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sound.h

/*
 * sound.h
 *
 * Sound interface class.
 *
 * Portable Windows Library
 *
 * Copyright (c) 1993-1998 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Portable Windows Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Portions are Copyright (C) 1993 Free Software Foundation, Inc.
 * All Rights Reserved.
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: sound.h,v $
 * Revision 1.31  2004/11/01 23:16:59  ykiryanov
 * Added macro declaring sound plugin to be static for BeOS
 *
 * Revision 1.30  2003/12/28 02:03:18  csoutheren
 * Fixed problem with GetLastReadCount/GetLastWriteCount  on Windows sound devices
 *
 * Revision 1.29  2003/11/18 10:50:26  csoutheren
 * Changed name of Windows sound device
 *
 * Revision 1.28  2003/11/14 05:59:09  csoutheren
 * Added Read function, thanks to Derek Smithies
 *
 * Revision 1.27  2003/11/12 10:25:41  csoutheren
 * Changes to allow operation of static plugins under Windows
 *
 * Revision 1.26  2003/11/12 05:18:04  csoutheren
 * Added more backwards compatibility functions for PSoundChannel
 *
 * Revision 1.25  2003/11/12 04:33:32  csoutheren
 * Fixed problem with static linking of sound plugins
 * Fixed problem with Windows sound driver
 *
 * Revision 1.24  2003/11/12 03:29:51  csoutheren
 * Initial version of plugin code from Snark of GnomeMeeting with changes
 *    by Craig Southeren of Post Increment
 *
 * Revision 1.23.2.2  2003/10/13 02:42:39  dereksmithies
 * Add additional functions, so plugins work better.
 *
 * Revision 1.23.2.1  2003/10/07 03:02:28  csoutheren
 * Initial checkin of pwlib code to do plugins.
 * Modified from original code and concept provided by Snark of Gnomemeeting
 *
 * Revision 1.23  2003/09/17 05:41:59  csoutheren
 * Removed recursive includes
 *
 * Revision 1.22  2003/09/17 01:18:02  csoutheren
 * Removed recursive include file system and removed all references
 * to deprecated coooperative threading support
 *
 * Revision 1.21  2002/09/16 01:08:59  robertj
 * Added #define so can select if #pragma interface/implementation is used on
 *   platform basis (eg MacOS) rather than compiler, thanks Robert Monaghan.
 *
 * Revision 1.20  2002/02/08 09:58:44  robertj
 * Slight adjustment to API and documentation for volume functions.
 *
 * Revision 1.19  2002/02/07 20:57:21  dereks
 * add SetVolume and GetVolume methods to PSoundChannel
 *
 * Revision 1.18  2001/05/22 12:49:32  robertj
 * Did some seriously wierd rewrite of platform headers to eliminate the
 *   stupid GNU compiler warning about braces not matching.
 *
 * Revision 1.17  2001/02/07 03:33:43  craigs
 * Added functions to get sound channel parameters
 *
 * Revision 1.16  2000/03/04 10:15:32  robertj
 * Added simple play functions for sound files.
 *
 * Revision 1.15  1999/05/28 14:04:10  robertj
 * Added function to get default audio device.
 *
 * Revision 1.14  1999/03/09 02:59:51  robertj
 * Changed comments to doc++ compatible documentation.
 *
 * Revision 1.13  1999/02/22 10:15:14  robertj
 * Sound driver interface implementation to Linux OSS specification.
 *
 * Revision 1.12  1999/02/16 06:02:27  robertj
 * Major implementation to Linux OSS model
 *
 * Revision 1.11  1998/09/23 06:21:27  robertj
 * Added open source copyright license.
 *
 * Revision 1.10  1995/06/17 11:13:26  robertj
 * Documentation update.
 *
 * Revision 1.9  1995/03/14 12:42:40  robertj
 * Updated documentation to use HTML codes.
 *
 * Revision 1.8  1995/01/16  09:42:05  robertj
 * Documentation.
 *
 * Revision 1.7  1994/08/23  11:32:52  robertj
 * Oops
 *
 * Revision 1.6  1994/08/22  00:46:48  robertj
 * Added pragma fro GNU C++ compiler.
 *
 * Revision 1.5  1994/06/25  11:55:15  robertj
 * Unix version synchronisation.
 *
 * Revision 1.4  1994/01/03  04:42:23  robertj
 * Mass changes to common container classes and interactors etc etc etc.
 *
 * Revision 1.3  1993/09/29  03:06:30  robertj
 * Added unix compatibility to Beep()
 *
 * Revision 1.2  1993/07/14  12:49:16  robertj
 * Fixed RCS keywords.
 *
 */


#ifndef _PSOUND
#define _PSOUND

#ifdef P_USE_PRAGMA
#pragma interface
#endif

#include <ptlib/pluginmgr.h>

#if defined(_WIN32)
PWLIB_STATIC_LOAD_PLUGIN(PSoundChannel_WindowsMultimedia);
#elif defined(__BEOS__)
PWLIB_STATIC_LOAD_PLUGIN(PSoundChannelBeOS);
#endif


/** A class representing a sound. A sound is a highly platform dependent
   entity that is abstracted for use here. Very little manipulation of the
   sounds are possible.

   The most common sound to use is the static function #Beep()# which
   emits the system standard "warning" or "attention" sound.
 */
00158 class PSound : public PBYTEArray
{
  PCLASSINFO(PSound, PBYTEArray);

  public:
  /**@name Construction */
  //@{
    /**Create a new sound, using the parameters provided.
       It is expected that the "lowest common denominator" encoding, linear PCM,
       is used.

       All other values for the encoding are platform dependent.
     */
    PSound(
      unsigned numChannels = 1,    /// Number of channels eg mono/stereo
      unsigned sampleRate = 8000,  /// Samples per second
      unsigned bitsPerSample = 16, /// Number of bits per sample
      PINDEX   bufferSize = 0,     /// Size of data
      const BYTE * data = NULL     /// Pointer to initial data
    );

    /**Create a new sound, reading from a platform dependent file.
     */
    PSound(
      const PFilePath & filename   /// Sound file to load.
    );

    /**Set new data bytes for the sound.
     */
    PSound & operator=(
      const PBYTEArray & data  // New data for sound
    );
  //@}

  /**@name File functions */
  //@{
    /**Load a platform dependent sound file (eg .WAV file for Win32) into the
       object. Note the whole file must able to be loaded into memory.

       Also note that not all possible files are playable by this library. No
       format conversions between file and driver are performed.

       @return
       TRUE if the sound is loaded successfully.
     */
    BOOL Load(
      const PFilePath & filename   /// Sound file to load.
    );

    /**Save a platform dependent sound file (eg .WAV file for Win32) from the
       object.

       @return
       TRUE if the sound is saved successfully.
     */
    BOOL Save(
      const PFilePath & filename   // Sound file to load.
    );
  //@}

  /**@name Access functions */
  //@{
    /// Play the sound on the default sound device.
    BOOL Play();

    /**Set the internal sound format to linear PCM at the specification in
       the parameters.
     */
    void SetFormat(
      unsigned numChannels,   // Number of channels eg mono/stereo
      unsigned sampleRate,    /// Samples per second
      unsigned bitsPerSample  /// Number of bits per sample
    );

    /**Get the current encoding. A value of 0 indicates linear PCM, any other
       value is platform dependent.
     */
00235     unsigned GetEncoding()   const { return encoding; }

    /// Get  the number of channels (mono/stereo) in the sound.
00238     unsigned GetChannels()   const { return numChannels; }

    /// Get the sample rate in samples per second.
00241     unsigned GetSampleRate() const { return sampleRate; }

    /// Get the sample size in bits per sample.
00244     unsigned GetSampleSize() const { return sampleSize; }

    /// Get the platform dependent error code from the last file load.
00247     DWORD    GetErrorCode()  const { return dwLastError; }

    /// Get the size of the platform dependent format info.
00250     PINDEX   GetFormatInfoSize()  const { return formatInfo.GetSize(); }

    /// Get pointer to the platform dependent format info.
00253     const void * GetFormatInfoData() const { return (const BYTE *)formatInfo; }
  //@}

  /**@name Miscellaneous functions */
  //@{
    /**Play a sound file to the default device. If the #wait#
       parameter is TRUE then the function does not return until the file has
       been played. If FALSE then the sound play is begun asynchronously and
       the function returns immediately.

