+ USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
+ uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
+ * must be \ref AUDIO_DSUBTYPE_CSInterface_FormatType.
+ */
+
+ uint8_t FormatType; /**< Format of the audio stream, see Audio Device Formats specification. */
+ uint8_t Channels; /**< Total number of discrete channels in the stream. */
+
+ uint8_t SubFrameSize; /**< Size in bytes of each channel's sample data in the stream. */
+ uint8_t BitResolution; /**< Bits of resolution of each channel's samples in the stream. */
+
+ uint8_t SampleFrequencyType; /**< Total number of sample frequencies supported by the device. */
+ USB_Audio_SampleFreq_t SampleFrequencies[AUDIO_TOTAL_SAMPLE_RATES]; /**< Sample frequencies supported by the device (must be 24-bit). */
+ } USB_Audio_Descriptor_Format_t;
+
+ /** \brief Audio class-specific Format Descriptor (USB-IF naming conventions).
+ *
+ * Type define for an Audio class-specific audio format descriptor. This is used to give the host full details
+ * about the number of channels, the sample resolution, acceptable sample frequencies and encoding method used
+ * in the device's audio streams. See the USB Audio specification for more details.
+ *
+ * \see \ref USB_Audio_Descriptor_Format_t for the version of this type with non-standard LUFA specific
+ * element names.
+ */
+ typedef struct
+ {
+ uint8_t bLength; /**< Size of the descriptor, in bytes. */
+ uint8_t bDescriptorType; /**< Sub type value used to distinguish between audio class-specific descriptors,
+ * must be \ref AUDIO_DSUBTYPE_CSInterface_FormatType.
+ */
+
+ uint8_t bDescriptorSubtype;/**< Sub type value used to distinguish between audio class-specific descriptors,
+ * a value from the \ref Audio_CSInterface_AS_SubTypes_t enum.
+ */
+
+ uint8_t bFormatType; /**< Format of the audio stream, see Audio Device Formats specification. */
+ uint8_t bNrChannels; /**< Total number of discrete channels in the stream. */
+
+ uint8_t bSubFrameSize; /**< Size in bytes of each channel's sample data in the stream. */
+ uint8_t bBitResolution; /**< Bits of resolution of each channel's samples in the stream. */
+
+ uint8_t bSampleFrequencyType; /**< Total number of sample frequencies supported by the device. */
+ uint8_t SampleFrequencies[AUDIO_TOTAL_SAMPLE_RATES * 3]; /**< Sample frequencies supported by the device (must be 24-bit). */
+ } USB_Audio_StdDescriptor_Format_t;
+
+ /** \brief Audio class-specific Streaming Endpoint Descriptor (LUFA naming conventions).
+ *
+ * Type define for an Audio class-specific endpoint descriptor. This contains a regular endpoint
+ * descriptor with a few Audio-class-specific extensions. See the USB Audio specification for more details.
+ *
+ * \see \ref USB_Audio_StdDescriptor_StreamEndpoint_Std_t for the version of this type with standard element names.
+ */
+ typedef struct
+ {
+ USB_Descriptor_Endpoint_t Endpoint; /**< Standard endpoint descriptor describing the audio endpoint. */
+
+ uint8_t Refresh; /**< Always set to zero for Audio class devices. */
+ uint8_t SyncEndpointNumber; /**< Endpoint address to send synchronization information to, if needed (zero otherwise). */
+ } USB_Audio_Descriptor_StreamEndpoint_Std_t;
+
+ /** \brief Audio class-specific Streaming Endpoint Descriptor (USB-IF naming conventions).
+ *
+ * Type define for an Audio class-specific endpoint descriptor. This contains a regular endpoint
+ * descriptor with a few Audio-class-specific extensions. See the USB Audio specification for more details.
+ *
+ * \see \ref USB_Audio_Descriptor_StreamEndpoint_Std_t for the version of this type with non-standard LUFA specific
+ * element names.
+ */
+ typedef struct
+ {
+ uint8_t bLength; /**< Size of the descriptor, in bytes. */
+ uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a
+ * value given by the specific class.
+ */
+ uint8_t bEndpointAddress; /**< Logical address of the endpoint within the device for the current
+ * configuration, including direction mask.
+ */
+ uint8_t bmAttributes; /**< Endpoint attributes, comprised of a mask of the endpoint type (\c EP_TYPE_*)
+ * and attributes (\c ENDPOINT_ATTR_*) masks.
+ */
+ uint16_t wMaxPacketSize; /**< Size of the endpoint bank, in bytes. This indicates the maximum packet size
+ * that the endpoint can receive at a time.
+ */
+ uint8_t bInterval; /**< Polling interval in milliseconds for the endpoint if it is an INTERRUPT or
+ * ISOCHRONOUS type.
+ */
+
+ uint8_t bRefresh; /**< Always set to zero for Audio class devices. */
+ uint8_t bSynchAddress; /**< Endpoint address to send synchronization information to, if needed (zero otherwise). */
+ } USB_Audio_StdDescriptor_StreamEndpoint_Std_t;
+
+ /** \brief Audio class-specific Extended Endpoint Descriptor (LUFA naming conventions).
+ *
+ * Type define for an Audio class-specific extended endpoint descriptor. This contains extra information
+ * on the usage of endpoints used to stream audio in and out of the USB Audio device, and follows an Audio
+ * class-specific extended endpoint descriptor. See the USB Audio specification for more details.
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