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(MpegTSContext *ts, MpegTSFilter *tss1,
361 const uint8_t *buf, int buf_size, int is_start)
363 MpegTSSectionFilter *tss = &tss1->u.section_filter;
367 memcpy(tss->section_buf, buf, buf_size);
368 tss->section_index = buf_size;
369 tss->section_h_size = -1;
370 tss->end_of_section_reached = 0;
372 if (tss->end_of_section_reached)
374 len = 4096 - tss->section_index;
377 memcpy(tss->section_buf + tss->section_index, buf, len);
378 tss->section_index += len;
381 /* compute section length if possible */
382 if (tss->section_h_size == -1 && tss->section_index >= 3) {
383 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
386 tss->section_h_size = len;
389 if (tss->section_h_size != -1 &&
390 tss->section_index >= tss->section_h_size) {
392 tss->end_of_section_reached = 1;
394 if (tss->check_crc) {
395 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
397 ts->crc_validity[ tss1->pid ] = 100;
398 }else if (ts->crc_validity[ tss1->pid ] > -10) {
399 ts->crc_validity[ tss1->pid ]--;
404 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
408 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
409 enum MpegTSFilterType type)
411 MpegTSFilter *filter;
413 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
415 if (pid >= NB_PID_MAX || ts->pids[pid])
417 filter = av_mallocz(sizeof(MpegTSFilter));
420 ts->pids[pid] = filter;
425 filter->last_cc = -1;
426 filter->last_pcr= -1;
431 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
433 SectionCallback *section_cb,
437 MpegTSFilter *filter;
438 MpegTSSectionFilter *sec;
440 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
442 sec = &filter->u.section_filter;
443 sec->section_cb = section_cb;
444 sec->opaque = opaque;
445 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
446 sec->check_crc = check_crc;
447 if (!sec->section_buf) {
454 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
458 MpegTSFilter *filter;
459 MpegTSPESFilter *pes;
461 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
464 pes = &filter->u.pes_filter;
465 pes->pes_cb = pes_cb;
466 pes->opaque = opaque;
470 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
472 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
475 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
480 if (filter->type == MPEGTS_SECTION)
481 av_freep(&filter->u.section_filter.section_buf);
482 else if (filter->type == MPEGTS_PES) {
483 PESContext *pes = filter->u.pes_filter.opaque;
484 av_buffer_unref(&pes->buffer);
485 /* referenced private data will be freed later in
486 * avformat_close_input */
487 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
488 av_freep(&filter->u.pes_filter.opaque);
493 ts->pids[pid] = NULL;
496 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
498 int stat[TS_MAX_PACKET_SIZE];
502 memset(stat, 0, packet_size * sizeof(*stat));
504 for (i = 0; i < size - 3; i++) {
505 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
506 int x = i % packet_size;
508 if (stat[x] > best_score) {
509 best_score = stat[x];
519 /* autodetect fec presence. Must have at least 1024 bytes */
520 static int get_packet_size(const uint8_t *buf, int size)
522 int score, fec_score, dvhs_score;
524 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
525 return AVERROR_INVALIDDATA;
527 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
528 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
529 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
530 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
531 score, dvhs_score, fec_score);
533 if (score > fec_score && score > dvhs_score)
534 return TS_PACKET_SIZE;
535 else if (dvhs_score > score && dvhs_score > fec_score)
536 return TS_DVHS_PACKET_SIZE;
537 else if (score < fec_score && dvhs_score < fec_score)
538 return TS_FEC_PACKET_SIZE;
540 return AVERROR_INVALIDDATA;
543 typedef struct SectionHeader {
548 uint8_t last_sec_num;
551 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
558 return AVERROR_INVALIDDATA;
564 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
570 if ((p + 1) >= p_end)
571 return AVERROR_INVALIDDATA;
578 /* read and allocate a DVB string preceded by its length */
579 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
586 len = get8(&p, p_end);
589 if ((p + len) > p_end)
591 str = av_malloc(len + 1);
601 static int parse_section_header(SectionHeader *h,
602 const uint8_t **pp, const uint8_t *p_end)
606 val = get8(pp, p_end);
611 val = get16(pp, p_end);
615 val = get8(pp, p_end);
618 h->version = (val >> 1) & 0x1f;
619 val = get8(pp, p_end);
623 val = get8(pp, p_end);
626 h->last_sec_num = val;
631 uint32_t stream_type;
632 enum AVMediaType codec_type;
633 enum AVCodecID codec_id;
636 static const StreamType ISO_types[] = {
637 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
638 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
639 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
640 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
641 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
642 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
643 /* Makito encoder sets stream type 0x11 for AAC,
644 * so auto-detect LOAS/LATM instead of hardcoding it. */
645 #if !CONFIG_LOAS_DEMUXER
646 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
648 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
649 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
650 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
651 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
652 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
656 static const StreamType HDMV_types[] = {
657 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
658 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
659 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
660 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
661 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
662 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
663 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
664 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
665 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
666 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
671 static const StreamType MISC_types[] = {
672 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
673 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
677 static const StreamType REGD_types[] = {
678 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
679 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
680 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
681 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
682 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
