType HDMV_types[] = {
709 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
710 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
711 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
712 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
713 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
714 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
715 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
716 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
717 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
718 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
723 static const StreamType MISC_types[] = {
724 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
725 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
729 static const StreamType REGD_types[] = {
730 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
731 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
732 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
733 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
734 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
735 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
736 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
737 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
738 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
739 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
743 static const StreamType METADATA_types[] = {
744 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
745 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
749 /* descriptor present */
750 static const StreamType DESC_types[] = {
751 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
752 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
753 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
754 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
755 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
759 static void mpegts_find_stream_type(AVStream *st,
760 uint32_t stream_type,
761 const StreamType *types)
763 if (avcodec_is_open(st->codec)) {
764 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
768 for (; types->stream_type; types++)
769 if (stream_type == types->stream_type) {
770 st->codec->codec_type = types->codec_type;
771 st->codec->codec_id = types->codec_id;
772 st->request_probe = 0;
777 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
778 uint32_t stream_type, uint32_t prog_reg_desc)
780 int old_codec_type = st->codec->codec_type;
781 int old_codec_id = st->codec->codec_id;
783 if (avcodec_is_open(st->codec)) {
784 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
788 avpriv_set_pts_info(st, 33, 1, 90000);
790 st->codec->codec_type = AVMEDIA_TYPE_DATA;
791 st->codec->codec_id = AV_CODEC_ID_NONE;
792 st->need_parsing = AVSTREAM_PARSE_FULL;
794 pes->stream_type = stream_type;
796 av_log(pes->stream, AV_LOG_DEBUG,
797 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
798 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
800 st->codec->codec_tag = pes->stream_type;
802 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
803 if ((prog_reg_desc == AV_RL32("HDMV") ||
804 prog_reg_desc == AV_RL32("HDPR")) &&
805 st->codec->codec_id == AV_CODEC_ID_NONE) {
806 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
807 if (pes->stream_type == 0x83) {
808 // HDMV TrueHD streams also contain an AC3 coded version of the
809 // audio track - add a second stream for this
811 // priv_data cannot be shared between streams
812 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
814 return AVERROR(ENOMEM);
815 memcpy(sub_pes, pes, sizeof(*sub_pes));
817 sub_st = avformat_new_stream(pes->stream, NULL);
820 return AVERROR(ENOMEM);
823 sub_st->id = pes->pid;
824 avpriv_set_pts_info(sub_st, 33, 1, 90000);
825 sub_st->priv_data = sub_pes;
826 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
827 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
828 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
829 sub_pes->sub_st = pes->sub_st = sub_st;
832 if (st->codec->codec_id == AV_CODEC_ID_NONE)
833 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
834 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
835 st->codec->codec_id = old_codec_id;
836 st->codec->codec_type = old_codec_type;
842 static void reset_pes_packet_state(PESContext *pes)
844 pes->pts = AV_NOPTS_VALUE;
845 pes->dts = AV_NOPTS_VALUE;
848 av_buffer_unref(&pes->buffer);
851 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
855 pkt->buf = pes->buffer;
856 pkt->data = pes->buffer->data;
857 pkt->size = pes->data_index;
859 if (pes->total_size != MAX_PES_PAYLOAD &&
860 pes->pes_header_size + pes->data_index != pes->total_size +
862 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
863 pes->flags |= AV_PKT_FLAG_CORRUPT;
865 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
867 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
868 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
869 pkt->stream_index = pes->sub_st->index;
871 pkt->stream_index = pes->st->index;
874 /* store position of first TS packet of this PES packet */
875 pkt->pos = pes->ts_packet_pos;
876 pkt->flags = pes->flags;
879 reset_pes_packet_state(pes);
882 static uint64_t get_ts64(GetBitContext *gb, int bits)
884 if (get_bits_left(gb) < bits)
885 return AV_NOPTS_VALUE;
886 return get_bits64(gb, bits);
889 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
890 const uint8_t *buf, int buf_size)
893 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
894 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
895 int dts_flag = -1, cts_flag = -1;
896 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
897 uint8_t buf_padded[128 + FF_INPUT_BUFFER_PADDING_SIZE];
898 int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - FF_INPUT_BUFFER_PADDING_SIZE);
900 memcpy(buf_padded, buf, buf_padded_size);
902 init_get_bits(&gb, buf_padded, buf_padded_size * 8);
904 if (sl->use_au_start)
905 au_start_flag = get_bits1(&gb);
907 au_end_flag = get_bits1(&gb);
908 if (!sl->use_au_start && !sl->use_au_end)
909 au_start_flag = au_end_flag = 1;
911 ocr_flag = get_bits1(&gb);
913 idle_flag = get_bits1(&gb);
915 padding_flag = get_bits1(&gb);
917 padding_bits = get_bits(&gb, 3);
919 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
920 if (sl->packet_seq_num_len)
921 skip_bits_long(&gb, sl->packet_seq_num_len);
922 if (sl->degr_prior_len)
924 skip_bits(&gb, sl->degr_prior_len);
926 skip_bits_long(&gb, sl->ocr_len);
928 if (sl->use_rand_acc_pt)
930 if (sl->au_seq_num_len > 0)
931 skip_bits_long(&gb, sl->au_seq_num_len);
932 if (sl->use_timestamps) {
933 dts_flag = get_bits1(&gb);
934 cts_flag = get_bits1(&gb);
