[chuck-users] LiSa SndBuf rate bug?

[mike clemow]

Yup!  That was definitely the problem with the speed.  Okay, cool, I'm
not crazy.  ;-)

I still only get the first half of the SndBuf in the LiSa object,
however.  I'm trying to tease out why.

-Mike

On Sat, Nov 15, 2008 at 1:31 PM, Daniel Trueman <dtrueman at princeton.edu> wrote:
> so, something like this should work for stereo and greater files:
> //ugens
> SndBuf buf;
> LiSa lisa => dac;
> //change this path to your own sample
> "/Applications/Max5/examples/sounds/cello-f2.aif" => buf.read;
> //set lisa buffer size to sample size
> ( buf.samples() / buf.channels() )::samp => lisa.duration;
> //transfer values from SndBuf to LiSa
> for ( 0 => int i; i < buf.samples() / buf.channels(); i++ ) {
>
>
>
>     (buf.valueAt(i * buf.channels()), i::samp) => lisa.valueAt;
>
>
>
> }
> //party on...
> 1  => lisa.play;
> 2. => lisa.rate;
> //hang on until it's done...
> lisa.duration() * 0.5  => now;
> i've posted this on the LiSa examples wiki.
> dt
>
> On Nov 15, 2008, at 1:02 PM, mike clemow wrote:
>
> I just downloaded the newest miniAudicle (0.1.3.9) and experience the
> same behavior as before at 44100hz sampling rate.
> -Mike
> On Sat, Nov 15, 2008 at 12:52 PM, mike clemow <gelfmuse at gmail.com> wrote:
>
> I'm on Mac OS X 10.4.11 running at 44100.  However, it doesn't change
> if I change the sampling rate.  I'm using Chuck 1.2.1.2 on the command
> line.
> hrm...
> -Mike
> On Sat, Nov 15, 2008 at 12:41 PM, Daniel Trueman <dtrueman at princeton.edu>
> wrote:
>
> what platform are you on, and what sampling rate are you running at?
> dt
> On Nov 15, 2008, at 12:30 PM, Daniel Trueman wrote:
>
> hmmm... not sure what's going on. the example works as expected for me,
> and as you describe how it should work (plays the whole file through at
> twice speed), using the most recent release of miniaudicle and chuck. and
> the last line should be lisa.duration() * 0.5 => now, though that shouldn't
> affect what you hear.
> dt
> On Nov 15, 2008, at 12:16 PM, mike clemow wrote:
>
> Hi Dan,
> I guess what I'm trying to say is that, when I run this example, I
> only get the first half of the SndBuf into LiSa and it plays back at
> half-speed when the rate is set to 1.  It seems to me, that this isn't
> right.  Since, the example came with the rate set to 2 in order to
> play back at normal speed, I assumed that you guys knew about this.
> buf.samples() * 1::samp => lisa.duration;
> This should (however you choose to write it) create a buffer equal in
> size to the SndBuf.
> for ( 0 => int i; i < buf.samples(); i++ ) {
>        //args are sample value and sample index (dur must be integral in
> samples)
>        lisa.valueAt(buf.valueAt(i), i::samp);
> }
> Here, I understand we're copying all the samples from SndBuf into LiSa.
> 1  => lisa.play;
> 2. => lisa.rate;
> Playing back with a rate of 2 should make it play back twice as fast
> as normal, if I understand this correctly, however, it doesn't seem to
> do so.
> lisa.duration() => now;
> This should advance time long enough to hear the whole thing.  This is
> true, but only because we have only the first half of the SndBuf in
> LiSa, and we hear it twice.  This doesn't seem right to me, unless I'm
> missing something.
> -Mike
>
>
> On Fri, Nov 14, 2008 at 9:24 PM, dan trueman <dtrueman at princeton.edu>
> wrote:
>
> 'tis an example. change the line:
> 2. => lisa.rate;
> to whatever you want to get a different rate. just make sure you change:
> lisa.duration() * 0.5 => now;
> to an appropriate value as well, to make sure it plays long enough....
> dt
> On Nov 14, 2008, at 8:10 PM, mike clemow wrote:
>
> Hey folks,
> In the below example (which you will all find in the LiSa-SndBuf.ck
> file in examples in your installation), after populating the buffer in
> the LiSa object with the values of the samples from SndBuf, the rate
> of the LiSa object is set equal to 2. in order to play back normally.
> Why is it not 1?  Why this should be the case makes little sense to me
> and I respectfully submit this as a bug, unless someone can provide a
> reasonable explanation.
> Thoughts?
> -Mike
>
> -----
> //ugens
> SndBuf buf;
> LiSa lisa => dac;
> //change this path to your own sample
> "/Users/dan/Files/Chuck/LiSa_examples/TomVega.wav" => buf.read;
> //set lisa buffer size to sample size
> buf.samples() * 1::samp => lisa.duration;
> //transfer values from SndBuf to LiSa
> for ( 0 => int i; i < buf.samples(); i++ ) {
>       //args are sample value and sample index (dur must be integral in
> samples)
>       lisa.valueAt(buf.valueAt(i), i::samp);
> }
> //party on...
> 1  => lisa.play;
> 2. => lisa.rate;
> //look at some of the data
> //returns value at given time, with linear interpolation
> <<< Std.rand2f( 0., lisa.duration() / 1::samp ) :: samp  =>
> lisa.valueAt
>
> ;
>
> //hang on until it's done...
> lisa.duration() * 0.5 => now;
> --
> http://michaelclemow.com
> http://semiotech.org
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