/*
* viewfinder_callback
*
* This callback is invoked when an image frame from the camera viewfinder becomes available.
* The frame is analyzed to determine if a barcode can be matched.
* Frames come in NV12 format which makes code analysis very fast.
*/
void viewfinder_callback(camera_handle_t handle,camera_buffer_t* buf,void* arg) {
camera_frame_nv12_t* data = (camera_frame_nv12_t*)(&(buf->framedesc));
uint8_t* buff = buf->framebuf;
int stride = data->stride;
int width = data->width;
int height = data->height;
try {
Ref<LuminanceSource> source(new GreyscaleLuminanceSource((unsigned char *)buff, stride, height, 0,0,width,height));
Ref<Binarizer> binarizer(new HybridBinarizer(source));
Ref<BinaryBitmap> bitmap(new BinaryBitmap(binarizer));
Ref<Result> result;
// setup the code reader
MultiFormatReader *reader = new MultiFormatReader();
DecodeHints *hints = new DecodeHints();
hints->addFormat(BarcodeFormat_QR_CODE);
hints->addFormat(BarcodeFormat_EAN_8);
hints->addFormat(BarcodeFormat_EAN_13);
hints->addFormat(BarcodeFormat_UPC_A);
hints->addFormat(BarcodeFormat_UPC_E);
hints->addFormat(BarcodeFormat_DATA_MATRIX);
hints->addFormat(BarcodeFormat_CODE_128);
hints->addFormat(BarcodeFormat_CODE_39);
hints->addFormat(BarcodeFormat_ITF);
hints->addFormat(BarcodeFormat_AZTEC);
// attempt to decode and retrieve a valid QR code from the image bitmap
result = reader->decode(bitmap, *hints);
std::string newBarcodeData = result->getText()->getText().data();
Json::FastWriter writer;
Json::Value root;
root["value"] = newBarcodeData;
std::string event = "community.barcodescanner.codefound.native";
// notify caller that a valid QR code has been decoded
if ( eventDispatcher != NULL){
eventDispatcher->NotifyEvent(event + " " + writer.write(root));
}
#ifdef DEBUG
fprintf(stderr, "This is the detected Barcode : %s\n", newBarcodeData.c_str());
#endif
}
catch (const std::exception& ex)
{
#ifdef DEBUG
fprintf( stderr, "error occured : \%s \n", ex.what());
#endif
}
}
//! [0]
BarcodeDecoderControl::BarcodeDecoderControl(Container *parent)
: CustomControl(parent)
, m_camera(new Camera(parent))
, m_cameraSettings(new CameraSettings(this))
, m_landscapePreviewFrames(false)
, m_nbuffers(2)
{
setRoot(m_camera);
connect(m_camera, SIGNAL(cameraOpened()),
this, SLOT(onCameraOpened()));
connect(m_camera, SIGNAL(viewfinderStarted()),
this, SLOT(viewfinderStarted()));
connect(m_camera, SIGNAL(viewfinderStopped()),
this, SLOT(onViewfinderStopped()));
//Prepare the camera
m_camera->open(CameraUnit::Rear);
//Configure camera settings
m_camera->getSettings(m_cameraSettings);
m_cameraSettings->setCameraMode(CameraMode::Photo);
m_cameraSettings->setFocusMode(CameraFocusMode::ContinuousMacro);
if (m_camera->applySettings(m_cameraSettings))
qDebug() << "settings applied successfully";
//Prepare the decoder
m_reader = Ref<MultiFormatReader>(new MultiFormatReader());
DecodeHints *hints = new DecodeHints();
hints->addFormat(BarcodeFormat_QR_CODE);
hints->addFormat(BarcodeFormat_EAN_8);
hints->addFormat(BarcodeFormat_EAN_13);
hints->addFormat(BarcodeFormat_UPC_A);
hints->addFormat(BarcodeFormat_UPC_E);
hints->addFormat(BarcodeFormat_DATA_MATRIX);
hints->addFormat(BarcodeFormat_CODE_128);
hints->addFormat(BarcodeFormat_CODE_39);
hints->addFormat(BarcodeFormat_ITF);
hints->addFormat(BarcodeFormat_AZTEC);
m_reader.object_->setHints(*hints);
}
void TcZXing::setDecoder(DecoderFormatType hint)
{
DecodeHints newHints;
if(hint & DecoderFormat_QR_CODE)
newHints.addFormat((BarcodeFormat)BarcodeFormat_QR_CODE);
if(hint & DecoderFormat_DATA_MATRIX)
newHints.addFormat((BarcodeFormat)BarcodeFormat_DATA_MATRIX);
if(hint & DecoderFormat_UPC_E)
newHints.addFormat((BarcodeFormat)BarcodeFormat_UPC_E);
if(hint & DecoderFormat_UPC_A)
newHints.addFormat((BarcodeFormat)BarcodeFormat_UPC_A);
if(hint & DecoderFormat_EAN_8)
newHints.addFormat((BarcodeFormat)BarcodeFormat_EAN_8);
if(hint & DecoderFormat_EAN_13)
newHints.addFormat((BarcodeFormat)BarcodeFormat_EAN_13);
if(hint & DecoderFormat_CODE_128)
newHints.addFormat((BarcodeFormat)BarcodeFormat_CODE_128);
if(hint & DecoderFormat_CODE_39)
newHints.addFormat((BarcodeFormat)BarcodeFormat_CODE_39);
if(hint & DecoderFormat_ITF)
newHints.addFormat((BarcodeFormat)BarcodeFormat_ITF);
if(hint & DecoderFormat_Aztec)
newHints.addFormat((BarcodeFormat)BarcodeFormat_AZTEC);
supportedFormats = newHints.getCurrentHint();
}