Previously, when we encountered a hole (a gap in the page sequence
numbers), we would save off all of the packets from the first page
after the hole, but not timestamp them.
That meant when they were actually decoded, op_pcm_tell() would
report a timestamp of 0 until reaching the last packet on that
Instead, handle holes just like a raw seek.
We reset the granule position tracking, and attempt to timestamp
packets backwards from the end of the page.
If the first page after the hole is an EOS page, we just throw it
away (rather than risk playing invalid samples due to incorrect
We also throw away the first 80 ms of audio after a hole, to allow
the decoder state to reconverge.
This patch also updates the example to report the hole and
continue decoding, rather than immediately stopping when a hole is
encountered, in order to test the above features.