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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
@cachex Pleroma.Config.get([:cachex, :provider], Cachex)
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)
@spec video_framegrab(String.t()) :: {:ok, binary()} | {:error, any()}
def video_framegrab(url) do
with executable when is_binary(executable) <- System.find_executable("ffmpeg"),
false <- @cachex.exists?(:failed_media_helper_cache, url),
{:ok, env} <- HTTP.get(url, [], pool: :media),
{:ok, pid} <- StringIO.open(env.body) do
body_stream = IO.binstream(pid, 1)
task =
Task.async(fn ->
Exile.stream!(
[
executable,
"-i",
"pipe:0",
"-vframes",
"1",
"-f",
"mjpeg",
"pipe:1"
],
input: body_stream,
ignore_epipe: true,
stderr: :disable
)
|> Enum.into(<<>>)
end)
case Task.yield(task, 5_000) do
nil ->
Task.shutdown(task)
@cachex.put(:failed_media_helper_cache, url, nil)
{:error, {:ffmpeg, :timeout}}
result ->
{:ok, result}
end
else
nil -> {:error, {:ffmpeg, :command_not_found}}
{:error, _} = error -> error
end
end
end

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