* Why is ALSA sending STOP/START commands to my driver during MP3 playback?
@ 2007-09-07 15:09 Timur Tabi
2007-09-07 23:44 ` Takashi Iwai
0 siblings, 1 reply; 2+ messages in thread
From: Timur Tabi @ 2007-09-07 15:09 UTC (permalink / raw)
To: alsa-devel
I'm developing an ASoC driver, and when I play an MP3 with mpg123, my driver's
trigger() function is called with the SNDRV_PCM_TRIGGER_STOP command and then
is immediately called again with SNDRV_PCM_TRIGGER_START.
Can someone tell me why ALSA would do this?
This only happens when playing an MP3. When I use aplay to play a regular
Wave file, I don't see this behavior.
My driver does not have the SNDRV_PCM_INFO_PAUSE bit set, because I haven't
gotten around to testing that capability. I suspect that if I did have that
bit set, I would be getting SNDRV_PCM_TRIGGER_PAUSE_PUSH and
SNDRV_PCM_TRIGGER_PAUSE_RELEASE calls instead.
--
Timur Tabi
Linux Kernel Developer @ Freescale
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Why is ALSA sending STOP/START commands to my driver during MP3 playback?
2007-09-07 15:09 Why is ALSA sending STOP/START commands to my driver during MP3 playback? Timur Tabi
@ 2007-09-07 23:44 ` Takashi Iwai
0 siblings, 0 replies; 2+ messages in thread
From: Takashi Iwai @ 2007-09-07 23:44 UTC (permalink / raw)
To: Timur Tabi; +Cc: alsa-devel
At Fri, 07 Sep 2007 10:09:38 -0500,
Timur Tabi wrote:
>
> I'm developing an ASoC driver, and when I play an MP3 with mpg123, my driver's
> trigger() function is called with the SNDRV_PCM_TRIGGER_STOP command and then
> is immediately called again with SNDRV_PCM_TRIGGER_START.
>
> Can someone tell me why ALSA would do this?
I guess OSS-emulation code does this (automatic recovery from XRUN).
Takashi
^ permalink raw reply [flat|nested] 2+ messages in thread
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2007-09-07 15:09 Why is ALSA sending STOP/START commands to my driver during MP3 playback? Timur Tabi
2007-09-07 23:44 ` Takashi Iwai
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