How to use PHP for audio file processing?

With the widespread use of audio files, more and more applications require audio file processing. PHP is a popular server-side scripting language that can be used to process audio files. This article will introduce how to use PHP for audio file processing.

1. Understand audio file formats

Before using PHP to process audio files, you need to understand audio files in different formats. Common audio file formats include MP3, WAV, FLAC, etc. These file formats have different encoding methods, compression methods and data storage methods. When processing audio files, you need to choose different processing methods according to the file format.

2. Reading audio files

PHP provides many functions and classes for reading audio files. Commonly used functions include file_get_contents(), fread(), fgets(), etc. If you want to read a large audio file, you can use the fread() function, which can read the file in chunks. If you want to read a text file, you can use the fgets() function to read the file contents line by line.

3. Process audio files

After reading the audio file, various processing needs to be performed. These processes include audio file conversion, audio file clipping, and audio file merging.

1. Audio file conversion

PHP can convert audio files in different formats into other formats. For example, you can convert audio files in MP3 format to WAV format files.

Use the FFmpeg library in PHP for audio file conversion:

<?php
exec("ffmpeg -i input.mp3 output.wav");
?>

2. Audio file clipping

You can use PHP to intercept specific parts of the audio file. For example, you can capture the first 30 seconds of a song.

Use PHP's built-in audio processing library - Sonic

<?php
include_once('sonic.php');
$sonic = new Sonic(44100, 2);
$input_file = 'song.mp3';
$output_file = 'song-30-seconds.mp3';
$sonic->open(44100, 2);
$fp = fopen($input_file, 'rb');
$fout = fopen($output_file, 'wb');
$end_pos = 44100 * 2 * 30;
$cur_pos = 0;
while ($buffer = fread($fp, 4096*2))
{
    $cur_pos += 4096*2;
    if ($cur_pos > $end_pos) break;
    fwrite($fout, $sonic->addData($buffer));
}
$sonic->flush();
fwrited($fout, $sonic->getdata());
$sonic->close();
fclose($fp);
fclose($fout);
?>

3. Audio file merging

You can use PHP to merge multiple audio files into one file. For example, multiple songs can be combined into a complete album.

Use the FFmpeg library in PHP to merge audio files:

<?php
exec("ffmpeg -i 'concat:1.mp3|2.mp3|3.mp3' output.mp3");
?>

4. Save the audio file

After processing the audio file, you need to save it to the hard disk or upload it to the server. You can use functions such as fwrite() and file_put_contents() in PHP to write files to disk or upload them to the server.

<?php
file_put_contents('output.mp3', $output_data);
?>

The above is a brief introduction on how to use PHP for audio file processing. By studying this article, readers can learn how to read, process and save audio files in PHP. It is hoped that readers can have a deeper understanding and use of this knowledge in practical applications.

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