audio: WASAPI exclusive resampling, buffer size increase options (#727)

## Link to GitHub Issue or related Pull Request, if one exists
n/a

## Description of change

Resampler:
Implement resampler for exclusive mode streams, as we are seeing more
and more devices - not just laptops but onboard audio devices - that
only support 48khz and not 44.1khz. Should work with volume boost (gain
calculated inside resample) and also downmixer (hands off intermediate
scratch buffers).

Buffer size increase:
By default many of these games request a tiny buffer when in shared mode
(TDJ uses 3ms). On some audio setup this results in crackling due to
underflow. Add an option to forcibly increase the buffer size.

## Testing
With resampler set to 48kHz and buffer set to 20ms I can reliably boot
and play IIDX on my display port monitor's speakers; previously this
wasn't possible. IIDX is event-driven.

Tested SDVX7 as well at 48kHz, which opens timer-driven streams.

src/spice2x/launcher/launcher.cpp

@@ -1106,6 +1106,18 @@ int main_implementation(int argc, char *argv[]) {
             hooks::audio::VOLUME_BOOST = (float) std::pow(10.0, decibels / 20.0);
         }
     }
+    if (options[launcher::Options::AudioResample].is_active()) {
+        const uint32_t rate = options[launcher::Options::AudioResample].value_uint32();
+        if (rate > 0) {
+            hooks::audio::RESAMPLE_RATE = rate;
+        }
+    }
+    if (options[launcher::Options::AudioExclusiveBuffer].is_active()) {
+        const uint32_t ms = options[launcher::Options::AudioExclusiveBuffer].value_uint32();
+        if (ms > 0) {
+            hooks::audio::EXCLUSIVE_BUFFER_MS = ms;
+        }
+    }
 
     if (options[launcher::Options::AudioBackend].is_active()) {
         auto &name = options[launcher::Options::AudioBackend].value_text();

src/spice2x/launcher/options.cpp

@@ -1984,6 +1984,37 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
             {"30", "+30 dB"},
         },
     },
+    {
+        // AudioResample
+        .title = "WASAPI Exclusive Mode Resampling",
+        .name = "resample",
+        .desc = "Resamples the hooked audio output to a fixed sample rate before it reaches the "
+            "device. Useful when a game requests a sample rate the device cannot output in "
+            "exclusive mode (e.g. the game wants 44100 Hz but the device is locked to 48000 Hz).\n\n"
+            "Select the TARGET sample rate (one that your audio card supports).\n\n"
+            "Will result in couple milliseconds of latency and increased CPU usage when active.",
+        .type = OptionType::Enum,
+        .category = "Audio",
+        .elements = {
+            {"44100", "44.1 kHz"},
+            {"48000", "48 kHz"},
+            {"88200", "88.2 kHz"},
+            {"96000", "96 kHz"},
+            {"176400", "176.4 kHz"},
+            {"192000", "192 kHz"},
+        },
+    },
+    {
+        // AudioExclusiveBuffer
+        .title = "WASAPI Exclusive Buffer Size",
+        .name = "exclusivebuffer",
+        .desc = "Enlarges the WASAPI exclusive-mode device buffer to the specified duration in milliseconds.\n\n"
+            "Try setting this to 10 or even 20 if you hear crackling or glitches "
+            "(at the cost of slightly increased latency).",
+        .type = OptionType::Integer,
+        .setting_name = "16",
+        .category = "Audio",
+    },
     {
         // DelayBy5Seconds
         .title = "Delay by 5 Seconds (DEPRECATED - use -sleepduration instead)",

src/spice2x/launcher/options.h

@@ -201,6 +201,8 @@ namespace launcher {
             AudioDummy,
             DownmixAudioToStereo,
             VolumeBoost,
+            AudioResample,
+            AudioExclusiveBuffer,
             DelayBy5Seconds,
             spice2x_DelayByNSeconds,
             LoadStubs,