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mpegts.c
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mpegts.c
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/*
* MPEG2 transport stream (aka DVB) demuxer
* Copyright (c) 2002-2003 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
//#define USE_SYNCPOINT_SEARCH
#include "libavutil/crc.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/avassert.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/get_bits.h"
#include "avformat.h"
#include "mpegts.h"
#include "internal.h"
#include "avio_internal.h"
#include "seek.h"
#include "mpeg.h"
#include "isom.h"
/* maximum size in which we look for synchronisation if
synchronisation is lost */
#define MAX_RESYNC_SIZE 65536
#define MAX_PES_PAYLOAD 200*1024
#define MAX_MP4_DESCR_COUNT 16
enum MpegTSFilterType {
MPEGTS_PES,
MPEGTS_SECTION,
};
typedef struct MpegTSFilter MpegTSFilter;
typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
typedef struct MpegTSPESFilter {
PESCallback *pes_cb;
void *opaque;
} MpegTSPESFilter;
typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
typedef void SetServiceCallback(void *opaque, int ret);
typedef struct MpegTSSectionFilter {
int section_index;
int section_h_size;
uint8_t *section_buf;
unsigned int check_crc:1;
unsigned int end_of_section_reached:1;
SectionCallback *section_cb;
void *opaque;
} MpegTSSectionFilter;
struct MpegTSFilter {
int pid;
int es_id;
int last_cc; /* last cc code (-1 if first packet) */
enum MpegTSFilterType type;
union {
MpegTSPESFilter pes_filter;
MpegTSSectionFilter section_filter;
} u;
};
#define MAX_PIDS_PER_PROGRAM 64
struct Program {
unsigned int id; //program id/service id
unsigned int nb_pids;
unsigned int pids[MAX_PIDS_PER_PROGRAM];
};
struct MpegTSContext {
const AVClass *class;
/* user data */
AVFormatContext *stream;
/** raw packet size, including FEC if present */
int raw_packet_size;
int pos47;
/** if true, all pids are analyzed to find streams */
int auto_guess;
/** compute exact PCR for each transport stream packet */
int mpeg2ts_compute_pcr;
int64_t cur_pcr; /**< used to estimate the exact PCR */
int pcr_incr; /**< used to estimate the exact PCR */
/* data needed to handle file based ts */
/** stop parsing loop */
int stop_parse;
/** packet containing Audio/Video data */
AVPacket *pkt;
/** to detect seek */
int64_t last_pos;
/******************************************/
/* private mpegts data */
/* scan context */
/** structure to keep track of Program->pids mapping */
unsigned int nb_prg;
struct Program *prg;
/** filters for various streams specified by PMT + for the PAT and PMT */
MpegTSFilter *pids[NB_PID_MAX];
};
static const AVOption options[] = {
{"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
{.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
static const AVClass mpegtsraw_class = {
.class_name = "mpegtsraw demuxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
/* TS stream handling */
enum MpegTSState {
MPEGTS_HEADER = 0,
MPEGTS_PESHEADER,
MPEGTS_PESHEADER_FILL,
MPEGTS_PAYLOAD,
MPEGTS_SKIP,
};
/* enough for PES header + length */
#define PES_START_SIZE 6
#define PES_HEADER_SIZE 9
#define MAX_PES_HEADER_SIZE (9 + 255)
typedef struct PESContext {
int pid;
int pcr_pid; /**< if -1 then all packets containing PCR are considered */
int stream_type;
MpegTSContext *ts;
AVFormatContext *stream;
AVStream *st;
AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
enum MpegTSState state;
/* used to get the format */
int data_index;
int flags; /**< copied to the AVPacket flags */
int total_size;
int pes_header_size;
int extended_stream_id;
int64_t pts, dts;
int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
uint8_t header[MAX_PES_HEADER_SIZE];
uint8_t *buffer;
SLConfigDescr sl;
} PESContext;
extern AVInputFormat ff_mpegts_demuxer;
static void clear_program(MpegTSContext *ts, unsigned int programid)
{
int i;
for(i=0; i<ts->nb_prg; i++)
if(ts->prg[i].id == programid)
ts->prg[i].nb_pids = 0;
}
static void clear_programs(MpegTSContext *ts)
{
av_freep(&ts->prg);
ts->nb_prg=0;
}
static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
{
struct Program *p;
void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
if(!tmp)
return;
ts->prg = tmp;
p = &ts->prg[ts->nb_prg];
p->id = programid;
p->nb_pids = 0;
ts->nb_prg++;
}
static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
{
int i;
struct Program *p = NULL;
for(i=0; i<ts->nb_prg; i++) {
if(ts->prg[i].id == programid) {
p = &ts->prg[i];
break;
}
}
if(!p)
return;
if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
return;
p->pids[p->nb_pids++] = pid;
}
static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
{
int i;
for(i=0; i<s->nb_programs; i++) {
if(s->programs[i]->id == programid) {
s->programs[i]->pcr_pid = pid;
break;
}
}
}
/**
* @brief discard_pid() decides if the pid is to be discarded according
* to caller's programs selection
* @param ts : - TS context
* @param pid : - pid
* @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
* 0 otherwise
*/
static int discard_pid(MpegTSContext *ts, unsigned int pid)
{
int i, j, k;
int used = 0, discarded = 0;
struct Program *p;
for(i=0; i<ts->nb_prg; i++) {
p = &ts->prg[i];
for(j=0; j<p->nb_pids; j++) {
if(p->pids[j] != pid)
continue;
//is program with id p->id set to be discarded?
