2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavcodec/bytestream.h"
30 #include "libavcodec/get_bits.h"
31 #include "libavcodec/opus.h"
35 #include "avio_internal.h"
40 /* maximum size in which we look for synchronisation if
41 * synchronisation is lost */
42 #define MAX_RESYNC_SIZE 65536
44 #define MAX_PES_PAYLOAD 200 * 1024
46 #define MAX_MP4_DESCR_COUNT 16
48 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
50 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
51 (modulus) = (dividend) % (divisor); \
52 (prev_dividend) = (dividend); \
55 enum MpegTSFilterType {
60 typedef struct MpegTSFilter MpegTSFilter;
62 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
63 int is_start, int64_t pos);
65 typedef struct MpegTSPESFilter {
70 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
72 typedef void SetServiceCallback (void *opaque, int ret);
74 typedef struct MpegTSSectionFilter {
78 unsigned int check_crc : 1;
79 unsigned int end_of_section_reached : 1;
80 SectionCallback *section_cb;
82 } MpegTSSectionFilter;
87 int last_cc; /* last cc code (-1 if first packet) */
88 enum MpegTSFilterType type;
90 MpegTSPESFilter pes_filter;
91 MpegTSSectionFilter section_filter;
95 #define MAX_PIDS_PER_PROGRAM 64
97 unsigned int id; // program id/service id
99 unsigned int pids[MAX_PIDS_PER_PROGRAM];
102 struct MpegTSContext {
103 const AVClass *class;
105 AVFormatContext *stream;
106 /** raw packet size, including FEC if present */
110 /** position corresponding to pos47, or 0 if pos47 invalid */
113 /** if true, all pids are analyzed to find streams */
116 /** compute exact PCR for each transport stream packet */
117 int mpeg2ts_compute_pcr;
119 int64_t cur_pcr; /**< used to estimate the exact PCR */
120 int pcr_incr; /**< used to estimate the exact PCR */
122 /* data needed to handle file based ts */
123 /** stop parsing loop */
125 /** packet containing Audio/Video data */
127 /** to detect seek */
132 /******************************************/
133 /* private mpegts data */
135 /** structure to keep track of Program->pids mapping */
139 /** filters for various streams specified by PMT + for the PAT and PMT */
140 MpegTSFilter *pids[NB_PID_MAX];
143 #define MPEGTS_OPTIONS \
144 { "resync_size", "Size limit for looking up a new syncronization.", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT, { .i64 = MAX_RESYNC_SIZE}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }
146 static const AVOption options[] = {
151 static const AVClass mpegts_class = {
152 .class_name = "mpegts demuxer",
153 .item_name = av_default_item_name,
155 .version = LIBAVUTIL_VERSION_INT,
158 static const AVOption raw_options[] = {
160 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
161 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
162 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
163 { "ts_packetsize", "Output option carrying the raw packet size.",
164 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
166 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
170 static const AVClass mpegtsraw_class = {
171 .class_name = "mpegtsraw demuxer",
172 .item_name = av_default_item_name,
173 .option = raw_options,
174 .version = LIBAVUTIL_VERSION_INT,
177 /* TS stream handling */
182 MPEGTS_PESHEADER_FILL,
187 /* enough for PES header + length */
188 #define PES_START_SIZE 6
189 #define PES_HEADER_SIZE 9
190 #define MAX_PES_HEADER_SIZE (9 + 255)
192 typedef struct PESContext {
194 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
197 AVFormatContext *stream;
199 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
200 enum MpegTSState state;
201 /* used to get the format */
203 int flags; /**< copied to the AVPacket flags */
206 int extended_stream_id;
208 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
209 uint8_t header[MAX_PES_HEADER_SIZE];
214 extern AVInputFormat ff_mpegts_demuxer;
216 static void clear_program(MpegTSContext *ts, unsigned int programid)
220 for (i = 0; i < ts->nb_prg; i++)
221 if (ts->prg[i].id == programid)
222 ts->prg[i].nb_pids = 0;
225 static void clear_programs(MpegTSContext *ts)
231 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
234 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
238 p = &ts->prg[ts->nb_prg];
244 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
248 struct Program *p = NULL;
249 for (i = 0; i < ts->nb_prg; i++) {
250 if (ts->prg[i].id == programid) {
258 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
260 p->pids[p->nb_pids++] = pid;
264 * @brief discard_pid() decides if the pid is to be discarded according
265 * to caller's programs selection
266 * @param ts : - TS context
268 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
271 static int discard_pid(MpegTSContext *ts, unsigned int pid)
274 int used = 0, discarded = 0;
277 /* If none of the programs have .discard=AVDISCARD_ALL then there's
278 * no way we have to discard this packet */
279 for (k = 0; k < ts->stream->nb_programs; k++)
280 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
282 if (k == ts->stream->nb_programs)
285 for (i = 0; i < ts->nb_prg; i++) {
287 for (j = 0; j < p->nb_pids; j++) {
288 if (p->pids[j] != pid)
290 // is program with id p->id set to be discarded?
291 for (k = 0; k < ts->stream->nb_programs; k++) {
292 if (ts->stream->programs[k]->id == p->id) {
293 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
302 return !used && discarded;
306 * Assemble PES packets out of TS packets, and then call the "section_cb"
307 * function when they are complete.
