C++ MLT_PRODUCER_SERVICE函数代码示例

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_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
{
	// Generate a frame
	*frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
	mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( producer ) );

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

		// Update time code on the frame
		mlt_frame_set_position( *frame, mlt_producer_frame( producer ) );

		mlt_properties_set_int( frame_properties, "progressive", 1 );
		mlt_properties_set_double( frame_properties, "aspect_ratio", mlt_profile_sar( profile ) );
		mlt_properties_set_int( frame_properties, "meta.media.width", profile->width );
		mlt_properties_set_int( frame_properties, "meta.media.height", profile->height );

		// Configure callbacks
		mlt_frame_push_service( *frame, producer );
		mlt_frame_push_get_image( *frame, producer_get_image );
		mlt_frame_push_audio( *frame, producer );
		mlt_frame_push_audio( *frame, producer_get_audio );
	}

	// Calculate the next time code
	mlt_producer_prepare_next( producer );

	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;
}

void mlt_profile_from_producer( mlt_profile profile, mlt_producer producer )
{
	mlt_frame fr = NULL;
	uint8_t *buffer = NULL;
	mlt_image_format fmt = mlt_image_none;
	mlt_properties p;
	int w = profile->width;
	int h = profile->height;

	if ( ! mlt_service_get_frame( MLT_PRODUCER_SERVICE(producer), &fr, 0 ) && fr )
	{
		if ( ! mlt_frame_get_image( fr, &buffer, &fmt, &w, &h, 0 ) )
		{
			// Some source properties are not exposed until after the first get_image call.
			mlt_frame_close( fr );
			mlt_service_get_frame( MLT_PRODUCER_SERVICE(producer), &fr, 0 );
			p = MLT_FRAME_PROPERTIES( fr );
//			mlt_properties_dump(p, stderr);
			if ( mlt_properties_get_int( p, "meta.media.frame_rate_den" ) &&
				 mlt_properties_get_int( p, "meta.media.sample_aspect_den" ) )
			{
				profile->width = mlt_properties_get_int( p, "meta.media.width" );
				profile->height = mlt_properties_get_int( p, "meta.media.height" );
				profile->progressive = mlt_properties_get_int( p, "meta.media.progressive" );
				if ( 1000 > mlt_properties_get_double( p, "meta.media.frame_rate_num" )
				          / mlt_properties_get_double( p, "meta.media.frame_rate_den" ) )
				{
					profile->frame_rate_num = mlt_properties_get_int( p, "meta.media.frame_rate_num" );
					profile->frame_rate_den = mlt_properties_get_int( p, "meta.media.frame_rate_den" );
				} else {
					profile->frame_rate_num = 60;
					profile->frame_rate_den = 1;
				}
				// AVCHD is mis-reported as double frame rate.
				if ( profile->progressive == 0 && (
				     profile->frame_rate_num / profile->frame_rate_den == 50 ||
				     profile->frame_rate_num / profile->frame_rate_den == 59 ) )
					profile->frame_rate_num /= 2;
				profile->sample_aspect_num = mlt_properties_get_int( p, "meta.media.sample_aspect_num" );
				profile->sample_aspect_den = mlt_properties_get_int( p, "meta.media.sample_aspect_den" );
				profile->colorspace = mlt_properties_get_int( p, "meta.media.colorspace" );
				profile->display_aspect_num = lrint( (double) profile->sample_aspect_num * profile->width
					/ profile->sample_aspect_den );
				profile->display_aspect_den = profile->height;
				free( profile->description );
				profile->description = strdup( "automatic" );
				profile->is_explicit = 0;
			}
		}
	}
	mlt_frame_close( fr );
	mlt_producer_seek( producer, 0 );
}

static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
{
	// Get the real structure for this producer
	producer_qimage self = producer->child;

	// Fetch the producers properties
	mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );

	if ( self->filenames == NULL && mlt_properties_get( producer_properties, "resource" ) != NULL )
		load_filenames( self, producer_properties );

