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in_CDReader.txt
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2003-06-27
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What is CD Reader plugin?
~~~~~~~~~~~~~~~~~~~~~~~~~
CD Reader is a freeware WinAmp plugin to play music CDs with exceptional
quality.
Why CD Reader better than standard WinAmp CD plugin ?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Here is why:
1. Improved read quality, much closer to 100%.
2. Ability to use quality DAC of your audiocard. (Many CD-ROMs have only
12-bit DAC)
About 1st clause. All players play CDs by reading data sectors once,
one by one, continuously. No any reread on defect sectors occurs. This caused
by many reasons. Method of playing CDs was born when maximum available reading
speed was 1x. It's a very hard to find CDDA sector to reread it, because of
poor CDDA navigation system (original guaranteed precision is about 0.5 sec).
Computer program using good 6x CD drive can eliminate these obstacles. So,
read quality can approach to 100%. You can ask: "How about my Data-CDs? It's
all read fine on my CD-ROM. And how CD-ROM reread sectors on my Data-CDs?"
That's true. But thanks to improved Data-CD navigation system and additional
error correction layer. Difference is huge, here is about 100Mb of efficient
data payoff.
How is it work ?
~~~~~~~~~~~~~~~~
CD Reader plugin uses RAW_READ function (also known as 'read long') to
extract digital audio data from CD. So, your CD-ROM drive must have such
capability. CD Reader plugin can use two low level interfaces to perform this
function - ASPI and Win32. ASPI is Windows 95/98 embedded interface. Windows
NT have not this interface installed by default. However, you can install it
separately. From other hand Windows NT have naitive low level interface -
Win32, you can use it without installing any additional software. But, some
CD-ROMs does not support RAW_READ function thru Win32 and do well it thru
ASPI.
No any position de-jittering performed. All code relies on modern
CD-ROM drives and drivers. Because, most of old CD-ROM drives which able to
read raw data from media, unable to do it on sufficient (real time, 1x at
least) speed.
How to use it?
~~~~~~~~~~~~~~
Be sure you use WinAmp 2.0 or higher. Then simply copy
'in_CDReader.dll' to WinAmp\Plugins directory. Don't forget to shutoff
original WinAmp CD plugin by changing its extension, for example
'in_cdda.dll.off'. Now you can try to play CD. If "Your CD-ROM does not
support RAW_READ function" dialog box appears - bad luck, you can't use this
plugin. If player report "Buffer size too big to handle", try to reduce buffer
size down to one sector. Some CD-ROMs capable of read CDDA only by 1 sector.
More sectors in buffer - better skip protection, less CPU use. Fewer sectors
- faster seek response and more CPU use. If you have more than one CD-ROM,
ensure to set right "ASPI device" option in setup. You can get faltering
sound. This caused by poor read speed that in its turn can be caused by bad
media or CD-ROM drive.
CDDB
~~~~
In this version of CD Reader plugin is able to read information about
CD in drive from CDDB Internet server which contain song names and other stuff
for wide variety of CD's. Click on CDDB tab to make CDDB settings. CD Reader
plugin is able to cache CD information. To enable this feature click 'Use
local CDDB' checkbox. Cached information will be kept in cdplayer.ini file
which located in main Windows folder.
License agreement
~~~~~~~~~~~~~~~~~
None of the executable modules or the documentation of CD Reader plugin may be
modified in any way.
All rights to CD Reader plugin belong to Vladimir Kopjov. You may use this
product only in accordance with the restrictions listed in this license
agreement.
CD Reader plugin is distributed on the "AS-IS" principle without any
warranties or pledges.
This software may be used freely only with WinAmp(tm), and may not be copied,
sold, distributed or used for any other purpose without the prior written
Vladimir Kopjov's consent.
The author bears no responsibility for any damage or loss of data resulting
from the use or misuse of CD Reader plugin.
The author does not assume any obligation to inform anyone about new versions
of the software, nor about any additions or modifications.
The use of CD Reader plugin means nothing more than your acceptance of this
license agreement.
Support freeware
~~~~~~~~~~~~~~~~
Really like this plugin ? You can support the author by sending _any_
music CD (may be one you want to throw out) to:
620144
55 Kuibyshev st.
Ekaterinburg, Russia
PARAD Vladimir Kopjov
Contacts
~~~~~~~~
E-mail: copah@parad.ru
WWW: http://www.url.ru/~copah/