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84 lines
2.1 KiB
C++
84 lines
2.1 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $Header$
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*
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*/
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#ifndef SOUND_RATE_H
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#define SOUND_RATE_H
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#include "common/scummsys.h"
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#include "base/engine.h"
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class AudioStream;
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namespace Audio {
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typedef int16 st_sample_t;
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typedef uint16 st_volume_t;
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typedef uint32 st_size_t;
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typedef uint32 st_rate_t;
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/* Minimum and maximum values a sample can hold. */
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#define ST_SAMPLE_MAX 0x7fffL
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#define ST_SAMPLE_MIN (-ST_SAMPLE_MAX - 1L)
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#define ST_EOF (-1)
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#define ST_SUCCESS (0)
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static inline void clampedAdd(int16& a, int b) {
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register int val;
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#ifdef OUTPUT_UNSIGNED_AUDIO
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val = (a ^ 0x8000) + b;
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#else
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val = a + b;
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#endif
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if (val > ST_SAMPLE_MAX)
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val = ST_SAMPLE_MAX;
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else if (val < ST_SAMPLE_MIN)
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val = ST_SAMPLE_MIN;
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#ifdef OUTPUT_UNSIGNED_AUDIO
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a = ((int16)val) ^ 0x8000;
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#else
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a = val;
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#endif
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}
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// Q&D hack to get this SOX stuff to work
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#define st_report warning
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#define st_warn warning
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#define st_fail error
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class RateConverter {
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public:
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RateConverter() {}
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virtual ~RateConverter() {}
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virtual int flow(AudioStream &input, st_sample_t *obuf, st_size_t osamp, st_volume_t vol_l, st_volume_t vol_r) = 0;
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virtual int drain(st_sample_t *obuf, st_size_t osamp, st_volume_t vol) = 0;
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};
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RateConverter *makeRateConverter(st_rate_t inrate, st_rate_t outrate, bool stereo, bool reverseStereo = false);
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} // End of namespace Audio
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#endif
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