937 if (sl->inst_bitrate_len)
938 inst_bitrate_flag = get_bits1(&gb);
940 dts = get_ts64(&gb, sl->timestamp_len);
942 cts = get_ts64(&gb, sl->timestamp_len);
944 skip_bits_long(&gb, sl->au_len);
945 if (inst_bitrate_flag)
946 skip_bits_long(&gb, sl->inst_bitrate_len);
949 if (dts != AV_NOPTS_VALUE)
951 if (cts != AV_NOPTS_VALUE)
954 if (sl->timestamp_len && sl->timestamp_res)
955 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
957 return (get_bits_count(&gb) + 7) >> 3;
960 /* return non zero if a packet could be constructed */
961 static int mpegts_push_data(MpegTSFilter *filter,
962 const uint8_t *buf, int buf_size, int is_start,
965 PESContext *pes = filter->u.pes_filter.opaque;
966 MpegTSContext *ts = pes->ts;
974 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
975 new_pes_packet(pes, ts->pkt);
978 reset_pes_packet_state(pes);
980 pes->state = MPEGTS_HEADER;
981 pes->ts_packet_pos = pos;
984 while (buf_size > 0) {
985 switch (pes->state) {
987 len = PES_START_SIZE - pes->data_index;
990 memcpy(pes->header + pes->data_index, p, len);
991 pes->data_index += len;
994 if (pes->data_index == PES_START_SIZE) {
995 /* we got all the PES or section header. We can now
997 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
998 pes->header[2] == 0x01) {
999 /* it must be an mpeg2 PES stream */
1000 code = pes->header[3] | 0x100;
1001 av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
1004 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
1006 pes->sub_st->discard == AVDISCARD_ALL)) ||
1007 code == 0x1be) /* padding_stream */
1010 /* stream not present in PMT */
1012 if (ts->skip_changes)
1015 pes->st = avformat_new_stream(ts->stream, NULL);
1017 return AVERROR(ENOMEM);
1018 pes->st->id = pes->pid;
1019 mpegts_set_stream_info(pes->st, pes, 0, 0);
1022 pes->total_size = AV_RB16(pes->header + 4);
1023 /* NOTE: a zero total size means the PES size is
1025 if (!pes->total_size)
1026 pes->total_size = MAX_PES_PAYLOAD;
1028 /* allocate pes buffer */
1029 pes->buffer = av_buffer_alloc(pes->total_size +
1030 FF_INPUT_BUFFER_PADDING_SIZE);
1032 return AVERROR(ENOMEM);
1034 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1035 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1036 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1037 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1038 pes->state = MPEGTS_PESHEADER;
1039 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1040 av_log(pes->stream, AV_LOG_TRACE,
1041 "pid=%x stream_type=%x probing\n",
1044 pes->st->request_probe = 1;
1047 pes->state = MPEGTS_PAYLOAD;
1048 pes->data_index = 0;
1051 /* otherwise, it should be a table */
1054 pes->state = MPEGTS_SKIP;
1059 /**********************************************/
1060 /* PES packing parsing */
1061 case MPEGTS_PESHEADER:
1062 len = PES_HEADER_SIZE - pes->data_index;
1064 return AVERROR_INVALIDDATA;
1067 memcpy(pes->header + pes->data_index, p, len);
1068 pes->data_index += len;
1071 if (pes->data_index == PES_HEADER_SIZE) {
1072 pes->pes_header_size = pes->header[8] + 9;
1073 pes->state = MPEGTS_PESHEADER_FILL;
1076 case MPEGTS_PESHEADER_FILL:
1077 len = pes->pes_header_size - pes->data_index;
1079 return AVERROR_INVALIDDATA;
1082 memcpy(pes->header + pes->data_index, p, len);
1083 pes->data_index += len;
1086 if (pes->data_index == pes->pes_header_size) {
1088 unsigned int flags, pes_ext, skip;
1090 flags = pes->header[7];
1091 r = pes->header + 9;
1092 pes->pts = AV_NOPTS_VALUE;
1093 pes->dts = AV_NOPTS_VALUE;
1094 if ((flags & 0xc0) == 0x80) {
1095 pes->dts = pes->pts = ff_parse_pes_pts(r);
1097 } else if ((flags & 0xc0) == 0xc0) {
1098 pes->pts = ff_parse_pes_pts(r);
1100 pes->dts = ff_parse_pes_pts(r);
1103 pes->extended_stream_id = -1;
1104 if (flags & 0x01) { /* PES extension */
1106 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1107 skip = (pes_ext >> 4) & 0xb;
1110 if ((pes_ext & 0x41) == 0x01 &&
1111 (r + 2) <= (pes->header + pes->pes_header_size)) {
1112 /* PES extension 2 */
1113 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1114 pes->extended_stream_id = r[1];
1118 /* we got the full header. We parse it and get the payload */
1119 pes->state = MPEGTS_PAYLOAD;
1120 pes->data_index = 0;
1121 if (pes->stream_type == 0x12 && buf_size > 0) {
1122 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1124 pes->pes_header_size += sl_header_bytes;
1125 p += sl_header_bytes;
1126 buf_size -= sl_header_bytes;
1128 if (pes->stream_type == 0x15 && buf_size >= 5) {
1129 /* skip metadata access unit header */
1130 pes->pes_header_size += 5;
1134 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1135 AVProgram *p = NULL;
1136 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1137 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1138 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1140 AVStream *st = NULL;
1141 if (f->type == MPEGTS_PES) {
1142 PESContext *pcrpes = f->u.pes_filter.opaque;
1145 } else if (f->type == MPEGTS_PCR) {
1147 for (i = 0; i < p->nb_stream_indexes; i++) {
1148 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1149 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1153 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1154 // teletext packets do not always have correct timestamps,
1155 // the standard says they should be handled after 40.6 ms at most,
1156 // and the pcr error to this packet should be no more than 100 ms.
1157 // TODO: we should interpolate the PCR, not just use the last one
1158 int64_t pcr = f->last_pcr / 300;
1159 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1160 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1161 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1162 pes->pts = pes->dts = pcr;
1163 } else if (pes->dts > pcr + 3654 + 9000) {
1164 pes->pts = pes->dts = pcr + 3654 + 9000;
1174 case MPEGTS_PAYLOAD:
1176 if (pes->data_index > 0 &&
1177 pes->data_index + buf_size > pes->total_size) {
1178 new_pes_packet(pes, ts->pkt);
1179 pes->total_size = MAX_PES_PAYLOAD;
1180 pes->buffer = av_buffer_alloc(pes->total_size +
1181 FF_INPUT_BUFFER_PADDING_SIZE);
1183 return AVERROR(ENOMEM);
1185 } else if (pes->data_index == 0 &&
1186 buf_size > pes->total_size) {
1187 // pes packet size is < ts size packet and pes data is padded with 0xff
1188 // not sure if this is legal in ts but see issue #2392
1189 buf_size = pes->total_size;
1191 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1192 pes->data_index += buf_size;
1193 /* emit complete packets with known packet size
1194 * decreases demuxer delay for infrequent packets like subtitles from
1195 * a couple of seconds to milliseconds for properly muxed files.
