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104 lines
3.0 KiB
104 lines
3.0 KiB
/*
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* filter_brightness.c -- gamma filter
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* Copyright (C) 2003-2004 Ushodaya Enterprises Limited
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* Author: Charles Yates <charles.yates@pandora.be>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "filter_brightness.h"
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#include <framework/mlt_frame.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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/** Do it :-).
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*/
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static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
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{
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// Get the image
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int error = mlt_frame_get_image( this, image, format, width, height, 1 );
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// Only process if we have no error and a valid colour space
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if ( error == 0 && *format == mlt_image_yuv422 )
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{
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// Get the brightness level
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double level = mlt_properties_get_double( MLT_FRAME_PROPERTIES( this ), "brightness" );
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// Only process if level is something other than 1
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if ( level != 1.0 )
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{
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uint8_t *p = *image;
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uint8_t *q = *image + *width * *height * 2;
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int32_t x = 0;
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int32_t m = level * ( 1 << 16 );
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while ( p != q )
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{
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x = ( *p * m ) >> 16;
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*p = x < 16 ? 16 : x > 235 ? 235 : x;
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p += 2;
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}
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}
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}
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return error;
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}
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/** Filter processing.
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*/
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static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
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{
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// Get the starting brightness level
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double level = fabs( mlt_properties_get_double( MLT_FILTER_PROPERTIES( this ), "start" ) );
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// If there is an end adjust gain to the range
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if ( mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "end" ) != NULL )
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{
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// Determine the time position of this frame in the transition duration
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mlt_position in = mlt_filter_get_in( this );
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mlt_position out = mlt_filter_get_out( this );
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mlt_position time = mlt_frame_get_position( frame );
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double position = ( double )( time - in ) / ( double )( out - in + 1 );
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double end = fabs( mlt_properties_get_double( MLT_FILTER_PROPERTIES( this ), "end" ) );
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level += ( end - level ) * position;
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}
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// Push the frame filter
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mlt_properties_set_double( MLT_FRAME_PROPERTIES( frame ), "brightness", level );
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mlt_frame_push_get_image( frame, filter_get_image );
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return frame;
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}
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/** Constructor for the filter.
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*/
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mlt_filter filter_brightness_init( char *arg )
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{
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mlt_filter this = mlt_filter_new( );
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if ( this != NULL )
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{
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this->process = filter_process;
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mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "start", arg == NULL ? "1" : arg );
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}
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return this;
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}
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