audstreaminginterfacedescriptor.h

at91sam9260-ek library file

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//------------------------------------------------------------------------------
/// \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 "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 "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