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Diffstat (limited to 'LUFA/Drivers/USB/Class/Common/Audio.h')
| -rw-r--r-- | LUFA/Drivers/USB/Class/Common/Audio.h | 701 |
1 files changed, 701 insertions, 0 deletions
diff --git a/LUFA/Drivers/USB/Class/Common/Audio.h b/LUFA/Drivers/USB/Class/Common/Audio.h new file mode 100644 index 0000000..a635947 --- /dev/null +++ b/LUFA/Drivers/USB/Class/Common/Audio.h @@ -0,0 +1,701 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2010.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ * \brief Common definitions and declarations for the library USB Audio 1.0 Class driver.
+ *
+ * Common definitions and declarations for the library USB Audio 1.0 Class driver.
+ *
+ * \note This file should not be included directly. It is automatically included as needed by the USB module driver
+ * dispatch header located in LUFA/Drivers/USB.h.
+ */
+
+/** \ingroup Group_USBClassAudio
+ * @defgroup Group_USBClassAudioCommon Common Class Definitions
+ *
+ * \section Module Description
+ * Constants, Types and Enum definitions that are common to both Device and Host modes for the USB
+ * Audio 1.0 Class.
+ *
+ * @{
+ */
+
+#ifndef _AUDIO_CLASS_COMMON_H_
+#define _AUDIO_CLASS_COMMON_H_
+
+ /* Includes: */
+ #include "../../HighLevel/StdDescriptors.h"
+
+ #include <string.h>
+
+ /* Enable C linkage for C++ Compilers: */
+ #if defined(__cplusplus)
+ extern "C" {
+ #endif
+
+ /* Preprocessor Checks: */
+ #if !defined(__INCLUDE_FROM_AUDIO_DRIVER)
+ #error Do not include this file directly. Include LUFA/Drivers/USB.h instead.
+ #endif
+
+ /* Macros: */
+ #if !defined(AUDIO_TOTAL_SAMPLE_RATES) || defined(__DOXYGEN__)
+ /** Total number of discrete audio sample rates supported by the device. This value can be overridden by defining this
+ * token in the project makefile to the desired value, and passing it to the compiler via the -D switch.
+ */
+ #define AUDIO_TOTAL_SAMPLE_RATES 1
+ #endif
+
+ /** \name Audio Channel Masks */
+ //@{
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_LEFT_FRONT (1 << 0)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_RIGHT_FRONT (1 << 1)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_CENTER_FRONT (1 << 2)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_LOW_FREQ_ENHANCE (1 << 3)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_LEFT_SURROUND (1 << 4)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_RIGHT_SURROUND (1 << 5)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_LEFT_OF_CENTER (1 << 6)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_RIGHT_OF_CENTER (1 << 7)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_SURROUND (1 << 8)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_SIDE_LEFT (1 << 9)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_SIDE_RIGHT (1 << 10)
+
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_CHANNEL_TOP (1 << 11)
+ //@}
+
+ /** \name Audio Feature Masks */
+ //@{
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+ #define AUDIO_FEATURE_MUTE (1 << 0)
+
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+ #define AUDIO_FEATURE_VOLUME (1 << 1)
+
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+ #define AUDIO_FEATURE_BASS (1 << 2)
+
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+ #define AUDIO_FEATURE_MID (1 << 3)
+
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+ #define AUDIO_FEATURE_TREBLE (1 << 4)
+
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+ #define AUDIO_FEATURE_GRAPHIC_EQUALIZER (1 << 5)
+
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+ #define AUDIO_FEATURE_AUTOMATIC_GAIN (1 << 6)
+
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+ #define AUDIO_FEATURE_DELAY (1 << 7)
+
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+ #define AUDIO_FEATURE_BASS_BOOST (1 << 8)
+
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+ #define AUDIO_FEATURE_BASS_LOUDNESS (1 << 9)
+ //@}
+
+ /** \name Audio Terminal Types */
+ //@{
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_UNDEFINED 0x0100
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_STREAMING 0x0101
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_VENDOR 0x01FF
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_IN_UNDEFINED 0x0200
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_IN_MIC 0x0201
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_IN_DESKTOP_MIC 0x0202
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_IN_PERSONAL_MIC 0x0203
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_IN_OMNIDIR_MIC 0x0204
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_IN_MIC_ARRAY 0x0205
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_IN_PROCESSING_MIC 0x0206
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_IN_OUT_UNDEFINED 0x0300
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_OUT_SPEAKER 0x0301
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_OUT_HEADPHONES 0x0302
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_OUT_HEAD_MOUNTED 0x0303
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_OUT_DESKTOP 0x0304
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_OUT_ROOM 0x0305
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_OUT_COMMUNICATION 0x0306
+
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+ #define AUDIO_TERMINAL_OUT_LOWFREQ 0x0307
+ //@}
+
+ /** Convenience macro to fill a 24-bit \ref USB_Audio_SampleFreq_t structure with the given sample rate as a 24-bit number.
