2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avassert.h"
30 #include "libavcodec/bytestream.h"
31 #include "libavcodec/get_bits.h"
35 #include "avio_internal.h"
40 /* maximum size in which we look for synchronisation if
41 * synchronisation is lost */
42 #define MAX_RESYNC_SIZE 65536
44 #define MAX_PES_PAYLOAD 200 * 1024
46 #define MAX_MP4_DESCR_COUNT 16
48 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
50 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
51 (modulus) = (dividend) % (divisor); \
52 (prev_dividend) = (dividend); \
55 enum MpegTSFilterType {
61 typedef struct MpegTSFilter MpegTSFilter;
63 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
64 int is_start, int64_t pos);
66 typedef struct MpegTSPESFilter {
71 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
73 typedef void SetServiceCallback (void *opaque, int ret);
75 typedef struct MpegTSSectionFilter {
79 unsigned int check_crc : 1;
80 unsigned int end_of_section_reached : 1;
81 SectionCallback *section_cb;
83 } MpegTSSectionFilter;
88 int last_cc; /* last cc code (-1 if first packet) */
90 enum MpegTSFilterType type;
92 MpegTSPESFilter pes_filter;
93 MpegTSSectionFilter section_filter;
97 #define MAX_PIDS_PER_PROGRAM 64
99 unsigned int id; // program id/service id
100 unsigned int nb_pids;
101 unsigned int pids[MAX_PIDS_PER_PROGRAM];
103 /** have we found pmt for this program */
107 struct MpegTSContext {
108 const AVClass *class;
110 AVFormatContext *stream;
111 /** raw packet size, including FEC if present */
116 #define SIZE_STAT_THRESHOLD 10
120 /** if true, all pids are analyzed to find streams */
123 /** compute exact PCR for each transport stream packet */
124 int mpeg2ts_compute_pcr;
126 /** fix dvb teletext pts */
127 int fix_teletext_pts;
129 int64_t cur_pcr; /**< used to estimate the exact PCR */
130 int pcr_incr; /**< used to estimate the exact PCR */
132 /* data needed to handle file based ts */
133 /** stop parsing loop */
135 /** packet containing Audio/Video data */
137 /** to detect seek */
140 /******************************************/
141 /* private mpegts data */
143 /** structure to keep track of Program->pids mapping */
147 int8_t crc_validity[NB_PID_MAX];
148 /** filters for various streams specified by PMT + for the PAT and PMT */
149 MpegTSFilter *pids[NB_PID_MAX];
153 static const AVOption mpegtsraw_options[] = {
154 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
155 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
156 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
157 { "ts_packetsize", "Output option carrying the raw packet size.",
158 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
160 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
164 static const AVClass mpegtsraw_class = {
165 .class_name = "mpegtsraw demuxer",
166 .item_name = av_default_item_name,
167 .option = mpegtsraw_options,
168 .version = LIBAVUTIL_VERSION_INT,
171 static const AVOption mpegts_options[] = {
172 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
173 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
174 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
175 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
179 static const AVClass mpegts_class = {
180 .class_name = "mpegts demuxer",
181 .item_name = av_default_item_name,
182 .option = mpegts_options,
183 .version = LIBAVUTIL_VERSION_INT,
186 /* TS stream handling */
191 MPEGTS_PESHEADER_FILL,
196 /* enough for PES header + length */
197 #define PES_START_SIZE 6
198 #define PES_HEADER_SIZE 9
199 #define MAX_PES_HEADER_SIZE (9 + 255)
201 typedef struct PESContext {
203 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
206 AVFormatContext *stream;
208 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
209 enum MpegTSState state;
210 /* used to get the format */
212 int flags; /**< copied to the AVPacket flags */
215 int extended_stream_id;
217 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
218 uint8_t header[MAX_PES_HEADER_SIZE];
223 extern AVInputFormat ff_mpegts_demuxer;
225 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
228 for (i = 0; i < ts->nb_prg; i++) {
229 if (ts->prg[i].id == programid) {
236 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
238 AVProgram *prg = NULL;
240 for (i = 0; i < ts->stream->nb_programs; i++)
241 if (ts->stream->programs[i]->id == programid) {
242 prg = ts->stream->programs[i];
247 prg->nb_stream_indexes = 0;
250 static void clear_program(MpegTSContext *ts, unsigned int programid)
254 clear_avprogram(ts, programid);
255 for (i = 0; i < ts->nb_prg; i++)
256 if (ts->prg[i].id == programid) {
257 ts->prg[i].nb_pids = 0;
258 ts->prg[i].pmt_found = 0;
262 static void clear_programs(MpegTSContext *ts)
268 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
271 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
275 p = &ts->prg[ts->nb_prg];
282 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
285 struct Program *p = get_program(ts, programid);
289 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
291 p->pids[p->nb_pids++] = pid;
294 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
296 struct Program *p = get_program(ts, programid);
303 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
306 for (i = 0; i < s->nb_programs; i++) {
307 if (s->programs[i]->id == programid) {
308 s->programs[i]->pcr_pid = pid;
315 * @brief discard_pid() decides if the pid is to be discarded according
316 * to caller's programs selection
317 * @param ts : - TS context
319 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
322 static int discard_pid(MpegTSContext *ts, unsigned int pid)
325 int used = 0, discarded = 0;
328 /* If none of the programs have .discard=AVDISCARD_ALL then there's
329 * no way we have to discard this packet */
330 for (k = 0; k < ts->stream->nb_programs; k++)
331 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
333 if (k == ts->stream->nb_programs)
336 for (i = 0; i < ts->nb_prg; i++) {
338 for (j = 0; j < p->nb_pids; j++) {
339 if (p->pids[j] != pid)
341 // is program with id p->id set to be discarded?
342 for (k = 0; k < ts->stream->nb_programs; k++) {
343 if (ts->stream->programs[k]->id == p->id) {
344 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
353 return !used && discarded;
357 * Assemble PES packets out of TS packets, and then call the "section_cb"
358 * function when they are complete.
