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Osprey Video Division
ViewCast Corporation

Osprey-500 Capture Driver
	

For Windows XP 
Release 2.2.1 Update, Patch 5
6/7/2004

  
This document includes updated information for Release 
2.2.1 Update Patch 5 of the Osprey-500 Capture Driver. For
more information on this Osprey card and other Osprey
products, visit the Osprey web page, www.ospreyvideo.com.


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This patch contains the following files:
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o5ca_usr.dll
readme.txt


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This patch contains the following fix:
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Audio boost factor and volume level calibration have
been improved:

1.  The old registry based software boost factor named 
    "Gain" is obsolete and no longer has any effect.
    This factor did not work correctly on all products,
    and was not calibrated across different products.

2.  The new boost factor defaults now result in consistent 
    volume levels across different Osprey products.  Also,
    the same boost and calibration scheme is used by the 
    Osprey AVStream drivers.

3.  The driver has internal defaults that should be correct
    for nearly all users.  However, these can be overridden 
    by DWORD variables in the registry.  Experienced users
    can use the following information to override them.
    Contact Osprey support for further assistance.

4.  For analog inputs, there are hardware factors that 
    set the input reference level.  (The Osprey-200 does not
    have a hardware boost adjustment.)

    - HwBoostUnbalanced range is -23 to  +3, default -10.
    - HwBoostBalanced   range is -15 to +12, default   4.

5.  For all inputs, a software boost factor can also be applied.
    All software boosts except the Osprey-200's have an 
    internal default of 0, and range from -32 to +31.  The
    Osprey-200's has an internal default of 7, range -32 to +31.

6.  The location of the variables is:

    HKCU\Software\Osprey\Osprey???\Device?\Audio.

    - "Osprey???" is "Osprey200", "Osprey500", "Osprey540", 
      or "Osprey2000".

    - In "Device?", '?' is the zero-based device number.

    These variables are initially not present, 
    and the VfW driver never creates or modifies them.

7.  The variable names are as follows - only variables that
    correspond to audio inputs on your Osprey product are 
    meaningful:

    - SwBoostUnbalanced
    - SwBoostBalanced
    - SwBoostAesEbu
    - SwBoostRcaSpDif
    - SwBoostOptSpDif
    - SwBoostSdi
    - SwBoostDv1394

    - HwBoostUnbalanced
    - HwBoostBalanced

    All are of unsigned DWORD variable type.  To set a negative
    value, enter a large hexadecimal unsigned word:

    -1  is 0xFFFFFFFF
    -10 is 0xFFFFFFF6

8.  Changes take effect when you restart the application.



Contact information:
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voice:   888-684-6622
fax:     919-319-9814
email:   support@ospreyvideo.com
website: www.ospreyvideo.com