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Sound Blaster 16 Sound
Records and plays 16-bit sound on a Sound Blaster 16. Uses auto-initialized
DMA to reduce clicking. Sound data is stored in files containing raw 16-bit
signed samples suitable for processing or analysis. Full Turbo Pascal and
Borland C source code is included.
Release note: There is a bug that prevents SB16SN from working with
sound cards on IRQ10. To fix it in the Pascal version, edit the routine
IntHandler in sbio.pas and add the line "Port[$A0] := $20;" after the
line "Port[$20] := $20;" For the Borland C program, go to the routine
inthandler() and insert "outp(0xA0, 0x20);" on the line before the
statement "outp(0x20, 0x20);" Some copies of the Borland C version do
not have this problem. If yours does, edit the routine init_sb in
sbio.c. Look for the second occurance of "pic_maskport = 0x21;" and
replace it with "pic_maskport = 0xA1;"
Download SB16SND.ZIP (49,928 bytes)
Sound Blaster real-time signal processing
Performs simultaneous input and output on a Sound Blaster compatible
sound card. Includes a generic processing example and an example
program that mixes a sine wave with input.
Download SBPROCSS.ZIP (5,880 bytes)
Simultaneous recording and playback on the SB16
Does simultaneous recording and playback on the SB16. Uses 16-bit DMA
for recording and 8-bit DMA for playback. Supports sampling rates up
to 44khz and can be adapted for stereo. Sample program demonstrating
"echo" included. Borland C source included.
Version 1.01 fixes a problem with simultaneous interrupts. The original
version would incorrectly stop if interrupts from eight and sixteen bit
audio occur at the same time.
Note: There is a bug in v1.01 that will cause problems when DMA pages
are misaligned. To fix it, change the "+1" in line 283 and line 300
to "+bufferlength". Thanks to Alberto di Bene for pointing out this
Download SIMUL101.ZIP (17,172 bytes)
FMSOUND - FM Synthesized Audio
FMSOUND is a simple library, written in response to a question in
alt.sb.programmer, that allows you to make tones on the OPL2 FM
synthesizer. The OPL2 has nine audio channels, each capable of
producing two operator additive or FM synthesis, with full
attack/decay/sustain/release envelope, using one of four base waveforms
as a base. What this means to you is that you can make up to nine
independent sounds at a time, ranging in frequencies from below the
human range of hearing to far above it (although the sound card and
speakers may reduce this). Supports Borland C, Turbo Pascal, and
Download FMSOUND.ZIP (19,215 bytes)
SBDETECT - Detect Sound Blaster or compatible sound cards
This is some code I'm currently (97/6/29) working on to detect sound
cards, including base IO address, IRQ, and 8 and 16-bit DMA channels.
As of now, it only detects by playing with the hardware, but, when
it is completed, it will first use the BLASTER settings as a suggestion
(to be confirmed by testing hardware), then fall back to hardware
detection. I may also add support for reading the SB16 mixer registers
to obtain IRQ and DMA channels.
I've moved on to other projects, so I'm not planning to do any more
work on it. The code available here is probably the final version,
and there probably won't be any documentation.
UMSYS - Unfinished digital music engine
This is a project I worked on for a few months in 1995, then lost
interest in it and haven't touched it for several years. Rather
than let it sit unused on my computer, I'm releasing it to the
public. Hopefully someone will learn something from it. As far
as I know, it is the only library that does real-time wavetable
synthesis of MIDI files on non-wavetable cards.
Download UMSYS.ZIP (557,073 bytes)
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Ethan Brodsky <email@example.com>