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

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   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 /** \ingroup Group_USBClassAudio
  32  *  @defgroup Group_USBClassAudioDevice Audio Class Device Mode Driver
  33  *
  34  *  \section Sec_Dependencies Module Source Dependencies
  35  *  The following files must be built with any user project that uses this module:
  36  *    - LUFA/Drivers/USB/Class/Device/Audio.c
  37  *
  38  *  \section Module Description
  39  *  Device Mode USB Class driver framework interface, for the Audio USB Class driver.
  40  *
  41  *  @{
  42  */
  43
  44 #ifndef _AUDIO_CLASS_DEVICE_H_
  45 #define _AUDIO_CLASS_DEVICE_H_
  46
  47         /* Includes: */
  48                 #include "../../USB.h"
  49                 #include "../Common/Audio.h"
  50
  51                 #include <string.h>
  52
  53         /* Enable C linkage for C++ Compilers: */
  54                 #if defined(__cplusplus)
  55                         extern "C" {
  56                 #endif
  57
  58         /* Public Interface - May be used in end-application: */
  59                 /* Type Defines: */
  60                         /** Class state structure. An instance of this structure should be made for each Audio interface
  61                          *  within the user application, and passed to each of the Audio class driver functions as the
  62                          *  AudioInterfaceInfo parameter. This stores each Audio interface's configuration and state information.
  63                          */
  64                         typedef struct
  65                         {
  66                                 const struct
  67                                 {
  68                                         uint8_t  StreamingInterfaceNumber; /**< Index of the Audio Streaming interface within the device this
  69                                                                                                                 *   structure controls.
  70                                                                                                                 */
  71
  72                                         uint8_t  DataINEndpointNumber; /**< Endpoint number of the incomming Audio Streaming data, if available
  73                                                                                                         *   (zero if unused).
  74                                                                                                         */
  75                                         uint16_t DataINEndpointSize; /**< Size in bytes of the incomming Audio Streaming data endpoint, if available
  76                                                                                                   *   (zero if unused).
  77                                                                                                   */
  78
  79                                         uint8_t  DataOUTEndpointNumber; /**< Endpoint number of the outgoing Audio Streaming data, if available
  80                                                                                                          *   (zero if unused).
  81                                                                                                          */
  82                                         uint16_t DataOUTEndpointSize; /**< Size in bytes of the outgoing Audio Streaming data endpoint, if available
  83                                                                                                    *   (zero if unused).
  84                                                                                                    */
  85                                 } Config; /**< Config data for the USB class interface within the device. All elements in this section
  86                                            *   <b>must</b> be set or the interface will fail to enumerate and operate correctly.
  87                                            */
  88                                 struct
  89                                 {
  90                                         bool     InterfaceEnabled; /**< Set and cleared by the class driver to indicate if the host has enabled the streaming endpoints
  91                                                                                                 *   of the Audio Streaming interface.
  92                                                                                                 */
  93                                 } State; /**< State data for the USB class interface within the device. All elements in this section
  94                                           *   <b>may</b> be set to initial values, but may also be ignored to default to sane values when
  95                                           *   the interface is enumerated.
  96                                           */
  97                         } USB_ClassInfo_Audio_Device_t;
  98
  99                 /* Function Prototypes: */
 100                         /** Configures the endpoints of a given Audio interface, ready for use. This should be linked to the library
 101                          *  \ref EVENT_USB_ConfigurationChanged() event so that the endpoints are configured when the configuration containing the
 102                          *  given Audio interface is selected.
 103                          *
 104                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 105                          *
 106                          *  \return Boolean true if the endpoints were sucessfully configured, false otherwise
 107                          */
 108                         bool Audio_Device_ConfigureEndpoints(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
 109
 110                         /** Processes incomming control requests from the host, that are directed to the given Audio class interface. This should be
 111                          *  linked to the library \ref EVENT_USB_UnhandledControlPacket() event.
 112                          *
 113                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 114                          */
 115                         void Audio_Device_ProcessControlPacket(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
 116
 117                         /** General management task for a given Audio class interface, required for the correct operation of the interface. This should
 118                          *  be called frequently in the main program loop, before the master USB management task \ref USB_USBTask().
 119                          *
 120                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 121                          */
 122                         void Audio_Device_USBTask(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
 123
 124                         /** Reads the next 8-bit audio sample from the current audio interface.
 125                          *
 126                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that
 127                          *        the correct endpoint is selected and ready for data.
 128                          *
 129                          *  \return  Signed 8-bit audio sample from the audio interface
 130                          */
 131                         int8_t Audio_Device_ReadSample8(void);
 132
 133                         /** Reads the next 16-bit audio sample from the current audio interface.
 134                          *
 135                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that
 136                          *        the correct endpoint is selected and ready for data.
 137                          *
 138                          *  \return  Signed 16-bit audio sample from the audio interface
 139                          */
 140                         int16_t Audio_Device_ReadSample16(void);
 141
 142                         /** Reads the next 24-bit audio sample from the current audio interface.
 143                          *
 144                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that
 145                          *        the correct endpoint is selected and ready for data.
 146                          *
 147                          *  \return  Signed 24-bit audio sample from the audio interface
 148                          */
 149                         int32_t Audio_Device_ReadSample24(void);
 150
 151                         /** Writes the next 8-bit audio sample to the current audio interface.
 152                          *
 153                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that
 154                          *        the correct endpoint is selected and ready for data.
 155                          *
 156                          *  \param[in] Sample  Signed 8-bit audio sample
 157                          */
 158                         void Audio_Device_WriteSample8(const int8_t Sample);
 159
 160                         /** Writes the next 16-bit audio sample to the current audio interface.
 161                          *
 162                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that
 163                          *        the correct endpoint is selected and ready for data.
 164                          *
 165                          *  \param[in] Sample  Signed 16-bit audio sample
 166                          */
 167                         void Audio_Device_WriteSample16(const int16_t Sample);
 168
 169                         /** Writes the next 24-bit audio sample to the current audio interface.
 170                          *
 171                          *  \note This should be preceeded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that
 172                          *        the correct endpoint is selected and ready for data.
 173                          *
 174                          *  \param[in] Sample  Signed 24-bit audio sample
 175                          */
 176                         void Audio_Device_WriteSample24(const int32_t Sample);
 177
 178                         /** Determines if the given audio interface is ready for a sample to be read from it.
 179                          *
 180                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 181                          *
 182                          *  \return Boolean true if the given Audio interface has a sample to be read, false otherwise
 183                          */
 184                         bool Audio_Device_IsSampleReceived(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
 185
 186                         /** Determines if the given audio interface is ready to accept the next sample to be written to it.
 187                          *
 188                          *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
 189                          *
 190                          *  \return Boolean true if the given Audio interface is ready to accept the next sample, false otherwise
 191                          */
 192                         bool Audio_Device_IsReadyForNextSample(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
 193
 194         /* Disable C linkage for C++ Compilers: */
 195                 #if defined(__cplusplus)
 196                         }
 197                 #endif
 198
 199 #endif
 200
 201 /** @} */