C++ MLT_PRODUCER_PROPERTIES函数代码示例

mlt_producer producer_consumer_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
{
	mlt_producer self = mlt_producer_new( profile );

	// Encapsulate the real producer
	mlt_profile temp_profile = mlt_profile_clone( profile );
	temp_profile->is_explicit = 0;
	mlt_producer real_producer = mlt_factory_producer( temp_profile, NULL, arg );

	if ( self && real_producer )
	{
		// Override some producer methods
		self->close = ( mlt_destructor )producer_close;
		self->get_frame = get_frame;
		
		// Get the properties of this producer
		mlt_properties properties = MLT_PRODUCER_PROPERTIES( self );
		mlt_properties_set( properties, "resource", arg );
		mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( real_producer ), "out, length" );

		// Done with the producer - will re-open later when we have the profile property
		mlt_producer_close( real_producer );
	}
	else
	{
		if ( self )
			mlt_producer_close( self );
		if ( real_producer )
			mlt_producer_close( real_producer );

		self = NULL;
	}
	mlt_profile_close( temp_profile );
	return self;
}

int mlt_producer_set_in_and_out( mlt_producer self, mlt_position in, mlt_position out )
{
	mlt_properties properties = MLT_PRODUCER_PROPERTIES( self );

	// Correct ins and outs if necessary
	if ( in < 0 )
		in = 0;
	else if ( in >= mlt_producer_get_length( self ) )
		in = mlt_producer_get_length( self ) - 1;

	if ( ( out < 0 || out >= mlt_producer_get_length( self ) ) && !mlt_producer_is_blank( self ) )
		out = mlt_producer_get_length( self ) - 1;
	else if ( ( out < 0 || out >= mlt_producer_get_length( self ) ) && mlt_producer_is_blank( self ) )
		mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( self ), "length", out + 1 );
	else if ( out < 0 )
		out = 0;

	// Swap ins and outs if wrong
	if ( out < in )
	{
		mlt_position t = in;
		in = out;
		out = t;
	}

	// Set the values
	mlt_events_block( properties, properties );
	mlt_properties_set_position( properties, "in", in );
	mlt_events_unblock( properties, properties );
	mlt_properties_set_position( properties, "out", out );

	return 0;
}

void mlt_producer_close( mlt_producer self )
{
	if ( self != NULL && mlt_properties_dec_ref( MLT_PRODUCER_PROPERTIES( self ) ) <= 0 )
	{
		self->parent.close = NULL;

		if ( self->close != NULL )
		{
			self->close( self->close_object );
		}
		else
		{
			int destroy = mlt_producer_is_cut( self );

#if _MLT_PRODUCER_CHECKS_ == 1
			// Show debug info
			mlt_properties_debug( MLT_PRODUCER_PROPERTIES( self ), "Producer closing", stderr );
#endif

#ifdef _MLT_PRODUCER_CHECKS_
			// Show current stats - these should match when the app is closed
			mlt_log( MLT_PRODUCER_SERVICE( self ), MLT_LOG_DEBUG, "Producers created %d, destroyed %d\n", producers_created, ++producers_destroyed );
#endif

			mlt_service_close( &self->parent );

			if ( destroy )
				free( self );
		}
	}
}

mlt_producer mlt_producer_cut( mlt_producer self, int in, int out )
{
	mlt_producer result = mlt_producer_new( mlt_service_profile( MLT_PRODUCER_SERVICE( self ) ) );
	mlt_producer parent = mlt_producer_cut_parent( self );
	mlt_properties properties = MLT_PRODUCER_PROPERTIES( result );
	mlt_properties parent_props = MLT_PRODUCER_PROPERTIES( parent );

	mlt_properties_set_lcnumeric( properties,
		mlt_properties_get_lcnumeric( MLT_PRODUCER_PROPERTIES( self ) ) );

	mlt_events_block( MLT_PRODUCER_PROPERTIES( result ), MLT_PRODUCER_PROPERTIES( result ) );
	// Special case - allow for a cut of the entire producer (this will squeeze all other cuts to 0)
	if ( in <= 0 )
		in = 0;
	if ( ( out < 0 || out >= mlt_producer_get_length( parent ) ) && !mlt_producer_is_blank( self ) )
		out = mlt_producer_get_length( parent ) - 1;

	mlt_properties_inc_ref( parent_props );
	mlt_properties_set_int( properties, "_cut", 1 );
	mlt_properties_set_data( properties, "_cut_parent", parent, 0, ( mlt_destructor )mlt_producer_close, NULL );
	mlt_properties_set_position( properties, "length", mlt_properties_get_position( parent_props, "length" ) );
	mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( parent_props, "aspect_ratio" ) );
	mlt_producer_set_in_and_out( result, in, out );

	return result;
}

int mlt_producer_seek( mlt_producer self, mlt_position position )
{
	// Determine eof handling
	mlt_properties properties = MLT_PRODUCER_PROPERTIES( self );
	char *eof = mlt_properties_get( properties, "eof" );
	int use_points = 1 - mlt_properties_get_int( properties, "ignore_points" );

