HTTPBase.h revision dab718bba3945332dc75e268e1e7f0fe2eb91c4a 
1/*
2 * Copyright (C) 2011 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 HTTP_BASE_H_
18
19#define HTTP_BASE_H_
20
21#include <media/stagefright/foundation/ABase.h>
22#include <media/stagefright/DataSource.h>
23#include <media/stagefright/MediaErrors.h>
24#include <utils/threads.h>
25
26namespace android {
27
28struct HTTPBase : public DataSource {
29    enum Flags {
30        // Don't log any URLs.
31        kFlagIncognito = 1
32    };
33
34    HTTPBase();
35
36    virtual status_t connect(
37            const char *uri,
38            const KeyedVector<String8, String8> *headers = NULL,
39            off64_t offset = 0) = 0;
40
41    virtual void disconnect() = 0;
42
43    // Returns true if bandwidth could successfully be estimated,
44    // false otherwise.
45    virtual bool estimateBandwidth(int32_t *bandwidth_bps);
46
47    virtual status_t getEstimatedBandwidthKbps(int32_t *kbps);
48
49    virtual status_t setBandwidthStatCollectFreq(int32_t freqMs);
50
51    void setUID(uid_t uid);
52    bool getUID(uid_t *uid) const;
53
54    static sp<HTTPBase> Create(uint32_t flags = 0);
55
56    static void RegisterSocketUser(int s, uid_t uid);
57
58protected:
59    void addBandwidthMeasurement(size_t numBytes, int64_t delayUs);
60
61private:
62    struct BandwidthEntry {
63        int64_t mDelayUs;
64        size_t mNumBytes;
65    };
66
67    Mutex mLock;
68
69    List<BandwidthEntry> mBandwidthHistory;
70    size_t mNumBandwidthHistoryItems;
71    int64_t mTotalTransferTimeUs;
72    size_t mTotalTransferBytes;
73
74    enum {
75        kMinBandwidthCollectFreqMs = 1000,   // 1 second
76        kMaxBandwidthCollectFreqMs = 60000,  // one minute
77    };
78
79    int64_t mPrevBandwidthMeasureTimeUs;
80    int32_t mPrevEstimatedBandWidthKbps;
81    int32_t mBandWidthCollectFreqMs;
82
83    bool mUIDValid;
84    uid_t mUID;
85
86    DISALLOW_EVIL_CONSTRUCTORS(HTTPBase);
87};
88
89}  // namespace android
90
91#endif  // HTTP_BASE_H_
92