lighttroupe/luz

$video_files ||= {}
require 'video_file/ffmpeg'

class ActorEffectVideoFile < ActorEffect
    title                "Video File"
    description ""

    categories :color

    setting 'file_name', :string
    setting 'speed', :float, :range => 0.0..10.0, :default => 1.0..1.0

    setting 'jump_frames', :integer, :range => 10..10000
    setting 'jump_forward', :event
    setting 'jump_backward', :event

    def after_load
        @frame_index = 0.0        # NOTE: float
        super
    end

    def tick
        reload_if_needed
        @frame_index ||= 0
        @frame_index += (speed)

        #@skip_frames += jump_frames if jump_forward.now?
        #@skip_frames -= jump_frames if jump_backward.now?
        #@frame_index += (1 + @skip_frames)
    end

    def render
        return yield unless @file

        frame_index_integer, remainder = @frame_index.divmod(1.0)

        @file.with_frame(frame_index_integer) {
            yield
        }

        #@frame_index = @file.frame_index - 1        # since it progresses automatically after reading the next frame
        #@skip_frames = 0
    end

private

    def reload_if_needed
        if file_name != @file_name
            if $engine.project.file_path
                path = File.join($engine.project.file_path, file_name)
                @file = FFmpeg::File.new(path) if File.file?(path)
            end
            @file_name = file_name
        end
    end
end