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50eb2ce46b613f17565db01dd866f4e89cd30288
[melted] / src / modules / avformat / filter_avcolour_space.c
1 /*
2 * filter_avcolour_space.c -- Colour space filter
3 * Copyright (C) 2004-2005 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program 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
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21 #include "filter_avcolour_space.h"
22
23 #include <framework/mlt_frame.h>
24
25 // ffmpeg Header files
26 #include <avformat.h>
27
28 #include <stdio.h>
29 #include <stdlib.h>
30
31 static inline int convert_mlt_to_av_cs( mlt_image_format format )
32 {
33 int value = 0;
34
35 switch( format )
36 {
37 case mlt_image_rgb24:
38 value = PIX_FMT_RGB24;
39 break;
40 case mlt_image_rgb24a:
41 value = PIX_FMT_RGBA32;
42 break;
43 case mlt_image_yuv422:
44 value = PIX_FMT_YUV422;
45 break;
46 case mlt_image_yuv420p:
47 value = PIX_FMT_YUV420P;
48 break;
49 case mlt_image_opengl:
50 case mlt_image_none:
51 fprintf( stderr, "Invalid format...\n" );
52 break;
53 }
54
55 return value;
56 }
57
58 static inline void convert_image( uint8_t *out, uint8_t *in, int out_fmt, int in_fmt, int width, int height )
59 {
60 AVPicture input;
61 AVPicture output;
62 avpicture_fill( &output, out, out_fmt, width, height );
63 avpicture_fill( &input, in, in_fmt, width, height );
64 img_convert( &output, out_fmt, &input, in_fmt, width, height );
65 }
66
67 /** Do it :-).
68 */
69
70 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
71 {
72 mlt_filter filter = mlt_frame_pop_service( this );
73 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
74 int output_format = *format;
75 mlt_image_format forced = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "forced" );
76 int error = 0;
77
78 // Allow this filter to force processing in a colour space other than requested
79 *format = forced != 0 ? forced : *format;
80
81 error = mlt_frame_get_image( this, image, format, width, height, 0 );
82
83 if ( error == 0 && *format != output_format && *image != NULL && output_format != mlt_image_opengl )
84 {
85 int in_fmt = convert_mlt_to_av_cs( *format );
86 int out_fmt = convert_mlt_to_av_cs( output_format );
87 int size = avpicture_get_size( out_fmt, *width, *height );
88 uint8_t *output = mlt_pool_alloc( size );
89 convert_image( output, *image, out_fmt, in_fmt, *width, *height );
90 *image = output;
91 *format = output_format;
92 mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
93 mlt_properties_set_int( properties, "format", output_format );
94
95 // Special case for alpha rgb - merge the alpha mask when it exists
96 if ( *format == mlt_image_rgb24a )
97 {
98 // Fetch the alpha
99 register uint8_t *alpha = mlt_frame_get_alpha_mask( this );
100
101 if ( alpha != NULL )
102 {
103 register uint8_t *bits = *image;
104 register int len = *width * *height;
105 register int n = ( len + 7 ) / 8;
106
107 // TODO: Proper check for big endian systems
108 #ifndef __DARWIN__
109 bits += 3;
110 #endif
111
112 // Merge the alpha mask into the RGB image using Duff's Device
113 switch( len % 8 )
114 {
115 case 0: do { *bits = *alpha++; bits += 4;
116 case 7: *bits = *alpha++; bits += 4;
117 case 6: *bits = *alpha++; bits += 4;
118 case 5: *bits = *alpha++; bits += 4;
119 case 4: *bits = *alpha++; bits += 4;
120 case 3: *bits = *alpha++; bits += 4;
121 case 2: *bits = *alpha++; bits += 4;
122 case 1: *bits = *alpha++; bits += 4;
123 }
124 while( --n );
125 }
126 }
127 }
128 }
129 else if ( error == 0 && *format != output_format && *image != NULL && output_format == mlt_image_opengl )
130 {
131 if ( *format == mlt_image_yuv422 )
132 {
133 int size = *width * *height * 4;
134 uint8_t *output = mlt_pool_alloc( size );
135 int h = *height;
136 int w = *width;
137 uint8_t *o = output + size;
138 int ostride = w * 4;
139 uint8_t *p = *image;
140 uint8_t *alpha = mlt_frame_get_alpha_mask( this ) + *width * *height;
141 int r, g, b;
142
143 while( h -- )
144 {
145 w = *width;
146 o -= ostride;
147 alpha -= *width;
148 while( w >= 2 )
149 {
150 YUV2RGB( *p, *( p + 1 ), *( p + 3 ), r, g, b );
151 *o ++ = r;
152 *o ++ = g;
153 *o ++ = b;
154 *o ++ = *alpha ++;
155 YUV2RGB( *( p + 2 ), *( p + 1 ), *( p + 3 ), r, g, b );
156 *o ++ = r;
157 *o ++ = g;
158 *o ++ = b;
159 *o ++ = *alpha ++;
160 w -= 2;
161 p += 4;
162 }
163 o -= ostride;
164 alpha -= *width;
165 }
166
167 mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
168 mlt_properties_set_int( properties, "format", output_format );
169 *image = output;
170 *format = output_format;
171 }
172 }
173
174 return error;
175 }
176
177 /** Filter processing.
178 */
179
180 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
181 {
182 mlt_frame_push_service( frame, this );
183 mlt_frame_push_get_image( frame, filter_get_image );
184 return frame;
185 }
186
187 /** Constructor for the filter.
188 */
189
190 mlt_filter filter_avcolour_space_init( void *arg )
191 {
192 mlt_filter this = mlt_filter_new( );
193 if ( this != NULL )
194 this->process = filter_process;
195 return this;
196 }
197
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