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 */
142 /******************************************/
143 /* private mpegts data */
145 /** structure to keep track of Program->pids mapping */
149 int8_t crc_validity[NB_PID_MAX];
150 /** filters for various streams specified by PMT + for the PAT and PMT */
151 MpegTSFilter *pids[NB_PID_MAX];
155 static const AVOption mpegtsraw_options[] = {
156 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
157 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
158 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
159 { "ts_packetsize", "Output option carrying the raw packet size.",
160 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
162 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
166 static const AVClass mpegtsraw_class = {
167 .class_name = "mpegtsraw demuxer",
168 .item_name = av_default_item_name,
169 .option = mpegtsraw_options,
170 .version = LIBAVUTIL_VERSION_INT,
173 static const AVOption mpegts_options[] = {
174 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
175 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
176 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
177 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
178 {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
179 {.i64 = 0}, 0, 1, 0 },
183 static const AVClass mpegts_class = {
184 .class_name = "mpegts demuxer",
185 .item_name = av_default_item_name,
186 .option = mpegts_options,
187 .version = LIBAVUTIL_VERSION_INT,
190 /* TS stream handling */
195 MPEGTS_PESHEADER_FILL,
200 /* enough for PES header + length */
201 #define PES_START_SIZE 6
202 #define PES_HEADER_SIZE 9
203 #define MAX_PES_HEADER_SIZE (9 + 255)
205 typedef struct PESContext {
207 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
210 AVFormatContext *stream;
212 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
213 enum MpegTSState state;
214 /* used to get the format */
216 int flags; /**< copied to the AVPacket flags */
219 int extended_stream_id;
221 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
222 uint8_t header[MAX_PES_HEADER_SIZE];
227 extern AVInputFormat ff_mpegts_demuxer;
229 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
232 for (i = 0; i < ts->nb_prg; i++) {
233 if (ts->prg[i].id == programid) {
240 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
242 AVProgram *prg = NULL;
245 for (i = 0; i < ts->stream->nb_programs; i++)
246 if (ts->stream->programs[i]->id == programid) {
247 prg = ts->stream->programs[i];
252 prg->nb_stream_indexes = 0;
255 static void clear_program(MpegTSContext *ts, unsigned int programid)
259 clear_avprogram(ts, programid);
260 for (i = 0; i < ts->nb_prg; i++)
261 if (ts->prg[i].id == programid) {
262 ts->prg[i].nb_pids = 0;
263 ts->prg[i].pmt_found = 0;
267 static void clear_programs(MpegTSContext *ts)
273 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
276 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
280 p = &ts->prg[ts->nb_prg];
287 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
290 struct Program *p = get_program(ts, programid);
294 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
296 p->pids[p->nb_pids++] = pid;
299 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
301 struct Program *p = get_program(ts, programid);
308 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
311 for (i = 0; i < s->nb_programs; i++) {
312 if (s->programs[i]->id == programid) {
313 s->programs[i]->pcr_pid = pid;
320 * @brief discard_pid() decides if the pid is to be discarded according
321 * to caller's programs selection
322 * @param ts : - TS context
324 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
327 static int discard_pid(MpegTSContext *ts, unsigned int pid)
330 int used = 0, discarded = 0;
333 /* If none of the programs have .discard=AVDISCARD_ALL then there's
334 * no way we have to discard this packet */
335 for (k = 0; k < ts->stream->nb_programs; k++)
336 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
338 if (k == ts->stream->nb_programs)
341 for (i = 0; i < ts->nb_prg; i++) {
343 for (j = 0; j < p->nb_pids; j++) {
344 if (p->pids[j] != pid)
346 // is program with id p->id set to be discarded?
347 for (k = 0; k < ts->stream->nb_programs; k++) {
348 if (ts->stream->programs[k]->id == p->id) {
349 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
358 return !used && discarded;
362 * Assemble PES packets out of TS packets, and then call the "section_cb"
363 * function when they are complete.
365 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
366 const uint8_t *buf, int buf_size, int is_start)
368 MpegTSSectionFilter *tss = &tss1->u.section_filter;
372 memcpy(tss->section_buf, buf, buf_size);
373 tss->section_index = buf_size;
374 tss->section_h_size = -1;
375 tss->end_of_section_reached = 0;
377 if (tss->end_of_section_reached)
379 len = 4096 - tss->section_index;
382 memcpy(tss->section_buf + tss->section_index, buf, len);
383 tss->section_index += len;
386 /* compute section length if possible */
387 if (tss->section_h_size == -1 && tss->section_index >= 3) {
388 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
391 tss->section_h_size = len;
394 if (tss->section_h_size != -1 &&
395 tss->section_index >= tss->section_h_size) {
397 tss->end_of_section_reached = 1;
399 if (tss->check_crc) {
400 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
402 ts->crc_validity[ tss1->pid ] = 100;
403 }else if (ts->crc_validity[ tss1->pid ] > -10) {
404 ts->crc_validity[ tss1->pid ]--;
409 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
413 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
414 enum MpegTSFilterType type)
416 MpegTSFilter *filter;
418 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
420 if (pid >= NB_PID_MAX || ts->pids[pid])
422 filter = av_mallocz(sizeof(MpegTSFilter));
425 ts->pids[pid] = filter;
430 filter->last_cc = -1;
431 filter->last_pcr= -1;
436 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
438 SectionCallback *section_cb,
442 MpegTSFilter *filter;
443 MpegTSSectionFilter *sec;
445 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
447 sec = &filter->u.section_filter;
448 sec->section_cb = section_cb;
449 sec->opaque = opaque;
450 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
451 sec->check_crc = check_crc;
452 if (!sec->section_buf) {
459 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
463 MpegTSFilter *filter;
464 MpegTSPESFilter *pes;
466 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
469 pes = &filter->u.pes_filter;
470 pes->pes_cb = pes_cb;
471 pes->opaque = opaque;
475 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
477 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
480 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
485 if (filter->type == MPEGTS_SECTION)
486 av_freep(&filter->u.section_filter.section_buf);
487 else if (filter->type == MPEGTS_PES) {
488 PESContext *pes = filter->u.pes_filter.opaque;
489 av_buffer_unref(&pes->buffer);
490 /* referenced private data will be freed later in
491 * avformat_close_input */
492 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
493 av_freep(&filter->u.pes_filter.opaque);
498 ts->pids[pid] = NULL;
501 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
503 int stat[TS_MAX_PACKET_SIZE];
507 memset(stat, 0, packet_size * sizeof(*stat));
509 for (i = 0; i < size - 3; i++) {
510 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
511 int x = i % packet_size;
513 if (stat[x] > best_score) {
514 best_score = stat[x];
524 /* autodetect fec presence. Must have at least 1024 bytes */
525 static int get_packet_size(const uint8_t *buf, int size)
527 int score, fec_score, dvhs_score;
