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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001/2002 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.
*
* $Header$
*
*/
#ifndef __CHANNEL_H_
#define __CHANNEL_H_
#include "config.h"
#ifdef DEBUG
# ifndef NO_DEBUG_CHANNEL
# define DEBUG_CHANNEL
# endif
#else
# ifdef DEBUG_CHANNEL
# error DEBUG_CHANNEL defined without DEBUG
# endif
#endif
class Chunk;
class ContChunk;
/*! @brief interface for a sound channel (a track)
This is the interface for sound channels.
*/
class _Channel {
public:
virtual ~_Channel() {};
// called by the smush_player
virtual bool appendData(Chunk & b, int size) = 0;
virtual bool setParameters(int, int, int, int) = 0;
virtual bool checkParameters(int, int, int, int, int) = 0;
// called by the mixer
virtual bool isTerminated() const = 0;
virtual int availableSoundData() const = 0;
virtual void getSoundData(short * sound_buffer, int size) = 0; // size is in sample
virtual void getSoundData(char * sound_buffer, int size) = 0;
virtual bool getParameters(int &rate, bool &stereo, bool &is_16bit) = 0;
virtual int getTrackIdentifier() const = 0;
};
class SaudChannel : public _Channel {
private:
int _track; //!< The track identifier
int _nbframes; //!< number of frames of the track (unused)
int _dataSize; //!< the size of the sound buffer
int _frequency; //!< the frequency target of the track (always 22050)
bool _inData; //!< are we processing data ?
bool _markReached; //!< set to \c true when the SMRK tag is reached
int _flags; //!< current flags of the track (unused)
int _volume; //!< the current track volume
int _balance; //!< the current track balance
int _index; //!< the current PSAD index (for coherency checking)
short _voltable[2][256]; //!< the precalculated volume table (stereo 16 bits)
unsigned char * _tbuffer; //!< data temporary buffer
int _tbufferSize; //!< temporary buffer size
unsigned char * _sbuffer; //!< sound buffer
int _sbufferSize; //!< sound buffer size
protected:
void handleStrk(Chunk & c);
void handleSmrk(Chunk & c);
void handleShdr(Chunk & c);
bool handleSubTags(int & offset);
bool processBuffer();
void recalcVolumeTable();
public:
SaudChannel(int track, int freq);
virtual ~SaudChannel();
bool isTerminated() const;
bool setParameters(int duration, int flags, int vol1, int vol2);
bool checkParameters(int index, int duration, int flags, int vol1, int vol2);
bool appendData(Chunk & b, int size);
int availableSoundData() const;
void getSoundData(short * sound_buffer, int size);
void getSoundData(char * sound_buffer, int size) { error("16bit request for SAUD channel should never happen"); };
bool getParameters(int &rate, bool &stereo, bool &is_16bit) {
rate = _frequency;
stereo = true;
is_16bit = true;
return true;
};
virtual int getTrackIdentifier() const { return _track; };
};
/*! @brief class for a IACT sound ::channel (a The Dig track)
This class implements a channel specifically for The Dig.
\bug for unknown reason, some sound have a too long duration, or repeat themselves.
*/
class ImuseChannel : public _Channel {
private:
int _track; //!< the track number
unsigned char * _tbuffer; //!< data temporary buffer
int _tbufferSize; //!< temporary buffer size
unsigned char * _sbuffer; //!< sound buffer
int _sbufferSize; //!< sound buffer size
int _srbufferSize;
int _frequency; //!< the target frequency of the ::mixer
int _dataSize; //!< remaining size of sound data in the iMUS buffer
bool _inData;
int _bitsize; //!< the bitsize of the original data
int _rate; //!< the sampling rate of the original data
int _channels; //!< the number of channels of the original data
protected:
int decode(int size, int &ret);
void decode();
bool processBuffer();
bool handleMap(Chunk &);
bool handleFormat(Chunk &);
bool handleText(Chunk &);
bool handleRegion(Chunk &);
bool handleStop(Chunk &);
bool handleSubTags(int & offset);
public:
ImuseChannel(int track, int freq);
virtual ~ImuseChannel();
bool isTerminated() const;
bool setParameters(int nbframes, int size, int unk1, int unk2);
bool checkParameters(int index, int nbframes, int size, int unk1, int unk2);
bool appendData(Chunk & b, int size);
int availableSoundData() const;
void getSoundData(short * sound_buffer, int size);
void getSoundData(char * sound_buffer, int size);
bool getParameters(int &rate, bool &stereo, bool &is_16bit) {
rate = _frequency;
stereo = (_channels == 2);
is_16bit = (_bitsize > 8);
return true;
};
virtual int getTrackIdentifier() const { return _track; };
};
#endif
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