Android AudioTrack cannot be INITIALIZED

I have a problem with initializing android AudioTrack. I have Nexus One with android 2.3.3.

Here is my code:

int _rate = AudioTrack.getNativeOutputSampleRate(AudioManager.STREAM_SYSTEM);

int buffersize = AudioRecord.getMinBufferSize(_rate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);

AudioTrack atrack = new AudioTrack(AudioManager.STREAM_VOICE_CALL, _rate, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize, AudioTrack.MODE_STREAM);

if (atrack.getState() == AudioTrack.STATE_UNINITIALIZED) ...

So the state of the atrack is always AudioTrack.STATE_UNINITIALIZED

The application manifest is

<application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name="BigLeftEarActivity"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

&开发者_StackOverflowlt;/application>

<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"></uses-permission>
<uses-permission android:name="android.permission.BLUETOOTH"></uses-permission>
<uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>

<uses-sdk android:minSdkVersion="10" /> 

Could you help me? What could be wrong?

Thanks!

I found a solution:

After line

int buffersize = AudioRecord.getMinBufferSize(_rate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);

I added

buffersize *= 2;

and audio track was initialized.

This is not a perfect solution. Maybe it would be enough to add just one byte to the buffer, but it works.

"Feci quod potui, faciant meliora potentes Feci quod potui, faciant meliora potentes."

I think I found your issue:

You are using the AudioRecord.getMinBufferSize() for an AudioTrack. You should use the AudioTrack.getMinBUfferSize() instead, this should give you the appropriate value.

mAudioRecBufferSize = AudioRecord.getMinBufferSize(44100, AudioFormat.CHANNEL_IN_MONO , AudioFormat.ENCODING_PCM_16BIT);

mAudioPlayBufferSize = AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_OUT_MONO , AudioFormat.ENCODING_PCM_16BIT);