Java AudioRecord.read方法代碼示例

import android.media.AudioRecord; //導入方法依賴的package包/類
private int read(AudioRecord recorder) {
	int numberOfBytes = recorder.read(mBuffer, 0, mBuffer.length); // Fill buffer

	// Some error checking
	if (numberOfBytes == AudioRecord.ERROR_INVALID_OPERATION) {
		Log.e(LOG_TAG, "The AudioRecord object was not properly initialized");
		return -1;
	} else if (numberOfBytes == AudioRecord.ERROR_BAD_VALUE) {
		Log.e(LOG_TAG, "The parameters do not resolve to valid data and indexes.");
		return -2;
	} else if (numberOfBytes > mBuffer.length) {
		Log.e(LOG_TAG, "Read more bytes than is buffer length:" + numberOfBytes + ": " + mBuffer.length);
		return -3;
	} else if (numberOfBytes == 0) {
		Log.e(LOG_TAG, "Read zero bytes");
		return -4;
	}
	// Everything seems to be OK, adding the buffer to the recording.
	add(mBuffer);
	return 0;
}
 

import android.media.AudioRecord; //導入方法依賴的package包/類
@Override
public void run() {
    byte[] buffer = new byte[audioBufferSize];
    recorder = new AudioRecord(audioSource, sampleRate, channel, audioFormat, audioBufferSize);
    try {
        while (recorder.getState() != AudioRecord.STATE_INITIALIZED)
            Thread.sleep(100, 0);
    } catch (InterruptedException e) {
        recorder.release();
        return;
    }

    recorder.startRecording();
    for (; ; ) {
        int length = recorder.read(buffer, 0, buffer.length);
        if (length < 0)
            Log.e("Record", "error: " + Integer.toString(length));
        else {
            for (WebSocket ws : wss)
                ws.sendBinary(buffer);
        }
        if (Thread.interrupted()) {
            recorder.stop();
            return;
        }
    }
}
 

import android.media.AudioRecord; //導入方法依賴的package包/類
public void StartRecord() {
        Log.i(TAG,"開始錄音");
        isRecording=true;

//生成PCM文件
        File file = audioFile;//new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/reverseme.pcm");
        Log.i(TAG,"生成文件");
//如果存在，就先刪除再創建
        if (file.exists())
            file.delete();
        Log.i(TAG,"刪除文件");
        try {
            file.createNewFile();
            Log.i(TAG,"創建文件");
        } catch (IOException e) {
            Log.i(TAG,"未能創建");
            throw new IllegalStateException("未能創建" + file.toString());
        }
        try {
//輸出流
            OutputStream os = new FileOutputStream(file);
            BufferedOutputStream bos = new BufferedOutputStream(os);
            DataOutputStream dos = new DataOutputStream(bos);
            int bufferSize = AudioRecord.getMinBufferSize(frequency, channelConfiguration, audioEncoding);
            AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency, channelConfiguration, audioEncoding, bufferSize);
            byte[] buffer = new byte[bufferSize];
            audioRecord.startRecording();
            Log.i(TAG, "開始錄音");
            isRecording = true;
            while (isRecording) {
                int bufferReadResult = audioRecord.read(buffer, 0, bufferSize);
                dos.write(buffer,0,bufferReadResult);
            }
            audioRecord.stop();
            dos.close();
        } catch (Throwable t) {
            Log.e(TAG, "錄音失敗");
        }
    }
 

import android.media.AudioRecord; //導入方法依賴的package包/類
private void handleCodecInput(AudioRecord audioRecord, byte[] audioRecordData,
                              MediaCodec mediaCodec, ByteBuffer[] codecInputBuffers,
                              boolean running)
{
  int length                = audioRecord.read(audioRecordData, 0, audioRecordData.length);
  int codecInputBufferIndex = mediaCodec.dequeueInputBuffer(10 * 1000);

  if (codecInputBufferIndex >= 0) {
    ByteBuffer codecBuffer = codecInputBuffers[codecInputBufferIndex];
    codecBuffer.clear();
    codecBuffer.put(audioRecordData);
    mediaCodec.queueInputBuffer(codecInputBufferIndex, 0, length, 0, running ? 0 : MediaCodec.BUFFER_FLAG_END_OF_STREAM);
  }
}