An alternate setting which specifies another format defined in FMT-2, or an unknown format, will be ignored. This section describes the features of the USB Audio 2.0 driver. The driver supports all entity types defined in ADC-2 3.13.Įach Terminal Entity must have a valid clock connection in compatible USB Audio 2.0 hardware. The clock path may optionally include Clock Multiplier and Clock Selector units and must end in a Clock Source Entity. The driver supports one single clock source only. If a device implements multiple clock source entities and a clock selector, then the driver will use the clock source that is selected by default and will not modify the clock selector’s position.Ī Processing Unit (ADC-2 3.13.9) with more than one input pin is not supported.Īn Extension Unit (ADC-2 3.13.10) with more than one input pin is not supported.Ĭyclic paths in the topology are not allowed. The driver supports the following endpoint synchronization types (USB-2 5.12.4.1):įor the asynchronous OUT case the driver supports explicit feedback only. A feedback endpoint must be implemented in the respective alternate setting of the AS interface. The driver does not support implicit feedback. There is currently limited support for devices using a shared clock for multiple endpoints.įor the Adaptive IN case the driver does not support a feedforward endpoint. If such an endpoint is present in the alternate setting, it will be ignored. The driver handles the Adaptive IN stream in the same way as an Asynchronous IN stream. The size of isochronous packets created by the device must be within the limits specified in FMT-2.0 section 2.3.1.1. This means that the deviation of actual packet size from nominal size must not exceed +/- one audio slot (audio slot = channel count samples). DescriptorsĪn audio function must implement exactly one AudioControl Interface Descriptor (ADC-2 4.7) and one or more AudioStreaming Interface Descriptors (ADC-2 4.9). A function with an audio control interface but no streaming interface is not supported. The driver supports all descriptor types defined in ADC-2, section 4. #BEHRINGER USB AUDIO DRIVER WINDOWS 10 FAILED WINDOWS 8#
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