service/pipewire: set device node volumes with device object

Fixes discrepancies between pulse and qs volumes, and volumes not
persisting across reboot or vt switches.

src/services/pipewire/device.cpp

@@ -0,0 +1,192 @@
+#include "device.hpp"
+#include <array>
+#include <cstdint>
+#include <functional>
+
+#include <pipewire/device.h>
+#include <qcontainerfwd.h>
+#include <qlogging.h>
+#include <qloggingcategory.h>
+#include <qobject.h>
+#include <qtypes.h>
+#include <spa/param/param.h>
+#include <spa/param/props.h>
+#include <spa/param/route.h>
+#include <spa/pod/builder.h>
+#include <spa/pod/parser.h>
+#include <spa/pod/pod.h>
+#include <spa/pod/vararg.h>
+#include <spa/utils/type.h>
+
+#include "core.hpp"
+
+namespace qs::service::pipewire {
+
+Q_LOGGING_CATEGORY(logDevice, "quickshell.service.pipewire.device", QtWarningMsg);
+
+// https://github.com/PipeWire/wireplumber/blob/895c1c7286e8809fad869059179e53ab39c807e9/modules/module-mixer-api.c#L397
+// https://github.com/PipeWire/pipewire/blob/48c2e9516585ccc791335bc7baf4af6952ec54a0/src/modules/module-protocol-pulse/pulse-server.c#L2743-L2743
+
+void PwDevice::bindHooks() {
+	pw_device_add_listener(this->proxy(), &this->listener.hook, &PwDevice::EVENTS, this);
+	QObject::connect(this->registry->core, &PwCore::polled, this, &PwDevice::polled);
+}
+
+void PwDevice::unbindHooks() {
+	QObject::disconnect(this->registry->core, &PwCore::polled, this, &PwDevice::polled);
+	this->listener.remove();
+	this->stagingIndexes.clear();
+	this->routeDeviceIndexes.clear();
+}
+
+const pw_device_events PwDevice::EVENTS = {
+    .version = PW_VERSION_DEVICE_EVENTS,
+    .info = &PwDevice::onInfo,
+    .param = &PwDevice::onParam,
+};
+
+void PwDevice::onInfo(void* data, const pw_device_info* info) {
+	auto* self = static_cast<PwDevice*>(data);
+
+	if ((info->change_mask & PW_DEVICE_CHANGE_MASK_PARAMS) == PW_DEVICE_CHANGE_MASK_PARAMS) {
+		for (quint32 i = 0; i != info->n_params; i++) {
+			auto& param = info->params[i]; // NOLINT
+
+			if (param.id == SPA_PARAM_Route) {
+				if ((param.flags & SPA_PARAM_INFO_READWRITE) == SPA_PARAM_INFO_READWRITE) {
+					qCDebug(logDevice) << "Enumerating routes param for" << self;
+					self->stagingIndexes.clear();
+					pw_device_enum_params(self->proxy(), 0, param.id, 0, UINT32_MAX, nullptr);
+				} else {
+					qCWarning(logDevice) << "Unable to enumerate route param for" << self
+					                     << "as the param does not have read+write permissions.";
+				}
+
+				break;
+			}
+		}
+	}
+}
+
+void PwDevice::onParam(
+    void* data,
+    qint32 /*seq*/,
+    quint32 id,
+    quint32 /*index*/,
+    quint32 next,
+    const spa_pod* param
+) {
+	auto* self = static_cast<PwDevice*>(data);
+
+	if (id == SPA_PARAM_Route) {
+		self->addDeviceIndexPairs(param);
+	}
+}
+
+void PwDevice::addDeviceIndexPairs(const spa_pod* param) {
+	auto parser = spa_pod_parser();
+	spa_pod_parser_pod(&parser, param);
+
+	qint32 device = 0;
+	qint32 index = 0;
+
+	// clang-format off
+	quint32 id = SPA_PARAM_Route;
+	spa_pod_parser_get_object(
+			&parser, SPA_TYPE_OBJECT_ParamRoute, &id,
+			SPA_PARAM_ROUTE_device, SPA_POD_Int(&device),
+			SPA_PARAM_ROUTE_index, SPA_POD_Int(&index)
+	);
+	// clang-format on
+
+	this->stagingIndexes.insert(device, index);
