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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 close();
     41 
     42     virtual void disconnect();
     43 
     44     virtual status_t getSize(off64_t *size);
     45     virtual uint32_t flags();
     46 
     47     virtual sp<DecryptHandle> DrmInitialization(const char* mime);
     48     virtual String8 getUri();
     49 
     50     virtual String8 getMIMEType() const;
     51 
     52     virtual String8 toString() {
     53         return mName;
     54     }
     55 
     56     status_t getAvailableSize(off64_t offset, off64_t *size);
     57 
     58     ////////////////////////////////////////////////////////////////////////////
     59 
     60     size_t cachedSize();
     61     size_t approxDataRemaining(status_t *finalStatus) const;
     62 
     63     void resumeFetchingIfNecessary();
     64 
     65     // The following methods are supported only if the
     66     // data source is HTTP-based; otherwise, ERROR_UNSUPPORTED
     67     // is returned.
     68     status_t getEstimatedBandwidthKbps(int32_t *kbps);
     69     status_t setCacheStatCollectFreq(int32_t freqMs);
     70 
     71     static void RemoveCacheSpecificHeaders(
     72             KeyedVector<String8, String8> *headers,
     73             String8 *cacheConfig,
     74             bool *disconnectAtHighwatermark);
     75 
     76 protected:
     77     virtual ~NuCachedSource2();
     78 
     79 private:
     80     friend struct AHandlerReflector<NuCachedSource2>;
     81 
     82     NuCachedSource2(
     83             const sp<DataSource> &source,
     84             const char *cacheConfig,
     85             bool disconnectAtHighwatermark);
     86 
     87     enum {
     88         kPageSize                       = 65536,
     89         kDefaultHighWaterThreshold      = 20 * 1024 * 1024,
     90         kDefaultLowWaterThreshold       = 4 * 1024 * 1024,
     91 
     92         // Read data after a 15 sec timeout whether we're actively
     93         // fetching or not.
     94         kDefaultKeepAliveIntervalUs     = 15000000,
     95     };
     96 
     97     enum {
     98         kWhatFetchMore  = 'fetc',
     99         kWhatRead       = 'read',
    100     };
    101 
    102     enum {
    103         kMaxNumRetries = 10,
    104     };
    105 
    106     sp<DataSource> mSource;
    107     sp<AHandlerReflector<NuCachedSource2> > mReflector;
    108     sp<ALooper> mLooper;
    109     String8 mName;
    110 
    111     Mutex mSerializer;
    112     mutable Mutex mLock;
    113     Condition mCondition;
    114 
    115     PageCache *mCache;
    116     off64_t mCacheOffset;
    117     status_t mFinalStatus;
    118     off64_t mLastAccessPos;
    119     sp<AMessage> mAsyncResult;
    120     bool mFetching;
    121     bool mDisconnecting;
    122     int64_t mLastFetchTimeUs;
    123 
    124     int32_t mNumRetriesLeft;
    125 
    126     size_t mHighwaterThresholdBytes;
    127     size_t mLowwaterThresholdBytes;
    128 
    129     // If the keep-alive interval is 0, keep-alives are disabled.
    130     int64_t mKeepAliveIntervalUs;
    131 
    132     bool mDisconnectAtHighwatermark;
    133 
    134     void onMessageReceived(const sp<AMessage> &msg);
    135     void onFetch();
    136     void onRead(const sp<AMessage> &msg);
    137 
    138     void fetchInternal();
    139     ssize_t readInternal(off64_t offset, void *data, size_t size);
    140     status_t seekInternal_l(off64_t offset);
    141 
    142     size_t approxDataRemaining_l(off64_t offset, status_t *finalStatus) const;
    143 
    144     void restartPrefetcherIfNecessary_l(
    145             bool ignoreLowWaterThreshold = false, bool force = false);
    146 
    147     void updateCacheParamsFromSystemProperty();
    148     void updateCacheParamsFromString(const char *s);
    149 
    150     DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2);
    151 };
    152 
    153 }  // namespace android
    154 
    155 #endif  // NU_CACHED_SOURCE_2_H_
    156