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 */
143 /******************************************/
144 /* private mpegts data */
146 /** structure to keep track of Program->pids mapping */
150 int8_t crc_validity[NB_PID_MAX];
151 /** filters for various streams specified by PMT + for the PAT and PMT */
152 MpegTSFilter *pids[NB_PID_MAX];
156 static const AVOption mpegtsraw_options[] = {
157 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
158 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
159 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
160 { "ts_packetsize", "Output option carrying the raw packet size.",
161 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
163 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
167 static const AVClass mpegtsraw_class = {
168 .class_name = "mpegtsraw demuxer",
169 .item_name = av_default_item_name,
170 .option = mpegtsraw_options,
171 .version = LIBAVUTIL_VERSION_INT,
174 static const AVOption mpegts_options[] = {
175 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
176 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
177 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
178 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
179 {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
180 {.i64 = 0}, 0, 1, 0 },
181 {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
182 {.i64 = 0}, 0, 1, 0 },
186 static const AVClass mpegts_class = {
187 .class_name = "mpegts demuxer",
188 .item_name = av_default_item_name,
189 .option = mpegts_options,
190 .version = LIBAVUTIL_VERSION_INT,
193 /* TS stream handling */
198 MPEGTS_PESHEADER_FILL,
203 /* enough for PES header + length */
204 #define PES_START_SIZE 6
205 #define PES_HEADER_SIZE 9
206 #define MAX_PES_HEADER_SIZE (9 + 255)
208 typedef struct PESContext {
210 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
213 AVFormatContext *stream;
215 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
216 enum MpegTSState state;
217 /* used to get the format */
219 int flags; /**< copied to the AVPacket flags */
222 int extended_stream_id;
224 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
225 uint8_t header[MAX_PES_HEADER_SIZE];
230 extern AVInputFormat ff_mpegts_demuxer;
232 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
235 for (i = 0; i < ts->nb_prg; i++) {
236 if (ts->prg[i].id == programid) {
243 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
245 AVProgram *prg = NULL;
248 for (i = 0; i < ts->stream->nb_programs; i++)
249 if (ts->stream->programs[i]->id == programid) {
250 prg = ts->stream->programs[i];
255 prg->nb_stream_indexes = 0;
258 static void clear_program(MpegTSContext *ts, unsigned int programid)
262 clear_avprogram(ts, programid);
263 for (i = 0; i < ts->nb_prg; i++)
264 if (ts->prg[i].id == programid) {
265 ts->prg[i].nb_pids = 0;
266 ts->prg[i].pmt_found = 0;
270 static void clear_programs(MpegTSContext *ts)
276 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
279 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
283 p = &ts->prg[ts->nb_prg];
290 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
293 struct Program *p = get_program(ts, programid);
297 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
299 p->pids[p->nb_pids++] = pid;
302 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
304 struct Program *p = get_program(ts, programid);
311 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
314 for (i = 0; i < s->nb_programs; i++) {
315 if (s->programs[i]->id == programid) {
316 s->programs[i]->pcr_pid = pid;
323 * @brief discard_pid() decides if the pid is to be discarded according
324 * to caller's programs selection
325 * @param ts : - TS context
327 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
330 static int discard_pid(MpegTSContext *ts, unsigned int pid)
333 int used = 0, discarded = 0;
336 /* If none of the programs have .discard=AVDISCARD_ALL then there's
337 * no way we have to discard this packet */
338 for (k = 0; k < ts->stream->nb_programs; k++)
339 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
341 if (k == ts->stream->nb_programs)
344 for (i = 0; i < ts->nb_prg; i++) {
346 for (j = 0; j < p->nb_pids; j++) {
347 if (p->pids[j] != pid)
349 // is program with id p->id set to be discarded?
350 for (k = 0; k < ts->stream->nb_programs; k++) {
351 if (ts->stream->programs[k]->id == p->id) {
352 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
361 return !used && discarded;
365 * Assemble PES packets out of TS packets, and then call the "section_cb"
366 * function when they are complete.
368 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
369 const uint8_t *buf, int buf_size, int is_start)
371 MpegTSSectionFilter *tss = &tss1->u.section_filter;
375 memcpy(tss->section_buf, buf, buf_size);
376 tss->section_index = buf_size;
377 tss->section_h_size = -1;
378 tss->end_of_section_reached = 0;
380 if (tss->end_of_section_reached)
382 len = 4096 - tss->section_index;
385 memcpy(tss->section_buf + tss->section_index, buf, len);
386 tss->section_index += len;
389 /* compute section length if possible */
390 if (tss->section_h_size == -1 && tss->section_index >= 3) {
391 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
394 tss->section_h_size = len;
397 if (tss->section_h_size != -1 &&
398 tss->section_index >= tss->section_h_size) {
400 tss->end_of_section_reached = 1;
402 if (tss->check_crc) {
403 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
405 ts->crc_validity[ tss1->pid ] = 100;
406 }else if (ts->crc_validity[ tss1->pid ] > -10) {
407 ts->crc_validity[ tss1->pid ]--;
412 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
416 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
417 enum MpegTSFilterType type)
419 MpegTSFilter *filter;
421 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
423 if (pid >= NB_PID_MAX || ts->pids[pid])
425 filter = av_mallocz(sizeof(MpegTSFilter));
428 ts->pids[pid] = filter;
433 filter->last_cc = -1;
434 filter->last_pcr= -1;
439 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
441 SectionCallback *section_cb,
445 MpegTSFilter *filter;
446 MpegTSSectionFilter *sec;
448 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
450 sec = &filter->u.section_filter;
451 sec->section_cb = section_cb;
452 sec->opaque = opaque;
453 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
454 sec->check_crc = check_crc;
455 if (!sec->section_buf) {
462 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
466 MpegTSFilter *filter;
467 MpegTSPESFilter *pes;
469 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
472 pes = &filter->u.pes_filter;
473 pes->pes_cb = pes_cb;
474 pes->opaque = opaque;
478 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
480 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
483 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
488 if (filter->type == MPEGTS_SECTION)
489 av_freep(&filter->u.section_filter.section_buf);
490 else if (filter->type == MPEGTS_PES) {
491 PESContext *pes = filter->u.pes_filter.opaque;
492 av_buffer_unref(&pes->buffer);
493 /* referenced private data will be freed later in
494 * avformat_close_input */
495 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
496 av_freep(&filter->u.pes_filter.opaque);
501 ts->pids[pid] = NULL;
504 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
506 int stat[TS_MAX_PACKET_SIZE];
510 memset(stat, 0, packet_size * sizeof(*stat));
512 for (i = 0; i < size - 3; i++) {
513 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
514 int x = i % packet_size;
516 if (stat[x] > best_score) {
517 best_score = stat[x];
527 /* autodetect fec presence. Must have at least 1024 bytes */
528 static int get_packet_size(const uint8_t *buf, int size)
