Subject: Re: [linux-audio-user] CD audio
From: Speaker to Vegetables (speaker-to-vegetables_AT_pobox.com)
Date: Wed Jul 17 2002 - 01:26:12 EEST
On Tuesday 16 July 2002 01:08 pm, Joseph Zitt wrote:
> On Tue, 16 Jul 2002 12:43:50 -0400
>
> Speaker to Vegetables <speaker-to-vegetables_AT_pobox.com> wrote:
> > In looking at the lsmod module list below, I have to wonder about
> > the module "audio". It uses the soundcore and usbcore modules --
> > why would
> >
> > it do that if it is not a usb audio driver? Since no ALSA modules
> > are loaded, it would have to be an old-style (sometimes confusingly
> > called
> >
> > OSS) sound driver. Probably the Red Hat installer set this up
> > automagically. I wonder if it works?
> >
> > Does playing a .wav file (with, for example, xmms) work?
>
> Yes, it does.
I should have asked, when you say playing a .wav file works, you mean it
works with the USB audio interface, right? If so, then Red Hat must
ship with USB audio support (at least for playback) patched into the
old-style audio system.
Note that Pedro Lopez-Cabanillas <plcl_AT_telefonica.net> has noticed from
the install output, that your computer appears to have more than one
set of kernel sources installed, and the ALSA driver configure/install
scripts get confused by this and install the driver files in the wrong
place under /lib/modules. Copying the driver files as he suggests
should work as far as I know. Alternatively, the ./configure script for
ALSA probably has an optional argument to tell it where is the kernel
source directory corresponding to the kernel you run (2.4.18-3 vs.
2.4.18-3custom).
Some background: Linux is in the middle of (or perhaps almost finished
with) replacing one "sound system" with another. The older sound system
supports the Open Sound System (OSS) APIs, the new sound system is
called ALSA and supports the new ALSA APIs as well as the old OSS APIs.
Each Linux sound application (such as xmms and alsaplayer) may support
either or both of these APIs.
The most immediate relevance of all this is that if and when you get the
ALSA sound system properly installed, you probably will have to figure
out how to turn OFF the old sound system, so it will let go of the USB
audio device, so the ALSA sound system can talk to it.
Based on what I currently understand, I might well try to download and
build from source a non-broken version of xmms before I tried to
replace Red Hat's sound system with ALSA. On the other hand, ALSA is
clearly the wave of the future.
> Grip rips successfully into a WAV file that XMMS can play.
>
> > Once extracting audio, and playing audio, both work, it will be
> > time to try a program that does both at once.
>
> ... and we're back to the initial problem: Grip (or other programs)
> can not play audio directly from a CD through the USB-audio
> interface.
But at least we know that the operating system support for digital audio
extraction is working, which I didn't know before.
-- "Can you remember the future? Forget it!"
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