309 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
310 const uint8_t *buf, int buf_size, int is_start)
312 MpegTSSectionFilter *tss = &tss1->u.section_filter;
316 memcpy(tss->section_buf, buf, buf_size);
317 tss->section_index = buf_size;
318 tss->section_h_size = -1;
319 tss->end_of_section_reached = 0;
321 if (tss->end_of_section_reached)
323 len = 4096 - tss->section_index;
326 memcpy(tss->section_buf + tss->section_index, buf, len);
327 tss->section_index += len;
330 /* compute section length if possible */
331 if (tss->section_h_size == -1 && tss->section_index >= 3) {
332 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
335 tss->section_h_size = len;
338 if (tss->section_h_size != -1 &&
339 tss->section_index >= tss->section_h_size) {
340 tss->end_of_section_reached = 1;
341 if (!tss->check_crc ||
342 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
343 tss->section_buf, tss->section_h_size) == 0)
344 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
348 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
350 SectionCallback *section_cb,
354 MpegTSFilter *filter;
355 MpegTSSectionFilter *sec;
357 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
359 if (pid >= NB_PID_MAX || ts->pids[pid])
361 filter = av_mallocz(sizeof(MpegTSFilter));
364 ts->pids[pid] = filter;
366 filter->type = MPEGTS_SECTION;
369 filter->last_cc = -1;
371 sec = &filter->u.section_filter;
372 sec->section_cb = section_cb;
373 sec->opaque = opaque;
374 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
375 sec->check_crc = check_crc;
376 if (!sec->section_buf) {
383 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
387 MpegTSFilter *filter;
388 MpegTSPESFilter *pes;
390 if (pid >= NB_PID_MAX || ts->pids[pid])
392 filter = av_mallocz(sizeof(MpegTSFilter));
396 ts->pids[pid] = filter;
397 filter->type = MPEGTS_PES;
400 filter->last_cc = -1;
402 pes = &filter->u.pes_filter;
403 pes->pes_cb = pes_cb;
404 pes->opaque = opaque;
408 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
413 if (filter->type == MPEGTS_SECTION)
414 av_freep(&filter->u.section_filter.section_buf);
415 else if (filter->type == MPEGTS_PES) {
416 PESContext *pes = filter->u.pes_filter.opaque;
417 av_buffer_unref(&pes->buffer);
418 /* referenced private data will be freed later in
419 * avformat_close_input */
420 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
421 av_freep(&filter->u.pes_filter.opaque);
426 ts->pids[pid] = NULL;
429 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
431 int stat[TS_MAX_PACKET_SIZE];
436 memset(stat, 0, packet_size * sizeof(int));
438 for (x = i = 0; i < size - 3; i++) {
439 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && (buf[i + 3] & 0x30)) {
441 if (stat[x] > best_score) {
442 best_score = stat[x];
449 if (x == packet_size)
456 /* autodetect fec presence. Must have at least 1024 bytes */
457 static int get_packet_size(const uint8_t *buf, int size)
459 int score, fec_score, dvhs_score;
461 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
462 return AVERROR_INVALIDDATA;
464 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
465 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
466 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
467 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
468 score, dvhs_score, fec_score);
470 if (score > fec_score && score > dvhs_score)
471 return TS_PACKET_SIZE;
472 else if (dvhs_score > score && dvhs_score > fec_score)
473 return TS_DVHS_PACKET_SIZE;
474 else if (score < fec_score && dvhs_score < fec_score)
475 return TS_FEC_PACKET_SIZE;
477 return AVERROR_INVALIDDATA;
480 typedef struct SectionHeader {
485 uint8_t last_sec_num;
488 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
495 return AVERROR_INVALIDDATA;
501 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
507 if ((p + 1) >= p_end)
508 return AVERROR_INVALIDDATA;
515 /* read and allocate a DVB string preceded by its length */
516 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
523 len = get8(&p, p_end);
526 if ((p + len) > p_end)
528 str = av_malloc(len + 1);
538 static int parse_section_header(SectionHeader *h,
539 const uint8_t **pp, const uint8_t *p_end)
543 val = get8(pp, p_end);
548 val = get16(pp, p_end);
552 val = get8(pp, p_end);
555 h->version = (val >> 1) & 0x1f;
556 val = get8(pp, p_end);
560 val = get8(pp, p_end);
563 h->last_sec_num = val;
568 uint32_t stream_type;
569 enum AVMediaType codec_type;
570 enum AVCodecID codec_id;
573 static const StreamType ISO_types[] = {
574 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
575 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
576 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
577 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
578 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
579 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
580 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
581 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
582 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
583 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
584 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
585 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
589 static const StreamType HDMV_types[] = {
590 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
591 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
592 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
593 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
594 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
595 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
596 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
597 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
602 static const StreamType MISC_types[] = {
603 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
604 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
608 static const StreamType REGD_types[] = {
609 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
610 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
611 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
612 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
613 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
614 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
615 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
616 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
617 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
621 /* descriptor present */
622 static const StreamType DESC_types[] = {
623 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
624 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
625 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
626 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
627 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
631 static void mpegts_find_stream_type(AVStream *st,
632 uint32_t stream_type,
633 const StreamType *types)
635 for (; types->stream_type; types++)
636 if (stream_type == types->stream_type) {
637 st->codec->codec_type = types->codec_type;
638 st->codec->codec_id = types->codec_id;
643 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
644 uint32_t stream_type, uint32_t prog_reg_desc)
646 avpriv_set_pts_info(st, 33, 1, 90000);
648 st->codec->codec_type = AVMEDIA_TYPE_DATA;
649 st->codec->codec_id = AV_CODEC_ID_NONE;
650 st->need_parsing = AVSTREAM_PARSE_FULL;
652 pes->stream_type = stream_type;
654 av_log(pes->stream, AV_LOG_DEBUG,
655 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
656 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
658 st->codec->codec_tag = pes->stream_type;
660 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
661 if (prog_reg_desc == AV_RL32("HDMV") &&
662 st->codec->codec_id == AV_CODEC_ID_NONE) {
663 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
664 if (pes->stream_type == 0x83) {
