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;
514 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
516 sec = &filter->u.section_filter;
517 sec->section_cb = section_cb;
518 sec->opaque = opaque;
519 sec->section_buf = av_mallocz(MAX_SECTION_SIZE);
520 sec->check_crc = check_crc;
523 if (!sec->section_buf) {
530 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
534 MpegTSFilter *filter;
535 MpegTSPESFilter *pes;
537 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
540 pes = &filter->u.pes_filter;
541 pes->pes_cb = pes_cb;
542 pes->opaque = opaque;
546 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
548 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
551 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
556 if (filter->type == MPEGTS_SECTION)
557 av_freep(&filter->u.section_filter.section_buf);
558 else if (filter->type == MPEGTS_PES) {
559 PESContext *pes = filter->u.pes_filter.opaque;
560 av_buffer_unref(&pes->buffer);
561 /* referenced private data will be freed later in
562 * avformat_close_input (pes->st->priv_data == pes) */
563 if (!pes->st || pes->merged_st) {
564 av_freep(&filter->u.pes_filter.opaque);
569 ts->pids[pid] = NULL;
572 static int analyze(const uint8_t *buf, int size, int packet_size,
575 int stat[TS_MAX_PACKET_SIZE];
580 memset(stat, 0, packet_size * sizeof(*stat));
582 for (i = 0; i < size - 3; i++) {
583 if (buf[i] == 0x47) {
584 int pid = AV_RB16(buf+1) & 0x1FFF;
585 int asc = buf[i + 3] & 0x30;
586 if (!probe || pid == 0x1FFF || asc) {
587 int x = i % packet_size;
590 if (stat[x] > best_score) {
591 best_score = stat[x];
597 return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
600 /* autodetect fec presence */
601 static int get_packet_size(AVFormatContext* s)
603 int score, fec_score, dvhs_score;
607 /*init buffer to store stream for probing */
608 uint8_t buf[PROBE_PACKET_MAX_BUF] = {0};
611 while (buf_size < PROBE_PACKET_MAX_BUF) {
612 ret = avio_read_partial(s->pb, buf + buf_size, PROBE_PACKET_MAX_BUF - buf_size);
614 return AVERROR_INVALIDDATA;
617 score = analyze(buf, buf_size, TS_PACKET_SIZE, 0);
618 dvhs_score = analyze(buf, buf_size, TS_DVHS_PACKET_SIZE, 0);
619 fec_score = analyze(buf, buf_size, TS_FEC_PACKET_SIZE, 0);
620 av_log(s, AV_LOG_TRACE, "Probe: %d, score: %d, dvhs_score: %d, fec_score: %d \n",
621 buf_size, score, dvhs_score, fec_score);
623 margin = mid_pred(score, fec_score, dvhs_score);
625 if (buf_size < PROBE_PACKET_MAX_BUF)
626 margin += PROBE_PACKET_MARGIN; /*if buffer not filled */
629 return TS_PACKET_SIZE;
630 else if (dvhs_score > margin)
631 return TS_DVHS_PACKET_SIZE;
632 else if (fec_score > margin)
633 return TS_FEC_PACKET_SIZE;
635 return AVERROR_INVALIDDATA;
638 typedef struct SectionHeader {
643 uint8_t last_sec_num;
646 static int skip_identical(const SectionHeader *h, MpegTSSectionFilter *tssf)
648 if (h->version == tssf->last_ver && tssf->last_crc == tssf->crc)
651 tssf->last_ver = h->version;
652 tssf->last_crc = tssf->crc;
657 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
664 return AVERROR_INVALIDDATA;
670 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
677 return AVERROR_INVALIDDATA;
684 /* read and allocate a DVB string preceded by its length */
685 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
692 len = get8(&p, p_end);
699 const char *encodings[] = {
700 "ISO6937", "ISO-8859-5", "ISO-8859-6", "ISO-8859-7",
701 "ISO-8859-8", "ISO-8859-9", "ISO-8859-10", "ISO-8859-11",
702 "", "ISO-8859-13", "ISO-8859-14", "ISO-8859-15", "", "", "", "",
703 "", "UCS-2BE", "KSC_5601", "GB2312", "UCS-2BE", "UTF-8", "", "",
704 "", "", "", "", "", "", "", ""
708 size_t inlen = len, outlen = inlen * 6 + 1;
709 if (len >= 3 && p[0] == 0x10 && !p[1] && p[2] && p[2] <= 0xf && p[2] != 0xc) {
711 snprintf(iso8859, sizeof(iso8859), "ISO-8859-%d", p[2]);
714 cd = iconv_open("UTF-8", iso8859);
715 } else if (p[0] < 0x20) {
718 cd = iconv_open("UTF-8", encodings[*p]);
721 cd = iconv_open("UTF-8", encodings[0]);
723 if (cd == (iconv_t)-1)
725 str = out = av_malloc(outlen);
730 if (iconv(cd, &in, &inlen, &out, &outlen) == -1) {
742 str = av_malloc(len + 1);
752 static int parse_section_header(SectionHeader *h,
753 const uint8_t **pp, const uint8_t *p_end)
757 val = get8(pp, p_end);
762 val = get16(pp, p_end);
766 val = get8(pp, p_end);
769 h->version = (val >> 1) & 0x1f;
770 val = get8(pp, p_end);
774 val = get8(pp, p_end);
777 h->last_sec_num = val;
781 typedef struct StreamType {
782 uint32_t stream_type;
783 enum AVMediaType codec_type;
784 enum AVCodecID codec_id;
787 static const StreamType ISO_types[] = {
788 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
789 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
790 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
791 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
792 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
793 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
794 /* Makito encoder sets stream type 0x11 for AAC,
795 * so auto-detect LOAS/LATM instead of hardcoding it. */
796 #if !CONFIG_LOAS_DEMUXER
797 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
799 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
800 { 0x1c, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
801 { 0x20, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
802 { 0x21, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_JPEG2000 },
803 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
804 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
805 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
806 { 0xd2, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_AVS2 },
807 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
811 static const StreamType HDMV_types[] = {
812 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
813 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
814 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
815 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
816 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
817 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
818 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
819 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
820 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
821 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
822 { 0x92, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_TEXT_SUBTITLE },
827 static const StreamType SCTE_types[] = {
828 { 0x86, AVMEDIA_TYPE_DATA, AV_CODEC_ID_SCTE_35 },
833 static const StreamType MISC_types[] = {
834 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
835 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
839 static const StreamType REGD_types[] = {
840 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
841 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
842 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
843 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
844 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
845 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
846 { MKTAG('E', 'A', 'C', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
847 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
848 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
849 { MKTAG('I', 'D', '3', ' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
850 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
851 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
855 static const StreamType METADATA_types[] = {
856 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
857 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
861 /* descriptor present */
862 static const StreamType DESC_types[] = {
863 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
864 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
865 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
866 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
867 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
871 static void mpegts_find_stream_type(AVStream *st,
872 uint32_t stream_type,
873 const StreamType *types)
875 for (; types->stream_type; types++)
876 if (stream_type == types->stream_type) {
877 if (st->codecpar->codec_type != types->codec_type ||
878 st->codecpar->codec_id != types->codec_id) {
879 st->codecpar->codec_type = types->codec_type;
880 st->codecpar->codec_id = types->codec_id;
881 st->internal->need_context_update = 1;
883 st->request_probe = 0;
888 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
889 uint32_t stream_type, uint32_t prog_reg_desc)
891 int old_codec_type = st->codecpar->codec_type;
892 int old_codec_id = st->codecpar->codec_id;
893 int old_codec_tag = st->codecpar->codec_tag;
895 if (avcodec_is_open(st->internal->avctx)) {
896 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, internal codec is open\n");
900 avpriv_set_pts_info(st, 33, 1, 90000);
902 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
903 st->codecpar->codec_id = AV_CODEC_ID_NONE;
904 st->need_parsing = AVSTREAM_PARSE_FULL;
906 pes->stream_type = stream_type;
908 av_log(pes->stream, AV_LOG_DEBUG,
909 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
910 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
912 st->codecpar->codec_tag = pes->stream_type;
914 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
915 if (pes->stream_type == 4 || pes->stream_type == 0x0f)
916 st->request_probe = 50;
917 if ((prog_reg_desc == AV_RL32("HDMV") ||
918 prog_reg_desc == AV_RL32("HDPR")) &&
919 st->codecpar->codec_id == AV_CODEC_ID_NONE) {
920 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
921 if (pes->stream_type == 0x83) {
922 // HDMV TrueHD streams also contain an AC3 coded version of the
923 // audio track - add a second stream for this
925 // priv_data cannot be shared between streams
926 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
928 return AVERROR(ENOMEM);
929 memcpy(sub_pes, pes, sizeof(*sub_pes));
931 sub_st = avformat_new_stream(pes->stream, NULL);
934 return AVERROR(ENOMEM);
937 sub_st->id = pes->pid;
