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U: usb_audio_feature_unit_descriptor_2ch; usb_audio_feature_unit_descriptor_body; usb_audio_feature_unit_descriptor_head; usb_audio_feature_unit_descriptor_tail; usb_audio_format_continuous_sampling_frequency; usb_audio_format_discrete_sampling_frequency; usb_audio_format_type1_descriptor_1freq; usb_audio_format_type1_descriptor_head; usb_audio_header_descriptor_body; usb_audio_header_descriptor_head; usb_audio_input_terminal_descriptor; usb_audio_output_terminal_descriptor; usb_audio_stream_audio_endpoint_descriptor; usb_audio_stream_endpoint_descriptor; usb_audio_stream_interface_descriptor; usb_cdc_acm_descriptor; usb_cdc_call_management_descriptor; usb_cdc_header_descriptor; usb_cdc_line_coding; usb_cdc_notification; usb_cdc_union_descriptor; usb_config_descriptor; usb_device_descriptor; usb_device_qualifier_descriptor; usb_endpoint_descriptor; usb_hid_descriptor; usb_iface_assoc_descriptor; usb_interface; usb_interface_descriptor; usb_midi_element_descriptor; usb_midi_element_descriptor_body; usb_midi_element_descriptor_head; usb_midi_element_descriptor_tail; usb_midi_endpoint_descriptor; usb_midi_endpoint_descriptor_body; usb_midi_endpoint_descriptor_head; usb_midi_header_descriptor; usb_midi_in_jack_descriptor; usb_midi_out_jack_descriptor; usb_midi_out_jack_descriptor_body; usb_midi_out_jack_descriptor_head; usb_midi_out_jack_descriptor_tail; usb_msc_cbw; usb_msc_csw; usb_msc_trans; usb_setup_data; usb_string_descriptor