[PD] Sample loop - start and end point (WAV files)

[Ingo]

Dan, do you mean a simple soundfile that has loop markers embedded? I have tons of them.

Do you need .wav or .aiff or both? Mine are usually .wav but I can convert it to .aiff as well.

 

I'll have to check on my old computer first to make sure whether the files header contain the loops.

 

Ingo

 

 

From: Dan Wilcox [mailto:danomatika at gmail.com] 
Sent: Friday, February 21, 2020 1:47 PM
To: Ingo
Cc: José de Abreu; Giulio Moro; k.s.matheussen at notam02.no; Pd-List
Subject: Re: [PD] Sample loop - start and end point (WAV files)

 

Can someone send me example files with encoding loop positions? I started with demo soundfile meta data reading/writing but now I need some sample files to work with. I saved a couple via Logic Pro X but the region info is saved as simple markers, not using instrument or sampler chunks.





On Feb 12, 2020, at 3:48 PM, Ingo <ingo at miamiwave.com <mailto:ingo at miamiwave.com> > wrote:

 

How would loopautitioneer automatically reed the loop points from within Pd and transfer them?

I can reed the loop points externally with no problem. My problem is to set the loop points automatically from within Pd.

 

Ingo

 

From: José de Abreu [mailto:abreubacelar at gmail.com] 
Sent: Wednesday, February 12, 2020 3:08 PM
To: Giulio Moro
Cc: k.s.matheussen at notam02.no <mailto:k.s.matheussen at notam02.no> ; Ingo; Dan Wilcox; Pd-List
Subject: Re: [PD] Sample loop - start and end point (WAV files)

 

hello all, i don't know if it is relevant, but my simple google search returned this software too:

 

 <http://loopauditioneer.sourceforge.net/> http://loopauditioneer.sourceforge.net/

 

LoopAuditioneer is a software for evaluating, creating and manipulating loops and cues existing in wav file metadata. It's envisionaged to be useful for sample production for virtual pipe organs, like for instance  <http://sourceforge.net/projects/ourorgan/> GrandOrgue software.


SOURCE CODE:
------------

Is available on  <http://sourceforge.net/projects/loopauditioneer/> http://sourceforge.net/projects/loopauditioneer/ by SVN.

 

Em qua., 12 de fev. de 2020 às 08:15, Giulio Moro via Pd-list < <mailto:pd-list at lists.iem.at> pd-list at lists.iem.at> escreveu:

libsndfile also can extract loop points from a variety of formats. The relevant code for wav is here  <https://github.com/erikd/libsndfile/blob/master/src/wav.c#L1140-L1163> https://github.com/erikd/libsndfile/blob/master/src/wav.c#L1140-L1163

Kjetil Matheussen wrote:
> On Wed, Feb 12, 2020 at 10:56 AM Kjetil Matheussen
> < <mailto:k.s.matheussen at gmail.com> k.s.matheussen at gmail.com> wrote:
>>
>> On Wed, Feb 12, 2020 at 10:14 AM Ingo < <mailto:ingo at miamiwave.com> ingo at miamiwave.com> wrote:
>>>
>>> Thanks, Dan!
>>>
>>>
>>>
>>> They must be embedded in the "Marker Chunk" in AIFF and in the "Cue Point Chunk" in the WAV format.
>>>
>>> This gives me a further idea for searching on.
>>>
>>>
>>
>> Yes, loops are usually defined as "Loop Start" and "Loop End" cues,
> 
> Hmm, or maybe they are usually defined in the "smpl" chunk, I don't remember...
> 
> But here's the code to get loop data from a wav file in radium:
>  <https://github.com/kmatheussen/radium/blob/master/audio/Sampler_plugin_wav_parse.c#L253> https://github.com/kmatheussen/radium/blob/master/audio/Sampler_plugin_wav_parse.c#L253
> 
> First it checks if there is a loop in the "smpl" chunk. If there isn't
> loop data there, it checks for "Loop Start" and "Loop End" cues.
> 
> 
> 
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--------

Dan Wilcox

@danomatika <http://twitter.com/danomatika> 

danomatika.com <http://danomatika.com> 

robotcowboy.com <http://robotcowboy.com> 

 

 

 

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