938 avpriv_set_pts_info(sub_st, 33, 1, 90000);
939 sub_st->priv_data = sub_pes;
940 sub_st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
941 sub_st->codecpar->codec_id = AV_CODEC_ID_AC3;
942 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
943 sub_pes->sub_st = pes->sub_st = sub_st;
946 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
947 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
948 if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
949 st->codecpar->codec_id = old_codec_id;
950 st->codecpar->codec_type = old_codec_type;
952 if ((st->codecpar->codec_id == AV_CODEC_ID_NONE ||
953 (st->request_probe > 0 && st->request_probe < AVPROBE_SCORE_STREAM_RETRY / 5)) &&
954 st->probe_packets > 0 &&
955 stream_type == STREAM_TYPE_PRIVATE_DATA) {
956 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
957 st->codecpar->codec_id = AV_CODEC_ID_BIN_DATA;
958 st->request_probe = AVPROBE_SCORE_STREAM_RETRY / 5;
961 /* queue a context update if properties changed */
962 if (old_codec_type != st->codecpar->codec_type ||
963 old_codec_id != st->codecpar->codec_id ||
964 old_codec_tag != st->codecpar->codec_tag)
965 st->internal->need_context_update = 1;
970 static void reset_pes_packet_state(PESContext *pes)
972 pes->pts = AV_NOPTS_VALUE;
973 pes->dts = AV_NOPTS_VALUE;
976 av_buffer_unref(&pes->buffer);
979 static void new_data_packet(const uint8_t *buffer, int len, AVPacket *pkt)
982 pkt->data = (uint8_t *)buffer;
986 static int new_pes_packet(PESContext *pes, AVPacket *pkt)
992 pkt->buf = pes->buffer;
993 pkt->data = pes->buffer->data;
994 pkt->size = pes->data_index;
996 if (pes->total_size != MAX_PES_PAYLOAD &&
997 pes->pes_header_size + pes->data_index != pes->total_size +
999 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
1000 pes->flags |= AV_PKT_FLAG_CORRUPT;
1002 memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1004 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
1005 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
1006 pkt->stream_index = pes->sub_st->index;
1008 pkt->stream_index = pes->st->index;
1009 pkt->pts = pes->pts;
1010 pkt->dts = pes->dts;
1011 /* store position of first TS packet of this PES packet */
1012 pkt->pos = pes->ts_packet_pos;
1013 pkt->flags = pes->flags;
1016 reset_pes_packet_state(pes);
1018 sd = av_packet_new_side_data(pkt, AV_PKT_DATA_MPEGTS_STREAM_ID, 1);
1020 return AVERROR(ENOMEM);
1021 *sd = pes->stream_id;
1026 static uint64_t get_ts64(GetBitContext *gb, int bits)
1028 if (get_bits_left(gb) < bits)
1029 return AV_NOPTS_VALUE;
1030 return get_bits64(gb, bits);
1033 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
1034 const uint8_t *buf, int buf_size)
1037 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
1038 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
1039 int dts_flag = -1, cts_flag = -1;
1040 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
1041 uint8_t buf_padded[128 + AV_INPUT_BUFFER_PADDING_SIZE];
1042 int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - AV_INPUT_BUFFER_PADDING_SIZE);
1044 memcpy(buf_padded, buf, buf_padded_size);
1046 init_get_bits(&gb, buf_padded, buf_padded_size * 8);
1048 if (sl->use_au_start)
1049 au_start_flag = get_bits1(&gb);
1051 au_end_flag = get_bits1(&gb);
1052 if (!sl->use_au_start && !sl->use_au_end)
1053 au_start_flag = au_end_flag = 1;
1054 if (sl->ocr_len > 0)
1055 ocr_flag = get_bits1(&gb);
1057 idle_flag = get_bits1(&gb);
1058 if (sl->use_padding)
1059 padding_flag = get_bits1(&gb);
1061 padding_bits = get_bits(&gb, 3);
1063 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
1064 if (sl->packet_seq_num_len)
1065 skip_bits_long(&gb, sl->packet_seq_num_len);
1066 if (sl->degr_prior_len)
1068 skip_bits(&gb, sl->degr_prior_len);
1070 skip_bits_long(&gb, sl->ocr_len);
1071 if (au_start_flag) {
1072 if (sl->use_rand_acc_pt)
1074 if (sl->au_seq_num_len > 0)
1075 skip_bits_long(&gb, sl->au_seq_num_len);
1076 if (sl->use_timestamps) {
1077 dts_flag = get_bits1(&gb);
1078 cts_flag = get_bits1(&gb);
1081 if (sl->inst_bitrate_len)
1082 inst_bitrate_flag = get_bits1(&gb);
1084 dts = get_ts64(&gb, sl->timestamp_len);
1086 cts = get_ts64(&gb, sl->timestamp_len);
1088 skip_bits_long(&gb, sl->au_len);
1089 if (inst_bitrate_flag)
1090 skip_bits_long(&gb, sl->inst_bitrate_len);
1093 if (dts != AV_NOPTS_VALUE)
1095 if (cts != AV_NOPTS_VALUE)
1098 if (sl->timestamp_len && sl->timestamp_res)
1099 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
1101 return (get_bits_count(&gb) + 7) >> 3;
1104 static AVBufferRef *buffer_pool_get(MpegTSContext *ts, int size)
1106 int index = av_log2(size + AV_INPUT_BUFFER_PADDING_SIZE);
1107 if (!ts->pools[index]) {
1108 int pool_size = FFMIN(MAX_PES_PAYLOAD + AV_INPUT_BUFFER_PADDING_SIZE, 2 << index);
1109 ts->pools[index] = av_buffer_pool_init(pool_size, NULL);
1110 if (!ts->pools[index])
1113 return av_buffer_pool_get(ts->pools[index]);
1116 /* return non zero if a packet could be constructed */
1117 static int mpegts_push_data(MpegTSFilter *filter,
1118 const uint8_t *buf, int buf_size, int is_start,
1121 PESContext *pes = filter->u.pes_filter.opaque;
1122 MpegTSContext *ts = pes->ts;
1130 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1131 ret = new_pes_packet(pes, ts->pkt);
1136 reset_pes_packet_state(pes);
1138 pes->state = MPEGTS_HEADER;
1139 pes->ts_packet_pos = pos;
1142 while (buf_size > 0) {
1143 switch (pes->state) {
1145 len = PES_START_SIZE - pes->data_index;
1148 memcpy(pes->header + pes->data_index, p, len);
1149 pes->data_index += len;
1152 if (pes->data_index == PES_START_SIZE) {
1153 /* we got all the PES or section header. We can now
1155 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
1156 pes->header[2] == 0x01) {
1157 /* it must be an MPEG-2 PES stream */
1158 code = pes->header[3] | 0x100;
1159 av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
1161 pes->stream_id = pes->header[3];
1163 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
1165 pes->sub_st->discard == AVDISCARD_ALL)) ||
1166 code == 0x1be) /* padding_stream */
1169 /* stream not present in PMT */
1171 if (ts->skip_changes)
1173 if (ts->merge_pmt_versions)
1174 goto skip; /* wait for PMT to merge new stream */
1176 pes->st = avformat_new_stream(ts->stream, NULL);
1178 return AVERROR(ENOMEM);
1179 pes->st->id = pes->pid;
1180 mpegts_set_stream_info(pes->st, pes, 0, 0);
1183 pes->total_size = AV_RB16(pes->header + 4);
1184 /* NOTE: a zero total size means the PES size is
1186 if (!pes->total_size)
1187 pes->total_size = MAX_PES_PAYLOAD;
1189 /* allocate pes buffer */
1190 pes->buffer = buffer_pool_get(ts, pes->total_size);
1192 return AVERROR(ENOMEM);
1194 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1195 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1196 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1197 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1198 pes->state = MPEGTS_PESHEADER;
1199 if (pes->st->codecpar->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1200 av_log(pes->stream, AV_LOG_TRACE,
1201 "pid=%x stream_type=%x probing\n",
1204 pes->st->request_probe = 1;
1207 pes->pes_header_size = 6;
1208 pes->state = MPEGTS_PAYLOAD;
1209 pes->data_index = 0;
1212 /* otherwise, it should be a table */
1215 pes->state = MPEGTS_SKIP;
1220 /**********************************************/
1221 /* PES packing parsing */
1222 case MPEGTS_PESHEADER:
1223 len = PES_HEADER_SIZE - pes->data_index;
1225 return AVERROR_INVALIDDATA;
1228 memcpy(pes->header + pes->data_index, p, len);
1229 pes->data_index += len;
1232 if (pes->data_index == PES_HEADER_SIZE) {
1233 pes->pes_header_size = pes->header[8] + 9;
1234 pes->state = MPEGTS_PESHEADER_FILL;
1237 case MPEGTS_PESHEADER_FILL:
1238 len = pes->pes_header_size - pes->data_index;
1240 return AVERROR_INVALIDDATA;
1243 memcpy(pes->header + pes->data_index, p, len);
1244 pes->data_index += len;
1247 if (pes->data_index == pes->pes_header_size) {
1249 unsigned int flags, pes_ext, skip;
1251 flags = pes->header[7];
1252 r = pes->header + 9;
1253 pes->pts = AV_NOPTS_VALUE;
1254 pes->dts = AV_NOPTS_VALUE;
1255 if ((flags & 0xc0) == 0x80) {
1256 pes->dts = pes->pts = ff_parse_pes_pts(r);
1258 } else if ((flags & 0xc0) == 0xc0) {
1259 pes->pts = ff_parse_pes_pts(r);
1261 pes->dts = ff_parse_pes_pts(r);
1264 pes->extended_stream_id = -1;
1265 if (flags & 0x01) { /* PES extension */
1267 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1268 skip = (pes_ext >> 4) & 0xb;
1271 if ((pes_ext & 0x41) == 0x01 &&
1272 (r + 2) <= (pes->header + pes->pes_header_size)) {
1273 /* PES extension 2 */
1274 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1275 pes->extended_stream_id = r[1];
1279 /* we got the full header. We parse it and get the payload */
1280 pes->state = MPEGTS_PAYLOAD;
1281 pes->data_index = 0;
1282 if (pes->stream_type == 0x12 && buf_size > 0) {
1283 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1285 pes->pes_header_size += sl_header_bytes;
1286 p += sl_header_bytes;
1287 buf_size -= sl_header_bytes;
1289 if (pes->stream_type == 0x15 && buf_size >= 5) {
1290 /* skip metadata access unit header */
1291 pes->pes_header_size += 5;
1295 if ( pes->ts->fix_teletext_pts
1296 && ( pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT
1297 || pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
1299 AVProgram *p = NULL;
1301 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1302 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1303 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1305 AVStream *st = NULL;
1306 if (f->type == MPEGTS_PES) {
1307 PESContext *pcrpes = f->u.pes_filter.opaque;
1310 } else if (f->type == MPEGTS_PCR) {
1312 for (i = 0; i < p->nb_stream_indexes; i++) {
1313 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1314 if (pst->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
1318 if (f->last_pcr != -1 && !f->discard) {
1319 // teletext packets do not always have correct timestamps,
1320 // the standard says they should be handled after 40.6 ms at most,
1321 // and the pcr error to this packet should be no more than 100 ms.
