IOS/USB: Implement Wii Speak SAMPLER_FREQ register properly

Fix the default sampling rate which should be 16KHz

Source/Core/Core/IOS/USB/Emulated/Microphone.cpp

@@ -44,7 +44,7 @@ void Microphone::StreamInit()
   }
 
   // TODO: Not here but rather inside the WiiSpeak device if possible?
-  StreamStart();
+  StreamStart(m_sampler.DEFAULT_SAMPLING_RATE);
 }
 
 void Microphone::StreamTerminate()
@@ -59,12 +59,12 @@ static void state_callback(cubeb_stream* stream, void* user_data, cubeb_state st
 {
 }
 
-void Microphone::StreamStart()
+void Microphone::StreamStart(u32 sampling_rate)
 {
   if (!m_cubeb_ctx)
     return;
 
-  m_worker.Execute([this] {
+  m_worker.Execute([this, sampling_rate] {
 #ifdef ANDROID
     JNIEnv* env = IDCache::GetEnvForThread();
     if (jboolean result = env->CallStaticBooleanMethod(
@@ -80,7 +80,7 @@ void Microphone::StreamStart()
 
     cubeb_stream_params params{};
     params.format = CUBEB_SAMPLE_S16LE;
-    params.rate = SAMPLING_RATE;
+    params.rate = sampling_rate;
     params.channels = 1;
     params.layout = CUBEB_LAYOUT_MONO;
 
@@ -248,6 +248,12 @@ Microphone::FloatType Microphone::ComputeGain(FloatType relative_db) const
   return m_loudness.ComputeGain(relative_db);
 }
 
+void Microphone::SetSamplingRate(u32 sampling_rate)
+{
+  StopStream();
+  StreamStart(sampling_rate);
+}
+
 const Microphone::FloatType Microphone::Loudness::DB_MIN =
     20 * std::log10(FloatType(1) / MAX_AMPLTIUDE);
 const Microphone::FloatType Microphone::Loudness::DB_MAX = 20 * std::log10(FloatType(1));

Source/Core/Core/IOS/USB/Emulated/Microphone.h

@@ -37,6 +37,7 @@ public:
   void UpdateLoudness(std::ranges::input_range auto&& samples);
   const WiiSpeakState& GetSampler() const;
   FloatType ComputeGain(FloatType relative_db) const;
+  void SetSamplingRate(u32 sampling_rate);
 
 private:
   static long DataCallback(cubeb_stream* stream, void* user_data, const void* input_buffer,
@@ -44,12 +45,11 @@ private:
 
   void StreamInit();
   void StreamTerminate();
-  void StreamStart();
+  void StreamStart(u32 sampling_rate);
   void StopStream();
 
-  static constexpr u32 SAMPLING_RATE = 8000;
   using SampleType = s16;
-  static constexpr u32 BUFF_SIZE_SAMPLES = 16;
+  static constexpr u32 BUFF_SIZE_SAMPLES = 32;
   static constexpr u32 STREAM_SIZE = BUFF_SIZE_SAMPLES * 500;
 
   std::array<SampleType, STREAM_SIZE> m_stream_buffer{};
@@ -96,8 +96,8 @@ private:
     void Reset();
     void LogStats();
 
-    // Samples used to compute the loudness level
-    static constexpr u16 SAMPLES_NEEDED = SAMPLING_RATE / 125;
+    // Samples used to compute the loudness level (arbitrarily chosen)
+    static constexpr u16 SAMPLES_NEEDED = 128;
     static_assert((SAMPLES_NEEDED % BUFF_SIZE_SAMPLES) == 0);
 
     static constexpr FloatType MAX_AMPLTIUDE = std::numeric_limits<UnsignedSampleType>::max() / 2;

Source/Core/Core/IOS/USB/Emulated/WiiSpeak.cpp

@@ -250,8 +250,6 @@ void WiiSpeak::SetRegister(const std::unique_ptr<CtrlMessage>& cmd)
     m_sampler.sample_on = !!arg1;
     break;
   case SAMPLER_FREQ:
-    WARN_LOG_FMT(IOS_USB, "Wii Speak SAMPLER_FREQ set (arg1={:04x}, arg2={:04x}) not implemented",
-                 arg1, arg2);
     switch (arg1)
     {
     case FREQ_8KHZ:
@@ -271,6 +269,8 @@ void WiiSpeak::SetRegister(const std::unique_ptr<CtrlMessage>& cmd)
       m_sampler.freq = 16000;
       break;
     }
+    if (m_microphone)
+      m_microphone->SetSamplingRate(m_sampler.freq);
     break;
   case SAMPLER_GAIN:
     WARN_LOG_FMT(IOS_USB, "Wii Speak SAMPLER_GAIN set (arg1={:04x}, arg2={:04x}) not implemented",

Source/Core/Core/IOS/USB/Emulated/WiiSpeak.h

@@ -21,6 +21,8 @@ struct WiiSpeakState
   int gain;
   bool ec_reset;
   bool sp_on;
+
+  static constexpr u32 DEFAULT_SAMPLING_RATE = 16000;
 };
 
 class WiiSpeak final : public Device