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70 lines
2 KiB
C++
70 lines
2 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2014-2024 Johannes Pohl
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#pragma once
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// local headers
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#include "pcm_stream.hpp"
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// 3rd party headers
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#include <alsa/asoundlib.h>
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#include <boost/asio/io_context.hpp>
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#include <boost/asio/steady_timer.hpp>
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namespace streamreader
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{
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/// Reads and decodes PCM data from an alsa audio device device
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/**
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* Reads PCM from an alsa audio device device and passes the data to an encoder.
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* Implements EncoderListener to get the encoded data.
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* Data is passed to the PcmStream::Listener
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*/
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class AlsaStream : public PcmStream
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{
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public:
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/// ctor. Encoded PCM data is passed to the PipeListener
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AlsaStream(PcmStream::Listener* pcmListener, boost::asio::io_context& ioc, const ServerSettings& server_settings, const StreamUri& uri);
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void start() override;
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void stop() override;
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protected:
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void do_read();
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void initAlsa();
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void uninitAlsa();
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snd_pcm_t* handle_;
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bool first_;
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std::chrono::time_point<std::chrono::steady_clock> nextTick_;
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boost::asio::steady_timer read_timer_;
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std::string device_;
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std::chrono::microseconds silence_;
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std::string lastException_;
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/// send silent chunks to clients
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bool send_silence_;
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/// silence duration before switching the stream to idle
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std::chrono::milliseconds idle_threshold_;
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};
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} // namespace streamreader
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