[FFmpeg-devel] [PATCH 39/42] avcodec/hevcdec: Move collocated_ref to HEVCContext

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

Only the collocated_ref of the current frame (i.e. HEVCContext.ref)
is ever used*, so move it to HEVCContext directly after ref.

*: This goes so far that collocated_ref was not even synced across
threads in case of frame-threading.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/hevc_mvs.c  | 2 +-
 libavcodec/hevc_refs.c | 5 ++---
 libavcodec/hevcdec.c   | 6 +++---
 libavcodec/hevcdec.h   | 2 +-
 4 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/libavcodec/hevc_mvs.c b/libavcodec/hevc_mvs.c
index c231797a57..0a8cc2c43d 100644
--- a/libavcodec/hevc_mvs.c
+++ b/libavcodec/hevc_mvs.c
@@ -227,7 +227,7 @@ static int temporal_luma_motion_vector(const HEVCContext *s, int x0, int y0,
     int availableFlagLXCol = 0;
     int colPic;
 
-    const HEVCFrame *ref = s->ref->collocated_ref;
+    const HEVCFrame *ref = s->collocated_ref;
 
     if (!ref) {
         memset(mvLXCol, 0, sizeof(*mvLXCol));
diff --git a/libavcodec/hevc_refs.c b/libavcodec/hevc_refs.c
index fa53b273c7..9cdc4233df 100644
--- a/libavcodec/hevc_refs.c
+++ b/libavcodec/hevc_refs.c
@@ -49,8 +49,6 @@ void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags)
         ff_refstruct_unref(&frame->rpl_tab);
         frame->refPicList = NULL;
 
-        frame->collocated_ref = NULL;
-
         ff_refstruct_unref(&frame->hwaccel_picture_private);
     }
 }
@@ -152,6 +150,7 @@ int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc)
 
     *frame = ref->frame;
     s->ref = ref;
+    s->collocated_ref = NULL;
 
     if (s->sh.pic_output_flag)
         ref->flags = HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_SHORT_REF;
@@ -383,7 +382,7 @@ int ff_hevc_slice_rpl(HEVCContext *s)
 
         if (sh->collocated_list == list_idx &&
             sh->collocated_ref_idx < rpl->nb_refs)
-            s->ref->collocated_ref = rpl->ref[sh->collocated_ref_idx];
+            s->collocated_ref = rpl->ref[sh->collocated_ref_idx];
     }
 
     return 0;
diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
index c8067a736e..a476a7c7ce 100644
--- a/libavcodec/hevcdec.c
+++ b/libavcodec/hevcdec.c
@@ -2910,7 +2910,7 @@ static int hevc_frame_start(HEVCContext *s)
 fail:
     if (s->ref)
         ff_hevc_unref_frame(s, s->ref, ~0);
-    s->ref = NULL;
+    s->ref = s->collocated_ref = NULL;
     return ret;
 }
 
@@ -3131,7 +3131,7 @@ static int decode_nal_units(HEVCContext *s, const uint8_t *buf, int length)
     int i, ret = 0;
     int eos_at_start = 1;
 
-    s->ref = NULL;
+    s->ref = s->collocated_ref = NULL;
     s->last_eos = s->eos;
     s->eos = 0;
     s->overlap = 0;
@@ -3339,7 +3339,7 @@ static int hevc_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
     if (sd && sd_size > 0)
         ff_dovi_update_cfg(&s->dovi_ctx, (AVDOVIDecoderConfigurationRecord *) sd);
 
-    s->ref = NULL;
+    s->ref = s->collocated_ref = NULL;
     ret    = decode_nal_units(s, avpkt->data, avpkt->size);
     if (ret < 0)
         return ret;
diff --git a/libavcodec/hevcdec.h b/libavcodec/hevcdec.h
index edf2f188cf..bed8716f99 100644
--- a/libavcodec/hevcdec.h
+++ b/libavcodec/hevcdec.h
@@ -413,7 +413,6 @@ typedef struct HEVCFrame {
     RefPicListTab **rpl_tab;       ///< RefStruct reference
     int ctb_count;
     int poc;
-    struct HEVCFrame *collocated_ref;
 
     RefPicListTab *rpl;            ///< RefStruct reference
     int nb_rpl_elems;
@@ -527,6 +526,7 @@ typedef struct HEVCContext {
     enum HEVCNALUnitType nal_unit_type;
     int temporal_id;  ///< temporal_id_plus1 - 1
     HEVCFrame *ref;
+    HEVCFrame *collocated_ref;
     HEVCFrame DPB[32];
     int poc;
     int pocTid0;
-- 
2.34.1

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