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 "filter_avcolour_space.h"
23 #include <framework/mlt_frame.h>
25 // ffmpeg Header files
34 static inline int is_big_endian( )
36 union
{ int i
; char c
[ 4 ]; } big_endian_test
;
37 big_endian_test
.i
= 1;
39 return big_endian_test
.c
[ 0 ] != 1;
42 static inline int convert_mlt_to_av_cs( mlt_image_format format
)
49 value
= PIX_FMT_RGB24
;
51 case mlt_image_rgb24a
:
52 value
= PIX_FMT_RGBA32
;
54 case mlt_image_yuv422
:
55 value
= PIX_FMT_YUV422
;
57 case mlt_image_yuv420p
:
58 value
= PIX_FMT_YUV420P
;
60 case mlt_image_opengl
:
62 fprintf( stderr
, "Invalid format...\n" );
69 static inline void convert_image( uint8_t *out
, uint8_t *in
, int out_fmt
, int in_fmt
, int width
, int height
)
73 avpicture_fill( &input
, in
, in_fmt
, width
, height
);
74 avpicture_fill( &output
, out
, out_fmt
, width
, height
);
76 struct SwsContext
*context
= sws_getContext( width
, height
, in_fmt
,
77 width
, height
, out_fmt
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
78 sws_scale( context
, input
.data
, input
.linesize
, 0, height
,
79 output
.data
, output
.linesize
);
80 sws_freeContext( context
);
82 img_convert( &output
, out_fmt
, &input
, in_fmt
, width
, height
);
89 static int filter_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
91 mlt_filter filter
= mlt_frame_pop_service( this );
92 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
93 int output_format
= *format
;
94 mlt_image_format forced
= mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter
), "forced" );
97 // Allow this filter to force processing in a colour space other than requested
98 *format
= forced
!= 0 ? forced
: *format
;
100 error
= mlt_frame_get_image( this, image
, format
, width
, height
, 0 );
102 if ( error
== 0 && *format
!= output_format
&& *image
!= NULL
&& output_format
!= mlt_image_opengl
)
104 int in_fmt
= convert_mlt_to_av_cs( *format
);
105 int out_fmt
= convert_mlt_to_av_cs( output_format
);
106 int size
= avpicture_get_size( out_fmt
, *width
, *height
);
107 uint8_t *output
= mlt_pool_alloc( size
);
108 convert_image( output
, *image
, out_fmt
, in_fmt
, *width
, *height
);
110 // Special case for alpha rgb input
111 if ( *format
== mlt_image_rgb24a
)
113 register uint8_t *alpha
= mlt_frame_get_alpha_mask( this );
114 register int len
= *width
* *height
;
115 register uint8_t *bits
= *image
;
116 register int n
= ( len
+ 7 ) / 8;
118 if( !is_big_endian( ) )
121 // Extract alpha mask from the image using Duff's Device
124 case 0: do { *alpha
++ = *bits
; bits
+= 4;
125 case 7: *alpha
++ = *bits
; bits
+= 4;
126 case 6: *alpha
++ = *bits
; bits
+= 4;
127 case 5: *alpha
++ = *bits
; bits
+= 4;
128 case 4: *alpha
++ = *bits
; bits
+= 4;
129 case 3: *alpha
++ = *bits
; bits
+= 4;
130 case 2: *alpha
++ = *bits
; bits
+= 4;
131 case 1: *alpha
++ = *bits
; bits
+= 4;
139 *format
= output_format
;
140 mlt_properties_set_data( properties
, "image", output
, size
, mlt_pool_release
, NULL
);
141 mlt_properties_set_int( properties
, "format", output_format
);
143 // Special case for alpha rgb output
144 if ( *format
== mlt_image_rgb24a
)
147 register uint8_t *alpha
= mlt_frame_get_alpha_mask( this );
151 register uint8_t *bits
= *image
;
152 register int len
= *width
* *height
;
153 register int n
= ( len
+ 7 ) / 8;
155 if( !is_big_endian( ) )
158 // Merge the alpha mask into the RGB image using Duff's Device
161 case 0: do { *bits
= *alpha
++; bits
+= 4;
162 case 7: *bits
= *alpha
++; bits
+= 4;
163 case 6: *bits
= *alpha
++; bits
+= 4;
164 case 5: *bits
= *alpha
++; bits
+= 4;
165 case 4: *bits
= *alpha
++; bits
+= 4;
166 case 3: *bits
= *alpha
++; bits
+= 4;
167 case 2: *bits
= *alpha
++; bits
+= 4;
168 case 1: *bits
= *alpha
++; bits
+= 4;
175 else if ( error
== 0 && *format
!= output_format
&& *image
!= NULL
&& output_format
== mlt_image_opengl
)
177 if ( *format
== mlt_image_yuv422
)
179 int size
= *width
* *height
* 4;
180 uint8_t *output
= mlt_pool_alloc( size
);
183 uint8_t *o
= output
+ size
;
186 uint8_t *alpha
= mlt_frame_get_alpha_mask( this ) + *width
* *height
;
196 YUV2RGB( *p
, *( p
+ 1 ), *( p
+ 3 ), r
, g
, b
);
201 YUV2RGB( *( p
+ 2 ), *( p
+ 1 ), *( p
+ 3 ), r
, g
, b
);
213 mlt_properties_set_data( properties
, "image", output
, size
, mlt_pool_release
, NULL
);
214 mlt_properties_set_int( properties
, "format", output_format
);
216 *format
= output_format
;
223 /** Filter processing.
226 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
228 mlt_frame_push_service( frame
, this );
229 mlt_frame_push_get_image( frame
, filter_get_image
);
233 /** Constructor for the filter.
236 mlt_filter
filter_avcolour_space_init( void *arg
)
238 mlt_filter
this = mlt_filter_new( );
240 this->process
= filter_process
;