From 326fa68d9fbd30330805e9557c0603d19269b5f0 Mon Sep 17 00:00:00 2001
From: Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
Date: Fri, 14 Feb 2020 07:30:46 +0100
Subject: [PATCH] obs-signal-handler: Helper classes for signals and audio

---
 CMakeLists.txt                    |  2 +
 source/obs/obs-signal-handler.cpp | 20 +++++++
 source/obs/obs-signal-handler.hpp | 97 +++++++++++++++++++++++++++++++
 3 files changed, 119 insertions(+)
 create mode 100644 source/obs/obs-signal-handler.cpp
 create mode 100644 source/obs/obs-signal-handler.hpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b10435..0965cf2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -421,6 +421,8 @@ set(PROJECT_PRIVATE_SOURCE
 	"${PROJECT_SOURCE_DIR}/source/obs/gs/gs-vertex.cpp"
 	"${PROJECT_SOURCE_DIR}/source/obs/gs/gs-vertexbuffer.hpp"
 	"${PROJECT_SOURCE_DIR}/source/obs/gs/gs-vertexbuffer.cpp"
+	"${PROJECT_SOURCE_DIR}/source/obs/obs-signal-handler.hpp"
+	"${PROJECT_SOURCE_DIR}/source/obs/obs-signal-handler.cpp"
 	"${PROJECT_SOURCE_DIR}/source/obs/obs-source.hpp"
 	"${PROJECT_SOURCE_DIR}/source/obs/obs-source.cpp"
 	"${PROJECT_SOURCE_DIR}/source/obs/obs-source-factory.hpp"
diff --git a/source/obs/obs-signal-handler.cpp b/source/obs/obs-signal-handler.cpp
new file mode 100644
index 0000000..e9faf7a
--- /dev/null
+++ b/source/obs/obs-signal-handler.cpp
@@ -0,0 +1,20 @@
+/*
+ * Modern effects for a modern Streamer
+ * Copyright (C) 2018 Michael Fabian Dirks
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include "obs-signal-handler.hpp"
diff --git a/source/obs/obs-signal-handler.hpp b/source/obs/obs-signal-handler.hpp
new file mode 100644
index 0000000..c7ebd4c
--- /dev/null
+++ b/source/obs/obs-signal-handler.hpp
@@ -0,0 +1,97 @@
+/*
+ * Modern effects for a modern Streamer
+ * Copyright (C) 2020 Michael Fabian Dirks
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#pragma once
+#include <cstdint>
+#include <string>
+#include "util-event.hpp"
+
+#include <obs.h>
+
+namespace obs {
+	template<typename T>
+	class signal_handler_base {
+		protected:
+		std::string _signal;
+
+		public:
+		util::event<T, calldata*> event;
+	};
+
+	template<typename T>
+	class signal_handler : public signal_handler_base<T> {
+		public:
+		signal_handler(std::string signal, T keepalive) {}
+		virtual ~signal_handler() {}
+	};
+
+	template<>
+	class signal_handler<std::shared_ptr<obs_source_t>> : public signal_handler_base<std::shared_ptr<obs_source_t>> {
+		std::shared_ptr<obs_source_t> _keepalive;
+
+		static void handle_signal(void* ptr, calldata* cd) noexcept
+		try {
+			auto p = reinterpret_cast<signal_handler<std::shared_ptr<obs_source_t>>&>(ptr);
+			p.event(p._keepalive, cd);
+		} catch (...) {
+		}
+
+		public:
+		signal_handler(std::string signal, std::shared_ptr<obs_source_t> keepalive) : _keepalive(keepalive)
+		{
+			_signal              = signal;
+			signal_handler_t* sh = obs_source_get_signal_handler(_keepalive.get());
+			signal_handler_connect(sh, _signal.c_str(), handle_signal, this);
+		}
+		virtual ~signal_handler()
+		{
+			event.clear();
+			signal_handler_t* sh = obs_source_get_signal_handler(_keepalive.get());
+			signal_handler_disconnect(sh, _signal.c_str(), handle_signal, this);
+		}
+	};
+
+	typedef signal_handler<std::shared_ptr<obs_source_t>> source_signal_handler;
+
+	// Audio Capture is also here, as it could be considered a signal.
+	class audio_signal_handler {
+		std::shared_ptr<obs_source_t> _keepalive;
+
+		static void handle_audio(void* ptr, obs_source_t*, const struct audio_data* audio_data, bool muted) noexcept
+		try {
+			auto p = reinterpret_cast<audio_signal_handler&>(ptr);
+			p.event(p._keepalive, audio_data, muted);
+		} catch (...) {
+		}
+
+		public:
+		audio_signal_handler(std::shared_ptr<obs_source_t> keepalive) : _keepalive(keepalive), event()
+		{
+			obs_source_add_audio_capture_callback(_keepalive.get(), handle_audio, this);
+		}
+		virtual ~audio_signal_handler()
+		{
+			event.clear();
+			obs_source_remove_audio_capture_callback(_keepalive.get(), handle_audio, this);
+		}
+
+		util::event<std::shared_ptr<obs_source_t>, const struct audio_data*, bool> event;
+	};
+
+} // namespace obs