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vlc/modules/demux/mpeg/ps.c

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/*****************************************************************************
* ps.c: Program Stream demux module for VLC.
*****************************************************************************
* Copyright (C) 2004-2009 VLC authors and VideoLAN
* $Id$
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_demux.h>
#include "pes.h"
#include "ps.h"
/* TODO:
* - re-add pre-scanning.
* - ...
*/
#define TIME_TEXT N_("Trust MPEG timestamps")
#define TIME_LONGTEXT N_("Normally we use the timestamps of the MPEG files " \
"to calculate position and duration. However sometimes this might not " \
"be usable. Disable this option to calculate from the bitrate instead." )
#define PS_PACKET_PROBE 3
#define CDXA_HEADER_SIZE 44
#define CDXA_SECTOR_SIZE 2352
#define CDXA_SECTOR_HEADER_SIZE 24
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int OpenForce( vlc_object_t * );
static int Open ( vlc_object_t * );
static void Close ( vlc_object_t * );
vlc_module_begin ()
set_description( N_("MPEG-PS demuxer") )
set_shortname( N_("PS") )
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_DEMUX )
set_capability( "demux", 1 )
set_callbacks( OpenForce, Close )
add_shortcut( "ps" )
add_bool( "ps-trust-timestamps", true, TIME_TEXT,
TIME_LONGTEXT, true )
change_safe ()
add_submodule ()
set_description( N_("MPEG-PS demuxer") )
set_capability( "demux", 8 )
set_callbacks( Open, Close )
add_shortcut( "ps" )
vlc_module_end ()
/*****************************************************************************
* Local prototypes
*****************************************************************************/
typedef struct
{
ps_psm_t psm;
ps_track_t tk[PS_TK_COUNT];
int64_t i_pack_scr; /* current read pack scr value, temp */
int64_t i_first_scr; /* media offset */
int64_t i_scr; /* committed, current position */
int64_t i_scr_track_id;
int i_mux_rate;
int64_t i_length;
int i_time_track_index;
int64_t i_current_pts;
uint64_t i_start_byte;
uint64_t i_lastpack_byte;
int i_aob_mlp_count;
bool b_lost_sync;
bool b_have_pack;
bool b_bad_scr;
bool b_seekable;
enum
{
MPEG_PS = 0,
CDXA_PS,
PSMF_PS,
} format;
int current_title;
int current_seekpoint;
unsigned updates;
} demux_sys_t;
static int Demux ( demux_t *p_demux );
static int Control( demux_t *p_demux, int i_query, va_list args );
static int ps_pkt_resynch( stream_t *, int, bool );
static block_t *ps_pkt_read ( stream_t * );
/*****************************************************************************
* Open
*****************************************************************************/
static int OpenCommon( vlc_object_t *p_this, bool b_force )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys;
const uint8_t *p_peek;
ssize_t i_peek = 0;
ssize_t i_offset = 0;
ssize_t i_skip = 0;
unsigned i_max_packets = PS_PACKET_PROBE;
int format = MPEG_PS;
int i_mux_rate = 0;
int i_length = -1;
