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      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/DataSource.h>
     22 #include <media/stagefright/foundation/ABase.h>
     23 #include <media/stagefright/foundation/AHandlerReflector.h>
     24 
     25 namespace android {
     26 
     27 struct ALooper;
     28 struct PageCache;
     29 
     30 struct NuCachedSource2 : public DataSource {
     31     static sp<NuCachedSource2> Create(
     32             const sp<DataSource> &source,
     33             const char *cacheConfig = NULL,
     34             bool disconnectAtHighwatermark = false);
     35 
     36     virtual status_t initCheck() const;
     37 
     38     virtual ssize_t readAt(off64_t offset, void *data, size_t size);
     39 
     40     virtual void disconnect();
     41 
     42     virtual status_t getSize(off64_t *size);
     43     virtual uint32_t flags();
     44 
     45     virtual sp<DecryptHandle> DrmInitialization(const char* mime);
     46     virtual String8 getUri();
     47 
     48     virtual String8 getMIMEType() const;
     49 
     50     virtual String8 toString() {
     51         return mName;
     52     }
     53 
     54     ////////////////////////////////////////////////////////////////////////////
     55 
     56     size_t cachedSize();
     57     size_t approxDataRemaining(status_t *finalStatus) const;
     58 
     59     void resumeFetchingIfNecessary();
     60 
     61     // The following methods are supported only if the
     62     // data source is HTTP-based; otherwise, ERROR_UNSUPPORTED
     63     // is returned.
     64     status_t getEstimatedBandwidthKbps(int32_t *kbps);
     65     status_t setCacheStatCollectFreq(int32_t freqMs);
     66 
     67     static void RemoveCacheSpecificHeaders(
     68             KeyedVector<String8, String8> *headers,
     69             String8 *cacheConfig,
     70             bool *disconnectAtHighwatermark);
     71 
     72 protected:
     73     virtual ~NuCachedSource2();
     74 
     75 private:
     76     friend struct AHandlerReflector<NuCachedSource2>;
     77 
     78     NuCachedSource2(
     79             const sp<DataSource> &source,
     80             const char *cacheConfig,
     81             bool disconnectAtHighwatermark);
     82 
     83     enum {
     84         kPageSize                       = 65536,
     85         kDefaultHighWaterThreshold      = 20 * 1024 * 1024,
     86         kDefaultLowWaterThreshold       = 4 * 1024 * 1024,
     87 
     88         // Read data after a 15 sec timeout whether we're actively
     89         // fetching or not.
     90         kDefaultKeepAliveIntervalUs     = 15000000,
     91     };
     92 
     93     enum {
     94         kWhatFetchMore  = 'fetc',
     95         kWhatRead       = 'read',
     96     };
     97 
     98     enum {
     99         kMaxNumRetries = 10,
    100     };
    101 
    102     sp<DataSource> mSource;
    103     sp<AHandlerReflector<NuCachedSource2> > mReflector;
    104     sp<ALooper> mLooper;
    105     String8 mName;
    106 
    107     Mutex mSerializer;
    108     mutable Mutex mLock;
    109     Condition mCondition;
    110 
    111     PageCache *mCache;
    112     off64_t mCacheOffset;
    113     status_t mFinalStatus;
    114     off64_t mLastAccessPos;
    115     sp<AMessage> mAsyncResult;
    116     bool mFetching;
    117     bool mDisconnecting;
    118     int64_t mLastFetchTimeUs;
    119 
    120     int32_t mNumRetriesLeft;
    121 
    122     size_t mHighwaterThresholdBytes;
    123     size_t mLowwaterThresholdBytes;
    124 
    125     // If the keep-alive interval is 0, keep-alives are disabled.
    126     int64_t mKeepAliveIntervalUs;
    127 
    128     bool mDisconnectAtHighwatermark;
    129 
    130     void onMessageReceived(const sp<AMessage> &msg);
    131     void onFetch();
    132     void onRead(const sp<AMessage> &msg);
    133 
    134     void fetchInternal();
    135     ssize_t readInternal(off64_t offset, void *data, size_t size);
    136     status_t seekInternal_l(off64_t offset);
    137 
    138     size_t approxDataRemaining_l(status_t *finalStatus) const;
    139 
    140     void restartPrefetcherIfNecessary_l(
    141             bool ignoreLowWaterThreshold = false, bool force = false);
    142 
    143     void updateCacheParamsFromSystemProperty();
    144     void updateCacheParamsFromString(const char *s);
    145 
    146     DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2);
    147 };
    148 
    149 }  // namespace android
    150 
    151 #endif  // NU_CACHED_SOURCE_2_H_
    152