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--- drivers/common/unixdsp.c 2003-06-20 12:37:26.000000000 -0500
+++ drivers/common/unixdsp.c 2003-07-06 21:58:21.000000000 -0500
@@ -36,6 +36,7 @@
static int format;
static int dspfd;
+static int fakestereo;
// fsize is in samples, not bytes(gets translated before ioctl())
int InitUNIXDSPSound(int *rate, int bits, int fsize, int nfrags, int dev)
@@ -89,9 +90,19 @@
if(ioctl(dspfd,SNDCTL_DSP_SETFRAGMENT,&x)==-1)
printf("ERROR (continuing anyway)\n");
- x=0;
+
+ // Set mono sound.
+ // Some sound cards can only do stereo, so simulate stereo for these cards.
+ x=1;
+ fakestereo=0;
printf("\n Setting mono sound...");
- if(ioctl(dspfd,SNDCTL_DSP_STEREO,&x)==-1) goto __disperror;
+ if(ioctl(dspfd,SNDCTL_DSP_CHANNELS,&x)==-1) goto __disperror;
+ if(x == 2)
+ {
+ printf("\n Couldn't set mono, faking stereo...\n");
+ fakestereo = 1;
+ }
+
printf("\n Setting playback rate of %d hz...",*rate);
if(ioctl(dspfd,SNDCTL_DSP_SPEED,rate)==-1) goto __disperror;
printf("Set to %d hz\n",*rate);
@@ -107,9 +119,10 @@
}
static int16 MBuffer[2048];
+static int16 fakebuffer[4098];
void WriteUNIXDSPSound(int32 *Buffer, int Count, int noblocking)
{
- int P,c;
+ int P,c,i;
int32 *src=Buffer;
if(format)
@@ -127,13 +140,35 @@
c=Count<<1;
}
-// noblocking=!noblocking; // speed testing
- if(noblocking)
+ // If a device can only support stereo, fake stereo by duplicating each item in the buffer.
+ if(fakestereo)
+ {
+ for (i=0; i <= c; i++ )
+ {
+ fakebuffer[2*i] = MBuffer[i];
+ fakebuffer[2*i+1] = MBuffer[i];
+ }
+ c = c * 2;
+ // noblocking=!noblocking; // speed testing
+ if(noblocking)
+ {
+ struct audio_buf_info ai;
+ if(!ioctl(dspfd,SNDCTL_DSP_GETOSPACE,&ai))
+ if(ai.bytes<c)
+ return;
+ }
+ write(dspfd,(uint8 *)fakebuffer,c);
+ }
+ else
{
- struct audio_buf_info ai;
- if(!ioctl(dspfd,SNDCTL_DSP_GETOSPACE,&ai))
- if(ai.bytes<c)
- return;
+ // noblocking=!noblocking; // speed testing
+ if(noblocking)
+ {
+ struct audio_buf_info ai;
+ if(!ioctl(dspfd,SNDCTL_DSP_GETOSPACE,&ai))
+ if(ai.bytes<c)
+ return;
+ }
+ write(dspfd,(uint8 *)MBuffer,c);
}
- write(dspfd,(uint8 *)MBuffer,c);
}
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