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vlc/modules/demux/tta.c
Laurent Aimar 0e0065f229 Fixed initial timestamp value in TTA demuxer.
2009-12-20 23:23:29 +01:00

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8.5 KiB
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/*****************************************************************************
* tta.c : The Lossless True Audio parser
*****************************************************************************
* Copyright (C) 2006 the VideoLAN team
* $Id$
*
* Authors: Derk-Jan Hartman <hartman at videolan dot org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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 <vlc_codec.h>
#include <math.h>
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close ( vlc_object_t * );
vlc_module_begin ()
set_shortname( "TTA" )
set_description( N_("TTA demuxer") )
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_DEMUX )
set_capability( "demux", 145 )
set_callbacks( Open, Close )
add_shortcut( "tta" )
vlc_module_end ()
#define TTA_FRAMETIME 1.04489795918367346939
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Demux ( demux_t * );
static int Control( demux_t *, int, va_list );
struct demux_sys_t
{
/* */
es_out_id_t *p_es;
/* */
uint32_t i_totalframes;
uint32_t i_currentframe;
uint32_t *pi_seektable;
uint32_t i_datalength;
int i_framelength;
/* */
vlc_meta_t *p_meta;
int64_t i_start;
};
/*****************************************************************************
* Open: initializes ES structures
*****************************************************************************/
static int Open( vlc_object_t * p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys;
es_format_t fmt;
const uint8_t *p_peek;
uint8_t p_header[22];
uint8_t *p_fullheader;
int i_seektable_size = 0;
//char psz_info[4096];
//module_t *p_id3;
if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
return VLC_EGENERIC;
if( memcmp( p_peek, "TTA1", 4 ) )
{
if( !p_demux->b_force )
return VLC_EGENERIC;
/* User forced */
msg_Err( p_demux, "this doesn't look like a true-audio stream, "
"continuing anyway" );
}
if( stream_Read( p_demux->s, p_header, 22 ) < 22 )
return VLC_EGENERIC;
/* Fill p_demux fields */
p_demux->pf_demux = Demux;
p_demux->pf_control = Control;
p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
if( !p_sys )
return VLC_ENOMEM;
p_sys->pi_seektable = NULL;
/* Read the metadata */
es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_TTA );
fmt.audio.i_channels = GetWLE( &p_header[6] );
fmt.audio.i_bitspersample = GetWLE( &p_header[8] );
fmt.audio.i_rate = GetDWLE( &p_header[10] );
if( fmt.audio.i_rate == 0 || /* Avoid divide by 0 */
fmt.audio.i_rate > ( 1 << 20 ) /* Avoid i_framelength overflow */ )
{
msg_Warn( p_demux, "Wrong sample rate" );
goto error;
}
p_sys->i_datalength = GetDWLE( &p_header[14] );
p_sys->i_framelength = TTA_FRAMETIME * fmt.audio.i_rate;
p_sys->i_totalframes = p_sys->i_datalength / p_sys->i_framelength +
((p_sys->i_datalength % p_sys->i_framelength) != 0);
p_sys->i_currentframe = 0;
if( p_sys->i_totalframes > (1 << 29))
goto error;
i_seektable_size = sizeof(uint32_t)*p_sys->i_totalframes;
/* Store the header and Seektable for avcodec */
fmt.i_extra = 22 + i_seektable_size + 4;
fmt.p_extra = p_fullheader = malloc( fmt.i_extra );
if( !p_fullheader )
goto error;
memcpy( p_fullheader, p_header, 22 );
p_fullheader += 22;
if( stream_Read( p_demux->s, p_fullheader, i_seektable_size )
!= i_seektable_size )
goto error;
p_sys->pi_seektable = calloc( p_sys->i_totalframes, sizeof(uint32_t) );
if( !p_sys->pi_seektable )
goto error;
for( uint32_t i = 0; i < p_sys->i_totalframes; i++ )
{
p_sys->pi_seektable[i] = GetDWLE( p_fullheader );
p_fullheader += 4;
}
stream_Read( p_demux->s, p_fullheader, 4 ); /* CRC */
p_fullheader += 4;
p_sys->p_es = es_out_Add( p_demux->out, &fmt );
p_sys->i_start = p_fullheader - (uint8_t *)fmt.p_extra;
return VLC_SUCCESS;
error:
es_format_Clean( &fmt );
Close( p_this );
return VLC_EGENERIC;
}
/*****************************************************************************
* Close: frees unused data
*****************************************************************************/
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;
free( p_sys->pi_seektable );
free( p_sys );
}
/*****************************************************************************
* Demux:
*****************************************************************************
* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
*****************************************************************************/
static int Demux( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
block_t *p_data;
if( p_sys->i_currentframe > p_sys->i_totalframes )
return 0;
p_data = stream_Block( p_demux->s, p_sys->pi_seektable[p_sys->i_currentframe] );
if( p_data == NULL ) return 0;
p_data->i_dts = p_data->i_pts = VLC_TS_0 + (int64_t)(INT64_C(1000000) * p_sys->i_currentframe) * TTA_FRAMETIME;
p_sys->i_currentframe++;
es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_data->i_dts );
es_out_Send( p_demux->out, p_sys->p_es, p_data );
return 1;
}
/*****************************************************************************
* 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;
switch( i_query )
{
case DEMUX_GET_POSITION:
pf = (double*) va_arg( args, double* );
i64 = stream_Size( p_demux->s ) - p_sys->i_start;
if( i64 > 0 )
{
*pf = (double)(stream_Tell( p_demux->s ) - p_sys->i_start )/ (double)i64;
}
else
{
*pf = 0.0;
}
return VLC_SUCCESS;
case DEMUX_SET_POSITION:
f = (double)va_arg( args, double );
i64 = (int64_t)(f * (stream_Size( p_demux->s ) - p_sys->i_start));
if( i64 > 0 )
{
int64_t tmp = 0;
uint32_t i;
for( i=0; i < p_sys->i_totalframes && tmp+p_sys->pi_seektable[i] < i64; i++)
{
tmp += p_sys->pi_seektable[i];
}
stream_Seek( p_demux->s, tmp+p_sys->i_start );
p_sys->i_currentframe = i;
return VLC_SUCCESS;
}
return VLC_EGENERIC;
case DEMUX_GET_LENGTH:
pi64 = (int64_t*)va_arg( args, int64_t * );
*pi64 = INT64_C(1000000) * p_sys->i_totalframes * TTA_FRAMETIME;
return VLC_SUCCESS;
case DEMUX_GET_TIME:
pi64 = (int64_t*)va_arg( args, int64_t * );
*pi64 = INT64_C(1000000) * p_sys->i_currentframe * TTA_FRAMETIME;
return VLC_SUCCESS;
default:
return VLC_EGENERIC;
}
}
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