Charging based on upload

I need a form that will charge $2 per minute of audio uploaded (in either mp3 or wav format). Can the conditional logic in your forms achieve this by reading the uploaded file(s) metadata?

Unfortunately, it is not possible to achieve, you cannot get such info from the uploaded files, you can only know when the file has been uploaded, if you would like to set this, the following guide will help you setting up conditions to update fields values based on the info entered in other fields: https://www.jotform.com/help/268-Conditional-Logic-Inserts-Text-Calculation-Into-A-Field 

Hope this helps.