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 */
145 /******************************************/
146 /* private mpegts data */
148 /** structure to keep track of Program->pids mapping */
152 int8_t crc_validity[NB_PID_MAX];
153 /** filters for various streams specified by PMT + for the PAT and PMT */
154 MpegTSFilter *pids[NB_PID_MAX];
158 #define MPEGTS_OPTIONS \
159 { "resync_size", "Size limit for looking up a new syncronization.", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT, { .i64 = MAX_RESYNC_SIZE}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }
161 static const AVOption options[] = {
163 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
164 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
165 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
166 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
167 {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
168 {.i64 = 0}, 0, 1, 0 },
169 {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
170 {.i64 = 0}, 0, 1, 0 },
174 static const AVClass mpegts_class = {
175 .class_name = "mpegts demuxer",
176 .item_name = av_default_item_name,
178 .version = LIBAVUTIL_VERSION_INT,
181 static const AVOption raw_options[] = {
183 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
184 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
185 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
186 { "ts_packetsize", "Output option carrying the raw packet size.",
187 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
189 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
193 static const AVClass mpegtsraw_class = {
194 .class_name = "mpegtsraw demuxer",
195 .item_name = av_default_item_name,
196 .option = raw_options,
197 .version = LIBAVUTIL_VERSION_INT,
200 /* TS stream handling */
205 MPEGTS_PESHEADER_FILL,
210 /* enough for PES header + length */
211 #define PES_START_SIZE 6
212 #define PES_HEADER_SIZE 9
213 #define MAX_PES_HEADER_SIZE (9 + 255)
215 typedef struct PESContext {
217 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
220 AVFormatContext *stream;
222 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
223 enum MpegTSState state;
224 /* used to get the format */
226 int flags; /**< copied to the AVPacket flags */
229 int extended_stream_id;
231 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
232 uint8_t header[MAX_PES_HEADER_SIZE];
237 extern AVInputFormat ff_mpegts_demuxer;
239 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
242 for (i = 0; i < ts->nb_prg; i++) {
243 if (ts->prg[i].id == programid) {
250 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
252 AVProgram *prg = NULL;
255 for (i = 0; i < ts->stream->nb_programs; i++)
256 if (ts->stream->programs[i]->id == programid) {
257 prg = ts->stream->programs[i];
262 prg->nb_stream_indexes = 0;
265 static void clear_program(MpegTSContext *ts, unsigned int programid)
269 clear_avprogram(ts, programid);
270 for (i = 0; i < ts->nb_prg; i++)
271 if (ts->prg[i].id == programid) {
272 ts->prg[i].nb_pids = 0;
273 ts->prg[i].pmt_found = 0;
277 static void clear_programs(MpegTSContext *ts)
283 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
286 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
290 p = &ts->prg[ts->nb_prg];
297 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
300 struct Program *p = get_program(ts, programid);
304 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
306 p->pids[p->nb_pids++] = pid;
309 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
311 struct Program *p = get_program(ts, programid);
318 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
321 for (i = 0; i < s->nb_programs; i++) {
322 if (s->programs[i]->id == programid) {
323 s->programs[i]->pcr_pid = pid;
330 * @brief discard_pid() decides if the pid is to be discarded according
331 * to caller's programs selection
332 * @param ts : - TS context
334 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
337 static int discard_pid(MpegTSContext *ts, unsigned int pid)
340 int used = 0, discarded = 0;
343 /* If none of the programs have .discard=AVDISCARD_ALL then there's
344 * no way we have to discard this packet */
345 for (k = 0; k < ts->stream->nb_programs; k++)
346 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
348 if (k == ts->stream->nb_programs)
351 for (i = 0; i < ts->nb_prg; i++) {
353 for (j = 0; j < p->nb_pids; j++) {
354 if (p->pids[j] != pid)
356 // is program with id p->id set to be discarded?
357 for (k = 0; k < ts->stream->nb_programs; k++) {
358 if (ts->stream->programs[k]->id == p->id) {
359 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
368 return !used && discarded;
372 * Assemble PES packets out of TS packets, and then call the "section_cb"
373 * function when they are complete.
375 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
376 const uint8_t *buf, int buf_size, int is_start)
378 MpegTSSectionFilter *tss = &tss1->u.section_filter;
382 memcpy(tss->section_buf, buf, buf_size);
383 tss->section_index = buf_size;
384 tss->section_h_size = -1;
385 tss->end_of_section_reached = 0;
387 if (tss->end_of_section_reached)
389 len = 4096 - tss->section_index;
392 memcpy(tss->section_buf + tss->section_index, buf, len);
393 tss->section_index += len;
396 /* compute section length if possible */
397 if (tss->section_h_size == -1 && tss->section_index >= 3) {
398 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
401 tss->section_h_size = len;
404 if (tss->section_h_size != -1 &&
405 tss->section_index >= tss->section_h_size) {
407 tss->end_of_section_reached = 1;
409 if (tss->check_crc) {
410 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
412 ts->crc_validity[ tss1->pid ] = 100;
413 }else if (ts->crc_validity[ tss1->pid ] > -10) {
414 ts->crc_validity[ tss1->pid ]--;
419 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
423 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
424 enum MpegTSFilterType type)
426 MpegTSFilter *filter;
428 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
430 if (pid >= NB_PID_MAX || ts->pids[pid])
432 filter = av_mallocz(sizeof(MpegTSFilter));
435 ts->pids[pid] = filter;
440 filter->last_cc = -1;
441 filter->last_pcr= -1;
446 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
448 SectionCallback *section_cb,
452 MpegTSFilter *filter;
453 MpegTSSectionFilter *sec;
455 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
457 sec = &filter->u.section_filter;
458 sec->section_cb = section_cb;
459 sec->opaque = opaque;
460 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
461 sec->check_crc = check_crc;
462 if (!sec->section_buf) {
469 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
473 MpegTSFilter *filter;
474 MpegTSPESFilter *pes;
476 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
479 pes = &filter->u.pes_filter;
480 pes->pes_cb = pes_cb;
481 pes->opaque = opaque;
485 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
487 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
490 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
495 if (filter->type == MPEGTS_SECTION)
496 av_freep(&filter->u.section_filter.section_buf);
497 else if (filter->type == MPEGTS_PES) {
498 PESContext *pes = filter->u.pes_filter.opaque;
499 av_buffer_unref(&pes->buffer);
500 /* referenced private data will be freed later in
501 * avformat_close_input */
502 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
503 av_freep(&filter->u.pes_filter.opaque);
508 ts->pids[pid] = NULL;
511 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
513 int stat[TS_MAX_PACKET_SIZE];
518 memset(stat, 0, packet_size * sizeof(*stat));
520 for (i = 0; i < size - 3; i++) {
521 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
522 int x = i % packet_size;
524 if (stat[x] > best_score) {
525 best_score = stat[x];
528 } else if (stat[x] > best_score2) {
