NuCachedSource2.h revision a5273ebd1746368662a597643d6701a5046d5c7b
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef NU_CACHED_SOURCE_2_H_ 18 19#define NU_CACHED_SOURCE_2_H_ 20 21#include <media/stagefright/foundation/ABase.h> 22#include <media/stagefright/foundation/AHandlerReflector.h> 23#include <media/stagefright/DataSource.h> 24 25namespace android { 26 27struct ALooper; 28struct PageCache; 29 30struct NuCachedSource2 : public DataSource { 31 NuCachedSource2(const sp<DataSource> &source); 32 33 virtual status_t initCheck() const; 34 35 virtual ssize_t readAt(off_t offset, void *data, size_t size); 36 37 virtual status_t getSize(off_t *size); 38 virtual uint32_t flags(); 39 40 //////////////////////////////////////////////////////////////////////////// 41 42 size_t cachedSize(); 43 size_t approxDataRemaining(bool *eos); 44 45protected: 46 virtual ~NuCachedSource2(); 47 48private: 49 friend struct AHandlerReflector<NuCachedSource2>; 50 51 enum { 52 kPageSize = 16384, 53 kHighWaterThreshold = 3 * 1024 * 1024, 54 kLowWaterThreshold = 512 * 1024, 55 56 // Read data after a 15 sec timeout whether we're actively 57 // fetching or not. 58 kKeepAliveIntervalUs = 15000000, 59 }; 60 61 enum { 62 kWhatFetchMore = 'fetc', 63 kWhatRead = 'read', 64 }; 65 66 sp<DataSource> mSource; 67 sp<AHandlerReflector<NuCachedSource2> > mReflector; 68 sp<ALooper> mLooper; 69 70 Mutex mSerializer; 71 Mutex mLock; 72 Condition mCondition; 73 74 PageCache *mCache; 75 off_t mCacheOffset; 76 status_t mFinalStatus; 77 off_t mLastAccessPos; 78 sp<AMessage> mAsyncResult; 79 bool mFetching; 80 int64_t mLastFetchTimeUs; 81 82 void onMessageReceived(const sp<AMessage> &msg); 83 void onFetch(); 84 void onRead(const sp<AMessage> &msg); 85 86 void fetchInternal(); 87 ssize_t readInternal(off_t offset, void *data, size_t size); 88 status_t seekInternal_l(off_t offset); 89 90 size_t approxDataRemaining_l(bool *eos); 91 void restartPrefetcherIfNecessary_l(); 92 93 DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2); 94}; 95 96} // namespace android 97 98#endif // NU_CACHED_SOURCE_2_H_ 99