[alsa-devel] Accessing alsa device in kernel space.
Hi, how to access to alsa device from kernel space? I want to create driver for virtual soundcard, that will perform mixing and rate converting in kernelspace, and put result in real hardware. But I found no documentation how to open alsa device in kernel space :(
Best regards, Vasily.
At Sun, 5 Aug 2007 19:11:23 +0300, Vasily Khoruzhick wrote:
Hi, how to access to alsa device from kernel space? I want to create driver for virtual soundcard, that will perform mixing and rate converting in kernelspace, and put result in real hardware. But I found no documentation how to open alsa device in kernel space :(
You shouldn't do it. It'd be horribly messy. If you'd like to access the device files of other hardwares, simply use the user-space solution.
Takashi
On 6 August 2007 you wrote:
At Sun, 5 Aug 2007 19:11:23 +0300,
Vasily Khoruzhick wrote:
Hi, how to access to alsa device from kernel space? I want to create driver for virtual soundcard, that will perform mixing and rate converting in kernelspace, and put result in real hardware. But I found no documentation how to open alsa device in kernel space :(
You shouldn't do it. It'd be horribly messy. If you'd like to access the device files of other hardwares, simply use the user-space solution.
Takashi
Btw, why there's oss-emulation in kernel? AFAIK it can't use pcm-plugins (e.g. dmix), so oss-applications that try to play through /dev/dsp can't produce any sound, or they block soundcard and other programs can't use it.
At Mon, 6 Aug 2007 22:29:46 +0300, Vasily Khoruzhick wrote:
On 6 August 2007 you wrote:
At Sun, 5 Aug 2007 19:11:23 +0300,
Vasily Khoruzhick wrote:
Hi, how to access to alsa device from kernel space? I want to create driver for virtual soundcard, that will perform mixing and rate converting in kernelspace, and put result in real hardware. But I found no documentation how to open alsa device in kernel space :(
You shouldn't do it. It'd be horribly messy. If you'd like to access the device files of other hardwares, simply use the user-space solution.
Takashi
Btw, why there's oss-emulation in kernel? AFAIK it can't use pcm-plugins (e.g. dmix), so oss-applications that try to play through /dev/dsp can't produce any sound, or they block soundcard and other programs can't use it.
Because the OSS API _requires_ the kernel device file. We have user-space aoss wrapper, too.
Takashi
participants (2)
-
Takashi Iwai -
Vasily Khoruzhick