16 files changed, 1484 insertions, 0 deletions
diff --git a/usb/common/audio/AUDControlInterfaceDescriptor.h b/usb/common/audio/AUDControlInterfaceDescriptor.h
new file mode 100644
index 0000000..ada2f1e
--- /dev/null
+++ b/usb/common/audio/AUDControlInterfaceDescriptor.h
@@ -0,0 +1,72 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+/// 
+/// Definitions for using USB %audio control interfaces.
+///
+/// !!!Usage
+/// 
+/// -# When declaring a standard USB interface descriptor for an %audio control
+///    interface, use the "USB Audio control interface codes" constants.
+//------------------------------------------------------------------------------
+
+#ifndef AUDCONTROLINTERFACEDESCRIPTOR_H
+#define AUDCONTROLINTERFACEDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio control interface codes"
+///
+/// This page lists the class, subclass and protocol codes that a USB Audio
+/// Control interface descriptor should display.
+/// 
+/// !Codes
+/// - AUDControlInterfaceDescriptor_CLASS
+/// - AUDControlInterfaceDescriptor_SUBCLASS
+/// - AUDControlInterfaceDescriptor_PROTOCOL
+
+/// Class code for an audio control interface.
+#define AUDControlInterfaceDescriptor_CLASS             0x01
+
+/// Subclass code for an audio control interface.
+#define AUDControlInterfaceDescriptor_SUBCLASS          0x01
+
+/// Protocol code for an audio control interface.
+#define AUDControlInterfaceDescriptor_PROTOCOL          0x00
+//------------------------------------------------------------------------------
+
+#endif //#ifndef AUDCONTROLINTERFACEDESCRIPTOR_H
+
diff --git a/usb/common/audio/AUDDataEndpointDescriptor.h b/usb/common/audio/AUDDataEndpointDescriptor.h
new file mode 100644
index 0000000..5963546
--- /dev/null
+++ b/usb/common/audio/AUDDataEndpointDescriptor.h
@@ -0,0 +1,104 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+/// 
+/// Definition of the USB audio-specific data endpoint descriptor.
+///
+/// !!!Usage
+/// 
+/// -# Declare an AUDDataEndpointDescriptor instance as part of the
+///    configuration descriptors of a USB %audio %device.
+//------------------------------------------------------------------------------
+
+#ifndef AUDDATAENDPOINTDESCRIPTOR_H
+#define AUDDATAENDPOINTDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+/// Descriptor subtype for an Audio data endpoint.
+#define AUDDataEndpointDescriptor_SUBTYPE                   0x01
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio Lock delay units"
+///
+/// This page lists the valid lock delay unit types.
+/// 
+/// !Units
+/// - AUDDataEndpointDescriptor_MILLISECONDS
+/// - AUDDataEndpointDescriptor_PCMSAMPLES
+
+/// Lock delay is expressed in milliseconds.
+#define AUDDataEndpointDescriptor_MILLISECONDS              1
+
+/// Lock delay is expressed in decoded PCM samples.
+#define AUDDataEndpointDescriptor_PCMSAMPLES                2
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Types
+//------------------------------------------------------------------------------
+
+#ifdef __ICCARM__          // IAR
+#pragma pack(1)            // IAR
+#define __attribute__(...) // IAR
+#endif                     // IAR
+
+//------------------------------------------------------------------------------
+/// Gives additional information about an USB endpoint used to transmit audio
+/// data to or from the host.
+//------------------------------------------------------------------------------
+typedef struct {
+
+    /// Size of descriptor in bytes.
+    unsigned char bLength;
+    /// Descriptor type (AUDGenericDescriptor_ENDPOINT).
+    unsigned char bDescriptorType;
+    ///  Descriptor subtype  (AUDDataEndpointDescriptor_SUBTYPE).
+    unsigned char bDescriptorSubType;
+    /// Indicates available controls and requirement on packet sizes.
+    unsigned char bmAttributes;
+    /// Indicates the units of the wLockDelay fields.
+    /// \sa "USB Audio Lock delay units"
+    unsigned char bLockDelayUnits;
+    /// Time it takes for the endpoint to lock its internal clock circuitry.
+    unsigned short wLockDelay;
+
+} __attribute__ ((packed)) AUDDataEndpointDescriptor; // GCC
+
+#ifdef __ICCARM__          // IAR
+#pragma pack()             // IAR
+#endif                     // IAR
+
+#endif //#ifndef AUDDATAENDPOINTDESCRIPTOR_H
diff --git a/usb/common/audio/AUDDeviceDescriptor.h b/usb/common/audio/AUDDeviceDescriptor.h
new file mode 100644
index 0000000..f33523a
--- /dev/null
+++ b/usb/common/audio/AUDDeviceDescriptor.h
@@ -0,0 +1,72 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Fields values for an USB Audio %device descriptor.