i_peek = vlc_stream_Peek( p_demux->s, &p_peek, 16 );
if( i_peek < 16 )
{
msg_Dbg( p_demux, "cannot peek" );
return VLC_EGENERIC;
}
if( !memcmp( p_peek, "PSMF", 4 ) &&
(GetDWBE( &p_peek[4] ) & 0x30303030) == 0x30303030 )
{
i_peek = vlc_stream_Peek( p_demux->s, &p_peek, 100 );
if( i_peek < 100 )
return VLC_EGENERIC;
i_skip = i_offset = GetWBE( &p_peek[10] );
format = PSMF_PS;
msg_Info( p_demux, "Detected PSMF-PS header");
i_mux_rate = GetDWBE( &p_peek[96] );
if( GetDWBE( &p_peek[86] ) > 0 )
i_length = CLOCK_FREQ * GetDWBE( &p_peek[92] ) / GetDWBE( &p_peek[86] );
}
else if( !memcmp( p_peek, "RIFF", 4 ) && !memcmp( &p_peek[8], "CDXA", 4 ) )
{
format = CDXA_PS;
i_max_packets = 0; /* We can't probe here */
i_skip = CDXA_HEADER_SIZE;
msg_Info( p_demux, "Detected CDXA-PS" );
/* FIXME: have a proper way to decap CD sectors or make an access stream filter */
}
else if( b_force )
{
msg_Warn( p_demux, "this does not look like an MPEG PS stream, "
"continuing anyway" );
i_max_packets = 0;
}
for( unsigned i=0; i<i_max_packets; i++ )
{
if( i_peek < i_offset + 16 )
{
i_peek = vlc_stream_Peek( p_demux->s, &p_peek, i_offset + 16 );
if( i_peek < i_offset + 16 )
return VLC_EGENERIC;
}
const uint8_t startcode[3] = { 0x00, 0x00, 0x01 };
const uint8_t *p_header = &p_peek[i_offset];
if( memcmp( p_header, startcode, 3 ) ||
( (p_header[3] & 0xB0) != 0xB0 &&
!(p_header[3] >= 0xC0 && p_header[3] <= 0xEF) &&
p_header[3] != PS_STREAM_ID_EXTENDED &&
p_header[3] != PS_STREAM_ID_DIRECTORY ) )
return VLC_EGENERIC;
ssize_t i_pessize = ps_pkt_size( p_header, 16 );
if( i_pessize < 5 )
return VLC_EGENERIC;
i_offset += i_pessize;
}
if( i_skip > 0 && !p_demux->b_preparsing &&
vlc_stream_Read( p_demux->s, NULL, i_skip ) != i_skip )
return VLC_EGENERIC;
/* Fill p_demux field */
p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
if( !p_sys ) return VLC_ENOMEM;
p_demux->pf_demux = Demux;
p_demux->pf_control = Control;
/* Init p_sys */
p_sys->i_mux_rate = i_mux_rate;
p_sys->i_pack_scr = -1;
p_sys->i_first_scr = -1;
p_sys->i_scr = -1;
p_sys->i_scr_track_id = 0;
p_sys->i_length = i_length;
p_sys->i_current_pts = (vlc_tick_t) 0;
p_sys->i_time_track_index = -1;
p_sys->i_aob_mlp_count = 0;
p_sys->i_start_byte = i_skip;
p_sys->i_lastpack_byte = i_skip;
p_sys->b_lost_sync = false;
p_sys->b_have_pack = false;
p_sys->b_bad_scr = false;
p_sys->b_seekable = false;
p_sys->format = format;
p_sys->current_title = 0;
p_sys->current_seekpoint = 0;
p_sys->updates = 0;
vlc_stream_Control( p_demux->s, STREAM_CAN_SEEK, &p_sys->b_seekable );
ps_psm_init( &p_sys->psm );
ps_track_init( p_sys->tk );
/* TODO prescanning of ES */
return VLC_SUCCESS;
}
static int OpenForce( vlc_object_t *p_this )
{
return OpenCommon( p_this, true );
}
static int Open( vlc_object_t *p_this )
{
return OpenCommon( p_this, p_this->obj.force );
}
/*****************************************************************************
* Close
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys = p_demux->p_sys;
