[MSE][GStreamer] don't push samples while seeking #1528
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MediaSource::waitForTarget completes asynchronously. Even when the target time is already buffered, it still enqueues a task to compute seek time on next event loop cycle. This can lead to SourceBuffer providing media data for incorrect time, after GStreamer seek already flushed the source. For example this happens if TrackQueue::LowLevelHandler callback was posted just before the seek. The proposed change implements SourceBufferPrivate::isSeeking() that returns true until MSE seek is completed, effectivly blocking SourceBufferPrivate::provideMediaData during the seek.
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MediaSource::waitForTarget completes asynchronously. Even when the target time is already buffered, it still enqueues a task to compute seek time on next event loop cycle. This can lead to SourceBuffer providing media data for incorrect time, after GStreamer seek already flushed the source. For example this happens if
TrackQueue::LowLevelHandler callback was posted just before the seek.
The proposed change implements SourceBufferPrivate::isSeeking() that returns true until MSE seek is completed, effectivly blocking SourceBufferPrivate::provideMediaData during the seek.