opencv/modules/videoio/src/cap_aravis.cpp

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// The code has been contributed by Arkadiusz Raj on 2016 Oct
//

#include "precomp.hpp"

#ifdef HAVE_ARAVIS_API

#include <arv.h>

/********************* Capturing video from camera via Aravis *********************/

class CvCaptureCAM_Aravis : public CvCapture
{
public:
    CvCaptureCAM_Aravis();
    virtual ~CvCaptureCAM_Aravis()
    {
        close();
    }

    virtual bool open(int);
    virtual void close();
    virtual double getProperty(int) const;
    virtual bool setProperty(int, double);
    virtual bool grabFrame();
    virtual IplImage* retrieveFrame(int);
    virtual int getCaptureDomain()
    {
        return CV_CAP_ARAVIS;
    }

protected:
    bool create(int);
    bool init();

    void stopCapture();
    bool startCapture();

    bool getDeviceNameById(int id, std::string &device);

    ArvCamera       *camera;                // Camera to control.
    ArvStream       *stream;                // Object for video stream reception.
    void            *framebuffer;           //

    unsigned int    payload;                // Width x height x Pixel width.

    int             widthMin;               // Camera sensor minium width.
    int             widthMax;               // Camera sensor maximum width.
    int             heightMin;              // Camera sensor minium height.
    int             heightMax;              // Camera sensor maximum height.
    double          fpsMin;                 // Camera minium fps.
    double          fpsMax;                 // Camera maximum fps.
    double          gainMin;                // Camera minimum gain.
    double          gainMax;                // Camera maximum gain.
    double          exposureMin;            // Camera's minimum exposure time.
    double          exposureMax;            // Camera's maximum exposure time.

    int             num_buffers;            // number of payload transmission buffers

    IplImage *frame;
};


CvCaptureCAM_Aravis::CvCaptureCAM_Aravis()
{
    camera = NULL;
    stream = NULL;
    framebuffer = NULL;

    payload = 0;

    widthMin = widthMax = heightMin = heightMax = 0;
    fpsMin = fpsMax = gainMin = gainMax = exposureMin = exposureMax = 0;

    num_buffers = 50;

    frame = NULL;
}

void CvCaptureCAM_Aravis::close()
{
    stopCapture();
}

bool CvCaptureCAM_Aravis::getDeviceNameById(int id, std::string &device)
{
    arv_update_device_list();

    int n_devices = arv_get_n_devices();

    for(int i = 0; i< n_devices; i++){
        if(id == i){
            device = arv_get_device_id(i);
            return true;
        }
    }

    return false;
}

bool CvCaptureCAM_Aravis::create( int index )
{
    std::string deviceName;
    if(!getDeviceNameById(index, deviceName))
        return false;

    return NULL != (camera = arv_camera_new(deviceName.c_str()));
}

bool CvCaptureCAM_Aravis::init()
{
    if( (stream = arv_camera_create_stream(camera, NULL, NULL)) ) {
        g_object_set(stream,
            "socket-buffer", ARV_GV_STREAM_SOCKET_BUFFER_AUTO,
            "socket-buffer-size", 0, NULL);
        g_object_set(stream,
            "packet-resend", ARV_GV_STREAM_PACKET_RESEND_NEVER, NULL);
        g_object_set(stream,
            "packet-timeout", (unsigned)40000,
            "frame-retention", (unsigned) 200000, NULL);

        for (int i = 0; i < num_buffers; i++)
            arv_stream_push_buffer(stream, arv_buffer_new(payload, NULL));

        return true;
    }

    return false;
}

// Initialize camera input
bool CvCaptureCAM_Aravis::open( int index )
{
    if( create( index) ) {
        // fetch basic properties
        payload = arv_camera_get_payload (camera);
        arv_camera_get_width_bounds(camera, &widthMin, &widthMax);
        arv_camera_get_height_bounds(camera, &heightMin, &heightMax);
        arv_camera_get_frame_rate_bounds(camera, &fpsMin, &fpsMax);
        arv_camera_get_gain_bounds (camera, &gainMin, &gainMax);
        arv_camera_get_exposure_time_bounds (camera, &exposureMin, &exposureMax);

        // enforce mono 8 format
        arv_camera_set_pixel_format(camera, ARV_PIXEL_FORMAT_MONO_8);

        // init communication
        init();

        return startCapture();
    }
    return false;
}

bool CvCaptureCAM_Aravis::grabFrame()
{
    ArvBuffer *arv_buffer = arv_stream_timeout_pop_buffer(stream, 2000000); //us
    if(arv_buffer != NULL) {
        if(arv_buffer_get_status(arv_buffer) == ARV_BUFFER_STATUS_SUCCESS) {
            size_t buffer_size;
            framebuffer = (void*)arv_buffer_get_data (arv_buffer, &buffer_size);
        }
        arv_stream_push_buffer(stream, arv_buffer);
        return true;
    }
    framebuffer = NULL;
    return false;
}

IplImage* CvCaptureCAM_Aravis::retrieveFrame(int)
{
    if(framebuffer) {
        IplImage src;
        cvInitImageHeader( &src, cvSize( widthMax, heightMax ),
                           IPL_DEPTH_8U, 1, IPL_ORIGIN_TL, 4 );

        cvSetData( &src, framebuffer, src.widthStep );
        if( !frame || frame->width != src.width || frame->height != src.height ) {
            cvReleaseImage( &frame );
            frame = cvCreateImage( cvGetSize(&src), 8, 1 );
        }
        cvCopy(&src, frame);

        return frame;
    }
    return NULL;
}

double CvCaptureCAM_Aravis::getProperty( int property_id ) const
{
    switch ( property_id ) {
        case CV_CAP_PROP_EXPOSURE:
            return arv_camera_get_exposure_time(camera);

        case CV_CAP_PROP_FPS:
            return arv_camera_get_frame_rate(camera);

        case CV_CAP_PROP_GAIN:
            return arv_camera_get_gain(camera);
    }
    return -1.0;
}

bool CvCaptureCAM_Aravis::setProperty( int property_id, double value )
{
    switch ( property_id ) {
        case CV_CAP_PROP_EXPOSURE:
            arv_camera_set_exposure_time(camera, value);
            break;

        case CV_CAP_PROP_FPS:
            arv_camera_set_frame_rate(camera, value);
            break;

        case CV_CAP_PROP_GAIN:
            arv_camera_set_gain(camera, value);
            break;
    }
    return -1.0 != getProperty( property_id );
}

void CvCaptureCAM_Aravis::stopCapture()
{
    arv_camera_stop_acquisition(camera);

    g_object_unref(stream);
    stream = NULL;

    g_object_unref(camera);
}

bool CvCaptureCAM_Aravis::startCapture()
{
    arv_camera_set_acquisition_mode(camera, ARV_ACQUISITION_MODE_CONTINUOUS);
    arv_device_set_string_feature_value(arv_camera_get_device (camera), "TriggerMode" , "Off");
    arv_camera_start_acquisition(camera);

    return true;
}

CvCapture* cvCreateCameraCapture_Aravis( int index )
{
    CvCaptureCAM_Aravis* capture = new CvCaptureCAM_Aravis;

    if ( capture->open( index ))
        return capture;

    delete capture;
    return NULL;
}
#endif