mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
1773 lines
53 KiB
C
1773 lines
53 KiB
C
/*
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* MPEG2 transport stream (aka DVB) demuxer
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* Copyright (c) 2002-2003 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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*
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* FFmpeg 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; 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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*/
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//#define DEBUG
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//#define DEBUG_SEEK
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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 "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "mpegts.h"
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#include "internal.h"
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#include "seek.h"
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/* 1.0 second at 24Mbit/s */
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#define MAX_SCAN_PACKETS 32000
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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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MPEGTS_PES,
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MPEGTS_SECTION,
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};
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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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PESCallback *pes_cb;
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void *opaque;
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} 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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int section_index;
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int section_h_size;
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uint8_t *section_buf;
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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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void *opaque;
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} MpegTSSectionFilter;
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struct MpegTSFilter {
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int pid;
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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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union {
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MpegTSPESFilter pes_filter;
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MpegTSSectionFilter section_filter;
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} u;
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};
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#define MAX_PIDS_PER_PROGRAM 64
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struct Program {
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unsigned int id; //program id/service id
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unsigned int nb_pids;
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unsigned int pids[MAX_PIDS_PER_PROGRAM];
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};
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struct MpegTSContext {
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/* user data */
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AVFormatContext *stream;
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/** raw packet size, including FEC if present */
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int raw_packet_size;
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int pos47;
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/** if true, all pids are analyzed to find streams */
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int auto_guess;
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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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int stop_parse;
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/** packet containing Audio/Video data */
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AVPacket *pkt;
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/** to detect seek */
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int64_t last_pos;
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/******************************************/
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/* private mpegts data */
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/* scan context */
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/** structure to keep track of Program->pids mapping */
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unsigned int nb_prg;
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struct Program *prg;
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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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};
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/* TS stream handling */
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enum MpegTSState {
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MPEGTS_HEADER = 0,
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MPEGTS_PESHEADER,
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MPEGTS_PESHEADER_FILL,
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MPEGTS_PAYLOAD,
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MPEGTS_SKIP,
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};
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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 pid;
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int pcr_pid; /**< if -1 then all packets containing PCR are considered */
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int stream_type;
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MpegTSContext *ts;
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AVFormatContext *stream;
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AVStream *st;
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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 data_index;
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int total_size;
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int pes_header_size;
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int extended_stream_id;
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int64_t pts, dts;
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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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uint8_t *buffer;
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} PESContext;
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extern AVInputFormat mpegts_demuxer;
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static void clear_program(MpegTSContext *ts, unsigned int programid)
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{
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int i;
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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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}
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static void clear_programs(MpegTSContext *ts)
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{
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av_freep(&ts->prg);
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ts->nb_prg=0;
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}
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static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
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{
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struct Program *p;
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void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
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if(!tmp)
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return;
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ts->prg = tmp;
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p = &ts->prg[ts->nb_prg];
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p->id = programid;
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p->nb_pids = 0;
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ts->nb_prg++;
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}
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static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
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{
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int i;
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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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p = &ts->prg[i];
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break;
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}
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}
