phatcode.net / forum / view message

View Message

Peter Swinkels Wed Nov 3 2021 at 5:34 am
Recording and playing sound in Quick Basic

First the recording part:

Browsing through the sample code proviced on this website I found these snippets in "sndrec.asm":

mov dx,BASEADDR+00Ch

loopWait:
in al,dx
or al,al
js loopWait
ENDM

If I understand the code correctly, it is meant to ensure a consistent recording speed regardless of the CPU speed. Correct?

I also found this code at another website:

http://www.o-bizz.de/qbtuts/mallard/sbfaq.htm

I believe the examples provided there neglected to implement the speed control code posted above. Correct?

Now the play back part, this Quick Basic plays a single sample:

OUT CommAddr, &H10 'Give command to output a byte
OUT CommAddr, Byte(i) 'Output value

but there is no way to control the speed. How do I ensure samples are played back at a CPU independent speed?

Recording and playing sound in Quick Basic - Peter Swinkels (Wed Nov 3 2021 at 5:34 am)

I recommend using DMA - Plasma (Wed Nov 3 2021 at 12:57 pm)
- I made a DMA based wave player - Peter Swinkels (Sun Nov 7 2021 at 1:49 pm)
  - hmmm - Plasma (Mon Nov 8 2021 at 9:49 pm)
    - Both bugs should be fixed now. - Peter Swinkels (Tue Nov 9 2021 at 3:07 pm)
      - I was finally able to test this - Plasma (Fri Dec 31 2021 at 4:18 am)
        I finally thought to reply - Peter Swinkels (Tue Mar 1 2022 at 5:28 am)
    - I will look into that-> - Peter Swinkels (Tue Nov 9 2021 at 2:16 am)
- Question about DMA - Peter Swinkels (Sat Nov 6 2021 at 5:03 pm)
  - yes * - Plasma (Sat Nov 6 2021 at 5:34 pm)
- Thank you, - Peter Swinkels (Wed Nov 3 2021 at 1:12 pm)
  - Well - Plasma (Wed Nov 3 2021 at 1:41 pm)

Reply to this Message

Name
Subject

Message



No HTML is allowed, except for <code> <b> <i> <u> in the message only. All URLs and email addresses will automatically be converted to hyperlinks.

Forum

View Message

Reply to this Message