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Reading Loop points from WAV file - possible?
13 posts
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Reading Loop points from WAV file - possible?
Hi,
I have a lot of WAV files with loops (made them for my Kontakt sample libraries), some of which I would like to use for my FS project. I was searching forum on this subject, but no luck.
Can anyone, please clarify if it is possible for FS to recognize WAV Loop points? If not - what would be possible solution?
Thanks!
Ray
I have a lot of WAV files with loops (made them for my Kontakt sample libraries), some of which I would like to use for my FS project. I was searching forum on this subject, but no luck.
Can anyone, please clarify if it is possible for FS to recognize WAV Loop points? If not - what would be possible solution?
Thanks!
Ray
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Julian Ray - Posts: 23
- Joined: Tue Jun 18, 2019 2:58 pm
- Location: CANADA
Re: Reading Loop points from WAV file - possible?
Assuming the loop points are stored in the standard way for a WAV file, then yes it's possible - but not especially easy.
Ruby can read files as raw bytes, and then decode them into whatever kind of data they represent; so if you know how a file format is laid out, it's possible to decode just about anything.
I have had a play at decoding WAV files in the past, though I didn't gt particularly far. Below is the old project file, which you're free to cherry-pick if its at all useful to you - it'll give you a sense of what you'd be letting yourself in for, at least! From a cursory look, I can't tell exactly which chunks of a wav its able to read - you might get lucky and see your marker/loop data, or you might not - good luck!
Ruby can read files as raw bytes, and then decode them into whatever kind of data they represent; so if you know how a file format is laid out, it's possible to decode just about anything.
I have had a play at decoding WAV files in the past, though I didn't gt particularly far. Below is the old project file, which you're free to cherry-pick if its at all useful to you - it'll give you a sense of what you'd be letting yourself in for, at least! From a cursory look, I can't tell exactly which chunks of a wav its able to read - you might get lucky and see your marker/loop data, or you might not - good luck!
All schematics/modules I post are free for all to use - but a credit is always polite!
Don't stagnate, mutate to create!
Don't stagnate, mutate to create!
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trogluddite - Posts: 1727
- Joined: Fri Oct 22, 2010 12:46 am
- Location: Yorkshire, UK
Re: Reading Loop points from WAV file - possible?
Thank you very much for the explanation and example - I'll definitely study it and see for how deep I can understand it
Cheers!
Cheers!
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Julian Ray - Posts: 23
- Joined: Tue Jun 18, 2019 2:58 pm
- Location: CANADA
Re: Reading Loop points from WAV file - possible?
There are also two projects from KGisback, one of it specifically a wave file reader, that was quite advanced. But you would need to use the search function (or Google's site search) to find it, because I forgot about the title.
"There lies the dog buried" (German saying translated literally)
- tulamide
- Posts: 2686
- Joined: Sat Jun 21, 2014 2:48 pm
- Location: Germany
Re: Reading Loop points from WAV file - possible?
its better if you search for "KG_is_back", thats the username
- adamszabo
- Posts: 657
- Joined: Sun Jul 11, 2010 7:21 am
Re: Reading Loop points from WAV file - possible?
Thanks guys, I'll search it right now
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Julian Ray - Posts: 23
- Joined: Tue Jun 18, 2019 2:58 pm
- Location: CANADA
Re: Reading Loop points from WAV file - possible?
Not sure if this would be of any use but while researching SDR, I came across this reference to parsing a wav in C.
http://truelogic.org/wordpress/2015/09/ ... file-in-c/
Maybe can glean some helpful hints, or convert code to assembler maybe, idk.
http://truelogic.org/wordpress/2015/09/ ... file-in-c/
Maybe can glean some helpful hints, or convert code to assembler maybe, idk.
- acg2010
- Posts: 80
- Joined: Tue Oct 05, 2010 3:18 am
Re: Reading Loop points from WAV file - possible?
I don’t know if this could help trog to modify his Ruby code, but I’ve attached a short WAV which does loop nicely, and a screenshot of the Wavosaur properties which show the loop start and end samples.
I imagine agc2010 wants only the loop sample values for a player.
Cheers
Spogg
I imagine agc2010 wants only the loop sample values for a player.
Cheers
Spogg
- Attachments
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- Looping WAV with loop points info.zip
- (369.72 KiB) Downloaded 782 times
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Spogg - Posts: 3318
- Joined: Thu Nov 20, 2014 4:24 pm
- Location: Birmingham, England
Re: Reading Loop points from WAV file - possible?
Thanks for the example file, Spogg, and for the code example, agc2010 (I would have included the research links from my old project - but they were all broken!)
Having had a bit more of a look at my old code, I think that extracting the other data "chunks" should be possible by adding their structures to the table at the beginning. I'll need to think a bit more about the parser though, as I don't think it will handle tables nested within tables properly yet; and if I remember the WAV format correctly, loop points require cross-referencing data from two different "chunks". Coincidentally, one of my current projects is a MIDI SysEx decoder which does exactly the same kind of memory-mapped data extraction - it's a similar enough problem that I may well end up with code that can be re-used here.
Having had a bit more of a look at my old code, I think that extracting the other data "chunks" should be possible by adding their structures to the table at the beginning. I'll need to think a bit more about the parser though, as I don't think it will handle tables nested within tables properly yet; and if I remember the WAV format correctly, loop points require cross-referencing data from two different "chunks". Coincidentally, one of my current projects is a MIDI SysEx decoder which does exactly the same kind of memory-mapped data extraction - it's a similar enough problem that I may well end up with code that can be re-used here.
All schematics/modules I post are free for all to use - but a credit is always polite!
Don't stagnate, mutate to create!
Don't stagnate, mutate to create!
-
trogluddite - Posts: 1727
- Joined: Fri Oct 22, 2010 12:46 am
- Location: Yorkshire, UK
Re: Reading Loop points from WAV file - possible?
Can we write Loop points TO a wav file?
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guyman - Posts: 199
- Joined: Fri Mar 02, 2018 8:27 pm
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