WIP: aacparse: Estimate buffer timestamp when missing
Copied from https://gitlab.freedesktop.org//gstreamer/gst-plugins-good/-/merge_requests/733
Estimate it from frame_samples and sample_rate.
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Copied from https://gitlab.freedesktop.org//gstreamer/gst-plugins-good/-/merge_requests/733
Estimate it from frame_samples and sample_rate.