virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity
83c12fefd2
FFmpeg/libavformat/mpegts.c
wm4 66cf78e932 lavf: consider codec framerate for framerate detection 
Fixes detection of some TV sample as 24.5 FPS. With the patch applied,
it's detected as 25 FPS.

This is enabled for mpegts only.
2017-06-07 11:08:06 +02:00

2961 lines
98 KiB
C
Raw Blame History

/*
* MPEG-2 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
*/
#include "libavutil/buffer.h"
#include "libavutil/crc.h"
#include "libavutil/internal.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 "libavcodec/opus.h"
#include "avformat.h"
#include "mpegts.h"
#include "internal.h"
#include "avio_internal.h"
#include "mpeg.h"
#include "isom.h"
/* maximum size in which we look for synchronization if
* synchronization is lost */
#define MAX_RESYNC_SIZE 65536
#define MAX_PES_PAYLOAD 200 * 1024
#define MAX_MP4_DESCR_COUNT 16
#define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
do { \
if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
(modulus) = (dividend) % (divisor); \
(prev_dividend) = (dividend); \
} while (0)
enum MpegTSFilterType {
MPEGTS_PES,
MPEGTS_SECTION,
MPEGTS_PCR,
};
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;
int last_ver;
unsigned crc;
unsigned last_crc;
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) */
int64_t last_pcr;
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];
/** have we found pmt for this program */
int pmt_found;
};
struct MpegTSContext {
const AVClass *class;
/* user data */
AVFormatContext *stream;
/** raw packet size, including FEC if present */
int raw_packet_size;
int size_stat[3];
int size_stat_count;
#define SIZE_STAT_THRESHOLD 10
int64_t pos47_full;
/** if true, all pids are analyzed to find streams */
int auto_guess;
/** compute exact PCR for each transport stream packet */
int mpeg2ts_compute_pcr;
/** fix dvb teletext pts */
int fix_teletext_pts;
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;
int skip_changes;
int skip_clear;
int scan_all_pmts;
int resync_size;
/******************************************/
/* private mpegts data */
/* scan context */
/** structure to keep track of Program->pids mapping */
unsigned int nb_prg;
struct Program *prg;
int8_t crc_validity[NB_PID_MAX];
/** filters for various streams specified by PMT + for the PAT and PMT */
MpegTSFilter *pids[NB_PID_MAX];
int current_pid;
};
#define MPEGTS_OPTIONS \
{ "resync_size", "set size limit for looking up a new synchronization", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT, { .i64 = MAX_RESYNC_SIZE}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }
static const AVOption options[] = {
MPEGTS_OPTIONS,
{"fix_teletext_pts", "try to fix pts values of dvb teletext streams", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_BOOL,
{.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{"ts_packetsize", "output option carrying the raw packet size", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
{.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
{"scan_all_pmts", "scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_BOOL,
{ .i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
{"skip_changes", "skip changing / adding streams / programs", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_BOOL,
{.i64 = 0}, 0, 1, 0 },
{"skip_clear", "skip clearing programs", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_BOOL,
{.i64 = 0}, 0, 1, 0 },
{ NULL },
};
static const AVClass mpegts_class = {
.class_name = "mpegts demuxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVOption raw_options[] = {
MPEGTS_OPTIONS,
{ "compute_pcr", "compute exact PCR for each transport stream packet",
offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_BOOL,
{ .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ "ts_packetsize", "output option carrying the raw packet size",
offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
{ .i64 = 0 }, 0, 0,
AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
{ NULL },
};
static const AVClass mpegtsraw_class = {
.class_name = "mpegtsraw demuxer",
.item_name = av_default_item_name,
.option = raw_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;
uint8_t 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];
AVBufferRef *buffer;
SLConfigDescr sl;
} PESContext;
extern AVInputFormat ff_mpegts_demuxer;
static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
{
int i;
for (i = 0; i < ts->nb_prg; i++) {
if (ts->prg[i].id == programid) {
return &ts->prg[i];
}
}
return NULL;
}
static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
{
AVProgram *prg = NULL;
int i;
for (i = 0; i < ts->stream->nb_programs; i++)
if (ts->stream->programs[i]->id == programid) {
prg = ts->stream->programs[i];
break;
}
if (!prg)
return;
prg->nb_stream_indexes = 0;
}
static void clear_program(MpegTSContext *ts, unsigned int programid)
{
int i;
clear_avprogram(ts, programid);
for (i = 0; i < ts->nb_prg; i++)
if (ts->prg[i].id == programid) {
ts->prg[i].nb_pids = 0;
ts->prg[i].pmt_found = 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;
if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
ts->nb_prg = 0;
return;
}
p = &ts->prg[ts->nb_prg];
p->id = programid;
p->nb_pids = 0;
p->pmt_found = 0;
ts->nb_prg++;
}
static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
unsigned int pid)
{
struct Program *p = get_program(ts, programid);
int i;
if (!p)
return;
if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
return;
for (i = 0; i < p->nb_pids; i++)
if (p->pids[i] == pid)
return;
p->pids[p->nb_pids++] = pid;
}
static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
{
struct Program *p = get_program(ts, programid);
if (!p)
return;
p->pmt_found = 1;
}
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;
/* If none of the programs have .discard=AVDISCARD_ALL then there's
* no way we have to discard this packet */
for (k = 0; k < ts->stream->nb_programs; k++)
if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
break;
if (k == ts->stream->nb_programs)
return 0;
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(MpegTSContext *ts, 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) {
int crc_valid = 1;
tss->end_of_section_reached = 1;
if (tss->check_crc) {
crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
if (tss->section_h_size >= 4)
tss->crc = AV_RB32(tss->section_buf + tss->section_h_size - 4);
if (crc_valid) {
ts->crc_validity[ tss1->pid ] = 100;
}else if (ts->crc_validity[ tss1->pid ] > -10) {
ts->crc_validity[ tss1->pid ]--;
}else
crc_valid = 2;
}
if (crc_valid) {
tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
if (crc_valid != 1)
tss->last_ver = -1;
}
}
}
static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
enum MpegTSFilterType type)
{
MpegTSFilter *filter;
av_log(ts->stream, AV_LOG_TRACE, "Filter: pid=0x%x type=%d\n", pid, type);
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 = type;
filter->pid = pid;
filter->es_id = -1;
filter->last_cc = -1;
filter->last_pcr= -1;
return filter;
}
static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
unsigned int pid,
SectionCallback *section_cb,
void *opaque,
int check_crc)
{
MpegTSFilter *filter;
MpegTSSectionFilter *sec;
if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
return NULL;
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;
sec->last_ver = -1;
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 (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
return NULL;
pes = &filter->u.pes_filter;
pes->pes_cb = pes_cb;
pes->opaque = opaque;
return filter;
}
static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
{
return mpegts_open_filter(ts, pid, MPEGTS_PCR);
}
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_buffer_unref(&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 probe)
{
int stat[TS_MAX_PACKET_SIZE];
int stat_all = 0;
int i;
int best_score = 0;
memset(stat, 0, packet_size * sizeof(*stat));
for (i = 0; i < size - 3; i++) {
if (buf[i] == 0x47) {
int pid = AV_RB16(buf+1) & 0x1FFF;
int asc = buf[i + 3] & 0x30;
if (!probe || pid == 0x1FFF || asc) {
int x = i % packet_size;
stat[x]++;
stat_all++;
if (stat[x] > best_score) {
best_score = stat[x];
}
}
}
}
return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
}
/* 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 AVERROR_INVALIDDATA;
score = analyze(buf, size, TS_PACKET_SIZE, 0);
dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, 0);
fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, 0);
av_log(NULL, AV_LOG_TRACE, "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 AVERROR_INVALIDDATA;
}
typedef struct SectionHeader {
uint8_t tid;
uint16_t id;
uint8_t version;
uint8_t sec_num;
uint8_t last_sec_num;
} SectionHeader;
static int skip_identical(const SectionHeader *h, MpegTSSectionFilter *tssf)
{
if (h->version == tssf->last_ver && tssf->last_crc == tssf->crc)
return 1;
tssf->last_ver = h->version;
tssf->last_crc = tssf->crc;
return 0;
}
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 AVERROR_INVALIDDATA;
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 (1 >= p_end - p)
return AVERROR_INVALIDDATA;
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 (len > p_end - p)
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 val;
h->tid = val;
*pp += 2;
val = get16(pp, p_end);
if (val < 0)
return val;
h->id = val;
val = get8(pp, p_end);
if (val < 0)
return val;
h->version = (val >> 1) & 0x1f;