683 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
684 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
685 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
686 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
690 static const StreamType METADATA_types[] = {
691 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
692 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
696 /* descriptor present */
697 static const StreamType DESC_types[] = {
698 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
699 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
700 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
701 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
702 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
706 static void mpegts_find_stream_type(AVStream *st,
707 uint32_t stream_type,
708 const StreamType *types)
710 if (avcodec_is_open(st->codec)) {
711 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
715 for (; types->stream_type; types++)
716 if (stream_type == types->stream_type) {
717 st->codec->codec_type = types->codec_type;
718 st->codec->codec_id = types->codec_id;
719 st->request_probe = 0;
724 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
725 uint32_t stream_type, uint32_t prog_reg_desc)
727 int old_codec_type = st->codec->codec_type;
728 int old_codec_id = st->codec->codec_id;
730 if (avcodec_is_open(st->codec)) {
731 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
735 avpriv_set_pts_info(st, 33, 1, 90000);
737 st->codec->codec_type = AVMEDIA_TYPE_DATA;
738 st->codec->codec_id = AV_CODEC_ID_NONE;
739 st->need_parsing = AVSTREAM_PARSE_FULL;
741 pes->stream_type = stream_type;
743 av_log(pes->stream, AV_LOG_DEBUG,
744 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
745 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
747 st->codec->codec_tag = pes->stream_type;
749 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
750 if ((prog_reg_desc == AV_RL32("HDMV") ||
751 prog_reg_desc == AV_RL32("HDPR")) &&
752 st->codec->codec_id == AV_CODEC_ID_NONE) {
753 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
754 if (pes->stream_type == 0x83) {
755 // HDMV TrueHD streams also contain an AC3 coded version of the
756 // audio track - add a second stream for this
758 // priv_data cannot be shared between streams
759 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
761 return AVERROR(ENOMEM);
762 memcpy(sub_pes, pes, sizeof(*sub_pes));
764 sub_st = avformat_new_stream(pes->stream, NULL);
767 return AVERROR(ENOMEM);
770 sub_st->id = pes->pid;
771 avpriv_set_pts_info(sub_st, 33, 1, 90000);
772 sub_st->priv_data = sub_pes;
773 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
774 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
775 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
776 sub_pes->sub_st = pes->sub_st = sub_st;
779 if (st->codec->codec_id == AV_CODEC_ID_NONE)
780 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
781 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
782 st->codec->codec_id = old_codec_id;
783 st->codec->codec_type = old_codec_type;
789 static void reset_pes_packet_state(PESContext *pes)
791 pes->pts = AV_NOPTS_VALUE;
792 pes->dts = AV_NOPTS_VALUE;
795 av_buffer_unref(&pes->buffer);
798 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
802 pkt->buf = pes->buffer;
803 pkt->data = pes->buffer->data;
804 pkt->size = pes->data_index;
806 if (pes->total_size != MAX_PES_PAYLOAD &&
807 pes->pes_header_size + pes->data_index != pes->total_size +
809 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
810 pes->flags |= AV_PKT_FLAG_CORRUPT;
812 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
814 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
815 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
816 pkt->stream_index = pes->sub_st->index;
818 pkt->stream_index = pes->st->index;
821 /* store position of first TS packet of this PES packet */
822 pkt->pos = pes->ts_packet_pos;
823 pkt->flags = pes->flags;
826 reset_pes_packet_state(pes);
829 static uint64_t get_ts64(GetBitContext *gb, int bits)
831 if (get_bits_left(gb) < bits)
832 return AV_NOPTS_VALUE;
833 return get_bits64(gb, bits);
836 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
837 const uint8_t *buf, int buf_size)
840 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
841 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
842 int dts_flag = -1, cts_flag = -1;
843 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
845 init_get_bits(&gb, buf, buf_size * 8);
847 if (sl->use_au_start)
848 au_start_flag = get_bits1(&gb);
850 au_end_flag = get_bits1(&gb);
851 if (!sl->use_au_start && !sl->use_au_end)
852 au_start_flag = au_end_flag = 1;
854 ocr_flag = get_bits1(&gb);
856 idle_flag = get_bits1(&gb);
858 padding_flag = get_bits1(&gb);
860 padding_bits = get_bits(&gb, 3);
862 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
863 if (sl->packet_seq_num_len)
864 skip_bits_long(&gb, sl->packet_seq_num_len);
865 if (sl->degr_prior_len)
867 skip_bits(&gb, sl->degr_prior_len);
869 skip_bits_long(&gb, sl->ocr_len);
871 if (sl->use_rand_acc_pt)
873 if (sl->au_seq_num_len > 0)
874 skip_bits_long(&gb, sl->au_seq_num_len);
875 if (sl->use_timestamps) {
876 dts_flag = get_bits1(&gb);
877 cts_flag = get_bits1(&gb);
880 if (sl->inst_bitrate_len)
881 inst_bitrate_flag = get_bits1(&gb);
883 dts = get_ts64(&gb, sl->timestamp_len);
885 cts = get_ts64(&gb, sl->timestamp_len);
887 skip_bits_long(&gb, sl->au_len);
888 if (inst_bitrate_flag)
889 skip_bits_long(&gb, sl->inst_bitrate_len);
892 if (dts != AV_NOPTS_VALUE)
894 if (cts != AV_NOPTS_VALUE)
897 if (sl->timestamp_len && sl->timestamp_res)
898 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
900 return (get_bits_count(&gb) + 7) >> 3;
903 /* return non zero if a packet could be constructed */
904 static int mpegts_push_data(MpegTSFilter *filter,
905 const uint8_t *buf, int buf_size, int is_start,
908 PESContext *pes = filter->u.pes_filter.opaque;
909 MpegTSContext *ts = pes->ts;
917 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
918 new_pes_packet(pes, ts->pkt);
921 reset_pes_packet_state(pes);
923 pes->state = MPEGTS_HEADER;
924 pes->ts_packet_pos = pos;
927 while (buf_size > 0) {
928 switch (pes->state) {
930 len = PES_START_SIZE - pes->data_index;
933 memcpy(pes->header + pes->data_index, p, len);
934 pes->data_index += len;
937 if (pes->data_index == PES_START_SIZE) {
938 /* we got all the PES or section header. We can now
940 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
941 pes->header[2] == 0x01) {
942 /* it must be an mpeg2 PES stream */
943 code = pes->header[3] | 0x100;
944 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
