/* 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"
#include "common/algorithm.h"

namespace Titanic {

CAudioBuffer::CAudioBuffer(int maxSize) : _finished(false) {
	_data.resize(maxSize);
	reset();
}

void CAudioBuffer::reset() {
	_frontP = _backP = &_data[0];
}

void CAudioBuffer::push(int16 value) {
	assert(!full());
	compact();

	*_backP++ = value;
}

void CAudioBuffer::push(int16 *values, int count) {
	compact();
	assert(freeSize() >= count);

	Common::copy(values, values + count, _backP);
	_backP += count;
}

int16 CAudioBuffer::pop() {
	assert(!empty());
	return *_frontP++;
}

void CAudioBuffer::compact() {
	if (_frontP != &_data[0]) {
		Common::copy(_frontP, _backP, &_data[0]);
		_backP -= _frontP - &_data[0];
		_frontP = &_data[0];
	}
}

int CAudioBuffer::freeSize() {
	compact();
	return &_data[0] + _data.size() - _backP;
}

void CAudioBuffer::enterCriticalSection() {
	_mutex.lock();
}

void CAudioBuffer::leaveCriticalSection() {
	_mutex.unlock();
}

} // End of namespace Titanic