1 /*****************************************************************************
2 * float32.c : precise float32 audio volume implementation
3 *****************************************************************************
4 * Copyright (C) 2002 the VideoLAN team
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
36 #include <vlc_aout_volume.h>
38 /*****************************************************************************
40 *****************************************************************************/
41 static int Create( vlc_object_t * );
42 static void DoWork( audio_volume_t *, block_t *, float );
44 /*****************************************************************************
46 *****************************************************************************/
48 set_category( CAT_AUDIO )
49 set_subcategory( SUBCAT_AUDIO_MISC )
50 set_description( N_("Single precision audio volume") )
51 set_capability( "audio volume", 10 )
52 set_callbacks( Create, NULL )
56 * Initializes the mixer
58 static int Create( vlc_object_t *p_this )
60 audio_volume_t *p_volume = (audio_volume_t *)p_this;
62 if (p_volume->format != VLC_CODEC_FL32)
65 p_volume->amplify = DoWork;
70 * Mixes a new output buffer
72 static void DoWork( audio_volume_t *p_volume, block_t *p_buffer,
75 if( f_multiplier == 1.0 )
76 return; /* nothing to do */
78 float *p = (float *)p_buffer->p_buffer;
79 for( size_t i = p_buffer->i_buffer / sizeof(float); i > 0; i-- )
80 *(p++) *= f_multiplier;