debian-laptop

pi/bin/debian-laptop-video-publisher.sh

@@ -0,0 +1,131 @@
+#!/usr/bin/env bash
+set -euo pipefail
+set +H
+
+ENV_FILE="${ROVERD_MEDIA_ENV_FILE:-/var/lib/roverd/media.env}"
+
+if [[ ! -f "$ENV_FILE" ]]; then
+	echo "Environment file ${ENV_FILE} missing; cannot publish laptop video" >&2
+	exit 1
+fi
+
+# Load roverd's generated media.env as data instead of sourcing it as shell.
+# The SRT publish URL contains normal query-string characters like '&' and '#!',
+# so evaluating the file would be both fragile and unnecessary.
+load_env_file() {
+	local content=""
+
+	if [[ -r "$ENV_FILE" ]]; then
+		content="$(cat "$ENV_FILE")"
+	elif command -v sudo >/dev/null 2>&1; then
+		content="$(sudo -n cat "$ENV_FILE" 2>/dev/null || true)"
+	fi
+
+	if [[ -z "$content" ]]; then
+		echo "Cannot read ${ENV_FILE} (permission denied). Run as a user that can read it, or allow sudo -n for cat." >&2
+		exit 1
+	fi
+
+	local line key val
+	while IFS= read -r line || [[ -n "$line" ]]; do
+		[[ "$line" =~ ^[[:space:]]*$ ]] && continue
+		[[ "$line" =~ ^[[:space:]]*# ]] && continue
+
+		if [[ "$line" =~ ^[[:space:]]*export[[:space:]]+([A-Za-z_][A-Za-z0-9_]*)=(.*)$ ]]; then
+			key="${BASH_REMATCH[1]}"
+			val="${BASH_REMATCH[2]}"
+		elif [[ "$line" =~ ^[[:space:]]*([A-Za-z_][A-Za-z0-9_]*)=(.*)$ ]]; then
+			key="${BASH_REMATCH[1]}"
+			val="${BASH_REMATCH[2]}"
+		else
+			continue
+		fi
+
+		val="${val#${val%%[![:space:]]*}}"
+		val="${val%${val##*[![:space:]]}}"
+		if [[ "$val" =~ ^\".*\"$ ]]; then
+			val="${val:1:${#val}-2}"
+		elif [[ "$val" =~ ^\'.*\'$ ]]; then
+			val="${val:1:${#val}-2}"
+		fi
+
+		printf -v "$key" '%s' "$val"
+		export "$key"
+	done <<< "$content"
+}
+
+load_env_file
+: "${ROVERD_VIDEO_ENABLE:?ROVERD_VIDEO_ENABLE not set in ${ENV_FILE}}"
+: "${ROVERD_VIDEO_PUBLISH_URL:?ROVERD_VIDEO_PUBLISH_URL not set in ${ENV_FILE}}"
+: "${ROVERD_VIDEO_DEVICE:?ROVERD_VIDEO_DEVICE not set in ${ENV_FILE}}"
+: "${ROVERD_VIDEO_WIDTH:?ROVERD_VIDEO_WIDTH not set in ${ENV_FILE}}"
+: "${ROVERD_VIDEO_HEIGHT:?ROVERD_VIDEO_HEIGHT not set in ${ENV_FILE}}"
+: "${ROVERD_VIDEO_FPS:?ROVERD_VIDEO_FPS not set in ${ENV_FILE}}"
+: "${ROVERD_VIDEO_BITRATE:?ROVERD_VIDEO_BITRATE not set in ${ENV_FILE}}"
+: "${ROVERD_VIDEO_INVERT:?ROVERD_VIDEO_INVERT not set in ${ENV_FILE}}"
+
+if [[ "${ROVERD_VIDEO_ENABLE}" -ne 1 ]]; then
+	echo "Laptop video publisher disabled by roverd media config; skipping" >&2
+	exit 0
+fi
+
+if [[ -z "${ROVERD_VIDEO_DEVICE}" ]]; then
+	echo "ROVERD_VIDEO_DEVICE is required for the debian-laptop V4L2 publisher" >&2
+	exit 1
+fi
+
+if [[ -n "${FFMPEG_BIN:-}" ]]; then
+	FFMPEG_BIN_PATH="$FFMPEG_BIN"
+elif command -v ffmpeg >/dev/null 2>&1; then
+	FFMPEG_BIN_PATH="$(command -v ffmpeg)"
+else
+	echo "ffmpeg not found; install it via apt install ffmpeg." >&2
+	exit 1
+fi
+
+VIDEO_FILTER_ARGS=()
+if [[ "${ROVERD_VIDEO_INVERT}" -ne 0 ]]; then
+	# The Pi publisher uses libcamera rotation. With a generic webcam, ffmpeg's
+	# transpose pair gives the same 180-degree correction without assuming a
+	# camera-specific driver feature.
+	VIDEO_FILTER_ARGS=(-vf "transpose=2,transpose=2")
+fi
+
+run_pipeline() {
+	"${FFMPEG_BIN_PATH}" \
+		-hide_banner \
+		-loglevel warning \
+		-fflags nobuffer \
+		-flags low_delay \
+		-thread_queue_size 4096 \
+		-f v4l2 \
+		-framerate "${ROVERD_VIDEO_FPS}" \
+		-video_size "${ROVERD_VIDEO_WIDTH}x${ROVERD_VIDEO_HEIGHT}" \
+		-i "${ROVERD_VIDEO_DEVICE}" \
+		"${VIDEO_FILTER_ARGS[@]}" \
+		-an \
+		-c:v libx264 \
+		-preset veryfast \
+		-tune zerolatency \
+		-profile:v baseline \
+		-pix_fmt yuv420p \
+		-b:v "${ROVERD_VIDEO_BITRATE}" \
+		-maxrate "${ROVERD_VIDEO_BITRATE}" \
+		-bufsize "$((ROVERD_VIDEO_BITRATE / 2))" \
+		-g "${ROVERD_VIDEO_FPS}" \
+		-keyint_min "${ROVERD_VIDEO_FPS}" \
+		-sc_threshold 0 \
+		-flush_packets 1 \
+		-muxdelay 0 \
+		-muxpreload 0 \
+		-f mpegts \
+		"${ROVERD_VIDEO_PUBLISH_URL}"
+}
+
+while true; do
+	if run_pipeline; then
+		exit 0
+	fi
+	echo "Debian laptop video publisher exited, restarting in 2s..." >&2
+	sleep 2
+done