我目前正在尝试使 HSP 蓝牙配置文件在基于 Atmel SAMA5D2 的定制板上工作。我正在使用由 Buildroot-2017-08 制作的定制 Linux。
我正在尝试配置pulseaudio。 pulseaudio 包是来自 buildroot 的包，我勾选了“作为系统守护进程启动”。
当系统启动时，pulseaudio似乎正在运行
# ps aux | grep pulse
174 pulse usr/bin/pulseaudio --system --daemonize --disallow-exit --disallow-module-loading
197 root grep pulse
但是，当我尝试与守护进程通信时，它失败了
# pacmd
No PulseAudio daemon running, or not running as session daemon.
# pacmd info
No PulseAudio daemon running, or not running as session daemon.
# pactl info
Connection failure: Access denied
我意识到如果我导出以下环境变量，消息会发生变化
# export PULSE_RUNTIME_PATH="/run/pulse"
# pacmd info
Daemon not responding.
# pactl info
Connection failure: Access denied
关于访问此文件夹的权限，它们是
# ls -la /run/pulse/
total 8
drwx------ 3 root root 120 Jan 2 05:09 .
drwxr-xr-x 6 root root 240 Jan 2 05:09 ..
drwxr-xr-x 3 pulse pulse 60 Jan 2 05:09 .config
-rw------- 1 pulse pulse 16 Jan 2 05:09 .esd_auth
srwxrwxrwx 1 pulse pulse 0 Jan 2 05:09 native
-rw------- 1 pulse pulse 4 Jan 2 05:09 pid
从这个问题脉冲音频问题 - pavucontrol 和 pacmd 未连接到脉冲音频我尝试更改该目录的权限，但没有改变任何内容。
# ls -la /run/pulse/
total 8
drwx------ 3 pulse pulse 120 Jan 2 05:09 .
drwxr-xr-x 6 root root 240 Jan 2 05:09 ..
drwxr-xr-x 3 pulse pulse 60 Jan 2 05:09 .config
-rw------- 1 pulse pulse 16 Jan 2 05:09 .esd_auth
srwxrwxrwx 1 pulse pulse 0 Jan 2 05:09 native
-rw------- 1 pulse pulse 4 Jan 2 05:09 pid
查看日志时似乎存在一些问题，但我不能说这是否是一个大问题。
# cat /var/log/messages | grep pulse
Jan 2 05:43:19 buildroot pulseaudio[174]: [pulseaudio] caps.c: Normally all extra capabilities would be dropped now, but that's impossible because PulseAudio was built without capabil.
Jan 2 05:43:19 buildroot pulseaudio[174]: [pulseaudio] main.c: OK, so you are running PA in system mode. Please note that you most likely shouldn't be doing that.
Jan 2 05:43:19 buildroot pulseaudio[174]: [pulseaudio] main.c: If you do it nonetheless then it's your own fault if things don't work as expected.
Jan 2 05:43:19 buildroot pulseaudio[174]: [pulseaudio] main.c: Please read http://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/WhatIsWrongWithSystemWide/ for an exp.
Jan 2 05:43:19 buildroot pulseaudio[174]: [pulseaudio] module.c: module-detect is deprecated: Please use module-udev-detect instead of module-detect!
Jan 2 05:43:19 buildroot pulseaudio[174]: [pulseaudio] alsa-util.c: Disabling timer-based scheduling because high-resolution timers are not available from the kernel.
Jan 2 05:43:20 buildroot pulseaudio[174]: [pulseaudio] authkey.c: Failed to open cookie file '/var/run/pulse/.config/pulse/cookie': No such file or directory
Jan 2 05:43:20 buildroot pulseaudio[174]: [pulseaudio] authkey.c: Failed to load authentication key '/var/run/pulse/.config/pulse/cookie': No such file or directory
Jan 2 05:43:20 buildroot pulseaudio[174]: [pulseaudio] authkey.c: Failed to open cookie file '/var/run/pulse/.pulse-cookie': No such file or directory
Jan 2 05:43:20 buildroot pulseaudio[174]: [pulseaudio] authkey.c: Failed to load authentication key '/var/run/pulse/.pulse-cookie': No such file or directory
另外，我无法选择以root身份运行pulseaudio，因为我的目标上没有其他用户。
编辑 ：
以详细模式（-vvv）重新启动pulseaudio后，问题似乎来自无效的连接数据
# pactl info -vvv
Connection failure: Access denied
# cat /var/log/messages | grep pulse | tail -n 20
Jan 2 06:27:51 buildroot pulseaudio[250]: [pulseaudio] main.c: Daemon startup successful.
