49 lines
2.0 KiB
Bash
Executable File
49 lines
2.0 KiB
Bash
Executable File
#!/bin/sh
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# Points mpv at a capture-card video device. Installed to /usr/local/bin/capture-view.
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# Called by thinclient-agent (capture_control.py / main.py) when a capture source is
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# selected — the thin client's "receiver box" input switching, see
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# hosts/thin-client/README.md's "Capture-card / receiver-box viewing" section.
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#
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# Kill-and-relaunch, same shape as digest-browser/admin-browser: mpv has no live
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# "change input" command worth scripting around, and there is no state to preserve
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# across a source switch.
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#
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# --title=thinclient-capture-view is what makes this safe to relaunch: mpv is ALSO
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# used for local media playback and the idle-gallery slideshow on this machine, and a
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# bare `pkill -f mpv` here would kill those too. Scoping pkill/pgrep to this exact
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# title — never anything broader — is the same fix already applied to
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# digest-browser's/admin-browser's own pkill patterns (see the comment there); this
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# script starts from that fix rather than needing it retrofitted later.
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set -eu
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DEVICE="${1:?capture-view: no device path given}"
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AUDIO_CARD="${2:-}"
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pkill -u "$(id -u)" -f "mpv .*--title=thinclient-capture-view" 2>/dev/null || true
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# Wait for the old process to release the device node before relaunching.
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i=0
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while pgrep -u "$(id -u)" -f "mpv .*--title=thinclient-capture-view" >/dev/null 2>&1 && [ "$i" -lt 20 ]; do
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sleep 0.25
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i=$((i + 1))
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done
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# --untimed/--no-cache: this is a live source, not a file — play frames as they
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# arrive rather than pacing/buffering the way mpv would for on-disk media.
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set -- mpv \
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"av://v4l2:${DEVICE}" \
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--title=thinclient-capture-view \
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--profile=low-latency \
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--untimed \
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--no-cache
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# Best-effort: many USB HDMI-capture dongles carry their embedded HDMI audio over a
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# *separate* USB Audio Class interface rather than in the V4L2 stream itself — see
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# capture_control.find_audio_card()'s docstring for how (and how confidently) this
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# gets matched. Video-only playback (no crash) if none was found.
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if [ -n "$AUDIO_CARD" ]; then
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set -- "$@" "--external-file=alsa://${AUDIO_CARD}"
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fi
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exec "$@"
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