int i;
for( i = 0; i < PS_TK_COUNT; i++ )
{
ps_track_t *tk = &p_sys->tk[i];
if( tk->b_configured )
{
es_format_Clean( &tk->fmt );
if( tk->es ) es_out_Del( p_demux->out, tk->es );
}
}
ps_psm_destroy( &p_sys->psm );
free( p_sys );
}
static int Probe( demux_t *p_demux, bool b_end )
{
demux_sys_t *p_sys = p_demux->p_sys;
int i_ret, i_id;
block_t *p_pkt;
i_ret = ps_pkt_resynch( p_demux->s, p_sys->format, p_sys->b_have_pack );
if( i_ret < 0 )
{
return VLC_DEMUXER_EOF;
}
else if( i_ret == 0 )
{
if( !p_sys->b_lost_sync )
msg_Warn( p_demux, "garbage at input, trying to resync..." );
p_sys->b_lost_sync = true;
return VLC_DEMUXER_SUCCESS;
}
if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
p_sys->b_lost_sync = false;
if( ( p_pkt = ps_pkt_read( p_demux->s ) ) == NULL )
{
return VLC_DEMUXER_EOF;
}
i_id = ps_pkt_id( p_pkt );
if( i_id >= 0xc0 )
{
ps_track_t *tk = &p_sys->tk[ps_id_to_tk(i_id)];
if( !ps_pkt_parse_pes( VLC_OBJECT(p_demux), p_pkt, tk->i_skip ) &&
p_pkt->i_pts != VLC_TICK_INVALID )
{
if( b_end && p_pkt->i_pts > tk->i_last_pts )
{
tk->i_last_pts = p_pkt->i_pts;
}
else if ( tk->i_first_pts == -1 )
{
tk->i_first_pts = p_pkt->i_pts;
}
}
}
else if( i_id == PS_STREAM_ID_PACK_HEADER )
{
int64_t i_scr; int dummy;
if( !b_end && !ps_pkt_parse_pack( p_pkt, &i_scr, &dummy ) )
{
if( p_sys->i_first_scr == -1 )
p_sys->i_first_scr = i_scr;
}
p_sys->b_have_pack = true;
}
block_Release( p_pkt );
return VLC_DEMUXER_SUCCESS;
}
static bool FindLength( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
int64_t i_current_pos = -1, i_size = 0, i_end = 0;
if( !var_CreateGetBool( p_demux, "ps-trust-timestamps" ) )
return true;
if( p_sys->i_length == -1 ) /* First time */
{
p_sys->i_length = 0;
/* Check beginning */
int i = 0;
i_current_pos = vlc_stream_Tell( p_demux->s );
while( i < 40 && Probe( p_demux, false ) > 0 ) i++;
/* Check end */
i_size = stream_Size( p_demux->s );
i_end = VLC_CLIP( i_size, 0, 200000 );
if( vlc_stream_Seek( p_demux->s, i_size - i_end ) == VLC_SUCCESS )
{
i = 0;
while( i < 400 && Probe( p_demux, true ) > 0 ) i++;
if( i_current_pos >= 0 &&
vlc_stream_Seek( p_demux->s, i_current_pos ) != VLC_SUCCESS )
return false;
}
else return false;
}
/* Find the longest track */
for( int i = 0; i < PS_TK_COUNT; i++ )
{
ps_track_t *tk = &p_sys->tk[i];
if( tk->i_first_pts >= 0 &&
tk->i_last_pts > tk->i_first_pts )
{
int64_t i_length = (int64_t)tk->i_last_pts - tk->i_first_pts;
if( i_length > p_sys->i_length )
{
p_sys->i_length = i_length;
p_sys->i_time_track_index = i;
msg_Dbg( p_demux, "we found a length of: %"PRId64 "s", p_sys->i_length / CLOCK_FREQ );
}
}
}
return true;
}
static void NotifyDiscontinuity( ps_track_t *p_tk, es_out_t *out )
{
bool b_selected;
for( size_t i = 0; i < PS_TK_COUNT; i++ )
{
ps_track_t *tk = &p_tk[i];
if( tk->es &&
es_out_Control( out, ES_OUT_GET_ES_STATE, tk->es, &b_selected ) == VLC_SUCCESS
&& b_selected )
{
tk->i_next_block_flags |= BLOCK_FLAG_DISCONTINUITY;
}
}
}
static void CheckPCR( demux_sys_t *p_sys, es_out_t *out, vlc_tick_t i_scr )