1196 * total_size is the number of bytes following pes_packet_length
1197 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1198 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1199 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1201 new_pes_packet(pes, ts->pkt);
1215 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1220 /* if no pid found, then add a pid context */
1221 pes = av_mallocz(sizeof(PESContext));
1225 pes->stream = ts->stream;
1227 pes->pcr_pid = pcr_pid;
1228 pes->state = MPEGTS_SKIP;
1229 pes->pts = AV_NOPTS_VALUE;
1230 pes->dts = AV_NOPTS_VALUE;
1231 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1240 typedef struct MP4DescrParseContext {
1244 Mp4Descr *active_descr;
1246 int max_descr_count;
1248 int predefined_SLConfigDescriptor_seen;
1249 } MP4DescrParseContext;
1251 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1252 const uint8_t *buf, unsigned size,
1253 Mp4Descr *descr, int max_descr_count)
1256 if (size > (1 << 30))
1257 return AVERROR_INVALIDDATA;
1259 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1260 NULL, NULL, NULL, NULL)) < 0)
1267 d->active_descr = NULL;
1268 d->max_descr_count = max_descr_count;
1273 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1275 int64_t new_off = avio_tell(pb);
1276 (*len) -= new_off - *off;
1280 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1283 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1286 int ret = parse_mp4_descr(d, off, len, 0);
1289 update_offsets(&d->pb, &off, &len);
1294 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1296 avio_rb16(&d->pb); // ID
1302 update_offsets(&d->pb, &off, &len);
1303 return parse_mp4_descr_arr(d, off, len);
1306 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1311 id_flags = avio_rb16(&d->pb);
1312 if (!(id_flags & 0x0020)) { // URL_Flag
1313 update_offsets(&d->pb, &off, &len);
1314 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1320 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1323 if (d->descr_count >= d->max_descr_count)
1324 return AVERROR_INVALIDDATA;
1325 ff_mp4_parse_es_descr(&d->pb, &es_id);
1326 d->active_descr = d->descr + (d->descr_count++);
1328 d->active_descr->es_id = es_id;
1329 update_offsets(&d->pb, &off, &len);
1330 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1331 update_offsets(&d->pb, &off, &len);
1333 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1334 d->active_descr = NULL;
1338 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1341 Mp4Descr *descr = d->active_descr;
1343 return AVERROR_INVALIDDATA;
1344 d->active_descr->dec_config_descr = av_malloc(len);
1345 if (!descr->dec_config_descr)
1346 return AVERROR(ENOMEM);
1347 descr->dec_config_descr_len = len;
1348 avio_read(&d->pb, descr->dec_config_descr, len);
1352 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1354 Mp4Descr *descr = d->active_descr;
1357 return AVERROR_INVALIDDATA;
1359 predefined = avio_r8(&d->pb);
1362 int flags = avio_r8(&d->pb);
1363 descr->sl.use_au_start = !!(flags & 0x80);
1364 descr->sl.use_au_end = !!(flags & 0x40);
1365 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1366 descr->sl.use_padding = !!(flags & 0x08);
1367 descr->sl.use_timestamps = !!(flags & 0x04);
1368 descr->sl.use_idle = !!(flags & 0x02);
1369 descr->sl.timestamp_res = avio_rb32(&d->pb);
1371 descr->sl.timestamp_len = avio_r8(&d->pb);
1372 if (descr->sl.timestamp_len > 64) {
1373 avpriv_request_sample(NULL, "timestamp_len > 64");
1374 descr->sl.timestamp_len = 64;
1375 return AVERROR_PATCHWELCOME;
1377 descr->sl.ocr_len = avio_r8(&d->pb);
1378 descr->sl.au_len = avio_r8(&d->pb);
1379 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1380 lengths = avio_rb16(&d->pb);
1381 descr->sl.degr_prior_len = lengths >> 12;
1382 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1383 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1384 } else if (!d->predefined_SLConfigDescriptor_seen){
1385 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1386 d->predefined_SLConfigDescriptor_seen = 1;
1391 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1395 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1396 update_offsets(&d->pb, &off, &len);
1397 if (len < 0 || len1 > len || len1 <= 0) {
1398 av_log(d->s, AV_LOG_ERROR,
1399 "Tag %x length violation new length %d bytes remaining %d\n",
1401 return AVERROR_INVALIDDATA;
1404 if (d->level++ >= MAX_LEVEL) {
1405 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1409 if (target_tag && tag != target_tag) {
1410 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1417 parse_MP4IODescrTag(d, off, len1);
1420 parse_MP4ODescrTag(d, off, len1);
1423 parse_MP4ESDescrTag(d, off, len1);
1425 case MP4DecConfigDescrTag:
1426 parse_MP4DecConfigDescrTag(d, off, len1);
1429 parse_MP4SLDescrTag(d, off, len1);
1436 avio_seek(&d->pb, off + len1, SEEK_SET);
1440 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1441 Mp4Descr *descr, int *descr_count, int max_descr_count)
1443 MP4DescrParseContext d;
1446 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1450 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1452 *descr_count = d.descr_count;
1456 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1457 Mp4Descr *descr, int *descr_count, int max_descr_count)
1459 MP4DescrParseContext d;
1462 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1466 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1468 *descr_count = d.descr_count;
1472 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1475 MpegTSContext *ts = filter->u.section_filter.opaque;
1476 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1478 const uint8_t *p, *p_end;
1480 int mp4_descr_count = 0;
1481 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1483 AVFormatContext *s = ts->stream;
1485 p_end = section + section_len - 4;
1487 if (parse_section_header(&h, &p, p_end) < 0)
1489 if (h.tid != M4OD_TID)
1491 if (skip_identical(&h, tssf))
1494 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1495 MAX_MP4_DESCR_COUNT);
1497 for (pid = 0; pid < NB_PID_MAX; pid++) {
