[FFmpeg-devel] [PATCH] avcodec/hevcdec: fix per-frame signaling of color_trc

[Pavel Koshevoy]

This is a partial revert of f2ad6238e4c0e99e2fc131ee14c586e87b045680
It fixes per-frame color_trc signaling of arib-std-b67 frames.

Reproducible with:
ffprobe -show_frames lg_4k_hlg.ts | grep color_transfer=
---
 libavcodec/hevcdec.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
index c1de75abe1..e3d1e3f693 100644
--- a/libavcodec/hevcdec.c
+++ b/libavcodec/hevcdec.c
@@ -2810,6 +2810,12 @@ static int set_side_data(HEVCContext *s)
         s->avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
     }
 
+    if (s->sei.alternative_transfer.present &&
+        av_color_transfer_name(s->sei.alternative_transfer.preferred_transfer_characteristics) &&
+        s->sei.alternative_transfer.preferred_transfer_characteristics != AVCOL_TRC_UNSPECIFIED) {
+        s->avctx->color_trc = out->color_trc = s->sei.alternative_transfer.preferred_transfer_characteristics;
+    }
+
     for (int i = 0; i < s->sei.unregistered.nb_buf_ref; i++) {
         HEVCSEIUnregistered *unreg = &s->sei.unregistered;
 
-- 
2.26.2