avformat/matroskadec: Fix probing of unknown-length headers
matroska_probe did not support the case of an unknown-length EBML header
at all; given that libavformat's Matroska muxer used to produce such
files in the streaming case, support for them has been added.
Signed-off-by: Andreas Rheinhardt <[email protected]>
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 6eab076..24d3ef2 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1519,9 +1519,14 @@
while (n < size)
total = (total << 8) | p->buf[4 + n++];
- /* Does the probe data contain the whole header? */
- if (p->buf_size < 4 + size + total)
- return 0;
+ if (total + 1 == 1ULL << (7 * size)){
+ /* Unknown-length header - simply parse the whole buffer. */
+ total = p->buf_size - 4 - size;
+ } else {
+ /* Does the probe data contain the whole header? */
+ if (p->buf_size < 4 + size + total)
+ return 0;
+ }
/* The header should contain a known document type. For now,
* we don't parse the whole header but simply check for the