1322 // TODO: we should interpolate the PCR, not just use the last one
1323 int64_t pcr = f->last_pcr / 300;
1326 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1327 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1329 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1330 pes->pts = pes->dts = pcr;
1331 } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT &&
1332 pes->dts > pcr + 3654 + 9000) {
1333 pes->pts = pes->dts = pcr + 3654 + 9000;
1334 } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE &&
1335 pes->dts > pcr + 10*90000) { //10sec
1336 pes->pts = pes->dts = pcr + 3654 + 9000;
1345 av_log(pes->stream, AV_LOG_VERBOSE,
1346 "Forcing DTS/PTS to be unset for a "
1347 "non-trustworthy PES packet for PID %d as "
1348 "PCR hasn't been received yet.\n",
1350 pes->dts = pes->pts = AV_NOPTS_VALUE;
1355 case MPEGTS_PAYLOAD:
1357 if (pes->data_index > 0 &&
1358 pes->data_index + buf_size > pes->total_size) {
1359 ret = new_pes_packet(pes, ts->pkt);
1362 pes->total_size = MAX_PES_PAYLOAD;
1363 pes->buffer = buffer_pool_get(ts, pes->total_size);
1365 return AVERROR(ENOMEM);
1367 } else if (pes->data_index == 0 &&
1368 buf_size > pes->total_size) {
1369 // pes packet size is < ts size packet and pes data is padded with 0xff
1370 // not sure if this is legal in ts but see issue #2392
1371 buf_size = pes->total_size;
1373 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1374 pes->data_index += buf_size;
1375 /* emit complete packets with known packet size
1376 * decreases demuxer delay for infrequent packets like subtitles from
1377 * a couple of seconds to milliseconds for properly muxed files.
1378 * total_size is the number of bytes following pes_packet_length
1379 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1380 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1381 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1383 ret = new_pes_packet(pes, ts->pkt);
1399 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1404 /* if no pid found, then add a pid context */
1405 pes = av_mallocz(sizeof(PESContext));
1409 pes->stream = ts->stream;
1411 pes->pcr_pid = pcr_pid;
1412 pes->state = MPEGTS_SKIP;
1413 pes->pts = AV_NOPTS_VALUE;
1414 pes->dts = AV_NOPTS_VALUE;
1415 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1424 typedef struct MP4DescrParseContext {
1428 Mp4Descr *active_descr;
1430 int max_descr_count;
1432 int predefined_SLConfigDescriptor_seen;
1433 } MP4DescrParseContext;
1435 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1436 const uint8_t *buf, unsigned size,
1437 Mp4Descr *descr, int max_descr_count)
1440 if (size > (1 << 30))
1441 return AVERROR_INVALIDDATA;
1443 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1444 NULL, NULL, NULL, NULL)) < 0)
1451 d->active_descr = NULL;
1452 d->max_descr_count = max_descr_count;
1457 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1459 int64_t new_off = avio_tell(pb);
1460 (*len) -= new_off - *off;
1464 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1467 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1470 int ret = parse_mp4_descr(d, off, len, 0);
1473 update_offsets(&d->pb, &off, &len);
1478 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1480 avio_rb16(&d->pb); // ID
1486 update_offsets(&d->pb, &off, &len);
1487 return parse_mp4_descr_arr(d, off, len);
1490 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1495 id_flags = avio_rb16(&d->pb);
1496 if (!(id_flags & 0x0020)) { // URL_Flag
1497 update_offsets(&d->pb, &off, &len);
1498 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1504 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1509 if (d->descr_count >= d->max_descr_count)
1510 return AVERROR_INVALIDDATA;
1511 ff_mp4_parse_es_descr(&d->pb, &es_id);
1512 d->active_descr = d->descr + (d->descr_count++);
1514 d->active_descr->es_id = es_id;
1515 update_offsets(&d->pb, &off, &len);
1516 if ((ret = parse_mp4_descr(d, off, len, MP4DecConfigDescrTag)) < 0)
1518 update_offsets(&d->pb, &off, &len);
1520 ret = parse_mp4_descr(d, off, len, MP4SLDescrTag);
1521 d->active_descr = NULL;
1525 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1528 Mp4Descr *descr = d->active_descr;
1530 return AVERROR_INVALIDDATA;
1531 d->active_descr->dec_config_descr = av_malloc(len);
1532 if (!descr->dec_config_descr)
1533 return AVERROR(ENOMEM);
1534 descr->dec_config_descr_len = len;
1535 avio_read(&d->pb, descr->dec_config_descr, len);
1539 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1541 Mp4Descr *descr = d->active_descr;
1544 return AVERROR_INVALIDDATA;
1546 #define R8_CHECK_CLIP_MAX(dst, maxv) do { \
1547 descr->sl.dst = avio_r8(&d->pb); \
1548 if (descr->sl.dst > maxv) { \
1549 descr->sl.dst = maxv; \
1550 return AVERROR_INVALIDDATA; \
1554 predefined = avio_r8(&d->pb);
1557 int flags = avio_r8(&d->pb);
1558 descr->sl.use_au_start = !!(flags & 0x80);
1559 descr->sl.use_au_end = !!(flags & 0x40);
1560 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1561 descr->sl.use_padding = !!(flags & 0x08);
1562 descr->sl.use_timestamps = !!(flags & 0x04);
1563 descr->sl.use_idle = !!(flags & 0x02);
1564 descr->sl.timestamp_res = avio_rb32(&d->pb);
1566 R8_CHECK_CLIP_MAX(timestamp_len, 63);
1567 R8_CHECK_CLIP_MAX(ocr_len, 63);
1568 R8_CHECK_CLIP_MAX(au_len, 31);
1569 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1570 lengths = avio_rb16(&d->pb);
1571 descr->sl.degr_prior_len = lengths >> 12;
1572 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1573 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1574 } else if (!d->predefined_SLConfigDescriptor_seen){
1575 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1576 d->predefined_SLConfigDescriptor_seen = 1;
1581 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1585 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1588 update_offsets(&d->pb, &off, &len);
1589 if (len < 0 || len1 > len || len1 <= 0) {
1590 av_log(d->s, AV_LOG_ERROR,
1591 "Tag %x length violation new length %d bytes remaining %d\n",
1593 return AVERROR_INVALIDDATA;
1596 if (d->level++ >= MAX_LEVEL) {
1597 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1598 ret = AVERROR_INVALIDDATA;
1602 if (target_tag && tag != target_tag) {
1603 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1605 ret = AVERROR_INVALIDDATA;
1611 ret = parse_MP4IODescrTag(d, off, len1);
1614 ret = parse_MP4ODescrTag(d, off, len1);
1617 ret = parse_MP4ESDescrTag(d, off, len1);
1619 case MP4DecConfigDescrTag:
1620 ret = parse_MP4DecConfigDescrTag(d, off, len1);
1623 ret = parse_MP4SLDescrTag(d, off, len1);
1630 avio_seek(&d->pb, off + len1, SEEK_SET);
1634 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1635 Mp4Descr *descr, int *descr_count, int max_descr_count)
1637 MP4DescrParseContext d;
1640 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1644 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1646 *descr_count = d.descr_count;
1650 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1651 Mp4Descr *descr, int *descr_count, int max_descr_count)
1653 MP4DescrParseContext d;
1656 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1660 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1662 *descr_count = d.descr_count;
1666 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1669 MpegTSContext *ts = filter->u.section_filter.opaque;
1670 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1672 const uint8_t *p, *p_end;
1674 int mp4_descr_count = 0;
1675 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1677 AVFormatContext *s = ts->stream;
1679 p_end = section + section_len - 4;
1681 if (parse_section_header(&h, &p, p_end) < 0)
1683 if (h.tid != M4OD_TID)
