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Homebrew CMI 8738 drivers
d0gbert
post Oct 16 2006, 16:50
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Joined: 17-November 05
Member No.: 25818



Hi everyone!

I'm currently working on WDM drivers for soundcards based on the C-Media 8738/8768 chip. I plan to release the entire source code under a BSD-like license sometime in the future. I'm mainly interested in the S/PDIF connectivity because the DAC of the card sucks.

For testing, you need:
- a CMI 8738-MX/8768 based soundcard with S/PDIF (which are available for around 10-15 USD)
- Windows 2000/XP

Some of the features are:
- bitperfect S/PDIF output for 16bit 44.1/48/88.2/96kHz stereo signals through kernel streaming / dsound / waveout
- bitperfect AC3/DTS passthrough
- multi-channel output (that disables the S/PDIF output port unfortunately)
- recording support
- basic mixer support
- UART support (but disabled for now)

Apparently, the C-Media chip supports only 16 bit contrary to the claims in their specs. I haven't been able to get 24bit output even with the official drivers. But 96kHz output seems to work fine on the newer 8738 chips.

You can help me by posting your chip version and configuration, and testing whether 16bit/96kHz and 24bit/48kHz output through kernel streaming works (foobar2000, winamp have the necessary plugins). I'm specifically looking for people who have means to tell a 16bit S/PDIF stream from a 24bit stream.
When the driver loads, it prints the version of your chip to the kernel debugger. You need a running instance of DebugView (http://www.sysinternals.com/Utilities/DebugView.html) to catch the strings. In other words: open DebugView before updating the drivers.

Note that the drivers aren't signed, so you have to install them manually (Update Driver => Install from a list or specific location => Don't search. I will choose the driver to install => Continue anyway).
A 64-bit build has been successfully tested, and I'll probably release a build sometime soon.

Here are the download links for the latest version:


So long,

dogbert

This post has been edited by d0gbert: Mar 14 2008, 20:30
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kron
post Dec 29 2006, 19:29
Post #2





