audiooutput

Leopold

"As for channel selection, what do you have in mind ?"
On one channel i want the sequenz with a doble pause after 17 tones and on the second channel (stereo) i want the sequenz with only tones and pauses.

Leopold

@SGaist said in audiooutput:

You can use a QTimer for the interval between two tones,

this is what I want to to but i can not figure out where to set the loop. When I try to debug the programm it runs for ever in background but never reaches the return app.exec in main.

SGaist

The you have to build your stereo data accordingly.

Start your QTimer when you want to start sending data or rather after you sent your first data to QAudioOutput.

app.exec() will return either when you close the last window of your application or call QApplication::quit from e.g. a menu action.

Leopold

now I had some time to play with this topic again:
I'm still wondering where to set my loop.I did it here```

void AudioTest::createAudioOutput()
{
delete m_audioOutput;
m_audioOutput = 0;
m_audioOutput = new QAudioOutput(m_device, m_format, this);
m_generator->start();
m_audioOutput->start(m_generator);
for (int i=0;i<17;i++)
{
m_audioOutput->stop();
connect(m_pushTimer, SIGNAL(timeout()), this, SLOT(update()));
m_pushTimer->start(1000);

  m_audioOutput->start(m_generator);
}

qreal initialVolume = QAudio::convertVolume(m_audioOutput->volume(),
                                            QAudio::LinearVolumeScale,
                                            QAudio::LogarithmicVolumeScale);
m_volumeSlider->setValue(qRound(initialVolume * 100));

}
I can compile but when it comes to running, i get a sigsev error from system.

SGaist

With that loop you are connecting the timeout signal 17 time, why ?

You should also post your backtrace.

Leopold

@SGaist said in audiooutput:

With that loop you are connecting the timeout signal 17 time, why ?

still the old problem, I want the rattling noise,then I'll continue to attapt the programm to my needs. I do not know where to place the loop.Could you have a look to the example programm and give me a hint?

aha_1980

@Leopold why do you need a loop? please explain.

you already have a timer and this timer call its SLOT every second. just do what you want there. if you want to stop, stop the timer.

regards

Leopold

@aha_1980
have you read the complete thread?
can you help, give me a hint!

SGaist

Did you try my suggestion of pre-generating the complete audio sequence ?

Leopold

no, if i generate a wav file, I can not change sequenzes while running.I could play wav.files with other means.There are complete programs for metronoms they are too big and nearly not changeable.There must be a possibility to change this small program to my needs.When I had a first look to it i thought its easy but now its a challenge. I have set the loop to different places but always get a sigsev error when app starts.

SGaist

I didn't write about any file. I suggested that you create an array of data containing your sequence. Array that you'd update following the parameters you change.

Leopold

I will think about that.Having sliders for changing tune, sequenze (loop) and duration of the gaps would have been more comfortable.

SGaist

When changing any of these parameters, you have to modify the generated data that you send to the audio output. So I don't see the problem there.