	// Generate a frame
	*frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );

	if ( *frame != NULL && self->count > 0 )
	{
		// Obtain properties of frame and producer
		mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );

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

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

		// Ensure that we have a way to obtain the position in the get_image
		mlt_properties_set_position( properties, "qimage_position", mlt_producer_position( producer ) );

		// Refresh the image
		self->qimage_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage" );
		self->qimage = mlt_cache_item_data( self->qimage_cache, NULL );
		refresh_qimage( self, *frame );
		mlt_cache_item_close( self->qimage_cache );

		// Set producer-specific frame properties
		mlt_properties_set_int( properties, "progressive", mlt_properties_get_int( producer_properties, "progressive" ) );
		double force_ratio = mlt_properties_get_double( producer_properties, "force_aspect_ratio" );
		if ( force_ratio > 0.0 )
			mlt_properties_set_double( properties, "aspect_ratio", force_ratio );
		else
			mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_properties, "aspect_ratio" ) );

		// 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_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
{
	if ( frame )
	{
		// Construct a new frame
		*frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );

		// Stack the producer and producer's get image
		mlt_frame_push_service_int( *frame, index );
		mlt_frame_push_service( *frame, producer );
		mlt_frame_push_service( *frame, framebuffer_get_image );

		mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
		mlt_properties frame_properties = MLT_FRAME_PROPERTIES(*frame);

		// Get frame from the real producer
		mlt_frame first_frame = mlt_properties_get_data( properties, "first_frame", NULL );

		if ( first_frame == NULL )
		{
		    // Get the frame to cache from the real producer
		    mlt_producer real_producer = mlt_properties_get_data( properties, "producer", NULL );

		    // Seek the producer to the correct place
		    mlt_producer_seek( real_producer, mlt_producer_position( producer ) );

		    // Get the frame
		    mlt_service_get_frame( MLT_PRODUCER_SERVICE( real_producer ), &first_frame, index );
		    // Cache the frame
		    mlt_properties_set_data( properties, "first_frame", first_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
		}

		mlt_properties_inherit( frame_properties, MLT_FRAME_PROPERTIES(first_frame) );
		
		double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
		if ( force_aspect_ratio <= 0.0 ) force_aspect_ratio = mlt_properties_get_double( properties, "aspect_ratio" );
		mlt_properties_set_double( frame_properties, "aspect_ratio", force_aspect_ratio );
                
		// Give the returned frame temporal identity
		mlt_frame_set_position( *frame, mlt_producer_position( producer ) );

		mlt_properties_set_int( frame_properties, "meta.media.width", mlt_properties_get_int( properties, "width" ) );
		mlt_properties_set_int( frame_properties, "meta.media.height", mlt_properties_get_int( properties, "height" ) );
		mlt_properties_pass_list( frame_properties, properties, "width, height" );
	}

	return 0;
}

static int vdpau_get_buffer( AVCodecContext *codec_context, AVFrame *frame )
{
	int error = 0;
	producer_avformat self = codec_context->opaque;
	mlt_log_debug( MLT_PRODUCER_SERVICE(self->parent), "vdpau_get_buffer\n" );
	
	if ( self->vdpau && mlt_deque_count( self->vdpau->deque ) )
	{
		struct vdpau_render_state *render = mlt_deque_pop_front( self->vdpau->deque );
		