665 // HDMV TrueHD streams also contain an AC3 coded version of the
666 // audio track - add a second stream for this
668 // priv_data cannot be shared between streams
669 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
671 return AVERROR(ENOMEM);
672 memcpy(sub_pes, pes, sizeof(*sub_pes));
674 sub_st = avformat_new_stream(pes->stream, NULL);
677 return AVERROR(ENOMEM);
680 sub_st->id = pes->pid;
681 avpriv_set_pts_info(sub_st, 33, 1, 90000);
682 sub_st->priv_data = sub_pes;
683 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
684 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
685 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
686 sub_pes->sub_st = pes->sub_st = sub_st;
689 if (st->codec->codec_id == AV_CODEC_ID_NONE)
690 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
695 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
699 pkt->buf = pes->buffer;
700 pkt->data = pes->buffer->data;
701 pkt->size = pes->data_index;
703 if (pes->total_size != MAX_PES_PAYLOAD &&
704 pes->pes_header_size + pes->data_index != pes->total_size +
706 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
707 pes->flags |= AV_PKT_FLAG_CORRUPT;
709 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
711 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
712 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
713 pkt->stream_index = pes->sub_st->index;
715 pkt->stream_index = pes->st->index;
718 /* store position of first TS packet of this PES packet */
719 pkt->pos = pes->ts_packet_pos;
720 pkt->flags = pes->flags;
722 /* reset pts values */
723 pes->pts = AV_NOPTS_VALUE;
724 pes->dts = AV_NOPTS_VALUE;
730 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
731 const uint8_t *buf, int buf_size)
734 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
735 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
736 int dts_flag = -1, cts_flag = -1;
737 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
738 init_get_bits(&gb, buf, buf_size * 8);
740 if (sl->use_au_start)
741 au_start_flag = get_bits1(&gb);
743 au_end_flag = get_bits1(&gb);
744 if (!sl->use_au_start && !sl->use_au_end)
745 au_start_flag = au_end_flag = 1;
747 ocr_flag = get_bits1(&gb);
749 idle_flag = get_bits1(&gb);
751 padding_flag = get_bits1(&gb);
753 padding_bits = get_bits(&gb, 3);
755 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
756 if (sl->packet_seq_num_len)
757 skip_bits_long(&gb, sl->packet_seq_num_len);
758 if (sl->degr_prior_len)
760 skip_bits(&gb, sl->degr_prior_len);
762 skip_bits_long(&gb, sl->ocr_len);
764 if (sl->use_rand_acc_pt)
766 if (sl->au_seq_num_len > 0)
767 skip_bits_long(&gb, sl->au_seq_num_len);
768 if (sl->use_timestamps) {
769 dts_flag = get_bits1(&gb);
770 cts_flag = get_bits1(&gb);
773 if (sl->inst_bitrate_len)
774 inst_bitrate_flag = get_bits1(&gb);
776 dts = get_bits64(&gb, sl->timestamp_len);
778 cts = get_bits64(&gb, sl->timestamp_len);
780 skip_bits_long(&gb, sl->au_len);
781 if (inst_bitrate_flag)
782 skip_bits_long(&gb, sl->inst_bitrate_len);
785 if (dts != AV_NOPTS_VALUE)
787 if (cts != AV_NOPTS_VALUE)
790 if (sl->timestamp_len && sl->timestamp_res)
791 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
793 return (get_bits_count(&gb) + 7) >> 3;
796 /* return non zero if a packet could be constructed */
797 static int mpegts_push_data(MpegTSFilter *filter,
798 const uint8_t *buf, int buf_size, int is_start,
801 PESContext *pes = filter->u.pes_filter.opaque;
802 MpegTSContext *ts = pes->ts;
810 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
811 new_pes_packet(pes, ts->pkt);
814 pes->state = MPEGTS_HEADER;
816 pes->ts_packet_pos = pos;
819 while (buf_size > 0) {
820 switch (pes->state) {
822 len = PES_START_SIZE - pes->data_index;
825 memcpy(pes->header + pes->data_index, p, len);
826 pes->data_index += len;
829 if (pes->data_index == PES_START_SIZE) {
830 /* we got all the PES or section header. We can now
832 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
833 pes->header[2] == 0x01) {
834 /* it must be an mpeg2 PES stream */
835 code = pes->header[3] | 0x100;
836 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
839 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
841 pes->sub_st->discard == AVDISCARD_ALL)) ||
842 code == 0x1be) /* padding_stream */
845 /* stream not present in PMT */
847 pes->st = avformat_new_stream(ts->stream, NULL);
849 return AVERROR(ENOMEM);
850 pes->st->id = pes->pid;
851 mpegts_set_stream_info(pes->st, pes, 0, 0);
854 pes->total_size = AV_RB16(pes->header + 4);
855 /* NOTE: a zero total size means the PES size is
857 if (!pes->total_size)
858 pes->total_size = MAX_PES_PAYLOAD;
860 /* allocate pes buffer */
861 pes->buffer = av_buffer_alloc(pes->total_size +
862 FF_INPUT_BUFFER_PADDING_SIZE);
864 return AVERROR(ENOMEM);
866 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
867 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
868 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
869 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
870 pes->state = MPEGTS_PESHEADER;
871 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE) {
873 "pid=%x stream_type=%x probing\n",
876 pes->st->codec->codec_id = AV_CODEC_ID_PROBE;
879 pes->state = MPEGTS_PAYLOAD;
883 /* otherwise, it should be a table */
886 pes->state = MPEGTS_SKIP;
891 /**********************************************/
892 /* PES packing parsing */
893 case MPEGTS_PESHEADER:
894 len = PES_HEADER_SIZE - pes->data_index;
896 return AVERROR_INVALIDDATA;
899 memcpy(pes->header + pes->data_index, p, len);
900 pes->data_index += len;
903 if (pes->data_index == PES_HEADER_SIZE) {
904 pes->pes_header_size = pes->header[8] + 9;
905 pes->state = MPEGTS_PESHEADER_FILL;
908 case MPEGTS_PESHEADER_FILL:
909 len = pes->pes_header_size - pes->data_index;
911 return AVERROR_INVALIDDATA;
914 memcpy(pes->header + pes->data_index, p, len);
915 pes->data_index += len;
918 if (pes->data_index == pes->pes_header_size) {
920 unsigned int flags, pes_ext, skip;
922 flags = pes->header[7];
924 pes->pts = AV_NOPTS_VALUE;
925 pes->dts = AV_NOPTS_VALUE;
926 if ((flags & 0xc0) == 0x80) {
927 pes->dts = pes->pts = ff_parse_pes_pts(r);
929 } else if ((flags & 0xc0) == 0xc0) {
930 pes->pts = ff_parse_pes_pts(r);
932 pes->dts = ff_parse_pes_pts(r);
935 pes->extended_stream_id = -1;
936 if (flags & 0x01) { /* PES extension */
938 /* Skip PES private data, program packet sequence counter and P-STD buffer */
939 skip = (pes_ext >> 4) & 0xb;
942 if ((pes_ext & 0x41) == 0x01 &&
943 (r + 2) <= (pes->header + pes->pes_header_size)) {
944 /* PES extension 2 */
945 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
946 pes->extended_stream_id = r[1];
950 /* we got the full header. We parse it and get the payload */
951 pes->state = MPEGTS_PAYLOAD;
953 if (pes->stream_type == 0x12 && buf_size > 0) {
954 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
956 pes->pes_header_size += sl_header_bytes;
957 p += sl_header_bytes;
958 buf_size -= sl_header_bytes;
963 if (buf_size > 0 && pes->buffer) {
964 if (pes->data_index > 0 &&
965 pes->data_index + buf_size > pes->total_size) {
966 new_pes_packet(pes, ts->pkt);
967 pes->total_size = MAX_PES_PAYLOAD;
968 pes->buffer = av_buffer_alloc(pes->total_size +
969 FF_INPUT_BUFFER_PADDING_SIZE);
971 return AVERROR(ENOMEM);
973 } else if (pes->data_index == 0 &&
974 buf_size > pes->total_size) {
975 // pes packet size is < ts size packet and pes data is padded with 0xff
976 // not sure if this is legal in ts but see issue #2392
977 buf_size = pes->total_size;
979 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
980 pes->data_index += buf_size;
983 /* emit complete packets with known packet size
984 * decreases demuxer delay for infrequent packets like subtitles from
985 * a couple of seconds to milliseconds for properly muxed files.