{
if( p_sys->i_scr != VLC_TICK_INVALID &&
llabs( p_sys->i_scr - i_scr ) > CLOCK_FREQ )
NotifyDiscontinuity( p_sys->tk, out );
}
/*****************************************************************************
* Demux:
*****************************************************************************/
static int Demux( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
int i_ret, i_mux_rate;
block_t *p_pkt;
i_ret = ps_pkt_resynch( p_demux->s, p_sys->format, p_sys->b_have_pack );
if( i_ret < 0 )
{
return VLC_DEMUXER_EOF;
}
else if( i_ret == 0 )
{
if( !p_sys->b_lost_sync )
{
msg_Warn( p_demux, "garbage at input from %"PRIu64", trying to resync...",
vlc_stream_Tell(p_demux->s) );
NotifyDiscontinuity( p_sys->tk, p_demux->out );
}
p_sys->b_lost_sync = true;
return VLC_DEMUXER_SUCCESS;
}
if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
p_sys->b_lost_sync = false;
if( p_sys->i_length < 0 && p_sys->b_seekable )
{
if( !FindLength( p_demux ) )
return VLC_DEMUXER_EGENERIC;
}
if( ( p_pkt = ps_pkt_read( p_demux->s ) ) == NULL )
{
return VLC_DEMUXER_EOF;
}
if( p_pkt->i_buffer < 4 )
{
block_Release( p_pkt );
return VLC_DEMUXER_EGENERIC;
}
const uint8_t i_stream_id = p_pkt->p_buffer[3];
switch( i_stream_id )
{
case PS_STREAM_ID_END_STREAM:
block_Release( p_pkt );
break;
case PS_STREAM_ID_PACK_HEADER:
if( !ps_pkt_parse_pack( p_pkt, &p_sys->i_pack_scr, &i_mux_rate ) )
{
if( p_sys->i_first_scr == -1 )
p_sys->i_first_scr = p_sys->i_pack_scr;
CheckPCR( p_sys, p_demux->out, p_sys->i_pack_scr );
p_sys->i_scr = p_sys->i_pack_scr;
p_sys->i_lastpack_byte = vlc_stream_Tell( p_demux->s );
if( !p_sys->b_have_pack ) p_sys->b_have_pack = true;
/* done later on to work around bad vcd/svcd streams */
/* es_out_SetPCR( p_demux->out, p_sys->i_scr ); */
if( i_mux_rate > 0 ) p_sys->i_mux_rate = i_mux_rate;
}
block_Release( p_pkt );
break;
case PS_STREAM_ID_SYSTEM_HEADER:
if( !ps_pkt_parse_system( p_pkt, &p_sys->psm, p_sys->tk ) )
{
int i;
for( i = 0; i < PS_TK_COUNT; i++ )
{
ps_track_t *tk = &p_sys->tk[i];
if( !tk->b_configured && tk->fmt.i_cat != UNKNOWN_ES )
{
if( tk->b_seen )
tk->es = es_out_Add( p_demux->out, &tk->fmt );
/* else create when seeing packet */
tk->b_configured = true;
}
}
}
block_Release( p_pkt );
break;
case PS_STREAM_ID_MAP:
if( p_sys->psm.i_version == 0xFFFF )
msg_Dbg( p_demux, "contains a PSM");
ps_psm_fill( &p_sys->psm, p_pkt, p_sys->tk, p_demux->out );
block_Release( p_pkt );
break;
default:
/* Reject non video/audio nor PES */
if( i_stream_id < 0xC0 || i_stream_id > 0xEF )
{
block_Release( p_pkt );
break;
}
/* fallthrough */
case PS_STREAM_ID_PRIVATE_STREAM1:
case PS_STREAM_ID_EXTENDED:
{
int i_id = ps_pkt_id( p_pkt );
/* Small heuristic to improve MLP detection from AOB */
if( i_id == 0xa001 &&
p_sys->i_aob_mlp_count < 500 )
{
p_sys->i_aob_mlp_count++;
}
else if( i_id == 0xbda1 &&
p_sys->i_aob_mlp_count > 0 )
{
p_sys->i_aob_mlp_count--;
i_id = 0xa001;
}
bool b_new = false;
ps_track_t *tk = &p_sys->tk[ps_id_to_tk(i_id)];
