Old 08-20-2017, 02:31 PM   #1
caseyjames
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Default Decoded VST parameter chunk

Though many vst's use custom chunk data - many also use the standard vst parameter format. Assuming ReaEq is one of those, I'm trying to decode the track chunk data to learn how to write it.

When I decode from base64 I get:

b'qeer\xee^\xed\xfe\x02\x00\x00\x00\x01\x00\x00\x0 0\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\ x02\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x0 2\x00\x00\x00\x00\x00\x00\x00\xa8\x00\x00\x00\x01\ x00\x00\x00\x00\x00\x10\x00!\x00\x00\x00\x04\x00\x 00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00 \x00\x00\x00Y@\x00\x00\x00\x00\x00\x00\xf0?\x00\x0 0\x00\x00\x00\x00\x00@\x01\x08\x00\x00\x00\x01\x00 \x00\x00\x00\x00\x00\x00\x00\xc0r@\x00\x00\x00\x00 \x00\x00\xf0?\x00\x00\x00\x00\x00\x00\x00@\x01\x08 \x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00@\ x8f@\x1a\xa5\x1f\xff\x06d\xfc?\x00\x00\x00\x00\x00 \x00\x00@\x01\x01\x00\x00\x00\x01\x00\x00\x00\x00\ x00\x00\x00\x00\x88\xb3@\x00\x00\x00\x00\x00\x00\x f0?\x00\x00\x00\x00\x00\x00\x00@\x01\x01\x00\x00\x 00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf0?\x0 0\x00\x00\x00\\\x02\x00\x00\x91\x01\x00\x00\x00\x0 0\x10\x00\x00\x00'


Are the \x02 etc the parameter values for the sequence of VST parameters? Any idea on how I can insert simple VST's into a project, without using the RPR_TrackFX_SetParam type params that only work when running scipts inside Reaper?
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Old 08-20-2017, 09:55 PM   #2
mschnell
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Been there some time ago, but don't remember details.

There once was a thread about decoding VST data (supposedly in this Forum). I posted several examples there.

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Old 08-22-2017, 05:12 PM   #3
caseyjames
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I went through everything I could find. Here's what interpret according to this thread : https://forum.cockos.com/showpost.ph...&postcount=172

VSTID - "bver", "mosr"
magic - "238^\237\254" consistent across all vsts
inputs - "002" "000"

This seems to be the input and output routing, but I don't know there is so much variation for a simple 2in/2out:
\002\000\000\000\001\000\000\000\000\000\000\000\0 02\000\000\000\000\000\000\000\002\000\000\000\001 \000\000\000\000\000\000\000\002\000\000\000\000\0 00\000\000\184\000\000\000\001\000\000\000\000\000 \016\000\000\000\000\193\

\193 seems to be the end of the routing for Reaverb but I don't see it in any other vst chunks.

My main interest is separating out the standard VST automatable parameters from the actual vst chunk data. Here I sent the first to Reaverb parameters to max/min and then min max. How do I interpret those values as floats?

225\201~@\000\000\000\000\000\000\000\000\000\000\ 128?
000\000\000\000\225\201~@\000\000\000\000\000\000\ 128?

The first two chunks are both Reaverb where I'm altering the first two parameters wet and dry to see where they show up in the chunk.


val g : string =
"bver\238^\237\254\002\000\000\000\001\000\000\000 \000\000\000\000\002\000\000\000\000\000\000\000\0 02\000\000\000\001\000\000\000\000\000\000\000\002 \000\000\000\000\000\000\000\184\000\000\000\001\0 00\000\000\000\000\016\000\000\000\000\193\225\201 ~@\000\000\000\000\000\000\000\000\000\000\128?\00 0\000\128?\000\000\000?\000\000\000\000\000\000\00 0\000FILELDR\000\136\000\000\000\012\000\000\000/home/mypath/test_IR.wav\000\000\000\000\000\016\000\000\000"


val g2 : string =
"bver\238^\237\254\002\000\000\000\001\000\000\000 \000\000\000\000\002\000\000\000\000\000\000\000\0 02\000\000\000\001\000\000\000\000\000\000\000\002 \000\000\000\000\000\000\000\184\000\000\000\001\0 00\000\000\000\000\016\000\000\000\000\193\000\000 \000\000\225\201~@\000\000\000\000\000\000\128?\00 0\000\128?\000\000\000?\000\000\000\000\000\000\00 0\000FILELDR\000\136\000\000\000\012\000\000\000/home/mypath/test_IR.wav\000\000\000\000\000\016\000\000\000"

val j : string =
"mosr\238^\237\254\000\000\000\000\002\000\000\000 \001\000\000\000\000\000\000\000\002\000\000\000\0 00\000\000\000!\001\000\000\001\000\000\000\000\00 0\016\000\000/home/mypath/timiditytest.wav\000\000\000\000\000\000\000\240?\ 000\000\000\000\000\000\224?\000\000\000\000\000\0 00\240?\000\000\000\000\000\000\000\000\000\000\00 0\000\000\000\240?\154\153\153\153\153\153\177?\20 5\204\204\204\204\204\235?\000\000\000\000\000\000 \000\000\154\153\153\153\153\153\201?\252\169\241\ 210Mb@?\252\169\241\210Mb@?\000\000\000\000\000\00 0\000\000\000\000\000\000\000\000\000\000\000\000\ 000\000\000\000\000\000\000\000\000\000\000\000\24 0?\000\000\000\000\000\000\224?\001\000\000\000\00 0\000\000\000\000\000\000\000\000\000\000\000\000\ 000\240?@\000\000\000UUUUUU\197?\255\255\255\255\0 00\000\000\000\000\000\000\000\000\000\000\000\000 \000\240?\000\000\000\000\000\000\240?\000\000\000 \000\000\000\000\000\000\000\000\000\000\000\000\0 00\000\000\000\000\000\000\000\000\000\000\000\000 \000\000\000\000\206\164!!\026e\144?\000\000\000\0 00\000\000\240?\252\169\241\210Mb0?\000\000\000\00 0\000\000\000\000\000\000\000\000\016\000\000\000"
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Old 08-23-2017, 02:01 PM   #4
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After decoding the save chunks for a bunch of vsti's, I'm getting a sense of how different they are.

My assumption was that the automatable float parameters would be stored in a consistent format.

Is it that the vst api is what is consistent - where a vsti knows how to hand floats to the host and how to save a chunk, but the host only stores parameters with actual automation envelopes?

A few of the chunks seem to be xml/text but the majority seem to still be encoded like \000\000\000\000 are those floats, or is it more arbitrary?
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