+///
+/// !!!Usage
+///
+/// -# When declaring the %device descriptor of a USB %audio %device, use
+///    "USB Audio device descriptor values" defined here.
+//------------------------------------------------------------------------------
+
+#ifndef AUDDEVICEDESCRIPTOR_H
+#define AUDDEVICEDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio device descriptor values"
+///
+/// This page lists the class, subclass & protocol codes that a USB audio
+/// device should display in its device descriptor.
+/// 
+/// !Codes
+/// - AUDDeviceDescriptor_CLASS
+/// - AUDDeviceDescriptor_SUBCLASS
+/// - AUDDeviceDescriptor_PROTOCOL
+
+/// Class code for a USB audio device.
+#define AUDDeviceDescriptor_CLASS                       0x00
+
+/// Subclass code for a USB audio device.
+#define AUDDeviceDescriptor_SUBCLASS                    0x00
+
+/// Protocol code for a USB audio device.
+#define AUDDeviceDescriptor_PROTOCOL                    0x00
+//------------------------------------------------------------------------------
+
+#endif //#ifndef AUDDEVICEDESCRIPTOR_H
+
diff --git a/usb/common/audio/AUDEndpointDescriptor.h b/usb/common/audio/AUDEndpointDescriptor.h
new file mode 100644
index 0000000..9dce6ab
--- /dev/null
+++ b/usb/common/audio/AUDEndpointDescriptor.h
@@ -0,0 +1,86 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Re-definition of the standard USB endpoint descriptor with two additional
+/// fields. This is required by the USB audio 1.00 specification.
+///
+/// !!!Usage
+///
+/// -# Declare an AUDEndpointDescriptor instance as part of the configuration
+///    descriptors of an USB %audio %device.
+//------------------------------------------------------------------------------
+
+#ifndef AUDENDPOINTDESCRIPTOR_H
+#define AUDENDPOINTDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Types
+//------------------------------------------------------------------------------
+
+#ifdef __ICCARM__          // IAR
+#pragma pack(1)            // IAR
+#define __attribute__(...) // IAR
+#endif                     // IAR
+
+//------------------------------------------------------------------------------
+/// Modified endpoint descriptor with two additional fields, with are
+/// USB audio specific.
+//------------------------------------------------------------------------------
+typedef struct {
+
+   /// Size of the descriptor in bytes.
+   unsigned char bLength;
+   /// Descriptor type (USBGenericDescriptor_ENDPOINT).
+   unsigned char bDescriptorType;
+   /// Address and direction of the endpoint.
+   unsigned char bEndpointAddress;
+   /// Endpoint type and additional characteristics (for isochronous endpoints).
+   unsigned char bmAttributes;
+   /// Maximum packet size (in bytes) of the endpoint.
+   unsigned short wMaxPacketSize;
+   /// Polling rate of the endpoint.
+   unsigned char bInterval;
+   /// Refresh rate for a feedback endpoint.
+   unsigned char bRefresh;
+   /// Address of the associated feedback endpoint if any.
+   unsigned char bSyncAddress;
+                                   
+} __attribute__ ((packed)) AUDEndpointDescriptor; // GCC
+
+#ifdef __ICCARM__          // IAR
+#pragma pack()             // IAR
+#endif                     // IAR
+
+#endif //#ifndef AUDENDPOINTDESCRIPTOR_H
+
diff --git a/usb/common/audio/AUDFeatureUnitDescriptor.h b/usb/common/audio/AUDFeatureUnitDescriptor.h
new file mode 100644
index 0000000..a1ba45f
--- /dev/null
+++ b/usb/common/audio/AUDFeatureUnitDescriptor.h
@@ -0,0 +1,116 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Class for manipulating USB %audio feature unit descriptor.
+///
+/// !!!Usage
+///
+/// -# Declare an AUDFeatureUnitDescriptor instance as part of the
+///    configuration descriptors returned by a USB %audio %device.
+//------------------------------------------------------------------------------
+
+#ifndef AUDFEATUREUNITDESCRIPTOR_H
+#define AUDFEATUREUNITDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio Channel controls"
+///
+/// This page lists the available controls for each channel of the audio
+/// interface. Each channel can have any control combination; simply perform
+/// a bitwise OR ('|') to combine several values.
+/// 
+/// !Controls
+/// -# AUDFeatureUnitDescriptor_MUTE
+/// -# AUDFeatureUnitDescriptor_VOLUME
+/// -# AUDFeatureUnitDescriptor_BASS
+/// -# AUDFeatureUnitDescriptor_MID
+/// -# AUDFeatureUnitDescriptor_TREBLE
+
+/// Channel mute control.
+#define AUDFeatureUnitDescriptor_MUTE               (1 << 0)
+
+/// Channel volume control.
