avcodec/cuviddec: properly take deinterlacing and display delay into account for buffer_full check

Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>

libavcodec/cuvid.c

@@ -373,7 +373,11 @@ static int cuvid_is_buffer_full(AVCodecContext *avctx)
 {
     CuvidContext *ctx = avctx->priv_data;
 
-    return (av_fifo_size(ctx->frame_queue) / sizeof(CuvidParsedFrame)) + 2 > ctx->nb_surfaces;
+    int delay = ctx->cuparseinfo.ulMaxDisplayDelay;
+    if (ctx->deint_mode != cudaVideoDeinterlaceMode_Weave && !ctx->drop_second_field)
+        delay *= 2;
+
+    return (av_fifo_size(ctx->frame_queue) / sizeof(CuvidParsedFrame)) + delay >= ctx->nb_surfaces;
 }
 
 static int cuvid_decode_packet(AVCodecContext *avctx, const AVPacket *avpkt)