if( !tk->b_configured )
{
if( !ps_track_fill( tk, &p_sys->psm, i_id, p_pkt, false ) )
{
/* No PSM and no probing yet */
if( p_sys->format == PSMF_PS )
{
if( tk->fmt.i_cat == VIDEO_ES )
tk->fmt.i_codec = VLC_CODEC_H264;
#if 0
if( i_stream_id == PS_STREAM_ID_PRIVATE_STREAM1 )
{
es_format_Change( &tk->fmt, AUDIO_ES, VLC_CODEC_ATRAC3P );
tk->fmt.audio.i_blockalign = 376;
tk->fmt.audio.i_channels = 2;
tk->fmt.audio.i_rate = 44100;
}
#endif
}
tk->es = es_out_Add( p_demux->out, &tk->fmt );
b_new = true;
tk->b_configured = true;
}
else
{
msg_Dbg( p_demux, "es id=0x%x format unknown", i_id );
}
}
/* Late creation from system header */
if( !tk->b_seen && tk->b_configured && !tk->es && tk->fmt.i_cat != UNKNOWN_ES )
tk->es = es_out_Add( p_demux->out, &tk->fmt );
tk->b_seen = true;
/* The popular VCD/SVCD subtitling WinSubMux does not
* renumber the SCRs when merging subtitles into the PES */
if( tk->b_seen && !p_sys->b_bad_scr &&
( tk->fmt.i_codec == VLC_CODEC_OGT ||
tk->fmt.i_codec == VLC_CODEC_CVD ) )
{
p_sys->b_bad_scr = true;
p_sys->i_first_scr = -1;
}
if( p_sys->i_pack_scr >= 0 && !p_sys->b_bad_scr )
{
if( (tk->fmt.i_cat == AUDIO_ES || tk->fmt.i_cat == VIDEO_ES) &&
tk->i_first_pts != VLC_TICK_INVALID && tk->i_first_pts - p_sys->i_pack_scr > 2 * CLOCK_FREQ )
{
msg_Warn( p_demux, "Incorrect SCR timing offset by of %"PRId64 "ms, disabling",
tk->i_first_pts - p_sys->i_pack_scr / 1000 );
p_sys->b_bad_scr = true; /* Disable Offset SCR */
p_sys->i_first_scr = -1;
}
else
es_out_SetPCR( p_demux->out, VLC_TICK_0 + p_sys->i_pack_scr );
}
if( tk->b_configured && tk->es &&
!ps_pkt_parse_pes( VLC_OBJECT(p_demux), p_pkt, tk->i_skip ) )
{
if( tk->fmt.i_cat == AUDIO_ES || tk->fmt.i_cat == VIDEO_ES )
{
if( !p_sys->b_bad_scr && p_sys->i_pack_scr > 0 && p_pkt->i_pts > 0 &&
p_sys->i_pack_scr > p_pkt->i_pts + VLC_TICK_FROM_MS(250) )
{
msg_Warn( p_demux, "Incorrect SCR timing in advance of %" PRId64 "ms, disabling",
p_sys->i_pack_scr - p_pkt->i_pts / 1000 );
p_sys->b_bad_scr = true;
p_sys->i_first_scr = -1;
}
if( (p_sys->b_bad_scr || !p_sys->b_have_pack) && !p_sys->i_scr_track_id )
{
p_sys->i_scr_track_id = tk->i_id;
}
}
if( ((!b_new && !p_sys->b_have_pack) || p_sys->b_bad_scr) &&
p_sys->i_scr_track_id == tk->i_id &&
p_pkt->i_pts != VLC_TICK_INVALID )
{
/* A hack to sync the A/V on PES files. */
msg_Dbg( p_demux, "force SCR: %"PRId64, p_pkt->i_pts );
CheckPCR( p_sys, p_demux->out, p_pkt->i_pts );
p_sys->i_scr = p_pkt->i_pts;
if( p_sys->i_first_scr == -1 )
p_sys->i_first_scr = p_sys->i_scr;
es_out_SetPCR( p_demux->out, p_pkt->i_pts );
}
if( tk->fmt.i_codec == VLC_CODEC_TELETEXT &&
p_pkt->i_pts == VLC_TICK_INVALID && p_sys->i_scr >= 0 )
{
/* Teletext may have missing PTS (ETSI EN 300 472 Annexe A)
* In this case use the last SCR + 40ms */
p_pkt->i_pts = VLC_TICK_0 + p_sys->i_scr + 40000;
}
if( (int64_t)p_pkt->i_pts > p_sys->i_current_pts )
{
p_sys->i_current_pts = (int64_t)p_pkt->i_pts;
}
if( tk->i_next_block_flags )
{
p_pkt->i_flags = tk->i_next_block_flags;
