Unable to change WDM-KS sample rate

[jmag9999]

When using FlexASIO within REW, the sample selection goes blank when selecing WMD-KS. All other modes appear to work. When using WMD-KS, the audio input/output continues to work, but the sample rate remains on the last used rate and is no longer selectable. I have attached my log after REW startup as well as the PortAudioDevices output.

More Info
https://www.avnirvana.com/threads/flexasio-and-wmd-ks-sample-rate-selection-disappears.11015/[](url)

FlexASIO.log
PortAudioDevices.txt

[dechamps]

The log suggests WDM-KS is not working at all:

--- ENTERING CONTEXT: canSampleRate()
Checking for sample rate: 44100
Checking if input supports this sample rate
CFlexASIO::OpenStream(inputEnabled = 1, outputEnabled = 0, sampleRate = 44100, framesPerBuffer = 0, callback = 00007FFD9A4E4CF0, callbackUserData = 0000000000000000)
Opening PortAudio stream with...
...input parameters: PortAudio stream parameters for device index 18, 2 channels, sample format 2147483649 [Float32, NonInterleaved], suggested latency 0s
...output parameters: none
...sample rate: 44100 Hz
...frames per buffer: 0
...stream flags: 8 [PrimeOutputBuffersUsingStreamCallback]
...stream callback: 00007FFD9A4E4CF0 (user data 0000000000000000)
[PortAudio] OpenStream:sampleRate = 44100.000000
[PortAudio] OpenStream:framesPerBuffer = 0
[PortAudio] Pin create result = 0x00000000
[PortAudio] Capture pin frames: 0
[PortAudio] Input frames chosen:0
[PortAudio] Failed to get buffer with notification
[PortAudio] Failed to get buffer without notification
[PortAudio] Buffer size on 128 byte boundary, still fails :(
[PortAudio] Failed to get input buffer (WaveRT)
Input does not support this sample rate: unable to open PortAudio stream: Unanticipated host error
Checking if output supports this sample rate
CFlexASIO::OpenStream(inputEnabled = 0, outputEnabled = 1, sampleRate = 44100, framesPerBuffer = 0, callback = 00007FFD9A4E4CF0, callbackUserData = 0000000000000000)
Opening PortAudio stream with...
...input parameters: none
...output parameters: PortAudio stream parameters for device index 24, 2 channels, sample format 2147483649 [Float32, NonInterleaved], suggested latency 0s
...sample rate: 44100 Hz
...frames per buffer: 0
...stream flags: 8 [PrimeOutputBuffersUsingStreamCallback]
...stream callback: 00007FFD9A4E4CF0 (user data 0000000000000000)
[PortAudio] OpenStream:sampleRate = 44100.000000
[PortAudio] OpenStream:framesPerBuffer = 0
[PortAudio] Pin create result = 0x00000000
[PortAudio] Render pin frames: 0
[PortAudio] Output frames chosen:0
[PortAudio] Failed to get buffer with notification
[PortAudio] Failed to get buffer without notification
[PortAudio] Buffer size on 128 byte boundary, still fails :(
[PortAudio] Failed to get output buffer (with notification)
Output does not support this sample rate: unable to open PortAudio stream: Unanticipated host error
Sample rate 44100 is unavailable
--- EXITING CONTEXT: canSampleRate() [OK]

It looks like the input and output devices you are using, Line (E1DA Cosmos ADC PCM32/384) and Speakers (E50), are also the default Windows audio devices:

Found backend: PortAudio host API index 2 (name: 'Windows WASAPI', type: 13 [WASAPI], default input device: 15, default output device: 12)
Found device: PortAudio device index 12 (name: 'Speakers (E50)'
Found device: PortAudio device index 15 (name: 'Line (E1DA Cosmos ADC PCM32/384)'
Found device: PortAudio device index 18 (name: 'Line (E1DA Cosmos ADC PCM32/384)'
Found device: PortAudio device index 24 (name: 'Speakers (E50)'

As explained in the FAQ, WDM-KS is unlikely to work when pointed to the default Windows audio devices, as that usually means the devices are already in use. WDM-KS usually cannot open devices that are in use.

Does it work if you change your default audio devices to something else in your Windows audio settings?

