一、遇到问题
- 使用RK3399的开发板，跑Android8.1系统
- 一开始插上外置的USB麦克风的时候，无法使用
二、分析问题
- 查看USB麦克风拔插过程的debug打印日志
- 插入USB麦克风后，adb 查询当前声卡信息
cat cards
三、解决问题
- 通过分析发现，USB麦克风设备没有枚举出来，节点都没挂载上去
- 这时候就怀疑是硬件问题，
USB麦克风设备故障，或者USB供电不足，或者USB布线问题 - 通过交叉实验，
拔插不同的USB口，更换RK3399开发板，更换USB麦克风 - 最后确认是
USB麦克风设备故障，更换USB麦克风后，再cat cards就能查询出USB-AUDIO设备
文章来源：https://www.toymoban.com/news/detail-490521.html
- 使用USB麦克风设备
- 首先需要正常识别到该USB-AUDIO设备
- 其次Android系统会自动切换MIC录音源
- 如果没有插入USB麦克风设备，则Android系统使用主板上模拟MIC
- 如果插入USB麦克风设备，则Android系统就会切换到USB麦克风
四、录音源码分析
-
audioSource: MediaRecorder.AudioSource.CAMCORDER, MediaRecorder.AudioSource.MIC 等 -
sampleRateInHz: 常用的有: 8000,11025,16000,22050,44100,96000；44100Hz是唯一可以保证兼容所有Android手机的采样率 -
channelConfig:AudioFormat.CHANNEL_CONFIGURATION_DEFAULT，常用的是CHANNEL_IN_MONO（单通道）CHANNEL_IN_STEREO（双通道） -
audioFormat: AudioFormat.ENCODING_PCM_16BIT, 测试中要捕获PCM数据 -
bufferSizeInBytes: 由AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat)获得
public AudioRecord(int audioSource, int sampleRateInHz, int channelConfig, int audioFormat, int bufferSizeInBytes)
AudioRecord.startRecording();
AudioRecord.stop();
AudioRecord.read(byte[] audioData, int offsetInBytes, int sizeInBytes);
public class AudioCapturer {
private static final String TAG = "AudioCapturer";
private static final int DEFAULT_SOURCE = MediaRecorder.AudioSource.MIC;
private static final int DEFAULT_SAMPLE_RATE = 44100;
private static final int DEFAULT_CHANNEL_CONFIG = AudioFormat.CHANNEL_IN_STEREO;
private static final int DEFAULT_AUDIO_FORMAT = AudioFormat.ENCODING_PCM_16BIT;
private AudioRecord mAudioRecord;
private int mMinBufferSize = 0;
private Thread mCaptureThread;
private boolean mIsCaptureStarted = false;
private volatile boolean mIsLoopExit = false;
private OnAudioFrameCapturedListener mAudioFrameCapturedListener;
public interface OnAudioFrameCapturedListener {
public void onAudioFrameCaptured(byte[] audioData);
}
public boolean isCaptureStarted() {
return mIsCaptureStarted;
}
public void setOnAudioFrameCapturedListener(OnAudioFrameCapturedListener listener) {
mAudioFrameCapturedListener = listener;
}
public boolean startCapture() {
return startCapture(DEFAULT_SOURCE, DEFAULT_SAMPLE_RATE, DEFAULT_CHANNEL_CONFIG,
DEFAULT_AUDIO_FORMAT);
}
public boolean startCapture(int audioSource, int sampleRateInHz, int channelConfig, int audioFormat) {
if (mIsCaptureStarted) {
Log.e(TAG, "Capture already started !");
return false;
}
mMinBufferSize = AudioRecord.getMinBufferSize(sampleRateInHz,channelConfig,audioFormat);
if (mMinBufferSize == AudioRecord.ERROR_BAD_VALUE) {
Log.e(TAG, "Invalid parameter !");
return false;
}
Log.d(TAG , "getMinBufferSize = "+mMinBufferSize+" bytes !");
mAudioRecord = new AudioRecord(audioSource,sampleRateInHz,channelConfig,audioFormat,mMinBufferSize);
if (mAudioRecord.getState() == AudioRecord.STATE_UNINITIALIZED) {
Log.e(TAG, "AudioRecord initialize fail !");
return false;
}
mAudioRecord.startRecording();
mIsLoopExit = false;
mCaptureThread = new Thread(new AudioCaptureRunnable());
mCaptureThread.start();
mIsCaptureStarted = true;
Log.d(TAG, "Start audio capture success !");
return true;
}
public void stopCapture() {
if (!mIsCaptureStarted) {
return;
}
mIsLoopExit = true;
try {
mCaptureThread.interrupt();
mCaptureThread.join(1000);
}
catch (InterruptedException e) {
e.printStackTrace();
}
if (mAudioRecord.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING) {
mAudioRecord.stop();
}
mAudioRecord.release();
mIsCaptureStarted = false;
mAudioFrameCapturedListener = null;
Log.d(TAG, "Stop audio capture success !");
}
private class AudioCaptureRunnable implements Runnable {
@Override
public void run() {
while (!mIsLoopExit) {
