Red Hat Bugzilla – Bug 431178
GStreamer and cdparanoia cause CD drive spins at maximum speed when playing CD
Last modified: 2009-01-09 00:53:52 EST
Description of problem:
Playing an audio CD on my laptop (HP DV8291ea) using a GStreamer based
application (like gst-launch, totem, rhythmbox) causes the CD drive to run at
full speed. This is disturbing both for the noise and for the vibrations. Using
other apps like Amarok does not push the drive to the limit.
I have tracked down the problem to be either the gstcdparanoiasrc plugin or the
cdparanoia library, but had not time to read the code.
You can test it easily by doing:
gst-launch cdparanoiasrc ! alsasink
and then Amarok and comparing the two.
There is a similar bug report in the Ubuntu launchpad, so this is not Fedora
Version-Release number of selected component (if applicable):
[neugens@nirvana ~]$ rpm -q gstreamer-plugins-base ; rpm -q cdparanoia
Steps to Reproduce:
1. Insert you favorite CD
2. run a GStreamer based application, or use gst-launch like:
gst-launch cdparanoiasrc ! alsasink
3. Listen to the drive spinning at fool (not a typo) speed
The CD drive spins at full speed
To play an audio CD, a read speed of 1x is the only one needed.
It seems to happen only with GStreamer; cdparanoiasrc has a "read-speed"
property, but it seems not to be honored. That is, this command:
gst-launch cdparanoiasrc read-speed=24 ! alsasink
and this command:
gst-launch cdparanoiasrc read-speed=1 ! alsasink
have the same effect.
Thinking about it, the fact that read-speed is not honored, may hide a bug in
cdparanoia and not in gstreamer itself... I'll try to give a look at the code
tonight. I don't think it's an high priority bug, but it is quite disturbing if
you plan to use your Linux box as media center (or.. well, if you use your
laptop as a huge cdplayer like I do :).
After further analysis I think that this is in fact a bug against cdparanoia.
I've not gone through accurate testing yet, but I think that the problem is in
the function "scsi_init_drive" (see
cdparanoia-III-alpha9.8/interface/scsi_interface.c:1612). Apparently, setting
drive speed is not supported by cdparanoia on SCSI devices...
I've attached two patches that fix the problem for me. The first adds speed
setting capability via ioctl to cdparanoia (apply to cdparanoia-alpha9.8-27.2),
the other sets the default speed to 4 in gstreamer-plugin-base (apply to
gstreamer-plugins-base-0.10.15-1). These need more testings as they may kill
your cddrive, so use with care!! I have the patched spec files for rpm also if
you need these.
Created attachment 293804 [details]
Add set_speed to scsi_interface.c for cdparanoia-III-alpha9.8
Apply this patch to cdparanoia-alpha9.8-27.2.src.rpm
Created attachment 293805 [details]
Sets cd drive speed to default to 4 (as xine also does) instead of the default
Apply this patch to gstreamer-plugins-base-0.10.15-1.fc8.src.rpm
These look plausible to me, and didn't get a clear nak from the cdparanoia
maintainer. Building for rawhide now. Can you test them from rawhide, or
should I push F8 update candidates too?
If you can push on update-testing, that would be great for me :)
What is the status of this bug? Is it in the process of being fixed? Or can we
I'm moving it to cdparanoia since that's where the bug seems to apply to.
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