Add abstract AsioStream class

2025-05-10 23:56:43 +02:00 · 2019-11-27 20:44:34 +01:00 · 2019-11-27 20:44:34 +01:00 · 48e76ea58d
commit 48e76ea58d
parent b00ee4aaf8
5 changed files with 168 additions and 180 deletions
--- a/server/streamreader/asio_stream.hpp
+++ b/server/streamreader/asio_stream.hpp
@ -0,0 +1,144 @@
+/***
+    This file is part of snapcast
+    Copyright (C) 2014-2019  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/>.
+***/
+
+#ifndef ASIO_STREAM_HPP
+#define ASIO_STREAM_HPP
+
+#include "pcm_stream.hpp"
+#include <boost/asio.hpp>
+
+
+template <typename ReadStream>
+class AsioStream : public PcmStream, public std::enable_shared_from_this<AsioStream<ReadStream>>
+{
+public:
+    /// ctor. Encoded PCM data is passed to the PipeListener
+    AsioStream(PcmListener* pcmListener, boost::asio::io_context& ioc, const StreamUri& uri);
+
+    void start() override;
+    void stop() override;
+
+protected:
+    virtual void connect() = 0;
+    virtual void disconnect() = 0;
+    virtual void on_connect();
+    virtual void do_read();
+    std::unique_ptr<msg::PcmChunk> chunk_;
+    timeval tv_chunk_;
+    bool first_;
+    long nextTick_;
+    boost::asio::deadline_timer timer_;
+    std::unique_ptr<ReadStream> stream_;
+};
+
+
+
+template <typename ReadStream>
+AsioStream<ReadStream>::AsioStream(PcmListener* pcmListener, boost::asio::io_context& ioc, const StreamUri& uri) : PcmStream(pcmListener, ioc, uri), timer_(ioc)
+{
+    chunk_ = std::make_unique<msg::PcmChunk>(sampleFormat_, pcmReadMs_);
+}
+
+
+template <typename ReadStream>
+void AsioStream<ReadStream>::start()
+{
+    encoder_->init(this, sampleFormat_);
+    connect();
+}
+
+
+template <typename ReadStream>
+void AsioStream<ReadStream>::stop()
+{
+    timer_.cancel();
+    disconnect();
+}
+
+
+template <typename ReadStream>
+void AsioStream<ReadStream>::on_connect()
+{
+    chronos::systemtimeofday(&tv_chunk_);
+    tvEncodedChunk_ = tv_chunk_;
+    nextTick_ = chronos::getTickCount();
+    first_ = true;
+    do_read();
+}
+
+
+template <typename ReadStream>
+void AsioStream<ReadStream>::do_read()
+{
+    // LOG(DEBUG) << "do_read\n";
+    auto self = this->shared_from_this();
+    chunk_->timestamp.sec = tv_chunk_.tv_sec;
+    chunk_->timestamp.usec = tv_chunk_.tv_usec;
+    boost::asio::async_read(*stream_, boost::asio::buffer(chunk_->payload, chunk_->payloadSize),
+                            [this, self](boost::system::error_code ec, std::size_t length) mutable {
+                                if (ec)
+                                {
+                                    LOG(ERROR) << "Error reading message: " << ec.message() << ", length: " << length << "\n";
+                                    connect();
+                                    return;
+                                }
+                                // LOG(DEBUG) << "Read: " << length << " bytes\n";
+                                if (first_)
+                                {
+                                    first_ = false;
+                                    chronos::systemtimeofday(&tv_chunk_);
+                                    chunk_->timestamp.sec = tv_chunk_.tv_sec;
+                                    chunk_->timestamp.usec = tv_chunk_.tv_usec;
+                                    tvEncodedChunk_ = tv_chunk_;
+                                    nextTick_ = chronos::getTickCount();
+                                }
+                                encoder_->encode(chunk_.get());
+                                nextTick_ += pcmReadMs_;
+                                chronos::addUs(tv_chunk_, pcmReadMs_ * 1000);
+                                long currentTick = chronos::getTickCount();
+
+                                if (nextTick_ >= currentTick)
+                                {
+                                    setState(kPlaying);
+                                    timer_.expires_from_now(boost::posix_time::milliseconds(nextTick_ - currentTick));
+                                    timer_.async_wait([self, this](const boost::system::error_code& ec) {
+                                        if (ec)
+                                        {
+                                            LOG(ERROR) << "Error during async wait: " << ec.message() << "\n";
+                                        }
+                                        else
+                                        {
+                                            do_read();
+                                        }
+                                    });
+                                    return;
+                                }
+                                else
+                                {
+                                    chronos::systemtimeofday(&tv_chunk_);
+                                    tvEncodedChunk_ = tv_chunk_;
+                                    pcmListener_->onResync(this, currentTick - nextTick_);
+                                    nextTick_ = currentTick;
+                                    do_read();
+                                }
+                            });
+}
+
+
+
+#endif