audio_device: Make AudioDeviceName constructor constexpr

These are used as read-only arrays, so we can make the data read-only
and available at compile-time.

Now constructing an AudioDevice no longer needs to initialize some
tables

src/audio_core/audio_in_manager.cpp

@@ -82,7 +82,7 @@ u32 Manager::GetDeviceNames(std::vector<AudioRenderer::AudioDevice::AudioDeviceN
 
     auto input_devices{Sink::GetDeviceListForSink(Settings::values.sink_id.GetValue(), true)};
     if (input_devices.size() > 1) {
-        names.push_back(AudioRenderer::AudioDevice::AudioDeviceName("Uac"));
+        names.emplace_back("Uac");
         return 1;
     }
     return 0;

src/audio_core/audio_out_manager.cpp

@@ -74,7 +74,7 @@ void Manager::BufferReleaseAndRegister() {
 
 u32 Manager::GetAudioOutDeviceNames(
     std::vector<AudioRenderer::AudioDevice::AudioDeviceName>& names) const {
-    names.push_back({"DeviceOut"});
+    names.emplace_back("DeviceOut");
     return 1;
 }
 

src/audio_core/renderer/audio_device.cpp

@@ -1,6 +1,9 @@
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <array>
+#include <span>
+
 #include "audio_core/audio_core.h"
 #include "audio_core/common/feature_support.h"
 #include "audio_core/renderer/audio_device.h"
@@ -9,6 +12,25 @@
 
 namespace AudioCore::AudioRenderer {
 
+constexpr std::array usb_device_names{
+    AudioDevice::AudioDeviceName{"AudioStereoJackOutput"},
+    AudioDevice::AudioDeviceName{"AudioBuiltInSpeakerOutput"},
+    AudioDevice::AudioDeviceName{"AudioTvOutput"},
+    AudioDevice::AudioDeviceName{"AudioUsbDeviceOutput"},
+};
+
+constexpr std::array device_names{
+    AudioDevice::AudioDeviceName{"AudioStereoJackOutput"},
+    AudioDevice::AudioDeviceName{"AudioBuiltInSpeakerOutput"},
+    AudioDevice::AudioDeviceName{"AudioTvOutput"},
+};
+
+constexpr std::array output_device_names{
+    AudioDevice::AudioDeviceName{"AudioBuiltInSpeakerOutput"},
+    AudioDevice::AudioDeviceName{"AudioTvOutput"},
+    AudioDevice::AudioDeviceName{"AudioExternalOutput"},
+};
+
 AudioDevice::AudioDevice(Core::System& system, const u64 applet_resource_user_id_,
                          const u32 revision)
     : output_sink{system.AudioCore().GetOutputSink()},
@@ -16,7 +38,7 @@ AudioDevice::AudioDevice(Core::System& system, const u64 applet_resource_user_id
 
 u32 AudioDevice::ListAudioDeviceName(std::vector<AudioDeviceName>& out_buffer,
                                      const size_t max_count) {
-    std::span<AudioDeviceName> names{};
+    std::span<const AudioDeviceName> names{};
 
     if (CheckFeatureSupported(SupportTags::AudioUsbDeviceOutput, user_revision)) {
         names = usb_device_names;

src/audio_core/renderer/audio_device.h

@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include <span>
+#include <string_view>
 
 #include "audio_core/audio_render_manager.h"
 
@@ -23,21 +23,13 @@ namespace AudioRenderer {
 class AudioDevice {
 public:
     struct AudioDeviceName {
-        std::array<char, 0x100> name;
+        std::array<char, 0x100> name{};
 
-        AudioDeviceName(const char* name_) {
+        constexpr AudioDeviceName(std::string_view name_) {
-            std::strncpy(name.data(), name_, name.size());
+            name_.copy(name.data(), name.size() - 1);
         }
     };
 
-    std::array<AudioDeviceName, 4> usb_device_names{"AudioStereoJackOutput",
-                                                    "AudioBuiltInSpeakerOutput", "AudioTvOutput",
-                                                    "AudioUsbDeviceOutput"};
-    std::array<AudioDeviceName, 3> device_names{"AudioStereoJackOutput",
-                                                "AudioBuiltInSpeakerOutput", "AudioTvOutput"};
-    std::array<AudioDeviceName, 3> output_device_names{"AudioBuiltInSpeakerOutput", "AudioTvOutput",
-                                                       "AudioExternalOutput"};
-
     explicit AudioDevice(Core::System& system, u64 applet_resource_user_id, u32 revision);
 
     /**

src/core/hle/service/audio/audout_u.cpp

@@ -246,9 +246,8 @@ void AudOutU::ListAudioOuts(Kernel::HLERequestContext& ctx) {
     const auto write_count =
         static_cast<u32>(ctx.GetWriteBufferSize() / sizeof(AudioDevice::AudioDeviceName));
     std::vector<AudioDevice::AudioDeviceName> device_names{};
-    std::string print_names{};
     if (write_count > 0) {
-        device_names.push_back(AudioDevice::AudioDeviceName("DeviceOut"));
+        device_names.emplace_back("DeviceOut");
         LOG_DEBUG(Service_Audio, "called. \nName=DeviceOut");
     } else {
         LOG_DEBUG(Service_Audio, "called. Empty buffer passed in.");