/**
	 * Returns the MIME type for the file, including codecs information.
	 *
	 * @param File $file The file object.
	 * @return string The MIME type including the codecs.
	 */
	public function getWebType( $file ) {
		// Determine the base type (audio or video) based on file dimensions
		$baseType = ( $file->getWidth() === 0 && $file->getHeight() === 0 ) ? 'audio' : 'video';

		// Get the stream types (codecs) from the file metadata
		$streams = $this->getStreamTypes( $file );
		if ( !$streams ) {
			// Return the base type with WebM format if no streams are found
			return $baseType . '/webm';
		}

		// Process codecs: Keep AV1 in original case, convert others to lowercase
		$processedStreams = array_map( function ( $codec ) {
			return stripos( $codec, 'av01.' ) === 0 ? $codec : strtolower( $codec );
		}, $streams );

		// Combine processed streams into a single codec string
		$codecs = implode( ', ', $processedStreams );
		return $baseType . '/webm; codecs="' . $codecs . '"';
	}
	
	/**
	 * Generates a codec string for AV1 based on the metadata.
	 *
	 * @param array $metadata Video metadata.
	 * @return string The codec string for AV1.
	 */
	private function getAV1CodecString( $metadata ) {
		// Default values in case metadata is incomplete
		$profile = '0'; // Default: Main Profile
		$level = '05';  // Default: Level 5.0
		$tier = 'M';    // Default: Main Tier
		$bitDepth = '08'; // Default: 8-bit

		// Check for bit depth
		if ( isset( $metadata['video']['bit_depth'] ) ) {
			if ( $metadata['video']['bit_depth'] === 10 ) {
				$bitDepth = '10'; // 10-bit depth
			} elseif ( $metadata['video']['bit_depth'] === 12 ) {
				$bitDepth = '12'; // 12-bit depth (rare)
			}
		}

		// Analyze resolution and adjust level
		if ( isset( $metadata['video']['resolution_x'] ) && isset( $metadata['video']['resolution_y'] ) ) {
			$width = $metadata['video']['resolution_x'];
			$height = $metadata['video']['resolution_y'];

			// Determine level based on resolution and frame rate
			if ( isset( $metadata['video']['frame_rate'] ) ) {
				$frameRate = $metadata['video']['frame_rate'];
			} else {
				$frameRate = 30; // Assume a default frame rate if not provided
			}

			$pixelsPerSecond = $width * $height * $frameRate;

			// Assign level based on the AV1 specification (simplified mapping)
			if ( $pixelsPerSecond <= 829440 ) { // <= 720p@30fps
				$level = '02';
			} elseif ( $pixelsPerSecond <= 2073600 ) { // <= 1080p@30fps
				$level = '03';
			} elseif ( $pixelsPerSecond <= 3686400 ) { // <= 1080p@60fps or 1440p@30fps
				$level = '04';
			} elseif ( $pixelsPerSecond <= 7372800 ) { // <= 4K@30fps
				$level = '05';
			} else {
				$level = '06'; // Higher resolutions or frame rates
			}
		}

		// Check for tier, assume Main Tier by default
		if ( isset( $metadata['video']['tier'] ) && $metadata['video']['tier'] === 'high' ) {
			$tier = 'H'; // High Tier
		}

		// Construct the codec string
		return "av01.$profile.$level$tier.$bitDepth";
	}

	/**
	 * @param File $file
	 * @return string[]|false
	 */
	public function getStreamTypes( $file ) {
		$streamTypes = [];
		$metadata = $this->unpackMetadata( $file->getMetadata() );
		if ( !$metadata || isset( $metadata['error'] ) ) {
			return false;
		}
		// id3 gives 'V_VP8' for what we call VP8
		if ( isset( $metadata['video'] ) ) {
			if ( $metadata['video']['dataformat'] === 'vp8' ) {
				$streamTypes[] = 'VP8';
			} elseif ( $metadata['video']['dataformat'] === 'vp9'
				|| $metadata['video']['dataformat'] === 'V_VP9'
			) {
				// Currently getID3 calls it V_VP9. That will probably change to vp9
				// once getID3 actually gets support for the codec.
				$streamTypes[] = 'VP9';
			} elseif ( $metadata['video']['dataformat'] === 'V_AV1' ) {
				$streamTypes[] = $this->getAV1CodecString( $metadata );
			}
		}
		if ( isset( $metadata['audio'] ) ) {
			if ( $metadata['audio']['dataformat'] === 'vorbis' ) {
				$streamTypes[] = 'Vorbis';
			} elseif ( $metadata['audio']['dataformat'] === 'opus'
				|| $metadata['audio']['dataformat'] === 'A_OPUS'
			) {
				// Currently getID3 calls it A_OPUS. That will probably change to 'opus'
				// once getID3 actually gets support for the codec.
				$streamTypes[] = 'opus';
			}
		}

		return $streamTypes;
	}