https://blog.csdn.net/zyuanyun/article/details/59170418 https://blog.csdn.net/whshiyun/article/details/80889838 ALSA Asoc框架如下图: Asoc分为machine ...
https: www.kernel.org doc html v . sound soc dpcm.html Description Dynamic PCM allows an ALSA PCM device to digitally route its PCM audio to various digital endpoints during the PCM stream runtime. e. ...
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https://blog.csdn.net/zyuanyun/article/details/59170418 https://blog.csdn.net/whshiyun/article/details/80889838 ALSA Asoc框架如下图: Asoc分为machine ...
参考: https://elixir.bootlin.com/linux/v4.9.218/source/sound/soc/soc-core.c#L3159 https://blog.csdn. ...
当app在调用snd_pcm_writei时,alsa core将app传来的数据搬到HW buffer(即DMA buffer)中,alsa driver从HW buffer中读取数据传输到硬件播放。 ALSA buffer是采用ring buffer来实现的。ring buffer有多个HW ...
参考: https://elixir.bootlin.com/linux/v4.9.218/source/sound/soc/soc-dapm.c#L804 https://blog.csdn.n ...
参考: https://elixir.bootlin.com/linux/v4.9.218/source/sound/soc/soc-core.c#L3314 https://blog.csdn. ...
参考: https://elixir.bootlin.com/linux/v4.9.218/source/sound/soc/soc-core.c#L3034 https://blog.csdn. ...
在介绍PCM 之前,我们先给出创建PCM实例的框架。 #include <sound/pcm.h> .... /* hardware definition */ sta ...
一. alsa展现的三层结构: (1)audio interface: audio interface就是声卡,它含有hardware buffer,注意,这个hardware buffer是在声卡里面,不是内存。 (2)computer ...