闲置一套非常古老的索尼音响，可以放磁带、CD、广播的那种。幸好它还支持音频输入，所以索性连上树莓派，用shairport-sync打造一个airplay无线音响。

安装

https://github.com/mikebrady/shairport-sync/blob/master/INSTALL.md

关闭WiFi省电模式

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iwconfig wlan0 power off

然后重启。

（移除旧版本）

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$ which shairport-sync
/usr/local/bin/shairport-sync

移除旧版本：

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rm /usr/local/bin/shairport-sync

重复上面两条指令，直到没有更多shairport-sync。

(移除旧启动程序)

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rm /etc/systemd/system/shairport-sync.service
rm /lib/systemd/system/shairport-sync.service
rm /etc/init.d/shairport-sync

然后重启。

准备依赖

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apt-get install build-essential git xmltoman autoconf automake libtool libpopt-dev libconfig-dev libasound2-dev avahi-daemon libavahi-client-dev libssl-dev libsoxr-dev

下载安装

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git clone https://github.com/mikebrady/shairport-sync.git
cd shairport-sync/
autoreconf -fi
./configure --sysconfdir=/etc --with-alsa --with-soxr --with-avahi --with-ssl=openssl --with-systemd
make
sudo make install

配置Shairport

编辑配置文件/etc/shairport-sync.conf，有3处地方要改：

  • airplay时显示的设备名称：
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    general =
    {
      name = "name";
      // password = "secret";
      // ... other general settings
    };

  • 使用树莓派内置声卡时需要调整音量范围：

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    general =
    {
      volume_range_db = 60; 
    };

  • 选择音源输出设备（声卡）：

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    alsa =
    {
      output_device = "hw:0"; // the name of the alsa output device. Use "alsamixer" or "aplay" or "shairport-sync -h" to find out the names of devices, mixers, etc.
      mixer_control_name = "PCM"; // the name of the mixer to use to adjust output volume. If not specified, volume in adjusted in software.
      // ... other alsa settings

设置开机自启

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systemctl enable shairport-sync
systemctl start shairport-sync

troubleshoot

https://github.com/mikebrady/shairport-sync/issues/952
https://github.com/mikebrady/shairport-sync/issues/349
https://github.com/mikebrady/shairport-sync/issues/741

判断程序是否正常运行：

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shairport-sync -V
systemctl status shairport-sync

没有声音

很可能是音源输出不对。通过命令aplay -l或shairport-sync -h找到目标声卡名字，并更新至配置文件/etc/shairport-sync.conf中output_device = "hw:0"。如树莓派4的内置声卡为"hw:Headphones"。

声音太小

默认音域范围很窄，如果没有正确设置配置文件，需要手动调至0 dB附近。

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alsamixer