+/*****************************************************************************
+ * trivial.c : trivial resampler (skips samples or pads with zeroes)
+ *****************************************************************************
+ * Copyright (C) 2002 VideoLAN
+ * $Id: trivial.c,v 1.1 2002/08/09 23:47:22 massiot Exp $
+ *
+ * Authors: Christophe Massiot <massiot@via.ecp.fr>
+ *
+ * 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 trivial resampling") );
+ set_capability( "audio filter", 1 );
+ 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;
+
+ 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_in_nb = p_in_buf->i_nb_samples;
+ int i_out_nb = i_in_nb * p_filter->output.i_rate
+ / p_filter->input.i_rate;
+
+ if ( p_out_buf != p_in_buf )
+ {
+ /* For whatever reason the buffer allocator decided to allocate
+ * a new buffer. */
+ p_aout->p_vlc->pf_memcpy( p_out_buf->p_buffer, p_in_buf->p_buffer,
+ __MIN(i_out_nb, i_in_nb) );
+ }
+
+ if ( i_out_nb > i_in_nb )
+ {
+ /* Pad with zeroes. */
+ memset( p_out_buf->p_buffer + i_in_nb, 0, i_out_nb - i_in_nb );
+ }
+
+ p_out_buf->i_nb_samples = i_out_nb;
+}
+