protocol/lufa/LUFA-git/LUFA/Drivers/USB/Class/Common/AudioClassCommon.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2014.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2014  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaims all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *  \brief Common definitions and declarations for the library USB Audio 1.0 Class driver.
  33  *
  34  *  Common definitions and declarations for the library USB Audio 1.0 Class driver.
  35  *
  36  *  \note This file should not be included directly. It is automatically included as needed by the USB module driver
  37  *        dispatch header located in LUFA/Drivers/USB.h.
  38  */
  39
  40 /** \ingroup Group_USBClassAudio
  41  *  \defgroup Group_USBClassAudioCommon  Common Class Definitions
  42  *
  43  *  \section Sec_USBClassAudioCommon_ModDescription Module Description
  44  *  Constants, Types and Enum definitions that are common to both Device and Host modes for the USB
  45  *  Audio 1.0 Class.
  46  *
  47  *  @{
  48  */
  49
  50 #ifndef _AUDIO_CLASS_COMMON_H_
  51 #define _AUDIO_CLASS_COMMON_H_
  52
  53         /* Includes: */
  54                 #include "../../Core/StdDescriptors.h"
  55
  56         /* Enable C linkage for C++ Compilers: */
  57                 #if defined(__cplusplus)
  58                         extern "C" {
  59                 #endif
  60
  61         /* Preprocessor Checks: */
  62                 #if !defined(__INCLUDE_FROM_AUDIO_DRIVER)
  63                         #error Do not include this file directly. Include LUFA/Drivers/USB.h instead.
  64                 #endif
  65
  66         /* Macros: */
  67                 /** \name Audio Channel Masks */
  68                 //@{
  69                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
  70                 #define AUDIO_CHANNEL_LEFT_FRONT           (1 << 0)
  71
  72                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
  73                 #define AUDIO_CHANNEL_RIGHT_FRONT          (1 << 1)
  74
  75                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
  76                 #define AUDIO_CHANNEL_CENTER_FRONT         (1 << 2)
  77
  78                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
  79                 #define AUDIO_CHANNEL_LOW_FREQ_ENHANCE     (1 << 3)
  80
  81                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
  82                 #define AUDIO_CHANNEL_LEFT_SURROUND        (1 << 4)
  83
  84                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
  85                 #define AUDIO_CHANNEL_RIGHT_SURROUND       (1 << 5)
  86
  87                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
  88                 #define AUDIO_CHANNEL_LEFT_OF_CENTER       (1 << 6)
  89
  90                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
  91                 #define AUDIO_CHANNEL_RIGHT_OF_CENTER      (1 << 7)
  92
  93                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
  94                 #define AUDIO_CHANNEL_SURROUND             (1 << 8)
  95
  96                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
  97                 #define AUDIO_CHANNEL_SIDE_LEFT            (1 << 9)
  98
  99                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
 100                 #define AUDIO_CHANNEL_SIDE_RIGHT           (1 << 10)
 101
 102                 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
 103                 #define AUDIO_CHANNEL_TOP                  (1 << 11)
 104                 //@}
 105
 106                 /** \name Audio Feature Masks */
 107                 //@{
 108                 /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
 109                 #define AUDIO_FEATURE_MUTE                 (1 << 0)
 110
 111                 /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
 112                 #define AUDIO_FEATURE_VOLUME               (1 << 1)
 113
 114                 /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
 115                 #define AUDIO_FEATURE_BASS                 (1 << 2)
 116
 117                 /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
 118                 #define AUDIO_FEATURE_MID                  (1 << 3)
 119
 120                 /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
 121                 #define AUDIO_FEATURE_TREBLE               (1 << 4)
 122
 123                 /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
 124                 #define AUDIO_FEATURE_GRAPHIC_EQUALIZER    (1 << 5)
 125
 126                 /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
 127                 #define AUDIO_FEATURE_AUTOMATIC_GAIN       (1 << 6)
 128
 129                 /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
 130                 #define AUDIO_FEATURE_DELAY                (1 << 7)
 131
 132                 /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
 133                 #define AUDIO_FEATURE_BASS_BOOST           (1 << 8)
 134
 135                 /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
 136                 #define AUDIO_FEATURE_BASS_LOUDNESS        (1 << 9)
 137                 //@}
 138
 139                 /** \name Audio Terminal Types */
 140                 //@{
 141                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 142                 #define AUDIO_TERMINAL_UNDEFINED           0x0100
 143
 144                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 145                 #define AUDIO_TERMINAL_STREAMING           0x0101
 146
 147                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 148                 #define AUDIO_TERMINAL_VENDOR              0x01FF
 149
 150                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 151                 #define AUDIO_TERMINAL_IN_UNDEFINED        0x0200
 152
 153                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 154                 #define AUDIO_TERMINAL_IN_MIC              0x0201
 155
 156                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 157                 #define AUDIO_TERMINAL_IN_DESKTOP_MIC      0x0202
 158
 159                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 160                 #define AUDIO_TERMINAL_IN_PERSONAL_MIC     0x0203
 161
 162                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 163                 #define AUDIO_TERMINAL_IN_OMNIDIR_MIC      0x0204
 164
 165                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 166                 #define AUDIO_TERMINAL_IN_MIC_ARRAY        0x0205
 167
 168                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 169                 #define AUDIO_TERMINAL_IN_PROCESSING_MIC   0x0206
 170
 171                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 172                 #define AUDIO_TERMINAL_IN_OUT_UNDEFINED    0x0300
 173
 174                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 175                 #define AUDIO_TERMINAL_OUT_SPEAKER         0x0301
 176
 177                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 178                 #define AUDIO_TERMINAL_OUT_HEADPHONES      0x0302
 179
 180                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 181                 #define AUDIO_TERMINAL_OUT_HEAD_MOUNTED    0x0303
 182
 183                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 184                 #define AUDIO_TERMINAL_OUT_DESKTOP         0x0304
 185
 186                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 187                 #define AUDIO_TERMINAL_OUT_ROOM            0x0305
 188
 189                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 190                 #define AUDIO_TERMINAL_OUT_COMMUNICATION   0x0306
 191
 192                 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
 193                 #define AUDIO_TERMINAL_OUT_LOWFREQ         0x0307
 194                 //@}
 195
 196                 /** Convenience macro to fill a 24-bit \ref USB_Audio_SampleFreq_t structure with the given sample rate as a 24-bit number.