+ *
+ * \param[in] freq Required audio sampling frequency in HZ
+ */
+ #define AUDIO_SAMPLE_FREQ(freq) {((uint32_t)freq & 0x00FFFF), (((uint32_t)freq >> 16) & 0x0000FF)}
+
+ /** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint
+ * accepts only filled endpoint packets of audio samples.
+ */
+ #define AUDIO_EP_FULL_PACKETS_ONLY (1 << 7)
+
+ /** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint
+ * will accept partially filled endpoint packets of audio samples.
+ */
+ #define AUDIO_EP_ACCEPTS_SMALL_PACKETS (0 << 7)
+
+ /* Enums: */
+ /** Enum for possible Class, Subclass and Protocol values of device and interface descriptors relating to the Audio
+ * device class.
+ */
+ enum Audio_Descriptor_ClassSubclassProtocol_t
+ {
+ AUDIO_CSCP_AudioClass = 0x01, /**< Descriptor Class value indicating that the device or
+ * interface belongs to the USB Audio 1.0 class.
+ */
+ AUDIO_CSCP_ControlSubclass = 0x01, /**< Descriptor Subclass value indicating that the device or
+ * interface belongs to the Audio Control subclass.
+ */
+ AUDIO_CSCP_ControlProtocol = 0x00, /**< Descriptor Protocol value indicating that the device or
+ * interface belongs to the Audio Control protocol.
+ */
+ AUDIO_CSCP_AudioStreamingSubclass = 0x02, /**< Descriptor Subclass value indicating that the device or
+ * interface belongs to the MIDI Streaming subclass.
+ */
+ AUDIO_CSCP_MIDIStreamingSubclass = 0x03, /**< Descriptor Subclass value indicating that the device or
+ * interface belongs to the Audio streaming subclass.
+ */
+ AUDIO_CSCP_StreamingProtocol = 0x00, /**< Descriptor Protocol value indicating that the device or
+ * interface belongs to the Streaming Audio protocol.
+ */
+ };
+
+ /** Audio class specific interface description subtypes, for the Audio Control interface. */
+ enum Audio_CSInterface_AC_SubTypes_t
+ {
+ AUDIO_DSUBTYPE_CSInterface_Header = 0x01, /**< Audio class specific control interface header. */
+ AUDIO_DSUBTYPE_CSInterface_InputTerminal = 0x02, /**< Audio class specific control interface Input Terminal. */
+ AUDIO_DSUBTYPE_CSInterface_OutputTerminal = 0x03, /**< Audio class specific control interface Output Terminal. */
+ AUDIO_DSUBTYPE_CSInterface_Mixer = 0x04, /**< Audio class specific control interface Mixer Unit. */
+ AUDIO_DSUBTYPE_CSInterface_Selector = 0x05, /**< Audio class specific control interface Selector Unit. */
+ AUDIO_DSUBTYPE_CSInterface_Feature = 0x06, /**< Audio class specific control interface Feature Unit. */
+ AUDIO_DSUBTYPE_CSInterface_Processing = 0x07, /**< Audio class specific control interface Processing Unit. */
+ AUDIO_DSUBTYPE_CSInterface_Extension = 0x08, /**< Audio class specific control interface Extension Unit. */
+ };
+
+ /** Audio class specific interface description subtypes, for the Audio Streaming interface. */
+ enum Audio_CSInterface_AS_SubTypes_t
+ {
+ AUDIO_DSUBTYPE_CSInterface_General = 0x01, /**< Audio class specific streaming interface general descriptor. */
+ AUDIO_DSUBTYPE_CSInterface_FormatType = 0x02, /**< Audio class specific streaming interface format type descriptor. */
+ AUDIO_DSUBTYPE_CSInterface_FormatSpecific = 0x03, /**< Audio class specific streaming interface format information descriptor. */
+ };
+
+ /** Audio class specific endpoint description subtypes, for the Audio Streaming interface. */
+ enum Audio_CSEndpoint_SubTypes_t
+ {
+ AUDIO_DSUBTYPE_CSEndpoint_General = 0x01, /**< Audio class specific endpoint general descriptor. */
+ };
+
+ /* Type Defines: */
+ /** \brief Audio class-specific Input Terminal Descriptor (LUFA naming conventions).
