sound_esd.cxx

安装 H323需要的pwlib库

/*
 * esdaudio.cxx
 *
 * Sound driver implementation to use ESound.
 *
 * Portable Windows Library
 *
 * Copyright (c) 2001 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
 * Shawn Pai-Hsiang Hsiao <[e-mail]>
 *
 * All Rights Reserved.
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: sound_esd.cxx,v $
 * Revision 1.1  2003/11/14 05:51:39  csoutheren
 * Initial version
 *
 * Revision 1.11  2003/03/03 09:05:59  rogerh
 * Looks like a bug in the loopback Close code. Just document it for now.
 *
 * Revision 1.10  2003/02/20 08:56:55  rogerh
 * Updated code from Shawn following some Mac OS X and linux testing.
 *
 * Revision 1.9  2003/02/19 10:22:22  rogerh
 * Add ESD fix from Shawn Pai-Hsiang Hsiao <[e-mail]>
 *
 * Revision 1.8  2002/10/08 12:39:24  rogerh
 * Rearrange code to stop a type cast warning
 *
 * Revision 1.7  2002/02/26 21:19:55  rogerh
 * Return the correct number of bytes in the Read() method. This fixes
 * the bug where esound audio made you sound like a robot.
 *
 * Revision 1.6  2002/02/26 18:08:23  rogerh
 * Add dummy stubs for the volume settings
 *
 * Revision 1.5  2002/02/09 00:52:01  robertj
 * Slight adjustment to API and documentation for volume functions.
 *
 * Revision 1.4  2002/02/07 20:57:21  dereks
 * add SetVolume and GetVolume methods to PSoundChannel
 *
 * Revision 1.3  2002/01/28 08:01:06  rogerh
 * set lastReadCount during Reads
 *
 * Revision 1.2  2001/09/24 08:56:43  rogerh
 * Remove LastError, submitted by Andreas Wrede <[e-mail]>
 *
 * Revision 1.1  2001/07/19 09:27:12  rogerh
 * Add support for EsounD and esd (the Enlightenment Sound Daemon).
 * This allows OhPhone to run on platforms where EsounD and esd have been
 * ported which includes Mac OS X.
 * Code written by Shawn Pai-Hsiang Hsiao <[e-mail]>.
 *
 *
 */

#pragma implementation "sound.h"

#include <ptlib.h>
#include <esd.h>

#pragma implementation "sound_esd.h"

#include "sound_esd.h"

PCREATE_SOUND_PLUGIN(ESD, PSoundChannelESD);

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

PSoundChannelESD::PSoundChannelESD()
{
  Construct();
}


PSoundChannelESD::PSoundChannelESD(const PString & device,
                             Directions dir,
                             unsigned numChannels,
                             unsigned sampleRate,
                             unsigned bitsPerSample)
{
  Construct();
  Open(device, dir, numChannels, sampleRate, bitsPerSample);
}


void PSoundChannelESD::Construct()
{
}


PSoundChannelESD::~PSoundChannelESD()
{
  Close();
}


PStringArray PSoundChannelESD::GetDeviceNames(Directions /*dir*/)
{
  PStringArray array;

  array[0] = "ESound";

  return array;
}


PString PSoundChannelESD::GetDefaultDevice(Directions /*dir*/)
{
  return "ESound";
}

BOOL PSoundChannelESD::Open(const PString & device,
                         Directions dir,
                         unsigned numChannels,
                         unsigned sampleRate,
                         unsigned bitsPerSample)
{
  int bits, channels, rate, mode, func;
  esd_format_t format;
  char *host = NULL, *name = NULL;

  Close();

  // make sure we have proper bits per sample
  switch (bitsPerSample) {
  case 16:
    bits = ESD_BITS16;
    break;
  case 8:
    bits = ESD_BITS8;
    break;
  default:
    return (FALSE);
  }

  // make sure we have proper number of channels
  switch (numChannels) {
  case 2:
    channels = ESD_STEREO;
    break;
  case 1:
    channels = ESD_MONO;
    break;
  default:
    return (FALSE);
  }

  rate = sampleRate;
  mode = ESD_STREAM;

  // a separate stream for Player and Recorder
  switch (dir) {
  case Recorder:
    func = ESD_RECORD;
    break;
  case Player:
    func = ESD_PLAY;
    break;
  default:
    return (FALSE);
  }

  format = bits | channels | mode | func;
  if (dir == Recorder) 
    os_handle = esd_record_stream_fallback( format, rate, host, name );
  else
    os_handle = esd_play_stream_fallback( format, rate, host, name );

  if ( os_handle <= 0 ) 
    return (FALSE);

  return SetFormat(numChannels, sampleRate, bitsPerSample);
}

BOOL PSoundChannelESD::SetVolume(unsigned newVal)
{
  if (os_handle <= 0)  //Cannot set volume in loop back mode.
    return FALSE;
  
  return FALSE;
}

BOOL  PSoundChannelESD::GetVolume(unsigned &devVol)
{
  if (os_handle <= 0)  //Cannot get volume in loop back mode.
    return FALSE;
  
  devVol = 0;
  return FALSE;
}
  


BOOL PSoundChannelESD::Close()
{
  /* I think there is a bug here. We should be testing for loopback mode
   * and NOT calling PChannel::Close() when we are in loopback mode.
   * (otherwise we close file handle 0 which is stdin)
   */

  return PChannel::Close();
}


BOOL PSoundChannelESD::SetFormat(unsigned numChannels,
                              unsigned sampleRate,
                              unsigned bitsPerSample)
{
  PAssert(numChannels >= 1 && numChannels <= 2, PInvalidParameter);
  PAssert(bitsPerSample == 8 || bitsPerSample == 16, PInvalidParameter);

  return TRUE;
}


BOOL PSoundChannelESD::SetBuffers(PINDEX size, PINDEX count)
{
  Abort();

  PAssert(size > 0 && count > 0 && count < 65536, PInvalidParameter);

  return TRUE;
}


BOOL PSoundChannelESD::GetBuffers(PINDEX & size, PINDEX & count)
{
  return TRUE;
}


BOOL PSoundChannelESD::Write(const void * buf, PINDEX len)
{
  int rval;

  if (os_handle >= 0) {

    // Sends data to esd.
    rval = ::write(os_handle, buf, len);
    if (rval > 0) {
#if defined(P_MACOSX)
      // Mac OS X's esd has a big input buffer so we need to simulate
      // writing data out at the correct rate.
      writeDelay.Delay(len/16);
#endif
      return (TRUE);
    }
  }

  return FALSE;
}


BOOL PSoundChannelESD::PlaySound(const PSound & sound, BOOL wait)
{
  Abort();

  if (!Write((const BYTE *)sound, sound.GetSize()))
    return FALSE;

  if (wait)
    return WaitForPlayCompletion();

  return TRUE;
}


BOOL PSoundChannelESD::PlayFile(const PFilePath & filename, BOOL wait)
{
  return TRUE;
}


BOOL PSoundChannelESD::HasPlayCompleted()
{
  return FALSE;
}


BOOL PSoundChannelESD::WaitForPlayCompletion()
{
  return TRUE;
}


BOOL PSoundChannelESD::Read(void * buf, PINDEX len)
{
  if (os_handle < 0) 
    return FALSE;

  lastReadCount = 0;
  // keep looping until we have read 'len' bytes
  while (lastReadCount < len) {
    int retval = ::read(os_handle, ((char *)buf)+lastReadCount, len-lastReadCount);
    if (retval <= 0) return FALSE;
    lastReadCount += retval;
  }
  return (TRUE);
}


BOOL PSoundChannelESD::RecordSound(PSound & sound)
{
  return TRUE;
}


BOOL PSoundChannelESD::RecordFile(const PFilePath & filename)
{
  return TRUE;
}


BOOL PSoundChannelESD::StartRecording()
{
  return (TRUE);
}


BOOL PSoundChannelESD::IsRecordBufferFull()
{
  return (TRUE);
}


BOOL PSoundChannelESD::AreAllRecordBuffersFull()
{
  return TRUE;
}


BOOL PSoundChannelESD::WaitForRecordBufferFull()
{
  if (os_handle < 0) {
    return FALSE;
  }

  return PXSetIOBlock(PXReadBlock, readTimeout);
}


BOOL PSoundChannelESD::WaitForAllRecordBuffersFull()
{
  return FALSE;
}


BOOL PSoundChannelESD::Abort()
{
  return TRUE;
}


// End of file