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/internal.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/avassert.h"
31 #include "libavcodec/bytestream.h"
32 #include "libavcodec/get_bits.h"
33 #include "libavcodec/opus.h"
37 #include "avio_internal.h"
41 /* maximum size in which we look for synchronisation if
42 * synchronisation is lost */
43 #define MAX_RESYNC_SIZE 65536
45 #define MAX_PES_PAYLOAD 200 * 1024
47 #define MAX_MP4_DESCR_COUNT 16
49 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
51 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
52 (modulus) = (dividend) % (divisor); \
53 (prev_dividend) = (dividend); \
56 enum MpegTSFilterType {
62 typedef struct MpegTSFilter MpegTSFilter;
64 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
65 int is_start, int64_t pos);
67 typedef struct MpegTSPESFilter {
72 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
74 typedef void SetServiceCallback (void *opaque, int ret);
76 typedef struct MpegTSSectionFilter {
83 unsigned int check_crc : 1;
84 unsigned int end_of_section_reached : 1;
85 SectionCallback *section_cb;
87 } MpegTSSectionFilter;
92 int last_cc; /* last cc code (-1 if first packet) */
94 enum MpegTSFilterType type;
96 MpegTSPESFilter pes_filter;
97 MpegTSSectionFilter section_filter;
101 #define MAX_PIDS_PER_PROGRAM 64
103 unsigned int id; // program id/service id
104 unsigned int nb_pids;
105 unsigned int pids[MAX_PIDS_PER_PROGRAM];
107 /** have we found pmt for this program */
111 struct MpegTSContext {
112 const AVClass *class;
114 AVFormatContext *stream;
115 /** raw packet size, including FEC if present */
120 #define SIZE_STAT_THRESHOLD 10
124 /** if true, all pids are analyzed to find streams */
127 /** compute exact PCR for each transport stream packet */
128 int mpeg2ts_compute_pcr;
130 /** fix dvb teletext pts */
131 int fix_teletext_pts;
133 int64_t cur_pcr; /**< used to estimate the exact PCR */
134 int pcr_incr; /**< used to estimate the exact PCR */
136 /* data needed to handle file based ts */
137 /** stop parsing loop */
139 /** packet containing Audio/Video data */
141 /** to detect seek */
151 /******************************************/
152 /* private mpegts data */
154 /** structure to keep track of Program->pids mapping */
158 int8_t crc_validity[NB_PID_MAX];
159 /** filters for various streams specified by PMT + for the PAT and PMT */
160 MpegTSFilter *pids[NB_PID_MAX];
164 #define MPEGTS_OPTIONS \
165 { "resync_size", "set size limit for looking up a new synchronization", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT, { .i64 = MAX_RESYNC_SIZE}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }
167 static const AVOption options[] = {
169 {"fix_teletext_pts", "try to fix pts values of dvb teletext streams", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_BOOL,
170 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
171 {"ts_packetsize", "output option carrying the raw packet size", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
172 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
173 {"scan_all_pmts", "scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_BOOL,
174 { .i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
175 {"skip_changes", "skip changing / adding streams / programs", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_BOOL,
176 {.i64 = 0}, 0, 1, 0 },
177 {"skip_clear", "skip clearing programs", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_BOOL,
178 {.i64 = 0}, 0, 1, 0 },
182 static const AVClass mpegts_class = {
183 .class_name = "mpegts demuxer",
184 .item_name = av_default_item_name,
186 .version = LIBAVUTIL_VERSION_INT,
189 static const AVOption raw_options[] = {
191 { "compute_pcr", "compute exact PCR for each transport stream packet",
192 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_BOOL,
193 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
194 { "ts_packetsize", "output option carrying the raw packet size",
195 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
197 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
201 static const AVClass mpegtsraw_class = {
202 .class_name = "mpegtsraw demuxer",
203 .item_name = av_default_item_name,
204 .option = raw_options,
205 .version = LIBAVUTIL_VERSION_INT,
208 /* TS stream handling */
213 MPEGTS_PESHEADER_FILL,
218 /* enough for PES header + length */
219 #define PES_START_SIZE 6
220 #define PES_HEADER_SIZE 9
221 #define MAX_PES_HEADER_SIZE (9 + 255)
223 typedef struct PESContext {
225 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
228 AVFormatContext *stream;
230 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
231 enum MpegTSState state;
232 /* used to get the format */
234 int flags; /**< copied to the AVPacket flags */
237 int extended_stream_id;
239 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
240 uint8_t header[MAX_PES_HEADER_SIZE];
245 extern AVInputFormat ff_mpegts_demuxer;
247 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
250 for (i = 0; i < ts->nb_prg; i++) {
251 if (ts->prg[i].id == programid) {
258 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
260 AVProgram *prg = NULL;
263 for (i = 0; i < ts->stream->nb_programs; i++)
264 if (ts->stream->programs[i]->id == programid) {
265 prg = ts->stream->programs[i];
270 prg->nb_stream_indexes = 0;
273 static void clear_program(MpegTSContext *ts, unsigned int programid)
277 clear_avprogram(ts, programid);
278 for (i = 0; i < ts->nb_prg; i++)
279 if (ts->prg[i].id == programid) {
280 ts->prg[i].nb_pids = 0;
281 ts->prg[i].pmt_found = 0;
285 static void clear_programs(MpegTSContext *ts)
291 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
294 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
298 p = &ts->prg[ts->nb_prg];
305 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
308 struct Program *p = get_program(ts, programid);
313 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
316 for (i = 0; i < p->nb_pids; i++)
317 if (p->pids[i] == pid)
320 p->pids[p->nb_pids++] = pid;
323 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
325 struct Program *p = get_program(ts, programid);
332 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
335 for (i = 0; i < s->nb_programs; i++) {
336 if (s->programs[i]->id == programid) {
337 s->programs[i]->pcr_pid = pid;
344 * @brief discard_pid() decides if the pid is to be discarded according
345 * to caller's programs selection
346 * @param ts : - TS context
348 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
351 static int discard_pid(MpegTSContext *ts, unsigned int pid)
354 int used = 0, discarded = 0;
357 /* If none of the programs have .discard=AVDISCARD_ALL then there's
358 * no way we have to discard this packet */
359 for (k = 0; k < ts->stream->nb_programs; k++)
360 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
362 if (k == ts->stream->nb_programs)
365 for (i = 0; i < ts->nb_prg; i++) {
367 for (j = 0; j < p->nb_pids; j++) {
368 if (p->pids[j] != pid)
370 // is program with id p->id set to be discarded?
371 for (k = 0; k < ts->stream->nb_programs; k++) {
372 if (ts->stream->programs[k]->id == p->id) {
373 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
382 return !used && discarded;
386 * Assemble PES packets out of TS packets, and then call the "section_cb"
387 * function when they are complete.
