2021年9月更新：
Pipewire是红帽造的新一代音视频轮子，主要是用来取代PulseAudio、jack还有gstreams什么的。据说 延迟补偿还不错，据说 能统一音视频框架还兼容PulseAudio和Jack，据说是朝着专业级音效去的。据说支持Wayland和平板，据说支持Flatpak之类的容器内使用，据说有类似PolKit的权限管理，不需要像PulseAudio那样新建音频用户组和添加用户了。。。。
It provides a low-latency, graph based processing engine on top of audio and video devices that can be used to support the use cases currently handled by both pulseaudio and JACK. PipeWire was designed with a powerful security model that makes interacting with audio and video devices from containerized applications easy, with supporting Flatpak applications being the primary goal. Alongside Wayland and Flatpak we expect PipeWire to provide a core building block for the future of Linux application development.
都是据说啊，被Wayland骗了一次之后我已经不敢信这些宣传了，先试试实际效果再说。
当然这个目前貌似只正经适配了GNOME和Fedora，不过据说兼容PulseAudio，Arch上的坑已经有人踩了好久了，现在还有点小问题，不过可以考虑上了。
安装 要替代PulseAudio和Jack装这两个包pipewire-pulse、pipewire-jack-dropin。
1 yay -S pipewire-jack-dropin pipewire-pulse
然后systemd设置一下（archwiki说蓝牙设备需要手动设置一下，编辑/etc/pipewire/pipewire.conf，我手头没蓝牙耳机就不弄了）
1 systemctl enable --user pipewire-pulse
然后退出登录或重启。
运行pactl info，如果看到
1 Server Name: PulseAudio (on PipeWire 0.3.17)
说明正常。
蓝牙设备 感谢室友赞助的一个索尼蓝牙音箱用于测试
pipewire自带了蓝牙的模块，不需要像PulseAudio那样安装pulseaudio-bluetooth之类的包
安装了pipewire-pulse之后编辑/etc/pipewire/pipewire.conf在exec /usr/bin/pipewire-media-session后面加上-e bluez5就可以使用了。
1 exec /usr/bin/pipewire-media-session -e bluez5
卸载 换回PulseAudio或者Jack可以用这个脚本
1 2 3 4 5 6 7 8 9 10 11 cd /usr/lib64/sudo rm /usr/lib64/libpulse-mainloop-glib.so.0.999.0 sudo rm /usr/lib64/libpulse-simple.so.0.999.0 sudo rm /usr/lib64/libpulse.so.0.999.0 sudo rm /usr/lib64/libjack.so.0.999.0 sudo rm /usr/lib64/libjacknet.so.0.999.0 sudo rm /usr/lib64/libjackserver.so.0.999.0 sudo ldconfig
用pacman包管理器装的就
1 2 3 4 systemctl disable pipewire-pulse --user systemctl disable pipewire --user yay -Rs pipewire-pulse yay -S pulseaudio
更新一点实测 人耳效果和使用体验 昨天回到宿舍，发现笔记本的EndeavourOS更新python 3.9
两种音质人耳都听不出差别，室友把两段音频放到Adobe Audition也看不出什么大区别
笔记本自带外放在KDE的设置中从其他音频播放设备切换过去之后出现没有声音的状况，经检查其实是有的，只是非常小，将声音调整到最大还是几乎要被笔记本的风扇声音盖住（这貌似不是pipewire的锅，），重启后外放音量恢复正常。
面板参数 笔记本使用原来的PulseAudio详情：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Server String: /run/user/1000/pulse/native Library Protocol Version: 34 Server Protocol Version: 34 Is Local: yes Client Index: 16 Tile Size: 65472 User Name: zjk Host Name: zjk-7591 Server Name: pulseaudio Server Version: 14.0 Default Sample Specification: s16le 2ch 44100Hz Default Channel Map: front-left,front-right Default Sink: alsa_output.pci-0000_00_1f.3-platform-skl_hda_dsp_generic.HiFi__hw_sofhdadsp__sink Default Source: combined.monitor Cookie: 94e6 :e6bf
