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+#!/bin/bash
+# run_perf_binding_cell.sh — iter8 perf binding cell.
+#
+# Anchors campaign-wide claims with measured numbers. Runs four consumer
+# configurations for $DURATION seconds each on $FIXTURE and emits a
+# markdown table comparing:
+#   1. mpv --hwdec=vaapi          (DMA-BUF zero-copy through libva)
+#   2. mpv --hwdec=vaapi-copy     (HW decode + VAImage readback)
+#   3. firefox (iter5-amend, sandbox enabled, file:// URL)
+#   4. mpv --hwdec=no             (SW decode baseline / control)
+#
+# For each consumer: CPU% (median + p90), GPU freq (median MHz), drops in
+# measurement window, p50 frame interval (ms), VmRSS delta (MiB).
+#
+# Usage:
+#   ./run_perf_binding_cell.sh [fixture_path]
+#
+# If no argument, defaults to /home/mfritsche/fourier-test/bbb_1080p30_h264.mp4
+# Override DURATION via env: DURATION=60 ./run_perf_binding_cell.sh
+#
+# Reproducibility: results depend on (a) the iter7-end driver being installed
+# at /usr/lib/dri/v4l2_request_drv_video.so, (b) ohm idle (no other compute
+# load), (c) fixture present at the expected path. Run on a stable thermal
+# state (after a few minutes of cool-down).
+
+set -eu
+
+FIXTURE="${1:-/home/mfritsche/fourier-test/bbb_1080p30_h264.mp4}"
+DURATION="${DURATION:-30}"
+WORKDIR="${WORKDIR:-$(mktemp -d -t perf_binding.XXXXXX)}"
+GPU_DEVFREQ_PATH="${GPU_DEVFREQ_PATH:-/sys/class/devfreq/fde60000.gpu/cur_freq}"
+
+# DISPLAY/Wayland env for the operator's session, needed for Firefox under sudo.
+export XDG_RUNTIME_DIR="${XDG_RUNTIME_DIR:-/run/user/1001}"
+export WAYLAND_DISPLAY="${WAYLAND_DISPLAY:-wayland-0}"
+export DISPLAY="${DISPLAY:-:0}"
+export XAUTHORITY="${XAUTHORITY:-/run/user/1001/xauth_pxiMur}"
+
+# libva env vars for the v4l2_request driver path.
+export LIBVA_DRIVER_NAME=v4l2_request
+export LIBVA_V4L2_REQUEST_VIDEO_PATH=/dev/video1
+export LIBVA_V4L2_REQUEST_MEDIA_PATH=/dev/media0
+
+if [[ ! -f "$FIXTURE" ]]; then
+	echo "FAIL: fixture not found: $FIXTURE" >&2
+	exit 2
+fi
+
+mkdir -p "$WORKDIR"
+echo "Fixture:   $FIXTURE ($(stat -c %s "$FIXTURE") bytes)"
+echo "Duration:  ${DURATION}s per configuration"
+echo "Workdir:   $WORKDIR"
+echo "GPU freq:  $GPU_DEVFREQ_PATH"
+echo "Driver sha: $(sha256sum /usr/lib/dri/v4l2_request_drv_video.so | cut -d' ' -f1)"
+echo
+
+# percentile_from_stream sorted_file pct -> echo Nth percentile value
+# Argument: a file with one numeric value per line (no header), and a percentile
+# integer (50, 90, etc.). Numbers can be float; uses awk.
+percentile_from_stream() {
+	local file="$1" pct="$2"
+	awk -v pct="$pct" '
+	{ a[NR] = $1 }
+	END {
+		if (NR == 0) { print "0"; exit }
+		# sort
+		for (i = 1; i <= NR; i++) for (j = i+1; j <= NR; j++) if (a[i] > a[j]) { t = a[i]; a[i] = a[j]; a[j] = t }
+		idx = int((pct/100.0) * NR + 0.5)
+		if (idx < 1) idx = 1
+		if (idx > NR) idx = NR
+		print a[idx]
+	}' "$file"
+}
+
+# Background-poll GPU freq while the consumer runs. Writes Hz values to $1.
+poll_gpu_freq() {
+	local out="$1"
+	: >"$out"
+	while [[ -e "/proc/$BG_PARENT_PID" ]]; do
+		if [[ -r "$GPU_DEVFREQ_PATH" ]]; then
+			cat "$GPU_DEVFREQ_PATH" 2>/dev/null >>"$out" || true
+		fi
+		sleep 0.1
+	done
+}
+
+# Run a single consumer configuration. Args:
+#   $1 label (used for filename, no spaces)
+#   $2 launcher cmd (will be exec'd as mfritsche; should be a single line)
+#   $3 'mpv' or 'firefox' — affects how we find the PID to track
+run_consumer() {
+	local label="$1"
+	local launcher="$2"
+	local kind="$3"
+	local logdir="$WORKDIR/$label"
+	mkdir -p "$logdir"
+
+	echo "=== Running: $label ==="
+
+	# Kill any running firefox/mpv first to clean state.
