avcodec/decode: Make post_process_opaque a RefStruct reference

Avoids the post_process_opaque_free callback; the only user of
this is already a RefStruct reference and presumably other users
would want to use a pool for this, too, so they would use
RefStruct-objects, too.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/decode.c

@@ -1676,8 +1676,7 @@ static void decode_data_free(AVRefStructOpaque unused, void *obj)
 {
     FrameDecodeData *fdd = obj;
 
-    if (fdd->post_process_opaque_free)
-        fdd->post_process_opaque_free(fdd->post_process_opaque);
+    av_refstruct_unref(&fdd->post_process_opaque);
 
     if (fdd->hwaccel_priv_free)
         fdd->hwaccel_priv_free(fdd->hwaccel_priv);
@@ -1748,7 +1747,6 @@ int ff_attach_decode_data(AVCodecContext *avctx, AVFrame *frame)
         validate_avframe_allocation(avctx, frame_ctx->frame);
 
         fdd->post_process_opaque = frame_ctx;
-        fdd->post_process_opaque_free = ff_lcevc_unref;
         fdd->post_process = ff_lcevc_process;
     }
     dc->lcevc.frame = 0;

libavcodec/decode.h

@@ -42,8 +42,7 @@ typedef struct FrameDecodeData {
      * stored in the post_process_opaque object.
      */
     int (*post_process)(void *logctx, AVFrame *frame);
-    void *post_process_opaque;
-    void (*post_process_opaque_free)(void *opaque);
+    void *post_process_opaque;                        ///< RefStruct reference
 
     /**
      * Per-frame private data for hwaccels.

libavcodec/lcevcdec.c

@@ -464,9 +464,3 @@ fail:
     av_refstruct_unref(&lcevc);
     return ret;
 }
-
-void ff_lcevc_unref(void *opaque)
-{
-    FFLCEVCFrame *lcevc = opaque;
-    av_refstruct_unref(&lcevc);
-}

libavcodec/lcevcdec.h

@@ -50,5 +50,5 @@ int ff_lcevc_alloc(FFLCEVCContext **plcevc, void *logctx);
 int ff_lcevc_process(void *logctx, struct AVFrame *frame);
 int ff_lcevc_parse_frame(FFLCEVCContext *lcevc, const struct AVFrame *frame,
                          enum AVPixelFormat *format, int *width, int *height, void *logctx);
-void ff_lcevc_unref(void *opaque);
+
 #endif /* AVCODEC_LCEVCDEC_H */