Re: Setting the sample rate in a WAV file

Ah... yes, that's right. You'll need to pull the contents of the Buffer
into an Array. For use w/ SignalBox's write message, the Array will have to
be converted to a Signal first.


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On Thu, May 6, 2021 at 6:15 PM <[email protected]> wrote:

> On Fri, May 7, 2021 at 3:23 AM <[email protected]> wrote:
> > I have a process that creates signals at rates other than the server’s
> sample rate, and I want to save these signals using a custom UGen
> GatedDiskOut that writes a frame only on a trigger (very useful). But then
> I need to get the effective sample rate into the WAV file header, and I
> can’t figure out how. I have tried buffer.sampleRate, but buffer.write and
> buffer.close both seem to ignore that, writing the server’s samplerate to
> the WAV header instead.
>
> That's right. `buffer.write` uses the server command /b_write to
> create the file. This can use the server's sample rate only. There's
> no way to override that.
>
> > sf.sampleRate and sf.asBuffer
>
> Converting a SoundFile to a buffer would imply reading from a file,
> wouldn't it? I can't see how that would help you with writing.
>
> In any case... if you get the data into the language client
> (`loadToFloatArray` or `getToFloatArray`), then you can use SoundFile
> to write it with any header information you specify.
>
> If b is your buffer:
>
> (
> var path = "..... where to save it...";
> var yourDesiredSampleRate = 1000;  // or whatever
>
> b.loadToFloatArray(action: { |data|
>     var file = SoundFile(path);
>
>     file.sampleRate_(yourDesiredSampleRate)
>     .numChannels_(b.numChannels)
>     .sampleFormat_("int24")  // or int16 or float
>     .headerFormat_("WAV");
>
>     protect {
>         if(file.openWrite) {
>             file.writeData(data);
>         } {
>             "% could not be opened for writing".format(path.basename).warn;
>         };
>     } { file.close };
> });
> )
>
> The Signal:write method from the SignalBox quark just packages the
> writing part of the above example into a single method call. But it
> won't get the data from the server for you (as far as I can see).
>
> hjh
>
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