2 * MPEG-2 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 "libavutil/dovi_meta.h"
32 #include "libavcodec/bytestream.h"
33 #include "libavcodec/get_bits.h"
34 #include "libavcodec/opus.h"
38 #include "avio_internal.h"
45 /* maximum size in which we look for synchronization if
46 * synchronization is lost */
47 #define MAX_RESYNC_SIZE 65536
49 #define MAX_PES_PAYLOAD 200 * 1024
51 #define MAX_MP4_DESCR_COUNT 16
53 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
55 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
56 (modulus) = (dividend) % (divisor); \
57 (prev_dividend) = (dividend); \
60 #define PROBE_PACKET_MAX_BUF 8192
61 #define PROBE_PACKET_MARGIN 5
63 enum MpegTSFilterType {
69 typedef struct MpegTSFilter MpegTSFilter;
71 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
72 int is_start, int64_t pos);
74 typedef struct MpegTSPESFilter {
79 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
81 typedef void SetServiceCallback (void *opaque, int ret);
83 typedef struct MpegTSSectionFilter {
90 unsigned int check_crc : 1;
91 unsigned int end_of_section_reached : 1;
92 SectionCallback *section_cb;
94 } MpegTSSectionFilter;
99 int last_cc; /* last cc code (-1 if first packet) */
102 enum MpegTSFilterType type;
104 MpegTSPESFilter pes_filter;
105 MpegTSSectionFilter section_filter;
109 #define MAX_PIDS_PER_PROGRAM 64
111 unsigned int id; // program id/service id
112 unsigned int nb_pids;
113 unsigned int pids[MAX_PIDS_PER_PROGRAM];
115 /** have we found pmt for this program */
119 struct MpegTSContext {
120 const AVClass *class;
122 AVFormatContext *stream;
123 /** raw packet size, including FEC if present */
128 /** if true, all pids are analyzed to find streams */
131 /** compute exact PCR for each transport stream packet */
132 int mpeg2ts_compute_pcr;
134 /** fix dvb teletext pts */
135 int fix_teletext_pts;
137 int64_t cur_pcr; /**< used to estimate the exact PCR */
138 int pcr_incr; /**< used to estimate the exact PCR */
140 /* data needed to handle file based ts */
141 /** stop parsing loop */
143 /** packet containing Audio/Video data */
145 /** to detect seek */
150 int skip_unknown_pmt;
155 int merge_pmt_versions;
157 /******************************************/
158 /* private mpegts data */
160 /** structure to keep track of Program->pids mapping */
164 int8_t crc_validity[NB_PID_MAX];
165 /** filters for various streams specified by PMT + for the PAT and PMT */
166 MpegTSFilter *pids[NB_PID_MAX];
169 AVStream *epg_stream;
170 AVBufferPool* pools[32];
173 #define MPEGTS_OPTIONS \
174 { "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 }
176 static const AVOption options[] = {
178 {"fix_teletext_pts", "try to fix pts values of dvb teletext streams", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_BOOL,
179 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
180 {"ts_packetsize", "output option carrying the raw packet size", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
181 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
182 {"scan_all_pmts", "scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_BOOL,
183 {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
184 {"skip_unknown_pmt", "skip PMTs for programs not advertised in the PAT", offsetof(MpegTSContext, skip_unknown_pmt), AV_OPT_TYPE_BOOL,
185 {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
186 {"merge_pmt_versions", "re-use streams when PMT's version/pids change", offsetof(MpegTSContext, merge_pmt_versions), AV_OPT_TYPE_BOOL,
187 {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
188 {"skip_changes", "skip changing / adding streams / programs", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_BOOL,
189 {.i64 = 0}, 0, 1, 0 },
190 {"skip_clear", "skip clearing programs", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_BOOL,
191 {.i64 = 0}, 0, 1, 0 },
195 static const AVClass mpegts_class = {
196 .class_name = "mpegts demuxer",
197 .item_name = av_default_item_name,
199 .version = LIBAVUTIL_VERSION_INT,
202 static const AVOption raw_options[] = {
204 { "compute_pcr", "compute exact PCR for each transport stream packet",
205 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_BOOL,
206 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
207 { "ts_packetsize", "output option carrying the raw packet size",
208 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
210 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
214 static const AVClass mpegtsraw_class = {
215 .class_name = "mpegtsraw demuxer",
216 .item_name = av_default_item_name,
217 .option = raw_options,
218 .version = LIBAVUTIL_VERSION_INT,
221 /* TS stream handling */
226 MPEGTS_PESHEADER_FILL,
231 /* enough for PES header + length */
232 #define PES_START_SIZE 6
233 #define PES_HEADER_SIZE 9
234 #define MAX_PES_HEADER_SIZE (9 + 255)
236 typedef struct PESContext {
238 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
241 AVFormatContext *stream;
243 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
244 enum MpegTSState state;
245 /* used to get the format */
247 int flags; /**< copied to the AVPacket flags */
250 int extended_stream_id;
253 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
254 uint8_t header[MAX_PES_HEADER_SIZE];
260 extern AVInputFormat ff_mpegts_demuxer;
262 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
265 for (i = 0; i < ts->nb_prg; i++) {
266 if (ts->prg[i].id == programid) {
273 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
275 AVProgram *prg = NULL;
278 for (i = 0; i < ts->stream->nb_programs; i++)
279 if (ts->stream->programs[i]->id == programid) {
280 prg = ts->stream->programs[i];
285 prg->nb_stream_indexes = 0;
288 static void clear_program(MpegTSContext *ts, unsigned int programid)
292 clear_avprogram(ts, programid);
293 for (i = 0; i < ts->nb_prg; i++)
294 if (ts->prg[i].id == programid) {
295 ts->prg[i].nb_pids = 0;
296 ts->prg[i].pmt_found = 0;
300 static void clear_programs(MpegTSContext *ts)
306 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
309 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
313 p = &ts->prg[ts->nb_prg];
320 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
323 struct Program *p = get_program(ts, programid);
328 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
331 for (i = 0; i < p->nb_pids; i++)
332 if (p->pids[i] == pid)
335 p->pids[p->nb_pids++] = pid;
338 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
340 struct Program *p = get_program(ts, programid);
347 static void update_av_program_info(AVFormatContext *s, unsigned int programid,
348 unsigned int pid, int version)
351 for (i = 0; i < s->nb_programs; i++) {
352 AVProgram *program = s->programs[i];
353 if (program->id == programid) {
354 int old_pcr_pid = program->pcr_pid,
355 old_version = program->pmt_version;
356 program->pcr_pid = pid;
357 program->pmt_version = version;
359 if (old_version != -1 && old_version != version) {
360 av_log(s, AV_LOG_VERBOSE,
361 "detected PMT change (program=%d, version=%d/%d, pcr_pid=0x%x/0x%x)\n",
362 programid, old_version, version, old_pcr_pid, pid);
370 * @brief discard_pid() decides if the pid is to be discarded according
371 * to caller's programs selection
372 * @param ts : - TS context
374 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
377 static int discard_pid(MpegTSContext *ts, unsigned int pid)
380 int used = 0, discarded = 0;
383 /* If none of the programs have .discard=AVDISCARD_ALL then there's
384 * no way we have to discard this packet */
385 for (k = 0; k < ts->stream->nb_programs; k++)
386 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
388 if (k == ts->stream->nb_programs)
391 for (i = 0; i < ts->nb_prg; i++) {
393 for (j = 0; j < p->nb_pids; j++) {
394 if (p->pids[j] != pid)
396 // is program with id p->id set to be discarded?
397 for (k = 0; k < ts->stream->nb_programs; k++) {
398 if (ts->stream->programs[k]->id == p->id) {
399 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
408 return !used && discarded;
412 * Assemble PES packets out of TS packets, and then call the "section_cb"
413 * function when they are complete.
