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* MPEG2 transport stream (aka DVB) demuxer
3
* Copyright (c) 2002-2003 Fabrice Bellard
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* This file is part of Libav.
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//#define USE_SYNCPOINT_SEARCH
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#include "libavutil/crc.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/log.h"
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#include "libavutil/dict.h"
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#include "libavutil/opt.h"
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#include "libavcodec/bytestream.h"
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#include "avio_internal.h"
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/* maximum size in which we look for synchronisation if
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synchronisation is lost */
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#define MAX_RESYNC_SIZE 65536
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#define MAX_PES_PAYLOAD 200*1024
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enum MpegTSFilterType {
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typedef struct MpegTSFilter MpegTSFilter;
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typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
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typedef struct MpegTSPESFilter {
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typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
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typedef void SetServiceCallback(void *opaque, int ret);
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typedef struct MpegTSSectionFilter {
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unsigned int check_crc:1;
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unsigned int end_of_section_reached:1;
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SectionCallback *section_cb;
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} MpegTSSectionFilter;
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int last_cc; /* last cc code (-1 if first packet) */
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enum MpegTSFilterType type;
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MpegTSPESFilter pes_filter;
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MpegTSSectionFilter section_filter;
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#define MAX_PIDS_PER_PROGRAM 64
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unsigned int id; //program id/service id
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unsigned int pids[MAX_PIDS_PER_PROGRAM];
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struct MpegTSContext {
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AVFormatContext *stream;
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/** raw packet size, including FEC if present */
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/** if true, all pids are analyzed to find streams */
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/** compute exact PCR for each transport stream packet */
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int mpeg2ts_compute_pcr;
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int64_t cur_pcr; /**< used to estimate the exact PCR */
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int pcr_incr; /**< used to estimate the exact PCR */
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/* data needed to handle file based ts */
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/** stop parsing loop */
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/** packet containing Audio/Video data */
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/** to detect seek */
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/******************************************/
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/* private mpegts data */
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/** structure to keep track of Program->pids mapping */
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/** filters for various streams specified by PMT + for the PAT and PMT */
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MpegTSFilter *pids[NB_PID_MAX];
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static const AVOption options[] = {
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{"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), FF_OPT_TYPE_INT,
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{.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
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static const AVClass mpegtsraw_class = {
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.class_name = "mpegtsraw demuxer",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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/* TS stream handling */
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MPEGTS_PESHEADER_FILL,
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/* enough for PES header + length */
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#define PES_START_SIZE 6
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#define PES_HEADER_SIZE 9
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#define MAX_PES_HEADER_SIZE (9 + 255)
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typedef struct PESContext {
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int pcr_pid; /**< if -1 then all packets containing PCR are considered */
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AVFormatContext *stream;
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AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
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enum MpegTSState state;
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/* used to get the format */
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int extended_stream_id;
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int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
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uint8_t header[MAX_PES_HEADER_SIZE];
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extern AVInputFormat ff_mpegts_demuxer;
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static void clear_program(MpegTSContext *ts, unsigned int programid)
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for(i=0; i<ts->nb_prg; i++)
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if(ts->prg[i].id == programid)
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ts->prg[i].nb_pids = 0;
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static void clear_programs(MpegTSContext *ts)
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static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
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void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
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p = &ts->prg[ts->nb_prg];
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static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
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struct Program *p = NULL;
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for(i=0; i<ts->nb_prg; i++) {
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if(ts->prg[i].id == programid) {
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if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
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p->pids[p->nb_pids++] = pid;
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* \brief discard_pid() decides if the pid is to be discarded according
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* to caller's programs selection
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* \param ts : - TS context
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* \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
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static int discard_pid(MpegTSContext *ts, unsigned int pid)
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int used = 0, discarded = 0;
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for(i=0; i<ts->nb_prg; i++) {
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for(j=0; j<p->nb_pids; j++) {
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if(p->pids[j] != pid)
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//is program with id p->id set to be discarded?
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for(k=0; k<ts->stream->nb_programs; k++) {
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if(ts->stream->programs[k]->id == p->id) {
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if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
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return !used && discarded;
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* Assemble PES packets out of TS packets, and then call the "section_cb"
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* function when they are complete.