986 * total_size is the number of bytes following pes_packet_length
987 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
988 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
989 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
991 new_pes_packet(pes, ts->pkt);
1003 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1008 /* if no pid found, then add a pid context */
1009 pes = av_mallocz(sizeof(PESContext));
1013 pes->stream = ts->stream;
1015 pes->pcr_pid = pcr_pid;
1016 pes->state = MPEGTS_SKIP;
1017 pes->pts = AV_NOPTS_VALUE;
1018 pes->dts = AV_NOPTS_VALUE;
1019 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1032 Mp4Descr *active_descr;
1034 int max_descr_count;
1036 } MP4DescrParseContext;
1038 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1039 const uint8_t *buf, unsigned size,
1040 Mp4Descr *descr, int max_descr_count)
1043 if (size > (1 << 30))
1044 return AVERROR_INVALIDDATA;
1046 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1047 NULL, NULL, NULL, NULL)) < 0)
1054 d->active_descr = NULL;
1055 d->max_descr_count = max_descr_count;
1060 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1062 int64_t new_off = avio_tell(pb);
1063 (*len) -= new_off - *off;
1067 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1070 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1073 int ret = parse_mp4_descr(d, off, len, 0);
1076 update_offsets(&d->pb, &off, &len);
1081 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1083 avio_rb16(&d->pb); // ID
1089 update_offsets(&d->pb, &off, &len);
1090 return parse_mp4_descr_arr(d, off, len);
1093 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1098 id_flags = avio_rb16(&d->pb);
1099 if (!(id_flags & 0x0020)) { // URL_Flag
1100 update_offsets(&d->pb, &off, &len);
1101 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1107 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1110 if (d->descr_count >= d->max_descr_count)
1111 return AVERROR_INVALIDDATA;
1112 ff_mp4_parse_es_descr(&d->pb, &es_id);
1113 d->active_descr = d->descr + (d->descr_count++);
1115 d->active_descr->es_id = es_id;
1116 update_offsets(&d->pb, &off, &len);
1117 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1118 update_offsets(&d->pb, &off, &len);
1120 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1121 d->active_descr = NULL;
1125 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1128 Mp4Descr *descr = d->active_descr;
1130 return AVERROR_INVALIDDATA;
1131 d->active_descr->dec_config_descr = av_malloc(len);
1132 if (!descr->dec_config_descr)
1133 return AVERROR(ENOMEM);
1134 descr->dec_config_descr_len = len;
1135 avio_read(&d->pb, descr->dec_config_descr, len);
1139 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1141 Mp4Descr *descr = d->active_descr;
1144 return AVERROR_INVALIDDATA;
1146 predefined = avio_r8(&d->pb);
1149 int flags = avio_r8(&d->pb);
1150 descr->sl.use_au_start = !!(flags & 0x80);
1151 descr->sl.use_au_end = !!(flags & 0x40);
1152 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1153 descr->sl.use_padding = !!(flags & 0x08);
1154 descr->sl.use_timestamps = !!(flags & 0x04);
1155 descr->sl.use_idle = !!(flags & 0x02);
1156 descr->sl.timestamp_res = avio_rb32(&d->pb);
1158 descr->sl.timestamp_len = avio_r8(&d->pb);
1159 descr->sl.ocr_len = avio_r8(&d->pb);
1160 descr->sl.au_len = avio_r8(&d->pb);
1161 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1162 lengths = avio_rb16(&d->pb);
1163 descr->sl.degr_prior_len = lengths >> 12;
1164 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1165 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1167 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1172 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1176 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1177 update_offsets(&d->pb, &off, &len);
1178 if (len < 0 || len1 > len || len1 <= 0) {
1179 av_log(d->s, AV_LOG_ERROR,
1180 "Tag %x length violation new length %d bytes remaining %d\n",
1182 return AVERROR_INVALIDDATA;
1185 if (d->level++ >= MAX_LEVEL) {
1186 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1190 if (target_tag && tag != target_tag) {
1191 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1198 parse_MP4IODescrTag(d, off, len1);
1201 parse_MP4ODescrTag(d, off, len1);
1204 parse_MP4ESDescrTag(d, off, len1);
1206 case MP4DecConfigDescrTag:
1207 parse_MP4DecConfigDescrTag(d, off, len1);
1210 parse_MP4SLDescrTag(d, off, len1);
1217 avio_seek(&d->pb, off + len1, SEEK_SET);
1221 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1222 Mp4Descr *descr, int *descr_count, int max_descr_count)
1224 MP4DescrParseContext d;
1227 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1231 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1233 *descr_count = d.descr_count;
1237 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1238 Mp4Descr *descr, int *descr_count, int max_descr_count)
1240 MP4DescrParseContext d;
1243 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1247 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1249 *descr_count = d.descr_count;
1253 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1256 MpegTSContext *ts = filter->u.section_filter.opaque;
1258 const uint8_t *p, *p_end;
1260 int mp4_descr_count = 0;
1261 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1263 AVFormatContext *s = ts->stream;
1265 p_end = section + section_len - 4;
1267 if (parse_section_header(&h, &p, p_end) < 0)
1269 if (h.tid != M4OD_TID)
1272 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1273 MAX_MP4_DESCR_COUNT);
1275 for (pid = 0; pid < NB_PID_MAX; pid++) {
1278 for (i = 0; i < mp4_descr_count; i++) {
1281 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1283 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1284 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1287 pes = ts->pids[pid]->u.pes_filter.opaque;
1292 pes->sl = mp4_descr[i].sl;
1294 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1295 mp4_descr[i].dec_config_descr_len, 0,
1296 NULL, NULL, NULL, NULL);
1297 ff_mp4_read_dec_config_descr(s, st, &pb);
1298 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1299 st->codec->extradata_size > 0)
1300 st->need_parsing = 0;
1301 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1302 st->codec->extradata_size > 0)
1303 st->need_parsing = 0;
