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 synchronization.", 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;
525 if (stat[x] > best_score) {
526 best_score = stat[x];
533 return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
536 /* autodetect fec presence. Must have at least 1024 bytes */
537 static int get_packet_size(const uint8_t *buf, int size)
539 int score, fec_score, dvhs_score;
541 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
542 return AVERROR_INVALIDDATA;
544 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
545 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
546 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
547 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
548 score, dvhs_score, fec_score);
550 if (score > fec_score && score > dvhs_score)
551 return TS_PACKET_SIZE;
552 else if (dvhs_score > score && dvhs_score > fec_score)
553 return TS_DVHS_PACKET_SIZE;
554 else if (score < fec_score && dvhs_score < fec_score)
555 return TS_FEC_PACKET_SIZE;
557 return AVERROR_INVALIDDATA;
560 typedef struct SectionHeader {
565 uint8_t last_sec_num;
568 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
575 return AVERROR_INVALIDDATA;
581 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
587 if ((p + 1) >= p_end)
588 return AVERROR_INVALIDDATA;
595 /* read and allocate a DVB string preceded by its length */
596 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
603 len = get8(&p, p_end);
606 if ((p + len) > p_end)
608 str = av_malloc(len + 1);
618 static int parse_section_header(SectionHeader *h,
619 const uint8_t **pp, const uint8_t *p_end)
623 val = get8(pp, p_end);
628 val = get16(pp, p_end);
632 val = get8(pp, p_end);
635 h->version = (val >> 1) & 0x1f;
636 val = get8(pp, p_end);
640 val = get8(pp, p_end);
643 h->last_sec_num = val;
648 uint32_t stream_type;
649 enum AVMediaType codec_type;
650 enum AVCodecID codec_id;
653 static const StreamType ISO_types[] = {
654 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
655 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
656 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
657 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
658 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
659 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
660 /* Makito encoder sets stream type 0x11 for AAC,
661 * so auto-detect LOAS/LATM instead of hardcoding it. */
662 #if !CONFIG_LOAS_DEMUXER
663 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
665 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
666 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
667 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
668 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
669 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
673 static const StreamType HDMV_types[] = {
674 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
675 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
676 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
677 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
678 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
679 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
680 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
681 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
682 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
683 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
688 static const StreamType MISC_types[] = {
689 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
690 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
694 static const StreamType REGD_types[] = {
695 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
696 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
697 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
698 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
699 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
700 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
701 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
702 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
703 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
707 static const StreamType METADATA_types[] = {
708 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
709 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
713 /* descriptor present */
714 static const StreamType DESC_types[] = {
715 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
716 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
717 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
718 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
719 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
723 static void mpegts_find_stream_type(AVStream *st,
724 uint32_t stream_type,
725 const StreamType *types)
727 if (avcodec_is_open(st->codec)) {
728 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
732 for (; types->stream_type; types++)
733 if (stream_type == types->stream_type) {
734 st->codec->codec_type = types->codec_type;
735 st->codec->codec_id = types->codec_id;
736 st->request_probe = 0;
741 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
742 uint32_t stream_type, uint32_t prog_reg_desc)
744 int old_codec_type = st->codec->codec_type;
745 int old_codec_id = st->codec->codec_id;
747 if (avcodec_is_open(st->codec)) {
748 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
752 avpriv_set_pts_info(st, 33, 1, 90000);
754 st->codec->codec_type = AVMEDIA_TYPE_DATA;
755 st->codec->codec_id = AV_CODEC_ID_NONE;
756 st->need_parsing = AVSTREAM_PARSE_FULL;
758 pes->stream_type = stream_type;
760 av_log(pes->stream, AV_LOG_DEBUG,
761 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
762 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
764 st->codec->codec_tag = pes->stream_type;
766 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
767 if ((prog_reg_desc == AV_RL32("HDMV") ||
768 prog_reg_desc == AV_RL32("HDPR")) &&
769 st->codec->codec_id == AV_CODEC_ID_NONE) {
770 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
771 if (pes->stream_type == 0x83) {
772 // HDMV TrueHD streams also contain an AC3 coded version of the
773 // audio track - add a second stream for this
775 // priv_data cannot be shared between streams
776 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
778 return AVERROR(ENOMEM);
779 memcpy(sub_pes, pes, sizeof(*sub_pes));
781 sub_st = avformat_new_stream(pes->stream, NULL);
784 return AVERROR(ENOMEM);
787 sub_st->id = pes->pid;
788 avpriv_set_pts_info(sub_st, 33, 1, 90000);
789 sub_st->priv_data = sub_pes;
790 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
791 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
792 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
793 sub_pes->sub_st = pes->sub_st = sub_st;
796 if (st->codec->codec_id == AV_CODEC_ID_NONE)
797 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
798 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
799 st->codec->codec_id = old_codec_id;
800 st->codec->codec_type = old_codec_type;
806 static void reset_pes_packet_state(PESContext *pes)
808 pes->pts = AV_NOPTS_VALUE;
809 pes->dts = AV_NOPTS_VALUE;
812 av_buffer_unref(&pes->buffer);
815 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
819 pkt->buf = pes->buffer;
820 pkt->data = pes->buffer->data;