 197                  *
 198                  *  \param[in] freq  Required audio sampling frequency in HZ
 199                  */
 200                 #define AUDIO_SAMPLE_FREQ(freq)           {.Byte1 = ((uint32_t)freq & 0xFF), .Byte2 = (((uint32_t)freq >> 8) & 0xFF), .Byte3 = (((uint32_t)freq >> 16) & 0xFF)}
 201
 202                 /** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint
 203                  *  accepts only filled endpoint packets of audio samples.
 204                  */
 205                 #define AUDIO_EP_FULL_PACKETS_ONLY        (1 << 7)
 206
 207                 /** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint
 208                  *  will accept partially filled endpoint packets of audio samples.
 209                  */
 210                 #define AUDIO_EP_ACCEPTS_SMALL_PACKETS    (0 << 7)
 211
 212                 /** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint
 213                  *  allows for sampling frequency adjustments to be made via control requests directed at the endpoint.
 214                  */
 215                 #define AUDIO_EP_SAMPLE_FREQ_CONTROL      (1 << 0)
 216
 217                 /** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint
 218                  *  allows for pitch adjustments to be made via control requests directed at the endpoint.
 219                  */
 220                 #define AUDIO_EP_PITCH_CONTROL            (1 << 1)
 221
 222         /* Enums: */
 223                 /** Enum for possible Class, Subclass and Protocol values of device and interface descriptors relating to the Audio
 224                  *  device class.
 225                  */
 226                 enum Audio_Descriptor_ClassSubclassProtocol_t
 227                 {
 228                         AUDIO_CSCP_AudioClass                     = 0x01, /**< Descriptor Class value indicating that the device or
 229                                                                            *   interface belongs to the USB Audio 1.0 class.
 230                                                                            */
 231                         AUDIO_CSCP_ControlSubclass                = 0x01, /**< Descriptor Subclass value indicating that the device or
 232                                                                            *   interface belongs to the Audio Control subclass.
 233                                                                            */
 234                         AUDIO_CSCP_ControlProtocol                = 0x00, /**< Descriptor Protocol value indicating that the device or
 235                                                                            *   interface belongs to the Audio Control protocol.
 236                                                                            */
 237                         AUDIO_CSCP_AudioStreamingSubclass         = 0x02, /**< Descriptor Subclass value indicating that the device or
 238                                                                            *   interface belongs to the MIDI Streaming subclass.
 239                                                                            */
 240                         AUDIO_CSCP_MIDIStreamingSubclass          = 0x03, /**< Descriptor Subclass value indicating that the device or
 241                                                                            *   interface belongs to the Audio streaming subclass.
 242                                                                            */
 243                         AUDIO_CSCP_StreamingProtocol              = 0x00, /**< Descriptor Protocol value indicating that the device or
 244                                                                            *   interface belongs to the Streaming Audio protocol.
