88 lines
2.4 KiB
Elixir
88 lines
2.4 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2022 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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alias Vix.Vips.Operation
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require Logger
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@cachex Pleroma.Config.get([:cachex, :provider], Cachex)
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def missing_dependencies do
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Enum.reduce([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 {:ok, env} <- HTTP.get(url, [], pool: :media),
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{:ok, resized} <-
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Operation.thumbnail_buffer(env.body, options.max_width,
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height: options.max_height,
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size: :VIPS_SIZE_DOWN
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) do
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if options[:format] == "png" do
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Operation.pngsave_buffer(resized, Q: options[:quality])
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else
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Operation.jpegsave_buffer(resized, Q: options[:quality], interlace: true)
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end
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else
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{:error, _} = error -> error
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end
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end
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# Note: video thumbnail is intentionally not resized (always has original dimensions)
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@spec video_framegrab(String.t()) :: {:ok, binary()} | {:error, any()}
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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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false <- @cachex.exists?(:failed_media_helper_cache, url),
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{:ok, env} <- HTTP.get(url, [], pool: :media),
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{:ok, pid} <- StringIO.open(env.body) do
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body_stream = IO.binstream(pid, 1)
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task =
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Task.async(fn ->
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Exile.stream!(
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[
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executable,
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"-i",
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"pipe:0",
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"-vframes",
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"1",
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"-f",
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"mjpeg",
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"pipe:1"
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],
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input: body_stream,
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ignore_epipe: true,
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stderr: :disable
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)
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|> Enum.into(<<>>)
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end)
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case Task.yield(task, 5_000) do
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nil ->
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Task.shutdown(task)
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@cachex.put(:failed_media_helper_cache, url, nil)
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{:error, {:ffmpeg, :timeout}}
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result ->
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{:ok, result}
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end
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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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end
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