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 Class driver.
  33  *
  34  *  Host mode driver for the library USB Audio 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 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 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. */
  83                                         uint8_t  DataOUTPipeNumber; /**< Pipe number of the Audio interface's OUT data pipe. */
  84                                 } Config; /**< Config data for the USB class interface within the device. All elements in this section
  85                                            *   <b>must</b> be set or the interface will fail to enumerate and operate correctly.
  86                                            */
  87                                 struct
  88                                 {
  89                                         bool IsActive; /**< Indicates if the current interface instance is connected to an attached device, valid
  90                                                         *   after \ref Audio_Host_ConfigurePipes() is called and the Host state machine is in the
  91                                                         *   Configured state.
  92                                                         */
  93                                         uint8_t ControlInterfaceNumber; /**< Interface index of the Audio Control interface within the attached device. */
  94                                         uint8_t StreamingInterfaceNumber; /**< Interface index of the Audio Streaming interface within the attached device. */
  95
  96                                         uint8_t EnabledStreamingAltIndex; /**< Alternative setting index of the Audio Streaming interface when the stream is enabled. */
  97
  98                                         uint16_t DataINPipeSize; /**< Size in bytes of the Audio interface's IN data pipe. */
  99                                         uint16_t DataOUTPipeSize;  /**< Size in bytes of the Audio interface's OUT data pipe. */
 100                                 } State; /**< State data for the USB class interface within the device. All elements in this section
 101                                                   *   <b>may</b> be set to initial values, but may also be ignored to default to sane values when
 102                                                   *   the interface is enumerated.
 103                                                   */
 104                         } USB_ClassInfo_Audio_Host_t;
 105
 106                 /* Enums: */
 107                         /** Enum for the possible error codes returned by the \ref Audio_Host_ConfigurePipes() function. */
 108                         enum AUDIO_Host_EnumerationFailure_ErrorCodes_t
 109                         {
 110                                 AUDIO_ENUMERROR_NoError                    = 0, /**< Configuration Descriptor was processed successfully. */
 111                                 AUDIO_ENUMERROR_InvalidConfigDescriptor    = 1, /**< The device returned an invalid Configuration Descriptor. */
 112                                 AUDIO_ENUMERROR_NoCompatibleInterfaceFound = 2, /**< A compatible AUDIO interface was not found in the device's Configuration Descriptor. */
 113                                 AUDIO_ENUMERROR_PipeConfigurationFailed    = 3, /**< One or more pipes for the specified interface could not be configured correctly. */
 114                         };
 115
 116                 /* Function Prototypes: */
 117                         /** Host interface configuration routine, to configure a given Audio host interface instance using the Configuration
 118                          *  Descriptor read from an attached USB device. This function automatically updates the given Audio Host instance's
 119                          *  state values and configures the pipes required to communicate with the interface if it is found within the
 120                          *  device. This should be called once after the stack has enumerated the attached device, while the host state
 121                          *  machine is in the Addressed state.
 122                          *
 123                          *  \param[in,out] AudioInterfaceInfo      Pointer to a structure containing an Audio Class host configuration and state.
 124                          *  \param[in]     ConfigDescriptorSize    Length of the attached device's Configuration Descriptor.
 125                          *  \param[in]     DeviceConfigDescriptor  Pointer to a buffer containing the attached device's Configuration Descriptor.
 126                          *
 127                          *  \return A value from the \ref AUDIO_Host_EnumerationFailure_ErrorCodes_t enum.
 128                          */
 129                         uint8_t Audio_Host_ConfigurePipes(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 130                                                           uint16_t ConfigDescriptorSize,
 131                                                           void* DeviceConfigDescriptor) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(3);
 132
 133                         /** Starts or stops the audio streaming for the given configured Audio Host interface, allowing for audio samples to be
 134                          *  send and/or received.
 135                          *
 136                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class host configuration and state.
 137                          *  \param[in]     EnableStreaming     Boolean true to enable streaming of the specified interface, false to disable
 138                          *
 139                          *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum.