 245                                                                            */
 246                 };
 247
 248                 /** Audio class specific interface description subtypes, for the Audio Control interface. */
 249                 enum Audio_CSInterface_AC_SubTypes_t
 250                 {
 251                         AUDIO_DSUBTYPE_CSInterface_Header         = 0x01, /**< Audio class specific control interface header. */
 252                         AUDIO_DSUBTYPE_CSInterface_InputTerminal  = 0x02, /**< Audio class specific control interface Input Terminal. */
 253                         AUDIO_DSUBTYPE_CSInterface_OutputTerminal = 0x03, /**< Audio class specific control interface Output Terminal. */
 254                         AUDIO_DSUBTYPE_CSInterface_Mixer          = 0x04, /**< Audio class specific control interface Mixer Unit. */
 255                         AUDIO_DSUBTYPE_CSInterface_Selector       = 0x05, /**< Audio class specific control interface Selector Unit. */
 256                         AUDIO_DSUBTYPE_CSInterface_Feature        = 0x06, /**< Audio class specific control interface Feature Unit. */
 257                         AUDIO_DSUBTYPE_CSInterface_Processing     = 0x07, /**< Audio class specific control interface Processing Unit. */
 258                         AUDIO_DSUBTYPE_CSInterface_Extension      = 0x08, /**< Audio class specific control interface Extension Unit. */
 259                 };
 260
 261                 /** Audio class specific interface description subtypes, for the Audio Streaming interface. */
 262                 enum Audio_CSInterface_AS_SubTypes_t
 263                 {
 264                         AUDIO_DSUBTYPE_CSInterface_General        = 0x01, /**< Audio class specific streaming interface general descriptor. */
 265                         AUDIO_DSUBTYPE_CSInterface_FormatType     = 0x02, /**< Audio class specific streaming interface format type descriptor. */
 266                         AUDIO_DSUBTYPE_CSInterface_FormatSpecific = 0x03, /**< Audio class specific streaming interface format information descriptor. */
 267                 };
 268
 269                 /** Audio class specific endpoint description subtypes, for the Audio Streaming interface. */
 270                 enum Audio_CSEndpoint_SubTypes_t
 271                 {
 272                         AUDIO_DSUBTYPE_CSEndpoint_General         = 0x01, /**< Audio class specific endpoint general descriptor. */
 273                 };
 274
 275                 /** Enum for the Audio class specific control requests that can be issued by the USB bus host. */
 276                 enum Audio_ClassRequests_t
 277                 {
 278                         AUDIO_REQ_SetCurrent    = 0x01, /**< Audio class-specific request to set the current value of a parameter within the device. */
 279                         AUDIO_REQ_SetMinimum    = 0x02, /**< Audio class-specific request to set the minimum value of a parameter within the device. */
 280                         AUDIO_REQ_SetMaximum    = 0x03, /**< Audio class-specific request to set the maximum value of a parameter within the device. */
 281                         AUDIO_REQ_SetResolution = 0x04, /**< Audio class-specific request to set the resolution value of a parameter within the device. */
 282                         AUDIO_REQ_SetMemory     = 0x05, /**< Audio class-specific request to set the memory value of a parameter within the device. */
 283                         AUDIO_REQ_GetCurrent    = 0x81, /**< Audio class-specific request to get the current value of a parameter within the device. */
 284                         AUDIO_REQ_GetMinimum    = 0x82, /**< Audio class-specific request to get the minimum value of a parameter within the device. */
 285                         AUDIO_REQ_GetMaximum    = 0x83, /**< Audio class-specific request to get the maximum value of a parameter within the device. */
 286                         AUDIO_REQ_GetResolution = 0x84, /**< Audio class-specific request to get the resolution value of a parameter within the device. */
 287                         AUDIO_REQ_GetMemory     = 0x85, /**< Audio class-specific request to get the memory value of a parameter within the device. */
 288                         AUDIO_REQ_GetStatus     = 0xFF, /**< Audio class-specific request to get the device status. */
 289                 };
 290
 291                 /** Enum for Audio class specific Endpoint control modifiers which can be set and retrieved by a USB host, if the corresponding
 292                  *  endpoint control is indicated to be supported in the Endpoint's Audio-class specific endpoint descriptor.
 293                  */
 294                 enum Audio_EndpointControls_t
 295                 {
 296                         AUDIO_EPCONTROL_SamplingFreq = 0x01, /**< Sampling frequency adjustment of the endpoint. */
 297                         AUDIO_EPCONTROL_Pitch        = 0x02, /**< Pitch adjustment of the endpoint. */
 298                 };
 299
 300         /* Type Defines: */
 301                 /** \brief Audio class-specific Input Terminal Descriptor (LUFA naming conventions).
 302                  *
 303                  *  Type define for an Audio class-specific input terminal descriptor. This indicates to the host that the device
 304                  *  contains an input audio source, either from a physical terminal on the device, or a logical terminal (for example,
 305                  *  a USB endpoint). See the USB Audio specification for more details.
 306                  *
 307                  *  \see \ref USB_Audio_StdDescriptor_InputTerminal_t for the version of this type with standard element names.
 308                  *
 309                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 310                  */
 311                 typedef struct
 312                 {
 313                         USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
 314                         uint8_t                 Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 315                                                           *   must be \ref AUDIO_DSUBTYPE_CSInterface_InputTerminal.
 316                                                           */
 317
 318                         uint8_t                 TerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */
 319                         uint16_t                TerminalType; /**< Type of terminal, a \c TERMINAL_* mask. */
 320                         uint8_t                 AssociatedOutputTerminal; /**< ID of associated output terminal, for physically grouped terminals
 321                                                                            *   such as the speaker and microphone of a phone handset.
