如何在安卓系统中将音频从立体声转换为单声道？

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问题描述

我使用android.provider.mediaStore.Audio.Media.external_Content_Uri意图从SD卡加载音乐文件.

Intent tmpIntent1 = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(tmpIntent1, 0);

和onActivityResult

Uri mediaPath = Uri.parse(data.getData().toString());
MediaPlayer mp = MediaPlayer.create(this, mediaPath);
mp.start();

现在MediaPlayer在立体声中播放音频.是否有任何方法可以将所选音乐/音频文件或从立体声转换为应用程序本身的单声道?

我向期为 soundpool 和 audiotrack ，但没有找到如何将mp3文件音频转换为单声道.

PowerLAMP这样的应用程序有那些立体声<- >单声道交换机，当按下时，当按下立即将输出音频转换为单声道信号并再次返回，它们如何进行?

推荐答案

您是否分别加载.wav-文件分别pcm-data?如果是这样，那么您可以轻松读取每个通道的每个样本，叠加它们并将它们除以通道的量以获得单声道信号.

如果将立体声信号以交错的签名短路的形式存储，则要计算结果的单声道信号的代码可能如下所示:

    short[] stereoSamples;//get them from somewhere

    //output array, which will contain the mono signal
    short[] monoSamples= new short[stereoSamples.length/2];
    //length of the .wav-file header-> 44 bytes
    final int HEADER_LENGTH=22;

    //additional counter
    int k=0;


    for(int i=0; i< monoSamples.length;i++){
        //skip the header andsuperpose the samples of the left and right channel
        if(k>HEADER_LENGTH){
        monoSamples[i]= (short) ((stereoSamples[i*2]+ stereoSamples[(i*2)+1])/2);
        }
        k++;
    }

我希望，我能够帮助你.

最好的问候， g_j

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问题描述

I use the android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI intent to load music files from the SD Card.

Intent tmpIntent1 = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(tmpIntent1, 0);

and in onActivityResult

Uri mediaPath = Uri.parse(data.getData().toString());
MediaPlayer mp = MediaPlayer.create(this, mediaPath);
mp.start();

Now MediaPlayer plays the audio in stereo. Is there any way to convert the selected music/audio file or the output from stereo to mono in the app itself?

I looked up API for SoundPool and AudioTrack, but didn't find how to convert mp3 files audio to mono.

Apps like PowerAMP have those Stereo <-> Mono switches that when pressed immediately convert the output audio to mono signal and back again, how do they do it?

推荐答案

Do you load .wav- files respectively PCM- data? If so then you could easily read each sample of each channel, superpose them and divide them by the amount of channels to get a mono signal.

If you store your stereo signal in form of interleaved signed shorts, the code to calculate the resulting mono signal might look like this:

    short[] stereoSamples;//get them from somewhere

    //output array, which will contain the mono signal
    short[] monoSamples= new short[stereoSamples.length/2];
    //length of the .wav-file header-> 44 bytes
    final int HEADER_LENGTH=22;

    //additional counter
    int k=0;


    for(int i=0; i< monoSamples.length;i++){
        //skip the header andsuperpose the samples of the left and right channel
        if(k>HEADER_LENGTH){
        monoSamples[i]= (short) ((stereoSamples[i*2]+ stereoSamples[(i*2)+1])/2);
        }
        k++;
    }

I hope, I was able to help you.

Best regards, G_J

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