415 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
416 const uint8_t *buf, int buf_size, int is_start)
418 MpegTSSectionFilter *tss = &tss1->u.section_filter;
419 uint8_t *cur_section_buf = NULL;
423 memcpy(tss->section_buf, buf, buf_size);
424 tss->section_index = buf_size;
425 tss->section_h_size = -1;
426 tss->end_of_section_reached = 0;
428 if (tss->end_of_section_reached)
430 len = MAX_SECTION_SIZE - tss->section_index;
433 memcpy(tss->section_buf + tss->section_index, buf, len);
434 tss->section_index += len;
438 cur_section_buf = tss->section_buf;
439 while (cur_section_buf - tss->section_buf < MAX_SECTION_SIZE && cur_section_buf[0] != 0xff) {
440 /* compute section length if possible */
441 if (tss->section_h_size == -1 && tss->section_index - offset >= 3) {
442 len = (AV_RB16(cur_section_buf + 1) & 0xfff) + 3;
443 if (len > MAX_SECTION_SIZE)
445 tss->section_h_size = len;
448 if (tss->section_h_size != -1 &&
449 tss->section_index >= offset + tss->section_h_size) {
451 tss->end_of_section_reached = 1;
453 if (tss->check_crc) {
454 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, cur_section_buf, tss->section_h_size);
455 if (tss->section_h_size >= 4)
456 tss->crc = AV_RB32(cur_section_buf + tss->section_h_size - 4);
459 ts->crc_validity[ tss1->pid ] = 100;
460 }else if (ts->crc_validity[ tss1->pid ] > -10) {
461 ts->crc_validity[ tss1->pid ]--;
466 tss->section_cb(tss1, cur_section_buf, tss->section_h_size);
471 cur_section_buf += tss->section_h_size;
472 offset += tss->section_h_size;
473 tss->section_h_size = -1;
475 tss->section_h_size = -1;
476 tss->end_of_section_reached = 0;
482 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
483 enum MpegTSFilterType type)
485 MpegTSFilter *filter;
487 av_log(ts->stream, AV_LOG_TRACE, "Filter: pid=0x%x type=%d\n", pid, type);
489 if (pid >= NB_PID_MAX || ts->pids[pid])
491 filter = av_mallocz(sizeof(MpegTSFilter));
494 ts->pids[pid] = filter;
499 filter->last_cc = -1;
500 filter->last_pcr= -1;
505 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
507 SectionCallback *section_cb,
511 MpegTSFilter *filter;
512 MpegTSSectionFilter *sec;
513 uint8_t *section_buf = av_mallocz(MAX_SECTION_SIZE);
518 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION))) {
519 av_free(section_buf);
522 sec = &filter->u.section_filter;
523 sec->section_cb = section_cb;
524 sec->opaque = opaque;
525 sec->section_buf = section_buf;
526 sec->check_crc = check_crc;
532 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
536 MpegTSFilter *filter;
537 MpegTSPESFilter *pes;
539 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
542 pes = &filter->u.pes_filter;
543 pes->pes_cb = pes_cb;
544 pes->opaque = opaque;
548 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
550 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
553 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
558 if (filter->type == MPEGTS_SECTION)
559 av_freep(&filter->u.section_filter.section_buf);
560 else if (filter->type == MPEGTS_PES) {
561 PESContext *pes = filter->u.pes_filter.opaque;
562 av_buffer_unref(&pes->buffer);
563 /* referenced private data will be freed later in
564 * avformat_close_input (pes->st->priv_data == pes) */
565 if (!pes->st || pes->merged_st) {
566 av_freep(&filter->u.pes_filter.opaque);
571 ts->pids[pid] = NULL;
574 static int analyze(const uint8_t *buf, int size, int packet_size,
577 int stat[TS_MAX_PACKET_SIZE];
582 memset(stat, 0, packet_size * sizeof(*stat));
584 for (i = 0; i < size - 3; i++) {
585 if (buf[i] == 0x47) {
586 int pid = AV_RB16(buf+1) & 0x1FFF;
587 int asc = buf[i + 3] & 0x30;
588 if (!probe || pid == 0x1FFF || asc) {
589 int x = i % packet_size;
592 if (stat[x] > best_score) {
593 best_score = stat[x];
599 return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
602 /* autodetect fec presence */
603 static int get_packet_size(AVFormatContext* s)
605 int score, fec_score, dvhs_score;
609 /*init buffer to store stream for probing */
610 uint8_t buf[PROBE_PACKET_MAX_BUF] = {0};
613 while (buf_size < PROBE_PACKET_MAX_BUF) {
614 ret = avio_read_partial(s->pb, buf + buf_size, PROBE_PACKET_MAX_BUF - buf_size);
616 return AVERROR_INVALIDDATA;
619 score = analyze(buf, buf_size, TS_PACKET_SIZE, 0);
620 dvhs_score = analyze(buf, buf_size, TS_DVHS_PACKET_SIZE, 0);
621 fec_score = analyze(buf, buf_size, TS_FEC_PACKET_SIZE, 0);
622 av_log(s, AV_LOG_TRACE, "Probe: %d, score: %d, dvhs_score: %d, fec_score: %d \n",
623 buf_size, score, dvhs_score, fec_score);
625 margin = mid_pred(score, fec_score, dvhs_score);
627 if (buf_size < PROBE_PACKET_MAX_BUF)
628 margin += PROBE_PACKET_MARGIN; /*if buffer not filled */
631 return TS_PACKET_SIZE;
632 else if (dvhs_score > margin)
633 return TS_DVHS_PACKET_SIZE;
634 else if (fec_score > margin)
635 return TS_FEC_PACKET_SIZE;
637 return AVERROR_INVALIDDATA;
640 typedef struct SectionHeader {
645 uint8_t last_sec_num;
648 static int skip_identical(const SectionHeader *h, MpegTSSectionFilter *tssf)
650 if (h->version == tssf->last_ver && tssf->last_crc == tssf->crc)
653 tssf->last_ver = h->version;
654 tssf->last_crc = tssf->crc;
659 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
666 return AVERROR_INVALIDDATA;
672 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
679 return AVERROR_INVALIDDATA;
686 /* read and allocate a DVB string preceded by its length */
687 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
694 len = get8(&p, p_end);
701 const char *encodings[] = {
702 "ISO6937", "ISO-8859-5", "ISO-8859-6", "ISO-8859-7",
703 "ISO-8859-8", "ISO-8859-9", "ISO-8859-10", "ISO-8859-11",
704 "", "ISO-8859-13", "ISO-8859-14", "ISO-8859-15", "", "", "", "",
705 "", "UCS-2BE", "KSC_5601", "GB2312", "UCS-2BE", "UTF-8", "", "",
706 "", "", "", "", "", "", "", ""
710 size_t inlen = len, outlen = inlen * 6 + 1;
711 if (len >= 3 && p[0] == 0x10 && !p[1] && p[2] && p[2] <= 0xf && p[2] != 0xc) {
713 snprintf(iso8859, sizeof(iso8859), "ISO-8859-%d", p[2]);
716 cd = iconv_open("UTF-8", iso8859);
717 } else if (p[0] < 0x20) {
720 cd = iconv_open("UTF-8", encodings[*p]);
723 cd = iconv_open("UTF-8", encodings[0]);
725 if (cd == (iconv_t)-1)
727 str = out = av_malloc(outlen);
732 if (iconv(cd, &in, &inlen, &out, &outlen) == -1) {
744 str = av_malloc(len + 1);
754 static int parse_section_header(SectionHeader *h,
755 const uint8_t **pp, const uint8_t *p_end)
759 val = get8(pp, p_end);
764 val = get16(pp, p_end);
768 val = get8(pp, p_end);
771 h->version = (val >> 1) & 0x1f;
772 val = get8(pp, p_end);
776 val = get8(pp, p_end);
779 h->last_sec_num = val;
783 typedef struct StreamType {
784 uint32_t stream_type;
785 enum AVMediaType codec_type;
786 enum AVCodecID codec_id;
789 static const StreamType ISO_types[] = {
790 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
791 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
792 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
793 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
794 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
795 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
796 /* Makito encoder sets stream type 0x11 for AAC,
797 * so auto-detect LOAS/LATM instead of hardcoding it. */
798 #if !CONFIG_LOAS_DEMUXER
799 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
801 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
802 { 0x1c, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
803 { 0x20, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
804 { 0x21, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_JPEG2000 },
805 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
806 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
807 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
808 { 0xd2, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_AVS2 },
809 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
813 static const StreamType HDMV_types[] = {
814 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
815 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
816 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
817 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
818 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
819 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
820 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
821 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
822 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
823 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
824 { 0x92, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_TEXT_SUBTITLE },
829 static const StreamType SCTE_types[] = {
830 { 0x86, AVMEDIA_TYPE_DATA, AV_CODEC_ID_SCTE_35 },
835 static const StreamType MISC_types[] = {
836 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
837 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
841 static const StreamType REGD_types[] = {
842 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
843 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
844 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
845 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
846 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
847 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
848 { MKTAG('E', 'A', 'C', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
849 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
850 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
851 { MKTAG('I', 'D', '3', ' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
852 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
853 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
857 static const StreamType METADATA_types[] = {
858 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
859 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
863 /* descriptor present */
864 static const StreamType DESC_types[] = {
865 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
866 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
867 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
868 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
869 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
873 static void mpegts_find_stream_type(AVStream *st,
874 uint32_t stream_type,
875 const StreamType *types)
877 for (; types->stream_type; types++)
878 if (stream_type == types->stream_type) {
879 if (st->codecpar->codec_type != types->codec_type ||
880 st->codecpar->codec_id != types->codec_id) {
881 st->codecpar->codec_type = types->codec_type;
882 st->codecpar->codec_id = types->codec_id;
883 st->internal->need_context_update = 1;
885 st->request_probe = 0;
890 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
891 uint32_t stream_type, uint32_t prog_reg_desc)
893 int old_codec_type = st->codecpar->codec_type;
894 int old_codec_id = st->codecpar->codec_id;
895 int old_codec_tag = st->codecpar->codec_tag;
897 if (avcodec_is_open(st->internal->avctx)) {
898 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, internal codec is open\n");
902 avpriv_set_pts_info(st, 33, 1, 90000);
904 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
905 st->codecpar->codec_id = AV_CODEC_ID_NONE;
906 st->need_parsing = AVSTREAM_PARSE_FULL;
908 pes->stream_type = stream_type;
910 av_log(pes->stream, AV_LOG_DEBUG,
911 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
912 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
914 st->codecpar->codec_tag = pes->stream_type;
916 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
917 if (pes->stream_type == 4 || pes->stream_type == 0x0f)
918 st->request_probe = 50;
919 if ((prog_reg_desc == AV_RL32("HDMV") ||
920 prog_reg_desc == AV_RL32("HDPR")) &&
921 st->codecpar->codec_id == AV_CODEC_ID_NONE) {
922 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
923 if (pes->stream_type == 0x83) {
924 // HDMV TrueHD streams also contain an AC3 coded version of the
925 // audio track - add a second stream for this
927 // priv_data cannot be shared between streams
