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mpegts-mythtv.c
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mpegts-mythtv.c
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/*
* MPEG-2 transport stream (aka DVB) demuxer
* Copyright (c) 2002-2003 Fabrice Bellard
* Reworked for use with MythTV
*
* 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/common.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 "libavutil/dovi_meta.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/opus.h"
#include "avformat.h"
#include "mpegts-mythtv.h"
#include "internal.h"
#include "avio_internal.h"
#include "mpeg.h"
#include "isom.h"
#if CONFIG_ICONV
#include <iconv.h>
#endif
// MythTV only -----------------------------------------------------------------
/* from APIchanges:
2011-10-19 - d049257 / 569129a - lavf 53.17.0 / 53.10.0
Add avformat_new_stream(). Deprecate av_new_stream().
*/
static AVStream *av_new_stream(AVFormatContext *s, int id)
{
AVStream *st = avformat_new_stream(s, NULL);
if (st)
st->id = id;
return st;
}
static void av_set_pts_info(AVStream *s, int pts_wrap_bits,
unsigned int pts_num, unsigned int pts_den)
{
avpriv_set_pts_info(s, pts_wrap_bits, pts_num, pts_den);
}
/**
* av_dlog macros
* copied from libavutil/log.h since they are deprecated and removed from there
* Useful to print debug messages that shouldn't get compiled in normally.
*/
#ifdef DEBUG
# define av_dlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
#else
# define av_dlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
#endif
#define PMT_NOT_YET_FOUND 0
#define PMT_NOT_IN_PAT 1
#define PMT_FOUND 2
typedef struct SectionContext {
int pid;
int stream_type;
int new_packet;
MpegTSContext *ts;
AVFormatContext *stream;
AVStream *st;
} SectionContext;
static void mpegts_cleanup_streams(MpegTSContext *ts);
static int find_in_list(const int *pids, int pid);
static int is_pat_same(MpegTSContext *mpegts_ctx,
int *pmt_pnums, int *pmts_pids, unsigned int pmt_count);
static void mpegts_add_stream(MpegTSContext *ts, int id, pmt_entry_t* item, uint32_t prog_reg_desc, int pcr_pid);
static void mpegts_remove_stream(MpegTSContext *ts, int pid);
static int pmt_equal_streams(MpegTSContext *mpegts_ctx,
pmt_entry_t* items, int item_cnt);
/**
* @brief Remove a stream from a media stream.
*
* This is used by mpegts, so we can track streams as indicated by the PMT.
*
* @param s MPEG media stream handle
* @param id stream id of stream to remove
* @param remove_ts if true, remove any matching MPEG-TS filter as well
*/
static void av_mpegts_remove_stream(AVFormatContext *s, int id) {
int i;
int changes = 0;
for (i=0; i<s->nb_streams; i++) {
AVCodecContext *codec_ctx;
if (s->streams[i]->id != id)
continue;
av_log(NULL, AV_LOG_DEBUG, "av_mpegts_remove_stream 0x%x\n", id);
/* close codec context */
codec_ctx = s->streams[i]->codec;
if (codec_ctx->codec) {
avcodec_close(codec_ctx);
av_free(codec_ctx);
}
#if 0
/* make sure format context is not using the codec context */
if (&s->streams[i] == s->cur_st) {
av_log(NULL, AV_LOG_DEBUG, "av_mpegts_remove_stream cur_st = NULL\n");
s->cur_st = NULL;
}
#endif
/* else if (s->cur_st > &s->streams[i]) {
av_log(NULL, AV_LOG_DEBUG, "av_mpegts_remove_stream cur_st -= 1\n");
s->cur_st -= sizeof(AVFormatContext *);
} */
else {
av_log(NULL, AV_LOG_DEBUG,
"av_mpegts_remove_stream: no change to cur_st\n");
}
av_log(NULL, AV_LOG_DEBUG, "av_mpegts_remove_stream: removing... "
"s->nb_streams=%d i=%d\n", s->nb_streams, i);
/* actually remove av stream */
s->nb_streams--;
if ((s->nb_streams - i) > 0) {
memmove(&s->streams[i], &s->streams[i+1],
(s->nb_streams-i)*sizeof(AVFormatContext *));
}
else
s->streams[i] = NULL;
/* remove ts filter if remove ts is true and
* the format decoder is the "mpegts" decoder
*/
if (s->iformat && s->priv_data &&
(0 == strncmp(s->iformat->name, "mpegts", 6))) {
av_log(NULL, AV_LOG_DEBUG,
"av_mpegts_remove_stream: mpegts_remove_stream\n");
mpegts_remove_stream((MpegTSContext*) s->priv_data, id);
}
changes = 1;
}
if (changes)
{
// flush queued packets after a stream change (might need to make smarter)
mythtv_flush_packet_queue(s);
/* renumber the streams */
av_log(NULL, AV_LOG_DEBUG, "av_mpegts_remove_stream: renumbering streams\n");
for (i=0; i<s->nb_streams; i++)
s->streams[i]->index=i;
}
}
/** maximum number of PMT's we expect to be described in a PAT */
#define PAT_MAX_PMT 128
/** maximum number of streams we expect to be described in a PMT */
#define PMT_PIDS_MAX 256
