Proto-to-Prod

bin/build-audio

@@ -0,0 +1,95 @@
+#!/usr/bin/env bash
+# Sides are encoded individually — no concatenation. Idempotent: a side is
+# skipped if its output is newer than its source.
+set -euo pipefail
+
+REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+MANIFEST="${MANIFEST:-$REPO_ROOT/content/audio.yaml}"
+RAW_DIR="${RAW_DIR:-$REPO_ROOT/content/audio}"
+OUT_DIR="${OUT_DIR:-$REPO_ROOT/web/static/audio}"
+
+for tool in yq ffmpeg; do
+	if ! command -v "$tool" >/dev/null; then
+		echo "error: $tool not in PATH (try: nix develop)" >&2
+		exit 1
+	fi
+done
+
+if [[ ! -f "$MANIFEST" ]]; then
+	echo "error: manifest not found: $MANIFEST" >&2
+	exit 1
+fi
+
+mkdir -p "$OUT_DIR"
+
+DEFAULT_BITRATE=$(yq -r '.defaults.bitrate // "64k"' "$MANIFEST")
+DEFAULT_CHANNELS=$(yq -r '.defaults.channels // "2"' "$MANIFEST")
+DEFAULT_RATE=$(yq -r '.defaults.sample_rate // "48000"' "$MANIFEST")
+
+encoded=0
+skipped=0
+missing=0
+failed=0
+
+NUM_ARTISTS=$(yq '.artists | length' "$MANIFEST")
+
+for ((a=0; a<NUM_ARTISTS; a++)); do
+	ARTIST_SLUG=$(yq -r ".artists[$a].slug" "$MANIFEST")
+	NUM_SHOWS=$(yq ".artists[$a].shows | length" "$MANIFEST")
+
+	for ((s=0; s<NUM_SHOWS; s++)); do
+		SHOW_SLUG=$(yq -r ".artists[$a].shows[$s].slug" "$MANIFEST")
+		NUM_SIDES=$(yq ".artists[$a].shows[$s].sides | length" "$MANIFEST")
+
+		for ((sd=0; sd<NUM_SIDES; sd++)); do
+			SIDE_ID=$(yq -r ".artists[$a].shows[$s].sides[$sd].id" "$MANIFEST")
+			SOURCE=$(yq -r ".artists[$a].shows[$s].sides[$sd].source" "$MANIFEST")
+			BITRATE=$(yq -r ".artists[$a].shows[$s].sides[$sd].bitrate // \"$DEFAULT_BITRATE\"" "$MANIFEST")
+			CHANNELS=$(yq -r ".artists[$a].shows[$s].sides[$sd].channels // \"$DEFAULT_CHANNELS\"" "$MANIFEST")
+			RATE=$(yq -r ".artists[$a].shows[$s].sides[$sd].sample_rate // \"$DEFAULT_RATE\"" "$MANIFEST")
+
+			SRC_PATH="$RAW_DIR/$SOURCE"
+			OUT_NAME="${ARTIST_SLUG}-${SHOW_SLUG}-${SIDE_ID}.opus"
+			OUT_PATH="$OUT_DIR/$OUT_NAME"
+
+			if [[ ! -f "$SRC_PATH" ]]; then
+				printf '  %-50s SKIP (source not present)\n' "$OUT_NAME"
+				missing=$((missing + 1))
+				continue
+			fi
+
+			if [[ -f "$OUT_PATH" ]]; then
+				src_mt=$(stat -c %Y "$SRC_PATH")
+				out_mt=$(stat -c %Y "$OUT_PATH")
+				if (( out_mt > src_mt )); then
+					printf '  %-50s up to date\n' "$OUT_NAME"
+					skipped=$((skipped + 1))
+					continue
+				fi
+			fi
+
+			printf '  %-50s encoding ...\n' "$OUT_NAME"
+
+			if ffmpeg \
+				-i "$SRC_PATH" \
+				-c:a libopus -b:a "$BITRATE" -ac "$CHANNELS" -ar "$RATE" \
+				-application audio -vbr on -compression_level 10 \
+				-y "$OUT_PATH" \
+				-hide_banner -loglevel warning -nostdin </dev/null; then
+				size=$(du -h "$OUT_PATH" | cut -f1)
+				printf '  %-50s done (%s)\n' "$OUT_NAME" "$size"
+				encoded=$((encoded + 1))
+			else
+				printf '  %-50s FAILED\n' "$OUT_NAME" >&2
+				failed=$((failed + 1))
+			fi
+		done
+	done
+done
+
+printf '\n%d encoded · %d up-to-date · %d missing sources · %d failed\n' \
+	"$encoded" "$skipped" "$missing" "$failed"
+
+if (( failed > 0 )); then
+	exit 1
+fi