tk->i_next_block_flags = 0;
}
#if 0
if( tk->fmt.i_codec == VLC_CODEC_ATRAC3P )
{
p_pkt->p_buffer += 14;
p_pkt->i_buffer -= 14;
}
#endif
es_out_Send( p_demux->out, tk->es, p_pkt );
}
else
{
block_Release( p_pkt );
}
p_sys->i_pack_scr = -1;
}
break;
}
demux_UpdateTitleFromStream( p_demux );
return VLC_DEMUXER_SUCCESS;
}
/*****************************************************************************
* Control:
*****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
demux_sys_t *p_sys = p_demux->p_sys;
double f, *pf;
int64_t i64, *pi64;
int i_ret;
switch( i_query )
{
case DEMUX_CAN_SEEK:
*va_arg( args, bool * ) = p_sys->b_seekable;
return VLC_SUCCESS;
case DEMUX_GET_TITLE:
*va_arg( args, int * ) = p_sys->current_title;
return VLC_SUCCESS;
case DEMUX_GET_SEEKPOINT:
*va_arg( args, int * ) = p_sys->current_seekpoint;
return VLC_SUCCESS;
case DEMUX_GET_POSITION:
pf = va_arg( args, double * );
i64 = stream_Size( p_demux->s ) - p_sys->i_start_byte;
if( i64 > 0 )
{
double current = vlc_stream_Tell( p_demux->s ) - p_sys->i_start_byte;
*pf = current / (double)i64;
}
else
{
*pf = 0.0;
}
return VLC_SUCCESS;
case DEMUX_SET_POSITION:
f = va_arg( args, double );
i64 = stream_Size( p_demux->s ) - p_sys->i_start_byte;
p_sys->i_current_pts = 0;
p_sys->i_scr = -1;
if( p_sys->format == CDXA_PS )
{
i64 = (int64_t)(i64 * f); /* Align to sector payload */
i64 = p_sys->i_start_byte + i64 - (i64 % CDXA_SECTOR_SIZE) + CDXA_SECTOR_HEADER_SIZE;
}
else
{
i64 = p_sys->i_start_byte + (int64_t)(i64 * f);
}
i_ret = vlc_stream_Seek( p_demux->s, i64 );
if( i_ret == VLC_SUCCESS )
{
NotifyDiscontinuity( p_sys->tk, p_demux->out );
return i_ret;
}
break;
case DEMUX_GET_TIME:
pi64 = va_arg( args, int64_t * );
if( p_sys->i_time_track_index >= 0 && p_sys->i_current_pts > 0 )
{
*pi64 = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track_index].i_first_pts;
return VLC_SUCCESS;
}
if( p_sys->i_first_scr > -1 && p_sys->i_scr > -1 )
{
*pi64 = p_sys->i_scr - p_sys->i_first_scr;
/* H.222 2.5.2.2 */
if( p_sys->i_mux_rate > 0 && p_sys->b_have_pack )
{
uint64_t i_offset = vlc_stream_Tell( p_demux->s ) - p_sys->i_lastpack_byte;
*pi64 += CLOCK_FREQ * i_offset / (p_sys->i_mux_rate * 50);
}
return VLC_SUCCESS;
}
*pi64 = 0;
break;
case DEMUX_GET_LENGTH:
pi64 = va_arg( args, int64_t * );
if( p_sys->i_length > 0 )
{
*pi64 = p_sys->i_length;
return VLC_SUCCESS;
}
else if( p_sys->i_mux_rate > 0 )
{
*pi64 = CLOCK_FREQ * ( stream_Size( p_demux->s ) - p_sys->i_start_byte / 50 ) /
p_sys->i_mux_rate;
return VLC_SUCCESS;
}
*pi64 = 0;
break;
case DEMUX_SET_TIME:
i64 = va_arg( args, int64_t );
if( p_sys->i_time_track_index >= 0 && p_sys->i_current_pts > 0 && p_sys->i_length )
{
i64 -= p_sys->tk[p_sys->i_time_track_index].i_first_pts;
return demux_Control( p_demux, DEMUX_SET_POSITION, (double) i64 / p_sys->i_length );
}
break;
case DEMUX_GET_TITLE_INFO:
{
struct input_title_t ***v = va_arg( args, struct input_title_t*** );
int *c = va_arg( args, int * );
