d7samurai · August 29, 2025 12:13 · Mar 2, 2024 · Jun 23, 2023 · Apr 26, 2023 · Apr 26, 2023
diff --git a/code.cpp b/code.cpp
@@ -43,13 +43,7 @@ int main()
 
     audioClient->GetMixFormat(&mixFormat);
 
-    WAVEFORMATEXTENSIBLE mixFormatEx;
-
-    memcpy(&mixFormatEx, mixFormat, sizeof(mixFormatEx));
-
-    CoTaskMemFree(mixFormat);
-
-    audioClient->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_EVENTCALLBACK, minimumPeriod, 0, reinterpret_cast<WAVEFORMATEX*>(&mixFormatEx), nullptr);
+    audioClient->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_EVENTCALLBACK, minimumPeriod, 0, mixFormat, nullptr);
 
     IAudioRenderClient* audioRenderClient;
 

diff --git a/.readme.md b/.readme.md
@@ -1,4 +1,4 @@
 # Minimal WASAPI
 Minimal WASAPI reference implementation. Runnable console application contained in a single function and laid out in a linear, step-by-step fashion. No modern C++ / OOP / obscuring cruft. Produces a steady sine wave sound.
 
-(This is a re-post of the same gist I posted a few years earlier, since it's not possible to hide or rearrange gists).
+(This is a re-post of the same gist I posted a few years earlier, simply due to me wanting the Minimal D3D11 series to be listed contiguously and it's not possible to hide or rearrange gists).
diff --git a/.readme.md b/.readme.md
@@ -1,4 +1,4 @@
 # Minimal WASAPI
 Minimal WASAPI reference implementation. Runnable console application contained in a single function and laid out in a linear, step-by-step fashion. No modern C++ / OOP / obscuring cruft. Produces a steady sine wave sound.
 
-(This is a re-post of the same gist I posted a few years earlier, since it's not possible to hide or re-arrange gists).
+(This is a re-post of the same gist I posted a few years earlier, since it's not possible to hide or rearrange gists).
diff --git a/.readme.md b/.readme.md
@@ -1,4 +1,4 @@
 # Minimal WASAPI
 Minimal WASAPI reference implementation. Runnable console application contained in a single function and laid out in a linear, step-by-step fashion. No modern C++ / OOP / obscuring cruft. Produces a steady sine wave sound.
 
-(This is a re-post of the same gist I posted a few years earlier, since it's not possible to hide or re-arrange the order of gists).
+(This is a re-post of the same gist I posted a few years earlier, since it's not possible to hide or re-arrange gists).
diff --git a/.readme.md b/.readme.md
@@ -1,2 +1,4 @@
 # Minimal WASAPI
-Minimal WASAPI reference implementation. Runnable console application contained in a single function and laid out in a linear, step-by-step fashion. No modern C++ / OOP / obscuring cruft. Produces a steady sine wave sound.
+Minimal WASAPI reference implementation. Runnable console application contained in a single function and laid out in a linear, step-by-step fashion. No modern C++ / OOP / obscuring cruft. Produces a steady sine wave sound.
+
+(This is a re-post of the same gist I posted a few years earlier, since it's not possible to hide or re-arrange the order of gists).
diff --git a/.readme.md b/.readme.md
@@ -0,0 +1,2 @@
+# Minimal WASAPI
+Minimal WASAPI reference implementation. Runnable console application contained in a single function and laid out in a linear, step-by-step fashion. No modern C++ / OOP / obscuring cruft. Produces a steady sine wave sound.
diff --git a/code.cpp b/code.cpp
@@ -0,0 +1,101 @@
+
+#pragma comment(lib, "ole32")
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#include <windows.h>
+#include <mmdeviceapi.h>
+#include <audioclient.h>
+#include <math.h> // for sine
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+int main()
+{
+    CoInitializeEx(nullptr, COINIT_MULTITHREADED | COINIT_DISABLE_OLE1DDE);
+
+    ///////////////////////////////////////////////////////////////////////////////////////////////
+
+    IMMDeviceEnumerator* deviceEnumerator;
+
+    CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_INPROC_SERVER, __uuidof(IMMDeviceEnumerator), reinterpret_cast<void**>(&deviceEnumerator));
+
+    ///////////////////////////////////////////////////////////////////////////////////////////////
+
+    IMMDevice* audioDevice;
+
+    deviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &audioDevice);
+
+    ///////////////////////////////////////////////////////////////////////////////////////////////
+
+    IAudioClient3* audioClient;
+
+    audioDevice->Activate(__uuidof(IAudioClient3), CLSCTX_INPROC_SERVER, nullptr, reinterpret_cast<void**>(&audioClient));
+
+    ///////////////////////////////////////////////////////////////////////////////////////////////
+
+    REFERENCE_TIME defaultPeriod;
+    REFERENCE_TIME minimumPeriod;
+
+    audioClient->GetDevicePeriod(&defaultPeriod, &minimumPeriod);
+
+    WAVEFORMATEX* mixFormat;
+
+    audioClient->GetMixFormat(&mixFormat);
+
+    WAVEFORMATEXTENSIBLE mixFormatEx;
+
+    memcpy(&mixFormatEx, mixFormat, sizeof(mixFormatEx));
+
+    CoTaskMemFree(mixFormat);
+
+    audioClient->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_EVENTCALLBACK, minimumPeriod, 0, reinterpret_cast<WAVEFORMATEX*>(&mixFormatEx), nullptr);
+
+    IAudioRenderClient* audioRenderClient;
+
+    audioClient->GetService(__uuidof(IAudioRenderClient), reinterpret_cast<void**>(&audioRenderClient));
+
+    UINT32 bufferSize;
+
+    audioClient->GetBufferSize(&bufferSize);
+
+    HANDLE bufferReady = CreateEventA(nullptr, FALSE, FALSE, nullptr);
+
+    audioClient->SetEventHandle(bufferReady);
+
+    ///////////////////////////////////////////////////////////////////////////////////////////////
+
+    double time = 0.0;
+
+    audioClient->Start();
+
+    while (WaitForSingleObject(bufferReady, INFINITE) == WAIT_OBJECT_0)
+    {
+        UINT32 bufferPadding;
+
+        audioClient->GetCurrentPadding(&bufferPadding);
+
+        UINT32 frameCount = bufferSize - bufferPadding;
+        float* buffer;
+
+        audioRenderClient->GetBuffer(frameCount, reinterpret_cast<BYTE**>(&buffer));
+
+        for (UINT32 frameIndex = 0; frameIndex < frameCount; frameIndex++)
+        {
+            float amplitude = static_cast<float>(sin(time));
+
+            *buffer++ = amplitude; // left
+            *buffer++ = amplitude; // right
+
+            time += 0.05;
+        }
+
+        audioRenderClient->ReleaseBuffer(frameCount, 0);
+    }
+
+    audioClient->Stop();
+
+    ///////////////////////////////////////////////////////////////////////////////////////////////
+
+    return 0;
+}
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		# Minimal WASAPI
		Minimal WASAPI reference implementation. Runnable console application contained in a single function and laid out in a linear, step-by-step fashion. No modern C++ / OOP / obscuring cruft. Produces a steady sine wave sound.