val = get8(pp, p_end);
if (val < 0)
return val;
h->sec_num = val;
val = get8(pp, p_end);
if (val < 0)
return val;
h->last_sec_num = val;
return 0;
}
typedef struct StreamType {
uint32_t stream_type;
enum AVMediaType codec_type;
enum AVCodecID codec_id;
} StreamType;
static const StreamType ISO_types[] = {
{ 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
{ 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
{ 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
{ 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
{ 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
{ 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
/* Makito encoder sets stream type 0x11 for AAC,
* so auto-detect LOAS/LATM instead of hardcoding it. */
#if !CONFIG_LOAS_DEMUXER
{ 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
#endif
{ 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
{ 0x1c, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
{ 0x20, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
{ 0x21, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_JPEG2000 },
{ 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
{ 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
{ 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
{ 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
{ 0 },
};
static const StreamType HDMV_types[] = {
{ 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
{ 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
{ 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
{ 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
{ 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
{ 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
{ 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
{ 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
{ 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
{ 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
{ 0x92, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_TEXT_SUBTITLE },
{ 0 },
};
/* SCTE types */
static const StreamType SCTE_types[] = {
{ 0x86, AVMEDIA_TYPE_DATA, AV_CODEC_ID_SCTE_35 },
{ 0 },
};
/* ATSC ? */
static const StreamType MISC_types[] = {
{ 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
{ 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
{ 0 },
};
static const StreamType REGD_types[] = {
{ MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
{ MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
{ MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
{ MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
{ MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
{ MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
{ MKTAG('E', 'A', 'C', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
{ MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
{ MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
{ MKTAG('I', 'D', '3', ' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
{ MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
{ MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
{ 0 },
};
static const StreamType METADATA_types[] = {
{ MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
{ MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
{ 0 },
};
/* descriptor present */
static const StreamType DESC_types[] = {
{ 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
{ 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
{ 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
{ 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
{ 0x59, AVMEDIA_TYPE_SUBTITLE, AV_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) {
if (st->codecpar->codec_type != types->codec_type ||
st->codecpar->codec_id != types->codec_id) {
st->codecpar->codec_type = types->codec_type;
st->codecpar->codec_id = types->codec_id;
st->internal->need_context_update = 1;
}
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->codecpar->codec_type;
int old_codec_id = st->codecpar->codec_id;
int old_codec_tag = st->codecpar->codec_tag;
if (avcodec_is_open(st->internal->avctx)) {
av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, internal codec is open\n");
return 0;
}
avpriv_set_pts_info(st, 33, 1, 90000);
st->priv_data = pes;
st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
st->codecpar->codec_id = AV_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->codecpar->codec_tag = pes->stream_type;
mpegts_find_stream_type(st, pes->stream_type, ISO_types);
if (pes->stream_type == 4)
st->request_probe = 50;
if ((prog_reg_desc == AV_RL32("HDMV") ||
prog_reg_desc == AV_RL32("HDPR")) &&
st->codecpar->codec_id == AV_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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
sub_st->codecpar->codec_id = AV_CODEC_ID_AC3;
sub_st->need_parsing = AVSTREAM_PARSE_FULL;
sub_pes->sub_st = pes->sub_st = sub_st;
}
}
if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
mpegts_find_stream_type(st, pes->stream_type, MISC_types);
if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
st->codecpar->codec_id = old_codec_id;
st->codecpar->codec_type = old_codec_type;
}
if ((st->codecpar->codec_id == AV_CODEC_ID_NONE ||
(st->request_probe > 0 && st->request_probe < AVPROBE_SCORE_STREAM_RETRY / 5)) &&
st->probe_packets > 0 &&
stream_type == STREAM_TYPE_PRIVATE_DATA) {
st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
st->codecpar->codec_id = AV_CODEC_ID_BIN_DATA;
st->request_probe = AVPROBE_SCORE_STREAM_RETRY / 5;
}
/* queue a context update if properties changed */
if (old_codec_type != st->codecpar->codec_type ||
old_codec_id != st->codecpar->codec_id ||
old_codec_tag != st->codecpar->codec_tag)
st->internal->need_context_update = 1;
return 0;
}
static void reset_pes_packet_state(PESContext *pes)
{
pes->pts = AV_NOPTS_VALUE;
pes->dts = AV_NOPTS_VALUE;
pes->data_index = 0;
pes->flags = 0;
av_buffer_unref(&pes->buffer);
}
static void new_data_packet(const uint8_t *buffer, int len, AVPacket *pkt)
{
av_init_packet(pkt);
pkt->data = (uint8_t *)buffer;
pkt->size = len;
}
static int new_pes_packet(PESContext *pes, AVPacket *pkt)
{
char *sd;
av_init_packet(pkt);
pkt->buf = pes->buffer;
pkt->data = pes->buffer->data;
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, AV_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;
pes->buffer = NULL;
reset_pes_packet_state(pes);
sd = av_packet_new_side_data(pkt, AV_PKT_DATA_MPEGTS_STREAM_ID, 1);
if (!sd)
return AVERROR(ENOMEM);
*sd = pes->stream_id;
return 0;
}
static uint64_t get_ts64(GetBitContext *gb, int bits)
{
if (get_bits_left(gb) < bits)
return AV_NOPTS_VALUE;
return get_bits64(gb, bits);
}
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;
uint8_t buf_padded[128 + AV_INPUT_BUFFER_PADDING_SIZE];
int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - AV_INPUT_BUFFER_PADDING_SIZE);
memcpy(buf_padded, buf, buf_padded_size);
init_get_bits(&gb, buf_padded, buf_padded_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_ts64(&gb, sl->timestamp_len);
if (cts_flag == 1)
cts = get_ts64(&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 ret, len, code;
if (!ts->pkt)
return 0;
if (is_start) {
if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
ret = new_pes_packet(pes, ts->pkt);
if (ret < 0)
return ret;
ts->stop_parse = 1;
} else {
reset_pes_packet_state(pes);
}
pes->state = MPEGTS_HEADER;
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 MPEG-2 PES stream */
code = pes->header[3] | 0x100;
av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
code);
pes->stream_id = pes->header[3];
if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
(!pes->sub_st ||
pes->sub_st->discard == AVDISCARD_ALL)) ||
code == 0x1be) /* padding_stream */
goto skip;
/* stream not present in PMT */
if (!pes->st) {
if (ts->skip_changes)
goto skip;
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_buffer_alloc(pes->total_size +
AV_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->codecpar->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
av_log(pes->stream, AV_LOG_TRACE,
"pid=%x stream_type=%x probing\n",
pes->pid,
pes->stream_type);
pes->st->request_probe = 1;
}
} else {
pes->pes_header_size = 6;
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 AVERROR_INVALIDDATA;
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 AVERROR_INVALIDDATA;
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 && buf_size > 0) {
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;
}
if (pes->stream_type == 0x15 && buf_size >= 5) {
/* skip metadata access unit header */
pes->pes_header_size += 5;
p += 5;
buf_size -= 5;
}
if ( pes->ts->fix_teletext_pts
&& ( pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT
|| pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
) {
AVProgram *p = NULL;
while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
if (f) {
AVStream *st = NULL;
if (f->type == MPEGTS_PES) {
PESContext *pcrpes = f->u.pes_filter.opaque;
if (pcrpes)
st = pcrpes->st;
} else if (f->type == MPEGTS_PCR) {
int i;
for (i = 0; i < p->nb_stream_indexes; i++) {
AVStream *pst = pes->stream->streams[p->stream_index[i]];
if (pst->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
st = pst;
}
}
if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
// teletext packets do not always have correct timestamps,
// the standard says they should be handled after 40.6 ms at most,
// and the pcr error to this packet should be no more than 100 ms.