1685 if (skip_identical(&h, tssf))
1688 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1689 MAX_MP4_DESCR_COUNT);
1691 for (pid = 0; pid < NB_PID_MAX; pid++) {
1694 for (i = 0; i < mp4_descr_count; i++) {
1697 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1699 if (ts->pids[pid]->type != MPEGTS_PES) {
1700 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1703 pes = ts->pids[pid]->u.pes_filter.opaque;
1708 pes->sl = mp4_descr[i].sl;
1710 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1711 mp4_descr[i].dec_config_descr_len, 0,
1712 NULL, NULL, NULL, NULL);
1713 ff_mp4_read_dec_config_descr(s, st, &pb);
1714 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1715 st->codecpar->extradata_size > 0)
1716 st->need_parsing = 0;
1717 if (st->codecpar->codec_id == AV_CODEC_ID_H264 &&
1718 st->codecpar->extradata_size > 0)
1719 st->need_parsing = 0;
1721 st->codecpar->codec_type = avcodec_get_type(st->codecpar->codec_id);
1722 st->internal->need_context_update = 1;
1725 for (i = 0; i < mp4_descr_count; i++)
1726 av_free(mp4_descr[i].dec_config_descr);
1729 static void scte_data_cb(MpegTSFilter *filter, const uint8_t *section,
1732 AVProgram *prg = NULL;
1733 MpegTSContext *ts = filter->u.section_filter.opaque;
1735 int idx = ff_find_stream_index(ts->stream, filter->pid);
1740 * In case we receive an SCTE-35 packet before mpegts context is fully
1746 new_data_packet(section, section_len, ts->pkt);
1747 ts->pkt->stream_index = idx;
1748 prg = av_find_program_from_stream(ts->stream, NULL, idx);
1749 if (prg && prg->pcr_pid != -1 && prg->discard != AVDISCARD_ALL) {
1750 MpegTSFilter *f = ts->pids[prg->pcr_pid];
1751 if (f && f->last_pcr != -1)
1752 ts->pkt->pts = ts->pkt->dts = f->last_pcr/300;
1758 static const uint8_t opus_coupled_stream_cnt[9] = {
1759 1, 0, 1, 1, 2, 2, 2, 3, 3
1762 static const uint8_t opus_stream_cnt[9] = {
1763 1, 1, 1, 2, 2, 3, 4, 4, 5,
1766 static const uint8_t opus_channel_map[8][8] = {
1774 { 0,6,1,2,3,4,5,7 },
1777 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1778 const uint8_t **pp, const uint8_t *desc_list_end,
1779 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1782 const uint8_t *desc_end;
1783 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1787 desc_tag = get8(pp, desc_list_end);
1789 return AVERROR_INVALIDDATA;
1790 desc_len = get8(pp, desc_list_end);
1792 return AVERROR_INVALIDDATA;
1793 desc_end = *pp + desc_len;
1794 if (desc_end > desc_list_end)
1795 return AVERROR_INVALIDDATA;
1797 av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1799 if ((st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1800 stream_type == STREAM_TYPE_PRIVATE_DATA)
1801 mpegts_find_stream_type(st, desc_tag, DESC_types);
1804 case 0x02: /* video stream descriptor */
1805 if (get8(pp, desc_end) & 0x1) {
1806 st->disposition |= AV_DISPOSITION_STILL_IMAGE;
1809 case 0x1E: /* SL descriptor */
1810 desc_es_id = get16(pp, desc_end);
1813 if (ts && ts->pids[pid])
1814 ts->pids[pid]->es_id = desc_es_id;
1815 for (i = 0; i < mp4_descr_count; i++)
1816 if (mp4_descr[i].dec_config_descr_len &&
1817 mp4_descr[i].es_id == desc_es_id) {
1819 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1820 mp4_descr[i].dec_config_descr_len, 0,
1821 NULL, NULL, NULL, NULL);
1822 ff_mp4_read_dec_config_descr(fc, st, &pb);
1823 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1824 st->codecpar->extradata_size > 0) {
1825 st->need_parsing = 0;
1826 st->internal->need_context_update = 1;
1828 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1829 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1832 case 0x1F: /* FMC descriptor */
1833 if (get16(pp, desc_end) < 0)
1835 if (mp4_descr_count > 0 &&
1836 (st->codecpar->codec_id == AV_CODEC_ID_AAC_LATM ||
1837 (st->request_probe == 0 && st->codecpar->codec_id == AV_CODEC_ID_NONE) ||
1838 st->request_probe > 0) &&
1839 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1841 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1842 mp4_descr->dec_config_descr_len, 0,
1843 NULL, NULL, NULL, NULL);
1844 ff_mp4_read_dec_config_descr(fc, st, &pb);
1845 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1846 st->codecpar->extradata_size > 0) {
1847 st->request_probe = st->need_parsing = 0;
1848 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
1849 st->internal->need_context_update = 1;
1853 case 0x56: /* DVB teletext descriptor */
1855 uint8_t *extradata = NULL;
1856 int language_count = desc_len / 5, ret;
1858 if (desc_len > 0 && desc_len % 5 != 0)
1859 return AVERROR_INVALIDDATA;
1861 if (language_count > 0) {
1862 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1863 av_assert0(language_count <= sizeof(language) / 4);
1865 if (st->codecpar->extradata == NULL) {
1866 ret = ff_alloc_extradata(st->codecpar, language_count * 2);
1871 if (st->codecpar->extradata_size < language_count * 2)
1872 return AVERROR_INVALIDDATA;
1874 extradata = st->codecpar->extradata;
1876 for (i = 0; i < language_count; i++) {
1877 language[i * 4 + 0] = get8(pp, desc_end);
1878 language[i * 4 + 1] = get8(pp, desc_end);
1879 language[i * 4 + 2] = get8(pp, desc_end);
1880 language[i * 4 + 3] = ',';
1882 memcpy(extradata, *pp, 2);
1888 language[i * 4 - 1] = 0;
1889 av_dict_set(&st->metadata, "language", language, 0);
1890 st->internal->need_context_update = 1;
1894 case 0x59: /* subtitling descriptor */
1896 /* 8 bytes per DVB subtitle substream data:
1897 * ISO_639_language_code (3 bytes),
1898 * subtitling_type (1 byte),
1899 * composition_page_id (2 bytes),
1900 * ancillary_page_id (2 bytes) */
1901 int language_count = desc_len / 8, ret;
1903 if (desc_len > 0 && desc_len % 8 != 0)
1904 return AVERROR_INVALIDDATA;
1906 if (language_count > 1) {
1907 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1910 if (language_count > 0) {
1913 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1914 av_assert0(language_count <= sizeof(language) / 4);
1916 if (st->codecpar->extradata == NULL) {
1917 ret = ff_alloc_extradata(st->codecpar, language_count * 5);
1922 if (st->codecpar->extradata_size < language_count * 5)
1923 return AVERROR_INVALIDDATA;
1925 extradata = st->codecpar->extradata;
1927 for (i = 0; i < language_count; i++) {
1928 language[i * 4 + 0] = get8(pp, desc_end);
1929 language[i * 4 + 1] = get8(pp, desc_end);
1930 language[i * 4 + 2] = get8(pp, desc_end);
1931 language[i * 4 + 3] = ',';
1933 /* hearing impaired subtitles detection using subtitling_type */
1935 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1936 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1937 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1938 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1939 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1940 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1941 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1945 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1946 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1952 language[i * 4 - 1] = 0;
1953 av_dict_set(&st->metadata, "language", language, 0);
1954 st->internal->need_context_update = 1;
1958 case 0x0a: /* ISO 639 language descriptor */
1959 for (i = 0; i + 4 <= desc_len; i += 4) {
1960 language[i + 0] = get8(pp, desc_end);
1961 language[i + 1] = get8(pp, desc_end);
1962 language[i + 2] = get8(pp, desc_end);
1963 language[i + 3] = ',';
1964 switch (get8(pp, desc_end)) {
1966 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1969 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1972 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1973 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
1977 if (i && language[0]) {
1978 language[i - 1] = 0;
