Added fixed32tofloat32 conversion.

modules/audio_filter/converter/fixed32tofloat32.c

+/*****************************************************************************
+ * fixed32float32.c : converter from fixed32 to float32 bits integer
+ *****************************************************************************
+ * Copyright (C) 2002 VideoLAN
+ * $Id: fixed32tofloat32.c,v 1.1 2002/08/12 20:35:18 jpsaman Exp $
+ *
+ * Authors: Jean-Paul Saman <jpsaman@wxs.nl>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <errno.h>
+#include <stdlib.h>                                      /* malloc(), free() */
+#include <string.h>
+
+#include <vlc/vlc.h>
+#include "audio_output.h"
+#include "aout_internal.h"
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int  Create    ( vlc_object_t * );
+
+static void DoWork    ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
+                        aout_buffer_t * );
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+    set_description( _("aout filter for fixed32->float32 conversion") );
+    set_capability( "audio filter", 10 );
+    set_callbacks( Create, NULL );
+vlc_module_end();
+
+/*****************************************************************************
+ * Create: allocate trivial mixer
+ *****************************************************************************
+ * This function allocates and initializes a Crop vout method.
+ *****************************************************************************/
+static int Create( vlc_object_t *p_this )
+{
+    aout_filter_t * p_filter = (aout_filter_t *)p_this;
+
+    if ( p_filter->input.i_format != AOUT_FMT_FIXED32
+          && p_filter->output.i_format != AOUT_FMT_FLOAT32 )
+    {
+        return -1;
+    }
+
+    if ( p_filter->input.i_rate != p_filter->output.i_rate
+          || p_filter->input.i_channels != p_filter->output.i_channels )
+    {
+        return -1;
+    }
+
+    p_filter->pf_do_work = DoWork;
+    p_filter->b_in_place = 1;
+
+    printf( "fixed32tofloat32 spawned.\n" );
+
+    return 0;
+}
+
+/*****************************************************************************
+ * DoWork: convert a buffer
+ *****************************************************************************/
+static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
+                    aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
+{
+    int i;
+    vlc_fixed_t * p_in = (vlc_fixed_t *)p_in_buf->p_buffer;
+    float * p_out = (float *)p_out_buf->p_buffer;
+
+    for ( i = 0; i < p_in_buf->i_nb_samples * p_filter->input.i_channels; i++ )
+    {
+//        if ( *p_in >= 1.0 ) *p_out = 32767;
+//        else if ( *p_in < -1.0 ) *p_out = -32768;
+//        else *p_out = *p_in * 32768.0;
+        *p_out = (float) *p_in;
+        p_in++; p_out++;
+    }
+
+    p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
+}
+