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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
// local headers
#include "pcm_stream.hpp"
// 3rd party headers
#include <alsa/asoundlib.h>
#include <boost/asio/io_context.hpp>
#include <boost/asio/steady_timer.hpp>
namespace streamreader
{
/// Reads and decodes PCM data from an alsa audio device device
/**
* Reads PCM from an alsa audio device device and passes the data to an encoder.
* Implements EncoderListener to get the encoded data.
* Data is passed to the PcmStream::Listener
*/
class AlsaStream : public PcmStream
{
public:
/// ctor. Encoded PCM data is passed to the PipeListener
AlsaStream(PcmStream::Listener* pcmListener, boost::asio::io_context& ioc, const ServerSettings& server_settings, const StreamUri& uri);
void start() override;
void stop() override;
protected:
void do_read();
void initAlsa();
void uninitAlsa();
snd_pcm_t* handle_;
bool first_;
std::chrono::time_point<std::chrono::steady_clock> nextTick_;
boost::asio::steady_timer read_timer_;
std::string device_;
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_;
};
} // namespace streamreader
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