NuCachedSource2.h revision b371426ce4cf2fa6d8c3d1903b61322feb165d35
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 50protected: 51 virtual ~NuCachedSource2(); 52 53private: 54 friend struct AHandlerReflector<NuCachedSource2>; 55 56 enum { 57 kPageSize = 65536, 58 kHighWaterThreshold = 5 * 1024 * 1024, 59 kLowWaterThreshold = 512 * 1024, 60 61 // Read data after a 15 sec timeout whether we're actively 62 // fetching or not. 63 kKeepAliveIntervalUs = 15000000, 64 }; 65 66 enum { 67 kWhatFetchMore = 'fetc', 68 kWhatRead = 'read', 69 kWhatSuspend = 'susp', 70 }; 71 72 sp<DataSource> mSource; 73 sp<AHandlerReflector<NuCachedSource2> > mReflector; 74 sp<ALooper> mLooper; 75 76 Mutex mSerializer; 77 Mutex mLock; 78 Condition mCondition; 79 80 PageCache *mCache; 81 off_t mCacheOffset; 82 status_t mFinalStatus; 83 off_t mLastAccessPos; 84 sp<AMessage> mAsyncResult; 85 bool mFetching; 86 int64_t mLastFetchTimeUs; 87 bool mSuspended; 88 89 void onMessageReceived(const sp<AMessage> &msg); 90 void onFetch(); 91 void onRead(const sp<AMessage> &msg); 92 void onSuspend(); 93 94 void fetchInternal(); 95 ssize_t readInternal(off_t offset, void *data, size_t size); 96 status_t seekInternal_l(off_t offset); 97 98 size_t approxDataRemaining_l(bool *eos); 99 void restartPrefetcherIfNecessary_l(); 100 101 DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2); 102}; 103 104} // namespace android 105 106#endif // NU_CACHED_SOURCE_2_H_ 107