360 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
361 const uint8_t *buf, int buf_size, int is_start)
363 MpegTSContext *ts = s->priv_data;
364 MpegTSSectionFilter *tss = &tss1->u.section_filter;
368 memcpy(tss->section_buf, buf, buf_size);
369 tss->section_index = buf_size;
370 tss->section_h_size = -1;
371 tss->end_of_section_reached = 0;
373 if (tss->end_of_section_reached)
375 len = 4096 - tss->section_index;
378 memcpy(tss->section_buf + tss->section_index, buf, len);
379 tss->section_index += len;
382 /* compute section length if possible */
383 if (tss->section_h_size == -1 && tss->section_index >= 3) {
384 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
387 tss->section_h_size = len;
390 if (tss->section_h_size != -1 &&
391 tss->section_index >= tss->section_h_size) {
393 tss->end_of_section_reached = 1;
395 if (tss->check_crc) {
396 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
398 ts->crc_validity[ tss1->pid ] = 100;
399 }else if (ts->crc_validity[ tss1->pid ] > -10) {
400 ts->crc_validity[ tss1->pid ]--;
405 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
409 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
410 enum MpegTSFilterType type)
412 MpegTSFilter *filter;
414 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
416 if (pid >= NB_PID_MAX || ts->pids[pid])
418 filter = av_mallocz(sizeof(MpegTSFilter));
421 ts->pids[pid] = filter;
426 filter->last_cc = -1;
427 filter->last_pcr= -1;
432 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
434 SectionCallback *section_cb,
438 MpegTSFilter *filter;
439 MpegTSSectionFilter *sec;
441 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
443 sec = &filter->u.section_filter;
444 sec->section_cb = section_cb;
445 sec->opaque = opaque;
446 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
447 sec->check_crc = check_crc;
448 if (!sec->section_buf) {
455 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
459 MpegTSFilter *filter;
460 MpegTSPESFilter *pes;
462 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
465 pes = &filter->u.pes_filter;
466 pes->pes_cb = pes_cb;
467 pes->opaque = opaque;
471 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
473 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
476 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
481 if (filter->type == MPEGTS_SECTION)
482 av_freep(&filter->u.section_filter.section_buf);
483 else if (filter->type == MPEGTS_PES) {
484 PESContext *pes = filter->u.pes_filter.opaque;
485 av_buffer_unref(&pes->buffer);
486 /* referenced private data will be freed later in
487 * avformat_close_input */
488 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
489 av_freep(&filter->u.pes_filter.opaque);
494 ts->pids[pid] = NULL;
497 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
499 int stat[TS_MAX_PACKET_SIZE];
503 memset(stat, 0, packet_size * sizeof(*stat));
505 for (i = 0; i < size - 3; i++) {
506 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
507 int x = i % packet_size;
509 if (stat[x] > best_score) {
510 best_score = stat[x];
520 /* autodetect fec presence. Must have at least 1024 bytes */
521 static int get_packet_size(const uint8_t *buf, int size)
523 int score, fec_score, dvhs_score;
525 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
526 return AVERROR_INVALIDDATA;
528 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
529 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
530 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
531 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
532 score, dvhs_score, fec_score);
534 if (score > fec_score && score > dvhs_score)
535 return TS_PACKET_SIZE;
536 else if (dvhs_score > score && dvhs_score > fec_score)
537 return TS_DVHS_PACKET_SIZE;
538 else if (score < fec_score && dvhs_score < fec_score)
539 return TS_FEC_PACKET_SIZE;
541 return AVERROR_INVALIDDATA;
544 typedef struct SectionHeader {
549 uint8_t last_sec_num;
552 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
559 return AVERROR_INVALIDDATA;
565 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
571 if ((p + 1) >= p_end)
572 return AVERROR_INVALIDDATA;
579 /* read and allocate a DVB string preceded by its length */
580 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
587 len = get8(&p, p_end);
590 if ((p + len) > p_end)
592 str = av_malloc(len + 1);
602 static int parse_section_header(SectionHeader *h,
603 const uint8_t **pp, const uint8_t *p_end)
607 val = get8(pp, p_end);
612 val = get16(pp, p_end);
616 val = get8(pp, p_end);
619 h->version = (val >> 1) & 0x1f;
620 val = get8(pp, p_end);
624 val = get8(pp, p_end);
627 h->last_sec_num = val;
632 uint32_t stream_type;
633 enum AVMediaType codec_type;
634 enum AVCodecID codec_id;
637 static const StreamType ISO_types[] = {
638 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
639 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
640 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
641 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
642 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
643 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
644 /* Makito encoder sets stream type 0x11 for AAC,
645 * so auto-detect LOAS/LATM instead of hardcoding it. */
646 #if !CONFIG_LOAS_DEMUXER
647 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
649 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
650 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
651 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
652 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
653 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
657 static const StreamType HDMV_types[] = {
658 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
659 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
660 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
661 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
662 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
663 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
664 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
665 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
666 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
667 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
672 static const StreamType MISC_types[] = {
673 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
674 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
678 static const StreamType REGD_types[] = {
679 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
680 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
681 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
682 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
683 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
684 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
685 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
686 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
687 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
691 static const StreamType METADATA_types[] = {
692 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
693 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
697 /* descriptor present */
698 static const StreamType DESC_types[] = {
699 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
700 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
701 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
702 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
703 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
707 static void mpegts_find_stream_type(AVStream *st,
708 uint32_t stream_type,
709 const StreamType *types)
711 if (avcodec_is_open(st->codec)) {
712 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
716 for (; types->stream_type; types++)
717 if (stream_type == types->stream_type) {
718 st->codec->codec_type = types->codec_type;
719 st->codec->codec_id = types->codec_id;
720 st->request_probe = 0;
725 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
726 uint32_t stream_type, uint32_t prog_reg_desc)
728 int old_codec_type = st->codec->codec_type;
729 int old_codec_id = st->codec->codec_id;
731 if (avcodec_is_open(st->codec)) {
732 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
736 avpriv_set_pts_info(st, 33, 1, 90000);
738 st->codec->codec_type = AVMEDIA_TYPE_DATA;
739 st->codec->codec_id = AV_CODEC_ID_NONE;
740 st->need_parsing = AVSTREAM_PARSE_FULL;
742 pes->stream_type = stream_type;
744 av_log(pes->stream, AV_LOG_DEBUG,
745 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
746 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
748 st->codec->codec_tag = pes->stream_type;
750 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
