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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>
#ifdef USE_VORBIS
#include <vorbis/vorbisfile.h>
#endif
// 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 {
public:
virtual ~AudioInputStream() {}
virtual int16 read() = 0;
virtual int size() const = 0;
virtual bool isStereo() const = 0;
bool eof() const { return size() <= 0; }
};
class WrappedAudioInputStream : public AudioInputStream {
public:
virtual void append(const byte *data, uint32 len) = 0;
};
class ZeroInputStream : public AudioInputStream {
protected:
int _len;
public:
ZeroInputStream(uint len) : _len(len) { }
int16 read() { assert(_len > 0); _len--; return 0; }
int size() const { return _len; }
bool isStereo() const { return false; }
};
AudioInputStream *makeLinearInputStream(byte _flags, const byte *ptr, uint32 len);
WrappedAudioInputStream *makeWrappedInputStream(byte _flags, uint32 len);
#ifdef USE_VORBIS
class VorbisInputStream : public AudioInputStream {
OggVorbis_File *_ov_file;
int _end_pos;
bool _eof_flag;
int _channels;
int16 _buffer[4096];
int16 *_pos;
void refill();
public:
// TODO
VorbisInputStream(OggVorbis_File *file, int duration);
int16 read();
int size() const;
bool isStereo() const { return _channels >= 2; }
};
#endif
#endif
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