How to implement audio uploading and processing in PHP

With the popularity of audio files, more and more websites need to support audio upload and processing functions. Audio uploading and processing is an integral part of modern websites. This article will introduce how to implement audio uploading and processing in PHP.

1. Audio upload

1. Use of upload control

In HTML, you can use the type attribute of the input tag to be file to create an upload file. of controls.

<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="audioFile" accept=".mp3,.wav">
    <input type="submit" value="上传">
</form>

Among them, the action attribute is the address of form submission, and the enctype attribute is the form data type. It must be set to "multipart/form-data", otherwise the file cannot be uploaded.

2. PHP handles uploaded files

PHP provides a $_FILES array to process uploaded files. This array contains all the information of the uploaded files. When processing uploaded files, you need to first determine whether the file is uploaded successfully and then process it.

if($_FILES["audioFile"]["error"] > 0) {
    echo "上传错误：" . $_FILES["audioFile"]["error"];
} else {
    // 文件上传成功，进行文件处理
}

Among them, $_FILES"audioFile" is the error code of the uploaded file. If it is greater than 0, the upload fails.

2. Audio processing

1. Getting file information

Getting the uploaded file information is the first step in file processing. PHP's getID3 library provides a convenient way to obtain file information. You can use the following code to get basic information about an audio file.

require_once('getID3-master/getid3/getid3.php');
$getID3 = new getID3;
$fileInfo = $getID3->analyze($_FILES["audioFile"]["tmp_name"]);

Among them, getid3.php is the main file of the getID3 library and must be imported. $getID3 is an instance of the getid3 class, and $fileInfo contains detailed information about the audio file.

2. Transcoding

In order to support cross-platform compatibility, transcoding is required when uploading audio files. You can use PHP's built-in library for transcoding.

$fileName = $_FILES["audioFile"]["name"];
$ext = pathinfo($fileName, PATHINFO_EXTENSION); // 获取文件扩展名
$newFileName = uniqid() . "." . $ext; // 生成新文件名
$destPath = "uploads/" . $newFileName;
move_uploaded_file($_FILES["audioFile"]["tmp_name"], $destPath); // 移动文件到目标路径

3. Compression

If the uploaded audio file is large in size, it needs to be compressed in order to speed up web page loading. Compression can be done using PHP's audio-convert library.

require_once('audio-convert-master/AudioConvert.php');
use PHPAudioConvertAudioConvert;

$acr = AudioConvert::create();
$acr->inputFile($destPath);
$acr->outputBitrate("32k");
$acr->outputFormat("mp3");
$acr->outputFile("output.mp3");

Among them, the audio-convert library is an open source PHP audio processing library that can convert audio files to different formats and bit rates.

4. Get audio data

When processing audio files, sometimes it is necessary to extract data from the audio files, such as timestamp, number of channels, sampling rate, sampling bit depth, etc. . This data can be obtained using the getID3 library.

$timeLength = $fileInfo['playtime_seconds']; // 音频时长(秒)
$channels = $fileInfo['audio']['channels']; // 音频声道数(单声道/立体声/环绕声等)
$sampleRate = $fileInfo['audio']['sample_rate']; // 音频采样率(比特数/秒)
$bitsPerSample = $fileInfo['audio']['bits_per_sample']; // 音频采样位深，采样每个点的比特数

5. Audio processing related applications

In practical applications, there are many requirements for processing audio files. For example:

• Perform editing operations such as cropping, splicing, and synthesis of audio files.
• Analyze audio files to identify music beat, pitch, rewind and normal sounds, etc.
• Realize the playback effects of audio files, such as array sound, metrobol and delay, etc.

For the above applications, open source PHP audio processing libraries such as audiowaveform, audiogen, etc. can be used to implement corresponding functions. These libraries have detailed documentation and sample code for reference.

Conclusion

This article introduces how to implement audio upload and processing in PHP, including the use of upload controls, file processing methods, audio transcoding, compression and acquisition of audio data, etc. By reading this article, I hope readers can better understand the relevant knowledge of PHP audio processing and realize their own audio processing needs.

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