NuCachedSource2.h revision 771b85d9245a24273497792a2515d88d31c99e1e
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 virtual String8 getUri(); 43 //////////////////////////////////////////////////////////////////////////// 44 45 size_t cachedSize(); 46 size_t approxDataRemaining(bool *eos); 47 48 void suspend(); 49 void clearCacheAndResume(); 50 51 void resumeFetchingIfNecessary(); 52 53protected: 54 virtual ~NuCachedSource2(); 55 56private: 57 friend struct AHandlerReflector<NuCachedSource2>; 58 59 enum { 60 kPageSize = 65536, 61 kHighWaterThreshold = 5 * 1024 * 1024, 62 kLowWaterThreshold = 1024 * 1024, 63 64 // Read data after a 15 sec timeout whether we're actively 65 // fetching or not. 66 kKeepAliveIntervalUs = 15000000, 67 }; 68 69 enum { 70 kWhatFetchMore = 'fetc', 71 kWhatRead = 'read', 72 kWhatSuspend = 'susp', 73 }; 74 75 sp<DataSource> mSource; 76 sp<AHandlerReflector<NuCachedSource2> > mReflector; 77 sp<ALooper> mLooper; 78 79 Mutex mSerializer; 80 Mutex mLock; 81 Condition mCondition; 82 83 PageCache *mCache; 84 off_t mCacheOffset; 85 status_t mFinalStatus; 86 off_t mLastAccessPos; 87 sp<AMessage> mAsyncResult; 88 bool mFetching; 89 int64_t mLastFetchTimeUs; 90 bool mSuspended; 91 92 void onMessageReceived(const sp<AMessage> &msg); 93 void onFetch(); 94 void onRead(const sp<AMessage> &msg); 95 void onSuspend(); 96 97 void fetchInternal(); 98 ssize_t readInternal(off_t offset, void *data, size_t size); 99 status_t seekInternal_l(off_t offset); 100 101 size_t approxDataRemaining_l(bool *eos); 102 void restartPrefetcherIfNecessary_l(bool ignoreLowWaterThreshold = false); 103 104 DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2); 105}; 106 107} // namespace android 108 109#endif // NU_CACHED_SOURCE_2_H_ 110