From 25b2e07d3ba94fafeab80257ec9f101568a67e7c Mon Sep 17 00:00:00 2001
From: casey langen <casey.langen@gmail.com>
Date: Sun, 2 Jan 2022 13:48:14 -0800
Subject: [PATCH] Added an option to `WasapiOut` to enable its internal
 resampler.

---
 src/plugins/wasapiout/WasapiOut.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/plugins/wasapiout/WasapiOut.cpp b/src/plugins/wasapiout/WasapiOut.cpp
index a308d172b..70c40be43 100644
--- a/src/plugins/wasapiout/WasapiOut.cpp
+++ b/src/plugins/wasapiout/WasapiOut.cpp
@@ -47,6 +47,7 @@
 #define PREF_DEVICE_ID "device_id"
 #define PREF_ENDPOINT_ROUTING "enable_audio_endpoint_routing"
 #define PREF_BUFFER_LENGTH_SECONDS "buffer_length_seconds"
+#define PREF_DISABLE_INTERNAL_RESAMPLER "disable_internal_resampler"
 
 /* NOTE! device init and deinit logic was stolen and modified from
 QMMP's WASAPI output plugin! http://qmmp.ylsoftware.com/ */
@@ -106,6 +107,7 @@ extern "C" __declspec(dllexport) void SetPreferences(musik::core::sdk::IPreferen
     ::prefs = prefs;
     prefs->GetString(PREF_DEVICE_ID, nullptr, 0, "");
     prefs->GetBool(PREF_ENDPOINT_ROUTING, false);
+    prefs->GetBool(PREF_DISABLE_INTERNAL_RESAMPLER, true);
     prefs->Save();
 }
 
@@ -113,6 +115,7 @@ extern "C" __declspec(dllexport) musik::core::sdk::ISchema* GetSchema() {
     auto schema = new TSchema<>();
     schema->AddBool(PREF_ENDPOINT_ROUTING, false);
     schema->AddDouble(PREF_BUFFER_LENGTH_SECONDS, 1.0, 2, 0.25, 5.0);
+    schema->AddBool(PREF_DISABLE_INTERNAL_RESAMPLER, true);
     return schema;
 }
 
@@ -120,6 +123,10 @@ static bool audioRoutingEnabled() {
     return ::prefs && prefs->GetBool(PREF_ENDPOINT_ROUTING, false);
 }
 
+static bool disableInternalResampler() {
+    return ::prefs && prefs->GetBool(PREF_DISABLE_INTERNAL_RESAMPLER, true);
+}
+
 class NotificationClient : public IMMNotificationClient {
     public:
         NotificationClient(WasapiOut* owner)
@@ -519,6 +526,12 @@ found_or_done:
 int WasapiOut::GetDefaultSampleRate() {
     int result = -1;
     Lock lock(this->stateMutex);
+    if (!disableInternalResampler()) {
+        /* if our internal sampler is not disabled, we'll let WASAPI take care of
+        resampling; return -1 here to have audio delivered in its native bitrate,
+        and don't allow decoders to resample. */
+        return -1;
+    }
     this->InitializeAudioClient();
     if (this->audioClient) {
         WAVEFORMATEX* deviceFormat = nullptr;