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static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
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const uint8_t *buf, int buf_size, int is_start)
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MpegTSSectionFilter *tss = &tss1->u.section_filter;
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memcpy(tss->section_buf, buf, buf_size);
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tss->section_index = buf_size;
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tss->section_h_size = -1;
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tss->end_of_section_reached = 0;
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if (tss->end_of_section_reached)
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len = 4096 - tss->section_index;
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memcpy(tss->section_buf + tss->section_index, buf, len);
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tss->section_index += len;
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/* compute section length if possible */
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if (tss->section_h_size == -1 && tss->section_index >= 3) {
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len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
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tss->section_h_size = len;
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if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
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tss->end_of_section_reached = 1;
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if (!tss->check_crc ||
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av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
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tss->section_buf, tss->section_h_size) == 0)
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tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
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static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
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SectionCallback *section_cb, void *opaque,
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MpegTSFilter *filter;
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MpegTSSectionFilter *sec;
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av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
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if (pid >= NB_PID_MAX || ts->pids[pid])
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filter = av_mallocz(sizeof(MpegTSFilter));
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ts->pids[pid] = filter;
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filter->type = MPEGTS_SECTION;
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filter->last_cc = -1;
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sec = &filter->u.section_filter;
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sec->section_cb = section_cb;
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sec->opaque = opaque;
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sec->section_buf = av_malloc(MAX_SECTION_SIZE);
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sec->check_crc = check_crc;
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if (!sec->section_buf) {
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static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
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MpegTSFilter *filter;
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MpegTSPESFilter *pes;
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if (pid >= NB_PID_MAX || ts->pids[pid])
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filter = av_mallocz(sizeof(MpegTSFilter));
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ts->pids[pid] = filter;
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filter->type = MPEGTS_PES;
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filter->last_cc = -1;
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pes = &filter->u.pes_filter;
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pes->pes_cb = pes_cb;
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pes->opaque = opaque;
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static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
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if (filter->type == MPEGTS_SECTION)
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av_freep(&filter->u.section_filter.section_buf);
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else if (filter->type == MPEGTS_PES) {
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PESContext *pes = filter->u.pes_filter.opaque;
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av_freep(&pes->buffer);
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/* referenced private data will be freed later in
362
* av_close_input_stream */
363
if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
364
av_freep(&filter->u.pes_filter.opaque);
369
ts->pids[pid] = NULL;
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static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
373
int stat[TS_MAX_PACKET_SIZE];
378
memset(stat, 0, packet_size*sizeof(int));
380
for(x=i=0; i<size-3; i++){
381
if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
383
if(stat[x] > best_score){
390
if(x == packet_size) x= 0;
396
/* autodetect fec presence. Must have at least 1024 bytes */
397
static int get_packet_size(const uint8_t *buf, int size)
399
int score, fec_score, dvhs_score;
401
if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
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score = analyze(buf, size, TS_PACKET_SIZE, NULL);
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dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
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fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
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// av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
409
if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
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else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
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else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
415
typedef struct SectionHeader {
420
uint8_t last_sec_num;
423
static inline int get8(const uint8_t **pp, const uint8_t *p_end)
436
static inline int get16(const uint8_t **pp, const uint8_t *p_end)
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if ((p + 1) >= p_end)
450
/* read and allocate a DVB string preceeded by its length */
451
static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
458
len = get8(&p, p_end);
461
if ((p + len) > p_end)
463
str = av_malloc(len + 1);
473
static int parse_section_header(SectionHeader *h,
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const uint8_t **pp, const uint8_t *p_end)
478
val = get8(pp, p_end);
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val = get16(pp, p_end);
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val = get8(pp, p_end);
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h->version = (val >> 1) & 0x1f;
491
val = get8(pp, p_end);
495
val = get8(pp, p_end);
498
h->last_sec_num = val;
503
uint32_t stream_type;
504
enum AVMediaType codec_type;
505
enum CodecID codec_id;
508
static const StreamType ISO_types[] = {
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{ 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
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{ 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
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{ 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
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{ 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
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{ 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
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{ 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
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{ 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
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{ 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
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{ 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
