我今天检查并尝试了所有其他线程多个小时,但没有一个解决方案有效。
我尝试过滤所有可用的音频选项。我已经为该应用程序提供了适当的权限。
目标:我正在尝试获取此音频流,以便我可以获得音频的频率。
我的东西
public int audioSource = MediaRecorder.AudioSource.MIC;
public int channelConfig = AudioFormat.CHANNEL_IN_MONO;
public int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
public AudioRecord audioRecord = null;
private Thread recordingThread = null;
public int blockSize = 256; // deal with this many samples at a time
public int sampleRate = 8000; // Sample rate in Hz
稍后......
int bufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioEncoding);
AudioRecord audioeeeeRecord = new AudioRecord(audioSource, sampleRate, channelConfig, audioEncoding, bufferSize); // The RAW PCM sample recording
audioRecord = audioeeeeRecord;
if (audioRecord != null && audioRecord.getState() != AudioRecord.STATE_INITIALIZED)
try {
throw new Exception("AudioRecord init failed"); //audioRecord = findAudioRecord();
} catch (Exception e) {
e.printStackTrace();
}
final short[] buffer = new short[blockSize];
try {
audioRecord.startRecording();
} catch (Exception e) {
e.printStackTrace();
}
这会引发以下错误(http://pastebin.com/raw/3wmA4cku):
AudioRecord: AudioFlinger could not create record track, status: -1
E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -1.
E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
W/System.err: java.lang.Exception: AudioRecord init failed
W/System.err: at app.mobile.mobileecg.MainActivity.startReading(MainActivity.java:102)
W/System.err: at app.mobile.mobileecg.MainActivity$1.onClick(MainActivity.java:58)
W/System.err: at android.view.View.performClick(View.java:5697)
W/System.err: at android.view.View$PerformClick.run(View.java:22526)
W/System.err: at android.os.Handler.handleCallback(Handler.java:739)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
W/System.err: at android.os.Looper.loop(Looper.java:158)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:7229)
W/System.err: at java.lang.reflect.Method.invoke(Native Method)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
W/System.err: java.lang.IllegalStateException: startRecording() called on an uninitialized AudioRecord.
W/System.err: at android.media.AudioRecord.startRecording(AudioRecord.java:943)
W/System.err: at app.mobile.mobileecg.MainActivity.startReading(MainActivity.java:114)
W/System.err: at app.mobile.mobileecg.MainActivity$1.onClick(MainActivity.java:58)
W/System.err: at android.view.View.performClick(View.java:5697)
W/System.err: at android.view.View$PerformClick.run(View.java:22526)
W/System.err: at android.os.Handler.handleCallback(Handler.java:739)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
W/System.err: at android.os.Looper.loop(Looper.java:158)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:7229)
W/System.err: at java.lang.reflect.Method.invoke(Native Method)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
答案 0 :(得分:4)
步骤1)检查清单以确保在应用程序部分下添加RECORD_AUDIO权限。 e.g。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.colibri.audioloopback">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.RECORD_AUDIO" />
</manifest>
步骤2)如果您的设备为M或更高版本,则需要通过“设置” - >“应用” - >“您的应用” - >“权限”授予权限。
步骤3)如果仍然无效,请参阅下面的代码段。
public void audioRecordLoop() throws Exception {
Log.e(TAG,"start audioRecordLoop");
int channelConfig = mChannels == 2?
AudioFormat.CHANNEL_IN_STEREO:
AudioFormat.CHANNEL_IN_MONO;
int bufferSize = AudioRecord.getMinBufferSize(
mSampleRateHz, channelConfig, mAudioEncoding);
mAudioRecord = new AudioRecord(
mAudioSource, mSampleRateHz, channelConfig, mAudioEncoding, bufferSize);// The RAW PCM sample recording
if (mAudioRecord.getState() != AudioRecord.STATE_INITIALIZED) {
Log.e(TAG,"AudioRecord init failed");
return;
}
final short[] buffer = new short[mBlockSize];
mAudioRecord.startRecording();
int len = 0;
while (mbExit == false) {
len = mAudioRecord.read(buffer, 0, mBlockSize);
if (len < 0) {
Log.e(TAG,"read error " + len);
return;
}
}
mAudioRecord.stop();
mAudioRecord.release();
}
现在应该可以使用了!
答案 1 :(得分:1)
我认为问题可能是您将音频资源与之前的尝试捆绑在一起,然后得到了正确的代码,现在它不起作用,因为没有可用的音频资源。见this SO question。此外,当构造函数返回未初始化的AudioRecord时,您抛出一个异常,但是您捕获了自己的异常,这导致日志中的第二个异常(...在未初始化的AudioRecord上调用...),可以忽略它,因为它是第一个结果。
您可能需要在活动中放置一些try / finally部分和/或OnDestroy和/或OnPause方法,以确保在不再使用时释放audioRecord。
准备好清理代码后,您可能需要终止应用和/或重新启动手机以释放音频资源。
当然有可能你还有另一个正在运行的应用程序正在拿着麦克风,但我对此表示怀疑。
答案 2 :(得分:1)
这就是答案。愚蠢的是,这不是Android所拥有的。
https://stackoverflow.com/a/33769527/6530367
I know this is a very old question but in Android Marshmallow you have to go on "Settings > Apps > Your App > Permissions" and enble Microphone permission.