+
+ /** \brief Audio class-specific Interface Descriptor (LUFA naming conventions).
+ *
+ * Type define for an Audio class-specific interface descriptor. This follows a regular interface descriptor to
+ * supply extra information about the audio device's layout to the host. See the USB Audio specification for more
+ * details.
+ *
+ * \see \ref USB_Audio_StdDescriptor_Interface_AC_t for the version of this type with standard element names.
+ */
+ typedef struct
+ {
+ 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,
+ * a value from the \ref Audio_CSInterface_AS_SubTypes_t enum.
+ */
+
+ uint16_t ACSpecification; /**< Binary coded decimal value, indicating the supported Audio Class specification version. */
+ uint16_t TotalLength; /**< Total length of the Audio class-specific descriptors, including this descriptor. */
+
+ uint8_t InCollection; /**< Total number of Audio Streaming interfaces linked to this Audio Control interface (must be 1). */
+ uint8_t InterfaceNumber; /**< Interface number of the associated Audio Streaming interface. */
+ } USB_Audio_Descriptor_Interface_AC_t;
+
+ /** \brief Audio class-specific Interface Descriptor (USB-IF naming conventions).
+ *
+ * Type define for an Audio class-specific interface descriptor. This follows a regular interface descriptor to
+ * supply extra information about the audio device's layout to the host. See the USB Audio specification for more
+ * details.
+ *
+ * \see \ref USB_Audio_Descriptor_Interface_AC_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 bDescriptorSubtype;/**< Sub type value used to distinguish between audio class-specific descriptors,
+ * a value from the \ref Audio_CSInterface_AS_SubTypes_t enum.
+ */
+
+ uint16_t bcdADC; /**< Binary coded decimal value, indicating the supported Audio Class specification version. */
+ uint16_t wTotalLength; /**< Total length of the Audio class-specific descriptors, including this descriptor. */
+
+ uint8_t bInCollection; /**< Total number of Audio Streaming interfaces linked to this Audio Control interface (must be 1). */
+ uint8_t bInterfaceNumbers; /**< Interface number of the associated Audio Streaming interface. */
+ } USB_Audio_StdDescriptor_Interface_AC_t;
+
+ /** \brief Audio class-specific Feature Unit Descriptor (LUFA naming conventions).
+ *
+ * Type define for an Audio class-specific Feature Unit descriptor. This indicates to the host what features
+ * are present in the device's audio stream for basic control, such as per-channel volume. See the USB Audio
+ * specification for more details.
+ *
+ * \see \ref USB_Audio_StdDescriptor_FeatureUnit_t for the version of this type with standard element names.
+ */
+ typedef struct
+ {
+ 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_Feature.
+ */
+
+ uint8_t UnitID; /**< ID value of this feature unit - must be a unique value within the device. */
+ uint8_t SourceID; /**< Source ID value of the audio source input into this feature unit. */
+
+ uint8_t ControlSize; /**< Size of each element in the ChanelControlls array. */
+ uint8_t ChannelControls[3]; /**< Feature masks for the control channel, and each separate audio channel. */
+
+ uint8_t FeatureUnitStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
+ } USB_Audio_Descriptor_FeatureUnit_t;
+
+ /** \brief Audio class-specific Feature Unit Descriptor (USB-IF naming conventions).
+ *
+ * Type define for an Audio class-specific Feature Unit descriptor. This indicates to the host what features
+ * are present in the device's audio stream for basic control, such as per-channel volume. See the USB Audio
+ * specification for more details.
+ *
+ * \see \ref USB_Audio_Descriptor_FeatureUnit_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 bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
+ * must be \ref AUDIO_DSUBTYPE_CSInterface_Feature.
+ */
+
+ uint8_t bUnitID; /**< ID value of this feature unit - must be a unique value within the device. */
+ uint8_t bSourceID; /**< Source ID value of the audio source input into this feature unit. */
+
+ uint8_t bControlSize; /**< Size of each element in the ChanelControlls array. */
+ uint8_t bmaControls[3]; /**< Feature masks for the control channel, and each separate audio channel. */
+
+ uint8_t iFeature; /**< Index of a string descriptor describing this descriptor within the device. */
+ } USB_Audio_StdDescriptor_FeatureUnit_t;
+
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