你好：
使用tiny4412平板, android系统，通过API打开MIC2音频输入，失败。已经外接了microphone
D/peergine( 9298): 2014-05-16,07:20:33: CPGSysCommon::AudioInputOpen, Mic option. MicNo=2, SampleRate=8000
D/pgnpp ( 9298): pgSysAudioIn.Open, uSampleBits=16, uSampleRate=8000, uPackBytes=640
W/AudioPolicyManagerBase( 107): getInput() could not find device for inputSource 2 // 提示打不开MIC2
E/AudioRecord( 9298): Could not get audio input for record source 2 // 提示打不开MIC2
E/AudioRecord-JNI( 9298): Error creating AudioRecord instance: initialization check failed.
E/AudioRecord-Java( 9298): [ android.media.AudioRecord ] Error code -20 when initializing native AudioRecord object.
D/pgnpp ( 9298): pgSysAudioIn.Open, failed, not inited
请确认此问题怎么解决?
另外，tiny4412只支持8000的采样率吗？
