Alex <lee188 <at> singnet.com.sg> writes: > > Hi Daniel et al, > > I have successfully interfaced the sdr-widget with Linux alsa-driver > for ASYNC > OUT with rate feedback. Found out after much trial > and error and reading of the > usbaudio alsa-driver source code that you are > using 12.13 as the format for the > feedback rate !!! I was trying with 10.14 (UAC1 v1.2 specs > , I think) in 3 bytes, > and 16.16 (USB 2.0) in 4 bytes for quite a number of days > with no success !!! > > However, 12.13 in 4 bytes, whilst working like a charm > with Linux, does NOT work > with OSX. > > Would you know the format used by OSX? > > Thanks. > > Alex > Hi Daniel et al, This is an excerpt from: http://www.opensource.apple.com/source/AppleUSBAudio/AppleUSBAudio- 273.4.1/AppleUSBAudioStream.cpp ============================================================== associatedEndpoint.type = kUSBIsoc; associatedEndpoint.direction = kUSBIn; // The associated endpoint always goes "in" // The sample rate should be either a 3-byte 10.14 or a 4-byte 16.16 associatedEndpoint.maxPacketSize = mFeedbackPacketSize; associatedEndpoint.interval = 0xFF; mAssociatedPipe = mStreamInterface->FindNextPipe (NULL, &associatedEndpoint); FailWithAction (NULL == mAssociatedPipe, result = kIOReturnError, Exit); =============================================================== Alex _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
