First implementation of JackStream

server/streamreader/jack_stream.hpp

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+/***
+    This file is part of snapcast
+    Copyright (C) 2014-2024  Johannes Pohl
+
+    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 3 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, see <http://www.gnu.org/licenses/>.
+***/
+
+#pragma once
+
+#include <jack/jack.h>
+
+// local headers
+#include "pcm_stream.hpp"
+#include <server/server_settings.hpp>
+
+// 3rd party headers
+#include <boost/asio/spawn.hpp>
+#include <boost/asio/io_context.hpp>
+#include <boost/asio/steady_timer.hpp>
+
+
+namespace streamreader
+{
+
+
+/// Reads and decodes PCM data from a Jack server
+/**
+ * Reads PCM from a Jack server and passes the data to an encoder.
+ * Implements EncoderListener to get the encoded data.
+ * Data is passed to the PcmStream::Listener
+ */
+class JackStream : public PcmStream
+{
+public:
+    /// ctor. Encoded PCM data is passed to the PipeListener
+    JackStream(PcmStream::Listener* pcmListener, boost::asio::io_context& ioc, const ServerSettings& server_settings, const StreamUri& uri);
+
+    void start() override;
+    void stop() override;
+
+protected:
+    bool openJackConnection();
+    void closeJackConnection();
+    bool createJackPorts();
+    void tryConnect();
+    int readJackBuffers(jack_nframes_t nframes);
+
+    void onJackPortRegistration(jack_port_id_t port_id, int registered);
+    void onJackShutdown();
+
+    void autoConnectPorts();
+
+    jack_client_t *client_;
+    jack_status_t status_;
+    std::vector<jack_port_t *> ports_;
+    jack_nframes_t jackConnectFrames_;
+    std::chrono::time_point<std::chrono::steady_clock> jackConnectTime_;
+    jack_time_t jackTimeAdjust_;
+    SampleFormat jackSampleFormat_;
+
+    std::string autoConnectRegex_;
+    bool doAutoConnect_ = false;
+    int autoConnectSkip_;
+
+    void (*interleave_func_)(char *, jack_default_audio_sample_t *, unsigned long, unsigned long);
+
+    bool first_;
+    std::chrono::time_point<std::chrono::steady_clock> nextTick_;
+    boost::asio::steady_timer read_timer_;
+    std::chrono::microseconds silence_;
+    std::string lastException_;
+
+    /// send silent chunks to clients
+    bool send_silence_;
+    /// silence duration before switching the stream to idle
+    std::chrono::milliseconds idle_threshold_;
+
+    static int processCallback(jack_nframes_t nframes, void* arg);
+    static void jackShutdown(void* arg);
+    static void jackErrorMessage(const char* msg);
+    static void jackInfoMessage(const char* msg);
+    static void jackPortConnect(jack_port_id_t a, jack_port_id_t b, int connect, void* arg);
+    static void jackPortRegistration(jack_port_id_t port_id, int registered, void* arg);
+};
+
+} // namespace streamreader
+