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POHow to stop sound input and output from changing to internal when recording audio in Android?
 

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  1. POHow to stop sound input and output from changing to internal when recording audio in Android?
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    <p>I've got a strange bug in my audio recording app that causes the device to switch to internal audio when I call <code>AudioRecord.startRecording();</code> Meaning, all audio from every app (music players, YouTube, etc.) gets forced through the speakers from that point on and recording is made from the internal microphone, even if a headset with a microphone is plugged in. </p> <p>The only way to allow the headset to work again is to exit the app and adjust the phone volume, which seems to cause the device to realize it's got a headset again.</p> <p>My question is whether anyone can tell me what I might be doing to cause the forced switch to the speakers? Or is it maybe just a problem with the device/rom I'm using to test?</p> <p>Here is the call that causes the switch:</p> <pre><code> AudioRecord record = openAudio(); record.startRecording(); </code></pre> <p>...</p> <pre><code> private AudioRecord openAudio() { int samplingRate = Integer.parseInt(prefs.getString("sample_rate", "44100")); int min = AudioRecord.getMinBufferSize(samplingRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT); Log.d("Recorder", "Min buffer size: " + min); Log.d("Recorder", "Sampling Rate: " + samplingRate); if (min &lt; 4096) min = 4096; AudioRecord record = new AudioRecord(MediaRecorder.AudioSource.DEFAULT, samplingRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, min); if (record.getState() == AudioRecord.STATE_INITIALIZED) { </code></pre> <p>// Log.d("Recorder", "Audio recorder initialised at " + record.getSampleRate()); return record; } record.release(); record = null; return null; }</p> <p>and here is the full app if anyone is interested in testing on their device:</p> <p><a href="https://play.google.com/store/apps/details?id=org.yuttadhammo.androidwave" rel="nofollow">https://play.google.com/store/apps/details?id=org.yuttadhammo.androidwave</a></p> <p><a href="https://github.com/yuttadhammo/androidwave" rel="nofollow">https://github.com/yuttadhammo/androidwave</a></p> <p>UPDATE: The same behaviour occurs in Rehearsal Assistant as well, but only if I have it record uncompressed audio. It seems that the problem has something to do with recording uncompressed audio. Any ideas why?</p>
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    1. USyuttadhammo
    1. USyuttadhammo
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    1. COOn which device(s) does this happen? I don't recognize the behaviour you describe from any devices I've worked on?
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      1. POHow to stop sound input and output from changing to internal when recording audio in Android?
      1. USMichael
    2. COit's happening on Huawei MediaPad running CM 10.1 - I guess it might be a rom issue. Playing wav files doesn't cause problems, though.
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      1. POHow to stop sound input and output from changing to internal when recording audio in Android?
      1. USyuttadhammo
 

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