		if ( render )
		{
			frame->data[0] = (uint8_t*) render;
			frame->data[1] = (uint8_t*) render;
			frame->data[2] = (uint8_t*) render;
			frame->linesize[0] = 0;
			frame->linesize[1] = 0;
			frame->linesize[2] = 0;
			frame->type = FF_BUFFER_TYPE_USER;
			render->state = FF_VDPAU_STATE_USED_FOR_REFERENCE;
			frame->reordered_opaque = codec_context->reordered_opaque;
			if ( frame->reference )
			{
				self->vdpau->ip_age[0] = self->vdpau->ip_age[1] + 1;
				self->vdpau->ip_age[1] = 1;
				self->vdpau->b_age++;
			}
			else
			{
				self->vdpau->ip_age[0] ++;
				self->vdpau->ip_age[1] ++;
				self->vdpau->b_age = 1;
			}
		}
		else
		{
			mlt_log_warning( MLT_PRODUCER_SERVICE(self->parent), "VDPAU surface underrun\n" );
			error = -1;
		}
	}
	else
	{
		mlt_log_warning( MLT_PRODUCER_SERVICE(self->parent), "VDPAU surface underrun\n" );
		error = -1;
	}
	
	return error;
}

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 */
	producer_ktitle this = mlt_properties_get_data( properties, "producer_kdenlivetitle", NULL );
	
	/* Obtain properties of producer */
	mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( &this->parent );
	
	*width = mlt_properties_get_int( properties, "rescale_width" );
	*height = mlt_properties_get_int( properties, "rescale_height" );
	
	mlt_service_lock( MLT_PRODUCER_SERVICE( &this->parent ) );

	/* Allocate the image */
	*format = mlt_image_rgb24a;
	mlt_position time = mlt_producer_position( &this->parent ) + mlt_producer_get_in( &this->parent );
	if ( mlt_properties_get_int( producer_props, "force_reload" ) ) {
		if (mlt_properties_get_int( producer_props, "force_reload" ) > 1) read_xml(producer_props);
		mlt_properties_set_int( producer_props, "force_reload", 0 );
		drawKdenliveTitle( this, frame, *width, *height, time, 1);
	}
	else drawKdenliveTitle( this, frame, *width, *height, time, 0);

	// Get width and height (may have changed during the refresh)
	*width = mlt_properties_get_int( properties, "width" );
	*height = mlt_properties_get_int( properties, "height" );
		
	if ( this->current_image )
	{
		// Clone the image and the alpha
		int image_size = this->current_width * ( this->current_height ) * 4;
		uint8_t *image_copy = mlt_pool_alloc( image_size );
		memcpy( image_copy, this->current_image, image_size );
		// Now update properties so we free the copy after
		mlt_frame_set_image( frame, image_copy, image_size, mlt_pool_release );
		// We're going to pass the copy on
		*buffer = image_copy;		

		mlt_log_debug( MLT_PRODUCER_SERVICE( &this->parent ), "width:%d height:%d %s\n", *width, *height, mlt_image_format_name( *format ) );
	}

	mlt_service_unlock( MLT_PRODUCER_SERVICE( &this->parent ) );

	return 0;
}

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

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

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

        // Update timecode on the frame we're creating
        mlt_position position = mlt_producer_position(producer);
        mlt_frame_set_position(*frame, position);
        mlt_properties_set_position(properties, kWebVfxPositionPropertyName, position);
        
        // Set producer-specific frame properties
        mlt_properties_set_int(properties, "progressive", 1);

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

    // Calculate the next timecode
    mlt_producer_prepare_next(producer);

    return 0;
}

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 );
	}
}

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

	// Check that we created a frame and initialize it
	if ( *frame != NULL )
	{
		// Obtain properties of frame
		mlt_properties frame_properties = MLT_FRAME_PROPERTIES( *frame );

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

		// Save the producer to be used in get_audio
		mlt_properties_set_data( frame_properties, "_producer_ladspa", producer, 0, NULL, NULL );

		// Push the get_audio method
		mlt_frame_push_audio( *frame, producer_get_audio );
	}

	// Calculate the next time code
	mlt_producer_prepare_next( producer );

	return 0;
}

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;
}

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 );
		}
	}
}

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 );
}

static void producer_close( mlt_producer producer )
{
	producer_ktitle self = producer->child;
	producer->close = NULL;
	mlt_service_cache_purge( MLT_PRODUCER_SERVICE( producer ) );
	mlt_producer_close( producer );
	free( self );
}