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channel.h

/* 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/channel.h,v 1.17 2004/01/09 23:33:36 aquadran Exp $
 *
 */

#ifndef SMUSH_CHANNEL_H
#define SMUSH_CHANNEL_H

#include "common/util.h"

namespace Scumm {

class Chunk;
class ContChunk;
      
class SmushChannel {
public:

      virtual ~SmushChannel() {};
      virtual bool appendData(Chunk &b, int32 size) = 0;
      virtual bool setParameters(int32, int32, int32, int32, int32) = 0;
      virtual bool checkParameters(int32, int32, int32, int32, int32) = 0;
      virtual bool isTerminated() const = 0;
      virtual int32 availableSoundData() const = 0;
      virtual void getSoundData(int16 *sound_buffer, int32 size) = 0;
      virtual void getSoundData(int8 *sound_buffer, int32 size) = 0;
      virtual int32 getRate() = 0;
      virtual bool getParameters(int32 &rate, bool &stereo, bool &is_16bit, int32 &vol, int32 &pan) = 0;
      virtual int32 getTrackIdentifier() const = 0;
};

class SaudChannel : public SmushChannel {
private:
      int32 _track;
      int32 _nbframes;
      int32 _dataSize;
      int32 _frequency;
      bool _inData;
      bool _markReached;
      int32 _flags;
      int32 _volume;
      int32 _pan;
      int32 _index;
      byte *_tbuffer;
      int32 _tbufferSize;
      byte *_sbuffer;
      int32 _sbufferSize;
      bool _keepSize;

protected:
      void handleStrk(Chunk &c);
      void handleSmrk(Chunk &c);
      void handleShdr(Chunk &c);
      bool handleSubTags(int32 &offset);
      bool processBuffer();

public:
      SaudChannel(int32 track, int32 freq);
      virtual ~SaudChannel();
      bool isTerminated() const;
      bool setParameters(int32 duration, int32 flags, int32 vol1, int32 vol2, int32 index);
      bool checkParameters(int32 index, int32 duration, int32 flags, int32 vol1, int32 vol2);
      bool appendData(Chunk &b, int32 size);
      int32 availableSoundData() const;
      void getSoundData(int16 *sound_buffer, int32 size);
      void getSoundData(int8 *sound_buffer, int32 size) { error("8bit request for SAUD channel should never happen"); };
      int32 getRate() { return _frequency; }
      bool getParameters(int32 &rate, bool &stereo, bool &is_16bit, int32 &vol, int32 &pan) { 
            rate = _frequency;
            stereo = true;
            is_16bit = true;
            vol = _volume;
            pan = _pan;
            return true;
      };
      virtual int32 getTrackIdentifier() const { return _track; };
};

class ImuseChannel : public SmushChannel {
private:
      int32 _track;                       //!< the track number
      byte *_tbuffer;   //!< data temporary buffer
      int32 _tbufferSize;                 //!< temporary buffer size
      byte *_sbuffer;   //!< sound buffer
      int32 _sbufferSize;                 //!< sound buffer size
      int32 _srbufferSize;
      int32 _frequency;             //!< the target frequency of the ::mixer
      int32 _dataSize;              //!< remaining size of sound data in the iMUS buffer
      bool _inData;
      int32 _volume;
      int32 _pan;

      int32 _bitsize;               //!< the bitsize of the original data
      int32 _rate;                        //!< the sampling rate of the original data
      int32 _channels;              //!< the number of channels of the original data

protected:
      int32 decode(int32 size, int32 &ret);
      void decode();
      bool processBuffer();
      bool handleMap(Chunk &);
      bool handleFormat(Chunk &);
      bool handleText(Chunk &);
      bool handleRegion(Chunk &);
      bool handleStop(Chunk &);
      bool handleSubTags(int32 & offset);

public:
      ImuseChannel(int32 track, int32 freq);
      virtual ~ImuseChannel();
      bool isTerminated() const;
      bool setParameters(int32 nbframes, int32 size, int32 track_flags, int32 unk1, int32);
      bool checkParameters(int32 index, int32 nbframes, int32 size, int32 track_flags, int32 unk1);
      bool appendData(Chunk &b, int32 size);
      int32 availableSoundData() const;
      void getSoundData(int16 *sound_buffer, int32 size);
      void getSoundData(int8 *sound_buffer, int32 size);
      int32 getRate() { return _rate; }
      bool getParameters(int32 &rate, bool &stereo, bool &is_16bit, int32 &vol, int32 &pan) {
            rate = _rate;
            stereo = (_channels == 2);
            is_16bit = (_bitsize > 8);
            vol = _volume;
            pan = _pan;
            return true;
      };
      virtual int32 getTrackIdentifier() const { return _track; };
};

} // End of namespace Scumm

#endif

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