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"
35 #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 {
79 unsigned int check_crc : 1;
80 unsigned int end_of_section_reached : 1;
81 SectionCallback *section_cb;
83 } MpegTSSectionFilter;
88 int last_cc; /* last cc code (-1 if first packet) */
90 enum MpegTSFilterType type;
92 MpegTSPESFilter pes_filter;
93 MpegTSSectionFilter section_filter;
97 #define MAX_PIDS_PER_PROGRAM 64
99 unsigned int id; // program id/service id
100 unsigned int nb_pids;
101 unsigned int pids[MAX_PIDS_PER_PROGRAM];
103 /** have we found pmt for this program */
107 struct MpegTSContext {
108 const AVClass *class;
110 AVFormatContext *stream;
111 /** raw packet size, including FEC if present */
116 #define SIZE_STAT_THRESHOLD 10
120 /** if true, all pids are analyzed to find streams */
123 /** compute exact PCR for each transport stream packet */
124 int mpeg2ts_compute_pcr;
126 /** fix dvb teletext pts */
127 int fix_teletext_pts;
129 int64_t cur_pcr; /**< used to estimate the exact PCR */
130 int pcr_incr; /**< used to estimate the exact PCR */
132 /* data needed to handle file based ts */
133 /** stop parsing loop */
135 /** packet containing Audio/Video data */
137 /** to detect seek */
140 /******************************************/
141 /* private mpegts data */
143 /** structure to keep track of Program->pids mapping */
147 int8_t crc_validity[NB_PID_MAX];
148 /** filters for various streams specified by PMT + for the PAT and PMT */
149 MpegTSFilter *pids[NB_PID_MAX];
153 static const AVOption mpegtsraw_options[] = {
154 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
155 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
156 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
157 { "ts_packetsize", "Output option carrying the raw packet size.",
158 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
160 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
164 static const AVClass mpegtsraw_class = {
165 .class_name = "mpegtsraw demuxer",
166 .item_name = av_default_item_name,
167 .option = mpegtsraw_options,
168 .version = LIBAVUTIL_VERSION_INT,
171 static const AVOption mpegts_options[] = {
172 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
173 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
174 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
175 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
179 static const AVClass mpegts_class = {
180 .class_name = "mpegts demuxer",
181 .item_name = av_default_item_name,
182 .option = mpegts_options,
183 .version = LIBAVUTIL_VERSION_INT,
186 /* TS stream handling */
191 MPEGTS_PESHEADER_FILL,
196 /* enough for PES header + length */
197 #define PES_START_SIZE 6
198 #define PES_HEADER_SIZE 9
199 #define MAX_PES_HEADER_SIZE (9 + 255)
201 typedef struct PESContext {
203 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
206 AVFormatContext *stream;
208 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
209 enum MpegTSState state;
210 /* used to get the format */
212 int flags; /**< copied to the AVPacket flags */
215 int extended_stream_id;
217 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
218 uint8_t header[MAX_PES_HEADER_SIZE];
223 extern AVInputFormat ff_mpegts_demuxer;
225 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
228 for (i = 0; i < ts->nb_prg; i++) {
229 if (ts->prg[i].id == programid) {
236 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
238 AVProgram *prg = NULL;
240 for (i = 0; i < ts->stream->nb_programs; i++)
241 if (ts->stream->programs[i]->id == programid) {
242 prg = ts->stream->programs[i];
247 prg->nb_stream_indexes = 0;
250 static void clear_program(MpegTSContext *ts, unsigned int programid)
254 clear_avprogram(ts, programid);
255 for (i = 0; i < ts->nb_prg; i++)
256 if (ts->prg[i].id == programid) {
257 ts->prg[i].nb_pids = 0;
258 ts->prg[i].pmt_found = 0;
262 static void clear_programs(MpegTSContext *ts)
268 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
271 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
275 p = &ts->prg[ts->nb_prg];
282 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
285 struct Program *p = get_program(ts, programid);
289 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
291 p->pids[p->nb_pids++] = pid;
294 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
296 struct Program *p = get_program(ts, programid);
303 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
306 for (i = 0; i < s->nb_programs; i++) {
307 if (s->programs[i]->id == programid) {
308 s->programs[i]->pcr_pid = pid;
315 * @brief discard_pid() decides if the pid is to be discarded according
316 * to caller's programs selection
317 * @param ts : - TS context
319 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
322 static int discard_pid(MpegTSContext *ts, unsigned int pid)
325 int used = 0, discarded = 0;
328 /* If none of the programs have .discard=AVDISCARD_ALL then there's
329 * no way we have to discard this packet */
330 for (k = 0; k < ts->stream->nb_programs; k++)
331 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
333 if (k == ts->stream->nb_programs)
336 for (i = 0; i < ts->nb_prg; i++) {
338 for (j = 0; j < p->nb_pids; j++) {
339 if (p->pids[j] != pid)
341 // is program with id p->id set to be discarded?
342 for (k = 0; k < ts->stream->nb_programs; k++) {
343 if (ts->stream->programs[k]->id == p->id) {
344 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
353 return !used && discarded;
357 * Assemble PES packets out of TS packets, and then call the "section_cb"
358 * function when they are complete.
