win-wasapi: Add microphone volume adjustment feature

hongqingwan · hongqingwan · commit fb53304fe037 · 2025-10-30T19:08:27.000+08:00
diff --git a/plugins/win-wasapi/enum-wasapi.cpp b/plugins/win-wasapi/enum-wasapi.cpp
@@ -1,6 +1,7 @@
 #include "enum-wasapi.hpp"
 
 #include <util/base.h>
+#include <util/dstr.h>
 #include <util/platform.h>
 #include <util/windows/HRError.hpp>
 #include <util/windows/ComPtr.hpp>
@@ -90,3 +91,35 @@ void GetWASAPIAudioDevices(vector<AudioDeviceInfo> &devices, bool input)
 		blog(LOG_WARNING, "[GetWASAPIAudioDevices] %s: %lX", error.str, error.hr);
 	}
 }
+
+IMMDevice *GetMMDeviceById(bool isDefaultDevice, const std::string &device_id, bool input)
+{
+	ComPtr<IMMDeviceEnumerator> enumerator;
+	ComPtr<IMMDevice> device;
+
+	HRESULT res = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_ALL, __uuidof(IMMDeviceEnumerator),
+				       (void **)enumerator.Assign());
+	if (FAILED(res))
+		return nullptr;
+
+	if (isDefaultDevice) {
+		HRESULT res = enumerator->GetDefaultAudioEndpoint(input ? eCapture : eRender,
+								  input ? eCommunications : eConsole, device.Assign());
+		if (FAILED(res))
+			return nullptr;
+	} else {
+		wchar_t *w_id;
+		os_utf8_to_wcs_ptr(device_id.c_str(), device_id.size(), &w_id);
+		if (!w_id)
+			throw "Failed to widen device id string";
+
+		const HRESULT res = enumerator->GetDevice(w_id, device.Assign());
+
+		bfree(w_id);
+
+		if (FAILED(res))
+			return nullptr;
+	}
+
+	return device.Detach();
+}
diff --git a/plugins/win-wasapi/enum-wasapi.hpp b/plugins/win-wasapi/enum-wasapi.hpp
@@ -39,3 +39,4 @@ struct AudioDeviceInfo {
 
 std::string GetDeviceName(IMMDevice *device);
 void GetWASAPIAudioDevices(std::vector<AudioDeviceInfo> &devices, bool input);
+IMMDevice *GetMMDeviceById(bool isDefaultDevice, const std::string &device_id, bool input);
diff --git a/plugins/win-wasapi/win-wasapi.cpp b/plugins/win-wasapi/win-wasapi.cpp
@@ -21,6 +21,7 @@
 #include <avrt.h>
 #include <RTWorkQ.h>
 #include <wrl/implements.h>
+#include <devicetopology.h>
 
 using namespace std;
 
@@ -289,6 +290,13 @@ class WASAPISource {
 		obs_weak_source_release(reroute_target);
 		reroute_target = obs_source_get_weak_source(target);
 	}
+
+	static void DeviceTopologyTraversal(IMMDevice *device, obs_properties_t *props, obs_data_t *settings,
+					    bool modifyBySettins);
+	static void DeviceTopologyTraversal(IConnector *connect, obs_properties_t *props, obs_data_t *settings,
+					    bool modifyBySettins);
+	static void DeviceTopologyTraversal(IPart *part, obs_properties_t *props, obs_data_t *settings,
+					    bool modifyBySettins);
 };
 
 WASAPISource::WASAPISource(obs_data_t *settings, obs_source_t *source_, SourceType type)
@@ -546,6 +554,12 @@ void WASAPISource::Update(obs_data_t *settings)
 
 	if (restart)
 		SetEvent(restartSignal);
+
+	IMMDevice *device = GetMMDeviceById(params.isDefaultDevice, params.device_id, sourceType == SourceType::Input);
+	WASAPISource::DeviceTopologyTraversal(device, nullptr, settings, true);
+	if (device) {
+		device->Release();
+	}
 }
 
 void WASAPISource::OnWindowChanged(obs_data_t *settings)
@@ -630,6 +644,201 @@ static DWORD GetSpeakerChannelMask(speaker_layout layout)
 	return (DWORD)layout;
 }
 