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{ 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
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static const StreamType HDMV_types[] = {
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{ 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
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{ 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
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{ 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
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{ 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
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{ 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
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{ 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
533
static const StreamType MISC_types[] = {
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{ 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
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{ 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
539
static const StreamType REGD_types[] = {
540
{ MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
541
{ MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
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{ MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
546
/* descriptor present */
547
static const StreamType DESC_types[] = {
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{ 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
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{ 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
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{ 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
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{ 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
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{ 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
556
static void mpegts_find_stream_type(AVStream *st,
557
uint32_t stream_type, const StreamType *types)
559
for (; types->stream_type; types++) {
560
if (stream_type == types->stream_type) {
561
st->codec->codec_type = types->codec_type;
562
st->codec->codec_id = types->codec_id;
568
static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
569
uint32_t stream_type, uint32_t prog_reg_desc)
571
av_set_pts_info(st, 33, 1, 90000);
573
st->codec->codec_type = AVMEDIA_TYPE_DATA;
574
st->codec->codec_id = CODEC_ID_NONE;
575
st->need_parsing = AVSTREAM_PARSE_FULL;
577
pes->stream_type = stream_type;
579
av_log(pes->stream, AV_LOG_DEBUG,
580
"stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
581
st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
583
st->codec->codec_tag = pes->stream_type;
585
mpegts_find_stream_type(st, pes->stream_type, ISO_types);
586
if (prog_reg_desc == AV_RL32("HDMV") &&
587
st->codec->codec_id == CODEC_ID_NONE) {
588
mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
589
if (pes->stream_type == 0x83) {
590
// HDMV TrueHD streams also contain an AC3 coded version of the
591
// audio track - add a second stream for this
593
// priv_data cannot be shared between streams
594
PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
596
return AVERROR(ENOMEM);
597
memcpy(sub_pes, pes, sizeof(*sub_pes));
599
sub_st = av_new_stream(pes->stream, pes->pid);
602
return AVERROR(ENOMEM);
605
av_set_pts_info(sub_st, 33, 1, 90000);
606
sub_st->priv_data = sub_pes;
607
sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
608
sub_st->codec->codec_id = CODEC_ID_AC3;
609
sub_st->need_parsing = AVSTREAM_PARSE_FULL;
610
sub_pes->sub_st = pes->sub_st = sub_st;
613
if (st->codec->codec_id == CODEC_ID_NONE)
614
mpegts_find_stream_type(st, pes->stream_type, MISC_types);
619
static void new_pes_packet(PESContext *pes, AVPacket *pkt)
623
pkt->destruct = av_destruct_packet;
624
pkt->data = pes->buffer;
625
pkt->size = pes->data_index;
626
memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
628
// Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
629
if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
630
pkt->stream_index = pes->sub_st->index;
632
pkt->stream_index = pes->st->index;
635
/* store position of first TS packet of this PES packet */
636
pkt->pos = pes->ts_packet_pos;
638
/* reset pts values */
639
pes->pts = AV_NOPTS_VALUE;
640
pes->dts = AV_NOPTS_VALUE;
645
/* return non zero if a packet could be constructed */
646
static int mpegts_push_data(MpegTSFilter *filter,
647
const uint8_t *buf, int buf_size, int is_start,
650
PESContext *pes = filter->u.pes_filter.opaque;
651
MpegTSContext *ts = pes->ts;
659
if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
660
new_pes_packet(pes, ts->pkt);
663
pes->state = MPEGTS_HEADER;
665
pes->ts_packet_pos = pos;
668
while (buf_size > 0) {
671
len = PES_START_SIZE - pes->data_index;
674
memcpy(pes->header + pes->data_index, p, len);
675
pes->data_index += len;
678
if (pes->data_index == PES_START_SIZE) {
679
/* we got all the PES or section header. We can now
681
if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
682
pes->header[2] == 0x01) {
683
/* it must be an mpeg2 PES stream */
684
code = pes->header[3] | 0x100;
685
av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
687
if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
688
code == 0x1be) /* padding_stream */
691
/* stream not present in PMT */
693
pes->st = av_new_stream(ts->stream, pes->pid);
695
return AVERROR(ENOMEM);
696
mpegts_set_stream_info(pes->st, pes, 0, 0);
699
pes->total_size = AV_RB16(pes->header + 4);
700
/* NOTE: a zero total size means the PES size is
702
if (!pes->total_size)
703
pes->total_size = MAX_PES_PAYLOAD;
705
/* allocate pes buffer */
706
pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
708
return AVERROR(ENOMEM);
710
if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
711
code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
712
code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
713
code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
714
pes->state = MPEGTS_PESHEADER;
715
if (pes->st->codec->codec_id == CODEC_ID_NONE) {
716
av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
717
pes->pid, pes->stream_type);
718
pes->st->codec->codec_id = CODEC_ID_PROBE;
721
pes->state = MPEGTS_PAYLOAD;
725
/* otherwise, it should be a table */
728
pes->state = MPEGTS_SKIP;
733
/**********************************************/
734
/* PES packing parsing */
735
case MPEGTS_PESHEADER:
736
len = PES_HEADER_SIZE - pes->data_index;
741
memcpy(pes->header + pes->data_index, p, len);
742
pes->data_index += len;
745
if (pes->data_index == PES_HEADER_SIZE) {
746
pes->pes_header_size = pes->header[8] + 9;
747
pes->state = MPEGTS_PESHEADER_FILL;
750
case MPEGTS_PESHEADER_FILL:
751
len = pes->pes_header_size - pes->data_index;
756
memcpy(pes->header + pes->data_index, p, len);
757
pes->data_index += len;
760
if (pes->data_index == pes->pes_header_size) {
762
unsigned int flags, pes_ext, skip;
764
flags = pes->header[7];
766
pes->pts = AV_NOPTS_VALUE;
767
pes->dts = AV_NOPTS_VALUE;
768
if ((flags & 0xc0) == 0x80) {
769
pes->dts = pes->pts = ff_parse_pes_pts(r);
771
} else if ((flags & 0xc0) == 0xc0) {
772
pes->pts = ff_parse_pes_pts(r);
774
pes->dts = ff_parse_pes_pts(r);
777
pes->extended_stream_id = -1;
778
if (flags & 0x01) { /* PES extension */
780
/* Skip PES private data, program packet sequence counter and P-STD buffer */
781
skip = (pes_ext >> 4) & 0xb;
784
if ((pes_ext & 0x41) == 0x01 &&
785
(r + 2) <= (pes->header + pes->pes_header_size)) {
786
/* PES extension 2 */
787
if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
788
pes->extended_stream_id = r[1];
792
/* we got the full header. We parse it and get the payload */
793
pes->state = MPEGTS_PAYLOAD;
798
if (buf_size > 0 && pes->buffer) {
799
if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
800
new_pes_packet(pes, ts->pkt);
801
pes->total_size = MAX_PES_PAYLOAD;
802
pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
804
return AVERROR(ENOMEM);
806
} else if (pes->data_index == 0 && buf_size > pes->total_size) {
807
// pes packet size is < ts size packet and pes data is padded with 0xff
808
// not sure if this is legal in ts but see issue #2392
809
buf_size = pes->total_size;
811
memcpy(pes->buffer+pes->data_index, p, buf_size);
812
pes->data_index += buf_size;
815
/* emit complete packets with known packet size
816
* decreases demuxer delay for infrequent packets like subtitles from
817
* a couple of seconds to milliseconds for properly muxed files.