Jan 2 06:27:51 buildroot pulseaudio[252]: [pulseaudio] main.c: Daemon startup complete.
Jan 2 06:27:51 buildroot pulseaudio[252]: [pulseaudio] module.c: Unloading "module-detect" (index: #0).
Jan 2 06:27:51 buildroot pulseaudio[252]: [pulseaudio] module.c: Unloaded "module-detect" (index: #0).
Jan 2 06:27:56 buildroot pulseaudio[252]: [pulseaudio] module-suspend-on-idle.c: Sink alsa_output.0.analog-stereo idle for too long, suspending ...
Jan 2 06:27:56 buildroot pulseaudio[252]: [pulseaudio] sink.c: Suspend cause of sink alsa_output.0.analog-stereo is 0x0004, suspending
Jan 2 06:27:56 buildroot pulseaudio[252]: [alsa-sink-CLASSD PCM atmel-classd-hifi-0] alsa-sink.c: Device suspended...
Jan 2 06:27:56 buildroot pulseaudio[252]: [pulseaudio] core.c: Hmm, no streams around, trying to vacuum.
Jan 2 06:28:28 buildroot pulseaudio[252]: [pulseaudio] client.c: Created 0 "Native client (UNIX socket client)"
Jan 2 06:28:28 buildroot pulseaudio[252]: [pulseaudio] protocol-native.c: Protocol version: remote 31, local 31
Jan 2 06:28:28 buildroot pulseaudio[252]: [pulseaudio] protocol-native.c: Got credentials: uid=0 gid=0 success=0
Jan 2 06:28:28 buildroot pulseaudio[252]: [pulseaudio] protocol-native.c: Denied access to client with invalid authentication data.
Jan 2 06:28:28 buildroot pulseaudio[252]: [pulseaudio] client.c: Freed 0 "Native client (UNIX socket client)"
Jan 2 06:28:28 buildroot pulseaudio[252]: [pulseaudio] protocol-native.c: Connection died.
Jan 2 06:28:43 buildroot pulseaudio[252]: [pulseaudio] client.c: Created 1 "Native client (UNIX socket client)"
Jan 2 06:28:43 buildroot pulseaudio[252]: [pulseaudio] protocol-native.c: Protocol version: remote 31, local 31
Jan 2 06:28:43 buildroot pulseaudio[252]: [pulseaudio] protocol-native.c: Got credentials: uid=0 gid=0 success=0
Jan 2 06:28:43 buildroot pulseaudio[252]: [pulseaudio] protocol-native.c: Denied access to client with invalid authentication data.
Jan 2 06:28:43 buildroot pulseaudio[252]: [pulseaudio] client.c: Freed 1 "Native client (UNIX socket client)"
Jan 2 06:28:43 buildroot pulseaudio[252]: [pulseaudio] protocol-native.c: Connection died.
将root用户添加到pulse组后问题仍然存在。
编辑2：
更改进程访问权限以允许脉冲组的成员读/写和执行文件似乎解锁了一些情况，因为我现在可以与守护进程通信但不能对其进行操作。
# pactl info
Server String: /run/pulse/native
Library Protocol Version: 31
Server Protocol Version: 31
Is Local: yes
Client Index: 1
Tile Size: 65496
User Name: pulse
Host Name: buildroot
Server Name: pulseaudio
Server Version: 9.0
Default Sample Specification: s16le 2ch 44100Hz
Default Channel Map: front-left,front-right
Default Sink: alsa_output.platform-fc048000.classd.analog-stereo
Default Source: alsa_output.platform-fc048000.classd.analog-stereo.monitor
Cookie: 6ae9:b402
# pacmd info
Daemon not responding.
答案1
最后，似乎这是一个配置文件问题。
我刚刚将 umask 行从 更改umask 077为umask 007in /etc/init.d/S50pulseaudio，以便脉冲组的成员可以访问文件。
内容/etc/init.d/S50pulseaudio：
#!/bin/sh
#
# Starts pulseaudio.
#
start() {
printf "Starting pulseaudio: "
#umask 077
umask 007
/usr/bin/pulseaudio --system --daemonize --disallow-exit --disallow-module-loading -vvv
echo "OK"
}
stop() {
printf "Stopping pulseaudio: "
killall pulseaudio
echo "OK"
}
restart() {
stop
start
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart|reload)
restart
;;
*)
echo "Usage: $0 {start|stop|restart}"
exit 1
esac
exit $?
关于pacmd这是正常的，我无法访问它，因为我正在全系统范围内运行pulseaudio。