<?php

// +----------------------------------------------------------------------+
// | PHP version 4.1.0                                                    |
// +----------------------------------------------------------------------+
// | Placed in public domain by Allan Hansen, 2002. Share and enjoy!      |
// +----------------------------------------------------------------------+
// | /demo/demo.audioinfo.class.php                                       |
// |                                                                      |
// | Example wrapper class to extract information from audio files        |
// | through getID3().                                                    |
// |                                                                      |
// | getID3() returns a lot of information. Much of this information is   |
// | not needed for the end-application. It is also possible that some    |
// | users want to extract specific info. Modifying getID3() files is a   |
// | bad idea, as modifications needs to be done to future versions of    |
// | getID3().                                                            |
// |                                                                      |
// | Modify this wrapper class instead. This example extracts certain     |
// | fields only and adds a new root value - encoder_options if possible. |
// | It also checks for mp3 files with wave headers.                      |
// +----------------------------------------------------------------------+
// | Example code:                                                        |
// |   $au = new AudioInfo();                                             |
// |   print_r($au->Info('file.flac');                                    |
// +----------------------------------------------------------------------+
// | Authors: Allan Hansen <ahØartemis*dk>                                |
// +----------------------------------------------------------------------+
//


/**
* getID3() settings
*/

require_once('../getid3/getid3.php');


/**
* Class for extracting information from audio files with getID3().
*/

class AudioInfo
{

    /**
    * Private variables
    */
    var $result = null;
    var $info   = null;


    /**
    * Constructor
    */

    function AudioInfo()
    {

        // Initialize getID3 engine
        $this->getID3 = new getID3;
        $this->getID3->option_md5_data        = true;
        $this->getID3->option_md5_data_source = true;
        $this->getID3->encoding               = 'UTF-8';
    }


    /**
    * Extract information - only public function
    *
    * @access   public
    * @param    string  file    Audio file to extract info from.
    */

    function Info($file)
    {

        // Analyze file
        $this->info = $this->getID3->analyze($file);

        // Exit here on error
        if (isset($this->info['error'])) {
            return  ['error' => $this->info['error']];
        }

        // Init wrapper object
        $this->result = [];
        $this->result['format_name']     = (isset($this->info['fileformat']) ? $this->info['fileformat'] : '').'/'.(isset($this->info['audio']['dataformat']) ? $this->info['audio']['dataformat'] : '').(isset($this->info['video']['dataformat']) ? '/'.$this->info['video']['dataformat'] : '');
        $this->result['encoder_version'] = (isset($this->info['audio']['encoder'])         ? $this->info['audio']['encoder']         : '');
        $this->result['encoder_options'] = (isset($this->info['audio']['encoder_options']) ? $this->info['audio']['encoder_options'] : '');
        $this->result['bitrate_mode']    = (isset($this->info['audio']['bitrate_mode'])    ? $this->info['audio']['bitrate_mode']    : '');
        $this->result['channels']        = (isset($this->info['audio']['channels'])        ? $this->info['audio']['channels']        : '');
        $this->result['sample_rate']     = (isset($this->info['audio']['sample_rate'])     ? $this->info['audio']['sample_rate']     : '');
        $this->result['bits_per_sample'] = (isset($this->info['audio']['bits_per_sample']) ? $this->info['audio']['bits_per_sample'] : '');
        $this->result['playing_time']    = (isset($this->info['playtime_seconds'])         ? $this->info['playtime_seconds']         : '');
        $this->result['avg_bit_rate']    = (isset($this->info['audio']['bitrate'])         ? $this->info['audio']['bitrate']         : '');
        $this->result['tags']            = (isset($this->info['tags'])                     ? $this->info['tags']                     : '');
        $this->result['comments']        = (isset($this->info['comments'])                 ? $this->info['comments']                 : '');
        $this->result['warning']         = (isset($this->info['warning'])                  ? $this->info['warning']                  : '');
        $this->result['md5']             = (isset($this->info['md5_data'])                 ? $this->info['md5_data']                 : '');

        // Post getID3() data handling based on file format
        $method = (isset($this->info['fileformat']) ? $this->info['fileformat'] : '').'Info';
        if ($method && method_exists($this, $method)) {
            $this->$method();
        }

        return $this->result;
    }


    /**
    * post-getID3() data handling for AAC files.
    *
    * @access   private
    */

    function aacInfo()
    {
        $this->result['format_name']     = 'AAC';
    }


    /**
    * post-getID3() data handling for Wave files.
    *
    * @access   private
    */

    function riffInfo()
    {
        if ($this->info['audio']['dataformat'] == 'wav') {
            $this->result['format_name'] = 'Wave';
        } elseif (preg_match('#^mp[1-3]$#', $this->info['audio']['dataformat'])) {
            $this->result['format_name'] = strtoupper($this->info['audio']['dataformat']);
        } else {
            $this->result['format_name'] = 'riff/'.$this->info['audio']['dataformat'];
        }
    }


    /**
    * * post-getID3() data handling for FLAC files.
    *
    * @access   private
    */

    function flacInfo()
    {
        $this->result['format_name']     = 'FLAC';
    }


    /**
    * post-getID3() data handling for Monkey's Audio files.
    *
    * @access   private
    */

    function macInfo()
    {
        $this->result['format_name']     = 'Monkey\'s Audio';
    }


    /**
    * post-getID3() data handling for Lossless Audio files.
    *
    * @access   private
    */

    function laInfo()
    {
        $this->result['format_name']     = 'La';
    }


    /**
    * post-getID3() data handling for Ogg Vorbis files.
    *
    * @access   private
    */

    function oggInfo()
    {
        if ($this->info['audio']['dataformat'] == 'vorbis') {
            $this->result['format_name']     = 'Ogg Vorbis';
        } else if ($this->info['audio']['dataformat'] == 'flac') {
            $this->result['format_name'] = 'Ogg FLAC';
        } else if ($this->info['audio']['dataformat'] == 'speex') {
            $this->result['format_name'] = 'Ogg Speex';
        } else {
            $this->result['format_name'] = 'Ogg '.$this->info['audio']['dataformat'];
        }
    }


    /**
    * post-getID3() data handling for Musepack files.
    *
    * @access   private
    */

    function mpcInfo()
    {
        $this->result['format_name']     = 'Musepack';
    }


    /**
    * post-getID3() data handling for MPEG files.
    *
    * @access   private
    */

    function mp3Info()
    {
        $this->result['format_name']     = 'MP3';
    }


    /**
    * post-getID3() data handling for MPEG files.
    *
    * @access   private
    */

    function mp2Info()
    {
        $this->result['format_name']     = 'MP2';
    }


    /**
    * post-getID3() data handling for MPEG files.
    *
    * @access   private
    */

    function mp1Info()
    {
        $this->result['format_name']     = 'MP1';
    }


    /**
    * post-getID3() data handling for WMA files.
    *
    * @access   private
    */

    function asfInfo()
    {
        $this->result['format_name']     = strtoupper($this->info['audio']['dataformat']);
    }


    /**
    * post-getID3() data handling for Real files.
    *
    * @access   private
    */

    function realInfo()
    {
        $this->result['format_name']     = 'Real';
    }


    /**
    * post-getID3() data handling for VQF files.
    *
    * @access   private
    */

    function vqfInfo()
    {
        $this->result['format_name']     = 'VQF';
    }
}