 322                                                                            */
 323                         uint8_t                 TotalChannels; /**< Total number of separate audio channels within this interface (right, left, etc.) */
 324                         uint16_t                ChannelConfig; /**< \c CHANNEL_* masks indicating what channel layout is supported by this terminal. */
 325
 326                         uint8_t                 ChannelStrIndex; /**< Index of a string descriptor describing this channel within the device. */
 327                         uint8_t                 TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
 328                 } ATTR_PACKED USB_Audio_Descriptor_InputTerminal_t;
 329
 330                 /** \brief Audio class-specific Input Terminal Descriptor (USB-IF naming conventions).
 331                  *
 332                  *  Type define for an Audio class-specific input terminal descriptor. This indicates to the host that the device
 333                  *  contains an input audio source, either from a physical terminal on the device, or a logical terminal (for example,
 334                  *  a USB endpoint). See the USB Audio specification for more details.
 335                  *
 336                  *  \see \ref USB_Audio_Descriptor_InputTerminal_t for the version of this type with non-standard LUFA specific
 337                  *       element names.
 338                  *
 339                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 340                  */
 341                 typedef struct
 342                 {
 343                         uint8_t  bLength; /**< Size of the descriptor, in bytes. */
 344                         uint8_t  bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
 345                                                    *   given by the specific class.
 346                                                    */
 347
 348                         uint8_t  bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 349                                                       *   must be \ref AUDIO_DSUBTYPE_CSInterface_InputTerminal.
 350                                                       */
 351                         uint8_t  bTerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */
 352                         uint16_t wTerminalType; /**< Type of terminal, a \c TERMINAL_* mask. */
 353                         uint8_t  bAssocTerminal; /**< ID of associated output terminal, for physically grouped terminals
 354                                                   *   such as the speaker and microphone of a phone handset.
 355                                                   */
 356                         uint8_t  bNrChannels; /**< Total number of separate audio channels within this interface (right, left, etc.) */
 357                         uint16_t wChannelConfig; /**< \c CHANNEL_* masks indicating what channel layout is supported by this terminal. */
 358
 359                         uint8_t  iChannelNames; /**< Index of a string descriptor describing this channel within the device. */
 360                         uint8_t  iTerminal; /**< Index of a string descriptor describing this descriptor within the device. */
 361                 } ATTR_PACKED USB_Audio_StdDescriptor_InputTerminal_t;
 362
 363                 /** \brief Audio class-specific Output Terminal Descriptor (LUFA naming conventions).
 364                  *
 365                  *  Type define for an Audio class-specific output terminal descriptor. This indicates to the host that the device
 366                  *  contains an output audio sink, either to a physical terminal on the device, or a logical terminal (for example,
 367                  *  a USB endpoint). See the USB Audio specification for more details.
 368                  *
 369                  *  \see \ref USB_Audio_StdDescriptor_OutputTerminal_t for the version of this type with standard element names.
 370                  *
 371                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 372                  */
 373                 typedef struct
 374                 {
 375                         USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
 376                         uint8_t                 Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 377                                                           *   must be \ref AUDIO_DSUBTYPE_CSInterface_OutputTerminal.
 378                                                           */
 379
 380                         uint8_t                 TerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */
 381                         uint16_t                TerminalType; /**< Type of terminal, a \c TERMINAL_* mask. */
 382                         uint8_t                 AssociatedInputTerminal; /**< ID of associated input terminal, for physically grouped terminals
 383                                                                             *   such as the speaker and microphone of a phone handset.
 384                                                                             */
 385                         uint8_t                 SourceID; /**< ID value of the unit this terminal's audio is sourced from. */
 386
 387                         uint8_t                 TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
 388                 } ATTR_PACKED USB_Audio_Descriptor_OutputTerminal_t;
 389
 390                 /** \brief Audio class-specific Output Terminal Descriptor (USB-IF naming conventions).
 391                  *
 392                  *  Type define for an Audio class-specific output terminal descriptor. This indicates to the host that the device
 393                  *  contains an output audio sink, either to a physical terminal on the device, or a logical terminal (for example,
 394                  *  a USB endpoint). See the USB Audio specification for more details.
 395                  *
 396                  *  \see \ref USB_Audio_Descriptor_OutputTerminal_t for the version of this type with non-standard LUFA specific
 397                  *       element names.
 398                  *
 399                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 400                  */
 401                 typedef struct
 402                 {
 403                         uint8_t  bLength; /**< Size of the descriptor, in bytes. */
 404                         uint8_t  bDescriptorType; /**< Sub type value used to distinguish between audio class-specific descriptors,
 405                                                    *   must be \ref AUDIO_DSUBTYPE_CSInterface_OutputTerminal.
 406                                                    */
 407
 408                         uint8_t  bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 409                                                       *   a value from the \ref Audio_CSInterface_AC_SubTypes_t enum.