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if(!p)
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return;
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if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
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return;
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p->pids[p->nb_pids++] = pid;
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}
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/**
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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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* \param pid : - pid
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* \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
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* 0 otherwise
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*/
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static int discard_pid(MpegTSContext *ts, unsigned int pid)
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{
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int i, j, k;
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int used = 0, discarded = 0;
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struct Program *p;
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for(i=0; i<ts->nb_prg; i++) {
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p = &ts->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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continue;
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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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discarded++;
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else
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used++;
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}
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}
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}
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}
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return !used && discarded;
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}
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/**
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* Assembles PES packets out of TS packets, and then calls the "section_cb"
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* function when they are complete.
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*/
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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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{
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MpegTSSectionFilter *tss = &tss1->u.section_filter;
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int len;
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if (is_start) {
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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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} else {
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if (tss->end_of_section_reached)
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return;
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len = 4096 - tss->section_index;
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if (buf_size < len)
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len = buf_size;
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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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}
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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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if (len > 4096)
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return;
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tss->section_h_size = len;
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}
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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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}
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}
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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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int check_crc)
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{
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MpegTSFilter *filter;
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MpegTSSectionFilter *sec;
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dprintf(ts->stream, "Filter: pid=0x%x\n", pid);
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if (pid >= NB_PID_MAX || ts->pids[pid])
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return NULL;
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filter = av_mallocz(sizeof(MpegTSFilter));
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if (!filter)
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return NULL;
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ts->pids[pid] = filter;
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filter->type = MPEGTS_SECTION;
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filter->pid = pid;
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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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av_free(filter);
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return NULL;
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}
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return filter;
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}
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static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
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PESCallback *pes_cb,
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void *opaque)
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{
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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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return NULL;
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filter = av_mallocz(sizeof(MpegTSFilter));
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if (!filter)
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return NULL;
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ts->pids[pid] = filter;
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filter->type = MPEGTS_PES;
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filter->pid = pid;
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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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return filter;
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}
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static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
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{
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int pid;
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pid = filter->pid;
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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
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* av_close_input_stream */
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if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
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av_freep(&filter->u.pes_filter.opaque);
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}
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}
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av_free(filter);
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ts->pids[pid] = NULL;
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}
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static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
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int stat[TS_MAX_PACKET_SIZE];
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int i;
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int x=0;
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int best_score=0;
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memset(stat, 0, packet_size*sizeof(int));
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for(x=i=0; i<size-3; i++){
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if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
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stat[x]++;
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if(stat[x] > best_score){
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best_score= stat[x];
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if(index) *index= x;
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}
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}
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x++;
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if(x == packet_size) x= 0;
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}
