Audio.h 21.3 KB
 Dean Camera committed May 08, 2010 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 /* LUFA Library Copyright (C) Dean Camera, 2010. dean [at] fourwalledcubicle [dot] com www.fourwalledcubicle.com */ /* Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com) Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that the copyright notice and this permission notice and warranty disclaimer appear in supporting documentation, and that the name of the author not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. The author disclaim all warranties with regard to this software, including all implied warranties of merchantability and fitness. In no event shall the author be liable for any special, indirect or consequential damages or any damages whatsoever resulting from loss of use, data or profits, whether in an action of contract, negligence or other tortious action, arising out of or in connection with the use or performance of this software. */ /** \file  Dean Camera committed Aug 21, 2010 32  * \brief Common definitions and declarations for the library USB Audio 1.0 Class driver.  Dean Camera committed May 08, 2010 33  *  Dean Camera committed Aug 21, 2010 34  * Common definitions and declarations for the library USB Audio 1.0 Class driver.  Dean Camera committed May 08, 2010 35 36 37 38 39 40 41 42 43 44  * * \note This file should not be included directly. It is automatically included as needed by the class driver * dispatch header located in LUFA/Drivers/USB/Class/Audio.h. */ /** \ingroup Group_USBClassAudio * @defgroup Group_USBClassAudioCommon Common Class Definitions * * \section Module Description * Constants, Types and Enum definitions that are common to both Device and Host modes for the USB  Dean Camera committed Aug 21, 2010 45  * Audio 1.0 Class.  Dean Camera committed May 08, 2010 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81  * * @{ */ #ifndef _AUDIO_CLASS_COMMON_H_ #define _AUDIO_CLASS_COMMON_H_ /* Includes: */ #include "../../USB.h" #include /* Enable C linkage for C++ Compilers: */ #if defined(__cplusplus) extern "C" { #endif /* Preprocessor Checks: */ #if !defined(__INCLUDE_FROM_AUDIO_DRIVER) #error Do not include this file directly. Include LUFA/Drivers/Class/Audio.h instead. #endif /* Macros: */ #if !defined(AUDIO_TOTAL_SAMPLE_RATES) || defined(__DOXYGEN__) /** Total number of discrete audio sample rates supported by the device. This value can be overridden by defining this * token in the project makefile to the desired value, and passing it to the compiler via the -D switch. */ #define AUDIO_TOTAL_SAMPLE_RATES 1 #endif /** Descriptor header constant to indicate a Audio class interface descriptor. */ #define DTYPE_AudioInterface 0x24 /** Descriptor header constant to indicate a Audio class endpoint descriptor. */ #define DTYPE_AudioEndpoint 0x25  Dean Camera committed Jun 17, 2010 82  /** Audio class descriptor subtype value for a Audio class-specific header descriptor. */  Dean Camera committed May 08, 2010 83 84  #define DSUBTYPE_Header 0x01  Dean Camera committed Jun 17, 2010 85  /** Audio class descriptor subtype value for an Output Terminal Audio class-specific descriptor. */  Dean Camera committed May 08, 2010 86 87  #define DSUBTYPE_InputTerminal 0x02  Dean Camera committed Jun 17, 2010 88  /** Audio class descriptor subtype value for an Input Terminal Audio class-specific descriptor. */  Dean Camera committed May 08, 2010 89 90  #define DSUBTYPE_OutputTerminal 0x03  Dean Camera committed Jun 17, 2010 91  /** Audio class descriptor subtype value for a Feature Unit Audio class-specific descriptor. */  Dean Camera committed May 08, 2010 92 93  #define DSUBTYPE_FeatureUnit 0x06  Dean Camera committed Jun 17, 2010 94  /** Audio class descriptor subtype value for a general Audio class-specific descriptor. */  Dean Camera committed May 08, 2010 95 96  #define DSUBTYPE_General 0x01  Dean Camera committed Jun 17, 2010 97  /** Audio class descriptor subtype value for an Audio class-specific descriptor indicating the format of an audio stream. */  Dean Camera committed May 08, 2010 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227  #define DSUBTYPE_Format 0x02 /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_LEFT_FRONT (1 << 0) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_RIGHT_FRONT (1 << 1) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_CENTER_FRONT (1 << 2) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_LOW_FREQ_ENHANCE (1 << 3) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_LEFT_SURROUND (1 << 4) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_RIGHT_SURROUND (1 << 5) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_LEFT_OF_CENTER (1 << 6) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_RIGHT_OF_CENTER (1 << 7) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_SURROUND (1 << 8) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_SIDE_LEFT (1 << 9) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_SIDE_RIGHT (1 << 