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Copyright by Timothy Andrew Box 2015 Copyright by Timothy Andrew Box 2015 The Report committee for Timothy Andrew Box Certifies that this is the approved version of the following report: Swapbeat.com: A Streaming, Adaptive Music Service in the Browser APPROVED BY SUPERVISING COMMITTEE: Supervisor: ______________________________________________ Christine Julien ______________________________________________ Joydeep Ghosh Swapbeat.com: A Streaming, Adaptive Music Service in the Browser by Timothy Andrew Box, B.A.; M.P.Aff. Report Presented to the Faculty of the Graduate School of the University of Texas at Austin in Partial Fulfillment of the Requirements for the Degree of Master of Science in Engineering The University of Texas at Austin December 2015 “Necessity is a ferocious teacher.” - Michel de Montaigne Acknowledgements I would like to thank my family – Jim, Nancy and Emily – for their unconditional love and their unwavering support in helping me pursue my dreams. I would also like to thank my advisor, Christine Julien, and my reader, Joydeep Ghosh, for their contributions to this project. Finally, I would like to acknowledge the support of the late Tim Mauldin, a great friend and mentor who passed too soon. v Swapbeat.com: A Streaming, Adaptive Music Service in the Browser by Timothy Andrew Box, M.S.E. The University of Texas at Austin, 2015 SUPERVISOR: Christine Julien In recent years, ongoing shifts in the economics of the music industry have driven many artists to reevaluate how they intend to make money, with some artists now deciding that they will give their music away for free if it will increase their popularity and drive more fans to buy tickets to see their live shows. Sites such as SoundCloud.com cater to this dynamic, allowing artists to host their music on the site for unlimited free streaming and download by fans. However, the sheer volume of music being uploaded to SoundCloud makes it impossible for even the most diehard music fans to keep tabs on what has been released and what is becoming popular with other listeners. This paper therefore discusses the creation of swapbeat.com, a browser- based music streaming service. The site operates by first measuring how frequently new songs are being reviewed across 175+ popular music review sites on the Internet. The most frequently reviewed songs are then added to the swapbeat.com site, where score-based playlists of the songs are regenerated at frequent intervals, based on several explicit and implicit measures of sentiment gathered from users as vi they listen to music on the site. Experiences and observations from the first two months of operation for swapbeat.com are then reviewed, and areas for further work are proposed. vii Table of Contents Table of Contents ................................................................................................................................... viii List of Tables ............................................................................................................................................... xi List of Figures ............................................................................................................................................ xii Chapter 1: Introduction ........................................................................................................................... 1 Chapter 2: Initial Design ......................................................................................................................... 4 Introduction ............................................................................................................................................ 4 Creating the Webcrawler ................................................................................................................... 4 How the Targeted Crawler Works ............................................................................................ 4 From SOLR to Default-Enabled RSS feeds in WordPress ........................................... 6 The Simple Pie Library .............................................................................................................. 7 Extending Simple Pie to Find Music .................................................................................... 7 What is a SoundCloud Widget? ......................................................................................... 8 The Format of the Embeddable SoundCloud Widget Code .................................. 8 Parsing posts for SoundCloud Widgets and Unique IDs ........................................ 9 Scenario 1: No Track Found ............................................................................................ 10 Scenario 2: New Track Found ........................................................................................ 10 Scenario 3: Known Track Found ................................................................................... 11 Performance and Potential Webcrawler Improvements ............................................. 13 Migrating the Crawler from Single-threaded to Multi-threaded ......................... 13 Adding Tracks to Be Played ...................................................................................................... 14 Creating the Application ................................................................................................................. 16 Front-end .......................................................................................................................................... 16 The Importance of User Experience ................................................................................. 16 Creating a Single Page Application and the Application Data Map ..................... 17 Caching for Performance ...................................................................................................... 21 Special Case: Maintaining the Cache when a User Favorites a Track ........... 22 Playing Sound ............................................................................................................................ 23 Sound Manager 2 ................................................................................................................. 24 Sound Manager 2 Extensions: Bar UI ......................................................................... 25 viii Bringing it all Together ..................................................................................................... 26 Rendering the Tracklist ......................................................................................................... 27 Function of FormatReturnedTracks.js ....................................................................... 28 Track Elements Formatted .............................................................................................. 29 Track Position .................................................................................................................. 29 Track Movement Indicator ......................................................................................... 29 Artwork Frame ................................................................................................................ 30 Track Title .......................................................................................................................... 30 Artist Names ..................................................................................................................... 31 Formatting Site Names ................................................................................................. 33 The Favorite Button ...................................................................................................... 34 Like and Dislike Buttons .............................................................................................. 35 Player Controls ................................................................................................................ 35 Linking to SoundCloud Artist Pages ....................................................................... 36 Event Tracking and Updating the Marquee .................................................................. 37 User Accounts with Facebook Login ................................................................................ 38 Registering the Application with Facebook ............................................................. 38 Initializing the Facebook Authentication SDK ........................................................ 38 Integrating with the Facebook Log-in Button ......................................................... 39 Middleware ...................................................................................................................................... 41 Backend ............................................................................................................................................. 43 Specific Design Choices for a Music Site ......................................................................... 43 Storing JSON in the Database ......................................................................................... 44 Preprocessing the “Most Popular” playlists by Time Period ............................ 46 Scoring Tracks for Playlist Inclusion .......................................................................... 47 Events Weighted by Type ........................................................................................... 47 Events Weighted by Tracklist Position ................................................................
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