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See gstreamer/gst-plugins-base#771 for context. This exposes new API that subclasses must call from their aggregate() implementation to signal that they have selected the next samples they will aggregate: gst_aggregator_selected_samples() GstAggregator will emit a new signal there, `samples-selected`, handlers can then look up samples per pad with the newly-added gst_aggregator_peek_next_sample. In addition, a new FIXME is logged when subclasses haven't actually called `selected_samples` from their aggregate() implementation. Part-of: <gstreamer/gstreamer!549>
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