928 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
930 return AVERROR(ENOMEM);
931 memcpy(sub_pes, pes, sizeof(*sub_pes));
933 sub_st = avformat_new_stream(pes->stream, NULL);
936 return AVERROR(ENOMEM);
939 sub_st->id = pes->pid;
940 avpriv_set_pts_info(sub_st, 33, 1, 90000);
941 sub_st->priv_data = sub_pes;
942 sub_st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
943 sub_st->codecpar->codec_id = AV_CODEC_ID_AC3;
944 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
945 sub_pes->sub_st = pes->sub_st = sub_st;
948 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
949 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
950 if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
951 st->codecpar->codec_id = old_codec_id;
952 st->codecpar->codec_type = old_codec_type;
954 if ((st->codecpar->codec_id == AV_CODEC_ID_NONE ||
955 (st->request_probe > 0 && st->request_probe < AVPROBE_SCORE_STREAM_RETRY / 5)) &&
956 st->probe_packets > 0 &&
957 stream_type == STREAM_TYPE_PRIVATE_DATA) {
958 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
959 st->codecpar->codec_id = AV_CODEC_ID_BIN_DATA;
960 st->request_probe = AVPROBE_SCORE_STREAM_RETRY / 5;
963 /* queue a context update if properties changed */
964 if (old_codec_type != st->codecpar->codec_type ||
965 old_codec_id != st->codecpar->codec_id ||
966 old_codec_tag != st->codecpar->codec_tag)
967 st->internal->need_context_update = 1;
972 static void reset_pes_packet_state(PESContext *pes)
974 pes->pts = AV_NOPTS_VALUE;
975 pes->dts = AV_NOPTS_VALUE;
978 av_buffer_unref(&pes->buffer);
981 static void new_data_packet(const uint8_t *buffer, int len, AVPacket *pkt)
984 pkt->data = (uint8_t *)buffer;
988 static int new_pes_packet(PESContext *pes, AVPacket *pkt)
994 pkt->buf = pes->buffer;
995 pkt->data = pes->buffer->data;
996 pkt->size = pes->data_index;
998 if (pes->total_size != MAX_PES_PAYLOAD &&
999 pes->pes_header_size + pes->data_index != pes->total_size +
1001 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
1002 pes->flags |= AV_PKT_FLAG_CORRUPT;
1004 memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1006 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
1007 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
1008 pkt->stream_index = pes->sub_st->index;
1010 pkt->stream_index = pes->st->index;
1011 pkt->pts = pes->pts;
1012 pkt->dts = pes->dts;
1013 /* store position of first TS packet of this PES packet */
1014 pkt->pos = pes->ts_packet_pos;
1015 pkt->flags = pes->flags;
1018 reset_pes_packet_state(pes);
1020 sd = av_packet_new_side_data(pkt, AV_PKT_DATA_MPEGTS_STREAM_ID, 1);
1022 return AVERROR(ENOMEM);
1023 *sd = pes->stream_id;
1028 static uint64_t get_ts64(GetBitContext *gb, int bits)
1030 if (get_bits_left(gb) < bits)
1031 return AV_NOPTS_VALUE;
1032 return get_bits64(gb, bits);
1035 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
1036 const uint8_t *buf, int buf_size)
1039 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
1040 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
1041 int dts_flag = -1, cts_flag = -1;
1042 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
1043 uint8_t buf_padded[128 + AV_INPUT_BUFFER_PADDING_SIZE];
1044 int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - AV_INPUT_BUFFER_PADDING_SIZE);
1046 memcpy(buf_padded, buf, buf_padded_size);
1048 init_get_bits(&gb, buf_padded, buf_padded_size * 8);
1050 if (sl->use_au_start)
1051 au_start_flag = get_bits1(&gb);
1053 au_end_flag = get_bits1(&gb);
1054 if (!sl->use_au_start && !sl->use_au_end)
1055 au_start_flag = au_end_flag = 1;
1056 if (sl->ocr_len > 0)
1057 ocr_flag = get_bits1(&gb);
1059 idle_flag = get_bits1(&gb);
1060 if (sl->use_padding)
1061 padding_flag = get_bits1(&gb);
1063 padding_bits = get_bits(&gb, 3);
1065 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
1066 if (sl->packet_seq_num_len)
1067 skip_bits_long(&gb, sl->packet_seq_num_len);
1068 if (sl->degr_prior_len)
1070 skip_bits(&gb, sl->degr_prior_len);
1072 skip_bits_long(&gb, sl->ocr_len);
1073 if (au_start_flag) {
1074 if (sl->use_rand_acc_pt)
1076 if (sl->au_seq_num_len > 0)
1077 skip_bits_long(&gb, sl->au_seq_num_len);
1078 if (sl->use_timestamps) {
1079 dts_flag = get_bits1(&gb);
1080 cts_flag = get_bits1(&gb);
1083 if (sl->inst_bitrate_len)
1084 inst_bitrate_flag = get_bits1(&gb);
1086 dts = get_ts64(&gb, sl->timestamp_len);
1088 cts = get_ts64(&gb, sl->timestamp_len);
1090 skip_bits_long(&gb, sl->au_len);
1091 if (inst_bitrate_flag)
1092 skip_bits_long(&gb, sl->inst_bitrate_len);
1095 if (dts != AV_NOPTS_VALUE)
1097 if (cts != AV_NOPTS_VALUE)
1100 if (sl->timestamp_len && sl->timestamp_res)
1101 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
1103 return (get_bits_count(&gb) + 7) >> 3;
1106 static AVBufferRef *buffer_pool_get(MpegTSContext *ts, int size)
1108 int index = av_log2(size + AV_INPUT_BUFFER_PADDING_SIZE);
1109 if (!ts->pools[index]) {
1110 int pool_size = FFMIN(MAX_PES_PAYLOAD + AV_INPUT_BUFFER_PADDING_SIZE, 2 << index);
1111 ts->pools[index] = av_buffer_pool_init(pool_size, NULL);
1112 if (!ts->pools[index])
1115 return av_buffer_pool_get(ts->pools[index]);
1118 /* return non zero if a packet could be constructed */
1119 static int mpegts_push_data(MpegTSFilter *filter,
1120 const uint8_t *buf, int buf_size, int is_start,
1123 PESContext *pes = filter->u.pes_filter.opaque;
1124 MpegTSContext *ts = pes->ts;
1132 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1133 ret = new_pes_packet(pes, ts->pkt);
1138 reset_pes_packet_state(pes);
1140 pes->state = MPEGTS_HEADER;
1141 pes->ts_packet_pos = pos;
1144 while (buf_size > 0) {
1145 switch (pes->state) {
1147 len = PES_START_SIZE - pes->data_index;
1150 memcpy(pes->header + pes->data_index, p, len);
1151 pes->data_index += len;
1154 if (pes->data_index == PES_START_SIZE) {
1155 /* we got all the PES or section header. We can now
1157 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
1158 pes->header[2] == 0x01) {
1159 /* it must be an MPEG-2 PES stream */
1160 code = pes->header[3] | 0x100;
1161 av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
1163 pes->stream_id = pes->header[3];
1165 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
1167 pes->sub_st->discard == AVDISCARD_ALL)) ||
1168 code == 0x1be) /* padding_stream */
1171 /* stream not present in PMT */
1173 if (ts->skip_changes)
1175 if (ts->merge_pmt_versions)
1176 goto skip; /* wait for PMT to merge new stream */
1178 pes->st = avformat_new_stream(ts->stream, NULL);
1180 return AVERROR(ENOMEM);
1181 pes->st->id = pes->pid;
1182 mpegts_set_stream_info(pes->st, pes, 0, 0);
1185 pes->total_size = AV_RB16(pes->header + 4);
1186 /* NOTE: a zero total size means the PES size is
1188 if (!pes->total_size)
1189 pes->total_size = MAX_PES_PAYLOAD;
1191 /* allocate pes buffer */
1192 pes->buffer = buffer_pool_get(ts, pes->total_size);
1194 return AVERROR(ENOMEM);
1196 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1197 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1198 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1199 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1200 pes->state = MPEGTS_PESHEADER;
1201 if (pes->st->codecpar->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1202 av_log(pes->stream, AV_LOG_TRACE,
1203 "pid=%x stream_type=%x probing\n",
1206 pes->st->request_probe = 1;
1209 pes->pes_header_size = 6;
1210 pes->state = MPEGTS_PAYLOAD;
1211 pes->data_index = 0;
1214 /* otherwise, it should be a table */
1217 pes->state = MPEGTS_SKIP;
1222 /**********************************************/
1223 /* PES packing parsing */
1224 case MPEGTS_PESHEADER:
1225 len = PES_HEADER_SIZE - pes->data_index;
1227 return AVERROR_INVALIDDATA;
1230 memcpy(pes->header + pes->data_index, p, len);
1231 pes->data_index += len;
1234 if (pes->data_index == PES_HEADER_SIZE) {
1235 pes->pes_header_size = pes->header[8] + 9;
1236 pes->state = MPEGTS_PESHEADER_FILL;
1239 case MPEGTS_PESHEADER_FILL:
1240 len = pes->pes_header_size - pes->data_index;
1242 return AVERROR_INVALIDDATA;
1245 memcpy(pes->header + pes->data_index, p, len);
1246 pes->data_index += len;
1249 if (pes->data_index == pes->pes_header_size) {
1251 unsigned int flags, pes_ext, skip;
1253 flags = pes->header[7];
1254 r = pes->header + 9;
1255 pes->pts = AV_NOPTS_VALUE;
1256 pes->dts = AV_NOPTS_VALUE;
1257 if ((flags & 0xc0) == 0x80) {
1258 pes->dts = pes->pts = ff_parse_pes_pts(r);
1260 } else if ((flags & 0xc0) == 0xc0) {
1261 pes->pts = ff_parse_pes_pts(r);
1263 pes->dts = ff_parse_pes_pts(r);
1266 pes->extended_stream_id = -1;
1267 if (flags & 0x01) { /* PES extension */
1269 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1270 skip = (pes_ext >> 4) & 0xb;
1273 if ((pes_ext & 0x41) == 0x01 &&
1274 (r + 2) <= (pes->header + pes->pes_header_size)) {
1275 /* PES extension 2 */
1276 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1277 pes->extended_stream_id = r[1];
1281 /* we got the full header. We parse it and get the payload */
1282 pes->state = MPEGTS_PAYLOAD;
1283 pes->data_index = 0;
1284 if (pes->stream_type == 0x12 && buf_size > 0) {
1285 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1287 pes->pes_header_size += sl_header_bytes;
1288 p += sl_header_bytes;
1289 buf_size -= sl_header_bytes;
1291 if (pes->stream_type == 0x15 && buf_size >= 5) {
1292 /* skip metadata access unit header */
1293 pes->pes_header_size += 5;
1297 if ( pes->ts->fix_teletext_pts
1298 && ( pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT
1299 || pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
1301 AVProgram *p = NULL;
1303 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1304 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1305 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1307 AVStream *st = NULL;
1308 if (f->type == MPEGTS_PES) {
1309 PESContext *pcrpes = f->u.pes_filter.opaque;
1312 } else if (f->type == MPEGTS_PCR) {
1314 for (i = 0; i < p->nb_stream_indexes; i++) {
1315 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1316 if (pst->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
1320 if (f->last_pcr != -1 && !f->discard) {
1321 // teletext packets do not always have correct timestamps,
1322 // the standard says they should be handled after 40.6 ms at most,
1323 // and the pcr error to this packet should be no more than 100 ms.
1324 // TODO: we should interpolate the PCR, not just use the last one
1325 int64_t pcr = f->last_pcr / 300;
1328 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1329 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1331 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1332 pes->pts = pes->dts = pcr;
1333 } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT &&
1334 pes->dts > pcr + 3654 + 9000) {
1335 pes->pts = pes->dts = pcr + 3654 + 9000;
1336 } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE &&
1337 pes->dts > pcr + 10*90000) { //10sec
1338 pes->pts = pes->dts = pcr + 3654 + 9000;
1347 av_log(pes->stream, AV_LOG_VERBOSE,
1348 "Forcing DTS/PTS to be unset for a "
1349 "non-trustworthy PES packet for PID %d as "
1350 "PCR hasn't been received yet.\n",
1352 pes->dts = pes->pts = AV_NOPTS_VALUE;
1357 case MPEGTS_PAYLOAD:
1359 if (pes->data_index > 0 &&
1360 pes->data_index + buf_size > pes->total_size) {
1361 ret = new_pes_packet(pes, ts->pkt);
1364 pes->total_size = MAX_PES_PAYLOAD;
1365 pes->buffer = buffer_pool_get(ts, pes->total_size);
1367 return AVERROR(ENOMEM);
1369 } else if (pes->data_index == 0 &&
1370 buf_size > pes->total_size) {
1371 // pes packet size is < ts size packet and pes data is padded with 0xff
1372 // not sure if this is legal in ts but see issue #2392
1373 buf_size = pes->total_size;
1375 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1376 pes->data_index += buf_size;
1377 /* emit complete packets with known packet size
1378 * decreases demuxer delay for infrequent packets like subtitles from
1379 * a couple of seconds to milliseconds for properly muxed files.