389 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
390 const uint8_t *buf, int buf_size, int is_start)
392 MpegTSSectionFilter *tss = &tss1->u.section_filter;
396 memcpy(tss->section_buf, buf, buf_size);
397 tss->section_index = buf_size;
398 tss->section_h_size = -1;
399 tss->end_of_section_reached = 0;
401 if (tss->end_of_section_reached)
403 len = 4096 - tss->section_index;
406 memcpy(tss->section_buf + tss->section_index, buf, len);
407 tss->section_index += len;
410 /* compute section length if possible */
411 if (tss->section_h_size == -1 && tss->section_index >= 3) {
412 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
415 tss->section_h_size = len;
418 if (tss->section_h_size != -1 &&
419 tss->section_index >= tss->section_h_size) {
421 tss->end_of_section_reached = 1;
423 if (tss->check_crc) {
424 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
425 if (tss->section_h_size >= 4)
426 tss->crc = AV_RB32(tss->section_buf + tss->section_h_size - 4);
429 ts->crc_validity[ tss1->pid ] = 100;
430 }else if (ts->crc_validity[ tss1->pid ] > -10) {
431 ts->crc_validity[ tss1->pid ]--;
436 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
443 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
444 enum MpegTSFilterType type)
446 MpegTSFilter *filter;
448 av_log(ts->stream, AV_LOG_TRACE, "Filter: pid=0x%x\n", pid);
450 if (pid >= NB_PID_MAX || ts->pids[pid])
452 filter = av_mallocz(sizeof(MpegTSFilter));
455 ts->pids[pid] = filter;
460 filter->last_cc = -1;
461 filter->last_pcr= -1;
466 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
468 SectionCallback *section_cb,
472 MpegTSFilter *filter;
473 MpegTSSectionFilter *sec;
475 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
477 sec = &filter->u.section_filter;
478 sec->section_cb = section_cb;
479 sec->opaque = opaque;
480 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
481 sec->check_crc = check_crc;
484 if (!sec->section_buf) {
491 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
495 MpegTSFilter *filter;
496 MpegTSPESFilter *pes;
498 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
501 pes = &filter->u.pes_filter;
502 pes->pes_cb = pes_cb;
503 pes->opaque = opaque;
507 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
509 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
512 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
517 if (filter->type == MPEGTS_SECTION)
518 av_freep(&filter->u.section_filter.section_buf);
519 else if (filter->type == MPEGTS_PES) {
520 PESContext *pes = filter->u.pes_filter.opaque;
521 av_buffer_unref(&pes->buffer);
522 /* referenced private data will be freed later in
523 * avformat_close_input */
524 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
525 av_freep(&filter->u.pes_filter.opaque);
530 ts->pids[pid] = NULL;
533 static int analyze(const uint8_t *buf, int size, int packet_size, int *index,
536 int stat[TS_MAX_PACKET_SIZE];
541 memset(stat, 0, packet_size * sizeof(*stat));
543 for (i = 0; i < size - 3; i++) {
544 if (buf[i] == 0x47 &&
545 (!probe || (!(buf[i + 1] & 0x80) && buf[i + 3] != 0x47))) {
546 int x = i % packet_size;
549 if (stat[x] > best_score) {
550 best_score = stat[x];
557 return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
560 /* autodetect fec presence. Must have at least 1024 bytes */
561 static int get_packet_size(const uint8_t *buf, int size)
563 int score, fec_score, dvhs_score;
565 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
566 return AVERROR_INVALIDDATA;
568 score = analyze(buf, size, TS_PACKET_SIZE, NULL, 0);
569 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL, 0);
570 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL, 0);
571 av_log(NULL, AV_LOG_TRACE, "score: %d, dvhs_score: %d, fec_score: %d \n",
572 score, dvhs_score, fec_score);
574 if (score > fec_score && score > dvhs_score)
575 return TS_PACKET_SIZE;
576 else if (dvhs_score > score && dvhs_score > fec_score)
577 return TS_DVHS_PACKET_SIZE;
578 else if (score < fec_score && dvhs_score < fec_score)
579 return TS_FEC_PACKET_SIZE;
581 return AVERROR_INVALIDDATA;
584 typedef struct SectionHeader {
589 uint8_t last_sec_num;
592 static int skip_identical(const SectionHeader *h, MpegTSSectionFilter *tssf)
594 if (h->version == tssf->last_ver && tssf->last_crc == tssf->crc)
597 tssf->last_ver = h->version;
598 tssf->last_crc = tssf->crc;
603 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
610 return AVERROR_INVALIDDATA;
616 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
623 return AVERROR_INVALIDDATA;
630 /* read and allocate a DVB string preceded by its length */
631 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
638 len = get8(&p, p_end);
643 str = av_malloc(len + 1);
653 static int parse_section_header(SectionHeader *h,
654 const uint8_t **pp, const uint8_t *p_end)
658 val = get8(pp, p_end);
663 val = get16(pp, p_end);
667 val = get8(pp, p_end);
670 h->version = (val >> 1) & 0x1f;
671 val = get8(pp, p_end);
675 val = get8(pp, p_end);
678 h->last_sec_num = val;
682 typedef struct StreamType {
683 uint32_t stream_type;
684 enum AVMediaType codec_type;
685 enum AVCodecID codec_id;
688 static const StreamType ISO_types[] = {
689 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
690 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
691 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
692 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
693 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
694 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
695 /* Makito encoder sets stream type 0x11 for AAC,
696 * so auto-detect LOAS/LATM instead of hardcoding it. */
697 #if !CONFIG_LOAS_DEMUXER
698 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
700 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
701 { 0x20, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
702 { 0x21, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_JPEG2000 },
703 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
704 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
705 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
706 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
710 static const StreamType HDMV_types[] = {
711 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
712 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
713 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
714 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
715 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
716 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
717 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
718 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
719 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
720 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
721 { 0x92, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_TEXT_SUBTITLE },
726 static const StreamType MISC_types[] = {
727 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
728 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
732 static const StreamType REGD_types[] = {
733 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
734 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
735 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
736 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
737 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
738 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
739 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
740 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
741 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
742 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
746 static const StreamType METADATA_types[] = {
747 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
748 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
752 /* descriptor present */
753 static const StreamType DESC_types[] = {
754 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
755 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
756 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
757 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
758 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
762 static void mpegts_find_stream_type(AVStream *st,
763 uint32_t stream_type,
764 const StreamType *types)
766 if (avcodec_is_open(st->codec)) {
767 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
771 for (; types->stream_type; types++)
772 if (stream_type == types->stream_type) {
773 st->codec->codec_type = types->codec_type;
774 st->codec->codec_id = types->codec_id;
775 st->request_probe = 0;
780 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
781 uint32_t stream_type, uint32_t prog_reg_desc)
783 int old_codec_type = st->codec->codec_type;
784 int old_codec_id = st->codec->codec_id;
786 if (avcodec_is_open(st->codec)) {
787 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
791 avpriv_set_pts_info(st, 33, 1, 90000);
793 st->codec->codec_type = AVMEDIA_TYPE_DATA;
794 st->codec->codec_id = AV_CODEC_ID_NONE;
795 st->need_parsing = AVSTREAM_PARSE_FULL;
797 pes->stream_type = stream_type;
799 av_log(pes->stream, AV_LOG_DEBUG,
800 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
801 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
803 st->codec->codec_tag = pes->stream_type;
805 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
806 if ((prog_reg_desc == AV_RL32("HDMV") ||
807 prog_reg_desc == AV_RL32("HDPR")) &&
