| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| |
| package android.filterfw.core; |
| |
| import android.filterfw.core.Frame; |
| import android.filterfw.core.FrameFormat; |
| import android.filterfw.core.SimpleFrameManager; |
| |
| import java.util.Map; |
| import java.util.SortedMap; |
| import java.util.TreeMap; |
| |
| /** |
| * @hide |
| */ |
| public class CachedFrameManager extends SimpleFrameManager { |
| |
| private SortedMap<Integer, Frame> mAvailableFrames; |
| private int mStorageCapacity = 24 * 1024 * 1024; // Cap default storage to 24MB |
| private int mStorageSize = 0; |
| private int mTimeStamp = 0; |
| |
| public CachedFrameManager() { |
| super(); |
| mAvailableFrames = new TreeMap<Integer, Frame>(); |
| } |
| |
| @Override |
| public Frame newFrame(FrameFormat format) { |
| Frame result = findAvailableFrame(format, Frame.NO_BINDING, 0); |
| if (result == null) { |
| result = super.newFrame(format); |
| } |
| result.setTimestamp(Frame.TIMESTAMP_NOT_SET); |
| return result; |
| } |
| |
| @Override |
| public Frame newBoundFrame(FrameFormat format, int bindingType, long bindingId) { |
| Frame result = findAvailableFrame(format, bindingType, bindingId); |
| if (result == null) { |
| result = super.newBoundFrame(format, bindingType, bindingId); |
| } |
| result.setTimestamp(Frame.TIMESTAMP_NOT_SET); |
| return result; |
| } |
| |
| @Override |
| public Frame retainFrame(Frame frame) { |
| return super.retainFrame(frame); |
| } |
| |
| @Override |
| public Frame releaseFrame(Frame frame) { |
| if (frame.isReusable()) { |
| int refCount = frame.decRefCount(); |
| if (refCount == 0 && frame.hasNativeAllocation()) { |
| if (!storeFrame(frame)) { |
| frame.releaseNativeAllocation(); |
| } |
| return null; |
| } else if (refCount < 0) { |
| throw new RuntimeException("Frame reference count dropped below 0!"); |
| } |
| } else { |
| super.releaseFrame(frame); |
| } |
| return frame; |
| } |
| |
| public void clearCache() { |
| for (Frame frame : mAvailableFrames.values()) { |
| frame.releaseNativeAllocation(); |
| } |
| mAvailableFrames.clear(); |
| } |
| |
| @Override |
| public void tearDown() { |
| clearCache(); |
| } |
| |
| private boolean storeFrame(Frame frame) { |
| synchronized(mAvailableFrames) { |
| // Make sure this frame alone does not exceed capacity |
| int frameSize = frame.getFormat().getSize(); |
| if (frameSize > mStorageCapacity) { |
| return false; |
| } |
| |
| // Drop frames if adding this frame would exceed capacity |
| int newStorageSize = mStorageSize + frameSize; |
| while (newStorageSize > mStorageCapacity) { |
| dropOldestFrame(); |
| newStorageSize = mStorageSize + frameSize; |
| } |
| |
| // Store new frame |
| frame.onFrameStore(); |
| mStorageSize = newStorageSize; |
| mAvailableFrames.put(mTimeStamp, frame); |
| ++mTimeStamp; |
| return true; |
| } |
| } |
| |
| private void dropOldestFrame() { |
| int oldest = mAvailableFrames.firstKey(); |
| Frame frame = mAvailableFrames.get(oldest); |
| mStorageSize -= frame.getFormat().getSize(); |
| frame.releaseNativeAllocation(); |
| mAvailableFrames.remove(oldest); |
| } |
| |
| private Frame findAvailableFrame(FrameFormat format, int bindingType, long bindingId) { |
| // Look for a frame that is compatible with the requested format |
| synchronized(mAvailableFrames) { |
| for (Map.Entry<Integer, Frame> entry : mAvailableFrames.entrySet()) { |
| Frame frame = entry.getValue(); |
| // Check that format is compatible |
| if (frame.getFormat().isReplaceableBy(format)) { |
| // Check that binding is compatible (if frame is bound) |
| if ((bindingType == frame.getBindingType()) |
| && (bindingType == Frame.NO_BINDING || bindingId == frame.getBindingId())) { |
| // We found one! Take it out of the set of available frames and attach the |
| // requested format to it. |
| super.retainFrame(frame); |
| mAvailableFrames.remove(entry.getKey()); |
| frame.onFrameFetch(); |
| frame.reset(format); |
| mStorageSize -= format.getSize(); |
| return frame; |
| } |
| } |
| } |
| } |
| return null; |
| } |
| |
| } |