1380 * total_size is the number of bytes following pes_packet_length
1381 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1382 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1383 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1385 ret = new_pes_packet(pes, ts->pkt);
1401 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1406 /* if no pid found, then add a pid context */
1407 pes = av_mallocz(sizeof(PESContext));
1411 pes->stream = ts->stream;
1413 pes->pcr_pid = pcr_pid;
1414 pes->state = MPEGTS_SKIP;
1415 pes->pts = AV_NOPTS_VALUE;
1416 pes->dts = AV_NOPTS_VALUE;
1417 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1426 typedef struct MP4DescrParseContext {
1430 Mp4Descr *active_descr;
1432 int max_descr_count;
1434 int predefined_SLConfigDescriptor_seen;
1435 } MP4DescrParseContext;
1437 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1438 const uint8_t *buf, unsigned size,
1439 Mp4Descr *descr, int max_descr_count)
1442 if (size > (1 << 30))
1443 return AVERROR_INVALIDDATA;
1445 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1446 NULL, NULL, NULL, NULL)) < 0)
1453 d->active_descr = NULL;
1454 d->max_descr_count = max_descr_count;
1459 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1461 int64_t new_off = avio_tell(pb);
1462 (*len) -= new_off - *off;
1466 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1469 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1472 int ret = parse_mp4_descr(d, off, len, 0);
1475 update_offsets(&d->pb, &off, &len);
1480 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1482 avio_rb16(&d->pb); // ID
1488 update_offsets(&d->pb, &off, &len);
1489 return parse_mp4_descr_arr(d, off, len);
1492 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1497 id_flags = avio_rb16(&d->pb);
1498 if (!(id_flags & 0x0020)) { // URL_Flag
1499 update_offsets(&d->pb, &off, &len);
1500 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1506 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1511 if (d->descr_count >= d->max_descr_count)
1512 return AVERROR_INVALIDDATA;
1513 ff_mp4_parse_es_descr(&d->pb, &es_id);
1514 d->active_descr = d->descr + (d->descr_count++);
1516 d->active_descr->es_id = es_id;
1517 update_offsets(&d->pb, &off, &len);
1518 if ((ret = parse_mp4_descr(d, off, len, MP4DecConfigDescrTag)) < 0)
1520 update_offsets(&d->pb, &off, &len);
1522 ret = parse_mp4_descr(d, off, len, MP4SLDescrTag);
1523 d->active_descr = NULL;
1527 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1530 Mp4Descr *descr = d->active_descr;
1532 return AVERROR_INVALIDDATA;
1533 d->active_descr->dec_config_descr = av_malloc(len);
1534 if (!descr->dec_config_descr)
1535 return AVERROR(ENOMEM);
1536 descr->dec_config_descr_len = len;
1537 avio_read(&d->pb, descr->dec_config_descr, len);
1541 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1543 Mp4Descr *descr = d->active_descr;
1546 return AVERROR_INVALIDDATA;
1548 #define R8_CHECK_CLIP_MAX(dst, maxv) do { \
1549 descr->sl.dst = avio_r8(&d->pb); \
1550 if (descr->sl.dst > maxv) { \
1551 descr->sl.dst = maxv; \
1552 return AVERROR_INVALIDDATA; \
1556 predefined = avio_r8(&d->pb);
1559 int flags = avio_r8(&d->pb);
1560 descr->sl.use_au_start = !!(flags & 0x80);
1561 descr->sl.use_au_end = !!(flags & 0x40);
1562 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1563 descr->sl.use_padding = !!(flags & 0x08);
1564 descr->sl.use_timestamps = !!(flags & 0x04);
1565 descr->sl.use_idle = !!(flags & 0x02);
1566 descr->sl.timestamp_res = avio_rb32(&d->pb);
1568 R8_CHECK_CLIP_MAX(timestamp_len, 63);
1569 R8_CHECK_CLIP_MAX(ocr_len, 63);
1570 R8_CHECK_CLIP_MAX(au_len, 31);
1571 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1572 lengths = avio_rb16(&d->pb);
1573 descr->sl.degr_prior_len = lengths >> 12;
1574 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1575 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1576 } else if (!d->predefined_SLConfigDescriptor_seen){
1577 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1578 d->predefined_SLConfigDescriptor_seen = 1;
1583 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1587 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1590 update_offsets(&d->pb, &off, &len);
1591 if (len < 0 || len1 > len || len1 <= 0) {
1592 av_log(d->s, AV_LOG_ERROR,
1593 "Tag %x length violation new length %d bytes remaining %d\n",
1595 return AVERROR_INVALIDDATA;
1598 if (d->level++ >= MAX_LEVEL) {
1599 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1600 ret = AVERROR_INVALIDDATA;
1604 if (target_tag && tag != target_tag) {
1605 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1607 ret = AVERROR_INVALIDDATA;
1613 ret = parse_MP4IODescrTag(d, off, len1);
1616 ret = parse_MP4ODescrTag(d, off, len1);
1619 ret = parse_MP4ESDescrTag(d, off, len1);
1621 case MP4DecConfigDescrTag:
1622 ret = parse_MP4DecConfigDescrTag(d, off, len1);
1625 ret = parse_MP4SLDescrTag(d, off, len1);
1632 avio_seek(&d->pb, off + len1, SEEK_SET);
1636 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1637 Mp4Descr *descr, int *descr_count, int max_descr_count)
1639 MP4DescrParseContext d;
1642 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1646 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1648 *descr_count = d.descr_count;
1652 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1653 Mp4Descr *descr, int *descr_count, int max_descr_count)
1655 MP4DescrParseContext d;
1658 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1662 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1664 *descr_count = d.descr_count;
1668 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1671 MpegTSContext *ts = filter->u.section_filter.opaque;
1672 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1674 const uint8_t *p, *p_end;
1676 int mp4_descr_count = 0;
1677 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1679 AVFormatContext *s = ts->stream;
1681 p_end = section + section_len - 4;
1683 if (parse_section_header(&h, &p, p_end) < 0)
1685 if (h.tid != M4OD_TID)
1687 if (skip_identical(&h, tssf))
1690 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1691 MAX_MP4_DESCR_COUNT);
1693 for (pid = 0; pid < NB_PID_MAX; pid++) {
1696 for (i = 0; i < mp4_descr_count; i++) {
1699 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1701 if (ts->pids[pid]->type != MPEGTS_PES) {
1702 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1705 pes = ts->pids[pid]->u.pes_filter.opaque;
1710 pes->sl = mp4_descr[i].sl;
1712 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1713 mp4_descr[i].dec_config_descr_len, 0,
1714 NULL, NULL, NULL, NULL);
1715 ff_mp4_read_dec_config_descr(s, st, &pb);
1716 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1717 st->codecpar->extradata_size > 0)
1718 st->need_parsing = 0;
1719 if (st->codecpar->codec_id == AV_CODEC_ID_H264 &&
1720 st->codecpar->extradata_size > 0)
1721 st->need_parsing = 0;
1723 st->codecpar->codec_type = avcodec_get_type(st->codecpar->codec_id);
1724 st->internal->need_context_update = 1;
1727 for (i = 0; i < mp4_descr_count; i++)
1728 av_free(mp4_descr[i].dec_config_descr);
1731 static void scte_data_cb(MpegTSFilter *filter, const uint8_t *section,
1734 AVProgram *prg = NULL;
1735 MpegTSContext *ts = filter->u.section_filter.opaque;
1737 int idx = ff_find_stream_index(ts->stream, filter->pid);
1742 * In case we receive an SCTE-35 packet before mpegts context is fully
1748 new_data_packet(section, section_len, ts->pkt);
1749 ts->pkt->stream_index = idx;
1750 prg = av_find_program_from_stream(ts->stream, NULL, idx);
1751 if (prg && prg->pcr_pid != -1 && prg->discard != AVDISCARD_ALL) {
1752 MpegTSFilter *f = ts->pids[prg->pcr_pid];
1753 if (f && f->last_pcr != -1)
1754 ts->pkt->pts = ts->pkt->dts = f->last_pcr/300;
1760 static const uint8_t opus_coupled_stream_cnt[9] = {
1761 1, 0, 1, 1, 2, 2, 2, 3, 3
1764 static const uint8_t opus_stream_cnt[9] = {
1765 1, 1, 1, 2, 2, 3, 4, 4, 5,
1768 static const uint8_t opus_channel_map[8][8] = {
1776 { 0,6,1,2,3,4,5,7 },
1779 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1780 const uint8_t **pp, const uint8_t *desc_list_end,
1781 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1784 const uint8_t *desc_end;
1785 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1789 desc_tag = get8(pp, desc_list_end);
1791 return AVERROR_INVALIDDATA;
1792 desc_len = get8(pp, desc_list_end);
1794 return AVERROR_INVALIDDATA;
1795 desc_end = *pp + desc_len;
1796 if (desc_end > desc_list_end)
1797 return AVERROR_INVALIDDATA;
1799 av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1801 if ((st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1802 stream_type == STREAM_TYPE_PRIVATE_DATA)
1803 mpegts_find_stream_type(st, desc_tag, DESC_types);
1806 case 0x02: /* video stream descriptor */
1807 if (get8(pp, desc_end) & 0x1) {
1808 st->disposition |= AV_DISPOSITION_STILL_IMAGE;
1811 case 0x1E: /* SL descriptor */
1812 desc_es_id = get16(pp, desc_end);
1815 if (ts && ts->pids[pid])
1816 ts->pids[pid]->es_id = desc_es_id;
1817 for (i = 0; i < mp4_descr_count; i++)
1818 if (mp4_descr[i].dec_config_descr_len &&
1819 mp4_descr[i].es_id == desc_es_id) {
1821 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1822 mp4_descr[i].dec_config_descr_len, 0,
1823 NULL, NULL, NULL, NULL);
1824 ff_mp4_read_dec_config_descr(fc, st, &pb);
1825 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1826 st->codecpar->extradata_size > 0) {
1827 st->need_parsing = 0;
1828 st->internal->need_context_update = 1;
