audio: Avoid recalculation of descriptor parameters

XboxDev · Jun 9, 2020 · 57defbf · 57defbf
1 parent 702f3a1
commit 57defbf
Showing 1 changed file with 6 additions and 5 deletions.
diff --git a/lib/hal/audio.c b/lib/hal/audio.c
@@ -245,16 +245,17 @@ void XAudioProvideSamples(unsigned char *buffer, unsigned short bufferLength, in
 	if (isFinal) 
 		bufferControl |= 0x4000;
 
-	unsigned int address = (unsigned int)buffer;
+	unsigned int address = MmGetPhysicalAddress((PVOID)buffer);
+	unsigned int wordCount = bufferLength / 2;
 
-	pac97device->pcmOutDescriptor[pac97device->nextDescriptorMod31].bufferStartAddress    = MmGetPhysicalAddress((PVOID)address);
-	pac97device->pcmOutDescriptor[pac97device->nextDescriptorMod31].bufferLengthInSamples = bufferLength / (pac97device->sampleSizeInBits / 8);
+	pac97device->pcmOutDescriptor[pac97device->nextDescriptorMod31].bufferStartAddress    = address;
+	pac97device->pcmOutDescriptor[pac97device->nextDescriptorMod31].bufferLengthInSamples = wordCount;
 	pac97device->pcmOutDescriptor[pac97device->nextDescriptorMod31].bufferControl         = bufferControl;
 	pb[0x115] = (unsigned char)pac97device->nextDescriptorMod31; // set last active descriptor
 	analogBufferCount++;
 
-	pac97device->pcmSpdifDescriptor[pac97device->nextDescriptorMod31].bufferStartAddress    = MmGetPhysicalAddress((PVOID)address);
-	pac97device->pcmSpdifDescriptor[pac97device->nextDescriptorMod31].bufferLengthInSamples = bufferLength / (pac97device->sampleSizeInBits / 8);
+	pac97device->pcmSpdifDescriptor[pac97device->nextDescriptorMod31].bufferStartAddress    = address;
+	pac97device->pcmSpdifDescriptor[pac97device->nextDescriptorMod31].bufferLengthInSamples = wordCount;
 	pac97device->pcmSpdifDescriptor[pac97device->nextDescriptorMod31].bufferControl         = bufferControl;
 	pb[0x175] = (unsigned char)pac97device->nextDescriptorMod31; // set last active descriptor
 	digitalBufferCount++;