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Fixed preferences page to only list output devices

CQTexperiment
Chris Moeller 2013-10-09 13:52:39 -07:00
parent d1e51ee9a1
commit a63e27f95c
1 changed files with 10 additions and 6 deletions
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16
Preferences/General/OutputsArrayController.m
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@ -35,14 +35,18 @@
theAddress.mSelector = kAudioDevicePropertyDeviceNameCFString; theAddress.mSelector = kAudioDevicePropertyDeviceNameCFString;
verify_noerr(AudioObjectGetPropertyData(devids[i], &theAddress, 0, NULL, &propsize, &name)); verify_noerr(AudioObjectGetPropertyData(devids[i], &theAddress, 0, NULL, &propsize, &name));
// Ignore devices that have no output channels: propsize = 0;
// This tells us the size of the buffer required to hold the information about the channels
theAddress.mSelector = kAudioDevicePropertyStreamConfiguration; theAddress.mSelector = kAudioDevicePropertyStreamConfiguration;
verify_noerr(AudioObjectGetPropertyDataSize(devids[i], &theAddress, 0, NULL, &propsize)); verify_noerr(AudioObjectGetPropertyDataSize(devids[i], &theAddress, 0, NULL, &propsize));
// Knowing the size of the required buffer, we can determine how many channels there are
// without actually allocating a buffer and requesting the information. if (propsize < sizeof(UInt32)) continue;
// (we don't care about the exact number of channels, only if there are more than zero or not)
if (propsize <= sizeof(UInt32)) continue; AudioBufferList * bufferList = (AudioBufferList *) malloc(propsize);
verify_noerr(AudioObjectGetPropertyData(devids[i], &theAddress, 0, NULL, &propsize, bufferList));
UInt32 bufferCount = bufferList->mNumberBuffers;
free(bufferList);
if (!bufferCount) continue;
NSDictionary *deviceInfo = [NSDictionary dictionaryWithObjectsAndKeys: NSDictionary *deviceInfo = [NSDictionary dictionaryWithObjectsAndKeys:
[NSString stringWithString:(NSString*)name], @"name", [NSString stringWithString:(NSString*)name], @"name",