MakefileBasedBuild/Atmel/sam3x/sam3x-ek/libraries/usb_device/class/audio/usb_protocol_audio.h - device/google/accessory/adk2012_demo - Git at Google

 /**
  * \file
  *
  * \brief USB Audio Class 1.0 protocol definitions.
  *
  * Copyright (C) 2010 Atmel Corporation. All rights reserved.
  *
  * \page License
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice,
  * this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  * this list of conditions and the following disclaimer in the documentation
  * and/or other materials provided with the distribution.
  *
  * 3. The name of Atmel may not be used to endorse or promote products derived
  * from this software without specific prior written permission.
  *
  * 4. This software may only be redistributed and used in connection with an
  * Atmel AVR product.
  *
  * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
  * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  * DAMAGE.
  */

 #ifndef _USB_PROTOCOL_AUDIO_H_
 #define _USB_PROTOCOL_AUDIO_H_

 /**
  * \ingroup usb_protocol_group
  * \defgroup usb_audio_protocol USB Audio Class protocol definitions
  *
  * @{
  */

 /**
  * \name Possible Class value
  */
 //@{
 #define AUDIO_CLASS                       0x01
 //@}

 //! \name USB Audio Subclass IDs
 //@{
 #define AUDIO_SUBCLASS_CONTROL            0x01
 #define AUDIO_SUBCLASS_STREAMING          0x02
 //@}

 //! \name USB Audio Functional Descriptor Types
 //@{
 #define AUDIO_CS_INTERFACE                0x24	//!< Interface Functional Descriptor
 #define AUDIO_CS_ENDPOINT                 0x25	//!< Endpoint Functional Descriptor
 //@}

 //! \name USB Audio Control Functional Descriptor Subtypes
 //@{
 #define AUDIO_CS_INTERFACE_HEADER         0x01
 #define AUDIO_CS_INTERFACE_TERMINAL_IN    0x02
 #define AUDIO_CS_INTERFACE_TERMINAL_OUT   0x03
 #define AUDIO_CS_INTERFACE_MIXER          0x04
 #define AUDIO_CS_INTERFACE_SELECTER       0x05
 #define AUDIO_CS_INTERFACE_FEATURE        0x06
 #define AUDIO_CS_INTERFACE_PROCESSING     0x07
 #define AUDIO_CS_INTERFACE_EXTENSION      0x08
 #define AUDIO_CS_INTERFACE_FORMAT         0x02
 //@}

 //! \name USB Audio Streaming Functional Descriptor Subtypes
 //@{
 #define AUDIO_CS_INTERFACE_GENERAL        0x01
 #define AUDIO_CS_INTERFACE_FORMATSPECIFIC 0x03
 //@}

 //! \name USB Audio Terminal Descriptor Types
 //@{
 #define AUDIO_TERMINAL_UNDEFINED           0x0100
 #define AUDIO_TERMINAL_STREAMING           0x0101
 #define AUDIO_TERMINAL_VENDOR              0x01FF
 #define AUDIO_TERMINAL_IN_UNDEFINED        0x0200
 #define AUDIO_TERMINAL_IN_MIC              0x0201
 #define AUDIO_TERMINAL_IN_DESKTOP_MIC      0x0202
 #define AUDIO_TERMINAL_IN_PERSONAL_MIC     0x0203
 #define AUDIO_TERMINAL_IN_OMNIDIR_MIC      0x0204
 #define AUDIO_TERMINAL_IN_MIC_ARRAY        0x0205
 #define AUDIO_TERMINAL_IN_PROCESSING_MIC   0x0206
 #define AUDIO_TERMINAL_IN_OUT_UNDEFINED    0x0300
 #define AUDIO_TERMINAL_OUT_SPEAKER         0x0301
 #define AUDIO_TERMINAL_OUT_HEADPHONES      0x0302
 #define AUDIO_TERMINAL_OUT_HEAD_MOUNTED    0x0303
 #define AUDIO_TERMINAL_OUT_DESKTOP         0x0304
 #define AUDIO_TERMINAL_OUT_ROOM            0x0305
 #define AUDIO_TERMINAL_OUT_COMMUNICATION   0x0306
 #define AUDIO_TERMINAL_OUT_LOWFREQ         0x0307
 //@}

