From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: trigger commands
Date: Mon, 24 Mar 2003 10:55:07 +0100
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To: Giuliano Pochini <pochini@shiny.it>
Cc: alsa-devel <alsa-devel@lists.sourceforge.net>
List-Id: alsa-devel@alsa-project.org

At 23 Mar 2003 18:31:04 +0000,
Giuliano Pochini wrote:
> 
> What are PUSH, RELEASE, SUSPEND, RESUME trigger commands supposed to do
> ?

* pcm stream pausing
imagine the pause-button is pushed and released.
these commands are issued only when SNDRV_PCM_INFO_PAUSE is set to
info field of snd_pcm_hardware_t.

- PAUSE_PUSH
	pause the stream
- PAUSE_RELEASE
	restart the paused stream

* power-management
called when the power-management status is changed.
these commands are issued only when SNDRV_PCM_INFO_RESUME is set to
info field of snd_pcm_hardware_t (and of course pm is supported).

- SUSPEND
	suspend the streams; usually identical with STOP command
- RESUME
	resume the streams; usually identical with START command


Takashi


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