529 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
530 return AVERROR_INVALIDDATA;
532 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
533 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
534 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
535 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
536 score, dvhs_score, fec_score);
538 if (score > fec_score && score > dvhs_score)
539 return TS_PACKET_SIZE;
540 else if (dvhs_score > score && dvhs_score > fec_score)
541 return TS_DVHS_PACKET_SIZE;
542 else if (score < fec_score && dvhs_score < fec_score)
543 return TS_FEC_PACKET_SIZE;
545 return AVERROR_INVALIDDATA;
548 typedef struct SectionHeader {
553 uint8_t last_sec_num;
556 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
563 return AVERROR_INVALIDDATA;
569 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
575 if ((p + 1) >= p_end)
576 return AVERROR_INVALIDDATA;
583 /* read and allocate a DVB string preceded by its length */
584 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
591 len = get8(&p, p_end);
594 if ((p + len) > p_end)
596 str = av_malloc(len + 1);
606 static int parse_section_header(SectionHeader *h,
607 const uint8_t **pp, const uint8_t *p_end)
611 val = get8(pp, p_end);
616 val = get16(pp, p_end);
620 val = get8(pp, p_end);
623 h->version = (val >> 1) & 0x1f;
624 val = get8(pp, p_end);
628 val = get8(pp, p_end);
631 h->last_sec_num = val;
636 uint32_t stream_type;
637 enum AVMediaType codec_type;
638 enum AVCodecID codec_id;
641 static const StreamType ISO_types[] = {
642 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
643 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
644 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
645 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
646 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
647 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
648 /* Makito encoder sets stream type 0x11 for AAC,
649 * so auto-detect LOAS/LATM instead of hardcoding it. */
650 #if !CONFIG_LOAS_DEMUXER
651 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
653 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
654 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
655 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
656 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
657 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
661 static const StreamType HDMV_types[] = {
662 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
663 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
664 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
665 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
666 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
667 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
668 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
669 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
670 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
671 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
676 static const StreamType MISC_types[] = {
677 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
678 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
682 static const StreamType REGD_types[] = {
683 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
684 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
685 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
686 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
687 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
688 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
689 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
690 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
691 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
695 static const StreamType METADATA_types[] = {
696 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
697 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
701 /* descriptor present */
702 static const StreamType DESC_types[] = {
703 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
704 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
705 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
706 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
707 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
711 static void mpegts_find_stream_type(AVStream *st,
712 uint32_t stream_type,
713 const StreamType *types)
715 if (avcodec_is_open(st->codec)) {
716 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
720 for (; types->stream_type; types++)
721 if (stream_type == types->stream_type) {
722 st->codec->codec_type = types->codec_type;
723 st->codec->codec_id = types->codec_id;
724 st->request_probe = 0;
729 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
730 uint32_t stream_type, uint32_t prog_reg_desc)
732 int old_codec_type = st->codec->codec_type;
733 int old_codec_id = st->codec->codec_id;
735 if (avcodec_is_open(st->codec)) {
736 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
740 avpriv_set_pts_info(st, 33, 1, 90000);
742 st->codec->codec_type = AVMEDIA_TYPE_DATA;
743 st->codec->codec_id = AV_CODEC_ID_NONE;
744 st->need_parsing = AVSTREAM_PARSE_FULL;
746 pes->stream_type = stream_type;
748 av_log(pes->stream, AV_LOG_DEBUG,
749 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
750 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
752 st->codec->codec_tag = pes->stream_type;
754 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
755 if ((prog_reg_desc == AV_RL32("HDMV") ||
756 prog_reg_desc == AV_RL32("HDPR")) &&
757 st->codec->codec_id == AV_CODEC_ID_NONE) {
758 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
759 if (pes->stream_type == 0x83) {
760 // HDMV TrueHD streams also contain an AC3 coded version of the
761 // audio track - add a second stream for this
763 // priv_data cannot be shared between streams
764 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
766 return AVERROR(ENOMEM);
767 memcpy(sub_pes, pes, sizeof(*sub_pes));
769 sub_st = avformat_new_stream(pes->stream, NULL);
772 return AVERROR(ENOMEM);
775 sub_st->id = pes->pid;
776 avpriv_set_pts_info(sub_st, 33, 1, 90000);
777 sub_st->priv_data = sub_pes;
778 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
779 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
780 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
781 sub_pes->sub_st = pes->sub_st = sub_st;
784 if (st->codec->codec_id == AV_CODEC_ID_NONE)
785 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
786 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
787 st->codec->codec_id = old_codec_id;
788 st->codec->codec_type = old_codec_type;
794 static void reset_pes_packet_state(PESContext *pes)
796 pes->pts = AV_NOPTS_VALUE;
797 pes->dts = AV_NOPTS_VALUE;
800 av_buffer_unref(&pes->buffer);
803 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
807 pkt->buf = pes->buffer;
808 pkt->data = pes->buffer->data;
809 pkt->size = pes->data_index;
811 if (pes->total_size != MAX_PES_PAYLOAD &&
812 pes->pes_header_size + pes->data_index != pes->total_size +
814 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
815 pes->flags |= AV_PKT_FLAG_CORRUPT;
817 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
819 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
820 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
821 pkt->stream_index = pes->sub_st->index;
823 pkt->stream_index = pes->st->index;
826 /* store position of first TS packet of this PES packet */
827 pkt->pos = pes->ts_packet_pos;
828 pkt->flags = pes->flags;
831 reset_pes_packet_state(pes);
834 static uint64_t get_ts64(GetBitContext *gb, int bits)
836 if (get_bits_left(gb) < bits)
837 return AV_NOPTS_VALUE;
