2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avassert.h"
30 #include "libavcodec/bytestream.h"
31 #include "libavcodec/get_bits.h"
35 #include "avio_internal.h"
40 /* maximum size in which we look for synchronisation if
41 * synchronisation is lost */
42 #define MAX_RESYNC_SIZE 65536
44 #define MAX_PES_PAYLOAD 200 * 1024
46 #define MAX_MP4_DESCR_COUNT 16
48 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
50 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
51 (modulus) = (dividend) % (divisor); \
52 (prev_dividend) = (dividend); \
55 enum MpegTSFilterType {
61 typedef struct MpegTSFilter MpegTSFilter;
63 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
64 int is_start, int64_t pos);
66 typedef struct MpegTSPESFilter {
71 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
73 typedef void SetServiceCallback (void *opaque, int ret);
75 typedef struct MpegTSSectionFilter {
79 unsigned int check_crc : 1;
80 unsigned int end_of_section_reached : 1;
81 SectionCallback *section_cb;
83 } MpegTSSectionFilter;
88 int last_cc; /* last cc code (-1 if first packet) */
90 enum MpegTSFilterType type;
92 MpegTSPESFilter pes_filter;
93 MpegTSSectionFilter section_filter;
97 #define MAX_PIDS_PER_PROGRAM 64
99 unsigned int id; // program id/service id
100 unsigned int nb_pids;
101 unsigned int pids[MAX_PIDS_PER_PROGRAM];
103 /** have we found pmt for this program */
107 struct MpegTSContext {
108 const AVClass *class;
110 AVFormatContext *stream;
111 /** raw packet size, including FEC if present */
116 #define SIZE_STAT_THRESHOLD 10
120 /** if true, all pids are analyzed to find streams */
123 /** compute exact PCR for each transport stream packet */
124 int mpeg2ts_compute_pcr;
126 /** fix dvb teletext pts */
127 int fix_teletext_pts;
129 int64_t cur_pcr; /**< used to estimate the exact PCR */
130 int pcr_incr; /**< used to estimate the exact PCR */
132 /* data needed to handle file based ts */
133 /** stop parsing loop */
135 /** packet containing Audio/Video data */
137 /** to detect seek */
143 /******************************************/
144 /* private mpegts data */
146 /** structure to keep track of Program->pids mapping */
150 int8_t crc_validity[NB_PID_MAX];
151 /** filters for various streams specified by PMT + for the PAT and PMT */
152 MpegTSFilter *pids[NB_PID_MAX];
156 static const AVOption mpegtsraw_options[] = {
157 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
158 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
159 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
160 { "ts_packetsize", "Output option carrying the raw packet size.",
161 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
163 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
167 static const AVClass mpegtsraw_class = {
168 .class_name = "mpegtsraw demuxer",
169 .item_name = av_default_item_name,
170 .option = mpegtsraw_options,
171 .version = LIBAVUTIL_VERSION_INT,
174 static const AVOption mpegts_options[] = {
175 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
176 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
177 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
178 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
179 {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
180 {.i64 = 0}, 0, 1, 0 },
181 {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
182 {.i64 = 0}, 0, 1, 0 },
186 static const AVClass mpegts_class = {
187 .class_name = "mpegts demuxer",
188 .item_name = av_default_item_name,
189 .option = mpegts_options,
190 .version = LIBAVUTIL_VERSION_INT,
193 /* TS stream handling */
198 MPEGTS_PESHEADER_FILL,
203 /* enough for PES header + length */
204 #define PES_START_SIZE 6
205 #define PES_HEADER_SIZE 9
206 #define MAX_PES_HEADER_SIZE (9 + 255)
208 typedef struct PESContext {
210 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
213 AVFormatContext *stream;
215 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
216 enum MpegTSState state;
217 /* used to get the format */
219 int flags; /**< copied to the AVPacket flags */
222 int extended_stream_id;
224 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
225 uint8_t header[MAX_PES_HEADER_SIZE];
230 extern AVInputFormat ff_mpegts_demuxer;
232 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
235 for (i = 0; i < ts->nb_prg; i++) {
236 if (ts->prg[i].id == programid) {
243 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
245 AVProgram *prg = NULL;
248 for (i = 0; i < ts->stream->nb_programs; i++)
249 if (ts->stream->programs[i]->id == programid) {
250 prg = ts->stream->programs[i];
255 prg->nb_stream_indexes = 0;
258 static void clear_program(MpegTSContext *ts, unsigned int programid)
262 clear_avprogram(ts, programid);
263 for (i = 0; i < ts->nb_prg; i++)
264 if (ts->prg[i].id == programid) {
265 ts->prg[i].nb_pids = 0;
266 ts->prg[i].pmt_found = 0;
270 static void clear_programs(MpegTSContext *ts)
276 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
279 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
283 p = &ts->prg[ts->nb_prg];
290 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
293 struct Program *p = get_program(ts, programid);
297 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
299 p->pids[p->nb_pids++] = pid;
302 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
304 struct Program *p = get_program(ts, programid);
311 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
314 for (i = 0; i < s->nb_programs; i++) {
315 if (s->programs[i]->id == programid) {
316 s->programs[i]->pcr_pid = pid;
323 * @brief discard_pid() decides if the pid is to be discarded according
324 * to caller's programs selection
325 * @param ts : - TS context
327 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
330 static int discard_pid(MpegTSContext *ts, unsigned int pid)
333 int used = 0, discarded = 0;
336 /* If none of the programs have .discard=AVDISCARD_ALL then there's
337 * no way we have to discard this packet */
338 for (k = 0; k < ts->stream->nb_programs; k++)
339 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
341 if (k == ts->stream->nb_programs)
344 for (i = 0; i < ts->nb_prg; i++) {
346 for (j = 0; j < p->nb_pids; j++) {
347 if (p->pids[j] != pid)
349 // is program with id p->id set to be discarded?
350 for (k = 0; k < ts->stream->nb_programs; k++) {
351 if (ts->stream->programs[k]->id == p->id) {
352 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
361 return !used && discarded;
365 * Assemble PES packets out of TS packets, and then call the "section_cb"
366 * function when they are complete.
