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Software to verify EAC log CRC's
Alexxander
post Feb 21 2007, 10:12
Post #26





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QUOTE (JoyO @ Feb 20 2007, 21:30) *
Here is temporary solution (works for most logs):

CODE
@echo off

rem crc1632 - http://www.mirkes.de/en/freeware/batch.php
set flac="E:\TEST\flac.exe"
set crc1632="E:\TEST\crc1632.exe"

rem takes first parameter as path to log and flac files
cd "%1"
%~d1

for %%f in (*.flac) do (
echo %%f
%flac% -d -c -f --totally-silent --force-raw-format --endian=little --sign=signed "%%f" | %crc1632% /m32
)

IF errorlevel=1 GOTO fail

for %%f in (*.log) do (
rem opens .log in notepad, to open in default app for .log files chage next line to: "%%f"
notepad.exe "%%f"
)

IF errorlevel=1 GOTO fail
GOTO end
:fail
echo.
echo Sth is wrong.
echo.
pause
:end
rem uncomment next line to prevent cmd window from closing
rem pause


Save as .bat and use in foo_run, total commander, windows explorer or any other tool tongue.gif
Could be 100% effective if I would know some way to compile Triza code. Maybe I will make own tool for this in c, for now this must be enough smile.gif

Edit: small fix - added %~d1 to change drive.


Nice script. I tried it on flac ripped albums and it calculates nicely CRC's but the results aren't identical to the CRC's in the EAC logfile. I suppose the CRC's are different because in EAC I rip with the option "No use of null samples for CRC calculations" marked (EAC Options >> tab Extraction).

This post has been edited by Alexxander: Feb 21 2007, 10:27
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JoyO
post Feb 21 2007, 14:57
Post #27





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This issue I think could be solved quiet fast and easy. We need to add another pipe before passing stream to crc1632, like
-sign=signed "%%f" | CLEAN.EXE | %crc1632% /m32
where CLEAN.EXE would be simple program that reads data from stdin, removes 0000 (not sure here as I dont have any flac file created with checked eac "No use of null samples for CRC calculations" option.) and writes to stdout. This should be a few lines of code. However, I need some some flac file to test it.
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greynol
post Feb 21 2007, 19:01
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Assuming 0000 means left-channel sample and right-channel sample (LLRR), your cleaning concept isn't going to duplicate EAC's method of CRC generation.

Your method must also change 00XX or XX00 to XX.


Never mind. You're correct, 0x0000 represents a 16-bit null sample in a single channel. blush.gif

This post has been edited by greynol: Feb 21 2007, 22:27


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dmvn
post Feb 19 2008, 19:36
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From: Russia, Moscow
Member No.: 30836



Wow! I see people try to solve the problem that was solved months ago...
Please have a look here... I think this helps, no?
http://www.hydrogenaudio.org/forums/index....showtopic=57306

greynol asked me to provide a kind of console tool that can easily calculate all variants of CRC, & i think i can help, i know all the truth and already have (maybe some fixes will be necessary to support stdin) some C code...

PS very sorry for my english.

This post has been edited by dmvn: Feb 19 2008, 19:37
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