 //! \name USB Audio Channel Types
 //@{
 #define AUDIO_CHANNEL_LEFT_FRONT           (1 << 0)
 #define AUDIO_CHANNEL_RIGHT_FRONT          (1 << 1)
 #define AUDIO_CHANNEL_CENTER_FRONT         (1 << 2)
 #define AUDIO_CHANNEL_LOW_FREQ_ENHANCE     (1 << 3)
 #define AUDIO_CHANNEL_LEFT_SURROUND        (1 << 4)
 #define AUDIO_CHANNEL_RIGHT_SURROUND       (1 << 5)
 #define AUDIO_CHANNEL_LEFT_OF_CENTER       (1 << 6)
 #define AUDIO_CHANNEL_RIGHT_OF_CENTER      (1 << 7)
 #define AUDIO_CHANNEL_SURROUND             (1 << 8)
 #define AUDIO_CHANNEL_SIDE_LEFT            (1 << 9)
 #define AUDIO_CHANNEL_SIDE_RIGHT           (1 << 10)
 #define AUDIO_CHANNEL_TOP                  (1 << 11)
 //@}

 //! \name Audio Feature Unit Control Indexes
 //@{
 #define AUDIO_CONTROL_MUTE                 1
 #define AUDIO_CONTROL_VOLUME               2
 #define AUDIO_CONTROL_BASS                 3
 #define AUDIO_CONTROL_MID                  4
 #define AUDIO_CONTROL_TREBLE               5
 #define AUDIO_CONTROL_GRAPHIC_EQ           6
 #define AUDIO_CONTROL_AUTO_GAIN            7
 #define AUDIO_CONTROL_DELAY                8
 #define AUDIO_CONTROL_BASS_BOOST           9
 #define AUDIO_CONTROL_LOUDNESS             A
 //@}

 //! \name Audio Feature Unit Control Masks
 //@{
 #define AUDIO_FEATURE_MUTE                 (1 << 0)
 #define AUDIO_FEATURE_VOLUME               (1 << 1)
 #define AUDIO_FEATURE_BASS                 (1 << 2)
 #define AUDIO_FEATURE_MID                  (1 << 3)
 #define AUDIO_FEATURE_TREBLE               (1 << 4)
 #define AUDIO_FEATURE_GRAPHIC_EQ           (1 << 5)
 #define AUDIO_FEATURE_AUTO_GAIN            (1 << 6)
 #define AUDIO_FEATURE_DELAY                (1 << 7)
 #define AUDIO_FEATURE_BASS_BOOST           (1 << 8)
 #define AUDIO_FEATURE_LOUDNESS             (1 << 9)
 //@}

 //! \name Standard Endpoint Descriptor Types
 //@{
 #define ENDPOINT_ATTR_NO_SYNC              (0x00 << 2)
 #define ENDPOINT_ATTR_ASYNCHRONOUS         (0x01 << 2)
 #define ENDPOINT_ATTR_ADAPTIVE             (0x02 << 2)
 #define ENDPOINT_ATTR_SYNCHRONOUS          (0x03 << 2)
 //@}

 //! \name USB CDC Request IDs
 //@{
 #define USB_REQ_AUDIO_SET_CUR              0x01
 #define USB_REQ_AUDIO_SET_MIN              0x02
 #define USB_REQ_AUDIO_SET_MAX              0x03
 #define USB_REQ_AUDIO_SET_RES              0x04
 #define USB_REQ_AUDIO_SET_MEM              0x05
 #define USB_REQ_AUDIO_GET_CUR              0x81
 #define USB_REQ_AUDIO_GET_MIN              0x82
 #define USB_REQ_AUDIO_GET_MAX              0x83
 #define USB_REQ_AUDIO_GET_RES              0x84
 #define USB_REQ_AUDIO_GET_MEM              0x85
 //@}


 /*
  * Need to pack structures tightly, or the compiler might insert padding
  * and violate the spec-mandated layout.
  */
 COMPILER_PACK_SET(1);

 //! \name USB CDC Descriptors
 //@{

 //! Audio Header Class Specific Control Interface Descriptor
 typedef struct {
 	uint8_t  bLength;
     uint8_t  bDescriptorType;
     uint8_t  bDescriptorSubtype;
 	uint16_t bcdADC;
 	uint16_t wTotalLength;
 	uint8_t  bInCollection;
 	uint8_t  bInterfaceNumbers;
 } usb_audio_ifacecspc_desc_t;

 //! Audio Header Class Specific Feature Unit Descriptor
 typedef struct {
 	uint8_t  bLength;
 	uint8_t  bDescriptorType;
 	uint8_t  bDescriptorSubtype;
 	uint8_t  bUnitID;
 	uint8_t  bSourceID;
 	uint8_t  bControlSize;
 	uint16_t bmaControls[1];
 	uint8_t  iFeature;
 } usb_audio_feature_desc_t;