751 if ((prog_reg_desc == AV_RL32("HDMV") ||
752 prog_reg_desc == AV_RL32("HDPR")) &&
753 st->codec->codec_id == AV_CODEC_ID_NONE) {
754 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
755 if (pes->stream_type == 0x83) {
756 // HDMV TrueHD streams also contain an AC3 coded version of the
757 // audio track - add a second stream for this
759 // priv_data cannot be shared between streams
760 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
762 return AVERROR(ENOMEM);
763 memcpy(sub_pes, pes, sizeof(*sub_pes));
765 sub_st = avformat_new_stream(pes->stream, NULL);
768 return AVERROR(ENOMEM);
771 sub_st->id = pes->pid;
772 avpriv_set_pts_info(sub_st, 33, 1, 90000);
773 sub_st->priv_data = sub_pes;
774 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
775 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
776 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
777 sub_pes->sub_st = pes->sub_st = sub_st;
780 if (st->codec->codec_id == AV_CODEC_ID_NONE)
781 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
782 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
783 st->codec->codec_id = old_codec_id;
784 st->codec->codec_type = old_codec_type;
790 static void reset_pes_packet_state(PESContext *pes)
792 pes->pts = AV_NOPTS_VALUE;
793 pes->dts = AV_NOPTS_VALUE;
796 av_buffer_unref(&pes->buffer);
799 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
803 pkt->buf = pes->buffer;
804 pkt->data = pes->buffer->data;
805 pkt->size = pes->data_index;
807 if (pes->total_size != MAX_PES_PAYLOAD &&
808 pes->pes_header_size + pes->data_index != pes->total_size +
810 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
811 pes->flags |= AV_PKT_FLAG_CORRUPT;
813 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
815 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
816 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
817 pkt->stream_index = pes->sub_st->index;
819 pkt->stream_index = pes->st->index;
822 /* store position of first TS packet of this PES packet */
823 pkt->pos = pes->ts_packet_pos;
824 pkt->flags = pes->flags;
827 reset_pes_packet_state(pes);
830 static uint64_t get_ts64(GetBitContext *gb, int bits)
832 if (get_bits_left(gb) < bits)
833 return AV_NOPTS_VALUE;
834 return get_bits64(gb, bits);
837 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
838 const uint8_t *buf, int buf_size)
841 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
842 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
843 int dts_flag = -1, cts_flag = -1;
844 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
846 init_get_bits(&gb, buf, buf_size * 8);
848 if (sl->use_au_start)
849 au_start_flag = get_bits1(&gb);
851 au_end_flag = get_bits1(&gb);
852 if (!sl->use_au_start && !sl->use_au_end)
853 au_start_flag = au_end_flag = 1;
855 ocr_flag = get_bits1(&gb);
857 idle_flag = get_bits1(&gb);
859 padding_flag = get_bits1(&gb);
861 padding_bits = get_bits(&gb, 3);
863 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
864 if (sl->packet_seq_num_len)
865 skip_bits_long(&gb, sl->packet_seq_num_len);
866 if (sl->degr_prior_len)
868 skip_bits(&gb, sl->degr_prior_len);
870 skip_bits_long(&gb, sl->ocr_len);
872 if (sl->use_rand_acc_pt)
874 if (sl->au_seq_num_len > 0)
875 skip_bits_long(&gb, sl->au_seq_num_len);
876 if (sl->use_timestamps) {
877 dts_flag = get_bits1(&gb);
878 cts_flag = get_bits1(&gb);
881 if (sl->inst_bitrate_len)
882 inst_bitrate_flag = get_bits1(&gb);
884 dts = get_ts64(&gb, sl->timestamp_len);
886 cts = get_ts64(&gb, sl->timestamp_len);
888 skip_bits_long(&gb, sl->au_len);
889 if (inst_bitrate_flag)
890 skip_bits_long(&gb, sl->inst_bitrate_len);
893 if (dts != AV_NOPTS_VALUE)
895 if (cts != AV_NOPTS_VALUE)
898 if (sl->timestamp_len && sl->timestamp_res)
899 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
901 return (get_bits_count(&gb) + 7) >> 3;
904 /* return non zero if a packet could be constructed */
905 static int mpegts_push_data(MpegTSFilter *filter,
906 const uint8_t *buf, int buf_size, int is_start,
909 PESContext *pes = filter->u.pes_filter.opaque;
910 MpegTSContext *ts = pes->ts;
918 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
919 new_pes_packet(pes, ts->pkt);
922 reset_pes_packet_state(pes);
924 pes->state = MPEGTS_HEADER;
925 pes->ts_packet_pos = pos;
928 while (buf_size > 0) {
929 switch (pes->state) {
931 len = PES_START_SIZE - pes->data_index;
934 memcpy(pes->header + pes->data_index, p, len);
935 pes->data_index += len;
938 if (pes->data_index == PES_START_SIZE) {
939 /* we got all the PES or section header. We can now
941 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
942 pes->header[2] == 0x01) {
943 /* it must be an mpeg2 PES stream */
944 code = pes->header[3] | 0x100;
945 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
948 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
950 pes->sub_st->discard == AVDISCARD_ALL)) ||
951 code == 0x1be) /* padding_stream */
954 /* stream not present in PMT */
956 pes->st = avformat_new_stream(ts->stream, NULL);
958 return AVERROR(ENOMEM);
959 pes->st->id = pes->pid;
960 mpegts_set_stream_info(pes->st, pes, 0, 0);
963 pes->total_size = AV_RB16(pes->header + 4);
964 /* NOTE: a zero total size means the PES size is
966 if (!pes->total_size)
967 pes->total_size = MAX_PES_PAYLOAD;
969 /* allocate pes buffer */
970 pes->buffer = av_buffer_alloc(pes->total_size +
971 FF_INPUT_BUFFER_PADDING_SIZE);
973 return AVERROR(ENOMEM);
975 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
976 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
977 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
978 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
979 pes->state = MPEGTS_PESHEADER;
980 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
982 "pid=%x stream_type=%x probing\n",
985 pes->st->request_probe = 1;
988 pes->state = MPEGTS_PAYLOAD;
992 /* otherwise, it should be a table */
995 pes->state = MPEGTS_SKIP;
1000 /**********************************************/
1001 /* PES packing parsing */
1002 case MPEGTS_PESHEADER:
1003 len = PES_HEADER_SIZE - pes->data_index;
1005 return AVERROR_INVALIDDATA;
1008 memcpy(pes->header + pes->data_index, p, len);
1009 pes->data_index += len;
1012 if (pes->data_index == PES_HEADER_SIZE) {
1013 pes->pes_header_size = pes->header[8] + 9;
1014 pes->state = MPEGTS_PESHEADER_FILL;
1017 case MPEGTS_PESHEADER_FILL:
1018 len = pes->pes_header_size - pes->data_index;
1020 return AVERROR_INVALIDDATA;
1023 memcpy(pes->header + pes->data_index, p, len);
1024 pes->data_index += len;
1027 if (pes->data_index == pes->pes_header_size) {
1029 unsigned int flags, pes_ext, skip;
1031 flags = pes->header[7];
1032 r = pes->header + 9;
1033 pes->pts = AV_NOPTS_VALUE;
1034 pes->dts = AV_NOPTS_VALUE;
1035 if ((flags & 0xc0) == 0x80) {
1036 pes->dts = pes->pts = ff_parse_pes_pts(r);
1038 } else if ((flags & 0xc0) == 0xc0) {
1039 pes->pts = ff_parse_pes_pts(r);
1041 pes->dts = ff_parse_pes_pts(r);
1044 pes->extended_stream_id = -1;
1045 if (flags & 0x01) { /* PES extension */
1047 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1048 skip = (pes_ext >> 4) & 0xb;
1051 if ((pes_ext & 0x41) == 0x01 &&
1052 (r + 2) <= (pes->header + pes->pes_header_size)) {
1053 /* PES extension 2 */
1054 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1055 pes->extended_stream_id = r[1];
1059 /* we got the full header. We parse it and get the payload */
1060 pes->state = MPEGTS_PAYLOAD;
1061 pes->data_index = 0;
1062 if (pes->stream_type == 0x12 && buf_size > 0) {
1063 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1065 pes->pes_header_size += sl_header_bytes;
1066 p += sl_header_bytes;
1067 buf_size -= sl_header_bytes;
1069 if (pes->stream_type == 0x15 && buf_size >= 5) {
1070 /* skip metadata access unit header */
1071 pes->pes_header_size += 5;
1075 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1076 AVProgram *p = NULL;
1077 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1078 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1079 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1081 AVStream *st = NULL;
1082 if (f->type == MPEGTS_PES) {
1083 PESContext *pcrpes = f->u.pes_filter.opaque;
1086 } else if (f->type == MPEGTS_PCR) {
1088 for (i = 0; i < p->nb_stream_indexes; i++) {
1089 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1090 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1094 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1095 // teletext packets do not always have correct timestamps,
1096 // the standard says they should be handled after 40.6 ms at most,
1097 // and the pcr error to this packet should be no more than 100 ms.