529 best_score2 = stat[x];
534 return best_score - best_score2;
537 /* autodetect fec presence. Must have at least 1024 bytes */
538 static int get_packet_size(const uint8_t *buf, int size)
540 int score, fec_score, dvhs_score;
542 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
543 return AVERROR_INVALIDDATA;
545 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
546 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
547 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
548 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
549 score, dvhs_score, fec_score);
551 if (score > fec_score && score > dvhs_score)
552 return TS_PACKET_SIZE;
553 else if (dvhs_score > score && dvhs_score > fec_score)
554 return TS_DVHS_PACKET_SIZE;
555 else if (score < fec_score && dvhs_score < fec_score)
556 return TS_FEC_PACKET_SIZE;
558 return AVERROR_INVALIDDATA;
561 typedef struct SectionHeader {
566 uint8_t last_sec_num;
569 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
576 return AVERROR_INVALIDDATA;
582 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
588 if ((p + 1) >= p_end)
589 return AVERROR_INVALIDDATA;
596 /* read and allocate a DVB string preceded by its length */
597 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
604 len = get8(&p, p_end);
607 if ((p + len) > p_end)
609 str = av_malloc(len + 1);
619 static int parse_section_header(SectionHeader *h,
620 const uint8_t **pp, const uint8_t *p_end)
624 val = get8(pp, p_end);
629 val = get16(pp, p_end);
633 val = get8(pp, p_end);
636 h->version = (val >> 1) & 0x1f;
637 val = get8(pp, p_end);
641 val = get8(pp, p_end);
644 h->last_sec_num = val;
649 uint32_t stream_type;
650 enum AVMediaType codec_type;
651 enum AVCodecID codec_id;
654 static const StreamType ISO_types[] = {
655 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
656 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
657 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
658 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
659 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
660 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
661 /* Makito encoder sets stream type 0x11 for AAC,
662 * so auto-detect LOAS/LATM instead of hardcoding it. */
663 #if !CONFIG_LOAS_DEMUXER
664 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
666 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
667 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
668 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
669 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
670 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
674 static const StreamType HDMV_types[] = {
675 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
676 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
677 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
678 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
679 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
680 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
681 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
682 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
683 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
684 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
689 static const StreamType MISC_types[] = {
690 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
691 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
695 static const StreamType REGD_types[] = {
696 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
697 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
698 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
699 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
700 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
701 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
702 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
703 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
704 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
708 static const StreamType METADATA_types[] = {
709 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
710 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
714 /* descriptor present */
715 static const StreamType DESC_types[] = {
716 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
717 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
718 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
719 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
720 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
724 static void mpegts_find_stream_type(AVStream *st,
725 uint32_t stream_type,
726 const StreamType *types)
728 if (avcodec_is_open(st->codec)) {
729 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
733 for (; types->stream_type; types++)
734 if (stream_type == types->stream_type) {
735 st->codec->codec_type = types->codec_type;
736 st->codec->codec_id = types->codec_id;
737 st->request_probe = 0;
742 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
743 uint32_t stream_type, uint32_t prog_reg_desc)
745 int old_codec_type = st->codec->codec_type;
746 int old_codec_id = st->codec->codec_id;
748 if (avcodec_is_open(st->codec)) {
749 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
753 avpriv_set_pts_info(st, 33, 1, 90000);
755 st->codec->codec_type = AVMEDIA_TYPE_DATA;
756 st->codec->codec_id = AV_CODEC_ID_NONE;
757 st->need_parsing = AVSTREAM_PARSE_FULL;
759 pes->stream_type = stream_type;
761 av_log(pes->stream, AV_LOG_DEBUG,
762 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
763 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
765 st->codec->codec_tag = pes->stream_type;
767 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
768 if ((prog_reg_desc == AV_RL32("HDMV") ||
769 prog_reg_desc == AV_RL32("HDPR")) &&
770 st->codec->codec_id == AV_CODEC_ID_NONE) {
771 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
772 if (pes->stream_type == 0x83) {
773 // HDMV TrueHD streams also contain an AC3 coded version of the
774 // audio track - add a second stream for this
776 // priv_data cannot be shared between streams
777 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
779 return AVERROR(ENOMEM);
780 memcpy(sub_pes, pes, sizeof(*sub_pes));
782 sub_st = avformat_new_stream(pes->stream, NULL);
785 return AVERROR(ENOMEM);
788 sub_st->id = pes->pid;
789 avpriv_set_pts_info(sub_st, 33, 1, 90000);
790 sub_st->priv_data = sub_pes;
791 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
792 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
793 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
794 sub_pes->sub_st = pes->sub_st = sub_st;
797 if (st->codec->codec_id == AV_CODEC_ID_NONE)
798 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
799 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
800 st->codec->codec_id = old_codec_id;
801 st->codec->codec_type = old_codec_type;
807 static void reset_pes_packet_state(PESContext *pes)
809 pes->pts = AV_NOPTS_VALUE;
810 pes->dts = AV_NOPTS_VALUE;
813 av_buffer_unref(&pes->buffer);
816 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
820 pkt->buf = pes->buffer;
821 pkt->data = pes->buffer->data;
822 pkt->size = pes->data_index;
824 if (pes->total_size != MAX_PES_PAYLOAD &&
825 pes->pes_header_size + pes->data_index != pes->total_size +
827 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
828 pes->flags |= AV_PKT_FLAG_CORRUPT;
830 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
832 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
833 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
834 pkt->stream_index = pes->sub_st->index;
836 pkt->stream_index = pes->st->index;
839 /* store position of first TS packet of this PES packet */
840 pkt->pos = pes->ts_packet_pos;
841 pkt->flags = pes->flags;
844 reset_pes_packet_state(pes);
847 static uint64_t get_ts64(GetBitContext *gb, int bits)