When using WMD-KS, the audio input/output continues to work, but the sample rate remains on the last used rate and is no longer selectable.

As far as I can tell WDM-KS is not working at all, period. Most likely it's REW misleading you - the backend did not actually change and you are still using the previous backend you were using, not WDM-KS.

[jmag9999]

In the log above, I did not start the generator or the input recording. I just opened REW and configured the devices. I will try changing the default audio devices. I am pretty confident that REW is using WDM-KS, as the SINAD measurements do change when only changing the backend. I can do another log with generator and input working if that helps.

[dechamps]

I can do another log with generator and input working if that helps.

A log of WDM-KS actually working would be interesting to see, yes.

[jmag9999]

OK, here is a new log with both input and output working. Changing the default devices did not seem to help.

FlexASIO.log

[dechamps]

You are correct - it is indeed successfully running WDM-KS:

--- ENTERING CONTEXT: createBuffers()
Request to create buffers for 2 channels, size 4096 samples
Allocated 2 buffer sets, 1/1 (I/O) channels per buffer set, 4096 samples per channel, 4/4 (I/O) bytes per sample, memory range: 0000000019A4AFE0-0000000019A5AFE0
ASIO buffer #0 is input channel 0 - first half: 0000000019A4AFE0-0000000019A4EFE0 - second half: 0000000019A52FE0-0000000019A56FE0
ASIO buffer #1 is output channel 0 - first half: 0000000019A4EFE0-0000000019A52FE0 - second half: 0000000019A56FE0-0000000019A5AFE0
CFlexASIO::OpenStream(inputEnabled = 1, outputEnabled = 1, sampleRate = 192000, framesPerBuffer = 4096, callback = 00007FFDA3B33A71, callbackUserData = 000000001BB539F0)
Opening PortAudio stream with...
...input parameters: PortAudio stream parameters for device index 18, 2 channels, sample format 2147483649 [Float32, NonInterleaved], suggested latency 0.064s
...output parameters: PortAudio stream parameters for device index 24, 2 channels, sample format 2147483649 [Float32, NonInterleaved], suggested latency 0.064s
...sample rate: 192000 Hz
...frames per buffer: 4096
...stream flags: 8 [PrimeOutputBuffersUsingStreamCallback]
...stream callback: 00007FFDA3B33A71 (user data 000000001BB539F0)
[PortAudio] OpenStream:sampleRate = 192000.000000
[PortAudio] OpenStream:framesPerBuffer = 4096
[PortAudio] Pin create result = 0x00000000
[PortAudio] Capture pin frames: 0
[PortAudio] Pin create result = 0x00000000
[PortAudio] Render pin frames: 0
[PortAudio] Input frames chosen:12288
[PortAudio] Output frames chosen:12288
[PortAudio] PinGetBuffer: SubType_kNotification
[PortAudio] Input buffer start = 000000001BDE0000, size = 196608
[PortAudio] PinGetBuffer: SubType_kNotification
[PortAudio] Output buffer start = 000000001BE10000, size = 196608, membarrier = 0
[PortAudio] BytesPerInputFrame = 8
[PortAudio] BytesPerOutputFrame = 8
[PortAudio] Failed to register position register
[PortAudio] Failed to register capture position register, using PinGetAudioPositionViaIOCTLWrite
[PortAudio] Failed to register position register
[PortAudio] Failed to register rendering position register, using PinGetAudioPositionViaIOCTLRead
PortAudio stream opened: 000000001BB742F0

It's surprising that WDM-KS works when streaming but not when probing for sample rates. I will have to take a closer look when I have some time.

[dechamps]

@GoldenSound reported the same problem in #178. It seems to affect devices using WaveRT-based drivers regardless of the ASIO Host Application (I was able to reproduce in FlexASIOTest). The underlying cause appears to be the PortAudio WDM-KS backend being unable to open streams with paFramesPerBufferUnspecified.

[dechamps]

After some more experiments it looks like I was slightly off on the trigger - it's not paFramesPerBufferUnspecified that causes this, it's PaStreamParameters::suggestedLatency being set to zero. Anyway, I reported the bug to downstream in PortAudio/portaudio#761.