2 * filter_audiowave.c -- display audio waveform
3 * Copyright (C) 2010 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <framework/mlt_filter.h>
22 #include <framework/mlt_frame.h>
30 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
32 int size = *width * *height * 2;
33 *format = mlt_image_yuv422;
34 *image = mlt_pool_alloc( size );
35 mlt_frame_set_image( this, *image, size, mlt_pool_release );
36 uint8_t *wave = mlt_frame_get_waveform( this, *width, *height );
40 uint8_t *q = *image + *width * *height * 2;
49 return ( wave == NULL );
52 /** Filter processing.
55 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
57 mlt_frame_push_get_image( frame, filter_get_image );
61 /** Constructor for the filter.
64 mlt_filter filter_audiowave_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
66 mlt_filter this = mlt_filter_new( );
68 this->process = filter_process;