for(k=0; k<ts->stream->nb_programs; k++) {
if(ts->stream->programs[k]->id == p->id) {
if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
discarded++;
else
used++;
}
}
}
}
return !used && discarded;
}
/**
* Assemble PES packets out of TS packets, and then call the "section_cb"
* function when they are complete.
*/
static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
const uint8_t *buf, int buf_size, int is_start)
{
MpegTSSectionFilter *tss = &tss1->u.section_filter;
int len;
if (is_start) {
memcpy(tss->section_buf, buf, buf_size);
tss->section_index = buf_size;
tss->section_h_size = -1;
tss->end_of_section_reached = 0;
} else {
if (tss->end_of_section_reached)
return;
len = 4096 - tss->section_index;
if (buf_size < len)
len = buf_size;
memcpy(tss->section_buf + tss->section_index, buf, len);
tss->section_index += len;
}
/* compute section length if possible */
if (tss->section_h_size == -1 && tss->section_index >= 3) {
len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
if (len > 4096)
return;
tss->section_h_size = len;
}
if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
tss->end_of_section_reached = 1;
if (!tss->check_crc ||
av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
tss->section_buf, tss->section_h_size) == 0)
tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
}
}
static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
SectionCallback *section_cb, void *opaque,
int check_crc)
{
MpegTSFilter *filter;
MpegTSSectionFilter *sec;
av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
if (pid >= NB_PID_MAX || ts->pids[pid])
return NULL;
filter = av_mallocz(sizeof(MpegTSFilter));
if (!filter)
return NULL;
ts->pids[pid] = filter;
filter->type = MPEGTS_SECTION;
filter->pid = pid;
filter->es_id = -1;
filter->last_cc = -1;
sec = &filter->u.section_filter;
sec->section_cb = section_cb;
sec->opaque = opaque;
sec->section_buf = av_malloc(MAX_SECTION_SIZE);
sec->check_crc = check_crc;
if (!sec->section_buf) {
av_free(filter);
return NULL;
}
return filter;
}
static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
PESCallback *pes_cb,
void *opaque)
{
MpegTSFilter *filter;
MpegTSPESFilter *pes;
if (pid >= NB_PID_MAX || ts->pids[pid])
return NULL;
filter = av_mallocz(sizeof(MpegTSFilter));
if (!filter)
return NULL;
ts->pids[pid] = filter;
filter->type = MPEGTS_PES;
filter->pid = pid;
filter->es_id = -1;
filter->last_cc = -1;
pes = &filter->u.pes_filter;
pes->pes_cb = pes_cb;
pes->opaque = opaque;
return filter;
}
static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
{
int pid;
pid = filter->pid;
if (filter->type == MPEGTS_SECTION)
av_freep(&filter->u.section_filter.section_buf);
else if (filter->type == MPEGTS_PES) {
PESContext *pes = filter->u.pes_filter.opaque;
av_freep(&pes->buffer);
/* referenced private data will be freed later in
* avformat_close_input */
if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
av_freep(&filter->u.pes_filter.opaque);
}
}
av_free(filter);
ts->pids[pid] = NULL;
}
static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
int stat[TS_MAX_PACKET_SIZE];
int i;
int x=0;
int best_score=0;
memset(stat, 0, packet_size*sizeof(int));
for(x=i=0; i<size-3; i++){
if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){
stat[x]++;
if(stat[x] > best_score){
best_score= stat[x];
if(index) *index= x;
}
}
x++;
if(x == packet_size) x= 0;
}
return best_score;
}
/* autodetect fec presence. Must have at least 1024 bytes */
static int get_packet_size(const uint8_t *buf, int size)
{
int score, fec_score, dvhs_score;
if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
return -1;
score = analyze(buf, size, TS_PACKET_SIZE, NULL);
dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
// av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
else return -1;
}
typedef struct SectionHeader {
uint8_t tid;
uint16_t id;
uint8_t version;
uint8_t sec_num;
uint8_t last_sec_num;
} SectionHeader;
static inline int get8(const uint8_t **pp, const uint8_t *p_end)
{
const uint8_t *p;
int c;
p = *pp;
if (p >= p_end)
return -1;
c = *p++;
*pp = p;
return c;
}
static inline int get16(const uint8_t **pp, const uint8_t *p_end)
{
const uint8_t *p;
int c;
p = *pp;
if ((p + 1) >= p_end)
return -1;
c = AV_RB16(p);
p += 2;
*pp = p;
return c;
}
/* read and allocate a DVB string preceded by its length */