1098 // TODO: we should interpolate the PCR, not just use the last one
1099 int64_t pcr = f->last_pcr / 300;
1100 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1101 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1102 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1103 pes->pts = pes->dts = pcr;
1104 } else if (pes->dts > pcr + 3654 + 9000) {
1105 pes->pts = pes->dts = pcr + 3654 + 9000;
1115 case MPEGTS_PAYLOAD:
1117 if (pes->data_index > 0 &&
1118 pes->data_index + buf_size > pes->total_size) {
1119 new_pes_packet(pes, ts->pkt);
1120 pes->total_size = MAX_PES_PAYLOAD;
1121 pes->buffer = av_buffer_alloc(pes->total_size +
1122 FF_INPUT_BUFFER_PADDING_SIZE);
1124 return AVERROR(ENOMEM);
1126 } else if (pes->data_index == 0 &&
1127 buf_size > pes->total_size) {
1128 // pes packet size is < ts size packet and pes data is padded with 0xff
1129 // not sure if this is legal in ts but see issue #2392
1130 buf_size = pes->total_size;
1132 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1133 pes->data_index += buf_size;
1134 /* emit complete packets with known packet size
1135 * decreases demuxer delay for infrequent packets like subtitles from
1136 * a couple of seconds to milliseconds for properly muxed files.
1137 * total_size is the number of bytes following pes_packet_length
1138 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1139 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1140 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1142 new_pes_packet(pes, ts->pkt);
1156 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1161 /* if no pid found, then add a pid context */
1162 pes = av_mallocz(sizeof(PESContext));
1166 pes->stream = ts->stream;
1168 pes->pcr_pid = pcr_pid;
1169 pes->state = MPEGTS_SKIP;
1170 pes->pts = AV_NOPTS_VALUE;
1171 pes->dts = AV_NOPTS_VALUE;
1172 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1185 Mp4Descr *active_descr;
1187 int max_descr_count;
1189 } MP4DescrParseContext;
1191 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1192 const uint8_t *buf, unsigned size,
1193 Mp4Descr *descr, int max_descr_count)
1196 if (size > (1 << 30))
1197 return AVERROR_INVALIDDATA;
1199 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1200 NULL, NULL, NULL, NULL)) < 0)
1207 d->active_descr = NULL;
1208 d->max_descr_count = max_descr_count;
1213 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1215 int64_t new_off = avio_tell(pb);
1216 (*len) -= new_off - *off;
1220 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1223 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1226 int ret = parse_mp4_descr(d, off, len, 0);
1229 update_offsets(&d->pb, &off, &len);
1234 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1236 avio_rb16(&d->pb); // ID
1242 update_offsets(&d->pb, &off, &len);
1243 return parse_mp4_descr_arr(d, off, len);
1246 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1251 id_flags = avio_rb16(&d->pb);
1252 if (!(id_flags & 0x0020)) { // URL_Flag
1253 update_offsets(&d->pb, &off, &len);
1254 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1260 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1263 if (d->descr_count >= d->max_descr_count)
1264 return AVERROR_INVALIDDATA;
1265 ff_mp4_parse_es_descr(&d->pb, &es_id);
1266 d->active_descr = d->descr + (d->descr_count++);
1268 d->active_descr->es_id = es_id;
1269 update_offsets(&d->pb, &off, &len);
1270 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1271 update_offsets(&d->pb, &off, &len);
1273 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1274 d->active_descr = NULL;
1278 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1281 Mp4Descr *descr = d->active_descr;
1283 return AVERROR_INVALIDDATA;
1284 d->active_descr->dec_config_descr = av_malloc(len);
1285 if (!descr->dec_config_descr)
1286 return AVERROR(ENOMEM);
1287 descr->dec_config_descr_len = len;
1288 avio_read(&d->pb, descr->dec_config_descr, len);
1292 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1294 Mp4Descr *descr = d->active_descr;
1297 return AVERROR_INVALIDDATA;
1299 predefined = avio_r8(&d->pb);
1302 int flags = avio_r8(&d->pb);
1303 descr->sl.use_au_start = !!(flags & 0x80);
1304 descr->sl.use_au_end = !!(flags & 0x40);
1305 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1306 descr->sl.use_padding = !!(flags & 0x08);
1307 descr->sl.use_timestamps = !!(flags & 0x04);
1308 descr->sl.use_idle = !!(flags & 0x02);
1309 descr->sl.timestamp_res = avio_rb32(&d->pb);
1311 descr->sl.timestamp_len = avio_r8(&d->pb);
1312 if (descr->sl.timestamp_len > 64) {
1313 avpriv_request_sample(NULL, "timestamp_len > 64");
1314 descr->sl.timestamp_len = 64;
1315 return AVERROR_PATCHWELCOME;
1317 descr->sl.ocr_len = avio_r8(&d->pb);
1318 descr->sl.au_len = avio_r8(&d->pb);
1319 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1320 lengths = avio_rb16(&d->pb);
1321 descr->sl.degr_prior_len = lengths >> 12;
1322 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1323 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1325 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1330 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1334 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1335 update_offsets(&d->pb, &off, &len);
1336 if (len < 0 || len1 > len || len1 <= 0) {
1337 av_log(d->s, AV_LOG_ERROR,
1338 "Tag %x length violation new length %d bytes remaining %d\n",
1340 return AVERROR_INVALIDDATA;
1343 if (d->level++ >= MAX_LEVEL) {
1344 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1348 if (target_tag && tag != target_tag) {
1349 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1356 parse_MP4IODescrTag(d, off, len1);
1359 parse_MP4ODescrTag(d, off, len1);
1362 parse_MP4ESDescrTag(d, off, len1);
1364 case MP4DecConfigDescrTag:
1365 parse_MP4DecConfigDescrTag(d, off, len1);
1368 parse_MP4SLDescrTag(d, off, len1);
1375 avio_seek(&d->pb, off + len1, SEEK_SET);
1379 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1380 Mp4Descr *descr, int *descr_count, int max_descr_count)
1382 MP4DescrParseContext d;
1385 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1389 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1391 *descr_count = d.descr_count;
1395 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1396 Mp4Descr *descr, int *descr_count, int max_descr_count)
1398 MP4DescrParseContext d;
1401 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1405 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1407 *descr_count = d.descr_count;
1411 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1414 MpegTSContext *ts = filter->u.section_filter.opaque;
1416 const uint8_t *p, *p_end;
1418 int mp4_descr_count = 0;
1419 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1421 AVFormatContext *s = ts->stream;
1423 p_end = section + section_len - 4;
1425 if (parse_section_header(&h, &p, p_end) < 0)
1427 if (h.tid != M4OD_TID)
1430 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1431 MAX_MP4_DESCR_COUNT);
1433 for (pid = 0; pid < NB_PID_MAX; pid++) {
1436 for (i = 0; i < mp4_descr_count; i++) {
1439 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1441 if (ts->pids[pid]->type != MPEGTS_PES) {
1442 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1445 pes = ts->pids[pid]->u.pes_filter.opaque;
1450 pes->sl = mp4_descr[i].sl;
1452 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1453 mp4_descr[i].dec_config_descr_len, 0,
1454 NULL, NULL, NULL, NULL);
1455 ff_mp4_read_dec_config_descr(s, st, &pb);
1456 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1457 st->codec->extradata_size > 0)
1458 st->need_parsing = 0;
1459 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1460 st->codec->extradata_size > 0)
