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[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
91 // Special case for alpha rgb input
92 if ( *format == mlt_image_rgb24a )
93 {
94 register uint8_t *alpha = mlt_frame_get_alpha_mask( this );
95 register int len = *width * *height;
96 register uint8_t *bits = *image;
97 register int n = ( len + 7 ) / 8;
98
99 // TODO: Proper check for big endian systems
100 #ifndef __DARWIN__
101 bits += 3;
102 #endif
103
104 // Extract alpha mask from the image using Duff's Device
105 switch( len % 8 )
106 {
107 case 0: do { *alpha ++ = *bits; bits += 4;
108 case 7: *alpha ++ = *bits; bits += 4;
109 case 6: *alpha ++ = *bits; bits += 4;
110 case 5: *alpha ++ = *bits; bits += 4;
111 case 4: *alpha ++ = *bits; bits += 4;
112 case 3: *alpha ++ = *bits; bits += 4;
113 case 2: *alpha ++ = *bits; bits += 4;
114 case 1: *alpha ++ = *bits; bits += 4;
115 }
116 while( --n );
117 }
118 }
119
120 // Update the output
121 *image = output;
122 *format = output_format;
123 mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
124 mlt_properties_set_int( properties, "format", output_format );
125
126 // Special case for alpha rgb output
127 if ( *format == mlt_image_rgb24a )
128 {
129 // Fetch the alpha
130 register uint8_t *alpha = mlt_frame_get_alpha_mask( this );
131
132 if ( alpha != NULL )
133 {
134 register uint8_t *bits = *image;
135 register int len = *width * *height;
136 register int n = ( len + 7 ) / 8;
137
138 // TODO: Proper check for big endian systems
139 #ifndef __DARWIN__
140 bits += 3;
141 #endif
142
143 // Merge the alpha mask into the RGB image using Duff's Device
144 switch( len % 8 )
145 {
146 case 0: do { *bits = *alpha++; bits += 4;
147 case 7: *bits = *alpha++; bits += 4;
148 case 6: *bits = *alpha++; bits += 4;
149 case 5: *bits = *alpha++; bits += 4;
150 case 4: *bits = *alpha++; bits += 4;
151 case 3: *bits = *alpha++; bits += 4;
152 case 2: *bits = *alpha++; bits += 4;
153 case 1: *bits = *alpha++; bits += 4;
154 }
155 while( --n );
156 }
157 }
158 }
159 }
160 else if ( error == 0 && *format != output_format && *image != NULL && output_format == mlt_image_opengl )
161 {
162 if ( *format == mlt_image_yuv422 )
163 {
164 int size = *width * *height * 4;
165 uint8_t *output = mlt_pool_alloc( size );
166 int h = *height;
167 int w = *width;
168 uint8_t *o = output + size;
169 int ostride = w * 4;
170 uint8_t *p = *image;
171 uint8_t *alpha = mlt_frame_get_alpha_mask( this ) + *width * *height;
172 int r, g, b;
173
174 while( h -- )
175 {
176 w = *width;
177 o -= ostride;
178 alpha -= *width;
179 while( w >= 2 )
180 {
181 YUV2RGB( *p, *( p + 1 ), *( p + 3 ), r, g, b );
182 *o ++ = r;
183 *o ++ = g;
184 *o ++ = b;
185 *o ++ = *alpha ++;
186 YUV2RGB( *( p + 2 ), *( p + 1 ), *( p + 3 ), r, g, b );
187 *o ++ = r;
188 *o ++ = g;
189 *o ++ = b;
190 *o ++ = *alpha ++;
191 w -= 2;
192 p += 4;
193 }
194 o -= ostride;
195 alpha -= *width;
196 }
197
198 mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
199 mlt_properties_set_int( properties, "format", output_format );
200 *image = output;
201 *format = output_format;
202 }
203 }
204
205 return error;
206 }
207
208 /** Filter processing.
209 */
210
211 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
212 {
213 mlt_frame_push_service( frame, this );
214 mlt_frame_push_get_image( frame, filter_get_image );
215 return frame;
216 }
217
218 /** Constructor for the filter.
219 */
220
221 mlt_filter filter_avcolour_space_init( void *arg )
222 {
223 mlt_filter this = mlt_filter_new( );
224 if ( this != NULL )
225 this->process = filter_process;
226 return this;
227 }
228
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