947 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
949 pes->sub_st->discard == AVDISCARD_ALL)) ||
950 code == 0x1be) /* padding_stream */
953 /* stream not present in PMT */
955 pes->st = avformat_new_stream(ts->stream, NULL);
957 return AVERROR(ENOMEM);
958 pes->st->id = pes->pid;
959 mpegts_set_stream_info(pes->st, pes, 0, 0);
962 pes->total_size = AV_RB16(pes->header + 4);
963 /* NOTE: a zero total size means the PES size is
965 if (!pes->total_size)
966 pes->total_size = MAX_PES_PAYLOAD;
968 /* allocate pes buffer */
969 pes->buffer = av_buffer_alloc(pes->total_size +
970 FF_INPUT_BUFFER_PADDING_SIZE);
972 return AVERROR(ENOMEM);
974 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
975 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
976 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
977 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
978 pes->state = MPEGTS_PESHEADER;
979 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
981 "pid=%x stream_type=%x probing\n",
984 pes->st->request_probe = 1;
987 pes->state = MPEGTS_PAYLOAD;
991 /* otherwise, it should be a table */
994 pes->state = MPEGTS_SKIP;
999 /**********************************************/
1000 /* PES packing parsing */
1001 case MPEGTS_PESHEADER:
1002 len = PES_HEADER_SIZE - pes->data_index;
1004 return AVERROR_INVALIDDATA;
1007 memcpy(pes->header + pes->data_index, p, len);
1008 pes->data_index += len;
1011 if (pes->data_index == PES_HEADER_SIZE) {
1012 pes->pes_header_size = pes->header[8] + 9;
1013 pes->state = MPEGTS_PESHEADER_FILL;
1016 case MPEGTS_PESHEADER_FILL:
1017 len = pes->pes_header_size - pes->data_index;
1019 return AVERROR_INVALIDDATA;
1022 memcpy(pes->header + pes->data_index, p, len);
1023 pes->data_index += len;
1026 if (pes->data_index == pes->pes_header_size) {
1028 unsigned int flags, pes_ext, skip;
1030 flags = pes->header[7];
1031 r = pes->header + 9;
1032 pes->pts = AV_NOPTS_VALUE;
1033 pes->dts = AV_NOPTS_VALUE;
1034 if ((flags & 0xc0) == 0x80) {
1035 pes->dts = pes->pts = ff_parse_pes_pts(r);
1037 } else if ((flags & 0xc0) == 0xc0) {
1038 pes->pts = ff_parse_pes_pts(r);
1040 pes->dts = ff_parse_pes_pts(r);
1043 pes->extended_stream_id = -1;
1044 if (flags & 0x01) { /* PES extension */
1046 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1047 skip = (pes_ext >> 4) & 0xb;
1050 if ((pes_ext & 0x41) == 0x01 &&
1051 (r + 2) <= (pes->header + pes->pes_header_size)) {
1052 /* PES extension 2 */
1053 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1054 pes->extended_stream_id = r[1];
1058 /* we got the full header. We parse it and get the payload */
1059 pes->state = MPEGTS_PAYLOAD;
1060 pes->data_index = 0;
1061 if (pes->stream_type == 0x12 && buf_size > 0) {
1062 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1064 pes->pes_header_size += sl_header_bytes;
1065 p += sl_header_bytes;
1066 buf_size -= sl_header_bytes;
1068 if (pes->stream_type == 0x15 && buf_size >= 5) {
1069 /* skip metadata access unit header */
1070 pes->pes_header_size += 5;
1074 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1075 AVProgram *p = NULL;
1076 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1077 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1078 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1080 AVStream *st = NULL;
1081 if (f->type == MPEGTS_PES) {
1082 PESContext *pcrpes = f->u.pes_filter.opaque;
1085 } else if (f->type == MPEGTS_PCR) {
1087 for (i = 0; i < p->nb_stream_indexes; i++) {
1088 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1089 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1093 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1094 // teletext packets do not always have correct timestamps,
1095 // the standard says they should be handled after 40.6 ms at most,
1096 // and the pcr error to this packet should be no more than 100 ms.
1097 // TODO: we should interpolate the PCR, not just use the last one
1098 int64_t pcr = f->last_pcr / 300;
1099 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1100 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1101 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1102 pes->pts = pes->dts = pcr;
1103 } else if (pes->dts > pcr + 3654 + 9000) {
1104 pes->pts = pes->dts = pcr + 3654 + 9000;
1114 case MPEGTS_PAYLOAD:
1116 if (pes->data_index > 0 &&
1117 pes->data_index + buf_size > pes->total_size) {
1118 new_pes_packet(pes, ts->pkt);
1119 pes->total_size = MAX_PES_PAYLOAD;
1120 pes->buffer = av_buffer_alloc(pes->total_size +
1121 FF_INPUT_BUFFER_PADDING_SIZE);
1123 return AVERROR(ENOMEM);
1125 } else if (pes->data_index == 0 &&
1126 buf_size > pes->total_size) {
1127 // pes packet size is < ts size packet and pes data is padded with 0xff
1128 // not sure if this is legal in ts but see issue #2392
1129 buf_size = pes->total_size;
1131 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1132 pes->data_index += buf_size;
1133 /* emit complete packets with known packet size
1134 * decreases demuxer delay for infrequent packets like subtitles from
1135 * a couple of seconds to milliseconds for properly muxed files.
1136 * total_size is the number of bytes following pes_packet_length
1137 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1138 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1139 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1141 new_pes_packet(pes, ts->pkt);
1155 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1160 /* if no pid found, then add a pid context */
1161 pes = av_mallocz(sizeof(PESContext));
1165 pes->stream = ts->stream;
1167 pes->pcr_pid = pcr_pid;
1168 pes->state = MPEGTS_SKIP;
1169 pes->pts = AV_NOPTS_VALUE;
1170 pes->dts = AV_NOPTS_VALUE;
1171 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1184 Mp4Descr *active_descr;
1186 int max_descr_count;
1188 int predefined_SLConfigDescriptor_seen;
1189 } MP4DescrParseContext;
1191 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1192 const uint8_t *buf, unsigned size,
1193 Mp4Descr *descr, int max_descr_count)
1196 if (size > (1 << 30))
1197 return AVERROR_INVALIDDATA;
1199 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1200 NULL, NULL, NULL, NULL)) < 0)
1207 d->active_descr = NULL;
1208 d->max_descr_count = max_descr_count;
1213 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1215 int64_t new_off = avio_tell(pb);
1216 (*len) -= new_off - *off;
1220 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1223 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1226 int ret = parse_mp4_descr(d, off, len, 0);
1229 update_offsets(&d->pb, &off, &len);
1234 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1236 avio_rb16(&d->pb); // ID
1242 update_offsets(&d->pb, &off, &len);
1243 return parse_mp4_descr_arr(d, off, len);
