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FFmpeg/libavformat/mpegts.c
Gabriel Dume f929ab0569 cosmetics: Write NULL pointer equality checks more compactly 
Signed-off-by: Diego Biurrun <diego@biurrun.de>
2014-08-15 03:18:18 -07:00

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/*
* MPEG2 transport stream (aka DVB) demuxer
* Copyright (c) 2002-2003 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.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
#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,
};
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;
/** position corresponding to pos47, or 0 if pos47 invalid */
int64_t pos;
/** 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,
{ .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 = 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];
AVBufferRef *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;
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;
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;
}
/**
* @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) {
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_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 *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] & 0x30)) {
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 AVERROR_INVALIDDATA;
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_dlog(NULL, "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 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 ((p + 1) >= p_end)
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 ((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 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 {
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 },
{ 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
{ 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
{ 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*/
{ 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
{ 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('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
{ MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
{ 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) {
st->codec->codec_type = types->codec_type;
st->codec->codec_id = types->codec_id;
return;
}
}
static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
uint32_t stream_type, uint32_t prog_reg_desc)
{
avpriv_set_pts_info(st, 33, 1, 90000);
st->priv_data = pes;
st->codec->codec_type = AVMEDIA_TYPE_DATA;
st->codec->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->codec->codec_tag = pes->stream_type;
mpegts_find_stream_type(st, pes->stream_type, ISO_types);
if (prog_reg_desc == AV_RL32("HDMV") &&
st->codec->codec_id == 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->codec->codec_type = AVMEDIA_TYPE_AUDIO;
sub_st->codec->codec_id = AV_CODEC_ID_AC3;
sub_st->need_parsing = AVSTREAM_PARSE_FULL;
sub_pes->sub_st = pes->sub_st = sub_st;
}
}
if (st->codec->codec_id == AV_CODEC_ID_NONE)
mpegts_find_stream_type(st, pes->stream_type, MISC_types);
return 0;
}
static void new_pes_packet(PESContext *pes, AVPacket *pkt)
{
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, 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 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 &&
(!pes->sub_st ||
pes->sub_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_buffer_alloc(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 == AV_CODEC_ID_NONE) {
av_dlog(pes->stream,
"pid=%x stream_type=%x probing\n",
pes->pid,
pes->stream_type);
pes->st->codec->codec_id = AV_CODEC_ID_PROBE;
}
} else {
pes->state = MPEGTS_PAYLOAD;
pes->data_index = 0;
}
} else {
/* otherwise, it should be a table */
/* skip packet */
skip:
pes->state = MPEGTS_SKIP;
continue;
}
}
break;
/**********************************************/
/* PES packing parsing */
case MPEGTS_PESHEADER:
len = PES_HEADER_SIZE - pes->data_index;
if (len < 0)
return 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;
}
}
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_buffer_alloc(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->data + 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;
} 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;
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);
parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
update_offsets(&d->pb, &off, &len);
if (len > 0)
parse_mp4_descr(d, off, len, MP4SLDescrTag);
d->active_descr = NULL;
return 0;
}
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;
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);
descr->sl.timestamp_len = avio_r8(&d->pb);
descr->sl.ocr_len = avio_r8(&d->pb);
descr->sl.au_len = avio_r8(&d->pb);
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 {
avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
}
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);
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");
goto done;
}
if (target_tag && tag != target_tag) {
av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
target_tag);
goto done;
}
switch (tag) {
case MP4IODescrTag:
parse_MP4IODescrTag(d, off, len1);
break;
case MP4ODescrTag:
parse_MP4ODescrTag(d, off, len1);
break;
case MP4ESDescrTag:
parse_MP4ESDescrTag(d, off, len1);
break;
case MP4DecConfigDescrTag:
parse_MP4DecConfigDescrTag(d, off, len1);
break;
case MP4SLDescrTag:
parse_MP4SLDescrTag(d, off, len1);
break;
}
done:
d->level--;
avio_seek(&d->pb, off + len1, SEEK_SET);
return 0;
}
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;
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;
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] && 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->codec->codec_id == AV_CODEC_ID_AAC &&
st->codec->extradata_size > 0)
st->need_parsing = 0;
if (st->codec->codec_id == AV_CODEC_ID_H264 &&
st->codec->extradata_size > 0)
st->need_parsing = 0;
