sound/vag.h

   1 /* ScummVM - Graphic Adventure Engine
   2  *
   3  * ScummVM is the legal property of its developers, whose names
   4  * are too numerous to list here. Please refer to the COPYRIGHT
   5  * file distributed with this source distribution.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  *
  21  * $URL$
  22  * $Id$
  23  *
  24  */
  25
  26 /* Sound decoder used in engines:
  27  * sword1 (PSX port of the game)
  28  * sword2 (PSX port of the game)
  29  */
  30
  31 #ifndef SOUND_VAG_H
  32 #define SOUND_VAG_H
  33
  34 #include "sound/audiostream.h"
  35 #include "common/stream.h"
  36
  37 namespace Audio {
  38
  39 class VagStream : public Audio::AudioStream {
  40 public:
  41         VagStream(Common::SeekableReadStream *stream, bool loop = false, int rate = 11025);
  42         ~VagStream();
  43
  44         bool isStereo() const { return false; }
  45         bool endOfData() const { return _stream->pos() == _stream->size(); }
  46         int getRate() const { return _rate; }
  47         int readBuffer(int16 *buffer, const int numSamples);
  48         void rewind();
  49
  50 private:
  51         Common::SeekableReadStream *_stream;
  52
  53         bool _loop;
  54         byte _predictor;
  55         double _samples[28];
  56         byte _samplesRemaining;
  57         int _rate;
  58         double _s1, _s2;
  59 };
  60
  61 } // End of namespace Sword1
  62
  63 #endif