1461 st->need_parsing = 0;
1463 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1465 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1466 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1467 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1468 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1469 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1470 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1473 for (i = 0; i < mp4_descr_count; i++)
1474 av_free(mp4_descr[i].dec_config_descr);
1477 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1478 const uint8_t **pp, const uint8_t *desc_list_end,
1479 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1482 const uint8_t *desc_end;
1483 int desc_len, desc_tag, desc_es_id;
1487 desc_tag = get8(pp, desc_list_end);
1489 return AVERROR_INVALIDDATA;
1490 desc_len = get8(pp, desc_list_end);
1492 return AVERROR_INVALIDDATA;
1493 desc_end = *pp + desc_len;
1494 if (desc_end > desc_list_end)
1495 return AVERROR_INVALIDDATA;
1497 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1499 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1500 stream_type == STREAM_TYPE_PRIVATE_DATA)
1501 mpegts_find_stream_type(st, desc_tag, DESC_types);
1504 case 0x1E: /* SL descriptor */
1505 desc_es_id = get16(pp, desc_end);
1506 if (ts && ts->pids[pid])
1507 ts->pids[pid]->es_id = desc_es_id;
1508 for (i = 0; i < mp4_descr_count; i++)
1509 if (mp4_descr[i].dec_config_descr_len &&
1510 mp4_descr[i].es_id == desc_es_id) {
1512 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1513 mp4_descr[i].dec_config_descr_len, 0,
1514 NULL, NULL, NULL, NULL);
1515 ff_mp4_read_dec_config_descr(fc, st, &pb);
1516 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1517 st->codec->extradata_size > 0)
1518 st->need_parsing = 0;
1519 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1520 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1523 case 0x1F: /* FMC descriptor */
1524 get16(pp, desc_end);
1525 if (mp4_descr_count > 0 &&
1526 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1527 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1529 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1530 mp4_descr->dec_config_descr_len, 0,
1531 NULL, NULL, NULL, NULL);
1532 ff_mp4_read_dec_config_descr(fc, st, &pb);
1533 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1534 st->codec->extradata_size > 0) {
1535 st->request_probe = st->need_parsing = 0;
1536 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1540 case 0x56: /* DVB teletext descriptor */
1542 uint8_t *extradata = NULL;
1543 int language_count = desc_len / 5;
1545 if (desc_len > 0 && desc_len % 5 != 0)
1546 return AVERROR_INVALIDDATA;
1548 if (language_count > 0) {
1549 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1550 if (language_count > sizeof(language) / 4) {
1551 language_count = sizeof(language) / 4;
1554 if (st->codec->extradata == NULL) {
1555 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1556 return AVERROR(ENOMEM);
1560 if (st->codec->extradata_size < language_count * 2)
1561 return AVERROR_INVALIDDATA;
1563 extradata = st->codec->extradata;
1565 for (i = 0; i < language_count; i++) {
1566 language[i * 4 + 0] = get8(pp, desc_end);
1567 language[i * 4 + 1] = get8(pp, desc_end);
1568 language[i * 4 + 2] = get8(pp, desc_end);
1569 language[i * 4 + 3] = ',';
1571 memcpy(extradata, *pp, 2);
1577 language[i * 4 - 1] = 0;
1578 av_dict_set(&st->metadata, "language", language, 0);
1582 case 0x59: /* subtitling descriptor */
1584 /* 8 bytes per DVB subtitle substream data:
1585 * ISO_639_language_code (3 bytes),
1586 * subtitling_type (1 byte),
1587 * composition_page_id (2 bytes),
1588 * ancillary_page_id (2 bytes) */
1589 int language_count = desc_len / 8;
1591 if (desc_len > 0 && desc_len % 8 != 0)
1592 return AVERROR_INVALIDDATA;
1594 if (language_count > 1) {
1595 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1598 if (language_count > 0) {
1601 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1602 if (language_count > sizeof(language) / 4) {
1603 language_count = sizeof(language) / 4;
1606 if (st->codec->extradata == NULL) {
1607 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1608 return AVERROR(ENOMEM);
1612 if (st->codec->extradata_size < language_count * 5)
1613 return AVERROR_INVALIDDATA;
1615 extradata = st->codec->extradata;
1617 for (i = 0; i < language_count; i++) {
1618 language[i * 4 + 0] = get8(pp, desc_end);
1619 language[i * 4 + 1] = get8(pp, desc_end);
1620 language[i * 4 + 2] = get8(pp, desc_end);
1621 language[i * 4 + 3] = ',';
1623 /* hearing impaired subtitles detection using subtitling_type */
1625 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1626 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1627 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1628 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1629 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1630 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1631 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1635 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1636 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1642 language[i * 4 - 1] = 0;
1643 av_dict_set(&st->metadata, "language", language, 0);
1647 case 0x0a: /* ISO 639 language descriptor */
1648 for (i = 0; i + 4 <= desc_len; i += 4) {
1649 language[i + 0] = get8(pp, desc_end);
1650 language[i + 1] = get8(pp, desc_end);
1651 language[i + 2] = get8(pp, desc_end);
1652 language[i + 3] = ',';
1653 switch (get8(pp, desc_end)) {
1655 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1658 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1661 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1666 language[i - 1] = 0;
1667 av_dict_set(&st->metadata, "language", language, 0);
1670 case 0x05: /* registration descriptor */
1671 st->codec->codec_tag = bytestream_get_le32(pp);
1672 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1673 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1674 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1676 case 0x52: /* stream identifier descriptor */
1677 st->stream_identifier = 1 + get8(pp, desc_end);
1679 case 0x26: /* metadata descriptor */
1680 if (get16(pp, desc_end) == 0xFFFF)
1682 if (get8(pp, desc_end) == 0xFF) {
1683 st->codec->codec_tag = bytestream_get_le32(pp);
1684 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1685 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1695 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1697 MpegTSContext *ts = filter->u.section_filter.opaque;
1698 SectionHeader h1, *h = &h1;
1701 const uint8_t *p, *p_end, *desc_list_end;
1702 int program_info_length, pcr_pid, pid, stream_type;
1704 uint32_t prog_reg_desc = 0; /* registration descriptor */
1706 int mp4_descr_count = 0;
1707 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1710 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1711 hex_dump_debug(ts->stream, section, section_len);
1713 p_end = section + section_len - 4;
1715 if (parse_section_header(h, &p, p_end) < 0)
1718 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1719 h->id, h->sec_num, h->last_sec_num);
1721 if (h->tid != PMT_TID)
1724 clear_program(ts, h->id);
1725 pcr_pid = get16(&p, p_end);
1729 add_pid_to_pmt(ts, h->id, pcr_pid);
1730 set_pcr_pid(ts->stream, h->id, pcr_pid);
1732 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1734 program_info_length = get16(&p, p_end);
1735 if (program_info_length < 0)
1737 program_info_length &= 0xfff;
1738 while (program_info_length >= 2) {
1740 tag = get8(&p, p_end);