1305 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1307 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1308 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1309 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1310 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1311 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1312 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1315 for (i = 0; i < mp4_descr_count; i++)
1316 av_free(mp4_descr[i].dec_config_descr);
1319 static const uint8_t opus_coupled_stream_cnt[9] = {
1320 1, 0, 1, 1, 2, 2, 2, 3, 3
1323 static const uint8_t opus_stream_cnt[9] = {
1324 1, 1, 1, 2, 2, 3, 4, 4, 5,
1327 static const uint8_t opus_channel_map[8][8] = {
1335 { 0,6,1,2,3,4,5,7 },
1338 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1339 const uint8_t **pp, const uint8_t *desc_list_end,
1340 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1343 const uint8_t *desc_end;
1344 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1348 desc_tag = get8(pp, desc_list_end);
1350 return AVERROR_INVALIDDATA;
1351 desc_len = get8(pp, desc_list_end);
1353 return AVERROR_INVALIDDATA;
1354 desc_end = *pp + desc_len;
1355 if (desc_end > desc_list_end)
1356 return AVERROR_INVALIDDATA;
1358 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1360 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1361 stream_type == STREAM_TYPE_PRIVATE_DATA)
1362 mpegts_find_stream_type(st, desc_tag, DESC_types);
1365 case 0x1E: /* SL descriptor */
1366 desc_es_id = get16(pp, desc_end);
1369 if (ts && ts->pids[pid])
1370 ts->pids[pid]->es_id = desc_es_id;
1371 for (i = 0; i < mp4_descr_count; i++)
1372 if (mp4_descr[i].dec_config_descr_len &&
1373 mp4_descr[i].es_id == desc_es_id) {
1375 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1376 mp4_descr[i].dec_config_descr_len, 0,
1377 NULL, NULL, NULL, NULL);
1378 ff_mp4_read_dec_config_descr(fc, st, &pb);
1379 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1380 st->codec->extradata_size > 0)
1381 st->need_parsing = 0;
1382 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1383 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1386 case 0x1F: /* FMC descriptor */
1387 if (get16(pp, desc_end) < 0)
1389 if (mp4_descr_count > 0 &&
1390 st->codec->codec_id == AV_CODEC_ID_AAC_LATM &&
1391 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1393 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1394 mp4_descr->dec_config_descr_len, 0,
1395 NULL, NULL, NULL, NULL);
1396 ff_mp4_read_dec_config_descr(fc, st, &pb);
1397 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1398 st->codec->extradata_size > 0)
1399 st->need_parsing = 0;
1402 case 0x56: /* DVB teletext descriptor */
1403 language[0] = get8(pp, desc_end);
1404 language[1] = get8(pp, desc_end);
1405 language[2] = get8(pp, desc_end);
1407 av_dict_set(&st->metadata, "language", language, 0);
1409 case 0x59: /* subtitling descriptor */
1410 language[0] = get8(pp, desc_end);
1411 language[1] = get8(pp, desc_end);
1412 language[2] = get8(pp, desc_end);
1414 /* hearing impaired subtitles detection */
1415 switch (get8(pp, desc_end)) {
1416 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1417 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1418 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1419 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1420 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1421 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1422 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1425 if (st->codec->extradata) {
1426 if (st->codec->extradata_size == 4 &&
1427 memcmp(st->codec->extradata, *pp, 4))
1428 avpriv_request_sample(fc, "DVB sub with multiple IDs");
1430 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1431 if (st->codec->extradata) {
1432 st->codec->extradata_size = 4;
1433 memcpy(st->codec->extradata, *pp, 4);
1437 av_dict_set(&st->metadata, "language", language, 0);
1439 case 0x0a: /* ISO 639 language descriptor */
1440 for (i = 0; i + 4 <= desc_len; i += 4) {
1441 language[i + 0] = get8(pp, desc_end);
1442 language[i + 1] = get8(pp, desc_end);
1443 language[i + 2] = get8(pp, desc_end);
1444 language[i + 3] = ',';
1445 switch (get8(pp, desc_end)) {
1447 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1450 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1453 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1457 if (i && language[0]) {
1458 language[i - 1] = 0;
1459 av_dict_set(&st->metadata, "language", language, 0);
1462 case 0x05: /* registration descriptor */
1463 st->codec->codec_tag = bytestream_get_le32(pp);
1464 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1465 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1466 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1468 case 0x7f: /* DVB extension descriptor */
1469 ext_desc_tag = get8(pp, desc_end);
1470 if (ext_desc_tag < 0)
1471 return AVERROR_INVALIDDATA;
1472 if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1473 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1474 if (!st->codec->extradata) {
1475 st->codec->extradata = av_mallocz(sizeof(opus_default_extradata) +
1476 FF_INPUT_BUFFER_PADDING_SIZE);
1477 if (!st->codec->extradata)
1478 return AVERROR(ENOMEM);
1480 st->codec->extradata_size = sizeof(opus_default_extradata);
1481 memcpy(st->codec->extradata, opus_default_extradata, sizeof(opus_default_extradata));
1483 channel_config_code = get8(pp, desc_end);
1484 if (channel_config_code < 0)
1485 return AVERROR_INVALIDDATA;
1486 if (channel_config_code <= 0x8) {
1487 st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1488 st->codec->extradata[18] = channel_config_code ? (channels > 2) : 255;
1489 st->codec->extradata[19] = opus_stream_cnt[channel_config_code];
1490 st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1491 memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1493 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1495 st->need_parsing = AVSTREAM_PARSE_FULL;
1506 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1508 MpegTSContext *ts = filter->u.section_filter.opaque;
1509 SectionHeader h1, *h = &h1;
1512 const uint8_t *p, *p_end, *desc_list_end;
1513 int program_info_length, pcr_pid, pid, stream_type;
1515 uint32_t prog_reg_desc = 0; /* registration descriptor */
1517 int mp4_descr_count = 0;
1518 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1521 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1522 hex_dump_debug(ts->stream, section, section_len);
1524 p_end = section + section_len - 4;
1526 if (parse_section_header(h, &p, p_end) < 0)
1529 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1530 h->id, h->sec_num, h->last_sec_num);
1532 if (h->tid != PMT_TID)