	// Recursive behaviour for cuts - repositions parent and then repositions cut
	// hence no return on this condition
	if ( mlt_producer_is_cut( self ) )
		mlt_producer_seek( mlt_producer_cut_parent( self ), position + mlt_producer_get_in( self ) );

	// Check bounds
	if ( position < 0 || mlt_producer_get_playtime( self ) == 0 )
	{
		position = 0;
	}
	else if ( use_points && ( eof == NULL || !strcmp( eof, "pause" ) ) && position >= mlt_producer_get_playtime( self ) )
	{
		mlt_producer_set_speed( self, 0 );
		position = mlt_producer_get_playtime( self ) - 1;
	}
	else if ( use_points && eof && !strcmp( eof, "loop" ) && position >= mlt_producer_get_playtime( self ) )
	{
		position = (int)position % (int)mlt_producer_get_playtime( self );
	}

	// Set the position
	mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( self ), "_position", position );

	// Calculate the absolute frame
	mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( self ), "_frame", use_points * mlt_producer_get_in( self ) + position );

	return 0;
}

static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index )
{
	// Get the mutiltrack object
	mlt_multitrack self = parent->child;

	// Check if we have a track for this index
	if ( index >= 0 && index < self->count && self->list[ index ] != NULL )
	{
		// Get the producer for this track
		mlt_producer producer = self->list[ index ]->producer;

		// Get the track hide property
		int hide = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( mlt_producer_cut_parent( producer ) ), "hide" );

		// Obtain the current position
		mlt_position position = mlt_producer_frame( parent );

		// Get the parent properties
		mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( parent );

		// Get the speed
		double speed = mlt_properties_get_double( producer_properties, "_speed" );

		// Make sure we're at the same point
		mlt_producer_seek( producer, position );

		// Get the frame from the producer
		mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), frame, 0 );

		// Indicate speed of this producer
		mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
		mlt_properties_set_double( properties, "_speed", speed );
		mlt_frame_set_position( *frame, position );
		mlt_properties_set_int( properties, "hide", hide );
	}
	else
	{
		// Generate a test frame
		*frame = mlt_frame_init( MLT_PRODUCER_SERVICE( parent ) );

		// Update position on the frame we're creating
		mlt_frame_set_position( *frame, mlt_producer_position( parent ) );

		// Move on to the next frame
		if ( index >= self->count )
		{
			// Let tractor know if we've reached the end
			mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "last_track", 1 );

			// Move to the next frame
			mlt_producer_prepare_next( parent );
		}
	}

	return 0;
}

int mlt_multitrack_insert( mlt_multitrack self, mlt_producer producer, int track )
{
	if ( track >= self->count )
		return mlt_multitrack_connect( self, producer, track );

	// Connect to the producer to ourselves at the specified track
	int result = mlt_service_insert_producer( MLT_MULTITRACK_SERVICE( self ), MLT_PRODUCER_SERVICE( producer ), track );

	if ( result == 0 )
	{
		// Resize the producer list if needed.
		if ( self->count + 1 > self->size )
		{
			int new_size = self->size + 10;
			self->list = realloc( self->list, new_size * sizeof( mlt_track ) );
			if ( self->list )
			{
				memset( &self->list[ self->size ], 0, new_size - self->size );
				self->size = new_size;
			}
		}

		if ( self->list )
		{
			// Move all of the list elements following track N down by 1.
			memmove( &self->list[ track + 1 ], &self->list[ track ],
					( self->count - track ) * sizeof ( mlt_track ) );
			self->count ++;

			// Assign the track in our list.
			self->list[ track ] = malloc( sizeof( struct mlt_track_s ) );
			self->list[ track ]->producer = producer;
			self->list[ track ]->event = mlt_events_listen( MLT_PRODUCER_PROPERTIES( producer ), self,
										 "producer-changed", ( mlt_listener )mlt_multitrack_listener );
			mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
			mlt_event_inc_ref( self->list[ track ]->event );

			// TODO: Move this into producer_avformat.c when mlt_events broadcasting is available.
			if ( self->count > mlt_service_cache_get_size( MLT_MULTITRACK_SERVICE( self ), "producer_avformat" ) )
				mlt_service_cache_set_size( MLT_MULTITRACK_SERVICE( self ), "producer_avformat", self->count + 1 );

