AudioIOStartStreamOptions includes the sample rate

src/AudioIO.cpp

@@ -1520,12 +1520,14 @@ int AudioIO::StartStream(const WaveTrackArray &playbackTracks,
 #ifdef EXPERIMENTAL_MIDI_OUT
                          const NoteTrackArray &midiPlaybackTracks,
 #endif
-                         double sampleRate, double t0, double t1,
+                         double t0, double t1,
                          const AudioIOStartStreamOptions &options)
 {
    if( IsBusy() )
       return 0;
 
+   const auto &sampleRate = options.rate;
+
    // We just want to set mStreamToken to -1 - this way avoids
    // an extremely rare but possible race condition, if two functions
    // somehow called StartStream at the same time...

src/AudioIO.h

@@ -88,9 +88,11 @@ DECLARE_EXPORTED_EVENT_TYPE(AUDACITY_DLL_API, EVT_AUDIOIO_MONITOR, -1);
 // To avoid growing the argument list of StartStream, add fields here
 struct AudioIOStartStreamOptions
 {
-   AudioIOStartStreamOptions()
+   explicit
+   AudioIOStartStreamOptions(double rate_)
       : timeTrack(NULL)
       , listener(NULL)
+      , rate(rate_)
       , playLooped(false)
       , cutPreviewGapStart(0.0)
       , cutPreviewGapLen(0.0)
@@ -106,6 +108,7 @@ struct AudioIOStartStreamOptions
 
    TimeTrack *timeTrack;
    AudioIOListener* listener;
+   double rate;
    bool playLooped;
    double cutPreviewGapStart;
    double cutPreviewGapLen;
@@ -163,9 +166,8 @@ class AUDACITY_DLL_API AudioIO final {
 #ifdef EXPERIMENTAL_MIDI_OUT
                    const NoteTrackArray &midiTracks,
 #endif
-                   double sampleRate, double t0, double t1,
+                   double t0, double t1,
-                   const AudioIOStartStreamOptions &options =
+                   const AudioIOStartStreamOptions &options);
-                      AudioIOStartStreamOptions());
 
    /** \brief Stop recording, playback or input monitoring.
     *

src/Project.cpp

@@ -1131,7 +1131,7 @@ AudacityProject::~AudacityProject()
 
 AudioIOStartStreamOptions AudacityProject::GetDefaultPlayOptions()
 {
-   AudioIOStartStreamOptions options;
+   AudioIOStartStreamOptions options { GetRate() };
    options.timeTrack = GetTracks()->GetTimeTrack();
    options.listener = this;
    return options;

src/effects/Effect.cpp

@@ -2534,7 +2534,7 @@ void Effect::Preview(bool dryOnly)
    double previewLen;
    gPrefs->Read(wxT("/AudioIO/EffectsPreviewLen"), &previewLen, 6.0);
 
-   double rate = mProjectRate;
+   const double rate = mProjectRate;
 
    if (isNyquist && isGenerator) {
       previewDuration = CalcPreviewInputLength(previewLen);
@@ -2637,12 +2637,13 @@ void Effect::Preview(bool dryOnly)
       NoteTrackArray empty;
 #endif
       // Start audio playing
+      AudioIOStartStreamOptions options { rate };
       int token =
          gAudioIO->StartStream(playbackTracks, recordingTracks,
 #ifdef EXPERIMENTAL_MIDI_OUT
                                empty,
 #endif
-                               rate, mT0, t1);
+                               mT0, t1, options);
 
       if (token) {
          int previewing = eProgressSuccess;

src/toolbars/ControlToolBar.cpp

@@ -634,7 +634,7 @@ int ControlToolBar::PlayPlayRegion(const SelectedRegion &selectedRegion,
 #ifdef EXPERIMENTAL_MIDI_OUT
                NoteTrackArray(),
 #endif
-               p->GetRate(), tcp0, tcp1, myOptions);
+               tcp0, tcp1, myOptions);
          } else
          {
             // Cannot create cut preview tracks, clean up and exit
@@ -655,7 +655,7 @@ int ControlToolBar::PlayPlayRegion(const SelectedRegion &selectedRegion,
 #ifdef EXPERIMENTAL_MIDI_OUT
                                        t->GetNoteTrackArray(false),
 #endif
-                                       p->GetRate(), t0, t1, options);
+                                       t0, t1, options);
       }
       if (token != 0) {
          success = true;
@@ -1085,7 +1085,7 @@ void ControlToolBar::OnRecord(wxCommandEvent &evt)
 #ifdef EXPERIMENTAL_MIDI_OUT
                                         midiTracks,
 #endif
-                                        p->GetRate(), t0, t1, options);
+                                        t0, t1, options);
 
       bool success = (token != 0);