849 if (get_bits_left(gb) < bits)
850 return AV_NOPTS_VALUE;
851 return get_bits64(gb, bits);
854 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
855 const uint8_t *buf, int buf_size)
858 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
859 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
860 int dts_flag = -1, cts_flag = -1;
861 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
863 init_get_bits(&gb, buf, buf_size * 8);
865 if (sl->use_au_start)
866 au_start_flag = get_bits1(&gb);
868 au_end_flag = get_bits1(&gb);
869 if (!sl->use_au_start && !sl->use_au_end)
870 au_start_flag = au_end_flag = 1;
872 ocr_flag = get_bits1(&gb);
874 idle_flag = get_bits1(&gb);
876 padding_flag = get_bits1(&gb);
878 padding_bits = get_bits(&gb, 3);
880 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
881 if (sl->packet_seq_num_len)
882 skip_bits_long(&gb, sl->packet_seq_num_len);
883 if (sl->degr_prior_len)
885 skip_bits(&gb, sl->degr_prior_len);
887 skip_bits_long(&gb, sl->ocr_len);
889 if (sl->use_rand_acc_pt)
891 if (sl->au_seq_num_len > 0)
892 skip_bits_long(&gb, sl->au_seq_num_len);
893 if (sl->use_timestamps) {
894 dts_flag = get_bits1(&gb);
895 cts_flag = get_bits1(&gb);
898 if (sl->inst_bitrate_len)
899 inst_bitrate_flag = get_bits1(&gb);
901 dts = get_ts64(&gb, sl->timestamp_len);
903 cts = get_ts64(&gb, sl->timestamp_len);
905 skip_bits_long(&gb, sl->au_len);
906 if (inst_bitrate_flag)
907 skip_bits_long(&gb, sl->inst_bitrate_len);
910 if (dts != AV_NOPTS_VALUE)
912 if (cts != AV_NOPTS_VALUE)
915 if (sl->timestamp_len && sl->timestamp_res)
916 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
918 return (get_bits_count(&gb) + 7) >> 3;
921 /* return non zero if a packet could be constructed */
922 static int mpegts_push_data(MpegTSFilter *filter,
923 const uint8_t *buf, int buf_size, int is_start,
926 PESContext *pes = filter->u.pes_filter.opaque;
927 MpegTSContext *ts = pes->ts;
935 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
936 new_pes_packet(pes, ts->pkt);
939 reset_pes_packet_state(pes);
941 pes->state = MPEGTS_HEADER;
942 pes->ts_packet_pos = pos;
945 while (buf_size > 0) {
946 switch (pes->state) {
948 len = PES_START_SIZE - pes->data_index;
951 memcpy(pes->header + pes->data_index, p, len);
952 pes->data_index += len;
955 if (pes->data_index == PES_START_SIZE) {
956 /* we got all the PES or section header. We can now
958 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
959 pes->header[2] == 0x01) {
960 /* it must be an mpeg2 PES stream */
961 code = pes->header[3] | 0x100;
962 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
965 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
967 pes->sub_st->discard == AVDISCARD_ALL)) ||
968 code == 0x1be) /* padding_stream */
971 /* stream not present in PMT */
973 if (ts->skip_changes)
976 pes->st = avformat_new_stream(ts->stream, NULL);
978 return AVERROR(ENOMEM);
979 pes->st->id = pes->pid;
980 mpegts_set_stream_info(pes->st, pes, 0, 0);
983 pes->total_size = AV_RB16(pes->header + 4);
984 /* NOTE: a zero total size means the PES size is
986 if (!pes->total_size)
987 pes->total_size = MAX_PES_PAYLOAD;
989 /* allocate pes buffer */
990 pes->buffer = av_buffer_alloc(pes->total_size +
991 FF_INPUT_BUFFER_PADDING_SIZE);
993 return AVERROR(ENOMEM);
995 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
996 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
997 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
998 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
999 pes->state = MPEGTS_PESHEADER;
1000 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1001 av_dlog(pes->stream,
1002 "pid=%x stream_type=%x probing\n",
1005 pes->st->request_probe = 1;
1008 pes->state = MPEGTS_PAYLOAD;
1009 pes->data_index = 0;
1012 /* otherwise, it should be a table */
1015 pes->state = MPEGTS_SKIP;
1020 /**********************************************/
1021 /* PES packing parsing */
1022 case MPEGTS_PESHEADER:
1023 len = PES_HEADER_SIZE - pes->data_index;
1025 return AVERROR_INVALIDDATA;
1028 memcpy(pes->header + pes->data_index, p, len);
1029 pes->data_index += len;
1032 if (pes->data_index == PES_HEADER_SIZE) {
1033 pes->pes_header_size = pes->header[8] + 9;
1034 pes->state = MPEGTS_PESHEADER_FILL;
1037 case MPEGTS_PESHEADER_FILL:
1038 len = pes->pes_header_size - pes->data_index;
1040 return AVERROR_INVALIDDATA;
1043 memcpy(pes->header + pes->data_index, p, len);
1044 pes->data_index += len;
1047 if (pes->data_index == pes->pes_header_size) {
1049 unsigned int flags, pes_ext, skip;
1051 flags = pes->header[7];
1052 r = pes->header + 9;
1053 pes->pts = AV_NOPTS_VALUE;
1054 pes->dts = AV_NOPTS_VALUE;
1055 if ((flags & 0xc0) == 0x80) {
1056 pes->dts = pes->pts = ff_parse_pes_pts(r);
1058 } else if ((flags & 0xc0) == 0xc0) {
1059 pes->pts = ff_parse_pes_pts(r);
1061 pes->dts = ff_parse_pes_pts(r);
1064 pes->extended_stream_id = -1;
1065 if (flags & 0x01) { /* PES extension */
1067 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1068 skip = (pes_ext >> 4) & 0xb;
1071 if ((pes_ext & 0x41) == 0x01 &&
1072 (r + 2) <= (pes->header + pes->pes_header_size)) {
1073 /* PES extension 2 */
1074 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1075 pes->extended_stream_id = r[1];
1079 /* we got the full header. We parse it and get the payload */
1080 pes->state = MPEGTS_PAYLOAD;
1081 pes->data_index = 0;
1082 if (pes->stream_type == 0x12 && buf_size > 0) {
1083 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1085 pes->pes_header_size += sl_header_bytes;
1086 p += sl_header_bytes;
1087 buf_size -= sl_header_bytes;
1089 if (pes->stream_type == 0x15 && buf_size >= 5) {
1090 /* skip metadata access unit header */
1091 pes->pes_header_size += 5;
1095 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1096 AVProgram *p = NULL;
1097 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1098 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1099 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1101 AVStream *st = NULL;
1102 if (f->type == MPEGTS_PES) {
1103 PESContext *pcrpes = f->u.pes_filter.opaque;
1106 } else if (f->type == MPEGTS_PCR) {
1108 for (i = 0; i < p->nb_stream_indexes; i++) {
1109 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1110 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1114 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1115 // teletext packets do not always have correct timestamps,
1116 // the standard says they should be handled after 40.6 ms at most,
1117 // and the pcr error to this packet should be no more than 100 ms.
1118 // TODO: we should interpolate the PCR, not just use the last one
1119 int64_t pcr = f->last_pcr / 300;
1120 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1121 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1122 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1123 pes->pts = pes->dts = pcr;
1124 } else if (pes->dts > pcr + 3654 + 9000) {
1125 pes->pts = pes->dts = pcr + 3654 + 9000;
1135 case MPEGTS_PAYLOAD:
1137 if (pes->data_index > 0 &&
1138 pes->data_index + buf_size > pes->total_size) {
1139 new_pes_packet(pes, ts->pkt);
1140 pes->total_size = MAX_PES_PAYLOAD;
1141 pes->buffer = av_buffer_alloc(pes->total_size +
1142 FF_INPUT_BUFFER_PADDING_SIZE);
1144 return AVERROR(ENOMEM);
1146 } else if (pes->data_index == 0 &&
1147 buf_size > pes->total_size) {
1148 // pes packet size is < ts size packet and pes data is padded with 0xff
1149 // not sure if this is legal in ts but see issue #2392
1150 buf_size = pes->total_size;
1152 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1153 pes->data_index += buf_size;
1154 /* emit complete packets with known packet size
1155 * decreases demuxer delay for infrequent packets like subtitles from
1156 * a couple of seconds to milliseconds for properly muxed files.