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return best_score;
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}
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/* autodetect fec presence. Must have at least 1024 bytes */
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static int get_packet_size(const uint8_t *buf, int size)
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{
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int score, fec_score, dvhs_score;
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if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
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return -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);
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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;
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else return -1;
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}
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typedef struct SectionHeader {
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uint8_t tid;
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uint16_t id;
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uint8_t version;
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uint8_t sec_num;
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uint8_t last_sec_num;
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} SectionHeader;
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static inline int get8(const uint8_t **pp, const uint8_t *p_end)
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{
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const uint8_t *p;
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int c;
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p = *pp;
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if (p >= p_end)
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return -1;
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c = *p++;
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*pp = p;
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return c;
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}
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static inline int get16(const uint8_t **pp, const uint8_t *p_end)
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{
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const uint8_t *p;
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int c;
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p = *pp;
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if ((p + 1) >= p_end)
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return -1;
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c = AV_RB16(p);
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p += 2;
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*pp = p;
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return c;
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}
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/* read and allocate a DVB string preceeded by its length */
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static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
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{
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int len;
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const uint8_t *p;
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char *str;
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p = *pp;
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len = get8(&p, p_end);
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if (len < 0)
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return NULL;
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if ((p + len) > p_end)
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return NULL;
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str = av_malloc(len + 1);
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if (!str)
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return NULL;
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memcpy(str, p, len);
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str[len] = '\0';
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p += len;
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*pp = p;
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return str;
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}
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static int parse_section_header(SectionHeader *h,
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const uint8_t **pp, const uint8_t *p_end)
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{
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int val;
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val = get8(pp, p_end);
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if (val < 0)
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return -1;
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h->tid = val;
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*pp += 2;
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val = get16(pp, p_end);
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if (val < 0)
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return -1;
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h->id = val;
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val = get8(pp, p_end);
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if (val < 0)
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return -1;
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h->version = (val >> 1) & 0x1f;
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val = get8(pp, p_end);
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if (val < 0)
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return -1;
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h->sec_num = val;
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val = get8(pp, p_end);
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if (val < 0)
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return -1;
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h->last_sec_num = val;
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return 0;
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}
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typedef struct {
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uint32_t stream_type;
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enum CodecType codec_type;
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enum CodecID codec_id;
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} StreamType;
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static const StreamType ISO_types[] = {
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{ 0x01, CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
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{ 0x02, CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
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{ 0x03, CODEC_TYPE_AUDIO, CODEC_ID_MP3 },
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{ 0x04, CODEC_TYPE_AUDIO, CODEC_ID_MP3 },
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{ 0x0f, CODEC_TYPE_AUDIO, CODEC_ID_AAC },
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{ 0x10, CODEC_TYPE_VIDEO, CODEC_ID_MPEG4 },
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{ 0x11, CODEC_TYPE_AUDIO, CODEC_ID_AAC }, /* LATM syntax */
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{ 0x1b, CODEC_TYPE_VIDEO, CODEC_ID_H264 },
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{ 0xd1, CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
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{ 0xea, CODEC_TYPE_VIDEO, CODEC_ID_VC1 },
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{ 0 },
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};
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static const StreamType HDMV_types[] = {
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{ 0x80, CODEC_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
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{ 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
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{ 0x82, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
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{ 0x83, CODEC_TYPE_AUDIO, CODEC_ID_TRUEHD },
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{ 0x84, CODEC_TYPE_AUDIO, CODEC_ID_EAC3 },
|
|
{ 0x90, CODEC_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
|
|
{ 0 },
|
|
};
|
|
|
|
/* ATSC ? */
|
|
static const StreamType MISC_types[] = {
|
|
{ 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
|
|
{ 0x8a, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
|
|
{ 0 },
|
|
};
|
|
|
|
static const StreamType REGD_types[] = {
|
|
{ MKTAG('d','r','a','c'), CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
|
|
{ MKTAG('A','C','-','3'), CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
|
|
{ 0 },
|
|
};
|
|
|
|
/* descriptor present */
|
|
static const StreamType DESC_types[] = {
