是否可以在iOS中使用Codename One录制音频? [英] Is it possible to record audio in iOS with Codename One?

问题描述

我的应用程序具有一个用于录制音频的按钮(另一个用于在录制结束时播放音频的按钮).我将录制的音频文件发送到服务器上.在Android上，文件记录为.amr(MIME类型音频/amr)，可以播放.

My app features a button to record audio (and another to play it back when the recording is over). I send the recorded audio files on a server. On Android the files is recorded as .amr (mime type audio/amr) and can be played back.

但是在iOS上，该文件无法在设备(iPhone 4或4S)或计算机上播放. ffmpeg -i报告

On iOS however the file can neither be played back on the device (iPhone 4 or 4S) nor on a computer. ffmpeg -i reports

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x2fac120] moov atom not found
9gMjOnnmsj9JJZR3.m4a: Invalid data found when processing input

请注意，VLC也无法播放.

我给m4a扩展名是因为录音机使用了它(以及aac编解码器).

I give the m4a extension because Voice recorder uses it (along with aac codec).

这是我使用的代码(主要基于

Here is the code I use (mostly based on https://github.com/codenameone/CodenameOne/blob/master/Ports/iOSPort/src/com/codename1/impl/ios/IOSImplementation.java#L2768-L2794 ) :

audioMemoPath = ParametresGeneraux.getWRITABLE_DIR() + "AudioMemo-"
            + System.currentTimeMillis() + 
            (Display.getInstance().getPlatformName().equals("and")
            ? ".amr"
            : ".m4a");
audioMemoMimeType = MediaManager.getAvailableRecordingMimeTypes()[0];

audioMemoRecorder = MediaManager.createMediaRecorder(audioMemoPath, audioMemoMimeType);

// If the permission audio has not been granted 
// the audiomemorecoreder will be null
     if (audioMemoRecorder != null) {
           audioMemoRecorder.play();
           boolean b = Dialog.show("Recording", "", "Save", "Cancel");
           audioMemoRecorder.pause();
           audioMemoRecorder.cleanup();

            ...
        }

此外，如果我在iOS上显示可用的mime类型，它会产生音频/amr"，根据我能读到的所有告诉您在iOS上不支持amr的帖子，我对此表示怀疑.从源头看，默认情况下，amr是默认的mime类型，因为它总是返回:

Moreover if I display the available mime types on iOS, it yields "audio/amr" which I doubt according to all the posts I could read that tell you amr is not supported on iOS. Looking at the source it appears amr is the by default mime type because it is always returned :

/**
 * Gets the available recording MimeTypes
 */ 
public String [] getAvailableRecordingMimeTypes(){
    return new String[]{"audio/amr"};
}

所以我的问题是:是否可以在iOS上录制音频，如果可以，该怎么办?

So my question : is it possible to record audio on iOS, and if it is, how can it be done ?

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推荐答案

好吧，我通过重载MediaManager的某些方法(即getAvailableRecordingMimeTypes()和createMediaRecorder())来防止其使用其getAvailableRecordingMimeTypes来使其正常工作方法.

Ok I got it working by overloading some methods of the MediaManager, namely getAvailableRecordingMimeTypes() and also createMediaRecorder() to prevent it from using its getAvailableRecordingMimeTypes method.

这是getAvailableRecordingMimeTypes()的代码:

Here is the code for getAvailableRecordingMimeTypes():

    /**
 * Normally the method returns amr even for ios. So we overload the original
 * method to return aac on ios.
 * @return 
 */
public static String[] getAvailableRecordingMimeTypes() {
    if (Display.getInstance().getPlatformName().equals("ios")) {
        return new String[]{"audio/aac"};
    } else {
        return new String[]{"audio/amr"};
    }

}

createMediaRecorder()保持不变(复制而未更改).

createMediaRecorder() is left as is (copied without changes).

现在可以在iOS中录制音频并在iOS和Android中播放！

Now it is possible to record audio in iOS and play it back in both iOS and Android!

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