Real-Time Audio Part 2

Posted 01-26-2009 at 11:10 PM by GlennsPref

and added the Edirol patch to the RT kernel....

vi is a handy editor, We need admin rights to “save these files here”...

su (enter root password)

vi /usr/src/linux/Makefile

Quick vi tute

Code:

vi is operated in a shell, like Konsole or term

	Quick keys...

	I = insert “edit mode”
	Esc = exit mode/s
	:w = write
	:q = quit
	:wq! = force write quit (does not always over-ride the admin permissions)

/usr/src/linux/Makefile (Only showing the top 5 lines or so)...

Code:

	VERSION = 2
	PATCHLEVEL = 6
	SUBLEVEL = 26
	EXTRAVERSION = -music.8-1.rt13.1mdv
	NAME = GamesBox.GlennsPref.net

uname -a reveals the details of the running kernel (reflected from the installed kernel),
I don't want them all named “x.x-x-custom-x.x”,
I like task names more than reference numbers in my boot loader,
less geeky, more task oriented.

uname -a

Code:

	glenn@GamesBox:~/bin$ uname -a                                                                  (22-01 13:33)
	Linux GamesBox.GlennsPref.net 2.6.26-music.8-1.rt13.1mdv #3 SMP PREEMPT RT Wed
	Jan 14 20:45:45 EST 2009 x86_64 AMD Athlon(tm) 64 X2 Dual CoreProcessor 5600+
 	GNU/Linux glenn@GamesBox:~/bin$

Patch the kernel with the Edirol patch.

Copy the lines from the code box below to a file named /usr/src/linux/sound/usb/Edirol
-patch.diff

Change to the directory and run the patch...

cd /usr/src/linux/sound/usb
sudo patch < Edirol-patch.diff

Note:
When tested (25-01-2009, 12:09), the response was “patching file usbaudio.c
Reversed (or previously applied) patch detected! Assume -R? [n]”
I [ctrl+c] to kill the process (exit). I believe the process of how and where to patch the
kernel is concise now.

The Edirol UA-25EX Patch code...
ref. http://ubuntuforums.org/archive/index.php/t-908845.html

Copy all text in the next frame...(except the words, code ;-)

Code:

Add Alsa support for Roland Edirol UA-25EX in Advanced mode
(for MIDI support and sample rates of 48 kHz and 96 kHz)
usbquirks.h
================================================== =================
diff -u sound/usb/usbquirks.h.00 sound/usb/usbquirks.h
--- sound/usb/usbquirks.h.00 2007-11-28 02:15:11.000000000 -0700
+++ sound/usb/usbquirks.h 2007-11-28 02:17:51.000000000 -0700
@@ -1311,6 +1311,37 @@
}
},
/* TODO: add Edirol MD-P1 support */
+{ /*
+ * This quirk is for the "Advanced" modes of the Edirol UA-25EX.
+ * If the switch is not in an advanced setting, the UA-25EX has
+ * ID 0x0582/0x00a4 and is standard compliant (no quirks), but
+ * offers only 16-bit PCM at 44.1 kHz and no MIDI.
+ */
+ USB_DEVICE_VENDOR_SPEC(0x0582, 0x00e6),
+ .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+ .vendor_name = "EDIROL",
+ .product_name = "UA-25EX",
+ .ifnum = QUIRK_ANY_INTERFACE,
+ .type = QUIRK_COMPOSITE,
+ .data = (const struct snd_usb_audio_quirk[]) {
+ {
+ .ifnum = 0,
+ .type = QUIRK_AUDIO_EDIROL_UA700_UA25
+ },
+ {
+ .ifnum = 1,
+ .type = QUIRK_AUDIO_EDIROL_UA700_UA25
+ },
+ {
+ .ifnum = 2,
+ .type = QUIRK_AUDIO_EDIROL_UA700_UA25
+ },
+ {
+ .ifnum = -1
+ }
+ }
+ }
+},
{
/* Roland SH-201 */
USB_DEVICE(0x0582, 0x00ad),

Tip:
Always leave a blank line at the end of config files, so the shell program (zsh, bash, etc)
knows it's a valid end of file (eof). Ensure when you compile your kernel to activate the
module snd_usb_audio [USB_AUDIO]. When you lsmod, it should be in the list.

If you have the RT kernel-source installed, your free to build the kernel, you may need to do
this again, it's ok, it's just time. I had to do the config twice or more before I completed the
exercise, but I think we'll just install each part once. You should still be in the /usr/src/linux
directory.

Type...
make xconfig
go to Device Driver->Sound->Alsa->USB devices and activate the module USB-Audio
(by blablack)

Check with the perl script to be sure...

Quote:

reference pages...
Patch the kernel with the Edirol patch if required, by blablack,
http://ubuntuforums.org/archive/index.php/t-908845.html
The kernel patch Edirol FA-4x and UA-25ex From the Ubuntu forums...
http://ubuntuforums.org/showthread.php?t=855327
http://ubuntuforums.org/archive/index.php/t-855327.html
links to this alsa wiki page...
http://alsa.opensrc.org/index.php/Edirol_UA-4FX
Which links to the previous ua-25 page.
http://alsa.opensrc.org/index.php/Ed...ce_information

Real-Time Audio Part 2

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