1500 for (i = 0; i < mp4_descr_count; i++) {
1503 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1505 if (ts->pids[pid]->type != MPEGTS_PES) {
1506 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1509 pes = ts->pids[pid]->u.pes_filter.opaque;
1514 pes->sl = mp4_descr[i].sl;
1516 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1517 mp4_descr[i].dec_config_descr_len, 0,
1518 NULL, NULL, NULL, NULL);
1519 ff_mp4_read_dec_config_descr(s, st, &pb);
1520 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1521 st->codec->extradata_size > 0)
1522 st->need_parsing = 0;
1523 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1524 st->codec->extradata_size > 0)
1525 st->need_parsing = 0;
1527 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1529 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1530 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1531 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1532 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1533 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1534 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1537 for (i = 0; i < mp4_descr_count; i++)
1538 av_free(mp4_descr[i].dec_config_descr);
1541 static const uint8_t opus_coupled_stream_cnt[9] = {
1542 1, 0, 1, 1, 2, 2, 2, 3, 3
1545 static const uint8_t opus_stream_cnt[9] = {
1546 1, 1, 1, 2, 2, 3, 4, 4, 5,
1549 static const uint8_t opus_channel_map[8][8] = {
1557 { 0,6,1,2,3,4,5,7 },
1560 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1561 const uint8_t **pp, const uint8_t *desc_list_end,
1562 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1565 const uint8_t *desc_end;
1566 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1570 desc_tag = get8(pp, desc_list_end);
1572 return AVERROR_INVALIDDATA;
1573 desc_len = get8(pp, desc_list_end);
1575 return AVERROR_INVALIDDATA;
1576 desc_end = *pp + desc_len;
1577 if (desc_end > desc_list_end)
1578 return AVERROR_INVALIDDATA;
1580 av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1582 if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1583 stream_type == STREAM_TYPE_PRIVATE_DATA)
1584 mpegts_find_stream_type(st, desc_tag, DESC_types);
1587 case 0x1E: /* SL descriptor */
1588 desc_es_id = get16(pp, desc_end);
1591 if (ts && ts->pids[pid])
1592 ts->pids[pid]->es_id = desc_es_id;
1593 for (i = 0; i < mp4_descr_count; i++)
1594 if (mp4_descr[i].dec_config_descr_len &&
1595 mp4_descr[i].es_id == desc_es_id) {
1597 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1598 mp4_descr[i].dec_config_descr_len, 0,
1599 NULL, NULL, NULL, NULL);
1600 ff_mp4_read_dec_config_descr(fc, st, &pb);
1601 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1602 st->codec->extradata_size > 0)
1603 st->need_parsing = 0;
1604 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1605 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1608 case 0x1F: /* FMC descriptor */
1609 if (get16(pp, desc_end) < 0)
1611 if (mp4_descr_count > 0 &&
1612 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM ||
1613 (st->request_probe == 0 && st->codec->codec_id == AV_CODEC_ID_NONE) ||
1614 st->request_probe > 0) &&
1615 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1617 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1618 mp4_descr->dec_config_descr_len, 0,
1619 NULL, NULL, NULL, NULL);
1620 ff_mp4_read_dec_config_descr(fc, st, &pb);
1621 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1622 st->codec->extradata_size > 0) {
1623 st->request_probe = st->need_parsing = 0;
1624 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1628 case 0x56: /* DVB teletext descriptor */
1630 uint8_t *extradata = NULL;
1631 int language_count = desc_len / 5;
1633 if (desc_len > 0 && desc_len % 5 != 0)
1634 return AVERROR_INVALIDDATA;
1636 if (language_count > 0) {
1637 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1638 if (language_count > sizeof(language) / 4) {
1639 language_count = sizeof(language) / 4;
1642 if (st->codec->extradata == NULL) {
1643 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1644 return AVERROR(ENOMEM);
1648 if (st->codec->extradata_size < language_count * 2)
1649 return AVERROR_INVALIDDATA;
1651 extradata = st->codec->extradata;
1653 for (i = 0; i < language_count; i++) {
1654 language[i * 4 + 0] = get8(pp, desc_end);
1655 language[i * 4 + 1] = get8(pp, desc_end);
1656 language[i * 4 + 2] = get8(pp, desc_end);
1657 language[i * 4 + 3] = ',';
1659 memcpy(extradata, *pp, 2);
1665 language[i * 4 - 1] = 0;
1666 av_dict_set(&st->metadata, "language", language, 0);
1670 case 0x59: /* subtitling descriptor */
1672 /* 8 bytes per DVB subtitle substream data:
1673 * ISO_639_language_code (3 bytes),
1674 * subtitling_type (1 byte),
1675 * composition_page_id (2 bytes),
1676 * ancillary_page_id (2 bytes) */
1677 int language_count = desc_len / 8;
1679 if (desc_len > 0 && desc_len % 8 != 0)
1680 return AVERROR_INVALIDDATA;
1682 if (language_count > 1) {
1683 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1686 if (language_count > 0) {
1689 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1690 if (language_count > sizeof(language) / 4) {
1691 language_count = sizeof(language) / 4;
1694 if (st->codec->extradata == NULL) {
1695 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1696 return AVERROR(ENOMEM);
1700 if (st->codec->extradata_size < language_count * 5)
1701 return AVERROR_INVALIDDATA;
1703 extradata = st->codec->extradata;
1705 for (i = 0; i < language_count; i++) {
1706 language[i * 4 + 0] = get8(pp, desc_end);
1707 language[i * 4 + 1] = get8(pp, desc_end);
1708 language[i * 4 + 2] = get8(pp, desc_end);
1709 language[i * 4 + 3] = ',';
1711 /* hearing impaired subtitles detection using subtitling_type */
1713 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1714 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1715 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1716 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1717 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1718 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1719 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1723 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1724 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1730 language[i * 4 - 1] = 0;