838 return get_bits64(gb, bits);
841 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
842 const uint8_t *buf, int buf_size)
845 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
846 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
847 int dts_flag = -1, cts_flag = -1;
848 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
850 init_get_bits(&gb, buf, buf_size * 8);
852 if (sl->use_au_start)
853 au_start_flag = get_bits1(&gb);
855 au_end_flag = get_bits1(&gb);
856 if (!sl->use_au_start && !sl->use_au_end)
857 au_start_flag = au_end_flag = 1;
859 ocr_flag = get_bits1(&gb);
861 idle_flag = get_bits1(&gb);
863 padding_flag = get_bits1(&gb);
865 padding_bits = get_bits(&gb, 3);
867 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
868 if (sl->packet_seq_num_len)
869 skip_bits_long(&gb, sl->packet_seq_num_len);
870 if (sl->degr_prior_len)
872 skip_bits(&gb, sl->degr_prior_len);
874 skip_bits_long(&gb, sl->ocr_len);
876 if (sl->use_rand_acc_pt)
878 if (sl->au_seq_num_len > 0)
879 skip_bits_long(&gb, sl->au_seq_num_len);
880 if (sl->use_timestamps) {
881 dts_flag = get_bits1(&gb);
882 cts_flag = get_bits1(&gb);
885 if (sl->inst_bitrate_len)
886 inst_bitrate_flag = get_bits1(&gb);
888 dts = get_ts64(&gb, sl->timestamp_len);
890 cts = get_ts64(&gb, sl->timestamp_len);
892 skip_bits_long(&gb, sl->au_len);
893 if (inst_bitrate_flag)
894 skip_bits_long(&gb, sl->inst_bitrate_len);
897 if (dts != AV_NOPTS_VALUE)
899 if (cts != AV_NOPTS_VALUE)
902 if (sl->timestamp_len && sl->timestamp_res)
903 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
905 return (get_bits_count(&gb) + 7) >> 3;
908 /* return non zero if a packet could be constructed */
909 static int mpegts_push_data(MpegTSFilter *filter,
910 const uint8_t *buf, int buf_size, int is_start,
913 PESContext *pes = filter->u.pes_filter.opaque;
914 MpegTSContext *ts = pes->ts;
922 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
923 new_pes_packet(pes, ts->pkt);
926 reset_pes_packet_state(pes);
928 pes->state = MPEGTS_HEADER;
929 pes->ts_packet_pos = pos;
932 while (buf_size > 0) {
933 switch (pes->state) {
935 len = PES_START_SIZE - pes->data_index;
938 memcpy(pes->header + pes->data_index, p, len);
939 pes->data_index += len;
942 if (pes->data_index == PES_START_SIZE) {
943 /* we got all the PES or section header. We can now
945 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
946 pes->header[2] == 0x01) {
947 /* it must be an mpeg2 PES stream */
948 code = pes->header[3] | 0x100;
949 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
952 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
954 pes->sub_st->discard == AVDISCARD_ALL)) ||
955 code == 0x1be) /* padding_stream */
958 /* stream not present in PMT */
960 if (ts->skip_changes)
963 pes->st = avformat_new_stream(ts->stream, NULL);
965 return AVERROR(ENOMEM);
966 pes->st->id = pes->pid;
967 mpegts_set_stream_info(pes->st, pes, 0, 0);
970 pes->total_size = AV_RB16(pes->header + 4);
971 /* NOTE: a zero total size means the PES size is
973 if (!pes->total_size)
974 pes->total_size = MAX_PES_PAYLOAD;
976 /* allocate pes buffer */
977 pes->buffer = av_buffer_alloc(pes->total_size +
978 FF_INPUT_BUFFER_PADDING_SIZE);
980 return AVERROR(ENOMEM);
982 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
983 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
984 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
985 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
986 pes->state = MPEGTS_PESHEADER;
987 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
989 "pid=%x stream_type=%x probing\n",
992 pes->st->request_probe = 1;
995 pes->state = MPEGTS_PAYLOAD;
999 /* otherwise, it should be a table */
1002 pes->state = MPEGTS_SKIP;
1007 /**********************************************/
1008 /* PES packing parsing */
1009 case MPEGTS_PESHEADER:
1010 len = PES_HEADER_SIZE - pes->data_index;
1012 return AVERROR_INVALIDDATA;
1015 memcpy(pes->header + pes->data_index, p, len);
1016 pes->data_index += len;
1019 if (pes->data_index == PES_HEADER_SIZE) {
1020 pes->pes_header_size = pes->header[8] + 9;
1021 pes->state = MPEGTS_PESHEADER_FILL;
1024 case MPEGTS_PESHEADER_FILL:
1025 len = pes->pes_header_size - pes->data_index;
1027 return AVERROR_INVALIDDATA;
1030 memcpy(pes->header + pes->data_index, p, len);
1031 pes->data_index += len;
1034 if (pes->data_index == pes->pes_header_size) {
1036 unsigned int flags, pes_ext, skip;
1038 flags = pes->header[7];
1039 r = pes->header + 9;
1040 pes->pts = AV_NOPTS_VALUE;
1041 pes->dts = AV_NOPTS_VALUE;
1042 if ((flags & 0xc0) == 0x80) {
1043 pes->dts = pes->pts = ff_parse_pes_pts(r);
1045 } else if ((flags & 0xc0) == 0xc0) {
1046 pes->pts = ff_parse_pes_pts(r);
1048 pes->dts = ff_parse_pes_pts(r);
1051 pes->extended_stream_id = -1;
1052 if (flags & 0x01) { /* PES extension */
1054 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1055 skip = (pes_ext >> 4) & 0xb;
1058 if ((pes_ext & 0x41) == 0x01 &&
1059 (r + 2) <= (pes->header + pes->pes_header_size)) {
1060 /* PES extension 2 */
1061 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1062 pes->extended_stream_id = r[1];
1066 /* we got the full header. We parse it and get the payload */
1067 pes->state = MPEGTS_PAYLOAD;
1068 pes->data_index = 0;
1069 if (pes->stream_type == 0x12 && buf_size > 0) {
1070 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1072 pes->pes_header_size += sl_header_bytes;
1073 p += sl_header_bytes;
1074 buf_size -= sl_header_bytes;
1076 if (pes->stream_type == 0x15 && buf_size >= 5) {
1077 /* skip metadata access unit header */
1078 pes->pes_header_size += 5;
1082 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1083 AVProgram *p = NULL;
1084 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1085 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1086 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1088 AVStream *st = NULL;
1089 if (f->type == MPEGTS_PES) {
1090 PESContext *pcrpes = f->u.pes_filter.opaque;
1093 } else if (f->type == MPEGTS_PCR) {
1095 for (i = 0; i < p->nb_stream_indexes; i++) {
1096 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1097 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1101 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1102 // teletext packets do not always have correct timestamps,
1103 // the standard says they should be handled after 40.6 ms at most,
1104 // and the pcr error to this packet should be no more than 100 ms.
1105 // TODO: we should interpolate the PCR, not just use the last one
1106 int64_t pcr = f->last_pcr / 300;
1107 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1108 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1109 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1110 pes->pts = pes->dts = pcr;
1111 } else if (pes->dts > pcr + 3654 + 9000) {
1112 pes->pts = pes->dts = pcr + 3654 + 9000;
1122 case MPEGTS_PAYLOAD:
1124 if (pes->data_index > 0 &&
1125 pes->data_index + buf_size > pes->total_size) {
1126 new_pes_packet(pes, ts->pkt);
1127 pes->total_size = MAX_PES_PAYLOAD;
1128 pes->buffer = av_buffer_alloc(pes->total_size +
1129 FF_INPUT_BUFFER_PADDING_SIZE);
1131 return AVERROR(ENOMEM);
1133 } else if (pes->data_index == 0 &&
1134 buf_size > pes->total_size) {
1135 // pes packet size is < ts size packet and pes data is padded with 0xff
1136 // not sure if this is legal in ts but see issue #2392
1137 buf_size = pes->total_size;
1139 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1140 pes->data_index += buf_size;
1141 /* emit complete packets with known packet size
1142 * decreases demuxer delay for infrequent packets like subtitles from
1143 * a couple of seconds to milliseconds for properly muxed files.
