[FFmpeg-devel] [PATCH] avcodec/hevcdec: decode at most one slice reporting being the first in the picture
James Almer
jamrial at gmail.com
Mon Mar 18 22:31:53 EET 2019
Fixes deadlocks when decoding packets containing more than one of the aforementioned
slices when using frame threads.
Signed-off-by: James Almer <jamrial at gmail.com>
---
See the discussion in the http://ffmpeg.org/pipermail/ffmpeg-devel/2019-March/241192.html
thread.
Alternative fixes that don't discard the second slice in this scenario welcome.
libavcodec/hevcdec.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
index 967f8f1def..86adab0ae1 100644
--- a/libavcodec/hevcdec.c
+++ b/libavcodec/hevcdec.c
@@ -2927,6 +2927,10 @@ static int decode_nal_unit(HEVCContext *s, const H2645NAL *nal)
}
if (s->sh.first_slice_in_pic_flag) {
+ if (s->ref) {
+ av_log(s->avctx, AV_LOG_ERROR, "Two slices reporting being the first in the same frame.\n");
+ goto fail;
+ }
if (s->max_ra == INT_MAX) {
if (s->nal_unit_type == HEVC_NAL_CRA_NUT || IS_BLA(s)) {
s->max_ra = s->poc;
--
2.21.0
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