|
|
{ 0x6a, CODEC_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
|
|
{ 0x7a, CODEC_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
|
|
{ 0x7b, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
|
|
{ 0x56, CODEC_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
|
|
{ 0x59, CODEC_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
|
|
{ 0 },
|
|
};
|
|
|
|
static void mpegts_find_stream_type(AVStream *st,
|
|
uint32_t stream_type, const StreamType *types)
|
|
{
|
|
for (; types->stream_type; types++) {
|
|
if (stream_type == types->stream_type) {
|
|
st->codec->codec_type = types->codec_type;
|
|
st->codec->codec_id = types->codec_id;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
|
|
uint32_t stream_type, uint32_t prog_reg_desc)
|
|
{
|
|
av_set_pts_info(st, 33, 1, 90000);
|
|
st->priv_data = pes;
|
|
st->codec->codec_type = CODEC_TYPE_DATA;
|
|
st->codec->codec_id = CODEC_ID_NONE;
|
|
st->need_parsing = AVSTREAM_PARSE_FULL;
|
|
pes->st = st;
|
|
pes->stream_type = stream_type;
|
|
|
|
av_log(pes->stream, AV_LOG_DEBUG,
|
|
"stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
|
|
st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
|
|
|
|
st->codec->codec_tag = pes->stream_type;
|
|
|
|
mpegts_find_stream_type(st, pes->stream_type, ISO_types);
|
|
if (prog_reg_desc == AV_RL32("HDMV") &&
|
|
st->codec->codec_id == CODEC_ID_NONE) {
|
|
mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
|
|
if (pes->stream_type == 0x83) {
|
|
// HDMV TrueHD streams also contain an AC3 coded version of the
|
|
// audio track - add a second stream for this
|
|
AVStream *sub_st;
|
|
// priv_data cannot be shared between streams
|
|
PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
|
|
if (!sub_pes)
|
|
return AVERROR(ENOMEM);
|
|
memcpy(sub_pes, pes, sizeof(*sub_pes));
|
|
|
|
sub_st = av_new_stream(pes->stream, pes->pid);
|
|
if (!sub_st) {
|
|
av_free(sub_pes);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
av_set_pts_info(sub_st, 33, 1, 90000);
|
|
sub_st->priv_data = sub_pes;
|
|
sub_st->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
sub_st->codec->codec_id = CODEC_ID_AC3;
|
|
sub_st->need_parsing = AVSTREAM_PARSE_FULL;
|
|
sub_pes->sub_st = pes->sub_st = sub_st;
|
|
}
|
|
}
|
|
if (st->codec->codec_id == CODEC_ID_NONE)
|
|
mpegts_find_stream_type(st, pes->stream_type, MISC_types);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int64_t get_pts(const uint8_t *p)
|
|
{
|
|
int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
|
|
pts |= (AV_RB16(p + 1) >> 1) << 15;
|
|
pts |= AV_RB16(p + 3) >> 1;
|
|
return pts;
|
|
}
|
|
|
|
static void new_pes_packet(PESContext *pes, AVPacket *pkt)
|
|
{
|
|
av_init_packet(pkt);
|
|
|
|
pkt->destruct = av_destruct_packet;
|
|
pkt->data = pes->buffer;
|
|
pkt->size = pes->data_index;
|
|
memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
|
|
|
|
// Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
|
|
if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
|
|
pkt->stream_index = pes->sub_st->index;
|
|
else
|
|
pkt->stream_index = pes->st->index;
|
|
pkt->pts = pes->pts;
|
|
pkt->dts = pes->dts;
|
|
/* store position of first TS packet of this PES packet */
|
|
pkt->pos = pes->ts_packet_pos;
|
|
|
|
/* reset pts values */
|
|
pes->pts = AV_NOPTS_VALUE;
|
|
pes->dts = AV_NOPTS_VALUE;
|
|
pes->buffer = NULL;
|
|
pes->data_index = 0;
|
|
}
|
|
|
|
/* return non zero if a packet could be constructed */
|
|
static int mpegts_push_data(MpegTSFilter *filter,
|
|
const uint8_t *buf, int buf_size, int is_start,
|
|
int64_t pos)
|
|
{
|
|
PESContext *pes = filter->u.pes_filter.opaque;
|
|
MpegTSContext *ts = pes->ts;
|
|
const uint8_t *p;
|
|
int len, code;
|
|
|
|
if(!ts->pkt)
|
|
return 0;
|
|
|
|
if (is_start) {
|
|
if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
|
|
new_pes_packet(pes, ts->pkt);
|
|
ts->stop_parse = 1;
|
|
}
|
|
pes->state = MPEGTS_HEADER;
|
|
pes->data_index = 0;
|
|
pes->ts_packet_pos = pos;
|
|
}
|
|
p = buf;
|
|
while (buf_size > 0) {
|
|
switch(pes->state) {
|
|
case MPEGTS_HEADER:
|
|
len = PES_START_SIZE - pes->data_index;
|
|
if (len > buf_size)
|
|
len = buf_size;
|
|
memcpy(pes->header + pes->data_index, p, len);
|
|
pes->data_index += len;
|
|
p += len;
|
|
buf_size -= len;
|
|
if (pes->data_index == PES_START_SIZE) {
|
|
/* we got all the PES or section header. We can now
|
|
decide */
|
|
#if 0
|
|
av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
|
|
#endif
|
|
if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
|
|
pes->header[2] == 0x01) {
|
|
/* it must be an mpeg2 PES stream */
|
|
code = pes->header[3] | 0x100;
|
|
dprintf(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
|
|
|
|
if ((!pes->st && pes->stream->nb_streams == MAX_STREAMS) ||
|
|
(pes->st && pes->st->discard == AVDISCARD_ALL) ||
|
|
code == 0x1be) /* padding_stream */
|
|
goto skip;
|
|
|
|
/* stream not present in PMT */
|
|
if (!pes->st) {
|
|
pes->st = av_new_stream(ts->stream, pes->pid);
|
|
if (!pes->st)
|
|
return AVERROR(ENOMEM);
|
|
mpegts_set_stream_info(pes->st, pes, 0, 0);
|
|
}
|
|
|
|
pes->total_size = AV_RB16(pes->header + 4);
|
|
/* NOTE: a zero total size means the PES size is
|
|
unbounded */
|
|
if (!pes->total_size)
|
|
pes->total_size = MAX_PES_PAYLOAD;
|
|
|
|
/* allocate pes buffer */
|
|
pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!pes->buffer)
|
|
return AVERROR(ENOMEM);
|
|
|
|
if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
|
|
code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
|
|
code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
|
|
code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
|
|
pes->state = MPEGTS_PESHEADER;
|
|
if (pes->st->codec->codec_id == CODEC_ID_NONE) {
|
|
dprintf(pes->stream, "pid=%x stream_type=%x probing\n",
|
|
pes->pid, pes->stream_type);
|
|
pes->st->codec->codec_id = CODEC_ID_PROBE;
|
|
}
|
|
} else {
|
|
pes->state = MPEGTS_PAYLOAD;
|
|
pes->data_index = 0;
|
|
}
|
|
} else {
|
|
/* otherwise, it should be a table */
|
|
/* skip packet */
|
|
skip:
|
|
pes->state = MPEGTS_SKIP;
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
/**********************************************/
|
|
/* PES packing parsing */
|
|
case MPEGTS_PESHEADER:
|
|
len = PES_HEADER_SIZE - pes->data_index;
|
|
if (len < 0)
|
|
return -1;
|
|
if (len > buf_size)
|
|
len = buf_size;
|
|
memcpy(pes->header + pes->data_index, p, len);
|
|
pes->data_index += len;
|
|
p += len;
|
|
buf_size -= len;
|
|
if (pes->data_index == PES_HEADER_SIZE) {
|
|
pes->pes_header_size = pes->header[8] + 9;
|
|
pes->state = MPEGTS_PESHEADER_FILL;
|
|
}
|
|
break;
|
|
case MPEGTS_PESHEADER_FILL:
|
|
len = pes->pes_header_size - pes->data_index;
|
|
if (len < 0)
|
|
return -1;
|
|
if (len > buf_size)
|
|
len = buf_size;
|
|
memcpy(pes->header + pes->data_index, p, len);
|
|
pes->data_index += len;
|
|
p += len;
|
|
buf_size -= len;
|
|
if (pes->data_index == pes->pes_header_size) {
|
|
const uint8_t *r;
|
|
unsigned int flags, pes_ext, skip;
|
|
|
|
flags = pes->header[7];
|
|
r = pes->header + 9;
|
|
pes->pts = AV_NOPTS_VALUE;
|
|
pes->dts = AV_NOPTS_VALUE;
|
|
if ((flags & 0xc0) == 0x80) {
|
|
pes->dts = pes->pts = get_pts(r);
|
|
r += 5;
|
|
} else if ((flags & 0xc0) == 0xc0) {
|
|
pes->pts = get_pts(r);
|
|
r += 5;
|
|
pes->dts = get_pts(r);
|
|
r += 5;
|
|
}
|
|
pes->extended_stream_id = -1;
|
|
if (flags & 0x01) { /* PES extension */
|
|
pes_ext = *r++;
|
|
/* Skip PES private data, program packet sequence counter and P-STD buffer */
|
|
skip = (pes_ext >> 4) & 0xb;
|
|
skip += skip & 0x9;
|
|
r += skip;
|
|
if ((pes_ext & 0x41) == 0x01 &&
|
|
(r + 2) <= (pes->header + pes->pes_header_size)) {
|
|
/* PES extension 2 */
|
|
if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
|
|
pes->extended_stream_id = r[1];
|
|
}
|
|
}
|
|
|
|
/* we got the full header. We parse it and get the payload */
|
|
pes->state = MPEGTS_PAYLOAD;
|
|
pes->data_index = 0;
|
|
}
|
|
break;
|
|
case MPEGTS_PAYLOAD:
|
|
if (buf_size > 0 && pes->buffer) {
|
|
if (pes->data_index+buf_size > pes->total_size) {
|
|
new_pes_packet(pes, ts->pkt);
|
|
pes->total_size = MAX_PES_PAYLOAD;
|
|
pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!pes->buffer)
|
|
return AVERROR(ENOMEM);
|
|
ts->stop_parse = 1;
|
|
}
|
|
memcpy(pes->buffer+pes->data_index, p, buf_size);
|
|
pes->data_index += buf_size;
|
|
}
|
|
buf_size = 0;
|
|
break;
|
|
case MPEGTS_SKIP:
|
|
buf_size = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
|
|
{
|
|
MpegTSFilter *tss;
|
|
PESContext *pes;
|
|
|
|
/* if no pid found, then add a pid context */
|
|
pes = av_mallocz(sizeof(PESContext));
|
|
if (!pes)
|
|
return 0;
|
|
pes->ts = ts;
|
|
pes->stream = ts->stream;
|
|
pes->pid = pid;
|
|
pes->pcr_pid = pcr_pid;
|
|
pes->state = MPEGTS_SKIP;
|
|
pes->pts = AV_NOPTS_VALUE;
|
|
pes->dts = AV_NOPTS_VALUE;
|
|
tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
|
|
if (!tss) {
|
|
av_free(pes);
|
|
return 0;
|
|
}
|
|
return pes;
|
|
}
|
|
|
|
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
|
|
{
|
|
MpegTSContext *ts = filter->u.section_filter.opaque;
|
|
SectionHeader h1, *h = &h1;
|
|
PESContext *pes;
|
|
AVStream *st;
|
|
