adding cmake based android scripts and a reusable android library - samples to follow - haven't tested yet completely

android/android-jni/jni/image_pool.cpp

@@ -0,0 +1,86 @@
+#include "image_pool.h"
+
+#include "yuv420sp2rgb.h"
+
+#include <android/log.h>
+#include <opencv2/imgproc/imgproc.hpp>
+
+
+JNIEXPORT void JNICALL Java_com_opencv_jni_opencvJNI_addYUVtoPool(JNIEnv * env,
+		jclass thiz, jlong ppool, jobject _jpool, jbyteArray jbuffer,
+		jint jidx, jint jwidth, jint jheight, jboolean jgrey) {
+	image_pool *pool = (image_pool *) ppool;
+
+	Ptr<Mat> mat = pool->getYUV(jidx);
+
+	if (mat.empty() || mat->cols != jwidth || mat->rows != jheight * 2) {
+		//pool->deleteGrey(jidx);
+		mat = new Mat(jheight * 2, jwidth, CV_8UC1);
+	}
+
+	jsize sz = env->GetArrayLength(jbuffer);
+	uchar* buff = mat->ptr<uchar> (0);
+
+	env->GetByteArrayRegion(jbuffer, 0, sz, (jbyte*) buff);
+
+	pool->addYUVMat(jidx, mat);
+	Ptr<Mat> color = pool->getImage(jidx);
+	if (color.empty() || color->cols != jwidth || color->rows != jheight) {
+		//pool->deleteImage(jidx);
+		color = new Mat(jheight, jwidth, CV_8UC3);
+	}
+	if (!jgrey) {
+
+		//doesn't work unfortunately..
+		//cvtColor(*mat,*color, CV_YCrCb2RGB);
+		color_convert_common(buff, buff + jwidth * jheight, jwidth, jheight,
+				color->ptr<uchar> (0), false);
+
+	}
+
+	if (jgrey) {
+		Mat grey;
+		pool->getGrey(jidx, grey);
+
+		cvtColor(grey, *color, CV_GRAY2RGB);
+
+	}
+
+	pool->addImage(jidx, color);
+
+}
+
+image_pool::image_pool() {
+
+}
+
+image_pool::~image_pool() {
+	__android_log_print(ANDROID_LOG_INFO, "image_pool", "destructor called");
+}
+
+cv::Ptr<Mat> image_pool::getImage(int i) {
+	return imagesmap[i];
+}
+void image_pool::getGrey(int i, Mat & grey) {
+
+	cv::Ptr<Mat> tm = yuvImagesMap[i];
+	if (tm.empty())
+		return;
+	grey = (*tm)(Range(0, tm->rows / 2), Range::all());
+}
+cv::Ptr<Mat> image_pool::getYUV(int i) {
+
+	return yuvImagesMap[i];
+
+}
+void image_pool::addYUVMat(int i, cv::Ptr<Mat> mat) {
+
+	yuvImagesMap[i] = mat;
+
+}
+void image_pool::addImage(int i, cv::Ptr<Mat> mat) {
+
+	imagesmap[i] = mat;
+
+}
+