// TODO: we should interpolate the PCR, not just use the last one
int64_t pcr = f->last_pcr / 300;
pes->st->pts_wrap_reference = st->pts_wrap_reference;
pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
pes->pts = pes->dts = pcr;
} else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT &&
pes->dts > pcr + 3654 + 9000) {
pes->pts = pes->dts = pcr + 3654 + 9000;
} else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE &&
pes->dts > pcr + 10*90000) { //10sec
pes->pts = pes->dts = pcr + 3654 + 9000;
}
break;
}
}
}
}
}
}
break;
case MPEGTS_PAYLOAD:
if (pes->buffer) {
if (pes->data_index > 0 &&
pes->data_index + buf_size > pes->total_size) {
ret = new_pes_packet(pes, ts->pkt);
if (ret < 0)
return ret;
pes->total_size = MAX_PES_PAYLOAD;
pes->buffer = av_buffer_alloc(pes->total_size +
AV_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->data + pes->data_index, p, buf_size);
pes->data_index += buf_size;
/* 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;
ret = new_pes_packet(pes, ts->pkt);
if (ret < 0)
return ret;
}
}
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;
}
#define MAX_LEVEL 4
typedef struct MP4DescrParseContext {
AVFormatContext *s;
AVIOContext pb;
Mp4Descr *descr;
Mp4Descr *active_descr;
int descr_count;
int max_descr_count;
int level;
int predefined_SLConfigDescriptor_seen;
} MP4DescrParseContext;
static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
const uint8_t *buf, unsigned size,
Mp4Descr *descr, int max_descr_count)
{
int ret;
if (size > (1 << 30))
return AVERROR_INVALIDDATA;
if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
NULL, NULL, NULL, NULL)) < 0)
return ret;
d->s = s;
d->level = 0;
d->descr_count = 0;
d->descr = descr;
d->active_descr = NULL;
d->max_descr_count = max_descr_count;
return 0;
}
static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
{
int64_t new_off = avio_tell(pb);
(*len) -= new_off - *off;
*off = new_off;
}
static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
int target_tag);
static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
{
while (len > 0) {
int ret = parse_mp4_descr(d, off, len, 0);
if (ret < 0)
return ret;
update_offsets(&d->pb, &off, &len);
}
return 0;
}
static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
{
avio_rb16(&d->pb); // ID
avio_r8(&d->pb);
avio_r8(&d->pb);
avio_r8(&d->pb);
avio_r8(&d->pb);
avio_r8(&d->pb);
update_offsets(&d->pb, &off, &len);
return parse_mp4_descr_arr(d, off, len);
}
static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
{
int id_flags;
if (len < 2)
return 0;
id_flags = avio_rb16(&d->pb);
if (!(id_flags & 0x0020)) { // URL_Flag
update_offsets(&d->pb, &off, &len);
return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
} else {
return 0;
}
}
static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
{
int es_id = 0;
int ret = 0;
if (d->descr_count >= d->max_descr_count)
return AVERROR_INVALIDDATA;
ff_mp4_parse_es_descr(&d->pb, &es_id);
d->active_descr = d->descr + (d->descr_count++);
d->active_descr->es_id = es_id;
update_offsets(&d->pb, &off, &len);
if ((ret = parse_mp4_descr(d, off, len, MP4DecConfigDescrTag)) < 0)
return ret;
update_offsets(&d->pb, &off, &len);
if (len > 0)
ret = parse_mp4_descr(d, off, len, MP4SLDescrTag);
d->active_descr = NULL;
return ret;
}
static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
int len)
{
Mp4Descr *descr = d->active_descr;
if (!descr)
return AVERROR_INVALIDDATA;
d->active_descr->dec_config_descr = av_malloc(len);
if (!descr->dec_config_descr)
return AVERROR(ENOMEM);
descr->dec_config_descr_len = len;
avio_read(&d->pb, descr->dec_config_descr, len);
return 0;
}
static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
{
Mp4Descr *descr = d->active_descr;
int predefined;
if (!descr)
return AVERROR_INVALIDDATA;
#define R8_CHECK_CLIP_MAX(dst, maxv) do { \
descr->sl.dst = avio_r8(&d->pb); \
if (descr->sl.dst > maxv) { \
descr->sl.dst = maxv; \
return AVERROR_INVALIDDATA; \
} \
} while (0)
predefined = avio_r8(&d->pb);
if (!predefined) {
int lengths;
int flags = avio_r8(&d->pb);
descr->sl.use_au_start = !!(flags & 0x80);
descr->sl.use_au_end = !!(flags & 0x40);
descr->sl.use_rand_acc_pt = !!(flags & 0x20);
descr->sl.use_padding = !!(flags & 0x08);
descr->sl.use_timestamps = !!(flags & 0x04);
descr->sl.use_idle = !!(flags & 0x02);
descr->sl.timestamp_res = avio_rb32(&d->pb);
avio_rb32(&d->pb);
R8_CHECK_CLIP_MAX(timestamp_len, 63);
R8_CHECK_CLIP_MAX(ocr_len, 63);
R8_CHECK_CLIP_MAX(au_len, 31);
descr->sl.inst_bitrate_len = avio_r8(&d->pb);
lengths = avio_rb16(&d->pb);
descr->sl.degr_prior_len = lengths >> 12;
descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
} else if (!d->predefined_SLConfigDescriptor_seen){
avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
d->predefined_SLConfigDescriptor_seen = 1;
}
return 0;
}
static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
int target_tag)
{
int tag;
int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
int ret = 0;
update_offsets(&d->pb, &off, &len);
if (len < 0 || len1 > len || len1 <= 0) {
av_log(d->s, AV_LOG_ERROR,
"Tag %x length violation new length %d bytes remaining %d\n",
tag, len1, len);
return AVERROR_INVALIDDATA;
}
if (d->level++ >= MAX_LEVEL) {
av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
ret = AVERROR_INVALIDDATA;
goto done;
}
if (target_tag && tag != target_tag) {
av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
target_tag);
ret = AVERROR_INVALIDDATA;
goto done;
}
switch (tag) {
case MP4IODescrTag:
ret = parse_MP4IODescrTag(d, off, len1);
break;
case MP4ODescrTag:
ret = parse_MP4ODescrTag(d, off, len1);
break;
case MP4ESDescrTag:
ret = parse_MP4ESDescrTag(d, off, len1);
break;
case MP4DecConfigDescrTag:
ret = parse_MP4DecConfigDescrTag(d, off, len1);
break;
case MP4SLDescrTag:
ret = parse_MP4SLDescrTag(d, off, len1);
break;
}
done:
d->level--;
avio_seek(&d->pb, off + len1, SEEK_SET);
return ret;
}
static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
Mp4Descr *descr, int *descr_count, int max_descr_count)
{
MP4DescrParseContext d;
int ret;
ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
if (ret < 0)
return ret;
ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
*descr_count = d.descr_count;
return ret;
}
static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