1246 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1251 id_flags = avio_rb16(&d->pb);
1252 if (!(id_flags & 0x0020)) { // URL_Flag
1253 update_offsets(&d->pb, &off, &len);
1254 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1260 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1263 if (d->descr_count >= d->max_descr_count)
1264 return AVERROR_INVALIDDATA;
1265 ff_mp4_parse_es_descr(&d->pb, &es_id);
1266 d->active_descr = d->descr + (d->descr_count++);
1268 d->active_descr->es_id = es_id;
1269 update_offsets(&d->pb, &off, &len);
1270 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1271 update_offsets(&d->pb, &off, &len);
1273 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1274 d->active_descr = NULL;
1278 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1281 Mp4Descr *descr = d->active_descr;
1283 return AVERROR_INVALIDDATA;
1284 d->active_descr->dec_config_descr = av_malloc(len);
1285 if (!descr->dec_config_descr)
1286 return AVERROR(ENOMEM);
1287 descr->dec_config_descr_len = len;
1288 avio_read(&d->pb, descr->dec_config_descr, len);
1292 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1294 Mp4Descr *descr = d->active_descr;
1297 return AVERROR_INVALIDDATA;
1299 predefined = avio_r8(&d->pb);
1302 int flags = avio_r8(&d->pb);
1303 descr->sl.use_au_start = !!(flags & 0x80);
1304 descr->sl.use_au_end = !!(flags & 0x40);
1305 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1306 descr->sl.use_padding = !!(flags & 0x08);
1307 descr->sl.use_timestamps = !!(flags & 0x04);
1308 descr->sl.use_idle = !!(flags & 0x02);
1309 descr->sl.timestamp_res = avio_rb32(&d->pb);
1311 descr->sl.timestamp_len = avio_r8(&d->pb);
1312 if (descr->sl.timestamp_len > 64) {
1313 avpriv_request_sample(NULL, "timestamp_len > 64");
1314 descr->sl.timestamp_len = 64;
1315 return AVERROR_PATCHWELCOME;
1317 descr->sl.ocr_len = avio_r8(&d->pb);
1318 descr->sl.au_len = avio_r8(&d->pb);
1319 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1320 lengths = avio_rb16(&d->pb);
1321 descr->sl.degr_prior_len = lengths >> 12;
1322 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1323 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1324 } else if (!d->predefined_SLConfigDescriptor_seen){
1325 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1326 d->predefined_SLConfigDescriptor_seen = 1;
1331 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1335 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1336 update_offsets(&d->pb, &off, &len);
1337 if (len < 0 || len1 > len || len1 <= 0) {
1338 av_log(d->s, AV_LOG_ERROR,
1339 "Tag %x length violation new length %d bytes remaining %d\n",
1341 return AVERROR_INVALIDDATA;
1344 if (d->level++ >= MAX_LEVEL) {
1345 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1349 if (target_tag && tag != target_tag) {
1350 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1357 parse_MP4IODescrTag(d, off, len1);
1360 parse_MP4ODescrTag(d, off, len1);
1363 parse_MP4ESDescrTag(d, off, len1);
1365 case MP4DecConfigDescrTag:
1366 parse_MP4DecConfigDescrTag(d, off, len1);
1369 parse_MP4SLDescrTag(d, off, len1);
1376 avio_seek(&d->pb, off + len1, SEEK_SET);
1380 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1381 Mp4Descr *descr, int *descr_count, int max_descr_count)
1383 MP4DescrParseContext d;
1386 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1390 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1392 *descr_count = d.descr_count;
1396 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1397 Mp4Descr *descr, int *descr_count, int max_descr_count)
1399 MP4DescrParseContext d;
1402 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1406 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1408 *descr_count = d.descr_count;
1412 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1415 MpegTSContext *ts = filter->u.section_filter.opaque;
1417 const uint8_t *p, *p_end;
1419 int mp4_descr_count = 0;
1420 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1422 AVFormatContext *s = ts->stream;
1424 p_end = section + section_len - 4;
1426 if (parse_section_header(&h, &p, p_end) < 0)
1428 if (h.tid != M4OD_TID)
1431 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1432 MAX_MP4_DESCR_COUNT);
1434 for (pid = 0; pid < NB_PID_MAX; pid++) {
1437 for (i = 0; i < mp4_descr_count; i++) {
1440 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1442 if (ts->pids[pid]->type != MPEGTS_PES) {
1443 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1446 pes = ts->pids[pid]->u.pes_filter.opaque;
1451 pes->sl = mp4_descr[i].sl;
1453 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1454 mp4_descr[i].dec_config_descr_len, 0,
1455 NULL, NULL, NULL, NULL);
1456 ff_mp4_read_dec_config_descr(s, st, &pb);
1457 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1458 st->codec->extradata_size > 0)
1459 st->need_parsing = 0;
1460 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1461 st->codec->extradata_size > 0)
1462 st->need_parsing = 0;
1464 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1466 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1467 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1468 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1469 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1470 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1471 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1474 for (i = 0; i < mp4_descr_count; i++)
1475 av_free(mp4_descr[i].dec_config_descr);
1478 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1479 const uint8_t **pp, const uint8_t *desc_list_end,
1480 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1483 const uint8_t *desc_end;
1484 int desc_len, desc_tag, desc_es_id;
1488 desc_tag = get8(pp, desc_list_end);
1490 return AVERROR_INVALIDDATA;
1491 desc_len = get8(pp, desc_list_end);
1493 return AVERROR_INVALIDDATA;
1494 desc_end = *pp + desc_len;
1495 if (desc_end > desc_list_end)
1496 return AVERROR_INVALIDDATA;
1498 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1500 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1501 stream_type == STREAM_TYPE_PRIVATE_DATA)
1502 mpegts_find_stream_type(st, desc_tag, DESC_types);
1505 case 0x1E: /* SL descriptor */
1506 desc_es_id = get16(pp, desc_end);
1507 if (ts && ts->pids[pid])
1508 ts->pids[pid]->es_id = desc_es_id;
1509 for (i = 0; i < mp4_descr_count; i++)
1510 if (mp4_descr[i].dec_config_descr_len &&
1511 mp4_descr[i].es_id == desc_es_id) {
1513 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1514 mp4_descr[i].dec_config_descr_len, 0,
1515 NULL, NULL, NULL, NULL);
1516 ff_mp4_read_dec_config_descr(fc, st, &pb);
1517 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1518 st->codec->extradata_size > 0)