 140                          */
 141                         uint8_t AUDIO_Host_StartStopStreaming(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 142                                                               bool EnableStreaming);
 143
 144                 /* Inline Functions: */
 145                         /** General management task for a given Audio host class interface, required for the correct operation of
 146                          *  the interface. This should be called frequently in the main program loop, before the master USB management task
 147                          *  \ref USB_USBTask().
 148                          *
 149                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class host configuration and state.
 150                          */
 151                         static inline void Audio_Host_USBTask(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo);
 152                         static inline void Audio_Host_USBTask(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 153                         {
 154                                 (void)AudioInterfaceInfo;
 155                         }
 156
 157                         /** Determines if the given audio interface is ready for a sample to be read from it, and selects the streaming
 158                          *  IN pipe ready for reading.
 159                          *
 160                          *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or
 161                          *       the call will fail.
 162                          *
 163                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 164                          *
 165                          *  \return Boolean \c true if the given Audio interface has a sample to be read, \c false otherwise.
 166                          */
 167                         static inline bool Audio_Host_IsSampleReceived(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 168                                                                          ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 169                         static inline bool Audio_Host_IsSampleReceived(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 170                         {
 171                                 if ((USB_HostState != HOST_STATE_Configured) || !(AudioInterfaceInfo->State.IsActive))
 172                                   return false;
 173
 174                                 Pipe_SelectPipe(AudioInterfaceInfo->Config.DataOUTPipeNumber);
 175                                 return Pipe_IsINReceived();
 176                         }
 177
 178                         /** Determines if the given audio interface is ready to accept the next sample to be written to it, and selects
 179                          *  the streaming OUT pipe ready for writing.
 180                          *
 181                          *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or
 182                          *       the call will fail.
 183                          *
 184                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 185                          *
 186                          *  \return Boolean \c true if the given Audio interface is ready to accept the next sample, \c false otherwise.
 187                          */
 188                         static inline bool Audio_Host_IsReadyForNextSample(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 189                                                                              ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 190                         static inline bool Audio_Host_IsReadyForNextSample(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 191                         {
 192                                 if ((USB_HostState != HOST_STATE_Configured) || !(AudioInterfaceInfo->State.IsActive))
 193                                   return false;
 194
 195                                 Pipe_SelectPipe(AudioInterfaceInfo->Config.DataINPipeNumber);
 196                                 return Pipe_IsOUTReady();
 197                         }
 198
 199                         /** Reads the next 8-bit audio sample from the current audio interface.
 200                          *
 201                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsSampleReceived() function to ensure
 202                          *       that the correct pipe is selected and ready for data.
 203                          *
 204                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 205                          *
 206                          *  \return  Signed 8-bit audio sample from the audio interface.
 207                          */
 208                         static inline int8_t Audio_Host_ReadSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 209                                                                       ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 210                         static inline int8_t Audio_Host_ReadSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 211                         {
 212                                 int8_t Sample;
 213
 214                                 (void)AudioInterfaceInfo;
 215
 216                                 Sample = Pipe_Read_8();
 217
 218                                 if (!(Pipe_BytesInPipe()))
 219                                   Pipe_ClearIN();
 220
 221                                 return Sample;
 222                         }
 223
 224                         /** Reads the next 16-bit audio sample from the current audio interface.
 225                          *
 226                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsSampleReceived() function to ensure
 227                          *       that the correct pipe is selected and ready for data.
 228                          *
 229                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 230                          *
 231                          *  \return  Signed 16-bit audio sample from the audio interface.
 232                          */
 233                         static inline int16_t Audio_Host_ReadSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 234                                                                         ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 235                         static inline int16_t Audio_Host_ReadSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 236                         {
 237                                 int16_t Sample;
 238
 239                                 (void)AudioInterfaceInfo;
 240
 241                                 Sample = (int16_t)Pipe_Read_16_LE();
 242
 243                                 if (!(Pipe_BytesInPipe()))
 244                                   Pipe_ClearIN();
 245
 246                                 return Sample;
 247                         }
 248
 249                         /** Reads the next 24-bit audio sample from the current audio interface.