if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
// do nothing
} else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
}
}
for (i = 0; i < mp4_descr_count; i++)
av_free(mp4_descr[i].dec_config_descr);
}
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;
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_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
if (st->codec->codec_id == AV_CODEC_ID_NONE &&
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 (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->codec->codec_id == AV_CODEC_ID_AAC &&
st->codec->extradata_size > 0)
st->need_parsing = 0;
if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
}
break;
case 0x1F: /* FMC descriptor */
get16(pp, desc_end);
if (mp4_descr_count > 0 &&
st->codec->codec_id == AV_CODEC_ID_AAC_LATM &&
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->codec->codec_id == AV_CODEC_ID_AAC &&
st->codec->extradata_size > 0)
st->need_parsing = 0;
}
break;
case 0x56: /* DVB teletext descriptor */
language[0] = get8(pp, desc_end);
language[1] = get8(pp, desc_end);
language[2] = get8(pp, desc_end);
language[3] = 0;
av_dict_set(&st->metadata, "language", language, 0);
break;
case 0x59: /* subtitling descriptor */
language[0] = get8(pp, desc_end);
language[1] = get8(pp, desc_end);
language[2] = get8(pp, desc_end);
language[3] = 0;
/* hearing impaired subtitles detection */
switch (get8(pp, desc_end)) {
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;
}
if (st->codec->extradata) {
if (st->codec->extradata_size == 4 &&
memcmp(st->codec->extradata, *pp, 4))
avpriv_request_sample(fc, "DVB sub with multiple IDs");
} else {
st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
if (st->codec->extradata) {
st->codec->extradata_size = 4;
memcpy(st->codec->extradata, *pp, 4);
}
}
*pp += 4;
av_dict_set(&st->metadata, "language", language, 0);
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->codec->codec_tag = bytestream_get_le32(pp);
av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
if (st->codec->codec_id == AV_CODEC_ID_NONE)
mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
break;
default:
break;
}
*pp = desc_end;
return 0;
}
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
{
MpegTSContext *ts = filter->u.section_filter.opaque;
SectionHeader h1, *h = &h1;
PESContext *pes;
AVStream *st;
const uint8_t *p, *p_end, *desc_list_end;
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_dlog(ts->stream, "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;
av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
h->id, h->sec_num, h->last_sec_num);
if (h->tid != PMT_TID)
return;
clear_program(ts, h->id);
pcr_pid = get16(&p, p_end);
if (pcr_pid < 0)
return;
pcr_pid &= 0x1fff;
add_pid_to_pmt(ts, h->id, pcr_pid);
av_dlog(ts->stream, "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_dlog(ts->stream, "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 = 1;
for (;;) {
st = 0;
pes = NULL;
stream_type = get8(&p, p_end);
if (stream_type < 0)
break;
pid = get16(&p, p_end);
if (pid < 0)
break;
pid &= 0x1fff;
/* 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);
pes->st->id = pes->pid;
}
st = pes->st;
} else if (stream_type != 0x13) {
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);
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);
st->id = pid;
st->codec->codec_type = AVMEDIA_TYPE_DATA;
}
}
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);
ff_program_add_stream_index(ts->stream, h->id, st->index);
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 (;;) {
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) {
ff_program_add_stream_index(ts->stream, h->id,
pes->sub_st->index);
pes->sub_st->codec->codec_tag = st->codec->codec_tag;
}
}
p = desc_list_end;
}
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;
SectionHeader h1, *h = &h1;
const uint8_t *p, *p_end;
int sid, pmt_pid;
av_dlog(ts->stream, "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;
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;
av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
if (sid == 0x0000) {
/* NIT info */
} else {
av_new_program(ts->stream, sid);
if (ts->pids[pmt_pid])
mpegts_close_filter(ts, 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);
}
}
}
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
{
MpegTSContext *ts = filter->u.section_filter.opaque;
SectionHeader h1, *h = &h1;
const uint8_t *p, *p_end, *desc_list_end, *desc_end;
int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
char *name, *provider_name;
av_dlog(ts->stream, "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;
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_end > desc_list_end)
break;
av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
desc_tag, desc_len);
switch (desc_tag) {
case 0x48:
service_type = get8(&p, p_end);
if (service_type < 0)
break;
provider_name = getstr8(&p, p_end);
if (!provider_name)
break;
name = getstr8(&p, p_end);
if (name) {
AVProgram *program = av_new_program(ts->stream, sid);
if (program) {
av_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;
}
}
/* 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;
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_WARNING,
"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;
}
}
if (!has_payload)
return 0;
p = packet + 4;
if (has_adaptation) {
/* skip adaptation field */
p += p[0] + 1;
}
/* if past the end of packet, ignore */
p_end = packet + TS_PACKET_SIZE;
if (p >= p_end)
return 0;
pos = avio_tell(ts->stream->pb);
MOD_UNLIKELY(ts->pos47, pos, ts->raw_packet_size, ts->pos);
if (tss->type == MPEGTS_SECTION) {
if (is_start) {
/* pointer field present */
len = *p++;
if (p + len > p_end)
return 0;
if (len && cc_ok) {
/* write remaining section bytes */
write_section_data(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);
}
}
} else {
int ret;
// Note: The position here points actually behind the current packet.
