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saud_channel.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/saud_channel.cpp $
 * $Id: saud_channel.cpp 30944 2008-02-23 22:50:18Z sev $
 *
 */


#include "common/endian.h"

#include "scumm/util.h"
#include "scumm/smush/channel.h"
#include "scumm/smush/chunk.h"

namespace Scumm {

SaudChannel::SaudChannel(int32 track) : SmushChannel(track),
      _nbframes(0),
      _markReached(false),
      _index(0),
      _keepSize(false) {
}

bool SaudChannel::isTerminated() const {
      return (_markReached && _dataSize == 0 && _sbuffer == 0);
}

bool SaudChannel::handleSubTags(int32 &offset) {
      if (_tbufferSize - offset >= 8) {
            Chunk::type type = READ_BE_UINT32(_tbuffer + offset);
            uint32 size = READ_BE_UINT32(_tbuffer + offset + 4);
            uint32 available_size = _tbufferSize - offset;

            switch (type) {
            case MKID_BE('STRK'):
                  _inData = false;
                  if (available_size >= (size + 8)) {
                        MemoryChunk c((byte *)_tbuffer + offset);
                        if (c.size() != 14 && c.size() != 10) {
                              error("STRK has an invalid size : %d", c.size());
                        }
                  } else
                        return false;
                  break;
            case MKID_BE('SMRK'):
                  _inData = false;
                  if (available_size >= (size + 8)) {
                        MemoryChunk c((byte *)_tbuffer + offset);
                        _markReached = true;
                  } else
                        return false;
                  break;
            case MKID_BE('SHDR'):
                  _inData = false;
                  if (available_size >= (size + 8)) {
                        MemoryChunk c((byte *)_tbuffer + offset);
                        if (c.size() != 4)
                              error("SHDR has an invalid size : %d", c.size());
                  } else
                        return false;
                  break;
            case MKID_BE('SDAT'):
                  _inData = true;
                  _dataSize = size;
                  offset += 8;
                  return false;
            default:
                  error("unknown Chunk in SAUD track : %s ", tag2str(type));
            }
            offset += size + 8;
            return true;
      }
      return false;
}

bool SaudChannel::setParameters(int32 nb, int32 flags, int32 volume, int32 pan, int32 index) {
      _nbframes = nb;
      _flags = flags; // bit 7 == IS_VOICE, bit 6 == IS_BACKGROUND_MUSIC, other ??
      _volume = volume;
      _pan = pan;
      _index = index;
      if (index != 0) {
            _dataSize = -2;
            _keepSize = true;
            _inData = true;
      }
      return true;
}

bool SaudChannel::checkParameters(int32 index, int32 nb, int32 flags, int32 volume, int32 pan) {
      if (++_index != index)
            error("invalid index in SaudChannel::checkParameters()");
      if (_nbframes != nb)
            error("invalid duration in SaudChannel::checkParameters()");
      if (_flags != flags)
            error("invalid flags in SaudChannel::checkParameters()");
      if (_volume != volume || _pan != pan) {
            _volume = volume;
            _pan = pan;
      }
      return true;
}

bool SaudChannel::appendData(Chunk &b, int32 size) {
      if (_dataSize == -1) {
            assert(size > 8);
            Chunk::type saud_type = b.readUint32BE();
            /*uint32 saud_size =*/ b.readUint32BE();
            if (saud_type != MKID_BE('SAUD'))
                  error("Invalid Chunk for SaudChannel : %X", saud_type);
            size -= 8;
            _dataSize = -2;
      }
      if (_tbuffer) {
            byte *old = _tbuffer;
            _tbuffer = new byte[_tbufferSize + size];
            if (!_tbuffer)
                  error("saud_channel failed to allocate memory");
            memcpy(_tbuffer, old, _tbufferSize);
            delete []old;
            b.read(_tbuffer + _tbufferSize, size);
            _tbufferSize += size;
      } else {
            _tbufferSize = size;
            _tbuffer = new byte[_tbufferSize];
            if (!_tbuffer)
                  error("saud_channel failed to allocate memory");
            b.read(_tbuffer, _tbufferSize);
      }

      if (_keepSize) {
            _sbufferSize = _tbufferSize;
            _sbuffer = _tbuffer;
            _tbufferSize = 0;
            _tbuffer = 0;
      } else {
            processBuffer();
      }

      return true;
}

byte *SaudChannel::getSoundData() {
      byte *tmp = _sbuffer;

      if (!_keepSize) {
            assert(_dataSize > 0);
            _dataSize -= _sbufferSize;
      }

      _sbuffer = 0;
      _sbufferSize = 0;

      return tmp;
}

} // End of namespace Scumm

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