const uint8_t *p, *p_end, *desc_list_end, *desc_end;
|
|
int program_info_length, pcr_pid, pid, stream_type;
|
|
int desc_list_len, desc_len, desc_tag;
|
|
int comp_page, anc_page;
|
|
char language[4];
|
|
uint32_t prog_reg_desc = 0; /* registration descriptor */
|
|
|
|
#ifdef DEBUG
|
|
dprintf(ts->stream, "PMT: len %i\n", section_len);
|
|
av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
|
|
#endif
|
|
|
|
p_end = section + section_len - 4;
|
|
p = section;
|
|
if (parse_section_header(h, &p, p_end) < 0)
|
|
return;
|
|
|
|
dprintf(ts->stream, "sid=0x%x sec_num=%d/%d\n",
|
|
h->id, h->sec_num, h->last_sec_num);
|
|
|
|
if (h->tid != PMT_TID)
|
|
return;
|
|
|
|
clear_program(ts, h->id);
|
|
pcr_pid = get16(&p, p_end) & 0x1fff;
|
|
if (pcr_pid < 0)
|
|
return;
|
|
add_pid_to_pmt(ts, h->id, pcr_pid);
|
|
|
|
dprintf(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
|
|
|
|
program_info_length = get16(&p, p_end) & 0xfff;
|
|
if (program_info_length < 0)
|
|
return;
|
|
while(program_info_length >= 2) {
|
|
uint8_t tag, len;
|
|
tag = get8(&p, p_end);
|
|
len = get8(&p, p_end);
|
|
if(len > program_info_length - 2)
|
|
//something else is broken, exit the program_descriptors_loop
|
|
break;
|
|
program_info_length -= len + 2;
|
|
if(tag == 0x05 && len >= 4) { // registration descriptor
|
|
prog_reg_desc = bytestream_get_le32(&p);
|
|
len -= 4;
|
|
}
|
|
p += len;
|
|
}
|
|
p += program_info_length;
|
|
if (p >= p_end)
|
|
return;
|
|
|
|
// stop parsing after pmt, we found header
|
|
if (!ts->stream->nb_streams)
|
|
ts->stop_parse = 1;
|
|
|
|
for(;;) {
|
|
st = 0;
|
|
stream_type = get8(&p, p_end);
|
|
if (stream_type < 0)
|
|
break;
|
|
pid = get16(&p, p_end) & 0x1fff;
|
|
if (pid < 0)
|
|
break;
|
|
|
|
/* now create ffmpeg stream */
|
|
if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
|
|
pes = ts->pids[pid]->u.pes_filter.opaque;
|
|
st = pes->st;
|
|
} else {
|
|
if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
|
|
pes = add_pes_stream(ts, pid, pcr_pid);
|
|
if (pes)
|
|
st = av_new_stream(pes->stream, pes->pid);
|
|
}
|
|
|
|
if (!st)
|
|
return;
|
|
|
|
if (!pes->stream_type)
|
|
mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
|
|
|
|
add_pid_to_pmt(ts, h->id, pid);
|
|
|
|
av_program_add_stream_index(ts->stream, h->id, st->index);
|
|
|
|
desc_list_len = get16(&p, p_end) & 0xfff;
|
|
if (desc_list_len < 0)
|
|
break;
|
|
desc_list_end = p + desc_list_len;
|
|
if (desc_list_end > p_end)
|
|
break;
|
|
for(;;) {
|
|
desc_tag = get8(&p, desc_list_end);
|
|
if (desc_tag < 0)
|
|
break;
|
|
desc_len = get8(&p, desc_list_end);
|
|
if (desc_len < 0)
|
|
break;
|
|
desc_end = p + desc_len;
|
|
if (desc_end > desc_list_end)
|
|
break;
|
|
|
|
dprintf(ts->stream, "tag: 0x%02x len=%d\n",
|
|
desc_tag, desc_len);
|
|
|
|
if (st->codec->codec_id == CODEC_ID_NONE &&
|
|
stream_type == STREAM_TYPE_PRIVATE_DATA)
|
|
mpegts_find_stream_type(st, desc_tag, DESC_types);
|
|
|
|
switch(desc_tag) {
|
|
case 0x56: /* DVB teletext descriptor */
|
|
language[0] = get8(&p, desc_end);
|
|
language[1] = get8(&p, desc_end);
|
|
language[2] = get8(&p, desc_end);
|
|
language[3] = 0;
|
|
av_metadata_set(&st->metadata, "language", language);
|
|
break;
|
|
case 0x59: /* subtitling descriptor */
|
|
language[0] = get8(&p, desc_end);
|
|
language[1] = get8(&p, desc_end);
|
|
language[2] = get8(&p, desc_end);
|
|
language[3] = 0;
|
|
get8(&p, desc_end);
|
|
comp_page = get16(&p, desc_end);
|
|
anc_page = get16(&p, desc_end);
|
|
st->codec->sub_id = (anc_page << 16) | comp_page;
|
|
av_metadata_set(&st->metadata, "language", language);
|
|
break;
|
|
case 0x0a: /* ISO 639 language descriptor */
|
|
language[0] = get8(&p, desc_end);
|
|
language[1] = get8(&p, desc_end);
|
|
language[2] = get8(&p, desc_end);
|
|
language[3] = 0;
|
|
av_metadata_set(&st->metadata, "language", language);
|
|
break;
|
|
case 0x05: /* registration descriptor */
|
|
st->codec->codec_tag = bytestream_get_le32(&p);
|
|
dprintf(ts->stream, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
|
|
if (st->codec->codec_id == CODEC_ID_NONE &&
|
|
stream_type == STREAM_TYPE_PRIVATE_DATA)
|
|
mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
p = desc_end;
|
|
|
|
if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
|
|
av_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
|
|
pes->sub_st->codec->codec_tag = st->codec->codec_tag;
|
|
}
|
|
}
|
|
p = desc_list_end;
|
|
}
|
|
/* all parameters are there */
|
|
mpegts_close_filter(ts, filter);
|
|
}
|
|
|
|
static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
|
|
{
|
|
MpegTSContext *ts = filter->u.section_filter.opaque;
|
|
SectionHeader h1, *h = &h1;
|
|
const uint8_t *p, *p_end;
|
|
int sid, pmt_pid;
|
|
|
|
#ifdef DEBUG
|
|
dprintf(ts->stream, "PAT:\n");
|
|
av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
|
|
#endif
|
|
p_end = section + section_len - 4;
|
|
p = section;
|
|
if (parse_section_header(h, &p, p_end) < 0)
|
|
return;
|
|
if (h->tid != PAT_TID)
|
|
return;
|
|
|
|
clear_programs(ts);
|
|
for(;;) {
|
|
sid = get16(&p, p_end);
|
|
if (sid < 0)
|
|
break;
|
|
pmt_pid = get16(&p, p_end) & 0x1fff;
|
|
if (pmt_pid < 0)
|
|
break;
|
|
|
|
dprintf(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
|
|
|
|
if (sid == 0x0000) {
|
|
/* NIT info */
|
|
} else {
|
|
av_new_program(ts->stream, sid);
|
|
mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
|
|
add_pat_entry(ts, sid);
|
|
add_pid_to_pmt(ts, sid, 0); //add pat pid to program
|
|
add_pid_to_pmt(ts, sid, pmt_pid);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
|
|
{
|
|
MpegTSContext *ts = filter->u.section_filter.opaque;
|
|
SectionHeader h1, *h = &h1;
|
|
const uint8_t *p, *p_end, *desc_list_end, *desc_end;
|
|
int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
|
|
char *name, *provider_name;
|
|
|
|
#ifdef DEBUG
|
|
dprintf(ts->stream, "SDT:\n");
|
|
av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
|
|
#endif
|
|
|
|
p_end = section + section_len - 4;
|
|
p = section;
|
|
if (parse_section_header(h, &p, p_end) < 0)
|
|
return;
|
|
if (h->tid != SDT_TID)
|
|
return;
|
|
onid = get16(&p, p_end);
|
|
if (onid < 0)
|
|
return;
|
|
val = get8(&p, p_end);
|
|
if (val < 0)
|
|
return;
|
|
for(;;) {
|
|
sid = get16(&p, p_end);
|
|
if (sid < 0)
|
|
break;
|
|
val = get8(&p, p_end);
|
|
if (val < 0)
|
|
break;
|
|
desc_list_len = get16(&p, p_end) & 0xfff;
|
|
if (desc_list_len < 0)
|
|
break;
|
|
desc_list_end = p + desc_list_len;
|
|
if (desc_list_end > p_end)
|
|
break;
|
|
for(;;) {
|
|
desc_tag = get8(&p, desc_list_end);
|
|
if (desc_tag < 0)
|
|
break;
|
|
desc_len = get8(&p, desc_list_end);
|
|
desc_end = p + desc_len;
|
|
if (desc_end > desc_list_end)
|
|
break;
|
|
|
|
dprintf(ts->stream, "tag: 0x%02x len=%d\n",
|
|
desc_tag, desc_len);
|
|
|
|
switch(desc_tag) {
|
|
case 0x48:
|
|
service_type = get8(&p, p_end);
|
|
if (service_type < 0)
|
|
break;
|
|
provider_name = getstr8(&p, p_end);
|
|
if (!provider_name)
|
|
break;
|
|
name = getstr8(&p, p_end);
|
|
if (name) {
|
|
AVProgram *program = av_new_program(ts->stream, sid);
|
|
if(program) {
|
|
av_metadata_set(&program->metadata, "name", name);
|
|
av_metadata_set(&program->metadata, "provider_name", provider_name);
|
|
}
|
|
}
|
|
av_free(name);
|
|
av_free(provider_name);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
p = desc_end;
|
|
}
|
|
p = desc_list_end;
|
|
}
|
|
}
|
|
|
|
/* handle one TS packet */
|
|
static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
|
|
{
|
|
AVFormatContext *s = ts->stream;
|
|
MpegTSFilter *tss;
|
|
int len, pid, cc, cc_ok, afc, is_start;
|
|
const uint8_t *p, *p_end;
|
|
int64_t pos;
|
|
|
|
pid = AV_RB16(packet + 1) & 0x1fff;
|
|
if(pid && discard_pid(ts, pid))
|
|
return 0;
|
|
is_start = packet[1] & 0x40;
|
|
tss = ts->pids[pid];
|
|
if (ts->auto_guess && tss == NULL && is_start) {
|
|
add_pes_stream(ts, pid, -1);
|
|
tss = ts->pids[pid];
|
|
}
|
|
if (!tss)
|
|
return 0;
|
|
|
|
/* continuity check (currently not used) */
|
|
cc = (packet[3] & 0xf);
|
|
cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
|
|
tss->last_cc = cc;
|
|
|
|
/* skip adaptation field */
|
|
afc = (packet[3] >> 4) & 3;
|
|
p = packet + 4;
|
|
if (afc == 0) /* reserved value */
|
|
return 0;
|
|
if (afc == 2) /* adaptation field only */
|
|
return 0;
|
|
if (afc == 3) {
|
|
/* skip adapation field */
|
|
p += p[0] + 1;
|
|
}
|
|
/* if past the end of packet, ignore */
|
|
p_end = packet + TS_PACKET_SIZE;
|
|
if (p >= p_end)
|
|
return 0;
|
|
|
|
pos = url_ftell(ts->stream->pb);
|
|
ts->pos47= pos % ts->raw_packet_size;
|
|
|
|
if (tss->type == MPEGTS_SECTION) {
|
|
if (is_start) {
|
|
/* pointer field present */
|
|
len = *p++;
|
|
if (p + len > p_end)
|
|
return 0;
|
|
if (len && cc_ok) {
|
|
/* write remaining section bytes */
|
|
write_section_data(s, tss,
|
|
p, len, 0);
|
|
/* check whether filter has been closed */
|
|
if (!ts->pids[pid])
|
|
return 0;
|
|
}
|
|
p += len;
|
|
if (p < p_end) {
|
|
write_section_data(s, tss,
|
|
p, p_end - p, 1);
|
|
}
|
|
} else {
|
|
if (cc_ok) {
|
|
write_section_data(s, tss,
|
|
p, p_end - p, 0);
|
|
}
|
|
}
|
|
} else {
|
|
int ret;
|
|
// Note: The position here points actually behind the current packet.