818
* total_size is the number of bytes following pes_packet_length
819
* in the pes header, i.e. not counting the first 6 bytes */
820
if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
821
pes->pes_header_size + pes->data_index == pes->total_size + 6) {
823
new_pes_packet(pes, ts->pkt);
835
static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
840
/* if no pid found, then add a pid context */
841
pes = av_mallocz(sizeof(PESContext));
845
pes->stream = ts->stream;
847
pes->pcr_pid = pcr_pid;
848
pes->state = MPEGTS_SKIP;
849
pes->pts = AV_NOPTS_VALUE;
850
pes->dts = AV_NOPTS_VALUE;
851
tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
859
static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
860
int *es_id, uint8_t **dec_config_descr,
861
int *dec_config_descr_size)
867
ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);
869
len = ff_mp4_read_descr(s, &pb, &tag);
870
if (tag == MP4IODescrTag) {
871
avio_rb16(&pb); // ID
877
len = ff_mp4_read_descr(s, &pb, &tag);
878
if (tag == MP4ESDescrTag) {
879
*es_id = avio_rb16(&pb); /* ES_ID */
880
av_dlog(s, "ES_ID %#x\n", *es_id);
881
avio_r8(&pb); /* priority */
882
len = ff_mp4_read_descr(s, &pb, &tag);
883
if (tag == MP4DecConfigDescrTag) {
884
*dec_config_descr = av_malloc(len);
885
if (!*dec_config_descr)
886
return AVERROR(ENOMEM);
887
*dec_config_descr_size = len;
888
avio_read(&pb, *dec_config_descr, len);
895
int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
896
const uint8_t **pp, const uint8_t *desc_list_end,
897
int mp4_dec_config_descr_len, int mp4_es_id, int pid,
898
uint8_t *mp4_dec_config_descr)
900
const uint8_t *desc_end;
901
int desc_len, desc_tag;
905
desc_tag = get8(pp, desc_list_end);
908
desc_len = get8(pp, desc_list_end);
911
desc_end = *pp + desc_len;
912
if (desc_end > desc_list_end)
915
av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
917
if (st->codec->codec_id == CODEC_ID_NONE &&
918
stream_type == STREAM_TYPE_PRIVATE_DATA)
919
mpegts_find_stream_type(st, desc_tag, DESC_types);
922
case 0x1F: /* FMC descriptor */
924
if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
925
mp4_dec_config_descr_len && mp4_es_id == pid) {
927
ffio_init_context(&pb, mp4_dec_config_descr,
928
mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
929
ff_mp4_read_dec_config_descr(fc, st, &pb);
930
if (st->codec->codec_id == CODEC_ID_AAC &&
931
st->codec->extradata_size > 0)
932
st->need_parsing = 0;
935
case 0x56: /* DVB teletext descriptor */
936
language[0] = get8(pp, desc_end);
937
language[1] = get8(pp, desc_end);
938
language[2] = get8(pp, desc_end);
940
av_dict_set(&st->metadata, "language", language, 0);
942
case 0x59: /* subtitling descriptor */
943
language[0] = get8(pp, desc_end);
944
language[1] = get8(pp, desc_end);
945
language[2] = get8(pp, desc_end);
947
/* hearing impaired subtitles detection */
948
switch(get8(pp, desc_end)) {
949
case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
950
case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
951
case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
952
case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
953
case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
954
case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
955
st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
958
if (st->codec->extradata) {
959
if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
960
av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
962
st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
963
if (st->codec->extradata) {
964
st->codec->extradata_size = 4;
965
memcpy(st->codec->extradata, *pp, 4);
969
av_dict_set(&st->metadata, "language", language, 0);
971
case 0x0a: /* ISO 639 language descriptor */
972
for (i = 0; i + 4 <= desc_len; i += 4) {
973
language[i + 0] = get8(pp, desc_end);
974
language[i + 1] = get8(pp, desc_end);
975
language[i + 2] = get8(pp, desc_end);
976
language[i + 3] = ',';
977
switch (get8(pp, desc_end)) {
978
case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
979
case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
980
case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
985
av_dict_set(&st->metadata, "language", language, 0);
988
case 0x05: /* registration descriptor */
989
st->codec->codec_tag = bytestream_get_le32(pp);
990
av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
991
if (st->codec->codec_id == CODEC_ID_NONE &&
992
stream_type == STREAM_TYPE_PRIVATE_DATA)
993
mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1002
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1004
