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
25namespace android {
26
27struct ALooper;
28struct PageCache;
29
30struct 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
72protected:
73    virtual ~NuCachedSource2();
74
75private:
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