163 lines
3.8 KiB
Elixir
163 lines
3.8 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Helpers.MediaHelper do
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@moduledoc """
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Handles common media-related operations.
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"""
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alias Pleroma.HTTP
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require Logger
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def missing_dependencies do
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Enum.reduce([imagemagick: "convert", ffmpeg: "ffmpeg"], [], fn {sym, executable}, acc ->
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if Pleroma.Utils.command_available?(executable) do
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acc
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else
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[sym | acc]
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end
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end)
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end
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def image_resize(url, options) do
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with executable when is_binary(executable) <- System.find_executable("convert"),
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{:ok, args} <- prepare_image_resize_args(options),
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{:ok, env} <- HTTP.get(url, [], pool: :media),
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{:ok, fifo_path} <- mkfifo() do
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args = List.flatten([fifo_path, args])
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run_fifo(fifo_path, env, executable, args)
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else
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nil -> {:error, {:convert, :command_not_found}}
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{:error, _} = error -> error
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end
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end
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defp prepare_image_resize_args(
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%{max_width: max_width, max_height: max_height, format: "png"} = options
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) do
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quality = options[:quality] || 85
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resize = Enum.join([max_width, "x", max_height, ">"])
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args = [
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"-resize",
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resize,
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"-quality",
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to_string(quality),
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"png:-"
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]
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{:ok, args}
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end
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defp prepare_image_resize_args(%{max_width: max_width, max_height: max_height} = options) do
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quality = options[:quality] || 85
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resize = Enum.join([max_width, "x", max_height, ">"])
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args = [
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"-interlace",
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"Plane",
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"-resize",
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resize,
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"-quality",
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to_string(quality),
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"jpg:-"
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]
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{:ok, args}
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end
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defp prepare_image_resize_args(_), do: {:error, :missing_options}
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# Note: video thumbnail is intentionally not resized (always has original dimensions)
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def video_framegrab(url) do
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with executable when is_binary(executable) <- System.find_executable("ffmpeg"),
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{:ok, env} <- HTTP.get(url, [], pool: :media),
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{:ok, fifo_path} <- mkfifo(),
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args = [
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"-y",
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"-i",
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fifo_path,
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"-vframes",
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"1",
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"-f",
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"mjpeg",
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"-loglevel",
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"error",
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"-"
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] do
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run_fifo(fifo_path, env, executable, args)
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else
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nil -> {:error, {:ffmpeg, :command_not_found}}
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{:error, _} = error -> error
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end
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end
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defp run_fifo(fifo_path, env, executable, args) do
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pid =
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Port.open({:spawn_executable, executable}, [
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:use_stdio,
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:stream,
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:exit_status,
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:binary,
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args: args
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])
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fifo = Port.open(to_charlist(fifo_path), [:eof, :binary, :stream, :out])
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fix = Pleroma.Helpers.QtFastStart.fix(env.body)
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true = Port.command(fifo, fix)
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:erlang.port_close(fifo)
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loop_recv(pid)
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after
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File.rm(fifo_path)
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end
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defp mkfifo do
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path = Path.join(System.tmp_dir!(), "pleroma-media-preview-pipe-#{Ecto.UUID.generate()}")
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case System.cmd("mkfifo", [path]) do
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{_, 0} ->
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spawn(fifo_guard(path))
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{:ok, path}
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{_, err} ->
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{:error, {:fifo_failed, err}}
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end
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end
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defp fifo_guard(path) do
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pid = self()
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fn ->
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ref = Process.monitor(pid)
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receive do
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{:DOWN, ^ref, :process, ^pid, _} ->
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File.rm(path)
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end
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end
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end
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defp loop_recv(pid) do
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loop_recv(pid, <<>>)
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end
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defp loop_recv(pid, acc) do
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receive do
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{^pid, {:data, data}} ->
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loop_recv(pid, acc <> data)
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{^pid, {:exit_status, 0}} ->
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{:ok, acc}
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{^pid, {:exit_status, status}} ->
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{:error, status}
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after
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5000 ->
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:erlang.port_close(pid)
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{:error, :timeout}
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end
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end
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end
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