1519 st->need_parsing = 0;
1520 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1521 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1524 case 0x1F: /* FMC descriptor */
1525 get16(pp, desc_end);
1526 if (mp4_descr_count > 0 &&
1527 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1528 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1530 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1531 mp4_descr->dec_config_descr_len, 0,
1532 NULL, NULL, NULL, NULL);
1533 ff_mp4_read_dec_config_descr(fc, st, &pb);
1534 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1535 st->codec->extradata_size > 0) {
1536 st->request_probe = st->need_parsing = 0;
1537 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1541 case 0x56: /* DVB teletext descriptor */
1543 uint8_t *extradata = NULL;
1544 int language_count = desc_len / 5;
1546 if (desc_len > 0 && desc_len % 5 != 0)
1547 return AVERROR_INVALIDDATA;
1549 if (language_count > 0) {
1550 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1551 if (language_count > sizeof(language) / 4) {
1552 language_count = sizeof(language) / 4;
1555 if (st->codec->extradata == NULL) {
1556 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1557 return AVERROR(ENOMEM);
1561 if (st->codec->extradata_size < language_count * 2)
1562 return AVERROR_INVALIDDATA;
1564 extradata = st->codec->extradata;
1566 for (i = 0; i < language_count; i++) {
1567 language[i * 4 + 0] = get8(pp, desc_end);
1568 language[i * 4 + 1] = get8(pp, desc_end);
1569 language[i * 4 + 2] = get8(pp, desc_end);
1570 language[i * 4 + 3] = ',';
1572 memcpy(extradata, *pp, 2);
1578 language[i * 4 - 1] = 0;
1579 av_dict_set(&st->metadata, "language", language, 0);
1583 case 0x59: /* subtitling descriptor */
1585 /* 8 bytes per DVB subtitle substream data:
1586 * ISO_639_language_code (3 bytes),
1587 * subtitling_type (1 byte),
1588 * composition_page_id (2 bytes),
1589 * ancillary_page_id (2 bytes) */
1590 int language_count = desc_len / 8;
1592 if (desc_len > 0 && desc_len % 8 != 0)
1593 return AVERROR_INVALIDDATA;
1595 if (language_count > 1) {
1596 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1599 if (language_count > 0) {
1602 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1603 if (language_count > sizeof(language) / 4) {
1604 language_count = sizeof(language) / 4;
1607 if (st->codec->extradata == NULL) {
1608 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1609 return AVERROR(ENOMEM);
1613 if (st->codec->extradata_size < language_count * 5)
1614 return AVERROR_INVALIDDATA;
1616 extradata = st->codec->extradata;
1618 for (i = 0; i < language_count; i++) {
1619 language[i * 4 + 0] = get8(pp, desc_end);
1620 language[i * 4 + 1] = get8(pp, desc_end);
1621 language[i * 4 + 2] = get8(pp, desc_end);
1622 language[i * 4 + 3] = ',';
1624 /* hearing impaired subtitles detection using subtitling_type */
1626 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1627 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1628 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1629 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1630 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1631 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1632 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1636 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1637 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1643 language[i * 4 - 1] = 0;
1644 av_dict_set(&st->metadata, "language", language, 0);
1648 case 0x0a: /* ISO 639 language descriptor */
1649 for (i = 0; i + 4 <= desc_len; i += 4) {
1650 language[i + 0] = get8(pp, desc_end);
1651 language[i + 1] = get8(pp, desc_end);
1652 language[i + 2] = get8(pp, desc_end);
1653 language[i + 3] = ',';
1654 switch (get8(pp, desc_end)) {
1656 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1659 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1662 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1667 language[i - 1] = 0;
1668 av_dict_set(&st->metadata, "language", language, 0);
1671 case 0x05: /* registration descriptor */
1672 st->codec->codec_tag = bytestream_get_le32(pp);
1673 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1674 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1675 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1677 case 0x52: /* stream identifier descriptor */
1678 st->stream_identifier = 1 + get8(pp, desc_end);
1680 case 0x26: /* metadata descriptor */
1681 if (get16(pp, desc_end) == 0xFFFF)
1683 if (get8(pp, desc_end) == 0xFF) {
1684 st->codec->codec_tag = bytestream_get_le32(pp);
1685 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1686 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1696 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1698 MpegTSContext *ts = filter->u.section_filter.opaque;
1699 SectionHeader h1, *h = &h1;
1702 const uint8_t *p, *p_end, *desc_list_end;
1703 int program_info_length, pcr_pid, pid, stream_type;
1705 uint32_t prog_reg_desc = 0; /* registration descriptor */
1707 int mp4_descr_count = 0;
1708 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1711 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1712 hex_dump_debug(ts->stream, section, section_len);
1714 p_end = section + section_len - 4;
1716 if (parse_section_header(h, &p, p_end) < 0)
1719 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1720 h->id, h->sec_num, h->last_sec_num);
1722 if (h->tid != PMT_TID)
1725 clear_program(ts, h->id);
1726 pcr_pid = get16(&p, p_end);
1730 add_pid_to_pmt(ts, h->id, pcr_pid);
1731 set_pcr_pid(ts->stream, h->id, pcr_pid);
1733 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1735 program_info_length = get16(&p, p_end);
1736 if (program_info_length < 0)
1738 program_info_length &= 0xfff;
1739 while (program_info_length >= 2) {
1741 tag = get8(&p, p_end);
1742 len = get8(&p, p_end);
1744 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1746 if (len > program_info_length - 2)
1747 // something else is broken, exit the program_descriptors_loop
1749 program_info_length -= len + 2;
1750 if (tag == 0x1d) { // IOD descriptor
1751 get8(&p, p_end); // scope
1752 get8(&p, p_end); // label
1754 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1755 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1756 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1757 prog_reg_desc = bytestream_get_le32(&p);
1762 p += program_info_length;
1766 // stop parsing after pmt, we found header
1767 if (!ts->stream->nb_streams)
1770 set_pmt_found(ts, h->id);
1776 stream_type = get8(&p, p_end);
1777 if (stream_type < 0)
1779 pid = get16(&p, p_end);
1783 if (pid == ts->current_pid)
1786 /* now create stream */
