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authorMiller Puckette <millerpuckette@users.sourceforge.net>2005-12-31 01:32:12 +0000
committerMiller Puckette <millerpuckette@users.sourceforge.net>2005-12-31 01:32:12 +0000
commitfe8aa4ce5e8eebc1c6f762f4fc40328718a13e22 (patch)
tree90aabb628eeade33b37c3fe967557ca9b27ead62 /pd/portaudio_v18/docs/pa_tut_util.html
parent65a1b98552d7c6a93aedfb7c9b5d83f9038227cb (diff)
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-<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
-<html>
-<head>
- <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
- <meta name="GENERATOR" content="Mozilla/4.75 [en]C-gatewaynet (Win98; U) [Netscape]">
- <meta name="Author" content="Phil Burk">
- <meta name="Description" content="Tutorial for PortAudio, a cross platform, open-source, audio I/O library.It provides a very simple API for recording and/or playing sound using a simple callback function.">
- <meta name="KeyWords" content="audio, tutorial, library, portable, open-source, DirectSound,sound, music, JSyn, synthesis,">
- <title>PortAudio Tutorial</title>
-</head>
-<body>
-&nbsp;
-<center><table COLS=1 WIDTH="100%" BGCOLOR="#FADA7A" >
-<tr>
-<td>
-<center>
-<h1>
-PortAudio Tutorial</h1></center>
-</td>
-</tr>
-</table></center>
-
-<h2>
-Utility Functions</h2>
-
-<blockquote>Here are several more functions that are not critical, but
-may be handy when using PortAudio.
-<p>Pa_StreamActive() returns one when the stream in playing audio, zero
-when not playing, or a negative error number if the stream is invalid.
-The stream is active between calls to Pa_StartStream() and Pa_StopStream(),
-but may also become inactive if the callback returns a non-zero value.
-In the latter case, the stream is considered inactive after the last buffer
-has finished playing.
-<blockquote>
-<pre>PaError Pa_StreamActive( PortAudioStream *stream );</pre>
-</blockquote>
-Pa_StreamTime() returns the number of samples that have been generated.
-PaTimeStamp is a double precision number which is a convenient way to pass
-big numbers around even though we only need integers.
-<blockquote>
-<pre>PaTimestamp Pa_StreamTime( PortAudioStream *stream );</pre>
-</blockquote>
-The "CPU Load" is a fraction of total CPU time consumed by the stream's
-audio processing. A value of 0.5 would imply that PortAudio and the sound
-generating callback was consuming roughly 50% of the available CPU time.
-This function may be called from the callback function or the application.
-<blockquote>
-<pre>double Pa_GetCPULoad( PortAudioStream* stream );</pre>
-</blockquote>
-</blockquote>
-<font size=+2><a href="http://www.portaudio.com/">home</a> |
-<a href="pa_tutorial.html">contents</a> | <a href="pa_tut_term.html">previous</a>
-|&nbsp; <a href="pa_tut_devs.html">next</a></font>
-</body>
-</html>