更换pipewire-pulse之后：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Server String: /run/user/1000/pulse/native Library Protocol Version: 34 Server Protocol Version: 34 Is Local: yes Client Index: 69 Tile Size: 65472 User Name: zjk Host Name: zjk-7591 Server Name: PulseAudio (on PipeWire 0.3 .17 ) Server Version: 14.0 .0 Default Sample Specification: float32le 2ch 48000Hz Default Channel Map: front-left,front-right Default Sink: alsa_output.pci-0000:00:1f.3-platform-skl_hda_dsp_generic.HiFi: hw:sofhdadsp,5: sink Default Source: alsa_input.pci-0000:00:1f.3-platform-skl_hda_dsp_generic.HiFi: hw:sofhdadsp: source Cookie: 6242 :4425
看起来参数是好了一点，实测听不出来。
其他 据说pipewire音视频延迟低了，手头没有专业设备没法测。其他的混响、均衡、采样手头没有专业设备也测不出来。
视频的话，浏览器HTML5播放器和本地VLC能正常播放。笔记本播放youtube4k视频外接4k显示器硬解没有大问题。VLC播放用N卡（笔记本的1650）解码也没有问题，驱动正常。
其他的视频方面和屏幕共享之类的功能暂时还没有测试。我也找不到熟悉视频的工具人了，等找到了再说吧，自己瞎测估计也测不出什么来。
体验 音质 pw-cli显示的台式机面板参数
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 $ pw-cli info 0 id : 0 permissions: rwxm type : PipeWire:Interface:Core/3 cookie: 653542227 user-name: "zjk" host-name: "zjk-allseries" version: "0.3.17" name: "pipewire-0" * properties: * core.name = "pipewire-0" * context.profile.modules = "none" * core.daemon = "true" * link.max-buffers = "16" * default.clock.rate = "48000" * default.clock.quantum = "1024" * default.clock.min-quantum = "32" * default.clock.max-quantum = "8192" * default.video.width = "640" * default.video.height = "480" * default.video.rate.num = "25" * default.video.rate.denom = "1" * mem.allow-mlock = "true" * cpu.max-align = "32" * object.id = "0"
教研室的Arch台式机的老声卡接耳机和外接绿联声卡接耳机看不出什么大的区别。
只有笔记本外放音质确实好了一点，我的笔记本外放能听出差别的那种，然而还是比win10差了不少（这个没有参考价值，我的笔记本Realtek驱动太阴间了）。
其他的等我的校交响乐团的工具人室友回来了再说。
遇到的问题 目前使用的问题大概有：
systemctl status --user pipewire-pulse报错
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 ● pipewire-pulse.service - PipeWire PulseAudio Loaded: loaded (/usr/lib/systemd/user/pipewire-pulse.service; enabled; vendor preset: enabled) Active: active (running) since Thu 2020-12-03 17:10:09 CST; 12min ago TriggeredBy: ● pipewire-pulse.socket Main PID: 1787 (pipewire-pulse) CGroup: /user.slice/user-1000.slice/[email protected] /app.slice/pipewire-pulse.service └─1787 /usr/bin/pipewire-pulse 12月 03 17:17:02 zjk-allseries pipewire-pulse[1787]: core 0x55fc6c39e410: proxy 0x55fc6c39e410 id:0: bound:-1 seq:1272 res:-32 (Broken pipe) msg:"connection error" 12月 03 17:17:25 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c30c300: [Google Chrome] ERROR command:42 (FLUSH_PLAYBACK_STREAM) tag:168 error:5 (No such file or directory) 12月 03 17:17:25 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c30c300: [Google Chrome] ERROR command:41 (CORK_PLAYBACK_STREAM) tag:169 error:5 (No such file or directory) 12月 03 17:17:26 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c30c300: [Google Chrome] ERROR command:41 (CORK_PLAYBACK_STREAM) tag:170 error:5 (No such file or directory) 12月 03 17:19:16 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c3deb80: [code] ERROR command:18 (PLAY_SAMPLE) tag:3 error:5 (No such file or directory) 12月 03 17:19:16 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c3deb80: [code] ERROR command:18 (PLAY_SAMPLE) tag:4 error:5 (No such