Added frame buffer grabber support

Former-commit-id: a73767a1abb2cac977492bd8c6cc593fb21840e1

libsrc/grabber/framebuffer/CMakeLists.txt

@@ -0,0 +1,35 @@
+
+# Find the BCM-package (VC control)
+# find_package(BCM REQUIRED)
+# include_directories(${BCM_INCLUDE_DIRS})
+
+# Define the current source locations
+SET(CURRENT_HEADER_DIR ${CMAKE_SOURCE_DIR}/include/grabber)
+SET(CURRENT_SOURCE_DIR ${CMAKE_SOURCE_DIR}/libsrc/grabber/framebuffer)
+
+# Group the headers that go through the MOC compiler
+SET(FramebufferGrabberQT_HEADERS
+		${CURRENT_HEADER_DIR}/FramebufferWrapper.h
+)
+
+SET(FramebufferGrabberHEADERS
+		${CURRENT_SOURCE_DIR}/FramebufferFrameGrabber.h
+)
+
+SET(FramebufferGrabberSOURCES
+		${CURRENT_SOURCE_DIR}/FramebufferWrapper.cpp
+		${CURRENT_SOURCE_DIR}/FramebufferFrameGrabber.cpp
+)
+
+QT4_WRAP_CPP(FramebufferGrabberHEADERS_MOC ${FramebufferGrabberQT_HEADERS})
+
+add_library(framebuffer-grabber
+		${FramebufferGrabberHEADERS}
+		${FramebufferGrabberQT_HEADERS}
+		${FramebufferGrabberHEADERS_MOC}
+		${FramebufferGrabberSOURCES}
+)
+
+target_link_libraries(framebuffer-grabber
+		hyperion
+		${QT_LIBRARIES})

libsrc/grabber/framebuffer/FramebufferFrameGrabber.cpp

@@ -0,0 +1,123 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/fb.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include <math.h>
+
+// STL includes
+#include <cassert>
+#include <iostream>
+
+// Local includes
+#include "FramebufferFrameGrabber.h"
+
+FramebufferFrameGrabber::FramebufferFrameGrabber(const std::string & device, const unsigned width, const unsigned height) :
+	_fbfd(0),
+	_fbp(0),
+	_fbDevice(device),
+	_width(width),
+	_height(height),
+	_xScale(1),
+	_yScale(1)
+{
+	int result;
+	struct fb_var_screeninfo vinfo;
+
+	// Check if the framebuffer device can be opened and display the current resolution
+	_fbfd = open(_fbDevice.c_str(), O_RDONLY);
+	assert(_fbfd > 0);
+
+	// get variable screen information
+	result = ioctl (_fbfd, FBIOGET_VSCREENINFO, &vinfo);
+	assert(result == 0);
+
+	std::cout << "Framebuffer opened with resolution: " << vinfo.xres << "x" << vinfo.yres << "@" << vinfo.bits_per_pixel << "bit" << std::endl;
+
+	close(_fbfd);
+}
+
+FramebufferFrameGrabber::~FramebufferFrameGrabber()
+{
+}
+
+void FramebufferFrameGrabber::setVideoMode(const VideoMode videoMode)
+{
+	switch (videoMode) {
+	case VIDEO_3DSBS:
+		_xScale = 2;
+		_yScale = 1;
+		break;
+	case VIDEO_3DTAB:
+		_xScale = 1;
+		_yScale = 2;
+		break;
+	case VIDEO_2D:
+	default:
+		_xScale = 1;
+		_yScale = 1;
+		break;
+	}
+}
+
+void FramebufferFrameGrabber::grabFrame(Image<ColorRgba> & image)
+{
+	struct fb_var_screeninfo vinfo;
+	unsigned capSize, px, py, index, bytesPerPixel;
+	float x_scale, y_scale;
+
+	/* resize the given image if needed */
+	if (image.width() != _width || image.height() != _height)
+	{
+		image.resize(_width, _height);
+	}
+
+	/* Open the framebuffer device */
+	_fbfd = open(_fbDevice.c_str(), O_RDONLY);
+
+	/* get variable screen information */
+	ioctl (_fbfd, FBIOGET_VSCREENINFO, &vinfo);
+
+	bytesPerPixel = vinfo.bits_per_pixel / 8;
+	capSize = vinfo.xres * vinfo.yres * bytesPerPixel;
+		
+	/* map the device to memory */
+	_fbp = (unsigned char*)mmap(0, capSize, PROT_READ, MAP_PRIVATE | MAP_NORESERVE, _fbfd, 0);	
+
+	/* nearest neighbor downscaling */
+    x_scale = (vinfo.xres / float(_xScale)) / float(_width);
+    y_scale = (vinfo.yres / float(_yScale)) / float(_height);
+
+	ColorRgba *pPixel = image.memptr();
+	for (unsigned i=0; i < _height; i++) {
+		for (unsigned j=0; j < _width; j++) {
+			px = floor(j * x_scale);
+			py = floor(i * y_scale);
+			index = (py * vinfo.xres + px) * bytesPerPixel;
+
+			if (vinfo.bits_per_pixel == 16) {
+				pPixel->blue = (_fbp[index] & 0x1f) << 3;
+				pPixel->green = (((_fbp[index + 1] & 0x7) << 3) | (_fbp[index] & 0xE0) >> 5) << 2;
+				pPixel->red = (_fbp[index + 1] & 0xF8);
+				pPixel->alpha = 255;
+			} else if(vinfo.bits_per_pixel == 24) {
+				pPixel->blue = _fbp[index];
+				pPixel->green = _fbp[index + 1];
+				pPixel->red = _fbp[index + 2];
+				pPixel->alpha = 255;
+			} else if(vinfo.bits_per_pixel == 32) {
+				pPixel->blue = _fbp[index];
+				pPixel->green = _fbp[index + 1];
+				pPixel->red = _fbp[index + 2];
+				pPixel->alpha = _fbp[index + 3];
+			}
+			
+			pPixel++;
+		}
+	}
+	
+	munmap(_fbp, capSize);
+	close(_fbfd);
+}