1144 * total_size is the number of bytes following pes_packet_length
1145 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1146 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1147 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1149 new_pes_packet(pes, ts->pkt);
1163 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1168 /* if no pid found, then add a pid context */
1169 pes = av_mallocz(sizeof(PESContext));
1173 pes->stream = ts->stream;
1175 pes->pcr_pid = pcr_pid;
1176 pes->state = MPEGTS_SKIP;
1177 pes->pts = AV_NOPTS_VALUE;
1178 pes->dts = AV_NOPTS_VALUE;
1179 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1192 Mp4Descr *active_descr;
1194 int max_descr_count;
1196 int predefined_SLConfigDescriptor_seen;
1197 } MP4DescrParseContext;
1199 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1200 const uint8_t *buf, unsigned size,
1201 Mp4Descr *descr, int max_descr_count)
1204 if (size > (1 << 30))
1205 return AVERROR_INVALIDDATA;
1207 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1208 NULL, NULL, NULL, NULL)) < 0)
1215 d->active_descr = NULL;
1216 d->max_descr_count = max_descr_count;
1221 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1223 int64_t new_off = avio_tell(pb);
1224 (*len) -= new_off - *off;
1228 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1231 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1234 int ret = parse_mp4_descr(d, off, len, 0);
1237 update_offsets(&d->pb, &off, &len);
1242 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1244 avio_rb16(&d->pb); // ID
1250 update_offsets(&d->pb, &off, &len);
1251 return parse_mp4_descr_arr(d, off, len);
1254 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1259 id_flags = avio_rb16(&d->pb);
1260 if (!(id_flags & 0x0020)) { // URL_Flag
1261 update_offsets(&d->pb, &off, &len);
1262 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1268 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1271 if (d->descr_count >= d->max_descr_count)
1272 return AVERROR_INVALIDDATA;
1273 ff_mp4_parse_es_descr(&d->pb, &es_id);
1274 d->active_descr = d->descr + (d->descr_count++);
1276 d->active_descr->es_id = es_id;
1277 update_offsets(&d->pb, &off, &len);
1278 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1279 update_offsets(&d->pb, &off, &len);
1281 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1282 d->active_descr = NULL;
1286 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1289 Mp4Descr *descr = d->active_descr;
1291 return AVERROR_INVALIDDATA;
1292 d->active_descr->dec_config_descr = av_malloc(len);
1293 if (!descr->dec_config_descr)
1294 return AVERROR(ENOMEM);
1295 descr->dec_config_descr_len = len;
1296 avio_read(&d->pb, descr->dec_config_descr, len);
1300 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1302 Mp4Descr *descr = d->active_descr;
1305 return AVERROR_INVALIDDATA;
1307 predefined = avio_r8(&d->pb);
1310 int flags = avio_r8(&d->pb);
1311 descr->sl.use_au_start = !!(flags & 0x80);
1312 descr->sl.use_au_end = !!(flags & 0x40);
1313 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1314 descr->sl.use_padding = !!(flags & 0x08);
1315 descr->sl.use_timestamps = !!(flags & 0x04);
1316 descr->sl.use_idle = !!(flags & 0x02);
1317 descr->sl.timestamp_res = avio_rb32(&d->pb);
1319 descr->sl.timestamp_len = avio_r8(&d->pb);
1320 if (descr->sl.timestamp_len > 64) {
1321 avpriv_request_sample(NULL, "timestamp_len > 64");
1322 descr->sl.timestamp_len = 64;
1323 return AVERROR_PATCHWELCOME;
1325 descr->sl.ocr_len = avio_r8(&d->pb);
1326 descr->sl.au_len = avio_r8(&d->pb);
1327 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1328 lengths = avio_rb16(&d->pb);
1329 descr->sl.degr_prior_len = lengths >> 12;
1330 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1331 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1332 } else if (!d->predefined_SLConfigDescriptor_seen){
1333 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1334 d->predefined_SLConfigDescriptor_seen = 1;
1339 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1343 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1344 update_offsets(&d->pb, &off, &len);
1345 if (len < 0 || len1 > len || len1 <= 0) {
1346 av_log(d->s, AV_LOG_ERROR,
1347 "Tag %x length violation new length %d bytes remaining %d\n",
1349 return AVERROR_INVALIDDATA;
1352 if (d->level++ >= MAX_LEVEL) {
1353 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1357 if (target_tag && tag != target_tag) {
1358 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1365 parse_MP4IODescrTag(d, off, len1);
1368 parse_MP4ODescrTag(d, off, len1);
1371 parse_MP4ESDescrTag(d, off, len1);
1373 case MP4DecConfigDescrTag:
1374 parse_MP4DecConfigDescrTag(d, off, len1);
1377 parse_MP4SLDescrTag(d, off, len1);
1384 avio_seek(&d->pb, off + len1, SEEK_SET);
1388 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1389 Mp4Descr *descr, int *descr_count, int max_descr_count)
1391 MP4DescrParseContext d;
1394 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1398 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1400 *descr_count = d.descr_count;
1404 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1405 Mp4Descr *descr, int *descr_count, int max_descr_count)
1407 MP4DescrParseContext d;
1410 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1414 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1416 *descr_count = d.descr_count;
1420 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1423 MpegTSContext *ts = filter->u.section_filter.opaque;
1425 const uint8_t *p, *p_end;
1427 int mp4_descr_count = 0;
1428 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1430 AVFormatContext *s = ts->stream;
1432 p_end = section + section_len - 4;
1434 if (parse_section_header(&h, &p, p_end) < 0)
1436 if (h.tid != M4OD_TID)
1439 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1440 MAX_MP4_DESCR_COUNT);
1442 for (pid = 0; pid < NB_PID_MAX; pid++) {
1445 for (i = 0; i < mp4_descr_count; i++) {
1448 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1450 if (ts->pids[pid]->type != MPEGTS_PES) {
1451 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1454 pes = ts->pids[pid]->u.pes_filter.opaque;
1459 pes->sl = mp4_descr[i].sl;
1461 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1462 mp4_descr[i].dec_config_descr_len, 0,
1463 NULL, NULL, NULL, NULL);
1464 ff_mp4_read_dec_config_descr(s, st, &pb);
1465 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1466 st->codec->extradata_size > 0)
1467 st->need_parsing = 0;
1468 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1469 st->codec->extradata_size > 0)
1470 st->need_parsing = 0;
1472 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1474 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1475 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1476 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1477 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1478 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1479 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1482 for (i = 0; i < mp4_descr_count; i++)
1483 av_free(mp4_descr[i].dec_config_descr);
1486 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1487 const uint8_t **pp, const uint8_t *desc_list_end,
1488 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1491 const uint8_t *desc_end;
