Defined (1)

The class is defined in the following location(s).

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

class AVCSequenceParameterSetReader { 
    public $sps; 
    public $start = 0; 
    public $currentBytes = 0; 
    public $currentBits = 0; 
    public $width; 
    public $height; 
 
    public function __construct($sps) { 
        $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); 
            $this->height = ((2 - $frame_mbs_only_flag) * ($pic_height_in_map_units_minus1 + 1) * 16) - ($frame_crop_top_offset * 2) - ($frame_crop_bottom_offset * 2); 
        } 
    } 
 
    public function skipBits($bits) { 
        $newBits = $this->currentBits + $bits; 
        $this->currentBytes += (int)floor($newBits / 8); 
        $this->currentBits = $newBits % 8; 
    } 
 
    public function getBit() { 
        $result = (getid3_lib::BigEndian2Int(substr($this->sps, $this->currentBytes, 1)) >> (7 - $this->currentBits)) & 0x01; 
        $this->skipBits(1); 
        return $result; 
    } 
 
    public function getBits($bits) { 
        $result = 0; 
        for ($i = 0; $i < $bits; $i++) { 
            $result = ($result << 1) + $this->getBit(); 
        } 
        return $result; 
    } 
 
    public function expGolombUe() { 
        $significantBits = 0; 
        $bit = $this->getBit(); 
        while ($bit == 0) { 
            $significantBits++; 
            $bit = $this->getBit(); 
 
            if ($significantBits > 31) { 
                // something is broken, this is an emergency escape to prevent infinite loops 
                return 0; 
            } 
        } 
        return (1 << $significantBits) + $this->getBits($significantBits) - 1; 
    } 
 
    public function expGolombSe() { 
        $result = $this->expGolombUe(); 
        if (($result & 0x01) == 0) { 
            return -($result >> 1); 
        } else { 
            return ($result + 1) >> 1; 
        } 
    } 
 
    public function getWidth() { 
        return $this->width; 
    } 
 
    public function getHeight() { 
        return $this->height; 
    } 
}