Hi Joshua
When I run my application on Windows it uses DirectSound and DirectSound
does software mixing as well, but is,even with its poor performance,
considerably faster than Java software mixing. So I assumed that ALSA
would perform better than Java software mixing.
I have to admit that I am a bit surprised about ALSA. I have a good
sound card (M-Audio Delta 1010LT) which should do hardware mixing, but
when used on Linux with ALSA it does not allow me to used more than one
DataLine and so seems to not provide mixing.
On Linux there is unfortunately not much else to use than ALSA when
using Java.
Maybe I should try Java software mixing and aoss, I only tried it on
Windows and there performance was very poor.
Lars
Joshua Smith wrote:
> The "poor performance" is because its a software mixer, not because
> it's Java. It totally sucks compared with hardware mixing, but I'd be
> very surprised if an ALSA software mixer gave any different performance.
>
> I have to profess ignorance about exactly what AOSS does. All I know
> is that with it, Java behaves well, and without it Java behaves badly
> (on some hardware, at least).
>
> My understanding of things, which could be grossly inaccurate, is that
> aoss is a compatibility layer that translates OSS calls into their
> ALSA equivalents.
>
> -Joshua
>
> On Nov 17, 2008, at 12:44 PM, Lars Schnoor wrote:
>
>> Hi Joshua
>> Thank you for your reply, but I tried Javas software mixer and it gives
>> me extremely poor performance. I am working on an voice application and
>> the latency of Javas software mixer is just unbearable. Wouldn't
>> starting Java with aoss cause it to use OSS instead of ALSA, is that
>> really what I want?
>>
>> Lars
>>
>> Joshua Smith wrote:
>>> For the most compatibility, I would recommend that you tell Java to
>>> use its own software headspace mixer:
>>>
>>> Mixer.Info [] mixerInfo = AudioSystem.getMixerInfo();
>>> Mixer.Info useMixer = null;
>>> for (int i=0;i<mixerInfo.length;++i)
>>> if (mixerInfo[i].getName().startsWith("Java Sound"))
>>> useMixer = mixerInfo[i];
>>>
>>> The latency sucks, but it is quite reliable cross-platform.
>>>
>>> Then, in Linux, make sure you use "aoss" to launch Java.
>>>
>>> -Joshua
>>>
>>> On Nov 17, 2008, at 3:51 AM, Lars Schnoor wrote:
>>>
>>>> Hi everyone
>>>> I am using JavaSound on Linux where it as a default uses ALSA. I tried
>>>> to figure out how to configure ALSA with respect to JavaSound, but
>>>> couldn't find anything. I read that ALSA can, if the sound card
>>>> hardware
>>>> does not support it, do mixing in software. How can I configure
>>>> ALSA for
>>>> this and it would also be great if someone could tell me how to
>>>> split a
>>>> multi-channel sound card into separate mono or stereo devices in
>>>> JavaSound.
>>>> Thanks in advance!
>>>>
>>>> Lars
>>>>
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>>
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