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Editorial Team
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Asked: 2026-05-26T06:28:54+00:00

When ever I run the getMinBufferSize() method in the AudioRecorder Class, the method always

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When ever I run the getMinBufferSize() method in the AudioRecorder Class, the method always returns -2. Even when I change the sample rate, the encoding method, and the channel number. I have tried every combination possible, but it still returns -2. I know that the permissions are there for RecordAudio. If I comment out the line for the getMinBufferSize, and make the minBuffer 4096, the Audio recorder will initialize and record. This will only work when I have the sample rate set to 8000, and the recordings sound like trash. If I change the sample rate at all, the program will force close.

Edit: 

bufferSize = AudioRecord.getMinBufferSize(8000,AudioFormat.CHANNEL_CONFIGURATION_DEFAULT,ENCODING_PCM_16BIT);

I am running this on the emulator, a Droid Eris, Droid 1, and Droid 2 Global

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1 Answer

  1. Editorial Team

    Looking at the code for AudioRecord.java, there’s really only 3 possibilities here:

    • Your channelConfig is invalid.
    • You’re not using AudioFormat.ENCODING_PCM_16BIT. (8 bit’s isn’t supported right now.)
    • The hardware doesn’t support what you’re asking it to record.

    Source: http://google.com/codesearch/p?hl=en#uX1GffpyOZk/media/java/android/media/AudioRecord.java

    See also: Why does AudioRecord.getMinBufferSize return ERROR_BAD_VALUE (-2)?

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