1741 len = get8(&p, p_end);
1743 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1745 if (len > program_info_length - 2)
1746 // something else is broken, exit the program_descriptors_loop
1748 program_info_length -= len + 2;
1749 if (tag == 0x1d) { // IOD descriptor
1750 get8(&p, p_end); // scope
1751 get8(&p, p_end); // label
1753 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1754 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1755 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1756 prog_reg_desc = bytestream_get_le32(&p);
1761 p += program_info_length;
1765 // stop parsing after pmt, we found header
1766 if (!ts->stream->nb_streams)
1769 set_pmt_found(ts, h->id);
1775 stream_type = get8(&p, p_end);
1776 if (stream_type < 0)
1778 pid = get16(&p, p_end);
1782 if (pid == ts->current_pid)
1785 /* now create stream */
1786 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1787 pes = ts->pids[pid]->u.pes_filter.opaque;
1789 pes->st = avformat_new_stream(pes->stream, NULL);
1792 pes->st->id = pes->pid;
1795 } else if (stream_type != 0x13) {
1797 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1798 pes = add_pes_stream(ts, pid, pcr_pid);
1800 st = avformat_new_stream(pes->stream, NULL);
1806 int idx = ff_find_stream_index(ts->stream, pid);
1808 st = ts->stream->streams[idx];
1810 st = avformat_new_stream(ts->stream, NULL);
1814 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1821 if (pes && !pes->stream_type)
1822 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1824 add_pid_to_pmt(ts, h->id, pid);
1826 ff_program_add_stream_index(ts->stream, h->id, st->index);
1828 desc_list_len = get16(&p, p_end);
1829 if (desc_list_len < 0)
1831 desc_list_len &= 0xfff;
1832 desc_list_end = p + desc_list_len;
1833 if (desc_list_end > p_end)
1836 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1837 desc_list_end, mp4_descr,
1838 mp4_descr_count, pid, ts) < 0)
1841 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1842 stream_type == 0x83 && pes->sub_st) {
1843 ff_program_add_stream_index(ts->stream, h->id,
1844 pes->sub_st->index);
1845 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1851 if (!ts->pids[pcr_pid])
1852 mpegts_open_pcr_filter(ts, pcr_pid);
1855 for (i = 0; i < mp4_descr_count; i++)
1856 av_free(mp4_descr[i].dec_config_descr);
1859 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1861 MpegTSContext *ts = filter->u.section_filter.opaque;
1862 SectionHeader h1, *h = &h1;
1863 const uint8_t *p, *p_end;
1867 av_dlog(ts->stream, "PAT:\n");
1868 hex_dump_debug(ts->stream, section, section_len);
1870 p_end = section + section_len - 4;
1872 if (parse_section_header(h, &p, p_end) < 0)
1874 if (h->tid != PAT_TID)
1877 ts->stream->ts_id = h->id;
1881 sid = get16(&p, p_end);
1884 pmt_pid = get16(&p, p_end);
1889 if (pmt_pid == ts->current_pid)
1892 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1894 if (sid == 0x0000) {
1897 MpegTSFilter *fil = ts->pids[pmt_pid];
1898 program = av_new_program(ts->stream, sid);
1899 program->program_num = sid;
1900 program->pmt_pid = pmt_pid;
1902 if ( fil->type != MPEGTS_SECTION
1903 || fil->pid != pmt_pid
1904 || fil->u.section_filter.section_cb != pmt_cb)
1905 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1907 if (!ts->pids[pmt_pid])
1908 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1909 add_pat_entry(ts, sid);
1910 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1911 add_pid_to_pmt(ts, sid, pmt_pid);
1917 for (j=0; j<ts->stream->nb_programs; j++) {
1918 for (i = 0; i < ts->nb_prg; i++)
1919 if (ts->prg[i].id == ts->stream->programs[j]->id)
1922 clear_avprogram(ts, ts->stream->programs[j]->id);
1927 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1929 MpegTSContext *ts = filter->u.section_filter.opaque;
1930 SectionHeader h1, *h = &h1;
1931 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1932 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1933 char *name, *provider_name;
1935 av_dlog(ts->stream, "SDT:\n");
1936 hex_dump_debug(ts->stream, section, section_len);
1938 p_end = section + section_len - 4;
1940 if (parse_section_header(h, &p, p_end) < 0)
1942 if (h->tid != SDT_TID)
1944 onid = get16(&p, p_end);
1947 val = get8(&p, p_end);
1951 sid = get16(&p, p_end);
1954 val = get8(&p, p_end);
1957 desc_list_len = get16(&p, p_end);
1958 if (desc_list_len < 0)
1960 desc_list_len &= 0xfff;
1961 desc_list_end = p + desc_list_len;
1962 if (desc_list_end > p_end)
1965 desc_tag = get8(&p, desc_list_end);
1968 desc_len = get8(&p, desc_list_end);
1969 desc_end = p + desc_len;
1970 if (desc_end > desc_list_end)
1973 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1974 desc_tag, desc_len);
1978 service_type = get8(&p, p_end);
1979 if (service_type < 0)
1981 provider_name = getstr8(&p, p_end);
1984 name = getstr8(&p, p_end);
1986 AVProgram *program = av_new_program(ts->stream, sid);
1988 av_dict_set(&program->metadata, "service_name", name, 0);
1989 av_dict_set(&program->metadata, "service_provider",
1994 av_free(provider_name);
2005 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2006 const uint8_t *packet);
2008 /* handle one TS packet */
2009 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2011 AVFormatContext *s = ts->stream;
2013 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2014 has_adaptation, has_payload;
2015 const uint8_t *p, *p_end;
2018 pid = AV_RB16(packet + 1) & 0x1fff;
2019 if (pid && discard_pid(ts, pid))
2021 is_start = packet[1] & 0x40;
2022 tss = ts->pids[pid];
2023 if (ts->auto_guess && tss == NULL && is_start) {
2024 add_pes_stream(ts, pid, -1);
2025 tss = ts->pids[pid];
2029 ts->current_pid = pid;
2031 afc = (packet[3] >> 4) & 3;
2032 if (afc == 0) /* reserved value */
2034 has_adaptation = afc & 2;
2035 has_payload = afc & 1;
2036 is_discontinuity = has_adaptation &&
2037 packet[4] != 0 && /* with length > 0 */
2038 (packet[5] & 0x80); /* and discontinuity indicated */
2040 /* continuity check (currently not used) */
2041 cc = (packet[3] & 0xf);
2042 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2043 cc_ok = pid == 0x1FFF || // null packet PID
2050 av_log(ts->stream, AV_LOG_DEBUG,
2051 "Continuity check failed for pid %d expected %d got %d\n",
2052 pid, expected_cc, cc);
2053 if (tss->type == MPEGTS_PES) {
2054 PESContext *pc = tss->u.pes_filter.opaque;
2055 pc->flags |= AV_PKT_FLAG_CORRUPT;
2059 if (!has_payload && tss->type != MPEGTS_PCR)
2062 if (has_adaptation) {
2063 /* skip adaptation field */
2066 /* if past the end of packet, ignore */
2067 p_end = packet + TS_PACKET_SIZE;
2068 if (p > p_end || (p == p_end && tss->type != MPEGTS_PCR))
2071 pos = avio_tell(ts->stream->pb);
2073 av_assert0(pos >= TS_PACKET_SIZE);
2074 ts->pos47_full = pos - TS_PACKET_SIZE;
2077 if (tss->type == MPEGTS_SECTION) {
2079 /* pointer field present */
2081 if (p + len > p_end)
2084 /* write remaining section bytes */
2085 write_section_data(s, tss,
2087 /* check whether filter has been closed */
2093 write_section_data(s, tss,
2098 write_section_data(s, tss,
2103 // stop find_stream_info from waiting for more streams
2104 // when all programs have received a PMT
2105 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2107 for (i = 0; i < ts->nb_prg; i++) {
2108 if (!ts->prg[i].pmt_found)
2111 if (i == ts->nb_prg && ts->nb_prg > 0) {
2112 if (ts->stream->nb_streams > 1 || pos > 100000) {
2113 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2114 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2123 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2124 tss->last_pcr = pcr_h * 300 + pcr_l;
2125 // Note: The position here points actually behind the current packet.
