mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-23 10:19:27 +00:00
91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
|
|
*
|
|
* ScummVM is the legal property of its developers, whose names
|
|
* are too numerous to list here. Please refer to the COPYRIGHT
|
|
* file distributed with this source distribution.
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
* $URL$
|
|
* $Id$
|
|
*
|
|
*/
|
|
|
|
#ifndef SOUND_RATE_H
|
|
#define SOUND_RATE_H
|
|
|
|
#include "common/scummsys.h"
|
|
#include "engines/engine.h"
|
|
|
|
class AudioStream;
|
|
|
|
|
|
namespace Audio {
|
|
|
|
typedef int16 st_sample_t;
|
|
typedef uint16 st_volume_t;
|
|
typedef uint32 st_size_t;
|
|
typedef uint32 st_rate_t;
|
|
|
|
/* Minimum and maximum values a sample can hold. */
|
|
enum {
|
|
ST_SAMPLE_MAX = 0x7fffL,
|
|
ST_SAMPLE_MIN = (-ST_SAMPLE_MAX - 1L)
|
|
};
|
|
|
|
enum {
|
|
ST_EOF = -1,
|
|
ST_SUCCESS = 0
|
|
};
|
|
|
|
static inline void clampedAdd(int16& a, int b) {
|
|
register int val;
|
|
#ifdef OUTPUT_UNSIGNED_AUDIO
|
|
val = (a ^ 0x8000) + b;
|
|
#else
|
|
val = a + b;
|
|
#endif
|
|
|
|
if (val > ST_SAMPLE_MAX)
|
|
val = ST_SAMPLE_MAX;
|
|
else if (val < ST_SAMPLE_MIN)
|
|
val = ST_SAMPLE_MIN;
|
|
|
|
#ifdef OUTPUT_UNSIGNED_AUDIO
|
|
a = ((int16)val) ^ 0x8000;
|
|
#else
|
|
a = val;
|
|
#endif
|
|
}
|
|
|
|
class RateConverter {
|
|
public:
|
|
RateConverter() {}
|
|
virtual ~RateConverter() {}
|
|
|
|
/**
|
|
* @return Number of sample pairs written into the buffer.
|
|
*/
|
|
virtual int flow(AudioStream &input, st_sample_t *obuf, st_size_t osamp, st_volume_t vol_l, st_volume_t vol_r) = 0;
|
|
|
|
virtual int drain(st_sample_t *obuf, st_size_t osamp, st_volume_t vol) = 0;
|
|
};
|
|
|
|
RateConverter *makeRateConverter(st_rate_t inrate, st_rate_t outrate, bool stereo, bool reverseStereo = false);
|
|
|
|
} // End of namespace Audio
|
|
|
|
#endif
|