1535 clear_program(ts, h->id);
1536 pcr_pid = get16(&p, p_end);
1540 add_pid_to_pmt(ts, h->id, pcr_pid);
1542 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1544 program_info_length = get16(&p, p_end);
1545 if (program_info_length < 0)
1547 program_info_length &= 0xfff;
1548 while (program_info_length >= 2) {
1550 tag = get8(&p, p_end);
1551 len = get8(&p, p_end);
1553 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1555 if (len > program_info_length - 2)
1556 // something else is broken, exit the program_descriptors_loop
1558 program_info_length -= len + 2;
1559 if (tag == 0x1d) { // IOD descriptor
1560 get8(&p, p_end); // scope
1561 get8(&p, p_end); // label
1563 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1564 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1565 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1566 prog_reg_desc = bytestream_get_le32(&p);
1571 p += program_info_length;
1575 // stop parsing after pmt, we found header
1576 if (!ts->stream->nb_streams)
1583 stream_type = get8(&p, p_end);
1584 if (stream_type < 0)
1586 pid = get16(&p, p_end);
1591 /* now create stream */
1592 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1593 pes = ts->pids[pid]->u.pes_filter.opaque;
1595 pes->st = avformat_new_stream(pes->stream, NULL);
1596 pes->st->id = pes->pid;
1599 } else if (stream_type != 0x13) {
1601 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1602 pes = add_pes_stream(ts, pid, pcr_pid);
1604 st = avformat_new_stream(pes->stream, NULL);
1608 int idx = ff_find_stream_index(ts->stream, pid);
1610 st = ts->stream->streams[idx];
1612 st = avformat_new_stream(ts->stream, NULL);
1614 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1621 if (pes && !pes->stream_type)
1622 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1624 add_pid_to_pmt(ts, h->id, pid);
1626 ff_program_add_stream_index(ts->stream, h->id, st->index);
1628 desc_list_len = get16(&p, p_end);
1629 if (desc_list_len < 0)
1631 desc_list_len &= 0xfff;
1632 desc_list_end = p + desc_list_len;
1633 if (desc_list_end > p_end)
1636 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1637 desc_list_end, mp4_descr,
1638 mp4_descr_count, pid, ts) < 0)
1641 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1642 stream_type == 0x83 && pes->sub_st) {
1643 ff_program_add_stream_index(ts->stream, h->id,
1644 pes->sub_st->index);
1645 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1652 for (i = 0; i < mp4_descr_count; i++)
1653 av_free(mp4_descr[i].dec_config_descr);
1656 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1658 MpegTSContext *ts = filter->u.section_filter.opaque;
1659 SectionHeader h1, *h = &h1;
1660 const uint8_t *p, *p_end;
1663 av_dlog(ts->stream, "PAT:\n");
1664 hex_dump_debug(ts->stream, section, section_len);
1666 p_end = section + section_len - 4;
1668 if (parse_section_header(h, &p, p_end) < 0)
1670 if (h->tid != PAT_TID)
1675 sid = get16(&p, p_end);
1678 pmt_pid = get16(&p, p_end);
1683 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1685 if (sid == 0x0000) {
1688 av_new_program(ts->stream, sid);
1689 if (ts->pids[pmt_pid])
1690 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1691 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1692 add_pat_entry(ts, sid);
1693 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1694 add_pid_to_pmt(ts, sid, pmt_pid);
1699 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1701 MpegTSContext *ts = filter->u.section_filter.opaque;
1702 SectionHeader h1, *h = &h1;
1703 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1704 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1705 char *name, *provider_name;
1707 av_dlog(ts->stream, "SDT:\n");
1708 hex_dump_debug(ts->stream, section, section_len);
1710 p_end = section + section_len - 4;
1712 if (parse_section_header(h, &p, p_end) < 0)
1714 if (h->tid != SDT_TID)
1716 onid = get16(&p, p_end);
1719 val = get8(&p, p_end);
1723 sid = get16(&p, p_end);
1726 val = get8(&p, p_end);
1729 desc_list_len = get16(&p, p_end);
1730 if (desc_list_len < 0)
1732 desc_list_len &= 0xfff;
1733 desc_list_end = p + desc_list_len;
1734 if (desc_list_end > p_end)
1737 desc_tag = get8(&p, desc_list_end);
1740 desc_len = get8(&p, desc_list_end);
1741 desc_end = p + desc_len;
1742 if (desc_end > desc_list_end)
1745 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1746 desc_tag, desc_len);
1750 service_type = get8(&p, p_end);
1751 if (service_type < 0)
1753 provider_name = getstr8(&p, p_end);
1756 name = getstr8(&p, p_end);
1758 AVProgram *program = av_new_program(ts->stream, sid);
1760 av_dict_set(&program->metadata, "service_name", name, 0);
1761 av_dict_set(&program->metadata, "service_provider",
1766 av_free(provider_name);
1777 /* handle one TS packet */
1778 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1781 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1782 has_adaptation, has_payload;
1783 const uint8_t *p, *p_end;
1786 pid = AV_RB16(packet + 1) & 0x1fff;
1787 if (pid && discard_pid(ts, pid))
1789 is_start = packet[1] & 0x40;
1790 tss = ts->pids[pid];
1791 if (ts->auto_guess && !tss && is_start) {
1792 add_pes_stream(ts, pid, -1);
1793 tss = ts->pids[pid];
1798 afc = (packet[3] >> 4) & 3;
1799 if (afc == 0) /* reserved value */
1801 has_adaptation = afc & 2;
1802 has_payload = afc & 1;
1803 is_discontinuity = has_adaptation &&
1804 packet[4] != 0 && /* with length > 0 */
1805 (packet[5] & 0x80); /* and discontinuity indicated */
1807 /* continuity check (currently not used) */
1808 cc = (packet[3] & 0xf);
1809 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1810 cc_ok = pid == 0x1FFF || // null packet PID
1817 av_log(ts->stream, AV_LOG_WARNING,
1818 "Continuity check failed for pid %d expected %d got %d\n",
1819 pid, expected_cc, cc);
1820 if (tss->type == MPEGTS_PES) {
1821 PESContext *pc = tss->u.pes_filter.opaque;
1822 pc->flags |= AV_PKT_FLAG_CORRUPT;
1829 if (has_adaptation) {
1830 /* skip adaptation field */
1833 /* if past the end of packet, ignore */
1834 p_end = packet + TS_PACKET_SIZE;
1838 pos = avio_tell(ts->stream->pb);
1839 MOD_UNLIKELY(ts->pos47, pos, ts->raw_packet_size, ts->pos);
1841 if (tss->type == MPEGTS_SECTION) {
1843 /* pointer field present */
1845 if (p + len > p_end)
1848 /* write remaining section bytes */
1849 write_section_data(ts, tss,
1851 /* check whether filter has been closed */
1857 write_section_data(ts, tss,
1862 write_section_data(ts, tss,
1868 // Note: The position here points actually behind the current packet.