1787 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1788 pes = ts->pids[pid]->u.pes_filter.opaque;
1790 pes->st = avformat_new_stream(pes->stream, NULL);
1793 pes->st->id = pes->pid;
1796 } else if (stream_type != 0x13) {
1798 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1799 pes = add_pes_stream(ts, pid, pcr_pid);
1801 st = avformat_new_stream(pes->stream, NULL);
1807 int idx = ff_find_stream_index(ts->stream, pid);
1809 st = ts->stream->streams[idx];
1811 st = avformat_new_stream(ts->stream, NULL);
1815 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1822 if (pes && !pes->stream_type)
1823 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1825 add_pid_to_pmt(ts, h->id, pid);
1827 ff_program_add_stream_index(ts->stream, h->id, st->index);
1829 desc_list_len = get16(&p, p_end);
1830 if (desc_list_len < 0)
1832 desc_list_len &= 0xfff;
1833 desc_list_end = p + desc_list_len;
1834 if (desc_list_end > p_end)
1837 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1838 desc_list_end, mp4_descr,
1839 mp4_descr_count, pid, ts) < 0)
1842 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1843 stream_type == 0x83 && pes->sub_st) {
1844 ff_program_add_stream_index(ts->stream, h->id,
1845 pes->sub_st->index);
1846 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1852 if (!ts->pids[pcr_pid])
1853 mpegts_open_pcr_filter(ts, pcr_pid);
1856 for (i = 0; i < mp4_descr_count; i++)
1857 av_free(mp4_descr[i].dec_config_descr);
1860 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1862 MpegTSContext *ts = filter->u.section_filter.opaque;
1863 SectionHeader h1, *h = &h1;
1864 const uint8_t *p, *p_end;
1868 av_dlog(ts->stream, "PAT:\n");
1869 hex_dump_debug(ts->stream, section, section_len);
1871 p_end = section + section_len - 4;
1873 if (parse_section_header(h, &p, p_end) < 0)
1875 if (h->tid != PAT_TID)
1878 ts->stream->ts_id = h->id;
1882 sid = get16(&p, p_end);
1885 pmt_pid = get16(&p, p_end);
1890 if (pmt_pid == ts->current_pid)
1893 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1895 if (sid == 0x0000) {
1898 MpegTSFilter *fil = ts->pids[pmt_pid];
1899 program = av_new_program(ts->stream, sid);
1900 program->program_num = sid;
1901 program->pmt_pid = pmt_pid;
1903 if ( fil->type != MPEGTS_SECTION
1904 || fil->pid != pmt_pid
1905 || fil->u.section_filter.section_cb != pmt_cb)
1906 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1908 if (!ts->pids[pmt_pid])
1909 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1910 add_pat_entry(ts, sid);
1911 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1912 add_pid_to_pmt(ts, sid, pmt_pid);
1918 for (j=0; j<ts->stream->nb_programs; j++) {
1919 for (i = 0; i < ts->nb_prg; i++)
1920 if (ts->prg[i].id == ts->stream->programs[j]->id)
1923 clear_avprogram(ts, ts->stream->programs[j]->id);
1928 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1930 MpegTSContext *ts = filter->u.section_filter.opaque;
1931 SectionHeader h1, *h = &h1;
1932 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1933 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1934 char *name, *provider_name;
1936 av_dlog(ts->stream, "SDT:\n");
1937 hex_dump_debug(ts->stream, section, section_len);
1939 p_end = section + section_len - 4;
1941 if (parse_section_header(h, &p, p_end) < 0)
1943 if (h->tid != SDT_TID)
1945 onid = get16(&p, p_end);
1948 val = get8(&p, p_end);
1952 sid = get16(&p, p_end);
1955 val = get8(&p, p_end);
1958 desc_list_len = get16(&p, p_end);
1959 if (desc_list_len < 0)
1961 desc_list_len &= 0xfff;
1962 desc_list_end = p + desc_list_len;
1963 if (desc_list_end > p_end)
1966 desc_tag = get8(&p, desc_list_end);
1969 desc_len = get8(&p, desc_list_end);
1970 desc_end = p + desc_len;
1971 if (desc_end > desc_list_end)
1974 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1975 desc_tag, desc_len);
1979 service_type = get8(&p, p_end);
1980 if (service_type < 0)
1982 provider_name = getstr8(&p, p_end);
1985 name = getstr8(&p, p_end);
1987 AVProgram *program = av_new_program(ts->stream, sid);
1989 av_dict_set(&program->metadata, "service_name", name, 0);
1990 av_dict_set(&program->metadata, "service_provider",
1995 av_free(provider_name);
2006 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2007 const uint8_t *packet);
2009 /* handle one TS packet */
2010 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2013 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2014 has_adaptation, has_payload;
2015 const uint8_t *p, *p_end;
2018 pid = AV_RB16(packet + 1) & 0x1fff;
2019 if (pid && discard_pid(ts, pid))
2021 is_start = packet[1] & 0x40;
2022 tss = ts->pids[pid];
2023 if (ts->auto_guess && tss == NULL && is_start) {
2024 add_pes_stream(ts, pid, -1);
2025 tss = ts->pids[pid];
2029 ts->current_pid = pid;
2031 afc = (packet[3] >> 4) & 3;
2032 if (afc == 0) /* reserved value */
2034 has_adaptation = afc & 2;
2035 has_payload = afc & 1;
2036 is_discontinuity = has_adaptation &&
2037 packet[4] != 0 && /* with length > 0 */
2038 (packet[5] & 0x80); /* and discontinuity indicated */
2040 /* continuity check (currently not used) */
2041 cc = (packet[3] & 0xf);
2042 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2043 cc_ok = pid == 0x1FFF || // null packet PID
2050 av_log(ts->stream, AV_LOG_DEBUG,
2051 "Continuity check failed for pid %d expected %d got %d\n",
2052 pid, expected_cc, cc);
2053 if (tss->type == MPEGTS_PES) {
2054 PESContext *pc = tss->u.pes_filter.opaque;
2055 pc->flags |= AV_PKT_FLAG_CORRUPT;
2059 if (!has_payload && tss->type != MPEGTS_PCR)
2062 if (has_adaptation) {
2063 /* skip adaptation field */
2066 /* if past the end of packet, ignore */
2067 p_end = packet + TS_PACKET_SIZE;
2068 if (p > p_end || (p == p_end && tss->type != MPEGTS_PCR))
2071 pos = avio_tell(ts->stream->pb);
2073 av_assert0(pos >= TS_PACKET_SIZE);
2074 ts->pos47_full = pos - TS_PACKET_SIZE;
2077 if (tss->type == MPEGTS_SECTION) {
2079 /* pointer field present */
2081 if (p + len > p_end)
2084 /* write remaining section bytes */
2085 write_section_data(ts, tss,
2087 /* check whether filter has been closed */
2093 write_section_data(ts, tss,
2098 write_section_data(ts, tss,
2103 // stop find_stream_info from waiting for more streams
2104 // when all programs have received a PMT
2105 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2107 for (i = 0; i < ts->nb_prg; i++) {
2108 if (!ts->prg[i].pmt_found)
2111 if (i == ts->nb_prg && ts->nb_prg > 0) {
2112 if (ts->stream->nb_streams > 1 || pos > 100000) {
2113 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2114 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2123 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2124 tss->last_pcr = pcr_h * 300 + pcr_l;
2125 // Note: The position here points actually behind the current packet.
