LUFA/Drivers/USB/Class/Host/Audio.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2011.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2011  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 disclaim 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 Host mode driver for the library USB Audio 1.0 Class driver.
  33  *
  34  *  Host mode driver 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_USBClassAudioHost Audio 1.0 Class Host Mode Driver
  42  *
  43  *  \section Sec_Dependencies Module Source Dependencies
  44  *  The following files must be built with any user project that uses this module:
  45  *    - LUFA/Drivers/USB/Class/Host/Audio.c <i>(Makefile source module name: LUFA_SRC_USBCLASS)</i>
  46  *
  47  *  \section Sec_ModDescription Module Description
  48  *  Host Mode USB Class driver framework interface, for the Audio 1.0 USB Class driver.
  49  *
  50  *  @{
  51  */
  52
  53 #ifndef __AUDIO_CLASS_HOST_H__
  54 #define __AUDIO_CLASS_HOST_H__
  55
  56         /* Includes: */
  57                 #include "../../USB.h"
  58                 #include "../Common/Audio.h"
  59
  60         /* Enable C linkage for C++ Compilers: */
  61                 #if defined(__cplusplus)
  62                         extern "C" {
  63                 #endif
  64
  65         /* Preprocessor Checks: */
  66                 #if !defined(__INCLUDE_FROM_AUDIO_DRIVER)
  67                         #error Do not include this file directly. Include LUFA/Drivers/USB.h instead.
  68                 #endif
  69
  70         /* Public Interface - May be used in end-application: */
  71                 /* Type Defines: */
  72                         /** \brief Audio Class Host Mode Configuration and State Structure.
  73                          *
  74                          *  Class state structure. An instance of this structure should be made within the user application,
  75                          *  and passed to each of the Audio class driver functions as the \c AudioInterfaceInfo parameter. This
  76                          *  stores each Audio interface's configuration and state information.
  77                          */
  78                         typedef struct
  79                         {
  80                                 const struct
  81                                 {
  82                                         uint8_t  DataINPipeNumber; /**< Pipe number of the Audio interface's IN data pipe. If this interface should not
  83                                                                     *   bind to an IN endpoint, this may be set to 0 to disable audio input streaming for
  84                                                                     *   this driver instance.
  85                                                                     */
  86                                         uint8_t  DataOUTPipeNumber; /**< Pipe number of the Audio interface's OUT data pipe. If this interface should not
  87                                                                     *   bind to an OUT endpoint, this may be set to 0 to disable audio output streaming for
  88                                                                     *   this driver instance.
  89                                                                     */
  90                                 } Config; /**< Config data for the USB class interface within the device. All elements in this section
  91                                            *   <b>must</b> be set or the interface will fail to enumerate and operate correctly.
  92                                            */
  93                                 struct
  94                                 {
  95                                         bool IsActive; /**< Indicates if the current interface instance is connected to an attached device, valid
  96                                                         *   after \ref Audio_Host_ConfigurePipes() is called and the Host state machine is in the
  97                                                         *   Configured state.
  98                                                         */
  99                                         uint8_t ControlInterfaceNumber; /**< Interface index of the Audio Control interface within the attached device. */
 100                                         uint8_t StreamingInterfaceNumber; /**< Interface index of the Audio Streaming interface within the attached device. */
 101
 102                                         uint8_t EnabledStreamingAltIndex; /**< Alternative setting index of the Audio Streaming interface when the stream is enabled. */
 103
 104                                         uint16_t DataINPipeSize; /**< Size in bytes of the Audio interface's IN data pipe. */
 105                                         uint16_t DataOUTPipeSize;  /**< Size in bytes of the Audio interface's OUT data pipe. */
 106                                 } State; /**< State data for the USB class interface within the device. All elements in this section
 107                                                   *   <b>may</b> be set to initial values, but may also be ignored to default to sane values when
 108                                                   *   the interface is enumerated.
