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From: "Rod Pemberton" <do_not_have AT bitfoad DOT cmm>
Newsgroups: comp.os.msdos.djgpp
References: <1179198543 DOT 710532 DOT 156270 AT w5g2000hsg DOT googlegroups DOT com>   <4649645d$0$20296$9b4e6d93 AT newsspool3 DOT arcor-online DOT net> <1179233938 DOT 968657 DOT 125170 AT q75g2000hsh DOT googlegroups DOT com>
Subject: Re: DMA and Soundblaster with DJGPP
Date: Tue, 15 May 2007 23:29:09 -0400
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Organization: Cuneo2Lemon Project
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com


<pyzals AT gmail DOT com> wrote in message
news:1179233938 DOT 968657 DOT 125170 AT q75g2000hsh DOT googlegroups DOT com...
> Slash'EM to start out with. Nothing official, just for fun.
>
> What DJ said makes perfect sense to me now, (Thanks DJ). What I still
> don't understand is that there seems to be code out there that is
> supposed to work with DJGPP, but doesn't take this into account.
>
> http://www.shdon.com/dos/sound#mixing
> is an excellent example. I downloaded it and compiled it. It compiles
> perfectly, but it's wav file reproduction is faulty. The wav's start
> playing somewhere in the middle and are generally messed up.
>

dmamix-d.zip for DJGPP?  I downloaded that.  When I first ran it, it
crackled like crazy.  But, I figured I was using the wrong IRQ and DMA.  My
sound blaster string is this:

SET BLASTER=A220 I5 D1

When I tried IRQ 5 and DMA 1, all the .wav's ran nicely in a Windows
console.  When I tried under DOS, it couldn't find my sound card.

I compiled with gcc -Wall -pedantic which found a few errors.  Delete the
start and end lines and run through patch:

patch -p0 < dmagcc.dif


Rod Pemberton

----START--dmagcc.dif---
--- dmagcc.c 1999-02-16 01:12:42.000000000 +0000
+++ dmagcc.new 2007-05-15 23:11:20.000000000 +0000
@@ -56,7 +56,7 @@
   outportb (Test + 0x6, 0);
   delay(10);
   //Check if (reset was succesfull
-  if ((inportb(Test + 0xE) & 0x80 == 0x80) && (inportb(Test + 0xA) ==
0xAA))
+  if (((inportb(Test + 0xE) & 0x80) == 0x80) && (inportb(Test + 0xA) ==
0xAA))
   {
     //DSP was found
     Base = Test;
@@ -134,7 +134,7 @@
 {
   char *Address;
   //Fill an 8K block in the DMA buffer with 128's - silence
-  Address = DMABuffer + (Buffer << 13);
+  Address = (char *)(DMABuffer + (Buffer << 13));
   memset (Address, 128, 8192);
   //Copy DMA buffer to DOS memory
   dosmemput(Address, 8192, DOSBufOfs + (Buffer << 13));
@@ -197,7 +197,7 @@
   Voice->SoundLength = ftell (WAVFile) - 48;
   fseek(WAVFile, 0L, SEEK_SET);

-  Voice->Sample = (char *)malloc(Voice->SoundLength + 2); //Assign memory
+  Voice->Sample = (unsigned char *)malloc(Voice->SoundLength + 2); //Assign
memory
   fseek(WAVFile, 46L, SEEK_SET);                      //Skip the header

   //Load the sample data
@@ -250,7 +250,7 @@
   unsigned int  Page1, Page2; //Words

   //Assign 32K to DMA Buffer
-  DMABuffer = (char *)malloc (32768);
+  DMABuffer = (unsigned char *)malloc (32768);

   //Assign 32K (2048 paragraphs) of DOS memory
   TempBuf.size = 2048;
@@ -298,7 +298,7 @@
   _go32_dpmi_set_protected_mode_interrupt_vector (Vector, &OldIRQ);
 }

-void main ()
+int main (void)
 {
   int Temp;
   //Clear screen
@@ -317,11 +317,11 @@
   if (Temp == 9) {
     //or none at all
     printf ("No Sound Blaster found\n");
-    return;
+    return(0);
   } else printf ("Sound Blaster found at %Xh\n", Base);

-  printf ("Please specify DMA channel : "); scanf("%d", &DMA);
-  printf ("Please specify IRQ level   : "); scanf("%d", &IRQ);
+  printf ("Please specify DMA channel : "); scanf("%u", &DMA);
+  printf ("Please specify IRQ level   : "); scanf("%u", &IRQ);

   //Assign memory to the DMA Buffer
   AssignBuffer ();
@@ -390,5 +390,5 @@
     outportb (0x21, inportb (0x21) | 4);
   } else outportb (0x21, inportb (0x21) | (1 << IRQ));

-  return;
+  return(0);
 }

----END---