| /* |
| * 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 NU_CACHED_SOURCE_2_H_ |
| |
| #define NU_CACHED_SOURCE_2_H_ |
| |
| #include <media/stagefright/foundation/ABase.h> |
| #include <media/stagefright/foundation/AHandlerReflector.h> |
| #include <media/stagefright/DataSource.h> |
| |
| namespace android { |
| |
| struct ALooper; |
| struct PageCache; |
| |
| struct NuCachedSource2 : public DataSource { |
| NuCachedSource2(const sp<DataSource> &source); |
| |
| virtual status_t initCheck() const; |
| |
| virtual ssize_t readAt(off_t offset, void *data, size_t size); |
| |
| virtual status_t getSize(off_t *size); |
| virtual uint32_t flags(); |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| size_t cachedSize(); |
| size_t approxDataRemaining(bool *eos); |
| |
| void suspend(); |
| void clearCacheAndResume(); |
| |
| protected: |
| virtual ~NuCachedSource2(); |
| |
| private: |
| friend struct AHandlerReflector<NuCachedSource2>; |
| |
| enum { |
| kPageSize = 65536, |
| kHighWaterThreshold = 5 * 1024 * 1024, |
| kLowWaterThreshold = 512 * 1024, |
| |
| // Read data after a 15 sec timeout whether we're actively |
| // fetching or not. |
| kKeepAliveIntervalUs = 15000000, |
| }; |
| |
| enum { |
| kWhatFetchMore = 'fetc', |
| kWhatRead = 'read', |
| kWhatSuspend = 'susp', |
| }; |
| |
| sp<DataSource> mSource; |
| sp<AHandlerReflector<NuCachedSource2> > mReflector; |
| sp<ALooper> mLooper; |
| |
| Mutex mSerializer; |
| Mutex mLock; |
| Condition mCondition; |
| |
| PageCache *mCache; |
| off_t mCacheOffset; |
| status_t mFinalStatus; |
| off_t mLastAccessPos; |
| sp<AMessage> mAsyncResult; |
| bool mFetching; |
| int64_t mLastFetchTimeUs; |
| bool mSuspended; |
| |
| void onMessageReceived(const sp<AMessage> &msg); |
| void onFetch(); |
| void onRead(const sp<AMessage> &msg); |
| void onSuspend(); |
| |
| void fetchInternal(); |
| ssize_t readInternal(off_t offset, void *data, size_t size); |
| status_t seekInternal_l(off_t offset); |
| |
| size_t approxDataRemaining_l(bool *eos); |
| void restartPrefetcherIfNecessary_l(); |
| |
| DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2); |
| }; |
| |
| } // namespace android |
| |
| #endif // NU_CACHED_SOURCE_2_H_ |