if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
pos - ts->raw_packet_size)) < 0)
return ret;
}
return 0;
}
/* XXX: try to find a better synchro over several packets (use
* get_packet_size() ?) */
static int mpegts_resync(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
int c, i;
for (i = 0; i < MAX_RESYNC_SIZE; i++) {
c = avio_r8(pb);
if (pb->eof_reached)
return AVERROR_EOF;
if (c == 0x47) {
avio_seek(pb, -1, SEEK_CUR);
return 0;
}
}
av_log(s, AV_LOG_ERROR,
"max resync size reached, could not find sync byte\n");
/* no sync found */
return 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 */
avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
if (mpegts_resync(s) < 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, int nb_packets)
{
AVFormatContext *s = ts->stream;
uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
const uint8_t *data;
int packet_num, ret = 0;
if (avio_tell(s->pb) != ts->last_pos) {
int i;
av_dlog(ts->stream, "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 */
}
ts->pids[i]->last_cc = -1;
}
}
}
ts->stop_parse = 0;
packet_num = 0;
memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
for (;;) {
if (ts->stop_parse > 0)
break;
packet_num++;
if (nb_packets != 0 && packet_num >= nb_packets)
break;
ret = read_packet(s, packet, ts->raw_packet_size, &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 score, fec_score, dvhs_score;
int check_count = size / TS_FEC_PACKET_SIZE;
#define CHECK_COUNT 10
if (check_count < CHECK_COUNT)
return AVERROR_INVALIDDATA;
score = analyze(p->buf, TS_PACKET_SIZE * check_count,
TS_PACKET_SIZE, NULL) * CHECK_COUNT / check_count;
dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE * check_count,
TS_DVHS_PACKET_SIZE, NULL) * CHECK_COUNT / check_count;
fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE * check_count,
TS_FEC_PACKET_SIZE, NULL) * CHECK_COUNT / check_count;
av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
score, dvhs_score, fec_score);
/* we need a clear definition for the returned score otherwise
* things will become messy sooner or later */
if (score > fec_score && score > dvhs_score && score > 6)
return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
else if (dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6)
return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
else if (fec_score > 6)
return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
else
return AVERROR_INVALIDDATA;
}
/* 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 int mpegts_read_header(AVFormatContext *s)
{
MpegTSContext *ts = s->priv_data;
AVIOContext *pb = s->pb;
uint8_t buf[5 * 1024];
int len;
int64_t pos;
/* read the first 1024 bytes to get packet size */
pos = avio_tell(pb);
len = avio_read(pb, buf, sizeof(buf));
if (len < 0)
return len;
if (len != sizeof(buf))
return AVERROR_BUG;
ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
if (ts->raw_packet_size <= 0)
return AVERROR_INVALIDDATA;
ts->stream = s;
ts->auto_guess = 0;
if (s->iformat == &ff_mpegts_demuxer) {
/* normal demux */
/* first do a scan to get all the services */
if (avio_seek(pb, pos, SEEK_SET) < 0 && pb->seekable)
av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
handle_packets(ts, s->probesize / ts->raw_packet_size);
/* if could not find service, enable auto_guess */
ts->auto_guess = 1;
av_dlog(ts->stream, "tuning done\n");
s->ctx_flags |= AVFMTCTX_NOHEADER;
} else {
AVStream *st;
int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
int64_t pcrs[2], pcr_h;
int packet_count[2];
uint8_t packet[TS_PACKET_SIZE];
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->codec->codec_type = AVMEDIA_TYPE_DATA;
