frontend: Add support for TEB/Multitrack Video to macOS (arm64 only)

frontend/settings/OBSBasicSettings.cpp

@@ -5588,7 +5588,9 @@ void OBSBasicSettings::UpdateMultitrackVideo()
 			ui->enableMultitrackVideo->setChecked(false);
 	}
 
-#ifndef _WIN32
+	// Enhanced Broadcasting works on Windows and Apple Silicon Macs.
+	// For other OS variants, only enable the GUI controls if developer mode was invoked.
+#if !defined(_WIN32) && !(defined(__APPLE__) && defined(__aarch64__))
 	available = available && MultitrackVideoDeveloperModeEnabled();
 #endif
 

frontend/utility/system-info-macos.mm

@@ -1,6 +1,96 @@
 #include "system-info.hpp"
 
+#ifdef __aarch64__
+#import <util/platform.h>
+
+#import <Foundation/Foundation.h>
+#import <Foundation/NSProcessInfo.h>
+#import <sys/sysctl.h>
+#import <sys/types.h>
+
+static std::optional<std::string> getCpuName()
+{
+    std::string name;
+    size_t size;
+    int ret;
+
+    ret = sysctlbyname("machdep.cpu.brand_string", NULL, &size, NULL, 0);
+    if (ret != 0)
+        return std::nullopt;
+
+    name.resize(size);
+
+    ret = sysctlbyname("machdep.cpu.brand_string", name.data(), &size, NULL, 0);
+    if (ret != 0)
+        return std::nullopt;
+
+    // Remove null terminator
+    name.resize(name.find('\0'));
+    return name;
+}
+
+// Apple Silicon Macs have a single SoC that contains both GPU and CPU, the same information is valid for both.
+static void fillSoCInfo(GoLiveApi::Capabilities &capabilities)
+{
+    capabilities.cpu.name = getCpuName();
+    // Getting the frequency is not supported on Apple Silicon.
+    capabilities.cpu.physical_cores = os_get_physical_cores();
+    capabilities.cpu.logical_cores = os_get_logical_cores();
+
+    capabilities.memory.total = os_get_sys_total_size();
+    capabilities.memory.free = os_get_sys_free_size();
+
+    // Apple Silicon does not support dGPUs, there's only going to be one (the SoC).
+    GoLiveApi::Gpu gpu;
+    gpu.model = capabilities.cpu.name.value_or("Unknown");
+    gpu.vendor_id = 0x106b;  // Always Apple
+    gpu.device_id = 0;       // Always 0 for Apple Silicon
+
+    std::vector<GoLiveApi::Gpu> gpus;
+    gpus.push_back(std::move(gpu));
+    capabilities.gpu = gpus;
+}
+
+static void fillSystemInfo(GoLiveApi::System &sysinfo)
+{
+    NSProcessInfo *procInfo = [NSProcessInfo processInfo];
+    NSOperatingSystemVersion versionObj = [procInfo operatingSystemVersion];
+
+    sysinfo.name = "macOS";
+    sysinfo.bits = 64;  // 32-bit macOS is long deprecated.
+    sysinfo.version = [[procInfo operatingSystemVersionString] UTF8String];
+
+    switch (versionObj.majorVersion) {
+        case 11:
+            sysinfo.release = "Big Sur";
+            break;
+        case 12:
+            sysinfo.release = "Monterey";
+            break;
+        case 13:
+            sysinfo.release = "Ventura";
+            break;
+        case 14:
+            sysinfo.release = "Sonoma";
+            break;
+        case 15:
+            sysinfo.release = "Sequoia";
+            break;
+        default:
+            sysinfo.release = "unknown";
+    }
+
+    sysinfo.arm = true;
+    sysinfo.armEmulation = false;
+}
+#endif
+
 void system_info(GoLiveApi::Capabilities &capabilities)
 {
+#ifdef __aarch64__
+    fillSoCInfo(capabilities);
+    fillSystemInfo(capabilities.system);
+#else
     UNUSED_PARAMETER(capabilities);
+#endif
 }