Peter Lubbers - Pro HTML 5 Programming

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Download from Wow! eBook 262 CHAPTER 11 ■ THE FUTURE OF HTML5 Figure 11-2. Shader Toy is a WebGL shader workbench ■ Note Not only is the WebGL effort bringing OpenGL to JavaScript, it is spinning off a general-purpose binary data API as well. A fast 3D API needs binary buffers. To that end, there is a new proposal for an API for manipulating binary data called TypedArray. If the proposal takes off, TypedArray will likely be useful throughout HTML5. Devices Web applications will need access to multimedia hardware such as webcams, microphones, or attached storage devices. For this, there is already a proposed device element to give web applications access to data streams from attached hardware. Of course, there are serious privacy implications, so not every script will be able to use your webcam at will. We will probably see a UI pattern of prompting for user permission as seen in the Geolocation and Storage APIs when an application requests elevated
CHAPTER 11 ■ THE FUTURE OF HTML5 privileges. The obvious application for webcams is video conferencing, but there are many other amazing possibilities for computer vision in web applications including augmented reality and head tracking. Audio Data API Programmable audio APIs will do for what did for . Prior to the canvas tag, images on the Web were largely opaque to scripts. Image creation and manipulation had to occur on the sidelines—namely, on the server. Now, there are tools for creating and manipulating visual media based on the canvas element. Similarly, audio data APIs will enable music creation in HTML5 applications. This will help round out the content-creation capabilities available to web applications and move us closer to a self-hosting world of tools to create media on and for the Web. Imagine editing audio on the Web without having to leave the browser. Simple playback of sounds can be done with the element. However, any application that manipulates, analyzes, or generates sound on the fly needs a lower-level API. Text-to-speech, speech-tospeech, synthesizers, and music visualization aren’t possible without access to audio data. We can expect the standard audio API to work well with microphone input from the data element as well as files included with audio tags. With and an audio data API, you may be able to make an HTML5 application that allows users to record and edit sound from within a page. Audio clips will be able to be stored in local browser storage and reused and combined with canvas-based editing tools. Presently, Mozilla has an experimental implementation available in nightly builds. The Mozilla audio data API could act as a starting point for standard cross-browser audio programming capabilities. Video Improvements Earlier in this book, we described in detail the current capabilities of the element. While there is still no required video codec specified in HTML5, Google recently released WebM, a high-quality, royalty-free video codec for the Web. Although not all vendors have agreed to support WebM yet, there is significant momentum behind the format. Additionally, there is increased demand for improvements in the current controls for HTML5 video. In order to fully replace plugin-based rendering of video, HTML’s own control will need to introduce better APIs for streaming. Expect this capability to evolve in the next iterations of the media tags; with increased adoption of devices without Flash playback, such as the Apple iPad and iPhone, there is a significant incentive to bring Web video to a large audience with only HTML5. Touchscreen Device Events As Web access shifts ever more from desktops and laptops to mobile phones and tablets, HTML5 is also continuing to adapt with changes in interaction handling. When Apple introduced the iPhone, it also introduced into its browser a set of special events that could be used to handle multitouch inputs and device rotation. Although these events have not yet been standardized, they are being picked up by other vendors of mobile devices. Learning them today will allow you to optimize your web applications for the most popular devices now. 263
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THE EXPERT’S VOICE ® IN WEB DEVE
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■ ■ ■ Pro HTML5 Programming P
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For my beautiful wife, Vittoria, an
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Contents ■Foreword ..............
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■ CONTENTS Implementing Canvas Se
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■ CONTENTS Summary ..............
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■ CONTENTS Setting and Retrieving
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Foreword In June 2004, representati
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About the Technical Reviewer � Pa
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Introduction HTML5 is brand new. In
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C H A P T E R 1 ■ ■ ■ Overvie
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CHAPTER 1 ■ OVERVIEW OF HTML5 wit
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Interoperability Simplification CHA
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• MathML • Microdata • Server
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Figure 1-1. A page rendered in stan
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Table 1-2. New sectioning HTML5 ele
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CHAPTER 1 ■ OVERVIEW OF HTML5 Wit
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article { background-color: #eee; d
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Figure 1-2. An HTML5 page with all
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CHAPTER 1 ■ OVERVIEW OF HTML5 The
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Figure 1-3. Developer Tools view in
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CHAPTER 1 ■ OVERVIEW OF HTML5 All
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C H A P T E R 3 ■ ■ ■ Working
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Audio and Video Codecs CHAPTER 3
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Table 3-1. Browser support for HTML
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MEDIA FOR EVERYONE CHAPTER 3 ■ WO
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CHAPTER 3 ■ WORKING WITH HTML5 AU
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Table 3-4 shows a few of the read-o
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find the actual frame since the vid
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LOSING VIEWERS IN THE OF AN EYE CH
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C H A P T E R 4 ■ ■ ■ Using t
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A device can use any of the followi
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Table 4-4. Pros and cons of cell ph
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Figure 4-1. HTML5 Geolocation brows
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CHAPTER 4 ■ USING THE HTML5 GEOLO
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Listing 4-6. The Haversine formula
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Listing 4-9. Adding the loadDemo()
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THE EASIEST WAY TO TRAVEL CHAPTER 4
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var deltaLatitude = toRadians(latit
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Practical Extras CHAPTER 4 ■ USIN
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Show Me on a Google Map CHAPTER 4
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CHAPTER 5 ■ USING THE COMMUNICATI
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var defaultTitle = "Portal [http://
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Send Notification CHAPTER 5 ■ U
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Figure 5-4. Difference between clie
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“SEEMINGLY ARBITRARY” TIMES CHA
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crossOriginRequest.upload.onprogres
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Figure 6-1. The complexity of real-
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Listing 6-2. The WebSocket interfac
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Listing 6-4. HTTP response header H
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EXISTING WEBSOCKET SERVERS CHAPTER
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CHAPTER 6 ■ USING THE HTML5 WEBSO
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def terminate(self): self.ready_sta
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self.sessions = [] self.port = port
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Basic API Usage CHAPTER 6 ■ USING
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HTML5 WebSocket / Geolocation Track
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