实现将YUV 格式数据转换成 RGBA 格式数据的Native层代码

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实现将YUV 格式数据转换成 RGBA 格式数据的Native层代码

// Just show the plain camera image without modifying it.
JNIEXPORT void JNICALL Java_com_Cartoonifier_CartoonifierView_ShowPreview(JNIEnv* env, jobject,jint width, jint height, jbyteArray yuv, jintArray bgra)
{// Get native access to the given Java arrays.jbyte* _yuv  = env->GetByteArrayElements(yuv, 0);jint*  _bgra = env->GetIntArrayElements(bgra, 0);// Prepare a cv::Mat that points to the YUV420sp data.Mat myuv(height + height/2, width, CV_8UC1, (uchar *)_yuv);// Prepare a cv::Mat that points to the BGRA output data.Mat mbgra(height, width, CV_8UC4, (uchar *)_bgra);// Convert the color format from the camera's// NV21 "YUV420sp" format to an Android BGRA color image.cvtColor(myuv, mbgra, CV_YUV420sp2BGRA);// OpenCV can now access/modify the BGRA image if we want ...// Release the native lock we placed on the Java arrays.env->ReleaseIntArrayElements(bgra, _bgra, 0);env->ReleaseByteArrayElements(yuv, _yuv, 0);
}

原文网址：

https://segmentfault.com/a/1190000000738231

Differences between OpenCV JavaCV and OpenCV4Android

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