 410                                                       */
 411                         uint8_t  bTerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */
 412                         uint16_t wTerminalType; /**< Type of terminal, a \c TERMINAL_* mask. */
 413                         uint8_t  bAssocTerminal; /**< ID of associated input terminal, for physically grouped terminals
 414                                                   *   such as the speaker and microphone of a phone handset.
 415                                                   */
 416                         uint8_t  bSourceID; /**< ID value of the unit this terminal's audio is sourced from. */
 417
 418                         uint8_t  iTerminal; /**< Index of a string descriptor describing this descriptor within the device. */
 419                 } ATTR_PACKED USB_Audio_StdDescriptor_OutputTerminal_t;
 420
 421                 /** \brief Audio class-specific Interface Descriptor (LUFA naming conventions).
 422                  *
 423                  *  Type define for an Audio class-specific interface descriptor. This follows a regular interface descriptor to
 424                  *  supply extra information about the audio device's layout to the host. See the USB Audio specification for more
 425                  *  details.
 426                  *
 427                  *  \see \ref USB_Audio_StdDescriptor_Interface_AC_t for the version of this type with standard element names.
 428                  *
 429                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 430                  */
 431                 typedef struct
 432                 {
 433                         USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
 434                         uint8_t                 Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 435                                                           *   a value from the \ref Audio_CSInterface_AS_SubTypes_t enum.
 436                                                           */
 437
 438                         uint16_t                ACSpecification; /**< Binary Coded Decimal value, indicating the supported Audio Class specification version.
 439                                                                   *
 440                                                                   *   \see \ref VERSION_BCD() utility macro.
 441                                                                   */
 442                         uint16_t                TotalLength; /**< Total length of the Audio class-specific descriptors, including this descriptor. */
 443
 444                         uint8_t                 InCollection; /**< Total number of Audio Streaming interfaces linked to this Audio Control interface (must be 1). */
 445                         uint8_t                 InterfaceNumber; /**< Interface number of the associated Audio Streaming interface. */
 446                 } ATTR_PACKED USB_Audio_Descriptor_Interface_AC_t;
 447
 448                 /** \brief Audio class-specific Interface Descriptor (USB-IF naming conventions).
 449                  *
 450                  *  Type define for an Audio class-specific interface descriptor. This follows a regular interface descriptor to
 451                  *  supply extra information about the audio device's layout to the host. See the USB Audio specification for more
 452                  *  details.
 453                  *
 454                  *  \see \ref USB_Audio_Descriptor_Interface_AC_t for the version of this type with non-standard LUFA specific
 455                  *       element names.
 456                  *
 457                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 458                  */
 459                 typedef struct
 460                 {
 461                         uint8_t  bLength; /**< Size of the descriptor, in bytes. */
 462                         uint8_t  bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
 463                                                    *   given by the specific class.
 464                                                    */
 465
 466                         uint8_t  bDescriptorSubtype;/**< Sub type value used to distinguish between audio class-specific descriptors,
 467                                                      *   a value from the \ref Audio_CSInterface_AS_SubTypes_t enum.
 468                                                      */
 469
 470                         uint16_t bcdADC; /**< Binary coded decimal value, indicating the supported Audio Class specification version.
 471                                           *
 472                                           *   \see \ref VERSION_BCD() utility macro.
 473                                           */
 474                         uint16_t wTotalLength; /**< Total length of the Audio class-specific descriptors, including this descriptor. */
 475
 476                         uint8_t  bInCollection; /**< Total number of Audio Streaming interfaces linked to this Audio Control interface (must be 1). */
 477                         uint8_t  bInterfaceNumbers; /**< Interface number of the associated Audio Streaming interface. */
 478                 } ATTR_PACKED USB_Audio_StdDescriptor_Interface_AC_t;
 479
 480                 /** \brief Audio class-specific Feature Unit Descriptor (LUFA naming conventions).
 481                  *
 482                  *  Type define for an Audio class-specific Feature Unit descriptor. This indicates to the host what features
 483                  *  are present in the device's audio stream for basic control, such as per-channel volume. See the USB Audio
 484                  *  specification for more details.
 485                  *
 486                  *  \see \ref USB_Audio_StdDescriptor_FeatureUnit_t for the version of this type with standard element names.
 487                  *
 488                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 489                  */
 490                 typedef struct
 491                 {
 492                         USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
 493                         uint8_t                 Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 494                                                           *   must be \ref AUDIO_DSUBTYPE_CSInterface_Feature.
 495                                                           */
 496
 497                         uint8_t                 UnitID; /**< ID value of this feature unit - must be a unique value within the device. */
 498                         uint8_t                 SourceID; /**< Source ID value of the audio source input into this feature unit. */
 499
 500                         uint8_t                 ControlSize; /**< Size of each element in the \c ChannelControls array. */
 501                         uint8_t                 ChannelControls[3]; /**< Feature masks for the control channel, and each separate audio channel. */
 502
 503                         uint8_t                 FeatureUnitStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
 504                 } ATTR_PACKED USB_Audio_Descriptor_FeatureUnit_t;
 505
 506                 /** \brief Audio class-specific Feature Unit Descriptor (USB-IF naming conventions).
