feat: Add Width and Height Parameters to ASCII Stream Output

[skrashevich]

This pull request introduces significant enhancements to the internal mjpeg package, particularly the ASCII stream functionality:

1. New Width and Height Parameters:

   • Added width and height parameters to the NewWriter function, allowing users to specify the dimensions of the ASCII output.
   • Updated the README.md to include documentation for width and height parameters, along with examples.

2. Function Modifications:

   • Modified the outputMjpeg function to extract width and height from the HTTP request and pass them to NewWriter.
   • Enhanced the NewWriter function to handle the new parameters and resize the image according to specified dimensions before processing.

3. Image Resizing:

   • Introduced a utility function resizeImage which resizes the input image based on the provided width and height, maintaining the aspect ratio if only one dimension is provided.

4. Additional Minor Refactoring:

   • Consolidated constant definitions for color codes for better readability.
   • Refactored sections of the code for improved clarity and maintainability.

By adding these parameters, users now have better control over the ASCII output size, allowing more flexibility for different display requirements.

Examples:

# Example with width and height
curl "http://192.168.1.123:1984/api/stream.ascii?src=gamazda&width=100&height=40"

# Example with color, width, and height
curl "http://192.168.1.123:1984/api/stream.ascii?src=gamazda&color=256&width=80&height=20"

[skrashevich]

Up