530 int score, fec_score, dvhs_score;
532 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
533 return AVERROR_INVALIDDATA;
535 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
536 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
537 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
538 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
539 score, dvhs_score, fec_score);
541 if (score > fec_score && score > dvhs_score)
542 return TS_PACKET_SIZE;
543 else if (dvhs_score > score && dvhs_score > fec_score)
544 return TS_DVHS_PACKET_SIZE;
545 else if (score < fec_score && dvhs_score < fec_score)
546 return TS_FEC_PACKET_SIZE;
548 return AVERROR_INVALIDDATA;
551 typedef struct SectionHeader {
556 uint8_t last_sec_num;
559 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
566 return AVERROR_INVALIDDATA;
572 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
578 if ((p + 1) >= p_end)
579 return AVERROR_INVALIDDATA;
586 /* read and allocate a DVB string preceded by its length */
587 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
594 len = get8(&p, p_end);
597 if ((p + len) > p_end)
599 str = av_malloc(len + 1);
609 static int parse_section_header(SectionHeader *h,
610 const uint8_t **pp, const uint8_t *p_end)
614 val = get8(pp, p_end);
619 val = get16(pp, p_end);
623 val = get8(pp, p_end);
626 h->version = (val >> 1) & 0x1f;
627 val = get8(pp, p_end);
631 val = get8(pp, p_end);
634 h->last_sec_num = val;
639 uint32_t stream_type;
640 enum AVMediaType codec_type;
641 enum AVCodecID codec_id;
644 static const StreamType ISO_types[] = {
645 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
646 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
647 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
648 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
649 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
650 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
651 /* Makito encoder sets stream type 0x11 for AAC,
652 * so auto-detect LOAS/LATM instead of hardcoding it. */
653 #if !CONFIG_LOAS_DEMUXER
654 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
656 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
657 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
658 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
659 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
660 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
664 static const StreamType HDMV_types[] = {
665 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
666 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
667 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
668 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
669 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
670 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
671 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
672 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
673 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
674 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
679 static const StreamType MISC_types[] = {
680 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
681 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
685 static const StreamType REGD_types[] = {
686 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
687 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
688 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
689 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
690 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
691 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
692 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
693 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
694 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
698 static const StreamType METADATA_types[] = {
699 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
700 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
704 /* descriptor present */
705 static const StreamType DESC_types[] = {
706 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
707 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
708 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
709 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
710 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
714 static void mpegts_find_stream_type(AVStream *st,
715 uint32_t stream_type,
716 const StreamType *types)
718 if (avcodec_is_open(st->codec)) {
719 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
723 for (; types->stream_type; types++)
724 if (stream_type == types->stream_type) {
725 st->codec->codec_type = types->codec_type;
726 st->codec->codec_id = types->codec_id;
727 st->request_probe = 0;
732 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
733 uint32_t stream_type, uint32_t prog_reg_desc)
735 int old_codec_type = st->codec->codec_type;
736 int old_codec_id = st->codec->codec_id;
738 if (avcodec_is_open(st->codec)) {
739 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
743 avpriv_set_pts_info(st, 33, 1, 90000);
745 st->codec->codec_type = AVMEDIA_TYPE_DATA;
746 st->codec->codec_id = AV_CODEC_ID_NONE;
747 st->need_parsing = AVSTREAM_PARSE_FULL;
749 pes->stream_type = stream_type;
751 av_log(pes->stream, AV_LOG_DEBUG,
752 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
753 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
755 st->codec->codec_tag = pes->stream_type;
757 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
758 if ((prog_reg_desc == AV_RL32("HDMV") ||
759 prog_reg_desc == AV_RL32("HDPR")) &&
760 st->codec->codec_id == AV_CODEC_ID_NONE) {
761 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
762 if (pes->stream_type == 0x83) {
763 // HDMV TrueHD streams also contain an AC3 coded version of the
764 // audio track - add a second stream for this
766 // priv_data cannot be shared between streams
767 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
769 return AVERROR(ENOMEM);
770 memcpy(sub_pes, pes, sizeof(*sub_pes));
772 sub_st = avformat_new_stream(pes->stream, NULL);
775 return AVERROR(ENOMEM);
778 sub_st->id = pes->pid;
779 avpriv_set_pts_info(sub_st, 33, 1, 90000);
780 sub_st->priv_data = sub_pes;
781 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
782 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
783 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
784 sub_pes->sub_st = pes->sub_st = sub_st;
787 if (st->codec->codec_id == AV_CODEC_ID_NONE)
788 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
789 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
790 st->codec->codec_id = old_codec_id;
791 st->codec->codec_type = old_codec_type;
797 static void reset_pes_packet_state(PESContext *pes)
799 pes->pts = AV_NOPTS_VALUE;
800 pes->dts = AV_NOPTS_VALUE;
803 av_buffer_unref(&pes->buffer);
806 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
810 pkt->buf = pes->buffer;
811 pkt->data = pes->buffer->data;
812 pkt->size = pes->data_index;
814 if (pes->total_size != MAX_PES_PAYLOAD &&
815 pes->pes_header_size + pes->data_index != pes->total_size +
817 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
818 pes->flags |= AV_PKT_FLAG_CORRUPT;
820 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
822 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
823 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
824 pkt->stream_index = pes->sub_st->index;
826 pkt->stream_index = pes->st->index;
829 /* store position of first TS packet of this PES packet */
830 pkt->pos = pes->ts_packet_pos;
831 pkt->flags = pes->flags;
834 reset_pes_packet_state(pes);
837 static uint64_t get_ts64(GetBitContext *gb, int bits)
839 if (get_bits_left(gb) < bits)