static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
{
int len;
const uint8_t *p;
char *str;
p = *pp;
len = get8(&p, p_end);
if (len < 0)
return NULL;
if ((p + len) > p_end)
return NULL;
str = av_malloc(len + 1);
if (!str)
return NULL;
memcpy(str, p, len);
str[len] = '\0';
p += len;
*pp = p;
return str;
}
static int parse_section_header(SectionHeader *h,
const uint8_t **pp, const uint8_t *p_end)
{
int val;
val = get8(pp, p_end);
if (val < 0)
return -1;
h->tid = val;
*pp += 2;
val = get16(pp, p_end);
if (val < 0)
return -1;
h->id = val;
val = get8(pp, p_end);
if (val < 0)
return -1;
h->version = (val >> 1) & 0x1f;
val = get8(pp, p_end);
if (val < 0)
return -1;
h->sec_num = val;
val = get8(pp, p_end);
if (val < 0)
return -1;
h->last_sec_num = val;
return 0;
}
typedef struct {
uint32_t stream_type;
enum AVMediaType codec_type;
enum CodecID codec_id;
} StreamType;
static const StreamType ISO_types[] = {
{ 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
{ 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
{ 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
{ 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
{ 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
{ 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
/* Makito encoder sets stream type 0x11 for AAC,
* so auto-detect LOAS/LATM instead of hardcoding it. */
// { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
{ 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
{ 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
{ 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
{ 0 },
};
static const StreamType HDMV_types[] = {
{ 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
{ 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
{ 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
{ 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
{ 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
{ 0x85, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS HD */
{ 0x86, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS HD MASTER*/
{ 0xa1, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
{ 0xa2, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS Express Secondary Audio */
{ 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
{ 0 },
};
/* ATSC ? */
static const StreamType MISC_types[] = {
{ 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
{ 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
{ 0 },
};
static const StreamType REGD_types[] = {
{ MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
{ MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
{ MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
{ MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
{ MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
{ MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
{ MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
{ 0 },
};
/* descriptor present */
static const StreamType DESC_types[] = {
{ 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
{ 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
{ 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
{ 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
{ 0x59, AVMEDIA_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;
st->request_probe = 0;
return;
}
}
}
static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
uint32_t stream_type, uint32_t prog_reg_desc)
{
int old_codec_type= st->codec->codec_type;
int old_codec_id = st->codec->codec_id;
avpriv_set_pts_info(st, 33, 1, 90000);
st->priv_data = pes;
st->codec->codec_type = AVMEDIA_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") ||
prog_reg_desc == AV_RL32("HDPR")) &&
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 = avformat_new_stream(pes->stream, NULL);
if (!sub_st) {
av_free(sub_pes);
return AVERROR(ENOMEM);
}
sub_st->id = pes->pid;
avpriv_set_pts_info(sub_st, 33, 1, 90000);
sub_st->priv_data = sub_pes;
sub_st->codec->codec_type = AVMEDIA_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);
if (st->codec->codec_id == CODEC_ID_NONE){
st->codec->codec_id = old_codec_id;
st->codec->codec_type= old_codec_type;
}
return 0;
}
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;
if(pes->total_size != MAX_PES_PAYLOAD &&
pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