368 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
369 const uint8_t *buf, int buf_size, int is_start)
371 MpegTSSectionFilter *tss = &tss1->u.section_filter;
375 memcpy(tss->section_buf, buf, buf_size);
376 tss->section_index = buf_size;
377 tss->section_h_size = -1;
378 tss->end_of_section_reached = 0;
380 if (tss->end_of_section_reached)
382 len = 4096 - tss->section_index;
385 memcpy(tss->section_buf + tss->section_index, buf, len);
386 tss->section_index += len;
389 /* compute section length if possible */
390 if (tss->section_h_size == -1 && tss->section_index >= 3) {
391 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
394 tss->section_h_size = len;
397 if (tss->section_h_size != -1 &&
398 tss->section_index >= tss->section_h_size) {
400 tss->end_of_section_reached = 1;
402 if (tss->check_crc) {
403 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
405 ts->crc_validity[ tss1->pid ] = 100;
406 }else if (ts->crc_validity[ tss1->pid ] > -10) {
407 ts->crc_validity[ tss1->pid ]--;
412 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
416 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
417 enum MpegTSFilterType type)
419 MpegTSFilter *filter;
421 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
423 if (pid >= NB_PID_MAX || ts->pids[pid])
425 filter = av_mallocz(sizeof(MpegTSFilter));
428 ts->pids[pid] = filter;
433 filter->last_cc = -1;
434 filter->last_pcr= -1;
439 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
441 SectionCallback *section_cb,
445 MpegTSFilter *filter;
446 MpegTSSectionFilter *sec;
448 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
450 sec = &filter->u.section_filter;
451 sec->section_cb = section_cb;
452 sec->opaque = opaque;
453 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
454 sec->check_crc = check_crc;
455 if (!sec->section_buf) {
462 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
466 MpegTSFilter *filter;
467 MpegTSPESFilter *pes;
469 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
472 pes = &filter->u.pes_filter;
473 pes->pes_cb = pes_cb;
474 pes->opaque = opaque;
478 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
480 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
483 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
488 if (filter->type == MPEGTS_SECTION)
489 av_freep(&filter->u.section_filter.section_buf);
490 else if (filter->type == MPEGTS_PES) {
491 PESContext *pes = filter->u.pes_filter.opaque;
492 av_buffer_unref(&pes->buffer);
493 /* referenced private data will be freed later in
494 * avformat_close_input */
495 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
496 av_freep(&filter->u.pes_filter.opaque);
501 ts->pids[pid] = NULL;
504 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
506 int stat[TS_MAX_PACKET_SIZE];
511 memset(stat, 0, packet_size * sizeof(*stat));
513 for (i = 0; i < size - 3; i++) {
514 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
515 int x = i % packet_size;
517 if (stat[x] > best_score) {
518 best_score = stat[x];
521 } else if (stat[x] > best_score2) {
522 best_score2 = stat[x];
527 return best_score - best_score2;
530 /* autodetect fec presence. Must have at least 1024 bytes */
531 static int get_packet_size(const uint8_t *buf, int size)
533 int score, fec_score, dvhs_score;
535 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
536 return AVERROR_INVALIDDATA;
538 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
539 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
540 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
541 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
542 score, dvhs_score, fec_score);
544 if (score > fec_score && score > dvhs_score)
545 return TS_PACKET_SIZE;
546 else if (dvhs_score > score && dvhs_score > fec_score)
547 return TS_DVHS_PACKET_SIZE;
548 else if (score < fec_score && dvhs_score < fec_score)
549 return TS_FEC_PACKET_SIZE;
551 return AVERROR_INVALIDDATA;
554 typedef struct SectionHeader {
559 uint8_t last_sec_num;
562 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
569 return AVERROR_INVALIDDATA;
575 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
581 if ((p + 1) >= p_end)
582 return AVERROR_INVALIDDATA;
589 /* read and allocate a DVB string preceded by its length */
590 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
597 len = get8(&p, p_end);
600 if ((p + len) > p_end)
602 str = av_malloc(len + 1);
612 static int parse_section_header(SectionHeader *h,
613 const uint8_t **pp, const uint8_t *p_end)
617 val = get8(pp, p_end);
622 val = get16(pp, p_end);
626 val = get8(pp, p_end);
629 h->version = (val >> 1) & 0x1f;
630 val = get8(pp, p_end);
634 val = get8(pp, p_end);
637 h->last_sec_num = val;
642 uint32_t stream_type;
643 enum AVMediaType codec_type;
644 enum AVCodecID codec_id;
647 static const StreamType ISO_types[] = {
648 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
649 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
650 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
651 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
652 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
653 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
654 /* Makito encoder sets stream type 0x11 for AAC,
655 * so auto-detect LOAS/LATM instead of hardcoding it. */
656 #if !CONFIG_LOAS_DEMUXER
657 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
659 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
660 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
661 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
662 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
663 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
667 static const StreamType HDMV_types[] = {
668 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
669 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
670 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
671 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
672 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
673 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
674 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
675 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
676 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
677 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
682 static const StreamType MISC_types[] = {
683 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
684 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
688 static const StreamType REGD_types[] = {
689 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
690 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
691 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
692 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
693 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
694 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
695 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
696 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
697 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
701 static const StreamType METADATA_types[] = {
702 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
703 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
707 /* descriptor present */
708 static const StreamType DESC_types[] = {
709 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
710 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
711 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
712 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
713 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
717 static void mpegts_find_stream_type(AVStream *st,
718 uint32_t stream_type,
719 const StreamType *types)
721 if (avcodec_is_open(st->codec)) {
722 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
726 for (; types->stream_type; types++)
727 if (stream_type == types->stream_type) {
728 st->codec->codec_type = types->codec_type;
729 st->codec->codec_id = types->codec_id;
730 st->request_probe = 0;
735 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
736 uint32_t stream_type, uint32_t prog_reg_desc)
738 int old_codec_type = st->codec->codec_type;
739 int old_codec_id = st->codec->codec_id;
741 if (avcodec_is_open(st->codec)) {
742 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
746 avpriv_set_pts_info(st, 33, 1, 90000);
748 st->codec->codec_type = AVMEDIA_TYPE_DATA;
749 st->codec->codec_id = AV_CODEC_ID_NONE;
750 st->need_parsing = AVSTREAM_PARSE_FULL;
752 pes->stream_type = stream_type;
754 av_log(pes->stream, AV_LOG_DEBUG,
755 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
756 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
758 st->codec->codec_tag = pes->stream_type;
760 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