840 return AV_NOPTS_VALUE;
841 return get_bits64(gb, bits);
844 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
845 const uint8_t *buf, int buf_size)
848 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
849 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
850 int dts_flag = -1, cts_flag = -1;
851 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
853 init_get_bits(&gb, buf, buf_size * 8);
855 if (sl->use_au_start)
856 au_start_flag = get_bits1(&gb);
858 au_end_flag = get_bits1(&gb);
859 if (!sl->use_au_start && !sl->use_au_end)
860 au_start_flag = au_end_flag = 1;
862 ocr_flag = get_bits1(&gb);
864 idle_flag = get_bits1(&gb);
866 padding_flag = get_bits1(&gb);
868 padding_bits = get_bits(&gb, 3);
870 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
871 if (sl->packet_seq_num_len)
872 skip_bits_long(&gb, sl->packet_seq_num_len);
873 if (sl->degr_prior_len)
875 skip_bits(&gb, sl->degr_prior_len);
877 skip_bits_long(&gb, sl->ocr_len);
879 if (sl->use_rand_acc_pt)
881 if (sl->au_seq_num_len > 0)
882 skip_bits_long(&gb, sl->au_seq_num_len);
883 if (sl->use_timestamps) {
884 dts_flag = get_bits1(&gb);
885 cts_flag = get_bits1(&gb);
888 if (sl->inst_bitrate_len)
889 inst_bitrate_flag = get_bits1(&gb);
891 dts = get_ts64(&gb, sl->timestamp_len);
893 cts = get_ts64(&gb, sl->timestamp_len);
895 skip_bits_long(&gb, sl->au_len);
896 if (inst_bitrate_flag)
897 skip_bits_long(&gb, sl->inst_bitrate_len);
900 if (dts != AV_NOPTS_VALUE)
902 if (cts != AV_NOPTS_VALUE)
905 if (sl->timestamp_len && sl->timestamp_res)
906 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
908 return (get_bits_count(&gb) + 7) >> 3;
911 /* return non zero if a packet could be constructed */
912 static int mpegts_push_data(MpegTSFilter *filter,
913 const uint8_t *buf, int buf_size, int is_start,
916 PESContext *pes = filter->u.pes_filter.opaque;
917 MpegTSContext *ts = pes->ts;
925 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
926 new_pes_packet(pes, ts->pkt);
929 reset_pes_packet_state(pes);
931 pes->state = MPEGTS_HEADER;
932 pes->ts_packet_pos = pos;
935 while (buf_size > 0) {
936 switch (pes->state) {
938 len = PES_START_SIZE - pes->data_index;
941 memcpy(pes->header + pes->data_index, p, len);
942 pes->data_index += len;
945 if (pes->data_index == PES_START_SIZE) {
946 /* we got all the PES or section header. We can now
948 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
949 pes->header[2] == 0x01) {
950 /* it must be an mpeg2 PES stream */
951 code = pes->header[3] | 0x100;
952 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
955 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
957 pes->sub_st->discard == AVDISCARD_ALL)) ||
958 code == 0x1be) /* padding_stream */
961 /* stream not present in PMT */
963 if (ts->skip_changes)
966 pes->st = avformat_new_stream(ts->stream, NULL);
968 return AVERROR(ENOMEM);
969 pes->st->id = pes->pid;
970 mpegts_set_stream_info(pes->st, pes, 0, 0);
973 pes->total_size = AV_RB16(pes->header + 4);
974 /* NOTE: a zero total size means the PES size is
976 if (!pes->total_size)
977 pes->total_size = MAX_PES_PAYLOAD;
979 /* allocate pes buffer */
980 pes->buffer = av_buffer_alloc(pes->total_size +
981 FF_INPUT_BUFFER_PADDING_SIZE);
983 return AVERROR(ENOMEM);
985 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
986 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
987 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
988 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
989 pes->state = MPEGTS_PESHEADER;
990 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
992 "pid=%x stream_type=%x probing\n",
995 pes->st->request_probe = 1;
998 pes->state = MPEGTS_PAYLOAD;
1002 /* otherwise, it should be a table */
1005 pes->state = MPEGTS_SKIP;
1010 /**********************************************/
1011 /* PES packing parsing */
1012 case MPEGTS_PESHEADER:
1013 len = PES_HEADER_SIZE - pes->data_index;
1015 return AVERROR_INVALIDDATA;
1018 memcpy(pes->header + pes->data_index, p, len);
1019 pes->data_index += len;
1022 if (pes->data_index == PES_HEADER_SIZE) {
1023 pes->pes_header_size = pes->header[8] + 9;
1024 pes->state = MPEGTS_PESHEADER_FILL;
1027 case MPEGTS_PESHEADER_FILL:
1028 len = pes->pes_header_size - pes->data_index;
1030 return AVERROR_INVALIDDATA;
1033 memcpy(pes->header + pes->data_index, p, len);
1034 pes->data_index += len;
1037 if (pes->data_index == pes->pes_header_size) {
1039 unsigned int flags, pes_ext, skip;
1041 flags = pes->header[7];
1042 r = pes->header + 9;
1043 pes->pts = AV_NOPTS_VALUE;
1044 pes->dts = AV_NOPTS_VALUE;
1045 if ((flags & 0xc0) == 0x80) {
1046 pes->dts = pes->pts = ff_parse_pes_pts(r);
1048 } else if ((flags & 0xc0) == 0xc0) {
1049 pes->pts = ff_parse_pes_pts(r);
1051 pes->dts = ff_parse_pes_pts(r);
1054 pes->extended_stream_id = -1;
1055 if (flags & 0x01) { /* PES extension */
1057 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1058 skip = (pes_ext >> 4) & 0xb;
1061 if ((pes_ext & 0x41) == 0x01 &&
1062 (r + 2) <= (pes->header + pes->pes_header_size)) {
1063 /* PES extension 2 */
1064 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1065 pes->extended_stream_id = r[1];
1069 /* we got the full header. We parse it and get the payload */
1070 pes->state = MPEGTS_PAYLOAD;
1071 pes->data_index = 0;
1072 if (pes->stream_type == 0x12 && buf_size > 0) {
1073 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1075 pes->pes_header_size += sl_header_bytes;
1076 p += sl_header_bytes;
1077 buf_size -= sl_header_bytes;
1079 if (pes->stream_type == 0x15 && buf_size >= 5) {
1080 /* skip metadata access unit header */
1081 pes->pes_header_size += 5;
1085 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1086 AVProgram *p = NULL;
1087 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1088 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1089 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1091 AVStream *st = NULL;
1092 if (f->type == MPEGTS_PES) {
1093 PESContext *pcrpes = f->u.pes_filter.opaque;
1096 } else if (f->type == MPEGTS_PCR) {
1098 for (i = 0; i < p->nb_stream_indexes; i++) {
1099 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1100 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1104 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1105 // teletext packets do not always have correct timestamps,
1106 // the standard says they should be handled after 40.6 ms at most,
1107 // and the pcr error to this packet should be no more than 100 ms.
1108 // TODO: we should interpolate the PCR, not just use the last one
1109 int64_t pcr = f->last_pcr / 300;
1110 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1111 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1112 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1113 pes->pts = pes->dts = pcr;
1114 } else if (pes->dts > pcr + 3654 + 9000) {
1115 pes->pts = pes->dts = pcr + 3654 + 9000;
1125 case MPEGTS_PAYLOAD:
1127 if (pes->data_index > 0 &&
1128 pes->data_index + buf_size > pes->total_size) {
1129 new_pes_packet(pes, ts->pkt);
1130 pes->total_size = MAX_PES_PAYLOAD;
1131 pes->buffer = av_buffer_alloc(pes->total_size +
1132 FF_INPUT_BUFFER_PADDING_SIZE);
1134 return AVERROR(ENOMEM);
1136 } else if (pes->data_index == 0 &&
1137 buf_size > pes->total_size) {
1138 // pes packet size is < ts size packet and pes data is padded with 0xff
1139 // not sure if this is legal in ts but see issue #2392
1140 buf_size = pes->total_size;
1142 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1143 pes->data_index += buf_size;
1144 /* emit complete packets with known packet size
1145 * decreases demuxer delay for infrequent packets like subtitles from
1146 * a couple of seconds to milliseconds for properly muxed files.
