32 lines
1.7 KiB
Markdown
32 lines
1.7 KiB
Markdown
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# hootopna
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This script converts a [Hoot](http://snesmusic.org/hoot/v2/) memory dump into an .opm instrument pack, suitable for the VOPM VST plugin. It's an extremely rudimentary way of extracting FM instruments from games, but it works.
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## Usage
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`./hootopna.py -t chip_type input_file`
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Output is dumped straight to stdout; redirect it to a file if you want to save it.
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### Currently-supported chip types
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* OPM
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* OPN
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* OPNA (equivalent to OPN)
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## Capturing memory in hoot
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* Left- and right-clicking the "driver work" area flips between available memory pages. Scrolling the wheel in this area scrolls through the current page; you can also use Ctrl-(Up/Down/PgUp/PgDn) for this purpose.
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* When you see the area you need to capture, use Ctrl-C to copy it to the clipboard. This copies the entire page to the clipboard in a human-readable format, with 16 comma-separated hex bytes per line (plus a comma at the end for whatever reason, but this is ignored).
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* Paste this into a file, trimming it down to get the register area of the FM sound chip. Save it as whatever.
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### Tips
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* Most chips (read: all of the ones currently supported by this script) have a 256-byte register area, meaning you'll need to trim it down to 16 lines.
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* From what I've seen, the chip's register area almost always resides on the first page, starting either at 0x0000 or 0x0100.
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## Known issues
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* Since the script looks at a simple static memory dump, it has no way of capturing certain data, instead replacing it with placeholders. These include:
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* LFO data
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* Operator on/off state; all operators are considered to be in use (this *could* potentially be inferred, though)
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* Panning, though VOPM doesn't seem to use this
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