#!/usr/bin/env bash
# Build + install libdav1d — the VideoLAN AV1 decoder, ~10× faster
# than ffmpeg's internal AV1 decoder on 4K content. Linked into our
# source-built ffmpeg via --enable-libdav1d so AV1 video playback in
# notcurses matches the perf profile users get on package-managed
# lanes (musl/Windows still bundle dav1d via their system ffmpeg;
# macOS arm64 source-builds it here as of the LGPL conversion).
#
# Honours $PREFIX (default /usr/local). Honours $MACOSX_DEPLOYMENT_TARGET
# on macOS — meson reads it via clang's defaults so produced dylibs
# stamp LC_BUILD_VERSION minos appropriately.
#
# Build system: meson + ninja. Caller must have both on PATH before
# invoking this script:
# * manylinux_2_28: pip install meson ninja via /opt/python/cp*/bin
# * macOS x86_64: brew install meson ninja (via x86_64 brew)
# * macOS arm64: brew install meson ninja (native brew)
#
# nasm is needed on x86_64 for SIMD acceleration; not used on
# aarch64 (dav1d uses ARM-native NEON assembly there).
set -euxo pipefail
# 1.5.4 — newest release tag upstream has cut (brew is a point
# release behind at 1.5.3). Matters more than it used to: the macOS
# arm64 lane now source-builds this rather than inheriting brew's
# dav1d as a transitive dep of brew's ffmpeg.
VERSION='1.5.4'
URL="https://code.videolan.org/videolan/dav1d/-/archive/${VERSION}/dav1d-${VERSION}.tar.bz2"
PREFIX="${PREFIX:-/usr/local}"
mkdir -p "$PREFIX"
JOBS="$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 4)"
cd /tmp
curl -fSL --retry 5 --retry-delay 10 -o dav1d.tar.bz2 "$URL"
tar -xjf dav1d.tar.bz2
cd "dav1d-${VERSION}"
# --default-library=shared — bundleable .so / .dylib.
# --buildtype=release — optimization on, strip-friendly.
# --strip — strip debug symbols at install time (smaller bundle).
# enable_tools=false / enable_tests=false — we don't ship dav1d's
# CLI or its test suite.
meson setup \
--prefix="$PREFIX" \
--libdir=lib \
--default-library=shared \
--buildtype=release \
--strip \
-Denable_tools=false \
-Denable_tests=false \
build
meson compile -C build -j "$JOBS"
meson install -C build
PKG_CONFIG_PATH="$PREFIX/lib/pkgconfig:${PKG_CONFIG_PATH:-}" \
pkg-config --modversion dav1d
cd /
rm -rf "/tmp/dav1d-${VERSION}" /tmp/dav1d.tar.bz2