1830 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1831 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1834 case 0x1F: /* FMC descriptor */
1835 if (get16(pp, desc_end) < 0)
1837 if (mp4_descr_count > 0 &&
1838 (st->codecpar->codec_id == AV_CODEC_ID_AAC_LATM ||
1839 (st->request_probe == 0 && st->codecpar->codec_id == AV_CODEC_ID_NONE) ||
1840 st->request_probe > 0) &&
1841 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1843 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1844 mp4_descr->dec_config_descr_len, 0,
1845 NULL, NULL, NULL, NULL);
1846 ff_mp4_read_dec_config_descr(fc, st, &pb);
1847 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1848 st->codecpar->extradata_size > 0) {
1849 st->request_probe = st->need_parsing = 0;
1850 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
1851 st->internal->need_context_update = 1;
1855 case 0x56: /* DVB teletext descriptor */
1857 uint8_t *extradata = NULL;
1858 int language_count = desc_len / 5, ret;
1860 if (desc_len > 0 && desc_len % 5 != 0)
1861 return AVERROR_INVALIDDATA;
1863 if (language_count > 0) {
1864 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1865 av_assert0(language_count <= sizeof(language) / 4);
1867 if (st->codecpar->extradata == NULL) {
1868 ret = ff_alloc_extradata(st->codecpar, language_count * 2);
1873 if (st->codecpar->extradata_size < language_count * 2)
1874 return AVERROR_INVALIDDATA;
1876 extradata = st->codecpar->extradata;
1878 for (i = 0; i < language_count; i++) {
1879 language[i * 4 + 0] = get8(pp, desc_end);
1880 language[i * 4 + 1] = get8(pp, desc_end);
1881 language[i * 4 + 2] = get8(pp, desc_end);
1882 language[i * 4 + 3] = ',';
1884 memcpy(extradata, *pp, 2);
1890 language[i * 4 - 1] = 0;
1891 av_dict_set(&st->metadata, "language", language, 0);
1892 st->internal->need_context_update = 1;
1896 case 0x59: /* subtitling descriptor */
1898 /* 8 bytes per DVB subtitle substream data:
1899 * ISO_639_language_code (3 bytes),
1900 * subtitling_type (1 byte),
1901 * composition_page_id (2 bytes),
1902 * ancillary_page_id (2 bytes) */
1903 int language_count = desc_len / 8, ret;
1905 if (desc_len > 0 && desc_len % 8 != 0)
1906 return AVERROR_INVALIDDATA;
1908 if (language_count > 1) {
1909 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1912 if (language_count > 0) {
1915 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1916 av_assert0(language_count <= sizeof(language) / 4);
1918 if (st->codecpar->extradata == NULL) {
1919 ret = ff_alloc_extradata(st->codecpar, language_count * 5);
1924 if (st->codecpar->extradata_size < language_count * 5)
1925 return AVERROR_INVALIDDATA;
1927 extradata = st->codecpar->extradata;
1929 for (i = 0; i < language_count; i++) {
1930 language[i * 4 + 0] = get8(pp, desc_end);
1931 language[i * 4 + 1] = get8(pp, desc_end);
1932 language[i * 4 + 2] = get8(pp, desc_end);
1933 language[i * 4 + 3] = ',';
1935 /* hearing impaired subtitles detection using subtitling_type */
1937 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1938 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1939 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1940 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1941 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1942 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1943 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1947 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1948 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1954 language[i * 4 - 1] = 0;
1955 av_dict_set(&st->metadata, "language", language, 0);
1956 st->internal->need_context_update = 1;
1960 case 0x0a: /* ISO 639 language descriptor */
1961 for (i = 0; i + 4 <= desc_len; i += 4) {
1962 language[i + 0] = get8(pp, desc_end);
1963 language[i + 1] = get8(pp, desc_end);
1964 language[i + 2] = get8(pp, desc_end);
1965 language[i + 3] = ',';
1966 switch (get8(pp, desc_end)) {
1968 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1971 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1974 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1975 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
1979 if (i && language[0]) {
1980 language[i - 1] = 0;
1981 /* don't overwrite language, as it may already have been set by
1982 * another, more specific descriptor (e.g. supplementary audio) */
1983 av_dict_set(&st->metadata, "language", language, AV_DICT_DONT_OVERWRITE);
1986 case 0x05: /* registration descriptor */
1987 st->codecpar->codec_tag = bytestream_get_le32(pp);
1988 av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codecpar->codec_tag);
1989 if (st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) {
1990 mpegts_find_stream_type(st, st->codecpar->codec_tag, REGD_types);
1991 if (st->codecpar->codec_tag == MKTAG('B', 'S', 'S', 'D'))
1992 st->request_probe = 50;
1995 case 0x52: /* stream identifier descriptor */
1996 st->stream_identifier = 1 + get8(pp, desc_end);
1998 case 0x26: /* metadata descriptor */
1999 if (get16(pp, desc_end) == 0xFFFF)
2001 if (get8(pp, desc_end) == 0xFF) {
2002 st->codecpar->codec_tag = bytestream_get_le32(pp);
2003 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
2004 mpegts_find_stream_type(st, st->codecpar->codec_tag, METADATA_types);
2007 case 0x7f: /* DVB extension descriptor */
2008 ext_desc_tag = get8(pp, desc_end);
2009 if (ext_desc_tag < 0)
2010 return AVERROR_INVALIDDATA;
2011 if (st->codecpar->codec_id == AV_CODEC_ID_OPUS &&
2012 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
2013 if (!st->codecpar->extradata) {
2014 st->codecpar->extradata = av_mallocz(sizeof(opus_default_extradata) +
2015 AV_INPUT_BUFFER_PADDING_SIZE);
2016 if (!st->codecpar->extradata)
2017 return AVERROR(ENOMEM);
2019 st->codecpar->extradata_size = sizeof(opus_default_extradata);
2020 memcpy(st->codecpar->extradata, opus_default_extradata, sizeof(opus_default_extradata));
2022 channel_config_code = get8(pp, desc_end);
2023 if (channel_config_code < 0)
2024 return AVERROR_INVALIDDATA;
2025 if (channel_config_code <= 0x8) {
2026 st->codecpar->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
2027 st->codecpar->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
2028 st->codecpar->extradata[19] = opus_stream_cnt[channel_config_code];
2029 st->codecpar->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
2030 memcpy(&st->codecpar->extradata[21], opus_channel_map[channels - 1], channels);
2032 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
2034 st->need_parsing = AVSTREAM_PARSE_FULL;
2035 st->internal->need_context_update = 1;
2038 if (ext_desc_tag == 0x06) { /* supplementary audio descriptor */
2042 return AVERROR_INVALIDDATA;
2043 flags = get8(pp, desc_end);
2045 if ((flags & 0x80) == 0) /* mix_type */
2046 st->disposition |= AV_DISPOSITION_DEPENDENT;
2048 switch ((flags >> 2) & 0x1F) { /* editorial_classification */
2050 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
2051 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2054 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
2057 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
2061 if (flags & 0x01) { /* language_code_present */
2063 return AVERROR_INVALIDDATA;
2064 language[0] = get8(pp, desc_end);
2065 language[1] = get8(pp, desc_end);
2066 language[2] = get8(pp, desc_end);
2069 /* This language always has to override a possible
2070 * ISO 639 language descriptor language */
2072 av_dict_set(&st->metadata, "language", language, 0);
2076 case 0x6a: /* ac-3_descriptor */
2078 int component_type_flag = get8(pp, desc_end) & (1 << 7);
2079 if (component_type_flag) {
2080 int component_type = get8(pp, desc_end);
2081 int service_type_mask = 0x38; // 0b00111000
2082 int service_type = ((component_type & service_type_mask) >> 3);
2083 if (service_type == 0x02 /* 0b010 */) {
2084 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2085 av_log(ts ? ts->stream : fc, AV_LOG_DEBUG, "New track disposition for id %u: %u\n", st->id, st->disposition);
2090 case 0x7a: /* enhanced_ac-3_descriptor */
2092 int component_type_flag = get8(pp, desc_end) & (1 << 7);
2093 if (component_type_flag) {
2094 int component_type = get8(pp, desc_end);
2095 int service_type_mask = 0x38; // 0b00111000
2096 int service_type = ((component_type & service_type_mask) >> 3);
2097 if (service_type == 0x02 /* 0b010 */) {
2098 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2099 av_log(ts ? ts->stream : fc, AV_LOG_DEBUG, "New track disposition for id %u: %u\n", st->id, st->disposition);
2104 case 0xfd: /* ARIB data coding type descriptor */
2105 // STD-B24, fascicle 3, chapter 4 defines private_stream_1
2107 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
2108 // This structure is defined in STD-B10, part 1, listing 5.4 and
2110 // Listing of data_component_ids is in STD-B10, part 2, Annex J.
2111 // Component tag limits are documented in TR-B14, fascicle 2,
2112 // Vol. 3, Section 2, 4.2.8.1
2113 int actual_component_tag = st->stream_identifier - 1;
2114 int picked_profile = FF_PROFILE_UNKNOWN;
2115 int data_component_id = get16(pp, desc_end);
2116 if (data_component_id < 0)
2117 return AVERROR_INVALIDDATA;
2119 switch (data_component_id) {
2121 // [0x30..0x37] are component tags utilized for
2122 // non-mobile captioning service ("profile A").
2123 if (actual_component_tag >= 0x30 &&
2124 actual_component_tag <= 0x37) {
2125 picked_profile = FF_PROFILE_ARIB_PROFILE_A;
2129 // component tag 0x87 signifies a mobile/partial reception
2130 // (1seg) captioning service ("profile C").
