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