1 /*** 2 This file is part of snapcast 3 Copyright (C) 2014-2020 Johannes Pohl 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation, either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. 17 ***/ 18 19 #ifndef ALSA_PLAYER_HPP 20 #define ALSA_PLAYER_HPP 21 22 #include "player.hpp" 23 24 #include <alsa/asoundlib.h> 25 #include <boost/optional.hpp> 26 #include <chrono> 27 28 29 namespace player 30 { 31 32 static constexpr auto ALSA = "alsa"; 33 34 /// Audio Player 35 /** 36 * Audio player implementation using Alsa 37 */ 38 class AlsaPlayer : public Player 39 { 40 public: 41 AlsaPlayer(boost::asio::io_context& io_context, const ClientSettings::Player& settings, std::shared_ptr<Stream> stream); 42 ~AlsaPlayer() override; 43 44 void start() override; 45 void stop() override; 46 47 /// List the system's audio output devices 48 static std::vector<PcmDevice> pcm_list(); 49 50 protected: 51 void worker() override; 52 bool needsThread() const override; 53 54 private: 55 /// initialize alsa and the mixer (if neccessary) 56 void initAlsa(); 57 /// free alsa and optionally the mixer 58 /// @param uninit_mixer free the mixer 59 void uninitAlsa(bool uninit_mixer); 60 bool getAvailDelay(snd_pcm_sframes_t& avail, snd_pcm_sframes_t& delay); 61 62 void initMixer(); 63 void uninitMixer(); 64 65 bool getHardwareVolume(double& volume, bool& muted) override; 66 void setHardwareVolume(double volume, bool muted) override; 67 68 void waitForEvent(); 69 70 snd_pcm_t* handle_; 71 snd_ctl_t* ctl_; 72 73 snd_mixer_t* mixer_; 74 snd_mixer_elem_t* elem_; 75 std::string mixer_name_; 76 std::string mixer_device_; 77 78 std::unique_ptr<pollfd, std::function<void(pollfd*)>> fd_; 79 std::vector<char> buffer_; 80 snd_pcm_uframes_t frames_; 81 boost::asio::posix::stream_descriptor sd_; 82 std::chrono::time_point<std::chrono::steady_clock> last_change_; 83 std::recursive_mutex mutex_; 84 boost::asio::steady_timer timer_; 85 86 boost::optional<std::chrono::microseconds> buffer_time_; 87 boost::optional<uint32_t> periods_; 88 }; 89 90 } // namespace player 91 92 #endif