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saud_channel.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2004 The ScummVM project
 *
 * 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.
 *
 * $Header: /cvsroot/scummvm/scummvm/scumm/smush/saud_channel.cpp,v 1.26 2004/02/14 01:39:09 kirben Exp $
 *
 */

#include "stdafx.h"

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

namespace Scumm {

void SaudChannel::handleStrk(Chunk &b) {
      int32 size = b.getSize();
      if (size != 14 && size != 10) {
            error("STRK has a invalid size : %d", size);
      }
}

void SaudChannel::handleSmrk(Chunk &b) {
      _markReached = true;
}

void SaudChannel::handleShdr(Chunk &b) {
      int32 size = b.getSize();
      if (size != 4)
            warning("SMRK has a invalid size : %d", size);
}

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 TYPE_STRK:
                  _inData = false;
                  if (available_size >= (size + 8)) {
                        MemoryChunk c((byte *)_tbuffer + offset);
                        handleStrk(c);
                  } else
                        return false;
                  break;
            case TYPE_SMRK:
                  _inData = false;
                  if (available_size >= (size + 8)) {
                        MemoryChunk c((byte *)_tbuffer + offset);
                        handleSmrk(c);
                  } else
                        return false;
                  break;
            case TYPE_SHDR:
                  _inData = false;
                  if (available_size >= (size + 8)) {
                        MemoryChunk c((byte *)_tbuffer + offset);
                        handleShdr(c);
                  } else
                        return false;
                  break;
            case TYPE_SDAT:
                  _inData = true;
                  _dataSize = size;
                  offset += 8;
                  return false;
            default:
                  error("unknown Chunk in SAUD track : %s ", Chunk::ChunkString(type));
            }
            offset += size + 8;
            return true;
      }
      return false;
}

bool SaudChannel::processBuffer() {
      assert(_tbuffer != 0);
      assert(_tbufferSize != 0);
      assert(_sbuffer == 0);
      assert(_sbufferSize == 0);
      
      if (_keepSize) {
            _sbufferSize = _tbufferSize;
            _sbuffer = _tbuffer;
            _tbufferSize = 0;
            _tbuffer = 0;
      } else if (_inData) {
            if (_dataSize < _tbufferSize) {
                  int32 offset = _dataSize;
                  while (handleSubTags(offset)) ;
                  _sbufferSize = _dataSize;
                  _sbuffer = _tbuffer;
                  if (offset < _tbufferSize) {
                        int new_size = _tbufferSize - offset;
                        _tbuffer = new byte[new_size];
                        if (!_tbuffer)
                              error("SaudChannel failed to allocate memory");
                        memcpy(_tbuffer, _sbuffer + offset, new_size);
                        _tbufferSize = new_size;
                  } else {
                        _tbuffer = 0;
                        _tbufferSize = 0;
                  }
                  if (_sbufferSize == 0) {
                        delete []_sbuffer; 
                        _sbuffer = 0;
                  }
            } else {
                  _sbufferSize = _tbufferSize;
                  _sbuffer = _tbuffer;
                  _tbufferSize = 0;
                  _tbuffer = 0;
            }
      } else {
            int32 offset = 0;
            while (handleSubTags(offset));
            if (_inData) {
                  _sbufferSize = _tbufferSize - offset;
                  assert(_sbufferSize);
                  _sbuffer = new byte[_sbufferSize];
                  if (!_sbuffer)
                        error("saud_channel failed to allocate memory");
                  memcpy(_sbuffer, _tbuffer + offset, _sbufferSize);
                  delete []_tbuffer;
                  _tbuffer = 0;
                  _tbufferSize = 0;
            } else {
                  if (offset) {
                        byte *old = _tbuffer;
                        int32 new_size = _tbufferSize - offset;
                        _tbuffer = new byte[new_size];
                        if (!_tbuffer)
                              error("SaudChannel failed to allocate memory");
                        memcpy(_tbuffer, old + offset, new_size);
                        _tbufferSize = new_size;
                        delete []old;
                  }
            }
      }
      return true;
}

SaudChannel::SaudChannel(int32 track, int32 freq) : 
      _track(track), 
      _nbframes(0),
      _dataSize(-1),
      _frequency(freq),
      _inData(false),
      _markReached(false),
      _index(0),
      _tbuffer(0),
      _tbufferSize(0),
      _sbuffer(0),
      _sbufferSize(0),
      _keepSize(false) {
}

SaudChannel::~SaudChannel() {
      _dataSize = 0;
      _tbufferSize = 0;
      _sbufferSize = 0;
      _markReached = true;
      if (_tbuffer)
            delete []_tbuffer;
      if (_sbuffer) {
            // _sbuffer can be not empty here with insane when it seeks in video
            delete []_sbuffer;
      }
      _sbuffer = 0;
}

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

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.getDword();
            saud_type = SWAP_BYTES_32(saud_type);
            uint32 saud_size = b.getDword();
            saud_size = SWAP_BYTES_32(saud_size);
            if (saud_type != TYPE_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);
      }
      return processBuffer();
}

int32 SaudChannel::availableSoundData(void) const {
      return _sbufferSize;
}

void SaudChannel::getSoundData(int16 *snd, int32 size) {
      for (int32 i = 0; i < size; i++) {
            snd[2 * i] = TO_LE_16(_sbuffer[i] ^ 0x80);
            snd[2 * i + 1] = TO_LE_16(_sbuffer[i] ^ 0x80);
      }
      if (!_keepSize)
            _dataSize -= size;
      delete []_sbuffer;
      _sbuffer = 0;
      _sbufferSize = 0;
}

} // End of namespace Scumm

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