821 pkt->size = pes->data_index;
823 if (pes->total_size != MAX_PES_PAYLOAD &&
824 pes->pes_header_size + pes->data_index != pes->total_size +
826 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
827 pes->flags |= AV_PKT_FLAG_CORRUPT;
829 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
831 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
832 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
833 pkt->stream_index = pes->sub_st->index;
835 pkt->stream_index = pes->st->index;
838 /* store position of first TS packet of this PES packet */
839 pkt->pos = pes->ts_packet_pos;
840 pkt->flags = pes->flags;
843 reset_pes_packet_state(pes);
846 static uint64_t get_ts64(GetBitContext *gb, int bits)
848 if (get_bits_left(gb) < bits)
849 return AV_NOPTS_VALUE;
850 return get_bits64(gb, bits);
853 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
854 const uint8_t *buf, int buf_size)
857 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
858 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
859 int dts_flag = -1, cts_flag = -1;
860 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
862 init_get_bits(&gb, buf, buf_size * 8);
864 if (sl->use_au_start)
865 au_start_flag = get_bits1(&gb);
867 au_end_flag = get_bits1(&gb);
868 if (!sl->use_au_start && !sl->use_au_end)
869 au_start_flag = au_end_flag = 1;
871 ocr_flag = get_bits1(&gb);
873 idle_flag = get_bits1(&gb);
875 padding_flag = get_bits1(&gb);
877 padding_bits = get_bits(&gb, 3);
879 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
880 if (sl->packet_seq_num_len)
881 skip_bits_long(&gb, sl->packet_seq_num_len);
882 if (sl->degr_prior_len)
884 skip_bits(&gb, sl->degr_prior_len);
886 skip_bits_long(&gb, sl->ocr_len);
888 if (sl->use_rand_acc_pt)
890 if (sl->au_seq_num_len > 0)
891 skip_bits_long(&gb, sl->au_seq_num_len);
892 if (sl->use_timestamps) {
893 dts_flag = get_bits1(&gb);
894 cts_flag = get_bits1(&gb);
897 if (sl->inst_bitrate_len)
898 inst_bitrate_flag = get_bits1(&gb);
900 dts = get_ts64(&gb, sl->timestamp_len);
902 cts = get_ts64(&gb, sl->timestamp_len);
904 skip_bits_long(&gb, sl->au_len);
905 if (inst_bitrate_flag)
906 skip_bits_long(&gb, sl->inst_bitrate_len);
909 if (dts != AV_NOPTS_VALUE)
911 if (cts != AV_NOPTS_VALUE)
914 if (sl->timestamp_len && sl->timestamp_res)
915 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
917 return (get_bits_count(&gb) + 7) >> 3;
920 /* return non zero if a packet could be constructed */
921 static int mpegts_push_data(MpegTSFilter *filter,
922 const uint8_t *buf, int buf_size, int is_start,
925 PESContext *pes = filter->u.pes_filter.opaque;
926 MpegTSContext *ts = pes->ts;
934 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
935 new_pes_packet(pes, ts->pkt);
938 reset_pes_packet_state(pes);
940 pes->state = MPEGTS_HEADER;
941 pes->ts_packet_pos = pos;
944 while (buf_size > 0) {
945 switch (pes->state) {
947 len = PES_START_SIZE - pes->data_index;
950 memcpy(pes->header + pes->data_index, p, len);
951 pes->data_index += len;
954 if (pes->data_index == PES_START_SIZE) {
955 /* we got all the PES or section header. We can now
957 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
958 pes->header[2] == 0x01) {
959 /* it must be an mpeg2 PES stream */
960 code = pes->header[3] | 0x100;
961 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
964 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
966 pes->sub_st->discard == AVDISCARD_ALL)) ||
967 code == 0x1be) /* padding_stream */
970 /* stream not present in PMT */
972 if (ts->skip_changes)
975 pes->st = avformat_new_stream(ts->stream, NULL);
977 return AVERROR(ENOMEM);
978 pes->st->id = pes->pid;
979 mpegts_set_stream_info(pes->st, pes, 0, 0);
982 pes->total_size = AV_RB16(pes->header + 4);
983 /* NOTE: a zero total size means the PES size is
985 if (!pes->total_size)
986 pes->total_size = MAX_PES_PAYLOAD;
988 /* allocate pes buffer */
989 pes->buffer = av_buffer_alloc(pes->total_size +
990 FF_INPUT_BUFFER_PADDING_SIZE);
992 return AVERROR(ENOMEM);
994 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
995 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
996 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
997 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
998 pes->state = MPEGTS_PESHEADER;
999 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1000 av_dlog(pes->stream,
1001 "pid=%x stream_type=%x probing\n",
1004 pes->st->request_probe = 1;
1007 pes->state = MPEGTS_PAYLOAD;
1008 pes->data_index = 0;
1011 /* otherwise, it should be a table */
1014 pes->state = MPEGTS_SKIP;
1019 /**********************************************/
1020 /* PES packing parsing */
1021 case MPEGTS_PESHEADER:
1022 len = PES_HEADER_SIZE - pes->data_index;
1024 return AVERROR_INVALIDDATA;
1027 memcpy(pes->header + pes->data_index, p, len);
1028 pes->data_index += len;
1031 if (pes->data_index == PES_HEADER_SIZE) {
1032 pes->pes_header_size = pes->header[8] + 9;
1033 pes->state = MPEGTS_PESHEADER_FILL;
1036 case MPEGTS_PESHEADER_FILL:
1037 len = pes->pes_header_size - pes->data_index;
1039 return AVERROR_INVALIDDATA;
1042 memcpy(pes->header + pes->data_index, p, len);
1043 pes->data_index += len;
1046 if (pes->data_index == pes->pes_header_size) {
1048 unsigned int flags, pes_ext, skip;
1050 flags = pes->header[7];
1051 r = pes->header + 9;
1052 pes->pts = AV_NOPTS_VALUE;
1053 pes->dts = AV_NOPTS_VALUE;
1054 if ((flags & 0xc0) == 0x80) {
1055 pes->dts = pes->pts = ff_parse_pes_pts(r);
1057 } else if ((flags & 0xc0) == 0xc0) {
1058 pes->pts = ff_parse_pes_pts(r);
1060 pes->dts = ff_parse_pes_pts(r);
1063 pes->extended_stream_id = -1;
1064 if (flags & 0x01) { /* PES extension */
1066 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1067 skip = (pes_ext >> 4) & 0xb;
1070 if ((pes_ext & 0x41) == 0x01 &&
1071 (r + 2) <= (pes->header + pes->pes_header_size)) {
1072 /* PES extension 2 */
1073 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1074 pes->extended_stream_id = r[1];
1078 /* we got the full header. We parse it and get the payload */
1079 pes->state = MPEGTS_PAYLOAD;
1080 pes->data_index = 0;
1081 if (pes->stream_type == 0x12 && buf_size > 0) {
1082 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1084 pes->pes_header_size += sl_header_bytes;
1085 p += sl_header_bytes;
1086 buf_size -= sl_header_bytes;
1088 if (pes->stream_type == 0x15 && buf_size >= 5) {
1089 /* skip metadata access unit header */
1090 pes->pes_header_size += 5;
1094 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1095 AVProgram *p = NULL;
1096 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1097 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1098 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1100 AVStream *st = NULL;
1101 if (f->type == MPEGTS_PES) {
1102 PESContext *pcrpes = f->u.pes_filter.opaque;
1105 } else if (f->type == MPEGTS_PCR) {
1107 for (i = 0; i < p->nb_stream_indexes; i++) {
1108 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1109 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1113 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1114 // teletext packets do not always have correct timestamps,
1115 // the standard says they should be handled after 40.6 ms at most,
1116 // and the pcr error to this packet should be no more than 100 ms.