1492 int desc_len, desc_tag, desc_es_id;
1496 desc_tag = get8(pp, desc_list_end);
1498 return AVERROR_INVALIDDATA;
1499 desc_len = get8(pp, desc_list_end);
1501 return AVERROR_INVALIDDATA;
1502 desc_end = *pp + desc_len;
1503 if (desc_end > desc_list_end)
1504 return AVERROR_INVALIDDATA;
1506 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1508 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1509 stream_type == STREAM_TYPE_PRIVATE_DATA)
1510 mpegts_find_stream_type(st, desc_tag, DESC_types);
1513 case 0x1E: /* SL descriptor */
1514 desc_es_id = get16(pp, desc_end);
1515 if (ts && ts->pids[pid])
1516 ts->pids[pid]->es_id = desc_es_id;
1517 for (i = 0; i < mp4_descr_count; i++)
1518 if (mp4_descr[i].dec_config_descr_len &&
1519 mp4_descr[i].es_id == desc_es_id) {
1521 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1522 mp4_descr[i].dec_config_descr_len, 0,
1523 NULL, NULL, NULL, NULL);
1524 ff_mp4_read_dec_config_descr(fc, st, &pb);
1525 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1526 st->codec->extradata_size > 0)
1527 st->need_parsing = 0;
1528 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1529 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1532 case 0x1F: /* FMC descriptor */
1533 get16(pp, desc_end);
1534 if (mp4_descr_count > 0 &&
1535 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1536 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1538 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1539 mp4_descr->dec_config_descr_len, 0,
1540 NULL, NULL, NULL, NULL);
1541 ff_mp4_read_dec_config_descr(fc, st, &pb);
1542 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1543 st->codec->extradata_size > 0) {
1544 st->request_probe = st->need_parsing = 0;
1545 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1549 case 0x56: /* DVB teletext descriptor */
1551 uint8_t *extradata = NULL;
1552 int language_count = desc_len / 5;
1554 if (desc_len > 0 && desc_len % 5 != 0)
1555 return AVERROR_INVALIDDATA;
1557 if (language_count > 0) {
1558 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1559 if (language_count > sizeof(language) / 4) {
1560 language_count = sizeof(language) / 4;
1563 if (st->codec->extradata == NULL) {
1564 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1565 return AVERROR(ENOMEM);
1569 if (st->codec->extradata_size < language_count * 2)
1570 return AVERROR_INVALIDDATA;
1572 extradata = st->codec->extradata;
1574 for (i = 0; i < language_count; i++) {
1575 language[i * 4 + 0] = get8(pp, desc_end);
1576 language[i * 4 + 1] = get8(pp, desc_end);
1577 language[i * 4 + 2] = get8(pp, desc_end);
1578 language[i * 4 + 3] = ',';
1580 memcpy(extradata, *pp, 2);
1586 language[i * 4 - 1] = 0;
1587 av_dict_set(&st->metadata, "language", language, 0);
1591 case 0x59: /* subtitling descriptor */
1593 /* 8 bytes per DVB subtitle substream data:
1594 * ISO_639_language_code (3 bytes),
1595 * subtitling_type (1 byte),
1596 * composition_page_id (2 bytes),
1597 * ancillary_page_id (2 bytes) */
1598 int language_count = desc_len / 8;
1600 if (desc_len > 0 && desc_len % 8 != 0)
1601 return AVERROR_INVALIDDATA;
1603 if (language_count > 1) {
1604 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1607 if (language_count > 0) {
1610 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1611 if (language_count > sizeof(language) / 4) {
1612 language_count = sizeof(language) / 4;
1615 if (st->codec->extradata == NULL) {
1616 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1617 return AVERROR(ENOMEM);
1621 if (st->codec->extradata_size < language_count * 5)
1622 return AVERROR_INVALIDDATA;
1624 extradata = st->codec->extradata;
1626 for (i = 0; i < language_count; i++) {
1627 language[i * 4 + 0] = get8(pp, desc_end);
1628 language[i * 4 + 1] = get8(pp, desc_end);
1629 language[i * 4 + 2] = get8(pp, desc_end);
1630 language[i * 4 + 3] = ',';
1632 /* hearing impaired subtitles detection using subtitling_type */
1634 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1635 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1636 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1637 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1638 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1639 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1640 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1644 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1645 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1651 language[i * 4 - 1] = 0;
1652 av_dict_set(&st->metadata, "language", language, 0);
1656 case 0x0a: /* ISO 639 language descriptor */
1657 for (i = 0; i + 4 <= desc_len; i += 4) {
1658 language[i + 0] = get8(pp, desc_end);
1659 language[i + 1] = get8(pp, desc_end);
1660 language[i + 2] = get8(pp, desc_end);
1661 language[i + 3] = ',';
1662 switch (get8(pp, desc_end)) {
1664 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1667 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1670 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1675 language[i - 1] = 0;
1676 av_dict_set(&st->metadata, "language", language, 0);
1679 case 0x05: /* registration descriptor */
1680 st->codec->codec_tag = bytestream_get_le32(pp);
1681 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1682 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1683 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1685 case 0x52: /* stream identifier descriptor */
1686 st->stream_identifier = 1 + get8(pp, desc_end);
1688 case 0x26: /* metadata descriptor */
1689 if (get16(pp, desc_end) == 0xFFFF)
1691 if (get8(pp, desc_end) == 0xFF) {
1692 st->codec->codec_tag = bytestream_get_le32(pp);
1693 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1694 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1704 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1706 MpegTSContext *ts = filter->u.section_filter.opaque;
1707 SectionHeader h1, *h = &h1;
1710 const uint8_t *p, *p_end, *desc_list_end;
1711 int program_info_length, pcr_pid, pid, stream_type;
1713 uint32_t prog_reg_desc = 0; /* registration descriptor */
1715 int mp4_descr_count = 0;
1716 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1719 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1720 hex_dump_debug(ts->stream, section, section_len);
1722 p_end = section + section_len - 4;
1724 if (parse_section_header(h, &p, p_end) < 0)
1727 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1728 h->id, h->sec_num, h->last_sec_num);
1730 if (h->tid != PMT_TID)
1732 if (ts->skip_changes)
1735 clear_program(ts, h->id);
1736 pcr_pid = get16(&p, p_end);
1740 add_pid_to_pmt(ts, h->id, pcr_pid);
1741 set_pcr_pid(ts->stream, h->id, pcr_pid);
1743 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1745 program_info_length = get16(&p, p_end);
1746 if (program_info_length < 0)
1748 program_info_length &= 0xfff;
1749 while (program_info_length >= 2) {
1751 tag = get8(&p, p_end);
1752 len = get8(&p, p_end);
1754 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1756 if (len > program_info_length - 2)
1757 // something else is broken, exit the program_descriptors_loop
1759 program_info_length -= len + 2;
1760 if (tag == 0x1d) { // IOD descriptor
1761 get8(&p, p_end); // scope
1762 get8(&p, p_end); // label