			// Refresh our stats
			mlt_multitrack_refresh( self );
		}
		else
		{
			result = -1;
		}
	}

	return result;
}

mlt_producer mlt_producer_new( mlt_profile profile )
{
	mlt_producer self = malloc( sizeof( struct mlt_producer_s ) );
	if ( self )
	{
		if ( mlt_producer_init( self, NULL ) == 0 )
		{
			mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( self ), "_profile", profile, 0, NULL, NULL );
			mlt_properties_set_double( MLT_PRODUCER_PROPERTIES( self ), "aspect_ratio", mlt_profile_sar( profile ) );
		}
	}
	return self;
}

int mlt_multitrack_connect( mlt_multitrack self, mlt_producer producer, int track )
{
	// Connect to the producer to ourselves at the specified track
	int result = mlt_service_connect_producer( MLT_MULTITRACK_SERVICE( self ), MLT_PRODUCER_SERVICE( producer ), track );

	if ( result == 0 )
	{
		mlt_track current_track = ( track < self->count )? self->list[ track ] : NULL;
		// Resize the producer list if need be
		if ( track >= self->size )
		{
			int i;
			self->list = realloc( self->list, ( track + 10 ) * sizeof( mlt_track ) );
			for ( i = self->size; i < track + 10; i ++ )
				self->list[ i ] = NULL;
			self->size = track + 10;
		}

		if ( current_track )
		{
			mlt_event_close( current_track->event );
			mlt_producer_close( current_track->producer );
		}
		else
		{
			self->list[ track ] = malloc( sizeof( struct mlt_track_s ) );
		}

		// Assign the track in our list here
		self->list[ track ]->producer = producer;
		self->list[ track ]->event = mlt_events_listen( MLT_PRODUCER_PROPERTIES( producer ), self,
									 "producer-changed", ( mlt_listener )mlt_multitrack_listener );
		mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
		mlt_event_inc_ref( self->list[ track ]->event );

		// Increment the track count if need be
		if ( track >= self->count )
		{
			self->count = track + 1;

			// TODO: Move this into producer_avformat.c when mlt_events broadcasting is available.
			if ( self->count > mlt_service_cache_get_size( MLT_MULTITRACK_SERVICE( self ), "producer_avformat" ) )
				mlt_service_cache_set_size( MLT_MULTITRACK_SERVICE( self ), "producer_avformat", self->count + 1 );
		}

		// Refresh our stats
		mlt_multitrack_refresh( self );
	}

	return result;
}

static void add_clock_to_frame( mlt_producer producer, mlt_frame frame, time_info* info )
{
	mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( producer ) );
	mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
	uint8_t* image = NULL;
	mlt_image_format format = mlt_image_rgb24a;
	int size = 0;
	int width = profile->width;
	int height = profile->height;
	int line_width = LINE_WIDTH_RATIO * (width > height ? height : width) / 100;
	int radius = (width > height ? height : width) / 2;
	char* direction = mlt_properties_get( producer_properties, "direction" );
	int clock_angle = 0;

	mlt_frame_get_image( frame, &image, &format, &width, &height, 1 );

	// Calculate the angle for the clock.
	int frames = info->frames;
	if( !strcmp( direction, "down" ) )
	{
		frames = info->fps - info->frames - 1;
	}
	clock_angle = (frames + 1) * 360 / info->fps;

	draw_clock( image, profile, clock_angle, line_width );
	draw_cross( image, profile, line_width );
	draw_ring( image, profile, ( radius * OUTER_RING_RATIO ) / 100, line_width );
	draw_ring( image, profile, ( radius * INNER_RING_RATIO ) / 100, line_width );

	size = mlt_image_format_size( format, width, height, NULL );
	mlt_frame_set_image( frame, image, size, mlt_pool_release );
}

mlt_tractor mlt_tractor_new( )
{
	mlt_tractor self = calloc( 1, sizeof( struct mlt_tractor_s ) );
	if ( self != NULL )
	{
		mlt_producer producer = &self->parent;
		if ( mlt_producer_init( producer, self ) == 0 )
		{
			mlt_multitrack multitrack = mlt_multitrack_init( );
			mlt_field field = mlt_field_new( multitrack, self );
			mlt_properties props = MLT_PRODUCER_PROPERTIES( producer );

