NuCachedSource2.h revision b5ce361d19e69fe156f7188c9ee0f4734b259874
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 45 size_t cachedSize(); 46 size_t approxDataRemaining(status_t *finalStatus); 47 48 void resumeFetchingIfNecessary(); 49 50protected: 51 virtual ~NuCachedSource2(); 52 53private: 54 friend struct AHandlerReflector<NuCachedSource2>; 55 56 enum { 57 kPageSize = 65536, 58 kHighWaterThreshold = 20 * 1024 * 1024, 59 kLowWaterThreshold = 4 * 1024 * 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 }; 70 71 sp<DataSource> mSource; 72 sp<AHandlerReflector<NuCachedSource2> > mReflector; 73 sp<ALooper> mLooper; 74 75 Mutex mSerializer; 76 Mutex mLock; 77 Condition mCondition; 78 79 PageCache *mCache; 80 off64_t mCacheOffset; 81 status_t mFinalStatus; 82 off64_t mLastAccessPos; 83 sp<AMessage> mAsyncResult; 84 bool mFetching; 85 int64_t mLastFetchTimeUs; 86 87 void onMessageReceived(const sp<AMessage> &msg); 88 void onFetch(); 89 void onRead(const sp<AMessage> &msg); 90 91 void fetchInternal(); 92 ssize_t readInternal(off64_t offset, void *data, size_t size); 93 status_t seekInternal_l(off64_t offset); 94 95 size_t approxDataRemaining_l(status_t *finalStatus); 96 void restartPrefetcherIfNecessary_l(bool ignoreLowWaterThreshold = false); 97 98 DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2); 99}; 100 101} // namespace android 102 103#endif // NU_CACHED_SOURCE_2_H_ 104