st->codec->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)
break;
} 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 * 27e6 / ts->pcr_incr;
st->codec->bit_rate = s->bit_rate;
st->start_time = ts->cur_pcr;
av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
}
avio_seek(pb, pos, SEEK_SET);
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_free_packet(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) {
/* flush pes data left */
for (i = 0; i < NB_PID_MAX; i++)
if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
new_pes_packet(pes, pkt);
pes->state = MPEGTS_SKIP;
ret = 0;
break;
}
}
}
if (!ret && pkt->size < 0)
ret = AVERROR(EINTR);
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 int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
int64_t *ppos, int64_t pos_limit)
{
MpegTSContext *ts = s->priv_data;
int64_t pos, timestamp;
uint8_t buf[TS_PACKET_SIZE];
int pcr_l, pcr_pid =
((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
const int find_next = 1;
pos =
((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) *
ts->raw_packet_size + ts->pos47;
if (find_next) {
for (;;) {
avio_seek(s->pb, pos, SEEK_SET);
if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
return AV_NOPTS_VALUE;
if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
parse_pcr(&timestamp, &pcr_l, buf) == 0) {
break;
}
pos += ts->raw_packet_size;
}
} else {
for (;;) {
pos -= ts->raw_packet_size;
if (pos < 0)
return AV_NOPTS_VALUE;
avio_seek(s->pb, pos, SEEK_SET);
if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
return AV_NOPTS_VALUE;
if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
parse_pcr(&timestamp, &pcr_l, buf) == 0) {
break;
}
}
}
*ppos = pos;
return timestamp;
}
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
{
MpegTSContext *ts = s->priv_data;
uint8_t buf[TS_PACKET_SIZE];
int64_t pos;
int ret;
ret = ff_seek_frame_binary(s, stream_index, target_ts, flags);
if (ret < 0)
return ret;
pos = avio_tell(s->pb);
for (;;) {
avio_seek(s->pb, pos, SEEK_SET);
ret = avio_read(s->pb, buf, TS_PACKET_SIZE);
if (ret < 0)
return ret;
if (ret != TS_PACKET_SIZE)
return AVERROR_EOF;
// pid = AV_RB16(buf + 1) & 0x1fff;
if (buf[1] & 0x40)
break;
pos += ts->raw_packet_size;
}
avio_seek(s->pb, pos, SEEK_SET);
return 0;
}
/**************************************************************/
/* parsing functions - called from other demuxers such as RTP */
MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
{
MpegTSContext *ts;
ts = av_mallocz(sizeof(MpegTSContext));
if (!ts)
return NULL;
/* no stream case, currently used by RTP */
ts->raw_packet_size = TS_PACKET_SIZE;
ts->stream = s;
ts->auto_guess = 1;
return ts;
}
/* return the consumed length if a packet was output, or -1 if no
* packet is output */
int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
const uint8_t *buf, int len)
{
int len1;
len1 = len;
ts->pkt = pkt;
ts->stop_parse = 0;
for (;;) {
if (ts->stop_parse > 0)
break;
if (len < TS_PACKET_SIZE)
return AVERROR_INVALIDDATA;
if (buf[0] != 0x47) {
buf++;
len--;
} else {
handle_packet(ts, buf);
buf += TS_PACKET_SIZE;
len -= TS_PACKET_SIZE;
}
}
return len1 - len;
}
void ff_mpegts_parse_close(MpegTSContext *ts)
{
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_seek = read_seek,
.read_timestamp = mpegts_get_pcr,
.flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
};
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_seek = read_seek,
.read_timestamp = mpegts_get_pcr,
.flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
.priv_class = &mpegtsraw_class,
};
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