1117 // TODO: we should interpolate the PCR, not just use the last one
1118 int64_t pcr = f->last_pcr / 300;
1119 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1120 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1121 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1122 pes->pts = pes->dts = pcr;
1123 } else if (pes->dts > pcr + 3654 + 9000) {
1124 pes->pts = pes->dts = pcr + 3654 + 9000;
1134 case MPEGTS_PAYLOAD:
1136 if (pes->data_index > 0 &&
1137 pes->data_index + buf_size > pes->total_size) {
1138 new_pes_packet(pes, ts->pkt);
1139 pes->total_size = MAX_PES_PAYLOAD;
1140 pes->buffer = av_buffer_alloc(pes->total_size +
1141 FF_INPUT_BUFFER_PADDING_SIZE);
1143 return AVERROR(ENOMEM);
1145 } else if (pes->data_index == 0 &&
1146 buf_size > pes->total_size) {
1147 // pes packet size is < ts size packet and pes data is padded with 0xff
1148 // not sure if this is legal in ts but see issue #2392
1149 buf_size = pes->total_size;
1151 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1152 pes->data_index += buf_size;
1153 /* emit complete packets with known packet size
1154 * decreases demuxer delay for infrequent packets like subtitles from
1155 * a couple of seconds to milliseconds for properly muxed files.
1156 * total_size is the number of bytes following pes_packet_length
1157 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1158 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1159 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1161 new_pes_packet(pes, ts->pkt);
1175 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1180 /* if no pid found, then add a pid context */
1181 pes = av_mallocz(sizeof(PESContext));
1185 pes->stream = ts->stream;
1187 pes->pcr_pid = pcr_pid;
1188 pes->state = MPEGTS_SKIP;
1189 pes->pts = AV_NOPTS_VALUE;
1190 pes->dts = AV_NOPTS_VALUE;
1191 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1204 Mp4Descr *active_descr;
1206 int max_descr_count;
1208 int predefined_SLConfigDescriptor_seen;
1209 } MP4DescrParseContext;
1211 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1212 const uint8_t *buf, unsigned size,
1213 Mp4Descr *descr, int max_descr_count)
1216 if (size > (1 << 30))
1217 return AVERROR_INVALIDDATA;
1219 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1220 NULL, NULL, NULL, NULL)) < 0)
1227 d->active_descr = NULL;
1228 d->max_descr_count = max_descr_count;
1233 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1235 int64_t new_off = avio_tell(pb);
1236 (*len) -= new_off - *off;
1240 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1243 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1246 int ret = parse_mp4_descr(d, off, len, 0);
1249 update_offsets(&d->pb, &off, &len);
1254 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1256 avio_rb16(&d->pb); // ID
1262 update_offsets(&d->pb, &off, &len);
1263 return parse_mp4_descr_arr(d, off, len);
1266 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1271 id_flags = avio_rb16(&d->pb);
1272 if (!(id_flags & 0x0020)) { // URL_Flag
1273 update_offsets(&d->pb, &off, &len);
1274 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1280 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1283 if (d->descr_count >= d->max_descr_count)
1284 return AVERROR_INVALIDDATA;
1285 ff_mp4_parse_es_descr(&d->pb, &es_id);
1286 d->active_descr = d->descr + (d->descr_count++);
1288 d->active_descr->es_id = es_id;
1289 update_offsets(&d->pb, &off, &len);
1290 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1291 update_offsets(&d->pb, &off, &len);
1293 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1294 d->active_descr = NULL;
1298 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1301 Mp4Descr *descr = d->active_descr;
1303 return AVERROR_INVALIDDATA;
1304 d->active_descr->dec_config_descr = av_malloc(len);
1305 if (!descr->dec_config_descr)
1306 return AVERROR(ENOMEM);
1307 descr->dec_config_descr_len = len;
1308 avio_read(&d->pb, descr->dec_config_descr, len);
1312 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1314 Mp4Descr *descr = d->active_descr;
1317 return AVERROR_INVALIDDATA;
1319 predefined = avio_r8(&d->pb);
1322 int flags = avio_r8(&d->pb);
1323 descr->sl.use_au_start = !!(flags & 0x80);
1324 descr->sl.use_au_end = !!(flags & 0x40);
1325 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1326 descr->sl.use_padding = !!(flags & 0x08);
1327 descr->sl.use_timestamps = !!(flags & 0x04);
1328 descr->sl.use_idle = !!(flags & 0x02);
1329 descr->sl.timestamp_res = avio_rb32(&d->pb);
1331 descr->sl.timestamp_len = avio_r8(&d->pb);
1332 if (descr->sl.timestamp_len > 64) {
1333 avpriv_request_sample(NULL, "timestamp_len > 64");
1334 descr->sl.timestamp_len = 64;
1335 return AVERROR_PATCHWELCOME;
1337 descr->sl.ocr_len = avio_r8(&d->pb);
1338 descr->sl.au_len = avio_r8(&d->pb);
1339 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1340 lengths = avio_rb16(&d->pb);
1341 descr->sl.degr_prior_len = lengths >> 12;
1342 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1343 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1344 } else if (!d->predefined_SLConfigDescriptor_seen){
1345 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1346 d->predefined_SLConfigDescriptor_seen = 1;
1351 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1355 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1356 update_offsets(&d->pb, &off, &len);
1357 if (len < 0 || len1 > len || len1 <= 0) {
1358 av_log(d->s, AV_LOG_ERROR,
1359 "Tag %x length violation new length %d bytes remaining %d\n",
1361 return AVERROR_INVALIDDATA;
1364 if (d->level++ >= MAX_LEVEL) {
1365 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1369 if (target_tag && tag != target_tag) {
1370 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1377 parse_MP4IODescrTag(d, off, len1);
