录制WAV文件从Android的麦克风 - 问题 [英] Recording a wav file from the mic in Android - problems

问题描述

我需要能够创建一个使用Android中的麦克风WAV文件。目前，我有很多的麻烦。到目前为止，这是我的情况。我使用的micDroid项目code部位从而记录：

I need to be able to create a WAV file using the mic in Android. Currently, I'm having a lot of trouble. So far, this is my situation. I'm using parts of the micDroid project code to record thus:

//read thread


int sampleRate = 44100;
int bufferSize = AudioRecord.getMinBufferSize(sampleRate,android.media.AudioFormat.CHANNEL_CONFIGURATION_MONO,android.media.AudioFormat.ENCODING_PCM_16BIT);
AudioRecord ar = new AudioRecord(AudioSource.MIC,sampleRate,android.media.AudioFormat.CHANNEL_CONFIGURATION_MONO,android.media.AudioFormat.ENCODING_PCM_16BIT,bufferSize);
short[] buffer = new short[bufferSize];

ar.startRecording();
while(isRunning){
    try{
        int numSamples = ar.read(buffer, 0, buffer.length);
        queue.put(new Sample(buffer, numSamples));
    } catch (InterruptedException e){
        e.printStackTrace();
    }
}


//write thread


int sampleRate = 44100;
WaveWriter writer = new WaveWriter("/sdcard","recOut.wav",sampleRate,android.media.AudioFormat.CHANNEL_CONFIGURATION_MONO,android.media.AudioFormat.ENCODING_PCM_16BIT);
try {
    writer.createWaveFile();
} catch (IOException e) {
    e.printStackTrace();
}
while(isRunning){
    try {
        Sample sample = queue.take();
        writer.write(sample.buffer, sample.bufferSize);
    } catch (IOException e) {
        //snip
    }
}

这似乎做工精细，但最终的结果可辨别包含不管我说的，但它是可怕的扭曲。这里有大胆的屏幕顶盖（WMP拒绝播放该文件）。

Which appears to work fine, however the end result recognizably contains whatever I said, but it is horribly distorted. Here's a screen cap of audacity (WMP refuses to play the file).

任何帮助将是很大的AP preciated，让我知道如果你需要更多的code /信息。

Any help would be greatly appreciated, let me know if you need more code / info.

更新

随着马库斯的建议，这是我的更新code：

Following markus's suggestions, here is my updated code:

int sampleRate = 16000;

writer = new WaveWriter("/sdcard","recOut.wav",sampleRate,android.media.AudioFormat.CHANNEL_IN_MONO,android.media.AudioFormat.ENCODING_PCM_16BIT);

int bufferSize = AudioRecord.getMinBufferSize(sampleRate,android.media.AudioFormat.CHANNEL_IN_MONO,android.media.AudioFormat.ENCODING_PCM_16BIT);
AudioRecord ar = new AudioRecord(AudioSource.MIC,sampleRate,android.media.AudioFormat.CHANNEL_IN_MONO,android.media.AudioFormat.ENCODING_PCM_16BIT,bufferSize);

byte[] buffer = new byte[bufferSize]; //all references changed from short to byte type

...而另一个大胆screencap：

...and another audacity screencap:

推荐答案

CHANNEL_CONFIGURATION_MONO是德precated据我所知，使用CHANNEL_IN_MONO。考虑寻找 rehearsalassistant 项目，AFAIK他们使用AudioRecord类也。 samplerates应选择符合标准的采样率就像这个维基百科的文章的解释。

CHANNEL_CONFIGURATION_MONO is deprecated as far as i know, use CHANNEL_IN_MONO. consider looking at rehearsalassistant project, afaik they use AudioRecord class, too. samplerates should be chosen to fit the standard sample rates like explained in this wikipedia article.

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