+++ /dev/null
-/*
- * filter_obscure.c -- obscure filter
- * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
- * Author: Charles Yates <charles.yates@pandora.be>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#include <framework/mlt_filter.h>
-#include <framework/mlt_frame.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-
-/** Geometry struct.
-*/
-
-struct geometry_s
-{
- int nw;
- int nh;
- float x;
- float y;
- float w;
- float h;
- int mask_w;
- int mask_h;
-};
-
-/** Parse a value from a geometry string.
-*/
-
-static inline float parse_value( char **ptr, int normalisation, char delim, float defaults )
-{
- float value = defaults;
-
- if ( *ptr != NULL && **ptr != '\0' )
- {
- char *end = NULL;
- value = strtod( *ptr, &end );
- if ( end != NULL )
- {
- if ( *end == '%' )
- value = ( value / 100.0 ) * normalisation;
- while ( *end == delim || *end == '%' )
- end ++;
- }
- *ptr = end;
- }
-
- return value;
-}
-
-/** Parse a geometry property string.
-*/
-
-static void geometry_parse( struct geometry_s *geometry, struct geometry_s *defaults, char *property, int nw, int nh )
-{
- // Assign normalised width and height
- geometry->nw = nw;
- geometry->nh = nh;
-
- // Assign from defaults if available
- if ( defaults != NULL )
- {
- geometry->x = defaults->x;
- geometry->y = defaults->y;
- geometry->w = defaults->w;
- geometry->h = defaults->h;
- geometry->mask_w = defaults->mask_w;
- geometry->mask_h = defaults->mask_h;
- }
- else
- {
- geometry->x = 0;
- geometry->y = 0;
- geometry->w = nw;
- geometry->h = nh;
- geometry->mask_w = 20;
- geometry->mask_h = 20;
- }
-
- // Parse the geomtry string
- if ( property != NULL )
- {
- char *ptr = property;
- geometry->x = parse_value( &ptr, nw, ',', geometry->x );
- geometry->y = parse_value( &ptr, nh, ':', geometry->y );
- geometry->w = parse_value( &ptr, nw, 'x', geometry->w );
- geometry->h = parse_value( &ptr, nh, ':', geometry->h );
- geometry->mask_w = parse_value( &ptr, nw, 'x', geometry->mask_w );
- geometry->mask_h = parse_value( &ptr, nh, ' ', geometry->mask_h );
- }
-}
-
-/** A Timism but not as clean ;-).
-*/
-
-static float lerp( float value, float lower, float upper )
-{
- if ( value < lower )
- return lower;
- else if ( value > upper )
- return upper;
- return value;
-}
-
-/** Calculate real geometry.
-*/
-
-static void geometry_calculate( struct geometry_s *output, struct geometry_s *in, struct geometry_s *out, float position, int ow, int oh )
-{
- // Calculate this frames geometry
- output->x = lerp( ( in->x + ( out->x - in->x ) * position ) / ( float )out->nw * ow, 0, ow );
- output->y = lerp( ( in->y + ( out->y - in->y ) * position ) / ( float )out->nh * oh, 0, oh );
- output->w = lerp( ( in->w + ( out->w - in->w ) * position ) / ( float )out->nw * ow, 0, ow - output->x );
- output->h = lerp( ( in->h + ( out->h - in->h ) * position ) / ( float )out->nh * oh, 0, oh - output->y );
- output->mask_w = in->mask_w + ( out->mask_w - in->mask_w ) * position;
- output->mask_h = in->mask_h + ( out->mask_h - in->mask_h ) * position;
-}
-
-/** Calculate the position for this frame.
-*/
-
-static float position_calculate( mlt_filter this, mlt_frame frame )
-{
- // Get the in and out position
- mlt_position in = mlt_filter_get_in( this );
- mlt_position out = mlt_filter_get_out( this );
-
- // Get the position of the frame
- mlt_position position = mlt_frame_get_position( frame );
-
- // Now do the calcs
- return ( float )( position - in ) / ( float )( out - in + 1 );
-}
-
-/** The averaging function...
