media_helper.ex
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media_helper.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Helpers.MediaHelper do
	@moduledoc """
	Handles common media-related operations.
	"""

	alias Pleroma.HTTP
	alias Vix.Vips.Operation

	require Logger

	def missing_dependencies do
	Enum.reduce([ffmpeg: "ffmpeg"], [], fn {sym, executable}, acc ->
	if Pleroma.Utils.command_available?(executable) do
	acc
	else
	[sym \| acc]
	end
	end)
	end

	def image_resize(url, options) do
	with {:ok, env} <- HTTP.get(url, [], pool: :media),
	{:ok, resized} <-
	Operation.thumbnail_buffer(env.body, options.max_width,
	height: options.max_height,
	size: :VIPS_SIZE_DOWN
	) do
	if options[:format] == "png" do
	Operation.pngsave_buffer(resized, Q: options[:quality])
	else
	Operation.jpegsave_buffer(resized, Q: options[:quality], interlace: true)
	end
	else
	{:error, _} = error -> error
	end
	end

	# Note: video thumbnail is intentionally not resized (always has original dimensions)
	def video_framegrab(url) do
	with executable when is_binary(executable) <- System.find_executable("ffmpeg"),
	{:ok, env} <- HTTP.get(url, [], pool: :media),
	{:ok, pid} <- StringIO.open(env.body) do
	body_stream = IO.binstream(pid, 1)

	Exile.stream!(
	[
	executable,
	"-i",
	"pipe:0",
	"-vframes",
	"1",
	"-f",
	"mjpeg",
	"pipe:1"
	],
	input: body_stream,
	ignore_epipe: true,
	stderr: :disable
	)
	\|> Enum.into(<<>>)
	else
	nil -> {:error, {:ffmpeg, :command_not_found}}
	{:error, _} = error -> error
	end
	end
	end