1764 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1765 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1766 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1767 prog_reg_desc = bytestream_get_le32(&p);
1772 p += program_info_length;
1776 // stop parsing after pmt, we found header
1777 if (!ts->stream->nb_streams)
1780 set_pmt_found(ts, h->id);
1786 stream_type = get8(&p, p_end);
1787 if (stream_type < 0)
1789 pid = get16(&p, p_end);
1793 if (pid == ts->current_pid)
1796 /* now create stream */
1797 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1798 pes = ts->pids[pid]->u.pes_filter.opaque;
1800 pes->st = avformat_new_stream(pes->stream, NULL);
1803 pes->st->id = pes->pid;
1806 } else if (stream_type != 0x13) {
1808 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1809 pes = add_pes_stream(ts, pid, pcr_pid);
1811 st = avformat_new_stream(pes->stream, NULL);
1817 int idx = ff_find_stream_index(ts->stream, pid);
1819 st = ts->stream->streams[idx];
1821 st = avformat_new_stream(ts->stream, NULL);
1825 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1832 if (pes && !pes->stream_type)
1833 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1835 add_pid_to_pmt(ts, h->id, pid);
1837 ff_program_add_stream_index(ts->stream, h->id, st->index);
1839 desc_list_len = get16(&p, p_end);
1840 if (desc_list_len < 0)
1842 desc_list_len &= 0xfff;
1843 desc_list_end = p + desc_list_len;
1844 if (desc_list_end > p_end)
1847 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1848 desc_list_end, mp4_descr,
1849 mp4_descr_count, pid, ts) < 0)
1852 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1853 stream_type == 0x83 && pes->sub_st) {
1854 ff_program_add_stream_index(ts->stream, h->id,
1855 pes->sub_st->index);
1856 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1862 if (!ts->pids[pcr_pid])
1863 mpegts_open_pcr_filter(ts, pcr_pid);
1866 for (i = 0; i < mp4_descr_count; i++)
1867 av_free(mp4_descr[i].dec_config_descr);
1870 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1872 MpegTSContext *ts = filter->u.section_filter.opaque;
1873 SectionHeader h1, *h = &h1;
1874 const uint8_t *p, *p_end;
1878 av_dlog(ts->stream, "PAT:\n");
1879 hex_dump_debug(ts->stream, section, section_len);
1881 p_end = section + section_len - 4;
1883 if (parse_section_header(h, &p, p_end) < 0)
1885 if (h->tid != PAT_TID)
1887 if (ts->skip_changes)
1890 ts->stream->ts_id = h->id;
1894 sid = get16(&p, p_end);
1897 pmt_pid = get16(&p, p_end);
1902 if (pmt_pid == ts->current_pid)
1905 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1907 if (sid == 0x0000) {
1910 MpegTSFilter *fil = ts->pids[pmt_pid];
1911 program = av_new_program(ts->stream, sid);
1912 program->program_num = sid;
1913 program->pmt_pid = pmt_pid;
1915 if ( fil->type != MPEGTS_SECTION
1916 || fil->pid != pmt_pid
1917 || fil->u.section_filter.section_cb != pmt_cb)
1918 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1920 if (!ts->pids[pmt_pid])
1921 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1922 add_pat_entry(ts, sid);
1923 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1924 add_pid_to_pmt(ts, sid, pmt_pid);
1930 for (j=0; j<ts->stream->nb_programs; j++) {
1931 for (i = 0; i < ts->nb_prg; i++)
1932 if (ts->prg[i].id == ts->stream->programs[j]->id)
1935 clear_avprogram(ts, ts->stream->programs[j]->id);
1940 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1942 MpegTSContext *ts = filter->u.section_filter.opaque;
1943 SectionHeader h1, *h = &h1;
1944 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1945 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1946 char *name, *provider_name;
1948 av_dlog(ts->stream, "SDT:\n");
1949 hex_dump_debug(ts->stream, section, section_len);
1951 p_end = section + section_len - 4;
1953 if (parse_section_header(h, &p, p_end) < 0)
1955 if (h->tid != SDT_TID)
1957 if (ts->skip_changes)
1959 onid = get16(&p, p_end);
1962 val = get8(&p, p_end);
1966 sid = get16(&p, p_end);
1969 val = get8(&p, p_end);
1972 desc_list_len = get16(&p, p_end);
1973 if (desc_list_len < 0)
1975 desc_list_len &= 0xfff;
1976 desc_list_end = p + desc_list_len;
1977 if (desc_list_end > p_end)
1980 desc_tag = get8(&p, desc_list_end);
1983 desc_len = get8(&p, desc_list_end);
1984 desc_end = p + desc_len;
1985 if (desc_end > desc_list_end)
1988 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1989 desc_tag, desc_len);
1993 service_type = get8(&p, p_end);
1994 if (service_type < 0)
1996 provider_name = getstr8(&p, p_end);
1999 name = getstr8(&p, p_end);
2001 AVProgram *program = av_new_program(ts->stream, sid);
2003 av_dict_set(&program->metadata, "service_name", name, 0);
2004 av_dict_set(&program->metadata, "service_provider",
2009 av_free(provider_name);
2020 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2021 const uint8_t *packet);
2023 /* handle one TS packet */
2024 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2027 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2028 has_adaptation, has_payload;
2029 const uint8_t *p, *p_end;
2032 pid = AV_RB16(packet + 1) & 0x1fff;
2033 if (pid && discard_pid(ts, pid))
2035 is_start = packet[1] & 0x40;
2036 tss = ts->pids[pid];
2037 if (ts->auto_guess && tss == NULL && is_start) {
2038 add_pes_stream(ts, pid, -1);
2039 tss = ts->pids[pid];
2043 ts->current_pid = pid;
2045 afc = (packet[3] >> 4) & 3;
2046 if (afc == 0) /* reserved value */
2048 has_adaptation = afc & 2;
2049 has_payload = afc & 1;
2050 is_discontinuity = has_adaptation &&
2051 packet[4] != 0 && /* with length > 0 */
2052 (packet[5] & 0x80); /* and discontinuity indicated */
2054 /* continuity check (currently not used) */
2055 cc = (packet[3] & 0xf);
2056 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2057 cc_ok = pid == 0x1FFF || // null packet PID
2064 av_log(ts->stream, AV_LOG_DEBUG,
2065 "Continuity check failed for pid %d expected %d got %d\n",
2066 pid, expected_cc, cc);
2067 if (tss->type == MPEGTS_PES) {
2068 PESContext *pc = tss->u.pes_filter.opaque;
2069 pc->flags |= AV_PKT_FLAG_CORRUPT;
2073 if (!has_payload && tss->type != MPEGTS_PCR)
2076 if (has_adaptation) {
2077 /* skip adaptation field */
2080 /* if past the end of packet, ignore */
2081 p_end = packet + TS_PACKET_SIZE;
2082 if (p > p_end || (p == p_end && tss->type != MPEGTS_PCR))
2085 pos = avio_tell(ts->stream->pb);
2087 av_assert0(pos >= TS_PACKET_SIZE);
2088 ts->pos47_full = pos - TS_PACKET_SIZE;
2091 if (tss->type == MPEGTS_SECTION) {
2093 /* pointer field present */
2095 if (p + len > p_end)
2098 /* write remaining section bytes */
2099 write_section_data(ts, tss,
2101 /* check whether filter has been closed */
2107 write_section_data(ts, tss,
2112 write_section_data(ts, tss,
2117 // stop find_stream_info from waiting for more streams
2118 // when all programs have received a PMT
2119 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2121 for (i = 0; i < ts->nb_prg; i++) {
2122 if (!ts->prg[i].pmt_found)
2125 if (i == ts->nb_prg && ts->nb_prg > 0) {
2126 if (ts->stream->nb_streams > 1 || pos > 100000) {
2127 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2128 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2137 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2138 tss->last_pcr = pcr_h * 300 + pcr_l;
2139 // Note: The position here points actually behind the current packet.