+#define AUDFeatureUnitDescriptor_VOLUME             (1 << 1)
+
+/// Channel bass control.
+#define AUDFeatureUnitDescriptor_BASS               (1 << 2)
+
+/// Channel middle control.
+#define AUDFeatureUnitDescriptor_MID                (1 << 3)
+
+/// Channel treble control.
+#define AUDFeatureUnitDescriptor_TREBLE             (1 << 4)
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Types
+//------------------------------------------------------------------------------
+
+#ifdef __ICCARM__          // IAR
+#pragma pack(1)            // IAR
+#define __attribute__(...) // IAR
+#endif                     // IAR
+
+//------------------------------------------------------------------------------
+/// Describes available controls for each channel of the unit or terminal
+/// it is connected to. This type must be augmented with the relevant number
+/// of bmaControls fields and the iFeature field.
+//------------------------------------------------------------------------------
+typedef struct {
+
+    /// Size of descriptor in bytes.
+    unsigned char bLength;
+    /// Descriptor type (AUDGenericDescriptor_INTERFACE).
+    unsigned char bDescriptorType;
+    /// Descriptor subtype (AUDGenericDescriptor_FEATURE).
+    unsigned char bDescriptorSubType;
+    /// Identifier of this feature unit.
+    unsigned char bUnitID;
+    /// Identifier of the unit or terminal this feature unit is connected to.
+    unsigned char bSourceID;
+    /// Size in bytes of a channel controls field.
+    unsigned char bControlSize;
+
+} __attribute__ ((packed)) AUDFeatureUnitDescriptor; // GCC
+
+#ifdef __ICCARM__          // IAR
+#pragma pack()             // IAR
+#endif                     // IAR
+
+#endif //#ifndef AUDFEATUREUNITDESCRIPTOR_H
+
diff --git a/usb/common/audio/AUDFeatureUnitRequest.c b/usb/common/audio/AUDFeatureUnitRequest.c
new file mode 100644
index 0000000..bc6c642
--- /dev/null
+++ b/usb/common/audio/AUDFeatureUnitRequest.c
@@ -0,0 +1,60 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+//         Headers
+//------------------------------------------------------------------------------
+
+#include "AUDFeatureUnitRequest.h"
+
+//------------------------------------------------------------------------------
+//         Exported functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Returns the control selector value indicating the target of a Feature Unit
+/// request.
+/// \param request  Pointer to a USBGenericRequest instance.
+/// \sa "USB Audio Control selector values"
+//------------------------------------------------------------------------------
+unsigned char AUDFeatureUnitRequest_GetControl(const USBGenericRequest *request)
+{
+    return ((USBGenericRequest_GetValue(request) >> 8) & 0xFF);
+}
+
+//------------------------------------------------------------------------------
+/// Returns the channel number of a Feature unit which should be altered by the
+/// given request.
+/// \param request  Pointer to a USBGenericRequest instance.
+//------------------------------------------------------------------------------
+unsigned char AUDFeatureUnitRequest_GetChannel(const USBGenericRequest *request)
+{
+    return (USBGenericRequest_GetValue(request) & 0xFF);
+}
+
diff --git a/usb/common/audio/AUDFeatureUnitRequest.h b/usb/common/audio/AUDFeatureUnitRequest.h
new file mode 100644
index 0000000..289f598
--- /dev/null
+++ b/usb/common/audio/AUDFeatureUnitRequest.h
@@ -0,0 +1,81 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Definitions of constants and methods for using USB %audio requests
+/// targetted at a Feature unit.
+///
+/// !!!Usage
+///
+/// - For a USB %device:
+///     -# Use AUDFeatureUnitRequest_GetControl to determine which control
+///        shall be tweaked following a host request.
+//      -# Use AUDFeatureUnitRequest_GetChannel to identify the channel which
+//         will have its control altered.
+//------------------------------------------------------------------------------
+
+#ifndef AUDFEATUREUNITREQUEST_H
+#define AUDFEATUREUNITREQUEST_H
+
+//------------------------------------------------------------------------------
+//         Headers
+//------------------------------------------------------------------------------
+
+#include <usb/common/core/USBGenericRequest.h>
+
+//------------------------------------------------------------------------------
+//         Constants
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio Control selector values"
+///
+/// This page lists the available control selectors for a Feature Unit request.
+/// 
+/// !Controls
+/// - AUDFeatureUnitRequest_MUTE
+
+/// Mute control selector.
