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
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 void getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client);
47    virtual String8 getUri();
48
49    virtual String8 getMIMEType() const;
50
51    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
73protected:
74    virtual ~NuCachedSource2();
75
76private:
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