/*
 * filter_sepia.c -- sepia filter
 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
 * Author: Charles Yates <charles.yates@pandora.be>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <framework/mlt_filter.h>
#include <framework/mlt_frame.h>

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

/** Do it :-).
*/

static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
{
	// Get the filter
	mlt_filter filter = mlt_frame_pop_service( this );

	// Get the image
	int error = mlt_frame_get_image( this, image, format, width, height, 1 );

	// Only process if we have no error and a valid colour space
	if ( error == 0 && *image && *format == mlt_image_yuv422 )
	{
		// We modify the whole image
		uint8_t *p = *image;
		int h = *height;
		int uneven = *width % 2;
		int w = ( *width - uneven ) / 2;
		int t;

		// Get u and v values
		int u = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "u" );
		int v = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "v" );

		// Loop through image
		while( h -- )
		{
			t = w;
			while( t -- )
			{
				p ++;
				*p ++ = u;
				p ++;
				*p ++ = v;
			}
			if ( uneven )
			{
				p ++;
				*p ++ = u;
			}
		}
	}

	return error;
}

/** Filter processing.
*/

static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
{
	// Push the frame filter
	mlt_frame_push_service( frame, this );
	mlt_frame_push_get_image( frame, filter_get_image );
	return frame;
}

/** Constructor for the filter.
*/

mlt_filter filter_sepia_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
{
	mlt_filter this = mlt_filter_new( );
	if ( this != NULL )
	{
		this->process = filter_process;
		mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "u", "75" );
		mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "v", "150" );
	}
	return this;
}