Audio QIODevice readyRead signal not firing at correct interval with 48000Hz

Trying to capture audio with a USB headset. The audio format we're using is as follows.

QAudioFormat(48000Hz, 16bit, channelCount=2, sampleType=SignedInt, byteOrder=LittleEndian, codec="audio/pcm")

If I set the input buffer size to 1024 (and verify that it is set as such by getting bufferSize() after start() has been called - the readyRead() signal for the associated QIODevice doesn't actually fire until the QAudioInput instance reports its bytesReady() as 1112.

We're a real-time audio application with client and server components, so not getting the callback with the right amount of data on the right interval throws off communication with the server.

This appears to be hardware dependent. We have another USB adapter that when plugged in calls readyRead() with 1024 bytes each time. For now since our Audio is on a separate thread anyhow I may run my own while loop with a sleep to see if that gives me the right amount of data in the buffer.