360 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
361 const uint8_t *buf, int buf_size, int is_start)
363 MpegTSContext *ts = s->priv_data;
364 MpegTSSectionFilter *tss = &tss1->u.section_filter;
368 memcpy(tss->section_buf, buf, buf_size);
369 tss->section_index = buf_size;
370 tss->section_h_size = -1;
371 tss->end_of_section_reached = 0;
373 if (tss->end_of_section_reached)
375 len = 4096 - tss->section_index;
378 memcpy(tss->section_buf + tss->section_index, buf, len);
379 tss->section_index += len;
382 /* compute section length if possible */
383 if (tss->section_h_size == -1 && tss->section_index >= 3) {
384 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
387 tss->section_h_size = len;
390 if (tss->section_h_size != -1 &&
391 tss->section_index >= tss->section_h_size) {
393 tss->end_of_section_reached = 1;
395 if (tss->check_crc) {
396 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
398 ts->crc_validity[ tss1->pid ] = 100;
399 }else if (ts->crc_validity[ tss1->pid ] > -10) {
400 ts->crc_validity[ tss1->pid ]--;
405 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
409 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
410 enum MpegTSFilterType type)
412 MpegTSFilter *filter;
414 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
416 if (pid >= NB_PID_MAX || ts->pids[pid])
418 filter = av_mallocz(sizeof(MpegTSFilter));
421 ts->pids[pid] = filter;
426 filter->last_cc = -1;
427 filter->last_pcr= -1;
432 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
434 SectionCallback *section_cb,
438 MpegTSFilter *filter;
439 MpegTSSectionFilter *sec;
441 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
443 sec = &filter->u.section_filter;
444 sec->section_cb = section_cb;
445 sec->opaque = opaque;
446 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
447 sec->check_crc = check_crc;
448 if (!sec->section_buf) {
455 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
459 MpegTSFilter *filter;
460 MpegTSPESFilter *pes;
462 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
465 pes = &filter->u.pes_filter;
466 pes->pes_cb = pes_cb;
467 pes->opaque = opaque;
471 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
473 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
476 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
481 if (filter->type == MPEGTS_SECTION)
482 av_freep(&filter->u.section_filter.section_buf);
483 else if (filter->type == MPEGTS_PES) {
484 PESContext *pes = filter->u.pes_filter.opaque;
485 av_buffer_unref(&pes->buffer);
486 /* referenced private data will be freed later in
487 * avformat_close_input */
488 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
489 av_freep(&filter->u.pes_filter.opaque);
494 ts->pids[pid] = NULL;
497 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
499 int stat[TS_MAX_PACKET_SIZE];
503 memset(stat, 0, packet_size * sizeof(*stat));
505 for (i = 0; i < size - 3; i++) {
506 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
507 int x = i % packet_size;
509 if (stat[x] > best_score) {
510 best_score = stat[x];
520 /* autodetect fec presence. Must have at least 1024 bytes */
521 static int get_packet_size(const uint8_t *buf, int size)
523 int score, fec_score, dvhs_score;
525 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
526 return AVERROR_INVALIDDATA;
528 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
529 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
530 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
531 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
532 score, dvhs_score, fec_score);
534 if (score > fec_score && score > dvhs_score)
535 return TS_PACKET_SIZE;
536 else if (dvhs_score > score && dvhs_score > fec_score)
537 return TS_DVHS_PACKET_SIZE;
538 else if (score < fec_score && dvhs_score < fec_score)
539 return TS_FEC_PACKET_SIZE;
541 return AVERROR_INVALIDDATA;
544 typedef struct SectionHeader {
549 uint8_t last_sec_num;
552 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
559 return AVERROR_INVALIDDATA;
565 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
571 if ((p + 1) >= p_end)
572 return AVERROR_INVALIDDATA;
579 /* read and allocate a DVB string preceded by its length */
580 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
587 len = get8(&p, p_end);
590 if ((p + len) > p_end)
592 str = av_malloc(len + 1);
602 static int parse_section_header(SectionHeader *h,
603 const uint8_t **pp, const uint8_t *p_end)
607 val = get8(pp, p_end);
612 val = get16(pp, p_end);
616 val = get8(pp, p_end);
619 h->version = (val >> 1) & 0x1f;
620 val = get8(pp, p_end);
624 val = get8(pp, p_end);
627 h->last_sec_num = val;
632 uint32_t stream_type;
633 enum AVMediaType codec_type;
634 enum AVCodecID codec_id;
637 static const StreamType ISO_types[] = {
638 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
639 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
640 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
641 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
642 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
643 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
644 /* Makito encoder sets stream type 0x11 for AAC,
645 * so auto-detect LOAS/LATM instead of hardcoding it. */
646 #if !CONFIG_LOAS_DEMUXER
647 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
649 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
650 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
651 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
652 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
653 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
657 static const StreamType HDMV_types[] = {
658 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
659 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
660 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
661 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
662 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
663 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
664 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
665 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
666 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
667 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
672 static const StreamType MISC_types[] = {
673 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
674 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
678 static const StreamType REGD_types[] = {
679 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
680 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
681 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
682 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
683 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
684 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
685 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
686 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
687 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
691 static const StreamType METADATA_types[] = {
692 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
693 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
697 /* descriptor present */
698 static const StreamType DESC_types[] = {
699 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
700 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
701 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
702 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
703 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
707 static void mpegts_find_stream_type(AVStream *st,
708 uint32_t stream_type,
709 const StreamType *types)
711 if (avcodec_is_open(st->codec)) {
712 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
716 for (; types->stream_type; types++)
717 if (stream_type == types->stream_type) {
718 st->codec->codec_type = types->codec_type;
719 st->codec->codec_id = types->codec_id;
720 st->request_probe = 0;
725 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
726 uint32_t stream_type, uint32_t prog_reg_desc)
728 int old_codec_type = st->codec->codec_type;
729 int old_codec_id = st->codec->codec_id;
731 if (avcodec_is_open(st->codec)) {
732 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
736 avpriv_set_pts_info(st, 33, 1, 90000);
738 st->codec->codec_type = AVMEDIA_TYPE_DATA;
739 st->codec->codec_id = AV_CODEC_ID_NONE;
740 st->need_parsing = AVSTREAM_PARSE_FULL;
742 pes->stream_type = stream_type;
744 av_log(pes->stream, AV_LOG_DEBUG,
745 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
746 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
748 st->codec->codec_tag = pes->stream_type;
