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https://github.com/badaix/snapcast.git
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95 lines
2.5 KiB
C++
95 lines
2.5 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 "player.hpp"
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// 3rd party headers
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#include <alsa/asoundlib.h>
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#include <boost/asio/posix/stream_descriptor.hpp>
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#include <boost/asio/steady_timer.hpp>
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// standard headers
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#include <chrono>
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#include <optional>
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#include <vector>
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namespace player
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{
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static constexpr auto ALSA = "alsa";
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/// Audio Player
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/**
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* Audio player implementation using Alsa
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*/
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class AlsaPlayer : public Player
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{
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public:
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AlsaPlayer(boost::asio::io_context& io_context, const ClientSettings::Player& settings, std::shared_ptr<Stream> stream);
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~AlsaPlayer() override;
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void start() override;
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void stop() override;
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/// List the system's audio output devices
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static std::vector<PcmDevice> pcm_list();
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protected:
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void worker() override;
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bool needsThread() const override;
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private:
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/// initialize alsa and the mixer (if neccessary)
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void initAlsa();
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/// free alsa and optionally the mixer
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/// @param uninit_mixer free the mixer
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void uninitAlsa(bool uninit_mixer);
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bool getAvailDelay(snd_pcm_sframes_t& avail, snd_pcm_sframes_t& delay);
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void initMixer();
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void uninitMixer();
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bool getHardwareVolume(Volume& volume) override;
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void setHardwareVolume(const Volume& volume) override;
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void waitForEvent();
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snd_pcm_t* handle_;
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snd_ctl_t* ctl_;
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snd_mixer_t* mixer_;
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snd_mixer_elem_t* elem_;
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std::string mixer_name_;
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std::string mixer_device_;
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std::unique_ptr<pollfd, std::function<void(pollfd*)>> fd_;
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std::vector<char> buffer_;
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snd_pcm_uframes_t frames_;
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boost::asio::posix::stream_descriptor sd_;
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std::chrono::time_point<std::chrono::steady_clock> last_change_;
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boost::asio::steady_timer timer_;
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std::optional<std::chrono::microseconds> buffer_time_;
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std::optional<uint32_t> periods_;
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};
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} // namespace player
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