service/audren_u: Report proper device names

AudioDevice and AudioInterface aren't valid device names on the Switch.
We should also be returning consistent names in
GetActiveAudioDeviceName().

While we're at it, we can also handle proper name output in
ListAudioDeviceName, by returning all the available devices on the
Switch.

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

@@ -5,6 +5,7 @@
 #include <algorithm>
 #include <array>
 #include <memory>
+#include <string_view>
 
 #include "audio_core/audio_renderer.h"
 #include "common/alignment.h"
@@ -160,7 +161,7 @@ private:
 
 class IAudioDevice final : public ServiceFramework<IAudioDevice> {
 public:
-    IAudioDevice() : ServiceFramework("IAudioDevice") {
+    explicit IAudioDevice() : ServiceFramework("IAudioDevice") {
         static const FunctionInfo functions[] = {
             {0, &IAudioDevice::ListAudioDeviceName, "ListAudioDeviceName"},
             {1, &IAudioDevice::SetAudioDeviceOutputVolume, "SetAudioDeviceOutputVolume"},
@@ -189,15 +190,32 @@ public:
     }
 
 private:
+    using AudioDeviceName = std::array<char, 256>;
+    static constexpr std::array<std::string_view, 4> audio_device_names{{
+        "AudioStereoJackOutput",
+        "AudioBuiltInSpeakerOutput",
+        "AudioTvOutput",
+        "AudioUsbDeviceOutput",
+    }};
+
     void ListAudioDeviceName(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service_Audio, "(STUBBED) called");
 
-        constexpr std::array<char, 15> audio_interface{{"AudioInterface"}};
-        ctx.WriteBuffer(audio_interface);
+        const std::size_t num_names_requested = ctx.GetWriteBufferSize() / sizeof(AudioDeviceName);
+        const std::size_t num_to_copy = std::min(num_names_requested, audio_device_names.size());
+        std::vector<AudioDeviceName> name_buffer(num_to_copy);
+
+        for (std::size_t i = 0; i < num_to_copy; i++) {
+            const auto& device_name = audio_device_names[i];
+
+            device_name.copy(name_buffer[i].data(), device_name.size());
+        }
+
+        ctx.WriteBuffer(name_buffer);
 
         IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
-        rb.Push<u32>(1);
+        rb.Push(static_cast<u32>(num_to_copy));
     }
 
     void SetAudioDeviceOutputVolume(Kernel::HLERequestContext& ctx) {
@@ -216,8 +234,13 @@ private:
     void GetActiveAudioDeviceName(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service_Audio, "(STUBBED) called");
 
-        constexpr std::array<char, 12> audio_interface{{"AudioDevice"}};
-        ctx.WriteBuffer(audio_interface);
+        // Currently set to always be TV audio output.
+        const auto& device_name = audio_device_names[2];
+
+        AudioDeviceName out_device_name{};
+        device_name.copy(out_device_name.data(), device_name.size());
+
+        ctx.WriteBuffer(out_device_name);
 
         IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);