 109                                                   */
 110                         } USB_ClassInfo_Audio_Host_t;
 111
 112                 /* Enums: */
 113                         /** Enum for the possible error codes returned by the \ref Audio_Host_ConfigurePipes() function. */
 114                         enum AUDIO_Host_EnumerationFailure_ErrorCodes_t
 115                         {
 116                                 AUDIO_ENUMERROR_NoError                    = 0, /**< Configuration Descriptor was processed successfully. */
 117                                 AUDIO_ENUMERROR_InvalidConfigDescriptor    = 1, /**< The device returned an invalid Configuration Descriptor. */
 118                                 AUDIO_ENUMERROR_NoCompatibleInterfaceFound = 2, /**< A compatible AUDIO interface was not found in the device's Configuration Descriptor. */
 119                                 AUDIO_ENUMERROR_PipeConfigurationFailed    = 3, /**< One or more pipes for the specified interface could not be configured correctly. */
 120                         };
 121
 122                 /* Function Prototypes: */
 123                         /** Host interface configuration routine, to configure a given Audio host interface instance using the Configuration
 124                          *  Descriptor read from an attached USB device. This function automatically updates the given Audio Host instance's
 125                          *  state values and configures the pipes required to communicate with the interface if it is found within the
 126                          *  device. This should be called once after the stack has enumerated the attached device, while the host state
 127                          *  machine is in the Addressed state.
 128                          *
 129                          *  \param[in,out] AudioInterfaceInfo      Pointer to a structure containing an Audio Class host configuration and state.
 130                          *  \param[in]     ConfigDescriptorSize    Length of the attached device's Configuration Descriptor.
 131                          *  \param[in]     DeviceConfigDescriptor  Pointer to a buffer containing the attached device's Configuration Descriptor.
 132                          *
 133                          *  \return A value from the \ref AUDIO_Host_EnumerationFailure_ErrorCodes_t enum.
 134                          */
 135                         uint8_t Audio_Host_ConfigurePipes(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 136                                                           uint16_t ConfigDescriptorSize,
 137                                                           void* DeviceConfigDescriptor) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(3);
 138
 139                         /** Starts or stops the audio streaming for the given configured Audio Host interface, allowing for audio samples to be
 140                          *  send and/or received.
 141                          *
 142                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class host configuration and state.
 143                          *  \param[in]     EnableStreaming     Boolean true to enable streaming of the specified interface, false to disable
 144                          *
 145                          *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum.
 146                          */
 147                         uint8_t Audio_Host_StartStopStreaming(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 148                                                               const bool EnableStreaming);
 149
 150                         /** Gets or sets the specified property of a streaming audio class endpoint that is bound to a pipe in the given
 151                          *  class instance.
 152                          *
 153                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class host configuration and state.
 154                          *  \param[in]     DataPipeIndex       Index of the data pipe whose bound endpoint is to be altered.
 155                          *  \param[in]     EndpointProperty    Property of the endpoint to get or set, a value from \ref Audio_ClassRequests_t.
 156                          *  \param[in]     EndpointControl     Parameter of the endpoint to get or set, a value from \ref Audio_EndpointControls_t.
 157                          *  \param[in,out] DataLength          For SET operations, the length of the parameter data to set. For GET operations, the maximum
 158                          *                                     length of the retrieved data.
 159                          *  \param[in,out] Data                Pointer to a location where the parameter data is stored for SET operations, or where
 160                          *                                     the retrieved data is to be stored for GET operations.
 161                          *
 162                          *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum.
 163                          */
 164                         uint8_t Audio_Host_GetSetEndpointProperty(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 165                                                                   const uint8_t DataPipeIndex,
 166                                                                   const uint8_t EndpointProperty,
 167                                                                   const uint8_t EndpointControl,
 168                                                                   const uint16_t DataLength,
 169                                                                   void* const Data);
 170
 171                 /* Inline Functions: */
 172                         /** General management task for a given Audio host class interface, required for the correct operation of
 173                          *  the interface. This should be called frequently in the main program loop, before the master USB management task
 174                          *  \ref USB_USBTask().
 175                          *
 176                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class host configuration and state.
 177                          */
 178                         static inline void Audio_Host_USBTask(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo);
 179                         static inline void Audio_Host_USBTask(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 180                         {
 181                                 (void)AudioInterfaceInfo;
 182                         }
 183
 184                         /** Determines if the given audio interface is ready for a sample to be read from it, and selects the streaming
 185                          *  IN pipe ready for reading.
