同时在Android中使用的麦克风在多个应用程序 [英] Use microphone in multiple app simultaneously in Android
问题描述
我们有一个Android设备上,我们想使用麦克风
在同时2应用程序。
We have an Android device on which we would like to use the microphone
in 2 app simultaneously.
事实上,我们有一个在后台运行的语音命令服务(我们使用的是 CMU狮身人面像
库)。的问题是,当我们开始视频记录(摄像机应用),我们不能启动记录,即2的应用程序不能同时访问到麦克风
In fact, we have a vocal command service that is running in the background (we are using the CMU Sphinx
library). The problem is when we start a video recorder (camera application), we can't start the recording as 2 applications can't access to the microphone at the same time.
错误
08-20 12:20:14.601: I/MediaRecorderJNI(7261): prepare: surface=0x59590668
08-20 12:20:15.916: E/MediaRecorder(7261): start failed: -38
08-20 12:20:15.916: E/com.example.CamcorderView(7261): Failed to start recorder.
08-20 12:20:15.916: E/com.example.CamcorderView(7261): java.lang.IllegalStateException
08-20 12:20:15.916: E/com.example.CamcorderView(7261): at android.media.MediaRecorder.start(Native Method)
请注意,相机工作良好,当声带服务处于关闭状态。
Note that the camera works well when the vocal service is off.
此外,我precise,我已经阅读过了这个主题:
Moreover, I precise that I've already read this thread :
<一个href="http://stackoverflow.com/questions/4669047/android-accessing-the-microphone-simultaniously-recognizerintent-own-app">Android:同时放访问麦克风(RecognizerIntent +自己的应用程序)
但这里不同的是,我们有一个手的O / S和内核上。因此,我们如果需要的话可以申请补丁。
but the difference here is that we have a hand on the O/S and the kernel. So we can apply patch if needed.
它是一个 SDK / OS /内核
限制?有没有什么解决办法?
Is it an SDK/OS/Kernel
limitation? Is there any workaround ?
推荐答案
这种情况发生
例如
当你想要录制的电话。 你可以使用开源的通话记录。 看到这和的这个
when you want to record phone call. you can use the open source call recorder. see this and this
下面是一个code样品
Here is a code sample
private MediaRecorder recorder = null;
public void onCreate()
{
super.onCreate();
recorder = new MediaRecorder();
Log.i("CallRecorder", "onCreate created MediaRecorder object");
}
public void onStart(Intent intent, int startId) {
if (isRecording) return;
Context c = getApplicationContext();
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(c);
Boolean shouldRecord = prefs.getBoolean(Preferences.PREF_RECORD_CALLS, false);
if (!shouldRecord) {
Log.i("CallRecord", "RecordService::onStartCommand with PREF_RECORD_CALLS false, not recording");
return;
}
int audiosource = Integer.parseInt(prefs.getString(Preferences.PREF_AUDIO_SOURCE, "1"));
int audioformat = Integer.parseInt(prefs.getString(Preferences.PREF_AUDIO_FORMAT, "1"));
recording = makeOutputFile(prefs);
if (recording == null) {
recorder = null;
return; //return 0;
}
Log.i("CallRecorder", "RecordService will config MediaRecorder with audiosource: " + audiosource + " audioformat: " + audioformat);
try {
// These calls will throw exceptions unless you set the
// android.permission.RECORD_AUDIO permission for your app
recorder.reset();
recorder.setAudioSource(audiosource);
recorder.setOutputFormat(audioformat);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
recorder.setOutputFile(recording.getAbsolutePath());
//recorder.setMaxDuration(msDuration); //1000); // 1 seconds
//recorder.setMaxFileSize(bytesMax); //1024*1024); // 1KB
recorder.setOnInfoListener(this);
recorder.setOnErrorListener(this);
try {
recorder.prepare();
} catch (java.io.IOException e) {
Log.e("CallRecorder", "RecordService::onStart() IOException attempting recorder.prepare()\n");
t.show();
recorder = null;
return;
}
Log.d("CallRecorder", "recorder.prepare() returned");
recorder.start();
isRecording = true;
Log.i("CallRecorder", "recorder.start() returned");
updateNotification(true);
} catch (java.lang.Exception e) {
Log.e("CallRecorder", "RecordService::onStart caught unexpected exception", e);
recorder = null;
}
return;
}
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