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smush_mixer.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/engines/scumm/smush/smush_mixer.cpp $
 * $Id: smush_mixer.cpp 30944 2008-02-23 22:50:18Z sev $
 *
 */


#include "common/util.h"

#include "scumm/smush/smush_mixer.h"
#include "scumm/smush/channel.h"
#include "scumm/scumm.h"
#include "scumm/sound.h"
#include "scumm/imuse/imuse.h"

#include "sound/mixer.h"


namespace Scumm {

SmushMixer::SmushMixer(Audio::Mixer *m) :
      _mixer(m),
      _soundFrequency(22050) {
      for (int32 i = 0; i < NUM_CHANNELS; i++) {
            _channels[i].id = -1;
            _channels[i].chan = NULL;
            _channels[i].stream = NULL;
      }
}

SmushMixer::~SmushMixer() {
      for (int32 i = 0; i < NUM_CHANNELS; i++) {
            _mixer->stopHandle(_channels[i].handle);
      }
}

SmushChannel *SmushMixer::findChannel(int32 track) {
      debugC(DEBUG_SMUSH, "SmushMixer::findChannel(%d)", track);
      for (int32 i = 0; i < NUM_CHANNELS; i++) {
            if (_channels[i].id == track)
                  return _channels[i].chan;
      }
      return NULL;
}

void SmushMixer::addChannel(SmushChannel *c) {
      int32 track = c->getTrackIdentifier();
      int i;

      debugC(DEBUG_SMUSH, "SmushMixer::addChannel(%d)", track);

      for (i = 0; i < NUM_CHANNELS; i++) {
            if (_channels[i].id == track)
                  debugC(DEBUG_SMUSH, "SmushMixer::addChannel(%d): channel already exists", track);
      }

      for (i = 0; i < NUM_CHANNELS; i++) {
            if ((_channels[i].chan == NULL || _channels[i].id == -1) && !_mixer->isSoundHandleActive(_channels[i].handle)) {
                  _channels[i].chan = c;
                  _channels[i].id = track;
                  return;
            }
      }

      for (i = 0; i < NUM_CHANNELS; i++) {
            debugC(DEBUG_SMUSH, "channel %d : %p(%d, %d)", i, (void *)_channels[i].chan,
                  _channels[i].chan ? _channels[i].chan->getTrackIdentifier() : -1,
                  _channels[i].chan ? _channels[i].chan->isTerminated() : 1);
      }

      error("SmushMixer::addChannel(%d): no channel available", track);
}

bool SmushMixer::handleFrame() {
      debugC(DEBUG_SMUSH, "SmushMixer::handleFrame()");
      for (int i = 0; i < NUM_CHANNELS; i++) {
            if (_channels[i].id != -1) {
                  if (_channels[i].chan->isTerminated()) {
                        delete _channels[i].chan;
                        _channels[i].id = -1;
                        _channels[i].chan = NULL;
                        if (_channels[i].stream) {
                              _channels[i].stream->finish();
                              _channels[i].stream = 0;
                        }
                  } else {
                        int32 vol, pan;
                        bool stereo, is_16bit;

                        _channels[i].chan->getParameters(stereo, is_16bit, vol, pan);

                        // Grab the audio data from the channel
                        int32 size = _channels[i].chan->getAvailableSoundDataSize();
                        byte *data = _channels[i].chan->getSoundData();

                        byte flags = stereo ? Audio::Mixer::FLAG_STEREO : 0;
                        if (is_16bit) {
                              flags |= Audio::Mixer::FLAG_16BITS;
                        } else {
                              flags |= Audio::Mixer::FLAG_UNSIGNED;
                        }

                        if (_mixer->isReady()) {
                              // Stream the data
                              if (!_channels[i].stream) {
                                    _channels[i].stream = Audio::makeAppendableAudioStream(_channels[i].chan->getRate(), flags);
                                    _mixer->playInputStream(Audio::Mixer::kSFXSoundType, &_channels[i].handle, _channels[i].stream);
                              }
                              _mixer->setChannelVolume(_channels[i].handle, vol);
                              _mixer->setChannelBalance(_channels[i].handle, pan);
                              _channels[i].stream->queueBuffer(data, size);   // The stream will free the buffer for us
                        } else
                              delete[] data;
                  }
            }
      }
      return true;
}

bool SmushMixer::stop() {
      debugC(DEBUG_SMUSH, "SmushMixer::stop()");
      for (int i = 0; i < NUM_CHANNELS; i++) {
            if (_channels[i].id != -1) {
                  delete _channels[i].chan;
                  _channels[i].id = -1;
                  _channels[i].chan = NULL;
                  if (_channels[i].stream) {
                        _channels[i].stream->finish();
                        _channels[i].stream = NULL;
                  }
            }
      }

      return true;
}

bool SmushMixer::flush() {
      debugC(DEBUG_SMUSH, "SmushMixer::flush()");
      for (int i = 0; i < NUM_CHANNELS; i++) {
            if (_channels[i].id != -1) {
                  if (_channels[i].stream->endOfStream()) {
                        _mixer->stopHandle(_channels[i].handle);
                        delete _channels[i].chan;
                        _channels[i].id = -1;
                        _channels[i].chan = NULL;
                        _channels[i].stream = NULL;
                  }
            }
      }

      return true;
}

} // End of namespace Scumm

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