libsrc/grabber/framebuffer/FramebufferFrameGrabber.h

@@ -0,0 +1,61 @@
+#pragma once
+
+// Utils includes
+#include <utils/Image.h>
+#include <utils/ColorRgba.h>
+#include <utils/VideoMode.h>
+
+///
+/// The FramebufferFrameGrabber is used for creating snapshots of the display (screenshots) 
+///
+class FramebufferFrameGrabber
+{
+public:
+	///
+	/// Construct a FramebufferFrameGrabber that will capture snapshots with specified dimensions.
+	///
+	/// @param[in] device The framebuffer device name/path
+	/// @param[in] width  The width of the captured screenshot
+	/// @param[in] height The heigth of the captured screenshot
+	///
+	FramebufferFrameGrabber(const std::string & device, const unsigned width, const unsigned height);
+	~FramebufferFrameGrabber();
+
+	///
+	/// Set the video mode (2D/3D)
+	/// @param[in] mode The new video mode
+	///
+	void setVideoMode(const VideoMode videoMode);
+
+	///
+	/// Captures a single snapshot of the display and writes the data to the given image. The
+	/// provided image should have the same dimensions as the configured values (_width and
+	/// _height)
+	///
+	/// @param[out] image  The snapped screenshot (should be initialized with correct width and
+	/// height)
+	///
+	void grabFrame(Image<ColorRgba> & image);
+
+private:
+	/// Framebuffer file descriptor
+	int _fbfd;
+
+	/// Pointer to framebuffer
+	unsigned char * _fbp;
+	
+	/// Framebuffer device e.g. /dev/fb0
+	const std::string _fbDevice;
+	
+	/// With of the captured snapshot [pixels]
+	const unsigned _width;
+	
+	/// Height of the captured snapshot [pixels]
+	const unsigned _height;
+
+	/// width scale factor for 3D image processing
+	float _xScale;
+	
+	/// height scale factor for 3D image processing
+	float _yScale;
+};

libsrc/grabber/framebuffer/FramebufferWrapper.cpp

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+// Hyperion includes
+#include <hyperion/Hyperion.h>
+#include <hyperion/ImageProcessorFactory.h>
+#include <hyperion/ImageProcessor.h>
+
+// Framebuffer grabber includes
+#include <grabber/FramebufferWrapper.h>
+#include "FramebufferFrameGrabber.h"
+
+FramebufferWrapper::FramebufferWrapper(const std::string & device, const unsigned grabWidth, const unsigned grabHeight, const unsigned updateRate_Hz, Hyperion * hyperion) :
+	_updateInterval_ms(1000/updateRate_Hz),
+	_timeout_ms(2 * _updateInterval_ms),
+	_priority(1000),
+	_timer(),
+	_image(grabWidth, grabHeight),
+	_frameGrabber(new FramebufferFrameGrabber(device, grabWidth, grabHeight)),
+	_processor(ImageProcessorFactory::getInstance().newImageProcessor()),
+	_ledColors(hyperion->getLedCount(), ColorRgb{0,0,0}),
+	_hyperion(hyperion)
+{
+	// Configure the timer to generate events every n milliseconds
+	_timer.setInterval(_updateInterval_ms);
+	_timer.setSingleShot(false);
+
+	_processor->setSize(grabWidth, grabHeight);
+
+	// Connect the QTimer to this
+	QObject::connect(&_timer, SIGNAL(timeout()), this, SLOT(action()));
+}
+
+FramebufferWrapper::~FramebufferWrapper()
+{
+	// Cleanup used resources (ImageProcessor and FrameGrabber)
+	delete _processor;
+	delete _frameGrabber;
+}
+
+void FramebufferWrapper::start()
+{
+	// Start the timer with the pre configured interval
+	_timer.start();
+}
+
+void FramebufferWrapper::action()
+{
+	// Grab frame into the allocated image
+	_frameGrabber->grabFrame(_image);
+
+	_processor->process(_image, _ledColors);
+
+	_hyperion->setColors(_priority, _ledColors, _timeout_ms);
+}
+void FramebufferWrapper::stop()
+{
+	// Stop the timer, effectivly stopping the process
+	_timer.stop();
+}
+
+void FramebufferWrapper::setGrabbingMode(const GrabbingMode mode)
+{
+	switch (mode)
+	{
+	case GRABBINGMODE_VIDEO:
+	case GRABBINGMODE_AUDIO:
+	case GRABBINGMODE_PHOTO:
+	case GRABBINGMODE_MENU:
+	case GRABBINGMODE_INVALID:
+		start();
+		break;
+	case GRABBINGMODE_OFF:
+		stop();
+		break;
+	}
+}
+
+void FramebufferWrapper::setVideoMode(const VideoMode mode)
+{
+	_frameGrabber->setVideoMode(mode);
+}