声道切换主要用到了OpenSL ES中的声道控制接口 SLMuteSoloItf 。

初始化：

 (*pcmPlayerObject)->GetInterface(    
    pcmPlayerObject,
    SL_IID_MUTESOLO,                 
    &pcmPlayPlayerMuteSolo); 
//设置声道： 
(*pcmPlayPlayerMuteSolo)->SetChannelMute(
    pcmPlayPlayerMuteSolo,                 
    1,  //0右声道1左声道                 
    false //声道是否开启                
); 
//立体声：左声道右声道都关闭