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[英]How to record audio using getUserMedia and Web Audio API on Chrome for Android?
[英]How to record audio using audio api in Android?
我有一個版本為2.3.3的LG Android手機。 我需要連接耳機插孔中的麥克風,因為我想創建一個讀取聲音樣本的應用程序。
如何以編程方式讀取樣本?
如果您真的想閱讀AudioSamples,我建議您使用AudioRecord而不是MediaRecorder,因為它可以讓您更好地控制AudioSamples ...為此您可以使用以下代碼,AudioCapturer是我的包裝類,我用它來獲取樣本AudioRecord object..IAudioReceiver是一個具有處理音頻數據的方法的接口。
public class AudioCapturer implements Runnable {
private AudioRecord audioRecorder = null;
private int bufferSize;
private int samplePerSec = 16000;
private String LOG_TAG = "AudioCapturer";
private Thread thread = null;
private boolean isRecording;
private static AudioCapturer audioCapturer;
private IAudioReceiver iAudioReceiver;
private AudioCapturer(IAudioReceiver audioReceiver) {
this.iAudioReceiver = audioReceiver;
}
public static AudioCapturer getInstance(IAudioReceiver audioReceiver) {
if (audioCapturer == null) {
audioCapturer = new AudioCapturer(audioReceiver);
}
return audioCapturer;
}
public void start() {
bufferSize = AudioRecord.getMinBufferSize(samplePerSec, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
if (bufferSize != AudioRecord.ERROR_BAD_VALUE && bufferSize != AudioRecord.ERROR) {
audioRecorder = new AudioRecord(MediaRecorder.AudioSource.DEFAULT, this.samplePerSec, AudioFormat.CHANNEL_IN_MONO,
AudioFormat.ENCODING_PCM_16BIT, this.bufferSize * 10); // bufferSize
// 10x
if (audioRecorder != null && audioRecorder.getState() == AudioRecord.STATE_INITIALIZED) {
Log.i(LOG_TAG, "Audio Recorder created");
audioRecorder.startRecording();
isRecording = true;
thread = new Thread(this);
thread.start();
} else {
Log.e(LOG_TAG, "Unable to create AudioRecord instance");
}
} else {
Log.e(LOG_TAG, "Unable to get minimum buffer size");
}
}
public void stop() {
isRecording = false;
if (audioRecorder != null) {
if (audioRecorder.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING) {
// System.out
// .println("Stopping the recorder inside AudioRecorder");
audioRecorder.stop();
}
if (audioRecorder.getState() == AudioRecord.STATE_INITIALIZED) {
audioRecorder.release();
}
}
}
public boolean isRecording() {
return (audioRecorder != null) ? (audioRecorder.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING) : false;
}
@Override
public void run() {
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
while (isRecording && audioRecorder.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING) {
short[] tempBuf = new short[Constants.FRAME_SIZE / 2];
audioRecorder.read(tempBuf, 0, tempBuf.length);
iAudioReceiver.capturedAudioReceived(tempBuf, false);
}
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#finalize()
*/
@Override
protected void finalize() throws Throwable {
super.finalize();
System.out.println("AudioCapturer finalizer");
if (audioRecorder != null && audioRecorder.getState() == AudioRecord.STATE_INITIALIZED) {
audioRecorder.stop();
audioRecorder.release();
}
audioRecorder = null;
iAudioReceiver = null;
thread = null;
}
}
現在你可以在你的程序的Main類中使用這個類的對象,它將開始為你提供音頻樣本,你可以在你的IAudioReceiver(使用這些樣本的類)中處理它們。
如果您仍想使用MediaRecorder, 此鏈接對您有用,
2)我如何以編程方式閱讀樣本?
據我所知,在Android中你可以使用以下兩個類之一錄制音頻:
用於錄制音頻和視頻。 錄制控制基於簡單的狀態機
AudioRecord類管理Java應用程序的音頻資源,以記錄來自平台的音頻輸入硬件的音頻。 這是通過從AudioRecord對象“拉”(讀取)數據來實現的。 應用程序負責使用以下三種方法之一及時輪詢AudioRecord對象:read(byte [],int,int),read(short [],int,int)或read(ByteBuffer,int)。 選擇使用哪種方法將基於對AudioRecord用戶最方便的音頻數據存儲格式。
Ps:按照上面的鏈接閱讀並理解最符合您需求的鏈接。
1)你推薦哪款麥克風?
正如我在你的問題上的評論中所提到的,這在stackoverflow上的主題 ,但為了完整性的目的:
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