1147 * total_size is the number of bytes following pes_packet_length
1148 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1149 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1150 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1152 new_pes_packet(pes, ts->pkt);
1166 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1171 /* if no pid found, then add a pid context */
1172 pes = av_mallocz(sizeof(PESContext));
1176 pes->stream = ts->stream;
1178 pes->pcr_pid = pcr_pid;
1179 pes->state = MPEGTS_SKIP;
1180 pes->pts = AV_NOPTS_VALUE;
1181 pes->dts = AV_NOPTS_VALUE;
1182 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1195 Mp4Descr *active_descr;
1197 int max_descr_count;
1199 int predefined_SLConfigDescriptor_seen;
1200 } MP4DescrParseContext;
1202 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1203 const uint8_t *buf, unsigned size,
1204 Mp4Descr *descr, int max_descr_count)
1207 if (size > (1 << 30))
1208 return AVERROR_INVALIDDATA;
1210 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1211 NULL, NULL, NULL, NULL)) < 0)
1218 d->active_descr = NULL;
1219 d->max_descr_count = max_descr_count;
1224 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1226 int64_t new_off = avio_tell(pb);
1227 (*len) -= new_off - *off;
1231 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1234 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1237 int ret = parse_mp4_descr(d, off, len, 0);
1240 update_offsets(&d->pb, &off, &len);
1245 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1247 avio_rb16(&d->pb); // ID
1253 update_offsets(&d->pb, &off, &len);
1254 return parse_mp4_descr_arr(d, off, len);
1257 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1262 id_flags = avio_rb16(&d->pb);
1263 if (!(id_flags & 0x0020)) { // URL_Flag
1264 update_offsets(&d->pb, &off, &len);
1265 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1271 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1274 if (d->descr_count >= d->max_descr_count)
1275 return AVERROR_INVALIDDATA;
1276 ff_mp4_parse_es_descr(&d->pb, &es_id);
1277 d->active_descr = d->descr + (d->descr_count++);
1279 d->active_descr->es_id = es_id;
1280 update_offsets(&d->pb, &off, &len);
1281 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1282 update_offsets(&d->pb, &off, &len);
1284 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1285 d->active_descr = NULL;
1289 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1292 Mp4Descr *descr = d->active_descr;
1294 return AVERROR_INVALIDDATA;
1295 d->active_descr->dec_config_descr = av_malloc(len);
1296 if (!descr->dec_config_descr)
1297 return AVERROR(ENOMEM);
1298 descr->dec_config_descr_len = len;
1299 avio_read(&d->pb, descr->dec_config_descr, len);
1303 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1305 Mp4Descr *descr = d->active_descr;
1308 return AVERROR_INVALIDDATA;
1310 predefined = avio_r8(&d->pb);
1313 int flags = avio_r8(&d->pb);
1314 descr->sl.use_au_start = !!(flags & 0x80);
1315 descr->sl.use_au_end = !!(flags & 0x40);
1316 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1317 descr->sl.use_padding = !!(flags & 0x08);
1318 descr->sl.use_timestamps = !!(flags & 0x04);
1319 descr->sl.use_idle = !!(flags & 0x02);
1320 descr->sl.timestamp_res = avio_rb32(&d->pb);
1322 descr->sl.timestamp_len = avio_r8(&d->pb);
1323 if (descr->sl.timestamp_len > 64) {
1324 avpriv_request_sample(NULL, "timestamp_len > 64");
1325 descr->sl.timestamp_len = 64;
1326 return AVERROR_PATCHWELCOME;
1328 descr->sl.ocr_len = avio_r8(&d->pb);
1329 descr->sl.au_len = avio_r8(&d->pb);
1330 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1331 lengths = avio_rb16(&d->pb);
1332 descr->sl.degr_prior_len = lengths >> 12;
1333 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1334 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1335 } else if (!d->predefined_SLConfigDescriptor_seen){
1336 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1337 d->predefined_SLConfigDescriptor_seen = 1;
1342 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1346 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1347 update_offsets(&d->pb, &off, &len);
1348 if (len < 0 || len1 > len || len1 <= 0) {
1349 av_log(d->s, AV_LOG_ERROR,
1350 "Tag %x length violation new length %d bytes remaining %d\n",
1352 return AVERROR_INVALIDDATA;
1355 if (d->level++ >= MAX_LEVEL) {
1356 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1360 if (target_tag && tag != target_tag) {
1361 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1368 parse_MP4IODescrTag(d, off, len1);
1371 parse_MP4ODescrTag(d, off, len1);
1374 parse_MP4ESDescrTag(d, off, len1);
1376 case MP4DecConfigDescrTag:
1377 parse_MP4DecConfigDescrTag(d, off, len1);
1380 parse_MP4SLDescrTag(d, off, len1);
1387 avio_seek(&d->pb, off + len1, SEEK_SET);
1391 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1392 Mp4Descr *descr, int *descr_count, int max_descr_count)
1394 MP4DescrParseContext d;
1397 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1401 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1403 *descr_count = d.descr_count;
1407 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1408 Mp4Descr *descr, int *descr_count, int max_descr_count)
1410 MP4DescrParseContext d;
1413 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1417 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1419 *descr_count = d.descr_count;
1423 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1426 MpegTSContext *ts = filter->u.section_filter.opaque;
1428 const uint8_t *p, *p_end;
1430 int mp4_descr_count = 0;
1431 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1433 AVFormatContext *s = ts->stream;
1435 p_end = section + section_len - 4;
1437 if (parse_section_header(&h, &p, p_end) < 0)
1439 if (h.tid != M4OD_TID)
1442 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1443 MAX_MP4_DESCR_COUNT);
1445 for (pid = 0; pid < NB_PID_MAX; pid++) {
1448 for (i = 0; i < mp4_descr_count; i++) {
1451 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1453 if (ts->pids[pid]->type != MPEGTS_PES) {
1454 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1457 pes = ts->pids[pid]->u.pes_filter.opaque;
1462 pes->sl = mp4_descr[i].sl;
1464 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1465 mp4_descr[i].dec_config_descr_len, 0,
1466 NULL, NULL, NULL, NULL);
1467 ff_mp4_read_dec_config_descr(s, st, &pb);
1468 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1469 st->codec->extradata_size > 0)
1470 st->need_parsing = 0;
1471 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1472 st->codec->extradata_size > 0)
1473 st->need_parsing = 0;
1475 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1477 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1478 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1479 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1480 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1481 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1482 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1485 for (i = 0; i < mp4_descr_count; i++)
1486 av_free(mp4_descr[i].dec_config_descr);
1489 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1490 const uint8_t **pp, const uint8_t *desc_list_end,
1491 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1494 const uint8_t *desc_end;
