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- Subject: Any tips on 2 process vinyl to file converter?
- From: Steve Litt <slitt@...>
- Date: Wed, 26 Jan 2011 18:30:33 -0500
I implemented a 2 process vinyl to file converter to convert all my 45 rpm
records. The reason for 2 processes is I want to input record metadata while
the record is playing, converted to wav and then flac and ogg. Having
digitization wait for my input would almost double the required time.
Each process must show up on the screen (CLI). The metadata input process
needs to be visible in order to input the data. The digitization process needs
to be visible so I can press Ctrl+C at the end of the song (no reliable way to
detect the song's end).
The shellscript version works like this:
METADATA INPUT LOOP PROCESS
until user done
Get metadata from user
Write metadata to file
Push the filename on persistent queue
DIGITIZER/CONVERTER LOOP PROCESS
until queue empty
Shift the filename
Read the metadata file
Digitize the record
Normalize the file
Create flac, mp3 and or ogg
Notice that the digitizer process polls the queue. I'd like the input process
notify it every time a new file is pushed on the queue, but it was tough using
I'm thinking of redoing this in Lua. Can coroutines be run in two different
xterms? Can coroutines signal each other? Would you even recommend coroutines?
Does Lua have facilities to send Linux signals? Might they communicate via
sockets? Any other words of wisdom?
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