1157 * total_size is the number of bytes following pes_packet_length
1158 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1159 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1160 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1162 new_pes_packet(pes, ts->pkt);
1176 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1181 /* if no pid found, then add a pid context */
1182 pes = av_mallocz(sizeof(PESContext));
1186 pes->stream = ts->stream;
1188 pes->pcr_pid = pcr_pid;
1189 pes->state = MPEGTS_SKIP;
1190 pes->pts = AV_NOPTS_VALUE;
1191 pes->dts = AV_NOPTS_VALUE;
1192 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1205 Mp4Descr *active_descr;
1207 int max_descr_count;
1209 int predefined_SLConfigDescriptor_seen;
1210 } MP4DescrParseContext;
1212 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1213 const uint8_t *buf, unsigned size,
1214 Mp4Descr *descr, int max_descr_count)
1217 if (size > (1 << 30))
1218 return AVERROR_INVALIDDATA;
1220 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1221 NULL, NULL, NULL, NULL)) < 0)
1228 d->active_descr = NULL;
1229 d->max_descr_count = max_descr_count;
1234 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1236 int64_t new_off = avio_tell(pb);
1237 (*len) -= new_off - *off;
1241 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1244 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1247 int ret = parse_mp4_descr(d, off, len, 0);
1250 update_offsets(&d->pb, &off, &len);
1255 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1257 avio_rb16(&d->pb); // ID
1263 update_offsets(&d->pb, &off, &len);
1264 return parse_mp4_descr_arr(d, off, len);
1267 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1272 id_flags = avio_rb16(&d->pb);
1273 if (!(id_flags & 0x0020)) { // URL_Flag
1274 update_offsets(&d->pb, &off, &len);
1275 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1281 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1284 if (d->descr_count >= d->max_descr_count)
1285 return AVERROR_INVALIDDATA;
1286 ff_mp4_parse_es_descr(&d->pb, &es_id);
1287 d->active_descr = d->descr + (d->descr_count++);
1289 d->active_descr->es_id = es_id;
1290 update_offsets(&d->pb, &off, &len);
1291 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1292 update_offsets(&d->pb, &off, &len);
1294 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1295 d->active_descr = NULL;
1299 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1302 Mp4Descr *descr = d->active_descr;
1304 return AVERROR_INVALIDDATA;
1305 d->active_descr->dec_config_descr = av_malloc(len);
1306 if (!descr->dec_config_descr)
1307 return AVERROR(ENOMEM);
1308 descr->dec_config_descr_len = len;
1309 avio_read(&d->pb, descr->dec_config_descr, len);
1313 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1315 Mp4Descr *descr = d->active_descr;
1318 return AVERROR_INVALIDDATA;
1320 predefined = avio_r8(&d->pb);
1323 int flags = avio_r8(&d->pb);
1324 descr->sl.use_au_start = !!(flags & 0x80);
1325 descr->sl.use_au_end = !!(flags & 0x40);
1326 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1327 descr->sl.use_padding = !!(flags & 0x08);
1328 descr->sl.use_timestamps = !!(flags & 0x04);
1329 descr->sl.use_idle = !!(flags & 0x02);
1330 descr->sl.timestamp_res = avio_rb32(&d->pb);
1332 descr->sl.timestamp_len = avio_r8(&d->pb);
1333 if (descr->sl.timestamp_len > 64) {
1334 avpriv_request_sample(NULL, "timestamp_len > 64");
1335 descr->sl.timestamp_len = 64;
1336 return AVERROR_PATCHWELCOME;
1338 descr->sl.ocr_len = avio_r8(&d->pb);
1339 descr->sl.au_len = avio_r8(&d->pb);
1340 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1341 lengths = avio_rb16(&d->pb);
1342 descr->sl.degr_prior_len = lengths >> 12;
1343 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1344 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1345 } else if (!d->predefined_SLConfigDescriptor_seen){
1346 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1347 d->predefined_SLConfigDescriptor_seen = 1;
1352 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1356 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1357 update_offsets(&d->pb, &off, &len);
1358 if (len < 0 || len1 > len || len1 <= 0) {
1359 av_log(d->s, AV_LOG_ERROR,
1360 "Tag %x length violation new length %d bytes remaining %d\n",
1362 return AVERROR_INVALIDDATA;
1365 if (d->level++ >= MAX_LEVEL) {
1366 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1370 if (target_tag && tag != target_tag) {
1371 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1378 parse_MP4IODescrTag(d, off, len1);
1381 parse_MP4ODescrTag(d, off, len1);
1384 parse_MP4ESDescrTag(d, off, len1);
1386 case MP4DecConfigDescrTag:
1387 parse_MP4DecConfigDescrTag(d, off, len1);
1390 parse_MP4SLDescrTag(d, off, len1);
1397 avio_seek(&d->pb, off + len1, SEEK_SET);
1401 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1402 Mp4Descr *descr, int *descr_count, int max_descr_count)
1404 MP4DescrParseContext d;
1407 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1411 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1413 *descr_count = d.descr_count;
1417 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1418 Mp4Descr *descr, int *descr_count, int max_descr_count)
1420 MP4DescrParseContext d;
1423 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1427 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1429 *descr_count = d.descr_count;
1433 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1436 MpegTSContext *ts = filter->u.section_filter.opaque;
1438 const uint8_t *p, *p_end;
1440 int mp4_descr_count = 0;
1441 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1443 AVFormatContext *s = ts->stream;
1445 p_end = section + section_len - 4;
1447 if (parse_section_header(&h, &p, p_end) < 0)
1449 if (h.tid != M4OD_TID)
1452 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1453 MAX_MP4_DESCR_COUNT);
1455 for (pid = 0; pid < NB_PID_MAX; pid++) {
1458 for (i = 0; i < mp4_descr_count; i++) {
1461 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1463 if (ts->pids[pid]->type != MPEGTS_PES) {
1464 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1467 pes = ts->pids[pid]->u.pes_filter.opaque;
1472 pes->sl = mp4_descr[i].sl;
1474 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1475 mp4_descr[i].dec_config_descr_len, 0,
1476 NULL, NULL, NULL, NULL);
1477 ff_mp4_read_dec_config_descr(s, st, &pb);
1478 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1479 st->codec->extradata_size > 0)
1480 st->need_parsing = 0;
1481 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1482 st->codec->extradata_size > 0)
1483 st->need_parsing = 0;
1485 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1487 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1488 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1489 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1490 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1491 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1492 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1495 for (i = 0; i < mp4_descr_count; i++)
1496 av_free(mp4_descr[i].dec_config_descr);
1499 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1500 const uint8_t **pp, const uint8_t *desc_list_end,
1501 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1504 const uint8_t *desc_end;