 507                  *
 508                  *  Type define for an Audio class-specific Feature Unit descriptor. This indicates to the host what features
 509                  *  are present in the device's audio stream for basic control, such as per-channel volume. See the USB Audio
 510                  *  specification for more details.
 511                  *
 512                  *  \see \ref USB_Audio_Descriptor_FeatureUnit_t for the version of this type with non-standard LUFA specific
 513                  *       element names.
 514                  *
 515                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 516                  */
 517                 typedef struct
 518                 {
 519                         uint8_t bLength; /**< Size of the descriptor, in bytes. */
 520                         uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
 521                                                   *   given by the specific class.
 522                                                   */
 523
 524                         uint8_t bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 525                                                      *   must be \ref AUDIO_DSUBTYPE_CSInterface_Feature.
 526                                                      */
 527
 528                         uint8_t bUnitID; /**< ID value of this feature unit - must be a unique value within the device. */
 529                         uint8_t bSourceID; /**< Source ID value of the audio source input into this feature unit. */
 530
 531                         uint8_t bControlSize; /**< Size of each element in the \c ChannelControls array. */
 532                         uint8_t bmaControls[3]; /**< Feature masks for the control channel, and each separate audio channel. */
 533
 534                         uint8_t iFeature; /**< Index of a string descriptor describing this descriptor within the device. */
 535                 } ATTR_PACKED USB_Audio_StdDescriptor_FeatureUnit_t;
 536
 537                 /** \brief Audio class-specific Streaming Audio Interface Descriptor (LUFA naming conventions).
 538                  *
 539                  *  Type define for an Audio class-specific streaming interface descriptor. This indicates to the host
 540                  *  how audio streams within the device are formatted. See the USB Audio specification for more details.
 541                  *
 542                  *  \see \ref USB_Audio_StdDescriptor_Interface_AS_t for the version of this type with standard element names.
 543                  *
 544                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 545                  */
 546                 typedef struct
 547                 {
 548                         USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
 549                         uint8_t                 Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 550                                                           *   a value from the \ref Audio_CSInterface_AS_SubTypes_t enum.
 551                                                           */
 552
 553                         uint8_t                 TerminalLink; /**< ID value of the output terminal this descriptor is describing. */
 554
 555                         uint8_t                 FrameDelay; /**< Delay in frames resulting from the complete sample processing from input to output. */
 556                         uint16_t                AudioFormat; /**< Format of the audio stream, see Audio Device Formats specification. */
 557                 } ATTR_PACKED USB_Audio_Descriptor_Interface_AS_t;
 558
 559                 /** \brief Audio class-specific Streaming Audio Interface Descriptor (USB-IF naming conventions).
 560                  *
 561                  *  Type define for an Audio class-specific streaming interface descriptor. This indicates to the host
 562                  *  how audio streams within the device are formatted. See the USB Audio specification for more details.
 563                  *
 564                  *  \see \ref USB_Audio_Descriptor_Interface_AS_t for the version of this type with non-standard LUFA specific
 565                  *       element names.
 566                  *
 567                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 568                  */
 569                 typedef struct
 570                 {
 571                         uint8_t  bLength; /**< Size of the descriptor, in bytes. */
 572                         uint8_t  bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
 573                                                    *   given by the specific class.
 574                                                    */
 575
 576                         uint8_t  bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 577                                                       *   a value from the \ref Audio_CSInterface_AS_SubTypes_t enum.
 578                                                       */
 579
 580                         uint8_t  bTerminalLink; /**< ID value of the output terminal this descriptor is describing. */
 581
 582                         uint8_t  bDelay; /**< Delay in frames resulting from the complete sample processing from input to output. */
 583                         uint16_t wFormatTag; /**< Format of the audio stream, see Audio Device Formats specification. */
 584                 } ATTR_PACKED USB_Audio_StdDescriptor_Interface_AS_t;
 585
 586                 /** \brief Audio class-specific Format Descriptor (LUFA naming conventions).
 587                  *
 588                  *  Type define for an Audio class-specific audio format descriptor. This is used to give the host full details
 589                  *  about the number of channels, the sample resolution, acceptable sample frequencies and encoding method used
 590                  *  in the device's audio streams. See the USB Audio specification for more details.
 591                  *
 592                  *  \attention This descriptor <b>must</b> be followed by one or more \ref USB_Audio_SampleFreq_t elements containing
 593                  *             the continuous or discrete sample frequencies.
 594                  *
 595                  *  \see \ref USB_Audio_StdDescriptor_Format_t for the version of this type with standard element names.
 596                  *
 597                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 598                  */
 599                 typedef struct
 600                 {
 601                         USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
 602                         uint8_t                 Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 603                                                           *   must be \ref AUDIO_DSUBTYPE_CSInterface_FormatType.
