mirror of
https://github.com/libretro/scummvm.git
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129 lines
3.0 KiB
C++
129 lines
3.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "bladerunner/audio_cache.h"
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#include "common/stream.h"
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namespace BladeRunner {
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AudioCache::AudioCache() :
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_totalSize(0),
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_maxSize(2457600),
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_accessCounter(0) {}
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AudioCache::~AudioCache() {
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for (uint i = 0; i != _cacheItems.size(); ++i) {
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free(_cacheItems[i].data);
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}
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}
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bool AudioCache::canAllocate(uint32 size) const {
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Common::StackLock lock(_mutex);
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return _maxSize - _totalSize >= size;
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}
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bool AudioCache::dropOldest() {
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Common::StackLock lock(_mutex);
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if (_cacheItems.size() == 0)
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return false;
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int oldest = -1;
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for (uint i = 1; i != _cacheItems.size(); ++i) {
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if (_cacheItems[i].refs == 0) {
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if (oldest == -1 || _cacheItems[i].lastAccess < _cacheItems[oldest].lastAccess) {
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oldest = i;
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}
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}
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}
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if (oldest == -1) {
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return false;
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}
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memset(_cacheItems[oldest].data, 0x00, _cacheItems[oldest].size);
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free(_cacheItems[oldest].data);
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_totalSize -= _cacheItems[oldest].size;
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_cacheItems.remove_at(oldest);
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return true;
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}
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byte *AudioCache::findByHash(int32 hash) {
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Common::StackLock lock(_mutex);
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for (uint i = 0; i != _cacheItems.size(); ++i) {
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if (_cacheItems[i].hash == hash) {
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_cacheItems[i].lastAccess = _accessCounter++;
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return _cacheItems[i].data;
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}
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}
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return nullptr;
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}
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void AudioCache::storeByHash(int32 hash, Common::SeekableReadStream *stream) {
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Common::StackLock lock(_mutex);
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uint32 size = stream->size();
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byte *data = (byte *)malloc(size);
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stream->read(data, size);
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cacheItem item = {
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hash,
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0,
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_accessCounter++,
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data,
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size
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};
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_cacheItems.push_back(item);
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_totalSize += size;
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}
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void AudioCache::incRef(int32 hash) {
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Common::StackLock lock(_mutex);
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for (uint i = 0; i != _cacheItems.size(); ++i) {
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if (_cacheItems[i].hash == hash) {
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++(_cacheItems[i].refs);
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return;
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}
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}
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assert(false && "AudioCache::incRef: hash not found");
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}
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void AudioCache::decRef(int32 hash) {
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Common::StackLock lock(_mutex);
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for (uint i = 0; i != _cacheItems.size(); ++i) {
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if (_cacheItems[i].hash == hash) {
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assert(_cacheItems[i].refs > 0);
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--(_cacheItems[i].refs);
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return;
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}
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}
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assert(false && "AudioCache::decRef: hash not found");
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}
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} // End of namespace BladeRunner
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