2131 if (actual_component_tag == 0x87) {
2132 picked_profile = FF_PROFILE_ARIB_PROFILE_C;
2139 if (picked_profile == FF_PROFILE_UNKNOWN)
2142 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2143 st->codecpar->codec_id = AV_CODEC_ID_ARIB_CAPTION;
2144 st->codecpar->profile = picked_profile;
2145 st->request_probe = 0;
2148 case 0xb0: /* DOVI video stream descriptor */
2151 AVDOVIDecoderConfigurationRecord *dovi;
2154 if (desc_end - *pp < 4) // (8 + 8 + 7 + 6 + 1 + 1 + 1) / 8
2155 return AVERROR_INVALIDDATA;
2157 dovi = av_dovi_alloc(&dovi_size);
2159 return AVERROR(ENOMEM);
2161 dovi->dv_version_major = get8(pp, desc_end);
2162 dovi->dv_version_minor = get8(pp, desc_end);
2163 buf = get16(pp, desc_end);
2164 dovi->dv_profile = (buf >> 9) & 0x7f; // 7 bits
2165 dovi->dv_level = (buf >> 3) & 0x3f; // 6 bits
2166 dovi->rpu_present_flag = (buf >> 2) & 0x01; // 1 bit
2167 dovi->el_present_flag = (buf >> 1) & 0x01; // 1 bit
2168 dovi->bl_present_flag = buf & 0x01; // 1 bit
2169 if (desc_end - *pp >= 20) { // 4 + 4 * 4
2170 buf = get8(pp, desc_end);
2171 dovi->dv_bl_signal_compatibility_id = (buf >> 4) & 0x0f; // 4 bits
2173 // 0 stands for None
2174 // Dolby Vision V1.2.93 profiles and levels
2175 dovi->dv_bl_signal_compatibility_id = 0;
2178 ret = av_stream_add_side_data(st, AV_PKT_DATA_DOVI_CONF,
2179 (uint8_t *)dovi, dovi_size);
2185 av_log(fc, AV_LOG_TRACE, "DOVI, version: %d.%d, profile: %d, level: %d, "
2186 "rpu flag: %d, el flag: %d, bl flag: %d, compatibility id: %d\n",
2187 dovi->dv_version_major, dovi->dv_version_minor,
2188 dovi->dv_profile, dovi->dv_level,
2189 dovi->rpu_present_flag,
2190 dovi->el_present_flag,
2191 dovi->bl_present_flag,
2192 dovi->dv_bl_signal_compatibility_id);
2202 static AVStream *find_matching_stream(MpegTSContext *ts, int pid, unsigned int programid,
2203 int stream_identifier, int pmt_stream_idx)
2205 AVFormatContext *s = ts->stream;
2207 AVStream *found = NULL;
2209 for (i = 0; i < s->nb_streams; i++) {
2210 AVStream *st = s->streams[i];
2211 if (st->program_num != programid)
2213 if (stream_identifier != -1) { /* match based on "stream identifier descriptor" if present */
2214 if (st->stream_identifier == stream_identifier+1) {
2218 } else if (st->pmt_stream_idx == pmt_stream_idx) { /* match based on position within the PMT */
2225 av_log(ts->stream, AV_LOG_VERBOSE,
2226 "re-using existing %s stream %d (pid=0x%x) for new pid=0x%x\n",
2227 av_get_media_type_string(found->codecpar->codec_type),
2234 static int parse_stream_identifier_desc(const uint8_t *p, const uint8_t *p_end)
2236 const uint8_t **pp = &p;
2237 const uint8_t *desc_list_end;
2238 const uint8_t *desc_end;
2240 int desc_len, desc_tag;
2242 desc_list_len = get16(pp, p_end);
2243 if (desc_list_len < 0)
2245 desc_list_len &= 0xfff;
2246 desc_list_end = p + desc_list_len;
2247 if (desc_list_end > p_end)
2251 desc_tag = get8(pp, desc_list_end);
2254 desc_len = get8(pp, desc_list_end);
2257 desc_end = *pp + desc_len;
2258 if (desc_end > desc_list_end)
2261 if (desc_tag == 0x52) {
2262 return get8(pp, desc_end);
2270 static int is_pes_stream(int stream_type, uint32_t prog_reg_desc)
2272 return !(stream_type == 0x13 ||
2273 (stream_type == 0x86 && prog_reg_desc == AV_RL32("CUEI")) );
2276 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2278 MpegTSContext *ts = filter->u.section_filter.opaque;
2279 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2280 SectionHeader h1, *h = &h1;
2283 const uint8_t *p, *p_end, *desc_list_end;
2284 int program_info_length, pcr_pid, pid, stream_type;
2286 uint32_t prog_reg_desc = 0; /* registration descriptor */
2287 int stream_identifier = -1;
2289 int mp4_descr_count = 0;
2290 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
2293 av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
2294 hex_dump_debug(ts->stream, section, section_len);
2296 p_end = section + section_len - 4;
2298 if (parse_section_header(h, &p, p_end) < 0)
2300 if (h->tid != PMT_TID)
2302 if (skip_identical(h, tssf))
2305 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d version=%d tid=%d\n",
2306 h->id, h->sec_num, h->last_sec_num, h->version, h->tid);
2308 if (!ts->scan_all_pmts && ts->skip_changes)
2311 if (ts->skip_unknown_pmt && !get_program(ts, h->id))
2313 if (!ts->skip_clear)
2314 clear_program(ts, h->id);
2316 pcr_pid = get16(&p, p_end);
2320 add_pid_to_pmt(ts, h->id, pcr_pid);
2321 update_av_program_info(ts->stream, h->id, pcr_pid, h->version);
2323 av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
2325 program_info_length = get16(&p, p_end);
2326 if (program_info_length < 0)
2328 program_info_length &= 0xfff;
2329 while (program_info_length >= 2) {
2331 tag = get8(&p, p_end);
2332 len = get8(&p, p_end);
2334 av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
2336 if (len > program_info_length - 2)
2337 // something else is broken, exit the program_descriptors_loop
2339 program_info_length -= len + 2;
2340 if (tag == 0x1d) { // IOD descriptor
2341 get8(&p, p_end); // scope
2342 get8(&p, p_end); // label
2344 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
2345 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
2346 } else if (tag == 0x05 && len >= 4) { // registration descriptor
2347 prog_reg_desc = bytestream_get_le32(&p);
2352 p += program_info_length;
2356 // stop parsing after pmt, we found header
2357 if (!ts->stream->nb_streams)
2360 set_pmt_found(ts, h->id);
2363 for (i = 0; ; i++) {
2366 stream_type = get8(&p, p_end);
2367 if (stream_type < 0)
2369 pid = get16(&p, p_end);
2373 if (pid == ts->current_pid)
2376 if (ts->merge_pmt_versions)
2377 stream_identifier = parse_stream_identifier_desc(p, p_end);
2379 /* now create stream */
2380 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
2381 pes = ts->pids[pid]->u.pes_filter.opaque;
2382 if (ts->merge_pmt_versions && !pes->st) {
2383 st = find_matching_stream(ts, pid, h->id, stream_identifier, i);
2386 pes->stream_type = stream_type;
2391 pes->st = avformat_new_stream(pes->stream, NULL);
2394 pes->st->id = pes->pid;
2395 pes->st->program_num = h->id;
2396 pes->st->pmt_version = h->version;
2397 pes->st->pmt_stream_idx = i;
2400 } else if (is_pes_stream(stream_type, prog_reg_desc)) {
2402 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
2403 pes = add_pes_stream(ts, pid, pcr_pid);
2404 if (ts->merge_pmt_versions && pes && !pes->st) {
2405 st = find_matching_stream(ts, pid, h->id, stream_identifier, i);
2408 pes->stream_type = stream_type;
2412 if (pes && !pes->st) {
2413 st = avformat_new_stream(pes->stream, NULL);
2417 st->program_num = h->id;
2418 st->pmt_version = h->version;
2419 st->pmt_stream_idx = i;
2422 int idx = ff_find_stream_index(ts->stream, pid);
2424 st = ts->stream->streams[idx];
2426 if (ts->merge_pmt_versions && !st) {
2427 st = find_matching_stream(ts, pid, h->id, stream_identifier, i);
2430 st = avformat_new_stream(ts->stream, NULL);
2434 st->program_num = h->id;
2435 st->pmt_version = h->version;
2436 st->pmt_stream_idx = i;
2437 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
2438 if (stream_type == 0x86 && prog_reg_desc == AV_RL32("CUEI")) {
2439 mpegts_find_stream_type(st, stream_type, SCTE_types);
2440 mpegts_open_section_filter(ts, pid, scte_data_cb, ts, 1);
2448 if (pes && !pes->stream_type)
2449 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
2451 add_pid_to_pmt(ts, h->id, pid);
2453 av_program_add_stream_index(ts->stream, h->id, st->index);
2455 desc_list_len = get16(&p, p_end);
2456 if (desc_list_len < 0)
2458 desc_list_len &= 0xfff;
2459 desc_list_end = p + desc_list_len;
2460 if (desc_list_end > p_end)
2463 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
2464 desc_list_end, mp4_descr,
2465 mp4_descr_count, pid, ts) < 0)
2468 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
2469 stream_type == 0x83 && pes->sub_st) {
2470 av_program_add_stream_index(ts->stream, h->id,
2471 pes->sub_st->index);
2472 pes->sub_st->codecpar->codec_tag = st->codecpar->codec_tag;
2478 if (!ts->pids[pcr_pid])
2479 mpegts_open_pcr_filter(ts, pcr_pid);
2482 for (i = 0; i < mp4_descr_count; i++)
2483 av_free(mp4_descr[i].dec_config_descr);
2486 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2488 MpegTSContext *ts = filter->u.section_filter.opaque;
2489 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2490 SectionHeader h1, *h = &h1;
2491 const uint8_t *p, *p_end;
2495 av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
2496 hex_dump_debug(ts->stream, section, section_len);
2498 p_end = section + section_len - 4;
2500 if (parse_section_header(h, &p, p_end) < 0)
2502 if (h->tid != PAT_TID)
2504 if (ts->skip_changes)
2507 if (skip_identical(h, tssf))
2509 ts->stream->ts_id = h->id;
2513 sid = get16(&p, p_end);
2516 pmt_pid = get16(&p, p_end);
2521 if (pmt_pid == ts->current_pid)
2524 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
2526 if (sid == 0x0000) {
2529 MpegTSFilter *fil = ts->pids[pmt_pid];
2530 program = av_new_program(ts->stream, sid);
2532 program->program_num = sid;
2533 program->pmt_pid = pmt_pid;
2536 if ( fil->type != MPEGTS_SECTION
2537 || fil->pid != pmt_pid
2538 || fil->u.section_filter.section_cb != pmt_cb)
2539 mpegts_close_filter(ts, ts->pids[pmt_pid]);
2541 if (!ts->pids[pmt_pid])
2542 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2543 add_pat_entry(ts, sid);
2544 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2545 add_pid_to_pmt(ts, sid, pmt_pid);
2551 for (j=0; j<ts->stream->nb_programs; j++) {
2552 for (i = 0; i < ts->nb_prg; i++)
2553 if (ts->prg[i].id == ts->stream->programs[j]->id)
2555 if (i==ts->nb_prg && !ts->skip_clear)
2556 clear_avprogram(ts, ts->stream->programs[j]->id);
2561 static void eit_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2563 MpegTSContext *ts = filter->u.section_filter.opaque;
2564 const uint8_t *p, *p_end;
2565 SectionHeader h1, *h = &h1;
2568 * Sometimes we receive EPG packets but SDT table do not have
2569 * eit_pres_following or eit_sched turned on, so we open EPG
2570 * stream directly here.
