[alsa-devel] [PATCH] ALSA: pcm: add a documentation for tracepoints

[Takashi Iwai]

On Mon, 26 Jun 2017 15:27:21 +0200,
Takashi Sakamoto wrote:
> 
> +In a design of ALSA PCM core, data transmission is abstracted as PCM substream.
> +Applications manage PCM substream to maintain data transmission for PCM frames.
> +Before stating the data transmission, applications need to configure PCM

starting

> +This structure includes several types of parameters. Applications set preferable
> +value to these parameters, then execute ioctl(2) with SNDRV_PCM_IOCTL_HW_REFINE
> +or SNDRV_PCM_IOCTL_HW_PARAMS. The former is used just for querying available
> +set of parameters.

REFINE isn't only for querying but may also refine, i.e. partially
change the parameters.

> +Pamraeters in the buffer are changed according to

Parameters


thanks,

Takashi