Mp4Descr *descr, int *descr_count, int max_descr_count)
{
MP4DescrParseContext d;
int ret;
ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
if (ret < 0)
return ret;
ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
*descr_count = d.descr_count;
return ret;
}
static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
int section_len)
{
MpegTSContext *ts = filter->u.section_filter.opaque;
MpegTSSectionFilter *tssf = &filter->u.section_filter;
SectionHeader h;
const uint8_t *p, *p_end;
AVIOContext pb;
int mp4_descr_count = 0;
Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
int i, pid;
AVFormatContext *s = ts->stream;
p_end = section + section_len - 4;
p = section;
if (parse_section_header(&h, &p, p_end) < 0)
return;
if (h.tid != M4OD_TID)
return;
if (skip_identical(&h, tssf))
return;
mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
MAX_MP4_DESCR_COUNT);
for (pid = 0; pid < NB_PID_MAX; pid++) {
if (!ts->pids[pid])
continue;
for (i = 0; i < mp4_descr_count; i++) {
PESContext *pes;
AVStream *st;
if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
continue;
if (ts->pids[pid]->type != MPEGTS_PES) {
av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
continue;
}
pes = ts->pids[pid]->u.pes_filter.opaque;
st = pes->st;
if (!st)
continue;
pes->sl = mp4_descr[i].sl;
ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
mp4_descr[i].dec_config_descr_len, 0,
NULL, NULL, NULL, NULL);
ff_mp4_read_dec_config_descr(s, st, &pb);
if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
st->codecpar->extradata_size > 0)
st->need_parsing = 0;
if (st->codecpar->codec_id == AV_CODEC_ID_H264 &&
st->codecpar->extradata_size > 0)
st->need_parsing = 0;
st->codecpar->codec_type = avcodec_get_type(st->codecpar->codec_id);
st->internal->need_context_update = 1;
}
}
for (i = 0; i < mp4_descr_count; i++)
av_free(mp4_descr[i].dec_config_descr);
}
static void scte_data_cb(MpegTSFilter *filter, const uint8_t *section,
int section_len)
{
AVProgram *prg = NULL;
MpegTSContext *ts = filter->u.section_filter.opaque;
int idx = ff_find_stream_index(ts->stream, filter->pid);
if (idx < 0)
return;
new_data_packet(section, section_len, ts->pkt);
ts->pkt->stream_index = idx;
prg = av_find_program_from_stream(ts->stream, NULL, idx);
if (prg && prg->pcr_pid != -1 && prg->discard != AVDISCARD_ALL) {
MpegTSFilter *f = ts->pids[prg->pcr_pid];
if (f && f->last_pcr != -1)
ts->pkt->pts = ts->pkt->dts = f->last_pcr/300;
}
ts->stop_parse = 1;
}
static const uint8_t opus_coupled_stream_cnt[9] = {
1, 0, 1, 1, 2, 2, 2, 3, 3
};
static const uint8_t opus_stream_cnt[9] = {
1, 1, 1, 2, 2, 3, 4, 4, 5,
};
static const uint8_t opus_channel_map[8][8] = {
{ 0 },
{ 0,1 },
{ 0,2,1 },
{ 0,1,2,3 },
{ 0,4,1,2,3 },
{ 0,4,1,2,3,5 },
{ 0,4,1,2,3,5,6 },
{ 0,6,1,2,3,4,5,7 },
};
int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
const uint8_t **pp, const uint8_t *desc_list_end,
Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
MpegTSContext *ts)
{
const uint8_t *desc_end;
int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
char language[252];
int i;
desc_tag = get8(pp, desc_list_end);
if (desc_tag < 0)
return AVERROR_INVALIDDATA;
desc_len = get8(pp, desc_list_end);
if (desc_len < 0)
return AVERROR_INVALIDDATA;
desc_end = *pp + desc_len;
if (desc_end > desc_list_end)
return AVERROR_INVALIDDATA;
av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
if ((st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
stream_type == STREAM_TYPE_PRIVATE_DATA)
mpegts_find_stream_type(st, desc_tag, DESC_types);
switch (desc_tag) {
case 0x1E: /* SL descriptor */
desc_es_id = get16(pp, desc_end);
if (desc_es_id < 0)
break;
if (ts && ts->pids[pid])
ts->pids[pid]->es_id = desc_es_id;
for (i = 0; i < mp4_descr_count; i++)
if (mp4_descr[i].dec_config_descr_len &&
mp4_descr[i].es_id == desc_es_id) {
AVIOContext pb;
ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
mp4_descr[i].dec_config_descr_len, 0,
NULL, NULL, NULL, NULL);
ff_mp4_read_dec_config_descr(fc, st, &pb);
if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
st->codecpar->extradata_size > 0) {
st->need_parsing = 0;
st->internal->need_context_update = 1;
}
if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
}
break;
case 0x1F: /* FMC descriptor */
if (get16(pp, desc_end) < 0)
break;
if (mp4_descr_count > 0 &&
(st->codecpar->codec_id == AV_CODEC_ID_AAC_LATM ||
(st->request_probe == 0 && st->codecpar->codec_id == AV_CODEC_ID_NONE) ||
st->request_probe > 0) &&
mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
AVIOContext pb;
ffio_init_context(&pb, mp4_descr->dec_config_descr,
mp4_descr->dec_config_descr_len, 0,
NULL, NULL, NULL, NULL);
ff_mp4_read_dec_config_descr(fc, st, &pb);
if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
st->codecpar->extradata_size > 0) {
st->request_probe = st->need_parsing = 0;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->internal->need_context_update = 1;
}
}
break;
case 0x56: /* DVB teletext descriptor */
{
uint8_t *extradata = NULL;
int language_count = desc_len / 5;
if (desc_len > 0 && desc_len % 5 != 0)
return AVERROR_INVALIDDATA;
if (language_count > 0) {
/* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
av_assert0(language_count <= sizeof(language) / 4);
if (st->codecpar->extradata == NULL) {
if (ff_alloc_extradata(st->codecpar, language_count * 2)) {
return AVERROR(ENOMEM);
}
}
if (st->codecpar->extradata_size < language_count * 2)
return AVERROR_INVALIDDATA;
extradata = st->codecpar->extradata;
for (i = 0; i < language_count; i++) {
language[i * 4 + 0] = get8(pp, desc_end);
language[i * 4 + 1] = get8(pp, desc_end);
language[i * 4 + 2] = get8(pp, desc_end);
language[i * 4 + 3] = ',';
memcpy(extradata, *pp, 2);
extradata += 2;
*pp += 2;
}
language[i * 4 - 1] = 0;
av_dict_set(&st->metadata, "language", language, 0);
st->internal->need_context_update = 1;
}
}
break;
case 0x59: /* subtitling descriptor */
{
/* 8 bytes per DVB subtitle substream data:
* ISO_639_language_code (3 bytes),
* subtitling_type (1 byte),
* composition_page_id (2 bytes),
* ancillary_page_id (2 bytes) */
int language_count = desc_len / 8;
if (desc_len > 0 && desc_len % 8 != 0)
return AVERROR_INVALIDDATA;
if (language_count > 1) {
avpriv_request_sample(fc, "DVB subtitles with multiple languages");
}
if (language_count > 0) {
uint8_t *extradata;
/* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
av_assert0(language_count <= sizeof(language) / 4);
if (st->codecpar->extradata == NULL) {
if (ff_alloc_extradata(st->codecpar, language_count * 5)) {
return AVERROR(ENOMEM);
}
}
if (st->codecpar->extradata_size < language_count * 5)
return AVERROR_INVALIDDATA;
extradata = st->codecpar->extradata;
for (i = 0; i < language_count; i++) {
language[i * 4 + 0] = get8(pp, desc_end);
language[i * 4 + 1] = get8(pp, desc_end);
language[i * 4 + 2] = get8(pp, desc_end);
language[i * 4 + 3] = ',';
/* hearing impaired subtitles detection using subtitling_type */
switch (*pp[0]) {
case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
break;
}
extradata[4] = get8(pp, desc_end); /* subtitling_type */
memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
extradata += 5;
*pp += 4;
}
language[i * 4 - 1] = 0;
av_dict_set(&st->metadata, "language", language, 0);
st->internal->need_context_update = 1;
}
}
break;
case 0x0a: /* ISO 639 language descriptor */
for (i = 0; i + 4 <= desc_len; i += 4) {
language[i + 0] = get8(pp, desc_end);
language[i + 1] = get8(pp, desc_end);
language[i + 2] = get8(pp, desc_end);
language[i + 3] = ',';
switch (get8(pp, desc_end)) {
case 0x01:
st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
break;
case 0x02:
st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
break;
case 0x03:
st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
break;
}
}
if (i && language[0]) {
language[i - 1] = 0;
av_dict_set(&st->metadata, "language", language, 0);
}
break;
case 0x05: /* registration descriptor */
st->codecpar->codec_tag = bytestream_get_le32(pp);
av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codecpar->codec_tag);
if (st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) {
mpegts_find_stream_type(st, st->codecpar->codec_tag, REGD_types);
if (st->codecpar->codec_tag == MKTAG('B', 'S', 'S', 'D'))
st->request_probe = 50;
}
break;
case 0x52: /* stream identifier descriptor */
st->stream_identifier = 1 + get8(pp, desc_end);
break;
case 0x26: /* metadata descriptor */
if (get16(pp, desc_end) == 0xFFFF)
*pp += 4;
if (get8(pp, desc_end) == 0xFF) {
st->codecpar->codec_tag = bytestream_get_le32(pp);
if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
mpegts_find_stream_type(st, st->codecpar->codec_tag, METADATA_types);
}
break;
case 0x7f: /* DVB extension descriptor */
ext_desc_tag = get8(pp, desc_end);
if (ext_desc_tag < 0)
return AVERROR_INVALIDDATA;
if (st->codecpar->codec_id == AV_CODEC_ID_OPUS &&
ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
if (!st->codecpar->extradata) {
st->codecpar->extradata = av_mallocz(sizeof(opus_default_extradata) +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!st->codecpar->extradata)
return AVERROR(ENOMEM);
st->codecpar->extradata_size = sizeof(opus_default_extradata);
memcpy(st->codecpar->extradata, opus_default_extradata, sizeof(opus_default_extradata));
channel_config_code = get8(pp, desc_end);
if (channel_config_code < 0)
return AVERROR_INVALIDDATA;
if (channel_config_code <= 0x8) {
st->codecpar->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
st->codecpar->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
st->codecpar->extradata[19] = opus_stream_cnt[channel_config_code];
st->codecpar->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
memcpy(&st->codecpar->extradata[21], opus_channel_map[channels - 1], channels);
} else {
avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
}
st->need_parsing = AVSTREAM_PARSE_FULL;
st->internal->need_context_update = 1;
}
}
break;
default:
break;
}
*pp = desc_end;
return 0;
}
static int is_pes_stream(int stream_type, uint32_t prog_reg_desc)
{
return !(stream_type == 0x13 ||
(stream_type == 0x86 && prog_reg_desc == AV_RL32("CUEI")) );
}
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
{
MpegTSContext *ts = filter->u.section_filter.opaque;
MpegTSSectionFilter *tssf = &filter->u.section_filter;
SectionHeader h1, *h = &h1;
PESContext *pes;
AVStream *st;
const uint8_t *p, *p_end, *desc_list_end;
int program_info_length, pcr_pid, pid, stream_type;
int desc_list_len;
uint32_t prog_reg_desc = 0; /* registration descriptor */
int mp4_descr_count = 0;
Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
int i;
av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
hex_dump_debug(ts->stream, section, section_len);
p_end = section + section_len - 4;
p = section;
if (parse_section_header(h, &p, p_end) < 0)
return;
if (skip_identical(h, tssf))
return;
av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d version=%d tid=%d\n",
h->id, h->sec_num, h->last_sec_num, h->version, h->tid);
if (h->tid != PMT_TID)
return;
if (!ts->scan_all_pmts && ts->skip_changes)
return;
if (!ts->skip_clear)
clear_program(ts, h->id);
pcr_pid = get16(&p, p_end);
if (pcr_pid < 0)
return;
pcr_pid &= 0x1fff;
add_pid_to_pmt(ts, h->id, pcr_pid);
set_pcr_pid(ts->stream, h->id, pcr_pid);
av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
program_info_length = get16(&p, p_end);
if (program_info_length < 0)
return;
program_info_length &= 0xfff;
while (program_info_length >= 2) {
uint8_t tag, len;
tag = get8(&p, p_end);
len = get8(&p, p_end);
av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
if (len > program_info_length - 2)
// something else is broken, exit the program_descriptors_loop
break;
program_info_length -= len + 2;
if (tag == 0x1d) { // IOD descriptor
get8(&p, p_end); // scope
get8(&p, p_end); // label
len -= 2;
mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
&mp4_descr_count, MAX_MP4_DESCR_COUNT);
} else 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)
goto out;
// stop parsing after pmt, we found header
if (!ts->stream->nb_streams)
ts->stop_parse = 2;
set_pmt_found(ts, h->id);
for (;;) {
st = 0;
pes = NULL;
stream_type = get8(&p, p_end);
if (stream_type < 0)
break;
pid = get16(&p, p_end);
if (pid < 0)
goto out;
pid &= 0x1fff;
if (pid == ts->current_pid)
goto out;
/* now create stream */
if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
pes = ts->pids[pid]->u.pes_filter.opaque;
if (!pes->st) {
pes->st = avformat_new_stream(pes->stream, NULL);
if (!pes->st)
goto out;
pes->st->id = pes->pid;
}
st = pes->st;
} else if (is_pes_stream(stream_type, prog_reg_desc)) {
