TI中文支持网环境：
1、平台：DM8168 evm
2、sdk：DVRRDK_03.00.00.00
3、linux：2.6.37
4、音频芯片：tlv320aic3106
问题描述：
我在做音频采集并实时回放的测试，首先依次打开音频采集、播放，然后将采集后的音频，缓存大于等于1000帧则回放，但是总有Underrun发生或者是直接writei返回资源无效。谢谢！
调试信息如下：
++++++++ Audio_DrvOpen start! ++++++++AUDIO Rate requested 44100Hz, get 44100Hz)
AUDIO CAPTURE: period size = 1000 frames
AUDIO CAPTURE: period time = 22675 us
AUDIO CAPTURE: buffer_size = 16000
++++++++ Audio_DrvOpen end! ++++++++
audio play init start
AUDIO_PLAY >> opened device
AUDIO PLAYBACK: period size = 1000 frames
AUDIO PLAYBACK: period time = 22675 us
AUDIO PLAYBACK: buffer_size = 16000
audio play init end!
AUDIO >> audio play wait…………
Audio_playMain, 238: audio play pcm 174000
hwptr_update: pcmC0D0p:0: pos=36/1000/16000, hwptr=36/0/36/0
hwptr_update: pcmC0D0p:0: pos=337/1000/16000, hwptr=301/36/337/0
hwptr_update: pcmC0D0p:0: pos=662/1000/16000, hwptr=325/337/662/0
hwptr_update: pcmC0D0p:0: pos=979/1000/16000, hwptr=317/662/979/0
hwptr_update: pcmC0D0p:0: pos=1248/1000/16000, hwptr=2/1246/1248/0
hwptr_update: pcmC0D0p:0: pos=1522/1000/16000, hwptr=274/1248/1522/0
hwptr_update: pcmC0D0p:0: pos=1802/1000/16000, hwptr=280/1522/1802/0
hwptr_update: pcmC0D0p:0: pos=2083/1000/16000, hwptr=2/2081/2083/0
hwptr_update: pcmC0D0p:0: pos=2356/1000/16000, hwptr=273/2083/2356/0
hwptr_update: pcmC0D0p:0: pos=2637/1000/16000, hwptr=281/2356/2637/0
hwptr_update: pcmC0D0p:0: pos=2918/1000/16000, hwptr=281/2637/2918/0
hwptr_update: pcmC0D0p:0: pos=3199/1000/16000, hwptr=2/3197/3199/0
hwptr_update: pcmC0D0p:0: pos=3472/1000/16000, hwptr=273/3199/3472/0
hwptr_update: pcmC0D0p:0: pos=3753/1000/16000, hwptr=281/3472/3753/0
hwptr_update: pcmC0D0p:0: pos=4034/1000/16000, hwptr=2/4032/4034/0
hwptr_update: pcmC0D0p:0: pos=4307/1000/16000, hwptr=273/4034/4307/0
hwptr_update: pcmC0D0p:0: pos=4588/1000/16000, hwptr=281/4307/4588/0
hwptr_update: pcmC0D0p:0: pos=4868/1000/16000, hwptr=280/4588/4868/0
hwptr_update: pcmC0D0p:0: pos=5149/1000/16000, hwptr=2/5147/5149/0
hwptr_update: pcmC0D0p:0: pos=5421/1000/16000, hwptr=272/5149/5421/0
hwptr_update: pcmC0D0p:0: pos=5702/1000/16000, hwptr=281/5421/5702/0
AUDIO >> error from writei: Resource temporarily unavailable
AUDIO >> PLAYBACK ERROR <174000 bytes> Resource temporarily unavailable, playback wont continue…
Fabian Zhang：
Hi Ferris：
Please help to check two things：
1. Please make sure the recording and playback bit resolution and sample rate are all the same;
2. It is better to setup ping-pong buffers to achieve glitch-free realtime loopback.
Fabian
ferris：
1、ping-pong buffers 在8168上没有支持。
2、我目前问题主要是回放延时较大（秒级），是否驱动需要优化？
Rocky Chen：
您好
1） 测试的时候，视频是否有打开？如果有，请只运行音频看是否有问题?
2） 看看接受和发送fifo现在设置的是多大，调整一下，看是否有帮助？
