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;