目录

vocore2播放音频-使用路由器听歌？

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目标

构建一个可编程控制的流媒体播放服务器，类似于智能音箱，但是没有麦克风收集个人隐私数据。

整体架构如下

graph LR subgraph 树莓派 Raspberry Pi A[cmus音乐播放器] --> B(PulseAudio Client) end subgraph VoCore C(PulseAudio Server) --> D[音响 / 扬声器] end B --> C

Vocore固件支持

Currently 2022/12/3, only openwrt 21.02 is supported. (patch is not working ins 22.03)

see https://github.com/Vonger/vocore2

Because audio is enabled by kmod+ packages, so I need to build the firmware myself.

Alsa

install alsa-utils packages, then add configuration to init sound card

in /etc/rc.local file

alsactl init

Adjust volume

https://downloads.openwrt.org/releases/23.05.5/targets/ramips/mt76x8/packages

# list devices
amixer scontrols

amixer sset 'PCM' 50%
amixer sset 'Output 1' 50%

test audio

use madplay to play sounds

madplay -A -5 -r /tmp/5314e49717753082b203497887a7a7ec_5512980116828022124.mp3

PulseAudio

install Avahi/ZeroConf as pulseaudio server

opkg install pulseaudio-daemon-avahi

configure network access

# /etc/pulse/system.pa
load-module module-native-protocol-tcp auth-ip-acl=127.0.0.1;192.168.50.0/24;192.168.61.0/24
load-module module-zeroconf-publish

enhance low resources

# /etc/pulse/daemon.conf
 
high-priority = yes
nice-level = -11
 
realtime-scheduling = yes
 
resample-method = trivial
 
default-sample-format = s16le
default-sample-rate = 48000
default-sample-channels = 2
default-channel-map = front-left,front-right

test in client devices

export PULSE_SERVER=tcp:REMOTE_SERVER_IP

then run madplay to play sounds

how to connect by default

edit ~/.config/pulse/client.conf

default-server = tcp:REMOTE_SERVER_IP

# （可选）如果本地PulseAudio不断尝试启动并干扰连接，添加此行
# autospawn = no

Reference