file or directory) 12月 03 17:19:16 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c3deb80: [code] ERROR command:18 (PLAY_SAMPLE) tag:5 error:5 (No such file or directory) 12月 03 17:19:17 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c3deb80: [code] ERROR command:18 (PLAY_SAMPLE) tag:6 error:5 (No such file or directory) 12月 03 17:19:18 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c3deb80: [code] ERROR command:18 (PLAY_SAMPLE) tag:7 error:5 (No such file or directory) 12月 03 17:19:18 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c3deb80: [code] ERROR command:18 (PLAY_SAMPLE) tag:8 error:5 (No such file or directory) *** 12月 03 18:58:02 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c37c6f0: [VirtualBox] ERROR command:23 (GET_SOURCE_INFO) tag:249 error:5 (No such file or directory) 12月 03 19:00:16 zjk-allseries pipewire-pulse[1787]: pulse-server 0x55fc6c37c6f0: [VirtualBox] ERROR command:23 (GET_SOURCE_INFO) tag:376 error:5 (No such file or directory)
不过貌似都不影响使用
KDE调节音量的按钮换了之后经常卡死（KDE下面整个任务栏都卡死了），恢复之后调节音量无效
KDE音频切换设置偶尔卡死
下图这个
点终止之后整个plasma桌面都无了
上图中的Build-in Audio切换之后耳机没有声音
切换外放麦克风和耳机之后再切回来没声了
有几个人之前说virtualbox会冲突，我这暂时没遇到
2021.2更新后再次出问题了,pw-cli info 0显示
1 Error: "failed to connect: Host is down"
检查了一下发现systemd daemon不知道怎么没了。
1 2 Unit pipewire.service could not be found. Unit pipewire-pulse.service could not be found.
执行systemctl enable pipewire --user后重启还是找不到
systemctl status pipewire-pulse --user
报错：
1 2 3 4 5 6 7 8 9 10 11 12 13 ● pipewire-pulse.service - PipeWire PulseAudio Loaded: loaded (/usr/lib/systemd/user/pipewire-pulse.service; enabled; vendor preset: enabled) Active: active (running) since Sun 2021-02-14 10:03:07 CST; 12min ago TriggeredBy: ● pipewire-pulse.socket Main PID: 1168 (pipewire-pulse) CGroup: /user.slice/user-1000.slice/[email protected] /app.slice/pipewire-pulse.service └─1168 /usr/bin/pipewire-pulse 2月 14 10:15:40 zjk-7591 pipewire-pulse[1168]: pulse-server 0x557a2d6b64f0: failed to connect client: Host is down 2月 14 10:15:40 zjk-7591 pipewire-pulse[1168]: pulse-server 0x557a2d6ceab0: [QPulse] ERROR command:9 (SET_CLIENT_NAME) tag:1 error:6 > 2月 14 10:15:41 zjk-7591 pipewire-pulse[1168]: pulse-server 0x557a2d6b64f0: failed to connect client: Host is down 2月 14 10:15:41 zjk-7591 pipewire-pulse[1168]: pulse-server 0x557a2d6e1cb0: [QPulse] ERROR command:9 (SET_CLIENT_NAME) tag:1 error:6 > 2月 14 10:15:42 zjk-7591 pipewire-pulse[1168]: pulse-server 0x557a2d6b64f0: failed to connect client: Host is down
退坑保平安 换回PulseAudio了，不当小白鼠了，心累，好几次升级都有小问题，每次内核更新提心吊胆的。
2021.2
最近更新了Pipewire和kernel，开机加载界面的时候只加载出壁纸，kwin慢了十秒，Pipewire daemon加载失败，不想修了，直接换回PulseAudio。
在Pipewire出1.0稳定版和正式支持KDE之前一直用PulseAudio了。
参见 https://pipewire.org/ https://wiki.archlinux.org/index.php/PipeWire https://zh.wikipedia.org/wiki/PulseAudio https://lwn.net/Articles/734103/ https://blogs.gnome.org/uraeus/2020/09/04/pipewire-late-summer-update-2020/ pipewire 0.3的一些局限和问题
