How to use PHP to implement the audio editing function of WeChat applet?

How to use PHP to implement the audio editing function of WeChat applet?

With the rapid development of WeChat mini programs, audio editing functions have gradually become one of users’ expectations for mini programs. In this article, we will explore how to use PHP language to implement the audio editing function of WeChat applet and provide some specific code examples.

1. Preparation work
   First, we need to prepare a development environment for a small program. This includes the AppID and AppSecret of a WeChat applet. This information can be applied for on the WeChat open platform. At the same time, we also need a server environment to run our PHP code.
2. Get audio files
   Using the API of WeChat applet, we can allow users to select or record audio files locally from the mobile phone and upload them to the server. We can achieve this function through the following code:

wx.chooseAudio({
    success: function (res) {
        var tempFilePaths = res.tempFilePaths;
        // 将音频文件上传到服务器
        wx.uploadFile({
            url: '服务器地址',
            filePath: tempFilePaths[0],
            name: 'file',
            success: function (res) {
                var data = res.data;
                // 服务器返回的音频文件URL
                console.log(data);
            }
        })
    }
})

3. Audio editing function
   Next, we will use PHP to implement some common audio editing functions, such as audio cropping and volume adjustment .

3.1 Audio cropping
We can use PHP's audio processing library ffmpeg to crop audio files. First, install the ffmpeg library:

sudo apt-get install ffmpeg

Then, use the following code example to crop the audio file:

$inputFile = 'input.mp3';
$outputFile = 'output.mp3';
$start = 10;
$duration = 5;

// 使用ffmpeg裁剪音频
exec("ffmpeg -i $inputFile -ss $start -t $duration -acodec copy $outputFile");

3.2 Volume adjustment
Using PHP's audio processing library audiowaveform, we can achieve audio file adjustment volume adjustment. First, install the audiowaveform library:

sudo apt-get install libaudiowaveform-dev

Then, use the following code example to adjust the volume of the audio file:

$inputFile = 'input.mp3';
$outputFile = 'output.mp3';
$gain = 2;

// 使用audiowaveform调节音量
exec("audiowaveform -i $inputFile -g $gain -o $outputFile");

4. Return the results to the applet
   Finally, we use PHP to edit The final audio file URL is returned to the applet. We can use the following code to return the URL to the applet:

$url = '编辑后的音频文件URL';

// 返回URL给小程序
echo json_encode(['url' => $url]);

In the applet, we can use the following code to obtain and use the edited audio file:

wx.request({
    url: 'PHP文件的URL',
    success: function (res) {
        var url = res.data.url;
        // 使用编辑后的音频文件
    }
})

In summary As mentioned above, by using the PHP language and the corresponding audio processing library, we can easily implement the audio editing function. Hope this article is helpful to you!

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