1731 av_dict_set(&st->metadata, "language", language, 0);
1735 case 0x0a: /* ISO 639 language descriptor */
1736 for (i = 0; i + 4 <= desc_len; i += 4) {
1737 language[i + 0] = get8(pp, desc_end);
1738 language[i + 1] = get8(pp, desc_end);
1739 language[i + 2] = get8(pp, desc_end);
1740 language[i + 3] = ',';
1741 switch (get8(pp, desc_end)) {
1743 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1746 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1749 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1753 if (i && language[0]) {
1754 language[i - 1] = 0;
1755 av_dict_set(&st->metadata, "language", language, 0);
1758 case 0x05: /* registration descriptor */
1759 st->codec->codec_tag = bytestream_get_le32(pp);
1760 av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1761 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1762 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1764 case 0x52: /* stream identifier descriptor */
1765 st->stream_identifier = 1 + get8(pp, desc_end);
1767 case 0x26: /* metadata descriptor */
1768 if (get16(pp, desc_end) == 0xFFFF)
1770 if (get8(pp, desc_end) == 0xFF) {
1771 st->codec->codec_tag = bytestream_get_le32(pp);
1772 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1773 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1776 case 0x7f: /* DVB extension descriptor */
1777 ext_desc_tag = get8(pp, desc_end);
1778 if (ext_desc_tag < 0)
1779 return AVERROR_INVALIDDATA;
1780 if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1781 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1782 if (!st->codec->extradata) {
1783 st->codec->extradata = av_mallocz(sizeof(opus_default_extradata) +
1784 FF_INPUT_BUFFER_PADDING_SIZE);
1785 if (!st->codec->extradata)
1786 return AVERROR(ENOMEM);
1788 st->codec->extradata_size = sizeof(opus_default_extradata);
1789 memcpy(st->codec->extradata, opus_default_extradata, sizeof(opus_default_extradata));
1791 channel_config_code = get8(pp, desc_end);
1792 if (channel_config_code < 0)
1793 return AVERROR_INVALIDDATA;
1794 if (channel_config_code <= 0x8) {
1795 st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1796 st->codec->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
1797 st->codec->extradata[19] = opus_stream_cnt[channel_config_code];
1798 st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1799 memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1801 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1803 st->need_parsing = AVSTREAM_PARSE_FULL;
1814 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1816 MpegTSContext *ts = filter->u.section_filter.opaque;
1817 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1818 SectionHeader h1, *h = &h1;
1821 const uint8_t *p, *p_end, *desc_list_end;
1822 int program_info_length, pcr_pid, pid, stream_type;
1824 uint32_t prog_reg_desc = 0; /* registration descriptor */
1826 int mp4_descr_count = 0;
1827 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1830 av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
1831 hex_dump_debug(ts->stream, section, section_len);
1833 p_end = section + section_len - 4;
1835 if (parse_section_header(h, &p, p_end) < 0)
1837 if (skip_identical(h, tssf))
1840 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d version=%d\n",
1841 h->id, h->sec_num, h->last_sec_num, h->version);
1843 if (h->tid != PMT_TID)
1845 if (!ts->scan_all_pmts && ts->skip_changes)
1848 if (!ts->skip_clear)
1849 clear_program(ts, h->id);
1851 pcr_pid = get16(&p, p_end);
1855 add_pid_to_pmt(ts, h->id, pcr_pid);
1856 set_pcr_pid(ts->stream, h->id, pcr_pid);
1858 av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
1860 program_info_length = get16(&p, p_end);
1861 if (program_info_length < 0)
1863 program_info_length &= 0xfff;
1864 while (program_info_length >= 2) {
1866 tag = get8(&p, p_end);
1867 len = get8(&p, p_end);
1869 av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
1871 if (len > program_info_length - 2)
1872 // something else is broken, exit the program_descriptors_loop
1874 program_info_length -= len + 2;
1875 if (tag == 0x1d) { // IOD descriptor
1876 get8(&p, p_end); // scope
1877 get8(&p, p_end); // label
1879 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1880 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1881 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1882 prog_reg_desc = bytestream_get_le32(&p);
1887 p += program_info_length;
1891 // stop parsing after pmt, we found header
1892 if (!ts->stream->nb_streams)
1895 set_pmt_found(ts, h->id);
1901 stream_type = get8(&p, p_end);
1902 if (stream_type < 0)
1904 pid = get16(&p, p_end);
1908 if (pid == ts->current_pid)
1911 /* now create stream */
1912 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1913 pes = ts->pids[pid]->u.pes_filter.opaque;
1915 pes->st = avformat_new_stream(pes->stream, NULL);
1918 pes->st->id = pes->pid;
1921 } else if (stream_type != 0x13) {
1923 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1924 pes = add_pes_stream(ts, pid, pcr_pid);
1926 st = avformat_new_stream(pes->stream, NULL);
1932 int idx = ff_find_stream_index(ts->stream, pid);
1934 st = ts->stream->streams[idx];
1936 st = avformat_new_stream(ts->stream, NULL);
1940 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1947 if (pes && !pes->stream_type)
1948 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1950 add_pid_to_pmt(ts, h->id, pid);
1952 ff_program_add_stream_index(ts->stream, h->id, st->index);
1954 desc_list_len = get16(&p, p_end);
1955 if (desc_list_len < 0)
1957 desc_list_len &= 0xfff;
1958 desc_list_end = p + desc_list_len;
1959 if (desc_list_end > p_end)
1962 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1963 desc_list_end, mp4_descr,
1964 mp4_descr_count, pid, ts) < 0)
1967 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1968 stream_type == 0x83 && pes->sub_st) {
