Gradualizer fix for Membrane.Element.RTP.H264.FU

fu.ex.do_parse_spec.diff

diff --git a/lib/rtp_h264/nal_formats/fu.ex b/lib/rtp_h264/nal_formats/fu.ex
index 873cf26..3811210 100644
--- a/lib/rtp_h264/nal_formats/fu.ex
+++ b/lib/rtp_h264/nal_formats/fu.ex
@@ -29,12 +29,25 @@ defmodule Membrane.Element.RTP.H264.FU do
           | {:error, :packet_malformed | :invalid_first_packet}
           | {:incomplete, t()}
   def parse(data, seq_num, acc) do
-    # actual code
-    data
-    |> Header.parse()
-    ~>> ({:ok, {header, value}} -> do_parse(header, value, seq_num, acc))
+    ## actual code
+    #data
+    #|> Header.parse()
+    #~>> ({:ok, {header, value}} -> do_parse(header, value, seq_num, acc))
+
+    # expanded
+    case Membrane.Element.RTP.H264.FU.Header.parse(data) do
+      {:ok, {header, value}} ->
+        do_parse(header, value, seq_num, acc)
+
+      {:error, _} = e ->
+        e
+    end
   end
 
+  @spec do_parse(%Header{}, binary(), Depayloader.sequence_number(), t())
+	 :: {:ok, {binary(), NALHeader.type()}}
+      | {:error, :packet_malformed | :invalid_first_packet}
+      | {:incomplete, t()}
   defp do_parse(header, data, seq_num, acc)
 
   defp do_parse(%Header{end_bit: true, type: type}, data, seq_num, %__MODULE__{

fu.ex.fix.diff

diff --git a/lib/rtp_h264/nal_formats/fu.ex b/lib/rtp_h264/nal_formats/fu.ex
index 873cf26..d314a10 100644
--- a/lib/rtp_h264/nal_formats/fu.ex
+++ b/lib/rtp_h264/nal_formats/fu.ex
@@ -29,10 +29,19 @@ defmodule Membrane.Element.RTP.H264.FU do
           | {:error, :packet_malformed | :invalid_first_packet}
           | {:incomplete, t()}
   def parse(data, seq_num, acc) do
-    # actual code
-    data
-    |> Header.parse()
-    ~>> ({:ok, {header, value}} -> do_parse(header, value, seq_num, acc))
+    ## actual code
+    #data
+    #|> Header.parse()
+    #~>> ({:ok, {header, value}} -> do_parse(header, value, seq_num, acc))
+
+    # expanded
+    case Membrane.Element.RTP.H264.FU.Header.parse(data) do
+      {:ok, {header, value}} ->
+        do_parse(header, value, seq_num, acc)
+
+      {:error, _} = e ->
+        e
+    end
   end
 
   defp do_parse(header, data, seq_num, acc)