Dr. Dobb's is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.


Channels ▼
RSS

Embedded Systems

Real-Time Sound Processing

By Randall Cook, October 01, 1998

Conceptually, real-time audio processing is simple. In practice, however, it is anything but easy. Randall discusses the issues involved in real-time sound processing and how to encapsulate operating system differences behind a cross-platform layer.
Oct98: DirectSound: The Future of Recording on Windows

Dr. Dobb's Journal October 1998

DirectSound: The Future of Recording on Windows

Recording in real time on Windows can be complicated. However, Microsoft is changing things with DirectX 5. Its DirectSound subsystem now supports audio capture. It has a slightly simpler interface, and it works very differently than the traditional Windows and Mac OS systems. You allocate a single buffer that DirectSound fills in a circular fashion. You can have DirectSound notify you when it has recorded a certain amount of data, or you can ask it yourself. When enough data has been recorded, you can copy it out of the circular buffer and process it as you see fit. The initial release does not offer any performance improvements over the existing waveIn APIs in terms of letting you process the samples sooner after they are recorded, but in the future it will. Look up DirectSound and DirectSoundCapture on MSDN for more information.

-- R.C.

Back to Article

Copyright © 1998, Dr. Dobb's Journal


Previous 1 2 3 4 Next

Related Reading

News

Commentary

Slideshow

Video

Most Popular

More Insights

White Papers

More >>

Reports

More >>

Webcasts

More >>
INFO-LINK




Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

 
Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.
 

Embedded Systems Recent Articles

Most Popular

Stories Blogs

Upcoming Events



Most Recent Premium Content

Digital Issues