|
|
if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
|
|
pos - ts->raw_packet_size)) < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* XXX: try to find a better synchro over several packets (use
|
|
get_packet_size() ?) */
|
|
static int mpegts_resync(AVFormatContext *s)
|
|
{
|
|
ByteIOContext *pb = s->pb;
|
|
int c, i;
|
|
|
|
for(i = 0;i < MAX_RESYNC_SIZE; i++) {
|
|
c = url_fgetc(pb);
|
|
if (c < 0)
|
|
return -1;
|
|
if (c == 0x47) {
|
|
url_fseek(pb, -1, SEEK_CUR);
|
|
return 0;
|
|
}
|
|
}
|
|
av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
|
|
/* no sync found */
|
|
return -1;
|
|
}
|
|
|
|
/* return -1 if error or EOF. Return 0 if OK. */
|
|
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
|
|
{
|
|
ByteIOContext *pb = s->pb;
|
|
int skip, len;
|
|
|
|
for(;;) {
|
|
len = get_buffer(pb, buf, TS_PACKET_SIZE);
|
|
if (len != TS_PACKET_SIZE)
|
|
return AVERROR(EIO);
|
|
/* check paquet sync byte */
|
|
if (buf[0] != 0x47) {
|
|
/* find a new packet start */
|
|
url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
|
|
if (mpegts_resync(s) < 0)
|
|
return AVERROR(EAGAIN);
|
|
else
|
|
continue;
|
|
} else {
|
|
skip = raw_packet_size - TS_PACKET_SIZE;
|
|
if (skip > 0)
|
|
url_fskip(pb, skip);
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int handle_packets(MpegTSContext *ts, int nb_packets)
|
|
{
|
|
AVFormatContext *s = ts->stream;
|
|
uint8_t packet[TS_PACKET_SIZE];
|
|
int packet_num, ret;
|
|
|
|
ts->stop_parse = 0;
|
|
packet_num = 0;
|
|
for(;;) {
|
|
if (ts->stop_parse>0)
|
|
break;
|
|
packet_num++;
|
|
if (nb_packets != 0 && packet_num >= nb_packets)
|
|
break;
|
|
ret = read_packet(s, packet, ts->raw_packet_size);
|
|
if (ret != 0)
|
|
return ret;
|
|
ret = handle_packet(ts, packet);
|
|
if (ret != 0)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int mpegts_probe(AVProbeData *p)
|
|
{
|
|
#if 1
|
|
const int size= p->buf_size;
|
|
int score, fec_score, dvhs_score;
|
|
int check_count= size / TS_FEC_PACKET_SIZE;
|
|
#define CHECK_COUNT 10
|
|
|
|
if (check_count < CHECK_COUNT)
|
|
return -1;
|
|
|
|
score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
|
|
dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
|
|
fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
|
|
// av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
|
|
|
|
// we need a clear definition for the returned score otherwise things will become messy sooner or later
|
|
if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
|
|
else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
|
|
else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
|
|
else return -1;
|
|
#else
|
|
/* only use the extension for safer guess */
|
|
if (match_ext(p->filename, "ts"))
|
|
return AVPROBE_SCORE_MAX;
|
|
else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/* return the 90kHz PCR and the extension for the 27MHz PCR. return
|
|
(-1) if not available */
|
|
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
|
|
const uint8_t *packet)
|
|
{
|
|
int afc, len, flags;
|
|
const uint8_t *p;
|
|
unsigned int v;
|
|
|
|
afc = (packet[3] >> 4) & 3;
|
|
if (afc <= 1)
|
|
return -1;
|
|
p = packet + 4;
|
|
len = p[0];
|
|
p++;
|
|
if (len == 0)
|
|
return -1;
|
|
flags = *p++;
|
|
len--;
|
|
if (!(flags & 0x10))
|
|
return -1;
|
|
if (len < 6)
|
|
return -1;
|
|
v = AV_RB32(p);
|
|
*ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
|
|
*ppcr_low = ((p[4] & 1) << 8) | p[5];
|
|
return 0;
|
|
}
|
|
|
|
static int mpegts_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
MpegTSContext *ts = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
uint8_t buf[5*1024];
|
|
int len;
|
|
int64_t pos;
|
|
|
|
if (ap) {
|
|
ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
|
|
if(ap->mpeg2ts_raw){
|
|
av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* read the first 1024 bytes to get packet size */
|
|
pos = url_ftell(pb);
|
|
len = get_buffer(pb, buf, sizeof(buf));
|
|
if (len != sizeof(buf))
|
|
goto fail;
|
|
ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
|
|
if (ts->raw_packet_size <= 0)
|
|
goto fail;
|
|
ts->stream = s;
|
|
ts->auto_guess = 0;
|
|
|
|
if (s->iformat == &mpegts_demuxer) {
|
|
/* normal demux */
|
|
|
|
/* first do a scaning to get all the services */
|
|
url_fseek(pb, pos, SEEK_SET);
|
|
|
|
mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
|
|
|
|
mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
|
|
|
|
handle_packets(ts, s->probesize / ts->raw_packet_size);
|
|
/* if could not find service, enable auto_guess */
|
|
|
|
ts->auto_guess = 1;
|
|
|
|
dprintf(ts->stream, "tuning done\n");
|
|
|
|
s->ctx_flags |= AVFMTCTX_NOHEADER;
|
|
} else {
|
|
AVStream *st;
|
|
int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
|
|
int64_t pcrs[2], pcr_h;
|
|
int packet_count[2];
|
|
uint8_t packet[TS_PACKET_SIZE];
|
|
|
|
/* only read packets */
|
|
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
goto fail;
