From: Takashi Iwai <tiwai@suse.de>
To: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Cc: alsa-devel@alsa-project.org
Subject: Re: [PATCH] ALSA: pcm: add a documentation for tracepoints
Date: Mon, 26 Jun 2017 15:41:38 +0200 [thread overview]
Message-ID: <s5hefu6lvcd.wl-tiwai@suse.de> (raw)
In-Reply-To: <20170626132721.5509-1-o-takashi@sakamocchi.jp>
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
prev parent reply other threads:[~2017-06-26 13:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-26 13:27 [PATCH] ALSA: pcm: add a documentation for tracepoints Takashi Sakamoto
2017-06-26 13:41 ` Takashi Iwai [this message]
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