1495 int desc_len, desc_tag, desc_es_id;
1499 desc_tag = get8(pp, desc_list_end);
1501 return AVERROR_INVALIDDATA;
1502 desc_len = get8(pp, desc_list_end);
1504 return AVERROR_INVALIDDATA;
1505 desc_end = *pp + desc_len;
1506 if (desc_end > desc_list_end)
1507 return AVERROR_INVALIDDATA;
1509 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1511 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1512 stream_type == STREAM_TYPE_PRIVATE_DATA)
1513 mpegts_find_stream_type(st, desc_tag, DESC_types);
1516 case 0x1E: /* SL descriptor */
1517 desc_es_id = get16(pp, desc_end);
1518 if (ts && ts->pids[pid])
1519 ts->pids[pid]->es_id = desc_es_id;
1520 for (i = 0; i < mp4_descr_count; i++)
1521 if (mp4_descr[i].dec_config_descr_len &&
1522 mp4_descr[i].es_id == desc_es_id) {
1524 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1525 mp4_descr[i].dec_config_descr_len, 0,
1526 NULL, NULL, NULL, NULL);
1527 ff_mp4_read_dec_config_descr(fc, st, &pb);
1528 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1529 st->codec->extradata_size > 0)
1530 st->need_parsing = 0;
1531 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1532 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1535 case 0x1F: /* FMC descriptor */
1536 get16(pp, desc_end);
1537 if (mp4_descr_count > 0 &&
1538 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1539 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1541 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1542 mp4_descr->dec_config_descr_len, 0,
1543 NULL, NULL, NULL, NULL);
1544 ff_mp4_read_dec_config_descr(fc, st, &pb);
1545 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1546 st->codec->extradata_size > 0) {
1547 st->request_probe = st->need_parsing = 0;
1548 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1552 case 0x56: /* DVB teletext descriptor */
1554 uint8_t *extradata = NULL;
1555 int language_count = desc_len / 5;
1557 if (desc_len > 0 && desc_len % 5 != 0)
1558 return AVERROR_INVALIDDATA;
1560 if (language_count > 0) {
1561 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1562 if (language_count > sizeof(language) / 4) {
1563 language_count = sizeof(language) / 4;
1566 if (st->codec->extradata == NULL) {
1567 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1568 return AVERROR(ENOMEM);
1572 if (st->codec->extradata_size < language_count * 2)
1573 return AVERROR_INVALIDDATA;
1575 extradata = st->codec->extradata;
1577 for (i = 0; i < language_count; i++) {
1578 language[i * 4 + 0] = get8(pp, desc_end);
1579 language[i * 4 + 1] = get8(pp, desc_end);
1580 language[i * 4 + 2] = get8(pp, desc_end);
1581 language[i * 4 + 3] = ',';
1583 memcpy(extradata, *pp, 2);
1589 language[i * 4 - 1] = 0;
1590 av_dict_set(&st->metadata, "language", language, 0);
1594 case 0x59: /* subtitling descriptor */
1596 /* 8 bytes per DVB subtitle substream data:
1597 * ISO_639_language_code (3 bytes),
1598 * subtitling_type (1 byte),
1599 * composition_page_id (2 bytes),
1600 * ancillary_page_id (2 bytes) */
1601 int language_count = desc_len / 8;
1603 if (desc_len > 0 && desc_len % 8 != 0)
1604 return AVERROR_INVALIDDATA;
1606 if (language_count > 1) {
1607 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1610 if (language_count > 0) {
1613 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1614 if (language_count > sizeof(language) / 4) {
1615 language_count = sizeof(language) / 4;
1618 if (st->codec->extradata == NULL) {
1619 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1620 return AVERROR(ENOMEM);
1624 if (st->codec->extradata_size < language_count * 5)
1625 return AVERROR_INVALIDDATA;
1627 extradata = st->codec->extradata;
1629 for (i = 0; i < language_count; i++) {
1630 language[i * 4 + 0] = get8(pp, desc_end);
1631 language[i * 4 + 1] = get8(pp, desc_end);
1632 language[i * 4 + 2] = get8(pp, desc_end);
1633 language[i * 4 + 3] = ',';
1635 /* hearing impaired subtitles detection using subtitling_type */
1637 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1638 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1639 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1640 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1641 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1642 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1643 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1647 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1648 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1654 language[i * 4 - 1] = 0;
1655 av_dict_set(&st->metadata, "language", language, 0);
1659 case 0x0a: /* ISO 639 language descriptor */
1660 for (i = 0; i + 4 <= desc_len; i += 4) {
1661 language[i + 0] = get8(pp, desc_end);
1662 language[i + 1] = get8(pp, desc_end);
1663 language[i + 2] = get8(pp, desc_end);
1664 language[i + 3] = ',';
1665 switch (get8(pp, desc_end)) {
1667 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1670 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1673 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1677 if (i && language[0]) {
1678 language[i - 1] = 0;
1679 av_dict_set(&st->metadata, "language", language, 0);
1682 case 0x05: /* registration descriptor */
1683 st->codec->codec_tag = bytestream_get_le32(pp);
1684 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1685 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1686 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1688 case 0x52: /* stream identifier descriptor */
1689 st->stream_identifier = 1 + get8(pp, desc_end);
1691 case 0x26: /* metadata descriptor */
1692 if (get16(pp, desc_end) == 0xFFFF)
1694 if (get8(pp, desc_end) == 0xFF) {
1695 st->codec->codec_tag = bytestream_get_le32(pp);
1696 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1697 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1707 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1709 MpegTSContext *ts = filter->u.section_filter.opaque;
1710 SectionHeader h1, *h = &h1;
1713 const uint8_t *p, *p_end, *desc_list_end;
1714 int program_info_length, pcr_pid, pid, stream_type;
1716 uint32_t prog_reg_desc = 0; /* registration descriptor */
1718 int mp4_descr_count = 0;
1719 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1722 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1723 hex_dump_debug(ts->stream, section, section_len);
1725 p_end = section + section_len - 4;
1727 if (parse_section_header(h, &p, p_end) < 0)
1730 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1731 h->id, h->sec_num, h->last_sec_num);
1733 if (h->tid != PMT_TID)
1735 if (ts->skip_changes)
1738 clear_program(ts, h->id);
1739 pcr_pid = get16(&p, p_end);
1743 add_pid_to_pmt(ts, h->id, pcr_pid);
1744 set_pcr_pid(ts->stream, h->id, pcr_pid);
1746 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1748 program_info_length = get16(&p, p_end);
1749 if (program_info_length < 0)
1751 program_info_length &= 0xfff;
1752 while (program_info_length >= 2) {
1754 tag = get8(&p, p_end);
1755 len = get8(&p, p_end);
1757 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1759 if (len > program_info_length - 2)
1760 // something else is broken, exit the program_descriptors_loop
1762 program_info_length -= len + 2;
1763 if (tag == 0x1d) { // IOD descriptor
1764 get8(&p, p_end); // scope
1765 get8(&p, p_end); // label
