akkoma/lib/pleroma/helpers/media_helper.ex

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Helpers.MediaHelper do
@moduledoc """
Handles common media-related operations.
"""
def ffmpeg_resize(uri_or_path, %{max_width: max_width, max_height: max_height} = options) do
quality = options[:quality] || 1
cmd = ~s"""
ffmpeg -i #{uri_or_path} -f lavfi -i color=c=white \
-filter_complex "[0:v] scale='min(#{max_width},iw)':'min(#{max_height},ih)': \
force_original_aspect_ratio=decrease [scaled]; \
[1][scaled] scale2ref [bg][img]; [bg] setsar=1 [bg]; [bg][img] overlay=shortest=1" \
-loglevel quiet -f image2 -vcodec mjpeg -frames:v 1 -q:v #{quality} pipe:1
"""
pid = Port.open({:spawn, cmd}, [:use_stdio, :in, :stream, :exit_status, :binary])
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loop_recv(pid)
end
defp loop_recv(pid) do
loop_recv(pid, <<>>)
end
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defp loop_recv(pid, acc) do
receive do
{^pid, {:data, data}} ->
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loop_recv(pid, acc <> data)
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{^pid, {:exit_status, 0}} ->
{:ok, acc}
{^pid, {:exit_status, status}} ->
{:error, status}
end
end
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end