HTTPBase.h revision 603d739b5a444c52b63f1ec7cd2098034151ad25 
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
56protected:
57    void addBandwidthMeasurement(size_t numBytes, int64_t delayUs);
58
59private:
60    struct BandwidthEntry {
61        int64_t mDelayUs;
62        size_t mNumBytes;
63    };
64
65    Mutex mLock;
66
67    List<BandwidthEntry> mBandwidthHistory;
68    size_t mNumBandwidthHistoryItems;
69    int64_t mTotalTransferTimeUs;
70    size_t mTotalTransferBytes;
71
72    enum {
73        kMinBandwidthCollectFreqMs = 1000,   // 1 second
74        kMaxBandwidthCollectFreqMs = 60000,  // one minute
75    };
76
77    int64_t mPrevBandwidthMeasureTimeUs;
78    int32_t mPrevEstimatedBandWidthKbps;
79    int32_t mBandWidthCollectFreqMs;
80
81    bool mUIDValid;
82    uid_t mUID;
83
84    DISALLOW_EVIL_CONSTRUCTORS(HTTPBase);
85};
86
87}  // namespace android
88
89#endif  // HTTP_BASE_H_
90