[alsa-devel] ALSA Questions - MUTE and PLAYBACK RATE
Hello ALSA people,
How do you use the ALSA API to mute the MICROPHONE?
How do you use the ALSA API to mute the SPEAKER?
How do you reduce the playback latency or delay? I am reading my audio and I notice that there is a delay ... or some kind of latency. I want the audio played as soon as it is read or something close to that.
Thanks, X
Xavi Alexis wrote:
How do you use the ALSA API to mute the MICROPHONE? How do you use the ALSA API to mute the SPEAKER?
These questions assume that "the MICROPHONE" and "the SPEAKER" actually exist. However, there are cards that have none, or more than one, or that cannot be muted, or where the muting isn't controllable by software.
In the general case, these settings should be controlled by the user with a mixer application.
What are you trying to do?
How do you reduce the playback latency or delay?
Reduce the buffer size. However, this increases the danger of buffer overruns.
You need low latency only when you are generating sounds in real time in response to external events.
I want the audio played as soon as it is read or something close to that.
Does "read" mean "read from disk" or "capture"?
Regards, Clemens
Thank you Clemens for your answers:
A few more questions:
What is the SPECIFIC function to reduce the BUFFER size?
When I say read ... I am reading the data over a socket ...
Thanks again.
x
________________________________ From: Clemens Ladisch clemens@ladisch.de To: Xavi Alexis xamalek@yahoo.com Cc: alsa-devel@alsa-project.org Sent: Thu, October 21, 2010 5:39:46 AM Subject: Re: [alsa-devel] ALSA Questions - MUTE and PLAYBACK RATE
Xavi Alexis wrote:
How do you use the ALSA API to mute the MICROPHONE? How do you use the ALSA API to mute the SPEAKER?
These questions assume that "the MICROPHONE" and "the SPEAKER" actually exist. However, there are cards that have none, or more than one, or that cannot be muted, or where the muting isn't controllable by software.
In the general case, these settings should be controlled by the user with a mixer application.
What are you trying to do?
How do you reduce the playback latency or delay?
Reduce the buffer size. However, this increases the danger of buffer overruns.
You need low latency only when you are generating sounds in real time in response to external events.
I want the audio played as soon as it is read or something close to that.
Does "read" mean "read from disk" or "capture"?
Regards, Clemens _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
participants (2)
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Clemens Ladisch -
Xavi Alexis