|
|
av_set_pts_info(st, 60, 1, 27000000);
|
|
st->codec->codec_type = CODEC_TYPE_DATA;
|
|
st->codec->codec_id = CODEC_ID_MPEG2TS;
|
|
|
|
/* we iterate until we find two PCRs to estimate the bitrate */
|
|
pcr_pid = -1;
|
|
nb_pcrs = 0;
|
|
nb_packets = 0;
|
|
for(;;) {
|
|
ret = read_packet(s, packet, ts->raw_packet_size);
|
|
if (ret < 0)
|
|
return -1;
|
|
pid = AV_RB16(packet + 1) & 0x1fff;
|
|
if ((pcr_pid == -1 || pcr_pid == pid) &&
|
|
parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
|
|
pcr_pid = pid;
|
|
packet_count[nb_pcrs] = nb_packets;
|
|
pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
|
|
nb_pcrs++;
|
|
if (nb_pcrs >= 2)
|
|
break;
|
|
}
|
|
nb_packets++;
|
|
}
|
|
|
|
/* NOTE1: the bitrate is computed without the FEC */
|
|
/* NOTE2: it is only the bitrate of the start of the stream */
|
|
ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
|
|
ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
|
|
s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
|
|
st->codec->bit_rate = s->bit_rate;
|
|
st->start_time = ts->cur_pcr;
|
|
#if 0
|
|
av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
|
|
st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
|
|
#endif
|
|
}
|
|
|
|
url_fseek(pb, pos, SEEK_SET);
|
|
return 0;
|
|
fail:
|
|
return -1;
|
|
}
|
|
|
|
#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
|
|
|
|
static int mpegts_raw_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
MpegTSContext *ts = s->priv_data;
|
|
int ret, i;
|
|
int64_t pcr_h, next_pcr_h, pos;
|
|
int pcr_l, next_pcr_l;
|
|
uint8_t pcr_buf[12];
|
|
|
|
if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
|
|
return AVERROR(ENOMEM);
|
|
pkt->pos= url_ftell(s->pb);
|
|
ret = read_packet(s, pkt->data, ts->raw_packet_size);
|
|
if (ret < 0) {
|
|
av_free_packet(pkt);
|
|
return ret;
|
|
}
|
|
if (ts->mpeg2ts_compute_pcr) {
|
|
/* compute exact PCR for each packet */
|
|
if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
|
|
/* we read the next PCR (XXX: optimize it by using a bigger buffer */
|
|
pos = url_ftell(s->pb);
|
|
for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
|
|
url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
|
|
get_buffer(s->pb, pcr_buf, 12);
|
|
if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
|
|
/* XXX: not precise enough */
|
|
ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
|
|
(i + 1);
|
|
break;
|
|
}
|
|
}
|
|
url_fseek(s->pb, pos, SEEK_SET);
|
|
/* no next PCR found: we use previous increment */
|
|
ts->cur_pcr = pcr_h * 300 + pcr_l;
|
|
}
|
|
pkt->pts = ts->cur_pcr;
|
|
pkt->duration = ts->pcr_incr;
|
|
ts->cur_pcr += ts->pcr_incr;
|
|
}
|
|
pkt->stream_index = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int mpegts_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
MpegTSContext *ts = s->priv_data;
|
|
int ret, i;
|
|
|
|
if (url_ftell(s->pb) != ts->last_pos) {
|
|
/* seek detected, flush pes buffer */
|
|
for (i = 0; i < NB_PID_MAX; i++) {
|
|
if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
|
|
PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
|
|
av_freep(&pes->buffer);
|
|
pes->data_index = 0;
|
|
pes->state = MPEGTS_SKIP; /* skip until pes header */
|
|
}
|
|
}
|
|
}
|
|
|
|
ts->pkt = pkt;
|
|
ret = handle_packets(ts, 0);
|
|
if (ret < 0) {
|
|
/* flush pes data left */
|
|
for (i = 0; i < NB_PID_MAX; i++) {
|
|
if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
|
|
PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
|
|
if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
|
|
new_pes_packet(pes, pkt);
|
|
pes->state = MPEGTS_SKIP;
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ts->last_pos = url_ftell(s->pb);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mpegts_read_close(AVFormatContext *s)
|
|
{
|
|
MpegTSContext *ts = s->priv_data;
|
|
int i;
|
|
|
|
clear_programs(ts);
|
|
|
|
for(i=0;i<NB_PID_MAX;i++)
|
|
if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
|
|
int64_t *ppos, int64_t pos_limit)
|
|
{
|
|
MpegTSContext *ts = s->priv_data;
|
|
int64_t pos, timestamp;
|
|
uint8_t buf[TS_PACKET_SIZE];
|
|
int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
|
|
const int find_next= 1;
|
|
pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
|
|
if (find_next) {
|
|
for(;;) {
|
|
url_fseek(s->pb, pos, SEEK_SET);
|
|
if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
|
|
return AV_NOPTS_VALUE;
|
|
if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
|
|
parse_pcr(×tamp, &pcr_l, buf) == 0) {
|
|
break;
|
|
}
|
|
pos += ts->raw_packet_size;
|
|
}
|
|
} else {
|
|
for(;;) {
|
|
pos -= ts->raw_packet_size;
|
|
if (pos < 0)
|
|
return AV_NOPTS_VALUE;
|
|
url_fseek(s->pb, pos, SEEK_SET);
|
|
if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
|
|
return AV_NOPTS_VALUE;
|
|
if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
|
|
parse_pcr(×tamp, &pcr_l, buf) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
*ppos = pos;
