222 lines
8.0 KiB
Rust
222 lines
8.0 KiB
Rust
extern crate bindgen;
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extern crate cc;
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extern crate walkdir;
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use std::env;
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use std::path::PathBuf;
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use walkdir::WalkDir;
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const CPAL_ASIO_DIR: &str = "CPAL_ASIO_DIR";
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const ASIO_HEADER: &str = "asio.h";
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const ASIO_SYS_HEADER: &str = "asiosys.h";
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const ASIO_DRIVERS_HEADER: &str = "asiodrivers.h";
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fn main() {
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// If ASIO directory isn't set silently return early
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let cpal_asio_dir_var = match env::var(CPAL_ASIO_DIR) {
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Err(_) => return,
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Ok(var) => var,
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};
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// Asio directory
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let cpal_asio_dir = PathBuf::from(cpal_asio_dir_var);
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// Directory where bindings and library are created
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let out_dir = PathBuf::from(env::var("OUT_DIR").expect("bad path"));
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// Check if library exists
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// if it doesn't create it
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let mut lib_path = out_dir.clone();
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lib_path.push("libasio.a");
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if !lib_path.exists() {
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create_lib(&cpal_asio_dir);
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}
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// Print out links to needed libraries
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println!("cargo:rustc-link-lib=dylib=ole32");
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println!("cargo:rustc-link-lib=dylib=User32");
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println!("cargo:rustc-link-search={}", out_dir.display());
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println!("cargo:rustc-link-lib=static=asio");
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println!("cargo:rustc-cfg=asio");
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// Check if bindings exist
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// if they dont create them
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let mut binding_path = out_dir.clone();
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binding_path.push("asio_bindings.rs");
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if !binding_path.exists() {
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create_bindings(&cpal_asio_dir);
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}
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}
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fn create_lib(cpal_asio_dir: &PathBuf) {
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let mut cpp_paths: Vec<PathBuf> = Vec::new();
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let mut host_dir = cpal_asio_dir.clone();
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let mut pc_dir = cpal_asio_dir.clone();
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let mut common_dir = cpal_asio_dir.clone();
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host_dir.push("host");
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common_dir.push("common");
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pc_dir.push("host/pc");
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// Gathers cpp files from directories
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let walk_a_dir = |dir_to_walk, paths: &mut Vec<PathBuf>| {
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for entry in WalkDir::new(&dir_to_walk).max_depth(1) {
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let entry = match entry {
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Err(e) => {
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println!("error: {}", e);
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continue;
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}
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Ok(entry) => entry,
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};
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match entry.path().extension().and_then(|s| s.to_str()) {
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None => continue,
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Some("cpp") => {
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// Skip macos bindings
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if entry.path().file_name().unwrap().to_str() == Some("asiodrvr.cpp") {
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continue;
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}
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paths.push(entry.path().to_path_buf())
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}
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Some(_) => continue,
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};
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}
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};
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// Get all cpp files for building SDK library
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walk_a_dir(host_dir, &mut cpp_paths);
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walk_a_dir(pc_dir, &mut cpp_paths);
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walk_a_dir(common_dir, &mut cpp_paths);
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// build the asio lib
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cc::Build::new()
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.include(format!("{}/{}", cpal_asio_dir.display(), "host"))
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.include(format!("{}/{}", cpal_asio_dir.display(), "common"))
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.include(format!("{}/{}", cpal_asio_dir.display(), "host/pc"))
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.include("asio-link/helpers.hpp")
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.file("asio-link/helpers.cpp")
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.files(cpp_paths)
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.cpp(true)
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.compile("libasio.a");
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}
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fn create_bindings(cpal_asio_dir: &PathBuf) {
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let mut asio_header = None;
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let mut asio_sys_header = None;
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let mut asio_drivers_header = None;
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// Recursively walk given cpal dir to find required headers
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for entry in WalkDir::new(&cpal_asio_dir) {
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let entry = match entry {
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Err(_) => continue,
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Ok(entry) => entry,
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};
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let file_name = match entry.path().file_name().and_then(|s| s.to_str()) {
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None => continue,
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Some(file_name) => file_name,
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};
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match file_name {
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ASIO_HEADER => asio_header = Some(entry.path().to_path_buf()),
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ASIO_SYS_HEADER => asio_sys_header = Some(entry.path().to_path_buf()),
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ASIO_DRIVERS_HEADER => asio_drivers_header = Some(entry.path().to_path_buf()),
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_ => (),
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}
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}
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macro_rules! header_or_panic {
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($opt_header:expr, $FILE_NAME:expr) => {
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match $opt_header.as_ref() {
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None => {
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panic!(
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"Could not find {} in {}: {}",
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$FILE_NAME,
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CPAL_ASIO_DIR,
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cpal_asio_dir.display()
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);
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}
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Some(path) => path.to_str().expect("Could not convert path to str"),
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}
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};
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}
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// Only continue if found all headers that we need
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let asio_header = header_or_panic!(asio_header, ASIO_HEADER);
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let asio_sys_header = header_or_panic!(asio_sys_header, ASIO_SYS_HEADER);
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let asio_drivers_header = header_or_panic!(asio_drivers_header, ASIO_DRIVERS_HEADER);
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// The bindgen::Builder is the main entry point
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// to bindgen, and lets you build up options for
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// the resulting bindings.
