1 /*****************************************************************************
2 * fixed32float32.c : converter from fixed32 to float32 bits integer
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: fixed32tofloat32.c,v 1.11 2002/11/20 16:43:32 sam Exp $
7 * Authors: Jean-Paul Saman <jpsaman@wxs.nl>
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
31 #include "audio_output.h"
32 #include "aout_internal.h"
34 /*****************************************************************************
36 *****************************************************************************/
37 static int Create ( vlc_object_t * );
39 static void FixedToFloat ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
41 static void FloatToFixed ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
44 /*****************************************************************************
46 *****************************************************************************/
48 set_description( _("audio filter for fixed32<->float32 conversion") );
49 set_capability( "audio filter", 10 );
50 set_callbacks( Create, NULL );
53 /*****************************************************************************
54 * Create: allocate trivial mixer
55 *****************************************************************************
56 * This function allocates and initializes a Crop vout method.
57 *****************************************************************************/
58 static int Create( vlc_object_t *p_this )
60 aout_filter_t * p_filter = (aout_filter_t *)p_this;
62 if( ( p_filter->input.i_format != VLC_FOURCC('f','i','3','2')
63 || p_filter->output.i_format != VLC_FOURCC('f','l','3','2') )
64 && ( p_filter->input.i_format != VLC_FOURCC('f','l','3','2')
65 || p_filter->output.i_format != VLC_FOURCC('f','i','3','2') ) )
70 if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
75 if( p_filter->input.i_format == VLC_FOURCC('f','i','3','2') )
77 p_filter->pf_do_work = FixedToFloat;
81 p_filter->pf_do_work = FloatToFixed;
84 p_filter->b_in_place = 1;
89 /*****************************************************************************
90 * FixedToFloat: convert a buffer
91 *****************************************************************************/
92 static void FixedToFloat( aout_instance_t * p_aout, aout_filter_t * p_filter,
93 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
96 vlc_fixed_t * p_in = (vlc_fixed_t *)p_in_buf->p_buffer;
97 float * p_out = (float *)p_out_buf->p_buffer;
99 for ( i = p_in_buf->i_nb_samples
100 * aout_FormatNbChannels( &p_filter->input ) ; i-- ; )
102 *p_out++ = (float)*p_in++ / (float)FIXED32_ONE;
105 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
106 p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes;
109 /*****************************************************************************
110 * FloatToFixed: convert a buffer
111 *****************************************************************************/
112 static void FloatToFixed( aout_instance_t * p_aout, aout_filter_t * p_filter,
113 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
116 float * p_in = (float *)p_in_buf->p_buffer;
117 vlc_fixed_t * p_out = (vlc_fixed_t *)p_out_buf->p_buffer;
119 for ( i = p_in_buf->i_nb_samples
120 * aout_FormatNbChannels( &p_filter->input ) ; i-- ; )
122 *p_out++ = (vlc_fixed_t)( *p_in++ * (float)FIXED32_ONE );
125 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
126 p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes;