struct TrackInfo {
    AString mURL;
    int mRTPSocket;
    int mRTCPSocket;
    bool mUsingInterleavedTCP;
    uint32_t mFirstSeqNumInSegment;
    bool mNewSegment;

    uint32_t mRTPAnchor;
    int64_t mNTPAnchorUs;
    int32_t mTimeScale;
    bool mEOSReceived;

    uint32_t mNormalPlayTimeRTP;
    int64_t mNormalPlayTimeUs;

    sp<APacketSource> mPacketSource;

    // Stores packets temporarily while no notion of time
    // has been established yet.
    List<sp<ABuffer> > mPackets;
};

//一下成员什么意思？如果你知道每个成员的意思，麻烦一并说下，thanks!!!
uint32_t mRTPAnchor;
int64_t mNTPAnchorUs;
int32_t mTimeScale;
bool mEOSReceived;