 186                          *
 187                          *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or
 188                          *       the call will fail.
 189                          *
 190                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 191                          *
 192                          *  \return Boolean \c true if the given Audio interface has a sample to be read, \c false otherwise.
 193                          */
 194                         static inline bool Audio_Host_IsSampleReceived(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 195                                                                          ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 196                         static inline bool Audio_Host_IsSampleReceived(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 197                         {
 198                                 if ((USB_HostState != HOST_STATE_Configured) || !(AudioInterfaceInfo->State.IsActive))
 199                                   return false;
 200
 201                                 bool SampleReceived = false;
 202
 203                                 Pipe_SelectPipe(AudioInterfaceInfo->Config.DataINPipeNumber);
 204                                 Pipe_Unfreeze();
 205                                 SampleReceived = Pipe_IsINReceived();
 206                                 Pipe_Freeze();
 207
 208                                 return SampleReceived;
 209                         }
 210
 211                         /** Determines if the given audio interface is ready to accept the next sample to be written to it, and selects
 212                          *  the streaming OUT pipe ready for writing.
 213                          *
 214                          *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or
 215                          *       the call will fail.
 216                          *
 217                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 218                          *
 219                          *  \return Boolean \c true if the given Audio interface is ready to accept the next sample, \c false otherwise.
 220                          */
 221                         static inline bool Audio_Host_IsReadyForNextSample(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 222                                                                              ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 223                         static inline bool Audio_Host_IsReadyForNextSample(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 224                         {
 225                                 if ((USB_HostState != HOST_STATE_Configured) || !(AudioInterfaceInfo->State.IsActive))
 226                                   return false;
 227
 228                                 Pipe_SelectPipe(AudioInterfaceInfo->Config.DataOUTPipeNumber);
 229                                 return Pipe_IsOUTReady();
 230                         }
 231
 232                         /** Reads the next 8-bit audio sample from the current audio interface.
 233                          *
 234                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsSampleReceived() function to ensure
 235                          *       that the correct pipe is selected and ready for data.
 236                          *
 237                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 238                          *
 239                          *  \return  Signed 8-bit audio sample from the audio interface.
 240                          */
 241                         static inline int8_t Audio_Host_ReadSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 242                                                                       ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 243                         static inline int8_t Audio_Host_ReadSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 244                         {
 245                                 int8_t Sample;
 246
 247                                 (void)AudioInterfaceInfo;
 248
 249                                 Sample = Pipe_Read_8();
 250
 251                                 if (!(Pipe_BytesInPipe()))
 252                                 {
 253                                         Pipe_Unfreeze();
 254                                         Pipe_ClearIN();
 255                                         Pipe_Freeze();
 256                                 }
 257
 258                                 return Sample;
 259                         }
 260
 261                         /** Reads the next 16-bit audio sample from the current audio interface.
 262                          *
 263                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsSampleReceived() function to ensure
 264                          *       that the correct pipe is selected and ready for data.
 265                          *
 266                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 267                          *
 268                          *  \return  Signed 16-bit audio sample from the audio interface.
 269                          */
 270                         static inline int16_t Audio_Host_ReadSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 271                                                                         ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 272                         static inline int16_t Audio_Host_ReadSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 273                         {
 274                                 int16_t Sample;
 275
 276                                 (void)AudioInterfaceInfo;
 277
 278                                 Sample = (int16_t)Pipe_Read_16_LE();
 279
 280                                 if (!(Pipe_BytesInPipe()))
 281                                 {
 282                                         Pipe_Unfreeze();
 283                                         Pipe_ClearIN();
 284                                         Pipe_Freeze();
 285                                 }
 286
 287                                 return Sample;
 288                         }
 289
 290                         /** Reads the next 24-bit audio sample from the current audio interface.
 291                          *
 292                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsSampleReceived() function to ensure
 293                          *       that the correct pipe is selected and ready for data.
 294                          *
 295                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 296                          *
 297                          *  \return Signed 24-bit audio sample from the audio interface.
