[melted] / src / modules / sdl / consumer_sdl_preview.c

/*
 * consumer_sdl_preview.c -- A Simple DirectMedia Layer consumer
 * Copyright (C) 2004-2005 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 "consumer_sdl.h"
#include <framework/mlt_frame.h>
#include <framework/mlt_factory.h>
#include <framework/mlt_producer.h>
#include <stdlib.h>
#include <pthread.h>
#include <SDL/SDL.h>
#include <SDL/SDL_syswm.h>

typedef struct consumer_sdl_s *consumer_sdl;

struct consumer_sdl_s
{
        struct mlt_consumer_s parent;
        mlt_consumer active;
        int ignore_change;
        mlt_consumer play;
        mlt_consumer still;
        pthread_t thread;
        int joined;
        int running;
        int sdl_flags;
        double last_speed;
};

/** Forward references to static functions.
*/

static int consumer_start( mlt_consumer parent );
static int consumer_stop( mlt_consumer parent );
static int consumer_is_stopped( mlt_consumer parent );
static void consumer_close( mlt_consumer parent );
static void *consumer_thread( void * );
static void consumer_frame_show_cb( mlt_consumer sdl, mlt_consumer this, mlt_frame frame );
static void consumer_sdl_event_cb( mlt_consumer sdl, mlt_consumer this, SDL_Event *event );

mlt_consumer consumer_sdl_preview_init( char *arg )
{
        consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
        if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
        {
                // Get the parent consumer object
                mlt_consumer parent = &this->parent;

                // Get the properties
                mlt_properties properties = mlt_consumer_properties( parent );

                // Get the width and height
                int width = mlt_properties_get_int( properties, "width" );
                int height = mlt_properties_get_int( properties, "height" );

                // Process actual param
                if ( arg == NULL || sscanf( arg, "%dx%d", &width, &height ) == 2 )
                {
                        mlt_properties_set_int( properties, "width", width );
                        mlt_properties_set_int( properties, "height", height );
                }

                // Create child consumers
                this->play = mlt_factory_consumer( "sdl", arg );
                this->still = mlt_factory_consumer( "sdl_still", arg );
                mlt_properties_set( mlt_consumer_properties( parent ), "real_time", "0" );
                parent->close = consumer_close;
                parent->start = consumer_start;
                parent->stop = consumer_stop;
                parent->is_stopped = consumer_is_stopped;
                this->joined = 1;
                mlt_events_listen( mlt_consumer_properties( this->play ), this, "consumer-frame-show", ( mlt_listener )consumer_frame_show_cb );
                mlt_events_listen( mlt_consumer_properties( this->still ), this, "consumer-frame-show", ( mlt_listener )consumer_frame_show_cb );
                mlt_events_listen( mlt_consumer_properties( this->play ), this, "consumer-sdl-event", ( mlt_listener )consumer_sdl_event_cb );
                mlt_events_listen( mlt_consumer_properties( this->still ), this, "consumer-sdl-event", ( mlt_listener )consumer_sdl_event_cb );
                return parent;
        }
        free( this );
        return NULL;
}

void consumer_frame_show_cb( mlt_consumer sdl, mlt_consumer parent, mlt_frame frame )
{
        consumer_sdl this = parent->child;
        this->last_speed = mlt_properties_get_double( mlt_frame_properties( frame ), "_speed" );
        mlt_events_fire( mlt_consumer_properties( parent ), "consumer-frame-show", frame, NULL );
}

static void consumer_sdl_event_cb( mlt_consumer sdl, mlt_consumer parent, SDL_Event *event )
{
        mlt_events_fire( mlt_consumer_properties( parent ), "consumer-sdl-event", event, NULL );
}

static int consumer_start( mlt_consumer parent )
{
        consumer_sdl this = parent->child;

        if ( !this->running )
        {
                pthread_attr_t thread_attributes;
                
                consumer_stop( parent );

                this->running = 1;
                this->joined = 0;
                this->last_speed = 1;

                // Inherit the scheduling priority
                pthread_attr_init( &thread_attributes );
                pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );

                pthread_create( &this->thread, &thread_attributes, consumer_thread, this );
        }

        return 0;
}

static int consumer_stop( mlt_consumer parent )
{
        // Get the actual object
        consumer_sdl this = parent->child;

        if ( this->joined == 0 )
        {
                // Kill the thread and clean up
                this->running = 0;

                pthread_join( this->thread, NULL );
                this->joined = 1;
        }

        return 0;
}

static int consumer_is_stopped( mlt_consumer parent )
{
        consumer_sdl this = parent->child;
        return !this->running;
}

static void *consumer_thread( void *arg )
{
        // Identify the arg
        consumer_sdl this = arg;

        // Get the consumer
        mlt_consumer consumer = &this->parent;

        // internal intialization
        int first = 1;
        mlt_frame frame = NULL;

        // properties
        mlt_properties properties = mlt_consumer_properties( consumer );
        mlt_properties play = mlt_consumer_properties( this->play );
        mlt_properties still = mlt_consumer_properties( this->still );

        if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE ) < 0 )
        {
                fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
                return NULL;
        }

        SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
        SDL_EnableUNICODE( 1 );

        // Inform child consumers that we control the sdl
        mlt_properties_set_int( play, "sdl_started", 1 );
        mlt_properties_set_int( still, "sdl_started", 1 );

