getid3_ogg::get_quality_from_nominal

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Description

Usage

getid3_ogg::get_quality_from_nominal_bitrate( $nominal_bitrate );

Parameters

$nominal_bitrate: ( mixed ) required –

Returns

void

Source

File name: wordpress/wp-includes/ID3/module.audio.ogg.php
Lines: 1 to 22 of 22

  public static function get_quality_from_nominal_bitrate($nominal_bitrate) {

    // decrease precision
    $nominal_bitrate = $nominal_bitrate / 1000;

    if ($nominal_bitrate < 128) {
      // q-1 to q4
      $qval = ($nominal_bitrate - 64) / 16;
    } elseif ($nominal_bitrate < 256) {
      // q4 to q8
      $qval = $nominal_bitrate / 32;
    } elseif ($nominal_bitrate < 320) {
      // q8 to q9
      $qval = ($nominal_bitrate + 256) / 64;
    } else {
      // q9 to q10
      $qval = ($nominal_bitrate + 1300) / 180;
    }
    //return $qval; // 5.031324
    //return intval($qval); // 5
    return round($qval, 1); // 5 or 4.9
  }

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