2126 if (tss->type == MPEGTS_PES) {
2127 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2128 pos - ts->raw_packet_size)) < 0)
2136 static void reanalyze(MpegTSContext *ts) {
2137 AVIOContext *pb = ts->stream->pb;
2138 int64_t pos = avio_tell(pb);
2141 pos -= ts->pos47_full;
2142 if (pos == TS_PACKET_SIZE) {
2143 ts->size_stat[0] ++;
2144 } else if (pos == TS_DVHS_PACKET_SIZE) {
2145 ts->size_stat[1] ++;
2146 } else if (pos == TS_FEC_PACKET_SIZE) {
2147 ts->size_stat[2] ++;
2150 ts->size_stat_count ++;
2151 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2153 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2154 newsize = TS_PACKET_SIZE;
2155 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2156 newsize = TS_DVHS_PACKET_SIZE;
2157 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2158 newsize = TS_FEC_PACKET_SIZE;
2160 if (newsize && newsize != ts->raw_packet_size) {
2161 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2162 ts->raw_packet_size = newsize;
2164 ts->size_stat_count = 0;
2165 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2169 /* XXX: try to find a better synchro over several packets (use
2170 * get_packet_size() ?) */
2171 static int mpegts_resync(AVFormatContext *s)
2173 AVIOContext *pb = s->pb;
2176 for (i = 0; i < MAX_RESYNC_SIZE; i++) {
2181 avio_seek(pb, -1, SEEK_CUR);
2182 reanalyze(s->priv_data);
2186 av_log(s, AV_LOG_ERROR,
2187 "max resync size reached, could not find sync byte\n");
2189 return AVERROR_INVALIDDATA;
2192 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2193 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2194 const uint8_t **data)
2196 AVIOContext *pb = s->pb;
2200 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2201 if (len != TS_PACKET_SIZE)
2202 return len < 0 ? len : AVERROR_EOF;
2203 /* check packet sync byte */
2204 if ((*data)[0] != 0x47) {
2205 /* find a new packet start */
2206 uint64_t pos = avio_tell(pb);
2207 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2209 if (mpegts_resync(s) < 0)
2210 return AVERROR(EAGAIN);
2220 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2222 AVIOContext *pb = s->pb;
2223 int skip = raw_packet_size - TS_PACKET_SIZE;
2225 avio_skip(pb, skip);
2228 static int handle_packets(MpegTSContext *ts, int nb_packets)
2230 AVFormatContext *s = ts->stream;
2231 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2232 const uint8_t *data;
2233 int packet_num, ret = 0;
2235 if (avio_tell(s->pb) != ts->last_pos) {
2237 av_dlog(ts->stream, "Skipping after seek\n");
2238 /* seek detected, flush pes buffer */
2239 for (i = 0; i < NB_PID_MAX; i++) {
2241 if (ts->pids[i]->type == MPEGTS_PES) {
2242 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2243 av_buffer_unref(&pes->buffer);
2244 pes->data_index = 0;
2245 pes->state = MPEGTS_SKIP; /* skip until pes header */
2247 ts->pids[i]->last_cc = -1;
2248 ts->pids[i]->last_pcr = -1;
2255 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2258 if (nb_packets != 0 && packet_num >= nb_packets ||
2259 ts->stop_parse > 1) {
2260 ret = AVERROR(EAGAIN);
2263 if (ts->stop_parse > 0)
2266 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2269 ret = handle_packet(ts, data);
2270 finished_reading_packet(s, ts->raw_packet_size);
2274 ts->last_pos = avio_tell(s->pb);
2278 static int mpegts_probe(AVProbeData *p)
2280 const int size = p->buf_size;
2284 int check_count = size / TS_FEC_PACKET_SIZE;
2285 #define CHECK_COUNT 10
2286 #define CHECK_BLOCK 100
2288 if (check_count < CHECK_COUNT)
2289 return AVERROR_INVALIDDATA;
2291 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2292 int left = FFMIN(check_count - i, CHECK_BLOCK);
2293 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2294 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2295 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2296 score = FFMAX3(score, dvhs_score, fec_score);
2298 maxscore = FFMAX(maxscore, score);
2301 sumscore = sumscore * CHECK_COUNT / check_count;
2302 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2304 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2306 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2307 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2309 return AVERROR_INVALIDDATA;
2312 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2313 * (-1) if not available */
2314 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2316 int afc, len, flags;
2320 afc = (packet[3] >> 4) & 3;
2322 return AVERROR_INVALIDDATA;
2327 return AVERROR_INVALIDDATA;
2330 if (!(flags & 0x10))
2331 return AVERROR_INVALIDDATA;
2333 return AVERROR_INVALIDDATA;
2335 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2336 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2340 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2342 /* NOTE: We attempt to seek on non-seekable files as well, as the
2343 * probe buffer usually is big enough. Only warn if the seek failed
2344 * on files where the seek should work. */
2345 if (avio_seek(pb, pos, SEEK_SET) < 0)
2346 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2349 static int mpegts_read_header(AVFormatContext *s)
2351 MpegTSContext *ts = s->priv_data;
2352 AVIOContext *pb = s->pb;
2353 uint8_t buf[8 * 1024] = {0};
2357 ffio_ensure_seekback(pb, s->probesize);
2359 /* read the first 8192 bytes to get packet size */
2360 pos = avio_tell(pb);
2361 len = avio_read(pb, buf, sizeof(buf));
2362 ts->raw_packet_size = get_packet_size(buf, len);
2363 if (ts->raw_packet_size <= 0) {
2364 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2365 ts->raw_packet_size = TS_PACKET_SIZE;
2370 if (s->iformat == &ff_mpegts_demuxer) {
2373 /* first do a scan to get all the services */
2374 seek_back(s, pb, pos);
2376 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2378 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2380 handle_packets(ts, s->probesize / ts->raw_packet_size);
2381 /* if could not find service, enable auto_guess */
2385 av_dlog(ts->stream, "tuning done\n");
2387 s->ctx_flags |= AVFMTCTX_NOHEADER;
2390 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2391 int64_t pcrs[2], pcr_h;
2392 int packet_count[2];
2393 uint8_t packet[TS_PACKET_SIZE];
2394 const uint8_t *data;
2396 /* only read packets */
2398 st = avformat_new_stream(s, NULL);
2400 return AVERROR(ENOMEM);
2401 avpriv_set_pts_info(st, 60, 1, 27000000);
2402 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2403 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2405 /* we iterate until we find two PCRs to estimate the bitrate */