1505 int desc_len, desc_tag, desc_es_id;
1509 desc_tag = get8(pp, desc_list_end);
1511 return AVERROR_INVALIDDATA;
1512 desc_len = get8(pp, desc_list_end);
1514 return AVERROR_INVALIDDATA;
1515 desc_end = *pp + desc_len;
1516 if (desc_end > desc_list_end)
1517 return AVERROR_INVALIDDATA;
1519 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1521 if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1522 stream_type == STREAM_TYPE_PRIVATE_DATA)
1523 mpegts_find_stream_type(st, desc_tag, DESC_types);
1526 case 0x1E: /* SL descriptor */
1527 desc_es_id = get16(pp, desc_end);
1528 if (ts && ts->pids[pid])
1529 ts->pids[pid]->es_id = desc_es_id;
1530 for (i = 0; i < mp4_descr_count; i++)
1531 if (mp4_descr[i].dec_config_descr_len &&
1532 mp4_descr[i].es_id == desc_es_id) {
1534 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1535 mp4_descr[i].dec_config_descr_len, 0,
1536 NULL, NULL, NULL, NULL);
1537 ff_mp4_read_dec_config_descr(fc, st, &pb);
1538 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1539 st->codec->extradata_size > 0)
1540 st->need_parsing = 0;
1541 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1542 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1545 case 0x1F: /* FMC descriptor */
1546 get16(pp, desc_end);
1547 if (mp4_descr_count > 0 &&
1548 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1549 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1551 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1552 mp4_descr->dec_config_descr_len, 0,
1553 NULL, NULL, NULL, NULL);
1554 ff_mp4_read_dec_config_descr(fc, st, &pb);
1555 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1556 st->codec->extradata_size > 0) {
1557 st->request_probe = st->need_parsing = 0;
1558 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1562 case 0x56: /* DVB teletext descriptor */
1564 uint8_t *extradata = NULL;
1565 int language_count = desc_len / 5;
1567 if (desc_len > 0 && desc_len % 5 != 0)
1568 return AVERROR_INVALIDDATA;
1570 if (language_count > 0) {
1571 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1572 if (language_count > sizeof(language) / 4) {
1573 language_count = sizeof(language) / 4;
1576 if (st->codec->extradata == NULL) {
1577 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1578 return AVERROR(ENOMEM);
1582 if (st->codec->extradata_size < language_count * 2)
1583 return AVERROR_INVALIDDATA;
1585 extradata = st->codec->extradata;
1587 for (i = 0; i < language_count; i++) {
1588 language[i * 4 + 0] = get8(pp, desc_end);
1589 language[i * 4 + 1] = get8(pp, desc_end);
1590 language[i * 4 + 2] = get8(pp, desc_end);
1591 language[i * 4 + 3] = ',';
1593 memcpy(extradata, *pp, 2);
1599 language[i * 4 - 1] = 0;
1600 av_dict_set(&st->metadata, "language", language, 0);
1604 case 0x59: /* subtitling descriptor */
1606 /* 8 bytes per DVB subtitle substream data:
1607 * ISO_639_language_code (3 bytes),
1608 * subtitling_type (1 byte),
1609 * composition_page_id (2 bytes),
1610 * ancillary_page_id (2 bytes) */
1611 int language_count = desc_len / 8;
1613 if (desc_len > 0 && desc_len % 8 != 0)
1614 return AVERROR_INVALIDDATA;
1616 if (language_count > 1) {
1617 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1620 if (language_count > 0) {
1623 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1624 if (language_count > sizeof(language) / 4) {
1625 language_count = sizeof(language) / 4;
1628 if (st->codec->extradata == NULL) {
1629 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1630 return AVERROR(ENOMEM);
1634 if (st->codec->extradata_size < language_count * 5)
1635 return AVERROR_INVALIDDATA;
1637 extradata = st->codec->extradata;
1639 for (i = 0; i < language_count; i++) {
1640 language[i * 4 + 0] = get8(pp, desc_end);
1641 language[i * 4 + 1] = get8(pp, desc_end);
1642 language[i * 4 + 2] = get8(pp, desc_end);
1643 language[i * 4 + 3] = ',';
1645 /* hearing impaired subtitles detection using subtitling_type */
1647 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1648 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1649 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1650 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1651 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1652 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1653 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1657 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1658 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1664 language[i * 4 - 1] = 0;
1665 av_dict_set(&st->metadata, "language", language, 0);
1669 case 0x0a: /* ISO 639 language descriptor */
1670 for (i = 0; i + 4 <= desc_len; i += 4) {
1671 language[i + 0] = get8(pp, desc_end);
1672 language[i + 1] = get8(pp, desc_end);
1673 language[i + 2] = get8(pp, desc_end);
1674 language[i + 3] = ',';
1675 switch (get8(pp, desc_end)) {
1677 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1680 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1683 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1687 if (i && language[0]) {
1688 language[i - 1] = 0;
1689 av_dict_set(&st->metadata, "language", language, 0);
1692 case 0x05: /* registration descriptor */
1693 st->codec->codec_tag = bytestream_get_le32(pp);
1694 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1695 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1696 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1698 case 0x52: /* stream identifier descriptor */
1699 st->stream_identifier = 1 + get8(pp, desc_end);
1701 case 0x26: /* metadata descriptor */
1702 if (get16(pp, desc_end) == 0xFFFF)
1704 if (get8(pp, desc_end) == 0xFF) {
1705 st->codec->codec_tag = bytestream_get_le32(pp);
1706 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1707 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1717 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1719 MpegTSContext *ts = filter->u.section_filter.opaque;
1720 SectionHeader h1, *h = &h1;
1723 const uint8_t *p, *p_end, *desc_list_end;
1724 int program_info_length, pcr_pid, pid, stream_type;
1726 uint32_t prog_reg_desc = 0; /* registration descriptor */
1728 int mp4_descr_count = 0;
1729 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1732 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1733 hex_dump_debug(ts->stream, section, section_len);
1735 p_end = section + section_len - 4;
1737 if (parse_section_header(h, &p, p_end) < 0)
1740 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1741 h->id, h->sec_num, h->last_sec_num);
1743 if (h->tid != PMT_TID)
1745 if (ts->skip_changes)
1748 clear_program(ts, h->id);
1749 pcr_pid = get16(&p, p_end);
1753 add_pid_to_pmt(ts, h->id, pcr_pid);
1754 set_pcr_pid(ts->stream, h->id, pcr_pid);
1756 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1758 program_info_length = get16(&p, p_end);
1759 if (program_info_length < 0)
1761 program_info_length &= 0xfff;
1762 while (program_info_length >= 2) {
1764 tag = get8(&p, p_end);
1765 len = get8(&p, p_end);
1767 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1769 if (len > program_info_length - 2)
1770 // something else is broken, exit the program_descriptors_loop
1772 program_info_length -= len + 2;
1773 if (tag == 0x1d) { // IOD descriptor
1774 get8(&p, p_end); // scope
1775 get8(&p, p_end); // label
