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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2003 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 AUDIOSTREAM_H
#define AUDIOSTREAM_H
#include "scummsys.h"
#include <assert.h>
// TODO:
// * maybe make readIntern return 16.16 or 24.8 fixed point values
// since MAD (and maybe OggVorbis?) gives us those -> higher quality.
// The rate converters should be able to deal with those just fine, too.
// * possibly add MADInputStream and VorbisInputStream
/**
* Generic input stream for the resampling code.
*/
class AudioInputStream {
protected:
virtual int16 readIntern() = 0;
virtual void advance() = 0;
public:
int16 read() { assert(size() > 0); int16 val = readIntern(); advance(); return val; }
// int16 peek() { assert(size() > 0); return readIntern(); }
virtual int size() const = 0;
bool eof() const { return size() <= 0; }
virtual bool isStereo() const = 0;
};
class ZeroInputStream : public AudioInputStream {
protected:
int _len;
int16 readIntern() { return 0; }
void advance() { _len--; }
public:
ZeroInputStream(uint len) : _len(len) { }
virtual int size() const { return _len; }
virtual bool isStereo() const { return false; }
};
AudioInputStream *makeInputStream(byte _flags, const byte *ptr, uint32 len);
#endif
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