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Content starts here
                     Compaq Multimedia Services
                     for OpenVMS Alpha
                     Release Notes

                     April 2000

                     Revision/Update Information:

                     Operating System:            OpenVMS Alpha, Version

                     Software Version:            Compaq Multimedia Services
                                                  for OpenVMS Alpha,
                                                  Version 2.2

                     Compaq Computer Corporation


           April 2000

           Copyright 2000 Compaq Computer Corporation.

           COMPAQ Registered in U.S. Patent and Trademark Office.

           Microsoft, Windows, and Windows NT are registered trademarks
           and Visual C++ is a trademark of Microsoft Corporation in the
           United States and/or other countries.

           Motif, OSF/1, UNIX and the "X" device are registered trademarks
           and IT DialTone and The Open Group are trademarks of The Open
           Group in the United States and/or other countries.

           Confidential computer software. Valid license from Compaq or
           authorized sublicensor required for possession, use or copying.
           Consistent with FAR 12.211 and 12.212, Commercial Computer
           Software, Computer Software Documentation, and Technical Data
           for Commercial Items are licensed to the U.S. Government under
           vendor's standard commercial license.

           Compaq shall not be liable for technical or editorial errors or
           omissions contained herein.  The information in this document is
           subject to change without notice.

           The information in this document is subject to change without
           notice and is provided "AS IS" WITHOUT WARRANTY OF ANY KIND. THE
           OF SUCH DAMAGES.

           The limited warranties for Compaq products are exclusively set
           forth in the documentation accompanying such products. Nothing
           herein should be construed as constituting a further or additional



This document contains the release notes for Compaq Multimedia Services V2.2
for OpenVMS.

This document is supplied in text form. You can find the release notes in the
following locations:


Associated Documents:
o 	Compaq Multimedia Services for OpenVMS Alpha Installation Guide
o       Compaq Multimedia Services for OpenVMS Alpha Run-Time Environment
o 	Compaq Multimedia Services for OpenVMS Alpha Programmer's Guide
o 	Software Product Description (SPD 64.24.02)

Table of Contents

Product Summary
About This Document
About This Release
        Information not Documented
        ATAPI CD-ROM Audio Support
        CD-ROM Audio Output Connection
	Unofficial Support for Personal Workstation Audio
Known Problems
	Compatibility Issues
	General Problems and Restrictions
	Waveform Audio Problems and Restrictions
	Microsoft Sound Board Audio Problems and Restrictions
	Sample Code Problems and Restrictions

Product Summary

Compaq Multimedia Services V2.2 for OpenVMS Alpha contains support for the
following operating systems:

o 	OpenVMS Alpha Version 7.1-2
o       OpenVMS Alpha Version 7.2-1 and higher

About This Document

This document contains information which is included in the official product
documentation. Please read these release notes thoroughly before attempting
to install or use Compaq Multimedia Services V2.2 for OpenVMS Alpha.

About This Release

The main focus of this release is audio support for currently shipping
OpenVMS workstation platforms.

Support is provided for these options:

o       Compaq Creative Labs AudioPCI Card (also referred to as the
             Compaq Ensoniq AudioPCI Card) on the AlphaStation XP900 (DS10)
             and the AlphaStation XP1000.

o       AlphaStation Sound Card (also known as the Microsoft Sound Board,
             and referred to as the MSB device) on the DIGITAL Personal
             Workstation 600au, and on previously shipped AlphaStation

Previously provided video components continue to be provided, but no new
features have been added.

Runtime Kit

The runtime kit is available

o 	On the OpenVMS Software Product Library (Layered Product CD)
o 	As a Factory Installed (FIS) option

The runtime kit provides:

o 	Runtime support for:
	o 	Audio Record and Playback services
	o 	Audio Codec services

o 	Utility client applications (in executable form only)
	o 	DECsound - an audio record, playback, and edit utility
	o 	Audio Control - a utility to control volume and port selection
		for all audio devices
	o 	audioplay - a command line only audio playback utility
	o 	audiorecord - a command line only audio record utility
o 	Sample audio data
o 	Installation Verification Procedure
o 	Help for runtime components

Development Kit

The development kit is available

o 	On the OpenVMS Software Product Library (Layered Product CD)
o 	As a Factory Installed (FIS) option

The development kit includes the runtime kit and also provides:

o 	Header files needed to develop applications and products
o 	Sample application programs (in source form)
o 	Object libraries needed to develope applications and products

Information not Documented in the Runtime Guide or Programmer's Guide

ATAPI CD-ROM Audio Support

o       The exiting tools for CD-ROM audio, such as DECW$CDPLAYER, function
        only with SCSI CD-ROM devices.  A future version of OpenVMS and
        DECwindows are expected to include support for ATAPI CD-ROM audio.
        In the interim, ATAPI CD-ROM audio support may be made available
        on the OpenVMS Freeware disk.  For more detail, see the following URL:


CD-ROM Audio Output Connection

o       Some CD-ROM drives are equipped with an 1/8" headphone jack and volume
        control on the front of the drive for CD-ROM audio output.  However,
        the feature may not exist on all drives.  CD-ROM audio
        output is still possible provided the CD-ROM audio output port
        (located at the back of the CD-ROM) is cabled to a CD AUDIO IN port on
	a sound card.  Select the Audio Control "Mix CD" port to
        enable CD-ROM audio to pass into the Compaq Creative Labs AudioPCI
        sound card.

