[melted] / src / framework / mlt_consumer.c

/*
 * mlt_consumer.c -- abstraction for all consumer services
 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
 * Author: Charles Yates <charles.yates@pandora.be>
 *
 * 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 "config.h"
#include "mlt_consumer.h"
#include "mlt_factory.h"
#include "mlt_producer.h"
#include "mlt_frame.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

/** Public final methods
*/

int mlt_consumer_init( mlt_consumer this, void *child )
{
        int error = 0;
        memset( this, 0, sizeof( struct mlt_consumer_s ) );
        this->child = child;
        error = mlt_service_init( &this->parent, this );
        if ( error == 0 )
        {
                // Get the properties from the service
                mlt_properties properties = mlt_service_properties( &this->parent );

                // Get the normalisation preference
                char *normalisation = getenv( "MLT_NORMALISATION" );

                // Deal with normalisation
                if ( normalisation == NULL || strcmp( normalisation, "NTSC" ) )
                {
                        mlt_properties_set( properties, "normalisation", "PAL" );
                        mlt_properties_set_double( properties, "fps", 25.0 );
                        mlt_properties_set_int( properties, "width", 720 );
                        mlt_properties_set_int( properties, "height", 576 );
                        mlt_properties_set_int( properties, "progressive", 0 );
                }
                else
                {
                        mlt_properties_set( properties, "normalisation", "NTSC" );
                        mlt_properties_set_double( properties, "fps", 30000.0 / 1001.0 );
                        mlt_properties_set_int( properties, "width", 720 );
                        mlt_properties_set_int( properties, "height", 480 );
                        mlt_properties_set_int( properties, "progressive", 0 );
                }
                mlt_properties_set_double( properties, "aspect_ratio", 4.0 / 3.0 );

                // Default rescaler for all consumers
                mlt_properties_set( properties, "rescale", "bilinear" );
        }
        return error;
}

/** Get the parent service object.
*/

mlt_service mlt_consumer_service( mlt_consumer this )
{
        return &this->parent;
}

/** Get the consumer properties.
*/

mlt_properties mlt_consumer_properties( mlt_consumer this )
{
        return mlt_service_properties( &this->parent );
}

/** Connect the consumer to the producer.
*/

int mlt_consumer_connect( mlt_consumer this, mlt_service producer )
{
        return mlt_service_connect_producer( &this->parent, producer, 0 );
}

/** Start the consumer.
*/

int mlt_consumer_start( mlt_consumer this )
{
        // Get the properies
        mlt_properties properties = mlt_consumer_properties( this );

        // Determine if there's a test card producer
        char *test_card = mlt_properties_get( properties, "test_card" );

        // Deal with it now.
        if ( test_card != NULL )
        {
                // Create a test card producer
                // TODO: do we want to use fezzik here?
                mlt_producer producer = mlt_factory_producer( "fezzik", test_card );

                // Do we have a producer
                if ( producer != NULL )
                {
                        // Set the test card on the consumer
                        mlt_properties_set_data( properties, "test_card_producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
                }
        }

        // Start the service
        if ( this->start != NULL )
                return this->start( this );

        return 0;
}

/** Protected method :-/ for consumer to get frames from connected service
*/

mlt_frame mlt_consumer_get_frame( mlt_consumer this )
{
        // Frame to return
        mlt_frame frame = NULL;

        // Get the service assoicated to the consumer
        mlt_service service = mlt_consumer_service( this );

        // Get the frame
        if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
        {
                // Get the consumer properties
                mlt_properties properties = mlt_consumer_properties( this );

                // Get the frame properties
                mlt_properties frame_properties = mlt_frame_properties( frame );

                // Attach the test frame producer to it.
                mlt_producer test_card = mlt_properties_get_data( properties, "test_card_producer", NULL );
                mlt_properties_set_data( frame_properties, "test_card_producer", test_card, 0, NULL, NULL );

                // Attach the rescale property
                if ( mlt_properties_get( properties, "rescale" ) != NULL )
                        mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale" ) );

                // TODO: Aspect ratio and other jiggery pokery
                mlt_properties_set_double( frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "aspect_ratio" ) );
                
        }

        // Return the frame
        return frame;
}

/** Stop the consumer.
*/

int mlt_consumer_stop( mlt_consumer this )
{
        // Get the properies
        mlt_properties properties = mlt_consumer_properties( this );

        // Stop the consumer
        if ( this->stop != NULL )
                return this->stop( this );

        // Kill the test card
        mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );

        return 0;
}

/** Determine if the consumer is stopped.
*/

int mlt_consumer_is_stopped( mlt_consumer this )
{
        // Stop the consumer
        if ( this->is_stopped != NULL )
                return this->is_stopped( this );

        return 0;
}

/** Close the consumer.
*/

void mlt_consumer_close( mlt_consumer this )
{
        // Get the childs close function
        void ( *consumer_close )( ) = this->close;

        // Make sure it only gets called once
        this->close = NULL;

        // Call the childs close if available
        if ( consumer_close != NULL )
                consumer_close( this );
        else
                mlt_service_close( &this->parent );
}