NuCachedSource2.h revision 0683eba6b35c396c21f10e926709f2f8fc05f090
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 53 // The following methods are supported only if the 54 // data source is HTTP-based; otherwise, ERROR_UNSUPPORTED 55 // is returned. 56 status_t getEstimatedBandwidthKbps(int32_t *kbps); 57 status_t setCacheStatCollectFreq(int32_t freqMs); 58 59protected: 60 virtual ~NuCachedSource2(); 61 62private: 63 friend struct AHandlerReflector<NuCachedSource2>; 64 65 enum { 66 kPageSize = 65536, 67 kHighWaterThreshold = 20 * 1024 * 1024, 68 kLowWaterThreshold = 4 * 1024 * 1024, 69 70 // Read data after a 15 sec timeout whether we're actively 71 // fetching or not. 72 kKeepAliveIntervalUs = 15000000, 73 }; 74 75 enum { 76 kWhatFetchMore = 'fetc', 77 kWhatRead = 'read', 78 }; 79 80 enum { 81 kMaxNumRetries = 10, 82 }; 83 84 sp<DataSource> mSource; 85 sp<AHandlerReflector<NuCachedSource2> > mReflector; 86 sp<ALooper> mLooper; 87 88 Mutex mSerializer; 89 Mutex mLock; 90 Condition mCondition; 91 92 PageCache *mCache; 93 off64_t mCacheOffset; 94 status_t mFinalStatus; 95 off64_t mLastAccessPos; 96 sp<AMessage> mAsyncResult; 97 bool mFetching; 98 int64_t mLastFetchTimeUs; 99 100 int32_t mNumRetriesLeft; 101 102 void onMessageReceived(const sp<AMessage> &msg); 103 void onFetch(); 104 void onRead(const sp<AMessage> &msg); 105 106 void fetchInternal(); 107 ssize_t readInternal(off64_t offset, void *data, size_t size); 108 status_t seekInternal_l(off64_t offset); 109 110 size_t approxDataRemaining_l(status_t *finalStatus); 111 112 void restartPrefetcherIfNecessary_l( 113 bool ignoreLowWaterThreshold = false, bool force = false); 114 115 DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2); 116}; 117 118} // namespace android 119 120#endif // NU_CACHED_SOURCE_2_H_ 121