Unofficial Support for the Personal Workstation Audio Device

o       The file MMOV$ESSDRIVER.EXE has been placed in the Runtime Kit.  This
        kernel driver has not been qualified and is not officially supported
        at this time.  This driver will not be loaded and "enabled" by the
        operating system unless the following entry is placed in the
        sys$common:[sysexe]sys$user_config.dat file:

             device  = "ES1888 Sound Card"
             name    = AU
             driver  = MMOV$ESSDRIVER
             adapter = XBUS
             id      = ES1888

	The mmov$essdriver provides "msb emulation" mode operation.  This means
        that Compaq Multimedia Services applications operate as if the
        Personal Workstation built-in device were a Microsoft Sound Card.
        Note that Compaq Multimedia Services will not work properly if both
        the mmov$msbdriver and the mmov$essdriver are enabled.

Known Problems

This section lists the known problems with this release of Compaq Multimedia
Services for OpenVMS.

Use of Multiple Sound Drivers Simultaneously Not Currently Supported

Attempting to use more than one sound device may cause an application to
operate incorrectly.  If more than one sound device is present on your system,
you can prevent the Multimedia Services MMOV$SERVER program from using a
device by removing an entry from the sys$system:system.ini file.

 wave=mmov$ensaudio  Enables the Compaq Creative Labs (Ensoniq) Audio Device
 wave=mmov$msbaudio  Enables a Microsoft Sound Board or compatible or an
			MSB emulation device.

Continuous Playback Longer than Three Hours Fails

After playing sound for about three hours, the output goes silent.  The kernel
driver is still operating the dma, but no new data is loaded to be played.  To
resume playback, it is necessary to shutdown the server and restart the
server.  (Run @sys$startup:mmov$shutdown and @sys$startup:mmov$startup).

XToolkit Warning Messages

The X-windows applications sometimes issue XToolkit warning messages.  The
applications operate properly however, so these messages may be ignored.

Compatibility Issues

Note that any non-Multimedia application using one of the multimedia
kernel drivers cannot be run at the same time the Multimedia Server is
running.  Since driver interfaces compatible with SYS$MSBDRIVER will not
be maintained for future devices, Digital recommends that any sound
applications using SYS$MSBDRIVER be re-written to use the Compaq Multimedia
Services API.

General Problems and Restrictions

o 	The Multimedia Services library has debugging messages enabled which
	may be printed to SYS$OUTPUT. These messages are intended to help the
	user diagnose a problem that might have occurred in the library.
	Please submit a problem report if these messages appear.

Waveform Audio Problems and Restrictions

This section describes problems and restrictions in the waveform audio
services along with work-arounds for the problems where known.

o 	The volume reported through the waveIn/OutGetVolume is slightly less
	than the volume set through the waveIn/OutSetVolume.

o 	When recording audio, ensure that the recording volume is set at an
	optimal level because if the input volume is high (either due to a
	setting or due to the input source), the recording might be

	Use the VU Meter in Audio Control to check if input volumes exceed
        the amplitude levels that the device is capable of handling without

o	When recording data, if applications do not queue buffers to the
	mmeserver before the data is available for recording, the audio
	devices must handle the data in some manner. The different audio
	devices do not handle this condition in the same way.

o       All audio devices will discard data if there are no application
        buffers available for recording, always keeping the data returned

o 	Sometimes a user may experience a problem with noise on MSB and
	other systems using Microsoft window sound systems, with a microphone
	plugged in.

        An MSB card using an Analog devices 1848K that has a microphone
        plugged in, passes audio  from the microphone through to the audio
        output but the audio is very distorted. This can happen  with the
        machine in any state as long as it is powered up. On the AlphaStation
        200 and  AlphaStation 250 systems with the internal speaker hooked up,
        the distorted sound will come out  the speaker.

Sample Code Problems and Restrictions

o	All sample code needs to be run in an account with SYSNAM privilege,
	or the sample code executable needs to be installed with SYSNAM

o       AVIRECORD does not always produce a valid AVI file.  There seems to be
        a timing problem in the code which causes the program not to recognize
	the fact that data was captured.  Therefore the program believes that
        no valid data was captured and does not produces a valid AVI file.


	Disk I/O on OpenVMS seems to be the number one culprit that hinders
performance. You will see a noticeable gap in writing audio buffers
to disk every time OpenVMS needs to preallocate more space. There are a few
disk values that can affect performance that a user may set themselves.


	This value affects the number of blocks that are allocated for each
I/O buffer. Someone with privileges may set this value system wide so all I/O
operations utilize the new value. This value is hard coded into the sample
code AVIRECORD.C and within the MMIO routine mmioOpen(). The line of code for
this open statement is coded as follows:

	file = open(Filename,openflags,0600,"ctx=stm","mbc=127");

	The ctx value specifies stream mode and the mbc value specifies
the RMS_DEFAULT BLOCK_COUNT for this file.

	You will also see in the sample code AVIRECORD.C the pre-extending of
a file before recording.  This achieves much better performance with the
exception of a few drawbacks. The line of code is in there, but is commented
out. If you search for the open function call you can see the other open

	This line is currently being used.
	rawFile = open(Filename,openflags,0600,"ctx=stm","mbc=127");

	This is the open function that's commented out.
	rawFile = open(Filename,openflags,0600,"ctx=stm","mbc=127",

        The "alq" parameter says to pre-extend the file to this many blocks.
        The "deq" param says to extend by this many blocks when the initial
        size has run out and the "fop=tef" says to truncate the file on close.
        This gives good performance just as long as you pre-extend the file by
        the amount you plan to record. If you do need more than you initially
        set up for you will take a huge hit of many seconds if the system
        needs to pre-extend the file more.