<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<title>Jack2: JackLoopbackDriver.cpp Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<link href="doxygen.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<!-- Generated by Doxygen 1.7.3 -->
<div id="top">
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td style="padding-left: 0.5em;">
<div id="projectname">Jack2 <span id="projectnumber">1.9.7</span></div>
</td>
</tr>
</tbody>
</table>
</div>
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="index.html"><span>Main Page</span></a></li>
<li><a href="pages.html"><span>Related Pages</span></a></li>
<li><a href="modules.html"><span>Modules</span></a></li>
<li><a href="annotated.html"><span>Classes</span></a></li>
<li class="current"><a href="files.html"><span>Files</span></a></li>
</ul>
</div>
<div id="navrow2" class="tabs2">
<ul class="tablist">
<li><a href="files.html"><span>File List</span></a></li>
<li><a href="globals.html"><span>File Members</span></a></li>
</ul>
</div>
<div class="header">
<div class="headertitle">
<h1>JackLoopbackDriver.cpp</h1> </div>
</div>
<div class="contents">
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">Copyright (C) 2001 Paul Davis</span>
<a name="l00003"></a>00003 <span class="comment">Copyright (C) 2004-2008 Grame</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">This program is free software; you can redistribute it and/or modify</span>
<a name="l00006"></a>00006 <span class="comment">it under the terms of the GNU General Public License as published by</span>
<a name="l00007"></a>00007 <span class="comment">the Free Software Foundation; either version 2 of the License, or</span>
<a name="l00008"></a>00008 <span class="comment">(at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment">This program is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment">but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment">MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00013"></a>00013 <span class="comment">GNU General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment">You should have received a copy of the GNU General Public License</span>
<a name="l00016"></a>00016 <span class="comment">along with this program; if not, write to the Free Software</span>
<a name="l00017"></a>00017 <span class="comment">Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.</span>
<a name="l00018"></a>00018 <span class="comment"></span>
<a name="l00019"></a>00019 <span class="comment">*/</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="preprocessor">#include "JackSystemDeps.h"</span>
<a name="l00022"></a>00022 <span class="preprocessor">#include "JackLoopbackDriver.h"</span>
<a name="l00023"></a>00023 <span class="preprocessor">#include "JackDriverLoader.h"</span>
<a name="l00024"></a>00024 <span class="preprocessor">#include "JackEngineControl.h"</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include "JackGraphManager.h"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "JackError.h"</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include <iostream></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <assert.h></span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="keyword">namespace </span>Jack
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="keywordtype">int</span> JackLoopbackDriver::Process()
<a name="l00034"></a>00034 {
<a name="l00035"></a>00035 <span class="comment">// Loopback copy</span>
<a name="l00036"></a>00036 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < fCaptureChannels; i++) {
<a name="l00037"></a>00037 memcpy(GetInputBuffer(i), GetOutputBuffer(i), <span class="keyword">sizeof</span>(jack_default_audio_sample_t) * fEngineControl->fBufferSize);
<a name="l00038"></a>00038 }
<a name="l00039"></a>00039
<a name="l00040"></a>00040 fGraphManager->ResumeRefNum(&fClientControl, fSynchroTable); <span class="comment">// Signal all clients</span>
<a name="l00041"></a>00041 <span class="keywordflow">if</span> (fEngineControl->fSyncMode) {
