Home | History | Annotate | Download | only in include 
      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 LIVE_SESSION_H_
     18 
     19 #define LIVE_SESSION_H_
     20 
     21 #include <media/stagefright/foundation/AHandler.h>
     22 
     23 #include <utils/String8.h>
     24 
     25 namespace android {
     26 
     27 struct ABuffer;
     28 struct DataSource;
     29 struct LiveDataSource;
     30 struct M3UParser;
     31 struct HTTPBase;
     32 
     33 struct LiveSession : public AHandler {
     34     enum Flags {
     35         // Don't log any URLs.
     36         kFlagIncognito = 1,
     37     };
     38     LiveSession(uint32_t flags = 0, bool uidValid = false, uid_t uid = 0);
     39 
     40     sp<DataSource> getDataSource();
     41 
     42     void connect(
     43             const char *url,
     44             const KeyedVector<String8, String8> *headers = NULL);
     45 
     46     void disconnect();
     47 
     48     // Blocks until seek is complete.
     49     void seekTo(int64_t timeUs);
     50 
     51     status_t getDuration(int64_t *durationUs);
     52     bool isSeekable();
     53 
     54 protected:
     55     virtual ~LiveSession();
     56 
     57     virtual void onMessageReceived(const sp<AMessage> &msg);
     58 
     59 private:
     60     enum {
     61         kMaxNumQueuedFragments = 3,
     62         kMaxNumRetries         = 5,
     63     };
     64 
     65     enum {
     66         kWhatConnect        = 'conn',
     67         kWhatDisconnect     = 'disc',
     68         kWhatMonitorQueue   = 'moni',
     69         kWhatSeek           = 'seek',
     70     };
     71 
     72     struct BandwidthItem {
     73         AString mURI;
     74         unsigned long mBandwidth;
     75     };
     76 
     77     uint32_t mFlags;
     78     bool mUIDValid;
     79     uid_t mUID;
     80 
     81     sp<LiveDataSource> mDataSource;
     82 
     83     sp<HTTPBase> mHTTPDataSource;
     84 
     85     AString mMasterURL;
     86     KeyedVector<String8, String8> mExtraHeaders;
     87 
     88     Vector<BandwidthItem> mBandwidthItems;
     89 
     90     KeyedVector<AString, sp<ABuffer> > mAESKeyForURI;
     91 
     92     ssize_t mPrevBandwidthIndex;
     93     int64_t mLastPlaylistFetchTimeUs;
     94     sp<M3UParser> mPlaylist;
     95     int32_t mSeqNumber;
     96     int64_t mSeekTimeUs;
     97     int32_t mNumRetries;
     98 
     99     Mutex mLock;
    100     Condition mCondition;
    101     int64_t mDurationUs;
    102     bool mSeekDone;
    103     bool mDisconnectPending;
    104 
    105     int32_t mMonitorQueueGeneration;
    106 
    107     enum RefreshState {
    108         INITIAL_MINIMUM_RELOAD_DELAY,
    109         FIRST_UNCHANGED_RELOAD_ATTEMPT,
    110         SECOND_UNCHANGED_RELOAD_ATTEMPT,
    111         THIRD_UNCHANGED_RELOAD_ATTEMPT
    112     };
    113     RefreshState mRefreshState;
    114 
    115     uint8_t mPlaylistHash[16];
    116 
    117     void onConnect(const sp<AMessage> &msg);
    118     void onDisconnect();
    119     void onDownloadNext();
    120     void onMonitorQueue();
    121     void onSeek(const sp<AMessage> &msg);
    122 
    123     status_t fetchFile(
    124             const char *url, sp<ABuffer> *out,
    125             int64_t range_offset = 0, int64_t range_length = -1);
    126 
    127     sp<M3UParser> fetchPlaylist(const char *url, bool *unchanged);
    128     size_t getBandwidthIndex();
    129 
    130     status_t decryptBuffer(
    131             size_t playlistIndex, const sp<ABuffer> &buffer);
    132 
    133     void postMonitorQueue(int64_t delayUs = 0);
    134 
    135     bool timeToRefreshPlaylist(int64_t nowUs) const;
    136 
    137     static int SortByBandwidth(const BandwidthItem *, const BandwidthItem *);
    138 
    139     DISALLOW_EVIL_CONSTRUCTORS(LiveSession);
    140 };
    141 
    142 }  // namespace android
    143 
    144 #endif  // LIVE_SESSION_H_
    145