2140 if (tss->type == MPEGTS_PES) {
2141 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2142 pos - ts->raw_packet_size)) < 0)
2150 static void reanalyze(MpegTSContext *ts) {
2151 AVIOContext *pb = ts->stream->pb;
2152 int64_t pos = avio_tell(pb);
2155 pos -= ts->pos47_full;
2156 if (pos == TS_PACKET_SIZE) {
2157 ts->size_stat[0] ++;
2158 } else if (pos == TS_DVHS_PACKET_SIZE) {
2159 ts->size_stat[1] ++;
2160 } else if (pos == TS_FEC_PACKET_SIZE) {
2161 ts->size_stat[2] ++;
2164 ts->size_stat_count ++;
2165 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2167 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2168 newsize = TS_PACKET_SIZE;
2169 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2170 newsize = TS_DVHS_PACKET_SIZE;
2171 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2172 newsize = TS_FEC_PACKET_SIZE;
2174 if (newsize && newsize != ts->raw_packet_size) {
2175 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2176 ts->raw_packet_size = newsize;
2178 ts->size_stat_count = 0;
2179 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2183 /* XXX: try to find a better synchro over several packets (use
2184 * get_packet_size() ?) */
2185 static int mpegts_resync(AVFormatContext *s)
2187 AVIOContext *pb = s->pb;
2190 for (i = 0; i < MAX_RESYNC_SIZE; i++) {
2195 avio_seek(pb, -1, SEEK_CUR);
2196 reanalyze(s->priv_data);
2200 av_log(s, AV_LOG_ERROR,
2201 "max resync size reached, could not find sync byte\n");
2203 return AVERROR_INVALIDDATA;
2206 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2207 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2208 const uint8_t **data)
2210 AVIOContext *pb = s->pb;
2214 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2215 if (len != TS_PACKET_SIZE)
2216 return len < 0 ? len : AVERROR_EOF;
2217 /* check packet sync byte */
2218 if ((*data)[0] != 0x47) {
2219 /* find a new packet start */
2220 uint64_t pos = avio_tell(pb);
2221 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2223 if (mpegts_resync(s) < 0)
2224 return AVERROR(EAGAIN);
2234 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2236 AVIOContext *pb = s->pb;
2237 int skip = raw_packet_size - TS_PACKET_SIZE;
2239 avio_skip(pb, skip);
2242 static int handle_packets(MpegTSContext *ts, int nb_packets)
2244 AVFormatContext *s = ts->stream;
2245 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2246 const uint8_t *data;
2247 int packet_num, ret = 0;
2249 if (avio_tell(s->pb) != ts->last_pos) {
2251 av_dlog(ts->stream, "Skipping after seek\n");
2252 /* seek detected, flush pes buffer */
2253 for (i = 0; i < NB_PID_MAX; i++) {
2255 if (ts->pids[i]->type == MPEGTS_PES) {
2256 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2257 av_buffer_unref(&pes->buffer);
2258 pes->data_index = 0;
2259 pes->state = MPEGTS_SKIP; /* skip until pes header */
2261 ts->pids[i]->last_cc = -1;
2262 ts->pids[i]->last_pcr = -1;
2269 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2272 if (nb_packets != 0 && packet_num >= nb_packets ||
2273 ts->stop_parse > 1) {
2274 ret = AVERROR(EAGAIN);
2277 if (ts->stop_parse > 0)
2280 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2283 ret = handle_packet(ts, data);
2284 finished_reading_packet(s, ts->raw_packet_size);
2288 ts->last_pos = avio_tell(s->pb);
2292 static int mpegts_probe(AVProbeData *p)
2294 const int size = p->buf_size;
2298 int check_count = size / TS_FEC_PACKET_SIZE;
2299 #define CHECK_COUNT 10
2300 #define CHECK_BLOCK 100
2302 if (check_count < CHECK_COUNT)
2303 return AVERROR_INVALIDDATA;
2305 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2306 int left = FFMIN(check_count - i, CHECK_BLOCK);
2307 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2308 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2309 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2310 score = FFMAX3(score, dvhs_score, fec_score);
2312 maxscore = FFMAX(maxscore, score);
2315 sumscore = sumscore * CHECK_COUNT / check_count;
2316 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2318 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2320 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2321 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2323 return AVERROR_INVALIDDATA;
2326 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2327 * (-1) if not available */
2328 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2330 int afc, len, flags;
2334 afc = (packet[3] >> 4) & 3;
2336 return AVERROR_INVALIDDATA;
2341 return AVERROR_INVALIDDATA;
2344 if (!(flags & 0x10))
2345 return AVERROR_INVALIDDATA;
2347 return AVERROR_INVALIDDATA;
2349 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2350 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2354 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2356 /* NOTE: We attempt to seek on non-seekable files as well, as the
2357 * probe buffer usually is big enough. Only warn if the seek failed
2358 * on files where the seek should work. */
2359 if (avio_seek(pb, pos, SEEK_SET) < 0)
2360 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2363 static int mpegts_read_header(AVFormatContext *s)
2365 MpegTSContext *ts = s->priv_data;
2366 AVIOContext *pb = s->pb;
2367 uint8_t buf[8 * 1024] = {0};
2371 ffio_ensure_seekback(pb, s->probesize);
2373 /* read the first 8192 bytes to get packet size */
2374 pos = avio_tell(pb);
2375 len = avio_read(pb, buf, sizeof(buf));
2376 ts->raw_packet_size = get_packet_size(buf, len);
2377 if (ts->raw_packet_size <= 0) {
2378 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2379 ts->raw_packet_size = TS_PACKET_SIZE;
2384 if (s->iformat == &ff_mpegts_demuxer) {
2387 /* first do a scan to get all the services */
2388 seek_back(s, pb, pos);
2390 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2392 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2394 handle_packets(ts, s->probesize / ts->raw_packet_size);
2395 /* if could not find service, enable auto_guess */
2399 av_dlog(ts->stream, "tuning done\n");
2401 s->ctx_flags |= AVFMTCTX_NOHEADER;
2404 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2405 int64_t pcrs[2], pcr_h;
2406 int packet_count[2];
2407 uint8_t packet[TS_PACKET_SIZE];
2408 const uint8_t *data;
2410 /* only read packets */
2412 st = avformat_new_stream(s, NULL);
2414 return AVERROR(ENOMEM);
2415 avpriv_set_pts_info(st, 60, 1, 27000000);
2416 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2417 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2419 /* we iterate until we find two PCRs to estimate the bitrate */