+void WASAPISource::DeviceTopologyTraversal(IPart *part, obs_properties_t *props, obs_data_t *settings,
+					   bool modifyBySettins)
+{
+	if (part == nullptr) {
+		return;
+	}
+	IPartsList *partList = nullptr;
+	part->EnumPartsOutgoing(&partList);
+	if (partList == nullptr) {
+		return;
+	}
+	IPart *pPartNext = NULL;
+	partList->GetPart(0, &pPartNext);
+	if (pPartNext == nullptr) {
+		partList->Release();
+		return;
+	}
+	PartType partType;
+	HRESULT hr = pPartNext->GetPartType(&partType);
+	if (FAILED(hr)) {
+		partList->Release();
+		pPartNext->Release();
+		return;
+	}
+
+	if (partType == PartType::Subunit) {
+		IKsJackDescription **Jack = nullptr;
+		hr = pPartNext->Activate(CLSCTX_INPROC_SERVER, __uuidof(IKsJackDescription), (void **)&Jack);
+		GUID SubType = {};
+		pPartNext->GetSubType(&SubType);
+		LPWSTR name = nullptr;
+		pPartNext->GetName(&name);
+		if (SubType == KSNODETYPE_LOUDNESS) {
+			// TODO
+		} else if (SubType == KSNODETYPE_ADC) {
+			// TODO
+		} else if (SubType == KSNODETYPE_VOLUME) {
+			IAudioVolumeLevel *audioVolumeLevel = nullptr;
+			pPartNext->Activate(CLSCTX_ALL, __uuidof(IAudioVolumeLevel), (void **)&audioVolumeLevel);
+			if (audioVolumeLevel) {
+				float pfMinLevelDB = 0.0f;
+				float pfMaxLevelDB = 0.0f;
+				float pfStepping = 0.0f;
+				hr = audioVolumeLevel->GetLevelRange(0, &pfMinLevelDB, &pfMaxLevelDB, &pfStepping);
+				if (SUCCEEDED(hr)) {
+					size_t len = wcslen(name);
+					size_t size = os_wcs_to_utf8(name, len, nullptr, 0) + 1;
+					std::string utf8_name;
+					utf8_name.resize(size);
+					os_wcs_to_utf8(name, len, &utf8_name[0], size);
+					if (modifyBySettins) {
+						float pfLevelDB =
+							(float)obs_data_get_double(settings, utf8_name.c_str());
+						audioVolumeLevel->SetLevel(0, pfLevelDB, nullptr);
+					} else {
+						float pfLevelDB = 0.0f;
+						audioVolumeLevel->GetLevel(0, &pfLevelDB);
+						obs_property_t *p = obs_properties_add_float_slider(
+							props, utf8_name.c_str(), utf8_name.c_str(), pfMinLevelDB,
+							pfMaxLevelDB, pfStepping);
+						obs_data_set_double(settings, utf8_name.c_str(), pfLevelDB);
+					}
+				}
+				audioVolumeLevel->Release();
+			}
+		} else if (SubType == KSNODETYPE_MUTE) {
+			IAudioMute *audioMute = nullptr;
+			pPartNext->Activate(CLSCTX_ALL, __uuidof(IAudioMute), (void **)&audioMute);
+			if (audioMute != nullptr) {
+				size_t len = wcslen(name);
+				size_t size = os_wcs_to_utf8(name, len, nullptr, 0) + 1;
+				std::string utf8_name;
+				utf8_name.resize(size);
+				os_wcs_to_utf8(name, len, &utf8_name[0], size);
+				if (modifyBySettins) {
+					bool mute = obs_data_get_bool(settings, utf8_name.c_str());
+					audioMute->SetMute(mute, nullptr);
+				} else {
+					obs_property_t *p =
+						obs_properties_add_bool(props, utf8_name.c_str(), utf8_name.c_str());
+					BOOL isMute = FALSE;
+					audioMute->GetMute(&isMute);
+					obs_data_set_bool(settings, utf8_name.c_str(), !!isMute);
+				}
+				audioMute->Release();
+			}
+		} else if (SubType == KSNODETYPE_AGC) {
+			IAudioAutoGainControl *audioAutoGainControl = nullptr;
+			pPartNext->Activate(CLSCTX_ALL, __uuidof(IAudioAutoGainControl),
+					    (void **)&audioAutoGainControl);
+
+			if (audioAutoGainControl != nullptr) {
+				size_t len = wcslen(name);
+				size_t size = os_wcs_to_utf8(name, len, nullptr, 0) + 1;
+				std::string utf8_name;
+				utf8_name.resize(size);
+				os_wcs_to_utf8(name, len, &utf8_name[0], size);
+				if (modifyBySettins) {
+					bool enable = obs_data_get_bool(settings, utf8_name.c_str());
+					audioAutoGainControl->SetEnabled(enable, nullptr);
+				} else {
+					obs_property_t *p =
+						obs_properties_add_bool(props, utf8_name.c_str(), utf8_name.c_str());
+					BOOL isEnabled = FALSE;
+					audioAutoGainControl->GetEnabled(&isEnabled);
+					obs_data_set_bool(settings, utf8_name.c_str(), !!isEnabled);
+				}
+				audioAutoGainControl->Release();
+			}
+		} else if (SubType == KSNODETYPE_TONE) {
+			// TODO
+		}
+
+		if (!name) {
+			CoTaskMemFree(name);
+		}
+
+		DeviceTopologyTraversal(pPartNext, props, settings, modifyBySettins);
+		pPartNext->Release();
+	}
+
+	if (partType == PartType::Connector) {
+		IConnector *connect = nullptr;
+		hr = pPartNext->QueryInterface(__uuidof(IConnector), (void **)&connect);
+		DeviceTopologyTraversal(connect, props, settings, modifyBySettins);
+	}
+}
+
+void WASAPISource::DeviceTopologyTraversal(IConnector *connect, obs_properties_t *props, obs_data_t *settings,
+					   bool modifyBySettins)
+{
+	if (connect == nullptr) {
+		return;
+	}
+
+	BOOL IsConnected = FALSE;
+	HRESULT hr = connect->IsConnected(&IsConnected);
+	if (FAILED(hr)) {
+		return;
+	}
+
+	if (IsConnected == FALSE) {
+		ConnectorType connType;
+		hr = connect->GetType(&connType);
+
+		if (FAILED(hr)) {
+			return;
+		}
+		if (connType == Software_IO) {
+			return;
+		}
+	}
+
+	IConnector *connectedTo = nullptr;
+	hr = connect->GetConnectedTo(&connectedTo);
+	if (FAILED(hr) || connectedTo == nullptr) {
+		return;
+	}
+
+	IPart *Part = nullptr;
+
+	connectedTo->QueryInterface(__uuidof(IPart), (void **)&Part);
+	DeviceTopologyTraversal(Part, props, settings, modifyBySettins);
+	if (Part != nullptr) {
+		Part->Release();
+	}
+
+	connectedTo->Release();
+}
+
+void WASAPISource::DeviceTopologyTraversal(IMMDevice *device, obs_properties_t *props, obs_data_t *settings,
+					   bool modifyBySettins)
+{
+	if (device == nullptr) {
+		return;
+	}
+	IDeviceTopology *pDeviceTopology = nullptr;
+	HRESULT hr = device->Activate(__uuidof(IDeviceTopology), CLSCTX_ALL, nullptr, (void **)&pDeviceTopology);
+	if (FAILED(hr))
+		return;
+	UINT nConnectorCount = 0;
+	hr = pDeviceTopology->GetConnectorCount(&nConnectorCount);
+	if (FAILED(hr))
+		return;
+	for (UINT i = 0; i < nConnectorCount; i++) {
+		IConnector *pConnector = nullptr;
+		pDeviceTopology->GetConnector(i, &pConnector);
+		DeviceTopologyTraversal(pConnector, props, settings, modifyBySettins);
+		if (pConnector) {
+			pConnector->Release();
+		}
+	}
+	pDeviceTopology->Release();
+}
+
 ComPtr<IAudioClient> WASAPISource::InitClient(IMMDevice *device, SourceType type, DWORD process_id,
 					      PFN_ActivateAudioInterfaceAsync activate_audio_interface_async,
 					      speaker_layout &speakers, audio_format &format, uint32_t &samples_per_sec)
@@ -707,6 +916,7 @@ ComPtr<IAudioClient> WASAPISource::InitClient(IMMDevice *device, SourceType type
 	DWORD flags = AUDCLNT_STREAMFLAGS_EVENTCALLBACK;
 	if (type != SourceType::Input)
 		flags |= AUDCLNT_STREAMFLAGS_LOOPBACK;
+
 	res = client->Initialize(AUDCLNT_SHAREMODE_SHARED, flags, BUFFER_TIME_100NS, 0, pFormat, nullptr);
 	if (FAILED(res))
 		throw HRError("Failed to initialize audio client", res);
@@ -1454,8 +1664,29 @@ static bool UpdateWASAPIMethod(obs_properties_t *props, obs_property_t *, obs_da
 	return true;
 }
 