2572 if (!ts->epg_stream) {
2573 ts->epg_stream = avformat_new_stream(ts->stream, NULL);
2574 if (!ts->epg_stream)
2576 ts->epg_stream->id = EIT_PID;
2577 ts->epg_stream->codecpar->codec_type = AVMEDIA_TYPE_DATA;
2578 ts->epg_stream->codecpar->codec_id = AV_CODEC_ID_EPG;
2581 if (ts->epg_stream->discard == AVDISCARD_ALL)
2584 p_end = section + section_len - 4;
2587 if (parse_section_header(h, &p, p_end) < 0)
2589 if (h->tid < EIT_TID || h->tid > OEITS_END_TID)
2592 av_log(ts->stream, AV_LOG_TRACE, "EIT: tid received = %.02x\n", h->tid);
2595 * Service_id 0xFFFF is reserved, it indicates that the current EIT table
2598 if (h->id == 0xFFFF) {
2599 av_log(ts->stream, AV_LOG_TRACE, "Scrambled EIT table received.\n");
2604 * In case we receive an EPG packet before mpegts context is fully
2610 new_data_packet(section, section_len, ts->pkt);
2611 ts->pkt->stream_index = ts->epg_stream->index;
2615 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2617 MpegTSContext *ts = filter->u.section_filter.opaque;
2618 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2619 SectionHeader h1, *h = &h1;
2620 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2621 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2622 char *name, *provider_name;
2624 av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
2625 hex_dump_debug(ts->stream, section, section_len);
2627 p_end = section + section_len - 4;
2629 if (parse_section_header(h, &p, p_end) < 0)
2631 if (h->tid != SDT_TID)
2633 if (ts->skip_changes)
2635 if (skip_identical(h, tssf))
2638 onid = get16(&p, p_end);
2641 val = get8(&p, p_end);
2645 sid = get16(&p, p_end);
2648 val = get8(&p, p_end);
2651 desc_list_len = get16(&p, p_end);
2652 if (desc_list_len < 0)
2654 desc_list_len &= 0xfff;
2655 desc_list_end = p + desc_list_len;
2656 if (desc_list_end > p_end)
2659 desc_tag = get8(&p, desc_list_end);
2662 desc_len = get8(&p, desc_list_end);
2663 desc_end = p + desc_len;
2664 if (desc_len < 0 || desc_end > desc_list_end)
2667 av_log(ts->stream, AV_LOG_TRACE, "tag: 0x%02x len=%d\n",
2668 desc_tag, desc_len);
2672 service_type = get8(&p, p_end);
2673 if (service_type < 0)
2675 provider_name = getstr8(&p, p_end);
2678 name = getstr8(&p, p_end);
2680 AVProgram *program = av_new_program(ts->stream, sid);
2682 av_dict_set(&program->metadata, "service_name", name, 0);
2683 av_dict_set(&program->metadata, "service_provider",
2688 av_free(provider_name);
2699 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2700 const uint8_t *packet);
2702 /* handle one TS packet */
2703 static int handle_packet(MpegTSContext *ts, const uint8_t *packet, int64_t pos)
2706 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2707 has_adaptation, has_payload;
2708 const uint8_t *p, *p_end;
2710 pid = AV_RB16(packet + 1) & 0x1fff;
2711 is_start = packet[1] & 0x40;
2712 tss = ts->pids[pid];
2713 if (ts->auto_guess && !tss && is_start) {
2714 add_pes_stream(ts, pid, -1);
2715 tss = ts->pids[pid];
2720 tss->discard = discard_pid(ts, pid);
2723 ts->current_pid = pid;
2725 afc = (packet[3] >> 4) & 3;
2726 if (afc == 0) /* reserved value */
2728 has_adaptation = afc & 2;
2729 has_payload = afc & 1;
2730 is_discontinuity = has_adaptation &&
2731 packet[4] != 0 && /* with length > 0 */
2732 (packet[5] & 0x80); /* and discontinuity indicated */
2734 /* continuity check (currently not used) */
2735 cc = (packet[3] & 0xf);
2736 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2737 cc_ok = pid == 0x1FFF || // null packet PID
2744 av_log(ts->stream, AV_LOG_DEBUG,
2745 "Continuity check failed for pid %d expected %d got %d\n",
2746 pid, expected_cc, cc);
2747 if (tss->type == MPEGTS_PES) {
2748 PESContext *pc = tss->u.pes_filter.opaque;
2749 pc->flags |= AV_PKT_FLAG_CORRUPT;
2753 if (packet[1] & 0x80) {
2754 av_log(ts->stream, AV_LOG_DEBUG, "Packet had TEI flag set; marking as corrupt\n");
2755 if (tss->type == MPEGTS_PES) {
2756 PESContext *pc = tss->u.pes_filter.opaque;
2757 pc->flags |= AV_PKT_FLAG_CORRUPT;
2762 if (has_adaptation) {
2765 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2766 tss->last_pcr = pcr_h * 300 + pcr_l;
2767 /* skip adaptation field */
2770 /* if past the end of packet, ignore */
2771 p_end = packet + TS_PACKET_SIZE;
2772 if (p >= p_end || !has_payload)
2776 av_assert0(pos >= TS_PACKET_SIZE);
2777 ts->pos47_full = pos - TS_PACKET_SIZE;
2780 if (tss->type == MPEGTS_SECTION) {
2782 /* pointer field present */
2784 if (len > p_end - p)
2787 /* write remaining section bytes */
2788 write_section_data(ts, tss,
2790 /* check whether filter has been closed */
2796 write_section_data(ts, tss,
2801 write_section_data(ts, tss,
2806 // stop find_stream_info from waiting for more streams
2807 // when all programs have received a PMT
2808 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2810 for (i = 0; i < ts->nb_prg; i++) {
2811 if (!ts->prg[i].pmt_found)
2814 if (i == ts->nb_prg && ts->nb_prg > 0) {
2816 for (i = 0; i < ts->stream->nb_streams; i++) {
2817 AVStream *st = ts->stream->streams[i];
2818 if (st->codecpar->codec_type >= 0)
2819 types |= 1<<st->codecpar->codec_type;
2821 if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2822 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2823 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2830 // Note: The position here points actually behind the current packet.
2831 if (tss->type == MPEGTS_PES) {
2832 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2833 pos - ts->raw_packet_size)) < 0)
2841 static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *current_packet)
2843 MpegTSContext *ts = s->priv_data;
2844 AVIOContext *pb = s->pb;
2846 uint64_t pos = avio_tell(pb);
2847 int64_t back = FFMIN(seekback, pos);
2849 //Special case for files like 01c56b0dc1.ts
2850 if (current_packet[0] == 0x80 && current_packet[12] == 0x47) {
2851 avio_seek(pb, 12 - back, SEEK_CUR);
2855 avio_seek(pb, -back, SEEK_CUR);
2857 for (i = 0; i < ts->resync_size; i++) {
2862 int new_packet_size, ret;
2863 avio_seek(pb, -1, SEEK_CUR);
2864 pos = avio_tell(pb);
2865 ret = ffio_ensure_seekback(pb, PROBE_PACKET_MAX_BUF);
2868 new_packet_size = get_packet_size(s);
2869 if (new_packet_size > 0 && new_packet_size != ts->raw_packet_size) {
2870 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", new_packet_size);
2871 ts->raw_packet_size = new_packet_size;
2873 avio_seek(pb, pos, SEEK_SET);
2877 av_log(s, AV_LOG_ERROR,
2878 "max resync size reached, could not find sync byte\n");
2880 return AVERROR_INVALIDDATA;
2883 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2884 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2885 const uint8_t **data)
2887 AVIOContext *pb = s->pb;
2891 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2892 if (len != TS_PACKET_SIZE)
2893 return len < 0 ? len : AVERROR_EOF;
2894 /* check packet sync byte */
2895 if ((*data)[0] != 0x47) {
2896 /* find a new packet start */
2898 if (mpegts_resync(s, raw_packet_size, *data) < 0)
2899 return AVERROR(EAGAIN);
2909 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2911 AVIOContext *pb = s->pb;
2912 int skip = raw_packet_size - TS_PACKET_SIZE;
2914 avio_skip(pb, skip);
2917 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2919 AVFormatContext *s = ts->stream;
2920 uint8_t packet[TS_PACKET_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
2921 const uint8_t *data;
2925 if (avio_tell(s->pb) != ts->last_pos) {
2927 av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
2928 /* seek detected, flush pes buffer */
2929 for (i = 0; i < NB_PID_MAX; i++) {
2931 if (ts->pids[i]->type == MPEGTS_PES) {
2932 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2933 av_buffer_unref(&pes->buffer);
2934 pes->data_index = 0;
2935 pes->state = MPEGTS_SKIP; /* skip until pes header */
2936 } else if (ts->pids[i]->type == MPEGTS_SECTION) {
2937 ts->pids[i]->u.section_filter.last_ver = -1;
2939 ts->pids[i]->last_cc = -1;
2940 ts->pids[i]->last_pcr = -1;
2947 memset(packet + TS_PACKET_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
2950 if (nb_packets != 0 && packet_num >= nb_packets ||
2951 ts->stop_parse > 1) {
2952 ret = AVERROR(EAGAIN);
2955 if (ts->stop_parse > 0)
2958 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2961 ret = handle_packet(ts, data, avio_tell(s->pb));
2962 finished_reading_packet(s, ts->raw_packet_size);
2966 ts->last_pos = avio_tell(s->pb);
2970 static int mpegts_probe(const AVProbeData *p)
2972 const int size = p->buf_size;
2976 int check_count = size / TS_FEC_PACKET_SIZE;
2977 #define CHECK_COUNT 10
2978 #define CHECK_BLOCK 100
2983 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2984 int left = FFMIN(check_count - i, CHECK_BLOCK);
2985 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , 1);
2986 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, 1);
2987 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , 1);
2988 score = FFMAX3(score, dvhs_score, fec_score);
2990 maxscore = FFMAX(maxscore, score);
2993 sumscore = sumscore * CHECK_COUNT / check_count;
2994 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2996 ff_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2998 if (check_count > CHECK_COUNT && sumscore > 6) {
2999 return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
3000 } else if (check_count >= CHECK_COUNT && sumscore > 6) {
3001 return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
3002 } else if (check_count >= CHECK_COUNT && maxscore > 6) {
3003 return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