750 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
751 if ((prog_reg_desc == AV_RL32("HDMV") ||
752 prog_reg_desc == AV_RL32("HDPR")) &&
753 st->codec->codec_id == AV_CODEC_ID_NONE) {
754 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
755 if (pes->stream_type == 0x83) {
756 // HDMV TrueHD streams also contain an AC3 coded version of the
757 // audio track - add a second stream for this
759 // priv_data cannot be shared between streams
760 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
762 return AVERROR(ENOMEM);
763 memcpy(sub_pes, pes, sizeof(*sub_pes));
765 sub_st = avformat_new_stream(pes->stream, NULL);
768 return AVERROR(ENOMEM);
771 sub_st->id = pes->pid;
772 avpriv_set_pts_info(sub_st, 33, 1, 90000);
773 sub_st->priv_data = sub_pes;
774 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
775 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
776 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
777 sub_pes->sub_st = pes->sub_st = sub_st;
780 if (st->codec->codec_id == AV_CODEC_ID_NONE)
781 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
782 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
783 st->codec->codec_id = old_codec_id;
784 st->codec->codec_type = old_codec_type;
790 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
794 pkt->buf = pes->buffer;
795 pkt->data = pes->buffer->data;
796 pkt->size = pes->data_index;
798 if (pes->total_size != MAX_PES_PAYLOAD &&
799 pes->pes_header_size + pes->data_index != pes->total_size +
801 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
802 pes->flags |= AV_PKT_FLAG_CORRUPT;
804 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
806 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
807 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
808 pkt->stream_index = pes->sub_st->index;
810 pkt->stream_index = pes->st->index;
813 /* store position of first TS packet of this PES packet */
814 pkt->pos = pes->ts_packet_pos;
815 pkt->flags = pes->flags;
817 /* reset pts values */
818 pes->pts = AV_NOPTS_VALUE;
819 pes->dts = AV_NOPTS_VALUE;
825 static uint64_t get_ts64(GetBitContext *gb, int bits)
827 if (get_bits_left(gb) < bits)
828 return AV_NOPTS_VALUE;
829 return get_bits64(gb, bits);
832 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
833 const uint8_t *buf, int buf_size)
836 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
837 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
838 int dts_flag = -1, cts_flag = -1;
839 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
841 init_get_bits(&gb, buf, buf_size * 8);
843 if (sl->use_au_start)
844 au_start_flag = get_bits1(&gb);
846 au_end_flag = get_bits1(&gb);
847 if (!sl->use_au_start && !sl->use_au_end)
848 au_start_flag = au_end_flag = 1;
850 ocr_flag = get_bits1(&gb);
852 idle_flag = get_bits1(&gb);
854 padding_flag = get_bits1(&gb);
856 padding_bits = get_bits(&gb, 3);
858 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
859 if (sl->packet_seq_num_len)
860 skip_bits_long(&gb, sl->packet_seq_num_len);
861 if (sl->degr_prior_len)
863 skip_bits(&gb, sl->degr_prior_len);
865 skip_bits_long(&gb, sl->ocr_len);
867 if (sl->use_rand_acc_pt)
869 if (sl->au_seq_num_len > 0)
870 skip_bits_long(&gb, sl->au_seq_num_len);
871 if (sl->use_timestamps) {
872 dts_flag = get_bits1(&gb);
873 cts_flag = get_bits1(&gb);
876 if (sl->inst_bitrate_len)
877 inst_bitrate_flag = get_bits1(&gb);
879 dts = get_ts64(&gb, sl->timestamp_len);
881 cts = get_ts64(&gb, sl->timestamp_len);
883 skip_bits_long(&gb, sl->au_len);
884 if (inst_bitrate_flag)
885 skip_bits_long(&gb, sl->inst_bitrate_len);
888 if (dts != AV_NOPTS_VALUE)
890 if (cts != AV_NOPTS_VALUE)
893 if (sl->timestamp_len && sl->timestamp_res)
894 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
896 return (get_bits_count(&gb) + 7) >> 3;
899 /* return non zero if a packet could be constructed */
900 static int mpegts_push_data(MpegTSFilter *filter,
901 const uint8_t *buf, int buf_size, int is_start,
904 PESContext *pes = filter->u.pes_filter.opaque;
905 MpegTSContext *ts = pes->ts;
913 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
914 new_pes_packet(pes, ts->pkt);
917 pes->state = MPEGTS_HEADER;
919 pes->ts_packet_pos = pos;
922 while (buf_size > 0) {
923 switch (pes->state) {
925 len = PES_START_SIZE - pes->data_index;
928 memcpy(pes->header + pes->data_index, p, len);
929 pes->data_index += len;
932 if (pes->data_index == PES_START_SIZE) {
933 /* we got all the PES or section header. We can now
935 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
936 pes->header[2] == 0x01) {
937 /* it must be an mpeg2 PES stream */
938 code = pes->header[3] | 0x100;
939 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
942 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
944 pes->sub_st->discard == AVDISCARD_ALL)) ||
945 code == 0x1be) /* padding_stream */
948 /* stream not present in PMT */
950 pes->st = avformat_new_stream(ts->stream, NULL);
952 return AVERROR(ENOMEM);
953 pes->st->id = pes->pid;
954 mpegts_set_stream_info(pes->st, pes, 0, 0);
957 pes->total_size = AV_RB16(pes->header + 4);
958 /* NOTE: a zero total size means the PES size is
960 if (!pes->total_size)
961 pes->total_size = MAX_PES_PAYLOAD;
963 /* allocate pes buffer */
964 pes->buffer = av_buffer_alloc(pes->total_size +
965 FF_INPUT_BUFFER_PADDING_SIZE);
967 return AVERROR(ENOMEM);
969 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
970 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
971 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
972 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
973 pes->state = MPEGTS_PESHEADER;
974 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
976 "pid=%x stream_type=%x probing\n",
979 pes->st->request_probe = 1;
982 pes->state = MPEGTS_PAYLOAD;
986 /* otherwise, it should be a table */
989 pes->state = MPEGTS_SKIP;
994 /**********************************************/
995 /* PES packing parsing */
996 case MPEGTS_PESHEADER:
997 len = PES_HEADER_SIZE - pes->data_index;
999 return AVERROR_INVALIDDATA;
1002 memcpy(pes->header + pes->data_index, p, len);
1003 pes->data_index += len;
1006 if (pes->data_index == PES_HEADER_SIZE) {
1007 pes->pes_header_size = pes->header[8] + 9;
1008 pes->state = MPEGTS_PESHEADER_FILL;
1011 case MPEGTS_PESHEADER_FILL:
1012 len = pes->pes_header_size - pes->data_index;
1014 return AVERROR_INVALIDDATA;
1017 memcpy(pes->header + pes->data_index, p, len);
1018 pes->data_index += len;
1021 if (pes->data_index == pes->pes_header_size) {
1023 unsigned int flags, pes_ext, skip;
1025 flags = pes->header[7];
1026 r = pes->header + 9;
1027 pes->pts = AV_NOPTS_VALUE;
1028 pes->dts = AV_NOPTS_VALUE;
1029 if ((flags & 0xc0) == 0x80) {
1030 pes->dts = pes->pts = ff_parse_pes_pts(r);
1032 } else if ((flags & 0xc0) == 0xc0) {
1033 pes->pts = ff_parse_pes_pts(r);
1035 pes->dts = ff_parse_pes_pts(r);
1038 pes->extended_stream_id = -1;
1039 if (flags & 0x01) { /* PES extension */
1041 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1042 skip = (pes_ext >> 4) & 0xb;
1045 if ((pes_ext & 0x41) == 0x01 &&
1046 (r + 2) <= (pes->header + pes->pes_header_size)) {
1047 /* PES extension 2 */
1048 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1049 pes->extended_stream_id = r[1];
1053 /* we got the full header. We parse it and get the payload */
1054 pes->state = MPEGTS_PAYLOAD;
1055 pes->data_index = 0;
1056 if (pes->stream_type == 0x12 && buf_size > 0) {
1057 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1059 pes->pes_header_size += sl_header_bytes;
1060 p += sl_header_bytes;
1061 buf_size -= sl_header_bytes;
1063 if (pes->stream_type == 0x15 && buf_size >= 5) {
1064 /* skip metadata access unit header */
1065 pes->pes_header_size += 5;
1069 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1070 AVProgram *p = NULL;
1071 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1072 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1073 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1075 AVStream *st = NULL;
1076 if (f->type == MPEGTS_PES) {
1077 PESContext *pcrpes = f->u.pes_filter.opaque;
1080 } else if (f->type == MPEGTS_PCR) {
1082 for (i = 0; i < p->nb_stream_indexes; i++) {
1083 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1084 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1088 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1089 // teletext packets do not always have correct timestamps,
1090 // the standard says they should be handled after 40.6 ms at most,
1091 // and the pcr error to this packet should be no more than 100 ms.