1979 /* don't overwrite language, as it may already have been set by
1980 * another, more specific descriptor (e.g. supplementary audio) */
1981 av_dict_set(&st->metadata, "language", language, AV_DICT_DONT_OVERWRITE);
1984 case 0x05: /* registration descriptor */
1985 st->codecpar->codec_tag = bytestream_get_le32(pp);
1986 av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codecpar->codec_tag);
1987 if (st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) {
1988 mpegts_find_stream_type(st, st->codecpar->codec_tag, REGD_types);
1989 if (st->codecpar->codec_tag == MKTAG('B', 'S', 'S', 'D'))
1990 st->request_probe = 50;
1993 case 0x52: /* stream identifier descriptor */
1994 st->stream_identifier = 1 + get8(pp, desc_end);
1996 case 0x26: /* metadata descriptor */
1997 if (get16(pp, desc_end) == 0xFFFF)
1999 if (get8(pp, desc_end) == 0xFF) {
2000 st->codecpar->codec_tag = bytestream_get_le32(pp);
2001 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
2002 mpegts_find_stream_type(st, st->codecpar->codec_tag, METADATA_types);
2005 case 0x7f: /* DVB extension descriptor */
2006 ext_desc_tag = get8(pp, desc_end);
2007 if (ext_desc_tag < 0)
2008 return AVERROR_INVALIDDATA;
2009 if (st->codecpar->codec_id == AV_CODEC_ID_OPUS &&
2010 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
2011 if (!st->codecpar->extradata) {
2012 st->codecpar->extradata = av_mallocz(sizeof(opus_default_extradata) +
2013 AV_INPUT_BUFFER_PADDING_SIZE);
2014 if (!st->codecpar->extradata)
2015 return AVERROR(ENOMEM);
2017 st->codecpar->extradata_size = sizeof(opus_default_extradata);
2018 memcpy(st->codecpar->extradata, opus_default_extradata, sizeof(opus_default_extradata));
2020 channel_config_code = get8(pp, desc_end);
2021 if (channel_config_code < 0)
2022 return AVERROR_INVALIDDATA;
2023 if (channel_config_code <= 0x8) {
2024 st->codecpar->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
2025 st->codecpar->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
2026 st->codecpar->extradata[19] = opus_stream_cnt[channel_config_code];
2027 st->codecpar->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
2028 memcpy(&st->codecpar->extradata[21], opus_channel_map[channels - 1], channels);
2030 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
2032 st->need_parsing = AVSTREAM_PARSE_FULL;
2033 st->internal->need_context_update = 1;
2036 if (ext_desc_tag == 0x06) { /* supplementary audio descriptor */
2040 return AVERROR_INVALIDDATA;
2041 flags = get8(pp, desc_end);
2043 if ((flags & 0x80) == 0) /* mix_type */
2044 st->disposition |= AV_DISPOSITION_DEPENDENT;
2046 switch ((flags >> 2) & 0x1F) { /* editorial_classification */
2048 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
2049 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2052 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
2055 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
2059 if (flags & 0x01) { /* language_code_present */
2061 return AVERROR_INVALIDDATA;
2062 language[0] = get8(pp, desc_end);
2063 language[1] = get8(pp, desc_end);
2064 language[2] = get8(pp, desc_end);
2067 /* This language always has to override a possible
2068 * ISO 639 language descriptor language */
2070 av_dict_set(&st->metadata, "language", language, 0);
2074 case 0x6a: /* ac-3_descriptor */
2076 int component_type_flag = get8(pp, desc_end) & (1 << 7);
2077 if (component_type_flag) {
2078 int component_type = get8(pp, desc_end);
2079 int service_type_mask = 0x38; // 0b00111000
2080 int service_type = ((component_type & service_type_mask) >> 3);
2081 if (service_type == 0x02 /* 0b010 */) {
2082 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2083 av_log(ts ? ts->stream : fc, AV_LOG_DEBUG, "New track disposition for id %u: %u\n", st->id, st->disposition);
2088 case 0x7a: /* enhanced_ac-3_descriptor */
2090 int component_type_flag = get8(pp, desc_end) & (1 << 7);
2091 if (component_type_flag) {
2092 int component_type = get8(pp, desc_end);
2093 int service_type_mask = 0x38; // 0b00111000
2094 int service_type = ((component_type & service_type_mask) >> 3);
2095 if (service_type == 0x02 /* 0b010 */) {
2096 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2097 av_log(ts ? ts->stream : fc, AV_LOG_DEBUG, "New track disposition for id %u: %u\n", st->id, st->disposition);
2102 case 0xfd: /* ARIB data coding type descriptor */
2103 // STD-B24, fascicle 3, chapter 4 defines private_stream_1
2105 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
2106 // This structure is defined in STD-B10, part 1, listing 5.4 and
2108 // Listing of data_component_ids is in STD-B10, part 2, Annex J.
2109 // Component tag limits are documented in TR-B14, fascicle 2,
2110 // Vol. 3, Section 2, 4.2.8.1
2111 int actual_component_tag = st->stream_identifier - 1;
2112 int picked_profile = FF_PROFILE_UNKNOWN;
2113 int data_component_id = get16(pp, desc_end);
2114 if (data_component_id < 0)
2115 return AVERROR_INVALIDDATA;
2117 switch (data_component_id) {
2119 // [0x30..0x37] are component tags utilized for
2120 // non-mobile captioning service ("profile A").
2121 if (actual_component_tag >= 0x30 &&
2122 actual_component_tag <= 0x37) {
2123 picked_profile = FF_PROFILE_ARIB_PROFILE_A;
2127 // component tag 0x87 signifies a mobile/partial reception
2128 // (1seg) captioning service ("profile C").
2129 if (actual_component_tag == 0x87) {
2130 picked_profile = FF_PROFILE_ARIB_PROFILE_C;
2137 if (picked_profile == FF_PROFILE_UNKNOWN)
2140 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2141 st->codecpar->codec_id = AV_CODEC_ID_ARIB_CAPTION;
2142 st->codecpar->profile = picked_profile;
2143 st->request_probe = 0;
2146 case 0xb0: /* DOVI video stream descriptor */
2149 AVDOVIDecoderConfigurationRecord *dovi;
2152 if (desc_end - *pp < 4) // (8 + 8 + 7 + 6 + 1 + 1 + 1) / 8
2153 return AVERROR_INVALIDDATA;
2155 dovi = av_dovi_alloc(&dovi_size);
2157 return AVERROR(ENOMEM);
2159 dovi->dv_version_major = get8(pp, desc_end);
2160 dovi->dv_version_minor = get8(pp, desc_end);
2161 buf = get16(pp, desc_end);
2162 dovi->dv_profile = (buf >> 9) & 0x7f; // 7 bits
2163 dovi->dv_level = (buf >> 3) & 0x3f; // 6 bits
2164 dovi->rpu_present_flag = (buf >> 2) & 0x01; // 1 bit
2165 dovi->el_present_flag = (buf >> 1) & 0x01; // 1 bit
2166 dovi->bl_present_flag = buf & 0x01; // 1 bit
2167 if (desc_end - *pp >= 20) { // 4 + 4 * 4
2168 buf = get8(pp, desc_end);
2169 dovi->dv_bl_signal_compatibility_id = (buf >> 4) & 0x0f; // 4 bits
2171 // 0 stands for None
2172 // Dolby Vision V1.2.93 profiles and levels
2173 dovi->dv_bl_signal_compatibility_id = 0;
2176 ret = av_stream_add_side_data(st, AV_PKT_DATA_DOVI_CONF,
2177 (uint8_t *)dovi, dovi_size);
2183 av_log(fc, AV_LOG_TRACE, "DOVI, version: %d.%d, profile: %d, level: %d, "
2184 "rpu flag: %d, el flag: %d, bl flag: %d, compatibility id: %d\n",
2185 dovi->dv_version_major, dovi->dv_version_minor,
2186 dovi->dv_profile, dovi->dv_level,
2187 dovi->rpu_present_flag,
2188 dovi->el_present_flag,
2189 dovi->bl_present_flag,
2190 dovi->dv_bl_signal_compatibility_id);
2200 static AVStream *find_matching_stream(MpegTSContext *ts, int pid, unsigned int programid,
2201 int stream_identifier, int pmt_stream_idx)
2203 AVFormatContext *s = ts->stream;
2205 AVStream *found = NULL;
2207 for (i = 0; i < s->nb_streams; i++) {
2208 AVStream *st = s->streams[i];
2209 if (st->program_num != programid)
2211 if (stream_identifier != -1) { /* match based on "stream identifier descriptor" if present */
2212 if (st->stream_identifier == stream_identifier+1) {
2216 } else if (st->pmt_stream_idx == pmt_stream_idx) { /* match based on position within the PMT */
2223 av_log(ts->stream, AV_LOG_VERBOSE,
