/*
 * audio.cxx
 *
 * Audio conferencing functions for a simple MCU
 *
 * Copyright (c) 2000 Equivalence Pty. Ltd.
 * Copyright (c) 2004 Post Increment
 *
 * 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 of this code were written by Post Increment (http://www.postincrement.com) 
 * with the assistance of funding from Citron Networks (http://www.citron.com.tw)
 *
 * Portions are Copyright (C) 1993 Free Software Foundation, Inc.
 * All Rights Reserved.
 *
 * Contributor(s): Derek J Smithies (derek@indranet.co.nz)
 *                 ------------------------------
 *
 * $Log: audio.cxx,v $
 * Revision 2.0  2004/03/08 02:06:24  csoutheren
 * Totally rewritten to use new connection locking mecahnism
 * Added ability to monitor conferences
 * Added initial support for H.323 MCU messages
 * Thanks to Citron Networks for supporting this work
 *
 */

#include <ptlib.h>
#include "main.h"

#define	MIN_HEADROOM	30
#define	MAX_HEADROOM	60

AudioDelay::AudioDelay()
{
  firstTime = TRUE;
  error = 0;
}

void AudioDelay::Restart()
{
  firstTime = TRUE;
}

BOOL AudioDelay::Delay(int frameTime)
{
  if (firstTime) {
    firstTime = FALSE;
    previousTime = PTime();
    return TRUE;
  }

  // add in the new delay
  error += frameTime;

  // remove the actual delay since the last call
  PTime now;
  PTimeInterval delay = now - previousTime;
  error -= (int)delay.GetMilliSeconds();
  previousTime = now;

  // if the delay is > 10 ms, then accumulate the error until next time
  if (error > 10) {
#ifdef P_LINUX
    usleep(error * 1000);
#else
    PThread::Current()->Sleep(error);
#endif
  }

  //return error <= -frameTime;
  return FALSE;
}