NuCachedSource2.h revision 6511c9755c3a3360ba869772600c7aae048a7ffc
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(off64_t offset, void *data, size_t size); 36 37 virtual status_t getSize(off64_t *size); 38 virtual uint32_t flags(); 39 40 virtual sp<DecryptHandle> DrmInitialization(); 41 virtual void getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client); 42 virtual String8 getUri(); 43 44 virtual String8 getMIMEType() const; 45 46 //////////////////////////////////////////////////////////////////////////// 47 48 size_t cachedSize(); 49 size_t approxDataRemaining(status_t *finalStatus); 50 51 void resumeFetchingIfNecessary(); 52 53protected: 54 virtual ~NuCachedSource2(); 55 56private: 57 friend struct AHandlerReflector<NuCachedSource2>; 58 59 enum { 60 kPageSize = 65536, 61 kHighWaterThreshold = 20 * 1024 * 1024, 62 kLowWaterThreshold = 4 * 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 }; 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 off64_t mCacheOffset; 84 status_t mFinalStatus; 85 off64_t mLastAccessPos; 86 sp<AMessage> mAsyncResult; 87 bool mFetching; 88 int64_t mLastFetchTimeUs; 89 90 void onMessageReceived(const sp<AMessage> &msg); 91 void onFetch(); 92 void onRead(const sp<AMessage> &msg); 93 94 void fetchInternal(); 95 ssize_t readInternal(off64_t offset, void *data, size_t size); 96 status_t seekInternal_l(off64_t offset); 97 98 size_t approxDataRemaining_l(status_t *finalStatus); 99 void restartPrefetcherIfNecessary_l(bool ignoreLowWaterThreshold = false); 100 101 DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2); 102}; 103 104} // namespace android 105 106#endif // NU_CACHED_SOURCE_2_H_ 107