31 Aug
2012
31 Aug
'12
2:39 p.m.
Hi
Kinda new to linux audio and still a bit new to dev generally and I'm
trying to understand the basis of linux audio.
By that, I mean the ALSA API :
I would like to use the PCM interface and the mixer interface to mix 2
sounds and understand the real meaning of a mixer used in the Audio
Architectures.
For now I understood that the mixer interface uses the High level control
interface (hcontrol), which uses basic kernel modules.
I was wondering if anyone had some docs or examples of a program that uses
the mixer interface ?
Thanks
--
Alex
31 Aug
31 Aug
3:04 p.m.
On Fri, Aug 31, 2012 at 8:39 AM, Alexandre <alexduthil(a)gmail.com> wrote:
Hi
Kinda new to linux audio and still a bit new to dev generally and I'm
trying to understand the basis of linux audio.
By that, I mean the ALSA API :
I would like to use the PCM interface and the mixer interface to mix 2
sounds
the mixer interface does not do that. its an API to control the hardware
mixer (if any) present in the audio interface hardware. a lot of current
audio interface hardware is incapable of mixing sound from multiple
sources, so this is generally done in software.
3:19 p.m.
so if understand, a single audio stream is coming from the software mixer,
which mixes multiple stream from different sources, and transfered using the
PCM interface to th kernel and then to the hardware ? the software mixing in
alsa is done by dmix i guess ?
Paul Davis wrote:
On Fri, Aug 31, 2012 at 8:39 AM, Alexandre <alexduthil(a)gmail.com> wrote:
--
View this message in context:
http://old.nabble.com/Trying-to-understand-mixer-in-ALSA-API-tp34373422p343…
Sent from the linux-audio-dev mailing list archive at Nabble.com.
Hi
Kinda new to linux audio and still a bit new to dev generally and I'm
trying to understand the basis of linux audio.
By that, I mean the ALSA API :
I would like to use the PCM interface and the mixer interface to mix 2
sounds
the mixer interface does not do that. its an API to control the hardware
mixer (if any) present in the audio interface hardware. a lot of current
audio interface hardware is incapable of mixing sound from multiple
sources, so this is generally done in software.
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Linux-audio-dev(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-dev
3:28 p.m.
On Fri, Aug 31, 2012 at 9:19 AM, Zixns <alexduthil(a)gmail.com> wrote:
so if understand, a single audio stream is coming from the software mixer,
which mixes multiple stream from different sources, and transfered using
the
PCM interface to th kernel and then to the hardware ? the software mixing
in
alsa is done by dmix i guess ?
ALSA can do that, but its not widely used.
most linux music-creation and pro-audio applications use JACK rather than
ALSA.
4:50 p.m.
ok, last questions on the software mixer. On my linux distribution, i have
alsa with pulseaudio. i know that pulseaudio is doing software mixing. If I
remove pulseaudio, I can still do software mixing : which lib / program in
alsa is doing it ?
Paul Davis wrote:
On Fri, Aug 31, 2012 at 9:19 AM, Zixns <alexduthil(a)gmail.com> wrote:
--
View this message in context:
http://old.nabble.com/Trying-to-understand-mixer-in-ALSA-API-tp34373422p343…
Sent from the linux-audio-dev mailing list archive at Nabble.com.
so if understand, a single audio stream is coming from the software
mixer,
which mixes multiple stream from different sources, and transfered using
the
PCM interface to th kernel and then to the hardware ? the software mixing
in
alsa is done by dmix i guess ?
ALSA can do that, but its not widely used.
most linux music-creation and pro-audio applications use JACK rather than
ALSA.
_______________________________________________
Linux-audio-dev mailing list
Linux-audio-dev(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-dev
4:58 p.m.
----- Original Message -----
From: "Zixns" <alexduthil(a)gmail.com>
ok, last questions on the software mixer. On my linux distribution, i
have
alsa with pulseaudio. i know that pulseaudio is doing software
mixing. If I
remove pulseaudio, I can still do software mixing : which lib /
program in
alsa is doing it ?
your alsa setup surely uses dmix:
http://www.alsa-project.org/main/index.php/Asoundrc#dmix
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5 comments
4 participants
participants (4)
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Alexandre -
Paul Davis -
SxDx -
Zixns