-*/
-
-static inline void obscure_average( uint8_t *start, int width, int height, int stride )
-{
- register int y;
- register int x;
- register int Y = ( *start + *( start + 2 ) ) / 2;
- register int U = *( start + 1 );
- register int V = *( start + 3 );
- register uint8_t *p;
- register int components = width >> 1;
-
- y = height;
- while( y -- )
- {
- p = start;
- x = components;
- while( x -- )
- {
- Y = ( Y + *p ++ ) >> 1;
- U = ( U + *p ++ ) >> 1;
- Y = ( Y + *p ++ ) >> 1;
- V = ( V + *p ++ ) >> 1;
- }
- start += stride;
- }
-
- start -= height * stride;
- y = height;
- while( y -- )
- {
- p = start;
- x = components;
- while( x -- )
- {
- *p ++ = Y;
- *p ++ = U;
- *p ++ = Y;
- *p ++ = V;
- }
- start += stride;
- }
-}
-
-
-/** The obscurer rendering function...
-*/
-
-static void obscure_render( uint8_t *image, int width, int height, struct geometry_s result )
-{
- int area_x = result.x;
- int area_y = result.y;
- int area_w = result.w;
- int area_h = result.h;
-
- int mw = result.mask_w;
- int mh = result.mask_h;
- int w;
- int h;
- int aw;
- int ah;
-
- uint8_t *p = image + area_y * width * 2 + area_x * 2;
-
- for ( w = 0; w < area_w; w += mw )
- {
- for ( h = 0; h < area_h; h += mh )
- {
- aw = w + mw > area_w ? mw - ( w + mw - area_w ) : mw;
- ah = h + mh > area_h ? mh - ( h + mh - area_h ) : mh;
- if ( aw > 1 && ah > 1 )
- obscure_average( p + h * ( width << 1 ) + ( w << 1 ), aw, ah, width << 1 );
- }
- }
-}
-
-/** Do it :-).
-*/
-
-static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
-{
- // Get the frame properties
- mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
-
- // Pop the top of stack now
- mlt_filter this = mlt_frame_pop_service( frame );
-
- // Get the image from the frame
- int error = mlt_frame_get_image( frame, image, format, width, height, 1 );
-
- // Get the image from the frame
- if ( error == 0 && *format == mlt_image_yuv422 )
- {
- if ( this != NULL )
- {
- // Get the filter properties
- mlt_properties properties = MLT_FILTER_PROPERTIES( this );
-
- // Obtain the normalised width and height from the frame
- int normalised_width = mlt_properties_get_int( frame_properties, "normalised_width" );
- int normalised_height = mlt_properties_get_int( frame_properties, "normalised_height" );
-
- // Structures for geometry
- struct geometry_s result;
- struct geometry_s start;
- struct geometry_s end;
-
- // Retrieve the position
- float position = mlt_properties_get_double(frame_properties, "filter_position");
-
- // Now parse the geometries
- geometry_parse( &start, NULL, mlt_properties_get( properties, "start" ), normalised_width, normalised_height );
- geometry_parse( &end, &start, mlt_properties_get( properties, "end" ), normalised_width, normalised_height );
-
- // Do the calculation
- geometry_calculate( &result, &start, &end, position, *width, *height );
-
- // Now actually render it
- obscure_render( *image, *width, *height, result );
- }
- }
-
- return error;
-}
-
-/** Filter processing.
-*/
-
-static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
-{
- // Push this on to the service stack
- mlt_frame_push_service( frame, this );
-
- // Calculate the position for the filter effect
- float position = position_calculate( this, frame );
- mlt_properties_set_double( MLT_FRAME_PROPERTIES( frame ), "filter_position", position );
-
- // Push the get image call
- mlt_frame_push_get_image( frame, filter_get_image );
-
- return frame;
-}
-
-/** Constructor for the filter.
-*/
-
-mlt_filter filter_obscure_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
-{
- mlt_filter this = mlt_filter_new( );
- if ( this != NULL )
- {
- mlt_properties properties = MLT_FILTER_PROPERTIES( this );
- this->process = filter_process;
- mlt_properties_set( properties, "start", arg != NULL ? arg : "0%,0%:100%x100%" );
- mlt_properties_set( properties, "end", "" );
- }
- return this;
-}
-
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