1380 parse_MP4ODescrTag(d, off, len1);
1383 parse_MP4ESDescrTag(d, off, len1);
1385 case MP4DecConfigDescrTag:
1386 parse_MP4DecConfigDescrTag(d, off, len1);
1389 parse_MP4SLDescrTag(d, off, len1);
1396 avio_seek(&d->pb, off + len1, SEEK_SET);
1400 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1401 Mp4Descr *descr, int *descr_count, int max_descr_count)
1403 MP4DescrParseContext d;
1406 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1410 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1412 *descr_count = d.descr_count;
1416 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1417 Mp4Descr *descr, int *descr_count, int max_descr_count)
1419 MP4DescrParseContext d;
1422 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1426 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1428 *descr_count = d.descr_count;
1432 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1435 MpegTSContext *ts = filter->u.section_filter.opaque;
1437 const uint8_t *p, *p_end;
1439 int mp4_descr_count = 0;
1440 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1442 AVFormatContext *s = ts->stream;
1444 p_end = section + section_len - 4;
1446 if (parse_section_header(&h, &p, p_end) < 0)
1448 if (h.tid != M4OD_TID)
1451 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1452 MAX_MP4_DESCR_COUNT);
1454 for (pid = 0; pid < NB_PID_MAX; pid++) {
1457 for (i = 0; i < mp4_descr_count; i++) {
1460 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1462 if (ts->pids[pid]->type != MPEGTS_PES) {
1463 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1466 pes = ts->pids[pid]->u.pes_filter.opaque;
1471 pes->sl = mp4_descr[i].sl;
1473 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1474 mp4_descr[i].dec_config_descr_len, 0,
1475 NULL, NULL, NULL, NULL);
1476 ff_mp4_read_dec_config_descr(s, st, &pb);
1477 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1478 st->codec->extradata_size > 0)
1479 st->need_parsing = 0;
1480 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1481 st->codec->extradata_size > 0)
1482 st->need_parsing = 0;
1484 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1486 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1487 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1488 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1489 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1490 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1491 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1494 for (i = 0; i < mp4_descr_count; i++)
1495 av_free(mp4_descr[i].dec_config_descr);
1498 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1499 const uint8_t **pp, const uint8_t *desc_list_end,
1500 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1503 const uint8_t *desc_end;
1504 int desc_len, desc_tag, desc_es_id;
1508 desc_tag = get8(pp, desc_list_end);
1510 return AVERROR_INVALIDDATA;
1511 desc_len = get8(pp, desc_list_end);
1513 return AVERROR_INVALIDDATA;
1514 desc_end = *pp + desc_len;
1515 if (desc_end > desc_list_end)
1516 return AVERROR_INVALIDDATA;
1518 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1520 if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1521 stream_type == STREAM_TYPE_PRIVATE_DATA)
1522 mpegts_find_stream_type(st, desc_tag, DESC_types);
1525 case 0x1E: /* SL descriptor */
1526 desc_es_id = get16(pp, desc_end);
1527 if (ts && ts->pids[pid])
1528 ts->pids[pid]->es_id = desc_es_id;
1529 for (i = 0; i < mp4_descr_count; i++)
1530 if (mp4_descr[i].dec_config_descr_len &&
1531 mp4_descr[i].es_id == desc_es_id) {
1533 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1534 mp4_descr[i].dec_config_descr_len, 0,
1535 NULL, NULL, NULL, NULL);
1536 ff_mp4_read_dec_config_descr(fc, st, &pb);
1537 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1538 st->codec->extradata_size > 0)
1539 st->need_parsing = 0;
1540 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1541 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1544 case 0x1F: /* FMC descriptor */
1545 get16(pp, desc_end);
1546 if (mp4_descr_count > 0 &&
1547 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1548 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1550 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1551 mp4_descr->dec_config_descr_len, 0,
1552 NULL, NULL, NULL, NULL);
1553 ff_mp4_read_dec_config_descr(fc, st, &pb);
1554 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1555 st->codec->extradata_size > 0) {
1556 st->request_probe = st->need_parsing = 0;
1557 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1561 case 0x56: /* DVB teletext descriptor */
1563 uint8_t *extradata = NULL;
1564 int language_count = desc_len / 5;
1566 if (desc_len > 0 && desc_len % 5 != 0)
1567 return AVERROR_INVALIDDATA;
1569 if (language_count > 0) {
1570 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1571 if (language_count > sizeof(language) / 4) {
1572 language_count = sizeof(language) / 4;
1575 if (st->codec->extradata == NULL) {
1576 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1577 return AVERROR(ENOMEM);
1581 if (st->codec->extradata_size < language_count * 2)
1582 return AVERROR_INVALIDDATA;
1584 extradata = st->codec->extradata;
1586 for (i = 0; i < language_count; i++) {
1587 language[i * 4 + 0] = get8(pp, desc_end);
1588 language[i * 4 + 1] = get8(pp, desc_end);
1589 language[i * 4 + 2] = get8(pp, desc_end);
1590 language[i * 4 + 3] = ',';
1592 memcpy(extradata, *pp, 2);
1598 language[i * 4 - 1] = 0;
1599 av_dict_set(&st->metadata, "language", language, 0);
1603 case 0x59: /* subtitling descriptor */
1605 /* 8 bytes per DVB subtitle substream data:
1606 * ISO_639_language_code (3 bytes),
1607 * subtitling_type (1 byte),
1608 * composition_page_id (2 bytes),
1609 * ancillary_page_id (2 bytes) */
