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computers / comp.sys.apple2 / Re: IIgs sound from Applesoft

SubjectAuthor
* IIgs sound from ApplesoftMichael J. Mahon
`* IIgs sound from Applesoftduhas...@gmail.com
 `* IIgs sound from ApplesoftBrian Patrie
  `- IIgs sound from Applesoftduhas...@gmail.com

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Re: IIgs sound from Applesoft

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Subject: Re: IIgs sound from Applesoft
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 by: Michael J. Mahon - Wed, 18 Oct 2023 16:29 UTC

duhas...@gmail.com <duhast6377@gmail.com> wrote:
> On Saturday, October 14, 2023 at 10:54:12 AM UTC-4, fadden wrote:
>> On Friday, October 13, 2023 at 3:52:33 PM UTC-7, duhas...@g.com wrote:
>>> Is there a sanctioned way to play a digitized sound on the IIgs in
>>> Applesoft basic? I have a read a few ways of loading square waves of
>>> 256 bytes, but the sounds I want to play are substantially larger.
>> Purely from Applesoft could be tricky. Is your goal to be 100%
>> Applesoft, or just to do it without IIgs toolbox support?
>
> Purely from Applesoft I'm thinking. Bloading the sound file into memory
> and then setting up a transfer to the sound RAM. It seems possible, but
> just not explained clearly anywhere....

“Purely” is a non-starter, since PEEK and POKE can’t access sound
memory—there will *have* to be some machine code involved. So, the only
question is how much and how it’s loaded.

Where do you draw the line for *how* purely you feel you need it to be. ;-)

Are short sequences of machine code OK? How about a machine code library
of sound-related functions?

--
-michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com

Re: IIgs sound from Applesoft

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Subject: Re: IIgs sound from Applesoft
From: duhast6377@gmail.com (duhas...@gmail.com)
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 by: duhas...@gmail.com - Wed, 18 Oct 2023 22:43 UTC

On Wednesday, October 18, 2023 at 12:29:17 PM UTC-4, Michael J. Mahon wrote:

> > Purely from Applesoft I'm thinking. Bloading the sound file into memory
> > and then setting up a transfer to the sound RAM. It seems possible, but
> > just not explained clearly anywhere....
> “Purely” is a non-starter, since PEEK and POKE can’t access sound
> memory—there will *have* to be some machine code involved. So, the only
> question is how much and how it’s loaded.
>
> Where do you draw the line for *how* purely you feel you need it to be. ;-)
>
>
> Are short sequences of machine code OK? How about a machine code library
> of sound-related functions?
>
> --
> -michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com

Purely? Apparently this guy can play some sound without using anything but peeks and pokes.

https://lateblt.tripod.com/appl2snd.htm

Looking at this, and Ampersound, 256 byte sound waves are loaded. What if I want to load, say an 8192 byte long wave form? Just change the for next loop and as long as the wave is padded with zeros to whatever weird page boundaries are needed it will work? Every example is a generated sine wave, if I download a digitized .WAV file of Curly going Nyuk, Nyuk, Nyuk, and strip the first few bytes of info, will that work?

I'm still trying to get through Sonix, but semi-tones and some other stuff is hanging me up at the moment.

Re: IIgs sound from Applesoft

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From: bpatrie@bellsouth.spamisicky.net (Brian Patrie)
Newsgroups: comp.sys.apple2
Subject: Re: IIgs sound from Applesoft
Date: Thu, 19 Oct 2023 01:53:23 -0500
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 by: Brian Patrie - Thu, 19 Oct 2023 06:53 UTC

duhas...@gmail.com wrote:
> if I download a digitized .WAV file of Curly going Nyuk, Nyuk, Nyuk, and
> strip the first few bytes of info, will that work?

MS .wav files are RIFF (Resource Interchange File Format)--a structured
resource format similar in concept to a Macintosh or GS/OS resource fork
(but without being a forked file). They can contain all manner of
metadata. So getting the waveform data out of them is not as simple as
truncating a header off of them. You have to find at least the first
WAVE chunk (there can be more than one), and its associated geometry
metadata (sample width, sample rate, etc).

Re: IIgs sound from Applesoft

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Subject: Re: IIgs sound from Applesoft
From: duhast6377@gmail.com (duhas...@gmail.com)
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 by: duhas...@gmail.com - Fri, 20 Oct 2023 00:22 UTC

On Thursday, October 19, 2023 at 2:53:29 AM UTC-4, Brian Patrie wrote:
> duhas...@gmail.com wrote:
> > if I download a digitized .WAV file of Curly going Nyuk, Nyuk, Nyuk, and
> > strip the first few bytes of info, will that work?
> MS .wav files are RIFF (Resource Interchange File Format)--a structured
> resource format similar in concept to a Macintosh or GS/OS resource fork
> (but without being a forked file). They can contain all manner of
> metadata. So getting the waveform data out of them is not as simple as
> truncating a header off of them. You have to find at least the first
> WAVE chunk (there can be more than one), and its associated geometry
> metadata (sample width, sample rate, etc).

Has the format changed over the years? I remember 25 years ago in college downloading .WAV and loading them up in Audiozap or similiar and cutting a little off the front and it playing just fine. I didn't examine them on a byte level, but regardless, if not loading a .WAV, then a raw sound file over 256 bytes long....

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