2 * filter_white_balance.cpp
3 * Copyright (C) 2013 Dan Dennedy <dan@dennedy.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 #include <framework/mlt.h>
25 #include "filter_glsl_manager.h"
26 #include <movit/white_balance_effect.h>
28 static double srgb8_to_linear(int c)
30 double x = c / 255.0f;
32 return (1.0/12.92f) * x;
34 return pow((x + 0.055) * (1.0/1.055f), 2.4);
38 static int get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
40 mlt_filter filter = (mlt_filter) mlt_frame_pop_service( frame );
41 mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
42 GlslManager::get_instance()->lock_service( frame );
43 Effect* effect = GlslManager::get_effect( MLT_FILTER_SERVICE( filter ), frame );
45 mlt_position position = mlt_filter_get_position( filter, frame );
46 mlt_position length = mlt_filter_get_length2( filter, frame );
47 int color_int = mlt_properties_anim_get_int( properties, "neutral_color", position, length );
49 srgb8_to_linear((color_int >> 24) & 0xff),
50 srgb8_to_linear((color_int >> 16) & 0xff),
51 srgb8_to_linear((color_int >> 8) & 0xff)
53 bool ok = effect->set_vec3( "neutral_color", (float*) &color );
54 ok |= effect->set_float( "output_color_temperature",
55 mlt_properties_anim_get_double( properties, "color_temperature", position, length ) );
58 GlslManager::get_instance()->unlock_service( frame );
59 *format = mlt_image_glsl;
60 return mlt_frame_get_image( frame, image, format, width, height, writable );
63 static mlt_frame process( mlt_filter filter, mlt_frame frame )
65 if ( !mlt_frame_is_test_card( frame ) ) {
66 if ( !GlslManager::get_effect( MLT_FILTER_SERVICE( filter ), frame ) )
67 GlslManager::add_effect( MLT_FILTER_SERVICE( filter ), frame, new WhiteBalanceEffect );
69 mlt_frame_push_service( frame, filter );
70 mlt_frame_push_get_image( frame, get_image );
76 mlt_filter filter_white_balance_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
78 mlt_filter filter = NULL;
79 GlslManager* glsl = GlslManager::get_instance();
81 if ( glsl && ( filter = mlt_filter_new() ) ) {
82 mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
83 mlt_properties_set( properties, "neutral_color", arg? arg : "#7f7f7f" );
84 mlt_properties_set_double( properties, "color_temperature", 6500.0 );
85 filter->process = process;