Linux Device Driver For Xbox 360 Audio Options

[xlokix]

For those that don't already know.. The linux Audio device driver for Xbox 360 was released. Here's a C/P of JC4360 post from xboxhacker.net.

jc4360 wrote:

I am releasing the first version of linux device driver for xbox 360 audio. you can get source from here: http://www.megaupload.com/?d=SVAUYFBL. The device driver is alsa compitable, so basically you can compile mplayer and then it should play various music formats for you easily. It supports both analog stereo and digital spdif (only dobly digital by now). Thanks for tmbinc for his finding on 360 audio hardware details and his help on debuging the code. The license for the code is GPL.

In order to compile it, you will need to properly edit sound/pci/Makefile with the following statements, and also change Kconfig if needed. do not forget to enable ALSA support in your kernel.
snd-xenon-objs := xenon_snd.o
obj-$(CONFIG_SND_XENON) += snd-xenon.o

To compile mplayer, download MPlayer-1.0rc2.tar.bz2 and edit libmpcodecs/ad_hwac3.c by applying the following patch:

CODE

--- ad_hwac3.c  1969-12-31 19:15:52.000000000 -0500
+++ ad_hwac3.c.org      1969-12-31 19:15:17.000000000 -0500
@@ -144,4 +144,17 @@
}

+static inline unsigned short bswap16(unsigned short a)
+{
+      return ((a&0xff)<<8) | ((a&0xff00)>>8);
+}
+
+static inline void mem_swap16(void *buf, int line)
+{
+    int i=0;
+    uint16_t *buf16 = (uint16_t *)buf;
+    for (i=0; i<line/2; i++)
+        buf16[i]=bswap16(buf16[i]);
+}
+
static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
{
@@ -177,4 +190,6 @@
     memset(buf + 8 + len, 0, 6144 - 8 - len);

+    mem_swap16(buf, 6144);
+
     return 6144;
   }
@@ -375,4 +390,6 @@
   memset(&buf[fsize + 8], 0, nr_samples * 2 * 2 - (fsize + 8));

+  mem_swap16(buf, nr_samples * 2 * 2);
+
   return nr_samples * 2 * 2;
}

To test:
-bash-3.2# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: AudioPCI [Xenon AudioPCI], device 0: Xenon Audio [Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: AudioPCI [Xenon AudioPCI], device 1: Xenon Audio [Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0

stereo music:
./mplayer -ao alsa:device=hw=0.0 music.mp3/ape/flac/wav

digital music:
./mplayer -ao alsa:device=hw=0.1 -ac hwac3 music.ac3
./mplayer -ao alsa:device=hw=0.1 -ac hwdts music.dts



Please feel free to improve this driver for the following things:
1) Interrupt: I could not get pci interrupt to work. This driver currently uses a timer interrupt.
2) DTS passthrough: my receiver could not decode the raw dts bit stream sent by mplayer, I guess one register was not set correctly for dts passthrough. If you have a jtag setup on xbox 360 motherboard, you could help on this: put a dvd movie with dts track into 360 drive and play(check if your receiver receive dts signal), read 64 bytes from address 0xea001600 with your jtag device and then post the result here.
3) Mixer such as volumn setting etc.

The driver may not be bug free. I am not responsible for any damge that the driver may cause to your hardware, so use it at your own risk.

This post has been edited by xlokix: Oct 5 2009, 02:48 AM

[GOVATENT]

this is cool. I have already applied the update on my console so I will have to get another one. (Which won't happen rather build a HTPC at that point) but it's great to see another step toward XBMC getting started.

[geoffmac]

Any chance someone could do a step by step install for linux noobs like me?

I did manage to install to Debian Etch.

Just need graphics acceleration now

Cheers and well done!

[iD4rK]

very... VERY... NICE!

[DuggyUK]

Any chance someone could do a step by step install for linux noobs like me?

I did manage to install to Debian Etch.

Just need graphics acceleration now

Cheers and well done!

just follow the instructions in the first post. Basically you are recompiling kernel, and then mplayer.

What you need to do in a nut shell is get the kernel sources for your box. apply the patches as above, recompile the kernel, install.

This post has been edited by DuggyUK: Oct 6 2009, 01:23 PM

[geoffmac]

just follow the instructions in the first post. Basically you are recompiling kernel, and then mplayer.

What you need to do in a nut shell is get the kernel sources for your box. apply the patches as above, recompile the kernel, install.

Sounds easy doesnt it lol but for someone who doesnt know their way around the terminal its not obvious.

Thanks

[RRoD420]

This is truly amazing, talented fuckin people. Are these kernal updates all going to be usb updated or has to be reflashed? You know in less than 24 hours someones going to release a full kernal update for xell lol

[DuggyUK]

Sounds easy doesnt it lol but for someone who doesnt know their way around the terminal its not obvious.

Thanks

No worries, happy to help. Which bit are you stuck on?

[geoffmac]

No worries, happy to help. Which bit are you stuck on?

lol erm exactly a step by step would help
Least then I can learn from the commands and maybe attempt something similar in the future.

And why exactly we need mplayer is that not an alternative to VLC and does that not mean only sound through mplayer? or does mplayer handle all movie decoding?

Cheers

[HotKnife420]

I, too, would like a 'step by step' explanation of how to install this driver. I'd love to test it, but I must admit, I'm not very familiar with linux. Running Ubuntu 7.10 on my 360, atm.

[xlokix]

Here's a new kernel with the xenon sound modules.

http://www.megaupload.com/?d=T6C2XXD5

Replace the vmlinux from your sata2 CD with this one. Extract the 2.6.24.3 folder in the /lib/modules directory.

Then run the command:

sudo echo "snd-xenon" > /etc/modules

Reboot.

This post has been edited by xlokix: Nov 18 2009, 01:14 AM

[Chrisoldinho]

Here's a new kernel with the xenon sound modules.

http://www.megaupload.com/?d=T6C2XXD5

Replace the vmlinux from your sata2 CD with this one. Extract the 2.6.24.3 folder in the /lib/modules directory.

Then run the command:

sudo echo "snd-xenon" > /etc/modules

Reboot.

Hi,

Picking this thread up after a long time of inactivity...

So in effect I replace the vmlinux I use to boot the regular sata2 CD (and reburn) to launch Debian (Lenny) and once in the GUI open a terminal and type the command: sudo echo "snd-xenon" > /etc/modules after extracting the contents of the /lib/modules directory from the file uploaded.

Thanks, Chris.

[Chrisoldinho]

Hi,

Picking this thread up after a long time of inactivity...

So in effect I replace the vmlinux I use to boot the regular sata2 CD (and reburn) to launch Debian (Lenny) and once in the GUI open a terminal and type the command: sudo echo "snd-xenon" > /etc/modules after extracting the contents of the /lib/modules directory from the file uploaded.

Thanks, Chris.

It's ok - working perfectly now Loving the Ubuntu sounds, lol