1610 int language_count = desc_len / 8;
1612 if (desc_len > 0 && desc_len % 8 != 0)
1613 return AVERROR_INVALIDDATA;
1615 if (language_count > 1) {
1616 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1619 if (language_count > 0) {
1622 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1623 if (language_count > sizeof(language) / 4) {
1624 language_count = sizeof(language) / 4;
1627 if (st->codec->extradata == NULL) {
1628 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1629 return AVERROR(ENOMEM);
1633 if (st->codec->extradata_size < language_count * 5)
1634 return AVERROR_INVALIDDATA;
1636 extradata = st->codec->extradata;
1638 for (i = 0; i < language_count; i++) {
1639 language[i * 4 + 0] = get8(pp, desc_end);
1640 language[i * 4 + 1] = get8(pp, desc_end);
1641 language[i * 4 + 2] = get8(pp, desc_end);
1642 language[i * 4 + 3] = ',';
1644 /* hearing impaired subtitles detection using subtitling_type */
1646 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1647 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1648 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1649 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1650 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1651 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1652 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1656 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1657 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1663 language[i * 4 - 1] = 0;
1664 av_dict_set(&st->metadata, "language", language, 0);
1668 case 0x0a: /* ISO 639 language descriptor */
1669 for (i = 0; i + 4 <= desc_len; i += 4) {
1670 language[i + 0] = get8(pp, desc_end);
1671 language[i + 1] = get8(pp, desc_end);
1672 language[i + 2] = get8(pp, desc_end);
1673 language[i + 3] = ',';
1674 switch (get8(pp, desc_end)) {
1676 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1679 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1682 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1686 if (i && language[0]) {
1687 language[i - 1] = 0;
1688 av_dict_set(&st->metadata, "language", language, 0);
1691 case 0x05: /* registration descriptor */
1692 st->codec->codec_tag = bytestream_get_le32(pp);
1693 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1694 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1695 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1697 case 0x52: /* stream identifier descriptor */
1698 st->stream_identifier = 1 + get8(pp, desc_end);
1700 case 0x26: /* metadata descriptor */
1701 if (get16(pp, desc_end) == 0xFFFF)
1703 if (get8(pp, desc_end) == 0xFF) {
1704 st->codec->codec_tag = bytestream_get_le32(pp);
1705 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1706 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1716 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1718 MpegTSContext *ts = filter->u.section_filter.opaque;
1719 SectionHeader h1, *h = &h1;
1722 const uint8_t *p, *p_end, *desc_list_end;
1723 int program_info_length, pcr_pid, pid, stream_type;
1725 uint32_t prog_reg_desc = 0; /* registration descriptor */
1727 int mp4_descr_count = 0;
1728 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1731 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1732 hex_dump_debug(ts->stream, section, section_len);
1734 p_end = section + section_len - 4;
1736 if (parse_section_header(h, &p, p_end) < 0)
1739 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1740 h->id, h->sec_num, h->last_sec_num);
1742 if (h->tid != PMT_TID)
1744 if (ts->skip_changes)
1747 clear_program(ts, h->id);
1748 pcr_pid = get16(&p, p_end);
1752 add_pid_to_pmt(ts, h->id, pcr_pid);
1753 set_pcr_pid(ts->stream, h->id, pcr_pid);
1755 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1757 program_info_length = get16(&p, p_end);
1758 if (program_info_length < 0)
1760 program_info_length &= 0xfff;
1761 while (program_info_length >= 2) {
1763 tag = get8(&p, p_end);
1764 len = get8(&p, p_end);
1766 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1768 if (len > program_info_length - 2)
1769 // something else is broken, exit the program_descriptors_loop
1771 program_info_length -= len + 2;
1772 if (tag == 0x1d) { // IOD descriptor
1773 get8(&p, p_end); // scope
1774 get8(&p, p_end); // label
1776 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1777 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1778 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1779 prog_reg_desc = bytestream_get_le32(&p);
1784 p += program_info_length;
1788 // stop parsing after pmt, we found header
1789 if (!ts->stream->nb_streams)
1792 set_pmt_found(ts, h->id);
1798 stream_type = get8(&p, p_end);
1799 if (stream_type < 0)
1801 pid = get16(&p, p_end);
1805 if (pid == ts->current_pid)
1808 /* now create stream */
1809 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1810 pes = ts->pids[pid]->u.pes_filter.opaque;
1812 pes->st = avformat_new_stream(pes->stream, NULL);
1815 pes->st->id = pes->pid;
1818 } else if (stream_type != 0x13) {
1820 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1821 pes = add_pes_stream(ts, pid, pcr_pid);
1823 st = avformat_new_stream(pes->stream, NULL);
1829 int idx = ff_find_stream_index(ts->stream, pid);
1831 st = ts->stream->streams[idx];
1833 st = avformat_new_stream(ts->stream, NULL);
1837 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1844 if (pes && !pes->stream_type)
1845 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1847 add_pid_to_pmt(ts, h->id, pid);
1849 ff_program_add_stream_index(ts->stream, h->id, st->index);
1851 desc_list_len = get16(&p, p_end);
1852 if (desc_list_len < 0)
1854 desc_list_len &= 0xfff;
1855 desc_list_end = p + desc_list_len;
1856 if (desc_list_end > p_end)
1859 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1860 desc_list_end, mp4_descr,
