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Record Audio in Qt6

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  • JonBJ JonB

    @QtAndrew
    The QOverload<...>::of is to pick out a particular overload. The docs explain:

    Note: Signal error is overloaded in this class. To connect to this signal by using the function pointer syntax, Qt provides a convenient helper for obtaining the function pointer as shown in this example:

    See also https://doc.qt.io/qt-5/qtglobal.html#qOverload.

    You should show the error message.

    QtAndrewQ Offline
    QtAndrewQ Offline
    QtAndrew
    wrote on last edited by QtAndrew
    #8

    @JonB the examples are full of spelling mistakes. QOverload vs. qOverload. By the way, i am not able to put it into my example. Could it be that macos does not support the recording function?

    JonBJ 1 Reply Last reply
    0
    • Christian EhrlicherC Online
      Christian EhrlicherC Online
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #9

      @QtAndrew said in Record Audio in Qt6:

      the examples are full of spelling mistakes. QOverload vs. qOverload.

      Why not read the docs instead complaining for no reason? Both versions are valid and it's perfectly explained why there are two version. But looks like you're too lazy to read.

      Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
      Visit the Qt Academy at https://academy.qt.io/catalog

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      • QtAndrewQ QtAndrew

        @JonB the examples are full of spelling mistakes. QOverload vs. qOverload. By the way, i am not able to put it into my example. Could it be that macos does not support the recording function?

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by
        #10

        @QtAndrew
        There are no spelling mistakes. qOverload is not the same as QOverload. The page I referred you to shows that, and shows examples.

        By the way, i am not able to put it into my example.

        Twice you have said "it doesn't work" or "getting an error". I have asked you to show your code and paste the error you get. How can we answer without those details?

        QtAndrewQ 1 Reply Last reply
        2
        • JonBJ JonB

          @QtAndrew
          There are no spelling mistakes. qOverload is not the same as QOverload. The page I referred you to shows that, and shows examples.

          By the way, i am not able to put it into my example.

          Twice you have said "it doesn't work" or "getting an error". I have asked you to show your code and paste the error you get. How can we answer without those details?

          QtAndrewQ Offline
          QtAndrewQ Offline
          QtAndrew
          wrote on last edited by QtAndrew
          #11

          @JonB

              // RECORD
              QMediaCaptureSession* session = new QMediaCaptureSession();
              QAudioInput* audioInput = new QAudioInput();
              QMediaRecorder* recorder = new QMediaRecorder();
              session->setAudioInput(audioInput);
              session->setRecorder(recorder);
              recorder->setMediaFormat(QMediaFormat::Wave);
              recorder->setOutputLocation(QUrl::fromLocalFile("test"));
              recorder->setAudioSampleRate(48000);
              recorder->setAudioChannelCount(1);
              recorder->record();
          
              connect(recorder, QOverload<QMediaRecorder::Error>::of(&QMediaRecorder::error),
                  [=](QMediaRecorder::Error error){ /* ... */ });
          
              QTimer *timer = new QTimer(this);
              connect(timer, SIGNAL(timeout()), recorder, SLOT(stop()));
              timer->start(3500);
          

          ERROR: 1.) Does not Record any audio but the file is created (macos ARM64)
          ERROR: 2.)

          /Users/christoph/Documents/DEVELOPMENT/Impulse-Response-Extractor/IRExtractor/irextractor.cpp:44: Fehler: no matching function for call to 'of'
          ../IRExtractor/irextractor.cpp:44:23: error: no matching function for call to 'of'
          connect(recorder, QOverloadQMediaRecorder::Error::of(&QMediaRecorder::error),
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

