audiooutput
-
You are right,
i have set a qtimer in genarateData now , but now the app does not start at all.
And yes qtimer wouldbe much easier.I would like to build a metronom out of this example.But like i said i do not completely understand the code.There is no comment to the code.Where can i place the loop and the timer.If i have an example for one interrupt i think i can extent to what I want.Or does anybody know the code for a programmable metronom? -
You are right,
i have set a qtimer in genarateData now , but now the app does not start at all.
And yes qtimer wouldbe much easier.I would like to build a metronom out of this example.But like i said i do not completely understand the code.There is no comment to the code.Where can i place the loop and the timer.If i have an example for one interrupt i think i can extent to what I want.Or does anybody know the code for a programmable metronom? -
@jsulm ,
hi, i do not think that I can solve it over the frequency.In the end state , i want to regulate the length of the pause and have an additional pause after 17 tones.Then I want the ability to set the anount of tones ( x instead of 17) and then regulate to which channel these tones will be output.
for3 tones: tone,pause,tone,pause,tone,pause,pause and the same loop again.
volume slider for volume,
rpmslider for length of timer timer.start(rpmslider->volume(),this)
tickslider for the amount of tones(x) -
There are several possibilities. You can use a QTimer for the interval between two tones, increment a counter each time you play it up to 17 (or in your case the variable you'll use to be able to set the number you want). As for the tone itself, like I suggested before you can build a QByteArray containing the audio data you need to send and the send it to the output.
As for channel selection, what do you have in mind ?
-
@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.
-
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. -
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. -
With that loop you are connecting the timeout signal 17 time, why ?
You should also post your backtrace.
-
@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?
-
@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?
-
@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
-
Did you try my suggestion of pre-generating the complete audio sequence ?
-
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.
-
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.
-
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.
