我有一个蓝牙耳机(它可以播放立体声音乐)连接到我的Android手机(Android 4.4.3)。现在我希望我的代码能够以高采样率(44100)播放立体声音乐并从该耳机录制音频。我按照以下帖子中的解决方案。
How to record sound using bluetooth headset
Capture Audio through Bluetooth Headset paired with Android Device
我的基本代码如下所示。
权限:
m_amAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
public void turnOnBluetooth() {
final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
int state = intent.getIntExtra(AudioManager.EXTRA_SCO_AUDIO_STATE, -1);
if (AudioManager.SCO_AUDIO_STATE_CONNECTED == state) {
System.err.println("bluetooth connected");
unregisterReceiver(this);
} else if (AudioManager.SCO_AUDIO_STATE_DISCONNECTED == state) {
System.err.println("bluetooth disconnected");
}
}
};
registerReceiver(broadcastReceiver, new IntentFilter(
AudioManager.ACTION_SCO_AUDIO_STATE_UPDATED));
try {
if (m_amAudioManager.isBluetoothScoAvailableOffCall()) {
if (m_amAudioManager.isBluetoothScoOn()) {
m_amAudioManager.stopBluetoothSco();
m_amAudioManager.startBluetoothSco();
System.err.println("Bluetooth SCO On!");
} else {
System.err.println("Bluetooth Sco Off!");
m_amAudioManager.startBluetoothSco();
}
} else {
System.err.println("Bluetooth SCO not available");
}
} catch (Exception e) {
System.err.println("sco elsepart startBluetoothSCO " + e);
unregisterReceiver(broadcastReceiver);
}
}
开启蓝牙Sco的代码:
public void playMusic(){
this.mediaPlayer = new MediaPlayer();
this.mediaPlayer
.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mp.release();
}
});
this.mediaPlayer.setDataSource(Environment.getExternalStorageDirectory().
getAbsolutePath()+ "/"+ folderName + "/stereo.wav");
// change type to STREAM_VOICE_CALL can partly solve the problem
// but reduces the quality of the music, which is critical in my case
this.mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
this.mediaPlayer.prepare();
this.mediaPlayer.start();
}
播放立体声音乐的代码:
public void recordAudio() {
AudioRecorder recorder = new AudioRecord(
audioSource, // MediaRecorder.AudioSource.MIC
RECORDER_SAMPLERATE, // 44100
RECORDER_CHANNELS, // AudioFormat.CHANNEL_IN_MONO
RECORDER_AUDIO_ENCODING, // AudioFormat.ENCODING_PCM_16BIT
bufferSize // obtained by AudioRecord.getMinBufferSize()
);
int i = recorder.getState();
if (i == 1)
recorder.startRecording();
// then read bytes from the recorder
}
录制音频的代码:
turnOnBluetooth();
playMusic();
recordAudio();
这是怎么回事。
案例1:如果我调用以下序列
playMusic();
recordAudio();
音乐通过手机的扬声器而不是蓝牙耳机播放。录音机可以录制来自蓝牙耳机麦克风的声音,但采样率非常低(8kHz)。
案例2:如果我不调用turnOnBluetooth(),即执行以下序列
m_amAudioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
音乐现在通过蓝牙耳机播放,但录音机只能录制手机内置麦克风的音频。
我还尝试通过
更改AudioManager的模式m_amAudioManager.setSpeakerphoneOn(false);
m_amAudioManager.setBluetoothScoOn(true);
并按
设置音频路线m_amAudioManager.setBluetoothScoOn(false);
结果与案例1相同。如果我设置
<script type="text/javascript">
require(["dojo/ready","dojo/dom","dojo/dom-attr"], function(ready,dom,domAttr){
ready(function(){
var Geo = {};
if (navigator.geolocation){
navigator.geolocation.getCurrentPosition(success, error);
}else{
}
function success(position) {
Geo.lat = position.coords.latitude;
Geo.lng = position.coords.longitude;
populateHeader(Geo.lat, Geo.lng);
}
function error() {
console.log("Geocoder failed");
domAttr.set(dom.byId("criteria_postcode"),"required",true);
}
function populateHeader(lat, lng) {
dom.byId("criteria_latitude").value=Number(lat);
dom.byId("criteria_longitude").value=Number(lng);
}
});
});
</script>
重复案例2.
我已经为此工作了几天,上面的行为让我很困惑。我在音频设置中遗漏了什么吗?或者我需要使用蓝牙耳机设置进行更复杂的控制?感谢您阅读本文,欢迎任何建议。谢谢!
答案 0 :(得分:0)
这可能为时已晚,但这是我的解决方法。
您需要按照以下步骤设置mediarecorder
mediaRecorder = new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_2_TS);
mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
mediaRecorder.setOutputFile(AudioSavePathInDevice);
要在蓝牙耳机上播放,您需要打开蓝牙并关闭扬声器
audioManager.setBluetoothScoOn(true);
audioManager.startBluetoothSco();
audioManager.setSpeakerphoneOn(false);
audioManager.setMode(audioManager.MODE_NORMAL);
要以8KHz的其他频率进行录制,则需要使用AudioRecorder类
new AudioRecord(MediaRecorder.AudioSource.MIC, 8000, AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT, audioBufferSize);