 298                          */
 299                         static inline int32_t Audio_Host_ReadSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 300                                                                         ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 301                         static inline int32_t Audio_Host_ReadSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 302                         {
 303                                 int32_t Sample;
 304
 305                                 (void)AudioInterfaceInfo;
 306
 307                                 Sample = (((uint32_t)Pipe_Read_8() << 16) | Pipe_Read_16_LE());
 308
 309                                 if (!(Pipe_BytesInPipe()))
 310                                 {
 311                                         Pipe_Unfreeze();
 312                                         Pipe_ClearIN();
 313                                         Pipe_Freeze();
 314                                 }
 315
 316                                 return Sample;
 317                         }
 318
 319                         /** Writes the next 8-bit audio sample to the current audio interface.
 320                          *
 321                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsReadyForNextSample() function to
 322                          *       ensure that the correct pipe is selected and ready for data.
 323                          *
 324                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 325                          *  \param[in]     Sample              Signed 8-bit audio sample.
 326                          */
 327                         static inline void Audio_Host_WriteSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 328                                                                      const int8_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 329                         static inline void Audio_Host_WriteSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 330                                                                      const int8_t Sample)
 331                         {
 332                                 Pipe_Write_8(Sample);
 333
 334                                 if (!(Pipe_IsReadWriteAllowed()))
 335                                 {
 336                                         Pipe_Unfreeze();
 337                                         Pipe_ClearOUT();
 338                                         Pipe_WaitUntilReady();
 339                                         Pipe_Freeze();
 340                                 }
 341                         }
 342
 343                         /** Writes the next 16-bit audio sample to the current audio interface.
 344                          *
 345                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsReadyForNextSample() function to
 346                          *       ensure that the correct pipe is selected and ready for data.
 347                          *
 348                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 349                          *  \param[in]     Sample              Signed 16-bit audio sample.
 350                          */
 351                         static inline void Audio_Host_WriteSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 352                                                                       const int16_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 353                         static inline void Audio_Host_WriteSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 354                                                                       const int16_t Sample)
 355                         {
 356                                 Pipe_Write_16_LE(Sample);
 357
 358                                 if (!(Pipe_IsReadWriteAllowed()))
 359                                 {
 360                                         Pipe_Unfreeze();
 361                                         Pipe_ClearOUT();
 362                                         Pipe_WaitUntilReady();
 363                                         Pipe_Freeze();
 364                                 }
 365                         }
 366
 367                         /** Writes the next 24-bit audio sample to the current audio interface.
 368                          *
 369                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsReadyForNextSample() function to
 370                          *       ensure that the correct pipe is selected and ready for data.
 371                          *
 372                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 373                          *  \param[in]     Sample              Signed 24-bit audio sample.
 374                          */
 375                         static inline void Audio_Host_WriteSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 376                                                                       const int32_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 377                         static inline void Audio_Host_WriteSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 378                                                                       const int32_t Sample)
 379                         {
 380                                 Pipe_Write_16_LE(Sample);
 381                                 Pipe_Write_8(Sample >> 16);
 382
 383                                 if (!(Pipe_IsReadWriteAllowed()))
 384                                 {
 385                                         Pipe_Unfreeze();
 386                                         Pipe_ClearOUT();
 387                                         Pipe_WaitUntilReady();
 388                                         Pipe_Freeze();
 389                                 }
 390                         }
 391
 392         /* Private Interface - For use in library only: */
 393         #if !defined(__DOXYGEN__)
 394                 /* Function Prototypes: */
 395                         #if defined(__INCLUDE_FROM_AUDIO_HOST_C)
 396                                 static uint8_t DCOMP_Audio_Host_NextAudioControlInterface(void* CurrentDescriptor);
 397                                 static uint8_t DCOMP_Audio_Host_NextAudioStreamInterface(void* CurrentDescriptor);
 398                                 static uint8_t DCOMP_Audio_Host_NextAudioInterfaceDataEndpoint(void* CurrentDescriptor);
 399                         #endif
 400         #endif
 401
 402         /* Disable C linkage for C++ Compilers: */
 403                 #if defined(__cplusplus)
 404                         }
 405                 #endif
 406
 407 #endif
 408
 409 /** @} */
 410