Initial commit

engines/bladerunner/audio_cache.cpp

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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 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/>.
+ *
+ */
+
+#include "bladerunner/audio_cache.h"
+
+#include "common/stream.h"
+
+namespace BladeRunner {
+
+AudioCache::AudioCache() :
+	_totalSize(0),
+	_maxSize(2457600),
+	_accessCounter(0) {}
+
+AudioCache::~AudioCache() {
+	for (uint i = 0; i != _cacheItems.size(); ++i) {
+		free(_cacheItems[i].data);
+	}
+}
+
+bool AudioCache::canAllocate(uint32 size) const {
+	Common::StackLock lock(_mutex);
+
+	return _maxSize - _totalSize >= size;
+}
+
+bool AudioCache::dropOldest() {
+	Common::StackLock lock(_mutex);
+
+	if (_cacheItems.size() == 0)
+		return false;
+
+	int oldest = -1;
+	for (uint i = 1; i != _cacheItems.size(); ++i) {
+		if (_cacheItems[i].refs == 0) {
+			if (oldest == -1 || _cacheItems[i].lastAccess < _cacheItems[oldest].lastAccess) {
+				oldest = i;
+			}
+		}
+	}
+
+	if (oldest == -1) {
+		return false;
+	}
+
+	memset(_cacheItems[oldest].data, 0x00, _cacheItems[oldest].size);
+	free(_cacheItems[oldest].data);
+	_totalSize -= _cacheItems[oldest].size;
+	_cacheItems.remove_at(oldest);
+	return true;
+}
+
+byte *AudioCache::findByHash(int32 hash) {
+	Common::StackLock lock(_mutex);
+
+	for (uint i = 0; i != _cacheItems.size(); ++i) {
+		if (_cacheItems[i].hash == hash) {
+			_cacheItems[i].lastAccess = _accessCounter++;
+			return _cacheItems[i].data;
+		}
+	}
+
+	return nullptr;
+}
+
+void  AudioCache::storeByHash(int32 hash, Common::SeekableReadStream *stream) {
+	Common::StackLock lock(_mutex);
+
+	uint32 size = stream->size();
+	byte *data = (byte *)malloc(size);
+	stream->read(data, size);
+
+	cacheItem item = {
+		hash,
+		0,
+		_accessCounter++,
+		data,
+		size
+	};
+
+	_cacheItems.push_back(item);
+	_totalSize += size;
+}
+
+void AudioCache::incRef(int32 hash) {
+	Common::StackLock lock(_mutex);
+
+	for (uint i = 0; i != _cacheItems.size(); ++i) {
+		if (_cacheItems[i].hash == hash) {
+			++(_cacheItems[i].refs);
+			return;
+		}
+	}
+	assert(false && "AudioCache::incRef: hash not found");
+}
+
+void AudioCache::decRef(int32 hash) {
+	Common::StackLock lock(_mutex);
+
+	for (uint i = 0; i != _cacheItems.size(); ++i) {
+		if (_cacheItems[i].hash == hash) {
+			assert(_cacheItems[i].refs > 0);
+			--(_cacheItems[i].refs);
+			return;
+		}
+	}
+	assert(false && "AudioCache::decRef: hash not found");
+}
+
+} // End of namespace BladeRunner