        // Pass properties down
        mlt_properties_set_data( play, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
        mlt_properties_set_data( still, "transport_producer", mlt_properties_get_data( properties, "transport_producer", NULL ), 0, NULL, NULL );
        mlt_properties_set_data( play, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
        mlt_properties_set_data( still, "transport_callback", mlt_properties_get_data( properties, "transport_callback", NULL ), 0, NULL, NULL );
        mlt_properties_set( play, "rescale", mlt_properties_get( properties, "rescale" ) );
        mlt_properties_set( still, "rescale", mlt_properties_get( properties, "rescale" ) );
        mlt_properties_set( play, "width", mlt_properties_get( properties, "width" ) );
        mlt_properties_set( still, "width", mlt_properties_get( properties, "width" ) );
        mlt_properties_set( play, "height", mlt_properties_get( properties, "height" ) );
        mlt_properties_set( still, "height", mlt_properties_get( properties, "height" ) );

        mlt_properties_pass( play, mlt_consumer_properties( consumer ), "play." );
        mlt_properties_pass( still, mlt_consumer_properties( consumer ), "still." );

        mlt_properties_set_data( play, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
        mlt_properties_set_data( still, "app_lock", mlt_properties_get_data( properties, "app_lock", NULL ), 0, NULL, NULL );
        mlt_properties_set_data( play, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );
        mlt_properties_set_data( still, "app_unlock", mlt_properties_get_data( properties, "app_unlock", NULL ), 0, NULL, NULL );

        mlt_properties_set_int( play, "put_mode", 1 );
        mlt_properties_set_int( still, "put_mode", 1 );

        // Loop until told not to
        while( this->running )
        {
                // Get a frame from the attached producer
                frame = mlt_consumer_get_frame( consumer );

                // Ensure that we have a frame
                if ( frame != NULL )
                {
                        // Get the speed of the frame
                        double speed = mlt_properties_get_double( mlt_frame_properties( frame ), "_speed" );

                        // Determine which speed to use
                        double use_speed = first ? speed : this->last_speed;

                        // Get changed requests to the preview (focus changes)
                        int changed = mlt_properties_get_int( properties, "changed" );

                        // Get refresh request for the current frame (effect changes in still mode)
                        int refresh = mlt_properties_get_int( properties, "refresh" );

                        // Decrement refresh and clear changed
                        mlt_properties_set_int( properties, "refresh", refresh > 0 ? refresh - 1 : 0 );
                        mlt_properties_set_int( properties, "changed", 0 );

                        // Set the changed property on this frame for the benefit of still
                        mlt_properties_set_int( mlt_frame_properties( frame ), "refresh", refresh );

                        // Make sure the recipient knows that this frame isn't really rendered
                        mlt_properties_set_int( mlt_frame_properties( frame ), "rendered", 0 );

                        // If we're not the first frame and both consumers are stopped, then stop ourselves
                        if ( !first && mlt_consumer_is_stopped( this->play ) && mlt_consumer_is_stopped( this->still ) )
                        {
                                this->running = 0;
                                mlt_frame_close( frame );
                        }
                        // Allow a little grace time before switching consumers on speed changes
                        else if ( this->ignore_change -- > 0 && this->active != NULL && !mlt_consumer_is_stopped( this->active ) )
                        {
                                mlt_consumer_put_frame( this->active, frame );
                                mlt_properties_set_int( still, "changed", changed );
                        }
                        // If we aren't playing normally, then use the still
                        else if ( use_speed != 1 )
                        {
                                if ( !mlt_consumer_is_stopped( this->play ) )
                                        mlt_consumer_stop( this->play );
                                if ( mlt_consumer_is_stopped( this->still ) )
                                {
                                        this->last_speed = use_speed;
                                        this->active = this->still;
                                        this->ignore_change = 5;
                                        mlt_consumer_start( this->still );
                                }
                                mlt_properties_set_int( still, "changed", changed );
                                mlt_consumer_put_frame( this->still, frame );
                        }
                        // Otherwise use the normal player
                        else
                        {
                                if ( !mlt_consumer_is_stopped( this->still ) )
                                        mlt_consumer_stop( this->still );
                                if ( mlt_consumer_is_stopped( this->play ) )
                                {
                                        this->last_speed = use_speed;
                                        this->active = this->play;
                                        this->ignore_change = 25;
                                        mlt_consumer_start( this->play );
                                }
                                mlt_properties_set_int( still, "changed", changed );
                                mlt_consumer_put_frame( this->play, frame );
                        }

                        // Copy the rectangle info from the active consumer
                        if ( this->running )
                        {
                                mlt_properties active = mlt_consumer_properties( this->active );
                                mlt_properties_set_int( properties, "rect_x", mlt_properties_get_int( active, "rect_x" ) );
                                mlt_properties_set_int( properties, "rect_y", mlt_properties_get_int( active, "rect_y" ) );
                                mlt_properties_set_int( properties, "rect_w", mlt_properties_get_int( active, "rect_w" ) );
                                mlt_properties_set_int( properties, "rect_h", mlt_properties_get_int( active, "rect_h" ) );
                        }

                        // We are definitely not waiting on the first frame any more
                        first = 0;
                }
        }

        mlt_consumer_stop( this->play );
        mlt_consumer_stop( this->still );

        SDL_Quit( );

        return NULL;
}

/** Callback to allow override of the close method.
*/

static void consumer_close( mlt_consumer parent )
{
        // Get the actual object
        consumer_sdl this = parent->child;

        // Stop the consumer
        mlt_consumer_stop( parent );

        // Now clean up the rest
        mlt_consumer_close( parent );

        // Close the child consumers
        mlt_consumer_close( this->play );
        mlt_consumer_close( this->still );

        // Finally clean up this
        free( this );
}