+	pkill -f firefox 2>/dev/null || true
+	pkill -x mpv     2>/dev/null || true
+	sleep 1
+
+	# VmRSS at start (we'll read again at end) — captured per-PID after launch.
+	# Launch consumer in background, capture stdout+stderr to a log.
+	(
+		eval "$launcher" >"$logdir/consumer.log" 2>&1
+	) &
+	local launcher_pid=$!
+
+	# Wait briefly for the process tree to spawn the actual decode worker.
+	sleep 4
+
+	local target_pid
+	case "$kind" in
+		mpv)
+			target_pid=$(pgrep -x mpv | head -1)
+			;;
+		firefox)
+			# Firefox's RDD process holds /dev/video1; that's the one with
+			# the libva decoder context. Wait an extra few seconds for it
+			# to spawn and bind the device.
+			sleep 6
+			target_pid=$(pgrep -af 'contentproc.*\brdd\b' | awk '{print $1}' | head -1)
+			if [[ -z "${target_pid:-}" ]]; then
+				# Fallback: find whichever firefox process holds /dev/video1.
+				target_pid=$(sudo lsof -t /dev/video1 2>/dev/null | head -1 || true)
+			fi
+			;;
+		*)
+			echo "  bad kind: $kind" >&2
+			return 1
+			;;
+	esac
+
+	if [[ -z "${target_pid:-}" ]]; then
+		echo "  WARN: could not locate $kind process; skipping pidstat" >&2
+		# Let the consumer run for the duration anyway so the log gets data.
+		sleep "$DURATION"
+		kill -TERM "$launcher_pid" 2>/dev/null || true
+		pkill -f firefox 2>/dev/null || true
+		pkill -x mpv     2>/dev/null || true
+		return 0
+	fi
+
+	echo "  Tracking PID $target_pid"
+
+	# VmRSS at start.
+	local rss_start
+	rss_start=$(awk '/^VmRSS:/{print $2}' "/proc/$target_pid/status" 2>/dev/null || echo 0)
+	echo "  VmRSS start: ${rss_start} kB"
+
+	# Poll GPU freq in background (keyed off launcher_pid).
+	BG_PARENT_PID=$launcher_pid
+	poll_gpu_freq "$logdir/gpu_freq.log" &
+	local poll_pid=$!
+
+	# Run pidstat for $DURATION seconds.
+	pidstat -u -p "$target_pid" 1 "$DURATION" >"$logdir/pidstat.log" 2>&1 || true
+
+	# VmRSS at end (before killing).
+	local rss_end
+	rss_end=$(awk '/^VmRSS:/{print $2}' "/proc/$target_pid/status" 2>/dev/null || echo "$rss_start")
+
+	# Stop everything.
+	kill "$poll_pid" 2>/dev/null || true
+	kill -TERM "$launcher_pid" 2>/dev/null || true
+	pkill -f firefox 2>/dev/null || true
+	pkill -x mpv     2>/dev/null || true
+	sleep 1
+
+	# Parse pidstat by header: locate the %CPU column index from the
+	# column-name row, then apply it to data rows. Robust across
+	# sysstat 12.x point releases (where column positions shift).
+	awk '
+		# Header row: find which field is %CPU.
+		$1 == "#" {
+			for (i = 1; i <= NF; i++) if ($i == "%CPU") col = i
+			next
+		}
+		# Data row: skip the average summary at end + blank lines.
+		col && NF >= col && $1 ~ /^[0-9]/ {
+			if ($col ~ /^[0-9]+(\.[0-9]+)?$/) print $col
+		}
+	' "$logdir/pidstat.log" >"$logdir/cpu_pct.log" || true
+
+	local cpu_p50 cpu_p90
+	if [[ -s "$logdir/cpu_pct.log" ]]; then
+		cpu_p50=$(percentile_from_stream "$logdir/cpu_pct.log" 50)
+		cpu_p90=$(percentile_from_stream "$logdir/cpu_pct.log" 90)
+	else
+		cpu_p50="ERR"
+		cpu_p90="ERR"
+	fi
+
+	# GPU freq median. Values are Hz; convert to MHz via temp file (avoids
+	# unreliable /dev/stdin in a nested subshell-over-pipe).
+	local gpu_med_mhz
+	if [[ -s "$logdir/gpu_freq.log" ]]; then
+		awk '{print $1/1000000}' "$logdir/gpu_freq.log" >"$logdir/gpu_freq_mhz.log"
+		gpu_med_mhz=$(percentile_from_stream "$logdir/gpu_freq_mhz.log" 50)
+	else
+		gpu_med_mhz="—"
+	fi
+
+	# RSS delta MiB.
+	local rss_delta_mib
+	rss_delta_mib=$(awk -v s="$rss_start" -v e="$rss_end" 'BEGIN{printf "%.1f", (e-s)/1024.0}')
+
+	# Drops + p50 frame interval — only available for mpv.
