Phonon on symbian

gaucho

i'm new to QT. i'm tring to develop my first app on my nokia 5800 xm.
I installed all sdk (Qt SDK 1.1) and tools needed by qt on my windows desktop.
Then i built a empty qt mobility project where i added only a button.
The project (built on windows) runs without errors on my nokia.

In my project, i want to take an audio stream from microphone device and send
it to an output audio device.
I understood that i can use phonon class for my scope.

I only added on my mainWindow.cpp (at the beginning):
@#include <phonon/AudioOutput>@

..and on the button action i added:

@ Phonon::AudioOutput* pAudioOutput;

pAudioOutput = new Phonon::AudioOutput( Phonon::MusicCategory, this);
@

When i try to build the app i receive the following error:

warning: Can't find following headers in User or System Include Paths:
"audiooutput.h"

but if i go in C:\QtSDK\Symbian\SDKs\Symbian1Qt473\include\phonon i can find the audiooutput.h

What is wrong in my environment?

my easy test project can be downloaded from www.tr3ma.com/Dati/test2.zip

vinb

Hi put this in your pro file please:
Qt += core gui phonon

leon.anavi

Wow... I just saw the same topic in Italian and used Google Translate to understand it :D

vinb suggestion is correct! I has able to build you demo project by adding this line to test2.pro :

@QT += core gui phonon@

Best regards,
Leon

P.S.

Qt not QT :)

gaucho

Thank you Bro,
Happy to know it's not a dead forum.
now that it works,
i added the remaining part of the code in file mainWindow.cpp:

@
#include <phonon/AudioOutput>
#include <phonon/MediaObject>
#include <phonon/MediaSource>@

and in sub on_pushButton_clicked() i added:

      @
      Phonon::AudioOutput* pAudioOutput;
      pAudioOutput = new Phonon::AudioOutput(  Phonon::MusicCategory,  this);
      Phonon::MediaObject* pMediaObject ;
      pMediaObject = new Phonon::MediaObject(this);
      Phonon::createPath(pMediaObject, pAudioOutput);
      QString url= QString("e:\\Scream.wav");
      Phonon::MediaSource mediaSource = Phonon::MediaSource(url);
      pMediaObject ->setCurrentSource( mediaSource);
      pMediaObject->play();@

then i copied the file Scream.wav in the external memory (e:)
I verified that i can listen to this file on the default player of the phone.
And when i run the code, and press the button, the phone plays the wav.
Very good.

Now: How can i change the output device, choosing from available outputs? (for example in case i have 2 bluetooth headphone connected, and i want to stream a file only to one of these headphone).
I'll study on this question.

leon.anavi

Hi gaucho,

I am glad that the issue with audiooutput.h is solved.

[quote author="gaucho" date="1304086502"]
Now: How can i change the output device, choosing from available outputs? (for example in case i have 2 bluetooth headphone connected, and i want to stream a file only to one of these headphone).
I'll study on this question.
[/quote]

May be such a question deserves a separate thread :) I am not sure that Qt have such capabilities but if you are developing an app for Symbian (after all the forum title is Mobile and Embedded :) ) you can use Symbian C++ code to make "audio output routing ":http://wiki.forum.nokia.com/index.php/Audio_Routing_API_–_Input_and_Output

Cheers,
Leon

gaucho

Thank you Leon,
i found that article yesterday, but may be it's not the right class to use,
because the possible routes are only:

@enum TAudioOutputPreference {

ENoPreference, /// Used to indicate that the playing audio can be routed to
/// any speaker. This is the default value for audio.

EAll, /// Used to indicate that the playing audio should be routed
/// to all speakers.

ENoOutput, /// Used to indicate that the playing audio should not be routed
/// to any output.

EPrivate, /// Used to indicate that the playing audio should be routed to
/// the default private speaker. A private speaker is one that
/// can only be heard by one person.

EPublic, /// Used to indicate that the playing audio should be routed to
/// the default public speaker. A public speaker is one that can
/// be heard by multiple people.
};@

i can't read in that article, how to obtain and select available devices.

Maybe instead,
i can obtain available output devices with the following:

@QListPhonon::AudioOutputDevice audioOutputDevices = Phonon::BackendCapabilities::availableAudioOutputDevices();@

leon.anavi

[quote author="gaucho" date="1304154523"]i can't read in that article, how to obtain and select[/quote]

According to this article you can route the audio output to the default private speaker (EPrivate) and there should not be more that one default private speaker.
[quote author="gaucho" date="1304154523"]
Maybe instead,
i can obtain available output devices with the following:

@QListPhonon::AudioOutputDevice audioOutputDevices = Phonon::BackendCapabilities::availableAudioOutputDevices();@[/quote]

Did you manage to obtain available devices using this approach?

Best regards,
Leon

gaucho

I added to my project a combobox,
then i added the following include:
@#include < phonon/BackendCapabilities > @
and, on window creation routine, the following code:
@ QListPhonon::AudioOutputDevice devices = Phonon::BackendCapabilities::availableAudioOutputDevices();

    for (int i=0; i<devices.size(); i++){
        QString itemText = devices[i].name();
        if (!devices[i].description().isEmpty()) {
            itemText += QString::fromLatin1(" (%1)").arg(devices[i].description());
        }
        ui->comboBox->addItem(itemText);
    }@
    The combobox populates with only one value, even if i connect a bluetooth headphone.
    
    Am i doing something wrong? why i can't obtain 2 output devices?
    
    Thank you.

leon.anavi

@QListPhonon::AudioOutputDevice devices = Phonon::BackendCapabilities::availableAudioOutputDevices();
@

Let's ignore the GUI for a second. How many devices does the QList contain when you connect bluetooth headphone?

Regards,
Leon

Chuck Gao

hi, gaucho, you can try multimediakit.It's more convenient on Symbian development

gaucho

ok, if you know i can do these thigs i'll try. (i'll let you know).
may be i remember it wrong, but it seems to me that multimedia kit doesn't allow you to select the output device, but only the output "type".

Chuck Gao

[quote author="gaucho" date="1305642401"]ok, if you know i can do these thigs i'll try. (i'll let you know).
may be i remember it wrong, but it seems to me that multimedia kit doesn't allow you to select the output device, but only the output "type".[/quote]

you can get the device list via:
QList<QAudioDeviceInfo> QAudioDeviceInfo::availableDevices ( QAudio::Mode mode )
and use QAudioOutput to do the play work. You can also specify a output format. The only disadvantage i think, is the API didn't support setVolume function.