1777 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1778 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1779 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1780 prog_reg_desc = bytestream_get_le32(&p);
1785 p += program_info_length;
1789 // stop parsing after pmt, we found header
1790 if (!ts->stream->nb_streams)
1793 set_pmt_found(ts, h->id);
1799 stream_type = get8(&p, p_end);
1800 if (stream_type < 0)
1802 pid = get16(&p, p_end);
1806 if (pid == ts->current_pid)
1809 /* now create stream */
1810 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1811 pes = ts->pids[pid]->u.pes_filter.opaque;
1813 pes->st = avformat_new_stream(pes->stream, NULL);
1816 pes->st->id = pes->pid;
1819 } else if (stream_type != 0x13) {
1821 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1822 pes = add_pes_stream(ts, pid, pcr_pid);
1824 st = avformat_new_stream(pes->stream, NULL);
1830 int idx = ff_find_stream_index(ts->stream, pid);
1832 st = ts->stream->streams[idx];
1834 st = avformat_new_stream(ts->stream, NULL);
1838 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1845 if (pes && !pes->stream_type)
1846 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1848 add_pid_to_pmt(ts, h->id, pid);
1850 ff_program_add_stream_index(ts->stream, h->id, st->index);
1852 desc_list_len = get16(&p, p_end);
1853 if (desc_list_len < 0)
1855 desc_list_len &= 0xfff;
1856 desc_list_end = p + desc_list_len;
1857 if (desc_list_end > p_end)
1860 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1861 desc_list_end, mp4_descr,
1862 mp4_descr_count, pid, ts) < 0)
1865 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1866 stream_type == 0x83 && pes->sub_st) {
1867 ff_program_add_stream_index(ts->stream, h->id,
1868 pes->sub_st->index);
1869 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1875 if (!ts->pids[pcr_pid])
1876 mpegts_open_pcr_filter(ts, pcr_pid);
1879 for (i = 0; i < mp4_descr_count; i++)
1880 av_free(mp4_descr[i].dec_config_descr);
1883 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1885 MpegTSContext *ts = filter->u.section_filter.opaque;
1886 SectionHeader h1, *h = &h1;
1887 const uint8_t *p, *p_end;
1891 av_dlog(ts->stream, "PAT:\n");
1892 hex_dump_debug(ts->stream, section, section_len);
1894 p_end = section + section_len - 4;
1896 if (parse_section_header(h, &p, p_end) < 0)
1898 if (h->tid != PAT_TID)
1900 if (ts->skip_changes)
1903 ts->stream->ts_id = h->id;
1907 sid = get16(&p, p_end);
1910 pmt_pid = get16(&p, p_end);
1915 if (pmt_pid == ts->current_pid)
1918 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1920 if (sid == 0x0000) {
1923 MpegTSFilter *fil = ts->pids[pmt_pid];
1924 program = av_new_program(ts->stream, sid);
1925 program->program_num = sid;
1926 program->pmt_pid = pmt_pid;
1928 if ( fil->type != MPEGTS_SECTION
1929 || fil->pid != pmt_pid
1930 || fil->u.section_filter.section_cb != pmt_cb)
1931 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1933 if (!ts->pids[pmt_pid])
1934 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1935 add_pat_entry(ts, sid);
1936 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1937 add_pid_to_pmt(ts, sid, pmt_pid);
1943 for (j=0; j<ts->stream->nb_programs; j++) {
1944 for (i = 0; i < ts->nb_prg; i++)
1945 if (ts->prg[i].id == ts->stream->programs[j]->id)
1947 if (i==ts->nb_prg && !ts->skip_clear)
1948 clear_avprogram(ts, ts->stream->programs[j]->id);
1953 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1955 MpegTSContext *ts = filter->u.section_filter.opaque;
1956 SectionHeader h1, *h = &h1;
1957 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1958 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1959 char *name, *provider_name;
1961 av_dlog(ts->stream, "SDT:\n");
1962 hex_dump_debug(ts->stream, section, section_len);
1964 p_end = section + section_len - 4;
1966 if (parse_section_header(h, &p, p_end) < 0)
1968 if (h->tid != SDT_TID)
1970 if (ts->skip_changes)
1972 onid = get16(&p, p_end);
1975 val = get8(&p, p_end);
1979 sid = get16(&p, p_end);
1982 val = get8(&p, p_end);
1985 desc_list_len = get16(&p, p_end);
1986 if (desc_list_len < 0)
1988 desc_list_len &= 0xfff;
1989 desc_list_end = p + desc_list_len;
1990 if (desc_list_end > p_end)
1993 desc_tag = get8(&p, desc_list_end);
1996 desc_len = get8(&p, desc_list_end);
1997 desc_end = p + desc_len;
1998 if (desc_end > desc_list_end)
2001 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
2002 desc_tag, desc_len);
2006 service_type = get8(&p, p_end);
2007 if (service_type < 0)
2009 provider_name = getstr8(&p, p_end);
2012 name = getstr8(&p, p_end);
2014 AVProgram *program = av_new_program(ts->stream, sid);
2016 av_dict_set(&program->metadata, "service_name", name, 0);
2017 av_dict_set(&program->metadata, "service_provider",
2022 av_free(provider_name);
2033 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2034 const uint8_t *packet);
2036 /* handle one TS packet */
2037 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2040 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2041 has_adaptation, has_payload;
2042 const uint8_t *p, *p_end;
2045 pid = AV_RB16(packet + 1) & 0x1fff;
2046 if (pid && discard_pid(ts, pid))
2048 is_start = packet[1] & 0x40;
2049 tss = ts->pids[pid];
2050 if (ts->auto_guess && !tss && is_start) {
2051 add_pes_stream(ts, pid, -1);
2052 tss = ts->pids[pid];
2056 ts->current_pid = pid;
2058 afc = (packet[3] >> 4) & 3;
2059 if (afc == 0) /* reserved value */
2061 has_adaptation = afc & 2;
2062 has_payload = afc & 1;
2063 is_discontinuity = has_adaptation &&
2064 packet[4] != 0 && /* with length > 0 */
2065 (packet[5] & 0x80); /* and discontinuity indicated */
2067 /* continuity check (currently not used) */
2068 cc = (packet[3] & 0xf);
2069 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2070 cc_ok = pid == 0x1FFF || // null packet PID
2077 av_log(ts->stream, AV_LOG_DEBUG,
2078 "Continuity check failed for pid %d expected %d got %d\n",
2079 pid, expected_cc, cc);
2080 if (tss->type == MPEGTS_PES) {
2081 PESContext *pc = tss->u.pes_filter.opaque;
2082 pc->flags |= AV_PKT_FLAG_CORRUPT;
2087 if (has_adaptation) {
2090 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2091 tss->last_pcr = pcr_h * 300 + pcr_l;
2092 /* skip adaptation field */
2095 /* if past the end of packet, ignore */
2096 p_end = packet + TS_PACKET_SIZE;
2097 if (p >= p_end || !has_payload)
2100 pos = avio_tell(ts->stream->pb);
2102 av_assert0(pos >= TS_PACKET_SIZE);
2103 ts->pos47_full = pos - TS_PACKET_SIZE;
2106 if (tss->type == MPEGTS_SECTION) {
2108 /* pointer field present */
2110 if (p + len > p_end)
2113 /* write remaining section bytes */
2114 write_section_data(ts, tss,
2116 /* check whether filter has been closed */
2122 write_section_data(ts, tss,
2127 write_section_data(ts, tss,
2132 // stop find_stream_info from waiting for more streams
2133 // when all programs have received a PMT
2134 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2136 for (i = 0; i < ts->nb_prg; i++) {
2137 if (!ts->prg[i].pmt_found)
2140 if (i == ts->nb_prg && ts->nb_prg > 0) {
2141 if (ts->stream->nb_streams > 1 || pos > 100000) {
2142 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2143 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2150 // Note: The position here points actually behind the current packet.
