79 lines
2.6 KiB
Bash
79 lines
2.6 KiB
Bash
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#!/bin/sh
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#
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# mediapi X session -- the X client launched by xinit from mediapi-mpv.service.
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#
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# Mirrors every extra HDMI output onto the first, then runs ONE fullscreen mpv.
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#
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# Why an X server at all (we used to run mpv straight on DRM/KMS for fast boot):
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# DRM "master" is exclusive per card. The Pi 4's two HDMI connectors live on a
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# single vc4 card, so two independent mpv processes cannot both modeset -- the
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# second gets "Failed to acquire DRM master: Permission denied" and shows
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# nothing. A single X server is the one DRM master and drives BOTH connectors;
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# `xrandr --same-as` clones the first output's framebuffer onto the others, so
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# one mpv appears on every screen. See git history for the full diagnosis.
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#
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set -u
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RUNTIME_DIR="${MEDIAPI_RUNTIME_DIR:-/run/mediapi}"
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SOCKET="${MEDIAPI_MPV_SOCKET:-$RUNTIME_DIR/mpv.sock}"
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# Always-on car display: never blank or DPMS-off.
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xset -dpms 2>/dev/null || true
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xset s off 2>/dev/null || true
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connected() { xrandr --query 2>/dev/null | awk '/ connected/{print $1}'; }
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# Cold-boot race: the second HDMI connector may not be probed as "connected"
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# when X starts. Wait for connected outputs to appear, then let the set settle
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# so a screen that lights up a beat later is still mirrored (bounded so a
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# genuinely single-screen setup doesn't hang the boot).
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deadline=$(( $(date +%s) + 30 ))
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outs="$(connected)"
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while [ -z "$outs" ] && [ "$(date +%s)" -lt "$deadline" ]; do
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sleep 1
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outs="$(connected)"
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done
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stable=0
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settle_end=$(( $(date +%s) + 8 ))
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while [ "$(date +%s)" -lt "$settle_end" ]; do
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sleep 1
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cur="$(connected)"
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if [ "$cur" != "$outs" ]; then
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outs="$cur"
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stable=0
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else
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stable=$(( stable + 1 ))
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[ "$stable" -ge 2 ] && break
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fi
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done
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primary=""
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rest=""
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for o in $outs; do
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if [ -z "$primary" ]; then primary="$o"; else rest="$rest $o"; fi
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done
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echo "mediapi-session: connected outputs:$outs (primary=${primary:-none})"
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for o in $rest; do
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echo "mediapi-session: mirroring $o onto $primary"
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xrandr --output "$o" --same-as "$primary" || true
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done
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# Single mpv, on X (so one DRM master drives every mirrored connector). Carries
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# audio and the app's IPC socket; the app talks only to this one socket now.
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# hwdec=v4l2m2m-copy uses the Pi's hardware H.264/HEVC decoder (falls back to
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# software for codecs it can't handle). Roughly a third of the CPU of software
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# decoding 1080p -- important for an always-on player in a warm car. The single
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# mpv has the HW decoder to itself now, so there's no contention.
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exec mpv \
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--idle=yes \
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--vo=gpu-next \
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--gpu-context=x11egl \
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--hwdec=v4l2m2m-copy \
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--fullscreen \
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--no-terminal \
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--keep-open=no \
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--input-ipc-server="$SOCKET" \
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--ao=alsa
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