       @return
       TRUE if the sound is playing or has played.
     */
    static BOOL PlayFile(
      const PFilePath & file, /// Sound file to play.
      BOOL wait = TRUE        /// Flag to play sound synchronously.
    );

    /// Play the "standard" warning beep for the platform.
    static void Beep();
  //@}

  protected:
    /// Format code
00277     unsigned   encoding;      
    /// Number of channels eg mono/stereo
00279     unsigned   numChannels;   
    /// Samples per second
00281     unsigned   sampleRate;    
    /// Number of bits per sample
00283     unsigned   sampleSize;    
    /// Last error code for Load()/Save() functions
00285     DWORD      dwLastError;   
    /// Full info on the format (platform dependent)
00287     PBYTEArray formatInfo;    
};


/**
   This class is both an abstract class for a generalised sound channel, 
   and an implementation of PSoundChannel for old code that is not plugin-aware.
   When instantiated, it selects the first plugin of the base class "PSoundChannel"

   As an abstract class, this represents a sound schannel. Drivers for real, platform
   dependent sound hardware will be ancestors of this class and can be found
   in the plugins section of PWLib.

   A sound driver is either playing or recording. If simultaneous playing and
   recording is desired, two instances of PSoundChannel must be created.

   The sound is buffered and the size and number of buffers should be set
   before playing/recording. Each call to Write() will use one buffer, so care
   needs to be taken not to use a large number of small writes but tailor the
   buffers to the size of each write you make.

   Similarly for reading, an entire buffer must be read before any of it is
   available to a Read() call. Note that once a buffer is filled you can read
   it a byte at a time if desired, but as soon as all the data in the buffer
   is used returned, the next read will wait until the entire next buffer is
   read from the hardware. So again, tailor the number and size of buffers to
   the application. To avoid being blocked until the buffer fills, you can use
   the StartRecording() function to initiate the buffer filling, and the
   IsRecordingBufferFull() function to determine when the Read() function will
   no longer block.

   Note that this sound channel is implicitly a linear PCM channel. No data
   conversion is performed on data to/from the channel.
 */
00321 class PSoundChannel : public PChannel
{
  PCLASSINFO(PSoundChannel, PChannel);

  public:
  /**@name Construction */
  //@{
    enum Directions {
      Recorder,
      Player
    };

    /// Create a sound channel.
    PSoundChannel();

    /** Create a sound channel.
        Create a reference to the sound drivers for the platform.
      */
    PSoundChannel(
      const PString & device,       /// Name of sound driver/device
      Directions dir,               /// Sound I/O direction
      unsigned numChannels = 1,     /// Number of channels eg mono/stereo
      unsigned sampleRate = 8000,   /// Samples per second
      unsigned bitsPerSample = 16   /// Number of bits per sample
    );
    // 

    virtual ~PSoundChannel();
    // Destroy and close the sound driver
  //@}

  /**@name Open functions */
  //@{
    /**
      Return names of all plugins that correspond to sound devices
     */
    static PStringList GetDriverNames(PPluginManager * pluginMgr = NULL);

    /**
      Return sound devices that correspond to the specified name
     */
    static PStringList GetDeviceNames(
         const PString &driverName,
         const PSoundChannel::Directions,
         PPluginManager * pluginMgr = NULL
    );

    /**
      Return sound channel object that correspond to the specified name
     */
    static PSoundChannel *CreateChannel (
      const PString &driverName,
      PPluginManager * pluginMgr = NULL
    );

    /**
      Return opened sound channel object that correspond to the specified name
     */
    static PSoundChannel * CreateOpenedChannel(
      const PString & driverName,
      const PString & deviceName,
      const PSoundChannel::Directions,
      unsigned numChannels = 1,
      unsigned sampleRate = 8000,
      unsigned bitsPerSample = 16
    );

    /**Get the name for the default sound devices/driver that is on this
       platform. Note that a named device may not necessarily do both
       playing and recording so the arrays returned with the #dir#
       parameter in each value is not necessarily the same.

       @return
       A platform dependent string for the sound player/recorder.
     */
    static PString GetDefaultDevice(
      Directions dir    // Sound I/O direction
    );

    /**Get the list of all devices name for the default sound devices/driver that is on this
       platform. Note that a named device may not necessarily do both
       playing and recording so the arrays returned with the #dir#
       parameter in each value is not necessarily the same.

       @return
       A platform dependent string for the sound player/recorder.
     */
    static PStringList GetDeviceNames(
      Directions dir    // Sound I/O direction
    );

    /**Open the specified device for playing or recording. The device name is
       platform specific and is as returned in the GetDevices() function.

       @return
       TRUE if the sound device is valid for playing/recording.
     */
    virtual BOOL Open(
      const PString & device,       /// Name of sound driver/device
      Directions dir,               /// Sound I/O direction
      unsigned numChannels = 1,     /// Number of channels eg mono/stereo
      unsigned sampleRate = 8000,   /// Samples per second
      unsigned bitsPerSample = 16   /// Number of bits per sample
    );

    /**Test if this instance of PSoundChannel is open.

       @return
       TRUE if this instance is open.
     */
00431     virtual BOOL IsOpen() const
      { return (baseChannel == NULL) ? FALSE : baseChannel->PChannel::IsOpen(); }

    /**Get the OS specific handle for the PSoundChannel.

       @return
       integer value of the handle.
     */
00439     virtual int GetHandle() const
      { return (baseChannel == NULL) ? -1 : baseChannel->PChannel::GetHandle(); }

    /**Abort the background playing/recording of the sound channel.

       @return
       TRUE if the sound has successfully been aborted.
     */
00447     virtual BOOL Abort()
    { return (baseChannel == NULL) ? FALSE : baseChannel->Abort(); }
  //@}

  /**@name Channel set up functions */
  //@{
    /**Set the format for play/record. Note that linear PCM data is the only
       one supported at this time.

       Note that if the PlayFile() function is used, this may be overridden
       by information in the file being played.

       @return
       TRUE if the format is valid.
     */
00462     virtual BOOL SetFormat(
      unsigned numChannels = 1,     /// Number of channels eg mono/stereo
      unsigned sampleRate = 8000,   /// Samples per second
      unsigned bitsPerSample = 16   /// Number of bits per sample
    )
    { return (baseChannel == NULL) ? FALSE : baseChannel->SetFormat(numChannels, sampleRate, bitsPerSample); }

    /// Get  the number of channels (mono/stereo) in the sound.
00470     virtual unsigned GetChannels()   const
    { return (baseChannel == NULL) ? 0 : baseChannel->GetChannels(); }

    /// Get the sample rate in samples per second.
00474     virtual unsigned GetSampleRate() const
    { return (baseChannel == NULL) ? 0 : baseChannel->GetSampleRate(); }

    /// Get the sample size in bits per sample.
00478     virtual unsigned GetSampleSize() const 
    { return (baseChannel == NULL) ? 0 : baseChannel->GetSampleSize(); }

    /**Set the internal buffers for the sound channel I/O.

       Note that with Linux OSS, the size is always rounded up to the nearest
       power of two, so 20000 => 32768.

       @return
       TRUE if the sound device is valid for playing/recording.
     */
00489     virtual BOOL SetBuffers(
      PINDEX size,      /// Size of each buffer
      PINDEX count = 2  /// Number of buffers
    )
    { return (baseChannel == NULL) ? FALSE : baseChannel->SetBuffers(size, count); }

    /**Get the internal buffers for the sound channel I/O. 

       @return
       TRUE if the buffer size were obtained.
     */
00500     virtual BOOL GetBuffers(
      PINDEX & size,    // Size of each buffer
      PINDEX & count    // Number of buffers
    )
    { return (baseChannel == NULL) ? FALSE : baseChannel->GetBuffers(size, count); }

    enum {
      MaxVolume = 100
    };

    /**Set the volume of the play/read process.
       The volume range is 0 == quiet.  100 == LOUD.
        
       @return
       TRUE if there were no errors.
    */
00516     virtual BOOL SetVolume(
      unsigned volume   /// New volume level
    )
    { return (baseChannel == NULL) ? FALSE : baseChannel->SetVolume(volume); }

    /**Get the volume of the play/read process.
       The volume range is 0 == quiet.  100 == LOUD.

       @return
       TRUE if there were no errors.
    */
00527     virtual BOOL GetVolume(
      unsigned & volume   /// Variable to receive volume level.
    )
    { return (baseChannel == NULL) ? FALSE : baseChannel->GetVolume(volume); }
  //@}

  /**@name Play functions */
  //@{

    /** Low level write (or play) to the channel. This function will block until the
       requested number of characters are written or the write timeout is
       reached. The GetLastWriteCount() function returns the actual number
       of bytes written.
                                                                                                                                            
       The GetErrorCode() function should be consulted after Write() returns
       FALSE to determine what caused the failure.
 
