Problems when scaling a YUV image using libyuv library

Question

I\'m developing a camera app based on Camera API 2 and I have found several problems using the libyuv. I want to convert YUV_420_888 images retriev

Answer 1

gmetax is almost correct.

You are using the size of the entire array where you should be using the size of the Y component, which is src_width * src_height.

gmetax's answer is wrong in that he has put y_size in place of out_size when defining the output frame. The correct code snippet, I believe, would look like:

//Get input and output length
int input_size = env->GetArrayLength(yuvByteArray_);
int y_size = src_width * src_height;
int out_size = out_height * out_width;

//Generate input frame
i420_input_frame.width = src_width;
i420_input_frame.height = src_height;
i420_input_frame.data = (uint8_t *) yuvByteArray;
i420_input_frame.y = i420_input_frame.data;
i420_input_frame.u = i420_input_frame.y + y_size;
i420_input_frame.v = i420_input_frame.u + y_size / 4;

//Generate output frame
free(i420_output_frame.data);
i420_output_frame.width = out_width;
i420_output_frame.height = out_height;
i420_output_frame.data = new unsigned char[out_size * 3 / 2];
i420_output_frame.y = i420_output_frame.data;
i420_output_frame.u = i420_output_frame.y + out_size;
i420_output_frame.v = i420_output_frame.u + out_size / 4;