// end MythTV only -------------------------------------------------------------
/* 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)
#define PROBE_PACKET_MAX_BUF 8192
#define PROBE_PACKET_MARGIN 5
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;
int discard;
enum MpegTSFilterType type;
/** if set, chop off PMT at the end of the TS packet, regardless of the
* data length given in the packet. This is for use by BBC iPlayer IPTV
* recordings which seem to only want to send the first packet of the PMT
* but give a length that requires 3 packets. Without this, those
* recordings are unplayable */
int pmt_chop_at_ts; // MythTV
union {
MpegTSPESFilter pes_filter;
MpegTSSectionFilter section_filter;
} u;
};
struct Stream {
int idx;
int stream_identifier;
};
#define MAX_STREAMS_PER_PROGRAM 128
#define MAX_PIDS_PER_PROGRAM (MAX_STREAMS_PER_PROGRAM + 2)
struct Program {
unsigned int id; // program id/service id
unsigned int pid; // PMT PID (not in upstream)
unsigned int nb_pids;
unsigned int pids[MAX_PIDS_PER_PROGRAM];
unsigned int nb_streams;
struct Stream streams[MAX_STREAMS_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;
int64_t pos47_full;
int pos47; // not in upstream (will be replaced by 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 */
int64_t pcr_incr; /**< used to estimate the exact PCR */
// MythTV only
/** if set, stop_parse is set when PAT/PMT is found */
int scanning;
/** set to PMT_NOT_IN_PAT in pat_cb when scanning is true
* and the MPEG program number "req_sid" is not found in PAT;
* set to PMT_FOUND when a PMT with a the "req_sid" program
* number is found. */
int pmt_scan_state;
// end MythTV only
/* 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 skip_unknown_pmt;
int scan_all_pmts;
int resync_size;
int merge_pmt_versions;
/******************************************/
/* 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;
AVStream *epg_stream;
AVBufferPool* pools[32];
// MythTV only
/** filter for the PAT */
MpegTSFilter *pat_filter;
/** filter for the PMT for the MPEG program number specified by req_sid */
MpegTSFilter *pmt_filter;
/** MPEG program number of stream we want to decode */
int req_sid;
/** number of streams in the last PMT seen */
int pid_cnt;
/** list of streams in the last PMT seen */
int pmt_pids[PMT_PIDS_MAX];
// end MythTV only
};
#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_unknown_pmt", "skip PMTs for programs not advertised in the PAT", offsetof(MpegTSContext, skip_unknown_pmt), AV_OPT_TYPE_BOOL,
{.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{"merge_pmt_versions", "re-use streams when PMT's version/pids change", offsetof(MpegTSContext, merge_pmt_versions), AV_OPT_TYPE_BOOL,
{.i64 = 0}, 0, 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;
int merged_st;
} PESContext;
extern AVInputFormat ff_mythtv_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(struct Program *p)
{
if (!p)
return;
p->nb_pids = 0;
p->nb_streams = 0;
p->pmt_found = 0;
}
static void clear_programs(MpegTSContext *ts)
{
av_freep(&ts->prg);
ts->nb_prg = 0;
}
static struct Program * add_program(MpegTSContext *ts, unsigned int programid)
{
struct Program *p = get_program(ts, programid);
if (p)
return p;
if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
ts->nb_prg = 0;
return NULL;
}
p = &ts->prg[ts->nb_prg];
p->id = programid;
clear_program(p);
ts->nb_prg++;
return p;
}
static void add_pid_to_program(struct Program *p, unsigned int pid)
{
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 update_av_program_info(AVFormatContext *s, unsigned int programid,
unsigned int pid, int version)
{
int i;
for (i = 0; i < s->nb_programs; i++) {
AVProgram *program = s->programs[i];
if (program->id == programid) {
int old_pcr_pid = program->pcr_pid,
old_version = program->pmt_version;
program->pcr_pid = pid;
program->pmt_version = version;
if (old_version != -1 && old_version != version) {
av_log(s, AV_LOG_VERBOSE,
"detected PMT change (program=%d, version=%d/%d, pcr_pid=0x%x/0x%x)\n",
programid, old_version, version, old_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 (pid == PAT_PID)
return 0;
/* 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;
}
//ugly forward declaration
static void mpegts_push_section(MpegTSFilter *filter, const uint8_t *section, int section_len);
/**
* Assemble PES packets out of TS packets, and then call the "section_cb"
* function when they are complete.
*
* NOTE: "DVB Section" is DVB terminology for an MPEG PES packet.