808 st->codec->codec_id == AV_CODEC_ID_NONE) {
809 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
810 if (pes->stream_type == 0x83) {
811 // HDMV TrueHD streams also contain an AC3 coded version of the
812 // audio track - add a second stream for this
814 // priv_data cannot be shared between streams
815 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
817 return AVERROR(ENOMEM);
818 memcpy(sub_pes, pes, sizeof(*sub_pes));
820 sub_st = avformat_new_stream(pes->stream, NULL);
823 return AVERROR(ENOMEM);
826 sub_st->id = pes->pid;
827 avpriv_set_pts_info(sub_st, 33, 1, 90000);
828 sub_st->priv_data = sub_pes;
829 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
830 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
831 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
832 sub_pes->sub_st = pes->sub_st = sub_st;
835 if (st->codec->codec_id == AV_CODEC_ID_NONE)
836 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
837 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
838 st->codec->codec_id = old_codec_id;
839 st->codec->codec_type = old_codec_type;
841 if ((st->codec->codec_id == AV_CODEC_ID_NONE ||
842 (st->request_probe > 0 && st->request_probe < AVPROBE_SCORE_STREAM_RETRY / 5)) &&
843 !avcodec_is_open(st->codec) &&
844 st->probe_packets > 0 &&
845 stream_type == STREAM_TYPE_PRIVATE_DATA) {
846 st->codec->codec_type = AVMEDIA_TYPE_DATA;
847 st->codec->codec_id = AV_CODEC_ID_BIN_DATA;
848 st->request_probe = AVPROBE_SCORE_STREAM_RETRY / 5;
854 static void reset_pes_packet_state(PESContext *pes)
856 pes->pts = AV_NOPTS_VALUE;
857 pes->dts = AV_NOPTS_VALUE;
860 av_buffer_unref(&pes->buffer);
863 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
867 pkt->buf = pes->buffer;
868 pkt->data = pes->buffer->data;
869 pkt->size = pes->data_index;
871 if (pes->total_size != MAX_PES_PAYLOAD &&
872 pes->pes_header_size + pes->data_index != pes->total_size +
874 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
875 pes->flags |= AV_PKT_FLAG_CORRUPT;
877 memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
879 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
880 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
881 pkt->stream_index = pes->sub_st->index;
883 pkt->stream_index = pes->st->index;
886 /* store position of first TS packet of this PES packet */
887 pkt->pos = pes->ts_packet_pos;
888 pkt->flags = pes->flags;
891 reset_pes_packet_state(pes);
894 static uint64_t get_ts64(GetBitContext *gb, int bits)
896 if (get_bits_left(gb) < bits)
897 return AV_NOPTS_VALUE;
898 return get_bits64(gb, bits);
901 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
902 const uint8_t *buf, int buf_size)
905 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
906 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
907 int dts_flag = -1, cts_flag = -1;
908 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
909 uint8_t buf_padded[128 + AV_INPUT_BUFFER_PADDING_SIZE];
910 int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - AV_INPUT_BUFFER_PADDING_SIZE);
912 memcpy(buf_padded, buf, buf_padded_size);
914 init_get_bits(&gb, buf_padded, buf_padded_size * 8);
916 if (sl->use_au_start)
917 au_start_flag = get_bits1(&gb);
919 au_end_flag = get_bits1(&gb);
920 if (!sl->use_au_start && !sl->use_au_end)
921 au_start_flag = au_end_flag = 1;
923 ocr_flag = get_bits1(&gb);
925 idle_flag = get_bits1(&gb);
927 padding_flag = get_bits1(&gb);
929 padding_bits = get_bits(&gb, 3);
931 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
932 if (sl->packet_seq_num_len)
933 skip_bits_long(&gb, sl->packet_seq_num_len);
934 if (sl->degr_prior_len)
936 skip_bits(&gb, sl->degr_prior_len);
938 skip_bits_long(&gb, sl->ocr_len);
940 if (sl->use_rand_acc_pt)
942 if (sl->au_seq_num_len > 0)
943 skip_bits_long(&gb, sl->au_seq_num_len);
944 if (sl->use_timestamps) {
945 dts_flag = get_bits1(&gb);
946 cts_flag = get_bits1(&gb);
949 if (sl->inst_bitrate_len)
950 inst_bitrate_flag = get_bits1(&gb);
952 dts = get_ts64(&gb, sl->timestamp_len);
954 cts = get_ts64(&gb, sl->timestamp_len);
956 skip_bits_long(&gb, sl->au_len);
957 if (inst_bitrate_flag)
958 skip_bits_long(&gb, sl->inst_bitrate_len);
961 if (dts != AV_NOPTS_VALUE)
963 if (cts != AV_NOPTS_VALUE)
966 if (sl->timestamp_len && sl->timestamp_res)
967 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
969 return (get_bits_count(&gb) + 7) >> 3;
972 /* return non zero if a packet could be constructed */
973 static int mpegts_push_data(MpegTSFilter *filter,
974 const uint8_t *buf, int buf_size, int is_start,
977 PESContext *pes = filter->u.pes_filter.opaque;
978 MpegTSContext *ts = pes->ts;
986 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
987 new_pes_packet(pes, ts->pkt);
990 reset_pes_packet_state(pes);
992 pes->state = MPEGTS_HEADER;
993 pes->ts_packet_pos = pos;
996 while (buf_size > 0) {
997 switch (pes->state) {
999 len = PES_START_SIZE - pes->data_index;
1002 memcpy(pes->header + pes->data_index, p, len);
1003 pes->data_index += len;
1006 if (pes->data_index == PES_START_SIZE) {
1007 /* we got all the PES or section header. We can now
1009 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
1010 pes->header[2] == 0x01) {
1011 /* it must be an mpeg2 PES stream */
1012 code = pes->header[3] | 0x100;
1013 av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
1016 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
1018 pes->sub_st->discard == AVDISCARD_ALL)) ||
1019 code == 0x1be) /* padding_stream */
1022 /* stream not present in PMT */
1024 if (ts->skip_changes)
1027 pes->st = avformat_new_stream(ts->stream, NULL);
1029 return AVERROR(ENOMEM);
1030 pes->st->id = pes->pid;
1031 mpegts_set_stream_info(pes->st, pes, 0, 0);
1034 pes->total_size = AV_RB16(pes->header + 4);
1035 /* NOTE: a zero total size means the PES size is
1037 if (!pes->total_size)
1038 pes->total_size = MAX_PES_PAYLOAD;
1040 /* allocate pes buffer */
1041 pes->buffer = av_buffer_alloc(pes->total_size +
1042 AV_INPUT_BUFFER_PADDING_SIZE);
1044 return AVERROR(ENOMEM);
1046 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1047 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1048 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1049 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1050 pes->state = MPEGTS_PESHEADER;
1051 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1052 av_log(pes->stream, AV_LOG_TRACE,
1053 "pid=%x stream_type=%x probing\n",
1056 pes->st->request_probe = 1;
1059 pes->pes_header_size = 6;
1060 pes->state = MPEGTS_PAYLOAD;
1061 pes->data_index = 0;
1064 /* otherwise, it should be a table */
1067 pes->state = MPEGTS_SKIP;
1072 /**********************************************/
1073 /* PES packing parsing */
1074 case MPEGTS_PESHEADER:
1075 len = PES_HEADER_SIZE - pes->data_index;
1077 return AVERROR_INVALIDDATA;
1080 memcpy(pes->header + pes->data_index, p, len);
1081 pes->data_index += len;
1084 if (pes->data_index == PES_HEADER_SIZE) {
1085 pes->pes_header_size = pes->header[8] + 9;
1086 pes->state = MPEGTS_PESHEADER_FILL;
1089 case MPEGTS_PESHEADER_FILL:
1090 len = pes->pes_header_size - pes->data_index;
1092 return AVERROR_INVALIDDATA;
1095 memcpy(pes->header + pes->data_index, p, len);
1096 pes->data_index += len;
1099 if (pes->data_index == pes->pes_header_size) {
1101 unsigned int flags, pes_ext, skip;
1103 flags = pes->header[7];
1104 r = pes->header + 9;
1105 pes->pts = AV_NOPTS_VALUE;
1106 pes->dts = AV_NOPTS_VALUE;
1107 if ((flags & 0xc0) == 0x80) {
1108 pes->dts = pes->pts = ff_parse_pes_pts(r);
1110 } else if ((flags & 0xc0) == 0xc0) {
1111 pes->pts = ff_parse_pes_pts(r);
1113 pes->dts = ff_parse_pes_pts(r);
1116 pes->extended_stream_id = -1;
1117 if (flags & 0x01) { /* PES extension */
1119 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1120 skip = (pes_ext >> 4) & 0xb;
1123 if ((pes_ext & 0x41) == 0x01 &&
1124 (r + 2) <= (pes->header + pes->pes_header_size)) {
1125 /* PES extension 2 */
1126 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1127 pes->extended_stream_id = r[1];
1131 /* we got the full header. We parse it and get the payload */
1132 pes->state = MPEGTS_PAYLOAD;
1133 pes->data_index = 0;
1134 if (pes->stream_type == 0x12 && buf_size > 0) {
1135 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1137 pes->pes_header_size += sl_header_bytes;
1138 p += sl_header_bytes;
1139 buf_size -= sl_header_bytes;
1141 if (pes->stream_type == 0x15 && buf_size >= 5) {
1142 /* skip metadata access unit header */
1143 pes->pes_header_size += 5;
1147 if ( pes->ts->fix_teletext_pts
1148 && ( pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT
1149 || pes->st->codec->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
1151 AVProgram *p = NULL;
1152 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1153 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1154 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1156 AVStream *st = NULL;
1157 if (f->type == MPEGTS_PES) {
1158 PESContext *pcrpes = f->u.pes_filter.opaque;
1161 } else if (f->type == MPEGTS_PCR) {
1163 for (i = 0; i < p->nb_stream_indexes; i++) {
1164 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1165 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1169 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1170 // teletext packets do not always have correct timestamps,
1171 // the standard says they should be handled after 40.6 ms at most,
1172 // and the pcr error to this packet should be no more than 100 ms.