1092 // TODO: we should interpolate the PCR, not just use the last one
1093 int64_t pcr = f->last_pcr / 300;
1094 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1095 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1096 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1097 pes->pts = pes->dts = pcr;
1098 } else if (pes->dts > pcr + 3654 + 9000) {
1099 pes->pts = pes->dts = pcr + 3654 + 9000;
1109 case MPEGTS_PAYLOAD:
1110 if (buf_size > 0 && pes->buffer) {
1111 if (pes->data_index > 0 &&
1112 pes->data_index + buf_size > pes->total_size) {
1113 new_pes_packet(pes, ts->pkt);
1114 pes->total_size = MAX_PES_PAYLOAD;
1115 pes->buffer = av_buffer_alloc(pes->total_size +
1116 FF_INPUT_BUFFER_PADDING_SIZE);
1118 return AVERROR(ENOMEM);
1120 } else if (pes->data_index == 0 &&
1121 buf_size > pes->total_size) {
1122 // pes packet size is < ts size packet and pes data is padded with 0xff
1123 // not sure if this is legal in ts but see issue #2392
1124 buf_size = pes->total_size;
1126 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1127 pes->data_index += buf_size;
1130 /* emit complete packets with known packet size
1131 * decreases demuxer delay for infrequent packets like subtitles from
1132 * a couple of seconds to milliseconds for properly muxed files.
1133 * total_size is the number of bytes following pes_packet_length
1134 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1135 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1136 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1138 new_pes_packet(pes, ts->pkt);
1150 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1155 /* if no pid found, then add a pid context */
1156 pes = av_mallocz(sizeof(PESContext));
1160 pes->stream = ts->stream;
1162 pes->pcr_pid = pcr_pid;
1163 pes->state = MPEGTS_SKIP;
1164 pes->pts = AV_NOPTS_VALUE;
1165 pes->dts = AV_NOPTS_VALUE;
1166 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1179 Mp4Descr *active_descr;
1181 int max_descr_count;
1183 } MP4DescrParseContext;
1185 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1186 const uint8_t *buf, unsigned size,
1187 Mp4Descr *descr, int max_descr_count)
1190 if (size > (1 << 30))
1191 return AVERROR_INVALIDDATA;
1193 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1194 NULL, NULL, NULL, NULL)) < 0)
1201 d->active_descr = NULL;
1202 d->max_descr_count = max_descr_count;
1207 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1209 int64_t new_off = avio_tell(pb);
1210 (*len) -= new_off - *off;
1214 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1217 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1220 int ret = parse_mp4_descr(d, off, len, 0);
1223 update_offsets(&d->pb, &off, &len);
1228 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1230 avio_rb16(&d->pb); // ID
1236 update_offsets(&d->pb, &off, &len);
1237 return parse_mp4_descr_arr(d, off, len);
1240 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1245 id_flags = avio_rb16(&d->pb);
1246 if (!(id_flags & 0x0020)) { // URL_Flag
1247 update_offsets(&d->pb, &off, &len);
1248 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1254 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1257 if (d->descr_count >= d->max_descr_count)
1258 return AVERROR_INVALIDDATA;
1259 ff_mp4_parse_es_descr(&d->pb, &es_id);
1260 d->active_descr = d->descr + (d->descr_count++);
1262 d->active_descr->es_id = es_id;
1263 update_offsets(&d->pb, &off, &len);
1264 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1265 update_offsets(&d->pb, &off, &len);
1267 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1268 d->active_descr = NULL;
1272 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1275 Mp4Descr *descr = d->active_descr;
1277 return AVERROR_INVALIDDATA;
1278 d->active_descr->dec_config_descr = av_malloc(len);
1279 if (!descr->dec_config_descr)
1280 return AVERROR(ENOMEM);
1281 descr->dec_config_descr_len = len;
1282 avio_read(&d->pb, descr->dec_config_descr, len);
1286 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1288 Mp4Descr *descr = d->active_descr;
1291 return AVERROR_INVALIDDATA;
1293 predefined = avio_r8(&d->pb);
1296 int flags = avio_r8(&d->pb);
1297 descr->sl.use_au_start = !!(flags & 0x80);
1298 descr->sl.use_au_end = !!(flags & 0x40);
1299 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1300 descr->sl.use_padding = !!(flags & 0x08);
1301 descr->sl.use_timestamps = !!(flags & 0x04);
1302 descr->sl.use_idle = !!(flags & 0x02);
1303 descr->sl.timestamp_res = avio_rb32(&d->pb);
1305 descr->sl.timestamp_len = avio_r8(&d->pb);
1306 if (descr->sl.timestamp_len > 64) {
1307 avpriv_request_sample(NULL, "timestamp_len > 64");
1308 descr->sl.timestamp_len = 64;
1309 return AVERROR_PATCHWELCOME;
1311 descr->sl.ocr_len = avio_r8(&d->pb);
1312 descr->sl.au_len = avio_r8(&d->pb);
1313 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1314 lengths = avio_rb16(&d->pb);
1315 descr->sl.degr_prior_len = lengths >> 12;
1316 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1317 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1319 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1324 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1328 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1329 update_offsets(&d->pb, &off, &len);
1330 if (len < 0 || len1 > len || len1 <= 0) {
1331 av_log(d->s, AV_LOG_ERROR,
1332 "Tag %x length violation new length %d bytes remaining %d\n",
1334 return AVERROR_INVALIDDATA;
1337 if (d->level++ >= MAX_LEVEL) {
1338 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1342 if (target_tag && tag != target_tag) {
1343 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1350 parse_MP4IODescrTag(d, off, len1);
1353 parse_MP4ODescrTag(d, off, len1);
1356 parse_MP4ESDescrTag(d, off, len1);
1358 case MP4DecConfigDescrTag:
1359 parse_MP4DecConfigDescrTag(d, off, len1);
1362 parse_MP4SLDescrTag(d, off, len1);
1369 avio_seek(&d->pb, off + len1, SEEK_SET);
1373 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1374 Mp4Descr *descr, int *descr_count, int max_descr_count)
1376 MP4DescrParseContext d;
1379 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1383 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1385 *descr_count = d.descr_count;
1389 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1390 Mp4Descr *descr, int *descr_count, int max_descr_count)
1392 MP4DescrParseContext d;
1395 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1399 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1401 *descr_count = d.descr_count;
1405 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1408 MpegTSContext *ts = filter->u.section_filter.opaque;
1410 const uint8_t *p, *p_end;
1412 int mp4_descr_count = 0;
1413 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1415 AVFormatContext *s = ts->stream;
1417 p_end = section + section_len - 4;
1419 if (parse_section_header(&h, &p, p_end) < 0)
1421 if (h.tid != M4OD_TID)
1424 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1425 MAX_MP4_DESCR_COUNT);
1427 for (pid = 0; pid < NB_PID_MAX; pid++) {
1430 for (i = 0; i < mp4_descr_count; i++) {
1433 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1435 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1436 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1439 pes = ts->pids[pid]->u.pes_filter.opaque;
1444 pes->sl = mp4_descr[i].sl;
1446 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1447 mp4_descr[i].dec_config_descr_len, 0,
1448 NULL, NULL, NULL, NULL);
1449 ff_mp4_read_dec_config_descr(s, st, &pb);
1450 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1451 st->codec->extradata_size > 0)
1452 st->need_parsing = 0;
