Function skipHrdParameters

src/codec_data.ts:778–836

(
	bitstream: Bitstream,
	commonInfPresentFlag: boolean,
	maxNumSubLayersMinus1: number,
)

};

const skipHrdParameters = (
	bitstream: Bitstream,
	commonInfPresentFlag: boolean,
	maxNumSubLayersMinus1: number,
) => {
	let nal_hrd_parameters_present_flag = false;
	let vcl_hrd_parameters_present_flag = false;
	let sub_pic_hrd_params_present_flag = false;

	if (commonInfPresentFlag) {
		nal_hrd_parameters_present_flag = bitstream.readBits(1) === 1;
		vcl_hrd_parameters_present_flag = bitstream.readBits(1) === 1;
		if (nal_hrd_parameters_present_flag || vcl_hrd_parameters_present_flag) {
			sub_pic_hrd_params_present_flag = bitstream.readBits(1) === 1;
			if (sub_pic_hrd_params_present_flag) {
				bitstream.readBits(8); // tick_divisor_minus2
				bitstream.readBits(5); // du_cpb_removal_delay_increment_length_minus1
				bitstream.readBits(1); // sub_pic_cpb_params_in_pic_timing_sei_flag
				bitstream.readBits(5); // dpb_output_delay_du_length_minus1
			}
			bitstream.readBits(4); // bit_rate_scale
			bitstream.readBits(4); // cpb_size_scale
			if (sub_pic_hrd_params_present_flag) {
				bitstream.readBits(4); // cpb_size_du_scale
			}
			bitstream.readBits(5); // initial_cpb_removal_delay_length_minus1
			bitstream.readBits(5); // au_cpb_removal_delay_length_minus1
			bitstream.readBits(5); // dpb_output_delay_length_minus1
		}
	}

	for (let i = 0; i <= maxNumSubLayersMinus1; i++) {
		const fixed_pic_rate_general_flag = bitstream.readBits(1) === 1;
		let fixed_pic_rate_within_cvs_flag = true; // Default assumption if general is true
		if (!fixed_pic_rate_general_flag) {
			fixed_pic_rate_within_cvs_flag = bitstream.readBits(1) === 1;
		}

		let low_delay_hrd_flag = false; // Default assumption
		if (fixed_pic_rate_within_cvs_flag) {
			readExpGolomb(bitstream); // elemental_duration_in_tc_minus1[i]
		} else {
			low_delay_hrd_flag = bitstream.readBits(1) === 1;
		}

		let CpbCnt = 1; // Default if low_delay is true
		if (!low_delay_hrd_flag) {
			const cpb_cnt_minus1 = readExpGolomb(bitstream); // cpb_cnt_minus1[i]
			CpbCnt = cpb_cnt_minus1 + 1;
		}

		if (nal_hrd_parameters_present_flag) {
			skipSubLayerHrdParameters(bitstream, CpbCnt, sub_pic_hrd_params_present_flag);
		}
		if (vcl_hrd_parameters_present_flag) {
			skipSubLayerHrdParameters(bitstream, CpbCnt, sub_pic_hrd_params_present_flag);
		}
	}