3004 } else if (sumscore > 6) {
3011 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
3012 * (-1) if not available */
3013 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
3015 int afc, len, flags;
3019 afc = (packet[3] >> 4) & 3;
3021 return AVERROR_INVALIDDATA;
3026 return AVERROR_INVALIDDATA;
3029 if (!(flags & 0x10))
3030 return AVERROR_INVALIDDATA;
3032 return AVERROR_INVALIDDATA;
3034 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
3035 *ppcr_low = ((p[4] & 1) << 8) | p[5];
3039 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
3041 /* NOTE: We attempt to seek on non-seekable files as well, as the
3042 * probe buffer usually is big enough. Only warn if the seek failed
3043 * on files where the seek should work. */
3044 if (avio_seek(pb, pos, SEEK_SET) < 0)
3045 av_log(s, (pb->seekable & AVIO_SEEKABLE_NORMAL) ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
3048 static int mpegts_read_header(AVFormatContext *s)
3050 MpegTSContext *ts = s->priv_data;
3051 AVIOContext *pb = s->pb;
3052 int64_t pos, probesize = s->probesize;
3054 s->internal->prefer_codec_framerate = 1;
3056 if (ffio_ensure_seekback(pb, probesize) < 0)
3057 av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
3059 pos = avio_tell(pb);
3060 ts->raw_packet_size = get_packet_size(s);
3061 if (ts->raw_packet_size <= 0) {
3062 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
3063 ts->raw_packet_size = TS_PACKET_SIZE;
3068 if (s->iformat == &ff_mpegts_demuxer) {
3071 /* first do a scan to get all the services */
3072 seek_back(s, pb, pos);
3074 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
3075 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
3076 mpegts_open_section_filter(ts, EIT_PID, eit_cb, ts, 1);
3078 handle_packets(ts, probesize / ts->raw_packet_size);
3079 /* if could not find service, enable auto_guess */
3083 av_log(ts->stream, AV_LOG_TRACE, "tuning done\n");
3085 s->ctx_flags |= AVFMTCTX_NOHEADER;
3088 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
3089 int64_t pcrs[2], pcr_h;
3090 int packet_count[2];
3091 uint8_t packet[TS_PACKET_SIZE];
3092 const uint8_t *data;
3094 /* only read packets */
3096 st = avformat_new_stream(s, NULL);
3098 return AVERROR(ENOMEM);
3099 avpriv_set_pts_info(st, 60, 1, 27000000);
3100 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
3101 st->codecpar->codec_id = AV_CODEC_ID_MPEG2TS;
3103 /* we iterate until we find two PCRs to estimate the bitrate */
3108 ret = read_packet(s, packet, ts->raw_packet_size, &data);
3111 pid = AV_RB16(data + 1) & 0x1fff;
3112 if ((pcr_pid == -1 || pcr_pid == pid) &&
3113 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
3114 finished_reading_packet(s, ts->raw_packet_size);
3116 packet_count[nb_pcrs] = nb_packets;
3117 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
3120 if (pcrs[1] - pcrs[0] > 0) {
3121 /* the difference needs to be positive to make sense for bitrate computation */
3124 av_log(ts->stream, AV_LOG_WARNING, "invalid pcr pair %"PRId64" >= %"PRId64"\n", pcrs[0], pcrs[1]);
3126 packet_count[0] = packet_count[1];
3131 finished_reading_packet(s, ts->raw_packet_size);
3136 /* NOTE1: the bitrate is computed without the FEC */
3137 /* NOTE2: it is only the bitrate of the start of the stream */
3138 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
3139 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
3140 s->bit_rate = TS_PACKET_SIZE * 8 * 27000000LL / ts->pcr_incr;
3141 st->codecpar->bit_rate = s->bit_rate;
3142 st->start_time = ts->cur_pcr;
3143 av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%d\n",
3144 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
3147 seek_back(s, pb, pos);
3151 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
3153 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
3155 MpegTSContext *ts = s->priv_data;
3157 int64_t pcr_h, next_pcr_h, pos;
3158 int pcr_l, next_pcr_l;
3159 uint8_t pcr_buf[12];
3160 const uint8_t *data;
3162 if ((ret = av_new_packet(pkt, TS_PACKET_SIZE)) < 0)
3164 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
3165 pkt->pos = avio_tell(s->pb);
3169 if (data != pkt->data)
3170 memcpy(pkt->data, data, ts->raw_packet_size);
3171 finished_reading_packet(s, ts->raw_packet_size);
3172 if (ts->mpeg2ts_compute_pcr) {
3173 /* compute exact PCR for each packet */
3174 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
3175 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
3176 pos = avio_tell(s->pb);
3177 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
3178 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
3179 avio_read(s->pb, pcr_buf, 12);
3180 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
3181 /* XXX: not precise enough */
3183 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
3188 avio_seek(s->pb, pos, SEEK_SET);
3189 /* no next PCR found: we use previous increment */
3190 ts->cur_pcr = pcr_h * 300 + pcr_l;
3192 pkt->pts = ts->cur_pcr;
3193 pkt->duration = ts->pcr_incr;
3194 ts->cur_pcr += ts->pcr_incr;
3196 pkt->stream_index = 0;
3200 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
3202 MpegTSContext *ts = s->priv_data;
3207 ret = handle_packets(ts, 0);
3209 av_packet_unref(ts->pkt);
3210 /* flush pes data left */
3211 for (i = 0; i < NB_PID_MAX; i++)
3212 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
3213 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
3214 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
3215 ret = new_pes_packet(pes, pkt);
3218 pes->state = MPEGTS_SKIP;
3225 if (!ret && pkt->size < 0)
3226 ret = AVERROR_INVALIDDATA;
3230 static void mpegts_free(MpegTSContext *ts)
3236 for (i = 0; i < FF_ARRAY_ELEMS(ts->pools); i++)
3237 av_buffer_pool_uninit(&ts->pools[i]);
3239 for (i = 0; i < NB_PID_MAX; i++)
3241 mpegts_close_filter(ts, ts->pids[i]);
3244 static int mpegts_read_close(AVFormatContext *s)
3246 MpegTSContext *ts = s->priv_data;
3251 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
3252 int64_t *ppos, int64_t pos_limit)
3254 MpegTSContext *ts = s->priv_data;
3255 int64_t pos, timestamp;
3256 uint8_t buf[TS_PACKET_SIZE];
3257 int pcr_l, pcr_pid =
3258 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
3259 int pos47 = ts->pos47_full % ts->raw_packet_size;
3261 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
3262 ts->raw_packet_size + pos47;
3263 while(pos < pos_limit) {
3264 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
3265 return AV_NOPTS_VALUE;
3266 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
3267 return AV_NOPTS_VALUE;
3268 if (buf[0] != 0x47) {
3269 if (mpegts_resync(s, TS_PACKET_SIZE, buf) < 0)
3270 return AV_NOPTS_VALUE;
3271 pos = avio_tell(s->pb);
3274 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
3275 parse_pcr(×tamp, &pcr_l, buf) == 0) {
3279 pos += ts->raw_packet_size;
3282 return AV_NOPTS_VALUE;
3285 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
3286 int64_t *ppos, int64_t pos_limit)
3288 MpegTSContext *ts = s->priv_data;
3290 int pos47 = ts->pos47_full % ts->raw_packet_size;
3291 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
3292 ff_read_frame_flush(s);
3293 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
3294 return AV_NOPTS_VALUE;
3295 while(pos < pos_limit) {
3298 av_init_packet(&pkt);
3299 ret = av_read_frame(s, &pkt);
3301 return AV_NOPTS_VALUE;
3302 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
3303 ff_reduce_index(s, pkt.stream_index);
3304 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
3305 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
3306 int64_t dts = pkt.dts;
3308 av_packet_unref(&pkt);
3313 av_packet_unref(&pkt);
3316 return AV_NOPTS_VALUE;
3319 /**************************************************************/
3320 /* parsing functions - called from other demuxers such as RTP */
3322 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
3326 ts = av_mallocz(sizeof(MpegTSContext));
3329 /* no stream case, currently used by RTP */
3330 ts->raw_packet_size = TS_PACKET_SIZE;
3334 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
3335 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
3336 mpegts_open_section_filter(ts, EIT_PID, eit_cb, ts, 1);
3341 /* return the consumed length if a packet was output, or -1 if no
3342 * packet is output */
3343 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
3344 const uint8_t *buf, int len)
3352 if (len < TS_PACKET_SIZE)
3353 return AVERROR_INVALIDDATA;
3354 if (buf[0] != 0x47) {
3358 handle_packet(ts, buf, len1 - len + TS_PACKET_SIZE);
3359 buf += TS_PACKET_SIZE;
3360 len -= TS_PACKET_SIZE;
3361 if (ts->stop_parse == 1)
3368 void avpriv_mpegts_parse_close(MpegTSContext *ts)
3374 AVInputFormat ff_mpegts_demuxer = {
3376 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
3377 .priv_data_size = sizeof(MpegTSContext),
3378 .read_probe = mpegts_probe,
3379 .read_header = mpegts_read_header,
3380 .read_packet = mpegts_read_packet,
3381 .read_close = mpegts_read_close,
3382 .read_timestamp = mpegts_get_dts,
3383 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
3384 .priv_class = &mpegts_class,
3387 AVInputFormat ff_mpegtsraw_demuxer = {
3388 .name = "mpegtsraw",
3389 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
3390 .priv_data_size = sizeof(MpegTSContext),
3391 .read_header = mpegts_read_header,
3392 .read_packet = mpegts_raw_read_packet,
3393 .read_close = mpegts_read_close,
3394 .read_timestamp = mpegts_get_dts,
3395 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
3396 .priv_class = &mpegtsraw_class,