1453 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1454 st->codec->extradata_size > 0)
1455 st->need_parsing = 0;
1457 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1459 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1460 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1461 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1462 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1463 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1464 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1467 for (i = 0; i < mp4_descr_count; i++)
1468 av_free(mp4_descr[i].dec_config_descr);
1471 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1472 const uint8_t **pp, const uint8_t *desc_list_end,
1473 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1476 const uint8_t *desc_end;
1477 int desc_len, desc_tag, desc_es_id;
1481 desc_tag = get8(pp, desc_list_end);
1483 return AVERROR_INVALIDDATA;
1484 desc_len = get8(pp, desc_list_end);
1486 return AVERROR_INVALIDDATA;
1487 desc_end = *pp + desc_len;
1488 if (desc_end > desc_list_end)
1489 return AVERROR_INVALIDDATA;
1491 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1493 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1494 stream_type == STREAM_TYPE_PRIVATE_DATA)
1495 mpegts_find_stream_type(st, desc_tag, DESC_types);
1498 case 0x1E: /* SL descriptor */
1499 desc_es_id = get16(pp, desc_end);
1500 if (ts && ts->pids[pid])
1501 ts->pids[pid]->es_id = desc_es_id;
1502 for (i = 0; i < mp4_descr_count; i++)
1503 if (mp4_descr[i].dec_config_descr_len &&
1504 mp4_descr[i].es_id == desc_es_id) {
1506 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1507 mp4_descr[i].dec_config_descr_len, 0,
1508 NULL, NULL, NULL, NULL);
1509 ff_mp4_read_dec_config_descr(fc, st, &pb);
1510 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1511 st->codec->extradata_size > 0)
1512 st->need_parsing = 0;
1513 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1514 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1517 case 0x1F: /* FMC descriptor */
1518 get16(pp, desc_end);
1519 if (mp4_descr_count > 0 &&
1520 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1521 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1523 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1524 mp4_descr->dec_config_descr_len, 0,
1525 NULL, NULL, NULL, NULL);
1526 ff_mp4_read_dec_config_descr(fc, st, &pb);
1527 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1528 st->codec->extradata_size > 0) {
1529 st->request_probe = st->need_parsing = 0;
1530 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1534 case 0x56: /* DVB teletext descriptor */
1536 uint8_t *extradata = NULL;
1537 int language_count = desc_len / 5;
1539 if (desc_len > 0 && desc_len % 5 != 0)
1540 return AVERROR_INVALIDDATA;
1542 if (language_count > 0) {
1543 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1544 if (language_count > sizeof(language) / 4) {
1545 language_count = sizeof(language) / 4;
1548 if (st->codec->extradata == NULL) {
1549 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1550 return AVERROR(ENOMEM);
1554 if (st->codec->extradata_size < language_count * 2)
1555 return AVERROR_INVALIDDATA;
1557 extradata = st->codec->extradata;
1559 for (i = 0; i < language_count; i++) {
1560 language[i * 4 + 0] = get8(pp, desc_end);
1561 language[i * 4 + 1] = get8(pp, desc_end);
1562 language[i * 4 + 2] = get8(pp, desc_end);
1563 language[i * 4 + 3] = ',';
1565 memcpy(extradata, *pp, 2);
1571 language[i * 4 - 1] = 0;
1572 av_dict_set(&st->metadata, "language", language, 0);
1576 case 0x59: /* subtitling descriptor */
1578 /* 8 bytes per DVB subtitle substream data:
1579 * ISO_639_language_code (3 bytes),
1580 * subtitling_type (1 byte),
1581 * composition_page_id (2 bytes),
1582 * ancillary_page_id (2 bytes) */
1583 int language_count = desc_len / 8;
1585 if (desc_len > 0 && desc_len % 8 != 0)
1586 return AVERROR_INVALIDDATA;
1588 if (language_count > 1) {
1589 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1592 if (language_count > 0) {
1595 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1596 if (language_count > sizeof(language) / 4) {
1597 language_count = sizeof(language) / 4;
1600 if (st->codec->extradata == NULL) {
1601 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1602 return AVERROR(ENOMEM);
1606 if (st->codec->extradata_size < language_count * 5)
1607 return AVERROR_INVALIDDATA;
1609 extradata = st->codec->extradata;
1611 for (i = 0; i < language_count; i++) {
1612 language[i * 4 + 0] = get8(pp, desc_end);
1613 language[i * 4 + 1] = get8(pp, desc_end);
1614 language[i * 4 + 2] = get8(pp, desc_end);
1615 language[i * 4 + 3] = ',';
1617 /* hearing impaired subtitles detection using subtitling_type */
1619 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1620 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1621 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1622 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1623 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1624 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1625 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1629 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1630 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1636 language[i * 4 - 1] = 0;
1637 av_dict_set(&st->metadata, "language", language, 0);
1641 case 0x0a: /* ISO 639 language descriptor */
1642 for (i = 0; i + 4 <= desc_len; i += 4) {
1643 language[i + 0] = get8(pp, desc_end);
1644 language[i + 1] = get8(pp, desc_end);
1645 language[i + 2] = get8(pp, desc_end);
1646 language[i + 3] = ',';
1647 switch (get8(pp, desc_end)) {
1649 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1652 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1655 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1660 language[i - 1] = 0;
1661 av_dict_set(&st->metadata, "language", language, 0);
1664 case 0x05: /* registration descriptor */
1665 st->codec->codec_tag = bytestream_get_le32(pp);
1666 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1667 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1668 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1670 case 0x52: /* stream identifier descriptor */
1671 st->stream_identifier = 1 + get8(pp, desc_end);
1673 case 0x26: /* metadata descriptor */
1674 if (get16(pp, desc_end) == 0xFFFF)
1676 if (get8(pp, desc_end) == 0xFF) {
1677 st->codec->codec_tag = bytestream_get_le32(pp);
1678 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1679 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1689 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1691 MpegTSContext *ts = filter->u.section_filter.opaque;
1692 SectionHeader h1, *h = &h1;
1695 const uint8_t *p, *p_end, *desc_list_end;
1696 int program_info_length, pcr_pid, pid, stream_type;
1698 uint32_t prog_reg_desc = 0; /* registration descriptor */
1700 int mp4_descr_count = 0;
1701 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1704 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1705 hex_dump_debug(ts->stream, section, section_len);
1707 p_end = section + section_len - 4;
1709 if (parse_section_header(h, &p, p_end) < 0)
1712 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1713 h->id, h->sec_num, h->last_sec_num);
1715 if (h->tid != PMT_TID)
1718 clear_program(ts, h->id);
1719 pcr_pid = get16(&p, p_end);
1723 add_pid_to_pmt(ts, h->id, pcr_pid);
1724 set_pcr_pid(ts->stream, h->id, pcr_pid);
1726 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1728 program_info_length = get16(&p, p_end);
1729 if (program_info_length < 0)
1731 program_info_length &= 0xfff;
1732 while (program_info_length >= 2) {
