Switched from sync transcoder to async transcoder

src/libs/av/impl/Transcoder.hpp

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2015 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <filesystem>
+#include <functional>
+
+#include "av/TranscodeParameters.hpp"
+#include "av/Types.hpp"
+
+class IChildProcess;
+
+namespace Av
+{
+	class Transcoder
+	{
+		public:
+			Transcoder(const std::filesystem::path& file, const TranscodeParameters& parameters);
+			~Transcoder();
+
+			Transcoder(const Transcoder&) = delete;
+			Transcoder& operator=(const Transcoder&) = delete;
+			Transcoder(Transcoder&&) = delete;
+			Transcoder& operator=(Transcoder&&) = delete;
+
+			bool			start();
+
+			using WaitCallback = std::function<void()>;
+			void			asyncWaitForData(WaitCallback cb);
+
+			// non blocking calls
+			using ReadCallback = std::function<void(std::size_t nbReadBytes)>;
+			void			asyncRead(std::byte* buffer, std::size_t bufferSize, ReadCallback);
+			std::size_t		readSome(std::byte* buffer, std::size_t bufferSize);
+
+			const std::string&	getOutputMimeType() const { return _outputMimeType; }
+			const TranscodeParameters& getParameters() const { return _parameters; }
+
+			bool			finished() const;
+
+		private:
+			static void init();
+
+			const std::size_t		_id {};
+			const std::filesystem::path	_filePath;
+			const TranscodeParameters	_parameters;
+
+			std::unique_ptr<IChildProcess>	_childProcess;
+
+			bool			_finished {};
+			std::string		_outputMimeType;
+	};
+
+} // namespace Av
+