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- GUS Programmer's Digest Fri, 21 Oct 94 12:09 PST Volume 13: Issue 12
-
- Today's Topics:
- -*ANNOUNCEMENT*- gaia.ucs.orst.edu downtime Sat 10/22/94
- Continuous Recording
- GUS Programmer's Digest V13 #11
- MIDI engine source & UltraMID
-
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- Date: Thu, 20 Oct 1994 18:23:24 -0700 (PDT)
- From: Vince - IE - Experimental Mail Server Admin Acct <mailserv@ucs.orst.edu>
- Subject: -*ANNOUNCEMENT*- gaia.ucs.orst.edu downtime Sat 10/22/94
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- This is just to let everyone know that there will be a delay for
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- ---------- Text of forwarded message ----------
- Date: Wed, 19 Oct 1994 16:22:24 PDT
- From: Kean Stump <kean@cerridwen.ucs.orst.edu>
- Subject: gaia.ucs.orst.edu downtime Sat 10/22/94
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- We are changing out the boot disk on gaia Saturday morning, starting at 7:30.
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- ------------------------------
-
- Date: Fri, 21 Oct 94 11:16:24 EDT
- From: "c. james" <cjames@julian.uwo.ca>
- Subject: Continuous Recording
-
- >Date: 20 Oct 94 09:23:00 MET
- >From: "VISX80::GRECNER" <GRECNER%VISX80.decnet@musx53.zfe.siemens.de>
- >Subject: Continuous recording
-
-
- Roughly:
-
-
- {-------------------|-------------------} DMA BUFFER
-
- Fill whole buffer
- Program record counter (might be MAX only? for half buffer length)
- Put DMA in auto-init mode, go etc
- Handle Irq (occurs at half way) set flag1 to fill first half
- Fill first half on flag1
- Handle Irq (occurs now at end) set flag2 to fill second half
- Fill second half on apropriate flag2
-
- etc.
-
- To stop, need to re-program DMA to one-shot mode with apropriate count
- or just read the card's counter buffer and terminate when sufficient
- samples have been transferred.
-
- You can also do this without using interrupts by just polling counters,
- but thus means you're stuck for doing anything else at the same time.
-
- Okay, can someone tell me how to use the GF1 to get "seemless" playback.
- I followed all the SDK instructions - roll-over etc. The results were fine
- if the signals are fairly harmonically rich (i.e. speech) but I tried a
- sine wave and I get a click! I did that filler stuff with putting the
- previous word before the start of the voice's buffer and after the end
- (because of the linear interpolation) - still a click, but as I say not
- noticeable with music or speech. Saying that it must be possible since
- playfile did fine! There's a very slight gap when the GF1 loops
- back to the beginning (on a scope). I gave up and went with the Codec in
- the end, but it would be kinda cool to get it going with the DRAM and GF1
- (if you want a tone the buffer only needs to be one cycle long! Although
- I used 2048, 4096 etc points).
-
- Chris James
-
- ------------------------------
-
- Date: Fri, 21 Oct 1994 11:20:37 +0000 (GMT)
- From: kj@raunvis.hi.is (Kristjan Jonsson)
- Subject: Re: GUS Programmer's Digest V13 #11
-
- > Date: 20 Oct 94 09:23:00 MET
- > From: "VISX80::GRECNER" <GRECNER%VISX80.decnet@musx53.zfe.siemens.de>
- > Subject: Continuous recording
- >
- > >I see that the actual recording is taking place via DMA directly into the
- > >PC's memory (rather than the GUS RAM). Is it possible to set the recording
- > >to loop inside of a (for example) 20K block, sending an IRQ when a rollover
- > >point (10K, say) is reached? It makes sense that this would be possible, but
- > >I don't see from the SDK docs how to set it up.
- >
- > You have to implement your own double buffer. You start a transfer to one
- > buffer, after it's full, the DMA will signal an interrupt. Now you have
- > to programm DMA again to another buffer and go on. You have to be fast
- > to miss no sample. On a 20Mhz machine, you have cca. 450 cycles to do it
- > at 44.1kHz. This is the same technique Sound Blaster programmers have
- > to use for both recording and playback, and the same you'll have to use
- > when programming CODEC on the GUS MAX. Maybe there is some small DMA buffer
-
- Actually you can program the CODEC to interrupt after a specific number
- of bytes have been recorded (less than the size of the DMA buffer) and thus
- use the method first described to implement double buffering. It is documented
- in the latest SDK (v2.11) and doesn't work for plain GUS since it doesn't have
- the CODEC.
-
- --
- --- Kristjan Jonsson --- kj@raunvis.hi.is ---
-
- ------------------------------
-
- Date: Fri, 21 Oct 1994 14:32:58 BST
- From: Chris Barrett <se2cb@de-montfort.ac.uk>
- Subject: Re: MIDI engine source & UltraMID
-
- >> Hi GUS proggers.
- >>
- >> I am attempting to write some MIDI software (player, sequencer type stuff), and
- >> I have all the info I need on the MIDI format, and the .PAT file format.
- >>
- >> What I have not yet come across is any source code which handles the playing of
- >> patches (including all that enveloping and vibrato stuff).
- >>
- >> There's plenty of source for playing MODs, but does anybody out there have or
- >> knows of any freely available source to do such a thing?
- >>
- >> I'd luv to hear from ya...
- >
- >There's no freely available MIDI engine source, but have you considered
- >using Ultramid as your MIDI driver? It does all that you're asking for,
- >but it's a TSR-type driver for DOS. Ultramid programming docs can be
- >found on Epas.
- >
- >Phat.
-
- I forgot to mention that I AM currently using UltraMID! I suppose it will do
- for now, it does it's job pretty well, but you still have to load it it before
- using any programs that use it.
- I also want to be able to load patches into memory that may not neccessarily be
- listed in the .INI file (ie custom patch support).
- Can I get UltraMID to do this?
-
- Shame there's no MIDI engine source out there, hey Gravis, feeling generous?
- How about just putting that PlayMidi source in the SDK (nudge nudge, wink wink)!
-
- --
- Chris A. Barrett
- De Montfort University, Leicester, UK
- se2cb@dmu.ac.uk
- "Electronic mail - the best thing since electronic bread."
-
- ------------------------------
-
- End of GUS Programmer's Digest V13 #12
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