git.squeep.com Git - akkoma/blob - lib/pleroma/helpers/media_helper.ex

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Helpers.MediaHelper do
   6   @moduledoc """
   7   Handles common media-related operations.
   8   """
   9
  10   @ffmpeg_opts [{:sync, true}, {:stdout, true}]
  11
  12   def ffmpeg_resize_remote(uri, %{max_width: max_width, max_height: max_height}) do
  13     cmd = ~s"""
  14     curl -L "#{uri}" |
  15     ffmpeg -i pipe:0 -f lavfi -i color=c=white \
  16       -filter_complex "[0:v] scale='min(#{max_width},iw)':'min(#{max_height},ih)': \
  17         force_original_aspect_ratio=decrease [scaled]; \
  18         [1][scaled] scale2ref [bg][img]; [bg] setsar=1 [bg]; [bg][img] overlay=shortest=1" \
  19       -f image2 -vcodec mjpeg -frames:v 1 pipe:1 | \
  20     cat
  21     """
  22
  23     with {:ok, [stdout: stdout_list]} <- Exexec.run(cmd, @ffmpeg_opts) do
  24       {:ok, Enum.join(stdout_list)}
  25     end
  26   end
  27 end