+#define AUDFeatureUnitRequest_MUTE              0x01
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Exported functions
+//------------------------------------------------------------------------------
+extern unsigned char AUDFeatureUnitRequest_GetControl(
+    const USBGenericRequest *request);
+extern unsigned char AUDFeatureUnitRequest_GetChannel(
+    const USBGenericRequest *request);
+
+#endif //#ifndef AUDFEATUREUNITREQUEST_H
+
diff --git a/usb/common/audio/AUDFormatTypeOneDescriptor.h b/usb/common/audio/AUDFormatTypeOneDescriptor.h
new file mode 100644
index 0000000..0aa6b63
--- /dev/null
+++ b/usb/common/audio/AUDFormatTypeOneDescriptor.h
@@ -0,0 +1,101 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Definitions for using USB %audio format type I descriptors.
+///
+/// !!!Usage
+///
+/// -# Declare an instance of AUDFormatTypeOneDescriptor as part of the
+///    configuration descriptors of an audio device.
+//------------------------------------------------------------------------------
+
+#ifndef AUDFORMATTYPEONEDESCRIPTOR_H
+#define AUDFORMATTYPEONEDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+/// Format type for a format type I descriptor.
+#define AUDFormatTypeOneDescriptor_FORMATTYPEONE        0x01
+
+/// AUDFormatTypeOneDescriptor_PCM - PCM format.
+#define AUDFormatTypeOneDescriptor_PCM                  0x0001
+
+/// Indicates the sampling frequency can have any value in the provided range.
+#define AUDFormatTypeOneDescriptor_CONTINUOUS           0
+
+//------------------------------------------------------------------------------
+//         Types
+//------------------------------------------------------------------------------
+
+#ifdef __ICCARM__          // IAR
+#pragma pack(1)            // IAR
+#define __attribute__(...) // IAR
+#endif                     // IAR
+
+//------------------------------------------------------------------------------
+/// Describes an audio data stream that is constructed on a sample-by-sample
+/// basis. This type must be augmented with either the continuous sampling
+/// frequency range (if bSamFreqType = <AUDFormatTypeOneDescriptor_CONTINUOUS>)
+/// or with an array containing the possible discrete frequencies.
+//------------------------------------------------------------------------------
+typedef struct {
+
+    /// Size of descriptor in bytes.
+    unsigned char bLength;
+    /// Descriptor type (AUDGenericDescriptor_INTERFACE).
+    unsigned char bDescriptorType;
+    /// Descriptor subtype (AUDStreamingInterfaceDescriptor_FORMATTYPE).
+    unsigned char bDescriptorSubType;
+    /// Format type (AUDFormatTypeOneDescriptor_FORMATTYPEONE).
+    unsigned char bFormatType;
+    /// Number of physical channels in the audio stream.
+    unsigned char bNrChannels;
+    /// Number of bytes occupied by one audio subframe.
+    unsigned char bSubFrameSize;
+    /// Number of bits effectively used in an audio subframe.
+    unsigned char bBitResolution;
+    /// Number of supported discrete sampling frequencies, or
+    /// AUDFormatTypeOneDescriptor_CONTINUOUS.
+    unsigned char bSamFreqType;
+
+} __attribute__ ((packed)) AUDFormatTypeOneDescriptor; // GCC
+
+#ifdef __ICCARM__          // IAR
+#pragma pack()             // IAR
+#endif                     // IAR
+
+#endif //#ifndef AUDFORMATTYPEONEDESCRIPTOR_H
+
diff --git a/usb/common/audio/AUDGenericDescriptor.h b/usb/common/audio/AUDGenericDescriptor.h
new file mode 100644
index 0000000..8758a92
--- /dev/null
+++ b/usb/common/audio/AUDGenericDescriptor.h
@@ -0,0 +1,121 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Constants for manipulating USB audio-specific descriptors.
+///
+/// !!!Usage
+///
+/// - For a USB %device:
+///     -# When declaring an Audio-specific descriptor, use the descriptor types
+///        and subtypes defined in this unit (see "USB Audio descriptor types"
+///        and "USB Audio descriptor subtypes").
+//------------------------------------------------------------------------------
+
+#ifndef AUDGENERICDESCRIPTOR_H
+#define AUDGENERICDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio descriptor types"
+///
+/// This page lists the available types for USB audio-specific descriptors.
+/// 
+/// !Types
+/// - AUDGenericDescriptor_DEVICE
+/// - AUDGenericDescriptor_CONFIGURATION
+/// - AUDGenericDescriptor_STRING
+/// - AUDGenericDescriptor_INTERFACE
+/// - AUDGenericDescriptor_ENDPOINT
+
+/// Descriptor gives detail about the whole device.
+#define AUDGenericDescriptor_DEVICE                     0x21
+
+/// Descriptor gives detail about a configuration.
+#define AUDGenericDescriptor_CONFIGURATION              0x22
+
+/// Descriptor gives detail about a string.
+#define AUDGenericDescriptor_STRING                     0x23
+
+/// Descriptor gives detail about an interface.
+#define AUDGenericDescriptor_INTERFACE                  0x24
+
+/// Descriptor gives detail about an endpoint.
