89 lines
2.7 KiB
Ruby
89 lines
2.7 KiB
Ruby
class MediaFile::Ugoira < MediaFile
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class Error < StandardError; end
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attr_reader :frame_data
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def initialize(file, frame_data: {}, **options)
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super(file, **options)
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@frame_data = frame_data
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end
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def close
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file.close
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zipfile.close
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preview_frame.close
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end
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def dimensions
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preview_frame.dimensions
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end
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def preview(width, height)
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preview_frame.preview(width, height)
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end
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def crop(width, height)
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preview_frame.crop(width, height)
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end
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# XXX should take width and height and resize image
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def convert
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raise NotImplementedError, "can't convert ugoira to webm: ffmpeg or mkvmerge not installed" unless self.class.videos_enabled?
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Dir.mktmpdir("ugoira-#{md5}") do |tmpdir|
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output_file = Tempfile.new(["ugoira-conversion", ".webm"], binmode: true)
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FileUtils.mkdir_p("#{tmpdir}/images")
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zipfile.each do |entry|
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path = File.join(tmpdir, "images", entry.name)
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entry.extract(path)
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end
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# Duplicate last frame to avoid it being displayed only for a very short amount of time.
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last_file_name = zipfile.entries.last.name
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last_file_name =~ /\A(\d{6})(\.\w{,4})\Z/
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new_last_index = $1.to_i + 1
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file_ext = $2
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new_last_filename = ("%06d" % new_last_index) + file_ext
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path_from = File.join(tmpdir, "images", last_file_name)
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path_to = File.join(tmpdir, "images", new_last_filename)
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FileUtils.cp(path_from, path_to)
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delay_sum = 0
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timecodes_path = File.join(tmpdir, "timecodes.tc")
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File.open(timecodes_path, "w+") do |f|
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f.write("# timecode format v2\n")
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frame_data.each do |img|
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f.write("#{delay_sum}\n")
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delay_sum += (img["delay"] || img["delay_msec"])
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end
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f.write("#{delay_sum}\n")
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f.write("#{delay_sum}\n")
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end
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ext = zipfile.first.name.match(/\.(\w{,4})$/)[1]
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ffmpeg_out, status = Open3.capture2e("ffmpeg -i #{tmpdir}/images/%06d.#{ext} -codec:v libvpx -crf 4 -b:v 5000k -an #{tmpdir}/tmp.webm")
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raise Error, "ffmpeg failed: #{ffmpeg_out}" unless status.success?
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mkvmerge_out, status = Open3.capture2e("mkvmerge -o #{output_file.path} --webm --timecodes 0:#{tmpdir}/timecodes.tc #{tmpdir}/tmp.webm")
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raise Error, "mkvmerge failed: #{mkvmerge_out}" unless status.success?
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MediaFile.open(output_file)
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end
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end
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private
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def zipfile
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Zip::File.new(file.path)
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end
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def preview_frame
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tempfile = Tempfile.new("ugoira-preview", binmode: true)
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zipfile.entries.first.extract(tempfile.path) { true } # 'true' means overwrite the existing tempfile.
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MediaFile.open(tempfile)
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end
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memoize :zipfile, :preview_frame, :dimensions
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end
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