2224 "re-using existing %s stream %d (pid=0x%x) for new pid=0x%x\n",
2225 av_get_media_type_string(found->codecpar->codec_type),
2232 static int parse_stream_identifier_desc(const uint8_t *p, const uint8_t *p_end)
2234 const uint8_t **pp = &p;
2235 const uint8_t *desc_list_end;
2236 const uint8_t *desc_end;
2238 int desc_len, desc_tag;
2240 desc_list_len = get16(pp, p_end);
2241 if (desc_list_len < 0)
2243 desc_list_len &= 0xfff;
2244 desc_list_end = p + desc_list_len;
2245 if (desc_list_end > p_end)
2249 desc_tag = get8(pp, desc_list_end);
2252 desc_len = get8(pp, desc_list_end);
2255 desc_end = *pp + desc_len;
2256 if (desc_end > desc_list_end)
2259 if (desc_tag == 0x52) {
2260 return get8(pp, desc_end);
2268 static int is_pes_stream(int stream_type, uint32_t prog_reg_desc)
2270 return !(stream_type == 0x13 ||
2271 (stream_type == 0x86 && prog_reg_desc == AV_RL32("CUEI")) );
2274 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2276 MpegTSContext *ts = filter->u.section_filter.opaque;
2277 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2278 SectionHeader h1, *h = &h1;
2281 const uint8_t *p, *p_end, *desc_list_end;
2282 int program_info_length, pcr_pid, pid, stream_type;
2284 uint32_t prog_reg_desc = 0; /* registration descriptor */
2285 int stream_identifier = -1;
2287 int mp4_descr_count = 0;
2288 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
2291 av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
2292 hex_dump_debug(ts->stream, section, section_len);
2294 p_end = section + section_len - 4;
2296 if (parse_section_header(h, &p, p_end) < 0)
2298 if (h->tid != PMT_TID)
2300 if (skip_identical(h, tssf))
2303 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d version=%d tid=%d\n",
2304 h->id, h->sec_num, h->last_sec_num, h->version, h->tid);
2306 if (!ts->scan_all_pmts && ts->skip_changes)
2309 if (ts->skip_unknown_pmt && !get_program(ts, h->id))
2311 if (!ts->skip_clear)
2312 clear_program(ts, h->id);
2314 pcr_pid = get16(&p, p_end);
2318 add_pid_to_pmt(ts, h->id, pcr_pid);
2319 update_av_program_info(ts->stream, h->id, pcr_pid, h->version);
2321 av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
2323 program_info_length = get16(&p, p_end);
2324 if (program_info_length < 0)
2326 program_info_length &= 0xfff;
2327 while (program_info_length >= 2) {
2329 tag = get8(&p, p_end);
2330 len = get8(&p, p_end);
2332 av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
2334 if (len > program_info_length - 2)
2335 // something else is broken, exit the program_descriptors_loop
2337 program_info_length -= len + 2;
2338 if (tag == 0x1d) { // IOD descriptor
2339 get8(&p, p_end); // scope
2340 get8(&p, p_end); // label
2342 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
2343 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
2344 } else if (tag == 0x05 && len >= 4) { // registration descriptor
2345 prog_reg_desc = bytestream_get_le32(&p);
2350 p += program_info_length;
2354 // stop parsing after pmt, we found header
2355 if (!ts->stream->nb_streams)
2358 set_pmt_found(ts, h->id);
2361 for (i = 0; ; i++) {
2364 stream_type = get8(&p, p_end);
2365 if (stream_type < 0)
2367 pid = get16(&p, p_end);
2371 if (pid == ts->current_pid)
2374 if (ts->merge_pmt_versions)
2375 stream_identifier = parse_stream_identifier_desc(p, p_end);
2377 /* now create stream */
2378 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
2379 pes = ts->pids[pid]->u.pes_filter.opaque;
2380 if (ts->merge_pmt_versions && !pes->st) {
2381 st = find_matching_stream(ts, pid, h->id, stream_identifier, i);
2384 pes->stream_type = stream_type;
2389 pes->st = avformat_new_stream(pes->stream, NULL);
2392 pes->st->id = pes->pid;
2393 pes->st->program_num = h->id;
2394 pes->st->pmt_version = h->version;
2395 pes->st->pmt_stream_idx = i;
2398 } else if (is_pes_stream(stream_type, prog_reg_desc)) {
2400 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
2401 pes = add_pes_stream(ts, pid, pcr_pid);
2402 if (ts->merge_pmt_versions && pes && !pes->st) {
2403 st = find_matching_stream(ts, pid, h->id, stream_identifier, i);
2406 pes->stream_type = stream_type;
2410 if (pes && !pes->st) {
2411 st = avformat_new_stream(pes->stream, NULL);
2415 st->program_num = h->id;
2416 st->pmt_version = h->version;
2417 st->pmt_stream_idx = i;
2420 int idx = ff_find_stream_index(ts->stream, pid);
2422 st = ts->stream->streams[idx];
2424 if (ts->merge_pmt_versions && !st) {
2425 st = find_matching_stream(ts, pid, h->id, stream_identifier, i);
2428 st = avformat_new_stream(ts->stream, NULL);
2432 st->program_num = h->id;
2433 st->pmt_version = h->version;
2434 st->pmt_stream_idx = i;
2435 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
2436 if (stream_type == 0x86 && prog_reg_desc == AV_RL32("CUEI")) {
2437 mpegts_find_stream_type(st, stream_type, SCTE_types);
2438 mpegts_open_section_filter(ts, pid, scte_data_cb, ts, 1);
2446 if (pes && !pes->stream_type)
2447 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
2449 add_pid_to_pmt(ts, h->id, pid);
2451 av_program_add_stream_index(ts->stream, h->id, st->index);
2453 desc_list_len = get16(&p, p_end);
2454 if (desc_list_len < 0)
2456 desc_list_len &= 0xfff;
2457 desc_list_end = p + desc_list_len;
2458 if (desc_list_end > p_end)
2461 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
2462 desc_list_end, mp4_descr,
2463 mp4_descr_count, pid, ts) < 0)
2466 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
2467 stream_type == 0x83 && pes->sub_st) {
2468 av_program_add_stream_index(ts->stream, h->id,
2469 pes->sub_st->index);
2470 pes->sub_st->codecpar->codec_tag = st->codecpar->codec_tag;
2476 if (!ts->pids[pcr_pid])
2477 mpegts_open_pcr_filter(ts, pcr_pid);
2480 for (i = 0; i < mp4_descr_count; i++)
2481 av_free(mp4_descr[i].dec_config_descr);
2484 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2486 MpegTSContext *ts = filter->u.section_filter.opaque;
2487 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2488 SectionHeader h1, *h = &h1;
2489 const uint8_t *p, *p_end;
2493 av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
2494 hex_dump_debug(ts->stream, section, section_len);
2496 p_end = section + section_len - 4;
2498 if (parse_section_header(h, &p, p_end) < 0)
2500 if (h->tid != PAT_TID)
2502 if (ts->skip_changes)
2505 if (skip_identical(h, tssf))
2507 ts->stream->ts_id = h->id;
2511 sid = get16(&p, p_end);
2514 pmt_pid = get16(&p, p_end);
2519 if (pmt_pid == ts->current_pid)
2522 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
2524 if (sid == 0x0000) {
2527 MpegTSFilter *fil = ts->pids[pmt_pid];
2528 program = av_new_program(ts->stream, sid);
2530 program->program_num = sid;
2531 program->pmt_pid = pmt_pid;
2534 if ( fil->type != MPEGTS_SECTION
2535 || fil->pid != pmt_pid
2536 || fil->u.section_filter.section_cb != pmt_cb)
2537 mpegts_close_filter(ts, ts->pids[pmt_pid]);
2539 if (!ts->pids[pmt_pid])
2540 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2541 add_pat_entry(ts, sid);
2542 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2543 add_pid_to_pmt(ts, sid, pmt_pid);
2549 for (j=0; j<ts->stream->nb_programs; j++) {
2550 for (i = 0; i < ts->nb_prg; i++)
2551 if (ts->prg[i].id == ts->stream->programs[j]->id)
2553 if (i==ts->nb_prg && !ts->skip_clear)
2554 clear_avprogram(ts, ts->stream->programs[j]->id);
2559 static void eit_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2561 MpegTSContext *ts = filter->u.section_filter.opaque;
2562 const uint8_t *p, *p_end;
2563 SectionHeader h1, *h = &h1;
2566 * Sometimes we receive EPG packets but SDT table do not have
2567 * eit_pres_following or eit_sched turned on, so we open EPG
2568 * stream directly here.