+#define AUDGenericDescriptor_ENDPOINT                   0x25
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio descriptor subtypes"
+///
+/// This page lists the possible subtypes for USB audio-specific descriptors.
+/// 
+/// !Subtypes
+/// - AUDGenericDescriptor_HEADER
+/// - AUDGenericDescriptor_INPUTTERMINAL
+/// - AUDGenericDescriptor_OUTPUTTERMINAL
+/// - AUDGenericDescriptor_MIXERUNIT
+/// - AUDGenericDescriptor_SELECTORUNIT
+/// - AUDGenericDescriptor_FEATUREUNIT
+/// - AUDGenericDescriptor_PROCESSINGUNIT
+/// - AUDGenericDescriptor_EXTENSIONUNIT
+
+/// Header descriptor subtype.
+#define AUDGenericDescriptor_HEADER                     0x01
+
+/// Input terminal descriptor subtype.
+#define AUDGenericDescriptor_INPUTTERMINAL              0x02
+
+/// Output terminal descriptor subtype.
+#define AUDGenericDescriptor_OUTPUTTERMINAL             0x03
+
+/// Mixer unit descriptor subtype.
+#define AUDGenericDescriptor_MIXERUNIT                  0x04
+
+/// Selector unit descriptor subtype.
+#define AUDGenericDescriptor_SELECTORUNIT               0x05
+
+/// Feature unit descriptor subtype.
+#define AUDGenericDescriptor_FEATUREUNIT                0x06
+
+/// Processing unit descriptor subtype.
+#define AUDGenericDescriptor_PROCESSINGUNIT             0x07
+
+///Extension unit descriptor subtype.
+#define AUDGenericDescriptor_EXTENSIONUNIT              0x08
+//------------------------------------------------------------------------------
+
+#endif //#ifndef AUDGENERICDESCRIPTOR_H
+
diff --git a/usb/common/audio/AUDGenericRequest.c b/usb/common/audio/AUDGenericRequest.c
new file mode 100644
index 0000000..c9c6e87
--- /dev/null
+++ b/usb/common/audio/AUDGenericRequest.c
@@ -0,0 +1,57 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+//         Headers
+//------------------------------------------------------------------------------
+
+#include "AUDGenericRequest.h"
+
+//------------------------------------------------------------------------------
+//         Exported functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Returns the ID of the unit or terminal targetted by an USB audio request.
+/// \param request  Pointer to a USBGenericRequest instance.
+//------------------------------------------------------------------------------
+unsigned char AUDGenericRequest_GetEntity(const USBGenericRequest *request)
+{
+    return ((USBGenericRequest_GetIndex(request) >> 8) & 0xFF);
+}
+
+//------------------------------------------------------------------------------
+/// Returns the ID of the interface targetted by an USB audio request.
+/// \param request  Pointer to a USBGenericRequest instance.
+//------------------------------------------------------------------------------
+unsigned char AUDGenericRequest_GetInterface(const USBGenericRequest *request)
+{
+    return (USBGenericRequest_GetIndex(request) & 0xFF);
+}
+
diff --git a/usb/common/audio/AUDGenericRequest.h b/usb/common/audio/AUDGenericRequest.h
new file mode 100644
index 0000000..b0b8527
--- /dev/null
+++ b/usb/common/audio/AUDGenericRequest.h
@@ -0,0 +1,94 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Constants for using USB %audio SETUP requests.
+///
+/// !!!Usage
+///
+/// - For a USB %device:
+///     -# After receiving an Audio request from the host, use
+///        AUDGenericRequest_GetEntity to determine the target Unit or Terminal.
+///     -# After receiving an Audio request from the host, use
+///        AUDGenericRequest_GetInterface to know which interface is referenced.
+//------------------------------------------------------------------------------
+
+#ifndef AUDGENERICREQUEST_H
+#define AUDGENERICREQUEST_H
+
+//------------------------------------------------------------------------------
+//         Headers
+//------------------------------------------------------------------------------
+
+#include <usb/common/core/USBGenericRequest.h>
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio request codes"
+///
+/// This page lists the codes of the existing Audio requests.
+/// 
+/// !Requests
+/// - AUDGenericRequest_SETCUR
+/// - AUDGenericRequest_GETCUR
+
+/// SET_CUR request code.
+#define AUDGenericRequest_SETCUR                0x01
+
+/// GET_CUR request code.
+#define AUDGenericRequest_GETCUR                0x81
+
+/// GET_MIN request code.
+#define AUDGenericRequest_GETMIN                0x82
+
+/// GET_MAX request code.
+#define AUDGenericRequest_GETMAX                0x83
+
+/// GET_RES request code.