MpegTSContext *ts = filter->u.section_filter.opaque;
1005
SectionHeader h1, *h = &h1;
1008
const uint8_t *p, *p_end, *desc_list_end;
1009
int program_info_length, pcr_pid, pid, stream_type;
1011
uint32_t prog_reg_desc = 0; /* registration descriptor */
1012
uint8_t *mp4_dec_config_descr = NULL;
1013
int mp4_dec_config_descr_len = 0;
1016
av_dlog(ts->stream, "PMT: len %i\n", section_len);
1017
hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1019
p_end = section + section_len - 4;
1021
if (parse_section_header(h, &p, p_end) < 0)
1024
av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1025
h->id, h->sec_num, h->last_sec_num);
1027
if (h->tid != PMT_TID)
1030
clear_program(ts, h->id);
1031
pcr_pid = get16(&p, p_end) & 0x1fff;
1034
add_pid_to_pmt(ts, h->id, pcr_pid);
1036
av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1038
program_info_length = get16(&p, p_end) & 0xfff;
1039
if (program_info_length < 0)
1041
while(program_info_length >= 2) {
1043
tag = get8(&p, p_end);
1044
len = get8(&p, p_end);
1046
av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1048
if(len > program_info_length - 2)
1049
//something else is broken, exit the program_descriptors_loop
1051
program_info_length -= len + 2;
1052
if (tag == 0x1d) { // IOD descriptor
1053
get8(&p, p_end); // scope
1054
get8(&p, p_end); // label
1056
mp4_read_iods(ts->stream, p, len, &mp4_es_id,
1057
&mp4_dec_config_descr, &mp4_dec_config_descr_len);
1058
} else if (tag == 0x05 && len >= 4) { // registration descriptor
1059
prog_reg_desc = bytestream_get_le32(&p);
1064
p += program_info_length;
1068
// stop parsing after pmt, we found header
1069
if (!ts->stream->nb_streams)
1074
stream_type = get8(&p, p_end);
1075
if (stream_type < 0)
1077
pid = get16(&p, p_end) & 0x1fff;
1081
/* now create ffmpeg stream */
1082
if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1083
pes = ts->pids[pid]->u.pes_filter.opaque;
1085
pes->st = av_new_stream(pes->stream, pes->pid);
1088
if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1089
pes = add_pes_stream(ts, pid, pcr_pid);
1091
st = av_new_stream(pes->stream, pes->pid);
1097
if (!pes->stream_type)
1098
mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1100
add_pid_to_pmt(ts, h->id, pid);
1102
ff_program_add_stream_index(ts->stream, h->id, st->index);
1104
desc_list_len = get16(&p, p_end) & 0xfff;
1105
if (desc_list_len < 0)
1107
desc_list_end = p + desc_list_len;
1108
if (desc_list_end > p_end)
1111
if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1112
mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)
1115
if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1116
ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1117
pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1124
av_free(mp4_dec_config_descr);
1127
static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1129
MpegTSContext *ts = filter->u.section_filter.opaque;
1130
SectionHeader h1, *h = &h1;
1131
const uint8_t *p, *p_end;
1134
av_dlog(ts->stream, "PAT:\n");
1135
hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1137
p_end = section + section_len - 4;
1139
if (parse_section_header(h, &p, p_end) < 0)
1141
if (h->tid != PAT_TID)
1146
sid = get16(&p, p_end);
1149
pmt_pid = get16(&p, p_end) & 0x1fff;
1153
av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1155
if (sid == 0x0000) {
1158
av_new_program(ts->stream, sid);
1159
if (ts->pids[pmt_pid])
1160
mpegts_close_filter(ts, ts->pids[pmt_pid]);
1161
mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1162
add_pat_entry(ts, sid);
1163
add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1164
add_pid_to_pmt(ts, sid, pmt_pid);
1169
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1171
MpegTSContext *ts = filter->u.section_filter.opaque;
1172
SectionHeader h1, *h = &h1;
1173
const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1174
int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1175
char *name, *provider_name;
1177
av_dlog(ts->stream, "SDT:\n");
1178
hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1180
p_end = section + section_len - 4;
1182
if (parse_section_header(h, &p, p_end) < 0)
1184
if (h->tid != SDT_TID)
1186
onid = get16(&p, p_end);
1189
val = get8(&p, p_end);
1193
sid = get16(&p, p_end);
1196
val = get8(&p, p_end);
1199
desc_list_len = get16(&p, p_end) & 0xfff;
1200
if (desc_list_len < 0)
1202
desc_list_end = p + desc_list_len;
1203
if (desc_list_end > p_end)
1206
desc_tag = get8(&p, desc_list_end);
1209
desc_len = get8(&p, desc_list_end);
1210
desc_end = p + desc_len;
1211
if (desc_end > desc_list_end)
