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matroskademux: search_cluster should find preceding cluster before target

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... since failing this constraint takes search_pos by surprise which might
then end up in an infinite loop.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=787538
This commit is contained in:
Mark Nauwelaerts 2017-09-11 20:24:27 +02:00
parent 286e1e62be
commit cf3f195012
1 changed files with 11 additions and 3 deletions
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14
gst/matroska/matroska-demux.c
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@ -1703,15 +1703,23 @@ gst_matroska_demux_search_cluster (GstMatroskaDemux * demux, gint64 * pos,
while (1) {
GstByteReader reader;
gint cluster_pos;
guint toread = chunk;
if (!forward)
newpos = MAX (0, newpos - chunk);
if (!forward) {
/* never read beyond the requested target */
if (G_UNLIKELY (newpos < chunk)) {
toread = newpos;
newpos = 0;
} else {
newpos -= chunk;
}
}
if (buf != NULL) {
gst_buffer_unmap (buf, &map);
gst_buffer_unref (buf);
buf = NULL;
}
ret = gst_pad_pull_range (demux->common.sinkpad, newpos, chunk, &buf);
ret = gst_pad_pull_range (demux->common.sinkpad, newpos, toread, &buf);
if (ret != GST_FLOW_OK)
break;
GST_DEBUG_OBJECT (demux,