From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Takashi Iwai <tiwai@suse.de>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Mac mini sound woes
Date: Mon, 28 Mar 2005 09:42:00 +1000 [thread overview]
Message-ID: <1111966920.5409.27.camel@gaston> (raw)
Hi Takashi !
I'm looking into adding proper sound support for the Mac Mini. The
problem is that from what I've seen (Apple driver is only partially
opensource nowadays it seems, and the latest darwin drop is both
incomplete and doesn't build), that beast only has a fixed function D->A
converter, no HW volume control.
It seems that Apple's driver has an in-kernel framework for doing volume
control, mixing, and other horrors right in the kernel, in temporary
buffers, just before they get DMA'ed (gack !)
I want to avoid something like that. How "friendly" would Alsa be to
drivers that don't have any HW volume control capability ? Does typical
userland libraries provide software processing volume control ? Do you
suggest I just don't do any control ? Or should I implement a double
buffer scheme with software gain as well in the kernel driver ?
Ben.
next reply other threads:[~2005-03-27 23:42 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-27 23:42 Benjamin Herrenschmidt [this message]
2005-03-28 1:42 ` Mac mini sound woes Andrea Arcangeli
2005-03-28 2:34 ` Benjamin Herrenschmidt
2005-03-29 3:36 ` Lee Revell
2005-03-29 3:41 ` Benjamin Herrenschmidt
2005-03-29 7:47 ` Marcin Dalecki
2005-03-29 8:18 ` Benjamin Herrenschmidt
2005-03-29 9:22 ` Marcin Dalecki
2005-03-29 10:22 ` Takashi Iwai
2005-03-30 1:45 ` Marcin Dalecki
2005-03-30 2:08 ` Lee Revell
2005-03-30 4:14 ` Lee Revell
2005-03-30 5:15 ` Steven Rostedt
2005-03-29 22:13 ` Lee Revell
2005-03-29 23:25 ` Chris Friesen
2005-03-29 23:39 ` Benjamin Herrenschmidt
2005-03-30 1:48 ` Marcin Dalecki
2005-03-30 5:42 ` Lee Revell
2005-03-30 1:45 ` Marcin Dalecki
2005-03-29 10:02 ` Takashi Iwai
2005-03-29 11:04 ` Benjamin Herrenschmidt
2005-03-29 12:12 ` Takashi Iwai
2005-03-29 19:05 ` Lee Revell
2005-03-29 19:31 ` Takashi Iwai
2005-03-29 20:11 ` Lee Revell
2005-03-29 22:03 ` Benjamin Herrenschmidt
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