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软开转驱动；完全不懂到底alsa驱动开发是开发啥，有没有比较详细的音频alsa驱动开发讲解，看了公司主页也还是不懂；我司用的Mr153系列，但是snd相关的开发是怎么调到sunxi_pcm的；驱动开发到底是开发啥？