| /* |
| * Copyright (C) 2009 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 CACHING_DATASOURCE_H_ |
| |
| #define CACHING_DATASOURCE_H_ |
| |
| #include <media/stagefright/DataSource.h> |
| #include <media/stagefright/MediaErrors.h> |
| #include <utils/threads.h> |
| |
| namespace android { |
| |
| class CachingDataSource : public DataSource { |
| public: |
| // Assumes ownership of "source". |
| CachingDataSource(DataSource *source, size_t pageSize, int numPages); |
| virtual ~CachingDataSource(); |
| |
| status_t InitCheck() const; |
| |
| virtual ssize_t read_at(off_t offset, void *data, size_t size); |
| |
| private: |
| struct Page { |
| Page *mPrev, *mNext; |
| off_t mOffset; |
| size_t mLength; |
| void *mData; |
| }; |
| |
| DataSource *mSource; |
| void *mData; |
| size_t mPageSize; |
| Page *mFirst, *mLast; |
| |
| Page *allocate_page(); |
| |
| Mutex mLock; |
| |
| CachingDataSource(const CachingDataSource &); |
| CachingDataSource &operator=(const CachingDataSource &); |
| }; |
| |
| } // namespace android |
| |
| #endif // CACHING_DATASOURCE_H_ |