1734 tag = get8(&p, p_end);
1735 len = get8(&p, p_end);
1737 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1739 if (len > program_info_length - 2)
1740 // something else is broken, exit the program_descriptors_loop
1742 program_info_length -= len + 2;
1743 if (tag == 0x1d) { // IOD descriptor
1744 get8(&p, p_end); // scope
1745 get8(&p, p_end); // label
1747 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1748 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1749 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1750 prog_reg_desc = bytestream_get_le32(&p);
1755 p += program_info_length;
1759 // stop parsing after pmt, we found header
1760 if (!ts->stream->nb_streams)
1763 set_pmt_found(ts, h->id);
1769 stream_type = get8(&p, p_end);
1770 if (stream_type < 0)
1772 pid = get16(&p, p_end);
1776 if (pid == ts->current_pid)
1779 /* now create stream */
1780 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1781 pes = ts->pids[pid]->u.pes_filter.opaque;
1783 pes->st = avformat_new_stream(pes->stream, NULL);
1786 pes->st->id = pes->pid;
1789 } else if (stream_type != 0x13) {
1791 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1792 pes = add_pes_stream(ts, pid, pcr_pid);
1794 st = avformat_new_stream(pes->stream, NULL);
1800 int idx = ff_find_stream_index(ts->stream, pid);
1802 st = ts->stream->streams[idx];
1804 st = avformat_new_stream(ts->stream, NULL);
1808 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1815 if (pes && !pes->stream_type)
1816 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1818 add_pid_to_pmt(ts, h->id, pid);
1820 ff_program_add_stream_index(ts->stream, h->id, st->index);
1822 desc_list_len = get16(&p, p_end);
1823 if (desc_list_len < 0)
1825 desc_list_len &= 0xfff;
1826 desc_list_end = p + desc_list_len;
1827 if (desc_list_end > p_end)
1830 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1831 desc_list_end, mp4_descr,
1832 mp4_descr_count, pid, ts) < 0)
1835 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1836 stream_type == 0x83 && pes->sub_st) {
1837 ff_program_add_stream_index(ts->stream, h->id,
1838 pes->sub_st->index);
1839 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1845 if (!ts->pids[pcr_pid])
1846 mpegts_open_pcr_filter(ts, pcr_pid);
1849 for (i = 0; i < mp4_descr_count; i++)
1850 av_free(mp4_descr[i].dec_config_descr);
1853 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1855 MpegTSContext *ts = filter->u.section_filter.opaque;
1856 SectionHeader h1, *h = &h1;
1857 const uint8_t *p, *p_end;
1861 av_dlog(ts->stream, "PAT:\n");
1862 hex_dump_debug(ts->stream, section, section_len);
1864 p_end = section + section_len - 4;
1866 if (parse_section_header(h, &p, p_end) < 0)
1868 if (h->tid != PAT_TID)
1871 ts->stream->ts_id = h->id;
1875 sid = get16(&p, p_end);
1878 pmt_pid = get16(&p, p_end);
1883 if (pmt_pid == ts->current_pid)
1886 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1888 if (sid == 0x0000) {
1891 MpegTSFilter *fil = ts->pids[pmt_pid];
1892 program = av_new_program(ts->stream, sid);
1893 program->program_num = sid;
1894 program->pmt_pid = pmt_pid;
1896 if ( fil->type != MPEGTS_SECTION
1897 || fil->pid != pmt_pid
1898 || fil->u.section_filter.section_cb != pmt_cb)
1899 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1901 if (!ts->pids[pmt_pid])
1902 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1903 add_pat_entry(ts, sid);
1904 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1905 add_pid_to_pmt(ts, sid, pmt_pid);
1911 for (j=0; j<ts->stream->nb_programs; j++) {
1912 for (i = 0; i < ts->nb_prg; i++)
1913 if (ts->prg[i].id == ts->stream->programs[j]->id)
1916 clear_avprogram(ts, ts->stream->programs[j]->id);
1921 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1923 MpegTSContext *ts = filter->u.section_filter.opaque;
1924 SectionHeader h1, *h = &h1;
1925 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1926 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1927 char *name, *provider_name;
1929 av_dlog(ts->stream, "SDT:\n");
1930 hex_dump_debug(ts->stream, section, section_len);
1932 p_end = section + section_len - 4;
1934 if (parse_section_header(h, &p, p_end) < 0)
1936 if (h->tid != SDT_TID)
1938 onid = get16(&p, p_end);
1941 val = get8(&p, p_end);
1945 sid = get16(&p, p_end);
1948 val = get8(&p, p_end);
1951 desc_list_len = get16(&p, p_end);
1952 if (desc_list_len < 0)
1954 desc_list_len &= 0xfff;
1955 desc_list_end = p + desc_list_len;
1956 if (desc_list_end > p_end)
1959 desc_tag = get8(&p, desc_list_end);
1962 desc_len = get8(&p, desc_list_end);
1963 desc_end = p + desc_len;
1964 if (desc_end > desc_list_end)
1967 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1968 desc_tag, desc_len);
1972 service_type = get8(&p, p_end);
1973 if (service_type < 0)
1975 provider_name = getstr8(&p, p_end);
1978 name = getstr8(&p, p_end);
1980 AVProgram *program = av_new_program(ts->stream, sid);
1982 av_dict_set(&program->metadata, "service_name", name, 0);
1983 av_dict_set(&program->metadata, "service_provider",
1988 av_free(provider_name);
1999 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2000 const uint8_t *packet);
2002 /* handle one TS packet */
2003 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2005 AVFormatContext *s = ts->stream;
2007 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2008 has_adaptation, has_payload;
2009 const uint8_t *p, *p_end;
2012 pid = AV_RB16(packet + 1) & 0x1fff;
2013 if (pid && discard_pid(ts, pid))
2015 is_start = packet[1] & 0x40;
2016 tss = ts->pids[pid];
2017 if (ts->auto_guess && tss == NULL && is_start) {
2018 add_pes_stream(ts, pid, -1);
2019 tss = ts->pids[pid];
2023 ts->current_pid = pid;
2025 afc = (packet[3] >> 4) & 3;
2026 if (afc == 0) /* reserved value */
2028 has_adaptation = afc & 2;
2029 has_payload = afc & 1;
2030 is_discontinuity = has_adaptation &&
2031 packet[4] != 0 && /* with length > 0 */
2032 (packet[5] & 0x80); /* and discontinuity indicated */
2034 /* continuity check (currently not used) */
2035 cc = (packet[3] & 0xf);
2036 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2037 cc_ok = pid == 0x1FFF || // null packet PID
2044 av_log(ts->stream, AV_LOG_DEBUG,
2045 "Continuity check failed for pid %d expected %d got %d\n",
2046 pid, expected_cc, cc);
2047 if (tss->type == MPEGTS_PES) {
2048 PESContext *pc = tss->u.pes_filter.opaque;
2049 pc->flags |= AV_PKT_FLAG_CORRUPT;
2053 if (!has_payload && tss->type != MPEGTS_PCR)
2056 if (has_adaptation) {
2057 /* skip adaptation field */
2060 /* if past the end of packet, ignore */
2061 p_end = packet + TS_PACKET_SIZE;
2062 if (p > p_end || (p == p_end && tss->type != MPEGTS_PCR))
2065 pos = avio_tell(ts->stream->pb);
2067 av_assert0(pos >= TS_PACKET_SIZE);
2068 ts->pos47_full = pos - TS_PACKET_SIZE;
2071 if (tss->type == MPEGTS_SECTION) {
2073 /* pointer field present */
2075 if (p + len > p_end)
2078 /* write remaining section bytes */
2079 write_section_data(s, tss,
2081 /* check whether filter has been closed */
2087 write_section_data(s, tss,
2092 write_section_data(s, tss,
2097 // stop find_stream_info from waiting for more streams
2098 // when all programs have received a PMT
2099 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2101 for (i = 0; i < ts->nb_prg; i++) {
2102 if (!ts->prg[i].pmt_found)
2105 if (i == ts->nb_prg && ts->nb_prg > 0) {
2106 if (ts->stream->nb_streams > 1 || pos > 100000) {
2107 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2108 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2117 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2118 tss->last_pcr = pcr_h * 300 + pcr_l;
2119 // Note: The position here points actually behind the current packet.