1969 ff_program_add_stream_index(ts->stream, h->id,
1970 pes->sub_st->index);
1971 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1977 if (!ts->pids[pcr_pid])
1978 mpegts_open_pcr_filter(ts, pcr_pid);
1981 for (i = 0; i < mp4_descr_count; i++)
1982 av_free(mp4_descr[i].dec_config_descr);
1985 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1987 MpegTSContext *ts = filter->u.section_filter.opaque;
1988 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1989 SectionHeader h1, *h = &h1;
1990 const uint8_t *p, *p_end;
1994 av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
1995 hex_dump_debug(ts->stream, section, section_len);
1997 p_end = section + section_len - 4;
1999 if (parse_section_header(h, &p, p_end) < 0)
2001 if (h->tid != PAT_TID)
2003 if (ts->skip_changes)
2006 if (skip_identical(h, tssf))
2008 ts->stream->ts_id = h->id;
2012 sid = get16(&p, p_end);
2015 pmt_pid = get16(&p, p_end);
2020 if (pmt_pid == ts->current_pid)
2023 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
2025 if (sid == 0x0000) {
2028 MpegTSFilter *fil = ts->pids[pmt_pid];
2029 program = av_new_program(ts->stream, sid);
2031 program->program_num = sid;
2032 program->pmt_pid = pmt_pid;
2035 if ( fil->type != MPEGTS_SECTION
2036 || fil->pid != pmt_pid
2037 || fil->u.section_filter.section_cb != pmt_cb)
2038 mpegts_close_filter(ts, ts->pids[pmt_pid]);
2040 if (!ts->pids[pmt_pid])
2041 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2042 add_pat_entry(ts, sid);
2043 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2044 add_pid_to_pmt(ts, sid, pmt_pid);
2050 for (j=0; j<ts->stream->nb_programs; j++) {
2051 for (i = 0; i < ts->nb_prg; i++)
2052 if (ts->prg[i].id == ts->stream->programs[j]->id)
2054 if (i==ts->nb_prg && !ts->skip_clear)
2055 clear_avprogram(ts, ts->stream->programs[j]->id);
2060 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2062 MpegTSContext *ts = filter->u.section_filter.opaque;
2063 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2064 SectionHeader h1, *h = &h1;
2065 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2066 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2067 char *name, *provider_name;
2069 av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
2070 hex_dump_debug(ts->stream, section, section_len);
2072 p_end = section + section_len - 4;
2074 if (parse_section_header(h, &p, p_end) < 0)
2076 if (h->tid != SDT_TID)
2078 if (ts->skip_changes)
2080 if (skip_identical(h, tssf))
2083 onid = get16(&p, p_end);
2086 val = get8(&p, p_end);
2090 sid = get16(&p, p_end);
2093 val = get8(&p, p_end);
2096 desc_list_len = get16(&p, p_end);
2097 if (desc_list_len < 0)
2099 desc_list_len &= 0xfff;
2100 desc_list_end = p + desc_list_len;
2101 if (desc_list_end > p_end)
2104 desc_tag = get8(&p, desc_list_end);
2107 desc_len = get8(&p, desc_list_end);
2108 desc_end = p + desc_len;
2109 if (desc_len < 0 || desc_end > desc_list_end)
2112 av_log(ts->stream, AV_LOG_TRACE, "tag: 0x%02x len=%d\n",
2113 desc_tag, desc_len);
2117 service_type = get8(&p, p_end);
2118 if (service_type < 0)
2120 provider_name = getstr8(&p, p_end);
2123 name = getstr8(&p, p_end);
2125 AVProgram *program = av_new_program(ts->stream, sid);
2127 av_dict_set(&program->metadata, "service_name", name, 0);
2128 av_dict_set(&program->metadata, "service_provider",
2133 av_free(provider_name);
2144 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2145 const uint8_t *packet);
2147 /* handle one TS packet */
2148 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2151 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2152 has_adaptation, has_payload;
2153 const uint8_t *p, *p_end;
2156 pid = AV_RB16(packet + 1) & 0x1fff;
2157 if (pid && discard_pid(ts, pid))
2159 is_start = packet[1] & 0x40;
2160 tss = ts->pids[pid];
2161 if (ts->auto_guess && !tss && is_start) {
2162 add_pes_stream(ts, pid, -1);
2163 tss = ts->pids[pid];
2167 ts->current_pid = pid;
2169 afc = (packet[3] >> 4) & 3;
2170 if (afc == 0) /* reserved value */
2172 has_adaptation = afc & 2;
2173 has_payload = afc & 1;
2174 is_discontinuity = has_adaptation &&
2175 packet[4] != 0 && /* with length > 0 */
2176 (packet[5] & 0x80); /* and discontinuity indicated */
2178 /* continuity check (currently not used) */
2179 cc = (packet[3] & 0xf);
2180 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2181 cc_ok = pid == 0x1FFF || // null packet PID
2188 av_log(ts->stream, AV_LOG_DEBUG,
2189 "Continuity check failed for pid %d expected %d got %d\n",
2190 pid, expected_cc, cc);
2191 if (tss->type == MPEGTS_PES) {
2192 PESContext *pc = tss->u.pes_filter.opaque;
2193 pc->flags |= AV_PKT_FLAG_CORRUPT;
2198 if (has_adaptation) {
2201 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2202 tss->last_pcr = pcr_h * 300 + pcr_l;
2203 /* skip adaptation field */
2206 /* if past the end of packet, ignore */
2207 p_end = packet + TS_PACKET_SIZE;
2208 if (p >= p_end || !has_payload)
2211 pos = avio_tell(ts->stream->pb);
2213 av_assert0(pos >= TS_PACKET_SIZE);
2214 ts->pos47_full = pos - TS_PACKET_SIZE;
2217 if (tss->type == MPEGTS_SECTION) {
2219 /* pointer field present */
2221 if (len > p_end - p)
2224 /* write remaining section bytes */
2225 write_section_data(ts, tss,
2227 /* check whether filter has been closed */
2233 write_section_data(ts, tss,
2238 write_section_data(ts, tss,
2243 // stop find_stream_info from waiting for more streams
2244 // when all programs have received a PMT
2245 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2247 for (i = 0; i < ts->nb_prg; i++) {
2248 if (!ts->prg[i].pmt_found)
2251 if (i == ts->nb_prg && ts->nb_prg > 0) {
2253 for (i = 0; i < ts->stream->nb_streams; i++) {
2254 AVStream *st = ts->stream->streams[i];
2255 types |= 1<<st->codec->codec_type;
2257 if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2258 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2259 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2266 // Note: The position here points actually behind the current packet.