1767 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1768 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1769 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1770 prog_reg_desc = bytestream_get_le32(&p);
1775 p += program_info_length;
1779 // stop parsing after pmt, we found header
1780 if (!ts->stream->nb_streams)
1783 set_pmt_found(ts, h->id);
1789 stream_type = get8(&p, p_end);
1790 if (stream_type < 0)
1792 pid = get16(&p, p_end);
1796 if (pid == ts->current_pid)
1799 /* now create stream */
1800 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1801 pes = ts->pids[pid]->u.pes_filter.opaque;
1803 pes->st = avformat_new_stream(pes->stream, NULL);
1806 pes->st->id = pes->pid;
1809 } else if (stream_type != 0x13) {
1811 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1812 pes = add_pes_stream(ts, pid, pcr_pid);
1814 st = avformat_new_stream(pes->stream, NULL);
1820 int idx = ff_find_stream_index(ts->stream, pid);
1822 st = ts->stream->streams[idx];
1824 st = avformat_new_stream(ts->stream, NULL);
1828 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1835 if (pes && !pes->stream_type)
1836 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1838 add_pid_to_pmt(ts, h->id, pid);
1840 ff_program_add_stream_index(ts->stream, h->id, st->index);
1842 desc_list_len = get16(&p, p_end);
1843 if (desc_list_len < 0)
1845 desc_list_len &= 0xfff;
1846 desc_list_end = p + desc_list_len;
1847 if (desc_list_end > p_end)
1850 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1851 desc_list_end, mp4_descr,
1852 mp4_descr_count, pid, ts) < 0)
1855 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1856 stream_type == 0x83 && pes->sub_st) {
1857 ff_program_add_stream_index(ts->stream, h->id,
1858 pes->sub_st->index);
1859 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1865 if (!ts->pids[pcr_pid])
1866 mpegts_open_pcr_filter(ts, pcr_pid);
1869 for (i = 0; i < mp4_descr_count; i++)
1870 av_free(mp4_descr[i].dec_config_descr);
1873 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1875 MpegTSContext *ts = filter->u.section_filter.opaque;
1876 SectionHeader h1, *h = &h1;
1877 const uint8_t *p, *p_end;
1881 av_dlog(ts->stream, "PAT:\n");
1882 hex_dump_debug(ts->stream, section, section_len);
1884 p_end = section + section_len - 4;
1886 if (parse_section_header(h, &p, p_end) < 0)
1888 if (h->tid != PAT_TID)
1890 if (ts->skip_changes)
1893 ts->stream->ts_id = h->id;
1897 sid = get16(&p, p_end);
1900 pmt_pid = get16(&p, p_end);
1905 if (pmt_pid == ts->current_pid)
1908 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1910 if (sid == 0x0000) {
1913 MpegTSFilter *fil = ts->pids[pmt_pid];
1914 program = av_new_program(ts->stream, sid);
1915 program->program_num = sid;
1916 program->pmt_pid = pmt_pid;
1918 if ( fil->type != MPEGTS_SECTION
1919 || fil->pid != pmt_pid
1920 || fil->u.section_filter.section_cb != pmt_cb)
1921 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1923 if (!ts->pids[pmt_pid])
1924 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1925 add_pat_entry(ts, sid);
1926 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1927 add_pid_to_pmt(ts, sid, pmt_pid);
1933 for (j=0; j<ts->stream->nb_programs; j++) {
1934 for (i = 0; i < ts->nb_prg; i++)
1935 if (ts->prg[i].id == ts->stream->programs[j]->id)
1937 if (i==ts->nb_prg && !ts->skip_clear)
1938 clear_avprogram(ts, ts->stream->programs[j]->id);
1943 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1945 MpegTSContext *ts = filter->u.section_filter.opaque;
1946 SectionHeader h1, *h = &h1;
1947 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1948 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1949 char *name, *provider_name;
1951 av_dlog(ts->stream, "SDT:\n");
1952 hex_dump_debug(ts->stream, section, section_len);
1954 p_end = section + section_len - 4;
1956 if (parse_section_header(h, &p, p_end) < 0)
1958 if (h->tid != SDT_TID)
1960 if (ts->skip_changes)
1962 onid = get16(&p, p_end);
1965 val = get8(&p, p_end);
1969 sid = get16(&p, p_end);
1972 val = get8(&p, p_end);
1975 desc_list_len = get16(&p, p_end);
1976 if (desc_list_len < 0)
1978 desc_list_len &= 0xfff;
1979 desc_list_end = p + desc_list_len;
1980 if (desc_list_end > p_end)
1983 desc_tag = get8(&p, desc_list_end);
1986 desc_len = get8(&p, desc_list_end);
1987 desc_end = p + desc_len;
1988 if (desc_end > desc_list_end)
1991 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1992 desc_tag, desc_len);
1996 service_type = get8(&p, p_end);
1997 if (service_type < 0)
1999 provider_name = getstr8(&p, p_end);
2002 name = getstr8(&p, p_end);
2004 AVProgram *program = av_new_program(ts->stream, sid);
2006 av_dict_set(&program->metadata, "service_name", name, 0);
2007 av_dict_set(&program->metadata, "service_provider",
2012 av_free(provider_name);
2023 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2024 const uint8_t *packet);
2026 /* handle one TS packet */
2027 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2030 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2031 has_adaptation, has_payload;
2032 const uint8_t *p, *p_end;
2035 pid = AV_RB16(packet + 1) & 0x1fff;
2036 if (pid && discard_pid(ts, pid))
2038 is_start = packet[1] & 0x40;
2039 tss = ts->pids[pid];
2040 if (ts->auto_guess && tss == NULL && is_start) {
2041 add_pes_stream(ts, pid, -1);
2042 tss = ts->pids[pid];
2046 ts->current_pid = pid;
2048 afc = (packet[3] >> 4) & 3;
2049 if (afc == 0) /* reserved value */
2051 has_adaptation = afc & 2;
2052 has_payload = afc & 1;
2053 is_discontinuity = has_adaptation &&
2054 packet[4] != 0 && /* with length > 0 */
2055 (packet[5] & 0x80); /* and discontinuity indicated */
2057 /* continuity check (currently not used) */
2058 cc = (packet[3] & 0xf);
2059 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2060 cc_ok = pid == 0x1FFF || // null packet PID
2067 av_log(ts->stream, AV_LOG_DEBUG,
2068 "Continuity check failed for pid %d expected %d got %d\n",
2069 pid, expected_cc, cc);
2070 if (tss->type == MPEGTS_PES) {
2071 PESContext *pc = tss->u.pes_filter.opaque;
2072 pc->flags |= AV_PKT_FLAG_CORRUPT;
2076 if (!has_payload && tss->type != MPEGTS_PCR)
2079 if (has_adaptation) {
2080 /* skip adaptation field */
2083 /* if past the end of packet, ignore */
2084 p_end = packet + TS_PACKET_SIZE;
2085 if (p > p_end || (p == p_end && tss->type != MPEGTS_PCR))
2088 pos = avio_tell(ts->stream->pb);
2090 av_assert0(pos >= TS_PACKET_SIZE);
2091 ts->pos47_full = pos - TS_PACKET_SIZE;
2094 if (tss->type == MPEGTS_SECTION) {
2096 /* pointer field present */
2098 if (p + len > p_end)
2101 /* write remaining section bytes */
2102 write_section_data(ts, tss,
2104 /* check whether filter has been closed */
2110 write_section_data(ts, tss,
2115 write_section_data(ts, tss,
2120 // stop find_stream_info from waiting for more streams
2121 // when all programs have received a PMT
2122 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2124 for (i = 0; i < ts->nb_prg; i++) {
2125 if (!ts->prg[i].pmt_found)
2128 if (i == ts->nb_prg && ts->nb_prg > 0) {
2129 if (ts->stream->nb_streams > 1 || pos > 100000) {
2130 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2131 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2140 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2141 tss->last_pcr = pcr_h * 300 + pcr_l;
2142 // Note: The position here points actually behind the current packet.
