简单描述android audio HAL层的调用流程，好记性不如好笔头！
1.Enable device before playback:
AudioHardware::setParameters
2.Start playback:
AudioHardware::openOutputStream
3.Playbacking...:
AudioStreamOutALSA::write
.
.
.
AudioStreamOutALSA::write
4.Disable device after playback:
AudioHardware::setParameters
5.Stop playback：
AudioHardware::closeOutputStream
kernel driver的调用流程及硬件控制时需以后再补吧，先做个小记！
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