1173 // TODO: we should interpolate the PCR, not just use the last one
1174 int64_t pcr = f->last_pcr / 300;
1175 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1176 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1177 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1178 pes->pts = pes->dts = pcr;
1179 } else if (pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT &&
1180 pes->dts > pcr + 3654 + 9000) {
1181 pes->pts = pes->dts = pcr + 3654 + 9000;
1182 } else if (pes->st->codec->codec_id == AV_CODEC_ID_DVB_SUBTITLE &&
1183 pes->dts > pcr + 10*90000) { //10sec
1184 pes->pts = pes->dts = pcr + 3654 + 9000;
1194 case MPEGTS_PAYLOAD:
1196 if (pes->data_index > 0 &&
1197 pes->data_index + buf_size > pes->total_size) {
1198 new_pes_packet(pes, ts->pkt);
1199 pes->total_size = MAX_PES_PAYLOAD;
1200 pes->buffer = av_buffer_alloc(pes->total_size +
1201 AV_INPUT_BUFFER_PADDING_SIZE);
1203 return AVERROR(ENOMEM);
1205 } else if (pes->data_index == 0 &&
1206 buf_size > pes->total_size) {
1207 // pes packet size is < ts size packet and pes data is padded with 0xff
1208 // not sure if this is legal in ts but see issue #2392
1209 buf_size = pes->total_size;
1211 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1212 pes->data_index += buf_size;
1213 /* emit complete packets with known packet size
1214 * decreases demuxer delay for infrequent packets like subtitles from
1215 * a couple of seconds to milliseconds for properly muxed files.
1216 * total_size is the number of bytes following pes_packet_length
1217 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1218 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1219 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1221 new_pes_packet(pes, ts->pkt);
1235 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1240 /* if no pid found, then add a pid context */
1241 pes = av_mallocz(sizeof(PESContext));
1245 pes->stream = ts->stream;
1247 pes->pcr_pid = pcr_pid;
1248 pes->state = MPEGTS_SKIP;
1249 pes->pts = AV_NOPTS_VALUE;
1250 pes->dts = AV_NOPTS_VALUE;
1251 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1260 typedef struct MP4DescrParseContext {
1264 Mp4Descr *active_descr;
1266 int max_descr_count;
1268 int predefined_SLConfigDescriptor_seen;
1269 } MP4DescrParseContext;
1271 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1272 const uint8_t *buf, unsigned size,
1273 Mp4Descr *descr, int max_descr_count)
1276 if (size > (1 << 30))
1277 return AVERROR_INVALIDDATA;
1279 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1280 NULL, NULL, NULL, NULL)) < 0)
1287 d->active_descr = NULL;
1288 d->max_descr_count = max_descr_count;
1293 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1295 int64_t new_off = avio_tell(pb);
1296 (*len) -= new_off - *off;
1300 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1303 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1306 int ret = parse_mp4_descr(d, off, len, 0);
1309 update_offsets(&d->pb, &off, &len);
1314 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1316 avio_rb16(&d->pb); // ID
1322 update_offsets(&d->pb, &off, &len);
1323 return parse_mp4_descr_arr(d, off, len);
1326 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1331 id_flags = avio_rb16(&d->pb);
1332 if (!(id_flags & 0x0020)) { // URL_Flag
1333 update_offsets(&d->pb, &off, &len);
1334 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1340 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1343 if (d->descr_count >= d->max_descr_count)
1344 return AVERROR_INVALIDDATA;
1345 ff_mp4_parse_es_descr(&d->pb, &es_id);
1346 d->active_descr = d->descr + (d->descr_count++);
1348 d->active_descr->es_id = es_id;
1349 update_offsets(&d->pb, &off, &len);
1350 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1351 update_offsets(&d->pb, &off, &len);
1353 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1354 d->active_descr = NULL;
1358 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1361 Mp4Descr *descr = d->active_descr;
1363 return AVERROR_INVALIDDATA;
1364 d->active_descr->dec_config_descr = av_malloc(len);
1365 if (!descr->dec_config_descr)
1366 return AVERROR(ENOMEM);
1367 descr->dec_config_descr_len = len;
1368 avio_read(&d->pb, descr->dec_config_descr, len);
1372 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1374 Mp4Descr *descr = d->active_descr;
1377 return AVERROR_INVALIDDATA;
1379 predefined = avio_r8(&d->pb);
1382 int flags = avio_r8(&d->pb);
1383 descr->sl.use_au_start = !!(flags & 0x80);
1384 descr->sl.use_au_end = !!(flags & 0x40);
1385 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1386 descr->sl.use_padding = !!(flags & 0x08);
1387 descr->sl.use_timestamps = !!(flags & 0x04);
1388 descr->sl.use_idle = !!(flags & 0x02);
1389 descr->sl.timestamp_res = avio_rb32(&d->pb);
1391 descr->sl.timestamp_len = avio_r8(&d->pb);
1392 if (descr->sl.timestamp_len > 64) {
1393 avpriv_request_sample(NULL, "timestamp_len > 64");
1394 descr->sl.timestamp_len = 64;
1395 return AVERROR_PATCHWELCOME;
1397 descr->sl.ocr_len = avio_r8(&d->pb);
1398 descr->sl.au_len = avio_r8(&d->pb);
1399 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1400 lengths = avio_rb16(&d->pb);
1401 descr->sl.degr_prior_len = lengths >> 12;
1402 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1403 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1404 } else if (!d->predefined_SLConfigDescriptor_seen){
1405 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1406 d->predefined_SLConfigDescriptor_seen = 1;
1411 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1415 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1416 update_offsets(&d->pb, &off, &len);
1417 if (len < 0 || len1 > len || len1 <= 0) {
1418 av_log(d->s, AV_LOG_ERROR,
1419 "Tag %x length violation new length %d bytes remaining %d\n",
1421 return AVERROR_INVALIDDATA;
1424 if (d->level++ >= MAX_LEVEL) {
1425 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1429 if (target_tag && tag != target_tag) {
1430 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1437 parse_MP4IODescrTag(d, off, len1);
1440 parse_MP4ODescrTag(d, off, len1);
1443 parse_MP4ESDescrTag(d, off, len1);
1445 case MP4DecConfigDescrTag:
1446 parse_MP4DecConfigDescrTag(d, off, len1);
1449 parse_MP4SLDescrTag(d, off, len1);
1456 avio_seek(&d->pb, off + len1, SEEK_SET);
1460 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1461 Mp4Descr *descr, int *descr_count, int max_descr_count)
1463 MP4DescrParseContext d;
1466 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1470 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1472 *descr_count = d.descr_count;
1476 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1477 Mp4Descr *descr, int *descr_count, int max_descr_count)
1479 MP4DescrParseContext d;
1482 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1486 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1488 *descr_count = d.descr_count;
1492 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1495 MpegTSContext *ts = filter->u.section_filter.opaque;
1496 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1498 const uint8_t *p, *p_end;
1500 int mp4_descr_count = 0;
1501 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1503 AVFormatContext *s = ts->stream;
1505 p_end = section + section_len - 4;
1507 if (parse_section_header(&h, &p, p_end) < 0)
1509 if (h.tid != M4OD_TID)
1511 if (skip_identical(&h, tssf))
1514 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1515 MAX_MP4_DESCR_COUNT);
1517 for (pid = 0; pid < NB_PID_MAX; pid++) {
1520 for (i = 0; i < mp4_descr_count; i++) {
1523 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1525 if (ts->pids[pid]->type != MPEGTS_PES) {
1526 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1529 pes = ts->pids[pid]->u.pes_filter.opaque;
