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Linux ALSA驱动之三：PCM创建流程源码分析（基于Linux 5.18）下3、PCM相关源码分析3.1、snd_pcm_new/** * snd_pcm_new - create a new PCM instance * @card: the card instance * @id: the...

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Linux ALSA驱动之三：PCM创建流程源码分析（基于Linux 5.18）上1、基本概念及逻辑关系如上图，通过上一节声卡的学习我们已经知道PCM是声卡的一个子设备，或者表示一个PCM实例。每个声卡最多可以包含4个pcm的实例，每个pcm实例对应一个pcm设备文件。pcm实例数量的这种限制源于l...

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