2410 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2413 pid = AV_RB16(data + 1) & 0x1fff;
2414 if ((pcr_pid == -1 || pcr_pid == pid) &&
2415 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2416 finished_reading_packet(s, ts->raw_packet_size);
2418 packet_count[nb_pcrs] = nb_packets;
2419 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2424 finished_reading_packet(s, ts->raw_packet_size);
2429 /* NOTE1: the bitrate is computed without the FEC */
2430 /* NOTE2: it is only the bitrate of the start of the stream */
2431 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2432 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2433 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2434 st->codec->bit_rate = s->bit_rate;
2435 st->start_time = ts->cur_pcr;
2436 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2437 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2440 seek_back(s, pb, pos);
2444 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2446 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2448 MpegTSContext *ts = s->priv_data;
2450 int64_t pcr_h, next_pcr_h, pos;
2451 int pcr_l, next_pcr_l;
2452 uint8_t pcr_buf[12];
2453 const uint8_t *data;
2455 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2456 return AVERROR(ENOMEM);
2457 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2458 pkt->pos = avio_tell(s->pb);
2460 av_free_packet(pkt);
2463 if (data != pkt->data)
2464 memcpy(pkt->data, data, ts->raw_packet_size);
2465 finished_reading_packet(s, ts->raw_packet_size);
2466 if (ts->mpeg2ts_compute_pcr) {
2467 /* compute exact PCR for each packet */
2468 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2469 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2470 pos = avio_tell(s->pb);
2471 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2472 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2473 avio_read(s->pb, pcr_buf, 12);
2474 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2475 /* XXX: not precise enough */
2477 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2482 avio_seek(s->pb, pos, SEEK_SET);
2483 /* no next PCR found: we use previous increment */
2484 ts->cur_pcr = pcr_h * 300 + pcr_l;
2486 pkt->pts = ts->cur_pcr;
2487 pkt->duration = ts->pcr_incr;
2488 ts->cur_pcr += ts->pcr_incr;
2490 pkt->stream_index = 0;
2494 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2496 MpegTSContext *ts = s->priv_data;
2501 ret = handle_packets(ts, 0);
2503 av_free_packet(ts->pkt);
2504 /* flush pes data left */
2505 for (i = 0; i < NB_PID_MAX; i++)
2506 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2507 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2508 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2509 new_pes_packet(pes, pkt);
2510 pes->state = MPEGTS_SKIP;
2517 if (!ret && pkt->size < 0)
2518 ret = AVERROR(EINTR);
2522 static void mpegts_free(MpegTSContext *ts)
2528 for (i = 0; i < NB_PID_MAX; i++)
2530 mpegts_close_filter(ts, ts->pids[i]);
2533 static int mpegts_read_close(AVFormatContext *s)
2535 MpegTSContext *ts = s->priv_data;
2540 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2541 int64_t *ppos, int64_t pos_limit)
2543 MpegTSContext *ts = s->priv_data;
2544 int64_t pos, timestamp;
2545 uint8_t buf[TS_PACKET_SIZE];
2546 int pcr_l, pcr_pid =
2547 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2548 int pos47 = ts->pos47_full % ts->raw_packet_size;
2550 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2551 ts->raw_packet_size + pos47;
2552 while(pos < pos_limit) {
2553 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2554 return AV_NOPTS_VALUE;
2555 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2556 return AV_NOPTS_VALUE;
2557 if (buf[0] != 0x47) {
2558 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2559 if (mpegts_resync(s) < 0)
2560 return AV_NOPTS_VALUE;
2561 pos = avio_tell(s->pb);
2564 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2565 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2569 pos += ts->raw_packet_size;
2572 return AV_NOPTS_VALUE;
2575 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2576 int64_t *ppos, int64_t pos_limit)
2578 MpegTSContext *ts = s->priv_data;
2580 int pos47 = ts->pos47_full % ts->raw_packet_size;
2581 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2582 ff_read_frame_flush(s);
2583 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2584 return AV_NOPTS_VALUE;
2585 while(pos < pos_limit) {
2588 av_init_packet(&pkt);
2589 ret = av_read_frame(s, &pkt);
2591 return AV_NOPTS_VALUE;
2592 av_free_packet(&pkt);
2593 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2594 ff_reduce_index(s, pkt.stream_index);
2595 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2596 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2604 return AV_NOPTS_VALUE;
2607 /**************************************************************/
2608 /* parsing functions - called from other demuxers such as RTP */
2610 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2614 ts = av_mallocz(sizeof(MpegTSContext));
2617 /* no stream case, currently used by RTP */
2618 ts->raw_packet_size = TS_PACKET_SIZE;
2621 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2622 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2627 /* return the consumed length if a packet was output, or -1 if no
2628 * packet is output */
2629 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2630 const uint8_t *buf, int len)
2638 if (len < TS_PACKET_SIZE)
2639 return AVERROR_INVALIDDATA;
2640 if (buf[0] != 0x47) {
2644 handle_packet(ts, buf);
2645 buf += TS_PACKET_SIZE;
2646 len -= TS_PACKET_SIZE;
2647 if (ts->stop_parse == 1)
2654 void ff_mpegts_parse_close(MpegTSContext *ts)
2660 AVInputFormat ff_mpegts_demuxer = {
2662 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2663 .priv_data_size = sizeof(MpegTSContext),
2664 .read_probe = mpegts_probe,
2665 .read_header = mpegts_read_header,
2666 .read_packet = mpegts_read_packet,
2667 .read_close = mpegts_read_close,
2668 .read_timestamp = mpegts_get_dts,
2669 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2670 .priv_class = &mpegts_class,
2673 AVInputFormat ff_mpegtsraw_demuxer = {
2674 .name = "mpegtsraw",
2675 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2676 .priv_data_size = sizeof(MpegTSContext),
2677 .read_header = mpegts_read_header,
2678 .read_packet = mpegts_raw_read_packet,
2679 .read_close = mpegts_read_close,
2680 .read_timestamp = mpegts_get_dts,
2681 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2682 .priv_class = &mpegtsraw_class,