2 * filter_avcolour_space.c -- Colour space filter
3 * Copyright (C) 2004-2005 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <framework/mlt_filter.h>
22 #include <framework/mlt_frame.h>
24 // ffmpeg Header files
33 static inline int is_big_endian( )
35 union
{ int i
; char c
[ 4 ]; } big_endian_test
;
36 big_endian_test
.i
= 1;
38 return big_endian_test
.c
[ 0 ] != 1;
41 static inline int convert_mlt_to_av_cs( mlt_image_format format
)
48 value
= PIX_FMT_RGB24
;
50 case mlt_image_rgb24a
:
51 value
= PIX_FMT_RGBA32
;
53 case mlt_image_yuv422
:
54 value
= PIX_FMT_YUV422
;
56 case mlt_image_yuv420p
:
57 value
= PIX_FMT_YUV420P
;
59 case mlt_image_opengl
:
61 fprintf( stderr
, "Invalid format...\n" );
68 static inline void convert_image( uint8_t *out
, uint8_t *in
, int out_fmt
, int in_fmt
, int width
, int height
)
72 avpicture_fill( &input
, in
, in_fmt
, width
, height
);
73 avpicture_fill( &output
, out
, out_fmt
, width
, height
);
75 struct SwsContext
*context
= sws_getContext( width
, height
, in_fmt
,
76 width
, height
, out_fmt
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
77 sws_scale( context
, input
.data
, input
.linesize
, 0, height
,
78 output
.data
, output
.linesize
);
79 sws_freeContext( context
);
81 img_convert( &output
, out_fmt
, &input
, in_fmt
, width
, height
);
88 static int filter_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
90 mlt_filter filter
= mlt_frame_pop_service( this );
91 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
92 int output_format
= *format
;
93 mlt_image_format forced
= mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter
), "forced" );
96 // Allow this filter to force processing in a colour space other than requested
97 *format
= forced
!= 0 ? forced
: *format
;
99 error
= mlt_frame_get_image( this, image
, format
, width
, height
, 0 );
101 if ( error
== 0 && *format
!= output_format
&& *image
!= NULL
&& output_format
!= mlt_image_opengl
)
103 int in_fmt
= convert_mlt_to_av_cs( *format
);
104 int out_fmt
= convert_mlt_to_av_cs( output_format
);
105 int size
= avpicture_get_size( out_fmt
, *width
, *height
);
106 uint8_t *output
= mlt_pool_alloc( size
);
107 convert_image( output
, *image
, out_fmt
, in_fmt
, *width
, *height
);
109 // Special case for alpha rgb input
110 if ( *format
== mlt_image_rgb24a
)
112 register uint8_t *alpha
= mlt_frame_get_alpha_mask( this );
113 register int len
= *width
* *height
;
114 register uint8_t *bits
= *image
;
115 register int n
= ( len
+ 7 ) / 8;
117 if( !is_big_endian( ) )
120 // Extract alpha mask from the image using Duff's Device
123 case 0: do { *alpha
++ = *bits
; bits
+= 4;
124 case 7: *alpha
++ = *bits
; bits
+= 4;
125 case 6: *alpha
++ = *bits
; bits
+= 4;
126 case 5: *alpha
++ = *bits
; bits
+= 4;
127 case 4: *alpha
++ = *bits
; bits
+= 4;
128 case 3: *alpha
++ = *bits
; bits
+= 4;
129 case 2: *alpha
++ = *bits
; bits
+= 4;
130 case 1: *alpha
++ = *bits
; bits
+= 4;
138 *format
= output_format
;
139 mlt_properties_set_data( properties
, "image", output
, size
, mlt_pool_release
, NULL
);
140 mlt_properties_set_int( properties
, "format", output_format
);
142 // Special case for alpha rgb output
143 if ( *format
== mlt_image_rgb24a
)
146 register uint8_t *alpha
= mlt_frame_get_alpha_mask( this );
150 register uint8_t *bits
= *image
;
151 register int len
= *width
* *height
;
152 register int n
= ( len
+ 7 ) / 8;
154 if( !is_big_endian( ) )
157 // Merge the alpha mask into the RGB image using Duff's Device
160 case 0: do { *bits
= *alpha
++; bits
+= 4;
161 case 7: *bits
= *alpha
++; bits
+= 4;
162 case 6: *bits
= *alpha
++; bits
+= 4;
163 case 5: *bits
= *alpha
++; bits
+= 4;
164 case 4: *bits
= *alpha
++; bits
+= 4;
165 case 3: *bits
= *alpha
++; bits
+= 4;
166 case 2: *bits
= *alpha
++; bits
+= 4;
167 case 1: *bits
= *alpha
++; bits
+= 4;
174 else if ( error
== 0 && *format
!= output_format
&& *image
!= NULL
&& output_format
== mlt_image_opengl
)
176 if ( *format
== mlt_image_yuv422
)
178 int size
= *width
* *height
* 4;
179 uint8_t *output
= mlt_pool_alloc( size
);
182 uint8_t *o
= output
+ size
;
185 uint8_t *alpha
= mlt_frame_get_alpha_mask( this ) + *width
* *height
;
195 YUV2RGB( *p
, *( p
+ 1 ), *( p
+ 3 ), r
, g
, b
);
200 YUV2RGB( *( p
+ 2 ), *( p
+ 1 ), *( p
+ 3 ), r
, g
, b
);
212 mlt_properties_set_data( properties
, "image", output
, size
, mlt_pool_release
, NULL
);
213 mlt_properties_set_int( properties
, "format", output_format
);
215 *format
= output_format
;
222 /** Filter processing.
225 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
227 mlt_frame_push_service( frame
, this );
228 mlt_frame_push_get_image( frame
, filter_get_image
);
232 /** Constructor for the filter.
235 mlt_filter
filter_avcolour_space_init( void *arg
)
237 mlt_filter
this = mlt_filter_new( );
239 this->process
= filter_process
;