playthread.cc

/*
 * SubTimer source file
 *  Copyright (C) 2005 Peter Salvi
 *   Last modification: <2005.03.23., 16:16:43>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <qapplication.h>
#include <qmessagebox.h>

#include "playthread.hh"

#include <iostream>

void PlayThread::run()
{
  int res;
  char *offs = data;

  stop_now = false;

  if(format.access == SND_PCM_ACCESS_RW_INTERLEAVED)
    while(!stop_now && datasize > 0) {
      int frames = snd_pcm_bytes_to_frames(pcm_handle, datasize);
      res = snd_pcm_writei(pcm_handle, offs, frames); 
      if(res > 0) {
        int written = snd_pcm_frames_to_bytes(pcm_handle, res);
        datasize -= written;
        offs += written;
      }
      else if(res < 0) {
        QMessageBox::critical(parent, tr("Cannot write to PCM device"),
                              tr("Cannot write to the PCM device!"), 
                              QMessageBox::Cancel, QMessageBox::NoButton);
        break;
      }

#ifdef WHITE_LINE
      long delay;
      if(snd_pcm_delay(pcm_handle, &delay) < 0) {
        QMessageBox::critical(parent, tr("Cannot get PCM delay"),
                              tr("Cannot get the delay of the PCM stream!"), 
                              QMessageBox::Cancel, QMessageBox::NoButton);
        break;
      }
      if(pos_lock->tryLock()) {
        *play_position = (double)(offs - data - delay * multiply) / 
          (double)datasize;
        pos_lock->unlock();
      }
#endif // WHITE_LINE
    }
  else {
    // todo
  }

  if(stop_now) {
    if(snd_pcm_drop(pcm_handle) < 0) {
      QMessageBox::critical(parent, tr("Cannot stop PCM playback"),
                            tr("Cannot stop the PCM playback!"), 
                            QMessageBox::Cancel, QMessageBox::NoButton);
    }
  } else {

#ifdef WHITE_LINE
      long delay = 1;
      while(delay > 0) {
        if(snd_pcm_delay(pcm_handle, &delay) < 0) {
          QMessageBox::critical(parent, tr("Cannot get PCM delay"),
                                tr("Cannot get the delay of the PCM stream!"), 
                                QMessageBox::Cancel, QMessageBox::NoButton);
          break;
        }
        if(pos_lock->tryLock()) {
          *play_position = (double)(offs - data - delay * multiply) / 
            (double)datasize;
          pos_lock->unlock();
        }
      }
#endif // WHITE_LINE

    if(snd_pcm_drain(pcm_handle) < 0) {
      QMessageBox::critical(parent, tr("Cannot stop PCM playback"),
                            tr("Cannot stop the PCM playback!"), 
                            QMessageBox::Cancel, QMessageBox::NoButton);
    }
  }

  if(snd_pcm_close(pcm_handle) < 0) {
    QMessageBox::critical(parent, tr("Cannot close PCM device"),
                          tr("Cannot close the PCM device!"), 
                          QMessageBox::Cancel, QMessageBox::NoButton);
  }

  QApplication::postEvent(parent, new QCustomEvent(Finished));
}

void PlayThread::initThread(QWidget *obj, snd_pcm_t *handle, 
                            QMutex *mutex, double *playpos)
{
  parent = obj;
  pcm_handle = handle;
  pos_lock = mutex;
  play_position = playpos;
}

void PlayThread::loadData(char *ptr, size_t size, WaveFormat f)
{
  data = ptr;
  datasize = size;
  format = f;
}

void PlayThread::customEvent(QCustomEvent *e)
{
  if(e->type() == (QEvent::Type)Stop)
    stop_now = true;
}

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