JackMMCSS.cpp
/*
Copyright (C) 2004-2008 Grame
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "JackMMCSS.h"
#include "JackError.h"
#include <assert.h>
#include <stdio.h>
namespace Jack
{
avSetMmThreadCharacteristics JackMMCSS::ffMMCSSFun1 = NULL;
avSetMmThreadPriority JackMMCSS::ffMMCSSFun2 = NULL;
avRevertMmThreadCharacteristics JackMMCSS::ffMMCSSFun3 = NULL;
JACK_HANDLE JackMMCSS::fAvrtDll;
std::map<jack_native_thread_t, HANDLE> JackMMCSS::fHandleTable;
JackMMCSS::JackMMCSS()
{
fAvrtDll = LoadJackModule("avrt.dll");
if (fAvrtDll != NULL) {
ffMMCSSFun1 = (avSetMmThreadCharacteristics)GetJackProc(fAvrtDll, "AvSetMmThreadCharacteristicsA");
ffMMCSSFun2 = (avSetMmThreadPriority)GetJackProc(fAvrtDll, "AvSetMmThreadPriority");
ffMMCSSFun3 = (avRevertMmThreadCharacteristics)GetJackProc(fAvrtDll, "AvRevertMmThreadCharacteristics");
}
}
JackMMCSS::~JackMMCSS()
{}
int JackMMCSS::MMCSSAcquireRealTime(jack_native_thread_t thread, int priority)
{
if (fHandleTable.find(thread) != fHandleTable.end()) {
return 0;
}
if (ffMMCSSFun1) {
DWORD dummy = 0;
HANDLE task = ffMMCSSFun1("Pro Audio", &dummy);
if (task == NULL) {
jack_error("AvSetMmThreadCharacteristics error : %d", GetLastError());
} else if (ffMMCSSFun2(task, Jack::AVRT_PRIORITY(priority - BASE_REALTIME_PRIORITY))) {
fHandleTable[thread] = task;
jack_log("AvSetMmThreadPriority success");
return 0;
} else {
jack_error("AvSetMmThreadPriority error : %d", GetLastError());
}
}
return -1;
}
int JackMMCSS::MMCSSDropRealTime(jack_native_thread_t thread)
{
if (fHandleTable.find(thread) != fHandleTable.end()) {
HANDLE task = fHandleTable[thread];
if (ffMMCSSFun3(task) == 0) {
jack_error("AvRevertMmThreadCharacteristics error : %d", GetLastError());
} else {
jack_log("AvRevertMmThreadCharacteristics success");
}
return 0;
} else {
return -1;
}
}
}
Jack
Definition: JackAC3Encoder.cpp:30
jack_error
SERVER_EXPORT void jack_error(const char *fmt,...)
Definition: JackError.cpp:92
jack_log
SERVER_EXPORT void jack_log(const char *fmt,...)
Definition: JackError.cpp:108