2126 if (tss->type == MPEGTS_PES) {
2127 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2128 pos - ts->raw_packet_size)) < 0)
2136 static void reanalyze(MpegTSContext *ts) {
2137 AVIOContext *pb = ts->stream->pb;
2138 int64_t pos = avio_tell(pb);
2141 pos -= ts->pos47_full;
2142 if (pos == TS_PACKET_SIZE) {
2143 ts->size_stat[0] ++;
2144 } else if (pos == TS_DVHS_PACKET_SIZE) {
2145 ts->size_stat[1] ++;
2146 } else if (pos == TS_FEC_PACKET_SIZE) {
2147 ts->size_stat[2] ++;
2150 ts->size_stat_count ++;
2151 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2153 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2154 newsize = TS_PACKET_SIZE;
2155 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2156 newsize = TS_DVHS_PACKET_SIZE;
2157 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2158 newsize = TS_FEC_PACKET_SIZE;
2160 if (newsize && newsize != ts->raw_packet_size) {
2161 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2162 ts->raw_packet_size = newsize;
2164 ts->size_stat_count = 0;
2165 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2169 /* XXX: try to find a better synchro over several packets (use
2170 * get_packet_size() ?) */
2171 static int mpegts_resync(AVFormatContext *s)
2173 AVIOContext *pb = s->pb;
2176 for (i = 0; i < MAX_RESYNC_SIZE; i++) {
2181 avio_seek(pb, -1, SEEK_CUR);
2182 reanalyze(s->priv_data);
2186 av_log(s, AV_LOG_ERROR,
2187 "max resync size reached, could not find sync byte\n");
2189 return AVERROR_INVALIDDATA;
2192 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2193 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2194 const uint8_t **data)
2196 AVIOContext *pb = s->pb;
2200 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2201 if (len != TS_PACKET_SIZE)
2202 return len < 0 ? len : AVERROR_EOF;
2203 /* check packet sync byte */
2204 if ((*data)[0] != 0x47) {
2205 /* find a new packet start */
2206 uint64_t pos = avio_tell(pb);
2207 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2209 if (mpegts_resync(s) < 0)
2210 return AVERROR(EAGAIN);
2220 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2222 AVIOContext *pb = s->pb;
2223 int skip = raw_packet_size - TS_PACKET_SIZE;
2225 avio_skip(pb, skip);
2228 static int handle_packets(MpegTSContext *ts, int nb_packets)
2230 AVFormatContext *s = ts->stream;
2231 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2232 const uint8_t *data;
2233 int packet_num, ret = 0;
2235 if (avio_tell(s->pb) != ts->last_pos) {
2237 av_dlog(ts->stream, "Skipping after seek\n");
2238 /* seek detected, flush pes buffer */
2239 for (i = 0; i < NB_PID_MAX; i++) {
2241 if (ts->pids[i]->type == MPEGTS_PES) {
2242 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2243 av_buffer_unref(&pes->buffer);
2244 pes->data_index = 0;
2245 pes->state = MPEGTS_SKIP; /* skip until pes header */
2247 ts->pids[i]->last_cc = -1;
2248 ts->pids[i]->last_pcr = -1;
2255 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2258 if (nb_packets != 0 && packet_num >= nb_packets ||
2259 ts->stop_parse > 1) {
2260 ret = AVERROR(EAGAIN);
2263 if (ts->stop_parse > 0)
2266 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2269 ret = handle_packet(ts, data);
2270 finished_reading_packet(s, ts->raw_packet_size);
2274 ts->last_pos = avio_tell(s->pb);
2278 static int mpegts_probe(AVProbeData *p)
2280 const int size = p->buf_size;
2284 int check_count = size / TS_FEC_PACKET_SIZE;
2285 #define CHECK_COUNT 10
2286 #define CHECK_BLOCK 100
2288 if (check_count < CHECK_COUNT)
2289 return AVERROR_INVALIDDATA;
2291 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2292 int left = FFMIN(check_count - i, CHECK_BLOCK);
2293 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2294 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2295 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2296 score = FFMAX3(score, dvhs_score, fec_score);
2298 maxscore = FFMAX(maxscore, score);
2301 sumscore = sumscore * CHECK_COUNT / check_count;
2302 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2304 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2306 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2307 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2309 return AVERROR_INVALIDDATA;
2312 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2313 * (-1) if not available */
2314 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2316 int afc, len, flags;
2320 afc = (packet[3] >> 4) & 3;
2322 return AVERROR_INVALIDDATA;
2327 return AVERROR_INVALIDDATA;
2330 if (!(flags & 0x10))
2331 return AVERROR_INVALIDDATA;
2333 return AVERROR_INVALIDDATA;
2335 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2336 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2340 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2342 /* NOTE: We attempt to seek on non-seekable files as well, as the
2343 * probe buffer usually is big enough. Only warn if the seek failed
2344 * on files where the seek should work. */
2345 if (avio_seek(pb, pos, SEEK_SET) < 0)
2346 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2349 static int mpegts_read_header(AVFormatContext *s)
2351 MpegTSContext *ts = s->priv_data;
2352 AVIOContext *pb = s->pb;
2353 uint8_t buf[8 * 1024] = {0};
2357 ffio_ensure_seekback(pb, s->probesize);
2359 /* read the first 8192 bytes to get packet size */
2360 pos = avio_tell(pb);
2361 len = avio_read(pb, buf, sizeof(buf));
2362 ts->raw_packet_size = get_packet_size(buf, len);
2363 if (ts->raw_packet_size <= 0) {
2364 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2365 ts->raw_packet_size = TS_PACKET_SIZE;
2370 if (s->iformat == &ff_mpegts_demuxer) {
2373 /* first do a scan to get all the services */
2374 seek_back(s, pb, pos);
2376 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2378 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2380 handle_packets(ts, s->probesize / ts->raw_packet_size);
2381 /* if could not find service, enable auto_guess */
2385 av_dlog(ts->stream, "tuning done\n");
2387 s->ctx_flags |= AVFMTCTX_NOHEADER;
2390 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2391 int64_t pcrs[2], pcr_h;
2392 int packet_count[2];
2393 uint8_t packet[TS_PACKET_SIZE];
2394 const uint8_t *data;
2396 /* only read packets */
2398 st = avformat_new_stream(s, NULL);
2400 return AVERROR(ENOMEM);
2401 avpriv_set_pts_info(st, 60, 1, 27000000);
2402 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2403 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2405 /* we iterate until we find two PCRs to estimate the bitrate */
