mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-24 18:56:33 +00:00
c520d2d423
svn-id: r9190
92 lines
3.1 KiB
C++
92 lines
3.1 KiB
C++
/* 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.
|
|
*
|
|
* $Header$
|
|
*
|
|
*/
|
|
|
|
#include "audiostream.h"
|
|
#include "mixer.h"
|
|
|
|
template<int channels, int sampleSize>
|
|
class MemoryAudioInputStream : public AudioInputStream {
|
|
protected:
|
|
const byte *_ptr;
|
|
const byte *_end;
|
|
void advance() { _ptr += channels * sampleSize; }
|
|
public:
|
|
MemoryAudioInputStream(const byte *ptr, uint len) : _ptr(ptr), _end(ptr+len) { }
|
|
virtual int size() { return (_end - _ptr) / (channels * sampleSize); }
|
|
};
|
|
|
|
|
|
template<int channels>
|
|
class Input8bitSignedStream : public MemoryAudioInputStream<channels, 1> {
|
|
protected:
|
|
int16 readIntern() { int8 v = (int8)*_ptr; return v << 8; }
|
|
public:
|
|
Input8bitSignedStream(const byte *ptr, int len) : MemoryAudioInputStream<channels, 1>(ptr, len) { }
|
|
};
|
|
|
|
template<int channels>
|
|
class Input8bitUnsignedStream : public MemoryAudioInputStream<channels, 1> {
|
|
protected:
|
|
int16 readIntern() { int8 v = (int8)(*_ptr ^ 0x80); return v << 8; }
|
|
public:
|
|
Input8bitUnsignedStream(const byte *ptr, int len) : MemoryAudioInputStream<channels, 1>(ptr, len) { }
|
|
};
|
|
|
|
template<int channels>
|
|
class Input16bitSignedStream : public MemoryAudioInputStream<channels, 2> {
|
|
protected:
|
|
int16 readIntern() { return (int16)READ_BE_UINT16(_ptr); }
|
|
public:
|
|
Input16bitSignedStream(const byte *ptr, int len) : MemoryAudioInputStream<channels, 2>(ptr, len) { }
|
|
};
|
|
|
|
template<int channels>
|
|
class Input16bitUnsignedStream : public MemoryAudioInputStream<channels, 2> {
|
|
protected:
|
|
int16 readIntern() { return (int16)(READ_BE_UINT16(_ptr) ^ 0x8000); }
|
|
public:
|
|
Input16bitUnsignedStream(const byte *ptr, int len) : MemoryAudioInputStream<channels, 2>(ptr, len) { }
|
|
};
|
|
|
|
|
|
template<int channels>
|
|
static AudioInputStream *makeInputStream(const byte *ptr, uint32 len, bool isUnsigned, bool is16Bit) {
|
|
if (isUnsigned) {
|
|
if (is16Bit)
|
|
return new Input16bitUnsignedStream<channels>(ptr, len);
|
|
else
|
|
return new Input8bitUnsignedStream<channels>(ptr, len);
|
|
} else {
|
|
if (is16Bit)
|
|
return new Input16bitSignedStream<channels>(ptr, len);
|
|
else
|
|
return new Input8bitSignedStream<channels>(ptr, len);
|
|
}
|
|
}
|
|
|
|
|
|
AudioInputStream *makeInputStream(byte _flags, const byte *ptr, uint32 len) {
|
|
if (_flags & SoundMixer::FLAG_STEREO)
|
|
return makeInputStream<2>(ptr, len, _flags & SoundMixer::FLAG_UNSIGNED, _flags & SoundMixer::FLAG_16BITS);
|
|
else
|
|
return makeInputStream<1>(ptr, len, _flags & SoundMixer::FLAG_UNSIGNED, _flags & SoundMixer::FLAG_16BITS);
|
|
}
|