Group: Members
Posts: 6
Joined: 12-December 06
Member No.: 38619



Hi again,

I tried the Winamp Kernel-streaming plugin with your drivers,
but I couldn't pick any output in the ks-settings, there was nothing to choose from.
Any idea, what this could be about?
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Posts in this topic
- d0gbert   Homebrew CMI 8738 drivers   Oct 16 2006, 16:50
- - Leto Atreides II   Awesome! I'll try these drivers out tod...   Oct 17 2006, 02:25
- - Leto Atreides II   The only thing debugview shows is: [2692] Exiting ...   Oct 17 2006, 02:59
- - Leto Atreides II   My system is a Soltek QBic 3801 with a built-in CM...   Oct 17 2006, 03:38
|- - d0gbert   QUOTE (Leto Atreides II @ Oct 16 2006, 20...   Oct 17 2006, 07:48
|- - Leto Atreides II   QUOTE (d0gbert @ Oct 16 2006, 22:48) QUOT...   Oct 17 2006, 09:46
|- - d0gbert   new release 0.92: - built with the latest WDK (ver...   Oct 21 2006, 02:02
|- - René Eske Jensen   QUOTE (d0gbert @ Oct 21 2006, 02:02) I...   Nov 8 2006, 08:13
|- - d0gbert   QUOTE I had some problems during installation in V...   Nov 8 2006, 14:13
|- - Leto Atreides II   QUOTE (d0gbert @ Nov 8 2006, 05:13) Yeah,...   Nov 8 2006, 19:41
|- - Leto Atreides II   QUOTE (Leto Atreides II @ Nov 8 2006, 10...   Nov 8 2006, 20:56
- - Leto Atreides II   Thanks.   Oct 21 2006, 03:00
- - Leto Atreides II   When do you think you'll start releasing the s...   Oct 21 2006, 05:45
|- - d0gbert   QUOTE (Leto Atreides II @ Oct 20 2006, 22...   Oct 21 2006, 12:54
- - zima   I wonder...how hard would be to modify drivers for...   Oct 31 2006, 11:25
|- - d0gbert   QUOTE (zima @ Oct 31 2006, 04:25) I wonde...   Oct 31 2006, 13:49
- - howardbut   it sounds awesome! but could I have the follow...   Nov 2 2006, 20:12
|- - d0gbert   QUOTE (howardbut @ Nov 2 2006, 13:12) it ...   Nov 2 2006, 21:02
|- - howardbut   thank you d0gbert. referring to your reply, could ...   Nov 3 2006, 01:16
- - Mike Giacomelli   Mind if I ask how you got into Windows driver deve...   Nov 2 2006, 21:26
|- - d0gbert   QUOTE (Mike Giacomelli @ Nov 2 2006, 14:2...   Nov 3 2006, 09:53
- - René Eske Jensen   Hi again, Just another thing - the mute function ...   Nov 8 2006, 12:59
- - lavak   This is fantastic. I have a soyo sy-k7v dragon pl...   Nov 14 2006, 07:38
|- - d0gbert   OK, all-in-one answer: QUOTE I have noticed that ...   Nov 15 2006, 18:35
|- - lavak   QUOTE (d0gbert @ Nov 15 2006, 11:35) QUOT...   Nov 15 2006, 21:22
- - Leto Atreides II   AFAIK the DAC level slider isn't adjusting any...   Nov 14 2006, 17:55
- - qs_test   Hello, I am using an onboard C-Media-Chip CIM8738...   Nov 15 2006, 07:09
- - René Eske Jensen   Just tried the 0.94 driver out in both XP and Vist...   Nov 23 2006, 21:45
- - d0gbert   I've just uploaded a new version (0.9.5) which...   Nov 23 2006, 23:45
|- - René Eske Jensen   QUOTE (d0gbert @ Nov 23 2006, 23:45) René...   Nov 25 2006, 14:03
- - cervicek   Hi, please somebody could help me with SPDIF probl...   Nov 30 2006, 10:12
|- - d0gbert   cervicek, the SPDIF interface needs to be set as t...   Nov 30 2006, 11:59
- - cervicek   Thanks. I'll try it.. and ac3filter must be se...   Nov 30 2006, 12:33
|- - d0gbert   QUOTE (cervicek @ Nov 30 2006, 05:33) Tha...   Nov 30 2006, 18:54
- - ElKabong   If I get a cheap audio card with an 8738, will I b...   Nov 30 2006, 21:37
|- - d0gbert   QUOTE (ElKabong @ Nov 30 2006, 14:37) If ...   Nov 30 2006, 21:46
- - Leto Atreides II   I just noticed that mixer.exe still runs in the ba...   Dec 3 2006, 10:13
|- - d0gbert   QUOTE (Leto Atreides II @ Dec 3 2006, 03...   Dec 3 2006, 12:02
- - cervicek   I'm here again with the same problem... I thi...   Dec 6 2006, 17:12
|- - d0gbert   It works perfectly fine here with the 32bit versio...   Dec 7 2006, 19:33
|- - qristus   QUOTE (d0gbert @ Dec 7 2006, 19:33) The d...   Dec 22 2006, 14:24
|- - Dogbert   qristus, thanks for the info. The authenticode thi...   Dec 22 2006, 15:53
- - cervicek   You're right. I reinstalled Vista to 32bit and...   Dec 11 2006, 14:47
- - Dogbert   New release: 0.96. This release brings mainly imp...   Dec 17 2006, 00:04
- - kron   First of all, big thanks, really great driver, you...   Dec 18 2006, 21:42
|- - Dogbert   QUOTE (kron @ Dec 18 2006, 21:42) So is t...   Dec 18 2006, 21:54
||- - kron   QUOTE (Dogbert @ Dec 18 2006, 14:54) Ther...   Dec 21 2006, 10:04