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 = avformat_new_stream(pes->stream, NULL);
if (!st)
goto out;
st->id = pes->pid;
}
} else {
int idx = ff_find_stream_index(ts->stream, pid);
if (idx >= 0) {
st = ts->stream->streams[idx];
} else {
st = avformat_new_stream(ts->stream, NULL);
if (!st)
goto out;
st->id = pid;
st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
if (stream_type == 0x86 && prog_reg_desc == AV_RL32("CUEI")) {
mpegts_find_stream_type(st, stream_type, SCTE_types);
mpegts_open_section_filter(ts, pid, scte_data_cb, ts, 1);
}
}
}
if (!st)
goto out;
if (pes && !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);
if (desc_list_len < 0)
goto out;
desc_list_len &= 0xfff;
desc_list_end = p + desc_list_len;
if (desc_list_end > p_end)
goto out;
for (;;) {
if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
desc_list_end, mp4_descr,
mp4_descr_count, pid, ts) < 0)
break;
if (pes && 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->codecpar->codec_tag = st->codecpar->codec_tag;
}
}
p = desc_list_end;
}
if (!ts->pids[pcr_pid])
mpegts_open_pcr_filter(ts, pcr_pid);
out:
for (i = 0; i < mp4_descr_count; i++)
av_free(mp4_descr[i].dec_config_descr);
}
static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
{
MpegTSContext *ts = filter->u.section_filter.opaque;
MpegTSSectionFilter *tssf = &filter->u.section_filter;
SectionHeader h1, *h = &h1;
const uint8_t *p, *p_end;
int sid, pmt_pid;
AVProgram *program;
av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
hex_dump_debug(ts->stream, section, section_len);
p_end = section + section_len - 4;
p = section;
if (parse_section_header(h, &p, p_end) < 0)
return;
if (h->tid != PAT_TID)
return;
if (ts->skip_changes)
return;
if (skip_identical(h, tssf))
return;
ts->stream->ts_id = h->id;
clear_programs(ts);
for (;;) {
sid = get16(&p, p_end);
if (sid < 0)
break;
pmt_pid = get16(&p, p_end);
if (pmt_pid < 0)
break;
pmt_pid &= 0x1fff;
if (pmt_pid == ts->current_pid)
break;
av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
if (sid == 0x0000) {
/* NIT info */
} else {
MpegTSFilter *fil = ts->pids[pmt_pid];
program = av_new_program(ts->stream, sid);
if (program) {
program->program_num = sid;
program->pmt_pid = pmt_pid;
}
if (fil)
if ( fil->type != MPEGTS_SECTION
|| fil->pid != pmt_pid
|| fil->u.section_filter.section_cb != pmt_cb)
mpegts_close_filter(ts, ts->pids[pmt_pid]);
if (!ts->pids[pmt_pid])
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);
}
}
if (sid < 0) {
int i,j;
for (j=0; j<ts->stream->nb_programs; j++) {
for (i = 0; i < ts->nb_prg; i++)
if (ts->prg[i].id == ts->stream->programs[j]->id)
break;
if (i==ts->nb_prg && !ts->skip_clear)
clear_avprogram(ts, ts->stream->programs[j]->id);
}
}
}
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
{
MpegTSContext *ts = filter->u.section_filter.opaque;
MpegTSSectionFilter *tssf = &filter->u.section_filter;
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;
av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
hex_dump_debug(ts->stream, section, section_len);
p_end = section + section_len - 4;
p = section;
if (parse_section_header(h, &p, p_end) < 0)
return;
if (h->tid != SDT_TID)
return;
if (ts->skip_changes)
return;
if (skip_identical(h, tssf))
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);
if (desc_list_len < 0)
break;
desc_list_len &= 0xfff;
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_len < 0 || desc_end > desc_list_end)
break;
av_log(ts->stream, AV_LOG_TRACE, "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_dict_set(&program->metadata, "service_name", name, 0);
av_dict_set(&program->metadata, "service_provider",
provider_name, 0);
}
}
av_free(name);
av_free(provider_name);
break;
default:
break;
}
p = desc_end;
}
p = desc_list_end;
}
}
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
const uint8_t *packet);
/* handle one TS packet */
static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
{
MpegTSFilter *tss;
int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
has_adaptation, has_payload;
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 && is_start) {
add_pes_stream(ts, pid, -1);
tss = ts->pids[pid];
}
if (!tss)
return 0;
ts->current_pid = pid;
afc = (packet[3] >> 4) & 3;
if (afc == 0) /* reserved value */
return 0;
has_adaptation = afc & 2;
has_payload = afc & 1;
is_discontinuity = has_adaptation &&
packet[4] != 0 && /* with length > 0 */
(packet[5] & 0x80); /* and discontinuity indicated */
/* continuity check (currently not used) */
cc = (packet[3] & 0xf);
expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
cc_ok = pid == 0x1FFF || // null packet PID
is_discontinuity ||
tss->last_cc < 0 ||
expected_cc == cc;
tss->last_cc = cc;
if (!cc_ok) {
av_log(ts->stream, AV_LOG_DEBUG,
"Continuity check failed for pid %d expected %d got %d\n",
pid, expected_cc, cc);
if (tss->type == MPEGTS_PES) {
PESContext *pc = tss->u.pes_filter.opaque;
pc->flags |= AV_PKT_FLAG_CORRUPT;
}
}
p = packet + 4;
if (has_adaptation) {
int64_t pcr_h;
int pcr_l;
if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
tss->last_pcr = pcr_h * 300 + pcr_l;
/* skip adaptation field */
p += p[0] + 1;
}
/* if past the end of packet, ignore */
p_end = packet + TS_PACKET_SIZE;
if (p >= p_end || !has_payload)
return 0;
pos = avio_tell(ts->stream->pb);
if (pos >= 0) {
av_assert0(pos >= TS_PACKET_SIZE);
ts->pos47_full = pos - TS_PACKET_SIZE;
}
if (tss->type == MPEGTS_SECTION) {
if (is_start) {
/* pointer field present */
len = *p++;
if (len > p_end - p)
return 0;
if (len && cc_ok) {
/* write remaining section bytes */
write_section_data(ts, 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(ts, tss,
p, p_end - p, 1);
}
} else {
if (cc_ok) {
write_section_data(ts, tss,
p, p_end - p, 0);
}
}
// stop find_stream_info from waiting for more streams
// when all programs have received a PMT
if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
int i;
for (i = 0; i < ts->nb_prg; i++) {
if (!ts->prg[i].pmt_found)
break;
}
if (i == ts->nb_prg && ts->nb_prg > 0) {
int types = 0;
for (i = 0; i < ts->stream->nb_streams; i++) {
AVStream *st = ts->stream->streams[i];
if (st->codecpar->codec_type >= 0)
types |= 1<<st->codecpar->codec_type;
}
if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
}
}
}
} else {
int ret;
// Note: The position here points actually behind the current packet.
