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/*****************************************************************************
* float32.c : precise float32 audio volume implementation
*****************************************************************************
* Copyright (C) 2002 VLC authors and VideoLAN
* $Id$
*
* Authors: Christophe Massiot <massiot@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 <stddef.h>
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_aout.h>
#include <vlc_aout_volume.h>
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create( vlc_object_t * );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin ()
set_category( CAT_AUDIO )
set_subcategory( SUBCAT_AUDIO_MISC )
set_description( N_("Single precision audio volume") )
set_capability( "audio volume", 10 )
set_callbacks( Create, NULL )
vlc_module_end ()
/**
* Mixes a new output buffer
*/
static void FilterFL32( audio_volume_t *p_volume, block_t *p_buffer,
float f_multiplier )
{
if( f_multiplier == 1.f )
return; /* nothing to do */
float *p = (float *)p_buffer->p_buffer;
for( size_t i = p_buffer->i_buffer / sizeof(*p); i > 0; i-- )
*(p++) *= f_multiplier;
(void) p_volume;
}
static void FilterFL64( audio_volume_t *p_volume, block_t *p_buffer,
float f_multiplier )
{
double *p = (double *)p_buffer->p_buffer;
double mult = f_multiplier;
if( mult == 1. )
return; /* nothing to do */
for( size_t i = p_buffer->i_buffer / sizeof(*p); i > 0; i-- )
*(p++) *= mult;
(void) p_volume;
}
/**
* Initializes the mixer
*/
static int Create( vlc_object_t *p_this )
{
audio_volume_t *p_volume = (audio_volume_t *)p_this;
switch (p_volume->format)
{
case VLC_CODEC_FL32:
p_volume->amplify = FilterFL32;
break;
case VLC_CODEC_FL64:
p_volume->amplify = FilterFL64;
break;
default:
return -1;
}
return 0;
}
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