mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-11-03 13:30:52 -05:00
5b9645bf09
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@189 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
53 lines
2.8 KiB
HTML
53 lines
2.8 KiB
HTML
<!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/4.73 [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>
|
|
Opening a Stream using Defaults</h2>
|
|
|
|
<blockquote>The next step is to open a stream which is similar to opening
|
|
a file. You can specify whether you want audio input and/or output, how
|
|
many channels, the data format, sample rate, etc. There are two calls for
|
|
opening streams, <tt>Pa_OpenStream</tt>() and <tt>Pa_OpenDefaultStream</tt>().
|
|
<p><tt>Pa_OpenStream()</tt> takes extra parameters which give you
|
|
more control. You can normally just use <tt>Pa_OpenDefaultStream</tt>()
|
|
which just calls <tt>Pa_OpenStream()</tt> <tt>with</tt> some reasonable
|
|
default values. Let's open a stream for stereo output, using floating
|
|
point data, at 44100 Hz.
|
|
<blockquote>
|
|
<pre>err = Pa_OpenDefaultStream(
|
|
&stream, /* passes back stream pointer */
|
|
0, /* no input channels */
|
|
2, /* stereo output */
|
|
paFloat32, /* 32 bit floating point output */
|
|
44100, /* sample rate */
|
|
256, /* frames per buffer */
|
|
0, /* number of buffers, if zero then use default minimum */
|
|
patestCallback, /* specify our custom callback */
|
|
&data ); /* pass our data through to callback */</pre>
|
|
</blockquote>
|
|
If you want to use 16 bit integer data, pass <tt>paInt16</tt> instead of
|
|
<tt>paFloat32</tt>.</blockquote>
|
|
<font size=+2><a href="http://www.portaudio.com/">home</a> | <a href="pa_tutorial.html">contents</a>
|
|
| <a href="pa_tut_init.html">previous</a> | <a href="pa_tut_run.html">next</a></font>
|
|
</body>
|
|
</html>
|