1861 mp4_descr_count, pid, ts) < 0)
1864 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1865 stream_type == 0x83 && pes->sub_st) {
1866 ff_program_add_stream_index(ts->stream, h->id,
1867 pes->sub_st->index);
1868 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1874 if (!ts->pids[pcr_pid])
1875 mpegts_open_pcr_filter(ts, pcr_pid);
1878 for (i = 0; i < mp4_descr_count; i++)
1879 av_free(mp4_descr[i].dec_config_descr);
1882 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1884 MpegTSContext *ts = filter->u.section_filter.opaque;
1885 SectionHeader h1, *h = &h1;
1886 const uint8_t *p, *p_end;
1890 av_dlog(ts->stream, "PAT:\n");
1891 hex_dump_debug(ts->stream, section, section_len);
1893 p_end = section + section_len - 4;
1895 if (parse_section_header(h, &p, p_end) < 0)
1897 if (h->tid != PAT_TID)
1899 if (ts->skip_changes)
1902 ts->stream->ts_id = h->id;
1906 sid = get16(&p, p_end);
1909 pmt_pid = get16(&p, p_end);
1914 if (pmt_pid == ts->current_pid)
1917 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1919 if (sid == 0x0000) {
1922 MpegTSFilter *fil = ts->pids[pmt_pid];
1923 program = av_new_program(ts->stream, sid);
1924 program->program_num = sid;
1925 program->pmt_pid = pmt_pid;
1927 if ( fil->type != MPEGTS_SECTION
1928 || fil->pid != pmt_pid
1929 || fil->u.section_filter.section_cb != pmt_cb)
1930 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1932 if (!ts->pids[pmt_pid])
1933 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1934 add_pat_entry(ts, sid);
1935 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1936 add_pid_to_pmt(ts, sid, pmt_pid);
1942 for (j=0; j<ts->stream->nb_programs; j++) {
1943 for (i = 0; i < ts->nb_prg; i++)
1944 if (ts->prg[i].id == ts->stream->programs[j]->id)
1946 if (i==ts->nb_prg && !ts->skip_clear)
1947 clear_avprogram(ts, ts->stream->programs[j]->id);
1952 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1954 MpegTSContext *ts = filter->u.section_filter.opaque;
1955 SectionHeader h1, *h = &h1;
1956 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1957 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1958 char *name, *provider_name;
1960 av_dlog(ts->stream, "SDT:\n");
1961 hex_dump_debug(ts->stream, section, section_len);
1963 p_end = section + section_len - 4;
1965 if (parse_section_header(h, &p, p_end) < 0)
1967 if (h->tid != SDT_TID)
1969 if (ts->skip_changes)
1971 onid = get16(&p, p_end);
1974 val = get8(&p, p_end);
1978 sid = get16(&p, p_end);
1981 val = get8(&p, p_end);
1984 desc_list_len = get16(&p, p_end);
1985 if (desc_list_len < 0)
1987 desc_list_len &= 0xfff;
1988 desc_list_end = p + desc_list_len;
1989 if (desc_list_end > p_end)
1992 desc_tag = get8(&p, desc_list_end);
1995 desc_len = get8(&p, desc_list_end);
1996 desc_end = p + desc_len;
1997 if (desc_end > desc_list_end)
2000 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
2001 desc_tag, desc_len);
2005 service_type = get8(&p, p_end);
2006 if (service_type < 0)
2008 provider_name = getstr8(&p, p_end);
2011 name = getstr8(&p, p_end);
2013 AVProgram *program = av_new_program(ts->stream, sid);
2015 av_dict_set(&program->metadata, "service_name", name, 0);
2016 av_dict_set(&program->metadata, "service_provider",
2021 av_free(provider_name);
2032 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2033 const uint8_t *packet);
2035 /* handle one TS packet */
2036 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2039 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2040 has_adaptation, has_payload;
2041 const uint8_t *p, *p_end;
2044 pid = AV_RB16(packet + 1) & 0x1fff;
2045 if (pid && discard_pid(ts, pid))
2047 is_start = packet[1] & 0x40;
2048 tss = ts->pids[pid];
2049 if (ts->auto_guess && !tss && is_start) {
2050 add_pes_stream(ts, pid, -1);
2051 tss = ts->pids[pid];
2055 ts->current_pid = pid;
2057 afc = (packet[3] >> 4) & 3;
2058 if (afc == 0) /* reserved value */
2060 has_adaptation = afc & 2;
2061 has_payload = afc & 1;
2062 is_discontinuity = has_adaptation &&
2063 packet[4] != 0 && /* with length > 0 */
2064 (packet[5] & 0x80); /* and discontinuity indicated */
2066 /* continuity check (currently not used) */
2067 cc = (packet[3] & 0xf);
2068 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2069 cc_ok = pid == 0x1FFF || // null packet PID
2076 av_log(ts->stream, AV_LOG_DEBUG,
2077 "Continuity check failed for pid %d expected %d got %d\n",
2078 pid, expected_cc, cc);
2079 if (tss->type == MPEGTS_PES) {
2080 PESContext *pc = tss->u.pes_filter.opaque;
2081 pc->flags |= AV_PKT_FLAG_CORRUPT;
2086 if (has_adaptation) {
2089 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2090 tss->last_pcr = pcr_h * 300 + pcr_l;
2091 /* skip adaptation field */
2094 /* if past the end of packet, ignore */
2095 p_end = packet + TS_PACKET_SIZE;
2096 if (p >= p_end || !has_payload)
2099 pos = avio_tell(ts->stream->pb);
2101 av_assert0(pos >= TS_PACKET_SIZE);
2102 ts->pos47_full = pos - TS_PACKET_SIZE;
2105 if (tss->type == MPEGTS_SECTION) {
2107 /* pointer field present */
2109 if (p + len > p_end)
2112 /* write remaining section bytes */
2113 write_section_data(ts, tss,
2115 /* check whether filter has been closed */
2121 write_section_data(ts, tss,
2126 write_section_data(ts, tss,
2131 // stop find_stream_info from waiting for more streams
2132 // when all programs have received a PMT
2133 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2135 for (i = 0; i < ts->nb_prg; i++) {
2136 if (!ts->prg[i].pmt_found)
2139 if (i == ts->nb_prg && ts->nb_prg > 0) {
2140 if (ts->stream->nb_streams > 1 || pos > 100000) {
2141 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2142 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2149 // Note: The position here points actually behind the current packet.
