Add tvOS support with consolidated Apple examples (#146)

Add tvOS as a supported platform alongside iOS. Both platforms now share
a single example in examples/apple/ with one Xcode project containing
targets for both iOS and tvOS.

Changes:
- Add tvOS target support (aarch64-apple-tvos, aarch64-apple-tvos-sim)
- Consolidate examples/ios and examples/tvos into examples/apple
- Single Xcode project with iOS and tvOS targets sharing source files
- Unified sine wave demo (440Hz) for both platforms
- Platform-specific code via #[cfg(target_os)] in Rust and
  #if TARGET_OS_TV in Objective-C
- SDK-conditional library search paths in Xcode project
- Build script detects SDKROOT to build only relevant targets
- Update CI workflow for both platforms

tvOS is a Tier 3 target requiring nightly toolchain with -Zbuild-std.

Author: benroeder

.github/workflows/coreaudio-rs.yml

@@ -58,11 +58,29 @@ jobs:
       with:
         toolchain: stable
     - name: Add iOS targets
-      run: rustup target add aarch64-apple-ios x86_64-apple-ios
-    - name: Install cargo lipo
-      run: cargo install cargo-lipo
+      run: rustup target add aarch64-apple-ios aarch64-apple-ios-sim
     - name: Build iphonesimulator feedback example
-      run: cd examples/ios && xcodebuild ONLY_ACTIVE_ARCH=NO ARCHS=x86_64 -scheme coreaudio-ios-example -configuration Debug -derivedDataPath build -sdk iphonesimulator
+      run: cd examples/apple && xcodebuild ONLY_ACTIVE_ARCH=NO ARCHS=arm64 -scheme coreaudio-ios-example -configuration Debug -derivedDataPath build -sdk iphonesimulator
+
+  tvos-build:
+    runs-on: macOS-latest
+    steps:
+    - uses: actions/checkout@v6
+    - uses: dtolnay/rust-toolchain@master
+      with:
+        toolchain: nightly
+        components: rust-src
+    - name: Build for tvOS simulator
+      run: cd examples/apple && cargo +nightly build -Zbuild-std --target aarch64-apple-tvos-sim --release
+    - name: Build for tvOS device
+      run: cd examples/apple && cargo +nightly build -Zbuild-std --target aarch64-apple-tvos --release
+    - uses: dtolnay/rust-toolchain@master
+      with:
+        toolchain: stable
+    - name: Add iOS targets
+      run: rustup target add aarch64-apple-ios aarch64-apple-ios-sim
+    - name: Build appletvsimulator example
+      run: cd examples/apple && xcodebuild ONLY_ACTIVE_ARCH=NO ARCHS=arm64 -scheme coreaudio-tvos-example -configuration Debug -derivedDataPath build -sdk appletvsimulator
 
   # Build the docs with all features to make sure docs.rs will work.
   macos-docs:

.gitignore

@@ -3,3 +3,7 @@ target/
 .cargo/
 .DS_Store
 llvm/
+
+# Xcode build artifacts
+examples/*/build/
+examples/*/Cargo.lock

examples/ios/Cargo.toml examples/apple/Cargo.tomlexamples/ios/Cargo.toml renamed to examples/apple/Cargo.toml

@@ -1,11 +1,11 @@
 [package]
-name = "coreaudio-ios-example"
+name = "coreaudio-apple-example"
 version = "0.1.0"
 authors = ["Michael Hills <mhills@gmail.com>"]
 edition = "2018"
 
 [lib]
-name = "coreaudio_ios_example"
+name = "coreaudio_apple_example"
 crate-type = ["staticlib"]
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

examples/ios/ios-src/AppDelegate.h examples/apple/apple-src/AppDelegate.hexamples/ios/ios-src/AppDelegate.h renamed to examples/apple/apple-src/AppDelegate.h

@@ -1,14 +1,17 @@
 //
 //  AppDelegate.m
-//  coreaudio-ios-example
+//  coreaudio-apple-example
 //
 //  Created by Michael Hills on 2/10/20.
 //
 
 #import "AppDelegate.h"
+#if TARGET_OS_TV
+#import "ViewController.h"
+#endif
 @import AVFoundation;
 
-void rust_ios_main(void);
+void rust_apple_main(void);
 
 
 @interface AppDelegate ()
@@ -21,27 +24,40 @@ @implementation AppDelegate
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     // Override point for customization after application launch.
-    
+
+#if TARGET_OS_TV
+    // tvOS requires programmatic window creation (no storyboards)
+    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+    self.window.rootViewController = [[ViewController alloc] init];
+    [self.window makeKeyAndVisible];
+#endif
+
     NSError *error;
     BOOL success;
-    
+
     // It is necessary to access the sharedInstance so that calls to AudioSessionGetProperty
     // will work.
     AVAudioSession *session = AVAudioSession.sharedInstance;
-    // Setting up the category is not necessary, but generally advised.
+
+#if TARGET_OS_TV
+    // tvOS only supports Playback category (no microphone input, no DefaultToSpeaker)
+    success = [session setCategory:AVAudioSessionCategoryPlayback error:&error];
+#else
+    // iOS: Setting up the category is not necessary, but generally advised.
     // Since this demo records and plays, lets use AVAudioSessionCategoryPlayAndRecord.
     // Also default to speaker as defaulting to the phone earpiece would be unusual.
     success = [session setCategory:AVAudioSessionCategoryPlayAndRecord
                        withOptions:AVAudioSessionCategoryOptionDefaultToSpeaker
                              error:&error];
+#endif
 
     if (success) {
-        NSLog(@"Calling rust_ios_main()");
-        rust_ios_main();
+        NSLog(@"Calling rust_apple_main()");
+        rust_apple_main();
     } else {
-        NSLog(@"Failed to configure audio session category");
+        NSLog(@"Failed to configure audio session category: %@", error);
     }
-    
+
     return YES;
 }
 

examples/ios/ios-src/AppDelegate.m examples/apple/apple-src/AppDelegate.mexamples/ios/ios-src/AppDelegate.m renamed to examples/apple/apple-src/AppDelegate.m

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
+</dict>
+</plist>