NuCachedSource2.h revision a628f89503e024e2b3f4dad88edd326845e058b9
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 virtual DecryptHandle* DrmInitialization(DrmManagerClient *client); 41 virtual void getDrmInfo(DecryptHandle **handle, DrmManagerClient **client); 42 //////////////////////////////////////////////////////////////////////////// 43 44 size_t cachedSize(); 45 size_t approxDataRemaining(bool *eos); 46 47 void suspend(); 48 void clearCacheAndResume(); 49 50 void resumeFetchingIfNecessary(); 51 52protected: 53 virtual ~NuCachedSource2(); 54 55private: 56 friend struct AHandlerReflector<NuCachedSource2>; 57 58 enum { 59 kPageSize = 65536, 60 kHighWaterThreshold = 5 * 1024 * 1024, 61 kLowWaterThreshold = 1024 * 1024, 62 63 // Read data after a 15 sec timeout whether we're actively 64 // fetching or not. 65 kKeepAliveIntervalUs = 15000000, 66 }; 67 68 enum { 69 kWhatFetchMore = 'fetc', 70 kWhatRead = 'read', 71 kWhatSuspend = 'susp', 72 }; 73 74 sp<DataSource> mSource; 75 sp<AHandlerReflector<NuCachedSource2> > mReflector; 76 sp<ALooper> mLooper; 77 78 Mutex mSerializer; 79 Mutex mLock; 80 Condition mCondition; 81 82 PageCache *mCache; 83 off_t mCacheOffset; 84 status_t mFinalStatus; 85 off_t mLastAccessPos; 86 sp<AMessage> mAsyncResult; 87 bool mFetching; 88 int64_t mLastFetchTimeUs; 89 bool mSuspended; 90 91 void onMessageReceived(const sp<AMessage> &msg); 92 void onFetch(); 93 void onRead(const sp<AMessage> &msg); 94 void onSuspend(); 95 96 void fetchInternal(); 97 ssize_t readInternal(off_t offset, void *data, size_t size); 98 status_t seekInternal_l(off_t offset); 99 100 size_t approxDataRemaining_l(bool *eos); 101 void restartPrefetcherIfNecessary_l(bool ignoreLowWaterThreshold = false); 102 103 DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2); 104}; 105 106} // namespace android 107 108#endif // NU_CACHED_SOURCE_2_H_ 109