 604                                                           */
 605
 606                         uint8_t                 FormatType; /**< Format of the audio stream, see Audio Device Formats specification. */
 607                         uint8_t                 Channels; /**< Total number of discrete channels in the stream. */
 608
 609                         uint8_t                 SubFrameSize; /**< Size in bytes of each channel's sample data in the stream. */
 610                         uint8_t                 BitResolution; /**< Bits of resolution of each channel's samples in the stream. */
 611
 612                         uint8_t                 TotalDiscreteSampleRates; /**< Total number of discrete sample frequencies supported by the device. When
 613                                                                            *   zero, this must be followed by the lower and upper continuous sampling
 614                                                                            *   frequencies supported by the device; otherwise, this must be followed
 615                                                                            *   by the given number of discrete sampling frequencies supported.
 616                                                                            */
 617                 } ATTR_PACKED USB_Audio_Descriptor_Format_t;
 618
 619                 /** \brief 24-Bit Audio Frequency Structure.
 620                  *
 621                  *  Type define for a 24-bit audio sample frequency structure. As GCC does not contain a built in 24-bit datatype,
 622                  *  this this structure is used to build up the value instead. Fill this structure with the \ref AUDIO_SAMPLE_FREQ() macro.
 623                  *
 624                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 625                  */
 626                 typedef struct
 627                 {
 628                         uint8_t Byte1; /**< Lowest 8 bits of the 24-bit value. */
 629                         uint8_t Byte2; /**< Middle 8 bits of the 24-bit value. */
 630                         uint8_t Byte3; /**< Upper 8 bits of the 24-bit value. */
 631                 } ATTR_PACKED USB_Audio_SampleFreq_t;
 632
 633                 /** \brief Audio class-specific Format Descriptor (USB-IF naming conventions).
 634                  *
 635                  *  Type define for an Audio class-specific audio format descriptor. This is used to give the host full details
 636                  *  about the number of channels, the sample resolution, acceptable sample frequencies and encoding method used
 637                  *  in the device's audio streams. See the USB Audio specification for more details.
 638                  *
 639                  *  \attention This descriptor <b>must</b> be followed by one or more 24-bit integer elements containing the continuous
 640                  *             or discrete sample frequencies.
 641                  *
 642                  *  \see \ref USB_Audio_Descriptor_Format_t for the version of this type with non-standard LUFA specific
 643                  *       element names.
 644                  *
 645                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 646                  */
 647                 typedef struct
 648                 {
 649                         uint8_t bLength; /**< Size of the descriptor, in bytes. */
 650                         uint8_t bDescriptorType; /**< Sub type value used to distinguish between audio class-specific descriptors,
 651                                                   *   must be \ref AUDIO_DSUBTYPE_CSInterface_FormatType.
 652                                                   */
 653
 654                         uint8_t bDescriptorSubtype;/**< Sub type value used to distinguish between audio class-specific descriptors,
 655                                                     *   a value from the \ref Audio_CSInterface_AS_SubTypes_t enum.
 656                                                     */
 657
 658                         uint8_t bFormatType; /**< Format of the audio stream, see Audio Device Formats specification. */
 659                         uint8_t bNrChannels; /**< Total number of discrete channels in the stream. */
 660
 661                         uint8_t bSubFrameSize; /**< Size in bytes of each channel's sample data in the stream. */
 662                         uint8_t bBitResolution; /**< Bits of resolution of each channel's samples in the stream. */
 663
 664                         uint8_t bSampleFrequencyType; /**< Total number of sample frequencies supported by the device. When
 665                                                        *   zero, this must be followed by the lower and upper continuous sampling
 666                                                        *   frequencies supported by the device; otherwise, this must be followed
 667                                                        *   by the given number of discrete sampling frequencies supported.
 668                                                        */
 669                 } ATTR_PACKED USB_Audio_StdDescriptor_Format_t;
 670
 671                 /** \brief Audio class-specific Streaming Endpoint Descriptor (LUFA naming conventions).
 672                  *
 673                  *  Type define for an Audio class-specific endpoint descriptor. This contains a regular endpoint
 674                  *  descriptor with a few Audio-class-specific extensions. See the USB Audio specification for more details.
 675                  *
 676                  *  \see \ref USB_Audio_StdDescriptor_StreamEndpoint_Std_t for the version of this type with standard element names.
 677                  *
 678                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 679                  */
 680                 typedef struct
 681                 {
 682                         USB_Descriptor_Endpoint_t Endpoint; /**< Standard endpoint descriptor describing the audio endpoint. */
 683
 684                         uint8_t                   Refresh; /**< Always set to zero for Audio class devices. */
 685                         uint8_t                   SyncEndpointNumber; /**< Endpoint address to send synchronization information to, if needed (zero otherwise). */
 686                 } ATTR_PACKED USB_Audio_Descriptor_StreamEndpoint_Std_t;
 687
 688                 /** \brief Audio class-specific Streaming Endpoint Descriptor (USB-IF naming conventions).
