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<h1>JackEngineControl.cpp</h1> </div>
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<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) 2003 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 Lesser General Public License as published by</span>
<a name="l00007"></a>00007 <span class="comment">the Free Software Foundation; either version 2.1 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 Lesser 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 Lesser 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "JackClientInterface.h"</span>
<a name="l00022"></a>00022 <span class="preprocessor">#include "JackEngineControl.h"</span>
<a name="l00023"></a>00023 <span class="preprocessor">#include "JackGraphManager.h"</span>
<a name="l00024"></a>00024 <span class="preprocessor">#include "JackClientControl.h"</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <algorithm></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <math.h></span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="keyword">namespace </span>Jack
<a name="l00029"></a>00029 {
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="keyword">static</span> <span class="keyword">inline</span> jack_time_t JACK_MAX(jack_time_t a, jack_time_t b)
<a name="l00032"></a>00032 {
<a name="l00033"></a>00033 <span class="keywordflow">return</span> (a < b) ? b : a;
<a name="l00034"></a>00034 }
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="keywordtype">void</span> JackEngineControl::CalcCPULoad(JackClientInterface** table,
<a name="l00037"></a>00037 JackGraphManager* manager,
<a name="l00038"></a>00038 jack_time_t cur_cycle_begin,
<a name="l00039"></a>00039 jack_time_t prev_cycle_end)
<a name="l00040"></a>00040 {
<a name="l00041"></a>00041 fPrevCycleTime = fCurCycleTime;
<a name="l00042"></a>00042 fCurCycleTime = cur_cycle_begin;
<a name="l00043"></a>00043 jack_time_t last_cycle_end = prev_cycle_end;
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="comment">// In Asynchronous mode, last cycle end is the max of client end dates</span>
<a name="l00046"></a>00046 <span class="keywordflow">if</span> (!fSyncMode) {
<a name="l00047"></a>00047 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = fDriverNum; i < CLIENT_NUM; i++) {
<a name="l00048"></a>00048 JackClientInterface* client = table[i];
<a name="l00049"></a>00049 JackClientTiming* timing = manager->GetClientTiming(i);
<a name="l00050"></a>00050 <span class="keywordflow">if</span> (client && client->GetClientControl()->fActive && timing->fStatus == Finished)
<a name="l00051"></a>00051 last_cycle_end = JACK_MAX(last_cycle_end, timing->fFinishedAt);
<a name="l00052"></a>00052 }
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="comment">// Store the execution time for later averaging</span>
<a name="l00056"></a>00056 fRollingClientUsecs[fRollingClientUsecsIndex++] = last_cycle_end - fPrevCycleTime;
<a name="l00057"></a>00057 <span class="keywordflow">if</span> (fRollingClientUsecsIndex >= JACK_ENGINE_ROLLING_COUNT)
<a name="l00058"></a>00058 fRollingClientUsecsIndex = 0;
<a name="l00059"></a>00059
<a name="l00060"></a>00060 <span class="comment">// Every so often, recompute the current maximum use over the</span>
<a name="l00061"></a>00061 <span class="comment">// last JACK_ENGINE_ROLLING_COUNT client iterations.</span>
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="keywordflow">if</span> (++fRollingClientUsecsCnt % fRollingInterval == 0) {
<a name="l00064"></a>00064
<a name="l00065"></a>00065 jack_time_t max_usecs = 0;
<a name="l00066"></a>00066 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < JACK_ENGINE_ROLLING_COUNT; i++)
<a name="l00067"></a>00067 max_usecs = JACK_MAX(fRollingClientUsecs[i], max_usecs);
<a name="l00068"></a>00068
<a name="l00069"></a>00069 fMaxUsecs = JACK_MAX(fMaxUsecs, max_usecs);
<a name="l00070"></a>00070 fSpareUsecs = jack_time_t((max_usecs < fPeriodUsecs) ? fPeriodUsecs - max_usecs : 0);
<a name="l00071"></a>00071 fCPULoad = ((1.f - (float(fSpareUsecs) / float(fPeriodUsecs))) * 50.f + (fCPULoad * 0.5f));
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073 }
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="keywordtype">void</span> JackEngineControl::ResetRollingUsecs()
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077 memset(fRollingClientUsecs, 0, <span class="keyword">sizeof</span>(fRollingClientUsecs));
<a name="l00078"></a>00078 fRollingClientUsecsIndex = 0;
<a name="l00079"></a>00079 fRollingClientUsecsCnt = 0;
<a name="l00080"></a>00080 fSpareUsecs = 0;
<a name="l00081"></a>00081 fRollingInterval = int(floor((JACK_ENGINE_ROLLING_INTERVAL * 1000.f) / fPeriodUsecs));
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="keywordtype">void</span> JackEngineControl::NotifyXRun(jack_time_t callback_usecs, <span class="keywordtype">float</span> delayed_usecs)
<a name="l00085"></a>00085 {
<a name="l00086"></a>00086 ResetFrameTime(callback_usecs);
<a name="l00087"></a>00087 fXrunDelayedUsecs = delayed_usecs;
<a name="l00088"></a>00088 <span class="keywordflow">if</span> (delayed_usecs > fMaxDelayedUsecs)
<a name="l00089"></a>00089 fMaxDelayedUsecs = delayed_usecs;
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091
<a name="l00092"></a>00092 } <span class="comment">// end of namespace</span>
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