2150 if (tss->type == MPEGTS_PES) {
2151 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2152 pos - ts->raw_packet_size)) < 0)
2160 static void reanalyze(MpegTSContext *ts) {
2161 AVIOContext *pb = ts->stream->pb;
2162 int64_t pos = avio_tell(pb);
2165 pos -= ts->pos47_full;
2166 if (pos == TS_PACKET_SIZE) {
2167 ts->size_stat[0] ++;
2168 } else if (pos == TS_DVHS_PACKET_SIZE) {
2169 ts->size_stat[1] ++;
2170 } else if (pos == TS_FEC_PACKET_SIZE) {
2171 ts->size_stat[2] ++;
2174 ts->size_stat_count ++;
2175 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2177 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2178 newsize = TS_PACKET_SIZE;
2179 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2180 newsize = TS_DVHS_PACKET_SIZE;
2181 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2182 newsize = TS_FEC_PACKET_SIZE;
2184 if (newsize && newsize != ts->raw_packet_size) {
2185 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2186 ts->raw_packet_size = newsize;
2188 ts->size_stat_count = 0;
2189 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2193 /* XXX: try to find a better synchro over several packets (use
2194 * get_packet_size() ?) */
2195 static int mpegts_resync(AVFormatContext *s)
2197 MpegTSContext *ts = s->priv_data;
2198 AVIOContext *pb = s->pb;
2201 for (i = 0; i < ts->resync_size; i++) {
2206 avio_seek(pb, -1, SEEK_CUR);
2207 reanalyze(s->priv_data);
2211 av_log(s, AV_LOG_ERROR,
2212 "max resync size reached, could not find sync byte\n");
2214 return AVERROR_INVALIDDATA;
2217 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2218 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2219 const uint8_t **data)
2221 AVIOContext *pb = s->pb;
2225 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2226 if (len != TS_PACKET_SIZE)
2227 return len < 0 ? len : AVERROR_EOF;
2228 /* check packet sync byte */
2229 if ((*data)[0] != 0x47) {
2230 /* find a new packet start */
2231 uint64_t pos = avio_tell(pb);
2232 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2234 if (mpegts_resync(s) < 0)
2235 return AVERROR(EAGAIN);
2245 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2247 AVIOContext *pb = s->pb;
2248 int skip = raw_packet_size - TS_PACKET_SIZE;
2250 avio_skip(pb, skip);
2253 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2255 AVFormatContext *s = ts->stream;
2256 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2257 const uint8_t *data;
2261 if (avio_tell(s->pb) != ts->last_pos) {
2263 av_dlog(ts->stream, "Skipping after seek\n");
2264 /* seek detected, flush pes buffer */
2265 for (i = 0; i < NB_PID_MAX; i++) {
2267 if (ts->pids[i]->type == MPEGTS_PES) {
2268 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2269 av_buffer_unref(&pes->buffer);
2270 pes->data_index = 0;
2271 pes->state = MPEGTS_SKIP; /* skip until pes header */
2273 ts->pids[i]->last_cc = -1;
2274 ts->pids[i]->last_pcr = -1;
2281 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2284 if (nb_packets != 0 && packet_num >= nb_packets ||
2285 ts->stop_parse > 1) {
2286 ret = AVERROR(EAGAIN);
2289 if (ts->stop_parse > 0)
2292 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2295 ret = handle_packet(ts, data);
2296 finished_reading_packet(s, ts->raw_packet_size);
2300 ts->last_pos = avio_tell(s->pb);
2304 static int mpegts_probe(AVProbeData *p)
2306 const int size = p->buf_size;
2310 int check_count = size / TS_FEC_PACKET_SIZE;
2311 #define CHECK_COUNT 10
2312 #define CHECK_BLOCK 100
2314 if (check_count < CHECK_COUNT)
2315 return AVERROR_INVALIDDATA;
2317 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2318 int left = FFMIN(check_count - i, CHECK_BLOCK);
2319 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2320 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2321 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2322 score = FFMAX3(score, dvhs_score, fec_score);
2324 maxscore = FFMAX(maxscore, score);
2327 sumscore = sumscore * CHECK_COUNT / check_count;
2328 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2330 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2332 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2333 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2335 return AVERROR_INVALIDDATA;
2338 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2339 * (-1) if not available */
2340 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2342 int afc, len, flags;
2346 afc = (packet[3] >> 4) & 3;
2348 return AVERROR_INVALIDDATA;
2353 return AVERROR_INVALIDDATA;
2356 if (!(flags & 0x10))
2357 return AVERROR_INVALIDDATA;
2359 return AVERROR_INVALIDDATA;
2361 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2362 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2366 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2368 /* NOTE: We attempt to seek on non-seekable files as well, as the
2369 * probe buffer usually is big enough. Only warn if the seek failed
2370 * on files where the seek should work. */
2371 if (avio_seek(pb, pos, SEEK_SET) < 0)
2372 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2375 static int mpegts_read_header(AVFormatContext *s)
2377 MpegTSContext *ts = s->priv_data;
2378 AVIOContext *pb = s->pb;
2379 uint8_t buf[8 * 1024] = {0};
2381 int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2383 ffio_ensure_seekback(pb, probesize);
2385 /* read the first 8192 bytes to get packet size */
2386 pos = avio_tell(pb);
2387 len = avio_read(pb, buf, sizeof(buf));
2388 ts->raw_packet_size = get_packet_size(buf, len);
2389 if (ts->raw_packet_size <= 0) {
2390 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2391 ts->raw_packet_size = TS_PACKET_SIZE;
2396 if (s->iformat == &ff_mpegts_demuxer) {
2399 /* first do a scan to get all the services */
2400 seek_back(s, pb, pos);
2402 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2404 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2406 handle_packets(ts, probesize / ts->raw_packet_size);
2407 /* if could not find service, enable auto_guess */
2411 av_dlog(ts->stream, "tuning done\n");
2413 s->ctx_flags |= AVFMTCTX_NOHEADER;
2416 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2417 int64_t pcrs[2], pcr_h;
2418 int packet_count[2];
2419 uint8_t packet[TS_PACKET_SIZE];
2420 const uint8_t *data;
2422 /* only read packets */
2424 st = avformat_new_stream(s, NULL);
2426 return AVERROR(ENOMEM);
2427 avpriv_set_pts_info(st, 60, 1, 27000000);
2428 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2429 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2431 /* we iterate until we find two PCRs to estimate the bitrate */