761 if ((prog_reg_desc == AV_RL32("HDMV") ||
762 prog_reg_desc == AV_RL32("HDPR")) &&
763 st->codec->codec_id == AV_CODEC_ID_NONE) {
764 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
765 if (pes->stream_type == 0x83) {
766 // HDMV TrueHD streams also contain an AC3 coded version of the
767 // audio track - add a second stream for this
769 // priv_data cannot be shared between streams
770 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
772 return AVERROR(ENOMEM);
773 memcpy(sub_pes, pes, sizeof(*sub_pes));
775 sub_st = avformat_new_stream(pes->stream, NULL);
778 return AVERROR(ENOMEM);
781 sub_st->id = pes->pid;
782 avpriv_set_pts_info(sub_st, 33, 1, 90000);
783 sub_st->priv_data = sub_pes;
784 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
785 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
786 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
787 sub_pes->sub_st = pes->sub_st = sub_st;
790 if (st->codec->codec_id == AV_CODEC_ID_NONE)
791 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
792 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
793 st->codec->codec_id = old_codec_id;
794 st->codec->codec_type = old_codec_type;
800 static void reset_pes_packet_state(PESContext *pes)
802 pes->pts = AV_NOPTS_VALUE;
803 pes->dts = AV_NOPTS_VALUE;
806 av_buffer_unref(&pes->buffer);
809 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
813 pkt->buf = pes->buffer;
814 pkt->data = pes->buffer->data;
815 pkt->size = pes->data_index;
817 if (pes->total_size != MAX_PES_PAYLOAD &&
818 pes->pes_header_size + pes->data_index != pes->total_size +
820 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
821 pes->flags |= AV_PKT_FLAG_CORRUPT;
823 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
825 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
826 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
827 pkt->stream_index = pes->sub_st->index;
829 pkt->stream_index = pes->st->index;
832 /* store position of first TS packet of this PES packet */
833 pkt->pos = pes->ts_packet_pos;
834 pkt->flags = pes->flags;
837 reset_pes_packet_state(pes);
840 static uint64_t get_ts64(GetBitContext *gb, int bits)
842 if (get_bits_left(gb) < bits)
843 return AV_NOPTS_VALUE;
844 return get_bits64(gb, bits);
847 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
848 const uint8_t *buf, int buf_size)
851 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
852 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
853 int dts_flag = -1, cts_flag = -1;
854 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
856 init_get_bits(&gb, buf, buf_size * 8);
858 if (sl->use_au_start)
859 au_start_flag = get_bits1(&gb);
861 au_end_flag = get_bits1(&gb);
862 if (!sl->use_au_start && !sl->use_au_end)
863 au_start_flag = au_end_flag = 1;
865 ocr_flag = get_bits1(&gb);
867 idle_flag = get_bits1(&gb);
869 padding_flag = get_bits1(&gb);
871 padding_bits = get_bits(&gb, 3);
873 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
874 if (sl->packet_seq_num_len)
875 skip_bits_long(&gb, sl->packet_seq_num_len);
876 if (sl->degr_prior_len)
878 skip_bits(&gb, sl->degr_prior_len);
880 skip_bits_long(&gb, sl->ocr_len);
882 if (sl->use_rand_acc_pt)
884 if (sl->au_seq_num_len > 0)
885 skip_bits_long(&gb, sl->au_seq_num_len);
886 if (sl->use_timestamps) {
887 dts_flag = get_bits1(&gb);
888 cts_flag = get_bits1(&gb);
891 if (sl->inst_bitrate_len)
892 inst_bitrate_flag = get_bits1(&gb);
894 dts = get_ts64(&gb, sl->timestamp_len);
896 cts = get_ts64(&gb, sl->timestamp_len);
898 skip_bits_long(&gb, sl->au_len);
899 if (inst_bitrate_flag)
900 skip_bits_long(&gb, sl->inst_bitrate_len);
903 if (dts != AV_NOPTS_VALUE)
905 if (cts != AV_NOPTS_VALUE)
908 if (sl->timestamp_len && sl->timestamp_res)
909 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
911 return (get_bits_count(&gb) + 7) >> 3;
914 /* return non zero if a packet could be constructed */
915 static int mpegts_push_data(MpegTSFilter *filter,
916 const uint8_t *buf, int buf_size, int is_start,
919 PESContext *pes = filter->u.pes_filter.opaque;
920 MpegTSContext *ts = pes->ts;
928 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
929 new_pes_packet(pes, ts->pkt);
932 reset_pes_packet_state(pes);
934 pes->state = MPEGTS_HEADER;
935 pes->ts_packet_pos = pos;
938 while (buf_size > 0) {
939 switch (pes->state) {
941 len = PES_START_SIZE - pes->data_index;
944 memcpy(pes->header + pes->data_index, p, len);
945 pes->data_index += len;
948 if (pes->data_index == PES_START_SIZE) {
949 /* we got all the PES or section header. We can now
951 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
952 pes->header[2] == 0x01) {
953 /* it must be an mpeg2 PES stream */
954 code = pes->header[3] | 0x100;
955 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
958 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
960 pes->sub_st->discard == AVDISCARD_ALL)) ||
961 code == 0x1be) /* padding_stream */
964 /* stream not present in PMT */
966 if (ts->skip_changes)
969 pes->st = avformat_new_stream(ts->stream, NULL);
971 return AVERROR(ENOMEM);
972 pes->st->id = pes->pid;
973 mpegts_set_stream_info(pes->st, pes, 0, 0);
976 pes->total_size = AV_RB16(pes->header + 4);
977 /* NOTE: a zero total size means the PES size is
979 if (!pes->total_size)
980 pes->total_size = MAX_PES_PAYLOAD;
982 /* allocate pes buffer */
983 pes->buffer = av_buffer_alloc(pes->total_size +
984 FF_INPUT_BUFFER_PADDING_SIZE);
986 return AVERROR(ENOMEM);
988 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
989 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
990 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
991 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
992 pes->state = MPEGTS_PESHEADER;
993 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
995 "pid=%x stream_type=%x probing\n",
998 pes->st->request_probe = 1;
1001 pes->state = MPEGTS_PAYLOAD;
1002 pes->data_index = 0;
1005 /* otherwise, it should be a table */
1008 pes->state = MPEGTS_SKIP;
1013 /**********************************************/
1014 /* PES packing parsing */
1015 case MPEGTS_PESHEADER:
1016 len = PES_HEADER_SIZE - pes->data_index;
1018 return AVERROR_INVALIDDATA;
1021 memcpy(pes->header + pes->data_index, p, len);
1022 pes->data_index += len;
1025 if (pes->data_index == PES_HEADER_SIZE) {
1026 pes->pes_header_size = pes->header[8] + 9;
1027 pes->state = MPEGTS_PESHEADER_FILL;
1030 case MPEGTS_PESHEADER_FILL:
1031 len = pes->pes_header_size - pes->data_index;
1033 return AVERROR_INVALIDDATA;
1036 memcpy(pes->header + pes->data_index, p, len);
1037 pes->data_index += len;
1040 if (pes->data_index == pes->pes_header_size) {
1042 unsigned int flags, pes_ext, skip;
1044 flags = pes->header[7];
1045 r = pes->header + 9;
1046 pes->pts = AV_NOPTS_VALUE;
1047 pes->dts = AV_NOPTS_VALUE;
1048 if ((flags & 0xc0) == 0x80) {
1049 pes->dts = pes->pts = ff_parse_pes_pts(r);
1051 } else if ((flags & 0xc0) == 0xc0) {
1052 pes->pts = ff_parse_pes_pts(r);
1054 pes->dts = ff_parse_pes_pts(r);
1057 pes->extended_stream_id = -1;
1058 if (flags & 0x01) { /* PES extension */
1060 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1061 skip = (pes_ext >> 4) & 0xb;
1064 if ((pes_ext & 0x41) == 0x01 &&
1065 (r + 2) <= (pes->header + pes->pes_header_size)) {
1066 /* PES extension 2 */
1067 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1068 pes->extended_stream_id = r[1];
1072 /* we got the full header. We parse it and get the payload */
1073 pes->state = MPEGTS_PAYLOAD;
1074 pes->data_index = 0;
1075 if (pes->stream_type == 0x12 && buf_size > 0) {
1076 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1078 pes->pes_header_size += sl_header_bytes;
1079 p += sl_header_bytes;
1080 buf_size -= sl_header_bytes;
1082 if (pes->stream_type == 0x15 && buf_size >= 5) {
1083 /* skip metadata access unit header */
1084 pes->pes_header_size += 5;
1088 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1089 AVProgram *p = NULL;
1090 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1091 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1092 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1094 AVStream *st = NULL;
1095 if (f->type == MPEGTS_PES) {
1096 PESContext *pcrpes = f->u.pes_filter.opaque;
1099 } else if (f->type == MPEGTS_PCR) {
1101 for (i = 0; i < p->nb_stream_indexes; i++) {
1102 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1103 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1107 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1108 // teletext packets do not always have correct timestamps,
1109 // the standard says they should be handled after 40.6 ms at most,
1110 // and the pcr error to this packet should be no more than 100 ms.
