From 5c27578bce7882d9ecbb1729971589d6593d9984 Mon Sep 17 00:00:00 2001
From: Mark Felder <feld@feld.me>
Date: Thu, 3 Jun 2021 16:58:18 -0500
Subject: [PATCH] Support metadata for video files too

---
 lib/pleroma/application_requirements.ex       |  3 +-
 lib/pleroma/upload/filter/analyze_metadata.ex | 38 +++++++++++++++++++
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/lib/pleroma/application_requirements.ex b/lib/pleroma/application_requirements.ex
index ee6ee9516..a56311a65 100644
--- a/lib/pleroma/application_requirements.ex
+++ b/lib/pleroma/application_requirements.ex
@@ -168,7 +168,8 @@ defp check_system_commands!(:ok) do
       check_filter(Pleroma.Upload.Filter.Mogrify, "mogrify"),
       check_filter(Pleroma.Upload.Filter.Mogrifun, "mogrify"),
       check_filter(Pleroma.Upload.Filter.AnalyzeMetadata, "mogrify"),
-      check_filter(Pleroma.Upload.Filter.AnalyzeMetadata, "convert")
+      check_filter(Pleroma.Upload.Filter.AnalyzeMetadata, "convert"),
+      check_filter(Pleroma.Upload.Filter.AnalyzeMetadata, "ffprobe")
     ]
 
     preview_proxy_commands_status =
diff --git a/lib/pleroma/upload/filter/analyze_metadata.ex b/lib/pleroma/upload/filter/analyze_metadata.ex
index 8c23076d4..c89c30fc1 100644
--- a/lib/pleroma/upload/filter/analyze_metadata.ex
+++ b/lib/pleroma/upload/filter/analyze_metadata.ex
@@ -33,6 +33,23 @@ def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _} = upload)
     end
   end
 
+  def filter(%Pleroma.Upload{tempfile: file, content_type: "video" <> _} = upload) do
+    try do
+      result = media_dimensions(file)
+
+      upload =
+        upload
+        |> Map.put(:width, result.width)
+        |> Map.put(:height, result.height)
+
+      {:ok, :filtered, upload}
+    rescue
+      e in ErlangError ->
+        Logger.warn("#{__MODULE__}: #{inspect(e)}")
+        {:ok, :noop}
+    end
+  end
+
   def filter(_), do: {:ok, :noop}
 
   defp get_blurhash(file) do
@@ -42,4 +59,25 @@ defp get_blurhash(file) do
       _ -> nil
     end
   end
+
+  defp media_dimensions(file) do
+    with executable when is_binary(executable) <- System.find_executable("ffprobe"),
+         args = [
+           "-v",
+           "error",
+           "-show_entries",
+           "stream=width,height",
+           "-of",
+           "csv=p=0:s=x",
+           file
+         ],
+         {result, 0} <- System.cmd(executable, args),
+         [width, height] <-
+           String.split(String.trim(result), "x") |> Enum.map(&String.to_integer(&1)) do
+      %{width: width, height: height}
+    else
+      nil -> {:error, {:ffprobe, :command_not_found}}
+      {:error, _} = error -> error
+    end
+  end
 end