+	local drops="—"
+	local p50_frame_ms="—"
+	if [[ "$kind" == "mpv" ]]; then
+		drops=$(grep -oE 'frame-drop-count[^\t ]*\s*=\s*[0-9]+' "$logdir/consumer.log" \
+			| awk -F= '{print $2}' | tr -d ' ' | tail -1)
+		drops="${drops:-0}"
+		# p50 frame interval from mpv vsync-jitter or frame timing — leave
+		# as "—" unless mpv emitted detailed timing.
+	fi
+
+	# Emit row.
+	cat >>"$WORKDIR/results.tsv" <<-ROW
+	$label	$cpu_p50	$cpu_p90	$drops	$p50_frame_ms	$gpu_med_mhz	$rss_delta_mib
+	ROW
+
+	echo "  CPU% p50=$cpu_p50  p90=$cpu_p90  drops=$drops  gpu_med=$gpu_med_mhz MHz  rss_delta=$rss_delta_mib MiB"
+	echo
+}
+
+# Header for results.
+echo "consumer	cpu_p50	cpu_p90	drops_${DURATION}s	p50_frame_ms	gpu_med_mhz	rss_delta_mib" >"$WORKDIR/results.tsv"
+
+# === Configurations ===
+
+# 1. mpv DMA-BUF zero-copy
+run_consumer "mpv-vaapi-dmabuf" \
+	"sudo -u mfritsche env LIBVA_DRIVER_NAME=v4l2_request \
+		LIBVA_V4L2_REQUEST_VIDEO_PATH=/dev/video1 \
+		LIBVA_V4L2_REQUEST_MEDIA_PATH=/dev/media0 \
+		mpv --no-config --hwdec=vaapi --vo=null --no-audio \
+		    --term-status-msg='\${frame-drop-count}' \
+		    --length=$DURATION '$FIXTURE'" \
+	mpv
+
+# 2. mpv vaapi-copy
+run_consumer "mpv-vaapi-copy" \
+	"sudo -u mfritsche env LIBVA_DRIVER_NAME=v4l2_request \
+		LIBVA_V4L2_REQUEST_VIDEO_PATH=/dev/video1 \
+		LIBVA_V4L2_REQUEST_MEDIA_PATH=/dev/media0 \
+		mpv --no-config --hwdec=vaapi-copy --vo=null --no-audio \
+		    --term-status-msg='\${frame-drop-count}' \
+		    --length=$DURATION '$FIXTURE'" \
+	mpv
+
+# 3. Firefox-fourier (iter5-amend, sandbox enabled)
+run_consumer "firefox-fourier-hw" \
+	"sudo -u mfritsche env XDG_RUNTIME_DIR=$XDG_RUNTIME_DIR \
+		WAYLAND_DISPLAY=$WAYLAND_DISPLAY DISPLAY=$DISPLAY \
+		XAUTHORITY=$XAUTHORITY \
+		LIBVA_DRIVER_NAME=v4l2_request \
+		LIBVA_V4L2_REQUEST_VIDEO_PATH=/dev/video1 \
+		LIBVA_V4L2_REQUEST_MEDIA_PATH=/dev/media0 \
+		firefox --new-window 'file://$FIXTURE'" \
+	firefox
+
+# 4. SW baseline
+run_consumer "mpv-sw-baseline" \
+	"sudo -u mfritsche mpv --no-config --hwdec=no --vo=null --no-audio \
+		--term-status-msg='\${frame-drop-count}' \
+		--length=$DURATION '$FIXTURE'" \
+	mpv
+
+# === Generate markdown table ===
+{
+	echo "# Performance binding cell — iter8 (libva-multiplanar campaign)"
+	echo
+	echo "Run date: $(date -Iseconds)"
+	echo "Host: $(uname -n) ($(uname -m))"
+	echo "Kernel: $(uname -r)"
+	echo "Driver sha256: \`$(sha256sum /usr/lib/dri/v4l2_request_drv_video.so | cut -d' ' -f1)\`"
+	echo "Fixture: \`$FIXTURE\` ($(stat -c %s "$FIXTURE") bytes)"
+	echo "Duration per consumer: ${DURATION}s"
+	echo
+	echo "| Consumer | CPU% p50 | CPU% p90 | Drops in window | p50 frame ms | GPU MHz median | VmRSS Δ MiB |"
+	echo "|---|---|---|---|---|---|---|"
+	tail -n +2 "$WORKDIR/results.tsv" | awk -F'\t' '{
+		printf "| %s | %s | %s | %s | %s | %s | %s |\n",
+			$1, $2, $3, $4, $5, $6, $7
+	}'
+} >"$WORKDIR/perf_binding_cell.md"
+
+echo "=== Done ==="
+echo "Results: $WORKDIR/perf_binding_cell.md"
+echo "Per-consumer logs: $WORKDIR/{mpv-vaapi-dmabuf,mpv-vaapi-copy,firefox-fourier-hw,mpv-sw-baseline}/"
+echo
+cat "$WORKDIR/perf_binding_cell.md"