2424 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2427 pid = AV_RB16(data + 1) & 0x1fff;
2428 if ((pcr_pid == -1 || pcr_pid == pid) &&
2429 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2430 finished_reading_packet(s, ts->raw_packet_size);
2432 packet_count[nb_pcrs] = nb_packets;
2433 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2438 finished_reading_packet(s, ts->raw_packet_size);
2443 /* NOTE1: the bitrate is computed without the FEC */
2444 /* NOTE2: it is only the bitrate of the start of the stream */
2445 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2446 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2447 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2448 st->codec->bit_rate = s->bit_rate;
2449 st->start_time = ts->cur_pcr;
2450 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2451 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2454 seek_back(s, pb, pos);
2458 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2460 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2462 MpegTSContext *ts = s->priv_data;
2464 int64_t pcr_h, next_pcr_h, pos;
2465 int pcr_l, next_pcr_l;
2466 uint8_t pcr_buf[12];
2467 const uint8_t *data;
2469 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2470 return AVERROR(ENOMEM);
2471 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2472 pkt->pos = avio_tell(s->pb);
2474 av_free_packet(pkt);
2477 if (data != pkt->data)
2478 memcpy(pkt->data, data, ts->raw_packet_size);
2479 finished_reading_packet(s, ts->raw_packet_size);
2480 if (ts->mpeg2ts_compute_pcr) {
2481 /* compute exact PCR for each packet */
2482 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2483 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2484 pos = avio_tell(s->pb);
2485 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2486 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2487 avio_read(s->pb, pcr_buf, 12);
2488 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2489 /* XXX: not precise enough */
2491 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2496 avio_seek(s->pb, pos, SEEK_SET);
2497 /* no next PCR found: we use previous increment */
2498 ts->cur_pcr = pcr_h * 300 + pcr_l;
2500 pkt->pts = ts->cur_pcr;
2501 pkt->duration = ts->pcr_incr;
2502 ts->cur_pcr += ts->pcr_incr;
2504 pkt->stream_index = 0;
2508 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2510 MpegTSContext *ts = s->priv_data;
2515 ret = handle_packets(ts, 0);
2517 av_free_packet(ts->pkt);
2518 /* flush pes data left */
2519 for (i = 0; i < NB_PID_MAX; i++)
2520 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2521 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2522 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2523 new_pes_packet(pes, pkt);
2524 pes->state = MPEGTS_SKIP;
2531 if (!ret && pkt->size < 0)
2532 ret = AVERROR(EINTR);
2536 static void mpegts_free(MpegTSContext *ts)
2542 for (i = 0; i < NB_PID_MAX; i++)
2544 mpegts_close_filter(ts, ts->pids[i]);
2547 static int mpegts_read_close(AVFormatContext *s)
2549 MpegTSContext *ts = s->priv_data;
2554 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2555 int64_t *ppos, int64_t pos_limit)
2557 MpegTSContext *ts = s->priv_data;
2558 int64_t pos, timestamp;
2559 uint8_t buf[TS_PACKET_SIZE];
2560 int pcr_l, pcr_pid =
2561 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2562 int pos47 = ts->pos47_full % ts->raw_packet_size;
2564 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2565 ts->raw_packet_size + pos47;
2566 while(pos < pos_limit) {
2567 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2568 return AV_NOPTS_VALUE;
2569 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2570 return AV_NOPTS_VALUE;
2571 if (buf[0] != 0x47) {
2572 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2573 if (mpegts_resync(s) < 0)
2574 return AV_NOPTS_VALUE;
2575 pos = avio_tell(s->pb);
2578 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2579 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2583 pos += ts->raw_packet_size;
2586 return AV_NOPTS_VALUE;
2589 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2590 int64_t *ppos, int64_t pos_limit)
2592 MpegTSContext *ts = s->priv_data;
2594 int pos47 = ts->pos47_full % ts->raw_packet_size;
2595 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2596 ff_read_frame_flush(s);
2597 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2598 return AV_NOPTS_VALUE;
2599 while(pos < pos_limit) {
2602 av_init_packet(&pkt);
2603 ret = av_read_frame(s, &pkt);
2605 return AV_NOPTS_VALUE;
2606 av_free_packet(&pkt);
2607 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2608 ff_reduce_index(s, pkt.stream_index);
2609 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2610 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2618 return AV_NOPTS_VALUE;
2621 /**************************************************************/
2622 /* parsing functions - called from other demuxers such as RTP */
2624 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2628 ts = av_mallocz(sizeof(MpegTSContext));
2631 /* no stream case, currently used by RTP */
2632 ts->raw_packet_size = TS_PACKET_SIZE;
2635 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2636 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2641 /* return the consumed length if a packet was output, or -1 if no
2642 * packet is output */
2643 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2644 const uint8_t *buf, int len)
2652 if (len < TS_PACKET_SIZE)
2653 return AVERROR_INVALIDDATA;
2654 if (buf[0] != 0x47) {
2658 handle_packet(ts, buf);
2659 buf += TS_PACKET_SIZE;
2660 len -= TS_PACKET_SIZE;
2661 if (ts->stop_parse == 1)
2668 void ff_mpegts_parse_close(MpegTSContext *ts)
2674 AVInputFormat ff_mpegts_demuxer = {
2676 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2677 .priv_data_size = sizeof(MpegTSContext),
2678 .read_probe = mpegts_probe,
2679 .read_header = mpegts_read_header,
2680 .read_packet = mpegts_read_packet,
2681 .read_close = mpegts_read_close,
2682 .read_timestamp = mpegts_get_dts,
2683 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2684 .priv_class = &mpegts_class,
2687 AVInputFormat ff_mpegtsraw_demuxer = {
2688 .name = "mpegtsraw",
2689 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2690 .priv_data_size = sizeof(MpegTSContext),
2691 .read_header = mpegts_read_header,
2692 .read_packet = mpegts_raw_read_packet,
2693 .read_close = mpegts_read_close,
2694 .read_timestamp = mpegts_get_dts,
2695 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2696 .priv_class = &mpegtsraw_class,