+#define AUDGenericRequest_GETRES                0x84
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Exported functions
+//------------------------------------------------------------------------------
+
+extern unsigned char AUDGenericRequest_GetEntity(
+    const USBGenericRequest *request);
+extern unsigned char AUDGenericRequest_GetInterface(
+    const USBGenericRequest *request);
+
+#endif //#ifndef AUDGENERICREQUEST_H
+
diff --git a/usb/common/audio/AUDHeaderDescriptor.h b/usb/common/audio/AUDHeaderDescriptor.h
new file mode 100644
index 0000000..ca30a0b
--- /dev/null
+++ b/usb/common/audio/AUDHeaderDescriptor.h
@@ -0,0 +1,100 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Class for manipulating USB %audio header descriptors.
+///
+/// !!!Usage
+///
+/// - For a USB %device:
+///     -# Declare a AUDHeaderDescriptor as part of the configuration
+///        descriptors of the %device.
+//------------------------------------------------------------------------------
+
+#ifndef AUDHEADERDESCRIPTOR_H
+#define AUDHEADERDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio class releases"
+/// This page lists the existing versions of the Audio class specification.
+///
+/// 
+/// !Versions
+/// - AUDHeaderDescriptor_AUD1_00
+
+/// Indentifies the USB audio specification release 1.00.
+#define AUDHeaderDescriptor_AUD1_00                 0x0100
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Types
+//------------------------------------------------------------------------------
+
+#ifdef __ICCARM__          // IAR
+#pragma pack(1)            // IAR
+#define __attribute__(...) // IAR
+#endif                     // IAR
+
+//------------------------------------------------------------------------------
+/// Groups the various audio interfaces to display one single function to
+/// the USB host. Subclass this structure to add a particular number of
+/// slave interface descriptors.
+//------------------------------------------------------------------------------
+typedef struct {
+
+    /// Size of descriptor in bytes.
+    unsigned char bLength;
+    /// Descriptor type (AUDGenericDescriptor_INTERFACE).
+    unsigned char bDescriptorType;
+    /// Descriptor subtype (AUDGenericDescriptor_HEADER).
+    unsigned char bDescriptorSubType;
+    /// Audio class release number in BCD format
+    /// \sa "USB Audio class releases"
+    unsigned short bcdADC;
+    /// Length of all descriptors used to qualify the Audio Control interface.
+    unsigned short wTotalLength;
+    /// Number of Streaming interfaces contained in this collection.
+    unsigned char bInCollection;
+
+} __attribute__ ((packed)) AUDHeaderDescriptor; // GCC
+
+#ifdef __ICCARM__          // IAR
+#pragma pack()             // IAR
+#endif                     // IAR
+
+#endif //#ifndef AUDHEADERDESCRIPTOR_H
+
diff --git a/usb/common/audio/AUDInputTerminalDescriptor.h b/usb/common/audio/AUDInputTerminalDescriptor.h
new file mode 100644
index 0000000..e0895fb
--- /dev/null
+++ b/usb/common/audio/AUDInputTerminalDescriptor.h
@@ -0,0 +1,139 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Class for manipulating input terminal descriptors.
+///
+/// !!!Usage
+///
+/// - For a USB %device:
+///     -# Declare an AUDInputTerminalDescriptor instance as part of the
+///        configuration of the %device.
+//------------------------------------------------------------------------------
+
+#ifndef AUDINPUTTERMINALDESCRIPTOR_H
+#define AUDINPUTTERMINALDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio Input terminal types"
+///
+/// This page lists the available types for an Input terminal.
+/// 
+/// !Types
+/// 
+/// - AUDInputTerminalDescriptor_USBSTREAMING
+/// - AUDInputTerminalDescriptor_MICROPHONE
+/// - AUDInputTerminalDescriptor_SPEAKERPHONE
+/// - AUDInputTerminalDescriptor_LINEIN
+
+/// A terminal receiving its data from a USB isochronous endpoint.
+#define AUDInputTerminalDescriptor_USBSTREAMING         0x0101
+/// A terminal sampling data from a microphone.
+#define AUDInputTerminalDescriptor_MICROPHONE           0x0201
+/// A terminal sampling data from a Handset In.
+#define AUDInputTerminalDescriptor_HANDSETIN            0x0401
+/// A terminal sampling data from a speakerphone
+#define AUDInputTerminalDescriptor_SPEAKERPHONE         0x0403
+/// A terminal sampling data from a Phone Line In.
+#define AUDInputTerminalDescriptor_LINEIN               0x0501
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio Channel spatial locations"
+///
+/// This page lists the possible spatial locations for audio channels.
+/// 
+/// !Locations
+/// 
+/// - AUDInputTerminalDescriptor_LEFTFRONT
+/// - AUDInputTerminalDescriptor_RIGHTFRONT
+/// - AUDInputTerminalDescriptor_CENTERFRONT
+
+/// Front left channel.