       @return
       TRUE if at least len bytes were written to the channel.
     */
00547      virtual BOOL Write(const void * buf, PINDEX len)
      { return (baseChannel == NULL) ? FALSE : baseChannel->Write(buf, len); }

00550     PINDEX GetLastWriteCount() const
    { return (baseChannel == NULL) ? lastWriteCount : baseChannel->GetLastWriteCount(); }

    /**Play a sound to the open device. If the #wait# parameter is
       TRUE then the function does not return until the file has been played.
       If FALSE then the sound play is begun asynchronously and the function
       returns immediately.

       Note if the driver is closed of the object destroyed then the sound
       play is aborted.

       Also note that not all possible sounds and sound files are playable by
       this library. No format conversions between sound object and driver are
       performed.

       @return
       TRUE if the sound is playing or has played.
     */

00569     virtual BOOL PlaySound(
      const PSound & sound,   /// Sound to play.
      BOOL wait = TRUE        /// Flag to play sound synchronously.
    )
    { return (baseChannel == NULL) ? FALSE : baseChannel->PlaySound(sound, wait); }
    /**Play a sound file to the open device. If the #wait#
       parameter is TRUE then the function does not return until the file has
       been played. If FALSE then the sound play is begun asynchronously and
       the function returns immediately.

       Note if the driver is closed of the object destroyed then the sound
       play is aborted.

       Also note that not all possible sounds and sound files are playable by
       this library. No format conversions between sound object and driver are
       performed.

       @return
       TRUE if the sound is playing or has played.
     */
00589     virtual BOOL PlayFile(
      const PFilePath & file, /// Sound file to play.
      BOOL wait = TRUE        /// Flag to play sound synchronously.
    )
    { return (baseChannel == NULL) ? FALSE : baseChannel->PlayFile(file, wait); }

    /**Indicate if the sound play begun with PlayBuffer() or PlayFile() has
       completed.

       @return
       TRUE if the sound has completed playing.
     */
00601     virtual BOOL HasPlayCompleted()
    { return (baseChannel == NULL) ? FALSE : baseChannel->HasPlayCompleted(); }

    /**Block the thread until the sound play begun with PlayBuffer() or
       PlayFile() has completed.

       @return
       TRUE if the sound has successfully completed playing.
     */
00610     virtual BOOL WaitForPlayCompletion() 
    { return (baseChannel == NULL) ? FALSE : baseChannel->WaitForPlayCompletion(); }

  //@}

  /**@name Record functions */
  //@{
    /** Low level read from the channel. This function may block until the
       requested number of characters were read or the read timeout was
       reached. The GetLastReadCount() function returns the actual number
       of bytes read.

       The GetErrorCode() function should be consulted after Read() returns
       FALSE to determine what caused the failure.

       @return
       TRUE indicates that at least one character was read from the channel.
       FALSE means no bytes were read due to timeout or some other I/O error.
     */
00629     virtual BOOL Read(
      void * buf,   /// Pointer to a block of memory to receive the read bytes.
      PINDEX len    /// Maximum number of bytes to read into the buffer.
    )
    { return (baseChannel == NULL) ? FALSE : baseChannel->Read(buf, len); }

00635     PINDEX GetLastReadCount() const
    { return (baseChannel == NULL) ? lastReadCount : baseChannel->GetLastReadCount(); }

    /**Record into the sound object all of the buffer's of sound data. Use the
       SetBuffers() function to determine how long the recording will be made.

       For the Win32 platform, the most efficient way to record a PSound is to
       use the SetBuffers() function to set a single buffer of the desired
       size and then do the recording. For Linux OSS this can cause problems
       as the buffers are rounded up to a power of two, so to gain more
       accuracy you need a number of smaller buffers.

       Note that this function will block until all of the data is buffered.
       If you wish to do this asynchronously, use StartRecording() and
       AreAllrecordBuffersFull() to determine when you can call RecordSound()
       without blocking.

