Function generateHevcCodecString

src/codec_data.ts:854–881

(record: HevcDecoderConfigurationRecord)

};

export const generateHevcCodecString = (record: HevcDecoderConfigurationRecord) => {
	const generalProfileSpace = record.generalProfileSpace;
	const generalProfileIdc = record.generalProfileIdc;
	const compatibilityFlags = reverseBitsU32(record.generalProfileCompatibilityFlags);
	const generalTierFlag = record.generalTierFlag;
	const generalLevelIdc = record.generalLevelIdc;
	const constraintFlags = [...record.generalConstraintIndicatorFlags];

	let codecString = 'hev1.';

	codecString += ['', 'A', 'B', 'C'][generalProfileSpace] + generalProfileIdc;
	codecString += '.';
	codecString += compatibilityFlags.toString(16).toUpperCase();
	codecString += '.';
	codecString += generalTierFlag === 0 ? 'L' : 'H';
	codecString += generalLevelIdc;

	while (constraintFlags.length > 0 && constraintFlags[constraintFlags.length - 1] === 0) {
		constraintFlags.pop();
	}

	if (constraintFlags.length > 0) {
		codecString += '.';
		codecString += constraintFlags.map(x => x.toString(16).toUpperCase()).join('.');
	}

	return codecString;
};

/** Serializes an HevcDecoderConfigurationRecord into the format specified in Section 8.3.3.1 of ISO 14496-15. */
export const serializeHevcDecoderConfigurationRecord = (record: HevcDecoderConfigurationRecord) => {