可以用如下方法: 
修改AudioYusuStreamOut.cpp,添加方法: 
 
void AudioYusuStreamOut::swS2M(const void* buffer, size_t bytes) 
{ 
uint32 Idx_i; 
int16 PCM_M; 
short* pbuffer=(short*)buffer; 
{ 
//enable software stereo to mono 
for(Idx_i = 0; Idx_i<bytes>>1; Idx_i+=2) 
{ 
PCM_M = pbuffer[Idx_i+1]; 
pbuffer[Idx_i+1]=pbuffer[Idx_i]; 
pbuffer[Idx_i]=PCM_M; 
} 
} 
} 
 修改ssize_t AudioYusuStreamOut::write(const void* buffer, size_t bytes) 
在dumpPcmData(streamout_ori,outbuffer,bytes,streamout_ori_propty); 
之前添加: swS2M(buffer,bytes);