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AM3505在Alsa里面做音频数据还回测试,时间延时很大,为什么

Other Parts Discussed in Thread: AM3505

最近在用AM3505做音频voip开发,单个板卡音频还回测试时发现音频延时时间很长。做了如下测试:

1.直接在音频编解码芯片AIC23b上的I2S总线上做数据收发还回(即将DX和DR管脚短接),音频输入输出延时几乎没有;

2.然后在Alsa里面做音频数据还回测试,时间延时很大,大概在180ms左右;

所以我很疑惑,为什么延时会这么大??跟什么有关系?