Advertise only the implemented 32, 44.1 and 48 kHz stereo formats. Add
128-byte packets at 32 kHz and wrap the 44.1 kHz cadence at ten packets;
a uint8_t wrap at 256 otherwise emits extra samples every cycle.
Use the serialized UAC header length (including baInterfaceNr), maintain
the active alternate setting, accept alt 0 on non-streaming interfaces,
and retain the last valid sample rate when a SET_CUR request is rejected.
Change-Id: I41dab55fc0c7d2e6474492f97062e9838bc3aebf
iap-serial was hardcoded to return "ROCKBOX", and it was
not implemented at all in iap-usb.
Extend the iap-serial implementation to return the contents of
<ROCKBOX_DIR>/playername.txt, or "Rockbox" if there is an error
opening/reading that file.
And cut-n-paste this into the iap-usb side of things
Change-Id: I9d328be390b4cc8bd92237f996c41ef1e5e19724
add class driver source files.
also register iap audio sink.
usbstack/iap/libiap directory is imported from libiap.
Change-Id: I776c5caec33fe9efadc448e2e3b37d500bf19c9f