       @return
       TRUE if the sound has been recorded.
     */
00655     virtual BOOL RecordSound(
      PSound & sound /// Sound recorded
    )
    { return (baseChannel == NULL) ? FALSE : baseChannel->RecordSound(sound); }

    /**Record into the platform dependent sound file all of the buffer's of
       sound data. Use the SetBuffers() function to determine how long the
       recording will be made.

       Note that this function will block until all of the data is buffered.
       If you wish to do this asynchronously, use StartRecording() and
       AreAllrecordBuffersFull() to determine when you can call RecordSound()
       without blocking.

       @return
       TRUE if the sound has been recorded.
     */
00672     virtual BOOL RecordFile(
      const PFilePath & file /// Sound file recorded
    )
    { return (baseChannel == NULL) ? FALSE : baseChannel->RecordFile(file); }

    /**Start filling record buffers. The first call to Read() will also
       initiate the recording.

       @return
       TRUE if the sound driver has successfully started recording.
     */
00683     virtual BOOL StartRecording()
    { return (baseChannel == NULL) ? FALSE : baseChannel->StartRecording(); }

    /**Determine if a record buffer has been filled, so that the next Read()
       call will not block. Provided that the amount of data read is less than
       the buffer size.

       @return
       TRUE if the sound driver has filled a buffer.
     */
00693     virtual BOOL IsRecordBufferFull() 
    { return (baseChannel == NULL) ? FALSE : baseChannel->IsRecordBufferFull(); }

    /**Determine if all of the record buffer allocated has been filled. There
       is an implicit Abort() of the recording if this occurs and recording is
       stopped. The channel may need to be closed and opened again to start
       a new recording.

       @return
       TRUE if the sound driver has filled a buffer.
     */
00704     virtual BOOL AreAllRecordBuffersFull() 
    { return (baseChannel == NULL) ? FALSE : baseChannel->AreAllRecordBuffersFull(); }

    /**Block the thread until a record buffer has been filled, so that the
       next Read() call will not block. Provided that the amount of data read
       is less than the buffer size.

       @return
       TRUE if the sound driver has filled a buffer.
     */
00714     virtual BOOL WaitForRecordBufferFull() 
    { return (baseChannel == NULL) ? FALSE : baseChannel->WaitForRecordBufferFull() ; }

    /**Block the thread until all of the record buffer allocated has been
       filled. There is an implicit Abort() of the recording if this occurs
       and recording is stopped. The channel may need to be closed and opened
       again to start a new recording.

       @return
       TRUE if the sound driver has filled a buffer.
     */
00725     virtual BOOL WaitForAllRecordBuffersFull() 
    { return (baseChannel == NULL) ? FALSE : baseChannel->WaitForAllRecordBuffersFull() ; }
  //@}

  protected:
    PSoundChannel * baseChannel;
};


/////////////////////////////////////////////////////////////////////////

// define the sound plugin service descriptor

class PSoundChannelPluginServiceDescriptor : public PPluginServiceDescriptor 
{
  public:
    PSoundChannelPluginServiceDescriptor(
                     unsigned (*_GetVersion)(),
               PSoundChannel *(*_CreateInstance)(),
                 PStringArray (*_GetDeviceNames)(PSoundChannel::Directions)
     )
    : PPluginServiceDescriptor(_GetVersion),
      CreateInstance(_CreateInstance),
      GetDeviceNames(_GetDeviceNames)
    { }

    PSoundChannel *(*CreateInstance)();
    PStringArray (*GetDeviceNames) (PSoundChannel::Directions);
};


#define PCREATE_SOUND_SERVICE_DESCRIPTOR(className, versionFn) \
PSoundChannel * className##_CreateInstance () \
{ \
  return new className; \
} \
\
PStringArray className##_GetDeviceNames (PSoundChannel::Directions dir) \
{ \
  return className::GetDeviceNames(dir); \
} \
\
PSoundChannelPluginServiceDescriptor className##_descriptor(\
   versionFn, \
   className##_CreateInstance, \
   className##_GetDeviceNames \
); \

#define PCREATE_SOUND_PLUGIN(name, className) \
PCREATE_PLUGIN_VERSION_FN(name, PSoundChannel) \
PCREATE_SOUND_SERVICE_DESCRIPTOR(className, PPLUGIN_VERSION_FN(name, PSoundChannel)) \
PCREATE_PLUGIN(name, PSoundChannel, &className##_descriptor)

#endif

// End Of File ///////////////////////////////////////////////////////////////

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