1214
av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1215
desc_tag, desc_len);
1219
service_type = get8(&p, p_end);
1220
if (service_type < 0)
1222
provider_name = getstr8(&p, p_end);
1225
name = getstr8(&p, p_end);
1227
AVProgram *program = av_new_program(ts->stream, sid);
1229
av_dict_set(&program->metadata, "service_name", name, 0);
1230
av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1234
av_free(provider_name);
1245
/* handle one TS packet */
1246
static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1248
AVFormatContext *s = ts->stream;
1250
int len, pid, cc, cc_ok, afc, is_start;
1251
const uint8_t *p, *p_end;
1254
pid = AV_RB16(packet + 1) & 0x1fff;
1255
if(pid && discard_pid(ts, pid))
1257
is_start = packet[1] & 0x40;
1258
tss = ts->pids[pid];
1259
if (ts->auto_guess && tss == NULL && is_start) {
1260
add_pes_stream(ts, pid, -1);
1261
tss = ts->pids[pid];
1266
/* continuity check (currently not used) */
1267
cc = (packet[3] & 0xf);
1268
cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1271
/* skip adaptation field */
1272
afc = (packet[3] >> 4) & 3;
1274
if (afc == 0) /* reserved value */
1276
if (afc == 2) /* adaptation field only */
1279
/* skip adapation field */
1282
/* if past the end of packet, ignore */
1283
p_end = packet + TS_PACKET_SIZE;
1287
pos = avio_tell(ts->stream->pb);
1288
ts->pos47= pos % ts->raw_packet_size;
1290
if (tss->type == MPEGTS_SECTION) {
1292
/* pointer field present */
1294
if (p + len > p_end)
1297
/* write remaining section bytes */
1298
write_section_data(s, tss,
1300
/* check whether filter has been closed */
1306
write_section_data(s, tss,
1311
write_section_data(s, tss,
1317
// Note: The position here points actually behind the current packet.
1318
if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1319
pos - ts->raw_packet_size)) < 0)
1326
/* XXX: try to find a better synchro over several packets (use
1327
get_packet_size() ?) */
1328
static int mpegts_resync(AVFormatContext *s)
1330
AVIOContext *pb = s->pb;
1333
for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1335
if (pb->eof_reached)
1338
avio_seek(pb, -1, SEEK_CUR);
1342
av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1347
/* return -1 if error or EOF. Return 0 if OK. */
1348
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1350
AVIOContext *pb = s->pb;
1354
len = avio_read(pb, buf, TS_PACKET_SIZE);
1355
if (len != TS_PACKET_SIZE)
1356
return len < 0 ? len : AVERROR_EOF;
1357
/* check paquet sync byte */
1358
if (buf[0] != 0x47) {
1359
/* find a new packet start */
1360
avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1361
if (mpegts_resync(s) < 0)
1362
return AVERROR(EAGAIN);
1366
skip = raw_packet_size - TS_PACKET_SIZE;
1368
avio_skip(pb, skip);
1375
static int handle_packets(MpegTSContext *ts, int nb_packets)
1377
AVFormatContext *s = ts->stream;
1378
uint8_t packet[TS_PACKET_SIZE];
1379
int packet_num, ret;
1384
if (ts->stop_parse>0)
1387
if (nb_packets != 0 && packet_num >= nb_packets)
1389
ret = read_packet(s, packet, ts->raw_packet_size);
1392
ret = handle_packet(ts, packet);
1399
static int mpegts_probe(AVProbeData *p)
1402
const int size= p->buf_size;
1403
int score, fec_score, dvhs_score;
1404
int check_count= size / TS_FEC_PACKET_SIZE;
1405
#define CHECK_COUNT 10
1407
if (check_count < CHECK_COUNT)
1410
score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1411
dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1412
fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1413
// av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1415
// we need a clear definition for the returned score otherwise things will become messy sooner or later
1416
if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1417
else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1418
else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1421
/* only use the extension for safer guess */
1422
if (av_match_ext(p->filename, "ts"))
1423
return AVPROBE_SCORE_MAX;
1429
/* return the 90kHz PCR and the extension for the 27MHz PCR. return
1430
(-1) if not available */
1431
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1432
const uint8_t *packet)
1434
int afc, len, flags;
1438
afc = (packet[3] >> 4) & 3;
1448
if (!(flags & 0x10))
1453
*ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1454
*ppcr_low = ((p[4] & 1) << 8) | p[5];
1458
static int mpegts_read_header(AVFormatContext *s,
1459
AVFormatParameters *ap)
1461
MpegTSContext *ts = s->priv_data;
1462
AVIOContext *pb = s->pb;
1463
uint8_t buf[5*1024];
1467
#if FF_API_FORMAT_PARAMETERS
