Picking up YUV from video buffer

[manuboy]

i am struggling to come up with a c program that is capable of picking up the Y, U and V parameters from a video stream and compare them with that of another stream to calculate the PSNR.

i was able to download existing programs from the net but unfortunately that are all part of a library, thus cannot operate on its own.

if i have the program below, how do i develop it to compile, for the purpose of calculating PSNR

At this stage i still find it difficult developing c programs to compile.

Any help will be welcomed
Kind regards

#include <stdio.h>
#include <math.h>



{
double FindPsnr (unsigned char *input1, unsigned char * input2, int count)
{
int c;
float sum = 0;
int square=0;

for (c=0 ;c<count; ++c)
{
square = *input1++ - *input2++;
square = square * square;
sum += square;
}
//sum = 65025.0*count/sum;
//if(sum>=0.000001)//not zero.
if(sum==0) sum=count; /* - make sure no infinity value */
sum = 10.0*log10(65025.0*count/sum);
//else sum = 0;
return sum;
//return 0;
}

int main(void)
{
int Area=0
int Width = 0
int Height = 0
Area = Width * Height; //image width , height;
// Area for Y = Width*Height, Area for U or V = Width*Height >>2;

psnr_y = FindPsnr ((unsigned char *) input_frame_buffer,
(unsigned char *)recon_frame_buffer, Area);

psnr_u = FindPsnr ((unsigned char *) input_frame_buffer+Area,
(unsigned char *)recon_frame_buffer+Area, Area>>2);

psnr_v = FindPsnr ((unsigned char *) input_frame_buffer+Area+(Area>>2),
(unsigned char *)recon_frame_buffer+Area+(Area>>2), Area>>
}

}

[oler1s]

What's wrong with the code you find online being in the form of a library? Certainly, you can learn from the code, and adapt it to to your own program. I mean, were you expecting a full blown program that conforms precisely to your specifications?

The code necessary is going to be more than 10 lines of uncompilable code. You have to go significantly further to achieve your task. Things like reading and decoding the video will be necessary.

From what we can tell, you don't really have a specific question. Instead, it's more along the lines of "I don't know what i'm doing". If this is above your level of programming knowledge, then there isn't much we can do.

[manuboy]

Thanks for your prompt reply. Even though i have tried to remodel the programs i downloaded, i still think like you rightly said the problem is with my programming level. Knowing i can always get help for this forum, i will take your response like a challenge to improve my programing skills and i am certain you will be availble to help if i get specific in the course of sorting it out
thanks