1534 pes->sl = mp4_descr[i].sl;
1536 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1537 mp4_descr[i].dec_config_descr_len, 0,
1538 NULL, NULL, NULL, NULL);
1539 ff_mp4_read_dec_config_descr(s, st, &pb);
1540 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1541 st->codec->extradata_size > 0)
1542 st->need_parsing = 0;
1543 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1544 st->codec->extradata_size > 0)
1545 st->need_parsing = 0;
1547 st->codec->codec_type = avcodec_get_type(st->codec->codec_id);
1550 for (i = 0; i < mp4_descr_count; i++)
1551 av_free(mp4_descr[i].dec_config_descr);
1554 static const uint8_t opus_coupled_stream_cnt[9] = {
1555 1, 0, 1, 1, 2, 2, 2, 3, 3
1558 static const uint8_t opus_stream_cnt[9] = {
1559 1, 1, 1, 2, 2, 3, 4, 4, 5,
1562 static const uint8_t opus_channel_map[8][8] = {
1570 { 0,6,1,2,3,4,5,7 },
1573 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1574 const uint8_t **pp, const uint8_t *desc_list_end,
1575 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1578 const uint8_t *desc_end;
1579 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1583 desc_tag = get8(pp, desc_list_end);
1585 return AVERROR_INVALIDDATA;
1586 desc_len = get8(pp, desc_list_end);
1588 return AVERROR_INVALIDDATA;
1589 desc_end = *pp + desc_len;
1590 if (desc_end > desc_list_end)
1591 return AVERROR_INVALIDDATA;
1593 av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1595 if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1596 stream_type == STREAM_TYPE_PRIVATE_DATA)
1597 mpegts_find_stream_type(st, desc_tag, DESC_types);
1600 case 0x1E: /* SL descriptor */
1601 desc_es_id = get16(pp, desc_end);
1604 if (ts && ts->pids[pid])
1605 ts->pids[pid]->es_id = desc_es_id;
1606 for (i = 0; i < mp4_descr_count; i++)
1607 if (mp4_descr[i].dec_config_descr_len &&
1608 mp4_descr[i].es_id == desc_es_id) {
1610 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1611 mp4_descr[i].dec_config_descr_len, 0,
1612 NULL, NULL, NULL, NULL);
1613 ff_mp4_read_dec_config_descr(fc, st, &pb);
1614 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1615 st->codec->extradata_size > 0)
1616 st->need_parsing = 0;
1617 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1618 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1621 case 0x1F: /* FMC descriptor */
1622 if (get16(pp, desc_end) < 0)
1624 if (mp4_descr_count > 0 &&
1625 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM ||
1626 (st->request_probe == 0 && st->codec->codec_id == AV_CODEC_ID_NONE) ||
1627 st->request_probe > 0) &&
1628 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1630 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1631 mp4_descr->dec_config_descr_len, 0,
1632 NULL, NULL, NULL, NULL);
1633 ff_mp4_read_dec_config_descr(fc, st, &pb);
1634 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1635 st->codec->extradata_size > 0) {
1636 st->request_probe = st->need_parsing = 0;
1637 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1641 case 0x56: /* DVB teletext descriptor */
1643 uint8_t *extradata = NULL;
1644 int language_count = desc_len / 5;
1646 if (desc_len > 0 && desc_len % 5 != 0)
1647 return AVERROR_INVALIDDATA;
1649 if (language_count > 0) {
1650 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1651 av_assert0(language_count <= sizeof(language) / 4);
1653 if (st->codec->extradata == NULL) {
1654 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1655 return AVERROR(ENOMEM);
1659 if (st->codec->extradata_size < language_count * 2)
1660 return AVERROR_INVALIDDATA;
1662 extradata = st->codec->extradata;
1664 for (i = 0; i < language_count; i++) {
1665 language[i * 4 + 0] = get8(pp, desc_end);
1666 language[i * 4 + 1] = get8(pp, desc_end);
1667 language[i * 4 + 2] = get8(pp, desc_end);
1668 language[i * 4 + 3] = ',';
1670 memcpy(extradata, *pp, 2);
1676 language[i * 4 - 1] = 0;
1677 av_dict_set(&st->metadata, "language", language, 0);
1681 case 0x59: /* subtitling descriptor */
1683 /* 8 bytes per DVB subtitle substream data:
1684 * ISO_639_language_code (3 bytes),
1685 * subtitling_type (1 byte),
1686 * composition_page_id (2 bytes),
1687 * ancillary_page_id (2 bytes) */
1688 int language_count = desc_len / 8;
1690 if (desc_len > 0 && desc_len % 8 != 0)
1691 return AVERROR_INVALIDDATA;
1693 if (language_count > 1) {
1694 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1697 if (language_count > 0) {
1700 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1701 av_assert0(language_count <= sizeof(language) / 4);
1703 if (st->codec->extradata == NULL) {
1704 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1705 return AVERROR(ENOMEM);
1709 if (st->codec->extradata_size < language_count * 5)
1710 return AVERROR_INVALIDDATA;
1712 extradata = st->codec->extradata;
1714 for (i = 0; i < language_count; i++) {
1715 language[i * 4 + 0] = get8(pp, desc_end);
1716 language[i * 4 + 1] = get8(pp, desc_end);
1717 language[i * 4 + 2] = get8(pp, desc_end);
1718 language[i * 4 + 3] = ',';
1720 /* hearing impaired subtitles detection using subtitling_type */
1722 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1723 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1724 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1725 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1726 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1727 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1728 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1732 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1733 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1739 language[i * 4 - 1] = 0;
1740 av_dict_set(&st->metadata, "language", language, 0);
1744 case 0x0a: /* ISO 639 language descriptor */
1745 for (i = 0; i + 4 <= desc_len; i += 4) {
1746 language[i + 0] = get8(pp, desc_end);
1747 language[i + 1] = get8(pp, desc_end);
1748 language[i + 2] = get8(pp, desc_end);
1749 language[i + 3] = ',';
1750 switch (get8(pp, desc_end)) {
1752 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1755 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1758 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1762 if (i && language[0]) {
1763 language[i - 1] = 0;
1764 av_dict_set(&st->metadata, "language", language, 0);
1767 case 0x05: /* registration descriptor */
1768 st->codec->codec_tag = bytestream_get_le32(pp);
1769 av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1770 if (st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0)
1771 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1773 case 0x52: /* stream identifier descriptor */
1774 st->stream_identifier = 1 + get8(pp, desc_end);
1776 case 0x26: /* metadata descriptor */
1777 if (get16(pp, desc_end) == 0xFFFF)
1779 if (get8(pp, desc_end) == 0xFF) {
1780 st->codec->codec_tag = bytestream_get_le32(pp);
1781 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1782 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1785 case 0x7f: /* DVB extension descriptor */
1786 ext_desc_tag = get8(pp, desc_end);
1787 if (ext_desc_tag < 0)
1788 return AVERROR_INVALIDDATA;
1789 if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1790 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1791 if (!st->codec->extradata) {
1792 st->codec->extradata = av_mallocz(sizeof(opus_default_extradata) +
1793 AV_INPUT_BUFFER_PADDING_SIZE);
1794 if (!st->codec->extradata)
1795 return AVERROR(ENOMEM);
1797 st->codec->extradata_size = sizeof(opus_default_extradata);
1798 memcpy(st->codec->extradata, opus_default_extradata, sizeof(opus_default_extradata));
1800 channel_config_code = get8(pp, desc_end);
1801 if (channel_config_code < 0)
1802 return AVERROR_INVALIDDATA;
1803 if (channel_config_code <= 0x8) {