1469
if (ap->mpeg2ts_compute_pcr)
1470
ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1471
if(ap->mpeg2ts_raw){
1472
av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1478
/* read the first 1024 bytes to get packet size */
1479
pos = avio_tell(pb);
1480
len = avio_read(pb, buf, sizeof(buf));
1481
if (len != sizeof(buf))
1483
ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1484
if (ts->raw_packet_size <= 0)
1489
if (s->iformat == &ff_mpegts_demuxer) {
1492
/* first do a scaning to get all the services */
1493
if (avio_seek(pb, pos, SEEK_SET) < 0)
1494
av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1496
mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1498
mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1500
handle_packets(ts, s->probesize / ts->raw_packet_size);
1501
/* if could not find service, enable auto_guess */
1505
av_dlog(ts->stream, "tuning done\n");
1507
s->ctx_flags |= AVFMTCTX_NOHEADER;
1510
int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1511
int64_t pcrs[2], pcr_h;
1512
int packet_count[2];
1513
uint8_t packet[TS_PACKET_SIZE];
1515
/* only read packets */
1517
st = av_new_stream(s, 0);
1520
av_set_pts_info(st, 60, 1, 27000000);
1521
st->codec->codec_type = AVMEDIA_TYPE_DATA;
1522
st->codec->codec_id = CODEC_ID_MPEG2TS;
1524
/* we iterate until we find two PCRs to estimate the bitrate */
1529
ret = read_packet(s, packet, ts->raw_packet_size);
1532
pid = AV_RB16(packet + 1) & 0x1fff;
1533
if ((pcr_pid == -1 || pcr_pid == pid) &&
1534
parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1536
packet_count[nb_pcrs] = nb_packets;
1537
pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1545
/* NOTE1: the bitrate is computed without the FEC */
1546
/* NOTE2: it is only the bitrate of the start of the stream */
1547
ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1548
ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1549
s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1550
st->codec->bit_rate = s->bit_rate;
1551
st->start_time = ts->cur_pcr;
1552
av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1553
st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1556
avio_seek(pb, pos, SEEK_SET);
1562
#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1564
static int mpegts_raw_read_packet(AVFormatContext *s,
1567
MpegTSContext *ts = s->priv_data;
1569
int64_t pcr_h, next_pcr_h, pos;
1570
int pcr_l, next_pcr_l;
1571
uint8_t pcr_buf[12];
1573
if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1574
return AVERROR(ENOMEM);
1575
pkt->pos= avio_tell(s->pb);
1576
ret = read_packet(s, pkt->data, ts->raw_packet_size);
1578
av_free_packet(pkt);
1581
if (ts->mpeg2ts_compute_pcr) {
1582
/* compute exact PCR for each packet */
1583
if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1584
/* we read the next PCR (XXX: optimize it by using a bigger buffer */
1585
pos = avio_tell(s->pb);
1586
for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1587
avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1588
avio_read(s->pb, pcr_buf, 12);
1589
if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1590
/* XXX: not precise enough */
1591
ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1596
avio_seek(s->pb, pos, SEEK_SET);
1597
/* no next PCR found: we use previous increment */
1598
ts->cur_pcr = pcr_h * 300 + pcr_l;
1600
pkt->pts = ts->cur_pcr;
1601
pkt->duration = ts->pcr_incr;
1602
ts->cur_pcr += ts->pcr_incr;
1604
pkt->stream_index = 0;
1608
static int mpegts_read_packet(AVFormatContext *s,
1611
MpegTSContext *ts = s->priv_data;
1614
if (avio_tell(s->pb) != ts->last_pos) {
1615
/* seek detected, flush pes buffer */
1616
for (i = 0; i < NB_PID_MAX; i++) {
1617
if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1618
PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1619
av_freep(&pes->buffer);
1620
pes->data_index = 0;
1621
pes->state = MPEGTS_SKIP; /* skip until pes header */
1627
ret = handle_packets(ts, 0);
1629
/* flush pes data left */
1630
for (i = 0; i < NB_PID_MAX; i++) {
1631
if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1632
PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1633
if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1634
new_pes_packet(pes, pkt);
1635
pes->state = MPEGTS_SKIP;
1643
ts->last_pos = avio_tell(s->pb);
1648
static int mpegts_read_close(AVFormatContext *s)
1650
MpegTSContext *ts = s->priv_data;
1655
for(i=0;i<NB_PID_MAX;i++)
1656
if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1661
static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1662
int64_t *ppos, int64_t pos_limit)