10) /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define CHANNEL_TOP (1 << 11) /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ #define FEATURE_MUTE (1 << 0) /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ #define FEATURE_VOLUME (1 << 1) /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ #define FEATURE_BASS (1 << 2) /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ #define FEATURE_MID (1 << 3) /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ #define FEATURE_TREBLE (1 << 4) /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ #define FEATURE_GRAPHIC_EQUALIZER (1 << 5) /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ #define FEATURE_AUTOMATIC_GAIN (1 << 6) /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ #define FEATURE_DELAY (1 << 7) /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ #define FEATURE_BASS_BOOST (1 << 8) /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ #define FEATURE_BASS_LOUDNESS (1 << 9) /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_UNDEFINED 0x0100 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_STREAMING 0x0101 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_VENDOR 0x01FF /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_IN_UNDEFINED 0x0200 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_IN_MIC 0x0201 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_IN_DESKTOP_MIC 0x0202 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_IN_PERSONAL_MIC 0x0203 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_IN_OMNIDIR_MIC 0x0204 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_IN_MIC_ARRAY 0x0205 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_IN_PROCESSING_MIC 0x0206 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_IN_OUT_UNDEFINED 0x0300 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_OUT_SPEAKER 0x0301 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_OUT_HEADPHONES 0x0302 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_OUT_HEAD_MOUNTED 0x0303 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_OUT_DESKTOP 0x0304 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_OUT_ROOM 0x0305 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_OUT_COMMUNICATION 0x0306 /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ #define TERMINAL_OUT_LOWFREQ 0x0307 /** Convenience macro, to fill a 24-bit AudioSampleFreq_t structure with the given sample rate as a 24-bit number. * * \param[in] freq Required audio sampling frequency in HZ */ #define AUDIO_SAMPLE_FREQ(freq) {LowWord: ((uint32_t)freq & 0x00FFFF), HighByte: (((uint32_t)freq >> 16) & 0x0000FF)}  Dean Camera committed Jun 17, 2010 228  /** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint  Dean Camera committed May 08, 2010 229 230 231 232  * accepts only filled endpoint packets of audio samples. */ #define EP_ACCEPTS_ONLY_FULL_PACKETS (1 << 7)  Dean Camera committed Jun 17, 2010 233  /** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint  Dean Camera committed May 08, 2010 234 235 236 237 238  * will accept partially filled endpoint packets of audio samples. */ #define EP_ACCEPTS_SMALL_PACKETS (0 << 7) /* Type Defines: */  Dean Camera committed Jun 17, 2010 239  /** \brief Audio class-specific Interface Descriptor.  Dean Camera committed May 08, 2010 240  *  Dean Camera committed Jun 17, 2010 241  * Type define for an Audio class-specific interface descriptor. This follows a regular interface descriptor to  Dean Camera committed May 08, 2010 242 243 244 245 246  * supply extra information about the audio device's layout to the host. See the USB Audio specification for more * details. */ typedef struct {  Dean Camera committed Jun 17, 2010 247 248  USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */ uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */  Dean Camera committed May 08, 2010 249   Dean Camera committed Jun 17, 2010 250 251  uint16_t ACSpecification; /**< Binary coded decimal value, indicating the supported Audio Class specification version. */ uint16_t TotalLength; /**< Total length of the Audio class-specific descriptors, including this descriptor. */  Dean Camera committed May 08, 2010 252   Dean Camera committed Jun 17, 2010 253 254  uint8_t InCollection; /**< Total number of audio class interfaces within this device. */ uint8_t InterfaceNumbers[1]; /**< Interface numbers of each audio interface. */  Dean Camera committed May 08, 2010 255 256  } USB_Audio_Interface_AC_t;  Dean Camera committed Jun 17, 2010 257  /** \brief Audio class-specific Feature Unit Descriptor.  