1111 // TODO: we should interpolate the PCR, not just use the last one
1112 int64_t pcr = f->last_pcr / 300;
1113 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1114 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1115 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1116 pes->pts = pes->dts = pcr;
1117 } else if (pes->dts > pcr + 3654 + 9000) {
1118 pes->pts = pes->dts = pcr + 3654 + 9000;
1128 case MPEGTS_PAYLOAD:
1130 if (pes->data_index > 0 &&
1131 pes->data_index + buf_size > pes->total_size) {
1132 new_pes_packet(pes, ts->pkt);
1133 pes->total_size = MAX_PES_PAYLOAD;
1134 pes->buffer = av_buffer_alloc(pes->total_size +
1135 FF_INPUT_BUFFER_PADDING_SIZE);
1137 return AVERROR(ENOMEM);
1139 } else if (pes->data_index == 0 &&
1140 buf_size > pes->total_size) {
1141 // pes packet size is < ts size packet and pes data is padded with 0xff
1142 // not sure if this is legal in ts but see issue #2392
1143 buf_size = pes->total_size;
1145 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1146 pes->data_index += buf_size;
1147 /* emit complete packets with known packet size
1148 * decreases demuxer delay for infrequent packets like subtitles from
1149 * a couple of seconds to milliseconds for properly muxed files.
1150 * total_size is the number of bytes following pes_packet_length
1151 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1152 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1153 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1155 new_pes_packet(pes, ts->pkt);
1169 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1174 /* if no pid found, then add a pid context */
1175 pes = av_mallocz(sizeof(PESContext));
1179 pes->stream = ts->stream;
1181 pes->pcr_pid = pcr_pid;
1182 pes->state = MPEGTS_SKIP;
1183 pes->pts = AV_NOPTS_VALUE;
1184 pes->dts = AV_NOPTS_VALUE;
1185 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1198 Mp4Descr *active_descr;
1200 int max_descr_count;
1202 int predefined_SLConfigDescriptor_seen;
1203 } MP4DescrParseContext;
1205 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1206 const uint8_t *buf, unsigned size,
1207 Mp4Descr *descr, int max_descr_count)
1210 if (size > (1 << 30))
1211 return AVERROR_INVALIDDATA;
1213 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1214 NULL, NULL, NULL, NULL)) < 0)
1221 d->active_descr = NULL;
1222 d->max_descr_count = max_descr_count;
1227 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1229 int64_t new_off = avio_tell(pb);
1230 (*len) -= new_off - *off;
1234 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1237 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1240 int ret = parse_mp4_descr(d, off, len, 0);
1243 update_offsets(&d->pb, &off, &len);
1248 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1250 avio_rb16(&d->pb); // ID
1256 update_offsets(&d->pb, &off, &len);
1257 return parse_mp4_descr_arr(d, off, len);
1260 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1265 id_flags = avio_rb16(&d->pb);
1266 if (!(id_flags & 0x0020)) { // URL_Flag
1267 update_offsets(&d->pb, &off, &len);
1268 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1274 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1277 if (d->descr_count >= d->max_descr_count)
1278 return AVERROR_INVALIDDATA;
1279 ff_mp4_parse_es_descr(&d->pb, &es_id);
1280 d->active_descr = d->descr + (d->descr_count++);
1282 d->active_descr->es_id = es_id;
1283 update_offsets(&d->pb, &off, &len);
1284 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1285 update_offsets(&d->pb, &off, &len);
1287 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1288 d->active_descr = NULL;
1292 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1295 Mp4Descr *descr = d->active_descr;
1297 return AVERROR_INVALIDDATA;
1298 d->active_descr->dec_config_descr = av_malloc(len);
1299 if (!descr->dec_config_descr)
1300 return AVERROR(ENOMEM);
1301 descr->dec_config_descr_len = len;
1302 avio_read(&d->pb, descr->dec_config_descr, len);
1306 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1308 Mp4Descr *descr = d->active_descr;
1311 return AVERROR_INVALIDDATA;
1313 predefined = avio_r8(&d->pb);
1316 int flags = avio_r8(&d->pb);
1317 descr->sl.use_au_start = !!(flags & 0x80);
1318 descr->sl.use_au_end = !!(flags & 0x40);
1319 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1320 descr->sl.use_padding = !!(flags & 0x08);
1321 descr->sl.use_timestamps = !!(flags & 0x04);
1322 descr->sl.use_idle = !!(flags & 0x02);
1323 descr->sl.timestamp_res = avio_rb32(&d->pb);
1325 descr->sl.timestamp_len = avio_r8(&d->pb);
1326 if (descr->sl.timestamp_len > 64) {
1327 avpriv_request_sample(NULL, "timestamp_len > 64");
1328 descr->sl.timestamp_len = 64;
1329 return AVERROR_PATCHWELCOME;
1331 descr->sl.ocr_len = avio_r8(&d->pb);
1332 descr->sl.au_len = avio_r8(&d->pb);
1333 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1334 lengths = avio_rb16(&d->pb);
1335 descr->sl.degr_prior_len = lengths >> 12;
1336 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1337 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1338 } else if (!d->predefined_SLConfigDescriptor_seen){
1339 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1340 d->predefined_SLConfigDescriptor_seen = 1;
1345 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1349 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1350 update_offsets(&d->pb, &off, &len);
1351 if (len < 0 || len1 > len || len1 <= 0) {
1352 av_log(d->s, AV_LOG_ERROR,
1353 "Tag %x length violation new length %d bytes remaining %d\n",
1355 return AVERROR_INVALIDDATA;
1358 if (d->level++ >= MAX_LEVEL) {
1359 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1363 if (target_tag && tag != target_tag) {
1364 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1371 parse_MP4IODescrTag(d, off, len1);
1374 parse_MP4ODescrTag(d, off, len1);
1377 parse_MP4ESDescrTag(d, off, len1);
1379 case MP4DecConfigDescrTag:
1380 parse_MP4DecConfigDescrTag(d, off, len1);
1383 parse_MP4SLDescrTag(d, off, len1);
1390 avio_seek(&d->pb, off + len1, SEEK_SET);
1394 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1395 Mp4Descr *descr, int *descr_count, int max_descr_count)
1397 MP4DescrParseContext d;
1400 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1404 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1406 *descr_count = d.descr_count;
1410 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1411 Mp4Descr *descr, int *descr_count, int max_descr_count)
1413 MP4DescrParseContext d;
1416 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1420 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1422 *descr_count = d.descr_count;
1426 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1429 MpegTSContext *ts = filter->u.section_filter.opaque;
1431 const uint8_t *p, *p_end;
1433 int mp4_descr_count = 0;
1434 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1436 AVFormatContext *s = ts->stream;
1438 p_end = section + section_len - 4;
1440 if (parse_section_header(&h, &p, p_end) < 0)
1442 if (h.tid != M4OD_TID)
1445 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1446 MAX_MP4_DESCR_COUNT);
1448 for (pid = 0; pid < NB_PID_MAX; pid++) {
1451 for (i = 0; i < mp4_descr_count; i++) {
1454 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1456 if (ts->pids[pid]->type != MPEGTS_PES) {
1457 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1460 pes = ts->pids[pid]->u.pes_filter.opaque;
1465 pes->sl = mp4_descr[i].sl;
1467 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1468 mp4_descr[i].dec_config_descr_len, 0,
1469 NULL, NULL, NULL, NULL);
1470 ff_mp4_read_dec_config_descr(s, st, &pb);
1471 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1472 st->codec->extradata_size > 0)