2570 if (!ts->epg_stream) {
2571 ts->epg_stream = avformat_new_stream(ts->stream, NULL);
2572 if (!ts->epg_stream)
2574 ts->epg_stream->id = EIT_PID;
2575 ts->epg_stream->codecpar->codec_type = AVMEDIA_TYPE_DATA;
2576 ts->epg_stream->codecpar->codec_id = AV_CODEC_ID_EPG;
2579 if (ts->epg_stream->discard == AVDISCARD_ALL)
2582 p_end = section + section_len - 4;
2585 if (parse_section_header(h, &p, p_end) < 0)
2587 if (h->tid < EIT_TID || h->tid > OEITS_END_TID)
2590 av_log(ts->stream, AV_LOG_TRACE, "EIT: tid received = %.02x\n", h->tid);
2593 * Service_id 0xFFFF is reserved, it indicates that the current EIT table
2596 if (h->id == 0xFFFF) {
2597 av_log(ts->stream, AV_LOG_TRACE, "Scrambled EIT table received.\n");
2602 * In case we receive an EPG packet before mpegts context is fully
2608 new_data_packet(section, section_len, ts->pkt);
2609 ts->pkt->stream_index = ts->epg_stream->index;
2613 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2615 MpegTSContext *ts = filter->u.section_filter.opaque;
2616 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2617 SectionHeader h1, *h = &h1;
2618 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2619 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2620 char *name, *provider_name;
2622 av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
2623 hex_dump_debug(ts->stream, section, section_len);
2625 p_end = section + section_len - 4;
2627 if (parse_section_header(h, &p, p_end) < 0)
2629 if (h->tid != SDT_TID)
2631 if (ts->skip_changes)
2633 if (skip_identical(h, tssf))
2636 onid = get16(&p, p_end);
2639 val = get8(&p, p_end);
2643 sid = get16(&p, p_end);
2646 val = get8(&p, p_end);
2649 desc_list_len = get16(&p, p_end);
2650 if (desc_list_len < 0)
2652 desc_list_len &= 0xfff;
2653 desc_list_end = p + desc_list_len;
2654 if (desc_list_end > p_end)
2657 desc_tag = get8(&p, desc_list_end);
2660 desc_len = get8(&p, desc_list_end);
2661 desc_end = p + desc_len;
2662 if (desc_len < 0 || desc_end > desc_list_end)
2665 av_log(ts->stream, AV_LOG_TRACE, "tag: 0x%02x len=%d\n",
2666 desc_tag, desc_len);
2670 service_type = get8(&p, p_end);
2671 if (service_type < 0)
2673 provider_name = getstr8(&p, p_end);
2676 name = getstr8(&p, p_end);
2678 AVProgram *program = av_new_program(ts->stream, sid);
2680 av_dict_set(&program->metadata, "service_name", name, 0);
2681 av_dict_set(&program->metadata, "service_provider",
2686 av_free(provider_name);
2697 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2698 const uint8_t *packet);
2700 /* handle one TS packet */
2701 static int handle_packet(MpegTSContext *ts, const uint8_t *packet, int64_t pos)
2704 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2705 has_adaptation, has_payload;
2706 const uint8_t *p, *p_end;
2708 pid = AV_RB16(packet + 1) & 0x1fff;
2709 is_start = packet[1] & 0x40;
2710 tss = ts->pids[pid];
2711 if (ts->auto_guess && !tss && is_start) {
2712 add_pes_stream(ts, pid, -1);
2713 tss = ts->pids[pid];
2718 tss->discard = discard_pid(ts, pid);
2721 ts->current_pid = pid;
2723 afc = (packet[3] >> 4) & 3;
2724 if (afc == 0) /* reserved value */
2726 has_adaptation = afc & 2;
2727 has_payload = afc & 1;
2728 is_discontinuity = has_adaptation &&
2729 packet[4] != 0 && /* with length > 0 */
2730 (packet[5] & 0x80); /* and discontinuity indicated */
2732 /* continuity check (currently not used) */
2733 cc = (packet[3] & 0xf);
2734 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2735 cc_ok = pid == 0x1FFF || // null packet PID
2742 av_log(ts->stream, AV_LOG_DEBUG,
2743 "Continuity check failed for pid %d expected %d got %d\n",
2744 pid, expected_cc, cc);
2745 if (tss->type == MPEGTS_PES) {
2746 PESContext *pc = tss->u.pes_filter.opaque;
2747 pc->flags |= AV_PKT_FLAG_CORRUPT;
2751 if (packet[1] & 0x80) {
2752 av_log(ts->stream, AV_LOG_DEBUG, "Packet had TEI flag set; marking as corrupt\n");
2753 if (tss->type == MPEGTS_PES) {
2754 PESContext *pc = tss->u.pes_filter.opaque;
2755 pc->flags |= AV_PKT_FLAG_CORRUPT;
2760 if (has_adaptation) {
2763 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2764 tss->last_pcr = pcr_h * 300 + pcr_l;
2765 /* skip adaptation field */
2768 /* if past the end of packet, ignore */
2769 p_end = packet + TS_PACKET_SIZE;
2770 if (p >= p_end || !has_payload)
2774 av_assert0(pos >= TS_PACKET_SIZE);
2775 ts->pos47_full = pos - TS_PACKET_SIZE;
2778 if (tss->type == MPEGTS_SECTION) {
2780 /* pointer field present */
2782 if (len > p_end - p)
2785 /* write remaining section bytes */
2786 write_section_data(ts, tss,
2788 /* check whether filter has been closed */
2794 write_section_data(ts, tss,
2799 write_section_data(ts, tss,
2804 // stop find_stream_info from waiting for more streams
2805 // when all programs have received a PMT
2806 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2808 for (i = 0; i < ts->nb_prg; i++) {
2809 if (!ts->prg[i].pmt_found)
2812 if (i == ts->nb_prg && ts->nb_prg > 0) {
2814 for (i = 0; i < ts->stream->nb_streams; i++) {
2815 AVStream *st = ts->stream->streams[i];
2816 if (st->codecpar->codec_type >= 0)
2817 types |= 1<<st->codecpar->codec_type;
2819 if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2820 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2821 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2828 // Note: The position here points actually behind the current packet.
2829 if (tss->type == MPEGTS_PES) {
2830 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2831 pos - ts->raw_packet_size)) < 0)
2839 static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *current_packet)
2841 MpegTSContext *ts = s->priv_data;
2842 AVIOContext *pb = s->pb;
2844 uint64_t pos = avio_tell(pb);
2845 int64_t back = FFMIN(seekback, pos);
2847 //Special case for files like 01c56b0dc1.ts
2848 if (current_packet[0] == 0x80 && current_packet[12] == 0x47) {
2849 avio_seek(pb, 12 - back, SEEK_CUR);
2853 avio_seek(pb, -back, SEEK_CUR);
2855 for (i = 0; i < ts->resync_size; i++) {
2860 int new_packet_size, ret;
2861 avio_seek(pb, -1, SEEK_CUR);
2862 pos = avio_tell(pb);
2863 ret = ffio_ensure_seekback(pb, PROBE_PACKET_MAX_BUF);
2866 new_packet_size = get_packet_size(s);
2867 if (new_packet_size > 0 && new_packet_size != ts->raw_packet_size) {
2868 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", new_packet_size);
2869 ts->raw_packet_size = new_packet_size;
2871 avio_seek(pb, pos, SEEK_SET);
2875 av_log(s, AV_LOG_ERROR,
2876 "max resync size reached, could not find sync byte\n");
2878 return AVERROR_INVALIDDATA;
2881 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2882 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2883 const uint8_t **data)
2885 AVIOContext *pb = s->pb;
2889 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2890 if (len != TS_PACKET_SIZE)
2891 return len < 0 ? len : AVERROR_EOF;
2892 /* check packet sync byte */
2893 if ((*data)[0] != 0x47) {
2894 /* find a new packet start */
2896 if (mpegts_resync(s, raw_packet_size, *data) < 0)
2897 return AVERROR(EAGAIN);
2907 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2909 AVIOContext *pb = s->pb;
2910 int skip = raw_packet_size - TS_PACKET_SIZE;
2912 avio_skip(pb, skip);
2915 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2917 AVFormatContext *s = ts->stream;
2918 uint8_t packet[TS_PACKET_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
2919 const uint8_t *data;
2923 if (avio_tell(s->pb) != ts->last_pos) {
2925 av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
2926 /* seek detected, flush pes buffer */
2927 for (i = 0; i < NB_PID_MAX; i++) {
2929 if (ts->pids[i]->type == MPEGTS_PES) {
2930 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2931 av_buffer_unref(&pes->buffer);
2932 pes->data_index = 0;
2933 pes->state = MPEGTS_SKIP; /* skip until pes header */
2934 } else if (ts->pids[i]->type == MPEGTS_SECTION) {
2935 ts->pids[i]->u.section_filter.last_ver = -1;
2937 ts->pids[i]->last_cc = -1;
2938 ts->pids[i]->last_pcr = -1;
2945 memset(packet + TS_PACKET_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
2948 if (nb_packets != 0 && packet_num >= nb_packets ||
2949 ts->stop_parse > 1) {
2950 ret = AVERROR(EAGAIN);
2953 if (ts->stop_parse > 0)
2956 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2959 ret = handle_packet(ts, data, avio_tell(s->pb));
2960 finished_reading_packet(s, ts->raw_packet_size);
2964 ts->last_pos = avio_tell(s->pb);
2968 static int mpegts_probe(const AVProbeData *p)
2970 const int size = p->buf_size;
2974 int check_count = size / TS_FEC_PACKET_SIZE;
2975 #define CHECK_COUNT 10
2976 #define CHECK_BLOCK 100
2981 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2982 int left = FFMIN(check_count - i, CHECK_BLOCK);
2983 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , 1);
2984 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, 1);
2985 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , 1);
2986 score = FFMAX3(score, dvhs_score, fec_score);
2988 maxscore = FFMAX(maxscore, score);
2991 sumscore = sumscore * CHECK_COUNT / check_count;
2992 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2994 ff_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2996 if (check_count > CHECK_COUNT && sumscore > 6) {
2997 return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2998 } else if (check_count >= CHECK_COUNT && sumscore > 6) {
2999 return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
3000 } else if (check_count >= CHECK_COUNT && maxscore > 6) {
3001 return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
