Re: HALOutputUnit (Pt 2)
Re: HALOutputUnit (Pt 2)
- Subject: Re: HALOutputUnit (Pt 2)
- From: Bob Stuller <email@hidden>
- Date: Mon, 23 Feb 2004 15:49:14 -0500
Doug, Greetings!
At 11:55 AM -0800 2/23/04, Doug Wyatt wrote:
On Feb 23, 2004, at 11:02, Bob Stuller wrote:
But when I call this:
status = AudioUnitSetProperty(mHALOutInstance,
kAudioDevicePropertyStreamFormat,
kAudioUnitScope_Output,
kDeviceInputElement,
&mInputDesc.description,
sizeof(AudioStreamBasicDescription));
This returns 'kAudioDeviceUnsupportedFormatError'.
What exactly is the stream format you are setting?
I ask for the best match to this format:
inputDesc.description.mSampleRate = foundRate; // 16000.0 if the
device supports it.
inputDesc.description.mFormatID = kAudioFormatLinearPCM;
inputDesc.description.mFormatFlags = kLinearPCMFormatFlagIsBigEndian
| kLinearPCMFormatFlagIsSignedInteger
| kLinearPCMFormatFlagIsPacked
| kLinearPCMFormatFlagIsNonInterleaved;
inputDesc.description.mChannelsPerFrame = 1;
inputDesc.description.mBitsPerChannel = 16;
propertySize = sizeof(AudioStreamBasicDescription);
status = AudioDeviceGetProperty(deviceIDs[i], 0, true,
kAudioDevicePropertyStreamFormatMatch,
&propertySize, &inputDesc.description);
I get, typically:
inputDesc.description.mSampleRate == 16000.0
inputDesc.description.mFormatID == kAudioFormatLinearPCM
inputDesc.description.mFormatFlags == kLinearPCMFormatFlagIsBigEndian
| kAudioFormatFlagIsFloat
| kLinearPCMFormatFlagIsPacked
inputDesc.description.mChannelsPerFrame == 2
inputDesc.description.mBitsPerChannel == 32
which is what I pass in.
Peace,
Bob
--
It's Great to be Green!
http://www.greenpartyus.org/
_______________________________________________
coreaudio-api mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/coreaudio-api
Do not post admin requests to the list. They will be ignored.