<a name="l00042"></a>00042 <span class="keywordflow">if</span> (fGraphManager->SuspendRefNum(&fClientControl, fSynchroTable, DRIVER_TIMEOUT_FACTOR * fEngineControl->fTimeOutUsecs) < 0) {
<a name="l00043"></a>00043 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"JackLoopbackDriver::ProcessSync SuspendRefNum error"</span>);
<a name="l00044"></a>00044 <span class="keywordflow">return</span> -1;
<a name="l00045"></a>00045 }
<a name="l00046"></a>00046 }
<a name="l00047"></a>00047 <span class="keywordflow">return</span> 0;
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049
<a name="l00050"></a>00050 } <span class="comment">// end of namespace</span>
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00053"></a>00053 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span>
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055 <span class="preprocessor">#endif</span>
<a name="l00056"></a>00056 <span class="preprocessor"></span>
<a name="l00057"></a>00057 SERVER_EXPORT <a class="code" href="structjack__driver__desc__t.html">jack_driver_desc_t</a> * driver_get_descriptor()
<a name="l00058"></a>00058 {
<a name="l00059"></a>00059 <a class="code" href="structjack__driver__desc__t.html">jack_driver_desc_t</a> * desc;
<a name="l00060"></a>00060 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
<a name="l00061"></a>00061
<a name="l00062"></a>00062 desc = (<a class="code" href="structjack__driver__desc__t.html">jack_driver_desc_t</a>*)calloc (1, <span class="keyword">sizeof</span> (<a class="code" href="structjack__driver__desc__t.html">jack_driver_desc_t</a>));
<a name="l00063"></a>00063 strcpy(desc-><a class="code" href="structjack__driver__desc__t.html#a42ee3aae5d4587330cb03879eacc760b">name</a>, <span class="stringliteral">"loopback"</span>); <span class="comment">// size MUST be less then JACK_DRIVER_NAME_MAX + 1</span>
<a name="l00064"></a>00064 strcpy(desc-><a class="code" href="structjack__driver__desc__t.html#ae4efd9a47ac036aee951241be0c45654">desc</a>, <span class="stringliteral">"Loopback backend"</span>); <span class="comment">// size MUST be less then JACK_DRIVER_PARAM_DESC + 1</span>
<a name="l00065"></a>00065
<a name="l00066"></a>00066 desc-><a class="code" href="structjack__driver__desc__t.html#a2efc65ee5c526f37589ff715861227f5">nparams</a> = 1;
<a name="l00067"></a>00067 desc-><a class="code" href="structjack__driver__desc__t.html#a4adfdb11fdfa44a5154da9ac971bb44c">params</a> = (<a class="code" href="structjack__driver__param__desc__t.html">jack_driver_param_desc_t</a>*)calloc (desc-><a class="code" href="structjack__driver__desc__t.html#a2efc65ee5c526f37589ff715861227f5">nparams</a>, sizeof (<a class="code" href="structjack__driver__param__desc__t.html">jack_driver_param_desc_t</a>));
<a name="l00068"></a>00068
<a name="l00069"></a>00069 i = 0;
<a name="l00070"></a>00070 strcpy(desc-><a class="code" href="structjack__driver__desc__t.html#a4adfdb11fdfa44a5154da9ac971bb44c">params</a>[i].<a class="code" href="structjack__driver__param__desc__t.html#a4cf775ccfc72358ffbec7adf2800e532">name</a>, <span class="stringliteral">"channels"</span>);
<a name="l00071"></a>00071 desc-><a class="code" href="structjack__driver__desc__t.html#a4adfdb11fdfa44a5154da9ac971bb44c">params</a>[i].<a class="code" href="structjack__driver__param__desc__t.html#a0d80d0f9092d4fdaba7a3e37f82f3313">character</a> = <span class="charliteral">'c'</span>;
<a name="l00072"></a>00072 desc-><a class="code" href="structjack__driver__desc__t.html#a4adfdb11fdfa44a5154da9ac971bb44c">params</a>[i].<a class="code" href="structjack__driver__param__desc__t.html#a1f7d08207a0c3285329a0bc7a7e6c59e">type</a> = JackDriverParamInt;
<a name="l00073"></a>00073 desc-><a class="code" href="structjack__driver__desc__t.html#a4adfdb11fdfa44a5154da9ac971bb44c">params</a>[i].<a class="code" href="structjack__driver__param__desc__t.html#a817eb04d0ccf7203345e55e608a7495f">value</a>.ui = 0;
