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244 lines
6.6 KiB
244 lines
6.6 KiB
/*
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* filter_avcolour_space.c -- Colour space filter
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* Copyright (C) 2004-2005 Ushodaya Enterprises Limited
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* Author: Charles Yates <charles.yates@pandora.be>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "filter_avcolour_space.h"
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#include <framework/mlt_frame.h>
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// ffmpeg Header files
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#include <avformat.h>
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#ifdef SWSCALE
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#include <swscale.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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static inline int is_big_endian( )
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{
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union { int i; char c[ 4 ]; } big_endian_test;
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big_endian_test.i = 1;
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return big_endian_test.c[ 0 ] != 1;
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}
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static inline int convert_mlt_to_av_cs( mlt_image_format format )
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{
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int value = 0;
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switch( format )
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{
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case mlt_image_rgb24:
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value = PIX_FMT_RGB24;
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break;
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case mlt_image_rgb24a:
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value = PIX_FMT_RGBA32;
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break;
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case mlt_image_yuv422:
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value = PIX_FMT_YUV422;
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break;
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case mlt_image_yuv420p:
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value = PIX_FMT_YUV420P;
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break;
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case mlt_image_opengl:
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case mlt_image_none:
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fprintf( stderr, "Invalid format...\n" );
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break;
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}
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return value;
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}
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static inline void convert_image( uint8_t *out, uint8_t *in, int out_fmt, int in_fmt, int width, int height )
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{
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AVPicture input;
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AVPicture output;
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avpicture_fill( &input, in, in_fmt, width, height );
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avpicture_fill( &output, out, out_fmt, width, height );
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#ifdef SWSCALE
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struct SwsContext *context = sws_getContext( width, height, in_fmt,
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width, height, out_fmt, SWS_FAST_BILINEAR, NULL, NULL, NULL);
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sws_scale( context, input.data, input.linesize, 0, height,
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output.data, output.linesize);
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sws_freeContext( context );
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#else
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img_convert( &output, out_fmt, &input, in_fmt, width, height );
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#endif
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}
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/** Do it :-).
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*/
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static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
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{
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mlt_filter filter = mlt_frame_pop_service( this );
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mlt_properties properties = MLT_FRAME_PROPERTIES( this );
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int output_format = *format;
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mlt_image_format forced = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "forced" );
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int error = 0;
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// Allow this filter to force processing in a colour space other than requested
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*format = forced != 0 ? forced : *format;
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error = mlt_frame_get_image( this, image, format, width, height, 0 );
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if ( error == 0 && *format != output_format && *image != NULL && output_format != mlt_image_opengl )
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{
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int in_fmt = convert_mlt_to_av_cs( *format );
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int out_fmt = convert_mlt_to_av_cs( output_format );
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int size = avpicture_get_size( out_fmt, *width, *height );
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uint8_t *output = mlt_pool_alloc( size );
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convert_image( output, *image, out_fmt, in_fmt, *width, *height );
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// Special case for alpha rgb input
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if ( *format == mlt_image_rgb24a )
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{
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register uint8_t *alpha = mlt_frame_get_alpha_mask( this );
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register int len = *width * *height;
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register uint8_t *bits = *image;
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register int n = ( len + 7 ) / 8;
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if( !is_big_endian( ) )
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bits += 3;
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// Extract alpha mask from the image using Duff's Device
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switch( len % 8 )
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{
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case 0: do { *alpha ++ = *bits; bits += 4;
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case 7: *alpha ++ = *bits; bits += 4;
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case 6: *alpha ++ = *bits; bits += 4;
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case 5: *alpha ++ = *bits; bits += 4;
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case 4: *alpha ++ = *bits; bits += 4;
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case 3: *alpha ++ = *bits; bits += 4;
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case 2: *alpha ++ = *bits; bits += 4;
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case 1: *alpha ++ = *bits; bits += 4;
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}
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while( --n );
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}
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}
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// Update the output
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*image = output;
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*format = output_format;
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mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
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mlt_properties_set_int( properties, "format", output_format );
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// Special case for alpha rgb output
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if ( *format == mlt_image_rgb24a )
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{
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// Fetch the alpha
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register uint8_t *alpha = mlt_frame_get_alpha_mask( this );
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if ( alpha != NULL )
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{
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register uint8_t *bits = *image;
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register int len = *width * *height;
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register int n = ( len + 7 ) / 8;
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if( !is_big_endian( ) )
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bits += 3;
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// Merge the alpha mask into the RGB image using Duff's Device
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switch( len % 8 )
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{
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case 0: do { *bits = *alpha++; bits += 4;
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case 7: *bits = *alpha++; bits += 4;
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case 6: *bits = *alpha++; bits += 4;
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case 5: *bits = *alpha++; bits += 4;
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case 4: *bits = *alpha++; bits += 4;
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case 3: *bits = *alpha++; bits += 4;
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case 2: *bits = *alpha++; bits += 4;
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case 1: *bits = *alpha++; bits += 4;
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}
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while( --n );
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}
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}
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}
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}
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else if ( error == 0 && *format != output_format && *image != NULL && output_format == mlt_image_opengl )
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{
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if ( *format == mlt_image_yuv422 )
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{
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int size = *width * *height * 4;
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uint8_t *output = mlt_pool_alloc( size );
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int h = *height;
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int w = *width;
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uint8_t *o = output + size;
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int ostride = w * 4;
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uint8_t *p = *image;
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uint8_t *alpha = mlt_frame_get_alpha_mask( this ) + *width * *height;
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int r, g, b;
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while( h -- )
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{
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w = *width;
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o -= ostride;
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alpha -= *width;
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while( w >= 2 )
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{
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YUV2RGB( *p, *( p + 1 ), *( p + 3 ), r, g, b );
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*o ++ = r;
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*o ++ = g;
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*o ++ = b;
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*o ++ = *alpha ++;
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YUV2RGB( *( p + 2 ), *( p + 1 ), *( p + 3 ), r, g, b );
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*o ++ = r;
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*o ++ = g;
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*o ++ = b;
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*o ++ = *alpha ++;
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w -= 2;
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p += 4;
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}
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o -= ostride;
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alpha -= *width;
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}
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mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
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mlt_properties_set_int( properties, "format", output_format );
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*image = output;
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*format = output_format;
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}
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}
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return error;
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}
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/** Filter processing.
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*/
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static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
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{
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mlt_frame_push_service( frame, this );
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mlt_frame_push_get_image( frame, filter_get_image );
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return frame;
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}
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/** Constructor for the filter.
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*/
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mlt_filter filter_avcolour_space_init( void *arg )
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{
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mlt_filter this = mlt_filter_new( );
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if ( this != NULL )
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this->process = filter_process;
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return this;
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}
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