			mlt_properties_set( props, "resource", "<tractor>" );
			mlt_properties_set( props, "mlt_type", "mlt_producer" );
			mlt_properties_set( props, "mlt_service", "tractor" );
			mlt_properties_set_position( props, "in", 0 );
			mlt_properties_set_position( props, "out", 0 );
			mlt_properties_set_position( props, "length", 0 );
			mlt_properties_set_data( props, "multitrack", multitrack, 0, ( mlt_destructor )mlt_multitrack_close, NULL );
			mlt_properties_set_data( props, "field", field, 0, ( mlt_destructor )mlt_field_close, NULL );

			mlt_events_listen( MLT_MULTITRACK_PROPERTIES( multitrack ), self, "producer-changed", ( mlt_listener )mlt_tractor_listener );

			producer->get_frame = producer_get_frame;
			producer->close = ( mlt_destructor )mlt_tractor_close;
			producer->close_object = self;
		}
		else
		{
			free( self );
			self = NULL;
		}
	}
	return self;
}

static void get_time_info( mlt_producer producer, mlt_frame frame, time_info* info )
{
	mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
	mlt_position position = mlt_frame_original_position( frame );

	info->fps = ceil( mlt_producer_get_fps( producer ) );

	char* direction = mlt_properties_get( producer_properties, "direction" );
	if( !strcmp( direction, "down" ) )
	{
		mlt_position length = mlt_properties_get_int( producer_properties, "length" );
		info->position = length - 1 - position;
	}
	else
	{
		info->position = position;
	}

	char* tc_str = NULL;
	if( mlt_properties_get_int( producer_properties, "drop" ) )
	{
		tc_str = mlt_properties_frames_to_time( producer_properties, info->position, mlt_time_smpte_df );
	}
	else
	{
		tc_str = mlt_properties_frames_to_time( producer_properties, info->position, mlt_time_smpte_ndf );
	}
	sscanf( tc_str, "%02d:%02d:%02d%c%d", &info->hours, &info->minutes, &info->seconds, &info->sep, &info->frames );
}

static void add_text_to_bg( mlt_producer producer, mlt_frame bg_frame, mlt_frame text_frame )
{
	mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
	mlt_transition transition = mlt_properties_get_data( producer_properties, "_transition", NULL );

	if( !transition )
	{
		mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( producer ) );
		transition = mlt_factory_transition( profile, "composite", NULL );

		// Save the transition for future use.
		mlt_properties_set_data( producer_properties, "_transition", transition, 0, ( mlt_destructor )mlt_transition_close, NULL );

		// Configure the transition.
		mlt_properties transition_properties = MLT_TRANSITION_PROPERTIES( transition );
		mlt_properties_set( transition_properties, "geometry", "0%/0%:100%x100%:100" );
		mlt_properties_set( transition_properties, "halign", "center" );
		mlt_properties_set( transition_properties, "valign", "middle" );
	}

	if( transition && bg_frame && text_frame )
	{
		// Apply the transition.
		mlt_transition_process( transition, bg_frame, text_frame );
	}
}

int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
{
	// Generate a frame
	*frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );

	if ( *frame != NULL )
	{
		// Obtain properties of frame and producer
		mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );

		// Obtain properties of producer
		mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );

		// Set the producer on the frame properties
		mlt_properties_set_data( properties, "producer_frei0r", producer, 0, NULL, NULL );

		// Update timecode on the frame we're creating
		mlt_frame_set_position( *frame, mlt_producer_position( producer ) );

		// Set producer-specific frame properties
		mlt_properties_set_int( properties, "progressive", 1 );
		mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( producer ) );
		mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile ) );

		// Push the get_image method
		mlt_frame_push_get_image( *frame, producer_get_image );
	}

	// Calculate the next timecode
	mlt_producer_prepare_next( producer );

	return 0;
}

static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
{
	
	// Obtain properties of frame
	mlt_properties properties = MLT_FRAME_PROPERTIES( frame );

	// Obtain the producer for this frame
	mlt_producer producer = mlt_properties_get_data( properties, "producer_frei0r", NULL );

	// Obtain properties of producer
	mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );

	// Allocate the image
	int size = *width * ( *height + 1 ) * 2;

	// Allocate the image
	*buffer = mlt_pool_alloc( size );

	// Update the frame
	mlt_properties_set_data( properties, "image", *buffer, size, mlt_pool_release, NULL );
	mlt_properties_set_int( properties, "width", *width );
	mlt_properties_set_int( properties, "height", *height );

	*format = mlt_image_yuv422;
	if ( *buffer != NULL )
	{
		mlt_position in = mlt_producer_get_in( producer );
		mlt_position out = mlt_producer_get_out( producer );
		mlt_position time = mlt_frame_get_position( frame );
		double position = ( double )( time - in ) / ( double )( out - in + 1 );
		process_frei0r_item( producer_type , position, producer_props, frame , buffer, format , width , height , writable );
	}

    return 0;
}