2120 if (tss->type == MPEGTS_PES) {
2121 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2122 pos - ts->raw_packet_size)) < 0)
2130 static void reanalyze(MpegTSContext *ts) {
2131 AVIOContext *pb = ts->stream->pb;
2132 int64_t pos = avio_tell(pb);
2135 pos -= ts->pos47_full;
2136 if (pos == TS_PACKET_SIZE) {
2137 ts->size_stat[0] ++;
2138 } else if (pos == TS_DVHS_PACKET_SIZE) {
2139 ts->size_stat[1] ++;
2140 } else if (pos == TS_FEC_PACKET_SIZE) {
2141 ts->size_stat[2] ++;
2144 ts->size_stat_count ++;
2145 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2147 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2148 newsize = TS_PACKET_SIZE;
2149 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2150 newsize = TS_DVHS_PACKET_SIZE;
2151 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2152 newsize = TS_FEC_PACKET_SIZE;
2154 if (newsize && newsize != ts->raw_packet_size) {
2155 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2156 ts->raw_packet_size = newsize;
2158 ts->size_stat_count = 0;
2159 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2163 /* XXX: try to find a better synchro over several packets (use
2164 * get_packet_size() ?) */
2165 static int mpegts_resync(AVFormatContext *s)
2167 AVIOContext *pb = s->pb;
2170 for (i = 0; i < MAX_RESYNC_SIZE; i++) {
2175 avio_seek(pb, -1, SEEK_CUR);
2176 reanalyze(s->priv_data);
2180 av_log(s, AV_LOG_ERROR,
2181 "max resync size reached, could not find sync byte\n");
2183 return AVERROR_INVALIDDATA;
2186 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2187 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2188 const uint8_t **data)
2190 AVIOContext *pb = s->pb;
2194 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2195 if (len != TS_PACKET_SIZE)
2196 return len < 0 ? len : AVERROR_EOF;
2197 /* check packet sync byte */
2198 if ((*data)[0] != 0x47) {
2199 /* find a new packet start */
2200 uint64_t pos = avio_tell(pb);
2201 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2203 if (mpegts_resync(s) < 0)
2204 return AVERROR(EAGAIN);
2214 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2216 AVIOContext *pb = s->pb;
2217 int skip = raw_packet_size - TS_PACKET_SIZE;
2219 avio_skip(pb, skip);
2222 static int handle_packets(MpegTSContext *ts, int nb_packets)
2224 AVFormatContext *s = ts->stream;
2225 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2226 const uint8_t *data;
2227 int packet_num, ret = 0;
2229 if (avio_tell(s->pb) != ts->last_pos) {
2231 av_dlog(ts->stream, "Skipping after seek\n");
2232 /* seek detected, flush pes buffer */
2233 for (i = 0; i < NB_PID_MAX; i++) {
2235 if (ts->pids[i]->type == MPEGTS_PES) {
2236 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2237 av_buffer_unref(&pes->buffer);
2238 pes->data_index = 0;
2239 pes->state = MPEGTS_SKIP; /* skip until pes header */
2241 ts->pids[i]->last_cc = -1;
2242 ts->pids[i]->last_pcr = -1;
2249 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2252 if (nb_packets != 0 && packet_num >= nb_packets ||
2253 ts->stop_parse > 1) {
2254 ret = AVERROR(EAGAIN);
2257 if (ts->stop_parse > 0)
2260 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2263 ret = handle_packet(ts, data);
2264 finished_reading_packet(s, ts->raw_packet_size);
2268 ts->last_pos = avio_tell(s->pb);
2272 static int mpegts_probe(AVProbeData *p)
2274 const int size = p->buf_size;
2278 int check_count = size / TS_FEC_PACKET_SIZE;
2279 #define CHECK_COUNT 10
2280 #define CHECK_BLOCK 100
2282 if (check_count < CHECK_COUNT)
2283 return AVERROR_INVALIDDATA;
2285 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2286 int left = FFMIN(check_count - i, CHECK_BLOCK);
2287 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2288 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2289 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2290 score = FFMAX3(score, dvhs_score, fec_score);
2292 maxscore = FFMAX(maxscore, score);
2295 sumscore = sumscore * CHECK_COUNT / check_count;
2296 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2298 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2300 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2301 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2303 return AVERROR_INVALIDDATA;
2306 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2307 * (-1) if not available */
2308 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2310 int afc, len, flags;
2314 afc = (packet[3] >> 4) & 3;
2316 return AVERROR_INVALIDDATA;
2321 return AVERROR_INVALIDDATA;
2324 if (!(flags & 0x10))
2325 return AVERROR_INVALIDDATA;
2327 return AVERROR_INVALIDDATA;
2329 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2330 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2334 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2336 /* NOTE: We attempt to seek on non-seekable files as well, as the
2337 * probe buffer usually is big enough. Only warn if the seek failed
2338 * on files where the seek should work. */
2339 if (avio_seek(pb, pos, SEEK_SET) < 0)
2340 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2343 static int mpegts_read_header(AVFormatContext *s)
2345 MpegTSContext *ts = s->priv_data;
2346 AVIOContext *pb = s->pb;
2347 uint8_t buf[8 * 1024] = {0};
2351 ffio_ensure_seekback(pb, s->probesize);
2353 /* read the first 8192 bytes to get packet size */
2354 pos = avio_tell(pb);
2355 len = avio_read(pb, buf, sizeof(buf));
2356 ts->raw_packet_size = get_packet_size(buf, len);
2357 if (ts->raw_packet_size <= 0) {
2358 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2359 ts->raw_packet_size = TS_PACKET_SIZE;
2364 if (s->iformat == &ff_mpegts_demuxer) {
2367 /* first do a scan to get all the services */
2368 seek_back(s, pb, pos);
2370 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2372 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2374 handle_packets(ts, s->probesize / ts->raw_packet_size);
2375 /* if could not find service, enable auto_guess */
2379 av_dlog(ts->stream, "tuning done\n");
2381 s->ctx_flags |= AVFMTCTX_NOHEADER;
2384 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2385 int64_t pcrs[2], pcr_h;
2386 int packet_count[2];
2387 uint8_t packet[TS_PACKET_SIZE];
2388 const uint8_t *data;
2390 /* only read packets */
2392 st = avformat_new_stream(s, NULL);
2394 return AVERROR(ENOMEM);
2395 avpriv_set_pts_info(st, 60, 1, 27000000);
2396 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2397 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2399 /* we iterate until we find two PCRs to estimate the bitrate */