Dean Camera committed May 08, 2010 258  *  Dean Camera committed Jun 17, 2010 259  * Type define for an Audio class-specific Feature Unit descriptor. This indicates to the host what features  Dean Camera committed May 08, 2010 260 261 262 263 264  * are present in the device's audio stream for basic control, such as per-channel volume. See the USB Audio * specification for more details. */ typedef struct {  Dean Camera committed Jun 17, 2010 265 266  USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */ uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */  Dean Camera committed May 08, 2010 267   Dean Camera committed Jun 17, 2010 268 269  uint8_t UnitID; /**< ID value of this feature unit - must be a unique value within the device. */ uint8_t SourceID; /**< Source ID value of the audio source input into this feature unit. */  Dean Camera committed May 08, 2010 270   Dean Camera committed Jun 17, 2010 271 272  uint8_t ControlSize; /**< Size of each element in the ChanelControlls array. */ uint8_t ChannelControls[3]; /**< Feature masks for the control channel, and each separate audio channel. */  Dean Camera committed May 08, 2010 273   Dean Camera committed Jun 17, 2010 274  uint8_t FeatureUnitStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */  Dean Camera committed May 08, 2010 275 276  } USB_Audio_FeatureUnit_t;  Dean Camera committed Jun 17, 2010 277  /** \brief Audio class-specific Input Terminal Descriptor.  Dean Camera committed May 08, 2010 278  *  Dean Camera committed Jun 17, 2010 279  * Type define for an Audio class-specific input terminal descriptor. This indicates to the host that the device  Dean Camera committed May 08, 2010 280 281 282 283 284  * contains an input audio source, either from a physical terminal on the device, or a logical terminal (for example, * a USB endpoint). See the USB Audio specification for more details. */ typedef struct {  Dean Camera committed Jun 17, 2010 285 286  USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */ uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */  Dean Camera committed May 08, 2010 287   Dean Camera committed Jun 17, 2010 288 289  uint8_t TerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */ uint16_t TerminalType; /**< Type of terminal, a TERMINAL_* mask. */  Dean Camera committed May 08, 2010 290  uint8_t AssociatedOutputTerminal; /**< ID of associated output terminal, for physically grouped terminals  Dean Camera committed Jun 17, 2010 291  * such as the speaker and microphone of a phone handset.  Dean Camera committed May 08, 2010 292 293  */ uint8_t TotalChannels; /**< Total number of separate audio channels within this interface (right, left, etc.) */  Dean Camera committed Jun 17, 2010 294  uint16_t ChannelConfig; /**< CHANNEL_* masks indicating what channel layout is supported by this terminal. */  Dean Camera committed May 08, 2010 295   Dean Camera committed Jun 17, 2010 296 297  uint8_t ChannelStrIndex; /**< Index of a string descriptor describing this channel within the device. */ uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */  Dean Camera committed May 08, 2010 298 299  } USB_Audio_InputTerminal_t;  Dean Camera committed Jun 17, 2010 300  /** \brief Audio class-specific Output Terminal Descriptor.  Dean Camera committed May 08, 2010 301  *  Dean Camera committed Jun 17, 2010 302  * Type define for an Audio class-specific output terminal descriptor. This indicates to the host that the device  Dean Camera committed May 08, 2010 303 304 305 306 307  * contains an output audio sink, either to a physical terminal on the device, or a logical terminal (for example, * a USB endpoint). See the USB Audio specification for more details. */ typedef struct {  Dean Camera committed Jun 17, 2010 308 309  USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */ uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */  Dean Camera committed May 08, 2010 310   Dean Camera committed Jun 17, 2010 311 312  uint8_t TerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */ uint16_t TerminalType; /**< Type of terminal, a TERMINAL_* mask. */  Dean Camera committed May 08, 2010 313  uint8_t AssociatedInputTerminal; /**< ID of associated input terminal, for physically grouped terminals  Dean Camera committed Jun 17, 2010 314  * such as the speaker and microphone of a phone handset.  Dean Camera committed May 08, 2010 315  */  Dean Camera committed Jun 17, 2010 316  uint8_t SourceID; /**< ID value of the unit this terminal's audio is sourced from. */  Dean Camera committed May 08, 2010 317   Dean Camera committed Jun 17, 2010 318  uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */  Dean Camera committed May 08, 2010 319 320  } USB_Audio_OutputTerminal_t;  Dean Camera committed Jun 17, 2010 321  /** \brief Audio class-specific Streaming Audio Interface Descriptor.  Dean Camera committed May 08, 2010 322  *  Dean Camera committed Jun 17, 2010 323  * Type define for an Audio class-specific streaming interface descriptor. This indicates to the host  Dean Camera committed May 08, 2010 324 325 326 327  * how audio streams within the device are formatted. See the USB Audio specification for more details. */ typedef struct {  Dean Camera committed Jun 17, 2010 328 329  USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */ uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */  Dean Camera committed May 08, 2010 330   Dean Camera committed Jun 17, 2010 331  uint8_t TerminalLink; /**< ID value of the output terminal this descriptor is describing. */  Dean Camera committed May 08, 2010 332   Dean Camera committed Jun 17, 2010 333 334  uint8_t FrameDelay; /**< Delay in frames resulting from the complete sample processing from input to output. */ uint16_t AudioFormat; /**< Format of the audio stream, see Audio Device Formats specification. */  Dean Camera committed May 08, 2010 335 336 337 338 339  } USB_Audio_Interface_AS_t; /** \brief 24-Bit Audio Frequency Structure. * * Type define for a 24bit audio sample frequency structure. GCC does not contain a built in 24bit datatype,  Dean Camera committed Jun 17, 2010 340  * this this structure is used to build up the value instead. Fill this structure with the \ref AUDIO_SAMPLE_FREQ() macro.  