|
|
|
|
return timestamp;
|
|
}
|
|
|
|
#ifdef USE_SYNCPOINT_SEARCH
|
|
|
|
static int read_seek2(AVFormatContext *s,
|
|
int stream_index,
|
|
int64_t min_ts,
|
|
int64_t target_ts,
|
|
int64_t max_ts,
|
|
int flags)
|
|
{
|
|
int64_t pos;
|
|
|
|
int64_t ts_ret, ts_adj;
|
|
int stream_index_gen_search;
|
|
AVStream *st;
|
|
AVParserState *backup;
|
|
|
|
backup = ff_store_parser_state(s);
|
|
|
|
// detect direction of seeking for search purposes
|
|
flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
|
|
AVSEEK_FLAG_BACKWARD : 0;
|
|
|
|
if (flags & AVSEEK_FLAG_BYTE) {
|
|
// use position directly, we will search starting from it
|
|
pos = target_ts;
|
|
} else {
|
|
// search for some position with good timestamp match
|
|
if (stream_index < 0) {
|
|
stream_index_gen_search = av_find_default_stream_index(s);
|
|
if (stream_index_gen_search < 0) {
|
|
ff_restore_parser_state(s, backup);
|
|
return -1;
|
|
}
|
|
|
|
st = s->streams[stream_index_gen_search];
|
|
// timestamp for default must be expressed in AV_TIME_BASE units
|
|
ts_adj = av_rescale(target_ts,
|
|
st->time_base.den,
|
|
AV_TIME_BASE * (int64_t)st->time_base.num);
|
|
} else {
|
|
ts_adj = target_ts;
|
|
stream_index_gen_search = stream_index;
|
|
}
|
|
pos = av_gen_search(s, stream_index_gen_search, ts_adj,
|
|
0, INT64_MAX, -1,
|
|
AV_NOPTS_VALUE,
|
|
AV_NOPTS_VALUE,
|
|
flags, &ts_ret, mpegts_get_pcr);
|
|
if (pos < 0) {
|
|
ff_restore_parser_state(s, backup);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
// search for actual matching keyframe/starting position for all streams
|
|
if (ff_gen_syncpoint_search(s, stream_index, pos,
|
|
min_ts, target_ts, max_ts,
|
|
flags) < 0) {
|
|
ff_restore_parser_state(s, backup);
|
|
return -1;
|
|
}
|
|
|
|
ff_free_parser_state(s, backup);
|
|
return 0;
|
|
}
|
|
|
|
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
|
|
{
|
|
int ret;
|
|
if (flags & AVSEEK_FLAG_BACKWARD) {
|
|
flags &= ~AVSEEK_FLAG_BACKWARD;
|
|
ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
|
|
if (ret < 0)
|
|
// for compatibility reasons, seek to the best-fitting timestamp
|
|
ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
|
|
} else {
|
|
ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
|
|
if (ret < 0)
|
|
// for compatibility reasons, seek to the best-fitting timestamp
|
|
ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#else
|
|
|
|
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
|
|
MpegTSContext *ts = s->priv_data;
|
|
uint8_t buf[TS_PACKET_SIZE];
|
|
int64_t pos;
|
|
|
|
if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
|
|
return -1;
|
|
|
|
pos= url_ftell(s->pb);
|
|
|
|
for(;;) {
|
|
url_fseek(s->pb, pos, SEEK_SET);
|
|
if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
|
|
return -1;
|
|
// pid = AV_RB16(buf + 1) & 0x1fff;
|
|
if(buf[1] & 0x40) break;
|
|
pos += ts->raw_packet_size;
|
|
}
|
|
url_fseek(s->pb, pos, SEEK_SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
/**************************************************************/
|
|
/* parsing functions - called from other demuxers such as RTP */
|
|
|
|
MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
|
|
{
|
|
MpegTSContext *ts;
|
|
|
|
ts = av_mallocz(sizeof(MpegTSContext));
|
|
if (!ts)
|
|
return NULL;
|
|
/* no stream case, currently used by RTP */
|
|
ts->raw_packet_size = TS_PACKET_SIZE;
|
|
ts->stream = s;
|
|
ts->auto_guess = 1;
|
|
return ts;
|
|
}
|
|
|
|
/* return the consumed length if a packet was output, or -1 if no
|
|
packet is output */
|
|
int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
|
|
const uint8_t *buf, int len)
|
|
{
|
|
int len1;
|
|
|
|
len1 = len;
|
|
ts->pkt = pkt;
|
|
ts->stop_parse = 0;
|
|
for(;;) {
|
|
if (ts->stop_parse>0)
|
|
break;
|
|
if (len < TS_PACKET_SIZE)
|
|
return -1;
|
|
if (buf[0] != 0x47) {
|
|
buf++;
|
|
len--;
|
|
} else {
|
|
handle_packet(ts, buf);
|
|
buf += TS_PACKET_SIZE;
|
|
len -= TS_PACKET_SIZE;
|
|
}
|
|
}
|
|
return len1 - len;
|
|
}
|
|
|
|
void ff_mpegts_parse_close(MpegTSContext *ts)
|
|
{
|
|
int i;
|
|
|
|
for(i=0;i<NB_PID_MAX;i++)
|
|
av_free(ts->pids[i]);
|
|
av_free(ts);
|
|
}
|
|
|
|
AVInputFormat mpegts_demuxer = {
|
|
"mpegts",
|
|
NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
|
|
sizeof(MpegTSContext),
|
|
mpegts_probe,
|
|
mpegts_read_header,
|
|
mpegts_read_packet,
|
|
mpegts_read_close,
|
|
read_seek,
|
|
mpegts_get_pcr,
|
|
.flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
|
|
#ifdef USE_SYNCPOINT_SEARCH
|
|
.read_seek2 = read_seek2,
|
|
#endif
|
|
};
|
|
|
|
AVInputFormat mpegtsraw_demuxer = {
|
|
"mpegtsraw",
|
|
NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
|
|
sizeof(MpegTSContext),
|
|
NULL,
|
|
mpegts_read_header,
|
|
mpegts_raw_read_packet,
|
|
mpegts_read_close,
|
|
read_seek,
|
|
mpegts_get_pcr,
|
|
.flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
|
|
#ifdef USE_SYNCPOINT_SEARCH
|
|
.read_seek2 = read_seek2,
|
|
#endif
|
|
};
|