mirror of
https://github.com/libretro/scummvm.git
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124 lines
3.7 KiB
C++
124 lines
3.7 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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#include "audiostream.h"
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#include "mixer.h"
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template<int channels, int sampleSize>
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class LinearMemoryStream : public AudioInputStream {
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protected:
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const byte *_ptr;
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const byte *_end;
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void advance() { _ptr += sampleSize; }
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public:
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LinearMemoryStream(const byte *ptr, uint len) : _ptr(ptr), _end(ptr+len) { }
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virtual int size() const { return (_end - _ptr) / sampleSize; }
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virtual bool isStereo() const { return channels == 2; }
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};
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#if 0
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TODO: Implement a wrapped memory stream, to be used by the ChannelStream class
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(and possibly others?)
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template<int channels, int sampleSize>
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class WrappedMemoryStream : public AudioInputStream {
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protected:
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byte *_bufferStart;
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byte *_bufferEnd;
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byte *_pos;
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byte *_end;
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void advance() {
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_ptr += channels * sampleSize;
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.. TODO: wrap
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}
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public:
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WrappedMemoryStream(const byte *ptr, uint len) : _bufferStart(ptr), _bufferEnd(ptr+len) { }
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virtual int size() const {
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int size = _end - _pos;
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if (size < 0)
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size += _bufferEnd - _bufferStart
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return size / (channels * sampleSize);
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}
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void append(const byte *ptr, uint len) {
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...
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}
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};
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#endif
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template<int channels, class T = class LinearMemoryStream<channels, 1> >
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class Input8bitSignedStream : public T {
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protected:
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int16 readIntern() { int8 v = (int8)*_ptr; return v << 8; }
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public:
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Input8bitSignedStream(const byte *ptr, int len) : T(ptr, len) { }
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};
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template<int channels, class T = class LinearMemoryStream<channels, 1> >
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class Input8bitUnsignedStream : public T {
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protected:
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int16 readIntern() { int8 v = (int8)(*_ptr ^ 0x80); return v << 8; }
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public:
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Input8bitUnsignedStream(const byte *ptr, int len) : T(ptr, len) { }
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};
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template<int channels, class T = class LinearMemoryStream<channels, 2> >
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class Input16bitSignedStream : public T {
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protected:
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int16 readIntern() { return (int16)READ_BE_UINT16(_ptr); }
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public:
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Input16bitSignedStream(const byte *ptr, int len) : T(ptr, len) { }
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};
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template<int channels, class T = class LinearMemoryStream<channels, 2> >
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class Input16bitUnsignedStream : public T {
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protected:
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int16 readIntern() { return (int16)(READ_BE_UINT16(_ptr) ^ 0x8000); }
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public:
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Input16bitUnsignedStream(const byte *ptr, int len) : T(ptr, len) { }
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};
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template<int channels>
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static AudioInputStream *makeInputStream(const byte *ptr, uint32 len, bool isUnsigned, bool is16Bit) {
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if (isUnsigned) {
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if (is16Bit)
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return new Input16bitUnsignedStream<channels>(ptr, len);
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else
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return new Input8bitUnsignedStream<channels>(ptr, len);
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} else {
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if (is16Bit)
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return new Input16bitSignedStream<channels>(ptr, len);
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else
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return new Input8bitSignedStream<channels>(ptr, len);
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}
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}
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AudioInputStream *makeInputStream(byte _flags, const byte *ptr, uint32 len) {
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if (_flags & SoundMixer::FLAG_STEREO)
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return makeInputStream<2>(ptr, len, _flags & SoundMixer::FLAG_UNSIGNED, _flags & SoundMixer::FLAG_16BITS);
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else
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return makeInputStream<1>(ptr, len, _flags & SoundMixer::FLAG_UNSIGNED, _flags & SoundMixer::FLAG_16BITS);
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}
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