+#define AUDInputTerminalDescriptor_LEFTFRONT            (1 << 0)
+
+/// Front right channel.
+#define AUDInputTerminalDescriptor_RIGHTFRONT           (1 << 1)
+
+/// Front center channel.
+#define AUDInputTerminalDescriptor_CENTERFRONT          (1 << 2)
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Types
+//------------------------------------------------------------------------------
+
+#ifdef __ICCARM__          // IAR
+#pragma pack(1)            // IAR
+#define __attribute__(...) // IAR
+#endif                     // IAR
+
+//------------------------------------------------------------------------------
+/// Describes an input of a USB audio device.
+//------------------------------------------------------------------------------
+typedef struct {
+
+    /// Size of descriptor in bytes.
+    unsigned char bLength;
+    /// Descriptor type (AUDGenericDescriptor_INTERFACE).
+    unsigned char bDescriptorType;
+    /// Descriptor subtype (AUDGenericDescriptor_INPUTTERMINAL).
+    unsigned char bDescriptorSubType;
+    /// ID of the terminal in the audio function.
+    unsigned char bTerminalID;
+    /// Terminal type.
+    /// \sa "USB Audio Input terminal types"
+    unsigned short wTerminalType;
+    /// ID of the output terminal to which this input terminal is associated.
+    unsigned char bAssocTerminal;
+    /// Number of logical output channels in this terminal.
+    unsigned char bNrChannels;
+    /// Spatial configuration of the logical channels.
+    unsigned short wChannelConfig;
+    /// Index of a string descriptor for the first logical channel.
+    unsigned char iChannelNames;
+    /// Index of a string descriptor for this terminal.
+    unsigned char iTerminal;
+
+} __attribute__ ((packed)) AUDInputTerminalDescriptor; // GCC
+
+#ifdef __ICCARM__          // IAR
+#pragma pack()             // IAR
+#endif                     // IAR
+
+#endif //#ifndef AUDINPUTTERMINALDESCRIPTOR_H
+
diff --git a/usb/common/audio/AUDOutputTerminalDescriptor.h b/usb/common/audio/AUDOutputTerminalDescriptor.h
new file mode 100644
index 0000000..6ba3156
--- /dev/null
+++ b/usb/common/audio/AUDOutputTerminalDescriptor.h
@@ -0,0 +1,112 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Definition of a class for using USB %audio output terminal descriptors.
+///
+/// !!!Usage
+///
+/// - For a USB %device:
+///     -# Declare a AUDOutputTerminalDescriptor instance as part of the
+///        configuration descriptors of a USB %audio %device.
+//------------------------------------------------------------------------------
+
+#ifndef AUDOUTPUTTERMINALDESCRIPTOR_H
+#define AUDOUTPUTTERMINALDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio Output terminal types"
+///
+/// This page lists the available types for an output terminal.
+/// 
+/// !Types
+/// - AUDOutputTerminalDescriptor_USBTREAMING
+/// - AUDOutputTerminalDescriptor_SPEAKER
+/// - AUDOutputTerminalDescriptor_HANDSETOUT
+/// - AUDOutputTerminalDescriptor_LINEOUT
+
+/// A terminal sending data through USB isochronous endpoint.
+#define AUDOutputTerminalDescriptor_USBTREAMING         0x0101
+/// A terminal sending data to a USB host through an Isochronous endpoint.
+#define AUDOutputTerminalDescriptor_SPEAKER             0x0301
+/// A terminal sending data to Handset Out.
+#define AUDOutputTerminalDescriptor_HANDSETOUT          0x0401
+/// A terminal sending data to Phone Line Out.
+#define AUDOutputTerminalDescriptor_LINEOUT             0x0501
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Types
+//------------------------------------------------------------------------------
+
+#ifdef __ICCARM__          // IAR
+#pragma pack(1)            // IAR
+#define __attribute__(...) // IAR
+#endif                     // IAR
+
+//------------------------------------------------------------------------------
+/// \typedef AUDOutputTerminalDescriptor
+/// Describes an output of the USB audio function.
+//------------------------------------------------------------------------------
+typedef struct {
+
+    /// Size of descriptor in bytes.
+    unsigned char bLength;
+    /// Descriptor type (AUDGenericDescriptor_INTERFACE).
+    unsigned char bDescriptorType;
+    /// Descriptor subtype (AUDGenericDescriptor_OUTPUTTERMINAL).
+    unsigned char bDescriptorSubType;
+    /// Identifier for this terminal.
+    unsigned char bTerminalID;
+    /// Terminal type.
+    /// \sa "USB Audio Output terminal types"
+    unsigned short wTerminalType;
+    /// Identifier of the associated input terminal.
+    unsigned char bAssocTerminal;
+    /// Identifier of the unit or terminal to which this terminal is connected.