2151 if (tss->type == MPEGTS_PES) {
2152 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2153 pos - ts->raw_packet_size)) < 0)
2161 static void reanalyze(MpegTSContext *ts) {
2162 AVIOContext *pb = ts->stream->pb;
2163 int64_t pos = avio_tell(pb);
2166 pos -= ts->pos47_full;
2167 if (pos == TS_PACKET_SIZE) {
2168 ts->size_stat[0] ++;
2169 } else if (pos == TS_DVHS_PACKET_SIZE) {
2170 ts->size_stat[1] ++;
2171 } else if (pos == TS_FEC_PACKET_SIZE) {
2172 ts->size_stat[2] ++;
2175 ts->size_stat_count ++;
2176 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2178 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2179 newsize = TS_PACKET_SIZE;
2180 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2181 newsize = TS_DVHS_PACKET_SIZE;
2182 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2183 newsize = TS_FEC_PACKET_SIZE;
2185 if (newsize && newsize != ts->raw_packet_size) {
2186 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2187 ts->raw_packet_size = newsize;
2189 ts->size_stat_count = 0;
2190 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2194 /* XXX: try to find a better synchro over several packets (use
2195 * get_packet_size() ?) */
2196 static int mpegts_resync(AVFormatContext *s)
2198 MpegTSContext *ts = s->priv_data;
2199 AVIOContext *pb = s->pb;
2202 for (i = 0; i < ts->resync_size; i++) {
2207 avio_seek(pb, -1, SEEK_CUR);
2208 reanalyze(s->priv_data);
2212 av_log(s, AV_LOG_ERROR,
2213 "max resync size reached, could not find sync byte\n");
2215 return AVERROR_INVALIDDATA;
2218 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2219 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2220 const uint8_t **data)
2222 AVIOContext *pb = s->pb;
2226 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2227 if (len != TS_PACKET_SIZE)
2228 return len < 0 ? len : AVERROR_EOF;
2229 /* check packet sync byte */
2230 if ((*data)[0] != 0x47) {
2231 /* find a new packet start */
2232 uint64_t pos = avio_tell(pb);
2233 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2235 if (mpegts_resync(s) < 0)
2236 return AVERROR(EAGAIN);
2246 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2248 AVIOContext *pb = s->pb;
2249 int skip = raw_packet_size - TS_PACKET_SIZE;
2251 avio_skip(pb, skip);
2254 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2256 AVFormatContext *s = ts->stream;
2257 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2258 const uint8_t *data;
2262 if (avio_tell(s->pb) != ts->last_pos) {
2264 av_dlog(ts->stream, "Skipping after seek\n");
2265 /* seek detected, flush pes buffer */
2266 for (i = 0; i < NB_PID_MAX; i++) {
2268 if (ts->pids[i]->type == MPEGTS_PES) {
2269 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2270 av_buffer_unref(&pes->buffer);
2271 pes->data_index = 0;
2272 pes->state = MPEGTS_SKIP; /* skip until pes header */
2274 ts->pids[i]->last_cc = -1;
2275 ts->pids[i]->last_pcr = -1;
2282 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2285 if (nb_packets != 0 && packet_num >= nb_packets ||
2286 ts->stop_parse > 1) {
2287 ret = AVERROR(EAGAIN);
2290 if (ts->stop_parse > 0)
2293 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2296 ret = handle_packet(ts, data);
2297 finished_reading_packet(s, ts->raw_packet_size);
2301 ts->last_pos = avio_tell(s->pb);
2305 static int mpegts_probe(AVProbeData *p)
2307 const int size = p->buf_size;
2311 int check_count = size / TS_FEC_PACKET_SIZE;
2312 #define CHECK_COUNT 10
2313 #define CHECK_BLOCK 100
2315 if (check_count < CHECK_COUNT)
2316 return AVERROR_INVALIDDATA;
2318 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2319 int left = FFMIN(check_count - i, CHECK_BLOCK);
2320 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2321 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2322 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2323 score = FFMAX3(score, dvhs_score, fec_score);
2325 maxscore = FFMAX(maxscore, score);
2328 sumscore = sumscore * CHECK_COUNT / check_count;
2329 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2331 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2333 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2334 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2336 return AVERROR_INVALIDDATA;
2339 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2340 * (-1) if not available */
2341 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2343 int afc, len, flags;
2347 afc = (packet[3] >> 4) & 3;
2349 return AVERROR_INVALIDDATA;
2354 return AVERROR_INVALIDDATA;
2357 if (!(flags & 0x10))
2358 return AVERROR_INVALIDDATA;
2360 return AVERROR_INVALIDDATA;
2362 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2363 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2367 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2369 /* NOTE: We attempt to seek on non-seekable files as well, as the
2370 * probe buffer usually is big enough. Only warn if the seek failed
2371 * on files where the seek should work. */
2372 if (avio_seek(pb, pos, SEEK_SET) < 0)
2373 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2376 static int mpegts_read_header(AVFormatContext *s)
2378 MpegTSContext *ts = s->priv_data;
2379 AVIOContext *pb = s->pb;
2380 uint8_t buf[8 * 1024] = {0};
2382 int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2384 ffio_ensure_seekback(pb, probesize);
2386 /* read the first 8192 bytes to get packet size */
2387 pos = avio_tell(pb);
2388 len = avio_read(pb, buf, sizeof(buf));
2389 ts->raw_packet_size = get_packet_size(buf, len);
2390 if (ts->raw_packet_size <= 0) {
2391 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2392 ts->raw_packet_size = TS_PACKET_SIZE;
2397 if (s->iformat == &ff_mpegts_demuxer) {
2400 /* first do a scan to get all the services */
2401 seek_back(s, pb, pos);
2403 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2405 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2407 handle_packets(ts, probesize / ts->raw_packet_size);
2408 /* if could not find service, enable auto_guess */
2412 av_dlog(ts->stream, "tuning done\n");
2414 s->ctx_flags |= AVFMTCTX_NOHEADER;
2417 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2418 int64_t pcrs[2], pcr_h;
2419 int packet_count[2];
2420 uint8_t packet[TS_PACKET_SIZE];
2421 const uint8_t *data;
2423 /* only read packets */
2425 st = avformat_new_stream(s, NULL);
2427 return AVERROR(ENOMEM);
2428 avpriv_set_pts_info(st, 60, 1, 27000000);
2429 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2430 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2432 /* we iterate until we find two PCRs to estimate the bitrate */