1664
MpegTSContext *ts = s->priv_data;
1665
int64_t pos, timestamp;
1666
uint8_t buf[TS_PACKET_SIZE];
1667
int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1668
const int find_next= 1;
1669
pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1672
avio_seek(s->pb, pos, SEEK_SET);
1673
if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1674
return AV_NOPTS_VALUE;
1675
if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1676
parse_pcr(×tamp, &pcr_l, buf) == 0) {
1679
pos += ts->raw_packet_size;
1683
pos -= ts->raw_packet_size;
1685
return AV_NOPTS_VALUE;
1686
avio_seek(s->pb, pos, SEEK_SET);
1687
if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1688
return AV_NOPTS_VALUE;
1689
if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1690
parse_pcr(×tamp, &pcr_l, buf) == 0) {
1700
#ifdef USE_SYNCPOINT_SEARCH
1702
static int read_seek2(AVFormatContext *s,
1711
int64_t ts_ret, ts_adj;
1712
int stream_index_gen_search;
1714
AVParserState *backup;
1716
backup = ff_store_parser_state(s);
1718
// detect direction of seeking for search purposes
1719
flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
1720
AVSEEK_FLAG_BACKWARD : 0;
1722
if (flags & AVSEEK_FLAG_BYTE) {
1723
// use position directly, we will search starting from it
1726
// search for some position with good timestamp match
1727
if (stream_index < 0) {
1728
stream_index_gen_search = av_find_default_stream_index(s);
1729
if (stream_index_gen_search < 0) {
1730
ff_restore_parser_state(s, backup);
1734
st = s->streams[stream_index_gen_search];
1735
// timestamp for default must be expressed in AV_TIME_BASE units
1736
ts_adj = av_rescale(target_ts,
1738
AV_TIME_BASE * (int64_t)st->time_base.num);
1741
stream_index_gen_search = stream_index;
1743
pos = av_gen_search(s, stream_index_gen_search, ts_adj,
1747
flags, &ts_ret, mpegts_get_pcr);
1749
ff_restore_parser_state(s, backup);
1754
// search for actual matching keyframe/starting position for all streams
1755
if (ff_gen_syncpoint_search(s, stream_index, pos,
1756
min_ts, target_ts, max_ts,
1758
ff_restore_parser_state(s, backup);
1762
ff_free_parser_state(s, backup);
1766
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
1769
if (flags & AVSEEK_FLAG_BACKWARD) {
1770
flags &= ~AVSEEK_FLAG_BACKWARD;
1771
ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
1773
// for compatibility reasons, seek to the best-fitting timestamp
1774
ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1776
ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
1778
// for compatibility reasons, seek to the best-fitting timestamp
1779
ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
1786
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1787
MpegTSContext *ts = s->priv_data;
1788
uint8_t buf[TS_PACKET_SIZE];
1791
if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1794
pos= avio_tell(s->pb);
1797
avio_seek(s->pb, pos, SEEK_SET);
1798
if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1800
// pid = AV_RB16(buf + 1) & 0x1fff;
1801
if(buf[1] & 0x40) break;
1802
pos += ts->raw_packet_size;
1804
avio_seek(s->pb, pos, SEEK_SET);
1811
/**************************************************************/
1812
/* parsing functions - called from other demuxers such as RTP */
1814
MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
1818
ts = av_mallocz(sizeof(MpegTSContext));
1821
/* no stream case, currently used by RTP */
1822
ts->raw_packet_size = TS_PACKET_SIZE;
1828
/* return the consumed length if a packet was output, or -1 if no
1830
int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1831
const uint8_t *buf, int len)
1839
if (ts->stop_parse>0)
1841
if (len < TS_PACKET_SIZE)
1843
if (buf[0] != 0x47) {
1847
handle_packet(ts, buf);
1848
buf += TS_PACKET_SIZE;
1849
len -= TS_PACKET_SIZE;
1855
void ff_mpegts_parse_close(MpegTSContext *ts)
1859
for(i=0;i<NB_PID_MAX;i++)
1860
av_free(ts->pids[i]);
1864
AVInputFormat ff_mpegts_demuxer = {
1866
NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1867
sizeof(MpegTSContext),
1874
.flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1875
#ifdef USE_SYNCPOINT_SEARCH
1876
.read_seek2 = read_seek2,
1880
AVInputFormat ff_mpegtsraw_demuxer = {
1882
NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1883
sizeof(MpegTSContext),
1886
mpegts_raw_read_packet,
1890
.flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1891
#ifdef USE_SYNCPOINT_SEARCH
1892
.read_seek2 = read_seek2,
1894
.priv_class = &mpegtsraw_class,
added
removed
.pc/post-0.7.1/0017-mpegts-fix-Continuity-Counter-error-detection.patch/libavformat/mpegts.c
