audinputterminaldescriptor.h

at91sam9260-ek library file

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
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 * Copyright (c) 2008, Atmel Corporation
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//------------------------------------------------------------------------------
/// \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 "Input terminal types"
/// This page lists the available types for an Input terminal.
/// 
/// !Types
/// 
/// - AUDInputTerminalDescriptor_USBSTREAMING

/// A terminal receiving its data from a USB isochronous endpoint.
#define AUDInputTerminalDescriptor_USBSTREAMING         0x0101
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
/// \page "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 (see "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