*/
static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
const uint8_t *buf, int buf_size, int is_start)
{
AVFormatContext *s = ts->stream;
MpegTSSectionFilter *tss = &tss1->u.section_filter;
int len;
assert(tss->section_buf);
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;
}
if (tss->section_cb == mpegts_push_section) {
SectionContext *sect = tss->opaque;
sect->new_packet = 1;
}
while (!tss->end_of_section_reached) {
/* 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)
{
if (tss1->pmt_chop_at_ts && tss->section_buf[0] == PMT_TID)
{
/* HACK! To allow BBC IPTV streams with incomplete PMTs (they
* advertise a length of 383, but only send 182 bytes!), we
* will not wait for the remainder of the PMT, but accept just
* what is in the first TS payload, as this is enough to get
* playback, although some PIDs may be filtered out as a result
*/
tss->section_h_size = tss->section_index;
}
else
break;
}
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);
else
av_log(s, AV_LOG_WARNING, "write_section_data: PID %#x CRC error\n", tss1->pid);
if (tss->section_index > tss->section_h_size) {
int left = tss->section_index - tss->section_h_size;
memmove(tss->section_buf, tss->section_buf+tss->section_h_size,
left);
tss->section_index = left;
tss->section_h_size = -1;
} else {
tss->end_of_section_reached = 1;
}
}
}
static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter);
static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
SectionCallback *section_cb, void *opaque,
int check_crc)
{
MpegTSFilter *filter = ts->pids[pid];
MpegTSSectionFilter *sec;
av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
if (filter) {
#ifdef DEBUG
av_log(ts->stream, AV_LOG_DEBUG, "Filter Already Exists\n");
#endif
mpegts_close_filter(ts, filter);
}
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;
filter->pmt_chop_at_ts = 0;
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 (pes->st->priv_data == pes) */
if (!pes->st || pes->merged_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 */
static int get_packet_size(AVFormatContext* s)
{
int score, fec_score, dvhs_score;
int margin;
int ret;
/*init buffer to store stream for probing */
uint8_t buf[PROBE_PACKET_MAX_BUF] = {0};
int buf_size = 0;
int max_iterations = 16;
while (buf_size < PROBE_PACKET_MAX_BUF && max_iterations--) {
ret = avio_read_partial(s->pb, buf + buf_size, PROBE_PACKET_MAX_BUF - buf_size);
if (ret < 0)
return AVERROR_INVALIDDATA;
buf_size += ret;
score = analyze(buf, buf_size, TS_PACKET_SIZE, 0);
dvhs_score = analyze(buf, buf_size, TS_DVHS_PACKET_SIZE, 0);
fec_score = analyze(buf, buf_size, TS_FEC_PACKET_SIZE, 0);
av_log(s, AV_LOG_TRACE, "Probe: %d, score: %d, dvhs_score: %d, fec_score: %d \n",
buf_size, score, dvhs_score, fec_score);
margin = mid_pred(score, fec_score, dvhs_score);
if (buf_size < PROBE_PACKET_MAX_BUF)
margin += PROBE_PACKET_MARGIN; /*if buffer not filled */
if (score > margin)
return TS_PACKET_SIZE;
else if (dvhs_score > margin)
return TS_DVHS_PACKET_SIZE;
else if (fec_score > margin)
return TS_FEC_PACKET_SIZE;
}
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;
#if CONFIG_ICONV
if (len) {
const char *encodings[] = {
"ISO6937", "ISO-8859-5", "ISO-8859-6", "ISO-8859-7",
"ISO-8859-8", "ISO-8859-9", "ISO-8859-10", "ISO-8859-11",
"", "ISO-8859-13", "ISO-8859-14", "ISO-8859-15", "", "", "", "",
"", "UCS-2BE", "KSC_5601", "GB2312", "UCS-2BE", "UTF-8", "", "",
"", "", "", "", "", "", "", ""
};
iconv_t cd;
char *in, *out;
size_t inlen = len, outlen = inlen * 6 + 1;
if (len >= 3 && p[0] == 0x10 && !p[1] && p[2] && p[2] <= 0xf && p[2] != 0xc) {
char iso8859[12];
snprintf(iso8859, sizeof(iso8859), "ISO-8859-%d", p[2]);
inlen -= 3;
in = (char *)p + 3;
cd = iconv_open("UTF-8", iso8859);
} else if (p[0] < 0x20) {
inlen -= 1;
in = (char *)p + 1;
cd = iconv_open("UTF-8", encodings[*p]);
} else {
in = (char *)p;
cd = iconv_open("UTF-8", encodings[0]);
}
if (cd == (iconv_t)-1)
goto no_iconv;
str = out = av_malloc(outlen);
if (!str) {
iconv_close(cd);
return NULL;
}
if (iconv(cd, &in, &inlen, &out, &outlen) == -1) {
iconv_close(cd);
av_freep(&str);
goto no_iconv;
}
iconv_close(cd);
*out = 0;
*pp = p + len;
return str;
}
no_iconv:
#endif
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 },
{ 0x0b, AVMEDIA_TYPE_DATA, AV_CODEC_ID_DSMCC_B }, /* DVB_CAROUSEL_ID */
{ 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 },
{ 0xd2, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_AVS2 },
{ 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 */