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Raspberry Pi for Secret Agents - Second Edition

You're reading from   Raspberry Pi for Secret Agents - Second Edition Turn your Raspberry Pi into your very own secret agent toolbox with this set of exciting projects

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Product type Paperback
Published in Jan 2015
Publisher
ISBN-13 9781784397906
Length 206 pages
Edition 2nd Edition
Languages
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Author (1):
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Stefan Sjogelid Stefan Sjogelid
Author Profile Icon Stefan Sjogelid
Stefan Sjogelid
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Table of Contents (7) Chapters Close

Preface 1. Getting Up to No Good FREE CHAPTER 2. Audio Antics 3. Webcam and Video Wizardry 4. Wi-Fi Pranks – Exploring Your Network 5. Taking Your Pi Off-road Index

Configuring your audio gadgets

Before you go jamming all your microphones and noisemakers into the Pi, let's take a minute to get to know the underlying sound system and the audio capabilities of the Raspberry Pi board itself.

Introducing the ALSA sound system

The Advanced Linux Sound Architecture (ALSA), is the underlying framework responsible for making all the sound stuff work on the Pi. ALSA provides kernel drivers for the Pi itself and for most USB gadgets that produce or record sound. The framework also includes code to help programmers make audio applications and a couple of command-line utilities that will prove very useful to us.

In ALSA lingo, each audio device on your system is a card, a word inherited from the days when most computers had a dedicated sound card. This means that any USB device you connect that makes or records sound is a card as far as ALSA is concerned—be it a microphone, headset, or webcam.

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