1 /*****************************************************************************
2 * float.c: Floating point audio format conversions
3 *****************************************************************************
4 * Copyright (C) 2002, 2006 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>
45 /*****************************************************************************
47 *****************************************************************************/
48 static int Create_F32ToFL32 ( vlc_object_t * );
49 static void Do_F32ToFL32( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
51 static void Do_FL32ToF32 ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
54 /*****************************************************************************
56 *****************************************************************************/
58 set_description( N_("Floating-point audio format conversions") )
60 set_capability( "audio filter", 10 )
61 set_callbacks( Create_F32ToFL32, NULL )
64 /*****************************************************************************
65 * Fixed 32 to Float 32 and backwards
66 *****************************************************************************/
67 static int Create_F32ToFL32( vlc_object_t *p_this )
69 aout_filter_t * p_filter = (aout_filter_t *)p_this;
71 if( ( p_filter->fmt_in.audio.i_format != VLC_CODEC_FI32
72 || p_filter->fmt_out.audio.i_format != VLC_CODEC_FL32 )
73 && ( p_filter->fmt_in.audio.i_format != VLC_CODEC_FL32
74 || p_filter->fmt_out.audio.i_format != VLC_CODEC_FI32 ) )
79 if ( !AOUT_FMTS_SIMILAR( &p_filter->fmt_in.audio, &p_filter->fmt_out.audio ) )
84 if( p_filter->fmt_in.audio.i_format == VLC_CODEC_FI32 )
86 p_filter->pf_do_work = Do_F32ToFL32;
90 p_filter->pf_do_work = Do_FL32ToF32;
93 p_filter->b_in_place = 1;
98 static void Do_F32ToFL32( aout_instance_t * p_aout, aout_filter_t * p_filter,
99 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
103 vlc_fixed_t * p_in = (vlc_fixed_t *)p_in_buf->p_buffer;
104 float * p_out = (float *)p_out_buf->p_buffer;
106 for ( i = p_in_buf->i_nb_samples
107 * aout_FormatNbChannels( &p_filter->fmt_in.audio ) ; i-- ; )
109 *p_out++ = (float)*p_in++ / (float)FIXED32_ONE;
112 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
113 p_out_buf->i_buffer = p_in_buf->i_buffer;
116 static void Do_FL32ToF32( aout_instance_t * p_aout, aout_filter_t * p_filter,
117 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
121 float * p_in = (float *)p_in_buf->p_buffer;
122 vlc_fixed_t * p_out = (vlc_fixed_t *)p_out_buf->p_buffer;
124 for ( i = p_in_buf->i_nb_samples
125 * aout_FormatNbChannels( &p_filter->fmt_in.audio ) ; i-- ; )
127 *p_out++ = (vlc_fixed_t)( *p_in++ * (float)FIXED32_ONE );
130 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
131 p_out_buf->i_buffer = p_in_buf->i_buffer;