1473 st->need_parsing = 0;
1474 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1475 st->codec->extradata_size > 0)
1476 st->need_parsing = 0;
1478 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1480 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1481 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1482 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1483 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1484 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1485 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1488 for (i = 0; i < mp4_descr_count; i++)
1489 av_free(mp4_descr[i].dec_config_descr);
1492 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1493 const uint8_t **pp, const uint8_t *desc_list_end,
1494 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1497 const uint8_t *desc_end;
1498 int desc_len, desc_tag, desc_es_id;
1502 desc_tag = get8(pp, desc_list_end);
1504 return AVERROR_INVALIDDATA;
1505 desc_len = get8(pp, desc_list_end);
1507 return AVERROR_INVALIDDATA;
1508 desc_end = *pp + desc_len;
1509 if (desc_end > desc_list_end)
1510 return AVERROR_INVALIDDATA;
1512 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1514 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1515 stream_type == STREAM_TYPE_PRIVATE_DATA)
1516 mpegts_find_stream_type(st, desc_tag, DESC_types);
1519 case 0x1E: /* SL descriptor */
1520 desc_es_id = get16(pp, desc_end);
1521 if (ts && ts->pids[pid])
1522 ts->pids[pid]->es_id = desc_es_id;
1523 for (i = 0; i < mp4_descr_count; i++)
1524 if (mp4_descr[i].dec_config_descr_len &&
1525 mp4_descr[i].es_id == desc_es_id) {
1527 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1528 mp4_descr[i].dec_config_descr_len, 0,
1529 NULL, NULL, NULL, NULL);
1530 ff_mp4_read_dec_config_descr(fc, st, &pb);
1531 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1532 st->codec->extradata_size > 0)
1533 st->need_parsing = 0;
1534 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1535 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1538 case 0x1F: /* FMC descriptor */
1539 get16(pp, desc_end);
1540 if (mp4_descr_count > 0 &&
1541 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1542 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1544 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1545 mp4_descr->dec_config_descr_len, 0,
1546 NULL, NULL, NULL, NULL);
1547 ff_mp4_read_dec_config_descr(fc, st, &pb);
1548 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1549 st->codec->extradata_size > 0) {
1550 st->request_probe = st->need_parsing = 0;
1551 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1555 case 0x56: /* DVB teletext descriptor */
1557 uint8_t *extradata = NULL;
1558 int language_count = desc_len / 5;
1560 if (desc_len > 0 && desc_len % 5 != 0)
1561 return AVERROR_INVALIDDATA;
1563 if (language_count > 0) {
1564 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1565 if (language_count > sizeof(language) / 4) {
1566 language_count = sizeof(language) / 4;
1569 if (st->codec->extradata == NULL) {
1570 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1571 return AVERROR(ENOMEM);
1575 if (st->codec->extradata_size < language_count * 2)
1576 return AVERROR_INVALIDDATA;
1578 extradata = st->codec->extradata;
1580 for (i = 0; i < language_count; i++) {
1581 language[i * 4 + 0] = get8(pp, desc_end);
1582 language[i * 4 + 1] = get8(pp, desc_end);
1583 language[i * 4 + 2] = get8(pp, desc_end);
1584 language[i * 4 + 3] = ',';
1586 memcpy(extradata, *pp, 2);
1592 language[i * 4 - 1] = 0;
1593 av_dict_set(&st->metadata, "language", language, 0);
1597 case 0x59: /* subtitling descriptor */
1599 /* 8 bytes per DVB subtitle substream data:
1600 * ISO_639_language_code (3 bytes),
1601 * subtitling_type (1 byte),
1602 * composition_page_id (2 bytes),
1603 * ancillary_page_id (2 bytes) */
1604 int language_count = desc_len / 8;
1606 if (desc_len > 0 && desc_len % 8 != 0)
1607 return AVERROR_INVALIDDATA;
1609 if (language_count > 1) {
1610 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1613 if (language_count > 0) {
1616 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1617 if (language_count > sizeof(language) / 4) {
1618 language_count = sizeof(language) / 4;
1621 if (st->codec->extradata == NULL) {
1622 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1623 return AVERROR(ENOMEM);
1627 if (st->codec->extradata_size < language_count * 5)
1628 return AVERROR_INVALIDDATA;
1630 extradata = st->codec->extradata;
1632 for (i = 0; i < language_count; i++) {
1633 language[i * 4 + 0] = get8(pp, desc_end);
1634 language[i * 4 + 1] = get8(pp, desc_end);
1635 language[i * 4 + 2] = get8(pp, desc_end);
1636 language[i * 4 + 3] = ',';
1638 /* hearing impaired subtitles detection using subtitling_type */
1640 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1641 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1642 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1643 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1644 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1645 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1646 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1650 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1651 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1657 language[i * 4 - 1] = 0;
1658 av_dict_set(&st->metadata, "language", language, 0);
1662 case 0x0a: /* ISO 639 language descriptor */
1663 for (i = 0; i + 4 <= desc_len; i += 4) {
1664 language[i + 0] = get8(pp, desc_end);
1665 language[i + 1] = get8(pp, desc_end);
1666 language[i + 2] = get8(pp, desc_end);
1667 language[i + 3] = ',';
1668 switch (get8(pp, desc_end)) {
1670 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1673 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1676 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1680 if (i && language[0]) {
1681 language[i - 1] = 0;
1682 av_dict_set(&st->metadata, "language", language, 0);
1685 case 0x05: /* registration descriptor */
1686 st->codec->codec_tag = bytestream_get_le32(pp);
1687 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1688 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1689 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1691 case 0x52: /* stream identifier descriptor */
1692 st->stream_identifier = 1 + get8(pp, desc_end);
1694 case 0x26: /* metadata descriptor */
1695 if (get16(pp, desc_end) == 0xFFFF)
1697 if (get8(pp, desc_end) == 0xFF) {
1698 st->codec->codec_tag = bytestream_get_le32(pp);
1699 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1700 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1710 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1712 MpegTSContext *ts = filter->u.section_filter.opaque;
1713 SectionHeader h1, *h = &h1;
1716 const uint8_t *p, *p_end, *desc_list_end;
1717 int program_info_length, pcr_pid, pid, stream_type;
1719 uint32_t prog_reg_desc = 0; /* registration descriptor */
1721 int mp4_descr_count = 0;
1722 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1725 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1726 hex_dump_debug(ts->stream, section, section_len);
1728 p_end = section + section_len - 4;
1730 if (parse_section_header(h, &p, p_end) < 0)
1733 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1734 h->id, h->sec_num, h->last_sec_num);
1736 if (h->tid != PMT_TID)
1738 if (ts->skip_changes)
1741 clear_program(ts, h->id);
1742 pcr_pid = get16(&p, p_end);
1746 add_pid_to_pmt(ts, h->id, pcr_pid);
1747 set_pcr_pid(ts->stream, h->id, pcr_pid);
1749 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1751 program_info_length = get16(&p, p_end);
1752 if (program_info_length < 0)
1754 program_info_length &= 0xfff;