1869 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1870 pos - ts->raw_packet_size)) < 0)
1877 /* XXX: try to find a better synchro over several packets (use
1878 * get_packet_size() ?) */
1879 static int mpegts_resync(AVFormatContext *s)
1881 MpegTSContext *ts = s->priv_data;
1882 AVIOContext *pb = s->pb;
1885 for (i = 0; i < ts->resync_size; i++) {
1887 if (pb->eof_reached)
1890 avio_seek(pb, -1, SEEK_CUR);
1894 av_log(s, AV_LOG_ERROR,
1895 "max resync size reached, could not find sync byte\n");
1897 return AVERROR_INVALIDDATA;
1900 /* return AVERROR_something if error or EOF. Return 0 if OK. */
1901 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
1902 const uint8_t **data)
1904 AVIOContext *pb = s->pb;
1908 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
1909 if (len != TS_PACKET_SIZE)
1910 return len < 0 ? len : AVERROR_EOF;
1911 /* check packet sync byte */
1912 if ((*data)[0] != 0x47) {
1913 /* find a new packet start */
1914 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1915 if (mpegts_resync(s) < 0)
1916 return AVERROR(EAGAIN);
1926 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
1928 AVIOContext *pb = s->pb;
1929 int skip = raw_packet_size - TS_PACKET_SIZE;
1931 avio_skip(pb, skip);
1934 static int handle_packets(MpegTSContext *ts, int nb_packets)
1936 AVFormatContext *s = ts->stream;
1937 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
1938 const uint8_t *data;
1939 int packet_num, ret = 0;
1941 if (avio_tell(s->pb) != ts->last_pos) {
1943 av_dlog(ts->stream, "Skipping after seek\n");
1944 /* seek detected, flush pes buffer */
1945 for (i = 0; i < NB_PID_MAX; i++) {
1947 if (ts->pids[i]->type == MPEGTS_PES) {
1948 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1949 av_buffer_unref(&pes->buffer);
1950 pes->data_index = 0;
1951 pes->state = MPEGTS_SKIP; /* skip until pes header */
1953 ts->pids[i]->last_cc = -1;
1960 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1962 if (ts->stop_parse > 0)
1965 if (nb_packets != 0 && packet_num >= nb_packets)
1967 ret = read_packet(s, packet, ts->raw_packet_size, &data);
1970 ret = handle_packet(ts, data);
1971 finished_reading_packet(s, ts->raw_packet_size);
1975 ts->last_pos = avio_tell(s->pb);
1979 static int mpegts_probe(AVProbeData *p)
1981 const int size = p->buf_size;
1982 int score, fec_score, dvhs_score;
1983 int check_count = size / TS_FEC_PACKET_SIZE;
1984 #define CHECK_COUNT 10
1986 if (check_count < CHECK_COUNT)
1987 return AVERROR_INVALIDDATA;
1989 score = analyze(p->buf, TS_PACKET_SIZE * check_count,
1990 TS_PACKET_SIZE, NULL) * CHECK_COUNT / check_count;
1991 dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE * check_count,
1992 TS_DVHS_PACKET_SIZE, NULL) * CHECK_COUNT / check_count;
1993 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE * check_count,
1994 TS_FEC_PACKET_SIZE, NULL) * CHECK_COUNT / check_count;
1995 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
1996 score, dvhs_score, fec_score);
1998 /* we need a clear definition for the returned score otherwise
1999 * things will become messy sooner or later */
2000 if (score > fec_score && score > dvhs_score && score > 6)
2001 return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
2002 else if (dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6)
2003 return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
2004 else if (fec_score > 6)
2005 return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
2007 return AVERROR_INVALIDDATA;
2010 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2011 * (-1) if not available */
2012 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2014 int afc, len, flags;
2018 afc = (packet[3] >> 4) & 3;
2020 return AVERROR_INVALIDDATA;
2025 return AVERROR_INVALIDDATA;
2028 if (!(flags & 0x10))
2029 return AVERROR_INVALIDDATA;
2031 return AVERROR_INVALIDDATA;
2033 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2034 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2038 static int mpegts_read_header(AVFormatContext *s)
2040 MpegTSContext *ts = s->priv_data;
2041 AVIOContext *pb = s->pb;
2042 uint8_t buf[5 * 1024];
2046 /* read the first 1024 bytes to get packet size */
2047 pos = avio_tell(pb);
2048 len = avio_read(pb, buf, sizeof(buf));
2051 if (len != sizeof(buf))
2053 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
2054 if (ts->raw_packet_size <= 0)
2055 return AVERROR_INVALIDDATA;
2059 if (s->iformat == &ff_mpegts_demuxer) {
2062 /* first do a scan to get all the services */
2063 if (avio_seek(pb, pos, SEEK_SET) < 0 && pb->seekable)
2064 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
2066 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2068 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2070 handle_packets(ts, s->probesize / ts->raw_packet_size);
2071 /* if could not find service, enable auto_guess */
2075 av_dlog(ts->stream, "tuning done\n");
2077 s->ctx_flags |= AVFMTCTX_NOHEADER;
2080 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2081 int64_t pcrs[2], pcr_h;
2082 int packet_count[2];
2083 uint8_t packet[TS_PACKET_SIZE];
2084 const uint8_t *data;
2086 /* only read packets */
2088 st = avformat_new_stream(s, NULL);
2090 return AVERROR(ENOMEM);
2091 avpriv_set_pts_info(st, 60, 1, 27000000);
2092 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2093 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2095 /* we iterate until we find two PCRs to estimate the bitrate */
2100 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2103 pid = AV_RB16(data + 1) & 0x1fff;
2104 if ((pcr_pid == -1 || pcr_pid == pid) &&
2105 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2106 finished_reading_packet(s, ts->raw_packet_size);
2108 packet_count[nb_pcrs] = nb_packets;
2109 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2114 finished_reading_packet(s, ts->raw_packet_size);
