hyperion.ng/include/grabber/V4L2Grabber.h

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#pragma once
// stl includes
#include <vector>
#include <map>
// Qt includes
#include <QObject>
#include <QSocketNotifier>
#include <QRectF>
// util includes
#include <utils/PixelFormat.h>
#include <hyperion/Grabber.h>
#include <grabber/VideoStandard.h>
#include <utils/Components.h>
#ifdef HAVE_JPEG
#include <QImage>
#include <QColor>
#include <jpeglib.h>
#include <csetjmp>
#endif
/// Capture class for V4L2 devices
///
/// @see http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html
class V4L2Grabber : public Grabber
{
Q_OBJECT
public:
V4L2Grabber(const QString & device,
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VideoStandard videoStandard,
PixelFormat pixelFormat,
int pixelDecimation
);
virtual ~V4L2Grabber();
QRectF getSignalDetectionOffset()
{
return QRectF(_x_frac_min, _y_frac_min, _x_frac_max, _y_frac_max);
}
bool getSignalDetectionEnabled() { return _signalDetectionEnabled; }
int grabFrame(Image<ColorRgb> &);
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///
/// @brief overwrite Grabber.h implementation, as v4l doesn't use width/height
///
virtual void setWidthHeight(){};
///
/// @brief set new PixelDecimation value to ImageResampler
/// @param pixelDecimation The new pixelDecimation value
///
virtual void setPixelDecimation(int pixelDecimation);
///
/// @brief overwrite Grabber.h implementation
///
virtual void setSignalThreshold(
double redSignalThreshold,
double greenSignalThreshold,
double blueSignalThreshold,
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int noSignalCounterThreshold = 50);
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///
/// @brief overwrite Grabber.h implementation
///
virtual void setSignalDetectionOffset(
double verticalMin,
double horizontalMin,
double verticalMax,
double horizontalMax);
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///
/// @brief overwrite Grabber.h implementation
///
virtual void setSignalDetectionEnable(bool enable);
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///
/// @brief overwrite Grabber.h implementation
///
virtual void setDeviceVideoStandard(QString device, VideoStandard videoStandard);
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public slots:
bool start();
void stop();
void compStateChangeRequest(const hyperion::Components component, bool enable);
signals:
void newFrame(const Image<ColorRgb> & image);
void readError(const char* err);
private slots:
int read_frame();
private:
void getV4Ldevices();
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bool init();
void uninit();
bool open_device();
void close_device();
void init_read(unsigned int buffer_size);
void init_mmap();
void init_userp(unsigned int buffer_size);
void init_device(VideoStandard videoStandard, int input);
void uninit_device();
void start_capturing();
void stop_capturing();
bool process_image(const void *p, int size);
void process_image(const uint8_t *p, int size);
int xioctl(int request, void *arg);
void throw_exception(const QString & error)
{
Error(_log, "Throws error: %s", QSTRING_CSTR(error));
}
void throw_errno_exception(const QString & error)
{
Error(_log, "Throws error nr: %s", QSTRING_CSTR(QString(error + " error code " + QString::number(errno) + ", " + strerror(errno))));
}
private:
enum io_method
{
IO_METHOD_READ,
IO_METHOD_MMAP,
IO_METHOD_USERPTR
};
struct buffer
{
void *start;
size_t length;
};
#ifdef HAVE_JPEG
struct errorManager
{
jpeg_error_mgr pub;
jmp_buf setjmp_buffer;
};
static void errorHandler(j_common_ptr cInfo)
{
errorManager* mgr = reinterpret_cast<errorManager*>(cInfo->err);
longjmp(mgr->setjmp_buffer, 1);
}
static void outputHandler(j_common_ptr cInfo)
{
// Suppress fprintf warnings.
}
jpeg_decompress_struct* _decompress;
errorManager* _error;
#endif
private:
QString _deviceName;
std::map<QString,QString> _v4lDevices;
int _input;
VideoStandard _videoStandard;
io_method _ioMethod;
int _fileDescriptor;
std::vector<buffer> _buffers;
PixelFormat _pixelFormat;
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int _pixelDecimation;
int _lineLength;
int _frameByteSize;
// signal detection
int _noSignalCounterThreshold;
ColorRgb _noSignalThresholdColor;
bool _signalDetectionEnabled;
bool _noSignalDetected;
int _noSignalCounter;
double _x_frac_min;
double _y_frac_min;
double _x_frac_max;
double _y_frac_max;
QSocketNotifier *_streamNotifier;
bool _initialized;
bool _deviceAutoDiscoverEnabled;
};