Starting with OpenAL


I wanted to capture audio through microphone in C/C++. After searching a lot i decided to go for OpenAL, an open source library for audio manipulation operations. I have just started with it. Here is the procedure i followed to get my first OpenAL code working. (I am using MS Visual Studio 2008 compiler on windows).

OpenAL
======
Official Site for OpenAL downloads: http://connect.creativelabs.com/openal/Downloads/Forms/AllItems.aspx
Download the following files:
1. oalinst
2. OpenAL11CoreSDK
3. ALUT > freealut-1.1.0-src (Windows Source)
ALUT is a starting point for learning OpenAL. Contains simple programs to get familiar with OpenAL.

and extract all.

Working with OpenAL
===================
Installation Steps:
1. Install OpenAL “oalinst.exe”. Its very small.
2. Install OpenAL “OpenAL11CoreSDK.exe”. Check if u got the folder named “C:\Program Files\OpenAL 1.1 SDK”
3. Open Visual Studio. Goto Tools> Options> Project & solutions> VC++ Directories.
–> Show directories for Library files.
Add “C:\Program Files\OpenAL 1.1 SDK\libs\Win32”.
Apply.

Building the “freealut” project
===============================
1. Go to “freealut-1.1.0-src\admin\VisualStudioDotNET” folder & open “ault.sln”. If it is in previous version of Visual Studio, it’ll ask to convert to VC9. Do it.
There will be 3 projects in the solution file:
i. alut
ii. hello_world
iii. playfile

2. For each of the projects, go to “Project > Properties” and make the following modification:
Configuration Properties> C/C++ > General > Additional Include directiories:
change “C:\Program Files\OpenAL 1.1 with EFX SDK\include” to “C:\Program Files\OpenAL 1.1 SDK\include” (the exact pathname where OpenAL SDK is installed).

Remember to do this for Debug and Release modes.

3. I prefer to have the generated output .exe files to be in a separate folder near the solution file.
So change the Output Directory in “Configuration properties > General” to “..\Debug” (for Debug mode) and “..\Release” (for Release mode).

Now if u build (F7) the solution, u’ll get the corresponding output .exe files in the “Debug” or “Release” folder in the directory where the .sln is present.
Double click “hello_world.exe” to HEAR “hello world”!
“playfile.exe” needs to be run from command prompt with a audio .wav file as argument. eg: C:..\Debug>playfile file1.wav

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