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| |
| /*! |
| \class QAudioProbe |
| \inmodule QtMultimedia |
| |
| \ingroup multimedia |
| \ingroup multimedia_audio |
| |
| \brief The QAudioProbe class allows you to monitor audio being played or recorded. |
| |
| \snippet multimedia-snippets/qaudioprobe.cpp desc |
| |
| \sa QVideoProbe, QMediaPlayer, QCamera |
| */ |
| |
| #include "qaudioprobe.h" |
| #include "qmediaaudioprobecontrol.h" |
| #include "qmediaservice.h" |
| #include "qmediarecorder.h" |
| #include "qsharedpointer.h" |
| #include "qpointer.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| class QAudioProbePrivate { |
| public: |
| QPointer<QMediaObject> source; |
| QPointer<QMediaAudioProbeControl> probee; |
| }; |
| |
| /*! |
| Creates a new QAudioProbe class with a \a parent. After setting the |
| source to monitor with \l setSource(), the \l audioBufferProbed() |
| signal will be emitted when audio buffers are flowing in the |
| source media object. |
| */ |
| QAudioProbe::QAudioProbe(QObject *parent) |
| : QObject(parent) |
| , d(new QAudioProbePrivate) |
| { |
| } |
| |
| /*! |
| Destroys this probe and disconnects from any |
| media object. |
| */ |
| QAudioProbe::~QAudioProbe() |
| { |
| if (d->source) { |
| // Disconnect |
| if (d->probee) { |
| disconnect(d->probee.data(), SIGNAL(audioBufferProbed(QAudioBuffer)), this, SIGNAL(audioBufferProbed(QAudioBuffer))); |
| disconnect(d->probee.data(), SIGNAL(flush()), this, SIGNAL(flush())); |
| } |
| d->source.data()->service()->releaseControl(d->probee.data()); |
| } |
| } |
| |
| /*! |
| Sets the media object to monitor to \a source. |
| |
| If \a source is zero, this probe will be deactivated |
| and this function wil return true. |
| |
| If the media object does not support monitoring |
| audio, this function will return false. |
| |
| The previous object will no longer be monitored. |
| Passing in the same object will be ignored, but |
| monitoring will continue. |
| */ |
| bool QAudioProbe::setSource(QMediaObject *source) |
| { |
| // Need to: |
| // 1) disconnect from current source if necessary |
| // 2) see if new one has the probe control |
| // 3) connect if so |
| |
| // in case source was destroyed but probe control is still valid |
| if (!d->source && d->probee) { |
| disconnect(d->probee.data(), SIGNAL(audioBufferProbed(QAudioBuffer)), this, SIGNAL(audioBufferProbed(QAudioBuffer))); |
| disconnect(d->probee.data(), SIGNAL(flush()), this, SIGNAL(flush())); |
| d->probee.clear(); |
| } |
| |
| if (source != d->source.data()) { |
| if (d->source) { |
| Q_ASSERT(d->probee); |
| disconnect(d->probee.data(), SIGNAL(audioBufferProbed(QAudioBuffer)), this, SIGNAL(audioBufferProbed(QAudioBuffer))); |
| disconnect(d->probee.data(), SIGNAL(flush()), this, SIGNAL(flush())); |
| d->source.data()->service()->releaseControl(d->probee.data()); |
| d->source.clear(); |
| d->probee.clear(); |
| } |
| |
| if (source) { |
| QMediaService *service = source->service(); |
| if (service) { |
| d->probee = service->requestControl<QMediaAudioProbeControl*>(); |
| } |
| |
| if (d->probee) { |
| connect(d->probee.data(), SIGNAL(audioBufferProbed(QAudioBuffer)), this, SIGNAL(audioBufferProbed(QAudioBuffer))); |
| connect(d->probee.data(), SIGNAL(flush()), this, SIGNAL(flush())); |
| d->source = source; |
| } |
| } |
| } |
| |
| return (!source || d->probee != nullptr); |
| } |
| |
| /*! |
| Starts monitoring the given \a mediaRecorder. |
| |
| Returns true on success. |
| |
| If there is no mediaObject associated with \a mediaRecorder, or if it is |
| zero, this probe will be deactivated and this function wil return true. |
| |
| If the media recorder instance does not support monitoring |
| audio, this function will return false. |
| |
| Any previously monitored objects will no longer be monitored. |
| Passing in the same (valid) object will be ignored, but |
| monitoring will continue. |
| */ |
| bool QAudioProbe::setSource(QMediaRecorder *mediaRecorder) |
| { |
| QMediaObject *source = mediaRecorder ? mediaRecorder->mediaObject() : nullptr; |
| bool result = setSource(source); |
| |
| if (!mediaRecorder) |
| return true; |
| |
| if (mediaRecorder && !source) |
| return false; |
| |
| return result; |
| } |
| |
| /*! |
| Returns true if this probe is monitoring something, or false otherwise. |
| |
| The source being monitored does not need to be active. |
| */ |
| bool QAudioProbe::isActive() const |
| { |
| return d->probee != nullptr; |
| } |
| |
| /*! |
| \fn QAudioProbe::audioBufferProbed(const QAudioBuffer &buffer) |
| |
| This signal should be emitted when an audio \a buffer is processed in the |
| media service. |
| */ |
| |
| |
| /*! |
| \fn QAudioProbe::flush() |
| |
| This signal should be emitted when it is required to release all buffers. |
| Application must release all outstanding references to audio buffers. |
| */ |
| |
| QT_END_NAMESPACE |