          /Volumes/Externe-SSD/Development/Qt/6.2.0/macos/lib/QtCore.framework/Headers/qglobal.h:1345:27: note: candidate template ignored: failed template argument deduction
          static constexpr auto of(R (T::*ptr)(Args...) const) noexcept -> decltype(ptr)
          ^

          jsulmJ 1 Reply Last reply
          0
          • QtAndrewQ QtAndrew

            @JonB

                // RECORD
                QMediaCaptureSession* session = new QMediaCaptureSession();
                QAudioInput* audioInput = new QAudioInput();
                QMediaRecorder* recorder = new QMediaRecorder();
                session->setAudioInput(audioInput);
                session->setRecorder(recorder);
                recorder->setMediaFormat(QMediaFormat::Wave);
                recorder->setOutputLocation(QUrl::fromLocalFile("test"));
                recorder->setAudioSampleRate(48000);
                recorder->setAudioChannelCount(1);
                recorder->record();
            
                connect(recorder, QOverload<QMediaRecorder::Error>::of(&QMediaRecorder::error),
                    [=](QMediaRecorder::Error error){ /* ... */ });
            
                QTimer *timer = new QTimer(this);
                connect(timer, SIGNAL(timeout()), recorder, SLOT(stop()));
                timer->start(3500);
            

            ERROR: 1.) Does not Record any audio but the file is created (macos ARM64)
            ERROR: 2.)

            /Users/christoph/Documents/DEVELOPMENT/Impulse-Response-Extractor/IRExtractor/irextractor.cpp:44: Fehler: no matching function for call to 'of'
            ../IRExtractor/irextractor.cpp:44:23: error: no matching function for call to 'of'
            connect(recorder, QOverloadQMediaRecorder::Error::of(&QMediaRecorder::error),
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

            /Volumes/Externe-SSD/Development/Qt/6.2.0/macos/lib/QtCore.framework/Headers/qglobal.h:1345:27: note: candidate template ignored: failed template argument deduction
            static constexpr auto of(R (T::*ptr)(Args...) const) noexcept -> decltype(ptr)
            ^

            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #12

            @QtAndrew Since you're on Qt6 you should use https://doc-snapshots.qt.io/qt6-dev/qmediarecorder.html#errorOccurred
            And don't forget to print the error in the slot you connect to this signal.

            https://forum.qt.io/topic/113070/qt-code-of-conduct

            QtAndrewQ 2 Replies Last reply
            3
            • jsulmJ jsulm

              @QtAndrew Since you're on Qt6 you should use https://doc-snapshots.qt.io/qt6-dev/qmediarecorder.html#errorOccurred
              And don't forget to print the error in the slot you connect to this signal.

              QtAndrewQ Offline
              QtAndrewQ Offline
              QtAndrew
              wrote on last edited by QtAndrew
              #13
              This post is deleted!
              jsulmJ Christian EhrlicherC 2 Replies Last reply
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              • QtAndrewQ QtAndrew

                This post is deleted!

                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #14

                @QtAndrew said in Record Audio in Qt6:

                why does this code sniplet stand on 6.2 QMediaRecorder ?

                It does not. This code snippet is in Qt5 documentation, not in Qt6. I noticed from your compile log that you're using Qt6.2 and provided you the link to Qt6 documentation.
                Don't know what is unclear in the documentation...

                https://forum.qt.io/topic/113070/qt-code-of-conduct

                1 Reply Last reply
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                • QtAndrewQ QtAndrew

                  This post is deleted!

                  Christian EhrlicherC Online
                  Christian EhrlicherC Online
                  Christian Ehrlicher
                  Lifetime Qt Champion
                  wrote on last edited by Christian Ehrlicher
                  #15

                  @QtAndrew said in Record Audio in Qt6:

                  I think i change the platorform.

                  Please do so. Maybe you find a toolkit where the version is automatically guessed by your browser when you search for help.