 //! Audio Header Class Specific Input Terminal Descriptor
 typedef struct {
 	uint8_t  bLength;
 	uint8_t  bDescriptorType;
 	uint8_t  bDescriptorSubtype;
 	uint8_t  bTerminalID;
 	uint16_t wTerminalType;
 	uint8_t  bAssocTerminal;
 	uint8_t  bNrChannels;
 	uint16_t wChannelConfig;
 	uint8_t  iChannelNames;
 	uint8_t  iTerminal;
 } usb_audio_input_terminal_desc_t;

 //! Audio Header Class Specific Output Terminal Descriptor
 typedef struct {
 	uint8_t  bLength;
 	uint8_t  bDescriptorType;
 	uint8_t  bDescriptorSubtype;
 	uint8_t  bTerminalID;
 	uint16_t wTerminalType;
 	uint8_t  bAssocTerminal;
 	uint8_t  bSourceID;
 	uint8_t  iTerminal;
 } usb_audio_output_terminal_desc_t;

 //! Audio Header Class Specific Streaming Interface Descriptor
 typedef struct {
 	uint8_t  bLength;
 	uint8_t  bDescriptorType;
 	uint8_t  bDescriptorSubtype;
 	uint8_t  bTerminalLink;
 	uint8_t  bDelay;
 	uint16_t wFormatTag;
 } usb_audio_ifacedspc_desc_t;

 //! Audio Header Class Specific Audio Format Descriptor
 typedef struct {
 	uint8_t bLength;
 	uint8_t bDescriptorType;
 	uint8_t bDescriptorSubtype;
 	uint8_t bFormatType;
 	uint8_t bNrChannels;
 	uint8_t bSubFrameSize;
 	uint8_t bBitResolution;
 	uint8_t bSampleFrequencyType;
 	uint8_t SampleFrequencies[1 * 3];
 } usb_audio_format_desc_t;

 //! Audio Header Class Specific Extended Endpoint Descriptor
 typedef struct {
 	usb_ep_desc_t ep;
 	uint8_t bRefresh;
 	uint8_t bSynchAddress;
 } usb_audio_ep_desc_t;

 //! Audio Header Class Specific Endpoint Descriptor
 typedef struct {
 	uint8_t  bLength;
 	uint8_t  bDescriptorType;
 	uint8_t  bDescriptorSubtype;
 	uint8_t  bmAttributes;
 	uint8_t  bLockDelayUnits;
 	uint16_t wLockDelay;
 } usb_audio_epspc_desc_t;

 //@}

 COMPILER_PACK_RESET();

 //@}

 #endif // _USB_PROTOCOL_AUDIO_H_
	/**
	* \file
	*
	* \brief USB Audio Class 1.0 protocol definitions.
	*
	* Copyright (C) 2010 Atmel Corporation. All rights reserved.
	*
	* \page License
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	*
	* 3. The name of Atmel may not be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* 4. This software may only be redistributed and used in connection with an
	* Atmel AVR product.
	*
	* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
	* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
	* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
	* DAMAGE.
	*/

	#ifndef _USB_PROTOCOL_AUDIO_H_
	#define _USB_PROTOCOL_AUDIO_H_

	/**
	* \ingroup usb_protocol_group
	* \defgroup usb_audio_protocol USB Audio Class protocol definitions
	*
	* @{
	*/

	/**
	* \name Possible Class value
	*/
	//@{
	#define AUDIO_CLASS 0x01
	//@}

	//! \name USB Audio Subclass IDs
	//@{
	#define AUDIO_SUBCLASS_CONTROL 0x01
	#define AUDIO_SUBCLASS_STREAMING 0x02
	//@}

	//! \name USB Audio Functional Descriptor Types
	//@{
	#define AUDIO_CS_INTERFACE 0x24 //!< Interface Functional Descriptor
	#define AUDIO_CS_ENDPOINT 0x25 //!< Endpoint Functional Descriptor
	//@}

	//! \name USB Audio Control Functional Descriptor Subtypes
	//@{
	#define AUDIO_CS_INTERFACE_HEADER 0x01
	#define AUDIO_CS_INTERFACE_TERMINAL_IN 0x02
	#define AUDIO_CS_INTERFACE_TERMINAL_OUT 0x03
	#define AUDIO_CS_INTERFACE_MIXER 0x04
	#define AUDIO_CS_INTERFACE_SELECTER 0x05
	#define AUDIO_CS_INTERFACE_FEATURE 0x06
	#define AUDIO_CS_INTERFACE_PROCESSING 0x07
	#define AUDIO_CS_INTERFACE_EXTENSION 0x08
	#define AUDIO_CS_INTERFACE_FORMAT 0x02
	//@}

