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android-webcam: add configurable ASCII scale
- --ascii now accepts optional SIZE parameter (1-20, default 6)
- shader generated from template with scale value
- fixed exclusive_caps for raw camera device
author
lassulus
date
(Jan 17, 2026, 11:44 PM CET)
commit
9c86ec60
9c86ec606246c2fa824d83cf11934fa0d935609b
parent
947ccfb0
947ccfb0db8520a4ecea14770699da6fb5be725b
+18
-5
+1
-1
2configs/android-webcam.nix
+1
-1
2configs/android-webcam.nix
···
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kernelModules = [ "v4l2loopback" ];
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extraModulePackages = [ config.boot.kernelPackages.v4l2loopback ];
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extraModprobeConfig = ''
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-
options v4l2loopback devices=2 video_nr=0,1 exclusive_caps=1,1 card_label="Phone Camera","ASCII Webcam"
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options v4l2loopback devices=2 video_nr=0,1 exclusive_caps=0,1 card_label="Phone Camera","ASCII Webcam"
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'';
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};
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+15
-3
tools/android-webcam/android-webcam.sh
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-3
tools/android-webcam/android-webcam.sh
···
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SHADER_PATH="@shaderPath@"
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SHADER_TEMPLATE="@shaderPath@"
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ASCII_MODE=false
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ASCII_SCALE=6
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while [[ $# -gt 0 ]]; do
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case $1 in
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--ascii)
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ASCII_MODE=true
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shift
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# Check if next arg is a number (the scale)
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if [[ $# -gt 0 && $1 =~ ^[0-9]+$ ]]; then
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ASCII_SCALE=$1
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shift
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fi
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;;
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*)
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echo "Unknown option: $1" >&2
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echo "Usage: android-webcam [--ascii]" >&2
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echo "Usage: android-webcam [--ascii [SIZE]]" >&2
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echo " SIZE: character size 1-20 (default: 6)" >&2
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exit 1
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;;
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esac
···
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echo "v4l2loopback should be configured with devices=2" >&2
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exit 1
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fi
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# Generate shader with scale value
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SHADER_PATH=$(mktemp --suffix=.hook)
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sed "s/@SCALE@/${ASCII_SCALE}/" "${SHADER_TEMPLATE}" > "${SHADER_PATH}"
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else
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if [[ ! -e /dev/video0 ]]; then
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echo "Error: /dev/video0 must exist" >&2
···
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echo "Stopping..."
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kill "${SCRCPY_PID}" 2>/dev/null || true
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[[ -n "${FFMPEG_PID:-}" ]] && kill "${FFMPEG_PID}" 2>/dev/null || true
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[[ -n "${SHADER_PATH:-}" && -f "${SHADER_PATH}" ]] && rm -f "${SHADER_PATH}"
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}
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trap cleanup EXIT
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···
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sleep 2
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# Start ffmpeg with ASCII shader to /dev/video1
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echo "Starting ASCII filter pipeline..."
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echo "Starting ASCII filter pipeline (scale=${ASCII_SCALE})..."
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ffmpeg \
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-f v4l2 -i /dev/video0 \
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-vf "libplacebo=custom_shader_path=${SHADER_PATH}" \
···
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echo "Android ASCII webcam running!"
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echo " Raw camera: /dev/video0 (Phone Camera)"
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echo " ASCII output: /dev/video1 (ASCII Webcam)"
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echo " Character size: ${ASCII_SCALE}"
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else
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echo ""
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echo "Android webcam running!"
+1
-1
tools/android-webcam/ascii.hook
+1
-1
tools/android-webcam/ascii.hook