WASAPI: shared mode devices support any sample rate

README.md

@@ -29,7 +29,7 @@ behavior on every platform.
  * Supports optimal usage of each supported backend. The same API does the
    right thing whether the backend has a fixed buffer size, such as on JACK and
    CoreAudio, or whether it allows directly managing the buffer, such as on
-   ALSA or PulseAudio.
+   ALSA, PulseAudio, and WASAPI.
  * C library. Depends only on the respective backend API libraries and libc.
    Does *not* depend on libstdc++, and does *not* have exceptions, run-time type
    information, or [setjmp](http://latentcontent.net/2007/12/05/libpng-worst-api-ever/).
@@ -251,7 +251,6 @@ view `coverage/index.html` in a browser.
 
  0. implement WASAPI (Windows) backend, get examples working
     - list devices
-      - buffer duration
       - raw mode
       - watching
     - sine wave

soundio/soundio.h

@@ -358,6 +358,7 @@ struct SoundIoDevice {
     // are used. You may check that the current backend is PulseAudio and
     // ignore these min/max values.
     // For JACK and CoreAudio, buffer duration and period duration are the same.
+    // For WASAPI, buffer duration is unknown.
     double buffer_duration_min;
     double buffer_duration_max;
     double buffer_duration_current;

src/dummy.cpp

@@ -367,8 +367,8 @@ static void set_all_device_sample_rates(SoundIoDevice *device) {
     SoundIoDevicePrivate *dev = (SoundIoDevicePrivate *)device;
     device->sample_rate_count = 1;
     device->sample_rates = &dev->prealloc_sample_rate_range;
-    device->sample_rates[0].min = 8000;
+    device->sample_rates[0].min = SOUNDIO_MIN_SAMPLE_RATE;
-    device->sample_rates[0].max = 5644800;
+    device->sample_rates[0].max = SOUNDIO_MAX_SAMPLE_RATE;
 }
 
 static int set_all_device_channel_layouts(SoundIoDevice *device) {

src/pulseaudio.cpp

@@ -296,8 +296,8 @@ static void sink_info_callback(pa_context *pulse_context, const pa_sink_info *in
         // some reasonable min and max values.
         device->sample_rate_count = 1;
         device->sample_rates = &dev->prealloc_sample_rate_range;
-        device->sample_rates[0].min = min(8000, device->sample_rate_current);
+        device->sample_rates[0].min = min(SOUNDIO_MIN_SAMPLE_RATE, device->sample_rate_current);
-        device->sample_rates[0].max = max(5644800, device->sample_rate_current);
+        device->sample_rates[0].max = max(SOUNDIO_MAX_SAMPLE_RATE, device->sample_rate_current);
 
         device->current_format = from_pulseaudio_format(info->sample_spec);
         // PulseAudio performs sample format conversion, so any PulseAudio

src/soundio.hpp

@@ -169,5 +169,7 @@ struct SoundIoDevicePrivate {
 
 void soundio_destroy_devices_info(struct SoundIoDevicesInfo *devices_info);
 
+static const int SOUNDIO_MIN_SAMPLE_RATE = 8000;
+static const int SOUNDIO_MAX_SAMPLE_RATE = 5644800;
 
 #endif

src/wasapi.cpp

@@ -353,11 +353,13 @@ static int refresh_devices(SoundIoPrivate *si) {
             deinit_refresh_devices(&rd);
             return SoundIoErrorOpeningDevice;
         }
+        rd.device->sample_rate_current = rd.wave_format->Format.nSamplesPerSec;
+        // WASAPI performs resampling in shared mode, so any value is valid.
+        // Let's pick some reasonable min and max values.
         rd.device->sample_rate_count = 1;
         rd.device->sample_rates = &dev->prealloc_sample_rate_range;
-        rd.device->sample_rate_current = rd.wave_format->Format.nSamplesPerSec;
+        rd.device->sample_rates[0].min = min(SOUNDIO_MIN_SAMPLE_RATE, rd.device->sample_rate_current);
-        rd.device->sample_rates[0].min = rd.device->sample_rate_current;
+        rd.device->sample_rates[0].max = max(SOUNDIO_MAX_SAMPLE_RATE, rd.device->sample_rate_current);
-        rd.device->sample_rates[0].max = rd.device->sample_rate_current;
 
         rd.device->current_format = from_wave_format_format(rd.wave_format);
         rd.device->format_count = 1;