2143 if (tss->type == MPEGTS_PES) {
2144 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2145 pos - ts->raw_packet_size)) < 0)
2153 static void reanalyze(MpegTSContext *ts) {
2154 AVIOContext *pb = ts->stream->pb;
2155 int64_t pos = avio_tell(pb);
2158 pos -= ts->pos47_full;
2159 if (pos == TS_PACKET_SIZE) {
2160 ts->size_stat[0] ++;
2161 } else if (pos == TS_DVHS_PACKET_SIZE) {
2162 ts->size_stat[1] ++;
2163 } else if (pos == TS_FEC_PACKET_SIZE) {
2164 ts->size_stat[2] ++;
2167 ts->size_stat_count ++;
2168 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2170 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2171 newsize = TS_PACKET_SIZE;
2172 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2173 newsize = TS_DVHS_PACKET_SIZE;
2174 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2175 newsize = TS_FEC_PACKET_SIZE;
2177 if (newsize && newsize != ts->raw_packet_size) {
2178 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2179 ts->raw_packet_size = newsize;
2181 ts->size_stat_count = 0;
2182 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2186 /* XXX: try to find a better synchro over several packets (use
2187 * get_packet_size() ?) */
2188 static int mpegts_resync(AVFormatContext *s)
2190 AVIOContext *pb = s->pb;
2193 for (i = 0; i < MAX_RESYNC_SIZE; i++) {
2198 avio_seek(pb, -1, SEEK_CUR);
2199 reanalyze(s->priv_data);
2203 av_log(s, AV_LOG_ERROR,
2204 "max resync size reached, could not find sync byte\n");
2206 return AVERROR_INVALIDDATA;
2209 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2210 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2211 const uint8_t **data)
2213 AVIOContext *pb = s->pb;
2217 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2218 if (len != TS_PACKET_SIZE)
2219 return len < 0 ? len : AVERROR_EOF;
2220 /* check packet sync byte */
2221 if ((*data)[0] != 0x47) {
2222 /* find a new packet start */
2223 uint64_t pos = avio_tell(pb);
2224 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2226 if (mpegts_resync(s) < 0)
2227 return AVERROR(EAGAIN);
2237 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2239 AVIOContext *pb = s->pb;
2240 int skip = raw_packet_size - TS_PACKET_SIZE;
2242 avio_skip(pb, skip);
2245 static int handle_packets(MpegTSContext *ts, int nb_packets)
2247 AVFormatContext *s = ts->stream;
2248 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2249 const uint8_t *data;
2250 int packet_num, ret = 0;
2252 if (avio_tell(s->pb) != ts->last_pos) {
2254 av_dlog(ts->stream, "Skipping after seek\n");
2255 /* seek detected, flush pes buffer */
2256 for (i = 0; i < NB_PID_MAX; i++) {
2258 if (ts->pids[i]->type == MPEGTS_PES) {
2259 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2260 av_buffer_unref(&pes->buffer);
2261 pes->data_index = 0;
2262 pes->state = MPEGTS_SKIP; /* skip until pes header */
2264 ts->pids[i]->last_cc = -1;
2265 ts->pids[i]->last_pcr = -1;
2272 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2275 if (nb_packets != 0 && packet_num >= nb_packets ||
2276 ts->stop_parse > 1) {
2277 ret = AVERROR(EAGAIN);
2280 if (ts->stop_parse > 0)
2283 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2286 ret = handle_packet(ts, data);
2287 finished_reading_packet(s, ts->raw_packet_size);
2291 ts->last_pos = avio_tell(s->pb);
2295 static int mpegts_probe(AVProbeData *p)
2297 const int size = p->buf_size;
2301 int check_count = size / TS_FEC_PACKET_SIZE;
2302 #define CHECK_COUNT 10
2303 #define CHECK_BLOCK 100
2305 if (check_count < CHECK_COUNT)
2306 return AVERROR_INVALIDDATA;
2308 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2309 int left = FFMIN(check_count - i, CHECK_BLOCK);
2310 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2311 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2312 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2313 score = FFMAX3(score, dvhs_score, fec_score);
2315 maxscore = FFMAX(maxscore, score);
2318 sumscore = sumscore * CHECK_COUNT / check_count;
2319 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2321 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2323 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2324 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2326 return AVERROR_INVALIDDATA;
2329 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2330 * (-1) if not available */
2331 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2333 int afc, len, flags;
2337 afc = (packet[3] >> 4) & 3;
2339 return AVERROR_INVALIDDATA;
2344 return AVERROR_INVALIDDATA;
2347 if (!(flags & 0x10))
2348 return AVERROR_INVALIDDATA;
2350 return AVERROR_INVALIDDATA;
2352 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2353 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2357 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2359 /* NOTE: We attempt to seek on non-seekable files as well, as the
2360 * probe buffer usually is big enough. Only warn if the seek failed
2361 * on files where the seek should work. */
2362 if (avio_seek(pb, pos, SEEK_SET) < 0)
2363 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2366 static int mpegts_read_header(AVFormatContext *s)
2368 MpegTSContext *ts = s->priv_data;
2369 AVIOContext *pb = s->pb;
2370 uint8_t buf[8 * 1024] = {0};
2374 ffio_ensure_seekback(pb, s->probesize);
2376 /* read the first 8192 bytes to get packet size */
2377 pos = avio_tell(pb);
2378 len = avio_read(pb, buf, sizeof(buf));
2379 ts->raw_packet_size = get_packet_size(buf, len);
2380 if (ts->raw_packet_size <= 0) {
2381 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2382 ts->raw_packet_size = TS_PACKET_SIZE;
2387 if (s->iformat == &ff_mpegts_demuxer) {
2390 /* first do a scan to get all the services */
2391 seek_back(s, pb, pos);
2393 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2395 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2397 handle_packets(ts, s->probesize / ts->raw_packet_size);
2398 /* if could not find service, enable auto_guess */
2402 av_dlog(ts->stream, "tuning done\n");
2404 s->ctx_flags |= AVFMTCTX_NOHEADER;
2407 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2408 int64_t pcrs[2], pcr_h;
2409 int packet_count[2];
2410 uint8_t packet[TS_PACKET_SIZE];
2411 const uint8_t *data;
2413 /* only read packets */
2415 st = avformat_new_stream(s, NULL);
2417 return AVERROR(ENOMEM);
2418 avpriv_set_pts_info(st, 60, 1, 27000000);
2419 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2420 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2422 /* we iterate until we find two PCRs to estimate the bitrate */
