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//16bit PCM 数据
if(0 > snd_pcm_hw_params_set_format(playback_handle, hw_params, SND_PCM_FORMAT_U16_LE))
{
	printf("snd_pcm_hw_params_set_format err\n");
	return -1;
}

//单声道 非立体声
if(0 > snd_pcm_hw_params_set_channels(playback_handle, hw_params, 1))
{
	printf("snd_pcm_hw_params_set_channels err\n");
	return -1;
}

void nes_apu_fill_buffer(int samples,u16* wavebuf)
{	
 	//audio_pcm_play((unsigned char*)wavebuf,APU_PCMBUF_SIZE*2);
	
#if 1
	int ret;
	ret = snd_pcm_writei(playback_handle, (u8*)wavebuf, samples);
#endif
}