-static obs_properties_t *GetWASAPIPropertiesInput(void *)
+static bool DeviceSelectionChanged(obs_properties_t *props, obs_property_t *p, obs_data_t *settings)
 {
+	string id = obs_data_get_string(settings, OPT_DEVICE_ID);
+	obs_property_t *property = obs_properties_first(props);
+
+	while (property) {
+		std::string name = obs_property_name(property);
+		obs_property_next(&property);
+		if (name != OPT_DEVICE_ID && name != OPT_USE_DEVICE_TIMING) {
+			obs_properties_remove_by_name(props, name.c_str());
+		}
+	}
+	IMMDevice *device = GetMMDeviceById(id == "default" ? true : false, id, true);
+	WASAPISource::DeviceTopologyTraversal(device, props, settings, false);
+	if (device) {
+		device->Release();
+	}
+	return true;
+}
+
+static obs_properties_t *GetWASAPIPropertiesInput(void *data)
+{
+	WASAPISource *source = (WASAPISource *)data;
 	obs_properties_t *props = obs_properties_create();
 	vector<AudioDeviceInfo> devices;
 
@@ -1473,7 +1704,7 @@ static obs_properties_t *GetWASAPIPropertiesInput(void *)
 	}
 
 	obs_properties_add_bool(props, OPT_USE_DEVICE_TIMING, obs_module_text("UseDeviceTiming"));
-
+	obs_property_set_modified_callback(device_prop, DeviceSelectionChanged);
 	return props;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -39,3 +39,4 @@ struct AudioDeviceInfo {`
`39`	`39`
`40`	`40`	`std::string GetDeviceName(IMMDevice *device);`
`41`	`41`	`void GetWASAPIAudioDevices(std::vector<AudioDeviceInfo> &devices, bool input);`
	`42`	`+IMMDevice *GetMMDeviceById(bool isDefaultDevice, const std::string &device_id, bool input);`