byte[] buffer = new byte[mMinBufferSize];
int ret = mAudioRecord.read(buffer, 0, mMinBufferSize);
if (ret == AudioRecord.ERROR_INVALID_OPERATION) {
Log.e(TAG , "Error ERROR_INVALID_OPERATION");
}
else if (ret == AudioRecord.ERROR_BAD_VALUE) {
Log.e(TAG , "Error ERROR_BAD_VALUE");
}
else {
if (mAudioFrameCapturedListener != null) {
mAudioFrameCapturedListener.onAudioFrameCaptured(buffer);
}
Log.d(TAG , "OK, Captured "+ret+" bytes !");
}
SystemClock.sleep(10);
}
}
}
}
五、播放源码分析
-
streamType:-
AudioManager.STREAM_VOCIE_CALL：电话声音 -
AudioManager.STREAM_SYSTEM：系统声音 -
AudioManager.STREAM_RING：铃声 -
AudioManager.STREAM_MUSCI：音乐声 -
AudioManager.STREAM_ALARM：警告声 -
AudioManager.STREAM_NOTIFICATION：通知声
-
-
sampleRateInHz: 常用的有: 8000,11025,16000,22050,44100,96000；44100Hz是唯一可以保证兼容所有Android手机的采样率 -
channelConfig:AudioFormat.CHANNEL_CONFIGURATION_DEFAULT，常用的是CHANNEL_IN_MONO（单通道） -
audioFormat: AudioFormat.ENCODING_PCM_16BIT, 测试中要捕获PCM数据 -
bufferSizeInBytes: 由AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat)获得 -
mode:-
AudioTrack.MODE_STATIC，一次性将所有的数据都写入播放缓冲区，简单高效 -
AudioTrack.MODE_STREAM，按照一定的时间间隔不间断地写入音频数据
-
public AudioTrack(int streamType, int sampleRateInHz, int channelConfig, int audioFormat, int bufferSizeInBytes, int mode)
AudioTrack.play();
AudioTrack.stop();
import android.util.Log;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
public class AudioPlayer {
private static final String TAG = "AudioPlayer";
private static final int DEFAULT_STREAM_TYPE = AudioManager.STREAM_MUSIC;
private static final int DEFAULT_SAMPLE_RATE = 44100;
private static final int DEFAULT_CHANNEL_CONFIG = AudioFormat.CHANNEL_IN_STEREO;
private static final int DEFAULT_AUDIO_FORMAT = AudioFormat.ENCODING_PCM_16BIT;
private static final int DEFAULT_PLAY_MODE = AudioTrack.MODE_STREAM;
private boolean mIsPlayStarted = false;
private int mMinBufferSize = 0;
private AudioTrack mAudioTrack;
public boolean startPlayer() {
return startPlayer(DEFAULT_STREAM_TYPE,DEFAULT_SAMPLE_RATE,DEFAULT_CHANNEL_CONFIG,DEFAULT_AUDIO_FORMAT);
}
public boolean startPlayer(int streamType, int sampleRateInHz, int channelConfig, int audioFormat) {
if (mIsPlayStarted) {
Log.e(TAG, "Player already started !");
return false;
}
mMinBufferSize = AudioTrack.getMinBufferSize(sampleRateInHz,channelConfig,audioFormat);
if (mMinBufferSize == AudioTrack.ERROR_BAD_VALUE) {
Log.e(TAG, "Invalid parameter !");
return false;
}
Log.d(TAG , "getMinBufferSize = "+mMinBufferSize+" bytes !");
mAudioTrack = new AudioTrack(streamType,sampleRateInHz,channelConfig,audioFormat,mMinBufferSize,DEFAULT_PLAY_MODE);
if (mAudioTrack.getState() == AudioTrack.STATE_UNINITIALIZED) {
Log.e(TAG, "AudioTrack initialize fail !");
return false;
}
mIsPlayStarted = true;
Log.d(TAG, "Start audio player success !");
return true;
}
public int getMinBufferSize() {
return mMinBufferSize;
}
public void stopPlayer() {
if (!mIsPlayStarted) {
return;
}
if (mAudioTrack.getPlayState() == AudioTrack.PLAYSTATE_PLAYING) {
mAudioTrack.stop();
}
mAudioTrack.release();
mIsPlayStarted = false;
Log.d(TAG, "Stop audio player success !");
}
public boolean play(byte[] audioData, int offsetInBytes, int sizeInBytes) {
if (!mIsPlayStarted) {
Log.e(TAG, "Player not started !");
return false;
}
if (sizeInBytes < mMinBufferSize) {
Log.e(TAG, "audio data is not enough !");
return false;
}
if (mAudioTrack.write(audioData,offsetInBytes,sizeInBytes) != sizeInBytes) {
Log.e(TAG, "Could not write all the samples to the audio device !");
}
mAudioTrack.play();
Log.d(TAG , "OK, Played "+sizeInBytes+" bytes !");
return true;
}
}
六、参考
- Jhuster/Android
- android 采集PCM音频数据并播放(支持USB摄像头MIC)
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