1755 while (program_info_length >= 2) {
1757 tag = get8(&p, p_end);
1758 len = get8(&p, p_end);
1760 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1762 if (len > program_info_length - 2)
1763 // something else is broken, exit the program_descriptors_loop
1765 program_info_length -= len + 2;
1766 if (tag == 0x1d) { // IOD descriptor
1767 get8(&p, p_end); // scope
1768 get8(&p, p_end); // label
1770 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1771 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1772 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1773 prog_reg_desc = bytestream_get_le32(&p);
1778 p += program_info_length;
1782 // stop parsing after pmt, we found header
1783 if (!ts->stream->nb_streams)
1786 set_pmt_found(ts, h->id);
1792 stream_type = get8(&p, p_end);
1793 if (stream_type < 0)
1795 pid = get16(&p, p_end);
1799 if (pid == ts->current_pid)
1802 /* now create stream */
1803 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1804 pes = ts->pids[pid]->u.pes_filter.opaque;
1806 pes->st = avformat_new_stream(pes->stream, NULL);
1809 pes->st->id = pes->pid;
1812 } else if (stream_type != 0x13) {
1814 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1815 pes = add_pes_stream(ts, pid, pcr_pid);
1817 st = avformat_new_stream(pes->stream, NULL);
1823 int idx = ff_find_stream_index(ts->stream, pid);
1825 st = ts->stream->streams[idx];
1827 st = avformat_new_stream(ts->stream, NULL);
1831 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1838 if (pes && !pes->stream_type)
1839 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1841 add_pid_to_pmt(ts, h->id, pid);
1843 ff_program_add_stream_index(ts->stream, h->id, st->index);
1845 desc_list_len = get16(&p, p_end);
1846 if (desc_list_len < 0)
1848 desc_list_len &= 0xfff;
1849 desc_list_end = p + desc_list_len;
1850 if (desc_list_end > p_end)
1853 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1854 desc_list_end, mp4_descr,
1855 mp4_descr_count, pid, ts) < 0)
1858 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1859 stream_type == 0x83 && pes->sub_st) {
1860 ff_program_add_stream_index(ts->stream, h->id,
1861 pes->sub_st->index);
1862 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1868 if (!ts->pids[pcr_pid])
1869 mpegts_open_pcr_filter(ts, pcr_pid);
1872 for (i = 0; i < mp4_descr_count; i++)
1873 av_free(mp4_descr[i].dec_config_descr);
1876 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1878 MpegTSContext *ts = filter->u.section_filter.opaque;
1879 SectionHeader h1, *h = &h1;
1880 const uint8_t *p, *p_end;
1884 av_dlog(ts->stream, "PAT:\n");
1885 hex_dump_debug(ts->stream, section, section_len);
1887 p_end = section + section_len - 4;
1889 if (parse_section_header(h, &p, p_end) < 0)
1891 if (h->tid != PAT_TID)
1893 if (ts->skip_changes)
1896 ts->stream->ts_id = h->id;
1900 sid = get16(&p, p_end);
1903 pmt_pid = get16(&p, p_end);
1908 if (pmt_pid == ts->current_pid)
1911 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1913 if (sid == 0x0000) {
1916 MpegTSFilter *fil = ts->pids[pmt_pid];
1917 program = av_new_program(ts->stream, sid);
1918 program->program_num = sid;
1919 program->pmt_pid = pmt_pid;
1921 if ( fil->type != MPEGTS_SECTION
1922 || fil->pid != pmt_pid
1923 || fil->u.section_filter.section_cb != pmt_cb)
1924 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1926 if (!ts->pids[pmt_pid])
1927 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1928 add_pat_entry(ts, sid);
1929 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1930 add_pid_to_pmt(ts, sid, pmt_pid);
1936 for (j=0; j<ts->stream->nb_programs; j++) {
1937 for (i = 0; i < ts->nb_prg; i++)
1938 if (ts->prg[i].id == ts->stream->programs[j]->id)
1940 if (i==ts->nb_prg && !ts->skip_clear)
1941 clear_avprogram(ts, ts->stream->programs[j]->id);
1946 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1948 MpegTSContext *ts = filter->u.section_filter.opaque;
1949 SectionHeader h1, *h = &h1;
1950 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1951 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1952 char *name, *provider_name;
1954 av_dlog(ts->stream, "SDT:\n");
1955 hex_dump_debug(ts->stream, section, section_len);
1957 p_end = section + section_len - 4;
1959 if (parse_section_header(h, &p, p_end) < 0)
1961 if (h->tid != SDT_TID)
1963 if (ts->skip_changes)
1965 onid = get16(&p, p_end);
1968 val = get8(&p, p_end);
1972 sid = get16(&p, p_end);
1975 val = get8(&p, p_end);
1978 desc_list_len = get16(&p, p_end);
1979 if (desc_list_len < 0)
1981 desc_list_len &= 0xfff;
1982 desc_list_end = p + desc_list_len;
1983 if (desc_list_end > p_end)
1986 desc_tag = get8(&p, desc_list_end);
1989 desc_len = get8(&p, desc_list_end);
1990 desc_end = p + desc_len;
1991 if (desc_end > desc_list_end)
1994 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1995 desc_tag, desc_len);
1999 service_type = get8(&p, p_end);
2000 if (service_type < 0)
2002 provider_name = getstr8(&p, p_end);
2005 name = getstr8(&p, p_end);
2007 AVProgram *program = av_new_program(ts->stream, sid);
2009 av_dict_set(&program->metadata, "service_name", name, 0);
2010 av_dict_set(&program->metadata, "service_provider",
2015 av_free(provider_name);
2026 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2027 const uint8_t *packet);
2029 /* handle one TS packet */
2030 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2033 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2034 has_adaptation, has_payload;
2035 const uint8_t *p, *p_end;
2038 pid = AV_RB16(packet + 1) & 0x1fff;
2039 if (pid && discard_pid(ts, pid))
2041 is_start = packet[1] & 0x40;
2042 tss = ts->pids[pid];
2043 if (ts->auto_guess && !tss && is_start) {
2044 add_pes_stream(ts, pid, -1);
2045 tss = ts->pids[pid];
2049 ts->current_pid = pid;
2051 afc = (packet[3] >> 4) & 3;
2052 if (afc == 0) /* reserved value */
2054 has_adaptation = afc & 2;
2055 has_payload = afc & 1;
2056 is_discontinuity = has_adaptation &&
2057 packet[4] != 0 && /* with length > 0 */
2058 (packet[5] & 0x80); /* and discontinuity indicated */
2060 /* continuity check (currently not used) */
2061 cc = (packet[3] & 0xf);
2062 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2063 cc_ok = pid == 0x1FFF || // null packet PID
2070 av_log(ts->stream, AV_LOG_DEBUG,
2071 "Continuity check failed for pid %d expected %d got %d\n",
2072 pid, expected_cc, cc);
2073 if (tss->type == MPEGTS_PES) {
2074 PESContext *pc = tss->u.pes_filter.opaque;
2075 pc->flags |= AV_PKT_FLAG_CORRUPT;
2080 if (has_adaptation) {
2083 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2084 tss->last_pcr = pcr_h * 300 + pcr_l;
2085 /* skip adaptation field */
2088 /* if past the end of packet, ignore */
2089 p_end = packet + TS_PACKET_SIZE;
2090 if (p >= p_end || !has_payload)
2093 pos = avio_tell(ts->stream->pb);
2095 av_assert0(pos >= TS_PACKET_SIZE);
2096 ts->pos47_full = pos - TS_PACKET_SIZE;
2099 if (tss->type == MPEGTS_SECTION) {
2101 /* pointer field present */
2103 if (p + len > p_end)
2106 /* write remaining section bytes */
2107 write_section_data(ts, tss,
2109 /* check whether filter has been closed */
2115 write_section_data(ts, tss,
2120 write_section_data(ts, tss,
2125 // stop find_stream_info from waiting for more streams
2126 // when all programs have received a PMT
2127 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2129 for (i = 0; i < ts->nb_prg; i++) {
2130 if (!ts->prg[i].pmt_found)
2133 if (i == ts->nb_prg && ts->nb_prg > 0) {
2134 if (ts->stream->nb_streams > 1 || pos > 100000) {
2135 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2136 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2143 // Note: The position here points actually behind the current packet.
