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   def ffmpeg_resize(uri_or_path, %{max_width: max_width, max_height: max_height}) do
  11     cmd = ~s"""
  12     ffmpeg -i #{uri_or_path} -f lavfi -i color=c=white \
  13       -filter_complex "[0:v] scale='min(#{max_width},iw)':'min(#{max_height},ih)': \
  14         force_original_aspect_ratio=decrease [scaled]; \
  15         [1][scaled] scale2ref [bg][img]; [bg] setsar=1 [bg]; [bg][img] overlay=shortest=1" \
  16       -loglevel quiet -f image2 -vcodec mjpeg -frames:v 1 pipe:1
  17     """
  18
  19     pid = Port.open({:spawn, cmd}, [:use_stdio, :in, :stream, :exit_status, :binary])
  20
  21     receive do
  22       {^pid, {:data, data}} ->
  23         send(pid, {self(), :close})
  24         {:ok, data}
  25
  26       {^pid, {:exit_status, status}} when status > 0 ->
  27         {:error, status}
  28     end
  29   end
  30 end