1804 st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1805 st->codec->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
1806 st->codec->extradata[19] = opus_stream_cnt[channel_config_code];
1807 st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1808 memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1810 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1812 st->need_parsing = AVSTREAM_PARSE_FULL;
1823 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1825 MpegTSContext *ts = filter->u.section_filter.opaque;
1826 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1827 SectionHeader h1, *h = &h1;
1830 const uint8_t *p, *p_end, *desc_list_end;
1831 int program_info_length, pcr_pid, pid, stream_type;
1833 uint32_t prog_reg_desc = 0; /* registration descriptor */
1835 int mp4_descr_count = 0;
1836 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1839 av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
1840 hex_dump_debug(ts->stream, section, section_len);
1842 p_end = section + section_len - 4;
1844 if (parse_section_header(h, &p, p_end) < 0)
1846 if (skip_identical(h, tssf))
1849 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d version=%d\n",
1850 h->id, h->sec_num, h->last_sec_num, h->version);
1852 if (h->tid != PMT_TID)
1854 if (!ts->scan_all_pmts && ts->skip_changes)
1857 if (!ts->skip_clear)
1858 clear_program(ts, h->id);
1860 pcr_pid = get16(&p, p_end);
1864 add_pid_to_pmt(ts, h->id, pcr_pid);
1865 set_pcr_pid(ts->stream, h->id, pcr_pid);
1867 av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
1869 program_info_length = get16(&p, p_end);
1870 if (program_info_length < 0)
1872 program_info_length &= 0xfff;
1873 while (program_info_length >= 2) {
1875 tag = get8(&p, p_end);
1876 len = get8(&p, p_end);
1878 av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
1880 if (len > program_info_length - 2)
1881 // something else is broken, exit the program_descriptors_loop
1883 program_info_length -= len + 2;
1884 if (tag == 0x1d) { // IOD descriptor
1885 get8(&p, p_end); // scope
1886 get8(&p, p_end); // label
1888 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1889 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1890 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1891 prog_reg_desc = bytestream_get_le32(&p);
1896 p += program_info_length;
1900 // stop parsing after pmt, we found header
1901 if (!ts->stream->nb_streams)
1904 set_pmt_found(ts, h->id);
1910 stream_type = get8(&p, p_end);
1911 if (stream_type < 0)
1913 pid = get16(&p, p_end);
1917 if (pid == ts->current_pid)
1920 /* now create stream */
1921 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1922 pes = ts->pids[pid]->u.pes_filter.opaque;
1924 pes->st = avformat_new_stream(pes->stream, NULL);
1927 pes->st->id = pes->pid;
1930 } else if (stream_type != 0x13) {
1932 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1933 pes = add_pes_stream(ts, pid, pcr_pid);
1935 st = avformat_new_stream(pes->stream, NULL);
1941 int idx = ff_find_stream_index(ts->stream, pid);
1943 st = ts->stream->streams[idx];
1945 st = avformat_new_stream(ts->stream, NULL);
1949 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1956 if (pes && !pes->stream_type)
1957 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1959 add_pid_to_pmt(ts, h->id, pid);
1961 ff_program_add_stream_index(ts->stream, h->id, st->index);
1963 desc_list_len = get16(&p, p_end);
1964 if (desc_list_len < 0)
1966 desc_list_len &= 0xfff;
1967 desc_list_end = p + desc_list_len;
1968 if (desc_list_end > p_end)
1971 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1972 desc_list_end, mp4_descr,
1973 mp4_descr_count, pid, ts) < 0)
1976 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1977 stream_type == 0x83 && pes->sub_st) {
1978 ff_program_add_stream_index(ts->stream, h->id,
1979 pes->sub_st->index);
1980 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1986 if (!ts->pids[pcr_pid])
1987 mpegts_open_pcr_filter(ts, pcr_pid);
1990 for (i = 0; i < mp4_descr_count; i++)
1991 av_free(mp4_descr[i].dec_config_descr);
1994 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1996 MpegTSContext *ts = filter->u.section_filter.opaque;
1997 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1998 SectionHeader h1, *h = &h1;
1999 const uint8_t *p, *p_end;
2003 av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
2004 hex_dump_debug(ts->stream, section, section_len);
2006 p_end = section + section_len - 4;
2008 if (parse_section_header(h, &p, p_end) < 0)
2010 if (h->tid != PAT_TID)
2012 if (ts->skip_changes)
2015 if (skip_identical(h, tssf))
2017 ts->stream->ts_id = h->id;
2021 sid = get16(&p, p_end);
2024 pmt_pid = get16(&p, p_end);
2029 if (pmt_pid == ts->current_pid)
2032 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
2034 if (sid == 0x0000) {
2037 MpegTSFilter *fil = ts->pids[pmt_pid];
2038 program = av_new_program(ts->stream, sid);
2040 program->program_num = sid;
2041 program->pmt_pid = pmt_pid;
2044 if ( fil->type != MPEGTS_SECTION
2045 || fil->pid != pmt_pid
2046 || fil->u.section_filter.section_cb != pmt_cb)
2047 mpegts_close_filter(ts, ts->pids[pmt_pid]);
2049 if (!ts->pids[pmt_pid])
2050 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2051 add_pat_entry(ts, sid);
2052 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2053 add_pid_to_pmt(ts, sid, pmt_pid);
2059 for (j=0; j<ts->stream->nb_programs; j++) {
2060 for (i = 0; i < ts->nb_prg; i++)
2061 if (ts->prg[i].id == ts->stream->programs[j]->id)
2063 if (i==ts->nb_prg && !ts->skip_clear)
2064 clear_avprogram(ts, ts->stream->programs[j]->id);
2069 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2071 MpegTSContext *ts = filter->u.section_filter.opaque;
2072 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2073 SectionHeader h1, *h = &h1;
2074 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2075 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2076 char *name, *provider_name;
2078 av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
2079 hex_dump_debug(ts->stream, section, section_len);
2081 p_end = section + section_len - 4;
2083 if (parse_section_header(h, &p, p_end) < 0)
2085 if (h->tid != SDT_TID)
2087 if (ts->skip_changes)
2089 if (skip_identical(h, tssf))
2092 onid = get16(&p, p_end);
2095 val = get8(&p, p_end);
2099 sid = get16(&p, p_end);
2102 val = get8(&p, p_end);
2105 desc_list_len = get16(&p, p_end);
2106 if (desc_list_len < 0)
2108 desc_list_len &= 0xfff;
2109 desc_list_end = p + desc_list_len;
2110 if (desc_list_end > p_end)
2113 desc_tag = get8(&p, desc_list_end);
2116 desc_len = get8(&p, desc_list_end);
2117 desc_end = p + desc_len;
2118 if (desc_len < 0 || desc_end > desc_list_end)
2121 av_log(ts->stream, AV_LOG_TRACE, "tag: 0x%02x len=%d\n",
2122 desc_tag, desc_len);
2126 service_type = get8(&p, p_end);
2127 if (service_type < 0)
2129 provider_name = getstr8(&p, p_end);
2132 name = getstr8(&p, p_end);
2134 AVProgram *program = av_new_program(ts->stream, sid);
2136 av_dict_set(&program->metadata, "service_name", name, 0);
2137 av_dict_set(&program->metadata, "service_provider",
2142 av_free(provider_name);
2153 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2154 const uint8_t *packet);
2156 /* handle one TS packet */
2157 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2160 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2161 has_adaptation, has_payload;
2162 const uint8_t *p, *p_end;
2165 pid = AV_RB16(packet + 1) & 0x1fff;
2166 if (pid && discard_pid(ts, pid))
2168 is_start = packet[1] & 0x40;
2169 tss = ts->pids[pid];
2170 if (ts->auto_guess && !tss && is_start) {
2171 add_pes_stream(ts, pid, -1);
2172 tss = ts->pids[pid];
2176 ts->current_pid = pid;
2178 afc = (packet[3] >> 4) & 3;
