[wdmaudiodev] Re: problem with MCStream.exe
- From: "Hager, Todd" <THH@xxxxxxxxx>
- To: "'wdmaudiodev@xxxxxxxxxxxxx'" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 29 Oct 2002 10:22:57 -0800
To make Tom's response easier to see, look at the data in rows of seven
columns (I hope the email formatting doesn't screw up my illustrative
example):
c0 c0 c0 c0 c0 c0 c0
bd b5 b5 b5 b5 b5 b5
b5 99 99 99 99 99 99
aa 74 74 74 74 74 74
9a 53 53 53 53 53 53
89 41 41 41 41 41 41
77 44 44 44 44 44 44
65 .....
All does seem to be fine...
-Todd
-----Original Message-----
From: Tom Eckert [mailto:teckert@xxxxxxxxxxxxxxxx]
Sent: Tuesday, October 29, 2002 10:09 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: problem with MCStream.exe
Tim,
I may not be getting this, but...
If the seventh b5 is the first (i.e. front left) sample of the third chunk
that it this case just happens to have the same value as the other channels
of the second chunk, it all looks OK. i.e. c0 c0 c0 c0 c0 c0 c0 bd b5 b5 b5
b5 b5 b5 b5 99 99 99 99 99 99 aa 74 74 74 74 74 74 9a 53 53 53 53 53 53 89
41 41 41 41 41 41 77 44 44 44 44 44 44 65 .....
- Tom
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx]On Behalf Of Tim Morris
Sent: Monday, October 28, 2002 6:27 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] problem with MCStream.exe
Hi folks,
I am having trouble with the MCStream app that comes with the DDK. If I
stream 500Hz sine waves on 7 channels (Front left/right, center, lfe, rear
left/right/center)in 8 bits at 22050Hz , the data that I get from portclass
in the Source buffer for CopyTo() seems to be correct. I get blocks of 7
identical samples. However, if I choose a 500Hz sine for the front left only
and 10KHz sines for all other channels, again at 8bits and 22050Hz, I get
the following data in my first Source buffer supplied to
CopyTo():
c0 c0 c0 c0 c0 c0 c0 bd b5 b5 b5 b5 b5
b5 b5 99 99 99 99 99 99 aa 74 74 74 74
74 74 9a 53 53 53 53 53 53 89 41 41 41
41 41 41 77 44 44 44 44 44 44 65 .....
I see two possible problems with this:
1.Seeing as the left channel is at 500Hz and all the others are at 10KHz, I
should see the left sample followed by 6 identical samples for each chunk.
It looks to me that either the first or second chunk has one sample too
many.(either chunk1 = c0 c0 c0 c0 c0 c0 c0 bd, or chunk2 = bd b5 b5 b5 b5
b5 b5 b5) 2.If the first chunk is the one with too many samples, then we
also have the problem that the differing sample is at the end of the chunck
rather than at the beginning, which means that the rear center is the
channel that differs from the others which should not be the case. Either
way this extra sample seems to be making quite a mess. So, am I crazy, or is
the app broken? It would be really useful if this app worked properly. Thanx
for any input. Tim.
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