3002 } else if (sumscore > 6) {
3009 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
3010 * (-1) if not available */
3011 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
3013 int afc, len, flags;
3017 afc = (packet[3] >> 4) & 3;
3019 return AVERROR_INVALIDDATA;
3024 return AVERROR_INVALIDDATA;
3027 if (!(flags & 0x10))
3028 return AVERROR_INVALIDDATA;
3030 return AVERROR_INVALIDDATA;
3032 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
3033 *ppcr_low = ((p[4] & 1) << 8) | p[5];
3037 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
3039 /* NOTE: We attempt to seek on non-seekable files as well, as the
3040 * probe buffer usually is big enough. Only warn if the seek failed
3041 * on files where the seek should work. */
3042 if (avio_seek(pb, pos, SEEK_SET) < 0)
3043 av_log(s, (pb->seekable & AVIO_SEEKABLE_NORMAL) ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
3046 static int mpegts_read_header(AVFormatContext *s)
3048 MpegTSContext *ts = s->priv_data;
3049 AVIOContext *pb = s->pb;
3050 int64_t pos, probesize = s->probesize;
3052 s->internal->prefer_codec_framerate = 1;
3054 if (ffio_ensure_seekback(pb, probesize) < 0)
3055 av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
3057 pos = avio_tell(pb);
3058 ts->raw_packet_size = get_packet_size(s);
3059 if (ts->raw_packet_size <= 0) {
3060 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
3061 ts->raw_packet_size = TS_PACKET_SIZE;
3066 if (s->iformat == &ff_mpegts_demuxer) {
3069 /* first do a scan to get all the services */
3070 seek_back(s, pb, pos);
3072 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
3073 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
3074 mpegts_open_section_filter(ts, EIT_PID, eit_cb, ts, 1);
3076 handle_packets(ts, probesize / ts->raw_packet_size);
3077 /* if could not find service, enable auto_guess */
3081 av_log(ts->stream, AV_LOG_TRACE, "tuning done\n");
3083 s->ctx_flags |= AVFMTCTX_NOHEADER;
3086 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
3087 int64_t pcrs[2], pcr_h;
3088 int packet_count[2];
3089 uint8_t packet[TS_PACKET_SIZE];
3090 const uint8_t *data;
3092 /* only read packets */
3094 st = avformat_new_stream(s, NULL);
3096 return AVERROR(ENOMEM);
3097 avpriv_set_pts_info(st, 60, 1, 27000000);
3098 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
3099 st->codecpar->codec_id = AV_CODEC_ID_MPEG2TS;
3101 /* we iterate until we find two PCRs to estimate the bitrate */
3106 ret = read_packet(s, packet, ts->raw_packet_size, &data);
3109 pid = AV_RB16(data + 1) & 0x1fff;
3110 if ((pcr_pid == -1 || pcr_pid == pid) &&
3111 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
3112 finished_reading_packet(s, ts->raw_packet_size);
3114 packet_count[nb_pcrs] = nb_packets;
3115 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
3118 if (pcrs[1] - pcrs[0] > 0) {
3119 /* the difference needs to be positive to make sense for bitrate computation */
3122 av_log(ts->stream, AV_LOG_WARNING, "invalid pcr pair %"PRId64" >= %"PRId64"\n", pcrs[0], pcrs[1]);
3124 packet_count[0] = packet_count[1];
3129 finished_reading_packet(s, ts->raw_packet_size);
3134 /* NOTE1: the bitrate is computed without the FEC */
3135 /* NOTE2: it is only the bitrate of the start of the stream */
3136 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
3137 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
3138 s->bit_rate = TS_PACKET_SIZE * 8 * 27000000LL / ts->pcr_incr;
3139 st->codecpar->bit_rate = s->bit_rate;
3140 st->start_time = ts->cur_pcr;
3141 av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%d\n",
3142 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
3145 seek_back(s, pb, pos);
3149 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
3151 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
3153 MpegTSContext *ts = s->priv_data;
3155 int64_t pcr_h, next_pcr_h, pos;
3156 int pcr_l, next_pcr_l;
3157 uint8_t pcr_buf[12];
3158 const uint8_t *data;
3160 if ((ret = av_new_packet(pkt, TS_PACKET_SIZE)) < 0)
3162 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
3163 pkt->pos = avio_tell(s->pb);
3167 if (data != pkt->data)
3168 memcpy(pkt->data, data, ts->raw_packet_size);
3169 finished_reading_packet(s, ts->raw_packet_size);
3170 if (ts->mpeg2ts_compute_pcr) {
3171 /* compute exact PCR for each packet */
3172 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
3173 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
3174 pos = avio_tell(s->pb);
3175 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
3176 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
3177 avio_read(s->pb, pcr_buf, 12);
3178 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
3179 /* XXX: not precise enough */
3181 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
3186 avio_seek(s->pb, pos, SEEK_SET);
3187 /* no next PCR found: we use previous increment */
3188 ts->cur_pcr = pcr_h * 300 + pcr_l;
3190 pkt->pts = ts->cur_pcr;
3191 pkt->duration = ts->pcr_incr;
3192 ts->cur_pcr += ts->pcr_incr;
3194 pkt->stream_index = 0;
3198 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
3200 MpegTSContext *ts = s->priv_data;
3205 ret = handle_packets(ts, 0);
3207 av_packet_unref(ts->pkt);
3208 /* flush pes data left */
3209 for (i = 0; i < NB_PID_MAX; i++)
3210 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
3211 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
3212 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
3213 ret = new_pes_packet(pes, pkt);
3216 pes->state = MPEGTS_SKIP;
3223 if (!ret && pkt->size < 0)
3224 ret = AVERROR_INVALIDDATA;
3228 static void mpegts_free(MpegTSContext *ts)
3234 for (i = 0; i < FF_ARRAY_ELEMS(ts->pools); i++)
3235 av_buffer_pool_uninit(&ts->pools[i]);
3237 for (i = 0; i < NB_PID_MAX; i++)
3239 mpegts_close_filter(ts, ts->pids[i]);
3242 static int mpegts_read_close(AVFormatContext *s)
3244 MpegTSContext *ts = s->priv_data;
3249 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
3250 int64_t *ppos, int64_t pos_limit)
3252 MpegTSContext *ts = s->priv_data;
3253 int64_t pos, timestamp;
3254 uint8_t buf[TS_PACKET_SIZE];
3255 int pcr_l, pcr_pid =
3256 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
3257 int pos47 = ts->pos47_full % ts->raw_packet_size;
3259 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
3260 ts->raw_packet_size + pos47;
3261 while(pos < pos_limit) {
3262 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
3263 return AV_NOPTS_VALUE;
3264 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
3265 return AV_NOPTS_VALUE;
3266 if (buf[0] != 0x47) {
3267 if (mpegts_resync(s, TS_PACKET_SIZE, buf) < 0)
3268 return AV_NOPTS_VALUE;
3269 pos = avio_tell(s->pb);
3272 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
3273 parse_pcr(×tamp, &pcr_l, buf) == 0) {
3277 pos += ts->raw_packet_size;
3280 return AV_NOPTS_VALUE;
3283 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
3284 int64_t *ppos, int64_t pos_limit)
3286 MpegTSContext *ts = s->priv_data;
3288 int pos47 = ts->pos47_full % ts->raw_packet_size;
3289 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
3290 ff_read_frame_flush(s);
3291 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
3292 return AV_NOPTS_VALUE;
3293 while(pos < pos_limit) {
3296 av_init_packet(&pkt);
3297 ret = av_read_frame(s, &pkt);
3299 return AV_NOPTS_VALUE;
3300 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
3301 ff_reduce_index(s, pkt.stream_index);
3302 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
3303 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
3304 int64_t dts = pkt.dts;
3306 av_packet_unref(&pkt);
3311 av_packet_unref(&pkt);
3314 return AV_NOPTS_VALUE;
3317 /**************************************************************/
3318 /* parsing functions - called from other demuxers such as RTP */
3320 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
3324 ts = av_mallocz(sizeof(MpegTSContext));
3327 /* no stream case, currently used by RTP */
3328 ts->raw_packet_size = TS_PACKET_SIZE;
3332 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
3333 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
3334 mpegts_open_section_filter(ts, EIT_PID, eit_cb, ts, 1);
3339 /* return the consumed length if a packet was output, or -1 if no
3340 * packet is output */
3341 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
3342 const uint8_t *buf, int len)
3350 if (len < TS_PACKET_SIZE)
3351 return AVERROR_INVALIDDATA;
3352 if (buf[0] != 0x47) {
3356 handle_packet(ts, buf, len1 - len + TS_PACKET_SIZE);
3357 buf += TS_PACKET_SIZE;
3358 len -= TS_PACKET_SIZE;
3359 if (ts->stop_parse == 1)
3366 void avpriv_mpegts_parse_close(MpegTSContext *ts)
3372 AVInputFormat ff_mpegts_demuxer = {
3374 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
3375 .priv_data_size = sizeof(MpegTSContext),
3376 .read_probe = mpegts_probe,
3377 .read_header = mpegts_read_header,
3378 .read_packet = mpegts_read_packet,
3379 .read_close = mpegts_read_close,
3380 .read_timestamp = mpegts_get_dts,
3381 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
3382 .priv_class = &mpegts_class,
3385 AVInputFormat ff_mpegtsraw_demuxer = {
3386 .name = "mpegtsraw",
3387 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
3388 .priv_data_size = sizeof(MpegTSContext),
3389 .read_header = mpegts_read_header,
3390 .read_packet = mpegts_raw_read_packet,
3391 .read_close = mpegts_read_close,
3392 .read_timestamp = mpegts_get_dts,
3393 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
3394 .priv_class = &mpegtsraw_class,