AVCSequenceParameterSetReader::readData

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Syntax Syntax

AVCSequenceParameterSetReader::readData()

Source Source

File: wp-includes/ID3/module.audio-video.flv.php

		$this->sps = $sps;
	}

	public function readData() {
		$this->skipBits(8);
		$this->skipBits(8);
		$profile = $this->getBits(8);                               // read profile
		if ($profile > 0) {
			$this->skipBits(8);
			$level_idc = $this->getBits(8);                         // level_idc
			$this->expGolombUe();                                   // seq_parameter_set_id // sps
			$this->expGolombUe();                                   // log2_max_frame_num_minus4
			$picOrderType = $this->expGolombUe();                   // pic_order_cnt_type
			if ($picOrderType == 0) {
				$this->expGolombUe();                               // log2_max_pic_order_cnt_lsb_minus4
			} elseif ($picOrderType == 1) {
				$this->skipBits(1);                                 // delta_pic_order_always_zero_flag
				$this->expGolombSe();                               // offset_for_non_ref_pic
				$this->expGolombSe();                               // offset_for_top_to_bottom_field
				$num_ref_frames_in_pic_order_cnt_cycle = $this->expGolombUe(); // num_ref_frames_in_pic_order_cnt_cycle
				for ($i = 0; $i < $num_ref_frames_in_pic_order_cnt_cycle; $i++) {
					$this->expGolombSe();                           // offset_for_ref_frame[ i ]
				}
			}
			$this->expGolombUe();                                   // num_ref_frames
			$this->skipBits(1);                                     // gaps_in_frame_num_value_allowed_flag
			$pic_width_in_mbs_minus1 = $this->expGolombUe();        // pic_width_in_mbs_minus1
			$pic_height_in_map_units_minus1 = $this->expGolombUe(); // pic_height_in_map_units_minus1

			$frame_mbs_only_flag = $this->getBits(1);               // frame_mbs_only_flag
			if ($frame_mbs_only_flag == 0) {
				$this->skipBits(1);                                 // mb_adaptive_frame_field_flag
			}
			$this->skipBits(1);                                     // direct_8x8_inference_flag
			$frame_cropping_flag = $this->getBits(1);               // frame_cropping_flag

			$frame_crop_left_offset   = 0;
			$frame_crop_right_offset  = 0;
			$frame_crop_top_offset    = 0;
			$frame_crop_bottom_offset = 0;

			if ($frame_cropping_flag) {
				$frame_crop_left_offset   = $this->expGolombUe();   // frame_crop_left_offset
				$frame_crop_right_offset  = $this->expGolombUe();   // frame_crop_right_offset
				$frame_crop_top_offset    = $this->expGolombUe();   // frame_crop_top_offset
				$frame_crop_bottom_offset = $this->expGolombUe();   // frame_crop_bottom_offset
			}
			$this->skipBits(1);                                     // vui_parameters_present_flag
			// etc

			$this->width  = (($pic_width_in_mbs_minus1 + 1) * 16) - ($frame_crop_left_offset * 2) - ($frame_crop_right_offset * 2);

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