8 Apr
2009
8 Apr
'09
9:41 p.m.
Greetings,
I am trying to a connect a bare bones Qt-based client to the JACK audio server , and I am
running into a strange run-time error. I recently posted my question on the Qt-Interest
list but have had no luck. Maybe someone on this list would be kind enough to help...
my Setup is:
-Fedora 10 - 2.6.26.8-1.rt16.1.fc10.ccrma.i686.rt #1 SMP PREEMPT RT Tue Feb 17 15:48:24
EST 2009 i686 i686 i386 GNU/Linux
-Qt 4.50 (for Linux/X11)
-Jack audio connection kit
The .cpp files which cause this error are here:
******************
#include <QApplication>
#include "MainWindow.h"
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
MainWindow mainWindow;
mainWindow.show();
return app.exec();
}
*********************
#include "MainWindow.h"
MainWindow::MainWindow() {
QPushButton * b1 = new QPushButton("HELLO BUTTON",this);
audioEngine = new AudioEngine();
audioEngine->run();
}
MainWindow::~MainWindow() {
}
**********************
#include "AudioEngine.h"
using namespace std;
static int process(jack_nframes_t nframes, void *pvArg) {
AudioEngine * pAudioEngine = static_cast<AudioEngine *> (pvArg);
return pAudioEngine->audioEngineProcess(nframes);
}
int AudioEngine::audioEngineProcess(jack_nframes_t nframes) {
currFrame = nframes;
return 0;
}
AudioEngine::AudioEngine() {
}
AudioEngine::~AudioEngine() {
}
void AudioEngine::run() {
const char * client_name = "Template Player";
jack_options_t options = JackNullOption;
jack_status_t status;
// open a client connection to the JACK server
client = jack_client_open(client_name, options, &status);
if (client == NULL) {
fprintf(stderr, "jack_client_open() failed, status = 0x%2.0x\n", status);
if (status & JackServerFailed) {
fprintf(stderr, "Unable to connect to JACK server\n");
}
exit(1);
}
if (status & JackServerStarted)
fprintf(stderr, "JACK server started\n");
if (status & JackNameNotUnique) {
client_name = jack_get_client_name(client);
fprintf(stderr, "unique name `%s' assigned\n", client_name);
}
jack_set_process_callback(client, process, 0);
// jack_on_shutdown(client, jack_shutdown, 0);
//register the client ports
input_port = jack_port_register(client, "input", JACK_DEFAULT_AUDIO_TYPE,
JackPortIsInput, 0);
output_port = jack_port_register(client, "output", JACK_DEFAULT_AUDIO_TYPE,
JackPortIsOutput, 0);
if ((input_port == NULL) || (output_port == NULL)) {
fprintf(stderr, "no more JACK ports available\n");
exit(1);
}
jack_activate(client);
}
*************************
Everything compiles , but I am getting the following run-time error:
/usr/libexec/<unknown>: No such file or directory.
Cannot access memory at address 0x7
Cannot access memory at address 0x7
Not sure what this means... I have registered a
callback function with the JACK daemon and whenever
I try to access the member variable currFrame from
within the callback function I get that error.
Has anyone seen this error before?
-Thank You!