Dean Camera committed May 08, 2010 341 342 343  */ typedef struct {  Dean Camera committed Jun 17, 2010 344 345  uint16_t LowWord; /**< Low 16 bits of the 24-bit value. */ uint8_t HighByte; /**< Upper 8 bits of the 24-bit value. */  Dean Camera committed May 08, 2010 346 347  } USB_Audio_SampleFreq_t;  Dean Camera committed Jun 17, 2010 348  /** \brief Audio class-specific Format Descriptor.  Dean Camera committed May 08, 2010 349  *  Dean Camera committed Jun 17, 2010 350  * Type define for an Audio class-specific audio format descriptor. This is used to give the host full details  Dean Camera committed May 08, 2010 351 352 353 354 355  * about the number of channels, the sample resolution, acceptable sample frequencies and encoding method used * in the device's audio streams. See the USB Audio specification for more details. */ typedef struct {  Dean Camera committed Jun 17, 2010 356 357  USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */ uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */  Dean Camera committed May 08, 2010 358   Dean Camera committed Jun 17, 2010 359 360  uint8_t FormatType; /**< Format of the audio stream, see Audio Device Formats specification. */ uint8_t Channels; /**< Total number of discrete channels in the stream. */  Dean Camera committed May 08, 2010 361   Dean Camera committed Jun 17, 2010 362 363  uint8_t SubFrameSize; /**< Size in bytes of each channel's sample data in the stream. */ uint8_t BitResolution; /**< Bits of resolution of each channel's samples in the stream. */  Dean Camera committed May 08, 2010 364   Dean Camera committed Jun 17, 2010 365 366  uint8_t SampleFrequencyType; /**< Total number of sample frequencies supported by the device. */ USB_Audio_SampleFreq_t SampleFrequencies[AUDIO_TOTAL_SAMPLE_RATES]; /**< Sample frequencies supported by the device. */  Dean Camera committed May 08, 2010 367 368  } USB_Audio_Format_t;  Dean Camera committed Jun 17, 2010 369  /** \brief Audio class-specific Streaming Endpoint Descriptor.  Dean Camera committed May 08, 2010 370  *  Dean Camera committed Jun 17, 2010 371 372  * Type define for an Audio class-specific endpoint descriptor. This contains a regular endpoint * descriptor with a few Audio-class-specific extensions. See the USB Audio specification for more details.  Dean Camera committed May 08, 2010 373 374 375  */ typedef struct {  Dean Camera committed Jun 17, 2010 376  USB_Descriptor_Endpoint_t Endpoint; /**< Standard endpoint descriptor describing the audio endpoint. */  Dean Camera committed May 08, 2010 377   Dean Camera committed Jun 17, 2010 378 379  uint8_t Refresh; /**< Always set to zero for Audio class devices. */ uint8_t SyncEndpointNumber; /**< Endpoint address to send synchronization information to, if needed (zero otherwise). */  Dean Camera committed May 08, 2010 380 381  } USB_Audio_StreamEndpoint_Std_t;  Dean Camera committed Jun 17, 2010 382  /** \brief Audio class-specific Extended Endpoint Descriptor.  Dean Camera committed May 08, 2010 383  *  Dean Camera committed Jun 17, 2010 384  * Type define for an Audio class-specific extended endpoint descriptor. This contains extra information  Dean Camera committed May 08, 2010 385  * on the usage of endpoints used to stream audio in and out of the USB Audio device, and follows an Audio  Dean Camera committed Jun 17, 2010 386  * class-specific extended endpoint descriptor. See the USB Audio specification for more details.  Dean Camera committed May 08, 2010 387 388 389  */ typedef struct {  Dean Camera committed Jun 17, 2010 390 391  USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */ uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */  Dean Camera committed May 08, 2010 392   Dean Camera committed Jun 17, 2010 393  uint8_t Attributes; /**< Audio class-specific endpoint attributes, such as ACCEPTS_SMALL_PACKETS. */  Dean Camera committed May 08, 2010 394   Dean Camera committed Jun 17, 2010 395 396  uint8_t LockDelayUnits; /**< Units used for the LockDelay field, see Audio class specification. */ uint16_t LockDelay; /**< Time required to internally lock endpoint's internal clock recovery circuitry. */  Dean Camera committed May 08, 2010 397 398 399 400 401 402 403 404 405 406  } USB_Audio_StreamEndpoint_Spc_t; /* Disable C linkage for C++ Compilers: */ #if defined(__cplusplus) } #endif #endif /** @} */