[Bug 736655] basesink: preroll issue for some clips which audio is shorter than video

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=736655
  GStreamer | gstreamer (core) | 1.2.3

--- Comment #78 from kevin <kevinbing.song at gmail.com> 2015-01-21 09:35:29 UTC ---
So streamsynchronizer unit test should be below:

A pipeline with a sink after streamsynchronizer can change state from
PLAYING->PAUSED->PLAYING in below scenarios:

1. One track reach EOS after pushed some buffers while another track still push
buffer.
2. One track reach EOS without buffer while another track still push buffer.

After the pipeline test， do need below test?

1. Streamsynchronizer sink pad should send GAP event after one track reach EOS
when normal playing.
2. Streamsynchronizer sink pad should send GAP event when state change from
PLAYING to PAUSE after one track reach EOS.
3. Streamsynchronizer sink pad should send EOS event when one track haven't any
data and reach EOS.

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