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let bindings = bindgen::Builder::default()
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// The input header we would like to generate
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// bindings for.
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.header(asio_header)
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.header(asio_sys_header)
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.header(asio_drivers_header)
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.header("asio-link/helpers.hpp")
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.clang_arg("-x")
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.clang_arg("c++")
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.clang_arg("-std=c++14")
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.clang_arg(format!("-I{}/{}", cpal_asio_dir.display(), "host/pc"))
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.clang_arg(format!("-I{}/{}", cpal_asio_dir.display(), "host"))
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.clang_arg(format!("-I{}/{}", cpal_asio_dir.display(), "common"))
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// Need to whitelist to avoid binding tp c++ std::*
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.whitelist_type("AsioDrivers")
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.whitelist_type("AsioDriver")
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.whitelist_type("ASIOTime")
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.whitelist_type("ASIOTimeInfo")
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.whitelist_type("ASIODriverInfo")
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.whitelist_type("ASIOBufferInfo")
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.whitelist_type("ASIOCallbacks")
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.whitelist_type("ASIOSamples")
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.whitelist_type("ASIOSampleType")
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.whitelist_type("ASIOSampleRate")
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.whitelist_type("ASIOChannelInfo")
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.whitelist_type("AsioTimeInfoFlags")
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.whitelist_type("ASIOTimeCodeFlags")
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.whitelist_var("kAsioSelectorSupported")
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.whitelist_var("kAsioEngineVersion")
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.whitelist_var("kAsioResetRequest")
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.whitelist_var("kAsioBufferSizeChange")
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.whitelist_var("kAsioResyncRequest")
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.whitelist_var("kAsioLatenciesChanged")
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.whitelist_var("kAsioSupportsTimeInfo")
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.whitelist_var("kAsioSupportsTimeCode")
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.whitelist_var("kAsioMMCCommand")
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.whitelist_var("kAsioSupportsInputMonitor")
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.whitelist_var("kAsioSupportsInputGain")
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.whitelist_var("kAsioSupportsInputMeter")
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.whitelist_var("kAsioSupportsOutputGain")
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.whitelist_var("kAsioSupportsOutputMeter")
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.whitelist_var("kAsioOverload")
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.whitelist_function("ASIOGetChannels")
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.whitelist_function("ASIOGetChannelInfo")
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.whitelist_function("ASIOGetBufferSize")
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.whitelist_function("ASIOGetSamplePosition")
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.whitelist_function("get_sample_rate")
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.whitelist_function("set_sample_rate")
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.whitelist_function("can_sample_rate")
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.whitelist_function("ASIOInit")
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.whitelist_function("ASIOCreateBuffers")
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.whitelist_function("ASIOStart")
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.whitelist_function("ASIOStop")
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.whitelist_function("ASIODisposeBuffers")
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.whitelist_function("ASIOExit")
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.whitelist_function("load_asio_driver")
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.whitelist_function("remove_current_driver")
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.whitelist_function("get_driver_names")
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.bitfield_enum("AsioTimeInfoFlags")
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.bitfield_enum("ASIOTimeCodeFlags")
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// Finish the builder and generate the bindings.
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.generate()
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// Unwrap the Result and panic on failure.
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.expect("Unable to generate bindings");
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// Write the bindings to the $OUT_DIR/bindings.rs file.
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let out_path = PathBuf::from(env::var("OUT_DIR").expect("bad path"));
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//panic!("path: {}", out_path.display());
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bindings
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.write_to_file(out_path.join("asio_bindings.rs"))
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.expect("Couldn't write bindings!");
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}
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