CODEWITHSUNDEEP
cubuntuwebcam-capture
Ahmed Mkadem
Ahmed Mkadem

Reputation: 63

C program for Webcam capture

I'm writing a simple C code for taking capture from my webcam and save it as a jpeg file on Ubuntu. Here is the code used :

 #include <stdio.h>
 #include <stdlib.h>
 #define SIZE 76800 // number of pixels (320x240 for my webcam)
 int main() {
    FILE *camera, *grab;
    camera=fopen("/dev/video0", "rb");
    grab=fopen("grab.jpeg", "wb");
    float data[SIZE];
    fread(data, sizeof(data[0]), SIZE, camera);
    fwrite(data, sizeof(data[0]), SIZE, grab);
    fclose(camera);
    fclose(grab); 
    return 0;
 }

The resulting file is not a jpeg, how can I modify my code to obtain jpeg or png file at the end ?

Upvotes: 2

Views: 9236

Answers (1)

Gonzalo Aguilar Delgado
Gonzalo Aguilar Delgado

Reputation: 663

This won't work. Because camera is a complex device and you have to set resolution, color scheme and some other important data to start capture.

You should use something like libuvc.

https://ken.tossell.net/libuvc/doc/group__device.html

You can check here. In line 614 they are trying to find a device and use it for camera grabbing. I think it's a great example.

https://github.com/gadLinux/OpenHMD-RiftPlayground/blob/master/src/main.c

Basically you have to init context, find camera, and use it.

Upvotes: 5

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