2144 if (tss->type == MPEGTS_PES) {
2145 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2146 pos - ts->raw_packet_size)) < 0)
2154 static void reanalyze(MpegTSContext *ts) {
2155 AVIOContext *pb = ts->stream->pb;
2156 int64_t pos = avio_tell(pb);
2159 pos -= ts->pos47_full;
2160 if (pos == TS_PACKET_SIZE) {
2161 ts->size_stat[0] ++;
2162 } else if (pos == TS_DVHS_PACKET_SIZE) {
2163 ts->size_stat[1] ++;
2164 } else if (pos == TS_FEC_PACKET_SIZE) {
2165 ts->size_stat[2] ++;
2168 ts->size_stat_count ++;
2169 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2171 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2172 newsize = TS_PACKET_SIZE;
2173 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2174 newsize = TS_DVHS_PACKET_SIZE;
2175 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2176 newsize = TS_FEC_PACKET_SIZE;
2178 if (newsize && newsize != ts->raw_packet_size) {
2179 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2180 ts->raw_packet_size = newsize;
2182 ts->size_stat_count = 0;
2183 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2187 /* XXX: try to find a better synchro over several packets (use
2188 * get_packet_size() ?) */
2189 static int mpegts_resync(AVFormatContext *s)
2191 AVIOContext *pb = s->pb;
2194 for (i = 0; i < MAX_RESYNC_SIZE; i++) {
2199 avio_seek(pb, -1, SEEK_CUR);
2200 reanalyze(s->priv_data);
2204 av_log(s, AV_LOG_ERROR,
2205 "max resync size reached, could not find sync byte\n");
2207 return AVERROR_INVALIDDATA;
2210 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2211 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2212 const uint8_t **data)
2214 AVIOContext *pb = s->pb;
2218 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2219 if (len != TS_PACKET_SIZE)
2220 return len < 0 ? len : AVERROR_EOF;
2221 /* check packet sync byte */
2222 if ((*data)[0] != 0x47) {
2223 /* find a new packet start */
2224 uint64_t pos = avio_tell(pb);
2225 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2227 if (mpegts_resync(s) < 0)
2228 return AVERROR(EAGAIN);
2238 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2240 AVIOContext *pb = s->pb;
2241 int skip = raw_packet_size - TS_PACKET_SIZE;
2243 avio_skip(pb, skip);
2246 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2248 AVFormatContext *s = ts->stream;
2249 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2250 const uint8_t *data;
2254 if (avio_tell(s->pb) != ts->last_pos) {
2256 av_dlog(ts->stream, "Skipping after seek\n");
2257 /* seek detected, flush pes buffer */
2258 for (i = 0; i < NB_PID_MAX; i++) {
2260 if (ts->pids[i]->type == MPEGTS_PES) {
2261 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2262 av_buffer_unref(&pes->buffer);
2263 pes->data_index = 0;
2264 pes->state = MPEGTS_SKIP; /* skip until pes header */
2266 ts->pids[i]->last_cc = -1;
2267 ts->pids[i]->last_pcr = -1;
2274 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2277 if (nb_packets != 0 && packet_num >= nb_packets ||
2278 ts->stop_parse > 1) {
2279 ret = AVERROR(EAGAIN);
2282 if (ts->stop_parse > 0)
2285 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2288 ret = handle_packet(ts, data);
2289 finished_reading_packet(s, ts->raw_packet_size);
2293 ts->last_pos = avio_tell(s->pb);
2297 static int mpegts_probe(AVProbeData *p)
2299 const int size = p->buf_size;
2303 int check_count = size / TS_FEC_PACKET_SIZE;
2304 #define CHECK_COUNT 10
2305 #define CHECK_BLOCK 100
2307 if (check_count < CHECK_COUNT)
2308 return AVERROR_INVALIDDATA;
2310 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2311 int left = FFMIN(check_count - i, CHECK_BLOCK);
2312 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2313 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2314 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2315 score = FFMAX3(score, dvhs_score, fec_score);
2317 maxscore = FFMAX(maxscore, score);
2320 sumscore = sumscore * CHECK_COUNT / check_count;
2321 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2323 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2325 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2326 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2328 return AVERROR_INVALIDDATA;
2331 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2332 * (-1) if not available */
2333 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2335 int afc, len, flags;
2339 afc = (packet[3] >> 4) & 3;
2341 return AVERROR_INVALIDDATA;
2346 return AVERROR_INVALIDDATA;
2349 if (!(flags & 0x10))
2350 return AVERROR_INVALIDDATA;
2352 return AVERROR_INVALIDDATA;
2354 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2355 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2359 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2361 /* NOTE: We attempt to seek on non-seekable files as well, as the
2362 * probe buffer usually is big enough. Only warn if the seek failed
2363 * on files where the seek should work. */
2364 if (avio_seek(pb, pos, SEEK_SET) < 0)
2365 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2368 static int mpegts_read_header(AVFormatContext *s)
2370 MpegTSContext *ts = s->priv_data;
2371 AVIOContext *pb = s->pb;
2372 uint8_t buf[8 * 1024] = {0};
2374 int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2376 ffio_ensure_seekback(pb, probesize);
2378 /* read the first 8192 bytes to get packet size */
2379 pos = avio_tell(pb);
2380 len = avio_read(pb, buf, sizeof(buf));
2381 ts->raw_packet_size = get_packet_size(buf, len);
2382 if (ts->raw_packet_size <= 0) {
2383 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2384 ts->raw_packet_size = TS_PACKET_SIZE;
2389 if (s->iformat == &ff_mpegts_demuxer) {
2392 /* first do a scan to get all the services */
2393 seek_back(s, pb, pos);
2395 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2397 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2399 handle_packets(ts, probesize / ts->raw_packet_size);
2400 /* if could not find service, enable auto_guess */
2404 av_dlog(ts->stream, "tuning done\n");
2406 s->ctx_flags |= AVFMTCTX_NOHEADER;
2409 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2410 int64_t pcrs[2], pcr_h;
2411 int packet_count[2];
2412 uint8_t packet[TS_PACKET_SIZE];
2413 const uint8_t *data;
2415 /* only read packets */
2417 st = avformat_new_stream(s, NULL);
2419 return AVERROR(ENOMEM);
2420 avpriv_set_pts_info(st, 60, 1, 27000000);
2421 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2422 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2424 /* we iterate until we find two PCRs to estimate the bitrate */