*va_arg( args, int* ) = 0; /* Title offset */
*va_arg( args, int* ) = 0; /* Chapter offset */
return vlc_stream_Control( p_demux->s, STREAM_GET_TITLE_INFO, v,
c );
}
case DEMUX_SET_TITLE:
return vlc_stream_vaControl( p_demux->s, STREAM_SET_TITLE, args );
case DEMUX_SET_SEEKPOINT:
return vlc_stream_vaControl( p_demux->s, STREAM_SET_SEEKPOINT,
args );
case DEMUX_TEST_AND_CLEAR_FLAGS:
{
unsigned *restrict flags = va_arg(args, unsigned *);
*flags &= p_sys->updates;
p_sys->updates &= ~*flags;
return VLC_SUCCESS;
}
case DEMUX_GET_META:
return vlc_stream_vaControl( p_demux->s, STREAM_GET_META, args );
case DEMUX_GET_FPS:
break;
case DEMUX_CAN_PAUSE:
case DEMUX_SET_PAUSE_STATE:
case DEMUX_CAN_CONTROL_PACE:
case DEMUX_GET_PTS_DELAY:
return demux_vaControlHelper( p_demux->s, 0, -1, 0, 1, i_query, args );
default:
break;
}
return VLC_EGENERIC;
}
/*****************************************************************************
* Divers:
*****************************************************************************/
/* PSResynch: resynch on a system startcode
* It doesn't skip more than 512 bytes
* -1 -> error, 0 -> not synch, 1 -> ok
*/
static int ps_pkt_resynch( stream_t *s, int format, bool b_pack )
{
const uint8_t *p_peek;
int i_peek;
int i_skip;
if( vlc_stream_Peek( s, &p_peek, 4 ) < 4 )
{
return -1;
}
if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
p_peek[3] >= PS_STREAM_ID_END_STREAM )
{
return 1;
}
if( ( i_peek = vlc_stream_Peek( s, &p_peek, 512 ) ) < 4 )
{
return -1;
}
i_skip = 0;
for( ;; )
{
if( i_peek < 4 )
{
break;
}
/* Handle mid stream 24 bytes padding+CRC creating emulated sync codes with incorrect
PES sizes and frelling up to UINT16_MAX bytes followed by 24 bytes CDXA Header */
if( format == CDXA_PS && i_skip == 0 && i_peek >= 48 )
{
const uint8_t cdxasynccode[12] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
if( !memcmp( &p_peek[24], cdxasynccode, 12 ) )
{
i_peek -= 48;
p_peek += 48;
i_skip += 48;
continue;
}
}
if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
p_peek[3] >= PS_STREAM_ID_END_STREAM &&
( !b_pack || p_peek[3] == PS_STREAM_ID_PACK_HEADER ) )
{
return vlc_stream_Read( s, NULL, i_skip ) == i_skip ? 1 : -1;
}
p_peek++;
i_peek--;
i_skip++;
}
return vlc_stream_Read( s, NULL, i_skip ) == i_skip ? 0 : -1;
}
static block_t *ps_pkt_read( stream_t *s )
{
const uint8_t *p_peek;
int i_peek = vlc_stream_Peek( s, &p_peek, 14 );
if( i_peek < 4 )
return NULL;
int i_size = ps_pkt_size( p_peek, i_peek );
if( i_size <= 6 && p_peek[3] > PS_STREAM_ID_PACK_HEADER )
{
/* Special case, search the next start code */
i_size = 6;
for( ;; )
{
i_peek = vlc_stream_Peek( s, &p_peek, i_size + 1024 );
if( i_peek <= i_size + 4 )
{
return NULL;
}
while( i_size <= i_peek - 4 )
{
if( p_peek[i_size] == 0x00 && p_peek[i_size+1] == 0x00 &&
p_peek[i_size+2] == 0x01 && p_peek[i_size+3] >= PS_STREAM_ID_END_STREAM )
{
return vlc_stream_Block( s, i_size );
}
i_size++;
}
}
}
else
{
/* Normal case */
return vlc_stream_Block( s, i_size );
}
return NULL;
}