2267 if (tss->type == MPEGTS_PES) {
2268 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2269 pos - ts->raw_packet_size)) < 0)
2277 static void reanalyze(MpegTSContext *ts) {
2278 AVIOContext *pb = ts->stream->pb;
2279 int64_t pos = avio_tell(pb);
2282 pos -= ts->pos47_full;
2283 if (pos == TS_PACKET_SIZE) {
2284 ts->size_stat[0] ++;
2285 } else if (pos == TS_DVHS_PACKET_SIZE) {
2286 ts->size_stat[1] ++;
2287 } else if (pos == TS_FEC_PACKET_SIZE) {
2288 ts->size_stat[2] ++;
2291 ts->size_stat_count ++;
2292 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2294 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2295 newsize = TS_PACKET_SIZE;
2296 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2297 newsize = TS_DVHS_PACKET_SIZE;
2298 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2299 newsize = TS_FEC_PACKET_SIZE;
2301 if (newsize && newsize != ts->raw_packet_size) {
2302 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2303 ts->raw_packet_size = newsize;
2305 ts->size_stat_count = 0;
2306 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2310 /* XXX: try to find a better synchro over several packets (use
2311 * get_packet_size() ?) */
2312 static int mpegts_resync(AVFormatContext *s)
2314 MpegTSContext *ts = s->priv_data;
2315 AVIOContext *pb = s->pb;
2318 for (i = 0; i < ts->resync_size; i++) {
2323 avio_seek(pb, -1, SEEK_CUR);
2324 reanalyze(s->priv_data);
2328 av_log(s, AV_LOG_ERROR,
2329 "max resync size reached, could not find sync byte\n");
2331 return AVERROR_INVALIDDATA;
2334 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2335 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2336 const uint8_t **data)
2338 AVIOContext *pb = s->pb;
2342 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2343 if (len != TS_PACKET_SIZE)
2344 return len < 0 ? len : AVERROR_EOF;
2345 /* check packet sync byte */
2346 if ((*data)[0] != 0x47) {
2347 /* find a new packet start */
2348 uint64_t pos = avio_tell(pb);
2349 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2351 if (mpegts_resync(s) < 0)
2352 return AVERROR(EAGAIN);
2362 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2364 AVIOContext *pb = s->pb;
2365 int skip = raw_packet_size - TS_PACKET_SIZE;
2367 avio_skip(pb, skip);
2370 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2372 AVFormatContext *s = ts->stream;
2373 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2374 const uint8_t *data;
2378 if (avio_tell(s->pb) != ts->last_pos) {
2380 av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
2381 /* seek detected, flush pes buffer */
2382 for (i = 0; i < NB_PID_MAX; i++) {
2384 if (ts->pids[i]->type == MPEGTS_PES) {
2385 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2386 av_buffer_unref(&pes->buffer);
2387 pes->data_index = 0;
2388 pes->state = MPEGTS_SKIP; /* skip until pes header */
2389 } else if (ts->pids[i]->type == MPEGTS_SECTION) {
2390 ts->pids[i]->u.section_filter.last_ver = -1;
2392 ts->pids[i]->last_cc = -1;
2393 ts->pids[i]->last_pcr = -1;
2400 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2403 if (nb_packets != 0 && packet_num >= nb_packets ||
2404 ts->stop_parse > 1) {
2405 ret = AVERROR(EAGAIN);
2408 if (ts->stop_parse > 0)
2411 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2414 ret = handle_packet(ts, data);
2415 finished_reading_packet(s, ts->raw_packet_size);
2419 ts->last_pos = avio_tell(s->pb);
2423 static int mpegts_probe(AVProbeData *p)
2425 const int size = p->buf_size;
2429 int check_count = size / TS_FEC_PACKET_SIZE;
2430 #define CHECK_COUNT 10
2431 #define CHECK_BLOCK 100
2433 if (check_count < CHECK_COUNT)
2434 return AVERROR_INVALIDDATA;
2436 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2437 int left = FFMIN(check_count - i, CHECK_BLOCK);
2438 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL, 1);
2439 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL, 1);
2440 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL, 1);
2441 score = FFMAX3(score, dvhs_score, fec_score);
2443 maxscore = FFMAX(maxscore, score);
2446 sumscore = sumscore * CHECK_COUNT / check_count;
2447 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2449 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2451 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2452 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2454 return AVERROR_INVALIDDATA;
2457 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2458 * (-1) if not available */
2459 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2461 int afc, len, flags;
2465 afc = (packet[3] >> 4) & 3;
2467 return AVERROR_INVALIDDATA;
2472 return AVERROR_INVALIDDATA;
2475 if (!(flags & 0x10))
2476 return AVERROR_INVALIDDATA;
2478 return AVERROR_INVALIDDATA;
2480 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2481 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2485 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2487 /* NOTE: We attempt to seek on non-seekable files as well, as the
2488 * probe buffer usually is big enough. Only warn if the seek failed
2489 * on files where the seek should work. */
2490 if (avio_seek(pb, pos, SEEK_SET) < 0)
2491 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2494 static int mpegts_read_header(AVFormatContext *s)
2496 MpegTSContext *ts = s->priv_data;
2497 AVIOContext *pb = s->pb;
2498 uint8_t buf[8 * 1024] = {0};
2500 int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2502 if (ffio_ensure_seekback(pb, probesize) < 0)
2503 av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
2505 /* read the first 8192 bytes to get packet size */
2506 pos = avio_tell(pb);
2507 len = avio_read(pb, buf, sizeof(buf));
2508 ts->raw_packet_size = get_packet_size(buf, len);
2509 if (ts->raw_packet_size <= 0) {
2510 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2511 ts->raw_packet_size = TS_PACKET_SIZE;
2516 if (s->iformat == &ff_mpegts_demuxer) {
2519 /* first do a scan to get all the services */
2520 seek_back(s, pb, pos);
2522 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2524 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2526 handle_packets(ts, probesize / ts->raw_packet_size);
2527 /* if could not find service, enable auto_guess */
2531 av_log(ts->stream, AV_LOG_TRACE, "tuning done\n");
2533 s->ctx_flags |= AVFMTCTX_NOHEADER;
2536 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2537 int64_t pcrs[2], pcr_h;
2538 int packet_count[2];
2539 uint8_t packet[TS_PACKET_SIZE];
2540 const uint8_t *data;
2542 /* only read packets */
2544 st = avformat_new_stream(s, NULL);
2546 return AVERROR(ENOMEM);
2547 avpriv_set_pts_info(st, 60, 1, 27000000);
