[FFmpeg-devel] [PATCH 1/6] av1dec: Add force_integer_mv derived field for decoder use

[Mark Thompson <sw@jkqxz.net>]

This is not the same as the syntax element value in the frame header
because the specification parsing tables override the value on intra
frames.
---
On 27/04/2024 15:58, Lynne wrote:
> This looks better to me.

HYG.

Of these, only VAAPI tested.  (And probably it never did anything anyway.)

 libavcodec/av1dec.c | 7 +++++++
 libavcodec/av1dec.h | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/libavcodec/av1dec.c b/libavcodec/av1dec.c
index 79a30a114d..601e3f05e1 100644
--- a/libavcodec/av1dec.c
+++ b/libavcodec/av1dec.c
@@ -725,6 +725,8 @@ static void av1_frame_replace(AV1Frame *dst, const AV1Frame *src)
            sizeof(dst->ref_frame_sign_bias));
     memcpy(dst->order_hints, src->order_hints,
            sizeof(dst->order_hints));
+
+    dst->force_integer_mv = src->force_integer_mv;
 }
 
 static av_cold int av1_decode_free(AVCodecContext *avctx)
@@ -1255,6 +1257,11 @@ static int get_current_frame(AVCodecContext *avctx)
     order_hint_info(s);
     load_grain_params(s);
 
+    s->cur_frame.force_integer_mv =
+        s->raw_frame_header->force_integer_mv ||
+        s->raw_frame_header->frame_type == AV1_FRAME_KEY ||
+        s->raw_frame_header->frame_type == AV1_FRAME_INTRA_ONLY;
+
     return ret;
 }
 
diff --git a/libavcodec/av1dec.h b/libavcodec/av1dec.h
index 66a732d781..8b2a7b0896 100644
--- a/libavcodec/av1dec.h
+++ b/libavcodec/av1dec.h
@@ -67,6 +67,12 @@ typedef struct AV1Frame {
     // OrderHints[] when this is the current frame, otherwise
     // SavedOrderHints[s][] when is the reference frame in slot s.
     uint8_t order_hints[AV1_TOTAL_REFS_PER_FRAME];
+
+    // force_integer_mv value at the end of the frame header parsing.
+    // This is not the same as the syntax element value in
+    // raw_frame_header because the specification parsing tables
+    // override the value on intra frames.
+    uint8_t force_integer_mv;
 } AV1Frame;
 
 typedef struct TileGroupInfo {
-- 
2.43.0

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