diff options
Diffstat (limited to 'src/plugins/avfoundation/camera/avfimagecapturecontrol.mm')
| -rw-r--r-- | src/plugins/avfoundation/camera/avfimagecapturecontrol.mm | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/src/plugins/avfoundation/camera/avfimagecapturecontrol.mm b/src/plugins/avfoundation/camera/avfimagecapturecontrol.mm index b59aa7bfd..bad1b362b 100644 --- a/src/plugins/avfoundation/camera/avfimagecapturecontrol.mm +++ b/src/plugins/avfoundation/camera/avfimagecapturecontrol.mm @@ -54,6 +54,7 @@ QT_USE_NAMESPACE AVFImageCaptureControl::AVFImageCaptureControl(AVFCameraService *service, QObject *parent) : QCameraImageCaptureControl(parent) + , m_service(service) , m_session(service->session()) , m_cameraControl(service->cameraControl()) , m_ready(false) @@ -68,7 +69,6 @@ AVFImageCaptureControl::AVFImageCaptureControl(AVFCameraService *service, QObjec [m_stillImageOutput setOutputSettings:outputSettings]; [outputSettings release]; - connect(m_cameraControl, SIGNAL(captureModeChanged(QCamera::CaptureModes)), SLOT(updateReadyStatus())); connect(m_cameraControl, SIGNAL(statusChanged(QCamera::Status)), SLOT(updateReadyStatus())); @@ -119,7 +119,7 @@ int AVFImageCaptureControl::capture(const QString &fileName) qDebugCamera() << "Capture image to" << actualFileName; - CaptureRequest request = { m_lastCaptureId, new QSemaphore }; + CaptureRequest request = { m_lastCaptureId, QSharedPointer<QSemaphore>::create()}; m_requestsMutex.lock(); m_captureRequests.enqueue(request); m_requestsMutex.unlock(); @@ -127,10 +127,6 @@ int AVFImageCaptureControl::capture(const QString &fileName) [m_stillImageOutput captureStillImageAsynchronouslyFromConnection:m_videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) { - // Wait for the preview to be generated before saving the JPEG - request.previewReady->acquire(); - delete request.previewReady; - if (error) { QStringList messageParts; messageParts << QString::fromUtf8([[error localizedDescription] UTF8String]); @@ -144,7 +140,19 @@ int AVFImageCaptureControl::capture(const QString &fileName) Q_ARG(int, request.captureId), Q_ARG(int, QCameraImageCapture::ResourceError), Q_ARG(QString, errorMessage)); - } else { + return; + } + + // Wait for the preview to be generated before saving the JPEG (but only + // if we have AVFCameraRendererControl attached). + // It is possible to stop camera immediately after trying to capture an + // image; this can result in a blocked callback's thread, waiting for a + // new viewfinder's frame to arrive/semaphore to be released. It is also + // unspecified on which thread this callback gets executed, (probably it's + // not the same thread that initiated a capture and stopped the camera), + // so we cannot reliably check the camera's status. Instead, we wait + // with a timeout and treat a failure to acquire a semaphore as an error. + if (!m_service->videoOutput() || request.previewReady->tryAcquire(1, 1000)) { qDebugCamera() << "Image capture completed:" << actualFileName; NSData *nsJpgData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer]; @@ -169,6 +177,14 @@ int AVFImageCaptureControl::capture(const QString &fileName) Q_ARG(int, QCameraImageCapture::ResourceError), Q_ARG(QString, errorMessage)); } + } else { + const QLatin1String errorMessage("Image capture failed: timed out waiting" + " for a preview frame."); + qDebugCamera() << errorMessage; + QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection, + Q_ARG(int, request.captureId), + Q_ARG(int, QCameraImageCapture::ResourceError), + Q_ARG(QString, errorMessage)); } }]; |