* Updated WasapiOut to provide the preferred sample rate for the

selected device
* Updated FfmpegDecoder to accept the preferred sample rate from the
  output, and use it when resampling if it is non-negative. Otherwise,
  use the sample rate defined by the file.

Note: this is not wired up in the main app yet.

src/plugins/ffmpegdecoder/FfmpegDecoder.cpp

@@ -52,6 +52,8 @@ using namespace musik::core::sdk;
 static const char* TAG = "ffmpegdecoder";
 static IDebug* debug = nullptr;
 
+#define RESOLVE_SAMPLE_RATE() this->preferredSampleRate > 0 ? this->preferredSampleRate : this->rate
+
 extern "C" DLLEXPORT void SetDebug(IDebug* debug) {
     ::debug = debug;
 }
@@ -149,6 +151,7 @@ FfmpegDecoder::FfmpegDecoder() {
     this->bufferSize = AV_INPUT_BUFFER_PADDING_SIZE + BUFFER_SIZE;
     this->buffer = new unsigned char[this->bufferSize];
     this->outputFifo = nullptr;
+    this->preferredSampleRate = -1;
 }
 
 FfmpegDecoder::~FfmpegDecoder() {
@@ -192,7 +195,7 @@ double FfmpegDecoder::SetPosition(double seconds) {
 
 bool FfmpegDecoder::GetBuffer(IBuffer *buffer) {
     if (this->ioContext) {
-        buffer->SetSampleRate((long) this->rate);
+        buffer->SetSampleRate((long) RESOLVE_SAMPLE_RATE());
         buffer->SetChannels((long) this->channels);
         buffer->SetSamples(0);
 
@@ -256,7 +259,7 @@ bool FfmpegDecoder::InitializeResampler(IBuffer* buffer) {
         this->resampler,
         this->codecContext->channel_layout,
         AV_SAMPLE_FMT_FLT,
-        (int) this->rate,
+        (int) RESOLVE_SAMPLE_RATE(),
         this->codecContext->channel_layout,
         this->codecContext->sample_fmt,
         this->codecContext->sample_rate,
@@ -404,7 +407,7 @@ bool FfmpegDecoder::ReadSendAndReceivePacket(AVPacket* packet) {
             this->resampledFrame = this->AllocFrame(
                 this->resampledFrame,
                 AV_SAMPLE_FMT_FLT,
-                this->rate,
+                RESOLVE_SAMPLE_RATE(),
                 this->decodedFrame->nb_samples);
 
             error = swr_convert_frame(

src/plugins/ffmpegdecoder/FfmpegDecoder.h

@@ -64,7 +64,7 @@ class FfmpegDecoder: public musik::core::sdk::IDecoder {
         double GetDuration() override;
         bool Open(musik::core::sdk::IDataStream *stream) override;
         bool Exhausted() override;
-        void SetPreferredSampleRate(int rate) override { }
+        void SetPreferredSampleRate(int rate) override { this->preferredSampleRate = rate; }
 
         IDataStream* Stream() { return this->stream; }
 
@@ -87,6 +87,7 @@ class FfmpegDecoder: public musik::core::sdk::IDecoder {
         AVFrame* resampledFrame;
         SwrContext* resampler;
         unsigned char* buffer;
+        int preferredSampleRate { -1 };
         int bufferSize;
         int rate, channels;
         int streamId;

src/plugins/wasapiout/WasapiOut.cpp

@@ -514,13 +514,27 @@ found_or_done:
     return result;
 }
 
-bool WasapiOut::Configure(IBuffer *buffer) {
-    HRESULT result;
+int WasapiOut::GetDefaultSampleRate() {
+    int result = -1;
+    this->InitializeAudioClient();
+    if (this->audioClient) {
+        WAVEFORMATEX* deviceFormat = nullptr;
+        audioClient->GetMixFormat(&deviceFormat);
+        if (deviceFormat) {
+            result = deviceFormat->nSamplesPerSec;
+            CoTaskMemFree(deviceFormat);
+        }
+    }
+    return result;
+}
+
+bool WasapiOut::InitializeAudioClient() {
+    CoInitializeEx(nullptr, COINIT_MULTITHREADED);
+
+    HRESULT result = S_FALSE;
 
     if (!this->audioClient) {
         if (!this->enumerator) {
-            CoInitializeEx(nullptr, COINIT_MULTITHREADED);
-
             result = CoCreateInstance(
                 __uuidof(MMDeviceEnumerator),
                 NULL,
@@ -542,14 +556,7 @@ bool WasapiOut::Configure(IBuffer *buffer) {
         }
     }
 
-    if (waveFormat.Format.nChannels == buffer->Channels() &&
-        waveFormat.Format.nSamplesPerSec == buffer->SampleRate())
-    {
-        return true;
-    }
-
-    CoInitializeEx(nullptr, COINIT_MULTITHREADED);
-
+    if (!this->device) {
         bool preferredDeviceOk = false;
 
         IMMDevice* preferredDevice = this->GetPreferredDevice();
@@ -573,6 +580,19 @@ bool WasapiOut::Configure(IBuffer *buffer) {
         if ((result = this->device->Activate(__uuidof(IAudioClient), CLSCTX_ALL, NULL, (void**)&this->audioClient)) != S_OK) {
             return false;
         }
+    }
+}
+
+bool WasapiOut::Configure(IBuffer *buffer) {
+    if (this->audioClient &&
+        waveFormat.Format.nChannels == buffer->Channels() &&
+        waveFormat.Format.nSamplesPerSec == buffer->SampleRate())
+    {
+        return true;
+    }
+
+    this->Reset();
+    this->InitializeAudioClient();
 
     DWORD speakerConfig = 0;
     switch (buffer->Channels()) {
@@ -605,6 +625,8 @@ bool WasapiOut::Configure(IBuffer *buffer) {
     wf.dwChannelMask = speakerConfig;
     wf.SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 
+    HRESULT result = S_FALSE;
+
     DWORD streamFlags = 0;
     if (this->audioClient->IsFormatSupported(AUDCLNT_SHAREMODE_SHARED, (WAVEFORMATEX *) &wf, 0) != S_OK) {
         streamFlags |= AUDCLNT_STREAMFLAGS_AUTOCONVERTPCM;

src/plugins/wasapiout/WasapiOut.h

@@ -70,6 +70,7 @@ class WasapiOut : public IOutput {
         IDeviceList* GetDeviceList() override;
         bool SetDefaultDevice(const char* deviceId) override;
         IDevice* GetDefaultDevice() override;
+        int GetDefaultSampleRate() override;
 
         void OnDeviceChanged() { this->deviceChanged = true; }
 
@@ -81,6 +82,7 @@ class WasapiOut : public IOutput {
         };
 
         bool Configure(IBuffer *buffer);
+        bool InitializeAudioClient();
         void Reset();
         IMMDevice* GetPreferredDevice();