2404 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2407 pid = AV_RB16(data + 1) & 0x1fff;
2408 if ((pcr_pid == -1 || pcr_pid == pid) &&
2409 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2410 finished_reading_packet(s, ts->raw_packet_size);
2412 packet_count[nb_pcrs] = nb_packets;
2413 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2418 finished_reading_packet(s, ts->raw_packet_size);
2423 /* NOTE1: the bitrate is computed without the FEC */
2424 /* NOTE2: it is only the bitrate of the start of the stream */
2425 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2426 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2427 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2428 st->codec->bit_rate = s->bit_rate;
2429 st->start_time = ts->cur_pcr;
2430 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2431 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2434 seek_back(s, pb, pos);
2438 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2440 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2442 MpegTSContext *ts = s->priv_data;
2444 int64_t pcr_h, next_pcr_h, pos;
2445 int pcr_l, next_pcr_l;
2446 uint8_t pcr_buf[12];
2447 const uint8_t *data;
2449 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2450 return AVERROR(ENOMEM);
2451 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2452 pkt->pos = avio_tell(s->pb);
2454 av_free_packet(pkt);
2457 if (data != pkt->data)
2458 memcpy(pkt->data, data, ts->raw_packet_size);
2459 finished_reading_packet(s, ts->raw_packet_size);
2460 if (ts->mpeg2ts_compute_pcr) {
2461 /* compute exact PCR for each packet */
2462 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2463 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2464 pos = avio_tell(s->pb);
2465 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2466 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2467 avio_read(s->pb, pcr_buf, 12);
2468 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2469 /* XXX: not precise enough */
2471 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2476 avio_seek(s->pb, pos, SEEK_SET);
2477 /* no next PCR found: we use previous increment */
2478 ts->cur_pcr = pcr_h * 300 + pcr_l;
2480 pkt->pts = ts->cur_pcr;
2481 pkt->duration = ts->pcr_incr;
2482 ts->cur_pcr += ts->pcr_incr;
2484 pkt->stream_index = 0;
2488 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2490 MpegTSContext *ts = s->priv_data;
2495 ret = handle_packets(ts, 0);
2497 av_free_packet(ts->pkt);
2498 /* flush pes data left */
2499 for (i = 0; i < NB_PID_MAX; i++)
2500 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2501 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2502 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2503 new_pes_packet(pes, pkt);
2504 pes->state = MPEGTS_SKIP;
2511 if (!ret && pkt->size < 0)
2512 ret = AVERROR(EINTR);
2516 static void mpegts_free(MpegTSContext *ts)
2522 for (i = 0; i < NB_PID_MAX; i++)
2524 mpegts_close_filter(ts, ts->pids[i]);
2527 static int mpegts_read_close(AVFormatContext *s)
2529 MpegTSContext *ts = s->priv_data;
2534 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2535 int64_t *ppos, int64_t pos_limit)
2537 MpegTSContext *ts = s->priv_data;
2538 int64_t pos, timestamp;
2539 uint8_t buf[TS_PACKET_SIZE];
2540 int pcr_l, pcr_pid =
2541 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2542 int pos47 = ts->pos47_full % ts->raw_packet_size;
2544 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2545 ts->raw_packet_size + pos47;
2546 while(pos < pos_limit) {
2547 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2548 return AV_NOPTS_VALUE;
2549 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2550 return AV_NOPTS_VALUE;
2551 if (buf[0] != 0x47) {
2552 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2553 if (mpegts_resync(s) < 0)
2554 return AV_NOPTS_VALUE;
2555 pos = avio_tell(s->pb);
2558 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2559 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2563 pos += ts->raw_packet_size;
2566 return AV_NOPTS_VALUE;
2569 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2570 int64_t *ppos, int64_t pos_limit)
2572 MpegTSContext *ts = s->priv_data;
2574 int pos47 = ts->pos47_full % ts->raw_packet_size;
2575 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2576 ff_read_frame_flush(s);
2577 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2578 return AV_NOPTS_VALUE;
2579 while(pos < pos_limit) {
2582 av_init_packet(&pkt);
2583 ret = av_read_frame(s, &pkt);
2585 return AV_NOPTS_VALUE;
2586 av_free_packet(&pkt);
2587 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2588 ff_reduce_index(s, pkt.stream_index);
2589 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2590 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2598 return AV_NOPTS_VALUE;
2601 /**************************************************************/
2602 /* parsing functions - called from other demuxers such as RTP */
2604 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2608 ts = av_mallocz(sizeof(MpegTSContext));
2611 /* no stream case, currently used by RTP */
2612 ts->raw_packet_size = TS_PACKET_SIZE;
2615 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2616 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2621 /* return the consumed length if a packet was output, or -1 if no
2622 * packet is output */
2623 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2624 const uint8_t *buf, int len)
2632 if (len < TS_PACKET_SIZE)
2633 return AVERROR_INVALIDDATA;
2634 if (buf[0] != 0x47) {
2638 handle_packet(ts, buf);
2639 buf += TS_PACKET_SIZE;
2640 len -= TS_PACKET_SIZE;
2641 if (ts->stop_parse == 1)
2648 void ff_mpegts_parse_close(MpegTSContext *ts)
2654 AVInputFormat ff_mpegts_demuxer = {
2656 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2657 .priv_data_size = sizeof(MpegTSContext),
2658 .read_probe = mpegts_probe,
2659 .read_header = mpegts_read_header,
2660 .read_packet = mpegts_read_packet,
2661 .read_close = mpegts_read_close,
2662 .read_timestamp = mpegts_get_dts,
2663 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2664 .priv_class = &mpegts_class,
2667 AVInputFormat ff_mpegtsraw_demuxer = {
2668 .name = "mpegtsraw",
2669 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2670 .priv_data_size = sizeof(MpegTSContext),
2671 .read_header = mpegts_read_header,
2672 .read_packet = mpegts_raw_read_packet,
2673 .read_close = mpegts_read_close,
2674 .read_timestamp = mpegts_get_dts,
2675 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2676 .priv_class = &mpegtsraw_class,