audio_cache.h

/* 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef BLADERUNNER_AUDIO_CACHE_H
#define BLADERUNNER_AUDIO_CACHE_H

#include "common/array.h"
#include "common/mutex.h"

namespace BladeRunner {

/*
 * This is a poor imitation of Bladerunner's resource cache
 */
class AudioCache {
    struct cacheItem {
        int32   hash;
        int     refs;
        uint    lastAccess;
        byte   *data;
        uint32  size;
    };

    Common::Mutex            _mutex;
    Common::Array<cacheItem> _cacheItems;

    uint32 _totalSize;
    uint32 _maxSize;
    uint32 _accessCounter;

public:
    AudioCache();
    ~AudioCache();

    bool  canAllocate(uint32 size) const;
    bool  dropOldest();
    byte *findByHash(int32 hash);
    void  storeByHash(int32 hash, Common::SeekableReadStream *stream);

    void  incRef(int32 hash);
    void  decRef(int32 hash);
};

} // End of namespace BladeRunner

#endif