if (tss->type == MPEGTS_PES) {
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;
}
static void reanalyze(MpegTSContext *ts) {
AVIOContext *pb = ts->stream->pb;
int64_t pos = avio_tell(pb);
if (pos < 0)
return;
pos -= ts->pos47_full;
if (pos == TS_PACKET_SIZE) {
ts->size_stat[0] ++;
} else if (pos == TS_DVHS_PACKET_SIZE) {
ts->size_stat[1] ++;
} else if (pos == TS_FEC_PACKET_SIZE) {
ts->size_stat[2] ++;
}
ts->size_stat_count ++;
if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
int newsize = 0;
if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
newsize = TS_PACKET_SIZE;
} else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
newsize = TS_DVHS_PACKET_SIZE;
} else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
newsize = TS_FEC_PACKET_SIZE;
}
if (newsize && newsize != ts->raw_packet_size) {
av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
ts->raw_packet_size = newsize;
}
ts->size_stat_count = 0;
memset(ts->size_stat, 0, sizeof(ts->size_stat));
}
}
/* XXX: try to find a better synchro over several packets (use
* get_packet_size() ?) */
static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *current_packet)
{
MpegTSContext *ts = s->priv_data;
AVIOContext *pb = s->pb;
int c, i;
uint64_t pos = avio_tell(pb);
avio_seek(pb, -FFMIN(seekback, pos), SEEK_CUR);
//Special case for files like 01c56b0dc1.ts
if (current_packet[0] == 0x80 && current_packet[12] == 0x47) {
avio_seek(pb, 12, SEEK_CUR);
return 0;
}
for (i = 0; i < ts->resync_size; i++) {
c = avio_r8(pb);
if (avio_feof(pb))
return AVERROR_EOF;
if (c == 0x47) {
avio_seek(pb, -1, SEEK_CUR);
reanalyze(s->priv_data);
return 0;
}
}
av_log(s, AV_LOG_ERROR,
"max resync size reached, could not find sync byte\n");
/* no sync found */
return AVERROR_INVALIDDATA;
}
/* return AVERROR_something if error or EOF. Return 0 if OK. */
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
const uint8_t **data)
{
AVIOContext *pb = s->pb;
int len;
for (;;) {
len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
if (len != TS_PACKET_SIZE)
return len < 0 ? len : AVERROR_EOF;
/* check packet sync byte */
if ((*data)[0] != 0x47) {
/* find a new packet start */
if (mpegts_resync(s, raw_packet_size, *data) < 0)
return AVERROR(EAGAIN);
else
continue;
} else {
break;
}
}
return 0;
}
static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
{
AVIOContext *pb = s->pb;
int skip = raw_packet_size - TS_PACKET_SIZE;
if (skip > 0)
avio_skip(pb, skip);
}
static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
{
AVFormatContext *s = ts->stream;
uint8_t packet[TS_PACKET_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
const uint8_t *data;
int64_t packet_num;
int ret = 0;
if (avio_tell(s->pb) != ts->last_pos) {
int i;
av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
/* seek detected, flush pes buffer */
for (i = 0; i < NB_PID_MAX; i++) {
if (ts->pids[i]) {
if (ts->pids[i]->type == MPEGTS_PES) {
PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
av_buffer_unref(&pes->buffer);
pes->data_index = 0;
pes->state = MPEGTS_SKIP; /* skip until pes header */
} else if (ts->pids[i]->type == MPEGTS_SECTION) {
ts->pids[i]->u.section_filter.last_ver = -1;
}
ts->pids[i]->last_cc = -1;
ts->pids[i]->last_pcr = -1;
}
}
}
ts->stop_parse = 0;
packet_num = 0;
memset(packet + TS_PACKET_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
for (;;) {
packet_num++;
if (nb_packets != 0 && packet_num >= nb_packets ||
ts->stop_parse > 1) {
ret = AVERROR(EAGAIN);
break;
}
if (ts->stop_parse > 0)
break;
ret = read_packet(s, packet, ts->raw_packet_size, &data);
if (ret != 0)
break;
ret = handle_packet(ts, data);
finished_reading_packet(s, ts->raw_packet_size);
if (ret != 0)
break;
}
ts->last_pos = avio_tell(s->pb);
return ret;
}
static int mpegts_probe(AVProbeData *p)
{
const int size = p->buf_size;
int maxscore = 0;
int sumscore = 0;
int i;
int check_count = size / TS_FEC_PACKET_SIZE;
#define CHECK_COUNT 10
#define CHECK_BLOCK 100
if (!check_count)
return 0;
for (i = 0; i<check_count; i+=CHECK_BLOCK) {
int left = FFMIN(check_count - i, CHECK_BLOCK);
int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , 1);
int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, 1);
int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , 1);
score = FFMAX3(score, dvhs_score, fec_score);
sumscore += score;
maxscore = FFMAX(maxscore, score);
}
sumscore = sumscore * CHECK_COUNT / check_count;
maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
ff_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
if (check_count > CHECK_COUNT && sumscore > 6) {
return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
} else if (check_count >= CHECK_COUNT && sumscore > 6) {
return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
} else if (check_count >= CHECK_COUNT && maxscore > 6) {
return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
} else if (sumscore > 6) {
return 2;
} else {
return 0;
}
}
/* 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 AVERROR_INVALIDDATA;
p = packet + 4;
len = p[0];
p++;
if (len == 0)
return AVERROR_INVALIDDATA;
flags = *p++;
len--;
if (!(flags & 0x10))
return AVERROR_INVALIDDATA;
if (len < 6)
return AVERROR_INVALIDDATA;
v = AV_RB32(p);
*ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
*ppcr_low = ((p[4] & 1) << 8) | p[5];
return 0;
}
static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
/* NOTE: We attempt to seek on non-seekable files as well, as the
* probe buffer usually is big enough. Only warn if the seek failed
* on files where the seek should work. */
if (avio_seek(pb, pos, SEEK_SET) < 0)
av_log(s, (pb->seekable & AVIO_SEEKABLE_NORMAL) ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
}
static int mpegts_read_header(AVFormatContext *s)
{
MpegTSContext *ts = s->priv_data;
AVIOContext *pb = s->pb;
uint8_t buf[8 * 1024] = {0};
int len;
int64_t pos, probesize = s->probesize;
s->internal->prefer_codec_framerate = 1;
if (ffio_ensure_seekback(pb, probesize) < 0)
av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
/* read the first 8192 bytes to get packet size */
pos = avio_tell(pb);
len = avio_read(pb, buf, sizeof(buf));
ts->raw_packet_size = get_packet_size(buf, len);
if (ts->raw_packet_size <= 0) {