||- - Dogbert   QUOTE Method one would mean not to take your drive...   Dec 21 2006, 12:19
|- - cervicek   QUOTE (kron @ Dec 18 2006, 21:42) I'm...   Dec 19 2006, 12:41
- - kron   I use it in Vista x86, and ac3 works perfectly wit...   Dec 19 2006, 16:37
|- - Dogbert   QUOTE (kron @ Dec 19 2006, 16:37) What do...   Dec 19 2006, 17:53
- - wdekler   First, a really big thank you for programming this...   Dec 21 2006, 15:51
|- - Dogbert   QUOTE (wdekler @ Dec 21 2006, 15:51) Has ...   Dec 21 2006, 17:25
|- - DualIP   [/quote] I haven't been able to get 24 bit out...   Dec 31 2006, 15:56
|- - Dogbert   QUOTE (DualIP @ Dec 31 2006, 15:56) AFAIK...   Jan 1 2007, 08:55
- - wdekler   It seems to work fine with the Terratec 5.1 FUN (8...   Dec 23 2006, 16:43
|- - Dogbert   QUOTE (wdekler @ Dec 23 2006, 16:43) I...   Dec 25 2006, 22:50
- - wdekler   Maybe we can also test it without a DAC? If we use...   Dec 25 2006, 23:15
|- - Dogbert   QUOTE (wdekler @ Dec 25 2006, 23:15) Mayb...   Dec 25 2006, 23:55
- - kron   Hi again, I tried the Winamp Kernel-streaming plu...   Dec 29 2006, 19:29
|- - Dogbert   QUOTE (kron @ Dec 29 2006, 19:29) Hi agai...   Dec 29 2006, 20:29
- - wdekler   I've seem to run into some trouble with the dr...   Jan 1 2007, 15:56
|- - Dogbert   QUOTE (wdekler @ Jan 1 2007, 15:56) I...   Jan 1 2007, 18:23
- - wdekler   Thanks for the advice! It's finally workin...   Jan 2 2007, 01:29
- - Sin Jeong-hun   Minimum level Maximum level Certified driver...   Jan 2 2007, 07:48
- - wdekler   I noticed that the driver sometimes generates outp...   Jan 2 2007, 14:03
|- - Dogbert   QUOTE (wdekler @ Jan 2 2007, 14:03) The W...   Jan 2 2007, 16:02
- - DualIP   Dogbert, I hooked up my oscilloscope to a CMI8738...   Jan 3 2007, 20:12
- - CiNcH   I am wondering why I have to switch to 2 channel o...   Jan 4 2007, 02:01
|- - Dogbert   DualIP, thanks a lot for your effort! The firs...   Jan 4 2007, 03:55
|- - DualIP   QUOTE (Dogbert @ Jan 4 2007, 03:55) offic...   Jan 4 2007, 05:40
|- - Dogbert   QUOTE Two datasheets I have (CMI8738_4ch_spec.pdf ...   Jan 4 2007, 15:54
- - CiNcH   Thanx for the explanation. I have now tried your ...   Jan 4 2007, 19:15
- - CiNcH   Ok, found a problem within 6-channel-mode (3/2+SW ...   Jan 5 2007, 17:37
|- - Egor   QUOTE (CiNcH @ Jan 5 2007, 22:37) Ok, fou...   Jan 5 2007, 21:20
|- - Dogbert   QUOTE (CiNcH @ Jan 5 2007, 17:37) Seems a...   Jan 6 2007, 18:22
- - DualIP   1) In my previous post in this topic, I reported t...   Jan 6 2007, 13:59
- - CiNcH   Don't think it is worth the time implementing ...   Jan 6 2007, 23:44
- - DualIP   I just tried the 0.9.9 driver and like the control...   Jan 10 2007, 11:19
|- - Dogbert   QUOTE (DualIP @ Jan 10 2007, 11:19) I jus...   Jan 11 2007, 16:47
|- - DualIP   found some issues in 1.0.0 : -in playback mixer, ...   Jan 17 2007, 10:13
|- - Dogbert   first of all, thanks for doing the cumbersome test...   Jan 18 2007, 14:17
|- - DualIP   [quote name='Dogbert' date='Jan 18 200...   Jan 18 2007, 17:54
|- - Dogbert   QUOTE I discovered this when I hooked up CDROM aud...   Jan 18 2007, 19:18
- - Dogbert   A new version (1.0.2) has been released.   Jan 31 2007, 21:36
|- - Dac   QUOTE (Dogbert @ Jan 31 2007, 21:36) A ne...   Feb 3 2007, 15:16
|- - Dogbert   QUOTE (Dac @ Feb 3 2007, 15:16) I'm t...   Feb 3 2007, 15:39
|- - Dac   QUOTE (Dogbert @ Feb 3 2007, 15:39) It lo...   Feb 3 2007, 19:49
|- - Any2   QUOTE (Dac @ Feb 3 2007, 12:49) It looks ...   Feb 3 2007, 20:06
- - Any2   Hello every time I have been installing CMI8738 6...   Feb 3 2007, 18:37
|- - Dogbert   QUOTE (Any2 @ Feb 3 2007, 18:37) every ti...   Feb 3 2007, 21:15
|- - Any2   QUOTE (Dogbert @ Feb 3 2007, 14:15) Thank...   Feb 3 2007, 21:51
|- - Dogbert   QUOTE (Any2 @ Feb 3 2007, 21:51) Yes, how...   Feb 3 2007, 21:54
|- - Any2   QUOTE (Dogbert @ Feb 3 2007, 14:54) Windo...   Feb 3 2007, 22:28
- - mugen   Can you make drivers for the ALC882M so I can get ...   Feb 4 2007, 09:12
- - Dogbert   QUOTE (mugen @ Feb 4 2007, 09:12) Can you...   Feb 4 2007, 11:09
- - wdekler   QUOTE (mugen @ Feb 4 2007, 09:12) Can you...   Feb 4 2007, 11:30
- - Dogbert   QUOTE (wdekler @ Feb 4 2007, 11:30) By th...   Feb 4 2007, 11:55
|- - Any2   QUOTE (Dogbert @ Feb 4 2007, 04:55) Dunno...   Feb 4 2007, 14:00
- - mugen   QUOTE (wdekler @ Feb 4 2007, 04:30) QUOTE...   Feb 4 2007, 12:03
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