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From: toqsxw@gmail.com
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To: ffmpeg-devel@ffmpeg.org
Date: Wed, 2 Apr 2025 01:16:09 +0800
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Subject: [FFmpeg-devel] [PATCH v1 12/19] avcodec/vvc/sei: add
decode_display_orientation
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Cc: Wu Jianhua <toqsxw@outlook.com>
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From: Wu Jianhua <toqsxw@outlook.com>
Signed-off-by: Wu Jianhua <toqsxw@outlook.com>
---
libavcodec/vvc/sei.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/libavcodec/vvc/sei.c b/libavcodec/vvc/sei.c
index c955d9921f..6f918d114c 100644
--- a/libavcodec/vvc/sei.c
+++ b/libavcodec/vvc/sei.c
@@ -94,6 +94,30 @@ static int decode_decoded_picture_hash(H274SEIPictureHash *h, const SEIRawDecode
return 0;
}
+static int decode_display_orientation(H2645SEIDisplayOrientation *h, const SEIRawDisplayOrientation *s)
+{
+ int degrees[] = { 0, 0x8000, 0x4000, 0xC000 };
+
+ h->present = !s->display_orientation_cancel_flag;
+ if (h->present) {
+ if (s->display_orientation_transform_type > 7)
+ return AVERROR_INVALIDDATA;
+
+ h->vflip = 0;
+ if (s->display_orientation_transform_type == 1 ||
+ s->display_orientation_transform_type == 3 ||
+ s->display_orientation_transform_type == 4 ||
+ s->display_orientation_transform_type == 6) {
+ h->hflip = 1;
+ } else {
+ h->hflip = 0;
+ }
+ h->anticlockwise_rotation = degrees[s->display_orientation_transform_type >> 1];
+ }
+
+ return 0;
+}
+
int ff_vvc_sei_decode(VVCSEI *s, const H266RawSEI *sei, const struct VVCFrameContext *fc)
{
H2645SEI *c = &s->common;
@@ -116,6 +140,9 @@ int ff_vvc_sei_decode(VVCSEI *s, const H266RawSEI *sei, const struct VVCFrameCon
case SEI_TYPE_DECODED_PICTURE_HASH:
return decode_decoded_picture_hash(&s->picture_hash, payload);
+ case SEI_TYPE_DISPLAY_ORIENTATION:
+ return decode_display_orientation(&s->common.display_orientation, payload);
+
default:
av_log(fc->log_ctx, AV_LOG_DEBUG, "Skipped %s SEI %d\n",
sei->nal_unit_header.nal_unit_type == VVC_PREFIX_SEI_NUT ?
--
2.44.0.windows.1
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