	//! \name USB Audio Streaming Functional Descriptor Subtypes
	//@{
	#define AUDIO_CS_INTERFACE_GENERAL 0x01
	#define AUDIO_CS_INTERFACE_FORMATSPECIFIC 0x03
	//@}

	//! \name USB Audio Terminal Descriptor Types
	//@{
	#define AUDIO_TERMINAL_UNDEFINED 0x0100
	#define AUDIO_TERMINAL_STREAMING 0x0101
	#define AUDIO_TERMINAL_VENDOR 0x01FF
	#define AUDIO_TERMINAL_IN_UNDEFINED 0x0200
	#define AUDIO_TERMINAL_IN_MIC 0x0201
	#define AUDIO_TERMINAL_IN_DESKTOP_MIC 0x0202
	#define AUDIO_TERMINAL_IN_PERSONAL_MIC 0x0203
	#define AUDIO_TERMINAL_IN_OMNIDIR_MIC 0x0204
	#define AUDIO_TERMINAL_IN_MIC_ARRAY 0x0205
	#define AUDIO_TERMINAL_IN_PROCESSING_MIC 0x0206
	#define AUDIO_TERMINAL_IN_OUT_UNDEFINED 0x0300
	#define AUDIO_TERMINAL_OUT_SPEAKER 0x0301
	#define AUDIO_TERMINAL_OUT_HEADPHONES 0x0302
	#define AUDIO_TERMINAL_OUT_HEAD_MOUNTED 0x0303
	#define AUDIO_TERMINAL_OUT_DESKTOP 0x0304
	#define AUDIO_TERMINAL_OUT_ROOM 0x0305
	#define AUDIO_TERMINAL_OUT_COMMUNICATION 0x0306
	#define AUDIO_TERMINAL_OUT_LOWFREQ 0x0307
	//@}

	//! \name USB Audio Channel Types
	//@{
	#define AUDIO_CHANNEL_LEFT_FRONT (1 << 0)
	#define AUDIO_CHANNEL_RIGHT_FRONT (1 << 1)
	#define AUDIO_CHANNEL_CENTER_FRONT (1 << 2)
	#define AUDIO_CHANNEL_LOW_FREQ_ENHANCE (1 << 3)
	#define AUDIO_CHANNEL_LEFT_SURROUND (1 << 4)
	#define AUDIO_CHANNEL_RIGHT_SURROUND (1 << 5)
	#define AUDIO_CHANNEL_LEFT_OF_CENTER (1 << 6)
	#define AUDIO_CHANNEL_RIGHT_OF_CENTER (1 << 7)
	#define AUDIO_CHANNEL_SURROUND (1 << 8)
	#define AUDIO_CHANNEL_SIDE_LEFT (1 << 9)
	#define AUDIO_CHANNEL_SIDE_RIGHT (1 << 10)
	#define AUDIO_CHANNEL_TOP (1 << 11)
	//@}

	//! \name Audio Feature Unit Control Indexes
	//@{
	#define AUDIO_CONTROL_MUTE 1
	#define AUDIO_CONTROL_VOLUME 2
	#define AUDIO_CONTROL_BASS 3
	#define AUDIO_CONTROL_MID 4
	#define AUDIO_CONTROL_TREBLE 5
	#define AUDIO_CONTROL_GRAPHIC_EQ 6
	#define AUDIO_CONTROL_AUTO_GAIN 7
	#define AUDIO_CONTROL_DELAY 8
	#define AUDIO_CONTROL_BASS_BOOST 9
	#define AUDIO_CONTROL_LOUDNESS A
	//@}

	//! \name Audio Feature Unit Control Masks
	//@{
	#define AUDIO_FEATURE_MUTE (1 << 0)
	#define AUDIO_FEATURE_VOLUME (1 << 1)
	#define AUDIO_FEATURE_BASS (1 << 2)
	#define AUDIO_FEATURE_MID (1 << 3)
	#define AUDIO_FEATURE_TREBLE (1 << 4)
	#define AUDIO_FEATURE_GRAPHIC_EQ (1 << 5)
	#define AUDIO_FEATURE_AUTO_GAIN (1 << 6)
	#define AUDIO_FEATURE_DELAY (1 << 7)
	#define AUDIO_FEATURE_BASS_BOOST (1 << 8)
	#define AUDIO_FEATURE_LOUDNESS (1 << 9)
	//@}

