shithub: zelda3

Download patch

ref: c3a0c733a20c3fddb9f2f8afcf0714eaf2da8643
parent: d5e99ba5bf035d6f454b751d5697c981a33dd4c7
author: Keaton Greve <keatongreve@google.com>
date: Mon Sep 5 23:51:34 EDT 2022 

Create utility functions for Win32 application volume control (#57)

* Create utility functions for Win32 application volume control

* Move files to platform/win32

diff: cannot open b/platform/win32//null: file does not exist: 'b/platform/win32//null' diff: cannot open b/platform//null: file does not exist: 'b/platform//null' 
--- /dev/null
+++ b/platform/win32/volume_control.c
@@ -1,0 +1,87 @@
+#include "volume_control.h"
+
+#define COBJMACROS
+#define CINTERFACE
+
+#define MICROSOFT_WINDOWS_WINBASE_H_DEFINE_INTERLOCKED_CPLUSPLUS_OVERLOADS 0
+
+#include <initguid.h>
+#include <audioclient.h>
+#include <audiopolicy.h>
+#include <mmdeviceapi.h>
+
+HRESULT GetSimpleAudioVolume(ISimpleAudioVolume **simple_audio_volume);
+
+DEFINE_GUID(IID_IMMDeviceEnumerator, 0XA95664D2, 0X9614, 0X4F35, 0XA7, 0X46, 0XDE, 0X8D, 0XB6, 0X36, 0X17, 0XE6);
+DEFINE_GUID(CLSID_MMDeviceEnumerator, 0XBCDE0395, 0XE52F, 0X467C, 0X8E, 0X3D, 0XC4, 0X57, 0X92, 0X91, 0X69, 0X2E);
+DEFINE_GUID(IID_IAudioSessionManager, 0X77AA99A0, 0X1BD6, 0X484F, 0X8B, 0XC7, 0X2C, 0X65, 0X4C, 0X9A, 0X9B, 0X6F);
+
+bool SetApplicationVolume(int volume_level) {
+  ISimpleAudioVolume *simple_audio_volume = NULL;
+  HRESULT result = GetSimpleAudioVolume(&simple_audio_volume);
+  if (FAILED(result) || simple_audio_volume == NULL) {
+    return false;
+  }
+
+  result = ISimpleAudioVolume_SetMasterVolume(simple_audio_volume, (float)(volume_level / 100.0), NULL);
+
+  ISimpleAudioVolume_Release(simple_audio_volume);
+
+  return SUCCEEDED(result);
+}
+
+bool SetApplicationMuted(bool muted) {
+  ISimpleAudioVolume *simple_audio_volume = NULL;
+  HRESULT result = GetSimpleAudioVolume(&simple_audio_volume);
+  if (FAILED(result) || simple_audio_volume == NULL) {
+    return false;
+  }
+
+  result = ISimpleAudioVolume_SetMute(simple_audio_volume, muted, NULL);
+
+  ISimpleAudioVolume_Release(simple_audio_volume);
+
+  return SUCCEEDED(result);
+}
+
+HRESULT GetSimpleAudioVolume(ISimpleAudioVolume **simple_audio_volume) {
+  HRESULT result = S_OK;
+
+  result = CoInitialize(NULL);
+
+  IMMDeviceEnumerator *device_enumerator = NULL;
+  result = CoCreateInstance(&CLSID_MMDeviceEnumerator,
+    NULL, CLSCTX_INPROC_SERVER, &IID_IMMDeviceEnumerator, &device_enumerator);
+
+  if (FAILED(result) || device_enumerator == NULL) {
+    goto done;
+  }
+
+  IMMDevice *device = NULL;
+  result = IMMDeviceEnumerator_GetDefaultAudioEndpoint(device_enumerator, eRender, eConsole, &device);
+
+  if (FAILED(result) || device == NULL) {
+    goto done;
+  }
+
+  IAudioSessionManager *audio_session_manager = NULL;
+  result = IMMDevice_Activate(device, &IID_IAudioSessionManager, CLSCTX_INPROC_SERVER, NULL, &audio_session_manager);
+
+  if (FAILED(result) || audio_session_manager == NULL) {
+    goto done;
+  }
+
+  result = IAudioSessionManager_GetSimpleAudioVolume(audio_session_manager, &GUID_NULL, 0, simple_audio_volume);
+
+done:
+#pragma warning(push)
+#pragma warning(disable: 6001)
+  if (device_enumerator) IMMDeviceEnumerator_Release(device_enumerator);
+  if (device) IMMDevice_Release(device);
+  if (audio_session_manager) IAudioSessionManager_Release(audio_session_manager);
+#pragma warning(pop)
+
+  CoUninitialize();
+
+  return SUCCEEDED(result);
+}
--- /dev/null
+++ b/platform/win32/volume_control.h
@@ -1,0 +1,9 @@
+#ifndef VOLUME_CONTROL_H
+#define VOLUME_CONTROL_H
+
+#include <stdbool.h>
+
+bool SetApplicationVolume(int volume_level);
+bool SetApplicationMuted(bool muted);
+
+#endif // VOLUME_CONTROL_H