[FFmpeg-devel] [PATCH v2 3/9] cbs_vp9: Fill context information for show-existing-frame

[Mark Thompson]

The frame being shown could have different properties to the last-decoded
one.
---
 libavcodec/cbs_vp9.h                 |  3 +++
 libavcodec/cbs_vp9_syntax_template.c | 23 +++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/libavcodec/cbs_vp9.h b/libavcodec/cbs_vp9.h
index 4c9b2f880d..c637c0d346 100644
--- a/libavcodec/cbs_vp9.h
+++ b/libavcodec/cbs_vp9.h
@@ -182,11 +182,14 @@ typedef struct VP9RawSuperframe {
 } VP9RawSuperframe;
 
 typedef struct VP9ReferenceFrameState {
+    int valid;
     int frame_width;    // RefFrameWidth
     int frame_height;   // RefFrameHeight
     int subsampling_x;  // RefSubsamplingX
     int subsampling_y;  // RefSubsamplingY
     int bit_depth;      // RefBitDepth
+    int frame_type;
+    int intra_only;
 } VP9ReferenceFrameState;
 
 typedef struct CodedBitstreamVP9Context {
diff --git a/libavcodec/cbs_vp9_syntax_template.c 
b/libavcodec/cbs_vp9_syntax_template.c
index 898cede329..811f5c12ce 100644
--- a/libavcodec/cbs_vp9_syntax_template.c
+++ b/libavcodec/cbs_vp9_syntax_template.c
@@ -290,10 +290,30 @@ static int 
FUNC(uncompressed_header)(CodedBitstreamContext *ctx, RWContext *rw,
 
     f(1, show_existing_frame);
     if (current->show_existing_frame) {
+        VP9ReferenceFrameState *ref;
+
         f(3, frame_to_show_map_idx);
+        ref = &vp9->ref[current->frame_to_show_map_idx];
+        if (!ref->valid) {
+            av_log(ctx->log_ctx, AV_LOG_ERROR,
+                   "Missing reference frame needed to show existing frame "
+                   "(frame_to_show_map_idx = %d).\n",
+                   current->frame_to_show_map_idx);
+            return AVERROR_INVALIDDATA;
+        }
+
+        vp9->frame_width   = ref->frame_width;
+        vp9->frame_height  = ref->frame_height;
+        vp9->subsampling_x = ref->subsampling_x;
+        vp9->subsampling_y = ref->subsampling_y;
+        vp9->bit_depth     = ref->bit_depth;
+        infer(frame_type, ref->frame_type);
+        infer(intra_only, ref->intra_only);
+
         infer(header_size_in_bytes, 0);
         infer(refresh_frame_flags,  0x00);
         infer(loop_filter_level,    0);
+
         return 0;
     }
 
@@ -374,11 +394,14 @@ static int 
FUNC(uncompressed_header)(CodedBitstreamContext *ctx, RWContext *rw,
     for (i = 0; i < VP9_NUM_REF_FRAMES; i++) {
         if (current->refresh_frame_flags & (1 << i)) {
             vp9->ref[i] = (VP9ReferenceFrameState) {
+                .valid          = 1,
                 .frame_width    = vp9->frame_width,
                 .frame_height   = vp9->frame_height,
                 .subsampling_x  = vp9->subsampling_x,
                 .subsampling_y  = vp9->subsampling_y,
                 .bit_depth      = vp9->bit_depth,
+                .frame_type     = current->frame_type,
+                .intra_only     = current->intra_only,
             };
         }
     }
-- 
2.20.1

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