+ *
+ * Type define for an Audio class-specific input terminal descriptor. This indicates to the host that the device
+ * contains an input audio source, either from a physical terminal on the device, or a logical terminal (for example,
+ * a USB endpoint). See the USB Audio specification for more details.
+ *
+ * \see \ref USB_Audio_StdDescriptor_InputTerminal_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_InputTerminal.
+ */
+
+ uint8_t TerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */
+ uint16_t TerminalType; /**< Type of terminal, a TERMINAL_* mask. */
+ uint8_t AssociatedOutputTerminal; /**< ID of associated output terminal, for physically grouped terminals
+ * such as the speaker and microphone of a phone handset.
+ */
+ uint8_t TotalChannels; /**< Total number of separate audio channels within this interface (right, left, etc.) */
+ uint16_t ChannelConfig; /**< CHANNEL_* masks indicating what channel layout is supported by this terminal. */
+
+ uint8_t ChannelStrIndex; /**< Index of a string descriptor describing this channel within the device. */
+ uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
+ } USB_Audio_Descriptor_InputTerminal_t;
+
+ /** \brief Audio class-specific Input Terminal Descriptor (USB-IF naming conventions).
+ *
+ * Type define for an Audio class-specific input terminal descriptor. This indicates to the host that the device
+ * contains an input audio source, either from a physical terminal on the device, or a logical terminal (for example,
+ * a USB endpoint). See the USB Audio specification for more details.
+ *
+ * \see \ref USB_Audio_Descriptor_InputTerminal_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_InputTerminal.
+ */
+ uint8_t bTerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */
+ uint16_t wTerminalType; /**< Type of terminal, a TERMINAL_* mask. */
+ uint8_t bAssocTerminal; /**< ID of associated output terminal, for physically grouped terminals
+ * such as the speaker and microphone of a phone handset.
+ */
+ uint8_t bNrChannels; /**< Total number of separate audio channels within this interface (right, left, etc.) */
+ uint16_t wChannelConfig; /**< CHANNEL_* masks indicating what channel layout is supported by this terminal. */
+
+ uint8_t iChannelNames; /**< Index of a string descriptor describing this channel within the device. */
+ uint8_t iTerminal; /**< Index of a string descriptor describing this descriptor within the device. */
+ } USB_Audio_StdDescriptor_InputTerminal_t;
+
+ /** \brief Audio class-specific Output Terminal Descriptor (LUFA naming conventions).
+ *
+ * Type define for an Audio class-specific output terminal descriptor. This indicates to the host that the device
+ * contains an output audio sink, either to a physical terminal on the device, or a logical terminal (for example,
+ * a USB endpoint). See the USB Audio specification for more details.
+ *
+ * \see \ref USB_Audio_StdDescriptor_OutputTerminal_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_OutputTerminal.
+ */
+
+ uint8_t TerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */
+ uint16_t TerminalType; /**< Type of terminal, a TERMINAL_* mask. */
+ uint8_t AssociatedInputTerminal; /**< ID of associated input terminal, for physically grouped terminals
+ * such as the speaker and microphone of a phone handset.
+ */
+ uint8_t SourceID; /**< ID value of the unit this terminal's audio is sourced from. */
+
+ uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
+ } USB_Audio_Descriptor_OutputTerminal_t;
+
+ /** \brief Audio class-specific Output Terminal Descriptor (USB-IF naming conventions).
+ *
+ * Type define for an Audio class-specific output terminal descriptor. This indicates to the host that the device
+ * contains an output audio sink, either to a physical terminal on the device, or a logical terminal (for example,
+ * a USB endpoint). See the USB Audio specification for more details.
+ *
+ * \see \ref USB_Audio_Descriptor_OutputTerminal_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_OutputTerminal.
+ */
+
+ uint8_t bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
+ * a value from the \ref Audio_CSInterface_AC_SubTypes_t enum.
