--- /dev/null
+/*****************************************************************************
+ * s16tofixed32.c : converter from signed 16 bits integer to fixed 32
+ *****************************************************************************
+ * Copyright (C) 2002 VideoLAN
+ * $Id: s16tofixed32.c,v 1.1 2003/03/12 23:59:19 marcari Exp $
+ *
+ * Authors: Marc Ariberti <marcari@videolan.ord>
+ *
+ * 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 <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( _("audio filter for s16->fixed32 conversion") );
+ set_capability( "audio filter", 15 );
+ set_callbacks( Create, NULL );
+vlc_module_end();
+
+/*****************************************************************************
+ * Create: allocate filter
+ *****************************************************************************
+ * This function allocates and initializes a s16->fixed32 audio filter.
+ *****************************************************************************/
+static int Create( vlc_object_t *p_this )
+{
+ aout_filter_t * p_filter = (aout_filter_t *)p_this;
+
+ if ( p_filter->output.i_format != VLC_FOURCC('f','i','3','2')
+ || p_filter->input.i_format != AOUT_FMT_S16_NE )
+ {
+ return -1;
+ }
+
+ if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
+ {
+ return -1;
+ }
+
+ p_filter->pf_do_work = DoWork;
+ p_filter->b_in_place = 1;
+
+ 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 = p_in_buf->i_nb_samples * aout_FormatNbChannels( &p_filter->input );
+
+ /* We start from the end because b_in_place is true */
+ s16 * p_in = (s16 *)p_in_buf->p_buffer + i - 1;
+ vlc_fixed_t * p_out = (vlc_fixed_t *)p_out_buf->p_buffer + i - 1;
+
+ while( i-- )
+ {
+ *p_out = (vlc_fixed_t)( (int32_t)(*p_in) * (FIXED32_ONE >> 16) );
+ p_in--; p_out--;
+ }
+
+ p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
+ p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes
+ * sizeof(vlc_fixed_t) / sizeof(s16);
+}