/* * transition_region.c -- region transition * Copyright (C) 2003-2004 Ushodaya Enterprises Limited * Author: Charles Yates * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "transition_region.h" #include "transition_composite.h" #include #include #include #include static int create_instance( mlt_transition this, char *name, char *value, int count ) { // Return from this function int error = 0; // Duplicate the value char *type = strdup( value ); // Pointer to filter argument char *arg = type == NULL ? NULL : strchr( type, ':' ); // New filter being created mlt_filter filter = NULL; // Cleanup type and arg if ( arg != NULL ) *arg ++ = '\0'; // Create the filter filter = mlt_factory_filter( type, arg ); // If we have a filter, then initialise and store it if ( filter != NULL ) { // Properties of this mlt_properties properties = mlt_transition_properties( this ); // String to hold the property name char id[ 256 ]; // String to hold the passdown key char key[ 256 ]; // Construct id sprintf( id, "_filter_%d", count ); // Counstruct key sprintf( key, "%s.", name ); // Just in case, let's assume that the filter here has a composite mlt_properties_set( mlt_filter_properties( filter ), "composite.start", "0%,0%:100%x100%" ); mlt_properties_set( mlt_filter_properties( filter ), "composite.fill", "true" ); // Pass all the key properties on the filter down mlt_properties_pass( mlt_filter_properties( filter ), properties, key ); // Ensure that filter is assigned mlt_properties_set_data( properties, id, filter, 0, ( mlt_destructor )mlt_filter_close, NULL ); } else { // Indicate that an error has occurred error = 1; } // Cleanup free( type ); // Return error condition return error; } static uint8_t *filter_get_alpha_mask( mlt_frame this ) { // Obtain properties of frame mlt_properties properties = mlt_frame_properties( this ); // Get the shape frame mlt_frame shape_frame = mlt_properties_get_data( properties, "shape_frame", NULL ); // Get the width and height of the image int region_width = mlt_properties_get_int( mlt_frame_properties( this ), "width" ); int region_height = mlt_properties_get_int( mlt_frame_properties( this ), "height" ); uint8_t *image = NULL; mlt_image_format format = mlt_image_yuv422; // Get the shape image to trigger alpha creation mlt_properties_set( mlt_frame_properties( shape_frame ), "distort", "true" ); mlt_frame_get_image( shape_frame, &image, &format, ®ion_width, ®ion_height, 0 ); return mlt_frame_get_alpha_mask( shape_frame ); } /** Do it :-). */ static int transition_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable ) { // Error we will return int error = 0; // We will get the 'b frame' from the frame stack mlt_frame b_frame = mlt_frame_pop_frame( frame ); // Get the watermark transition object mlt_transition this = mlt_frame_pop_service( frame ); // Get the properties of the transition mlt_properties properties = mlt_transition_properties( this ); // Get the composite from the transition mlt_transition composite = mlt_properties_get_data( properties, "composite", NULL ); // Look for the first filter mlt_filter filter = mlt_properties_get_data( properties, "_filter_0", NULL ); // Get the unique id of the filter (used to reacquire the producer position) char *name = mlt_properties_get( properties, "_unique_id" ); // Get the original producer position mlt_position position = mlt_properties_get_position( mlt_frame_properties( frame ), name ); // Create a composite if we don't have one if ( composite == NULL ) { // Create composite via the factory composite = mlt_factory_transition( "composite", NULL ); // If we have one if ( composite != NULL ) { // Get the properties mlt_properties composite_properties = mlt_transition_properties( composite ); // We want to ensure that we don't get a wobble... mlt_properties_set( composite_properties, "distort", "true" ); mlt_properties_set( composite_properties, "progressive", "1" ); // Pass all the composite. properties on the transition down mlt_properties_pass( composite_properties, properties, "composite." ); // Register the composite for reuse/destruction mlt_properties_set_data( properties, "composite", composite, 0, ( mlt_destructor )mlt_transition_close, NULL ); } } // Create filters if ( filter == NULL ) { // Loop Variable int i = 0; // Number of filters created int count = 0; // Loop for all properties for ( i = 0; i < mlt_properties_count( properties ); i ++ ) { // Get the name of this property char *name = mlt_properties_get_name( properties, i ); // If the name does not contain a . and matches filter if ( strchr( name, '.' ) == NULL && !strncmp( name, "filter", 6 ) ) { // Get the filter constructor char *value = mlt_properties_get_value( properties, i ); // Create an instance if ( create_instance( this, name, value, count ) == 0 ) count ++; } } } // Get the image error = mlt_frame_get_image( frame, image, format, width, height, 1 ); // Only continue if we have both filter and composite if ( composite != NULL ) { // Get the resource of this filter (could be a shape [rectangle/circle] or an alpha provider of choice char *resource = mlt_properties_get( properties, "resource" ); // String to hold the filter to query on char id[ 256 ]; // Index to hold the count int i = 0; // We will get the 'b frame' from the composite only if it's NULL if ( b_frame == NULL ) { // Copy the region b_frame = composite_copy_region( composite, frame, position ); // Ensure a destructor mlt_properties_set_data( mlt_frame_properties( frame ), name, b_frame, 0, ( mlt_destructor )mlt_frame_close, NULL ); } // Make sure the filter is in the correct position while ( filter != NULL ) { // Stack this filter mlt_filter_process( filter, b_frame ); // Generate the key for the next sprintf( id, "_filter_%d", ++ i ); // Get the next filter filter = mlt_properties_get_data( properties, id, NULL ); } // Hmm - this is probably going to go wrong.... mlt_frame_set_position( frame, position ); // Get the b frame and process with composite if successful mlt_transition_process( composite, frame, b_frame ); // If we have a shape producer copy the alpha mask from the shape frame to the b_frame if ( strcmp( resource, "rectangle" ) != 0 ) { // Get the producer from the transition mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL ); // If We have no producer then create one if ( producer == NULL ) { // Get the factory producer service char *factory = mlt_properties_get( properties, "factory" ); // Special case circle resource if ( strcmp( resource, "circle" ) == 0 ) { // Special case to ensure that fezzik produces a pixbuf with a NULL constructor resource = "pixbuf"; // Specify the svg circle mlt_properties_set( properties, "producer.resource", "" ); } // Create the producer producer = mlt_factory_producer( factory, resource ); // If we have one if ( producer != NULL ) { // Get the producer properties mlt_properties producer_properties = mlt_producer_properties( producer ); // Ensure that we loop mlt_properties_set( producer_properties, "eof", "loop" ); // Now pass all producer. properties on the transition down mlt_properties_pass( producer_properties, properties, "producer." ); // Register the producer for reuse/destruction mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL ); } } // Now use the shape producer if ( producer != NULL ) { // We will get the alpha frame from the producer mlt_frame shape_frame = NULL; // Make sure the producer is in the correct position mlt_producer_seek( producer, position ); // Get the shape frame if ( mlt_service_get_frame( mlt_producer_service( producer ), &shape_frame, 0 ) == 0 ) { // Ensure that the shape frame will be closed mlt_properties_set_data( mlt_frame_properties( b_frame ), "shape_frame", shape_frame, 0, ( mlt_destructor )mlt_frame_close, NULL ); // Specify the callback for evaluation b_frame->get_alpha_mask = filter_get_alpha_mask; } } } // Get the image error = mlt_frame_get_image( frame, image, format, width, height, 0 ); } return error; } /** Filter processing. */ static mlt_frame transition_process( mlt_transition this, mlt_frame a_frame, mlt_frame b_frame ) { // Get the properties of the frame mlt_properties properties = mlt_frame_properties( a_frame ); // Get a unique name to store the frame position char *name = mlt_properties_get( mlt_transition_properties( this ), "_unique_id" ); // Assign the current position to the name mlt_properties_set_position( properties, name, mlt_frame_get_position( a_frame ) ); // Push the transition on to the frame mlt_frame_push_service( a_frame, this ); // Push the b_frame on to the stack mlt_frame_push_frame( a_frame, b_frame ); // Push the transition method mlt_frame_push_get_image( a_frame, transition_get_image ); // Return the frame return a_frame; } /** Constructor for the transition. */ mlt_transition transition_region_init( void *arg ) { // Create a new transition mlt_transition this = mlt_transition_new( ); // Further initialisation if ( this != NULL ) { // Get the properties from the transition mlt_properties properties = mlt_transition_properties( this ); // Assign the transition process method this->process = transition_process; // Default factory mlt_properties_set( properties, "factory", "fezzik" ); // Resource defines the shape of the region mlt_properties_set( properties, "resource", arg == NULL ? "rectangle" : arg ); } // Return the transition return this; }