On 4/18/2024 5:26 PM, Frank Plowman wrote:
The native VVC decoder does not yet support quality/spatial/multiview
scalability. Bitstreams requiring this feature could cause crashes.
Patch fixes this by skipping NAL units which are not in the base layer,
warning the user while doing so.
Signed-off-by: Frank Plowman <p...@frankplowman.com>
---
Changes since v1:
* Change missing feature string from "Multilayer" to "Decoding of
multilayer bitstreams" for clarity.
libavcodec/vvc/dec.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libavcodec/vvc/dec.c b/libavcodec/vvc/dec.c
index a4fc40b40a..6aeec27eaf 100644
--- a/libavcodec/vvc/dec.c
+++ b/libavcodec/vvc/dec.c
@@ -785,6 +785,12 @@ static int decode_nal_unit(VVCContext *s, VVCFrameContext
*fc, const H2645NAL *n
s->temporal_id = nal->temporal_id;
+ if (nal->nuh_layer_id > 0) {
+ avpriv_report_missing_feature(fc->log_ctx,
+ "Decoding of multilayer bitstreams");
+ return AVERROR_PATCHWELCOME;
+ }
+
switch (unit->type) {
case VVC_VPS_NUT:
case VVC_SPS_NUT:
Applied, thanks.
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