PLz forgive if you see this twice, outlook web access is tormenting me further
-----Original Message-----
From: Takashi Iwai [mailto:tiwai@xxxxxxx]
Sent: Fri 2/23/2007 7:19 AM
To: John Utz
Cc: alsa-devel@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: Is there a convention for mapping codec vendor's register::bit names to alsa control names?
At Thu, 22 Feb 2007 10:04:20 -0800,
John Utz wrote:
>
> * If no, we can hardcode these bits in the initialization sequence.
>
> these bits form a matrix that configure some combinations of mic ins, line ins and
> surround outputs.
>
> In the case of somebody that has a full collection of plugins/plugouts, their surround
> output might not work as expected.
>
> And, that person might want to sometimes change the line in and the speaker out to be
> more mic inputs.
>
> So surfacing flexibility to the end user is important.
>
> The problem with surfacing this is that matrix is pretty hard to follow:
>
> 1. the doc has some bugs; ie SM51 and SMIC are not the names of the bits
>
> 2. the collection of choices is so strange that it looks like the result of running a
> gate minimization program instead of choosing the matrix based on user need :-)
>
> Controller Bit MICIN I/O
> SM51 SM51SW SMIC 20XL 20XR MIC1 MIC2 MIC3 LL LR
> 0 0 0 MIC1 MIC1 MIC1 - - LL LR
> 0 0 1 MIC1 MIC3 MIC1 - MIC3 LL LR
> 0 1 0 MIC2 MIC2 - MIC2 - LL LR
> 0 1 1 MIC1 MIC2 MIC1 MIC2 - LL LR
> 1 0 0 MIC3 MIC3 CEN LFE MIC3 SURL SURR
> 1 0 1 MIC3 MIC3 CENT LFE MIC3 LL LR
> 1 1 0 MIC1 MIC1 Mic1 LFE SURL SURR
> 1 1 1 MIC1 MIC2 MIC1 MIC2- LFE SURL SURR
>
> If somebody can make sense of this by assigning a simple meaning to each input bit in
> this karnaugh map then i'd welcome that insight!
>
> However, having looked at this for several hours, I think this is already minimized.
* Well, too minimized to understand quite what they mean :)
* Could you explain a bit more detail?
yes, certainly! this matrix is called 'Mixer Table'
The bit's are as follows, complete with documentation mistakes :
SM51 is a mistake, it's listed in the docs as SM51EN. it has a 1 line decription:
'Smart 5.1 feature (See Mixer Table)'
SM51SW is corrent, it has a 1 line description:
'Smart 5.1 feature (See Mixer Table)'
SMIC is a mistake, it's listed in the docs as MS, it has a 1 line description:
'Microphone Select (See Table Below)'
20XL i have NO IDEA what this is.
20XR i have NO IDEA what this is.
MIC{1,2,3} i ASSUME are routing for different mic inputs
L{L,R} i am pretty sure is Line In Left and Right
S{L,R} is Surround Left and Right
CEN and LFE are Center and Low Frequency Enhancement
These are the different choices in the matrix, i dont like the idea of arbitrarily picking a setup that turns on surround and ignores the other choices.
My current code surfaces all 3 bits:
AC97_SINGLE("Smart 5.1 Control A", 0x20, 8, 1, 0),
AC97_SINGLE("Smart 5.1 Control B", 0x7a, 15, 1, 0),
AC97_SINGLE("Smart 5.1 Control C", 0x7a, 14, 1, 0)
I havent come up with any better idea.
tnx for any thoughts you may have.
johnu
* Takashi
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