<a name="l00074"></a>00074 strcpy(desc-><a class="code" href="structjack__driver__desc__t.html#a4adfdb11fdfa44a5154da9ac971bb44c">params</a>[i].<a class="code" href="structjack__driver__param__desc__t.html#acf46bb8d0507e06d2cae119eb87babe4">short_desc</a>, <span class="stringliteral">"Maximum number of loopback ports"</span>);
<a name="l00075"></a>00075 strcpy(desc-><a class="code" href="structjack__driver__desc__t.html#a4adfdb11fdfa44a5154da9ac971bb44c">params</a>[i].<a class="code" href="structjack__driver__param__desc__t.html#ac853d853d09f7fa3363b1f23b7bae5f1">long_desc</a>, desc-><a class="code" href="structjack__driver__desc__t.html#a4adfdb11fdfa44a5154da9ac971bb44c">params</a>[i].<a class="code" href="structjack__driver__param__desc__t.html#acf46bb8d0507e06d2cae119eb87babe4">short_desc</a>);
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="keywordflow">return</span> desc;
<a name="l00078"></a>00078 }
<a name="l00079"></a>00079
<a name="l00080"></a>00080 SERVER_EXPORT <a class="code" href="classJack_1_1JackDriverClientInterface.html" title="The base interface for drivers clients.">Jack::JackDriverClientInterface</a>* driver_initialize(<a class="code" href="classJack_1_1JackLockedEngine.html" title="Locked Engine, access to methods is serialized using a mutex.">Jack::JackLockedEngine</a>* engine, <a class="code" href="classJack_1_1JackMachSemaphore.html" title="Inter process synchronization using using Mach semaphore.">Jack::JackSynchro</a>* table, <span class="keyword">const</span> <a class="code" href="struct__JSList.html">JSList</a>* params)
<a name="l00081"></a>00081 {
<a name="l00082"></a>00082 <span class="keyword">const</span> <a class="code" href="struct__JSList.html">JSList</a> * node;
<a name="l00083"></a>00083 <span class="keyword">const</span> <a class="code" href="structjack__driver__param__t.html">jack_driver_param_t</a> * param;
<a name="l00084"></a>00084 <span class="keywordtype">int</span> channels = 2;
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="keywordflow">for</span> (node = params; node; node = jack_slist_next (node)) {
<a name="l00087"></a>00087 param = (<span class="keyword">const</span> <a class="code" href="structjack__driver__param__t.html">jack_driver_param_t</a> *) node->data;
<a name="l00088"></a>00088
<a name="l00089"></a>00089 switch (param->character) {
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="keywordflow">case</span> <span class="charliteral">'c'</span>:
<a name="l00092"></a>00092 channels = param->value.ui;
<a name="l00093"></a>00093 <span class="keywordflow">break</span>;
<a name="l00094"></a>00094 }
<a name="l00095"></a>00095 }
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <a class="code" href="classJack_1_1JackDriverClientInterface.html" title="The base interface for drivers clients.">Jack::JackDriverClientInterface</a>* driver = <span class="keyword">new</span> <a class="code" href="classJack_1_1JackLoopbackDriver.html" title="The loopback driver : to be used to &quot;pipeline&quot; applications connected in sequence...">Jack::JackLoopbackDriver</a>(engine, table);
<a name="l00098"></a>00098 <span class="keywordflow">if</span> (driver->Open(1, 1, channels, channels, <span class="keyword">false</span>, <span class="stringliteral">"loopback"</span>, <span class="stringliteral">"loopback"</span>, 0, 0) == 0) {
<a name="l00099"></a>00099 <span class="keywordflow">return</span> driver;
<a name="l00100"></a>00100 } <span class="keywordflow">else</span> {
<a name="l00101"></a>00101 <span class="keyword">delete</span> driver;
<a name="l00102"></a>00102 <span class="keywordflow">return</span> NULL;
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00107"></a>00107 <span class="preprocessor"></span>}
<a name="l00108"></a>00108 <span class="preprocessor">#endif</span>
</pre></div></div>
</div>
<hr size="1"><address style="text-align: right;"><small>
Generated for Jack2 by <a href="http://www.doxygen.org/
index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a>
1.7.3</small></address>
</body>
</html>
