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require 'tempfile'
require 'tty/command'
module Kithe
# Determines MIME/Internet Content Type by calling out to `mediainfo` CLI, which
# must be installed on machine.
#
# Catches some A/v types that for some fles ordinary "magic byte" detection does not.
#
# When we had some files not being properly determined to be audio/mpeg, we looked
# into what Harvard fits used, saw mediainfo was one of the tools, so decided we
# would use that as a fallback. Since it will be much slower than the magic-byte-based
# detection.
#
# Not sure how reliable `mediainfo` is for non-media files, plus it we use it as a fallback.
#
# The API is similar to the internal Shrine::DetermineMimeType::MimeTypeAnalyzer,
# it is based on that.
#
# MediainfoAnalyzer.new.call(io)
# #=> "audio/mpeg"
# #=> nil if mediainfo has no idea
#
class MediainfoAnalyzer
class_attribute :mediainfo_command, default: "mediainfo"
self.mediainfo_command = "mediainfo"
# returns mime-type as determined by shell out to mediainfo command
#
# io argument will have `rewind` called before returning.
def call(io, _options ={})
# To use 'mediainfo' we need a local file, which if the file is currently remote means we
# will have to download a local copy into a tempfile, this could take a while for a big file.
Shrine.with_file(io) do |tempfile|
out, err = tty_command.run("#{mediainfo_command} --Inform=\"General;%InternetMediaType%\"", tempfile.path)
mime_type = out.chomp
mime_type = nil if mime_type.blank?
return mime_type
end
end
private
def tty_command
@tty_comand ||= TTY::Command.new(printer: :null)
end
end
end
Version data entries
31 entries across 31 versions & 1 rubygems