 689                  *
 690                  *  Type define for an Audio class-specific endpoint descriptor. This contains a regular endpoint
 691                  *  descriptor with a few Audio-class-specific extensions. See the USB Audio specification for more details.
 692                  *
 693                  *  \see \ref USB_Audio_Descriptor_StreamEndpoint_Std_t for the version of this type with non-standard LUFA specific
 694                  *       element names.
 695                  *
 696                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 697                  */
 698                 typedef struct
 699                 {
 700                         uint8_t  bLength; /**< Size of the descriptor, in bytes. */
 701                         uint8_t  bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a
 702                                                    *   value given by the specific class.
 703                                                    */
 704                         uint8_t  bEndpointAddress; /**< Logical address of the endpoint within the device for the current
 705                                                     *   configuration, including direction mask.
 706                                                     */
 707                         uint8_t  bmAttributes; /**< Endpoint attributes, comprised of a mask of the endpoint type (\c EP_TYPE_*)
 708                                                 *   and attributes (\c ENDPOINT_ATTR_*) masks.
 709                                                 */
 710                         uint16_t wMaxPacketSize; /**< Size of the endpoint bank, in bytes. This indicates the maximum packet size
 711                                                   *   that the endpoint can receive at a time.
 712                                                   */
 713                         uint8_t  bInterval; /**< Polling interval in milliseconds for the endpoint if it is an INTERRUPT or
 714                                              *   ISOCHRONOUS type.
 715                                              */
 716
 717                         uint8_t  bRefresh; /**< Always set to zero for Audio class devices. */
 718                         uint8_t  bSynchAddress; /**< Endpoint address to send synchronization information to, if needed (zero otherwise). */
 719                 } ATTR_PACKED USB_Audio_StdDescriptor_StreamEndpoint_Std_t;
 720
 721                 /** \brief Audio class-specific Extended Endpoint Descriptor (LUFA naming conventions).
 722                  *
 723                  *  Type define for an Audio class-specific extended endpoint descriptor. This contains extra information
 724                  *  on the usage of endpoints used to stream audio in and out of the USB Audio device, and follows an Audio
 725                  *  class-specific extended endpoint descriptor. See the USB Audio specification for more details.
 726                  *
 727                  *  \see \ref USB_Audio_StdDescriptor_StreamEndpoint_Spc_t for the version of this type with standard element names.
 728                  *
 729                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 730                  */
 731                 typedef struct
 732                 {
 733                         USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
 734                         uint8_t                 Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 735                                                           *   a value from the \ref Audio_CSEndpoint_SubTypes_t enum.
 736                                                           */
 737
 738                         uint8_t                 Attributes; /**< Audio class-specific endpoint attributes, such as \ref AUDIO_EP_FULL_PACKETS_ONLY. */
 739
 740                         uint8_t                 LockDelayUnits; /**< Units used for the LockDelay field, see Audio class specification. */
 741                         uint16_t                LockDelay; /**< Time required to internally lock endpoint's internal clock recovery circuitry. */
 742                 } ATTR_PACKED USB_Audio_Descriptor_StreamEndpoint_Spc_t;
 743
 744                 /** \brief Audio class-specific Extended Endpoint Descriptor (USB-IF naming conventions).
 745                  *
 746                  *  Type define for an Audio class-specific extended endpoint descriptor. This contains extra information
 747                  *  on the usage of endpoints used to stream audio in and out of the USB Audio device, and follows an Audio
 748                  *  class-specific extended endpoint descriptor. See the USB Audio specification for more details.
 749                  *
 750                  *  \see \ref USB_Audio_Descriptor_StreamEndpoint_Spc_t for the version of this type with non-standard LUFA specific
 751                  *       element names.
 752                  *
 753                  *  \note Regardless of CPU architecture, these values should be stored as little endian.
 754                  */
 755                 typedef struct
 756                 {
 757                         uint8_t  bLength; /**< Size of the descriptor, in bytes. */
 758                         uint8_t  bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
 759                                                    *   given by the specific class.
 760                                                    */
 761
 762                         uint8_t  bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors,
 763                                                       *   a value from the \ref Audio_CSEndpoint_SubTypes_t enum.
 764                                                       */
 765
 766                         uint8_t  bmAttributes; /**< Audio class-specific endpoint attributes, such as \ref AUDIO_EP_FULL_PACKETS_ONLY. */
 767
 768                         uint8_t  bLockDelayUnits; /**< Units used for the LockDelay field, see Audio class specification. */
 769                         uint16_t wLockDelay; /**< Time required to internally lock endpoint's internal clock recovery circuitry. */
 770                 } ATTR_PACKED USB_Audio_StdDescriptor_StreamEndpoint_Spc_t;
 771
 772         /* Disable C linkage for C++ Compilers: */
 773                 #if defined(__cplusplus)
 774                         }
 775                 #endif
 776
 777 #endif
 778
 779 /** @} */
 780