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Nicolas Dufresne authored
Currently there is no other way to unlock a buffer pool other then stopping it. This may have the effect of freeing all the buffers, which is too heavy for a seek. This patch add a method to enter and leave flushing state. As a convenience, flush_start/flush_stop virtual are added so pool implementation can also unblock their own internal poll atomically with the rest of the pool. This is fully backward compatible with doing stop/start to actually flush the pool (as being done in GstBaseSrc). https://bugzilla.gnome.org/show_bug.cgi?id=727611
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