I wonder if Analog Devices provides an USB to I2S audio bridge? Either as one component or as a combination. It should handle USB 2, PCM 352/384 32 bit and DSD128 to PCM 176. On the other end there is a DSP (ADAU1467) running at 192/32. Audio direction is only from USB host to DSP. Since the DSP is running at 192, the bridge must be able to perform the sample rate conversion of the PCM stream down to 176/192.
I have done some searching and as far as I can see I will need to source the USB interface from other supplier but eventually there is some Analog Device solution that will be able to take care of the down sampling to match the sample rate of the DSP. Am I correct?