reactos/lib/drivers/sound/mmebuddy/functiontable.c

   1 /*
   2  * PROJECT:     ReactOS Sound System "MME Buddy" Library
   3  * LICENSE:     GPL - See COPYING in the top level directory
   4  * FILE:        lib/drivers/sound/mmebuddy/functiontable.c
   5  *
   6  * PURPOSE:     Routes function calls through a function table, calling
   7  *              implementation-defined routines or a default function, depending
   8  *              on configuration.
   9  *
  10  * PROGRAMMERS: Andrew Greenwood (silverblade@reactos.org)
  11 */
  12
  13 #include <windows.h>
  14 #include <mmsystem.h>
  15 #include <mmddk.h>
  16 #include <mmebuddy.h>
  17
  18 /*
  19     Attaches a function table to a sound device. Any NULL entries in this
  20     table are automatically set to point to a default routine to handle
  21     the appropriate function. If NULL is passed as the function table itself,
  22     the entire function table will use only the default routines.
  23 */
  24 MMRESULT
  25 SetSoundDeviceFunctionTable(
  26     IN  PSOUND_DEVICE SoundDevice,
  27     IN  PMMFUNCTION_TABLE FunctionTable OPTIONAL)
  28 {
  29     VALIDATE_MMSYS_PARAMETER( IsValidSoundDevice(SoundDevice) );
  30
  31     /* Zero out the existing function table (if present) */
  32     ZeroMemory(&SoundDevice->FunctionTable, sizeof(MMFUNCTION_TABLE));
  33
  34     if ( FunctionTable )
  35     {
  36         /* Fill in the client-supplied functions */
  37         CopyMemory(&SoundDevice->FunctionTable,
  38                    FunctionTable,
  39                    sizeof(MMFUNCTION_TABLE));
  40     }
  41
  42     return MMSYSERR_NOERROR;
  43 }
  44
  45 /*
  46     Retrieves the function table for a sound device, as previously set using
  47     SetSoundDeviceFunctionTable.
  48 */
  49 MMRESULT
  50 GetSoundDeviceFunctionTable(
  51     IN  PSOUND_DEVICE SoundDevice,
  52     OUT PMMFUNCTION_TABLE* FunctionTable)
  53 {
  54     VALIDATE_MMSYS_PARAMETER( IsValidSoundDevice(SoundDevice) );
  55     VALIDATE_MMSYS_PARAMETER( FunctionTable );
  56
  57     *FunctionTable = &SoundDevice->FunctionTable;
  58
  59     return MMSYSERR_NOERROR;
  60 }