2437 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2440 pid = AV_RB16(data + 1) & 0x1fff;
2441 if ((pcr_pid == -1 || pcr_pid == pid) &&
2442 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2443 finished_reading_packet(s, ts->raw_packet_size);
2445 packet_count[nb_pcrs] = nb_packets;
2446 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2451 finished_reading_packet(s, ts->raw_packet_size);
2456 /* NOTE1: the bitrate is computed without the FEC */
2457 /* NOTE2: it is only the bitrate of the start of the stream */
2458 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2459 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2460 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2461 st->codec->bit_rate = s->bit_rate;
2462 st->start_time = ts->cur_pcr;
2463 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2464 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2467 seek_back(s, pb, pos);
2471 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2473 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2475 MpegTSContext *ts = s->priv_data;
2477 int64_t pcr_h, next_pcr_h, pos;
2478 int pcr_l, next_pcr_l;
2479 uint8_t pcr_buf[12];
2480 const uint8_t *data;
2482 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2483 return AVERROR(ENOMEM);
2484 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2485 pkt->pos = avio_tell(s->pb);
2487 av_free_packet(pkt);
2490 if (data != pkt->data)
2491 memcpy(pkt->data, data, ts->raw_packet_size);
2492 finished_reading_packet(s, ts->raw_packet_size);
2493 if (ts->mpeg2ts_compute_pcr) {
2494 /* compute exact PCR for each packet */
2495 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2496 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2497 pos = avio_tell(s->pb);
2498 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2499 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2500 avio_read(s->pb, pcr_buf, 12);
2501 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2502 /* XXX: not precise enough */
2504 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2509 avio_seek(s->pb, pos, SEEK_SET);
2510 /* no next PCR found: we use previous increment */
2511 ts->cur_pcr = pcr_h * 300 + pcr_l;
2513 pkt->pts = ts->cur_pcr;
2514 pkt->duration = ts->pcr_incr;
2515 ts->cur_pcr += ts->pcr_incr;
2517 pkt->stream_index = 0;
2521 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2523 MpegTSContext *ts = s->priv_data;
2528 ret = handle_packets(ts, 0);
2530 av_free_packet(ts->pkt);
2531 /* flush pes data left */
2532 for (i = 0; i < NB_PID_MAX; i++)
2533 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2534 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2535 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2536 new_pes_packet(pes, pkt);
2537 pes->state = MPEGTS_SKIP;
2544 if (!ret && pkt->size < 0)
2545 ret = AVERROR(EINTR);
2549 static void mpegts_free(MpegTSContext *ts)
2555 for (i = 0; i < NB_PID_MAX; i++)
2557 mpegts_close_filter(ts, ts->pids[i]);
2560 static int mpegts_read_close(AVFormatContext *s)
2562 MpegTSContext *ts = s->priv_data;
2567 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2568 int64_t *ppos, int64_t pos_limit)
2570 MpegTSContext *ts = s->priv_data;
2571 int64_t pos, timestamp;
2572 uint8_t buf[TS_PACKET_SIZE];
2573 int pcr_l, pcr_pid =
2574 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2575 int pos47 = ts->pos47_full % ts->raw_packet_size;
2577 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2578 ts->raw_packet_size + pos47;
2579 while(pos < pos_limit) {
2580 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2581 return AV_NOPTS_VALUE;
2582 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2583 return AV_NOPTS_VALUE;
2584 if (buf[0] != 0x47) {
2585 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2586 if (mpegts_resync(s) < 0)
2587 return AV_NOPTS_VALUE;
2588 pos = avio_tell(s->pb);
2591 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2592 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2596 pos += ts->raw_packet_size;
2599 return AV_NOPTS_VALUE;
2602 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2603 int64_t *ppos, int64_t pos_limit)
2605 MpegTSContext *ts = s->priv_data;
2607 int pos47 = ts->pos47_full % ts->raw_packet_size;
2608 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2609 ff_read_frame_flush(s);
2610 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2611 return AV_NOPTS_VALUE;
2612 while(pos < pos_limit) {
2615 av_init_packet(&pkt);
2616 ret = av_read_frame(s, &pkt);
2618 return AV_NOPTS_VALUE;
2619 av_free_packet(&pkt);
2620 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2621 ff_reduce_index(s, pkt.stream_index);
2622 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2623 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2631 return AV_NOPTS_VALUE;
2634 /**************************************************************/
2635 /* parsing functions - called from other demuxers such as RTP */
2637 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
2641 ts = av_mallocz(sizeof(MpegTSContext));
2644 /* no stream case, currently used by RTP */
2645 ts->raw_packet_size = TS_PACKET_SIZE;
2648 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2649 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2654 /* return the consumed length if a packet was output, or -1 if no
2655 * packet is output */
2656 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2657 const uint8_t *buf, int len)
2665 if (len < TS_PACKET_SIZE)
2666 return AVERROR_INVALIDDATA;
2667 if (buf[0] != 0x47) {
2671 handle_packet(ts, buf);
2672 buf += TS_PACKET_SIZE;
2673 len -= TS_PACKET_SIZE;
2674 if (ts->stop_parse == 1)
2681 void avpriv_mpegts_parse_close(MpegTSContext *ts)
2687 AVInputFormat ff_mpegts_demuxer = {
2689 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2690 .priv_data_size = sizeof(MpegTSContext),
2691 .read_probe = mpegts_probe,
2692 .read_header = mpegts_read_header,
2693 .read_packet = mpegts_read_packet,
2694 .read_close = mpegts_read_close,
2695 .read_timestamp = mpegts_get_dts,
2696 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2697 .priv_class = &mpegts_class,
2700 AVInputFormat ff_mpegtsraw_demuxer = {
2701 .name = "mpegtsraw",
2702 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2703 .priv_data_size = sizeof(MpegTSContext),
2704 .read_header = mpegts_read_header,
2705 .read_packet = mpegts_raw_read_packet,
2706 .read_close = mpegts_read_close,
2707 .read_timestamp = mpegts_get_dts,
2708 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2709 .priv_class = &mpegtsraw_class,