CountAlternates
uint32 CountAlternates() const;
for (uint32 l = 0; !supported && l < intf->CountAlternates(); l++) {
for (uint32 i = 0; i < streaming->CountAlternates(); i++) {
for (uint32 alt = 0; alt < interface->CountAlternates(); alt++) {
for (uint32 j = 0; j < interface->CountAlternates(); j++) {
fAlternateCount = CountAlternates();