hyperion.ng/libsrc/grabber/dispmanx/DispmanxFrameGrabber.cpp

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// STL includes
#include <cassert>
#include <iostream>
// Local includes
#include "grabber/DispmanxFrameGrabber.h"
DispmanxFrameGrabber::DispmanxFrameGrabber(const unsigned width, const unsigned height)
: Grabber("DISPMANXGRABBER", width, height)
, _vc_display(0)
, _vc_resource(0)
, _vc_flags(0)
, _captureBuffer(new ColorRgba[0])
, _captureBufferSize(0)
, _image_rgba(width, height)
{
_useImageResampler = false;
// Initiase BCM
bcm_host_init();
{
// Check if the display can be opened and display the current resolution
// Open the connection to the display
_vc_display = vc_dispmanx_display_open(0);
assert(_vc_display > 0);
// Obtain the display information
DISPMANX_MODEINFO_T vc_info;
int result = vc_dispmanx_display_get_info(_vc_display, &vc_info);
// Keep compiler happy in 'release' mode
(void)result;
assert(result == 0);
Info(_log, "Display opened with resolution: %dx%d", vc_info.width, vc_info.height);
// Close the displaye
vc_dispmanx_display_close(_vc_display);
}
// Create the resources for capturing image
uint32_t vc_nativeImageHandle;
_vc_resource = vc_dispmanx_resource_create(
VC_IMAGE_RGBA32,
width,
height,
&vc_nativeImageHandle);
assert(_vc_resource);
// Define the capture rectangle with the same size
vc_dispmanx_rect_set(&_rectangle, 0, 0, width, height);
}
DispmanxFrameGrabber::~DispmanxFrameGrabber()
{
delete[] _captureBuffer;
// Clean up resources
vc_dispmanx_resource_delete(_vc_resource);
// De-init BCM
bcm_host_deinit();
}
void DispmanxFrameGrabber::setFlags(const int vc_flags)
{
_vc_flags = vc_flags;
}
int DispmanxFrameGrabber::grabFrame(Image<ColorRgb> & image)
{
if (!_enabled) return 0;
int ret;
// vc_dispmanx_resource_read_data doesn't seem to work well
// with arbitrary positions so we have to handle cropping by ourselves
unsigned cropLeft = _cropLeft;
unsigned cropRight = _cropRight;
unsigned cropTop = _cropTop;
unsigned cropBottom = _cropBottom;
if (_vc_flags & DISPMANX_SNAPSHOT_FILL)
{
// disable cropping, we are capturing the video overlay window
cropLeft = cropRight = cropTop = cropBottom = 0;
}
unsigned imageWidth = _width - cropLeft - cropRight;
unsigned imageHeight = _height - cropTop - cropBottom;
// calculate final image dimensions and adjust top/left cropping in 3D modes
switch (_videoMode)
{
case VIDEO_3DSBS:
imageWidth /= 2;
cropLeft /= 2;
break;
case VIDEO_3DTAB:
imageHeight /= 2;
cropTop /= 2;
break;
case VIDEO_2D:
default:
break;
}
// resize the given image if needed
if (image.width() != imageWidth || image.height() != imageHeight)
{
image.resize(imageWidth, imageHeight);
}
if (_image_rgba.width() != imageWidth || _image_rgba.height() != imageHeight)
{
_image_rgba.resize(imageWidth, imageHeight);
}
// Open the connection to the display
_vc_display = vc_dispmanx_display_open(0);
if (_vc_display < 0)
{
Error(_log, "Cannot open display: %d", _vc_display);
return -1;
}
// Create the snapshot (incl down-scaling)
ret = vc_dispmanx_snapshot(_vc_display, _vc_resource, (DISPMANX_TRANSFORM_T) _vc_flags);
if (ret < 0)
{
Error(_log, "Snapshot failed: %d", ret);
vc_dispmanx_display_close(_vc_display);
return ret;
}
// Read the snapshot into the memory
void* imagePtr = _image_rgba.memptr();
void* capturePtr = imagePtr;
unsigned imagePitch = imageWidth * sizeof(ColorRgba);
// dispmanx seems to require the pitch to be a multiple of 64
unsigned capturePitch = (_rectangle.width * sizeof(ColorRgba) + 63) & (~63);
// grab to temp buffer if image pitch isn't valid or if we are cropping
if (imagePitch != capturePitch
|| (unsigned)_rectangle.width != imageWidth
|| (unsigned)_rectangle.height != imageHeight)
{
// check if we need to resize the capture buffer
unsigned captureSize = capturePitch * _rectangle.height / sizeof(ColorRgba);
if (_captureBufferSize != captureSize)
{
delete[] _captureBuffer;
_captureBuffer = new ColorRgba[captureSize];
_captureBufferSize = captureSize;
}
capturePtr = &_captureBuffer[0];
}
ret = vc_dispmanx_resource_read_data(_vc_resource, &_rectangle, capturePtr, capturePitch);
if (ret < 0)
{
Error(_log, "vc_dispmanx_resource_read_data failed: %d", ret);
vc_dispmanx_display_close(_vc_display);
return ret;
}
// copy capture data to image if we captured to temp buffer
if (imagePtr != capturePtr)
{
// adjust source pointer to top/left cropping
uint8_t* src_ptr = (uint8_t*) capturePtr
+ cropLeft * sizeof(ColorRgba)
+ cropTop * capturePitch;
for (unsigned y = 0; y < imageHeight; y++)
{
memcpy((uint8_t*)imagePtr + y * imagePitch,
src_ptr + y * capturePitch,
imagePitch);
}
}
// Close the displaye
vc_dispmanx_display_close(_vc_display);
// image to output image
_image_rgba.toRgb(image);
return 0;
}