pes->flags |= AV_PKT_FLAG_CORRUPT;
}
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;
pkt->flags = pes->flags;
/* reset pts values */
pes->pts = AV_NOPTS_VALUE;
pes->dts = AV_NOPTS_VALUE;
pes->buffer = NULL;
pes->data_index = 0;
pes->flags = 0;
}
static uint64_t get_bits64(GetBitContext *gb, int bits)
{
uint64_t ret = 0;
while (bits > 17) {
ret <<= 17;
ret |= get_bits(gb, 17);
bits -= 17;
}
ret <<= bits;
ret |= get_bits(gb, bits);
return ret;
}
static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
{
GetBitContext gb;
int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
int dts_flag = -1, cts_flag = -1;
int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
init_get_bits(&gb, buf, buf_size*8);
if (sl->use_au_start)
au_start_flag = get_bits1(&gb);
if (sl->use_au_end)
au_end_flag = get_bits1(&gb);
if (!sl->use_au_start && !sl->use_au_end)
au_start_flag = au_end_flag = 1;
if (sl->ocr_len > 0)
ocr_flag = get_bits1(&gb);
if (sl->use_idle)
idle_flag = get_bits1(&gb);
if (sl->use_padding)
padding_flag = get_bits1(&gb);
if (padding_flag)
padding_bits = get_bits(&gb, 3);
if (!idle_flag && (!padding_flag || padding_bits != 0)) {
if (sl->packet_seq_num_len)
skip_bits_long(&gb, sl->packet_seq_num_len);
if (sl->degr_prior_len)
if (get_bits1(&gb))
skip_bits(&gb, sl->degr_prior_len);
if (ocr_flag)
skip_bits_long(&gb, sl->ocr_len);
if (au_start_flag) {
if (sl->use_rand_acc_pt)
get_bits1(&gb);
if (sl->au_seq_num_len > 0)
skip_bits_long(&gb, sl->au_seq_num_len);
if (sl->use_timestamps) {
dts_flag = get_bits1(&gb);
cts_flag = get_bits1(&gb);
}
}
if (sl->inst_bitrate_len)
inst_bitrate_flag = get_bits1(&gb);
if (dts_flag == 1)
dts = get_bits64(&gb, sl->timestamp_len);
if (cts_flag == 1)
cts = get_bits64(&gb, sl->timestamp_len);
if (sl->au_len > 0)
skip_bits_long(&gb, sl->au_len);
if (inst_bitrate_flag)
skip_bits_long(&gb, sl->inst_bitrate_len);
}
if (dts != AV_NOPTS_VALUE)
pes->dts = dts;
if (cts != AV_NOPTS_VALUE)
pes->pts = cts;
if (sl->timestamp_len && sl->timestamp_res)
avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
return (get_bits_count(&gb) + 7) >> 3;
}
/* 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 (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
pes->header[2] == 0x01) {
/* it must be an mpeg2 PES stream */
code = pes->header[3] | 0x100;
av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
code == 0x1be) /* padding_stream */
goto skip;
/* stream not present in PMT */
if (!pes->st) {
pes->st = avformat_new_stream(ts->stream, NULL);
if (!pes->st)
return AVERROR(ENOMEM);
pes->st->id = pes->pid;
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 && !pes->st->request_probe) {
av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
pes->pid, pes->stream_type);
pes->st->request_probe= 1;
}
} 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 = ff_parse_pes_pts(r);
r += 5;
} else if ((flags & 0xc0) == 0xc0) {
pes->pts = ff_parse_pes_pts(r);
r += 5;
pes->dts = ff_parse_pes_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;
if (pes->stream_type == 0x12) {
int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
pes->pes_header_size += sl_header_bytes;
p += sl_header_bytes;
buf_size -= sl_header_bytes;
}
}
break;
case MPEGTS_PAYLOAD:
if (buf_size > 0 && pes->buffer) {
if (pes->data_index > 0 && 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;
} else if (pes->data_index == 0 && buf_size > pes->total_size) {
// pes packet size is < ts size packet and pes data is padded with 0xff
// not sure if this is legal in ts but see issue #2392
buf_size = pes->total_size;
}
memcpy(pes->buffer+pes->data_index, p, buf_size);
pes->data_index += buf_size;
}
buf_size = 0;
/* emit complete packets with known packet size
* decreases demuxer delay for infrequent packets like subtitles from
* a couple of seconds to milliseconds for properly muxed files.
* total_size is the number of bytes following pes_packet_length
* in the pes header, i.e. not counting the first PES_START_SIZE bytes */
if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
ts->stop_parse = 1;
new_pes_packet(pes, ts->pkt);
}
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;
}
#define MAX_LEVEL 4
typedef struct {
AVFormatContext *s;
AVIOContext pb;
Mp4Descr *descr;
Mp4Descr *active_descr;
int descr_count;
int max_descr_count;
int level;