May 2011
Beginner
834 pages
25h 19m
English
Content preview from Programming iOS 4Become 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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Further Topics in Sound
iOS is a powerful milieu for production and processing of sound; its sound-related technologies are extensive. Here are some further topics, beyond the scope of this book:
- Recording sound
- To record sound simply, use AVAudioRecorder. Your audio session policy will need to adopt a Record policy before recording begins.
- Audio queues
- Audio queues implement sound playing and recording through a C API with more granularity than the Objective-C AVAudioPlayer and AVAudioRecorder (though it is still regarded as a high-level API), giving you access to the buffers used to move chunks of sound data between stored sound data and sound hardware.
- Extended Audio File Services
- A C API for reading and writing sound files in chunks. It is useful in connection with technologies such as audio queues.
- Audio Converter Services
- A C API for converting sound files between formats.
- Streaming audio
- Audio streamed in real time over the network, such as an Internet radio station, can be played with Audio File Stream Services, in connection with audio queues.
- OpenAL
- An advanced technology for playing sound with fine control over its stereo stage and directionality.
- Audio units
- Plug-ins that filter and modify the nature and quality of a sound as it passes through them. See the Audio Unit Hosting Guide for iOS.
- CoreMIDI
- The CoreMIDI framework was introduced into iOS in version 4.2. It allows interaction with MIDI devices (but not, unfortunately, direct internal playback of ...
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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.
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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.