[chuck-users] LiSa SndBuf rate bug?

mike clemow gelfmuse at gmail.com
Sat Nov 15 12:52:42 EST 2008


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
>>>>> _______________________________________________
>>>>> chuck-users mailing list
>>>>> chuck-users at lists.cs.princeton.edu
>>>>> https://lists.cs.princeton.edu/mailman/listinfo/chuck-users
>>>>
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>>>
>>>
>>>
>>> --
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>>> http://semiotech.org
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