2548 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2549 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2551 /* we iterate until we find two PCRs to estimate the bitrate */
2556 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2559 pid = AV_RB16(data + 1) & 0x1fff;
2560 if ((pcr_pid == -1 || pcr_pid == pid) &&
2561 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2562 finished_reading_packet(s, ts->raw_packet_size);
2564 packet_count[nb_pcrs] = nb_packets;
2565 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2570 finished_reading_packet(s, ts->raw_packet_size);
2575 /* NOTE1: the bitrate is computed without the FEC */
2576 /* NOTE2: it is only the bitrate of the start of the stream */
2577 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2578 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2579 s->bit_rate = TS_PACKET_SIZE * 8 * 27000000LL / ts->pcr_incr;
2580 st->codec->bit_rate = s->bit_rate;
2581 st->start_time = ts->cur_pcr;
2582 av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%d\n",
2583 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2586 seek_back(s, pb, pos);
2590 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2592 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2594 MpegTSContext *ts = s->priv_data;
2596 int64_t pcr_h, next_pcr_h, pos;
2597 int pcr_l, next_pcr_l;
2598 uint8_t pcr_buf[12];
2599 const uint8_t *data;
2601 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2602 return AVERROR(ENOMEM);
2603 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2604 pkt->pos = avio_tell(s->pb);
2606 av_free_packet(pkt);
2609 if (data != pkt->data)
2610 memcpy(pkt->data, data, ts->raw_packet_size);
2611 finished_reading_packet(s, ts->raw_packet_size);
2612 if (ts->mpeg2ts_compute_pcr) {
2613 /* compute exact PCR for each packet */
2614 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2615 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2616 pos = avio_tell(s->pb);
2617 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2618 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2619 avio_read(s->pb, pcr_buf, 12);
2620 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2621 /* XXX: not precise enough */
2623 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2628 avio_seek(s->pb, pos, SEEK_SET);
2629 /* no next PCR found: we use previous increment */
2630 ts->cur_pcr = pcr_h * 300 + pcr_l;
2632 pkt->pts = ts->cur_pcr;
2633 pkt->duration = ts->pcr_incr;
2634 ts->cur_pcr += ts->pcr_incr;
2636 pkt->stream_index = 0;
2640 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2642 MpegTSContext *ts = s->priv_data;
2647 ret = handle_packets(ts, 0);
2649 av_free_packet(ts->pkt);
2650 /* flush pes data left */
2651 for (i = 0; i < NB_PID_MAX; i++)
2652 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2653 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2654 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2655 new_pes_packet(pes, pkt);
2656 pes->state = MPEGTS_SKIP;
2663 if (!ret && pkt->size < 0)
2664 ret = AVERROR(EINTR);
2668 static void mpegts_free(MpegTSContext *ts)
2674 for (i = 0; i < NB_PID_MAX; i++)
2676 mpegts_close_filter(ts, ts->pids[i]);
2679 static int mpegts_read_close(AVFormatContext *s)
2681 MpegTSContext *ts = s->priv_data;
2686 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2687 int64_t *ppos, int64_t pos_limit)
2689 MpegTSContext *ts = s->priv_data;
2690 int64_t pos, timestamp;
2691 uint8_t buf[TS_PACKET_SIZE];
2692 int pcr_l, pcr_pid =
2693 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2694 int pos47 = ts->pos47_full % ts->raw_packet_size;
2696 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2697 ts->raw_packet_size + pos47;
2698 while(pos < pos_limit) {
2699 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2700 return AV_NOPTS_VALUE;
2701 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2702 return AV_NOPTS_VALUE;
2703 if (buf[0] != 0x47) {
2704 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2705 if (mpegts_resync(s) < 0)
2706 return AV_NOPTS_VALUE;
2707 pos = avio_tell(s->pb);
2710 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2711 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2715 pos += ts->raw_packet_size;
2718 return AV_NOPTS_VALUE;
2721 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2722 int64_t *ppos, int64_t pos_limit)
2724 MpegTSContext *ts = s->priv_data;
2726 int pos47 = ts->pos47_full % ts->raw_packet_size;
2727 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2728 ff_read_frame_flush(s);
2729 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2730 return AV_NOPTS_VALUE;
2731 while(pos < pos_limit) {
2734 av_init_packet(&pkt);
2735 ret = av_read_frame(s, &pkt);
2737 return AV_NOPTS_VALUE;
2738 av_free_packet(&pkt);
2739 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2740 ff_reduce_index(s, pkt.stream_index);
2741 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2742 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2750 return AV_NOPTS_VALUE;
2753 /**************************************************************/
2754 /* parsing functions - called from other demuxers such as RTP */
2756 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
2760 ts = av_mallocz(sizeof(MpegTSContext));
2763 /* no stream case, currently used by RTP */
2764 ts->raw_packet_size = TS_PACKET_SIZE;
2767 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2768 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2773 /* return the consumed length if a packet was output, or -1 if no
2774 * packet is output */
2775 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2776 const uint8_t *buf, int len)
2784 if (len < TS_PACKET_SIZE)
2785 return AVERROR_INVALIDDATA;
2786 if (buf[0] != 0x47) {
2790 handle_packet(ts, buf);
2791 buf += TS_PACKET_SIZE;
2792 len -= TS_PACKET_SIZE;
2793 if (ts->stop_parse == 1)
2800 void avpriv_mpegts_parse_close(MpegTSContext *ts)
2806 AVInputFormat ff_mpegts_demuxer = {
2808 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2809 .priv_data_size = sizeof(MpegTSContext),
2810 .read_probe = mpegts_probe,
2811 .read_header = mpegts_read_header,
2812 .read_packet = mpegts_read_packet,
2813 .read_close = mpegts_read_close,
2814 .read_timestamp = mpegts_get_dts,
2815 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2816 .priv_class = &mpegts_class,
2819 AVInputFormat ff_mpegtsraw_demuxer = {
2820 .name = "mpegtsraw",
2821 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2822 .priv_data_size = sizeof(MpegTSContext),
2823 .read_header = mpegts_read_header,
2824 .read_packet = mpegts_raw_read_packet,
2825 .read_close = mpegts_read_close,
2826 .read_timestamp = mpegts_get_dts,
2827 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2828 .priv_class = &mpegtsraw_class,