	//! \name Standard Endpoint Descriptor Types
	//@{
	#define ENDPOINT_ATTR_NO_SYNC (0x00 << 2)
	#define ENDPOINT_ATTR_ASYNCHRONOUS (0x01 << 2)
	#define ENDPOINT_ATTR_ADAPTIVE (0x02 << 2)
	#define ENDPOINT_ATTR_SYNCHRONOUS (0x03 << 2)
	//@}

	//! \name USB CDC Request IDs
	//@{
	#define USB_REQ_AUDIO_SET_CUR 0x01
	#define USB_REQ_AUDIO_SET_MIN 0x02
	#define USB_REQ_AUDIO_SET_MAX 0x03
	#define USB_REQ_AUDIO_SET_RES 0x04
	#define USB_REQ_AUDIO_SET_MEM 0x05
	#define USB_REQ_AUDIO_GET_CUR 0x81
	#define USB_REQ_AUDIO_GET_MIN 0x82
	#define USB_REQ_AUDIO_GET_MAX 0x83
	#define USB_REQ_AUDIO_GET_RES 0x84
	#define USB_REQ_AUDIO_GET_MEM 0x85
	//@}


	/*
	* Need to pack structures tightly, or the compiler might insert padding
	* and violate the spec-mandated layout.
	*/
	COMPILER_PACK_SET(1);

	//! \name USB CDC Descriptors
	//@{

	//! Audio Header Class Specific Control Interface Descriptor
	typedef struct {
	uint8_t bLength;
	uint8_t bDescriptorType;
	uint8_t bDescriptorSubtype;
	uint16_t bcdADC;
	uint16_t wTotalLength;
	uint8_t bInCollection;
	uint8_t bInterfaceNumbers;
	} usb_audio_ifacecspc_desc_t;

	//! Audio Header Class Specific Feature Unit Descriptor
	typedef struct {
	uint8_t bLength;
	uint8_t bDescriptorType;
	uint8_t bDescriptorSubtype;
	uint8_t bUnitID;
	uint8_t bSourceID;
	uint8_t bControlSize;
	uint16_t bmaControls[1];
	uint8_t iFeature;
	} usb_audio_feature_desc_t;

	//! Audio Header Class Specific Input Terminal Descriptor
	typedef struct {
	uint8_t bLength;
	uint8_t bDescriptorType;
	uint8_t bDescriptorSubtype;
	uint8_t bTerminalID;
	uint16_t wTerminalType;
	uint8_t bAssocTerminal;
	uint8_t bNrChannels;
	uint16_t wChannelConfig;
	uint8_t iChannelNames;
	uint8_t iTerminal;
	} usb_audio_input_terminal_desc_t;

	//! Audio Header Class Specific Output Terminal Descriptor
	typedef struct {
	uint8_t bLength;
	uint8_t bDescriptorType;
	uint8_t bDescriptorSubtype;
	uint8_t bTerminalID;
	uint16_t wTerminalType;
	uint8_t bAssocTerminal;
	uint8_t bSourceID;
	uint8_t iTerminal;
	} usb_audio_output_terminal_desc_t;

	//! Audio Header Class Specific Streaming Interface Descriptor
	typedef struct {
	uint8_t bLength;
	uint8_t bDescriptorType;
	uint8_t bDescriptorSubtype;
	uint8_t bTerminalLink;
	uint8_t bDelay;
	uint16_t wFormatTag;
	} usb_audio_ifacedspc_desc_t;

	//! Audio Header Class Specific Audio Format Descriptor
	typedef struct {
	uint8_t bLength;
	uint8_t bDescriptorType;
	uint8_t bDescriptorSubtype;
	uint8_t bFormatType;
	uint8_t bNrChannels;
	uint8_t bSubFrameSize;
	uint8_t bBitResolution;
	uint8_t bSampleFrequencyType;
	uint8_t SampleFrequencies[1 * 3];
	} usb_audio_format_desc_t;

	//! Audio Header Class Specific Extended Endpoint Descriptor
	typedef struct {
	usb_ep_desc_t ep;
	uint8_t bRefresh;
	uint8_t bSynchAddress;
	} usb_audio_ep_desc_t;

	//! Audio Header Class Specific Endpoint Descriptor
	typedef struct {
	uint8_t bLength;
	uint8_t bDescriptorType;
	uint8_t bDescriptorSubtype;
	uint8_t bmAttributes;
	uint8_t bLockDelayUnits;
	uint16_t wLockDelay;
	} usb_audio_epspc_desc_t;

	//@}

	COMPILER_PACK_RESET();

	//@}

	#endif // _USB_PROTOCOL_AUDIO_H_