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61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001-2003 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#ifndef AUDIOSTREAM_H
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#define AUDIOSTREAM_H
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#include "scummsys.h"
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#include <assert.h>
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// TODO:
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// * maybe make readIntern return 16.16 or 24.8 fixed point values
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// since MAD (and maybe OggVorbis?) gives us those -> higher quality.
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// The rate converters should be able to deal with those just fine, too.
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// * possibly add MADInputStream and VorbisInputStream
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/**
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* Generic input stream for the resampling code.
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*/
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class AudioInputStream {
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protected:
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virtual int16 readIntern() = 0;
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virtual void advance() = 0;
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public:
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int16 read() { assert(size() > 0); int16 val = readIntern(); advance(); return val; }
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int16 peek() { assert(size() > 0); return readIntern(); }
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virtual int size() = 0;
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bool eof() { return size() <= 0; }
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};
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class ZeroInputStream : public AudioInputStream {
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protected:
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int _len;
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int16 readIntern() { return 0; }
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void advance() { _len--; }
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public:
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ZeroInputStream(uint len) : _len(len) { }
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virtual int size() { return _len; }
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};
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AudioInputStream *makeInputStream(byte _flags, const byte *ptr, uint32 len);
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#endif
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