2179 if (afc == 0) /* reserved value */
2181 has_adaptation = afc & 2;
2182 has_payload = afc & 1;
2183 is_discontinuity = has_adaptation &&
2184 packet[4] != 0 && /* with length > 0 */
2185 (packet[5] & 0x80); /* and discontinuity indicated */
2187 /* continuity check (currently not used) */
2188 cc = (packet[3] & 0xf);
2189 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2190 cc_ok = pid == 0x1FFF || // null packet PID
2197 av_log(ts->stream, AV_LOG_DEBUG,
2198 "Continuity check failed for pid %d expected %d got %d\n",
2199 pid, expected_cc, cc);
2200 if (tss->type == MPEGTS_PES) {
2201 PESContext *pc = tss->u.pes_filter.opaque;
2202 pc->flags |= AV_PKT_FLAG_CORRUPT;
2207 if (has_adaptation) {
2210 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2211 tss->last_pcr = pcr_h * 300 + pcr_l;
2212 /* skip adaptation field */
2215 /* if past the end of packet, ignore */
2216 p_end = packet + TS_PACKET_SIZE;
2217 if (p >= p_end || !has_payload)
2220 pos = avio_tell(ts->stream->pb);
2222 av_assert0(pos >= TS_PACKET_SIZE);
2223 ts->pos47_full = pos - TS_PACKET_SIZE;
2226 if (tss->type == MPEGTS_SECTION) {
2228 /* pointer field present */
2230 if (len > p_end - p)
2233 /* write remaining section bytes */
2234 write_section_data(ts, tss,
2236 /* check whether filter has been closed */
2242 write_section_data(ts, tss,
2247 write_section_data(ts, tss,
2252 // stop find_stream_info from waiting for more streams
2253 // when all programs have received a PMT
2254 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2256 for (i = 0; i < ts->nb_prg; i++) {
2257 if (!ts->prg[i].pmt_found)
2260 if (i == ts->nb_prg && ts->nb_prg > 0) {
2262 for (i = 0; i < ts->stream->nb_streams; i++) {
2263 AVStream *st = ts->stream->streams[i];
2264 types |= 1<<st->codec->codec_type;
2266 if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2267 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2268 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2275 // Note: The position here points actually behind the current packet.
2276 if (tss->type == MPEGTS_PES) {
2277 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2278 pos - ts->raw_packet_size)) < 0)
2286 static void reanalyze(MpegTSContext *ts) {
2287 AVIOContext *pb = ts->stream->pb;
2288 int64_t pos = avio_tell(pb);
2291 pos -= ts->pos47_full;
2292 if (pos == TS_PACKET_SIZE) {
2293 ts->size_stat[0] ++;
2294 } else if (pos == TS_DVHS_PACKET_SIZE) {
2295 ts->size_stat[1] ++;
2296 } else if (pos == TS_FEC_PACKET_SIZE) {
2297 ts->size_stat[2] ++;
2300 ts->size_stat_count ++;
2301 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2303 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2304 newsize = TS_PACKET_SIZE;
2305 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2306 newsize = TS_DVHS_PACKET_SIZE;
2307 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2308 newsize = TS_FEC_PACKET_SIZE;
2310 if (newsize && newsize != ts->raw_packet_size) {
2311 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2312 ts->raw_packet_size = newsize;
2314 ts->size_stat_count = 0;
2315 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2319 /* XXX: try to find a better synchro over several packets (use
2320 * get_packet_size() ?) */
2321 static int mpegts_resync(AVFormatContext *s)
2323 MpegTSContext *ts = s->priv_data;
2324 AVIOContext *pb = s->pb;
2327 for (i = 0; i < ts->resync_size; i++) {
2332 avio_seek(pb, -1, SEEK_CUR);
2333 reanalyze(s->priv_data);
2337 av_log(s, AV_LOG_ERROR,
2338 "max resync size reached, could not find sync byte\n");
2340 return AVERROR_INVALIDDATA;
2343 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2344 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2345 const uint8_t **data)
2347 AVIOContext *pb = s->pb;
2351 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2352 if (len != TS_PACKET_SIZE)
2353 return len < 0 ? len : AVERROR_EOF;
2354 /* check packet sync byte */
2355 if ((*data)[0] != 0x47) {
2356 /* find a new packet start */
2357 uint64_t pos = avio_tell(pb);
2358 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2360 if (mpegts_resync(s) < 0)
2361 return AVERROR(EAGAIN);
2371 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2373 AVIOContext *pb = s->pb;
2374 int skip = raw_packet_size - TS_PACKET_SIZE;
2376 avio_skip(pb, skip);
2379 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2381 AVFormatContext *s = ts->stream;
2382 uint8_t packet[TS_PACKET_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
2383 const uint8_t *data;
2387 if (avio_tell(s->pb) != ts->last_pos) {
2389 av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
2390 /* seek detected, flush pes buffer */
2391 for (i = 0; i < NB_PID_MAX; i++) {
2393 if (ts->pids[i]->type == MPEGTS_PES) {
2394 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2395 av_buffer_unref(&pes->buffer);
2396 pes->data_index = 0;
2397 pes->state = MPEGTS_SKIP; /* skip until pes header */
2398 } else if (ts->pids[i]->type == MPEGTS_SECTION) {
2399 ts->pids[i]->u.section_filter.last_ver = -1;
2401 ts->pids[i]->last_cc = -1;
2402 ts->pids[i]->last_pcr = -1;
2409 memset(packet + TS_PACKET_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
2412 if (nb_packets != 0 && packet_num >= nb_packets ||
2413 ts->stop_parse > 1) {
2414 ret = AVERROR(EAGAIN);
2417 if (ts->stop_parse > 0)
2420 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2423 ret = handle_packet(ts, data);
2424 finished_reading_packet(s, ts->raw_packet_size);
2428 ts->last_pos = avio_tell(s->pb);
2432 static int mpegts_probe(AVProbeData *p)
2434 const int size = p->buf_size;
2438 int check_count = size / TS_FEC_PACKET_SIZE;
2439 #define CHECK_COUNT 10
2440 #define CHECK_BLOCK 100
2442 if (check_count < CHECK_COUNT)
2445 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2446 int left = FFMIN(check_count - i, CHECK_BLOCK);
2447 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL, 1);
2448 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL, 1);
2449 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL, 1);
2450 score = FFMAX3(score, dvhs_score, fec_score);
2452 maxscore = FFMAX(maxscore, score);
2455 sumscore = sumscore * CHECK_COUNT / check_count;
2456 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2458 ff_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2460 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2461 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2466 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2467 * (-1) if not available */
2468 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2470 int afc, len, flags;
2474 afc = (packet[3] >> 4) & 3;
2476 return AVERROR_INVALIDDATA;
2481 return AVERROR_INVALIDDATA;
2484 if (!(flags & 0x10))
2485 return AVERROR_INVALIDDATA;
2487 return AVERROR_INVALIDDATA;
2489 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2490 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2494 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2496 /* NOTE: We attempt to seek on non-seekable files as well, as the
2497 * probe buffer usually is big enough. Only warn if the seek failed
2498 * on files where the seek should work. */
2499 if (avio_seek(pb, pos, SEEK_SET) < 0)
2500 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2503 static int mpegts_read_header(AVFormatContext *s)
2505 MpegTSContext *ts = s->priv_data;
2506 AVIOContext *pb = s->pb;
2507 uint8_t buf[8 * 1024] = {0};
2509 int64_t pos, probesize = s->probesize;
2511 if (ffio_ensure_seekback(pb, probesize) < 0)
2512 av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
2514 /* read the first 8192 bytes to get packet size */
2515 pos = avio_tell(pb);
2516 len = avio_read(pb, buf, sizeof(buf));
2517 ts->raw_packet_size = get_packet_size(buf, len);