av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
ts->raw_packet_size = TS_PACKET_SIZE;
}
ts->stream = s;
ts->auto_guess = 0;
if (s->iformat == &ff_mpegts_demuxer) {
/* normal demux */
/* first do a scan to get all the services */
seek_back(s, pb, pos);
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, probesize / ts->raw_packet_size);
/* if could not find service, enable auto_guess */
ts->auto_guess = 1;
av_log(ts->stream, AV_LOG_TRACE, "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];
const uint8_t *data;
/* only read packets */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 60, 1, 27000000);
st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
st->codecpar->codec_id = AV_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, &data);
if (ret < 0)
return ret;
pid = AV_RB16(data + 1) & 0x1fff;
if ((pcr_pid == -1 || pcr_pid == pid) &&
parse_pcr(&pcr_h, &pcr_l, data) == 0) {
finished_reading_packet(s, ts->raw_packet_size);
pcr_pid = pid;
packet_count[nb_pcrs] = nb_packets;
pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
nb_pcrs++;
if (nb_pcrs >= 2) {
if (pcrs[1] - pcrs[0] > 0) {
/* the difference needs to be positive to make sense for bitrate computation */
break;
} else {
av_log(ts->stream, AV_LOG_WARNING, "invalid pcr pair %"PRId64" >= %"PRId64"\n", pcrs[0], pcrs[1]);
pcrs[0] = pcrs[1];
packet_count[0] = packet_count[1];
nb_pcrs--;
}
}
} else {
finished_reading_packet(s, ts->raw_packet_size);
}
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 * 27000000LL / ts->pcr_incr;
st->codecpar->bit_rate = s->bit_rate;
st->start_time = ts->cur_pcr;
av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%d\n",
st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
}
seek_back(s, pb, pos);
return 0;
}
#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];
const uint8_t *data;
if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
return AVERROR(ENOMEM);
ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
pkt->pos = avio_tell(s->pb);
if (ret < 0) {
av_packet_unref(pkt);
return ret;
}
if (data != pkt->data)
memcpy(pkt->data, data, ts->raw_packet_size);
finished_reading_packet(s, ts->raw_packet_size);
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 = avio_tell(s->pb);
for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
avio_read(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;
}
}
avio_seek(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;
pkt->size = -1;
ts->pkt = pkt;
ret = handle_packets(ts, 0);
if (ret < 0) {
av_packet_unref(ts->pkt);
/* 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) {
ret = new_pes_packet(pes, pkt);
if (ret < 0)
return ret;
pes->state = MPEGTS_SKIP;
ret = 0;
break;
}
}
}
if (!ret && pkt->size < 0)
ret = AVERROR_INVALIDDATA;
return ret;
}
static void mpegts_free(MpegTSContext *ts)
{
int i;
clear_programs(ts);
for (i = 0; i < NB_PID_MAX; i++)
if (ts->pids[i])
mpegts_close_filter(ts, ts->pids[i]);
}
static int mpegts_read_close(AVFormatContext *s)
{
MpegTSContext *ts = s->priv_data;
mpegts_free(ts);
return 0;
}
static av_unused 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;
int pos47 = ts->pos47_full % ts->raw_packet_size;
pos =
((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
ts->raw_packet_size + pos47;
while(pos < pos_limit) {
if (avio_seek(s->pb, pos, SEEK_SET) < 0)
return AV_NOPTS_VALUE;
if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
return AV_NOPTS_VALUE;
if (buf[0] != 0x47) {
if (mpegts_resync(s, TS_PACKET_SIZE, buf) < 0)
return AV_NOPTS_VALUE;
pos = avio_tell(s->pb);
continue;
}
if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
parse_pcr(&timestamp, &pcr_l, buf) == 0) {
*ppos = pos;
return timestamp;
}
pos += ts->raw_packet_size;
}
return AV_NOPTS_VALUE;
}
static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
int64_t *ppos, int64_t pos_limit)
{
MpegTSContext *ts = s->priv_data;
int64_t pos;
int pos47 = ts->pos47_full % ts->raw_packet_size;
pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
ff_read_frame_flush(s);
if (avio_seek(s->pb, pos, SEEK_SET) < 0)
return AV_NOPTS_VALUE;
while(pos < pos_limit) {
int ret;
AVPacket pkt;
av_init_packet(&pkt);
ret = av_read_frame(s, &pkt);
if (ret < 0)
return AV_NOPTS_VALUE;
if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
ff_reduce_index(s, pkt.stream_index);
av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
int64_t dts = pkt.dts;
*ppos = pkt.pos;
av_packet_unref(&pkt);
return dts;
}
}
pos = pkt.pos;
av_packet_unref(&pkt);
}
return AV_NOPTS_VALUE;
}
/**************************************************************/
/* parsing functions - called from other demuxers such as RTP */
MpegTSContext *avpriv_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;
mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
return ts;
}
/* return the consumed length if a packet was output, or -1 if no
* packet is output */
int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
const uint8_t *buf, int len)
{
int len1;
len1 = len;
ts->pkt = pkt;
for (;;) {
ts->stop_parse = 0;
if (len < TS_PACKET_SIZE)
return AVERROR_INVALIDDATA;
if (buf[0] != 0x47) {
buf++;
len--;
} else {
handle_packet(ts, buf);
buf += TS_PACKET_SIZE;
len -= TS_PACKET_SIZE;
if (ts->stop_parse == 1)
break;
}
}
return len1 - len;
}
void avpriv_mpegts_parse_close(MpegTSContext *ts)
{
mpegts_free(ts);
av_free(ts);
}
AVInputFormat ff_mpegts_demuxer = {
.name = "mpegts",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
.priv_data_size = sizeof(MpegTSContext),
.read_probe = mpegts_probe,
.read_header = mpegts_read_header,
.read_packet = mpegts_read_packet,
.read_close = mpegts_read_close,
.read_timestamp = mpegts_get_dts,
.flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
.priv_class = &mpegts_class,
};
AVInputFormat ff_mpegtsraw_demuxer = {
.name = "mpegtsraw",
.long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
.priv_data_size = sizeof(MpegTSContext),
.read_header = mpegts_read_header,
.read_packet = mpegts_raw_read_packet,
.read_close = mpegts_read_close,
.read_timestamp = mpegts_get_dts,
.flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
.priv_class = &mpegtsraw_class,
};
Reference in New Issue View Git Blame Copy Permalink