2436 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2439 pid = AV_RB16(data + 1) & 0x1fff;
2440 if ((pcr_pid == -1 || pcr_pid == pid) &&
2441 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2442 finished_reading_packet(s, ts->raw_packet_size);
2444 packet_count[nb_pcrs] = nb_packets;
2445 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2450 finished_reading_packet(s, ts->raw_packet_size);
2455 /* NOTE1: the bitrate is computed without the FEC */
2456 /* NOTE2: it is only the bitrate of the start of the stream */
2457 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2458 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2459 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2460 st->codec->bit_rate = s->bit_rate;
2461 st->start_time = ts->cur_pcr;
2462 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2463 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2466 seek_back(s, pb, pos);
2470 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2472 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2474 MpegTSContext *ts = s->priv_data;
2476 int64_t pcr_h, next_pcr_h, pos;
2477 int pcr_l, next_pcr_l;
2478 uint8_t pcr_buf[12];
2479 const uint8_t *data;
2481 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2482 return AVERROR(ENOMEM);
2483 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2484 pkt->pos = avio_tell(s->pb);
2486 av_free_packet(pkt);
2489 if (data != pkt->data)
2490 memcpy(pkt->data, data, ts->raw_packet_size);
2491 finished_reading_packet(s, ts->raw_packet_size);
2492 if (ts->mpeg2ts_compute_pcr) {
2493 /* compute exact PCR for each packet */
2494 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2495 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2496 pos = avio_tell(s->pb);
2497 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2498 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2499 avio_read(s->pb, pcr_buf, 12);
2500 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2501 /* XXX: not precise enough */
2503 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2508 avio_seek(s->pb, pos, SEEK_SET);
2509 /* no next PCR found: we use previous increment */
2510 ts->cur_pcr = pcr_h * 300 + pcr_l;
2512 pkt->pts = ts->cur_pcr;
2513 pkt->duration = ts->pcr_incr;
2514 ts->cur_pcr += ts->pcr_incr;
2516 pkt->stream_index = 0;
2520 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2522 MpegTSContext *ts = s->priv_data;
2527 ret = handle_packets(ts, 0);
2529 av_free_packet(ts->pkt);
2530 /* flush pes data left */
2531 for (i = 0; i < NB_PID_MAX; i++)
2532 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2533 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2534 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2535 new_pes_packet(pes, pkt);
2536 pes->state = MPEGTS_SKIP;
2543 if (!ret && pkt->size < 0)
2544 ret = AVERROR(EINTR);
2548 static void mpegts_free(MpegTSContext *ts)
2554 for (i = 0; i < NB_PID_MAX; i++)
2556 mpegts_close_filter(ts, ts->pids[i]);
2559 static int mpegts_read_close(AVFormatContext *s)
2561 MpegTSContext *ts = s->priv_data;
2566 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2567 int64_t *ppos, int64_t pos_limit)
2569 MpegTSContext *ts = s->priv_data;
2570 int64_t pos, timestamp;
2571 uint8_t buf[TS_PACKET_SIZE];
2572 int pcr_l, pcr_pid =
2573 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2574 int pos47 = ts->pos47_full % ts->raw_packet_size;
2576 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2577 ts->raw_packet_size + pos47;
2578 while(pos < pos_limit) {
2579 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2580 return AV_NOPTS_VALUE;
2581 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2582 return AV_NOPTS_VALUE;
2583 if (buf[0] != 0x47) {
2584 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2585 if (mpegts_resync(s) < 0)
2586 return AV_NOPTS_VALUE;
2587 pos = avio_tell(s->pb);
2590 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2591 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2595 pos += ts->raw_packet_size;
2598 return AV_NOPTS_VALUE;
2601 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2602 int64_t *ppos, int64_t pos_limit)
2604 MpegTSContext *ts = s->priv_data;
2606 int pos47 = ts->pos47_full % ts->raw_packet_size;
2607 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2608 ff_read_frame_flush(s);
2609 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2610 return AV_NOPTS_VALUE;
2611 while(pos < pos_limit) {
2614 av_init_packet(&pkt);
2615 ret = av_read_frame(s, &pkt);
2617 return AV_NOPTS_VALUE;
2618 av_free_packet(&pkt);
2619 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2620 ff_reduce_index(s, pkt.stream_index);
2621 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2622 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2630 return AV_NOPTS_VALUE;
2633 /**************************************************************/
2634 /* parsing functions - called from other demuxers such as RTP */
2636 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
2640 ts = av_mallocz(sizeof(MpegTSContext));
2643 /* no stream case, currently used by RTP */
2644 ts->raw_packet_size = TS_PACKET_SIZE;
2647 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2648 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2653 /* return the consumed length if a packet was output, or -1 if no
2654 * packet is output */
2655 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2656 const uint8_t *buf, int len)
2664 if (len < TS_PACKET_SIZE)
2665 return AVERROR_INVALIDDATA;
2666 if (buf[0] != 0x47) {
2670 handle_packet(ts, buf);
2671 buf += TS_PACKET_SIZE;
2672 len -= TS_PACKET_SIZE;
2673 if (ts->stop_parse == 1)
2680 void avpriv_mpegts_parse_close(MpegTSContext *ts)
2686 AVInputFormat ff_mpegts_demuxer = {
2688 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2689 .priv_data_size = sizeof(MpegTSContext),
2690 .read_probe = mpegts_probe,
2691 .read_header = mpegts_read_header,
2692 .read_packet = mpegts_read_packet,
2693 .read_close = mpegts_read_close,
2694 .read_timestamp = mpegts_get_dts,
2695 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2696 .priv_class = &mpegts_class,
2699 AVInputFormat ff_mpegtsraw_demuxer = {
2700 .name = "mpegtsraw",
2701 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2702 .priv_data_size = sizeof(MpegTSContext),
2703 .read_header = mpegts_read_header,
2704 .read_packet = mpegts_raw_read_packet,
2705 .read_close = mpegts_read_close,
2706 .read_timestamp = mpegts_get_dts,
2707 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2708 .priv_class = &mpegtsraw_class,