2119 /* NOTE1: the bitrate is computed without the FEC */
2120 /* NOTE2: it is only the bitrate of the start of the stream */
2121 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2122 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2123 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2124 st->codec->bit_rate = s->bit_rate;
2125 st->start_time = ts->cur_pcr;
2126 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2127 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2130 avio_seek(pb, pos, SEEK_SET);
2134 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2136 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2138 MpegTSContext *ts = s->priv_data;
2140 int64_t pcr_h, next_pcr_h, pos;
2141 int pcr_l, next_pcr_l;
2142 uint8_t pcr_buf[12];
2143 const uint8_t *data;
2145 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2146 return AVERROR(ENOMEM);
2147 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2148 pkt->pos = avio_tell(s->pb);
2150 av_free_packet(pkt);
2153 if (data != pkt->data)
2154 memcpy(pkt->data, data, ts->raw_packet_size);
2155 finished_reading_packet(s, ts->raw_packet_size);
2156 if (ts->mpeg2ts_compute_pcr) {
2157 /* compute exact PCR for each packet */
2158 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2159 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2160 pos = avio_tell(s->pb);
2161 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2162 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2163 avio_read(s->pb, pcr_buf, 12);
2164 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2165 /* XXX: not precise enough */
2167 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2172 avio_seek(s->pb, pos, SEEK_SET);
2173 /* no next PCR found: we use previous increment */
2174 ts->cur_pcr = pcr_h * 300 + pcr_l;
2176 pkt->pts = ts->cur_pcr;
2177 pkt->duration = ts->pcr_incr;
2178 ts->cur_pcr += ts->pcr_incr;
2180 pkt->stream_index = 0;
2184 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2186 MpegTSContext *ts = s->priv_data;
2191 ret = handle_packets(ts, 0);
2193 /* flush pes data left */
2194 for (i = 0; i < NB_PID_MAX; i++)
2195 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2196 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2197 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2198 new_pes_packet(pes, pkt);
2199 pes->state = MPEGTS_SKIP;
2206 if (!ret && pkt->size < 0)
2207 ret = AVERROR(EINTR);
2211 static void mpegts_free(MpegTSContext *ts)
2217 for (i = 0; i < NB_PID_MAX; i++)
2219 mpegts_close_filter(ts, ts->pids[i]);
2222 static int mpegts_read_close(AVFormatContext *s)
2224 MpegTSContext *ts = s->priv_data;
2229 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2230 int64_t *ppos, int64_t pos_limit)
2232 MpegTSContext *ts = s->priv_data;
2233 int64_t pos, timestamp;
2234 uint8_t buf[TS_PACKET_SIZE];
2235 int pcr_l, pcr_pid =
2236 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2237 const int find_next = 1;
2239 ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) *
2240 ts->raw_packet_size + ts->pos47;
2243 avio_seek(s->pb, pos, SEEK_SET);
2244 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2245 return AV_NOPTS_VALUE;
2246 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2247 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2250 pos += ts->raw_packet_size;
2254 pos -= ts->raw_packet_size;
2256 return AV_NOPTS_VALUE;
2257 avio_seek(s->pb, pos, SEEK_SET);
2258 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2259 return AV_NOPTS_VALUE;
2260 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2261 parse_pcr(×tamp, &pcr_l, buf) == 0) {
2271 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
2273 MpegTSContext *ts = s->priv_data;
2274 uint8_t buf[TS_PACKET_SIZE];
2278 ret = ff_seek_frame_binary(s, stream_index, target_ts, flags);
2282 pos = avio_tell(s->pb);
2285 avio_seek(s->pb, pos, SEEK_SET);
2286 ret = avio_read(s->pb, buf, TS_PACKET_SIZE);
2289 if (ret != TS_PACKET_SIZE)
2291 // pid = AV_RB16(buf + 1) & 0x1fff;
2294 pos += ts->raw_packet_size;
2296 avio_seek(s->pb, pos, SEEK_SET);
2301 /**************************************************************/
2302 /* parsing functions - called from other demuxers such as RTP */
2304 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2308 ts = av_mallocz(sizeof(MpegTSContext));
2311 /* no stream case, currently used by RTP */
2312 ts->raw_packet_size = TS_PACKET_SIZE;
2318 /* return the consumed length if a packet was output, or -1 if no
2319 * packet is output */
2320 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2321 const uint8_t *buf, int len)
2329 if (ts->stop_parse > 0)
2331 if (len < TS_PACKET_SIZE)
2332 return AVERROR_INVALIDDATA;
2333 if (buf[0] != 0x47) {
2337 handle_packet(ts, buf);
2338 buf += TS_PACKET_SIZE;
2339 len -= TS_PACKET_SIZE;
2345 void ff_mpegts_parse_close(MpegTSContext *ts)
2351 AVInputFormat ff_mpegts_demuxer = {
2353 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2354 .priv_data_size = sizeof(MpegTSContext),
2355 .read_probe = mpegts_probe,
2356 .read_header = mpegts_read_header,
2357 .read_packet = mpegts_read_packet,
2358 .read_close = mpegts_read_close,
2359 .read_seek = read_seek,
2360 .read_timestamp = mpegts_get_pcr,
2361 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2362 .priv_class = &mpegts_class,
2365 AVInputFormat ff_mpegtsraw_demuxer = {
2366 .name = "mpegtsraw",
2367 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2368 .priv_data_size = sizeof(MpegTSContext),
2369 .read_header = mpegts_read_header,
2370 .read_packet = mpegts_raw_read_packet,
2371 .read_close = mpegts_read_close,
2372 .read_seek = read_seek,
2373 .read_timestamp = mpegts_get_pcr,
2374 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2375 .priv_class = &mpegtsraw_class,