Function ParseVideoFrameCopyToOptions

src/video_frame.ts:503–539

(
	frame: VideoFramePolyfill,
	options: VideoFrameCopyToOptions,
)

};

const ParseVideoFrameCopyToOptions = (
	frame: VideoFramePolyfill,
	options: VideoFrameCopyToOptions,
): CombinedBufferLayout => {
	// 1. Let defaultRect be the result of performing the getter steps for visibleRect.
	const defaultRect = frame.visibleRect!;

	// 2. Let overrideRect be undefined.
	// 3. If options.rect exists, assign the value of options.rect to overrideRect.
	const overrideRect = options.rect;

	// 4. Let parsedRect be the result of running the Parse Visible Rect algorithm...
	const parsedRect = ParseVisibleRect(defaultRect, overrideRect, frame.codedWidth, frame.codedHeight, frame.format);

	// 5. If parsedRect is an exception, return parsedRect. (Handled by throw)

	// 6. Let optLayout be undefined.
	// 7. If options.layout exists, assign its value to optLayout.
	const optLayout = options.layout;

	// 8. Let format be undefined.
	let format: VideoPixelFormat | undefined;

	// 9. If options.format does not exist, assign [[format]] to format.
	if (!options.format) {
		format = frame.format!;
	} else if (['RGBA', 'RGBX', 'BGRA', 'BGRX'].includes(options.format)) {
		// 10. Otherwise, if options.format is equal to one of RGBA, RGBX, BGRA, BGRX, then assign options.format
		//  to format...
		format = options.format;
	} else {
		throw new Error('NotSupportedError: Invalid destination format');
	}

	// 11. Let combinedLayout be the result of running the Compute Layout and Allocation Size algorithm...
	return ComputeLayoutAndAllocationSize(parsedRect, format, optLayout);
};

const ConvertToRGBFrame = async (
	frame: VideoFramePolyfill,