mirror of https://code.videolan.org/videolan/vlc
103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/*****************************************************************************
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* float32.c : precise float32 audio volume implementation
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*****************************************************************************
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* Copyright (C) 2002 VLC authors and VideoLAN
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stddef.h>
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_aout.h>
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#include <vlc_aout_volume.h>
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Create( vlc_object_t * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin ()
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set_category( CAT_AUDIO )
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set_subcategory( SUBCAT_AUDIO_MISC )
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set_description( N_("Single precision audio volume") )
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set_capability( "audio volume", 10 )
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set_callback( Create )
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vlc_module_end ()
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/**
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* Mixes a new output buffer
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*/
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static void FilterFL32( audio_volume_t *p_volume, block_t *p_buffer,
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float f_multiplier )
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{
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if( f_multiplier == 1.f )
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return; /* nothing to do */
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float *p = (float *)p_buffer->p_buffer;
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for( size_t i = p_buffer->i_buffer / sizeof(*p); i > 0; i-- )
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*(p++) *= f_multiplier;
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(void) p_volume;
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}
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static void FilterFL64( audio_volume_t *p_volume, block_t *p_buffer,
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float f_multiplier )
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{
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double *p = (double *)p_buffer->p_buffer;
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double mult = f_multiplier;
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if( mult == 1. )
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return; /* nothing to do */
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for( size_t i = p_buffer->i_buffer / sizeof(*p); i > 0; i-- )
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*(p++) *= mult;
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(void) p_volume;
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}
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/**
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* Initializes the mixer
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*/
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static int Create( vlc_object_t *p_this )
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{
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audio_volume_t *p_volume = (audio_volume_t *)p_this;
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switch (p_volume->format)
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{
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case VLC_CODEC_FL32:
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p_volume->amplify = FilterFL32;
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break;
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case VLC_CODEC_FL64:
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p_volume->amplify = FilterFL64;
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break;
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default:
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return -1;
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}
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return 0;
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}
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