                  Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                  Visit the Qt Academy at https://academy.qt.io/catalog

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                  • QtAndrewQ Offline
                    QtAndrewQ Offline
                    QtAndrew
                    wrote on last edited by
                    #16
                    This post is deleted!
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                    • QtAndrewQ Offline
                      QtAndrewQ Offline
                      QtAndrew
                      wrote on last edited by QtAndrew
                      #17

                      I tried:

                      1.) Threads
                      2.) Timers
                      3.) start the recording and connect the stop() to the player end of media slot.

                      no success...

                      void IRExtractor::on_sweepButton_clicked()
                      {
                          // PLAY
                          MyThread* t = new MyThread();
                          t->start();
                      
                          // RECORD
                          QMediaCaptureSession* session = new QMediaCaptureSession();
                          QAudioInput* audioInput = new QAudioInput();
                          QMediaRecorder* recorder = new QMediaRecorder();
                          session->setAudioInput(audioInput);
                          session->setRecorder(recorder);
                          recorder->setMediaFormat(QMediaFormat::Wave);
                          recorder->setOutputLocation(QUrl::fromLocalFile("test"));
                          recorder->setAudioSampleRate(48000);
                          recorder->setAudioChannelCount(1);
                          recorder->record();
                          QThread::msleep(3250);
                          recorder->stop();
                      }
                      
                      void MyThread::run()
                      {
                          QMediaPlayer* player = new QMediaPlayer();
                          QAudioOutput* audioOutput = new QAudioOutput;
                          audioOutput->setVolume(0.1);
                          player->setAudioOutput(audioOutput);
                          player->setSource(QUrl("qrc:/res/sweep.wav"));
                          player->play();
                      
                      }
                      

                      This version didn't play the audio.

                      The Project is now on GitHub: https://github.com/Christoph-Lauer/Impulse-Response-Extractor

                      JonBJ 1 Reply Last reply
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                      • jsulmJ jsulm

                        @QtAndrew Since you're on Qt6 you should use https://doc-snapshots.qt.io/qt6-dev/qmediarecorder.html#errorOccurred
                        And don't forget to print the error in the slot you connect to this signal.

                        QtAndrewQ Offline
                        QtAndrewQ Offline
                        QtAndrew
                        wrote on last edited by
                        #18
                        This post is deleted!
                        1 Reply Last reply
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                        • QtAndrewQ QtAndrew

                          I tried:

                          1.) Threads
                          2.) Timers
                          3.) start the recording and connect the stop() to the player end of media slot.

                          no success...

                          void IRExtractor::on_sweepButton_clicked()
                          {
                              // PLAY
                              MyThread* t = new MyThread();
                              t->start();
                          
                              // RECORD
                              QMediaCaptureSession* session = new QMediaCaptureSession();
                              QAudioInput* audioInput = new QAudioInput();
                              QMediaRecorder* recorder = new QMediaRecorder();
                              session->setAudioInput(audioInput);
                              session->setRecorder(recorder);
                              recorder->setMediaFormat(QMediaFormat::Wave);
                              recorder->setOutputLocation(QUrl::fromLocalFile("test"));
                              recorder->setAudioSampleRate(48000);
                              recorder->setAudioChannelCount(1);
                              recorder->record();
                              QThread::msleep(3250);
                              recorder->stop();
                          }
                          
                          void MyThread::run()
                          {
                              QMediaPlayer* player = new QMediaPlayer();
                              QAudioOutput* audioOutput = new QAudioOutput;
                              audioOutput->setVolume(0.1);
                              player->setAudioOutput(audioOutput);
                              player->setSource(QUrl("qrc:/res/sweep.wav"));
                              player->play();
                          
                          }
                          

                          This version didn't play the audio.

                          The Project is now on GitHub: https://github.com/Christoph-Lauer/Impulse-Response-Extractor

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #19

                          @QtAndrew
                          I do not know know anything about this, so no point asking me any further! But from your code are you supposed to some error checking as per https://forum.qt.io/topic/130588/qmediaplay-stream-does-not-wokk/2 ?

                          1 Reply Last reply
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                          • QtAndrewQ Offline
                            QtAndrewQ Offline
                            QtAndrew
                            wrote on last edited by
                            #20

                            changed to matlab --> https://github.com/Christoph-Lauer/Transfer-Function-Extractor-Matlab

                            1 Reply Last reply
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