Code by Jake Aigner 2024

Note: CCV2 audio playback is not functioning properly atm...

Info:

Color space is converted from RGB to YUV.
This allows color data to be reduced without degrading the overall quality-
-which allows for more efficient use of the low bandwidth.

CCV1 and CCI halve the color resolution
CCV2 cuts the color down to 1/6th which allows for 30 more vertical scan-lines.

CCI uses amplitude modulation on the luminance data to deter streaking.

IMPORTANT!:

    you must create the following dirs inside of your build directory..
    "output"
    "input"
    "image_input"

Image sequence (001.png 002.png 003.png...) and audio (audio.wav) for CCV and CCV2-
-go inside the "input" dir.

Images for CCI go inside the "image_input" dir (1.png 2.png 3.png...)

Once encoded the signal will be generated as a wav file in the output dir.
This signal can then be recorded to tape.

The signals are designed to work with cassettes but should also work with reel 2 reel or anything-
-else that meets the following requirements:
    At least 14kHz frequency response (compact cassettes achieve 15kHz on a decent deck)
    2 channels (total separation)
    Low amount of wow/flutter

CCV1 vs CCV2:

CCV1 has better color and higher frame-rate.
CCV2 has better resolution and better audio.

CCV1 (compact cassette video):

Input Specs:
  PNG Image Sequence (8bit RGB)
  85 x 64 pixels (4:3)
  12 FPS
  Audio: Signed 16bit WAV, 1 or 2 channel, 48 or 44.1 kHz

Actual Specs:
  25ish X 64 (note: using a reel2reel or something with higher bandwidth may increase X resolution)
  12i Refresh
  Audio: 12.2kHz mono

CCV2 (compact cassette video v2):

Input Specs: PNG Image Sequence (8bit RGB) 120 x 90 pixels (4:3) 10 FPS Audio: Signed 16bit WAV, 1 or 2 channel, 48 or 44.1 kHz

Actual Specs: 36ish X 90 (note: using a reel2reel or something with higher bandwidth may increase X resolution) 10i Refresh Audio: 13.6kHz mono

CCI (compact cassette image):

Input Specs:
    750w x 500h
    8bit RGB
    PNG(s)

Actual Specs:
    100ish x 500 (note: higher bandwidth won't increase quality much since it-
        -is limited by signal modulation)

Player Info:

'ESC' to quit 'i' key to toggle signal inversion 'c' key to swap input channels 'e' key to swap byte endian 'r' to refresh screen

Arrows adjust chan 1 and 2 level

Modes:

  '1' = CCV1
  '2' = CCV2
  '3' = CCI