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diff --git a/pd/portaudio/docs/pa_tut_util.html b/pd/portaudio/docs/pa_tut_util.html new file mode 100644 index 00000000..f4b54750 --- /dev/null +++ b/pd/portaudio/docs/pa_tut_util.html @@ -0,0 +1,55 @@ +<!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> + +<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> +| <a href="pa_tut_devs.html">next</a></font> +</body> +</html> |