Vorbis dev - Apr 2004 - encoding from 22050Hz source

Hi!
 
I'd like to encode from a 22050 Hz source wav file (only in that case),
but i get the following error message: "Invalid floating point
operation"
 
I use delphi:
 
vorbis_encode_init_vbr(vi,2,22050,0.5)
.
.
.
While (i < readCount div 4) Do
        Begin
          buffer[0][i] := smallInt((pArray(@readbuffer)[i shl 2 + 1] shl 8) or
pArray(@readbuffer)[i shl 2 + 0]) / 32768;
          buffer[1][i] := smallInt((pArray(@readbuffer)[i shl 2 + 3] shl 8) or
pArray(@readbuffer)[i shl 2 + 2]) / 32768;
   inc(i);
End
 
What could be wrong???
 
Thank you!
 
crc
 
 

                
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On Tuesday 20 April 2004 03:32, Crock Real wrote:
> Hi!
>
> I'd like to encode from a 22050 Hz source wav file (only in that case),
> but i get the following error message: "Invalid floating point
operation"
>
> I use delphi:
There could be some bug - particularly if you're using an older version of
the
libraries, but possibly in the current version - that is causing floating 
point exceptions. Usually, on x86 systems, these are turned off by default - 
perhaps delphi apps turn them on. You'll have to look at this in a debugger 
and tell us where it's happening, because it doesn't occur for most
users.

Mike

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>----- Original Message -----
>From: Crock Real
>To: vorbis-dev@xiph.org
>Sent: Tuesday, April 20, 2004 1:32 AM
>Subject: [vorbis-dev] encoding from 22050Hz source
>
>
>Hi!
>
>I'd like to encode from a 22050 Hz source wav file (only in that case),
>but i get the following error message: "Invalid floating point
operation"
>
>I use delphi:
>
>vorbis_encode_init_vbr(vi,2,22050,0.5)
>.
>.
>.
>While (i < readCount div 4) Do
>        Begin
>          buffer[0][i] := smallInt((pArray(@readbuffer)[i shl 2 + 1] shl 8)
or pArray(@readbuffer)[i shl 2 + 0]) / 32768;
>          buffer[1][i] := smallInt((pArray(@readbuffer)[i shl 2 + 3] shl 8)
or pArray(@readbuffer)[i shl 2 + 2]) / 32768;
>   inc(i);
>End
>
>What could be wrong???
My guess is that your floating point exception is a division by zero...
though from memory pascal at least doesn't allow integers to wrap around,
but i don't know about delphi.

But without seeing your types for your variables it's a bit hard to know
what's what... but if small int is a 16 bit signed integer and delphi wraps
integers then 32768 is out of range (-32768 <= 16bitint <= 32767)

I'm guessing 32768 becomes 0 and it's a division by zero. It should
really
be 32767.

Though that presents the problem that -32768/32767 will give you a float
< -1.0... you should just clip this to -1.0, that's the easiest way.

Zen.

<p><p>>
>Thank you!
>
>crc
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Hi!
 
I use libraries from the win32sdk-1.0.1. Is it ok?
 
My program halts at line:
 
 while(vorbis_analysis_blockout(vd,vb)=1) do
      Begin
->        vorbis_analysis(vb,op);  //"Invalid floating point
operation"
 //but not at once, only in the third loop...
And just then, when the source is 22050Hz...

:-(
?
 
Tank you!
 

                
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