March 2012
Intermediate to advanced
1011 pages
31h 11m
English
Content preview from Programming iOS 5, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 27. Audio
iOS provides various means and technologies for allowing your app to produce sound (and even to input it). The topic is a large one, so this chapter can only introduce it. You’ll want to read Apple’s Multimedia Programming Guide and Core Audio Overview.
None of the classes discussed in this chapter provide any user interface within your application for allowing the user to stop and start playback of sound. You can create your own such interface, and I’ll discuss how you can associate the “remote control” buttons with your application. Also, a web view (Chapter 24) supports the HTML 5 <audio> tag; this can be a simple, lightweight way to play audio and to allow the user to control playback. (By default, a web view in iOS 5 even allows use of AirPlay.) Alternatively, you could treat the sound as a movie and use the MPMoviePlayerController class discussed in Chapter 28; this can also be a good way to play a sound file located remotely over the Internet.
System Sounds
The simplest form of sound is system sound, which is the iOS equivalent of the basic computer “beep.” This is implemented through System Sound Services; you’ll need to import <AudioToolbox/AudioToolbox.h> and link to AudioToolbox.framework. You’ll be calling one of two C functions, which behave very similarly to one another:
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AudioServicesPlayAlertSound - Plays a sound and, on an iPhone, may also vibrate the device, depending on the user’s settings. On the original iPod touch, plays only a built-in alert ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.