2427 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2430 pid = AV_RB16(data + 1) & 0x1fff;
2431 if ((pcr_pid == -1 || pcr_pid == pid) &&
2432 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2433 finished_reading_packet(s, ts->raw_packet_size);
2435 packet_count[nb_pcrs] = nb_packets;
2436 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2441 finished_reading_packet(s, ts->raw_packet_size);
2446 /* NOTE1: the bitrate is computed without the FEC */
2447 /* NOTE2: it is only the bitrate of the start of the stream */
2448 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2449 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2450 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2451 st->codec->bit_rate = s->bit_rate;
2452 st->start_time = ts->cur_pcr;
2453 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2454 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2457 seek_back(s, pb, pos);
2461 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2463 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2465 MpegTSContext *ts = s->priv_data;
2467 int64_t pcr_h, next_pcr_h, pos;
2468 int pcr_l, next_pcr_l;
2469 uint8_t pcr_buf[12];
2470 const uint8_t *data;
2472 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2473 return AVERROR(ENOMEM);
2474 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2475 pkt->pos = avio_tell(s->pb);
2477 av_free_packet(pkt);
2480 if (data != pkt->data)
2481 memcpy(pkt->data, data, ts->raw_packet_size);
2482 finished_reading_packet(s, ts->raw_packet_size);
2483 if (ts->mpeg2ts_compute_pcr) {
2484 /* compute exact PCR for each packet */
2485 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2486 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2487 pos = avio_tell(s->pb);
2488 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2489 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2490 avio_read(s->pb, pcr_buf, 12);
2491 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2492 /* XXX: not precise enough */
2494 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2499 avio_seek(s->pb, pos, SEEK_SET);
2500 /* no next PCR found: we use previous increment */
2501 ts->cur_pcr = pcr_h * 300 + pcr_l;
2503 pkt->pts = ts->cur_pcr;
2504 pkt->duration = ts->pcr_incr;
2505 ts->cur_pcr += ts->pcr_incr;
2507 pkt->stream_index = 0;
2511 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2513 MpegTSContext *ts = s->priv_data;
2518 ret = handle_packets(ts, 0);
2520 av_free_packet(ts->pkt);
2521 /* flush pes data left */
2522 for (i = 0; i < NB_PID_MAX; i++)
2523 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2524 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2525 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2526 new_pes_packet(pes, pkt);
2527 pes->state = MPEGTS_SKIP;
2534 if (!ret && pkt->size < 0)
2535 ret = AVERROR(EINTR);
2539 static void mpegts_free(MpegTSContext *ts)
2545 for (i = 0; i < NB_PID_MAX; i++)
2547 mpegts_close_filter(ts, ts->pids[i]);
2550 static int mpegts_read_close(AVFormatContext *s)
2552 MpegTSContext *ts = s->priv_data;
2557 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2558 int64_t *ppos, int64_t pos_limit)
2560 MpegTSContext *ts = s->priv_data;
2561 int64_t pos, timestamp;
2562 uint8_t buf[TS_PACKET_SIZE];
2563 int pcr_l, pcr_pid =
2564 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2565 int pos47 = ts->pos47_full % ts->raw_packet_size;
2567 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2568 ts->raw_packet_size + pos47;
2569 while(pos < pos_limit) {
2570 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2571 return AV_NOPTS_VALUE;
2572 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2573 return AV_NOPTS_VALUE;
2574 if (buf[0] != 0x47) {
2575 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2576 if (mpegts_resync(s) < 0)
2577 return AV_NOPTS_VALUE;
2578 pos = avio_tell(s->pb);
2581 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2582 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2586 pos += ts->raw_packet_size;
2589 return AV_NOPTS_VALUE;
2592 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2593 int64_t *ppos, int64_t pos_limit)
2595 MpegTSContext *ts = s->priv_data;
2597 int pos47 = ts->pos47_full % ts->raw_packet_size;
2598 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2599 ff_read_frame_flush(s);
2600 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2601 return AV_NOPTS_VALUE;
2602 while(pos < pos_limit) {
2605 av_init_packet(&pkt);
2606 ret = av_read_frame(s, &pkt);
2608 return AV_NOPTS_VALUE;
2609 av_free_packet(&pkt);
2610 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2611 ff_reduce_index(s, pkt.stream_index);
2612 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2613 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2621 return AV_NOPTS_VALUE;
2624 /**************************************************************/
2625 /* parsing functions - called from other demuxers such as RTP */
2627 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2631 ts = av_mallocz(sizeof(MpegTSContext));
2634 /* no stream case, currently used by RTP */
2635 ts->raw_packet_size = TS_PACKET_SIZE;
2638 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2639 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2644 /* return the consumed length if a packet was output, or -1 if no
2645 * packet is output */
2646 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2647 const uint8_t *buf, int len)
2655 if (len < TS_PACKET_SIZE)
2656 return AVERROR_INVALIDDATA;
2657 if (buf[0] != 0x47) {
2661 handle_packet(ts, buf);
2662 buf += TS_PACKET_SIZE;
2663 len -= TS_PACKET_SIZE;
2664 if (ts->stop_parse == 1)
2671 void ff_mpegts_parse_close(MpegTSContext *ts)
2677 AVInputFormat ff_mpegts_demuxer = {
2679 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2680 .priv_data_size = sizeof(MpegTSContext),
2681 .read_probe = mpegts_probe,
2682 .read_header = mpegts_read_header,
2683 .read_packet = mpegts_read_packet,
2684 .read_close = mpegts_read_close,
2685 .read_timestamp = mpegts_get_dts,
2686 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2687 .priv_class = &mpegts_class,
2690 AVInputFormat ff_mpegtsraw_demuxer = {
2691 .name = "mpegtsraw",
2692 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2693 .priv_data_size = sizeof(MpegTSContext),
2694 .read_header = mpegts_read_header,
2695 .read_packet = mpegts_raw_read_packet,
2696 .read_close = mpegts_read_close,
2697 .read_timestamp = mpegts_get_dts,
2698 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2699 .priv_class = &mpegtsraw_class,