gistfile1.rb

# Do you prefer option 'A'

      makes_derivatives_of :content, when: :mime_type, is: 'application/pdf',
            derivatives: {  :thumb => "100x100>"  }
      
      makes_derivatives_of :content, when: :mime_type, is: 'audio/wav',
            derivatives: {  :mp3 => {format: 'mp3'}, :ogg => {format: 'ogg'} }, processors: :audio
            
      makes_derivatives_of :content, when: :mime_type, is: 'video/avi',
            derivatives: { :mp4 => {format: 'mp4'}, :webm => {format: 'webm'} }, processors: :video
                        
      makes_derivatives_of :content, when: :mime_type, is_one_of: ['image/png', 'image/jpg'],
             derivatives: { :medium => "300x300>", :thumb => "100x100>" }



# or option 'B'


      makes_derivatives_of :content do |obj, ds| 
        case obj.mime_type
        when 'application/pdf'
          obj.transform_datastream ds, { :thumb => "100x100>" }
        when 'audio/wav'
          obj.transform_datastream ds, { :mp3 => {format: 'mp3'}, :ogg => {format: 'ogg'} }, processor: :audio
        when 'video/avi'
          obj.transform_datastream ds, { :mp4 => {format: 'mp4'}, :webm => {format: 'webm'} }, processor: :video
        when 'image/png', 'image/jpg'
          obj.transform_datastream ds, { :medium => "300x300>", :thumb => "100x100>" }
        end
      end 

# or option 'C'

      makes_derivatives do |obj|
        case obj.mime_type
        when 'application/pdf'
          obj.transform_datastream :content, { :thumb => "100x100>" }
        when 'audio/wav'
          obj.transform_datastream :content, { :mp3 => {format: 'mp3'}, :ogg => {format: 'ogg'} }, processor: :audio
        when 'video/avi'
          obj.transform_datastream :content, { :mp4 => {format: 'mp4'}, :webm => {format: 'webm'} }, processor: :video
        when 'image/png', 'image/jpg' 
          obj.transform_datastream :content, { :medium => "300x300>", :thumb => "100x100>" }
        end
      end

C would be my first choice, with B close behind. I don't like A at all.

Oops, I forgot to say: FRIST!1!!!!!

Clarification: for context, see

Option A: https://github.com/projecthydra/hydra-derivatives/blob/042c43f08f53ac275a72fb50841f245960e77ebf/spec/units/transcoding_spec.rb

Option B: https://github.com/projecthydra/hydra-derivatives/blob/66cf964041016c2f3dbc66a3b0a94da72410e67b/spec/units/transcoding_spec.rb

C would be my pick.