Audero Wav Extractor is a PHP library that allows to extract a chunk from a wav file. The extracted chunk can be saved on the hard disk, can be forced to be prompted as download by the user's browser or returned as a string for a later processing.

This library requires PHP version 5.3 or higher.

You can obtain "Audero Wav Extractor" via Composer adding the following lines to your composer.json:

"require": {
    "audero/audero-wav-extractor": "2.0.*"
}

And then run the install command to resolve and download the dependencies:

php composer.phar install

Composer will install the library to your project's vendor/audero directory.

If you haven't or don't want to use Composer, you can download the library from its repository via Git running the following command:

git clone https://github.com/AurelioDeRosa/Audero-Wav-Extractor.git

"Audero Wav Extractor" is very easy to use. However, since the library uses namespaces and follows the PSR standards, you've to use an autoloader to dynamically load the classes needed. After that, you have to create an AuderoWavExtractor instance and call the method that better fits your needs. With Audero Wav Extractor you can download the chunk using downloadChunk(), save it on the hard disk using saveChunk() or retrieve it as a string using getChunk().

If you installed "Audero Wav Extractor" using Composer, you can rely on the built autoloader. So, after included the latter, you can use one of the previously cited methods as shown in the following example.

<?php
    // Include the Composer autoloader
    require_once 'vendor/autoload.php';

    $inputFile = 'sample1.wav';
    $outputFile = 'chunk.wav';
    $start = 0 * 1000; // From 0 seconds
    $end = 2 * 1000; // To 2 seconds

    // Extract the chunk and save it on the hard disk
    try {
       $extractor = new \Audero\WavExtractor\AuderoWavExtractor($inputFile);
       $extractor->downloadChunk($start, $end, $outputFile);
       echo 'Chunk extraction completed.';
    } catch (\Exception $ex) {
       echo 'An error has occurred: ' . $ex->getMessage();
    }
?>

If you obtained the code via Git, you can use the autoloader provided by the library. However, before using it, you've to add the path to the library to the PHP include path as shown in the following example.

<?php
    // Set include path
    set_include_path(get_include_path() . PATH_SEPARATOR . __DIR__ . '/../src/');
    // Include the class loader
    require_once 'Audero\Loader\AutoLoader.php';
    // Set the classes' loader method
    spl_autoload_register('Audero\Loader\AutoLoader::autoload');

    $inputFile = 'sample1.wav';
    $outputFile = 'chunk.wav';
    $start = 0 * 1000; // From 0 seconds
    $end = 2 * 1000; // To 2 seconds

    // Extract the chunk and force the download to the user browser
    try {
       $extractor = new \Audero\WavExtractor\AuderoWavExtractor($inputFile);
       $extractor->saveChunk($start, $end, $outputFile);
       echo 'Chunk extraction completed.';
    } catch (\Exception $ex) {
       echo 'An error has occurred: ' . $ex->getMessage();
    }
?>

• http://www.sonicspot.com/guide/wavefiles.html
• http://www-mmsp.ece.mcgill.ca/documents/AudioFormats/WAVE/WAVE.html

Audero Wav Extractor is licensed under the CC BY-NC 3.0 ("Creative Commons Attribution NonCommercial 3.0")

Aurelio De Rosa (Twitter: @AurelioDeRosa)