+ */
+ uint8_t bTerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */
+ uint16_t wTerminalType; /**< Type of terminal, a TERMINAL_* mask. */
+ uint8_t bAssocTerminal; /**< ID of associated input terminal, for physically grouped terminals
+ * such as the speaker and microphone of a phone handset.
+ */
+ uint8_t bSourceID; /**< ID value of the unit this terminal's audio is sourced from. */
+
+ uint8_t iTerminal; /**< Index of a string descriptor describing this descriptor within the device. */
+ } USB_Audio_StdDescriptor_OutputTerminal_t;
+
+ /** \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;
+
+ /** \brief Audio class-specific Streaming Audio Interface Descriptor (LUFA naming conventions).
+ *
+ * Type define for an Audio class-specific streaming interface descriptor. This indicates to the host
+ * how audio streams within the device are formatted. See the USB Audio specification for more details.
+ *
+ * \see \ref USB_Audio_StdDescriptor_Interface_AS_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.
+ */
+
+ uint8_t TerminalLink; /**< ID value of the output terminal this descriptor is describing. */
+
+ uint8_t FrameDelay; /**< Delay in frames resulting from the complete sample processing from input to output. */
+ uint16_t AudioFormat; /**< Format of the audio stream, see Audio Device Formats specification. */
+ } USB_Audio_Descriptor_Interface_AS_t;
+
+ /** \brief Audio class-specific Streaming Audio Interface Descriptor (USB-IF naming conventions).
+ *
+ * Type define for an Audio class-specific streaming interface descriptor. This indicates to the host
+ * how audio streams within the device are formatted. See the USB Audio specification for more details.
+ *
+ * \see \ref USB_Audio_Descriptor_Interface_AS_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.
+ */
+
+ uint8_t bTerminalLink; /**< ID value of the output terminal this descriptor is describing. */
+
+ uint8_t bDelay; /**< Delay in frames resulting from the complete sample processing from input to output. */
+ uint16_t wFormatTag; /**< Format of the audio stream, see Audio Device Formats specification. */
+ } USB_Audio_StdDescriptor_Interface_AS_t;
+
+ /** \brief 24-Bit Audio Frequency Structure.
+ *
+ * Type define for a 24bit audio sample frequency structure. GCC does not contain a built in 24bit datatype,
+ * this this structure is used to build up the value instead. Fill this structure with the \ref AUDIO_SAMPLE_FREQ() macro.
+ */
+ typedef struct
+ {
+ uint16_t LowWord; /**< Low 16 bits of the 24-bit value. */
+ uint8_t HighByte; /**< Upper 8 bits of the 24-bit value. */
+ } USB_Audio_SampleFreq_t;
+
+ /** \brief Audio class-specific Format Descriptor (LUFA 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_StdDescriptor_Format_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_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 (EP_TYPE_*)
+ * and attributes (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.
+ *
+ * \see \ref USB_Audio_StdDescriptor_StreamEndpoint_Spc_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_CSEndpoint_SubTypes_t enum.
+ */
+
+ uint8_t Attributes; /**< Audio class-specific endpoint attributes, such as ACCEPTS_SMALL_PACKETS. */
+
+ uint8_t LockDelayUnits; /**< Units used for the LockDelay field, see Audio class specification. */
+ uint16_t LockDelay; /**< Time required to internally lock endpoint's internal clock recovery circuitry. */
+ } USB_Audio_Descriptor_StreamEndpoint_Spc_t;
+
+ /** \brief Audio class-specific Extended Endpoint Descriptor (USB-IF 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.
+ *
+ * \see \ref USB_Audio_Descriptor_StreamEndpoint_Spc_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_CSEndpoint_SubTypes_t enum.
+ */
+
+ uint8_t bmAttributes; /**< Audio class-specific endpoint attributes, such as ACCEPTS_SMALL_PACKETS. */
+
+ uint8_t bLockDelayUnits; /**< Units used for the LockDelay field, see Audio class specification. */
+ uint16_t wLockDelay; /**< Time required to internally lock endpoint's internal clock recovery circuitry. */
+ } USB_Audio_StdDescriptor_StreamEndpoint_Spc_t;
+
+ /* Disable C linkage for C++ Compilers: */
+ #if defined(__cplusplus)
+ }
+ #endif
+
+#endif
+
+/** @} */
+
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