2410 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2413 pid = AV_RB16(data + 1) & 0x1fff;
2414 if ((pcr_pid == -1 || pcr_pid == pid) &&
2415 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2416 finished_reading_packet(s, ts->raw_packet_size);
2418 packet_count[nb_pcrs] = nb_packets;
2419 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2424 finished_reading_packet(s, ts->raw_packet_size);
2429 /* NOTE1: the bitrate is computed without the FEC */
2430 /* NOTE2: it is only the bitrate of the start of the stream */
2431 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2432 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2433 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2434 st->codec->bit_rate = s->bit_rate;
2435 st->start_time = ts->cur_pcr;
2436 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2437 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2440 seek_back(s, pb, pos);
2444 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2446 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2448 MpegTSContext *ts = s->priv_data;
2450 int64_t pcr_h, next_pcr_h, pos;
2451 int pcr_l, next_pcr_l;
2452 uint8_t pcr_buf[12];
2453 const uint8_t *data;
2455 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2456 return AVERROR(ENOMEM);
2457 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2458 pkt->pos = avio_tell(s->pb);
2460 av_free_packet(pkt);
2463 if (data != pkt->data)
2464 memcpy(pkt->data, data, ts->raw_packet_size);
2465 finished_reading_packet(s, ts->raw_packet_size);
2466 if (ts->mpeg2ts_compute_pcr) {
2467 /* compute exact PCR for each packet */
2468 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2469 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2470 pos = avio_tell(s->pb);
2471 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2472 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2473 avio_read(s->pb, pcr_buf, 12);
2474 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2475 /* XXX: not precise enough */
2477 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2482 avio_seek(s->pb, pos, SEEK_SET);
2483 /* no next PCR found: we use previous increment */
2484 ts->cur_pcr = pcr_h * 300 + pcr_l;
2486 pkt->pts = ts->cur_pcr;
2487 pkt->duration = ts->pcr_incr;
2488 ts->cur_pcr += ts->pcr_incr;
2490 pkt->stream_index = 0;
2494 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2496 MpegTSContext *ts = s->priv_data;
2501 ret = handle_packets(ts, 0);
2503 av_free_packet(ts->pkt);
2504 /* flush pes data left */
2505 for (i = 0; i < NB_PID_MAX; i++)
2506 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2507 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2508 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2509 new_pes_packet(pes, pkt);
2510 pes->state = MPEGTS_SKIP;
2517 if (!ret && pkt->size < 0)
2518 ret = AVERROR(EINTR);
2522 static void mpegts_free(MpegTSContext *ts)
2528 for (i = 0; i < NB_PID_MAX; i++)
2530 mpegts_close_filter(ts, ts->pids[i]);
2533 static int mpegts_read_close(AVFormatContext *s)
2535 MpegTSContext *ts = s->priv_data;
2540 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2541 int64_t *ppos, int64_t pos_limit)
2543 MpegTSContext *ts = s->priv_data;
2544 int64_t pos, timestamp;
2545 uint8_t buf[TS_PACKET_SIZE];
2546 int pcr_l, pcr_pid =
2547 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2548 int pos47 = ts->pos47_full % ts->raw_packet_size;
2550 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2551 ts->raw_packet_size + pos47;
2552 while(pos < pos_limit) {
2553 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2554 return AV_NOPTS_VALUE;
2555 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2556 return AV_NOPTS_VALUE;
2557 if (buf[0] != 0x47) {
2558 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2559 if (mpegts_resync(s) < 0)
2560 return AV_NOPTS_VALUE;
2561 pos = avio_tell(s->pb);
2564 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2565 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2569 pos += ts->raw_packet_size;
2572 return AV_NOPTS_VALUE;
2575 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2576 int64_t *ppos, int64_t pos_limit)
2578 MpegTSContext *ts = s->priv_data;
2580 int pos47 = ts->pos47_full % ts->raw_packet_size;
2581 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2582 ff_read_frame_flush(s);
2583 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2584 return AV_NOPTS_VALUE;
2585 while(pos < pos_limit) {
2588 av_init_packet(&pkt);
2589 ret = av_read_frame(s, &pkt);
2591 return AV_NOPTS_VALUE;
2592 av_free_packet(&pkt);
2593 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2594 ff_reduce_index(s, pkt.stream_index);
2595 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2596 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2604 return AV_NOPTS_VALUE;
2607 /**************************************************************/
2608 /* parsing functions - called from other demuxers such as RTP */
2610 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2614 ts = av_mallocz(sizeof(MpegTSContext));
2617 /* no stream case, currently used by RTP */
2618 ts->raw_packet_size = TS_PACKET_SIZE;
2621 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2622 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2627 /* return the consumed length if a packet was output, or -1 if no
2628 * packet is output */
2629 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2630 const uint8_t *buf, int len)
2638 if (len < TS_PACKET_SIZE)
2639 return AVERROR_INVALIDDATA;
2640 if (buf[0] != 0x47) {
2644 handle_packet(ts, buf);
2645 buf += TS_PACKET_SIZE;
2646 len -= TS_PACKET_SIZE;
2647 if (ts->stop_parse == 1)
2654 void ff_mpegts_parse_close(MpegTSContext *ts)
2660 AVInputFormat ff_mpegts_demuxer = {
2662 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2663 .priv_data_size = sizeof(MpegTSContext),
2664 .read_probe = mpegts_probe,
2665 .read_header = mpegts_read_header,
2666 .read_packet = mpegts_read_packet,
2667 .read_close = mpegts_read_close,
2668 .read_timestamp = mpegts_get_dts,
2669 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2670 .priv_class = &mpegts_class,
2673 AVInputFormat ff_mpegtsraw_demuxer = {
2674 .name = "mpegtsraw",
2675 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2676 .priv_data_size = sizeof(MpegTSContext),
2677 .read_header = mpegts_read_header,
2678 .read_packet = mpegts_raw_read_packet,
2679 .read_close = mpegts_read_close,
2680 .read_timestamp = mpegts_get_dts,
2681 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2682 .priv_class = &mpegtsraw_class,