+    unsigned char bSourceID;
+    /// Index of a string descriptor for this terminal.
+    unsigned char iTerminal;
+
+} __attribute__ ((packed)) AUDOutputTerminalDescriptor; // GCC
+
+#ifdef __ICCARM__          // IAR
+#pragma pack()             // IAR
+#endif                     // IAR
+
+#endif //#ifndef AUDOUTPUTTERMINALDESCRIPTOR_H
+
diff --git a/usb/common/audio/AUDStreamingInterfaceDescriptor.h b/usb/common/audio/AUDStreamingInterfaceDescriptor.h
new file mode 100644
index 0000000..80c9cfd
--- /dev/null
+++ b/usb/common/audio/AUDStreamingInterfaceDescriptor.h
@@ -0,0 +1,129 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Definition of a class for manipulating USB %audio streaming interface
+/// descriptors.
+///
+/// !!!Usage
+///
+/// - For a USB %device:
+///     -# Declare an AUDStreamingInterfaceDescriptor instance as part of the
+///        configuration descriptors returned by a USB %audio %device.
+//------------------------------------------------------------------------------
+
+#ifndef AUDSTREAMINGINTERFACEDESCRIPTOR_H
+#define AUDSTREAMINGINTERFACEDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio streaming interface codes"
+///
+/// This page lists the class, subclass and protocol codes that an Audio
+/// Streaming interface should display in its descriptor.
+/// 
+/// !Codes
+/// - AUDStreamingInterfaceDescriptor_CLASS
+/// - AUDStreamingInterfaceDescriptor_SUBCLASS
+/// - AUDStreamingInterfaceDescriptor_PROTOCOL
+
+/// Class code for an USB audio streaming interface.
+#define AUDStreamingInterfaceDescriptor_CLASS               0x01
+
+/// Subclass code for an audio streaming interface.
+#define AUDStreamingInterfaceDescriptor_SUBCLASS            0x02
+
+/// Protocol code for an audio streaming interface.
+#define AUDStreamingInterfaceDescriptor_PROTOCOL            0x00
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio streaming descriptor subtypes"
+///
+/// This page lists the possible subtypes for audio-specific descriptor appended
+/// to an Audio Streaming interface.
+/// 
+/// !Subtypes
+/// - AUDStreamingInterfaceDescriptor_GENERAL
+/// - AUDStreamingInterfaceDescriptor_FORMATTYPE
+/// - AUDStreamingInterfaceDescriptor_FORMATSPECIFIC
+
+/// General descriptor subtype.
+#define AUDStreamingInterfaceDescriptor_GENERAL             0x01
+
+/// Format type descriptor subtype.
+#define AUDStreamingInterfaceDescriptor_FORMATTYPE          0x02
+
+/// Format specific descriptor subtype.
+#define AUDStreamingInterfaceDescriptor_FORMATSPECIFIC      0x03
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Types
+//------------------------------------------------------------------------------
+
+#ifdef __ICCARM__          // IAR
+#pragma pack(1)            // IAR
+#define __attribute__(...) // IAR
+#endif                     // IAR
+
+//------------------------------------------------------------------------------
+/// Provides additional information about an audio streaming interface to
+/// the USB host.
+//------------------------------------------------------------------------------
+typedef struct {
+
+    /// Size of descriptor in bytes.
+    unsigned char bLength;
+    /// Descriptor type (AUDGenericDescriptor_INTERFACE).
+    unsigned char bDescriptorType;
+    /// Descriptor subtype (AUDStreamingInterfaceDescriptor_GENERAL).
+    unsigned char bDescriptorSubType;
+    /// Terminal ID to which the interface is connected.
+    unsigned char bTerminalLink;
+    /// Delay introduced by the data path, in number of frames.
+    unsigned char bDelay;
+    /// Audio data format used by this interface.
+    unsigned short wFormatTag;
+
+} __attribute__ ((packed)) AUDStreamingInterfaceDescriptor; // GCC
+
+#ifdef __ICCARM__          // IAR
+#pragma pack()             // IAR
+#endif                     // IAR
+
+#endif //#ifndef AUDSTREAMINGINTERFACEDESCRIPTOR_H
+
diff --git a/usb/common/audio/audio.dir b/usb/common/audio/audio.dir
new file mode 100644
index 0000000..2bc574f
--- /dev/null
+++ b/usb/common/audio/audio.dir
@@ -0,0 +1,40 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \dir
+/// !!!Purpose
+///
+/// This directory contains definitions, structures and funcions related to the
+/// USB Audio Class specification. They can be divided into two groups:
+/// - Audio-specific descriptors, prefixed with AUD and suffixed with
+///   Descriptor.
+/// - Audio-specific requests, prefixed with AUD and suffixed with Request.
+//------------------------------------------------------------------------------
+