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oggdemux: fix seeking with negative rate with skeleton
Files with a skeleton, or other files with a stream that ends before the end of the chain would start playing from the end of the chain when trying to seek with a negative rate at a position between the end of any stream and the end of the chain. This is due to the loop in _do_seek() assuming that pages will be encountered for all streams shortly after the place where we want to seek, as found by do_binary_search(). In the first iteration of the loop, stream ends are now checked against the time of the current page.
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@ -2050,6 +2050,7 @@ gst_ogg_demux_do_seek (GstOggDemux * ogg, GstSegment * segment,
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gint64 result = 0;
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GstFlowReturn ret;
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gint i, pending, len;
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gboolean first_parsed_page = TRUE;
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position = segment->last_stop;
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@ -2114,6 +2115,32 @@ gst_ogg_demux_do_seek (GstOggDemux * ogg, GstSegment * segment,
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continue;
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}
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/* we only do this the first time we pass here */
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if (first_parsed_page) {
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/* Now that we have a time reference from the page, we can check
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* whether all streams still have pages from here on.
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*
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* This would be more elegant before the loop, but getting the page from
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* there without breaking anything would be more costly */
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granule_time = gst_ogg_stream_get_end_time_for_granulepos (&pad->map,
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granulepos);
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for (i = 0; i < len; i++) {
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GstOggPad *stream = g_array_index (chain->streams, GstOggPad *, i);
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if (stream == pad)
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/* we already know we have at least one page (the current one)
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* for this stream */
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continue;
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if (granule_time > stream->map.total_time)
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/* we won't encounter any more pages of this stream, so we don't
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* try finding a key frame for it */
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pending--;
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}
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first_parsed_page = FALSE;
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}
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/* in reverse we want to go past the page with the lower timestamp */
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if (segment->rate < 0.0) {
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/* get time for this pad */
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