+	// Insert into the main map as well, staging's purpose is to remove old entries.
+	this->routeDeviceIndexes.insert(device, index);
+
+	qCDebug(logDevice).nospace() << "Registered device/index pair for " << this
+	                             << ": [device: " << device << ", index: " << index << ']';
+}
+
+void PwDevice::polled() {
+	// It is far more likely that the list content has not come in yet than it having no entries,
+	// and there isn't a way to check in the case that there *aren't* actually any entries.
+	if (!this->stagingIndexes.isEmpty() && this->stagingIndexes != this->routeDeviceIndexes) {
+		this->routeDeviceIndexes = this->stagingIndexes;
+		qCDebug(logDevice) << "Updated device/index pair list for" << this << "to"
+		                   << this->routeDeviceIndexes;
+	}
+}
+
+bool PwDevice::setVolumes(qint32 routeDevice, const QVector<float>& volumes) {
+	return this->setRouteProps(routeDevice, [this, routeDevice, &volumes](spa_pod_builder* builder) {
+		auto cubedVolumes = QVector<float>();
+		for (auto volume: volumes) {
+			cubedVolumes.push_back(volume * volume * volume);
+		}
+
+		// clang-format off
+		auto* props = spa_pod_builder_add_object(
+				builder, SPA_TYPE_OBJECT_Props, SPA_PARAM_Props,
+				SPA_PROP_channelVolumes, SPA_POD_Array(sizeof(float), SPA_TYPE_Float, cubedVolumes.length(), cubedVolumes.data())
+		);
+		// clang-format on
+
+		qCInfo(logDevice) << "Changed volumes of" << this << "on route device" << routeDevice << "to"
+		                  << volumes;
+		return props;
+	});
+}
+
+bool PwDevice::setMuted(qint32 routeDevice, bool muted) {
+	return this->setRouteProps(routeDevice, [this, routeDevice, muted](spa_pod_builder* builder) {
+		// clang-format off
+		auto* props = spa_pod_builder_add_object(
+				builder, SPA_TYPE_OBJECT_Props, SPA_PARAM_Props,
+				SPA_PROP_mute, SPA_POD_Bool(muted)
+		);
+		// clang-format on
+
+		qCInfo(logDevice) << "Changed muted state of" << this << "on route device" << routeDevice
+		                  << "to" << muted;
+		return props;
+	});
+}
+
+bool PwDevice::setRouteProps(
+    qint32 routeDevice,
+    const std::function<void*(spa_pod_builder*)>& propsCallback
+) {
+	if (this->proxy() == nullptr) {
+		qCCritical(logDevice) << "Tried to change device route props for" << this
+		                      << "which is not bound.";
+		return false;
+	}
+
+	if (!this->routeDeviceIndexes.contains(routeDevice)) {
+		qCCritical(logDevice) << "Tried to change device route props for" << this
+		                      << "with untracked route device" << routeDevice;
+		return false;
+	}
+
+	auto routeIndex = this->routeDeviceIndexes.value(routeDevice);
+
+	auto buffer = std::array<quint8, 1024>();
+	auto builder = SPA_POD_BUILDER_INIT(buffer.data(), buffer.size());
+
+	auto* props = propsCallback(&builder);
+
+	// clang-format off
+	auto* route = spa_pod_builder_add_object(
+	    &builder, SPA_TYPE_OBJECT_ParamRoute, SPA_PARAM_Route,
+			SPA_PARAM_ROUTE_device, SPA_POD_Int(routeDevice),
+			SPA_PARAM_ROUTE_index, SPA_POD_Int(routeIndex),
+			SPA_PARAM_ROUTE_props, SPA_POD_PodObject(props),
+			SPA_PARAM_ROUTE_save, SPA_POD_Bool(true)
+	);
+	// clang-format on
+
+	pw_device_set_param(this->proxy(), SPA_PARAM_Route, 0, static_cast<spa_pod*>(route));
+	return true;
+}
+
+} // namespace qs::service::pipewire