2518 if (ts->raw_packet_size <= 0) {
2519 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2520 ts->raw_packet_size = TS_PACKET_SIZE;
2525 if (s->iformat == &ff_mpegts_demuxer) {
2528 /* first do a scan to get all the services */
2529 seek_back(s, pb, pos);
2531 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2533 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2535 handle_packets(ts, probesize / ts->raw_packet_size);
2536 /* if could not find service, enable auto_guess */
2540 av_log(ts->stream, AV_LOG_TRACE, "tuning done\n");
2542 s->ctx_flags |= AVFMTCTX_NOHEADER;
2545 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2546 int64_t pcrs[2], pcr_h;
2547 int packet_count[2];
2548 uint8_t packet[TS_PACKET_SIZE];
2549 const uint8_t *data;
2551 /* only read packets */
2553 st = avformat_new_stream(s, NULL);
2555 return AVERROR(ENOMEM);
2556 avpriv_set_pts_info(st, 60, 1, 27000000);
2557 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2558 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2560 /* we iterate until we find two PCRs to estimate the bitrate */
2565 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2568 pid = AV_RB16(data + 1) & 0x1fff;
2569 if ((pcr_pid == -1 || pcr_pid == pid) &&
2570 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2571 finished_reading_packet(s, ts->raw_packet_size);
2573 packet_count[nb_pcrs] = nb_packets;
2574 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2579 finished_reading_packet(s, ts->raw_packet_size);
2584 /* NOTE1: the bitrate is computed without the FEC */
2585 /* NOTE2: it is only the bitrate of the start of the stream */
2586 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2587 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2588 s->bit_rate = TS_PACKET_SIZE * 8 * 27000000LL / ts->pcr_incr;
2589 st->codec->bit_rate = s->bit_rate;
2590 st->start_time = ts->cur_pcr;
2591 av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%d\n",
2592 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2595 seek_back(s, pb, pos);
2599 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2601 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2603 MpegTSContext *ts = s->priv_data;
2605 int64_t pcr_h, next_pcr_h, pos;
2606 int pcr_l, next_pcr_l;
2607 uint8_t pcr_buf[12];
2608 const uint8_t *data;
2610 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2611 return AVERROR(ENOMEM);
2612 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2613 pkt->pos = avio_tell(s->pb);
2615 av_packet_unref(pkt);
2618 if (data != pkt->data)
2619 memcpy(pkt->data, data, ts->raw_packet_size);
2620 finished_reading_packet(s, ts->raw_packet_size);
2621 if (ts->mpeg2ts_compute_pcr) {
2622 /* compute exact PCR for each packet */
2623 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2624 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2625 pos = avio_tell(s->pb);
2626 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2627 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2628 avio_read(s->pb, pcr_buf, 12);
2629 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2630 /* XXX: not precise enough */
2632 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2637 avio_seek(s->pb, pos, SEEK_SET);
2638 /* no next PCR found: we use previous increment */
2639 ts->cur_pcr = pcr_h * 300 + pcr_l;
2641 pkt->pts = ts->cur_pcr;
2642 pkt->duration = ts->pcr_incr;
2643 ts->cur_pcr += ts->pcr_incr;
2645 pkt->stream_index = 0;
2649 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2651 MpegTSContext *ts = s->priv_data;
2656 ret = handle_packets(ts, 0);
2658 av_packet_unref(ts->pkt);
2659 /* flush pes data left */
2660 for (i = 0; i < NB_PID_MAX; i++)
2661 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2662 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2663 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2664 new_pes_packet(pes, pkt);
2665 pes->state = MPEGTS_SKIP;
2672 if (!ret && pkt->size < 0)
2673 ret = AVERROR_INVALIDDATA;
2677 static void mpegts_free(MpegTSContext *ts)
2683 for (i = 0; i < NB_PID_MAX; i++)
2685 mpegts_close_filter(ts, ts->pids[i]);
2688 static int mpegts_read_close(AVFormatContext *s)
2690 MpegTSContext *ts = s->priv_data;
2695 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2696 int64_t *ppos, int64_t pos_limit)
2698 MpegTSContext *ts = s->priv_data;
2699 int64_t pos, timestamp;
2700 uint8_t buf[TS_PACKET_SIZE];
2701 int pcr_l, pcr_pid =
2702 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2703 int pos47 = ts->pos47_full % ts->raw_packet_size;
2705 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2706 ts->raw_packet_size + pos47;
2707 while(pos < pos_limit) {
2708 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2709 return AV_NOPTS_VALUE;
2710 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2711 return AV_NOPTS_VALUE;
2712 if (buf[0] != 0x47) {
2713 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2714 if (mpegts_resync(s) < 0)
2715 return AV_NOPTS_VALUE;
2716 pos = avio_tell(s->pb);
2719 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2720 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2724 pos += ts->raw_packet_size;
2727 return AV_NOPTS_VALUE;
2730 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2731 int64_t *ppos, int64_t pos_limit)
2733 MpegTSContext *ts = s->priv_data;
2735 int pos47 = ts->pos47_full % ts->raw_packet_size;
2736 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2737 ff_read_frame_flush(s);
2738 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2739 return AV_NOPTS_VALUE;
2740 while(pos < pos_limit) {
2743 av_init_packet(&pkt);
2744 ret = av_read_frame(s, &pkt);
2746 return AV_NOPTS_VALUE;
2747 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2748 ff_reduce_index(s, pkt.stream_index);
2749 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2750 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2751 int64_t dts = pkt.dts;
2753 av_packet_unref(&pkt);
2758 av_packet_unref(&pkt);
2761 return AV_NOPTS_VALUE;
2764 /**************************************************************/
2765 /* parsing functions - called from other demuxers such as RTP */
2767 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
2771 ts = av_mallocz(sizeof(MpegTSContext));
2774 /* no stream case, currently used by RTP */
2775 ts->raw_packet_size = TS_PACKET_SIZE;
2778 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2779 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2784 /* return the consumed length if a packet was output, or -1 if no
2785 * packet is output */
2786 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2787 const uint8_t *buf, int len)
2795 if (len < TS_PACKET_SIZE)
2796 return AVERROR_INVALIDDATA;
2797 if (buf[0] != 0x47) {
2801 handle_packet(ts, buf);
2802 buf += TS_PACKET_SIZE;
2803 len -= TS_PACKET_SIZE;
2804 if (ts->stop_parse == 1)
2811 void avpriv_mpegts_parse_close(MpegTSContext *ts)
2817 AVInputFormat ff_mpegts_demuxer = {
2819 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2820 .priv_data_size = sizeof(MpegTSContext),
2821 .read_probe = mpegts_probe,
2822 .read_header = mpegts_read_header,
2823 .read_packet = mpegts_read_packet,
2824 .read_close = mpegts_read_close,
2825 .read_timestamp = mpegts_get_dts,
2826 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2827 .priv_class = &mpegts_class,
2830 AVInputFormat ff_mpegtsraw_demuxer = {
2831 .name = "mpegtsraw",
2832 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2833 .priv_data_size = sizeof(MpegTSContext),
2834 .read_header = mpegts_read_header,
2835 .read_packet = mpegts_raw_read_packet,
2836 .read_close = mpegts_read_close,
2837 .read_timestamp = mpegts_get_dts,
2838 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2839 .priv_class = &mpegtsraw_class,