1 /*****************************************************************************
2 * float32tou16.c : converter from float32 to unsigned 16 bits integer
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: float32tou16.c,v 1.1 2002/08/13 22:42:23 massiot Exp $
7 * Authors: Xavier Maillard <zedek@fxgsproject.org>
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 *****************************************************************************/
28 #include <stdlib.h> /* malloc(), free() */
32 #include "audio_output.h"
33 #include "aout_internal.h"
35 /*****************************************************************************
37 *****************************************************************************/
38 static int Create ( vlc_object_t * );
40 static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
43 /*****************************************************************************
45 *****************************************************************************/
47 set_description( _("aout filter for float32->u16 conversion") );
48 set_capability( "audio filter", 1 );
49 set_callbacks( Create, NULL );
52 /*****************************************************************************
53 * Create: allocate trivial mixer
54 *****************************************************************************
55 * This function allocates and initializes a Crop vout method.
56 *****************************************************************************/
57 static int Create( vlc_object_t *p_this )
59 aout_filter_t * p_filter = (aout_filter_t *)p_this;
61 if ( p_filter->input.i_format != AOUT_FMT_FLOAT32
62 && p_filter->output.i_format != AOUT_FMT_U16_NE )
67 if ( p_filter->input.i_rate != p_filter->output.i_rate
68 || p_filter->input.i_channels != p_filter->output.i_channels )
73 p_filter->pf_do_work = DoWork;
74 p_filter->b_in_place = 1;
79 /*****************************************************************************
80 * DoWork: convert a buffer
81 *****************************************************************************/
82 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
83 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
86 float * p_in = (float *)p_in_buf->p_buffer;
87 u16 * p_out = (u16 *)p_out_buf->p_buffer;
89 for ( i = 0; i < p_in_buf->i_nb_samples * p_filter->input.i_channels; i++ )
91 if ( *p_in >= 1.0 ) *p_out = 65535;
92 else if ( *p_in < -1.0 ) *p_out = 0;
93 else *p_out = (u16)(32768 + *p_in * 32768);
97 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;