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Class: ActiveStorage::Previewer::VideoPreviewer

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::ActiveStorage::Previewer
Instance Chain:
self, ::ActiveStorage::Previewer, ::ActiveStorage::Downloading
Inherits: ActiveStorage::Previewer
Defined in: activestorage/lib/active_storage/previewer/video_previewer.rb

Class Method Summary

::ActiveStorage::Previewer - Inherited

.accept?

Implement this method in a concrete subclass.
.new

Instance Attribute Summary

::ActiveStorage::Previewer - Inherited

#blob

Instance Method Summary

::ActiveStorage::Previewer - Inherited

#preview

Override this method in a concrete subclass.
#draw

Executes a system command, capturing its binary output in a tempfile.
#logger

::ActiveStorage::Downloading - Included

#download_blob_to

Efficiently downloads blob data into the given file.
#download_blob_to_tempfile

Opens a new tempfile in #tempdir and copies blob data into it.
#tempdir

Returns the directory in which tempfiles should be opened.

Constructor Details

This class inherits a constructor from ActiveStorage::Previewer

Class Method Details

.accept?(blob) ⇒ Boolean

[ GitHub ] 

  


# File 'activestorage/lib/active_storage/previewer/video_previewer.rb', line 5



def self.accept?(blob)
  blob.video?
end


  







Instance Method Details



  

    #preview  
  

  [ GitHub ]


  

  


# File 'activestorage/lib/active_storage/previewer/video_previewer.rb', line 9



def preview
  download_blob_to_tempfile do |input|
    draw_relevant_frame_from input do |output|
      yield io: output, filename: "#{blob.filename.base}.png", content_type: "image/png"
    end
  end
end