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/* 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.
*
*/
#include "titanic/sound/audio_buffer.h"
namespace Titanic {
CAudioBuffer::CAudioBuffer(int bufferSize) : _flag(true), _disabled(false) {
_buffer.resize(bufferSize);
reset();
}
CAudioBuffer::~CAudioBuffer() {
_buffer.clear();
}
void CAudioBuffer::reset() {
_flag = true;
_readBytesLeft = _writeBytesLeft = _buffer.size() / 2;
}
byte *CAudioBuffer::getBegin() {
return _flag ? &_buffer[_buffer.size() / 2] : &_buffer[0];
}
byte *CAudioBuffer::getEnd() {
return _flag ? &_buffer[0] : &_buffer[_buffer.size() / 2];
}
int16 *CAudioBuffer::getReadPtr() {
byte *ptr = getBegin();
return (int16 *)(ptr + (_buffer.size() / 2 - _readBytesLeft));
}
int16 *CAudioBuffer::getWritePtr() {
byte *ptr = getEnd();
return (int16 *)(ptr + (_buffer.size() / 2 - _writeBytesLeft));
}
void CAudioBuffer::advanceRead(int size) {
_readBytesLeft -= size;
if (_readBytesLeft < 0) {
_readBytesLeft = 0;
} else if (size && !_writeBytesLeft) {
reverse();
}
}
void CAudioBuffer::advanceWrite(int size) {
_writeBytesLeft -= size;
if (_writeBytesLeft < 0) {
_writeBytesLeft = 0;
} else if (size && !_readBytesLeft) {
reverse();
}
}
void CAudioBuffer::reverse() {
_flag = !_flag;
_readBytesLeft = _writeBytesLeft = _buffer.size() / 2;
}
void CAudioBuffer::enterCriticalSection() {
_mutex.lock();
}
void CAudioBuffer::leaveCriticalSection() {
_mutex.unlock();
}
} // End of namespace Titanic
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