| /* |
| * Copyright (C) 2010 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. |
| */ |
| |
| #ifndef PREFETCHER_H_ |
| |
| #define PREFETCHER_H_ |
| |
| #include <utils/RefBase.h> |
| #include <utils/Vector.h> |
| #include <utils/threads.h> |
| |
| namespace android { |
| |
| struct MediaSource; |
| struct PrefetchedSource; |
| |
| struct Prefetcher : public RefBase { |
| Prefetcher(); |
| |
| // Given an existing MediaSource returns a new MediaSource |
| // that will benefit from prefetching/caching the original one. |
| sp<MediaSource> addSource(const sp<MediaSource> &source); |
| |
| int64_t getCachedDurationUs(bool *noMoreData = NULL); |
| |
| // If provided (non-NULL), "continueFunc" will be called repeatedly |
| // while preparing and preparation will finish early if it returns |
| // false. In this case "-EINTR" is returned as a result. |
| status_t prepare( |
| bool (*continueFunc)(void *cookie) = NULL, |
| void *cookie = NULL); |
| |
| protected: |
| virtual ~Prefetcher(); |
| |
| private: |
| Mutex mLock; |
| Condition mCondition; |
| |
| Vector<wp<PrefetchedSource> > mSources; |
| android_thread_id_t mThread; |
| bool mDone; |
| bool mThreadExited; |
| |
| void startThread(); |
| void stopThread(); |
| |
| static int ThreadWrapper(void *me); |
| void threadFunc(); |
| |
| Prefetcher(const Prefetcher &); |
| Prefetcher &operator=(const Prefetcher &); |
| }; |
| |
| } // namespace android |
| |
| #endif // PREFETCHER_H_ |