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119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
//
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// Webcam.cpp
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// interface
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//
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// Created by Andrzej Kapolka on 6/17/13.
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// Copyright (c) 2013 High Fidelity, Inc. All rights reserved.
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#include <QtDebug>
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#include <opencv2/opencv.hpp>
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#include <Log.h>
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#include "Application.h"
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#include "Webcam.h"
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Webcam::Webcam() : _frameTextureID(0) {
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// the grabber simply runs as fast as possible
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_grabber = new FrameGrabber();
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_grabber->moveToThread(&_grabberThread);
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}
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void Webcam::init() {
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// start the grabber thread
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_grabberThread.start();
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// let the grabber know we're ready for the first frame
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QMetaObject::invokeMethod(_grabber, "grabFrame");
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}
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void Webcam::renderPreview(int screenWidth, int screenHeight) {
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if (_frameTextureID != 0) {
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glBindTexture(GL_TEXTURE_2D, _frameTextureID);
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glEnable(GL_TEXTURE_2D);
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glColor3f(1.0f, 1.0f, 1.0f);
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glBegin(GL_QUADS);
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const int PREVIEW_HEIGHT = 200;
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int previewWidth = _frameWidth * PREVIEW_HEIGHT / _frameHeight;
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int bottom = screenHeight - 400;
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int left = screenWidth - previewWidth - 400;
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glTexCoord2f(0, 0);
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glVertex2f(left, bottom);
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glTexCoord2f(1, 0);
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glVertex2f(left + previewWidth, bottom);
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glTexCoord2f(1, 1);
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glVertex2f(left + previewWidth, bottom + PREVIEW_HEIGHT);
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glTexCoord2f(0, 1);
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glVertex2f(left, bottom + PREVIEW_HEIGHT);
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glEnd();
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glBindTexture(GL_TEXTURE_2D, 0);
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glDisable(GL_TEXTURE_2D);
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}
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}
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Webcam::~Webcam() {
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// stop the grabber thread
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_grabberThread.quit();
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_grabberThread.wait();
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delete _grabber;
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}
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void Webcam::setFrame(void* image) {
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IplImage* img = static_cast<IplImage*>(image);
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GLint internalFormat;
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GLenum format;
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if (img->nChannels == 3) {
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internalFormat = GL_RGB;
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format = GL_BGR;
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} else {
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internalFormat = GL_RGBA;
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format = GL_BGRA;
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}
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if (_frameTextureID == 0) {
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glGenTextures(1, &_frameTextureID);
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glBindTexture(GL_TEXTURE_2D, _frameTextureID);
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glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, _frameWidth = img->width, _frameHeight = img->height, 0, format,
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GL_UNSIGNED_BYTE, img->imageData);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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} else {
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glBindTexture(GL_TEXTURE_2D, _frameTextureID);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, _frameWidth, _frameHeight, format, GL_UNSIGNED_BYTE, img->imageData);
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}
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glBindTexture(GL_TEXTURE_2D, 0);
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// let the grabber know we're ready for the next frame
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QMetaObject::invokeMethod(_grabber, "grabFrame");
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}
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FrameGrabber::~FrameGrabber() {
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if (_capture != 0) {
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cvReleaseCapture(&_capture);
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}
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}
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void FrameGrabber::grabFrame() {
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if (_capture == 0) {
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if ((_capture = cvCaptureFromCAM(-1)) == 0) {
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printLog("Failed to open webcam.\n");
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return;
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}
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}
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IplImage* image = cvQueryFrame(_capture);
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if (image == 0) {
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// try again later
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QMetaObject::invokeMethod(this, "grabFrame", Qt::QueuedConnection);
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return;
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}
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// make sure it's in the format we expect
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if ((image->nChannels != 3 && image->nChannels != 4) || image->depth != IPL_DEPTH_8U ||
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image->dataOrder != IPL_DATA_ORDER_PIXEL || image->origin != 0) {
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printLog("Invalid webcam image format.\n");
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return;
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}
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QMetaObject::invokeMethod(Application::getInstance()->getWebcam(), "setFrame", Q_ARG(void*, image));
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}
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