//暂时只考虑正序播放
private void ProcessTimeLine(float deltaT)
{
m_time += deltaT;
m_lastFrame = m_curFrame;
m_curFrame = Mathf.CeilToInt(m_time * ATimeLine.FRAME_RATE);
//处理跳帧情况（即，因卡顿等原因，一个deltaT时间过长，导致这里的m_curFrame对比上一次结果大于1.)
for (int frame = m_lastFrame; frame <= m_curFrame; ++frame)
{
m_TimelineData.Process(frame);
if (m_TimelineData.CheckIsAllTrackOver())
{
//timeline over, can dispatch event here
}
}
}