2429 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2432 pid = AV_RB16(data + 1) & 0x1fff;
2433 if ((pcr_pid == -1 || pcr_pid == pid) &&
2434 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2435 finished_reading_packet(s, ts->raw_packet_size);
2437 packet_count[nb_pcrs] = nb_packets;
2438 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2443 finished_reading_packet(s, ts->raw_packet_size);
2448 /* NOTE1: the bitrate is computed without the FEC */
2449 /* NOTE2: it is only the bitrate of the start of the stream */
2450 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2451 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2452 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2453 st->codec->bit_rate = s->bit_rate;
2454 st->start_time = ts->cur_pcr;
2455 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2456 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2459 seek_back(s, pb, pos);
2463 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2465 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2467 MpegTSContext *ts = s->priv_data;
2469 int64_t pcr_h, next_pcr_h, pos;
2470 int pcr_l, next_pcr_l;
2471 uint8_t pcr_buf[12];
2472 const uint8_t *data;
2474 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2475 return AVERROR(ENOMEM);
2476 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2477 pkt->pos = avio_tell(s->pb);
2479 av_free_packet(pkt);
2482 if (data != pkt->data)
2483 memcpy(pkt->data, data, ts->raw_packet_size);
2484 finished_reading_packet(s, ts->raw_packet_size);
2485 if (ts->mpeg2ts_compute_pcr) {
2486 /* compute exact PCR for each packet */
2487 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2488 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2489 pos = avio_tell(s->pb);
2490 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2491 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2492 avio_read(s->pb, pcr_buf, 12);
2493 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2494 /* XXX: not precise enough */
2496 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2501 avio_seek(s->pb, pos, SEEK_SET);
2502 /* no next PCR found: we use previous increment */
2503 ts->cur_pcr = pcr_h * 300 + pcr_l;
2505 pkt->pts = ts->cur_pcr;
2506 pkt->duration = ts->pcr_incr;
2507 ts->cur_pcr += ts->pcr_incr;
2509 pkt->stream_index = 0;
2513 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2515 MpegTSContext *ts = s->priv_data;
2520 ret = handle_packets(ts, 0);
2522 av_free_packet(ts->pkt);
2523 /* flush pes data left */
2524 for (i = 0; i < NB_PID_MAX; i++)
2525 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2526 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2527 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2528 new_pes_packet(pes, pkt);
2529 pes->state = MPEGTS_SKIP;
2536 if (!ret && pkt->size < 0)
2537 ret = AVERROR(EINTR);
2541 static void mpegts_free(MpegTSContext *ts)
2547 for (i = 0; i < NB_PID_MAX; i++)
2549 mpegts_close_filter(ts, ts->pids[i]);
2552 static int mpegts_read_close(AVFormatContext *s)
2554 MpegTSContext *ts = s->priv_data;
2559 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2560 int64_t *ppos, int64_t pos_limit)
2562 MpegTSContext *ts = s->priv_data;
2563 int64_t pos, timestamp;
2564 uint8_t buf[TS_PACKET_SIZE];
2565 int pcr_l, pcr_pid =
2566 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2567 int pos47 = ts->pos47_full % ts->raw_packet_size;
2569 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2570 ts->raw_packet_size + pos47;
2571 while(pos < pos_limit) {
2572 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2573 return AV_NOPTS_VALUE;
2574 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2575 return AV_NOPTS_VALUE;
2576 if (buf[0] != 0x47) {
2577 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2578 if (mpegts_resync(s) < 0)
2579 return AV_NOPTS_VALUE;
2580 pos = avio_tell(s->pb);
2583 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2584 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2588 pos += ts->raw_packet_size;
2591 return AV_NOPTS_VALUE;
2594 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2595 int64_t *ppos, int64_t pos_limit)
2597 MpegTSContext *ts = s->priv_data;
2599 int pos47 = ts->pos47_full % ts->raw_packet_size;
2600 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2601 ff_read_frame_flush(s);
2602 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2603 return AV_NOPTS_VALUE;
2604 while(pos < pos_limit) {
2607 av_init_packet(&pkt);
2608 ret = av_read_frame(s, &pkt);
2610 return AV_NOPTS_VALUE;
2611 av_free_packet(&pkt);
2612 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2613 ff_reduce_index(s, pkt.stream_index);
2614 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2615 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2623 return AV_NOPTS_VALUE;
2626 /**************************************************************/
2627 /* parsing functions - called from other demuxers such as RTP */
2629 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
2633 ts = av_mallocz(sizeof(MpegTSContext));
2636 /* no stream case, currently used by RTP */
2637 ts->raw_packet_size = TS_PACKET_SIZE;
2640 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2641 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2646 /* return the consumed length if a packet was output, or -1 if no
2647 * packet is output */
2648 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2649 const uint8_t *buf, int len)
2657 if (len < TS_PACKET_SIZE)
2658 return AVERROR_INVALIDDATA;
2659 if (buf[0] != 0x47) {
2663 handle_packet(ts, buf);
2664 buf += TS_PACKET_SIZE;
2665 len -= TS_PACKET_SIZE;
2666 if (ts->stop_parse == 1)
2673 void avpriv_mpegts_parse_close(MpegTSContext *ts)
2679 AVInputFormat ff_mpegts_demuxer = {
2681 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2682 .priv_data_size = sizeof(MpegTSContext),
2683 .read_probe = mpegts_probe,
2684 .read_header = mpegts_read_header,
2685 .read_packet = mpegts_read_packet,
2686 .read_close = mpegts_read_close,
2687 .read_timestamp = mpegts_get_dts,
2688 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2689 .priv_class = &mpegts_class,
2692 AVInputFormat ff_mpegtsraw_demuxer = {
2693 .name = "mpegtsraw",
2694 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2695 .priv_data_size = sizeof(MpegTSContext),
2696 .read_header = mpegts_read_header,
2697 .read_packet = mpegts_raw_read_packet,
2698 .read_close = mpegts_read_close,
2699 .read_timestamp = mpegts_get_dts,
2700 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2701 .priv_class = &mpegtsraw_class,