 250                          *
 251                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsSampleReceived() function to ensure
 252                          *       that the correct pipe is selected and ready for data.
 253                          *
 254                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 255                          *
 256                          *  \return Signed 24-bit audio sample from the audio interface.
 257                          */
 258                         static inline int32_t Audio_Host_ReadSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 259                                                                         ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 260                         static inline int32_t Audio_Host_ReadSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo)
 261                         {
 262                                 int32_t Sample;
 263
 264                                 (void)AudioInterfaceInfo;
 265
 266                                 Sample = (((uint32_t)Pipe_Read_8() << 16) | Pipe_Read_16_LE());
 267
 268                                 if (!(Pipe_BytesInPipe()))
 269                                   Pipe_ClearIN();
 270
 271                                 return Sample;
 272                         }
 273
 274                         /** Writes the next 8-bit audio sample to the current audio interface.
 275                          *
 276                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsReadyForNextSample() function to
 277                          *       ensure that the correct pipe is selected and ready for data.
 278                          *
 279                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 280                          *  \param[in]     Sample              Signed 8-bit audio sample.
 281                          */
 282                         static inline void Audio_Host_WriteSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 283                                                                      const int8_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 284                         static inline void Audio_Host_WriteSample8(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 285                                                                      const int8_t Sample)
 286                         {
 287                                 Pipe_Write_8(Sample);
 288
 289                                 if (Pipe_BytesInPipe() == AudioInterfaceInfo->State.DataINPipeSize)
 290                                   Pipe_ClearOUT();
 291                         }
 292
 293                         /** Writes the next 16-bit audio sample to the current audio interface.
 294                          *
 295                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsReadyForNextSample() function to
 296                          *       ensure that the correct pipe is selected and ready for data.
 297                          *
 298                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 299                          *  \param[in]     Sample              Signed 16-bit audio sample.
 300                          */
 301                         static inline void Audio_Host_WriteSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 302                                                                       const int16_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 303                         static inline void Audio_Host_WriteSample16(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 304                                                                       const int16_t Sample)
 305                         {
 306                                 Pipe_Write_16_LE(Sample);
 307
 308                                 if (Pipe_BytesInPipe() == AudioInterfaceInfo->State.DataINPipeSize)
 309                                   Pipe_ClearOUT();
 310                         }
 311
 312                         /** Writes the next 24-bit audio sample to the current audio interface.
 313                          *
 314                          *  \pre This should be preceded immediately by a call to the \ref Audio_Host_IsReadyForNextSample() function to
 315                          *       ensure that the correct pipe is selected and ready for data.
 316                          *
 317                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 318                          *  \param[in]     Sample              Signed 24-bit audio sample.
 319                          */
 320                         static inline void Audio_Host_WriteSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 321                                                                       const int32_t Sample) ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
 322                         static inline void Audio_Host_WriteSample24(USB_ClassInfo_Audio_Host_t* const AudioInterfaceInfo,
 323                                                                       const int32_t Sample)
 324                         {
 325                                 Pipe_Write_16_LE(Sample);
 326                                 Pipe_Write_8(Sample >> 16);
 327
 328                                 if (Pipe_BytesInPipe() == AudioInterfaceInfo->State.DataINPipeSize)
 329                                   Pipe_ClearOUT();
 330                         }
 331
 332         /* Private Interface - For use in library only: */
 333         #if !defined(__DOXYGEN__)
 334                 /* Function Prototypes: */
 335                         #if defined(__INCLUDE_FROM_AUDIO_HOST_C)
 336                                 static uint8_t DComp_NextAudioControlInterface(void* CurrentDescriptor);
 337                                 static uint8_t DComp_NextAudioStreamInterface(void* CurrentDescriptor);
 338                                 static uint8_t DComp_NextAudioInterfaceDataEndpoint(void* CurrentDescriptor);
 339                         #endif
 340         #endif
 341
 342         /* Disable C linkage for C++ Compilers: */
 343                 #if defined(__cplusplus)
 344                         }
 345                 #endif
 346
 347 #endif
 348
 349 /** @} */
 350