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     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 void getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client);
47     virtual String8 getUri();
48 
49     virtual String8 getMIMEType() const;
50 
toStringNuCachedSource251     virtual String8 toString() {
52         return mName;
53     }
54 
55     ////////////////////////////////////////////////////////////////////////////
56 
57     size_t cachedSize();
58     size_t approxDataRemaining(status_t *finalStatus) const;
59 
60     void resumeFetchingIfNecessary();
61 
62     // The following methods are supported only if the
63     // data source is HTTP-based; otherwise, ERROR_UNSUPPORTED
64     // is returned.
65     status_t getEstimatedBandwidthKbps(int32_t *kbps);
66     status_t setCacheStatCollectFreq(int32_t freqMs);
67 
68     static void RemoveCacheSpecificHeaders(
69             KeyedVector<String8, String8> *headers,
70             String8 *cacheConfig,
71             bool *disconnectAtHighwatermark);
72 
73 protected:
74     virtual ~NuCachedSource2();
75 
76 private:
77     friend struct AHandlerReflector<NuCachedSource2>;
78 
79     NuCachedSource2(
80             const sp<DataSource> &source,
81             const char *cacheConfig,
82             bool disconnectAtHighwatermark);
83 
84     enum {
85         kPageSize                       = 65536,
86         kDefaultHighWaterThreshold      = 20 * 1024 * 1024,
87         kDefaultLowWaterThreshold       = 4 * 1024 * 1024,
88 
89         // Read data after a 15 sec timeout whether we're actively
90         // fetching or not.
91         kDefaultKeepAliveIntervalUs     = 15000000,
92     };
93 
94     enum {
95         kWhatFetchMore  = 'fetc',
96         kWhatRead       = 'read',
97     };
98 
99     enum {
100         kMaxNumRetries = 10,
101     };
102 
103     sp<DataSource> mSource;
104     sp<AHandlerReflector<NuCachedSource2> > mReflector;
105     sp<ALooper> mLooper;
106     String8 mName;
107 
108     Mutex mSerializer;
109     mutable Mutex mLock;
110     Condition mCondition;
111 
112     PageCache *mCache;
113     off64_t mCacheOffset;
114     status_t mFinalStatus;
115     off64_t mLastAccessPos;
116     sp<AMessage> mAsyncResult;
117     bool mFetching;
118     bool mDisconnecting;
119     int64_t mLastFetchTimeUs;
120 
121     int32_t mNumRetriesLeft;
122 
123     size_t mHighwaterThresholdBytes;
124     size_t mLowwaterThresholdBytes;
125 
126     // If the keep-alive interval is 0, keep-alives are disabled.
127     int64_t mKeepAliveIntervalUs;
128 
129     bool mDisconnectAtHighwatermark;
130 
131     void onMessageReceived(const sp<AMessage> &msg);
132     void onFetch();
133     void onRead(const sp<AMessage> &msg);
134 
135     void fetchInternal();
136     ssize_t readInternal(off64_t offset, void *data, size_t size);
137     status_t seekInternal_l(off64_t offset);
138 
139     size_t approxDataRemaining_l(status_t *finalStatus) const;
140 
141     void restartPrefetcherIfNecessary_l(
142             bool ignoreLowWaterThreshold = false, bool force = false);
143 
144     void updateCacheParamsFromSystemProperty();
145     void updateCacheParamsFromString(const char *s);
146 
147     DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2);
148 };
149 
150 }  // namespace android
151 
152 #endif  // NU_CACHED_SOURCE_2_H_
153