1 /*****************************************************************************
2 * float.c: Floating point audio format conversions
3 *****************************************************************************
4 * Copyright (C) 2002, 2006-2009 the VideoLAN team
7 * Authors: Jean-Paul Saman <jpsaman _at_ videolan _dot_ org>
8 * Christophe Massiot <massiot@via.ecp.fr>
9 * Samuel Hocevar <sam@zoy.org>
10 * Xavier Maillard <zedek@fxgsproject.org>
11 * Henri Fallon <henri@videolan.org>
12 * Gildas Bazin <gbazin@netcourrier.com>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
27 *****************************************************************************/
29 /*****************************************************************************
31 *****************************************************************************/
36 #include <vlc_common.h>
37 #include <vlc_plugin.h>
39 #include <vlc_filter.h>
41 /*****************************************************************************
43 *****************************************************************************/
44 static int Create_F32ToFL32 ( vlc_object_t * );
45 static block_t *Do_F32ToFL32( filter_t *, block_t * );
46 static block_t *Do_FL32ToF32 ( filter_t *, block_t * );
48 /*****************************************************************************
50 *****************************************************************************/
52 set_description( N_("Floating-point audio format conversions") )
54 set_capability( "audio filter2", 10 )
55 set_callbacks( Create_F32ToFL32, NULL )
58 /*****************************************************************************
59 * Fixed 32 to Float 32 and backwards
60 *****************************************************************************/
61 static int Create_F32ToFL32( vlc_object_t *p_this )
63 filter_t * p_filter = (filter_t *)p_this;
65 if( ( p_filter->fmt_in.audio.i_format != VLC_CODEC_FI32
66 || p_filter->fmt_out.audio.i_format != VLC_CODEC_FL32 )
67 && ( p_filter->fmt_in.audio.i_format != VLC_CODEC_FL32
68 || p_filter->fmt_out.audio.i_format != VLC_CODEC_FI32 ) )
73 if ( !AOUT_FMTS_SIMILAR( &p_filter->fmt_in.audio, &p_filter->fmt_out.audio ) )
78 if( p_filter->fmt_in.audio.i_format == VLC_CODEC_FI32 )
80 p_filter->pf_audio_filter = Do_F32ToFL32;
84 p_filter->pf_audio_filter = Do_FL32ToF32;
90 static block_t *Do_F32ToFL32( filter_t * p_filter, block_t * p_in_buf )
93 vlc_fixed_t * p_in = (vlc_fixed_t *)p_in_buf->p_buffer;
94 float * p_out = (float *)p_in_buf->p_buffer;
96 for ( i = p_in_buf->i_nb_samples
97 * aout_FormatNbChannels( &p_filter->fmt_in.audio ) ; i-- ; )
99 *p_out++ = (float)*p_in++ / (float)FIXED32_ONE;
104 static block_t *Do_FL32ToF32( filter_t * p_filter, block_t * p_in_buf )
107 float * p_in = (float *)p_in_buf->p_buffer;
108 vlc_fixed_t * p_out = (vlc_fixed_t *)p_in_buf->p_buffer;
110 for ( i = p_in_buf->i_nb_samples
111 * aout_FormatNbChannels( &p_filter->fmt_in.audio ) ; i-- ; )
113 *p_out++ = (vlc_fixed_t)( *p_in++ * (float)FIXED32_ONE );