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Gustav Zhuravlev
Gustav Zhuravlev

How to Update Your C-Media CMI8738/C3DX PCI Audio Device with CMI8738 PCI 6CH MX HRTF 3D Audio Driver


i have no idea what this is, so that shouldn't be too much of an issue. failing that, i can always ask around the forum, but i doubt anyone there has experience with the cmi8738. one thing i can tell you is that when i took a look at the correct port on your motherboard (the floppy drive port, assuming of course that this is a real floppy drive), i do not see any command or control bits. if anyone knows for certain what it is, that would be nice to know.




cmi8738 pci 6ch mx hrtf 3d audio driver download


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what i'm looking for is a byte-to-word conversion routine. the routine i found references to port 220. the byte-to-word routine is used to convert bytes to words within the cmi8738 itself (e.g. to convert the fm signals to sample values). i think my driver overwrites the 0x42404 byte, which is what triggers the fm hardware.


i haven't tested my driver on an actual cmi card yet. obviously the codebase for the drivers is not the same as the drivers on the internet. maybe you could contribute a patch to the driver in order to get it working? if you did that, i would be more than happy to compile a regular driver.


there is no defined structure for the codec register values. there is a table mapping the codec#3 values (this should match the codec#2 bitmask in the card) to offsets in the builtin 3d positional audio. i don't know if this is correct, as i can't find any documentation about this.


the bits that you need to check are the last 4 bits of the cmp_sample_table[] array. you can calculate the sample value yourself by masking out the bits you don't need, then bitwise and'ing your 3-byte sample data with the resultant value.


https://www.buildfullbodyarmors.com/group/mysite-200-group/discussion/58bc1c0a-f173-4998-b3e3-4e0b7e0c8f1a

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