Taskfile.dist.yml

#
# Video Clock
#
# Reimplementation of video clock from [XtendedGreg/digital-clock-with-video]:
# - https://github.com/XtendedGreg/digital-clock-with-video
# - https://youtube.com/live/aa3h_ntRh4I
#
# Tested on:
# - Raspberry Pi OS (Trixie)
# - Armbian (Trixie)
#

version: '3'

includes:
  install:
    taskfile: install
    flatten: true
    optional: true

vars:
  SETTINGS:
    map:
      VIDEO_SOURCE: '{{.VIDEO_SOURCE | default (joinPath .TASKFILE_DIR "background.mp4")}}'
      FONT_FILE: '{{.FONT_FILE | default "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf"}}'
      SMALL_FONT_SIZE: '{{.SMALL_FONT_SIZE | default 30}}'
      LARGE_FONT_SIZE: '{{.LARGE_FONT_SIZE | default 90}}'
      TEXT_COLOR: '{{.TEXT_COLOR | default "white"}}'
      TEXT_BG_COLOR: '{{.TEXT_BG_COLOR | default "black@0.5"}}' # Black with 50% opacity
      FB_DEV: '{{.FB_DEV | default "/dev/fb0"}}'
      FB_REFRESH_RATE: '{{.FB_REFRESH_RATE | default 15}}'

tasks:
  pre-scale-bg:
    internal: true
    requires:
      vars:
        - TEMP_VIDEO_FILE
        - SCREEN_W
        - SCREEN_H
        - PIXEL_FMT
    cmds:
      - >-
          ffmpeg
          -xerror
          -hide_banner
          -loglevel 'repeat+info'
          -nostdin
          -y -i {{.SETTINGS.VIDEO_SOURCE | shellQuote}}
          -filter_complex
          "scale={{.SCREEN_W}}:{{.SCREEN_H -}},
          framerate=fps={{.SETTINGS.FB_REFRESH_RATE}},
          split[v1][i];
          [i]drawtext=
          fontfile='{{.SETTINGS.FONT_FILE}}':
          fontsize={{.SETTINGS.LARGE_FONT_SIZE}}:
          fontcolor={{.SETTINGS.TEXT_COLOR}}:
          box=1:
          boxcolor={{.SETTINGS.TEXT_BG_COLOR}}:
          boxborderw=15:
          text='Loading...':
          x=(w-text_w)/2:
          y=(h-text_h)/2[v2]"
          -map '[v1]'
          -c:v libx264
          -preset ultrafast
          -tune fastdecode
          -pix_fmt yuv420p
          -profile:v main
          -crf 35
          -an
          {{.TEMP_VIDEO_FILE | shellQuote}}
          -map '[v2]'
          -pix_fmt {{.PIXEL_FMT}}
          -f fbdev {{.SETTINGS.FB_DEV}}

  show-clock:
    internal: true
    requires:
      vars:
        - TEMP_VIDEO_FILE
        - PIXEL_FMT
    cmds:
      - >-
        ffmpeg
        -xerror
        -hide_banner
        -loglevel 'repeat+info'
        -nostats
        -nostdin
        -re
        -fflags +genpts
        -stream_loop -1
        -i {{.TEMP_VIDEO_FILE}}
        -vf "drawtext=
        fontfile='{{.SETTINGS.FONT_FILE}}':
        fontsize={{.SETTINGS.SMALL_FONT_SIZE}}:
        fontcolor={{.SETTINGS.TEXT_COLOR}}:
        box=1:
        boxcolor={{.SETTINGS.TEXT_BG_COLOR}}:
        boxborderw=10:
        text='%{localtime\\:%A, %B %d, %Y %Z}':
        x=(w-text_w)/2:
        y=(h/2)-text_h-({{.SETTINGS.LARGE_FONT_SIZE}}/2)-10,
        drawtext=
        fontfile='{{.SETTINGS.FONT_FILE}}':
        fontsize={{.SETTINGS.LARGE_FONT_SIZE}}:
        fontcolor={{.SETTINGS.TEXT_COLOR}}:
        box=1:
        boxcolor={{.SETTINGS.TEXT_BG_COLOR}}:
        boxborderw=15:
        text='%{localtime\\:%X}':
        x=(w-text_w)/2:
        y=(h-text_h)/2"
        -pix_fmt {{.PIXEL_FMT}}
        -f fbdev {{.SETTINGS.FB_DEV}}

  default:
    desc: Display video clock
    summary: |-
      This task creates a video clock
      by overlaying the current time onto a motion video background.
    preconditions:
      - sh: test -c {{.SETTINGS.FB_DEV}}
        msg: Framebuffer device not found
      - sh: test -s {{.SETTINGS.VIDEO_SOURCE}}
        msg: Background video not found
    vars:
      TEMP_VIDEO_FILE:
        sh: mktemp --tmpdir bg-XXXXX.mp4
      FB_INFO_STR:
        sh: >-
          ffprobe
          -hide_banner
          -v error
          -print_format json
          -f fbdev
          -i "{{.SETTINGS.FB_DEV}}"
          -show_streams
          -select_streams v:0
      FB_INFO:
        ref: index (fromJson .FB_INFO_STR) "streams" 0
      PIXEL_FMT:
        ref: index .FB_INFO "pix_fmt" | default "bgra"
    cmds:
      - task: pre-scale-bg
        vars:
          TEMP_VIDEO_FILE: '{{.TEMP_VIDEO_FILE}}'
          SCREEN_W: '{{index .FB_INFO "width" | default 640}}'
          SCREEN_H: '{{index .FB_INFO "height" | default 480}}'
          PIXEL_FMT: '{{.PIXEL_FMT}}'
      - defer: rm {{.TEMP_VIDEO_FILE}}
      - task: show-clock
        vars:
          TEMP_VIDEO_FILE: '{{.TEMP_VIDEO_FILE}}'
          PIXEL_FMT: '{{.PIXEL_FMT}}'

  show-settings:
    desc: Display settings
    cmds:
      - for: {var: SETTINGS }
        cmd: echo {{.KEY}}={{.ITEM | shellQuote}}

  show-fb-info:
    desc: Display framebuffer data
    vars:
      FB_INFO_STR:
        sh: >-
          ffprobe
          -hide_banner
          -v error
          -print_format json
          -f fbdev
          -i "{{.SETTINGS.FB_DEV}}"
          -show_streams
          -select_streams v:0
      FB_INFO:
        ref: index (fromJson .FB_INFO_STR) "streams" 0
    cmds:
      - echo '{{.SETTINGS.FB_DEV}}:' {{index .FB_INFO "width" | default "unknown"}}x{{index .FB_INFO "height" | default "unknown"}} [{{index .FB_INFO "pix_fmt" | default "unknown"}}]