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Basic frame grab from camera; not currently working yet, but let's try on

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OS X!
This commit is contained in:
Andrzej Kapolka 2013-06-17 15:06:40 -07:00
parent 0d4efad490
commit c7ddc89803
3 changed files with 63 additions and 1 deletions
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24
interface/src/Application.cpp
View file

@ -1567,6 +1567,9 @@ void Application::update(float deltaTime) {
// Update transmitter
// Get the webcam frame
_webcam.grabFrame();
// Sample hardware, update view frustum if needed, and send avatar data to mixer/agents
updateAvatar(deltaTime);
@ -2148,6 +2151,27 @@ void Application::displayOverlay() {
drawtext(_glWidget->width() - 350, 50, 0.10, 0, 1.0, 0, paintMessage, 1, 1, 0);
}
// render the webcam input frame
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, _webcam.getFrameTextureID());
glBegin(GL_QUADS);
const int FRAME_PREVIEW_HEIGHT = 200;
int framePreviewWidth = _webcam.getFrameAspectRatio() * FRAME_PREVIEW_HEIGHT;
int bottom = _glWidget->height() - 400;
int left = _glWidget->width() - framePreviewWidth - 400;
glTexCoord2f(0, 0);
glVertex2f(left, bottom);
glTexCoord2f(1, 0);
glVertex2f(left + framePreviewWidth, bottom);
glTexCoord2f(1, 1);
glVertex2f(left + framePreviewWidth, bottom + FRAME_PREVIEW_HEIGHT);
glTexCoord2f(0, 1);
glVertex2f(left, bottom + FRAME_PREVIEW_HEIGHT);
glEnd();
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_TEXTURE_2D);
glPopMatrix();
}

25
interface/src/Webcam.cpp
View file

@ -14,7 +14,22 @@
Webcam::Webcam() {
if ((_capture = cvCaptureFromCAM(-1)) == 0) {
printLog("Failed to open webcam.\n");
return;
}
// bump up the capture property
cvSetCaptureProperty(_capture, CV_CAP_PROP_FPS, 60);
// get the dimensions of the frames
_frameWidth = cvGetCaptureProperty(_capture, CV_CAP_PROP_FRAME_WIDTH);
_frameHeight = cvGetCaptureProperty(_capture, CV_CAP_PROP_FRAME_HEIGHT);
// initialize the texture that will contain the grabbed frames
glGenTextures(1, &_frameTextureID);
glBindTexture(GL_TEXTURE_2D, _frameTextureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, _frameWidth, _frameHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
}
Webcam::~Webcam() {
@ -22,3 +37,13 @@ Webcam::~Webcam() {
cvReleaseCapture(&_capture);
}
}
void Webcam::grabFrame() {
IplImage* image = cvQueryFrame(_capture);
if (image == 0) {
return;
}
glBindTexture(GL_TEXTURE_2D, _frameTextureID);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, _frameWidth, _frameHeight, GL_RGB, GL_UNSIGNED_BYTE, image->imageData);
glBindTexture(GL_TEXTURE_2D, 0);
}

15
interface/src/Webcam.h
View file

@ -9,7 +9,9 @@
#ifndef __interface__Webcam__
#define __interface__Webcam__
class CvCapture;
#include "InterfaceConfig.h"
struct CvCapture;
class Webcam {
public:
@ -17,9 +19,20 @@ public:
Webcam();
~Webcam();
int getFrameWidth() const { return _frameWidth; }
int getFrameHeight() const { return _frameHeight; }
float getFrameAspectRatio() const { return _frameWidth / (float)_frameHeight; }
GLuint getFrameTextureID() const { return _frameTextureID; }
void grabFrame();
private:
CvCapture* _capture;
int _frameWidth;
int _frameHeight;
GLuint _frameTextureID;
};
#endif /* defined(__interface__Webcam__) */