MPD播放器为C/S架构,MPD为Server,它的Client 有很多,MPC为其典型稳定的Client。

MPD 简介

MPD官网: https://www.musicpd.org/

OPENWRT安装教程: https://tnetter.wordpress.com/2015/03/14/install-mpd-di-openwrt/

用户手册:https://www.musicpd.org/doc/user/ 用户手册:https://mpd.readthedocs.io/en/stable/user.html

开源代码

基于web的MPD GUI:https://ympd.org/

1.源码下载

在github 上有其源码

下载地址:https://github.com/MusicPlayerDaemon/

包括

  • MPD
  • libmpdclient
  • mpc

2. 编译

编译环境要求

  • C++17 编译器 (例如: GCC 8 or clang 7)
  • Meson 0.56.0 and Ninja
  • Boost 1.58
  • pkg-config

2.1安装所需要的依赖包

1)boost

boost 是C++ 库,mpd 和mpc都是C++,在实现过程会用的boost库,所有需要在ubuntu上先安装boost 。

boost下载地址:http://www.boost.org/users/history/version_1_66_0.html

#tar xvzf boost_1_50_0.tar.gz
#cd boost_1_50_0
#sh ./bootstrap.sh
#./b2

编译完后会有如下log输出:

The Boost C++ Libraries were successfully built!
The following directory should be added to compiler include paths:
    /home/mpddev/code/mpd/boost_1_66_0
The following directory should be added to linker library paths:
    /home/mpddev/code/mpd/boost_1_66_0/stage/lib

2)meson、Ninja

编译libmpdclient 需要meson、Ninja

meson下载、编译、 安装:

源码下载:https://github.com/mesonbuild/meson

python3 setup.py build
sudo python3 setup.py install

安装Ninja:

sudo apt-get install ninja

3)FFmpeg 安装

mpd 是基于FFmpeg 实现的,所有必须在编译mpd 前安装FFmpeg库: 下载地址:https://github.com/FFmpeg/FFmpeg

./configure
make
sudo make install

2.2 编译mpd

tar -xf mpd-0.20.18.tar.xz
cd mpd-0.20.18
./configure --disable-jack --with-boost=XXX --enable-ffmpeg

说明:

--with-boost=指定boost库所在的路径如:/home/mpddev/code/mpd/boost_1_66_0

make
sudo make install

编译成功后,会在src/路径下生产mpd 可执行程序。

2.3 编译libmpdclient

进入libmpdclient 目录,创建编译输出文件夹(mkdir output)

meson . output
ninja -C output
sudo ninja -C output install

可参照:https://github.com/MusicPlayerDaemon/libmpdclient

2.4 编译mpc

方法同libmpdclient:

进入mpc目录,创建编译输出文件夹(mkdir output)

meson . output
ninja -C output
sudo ninja -C output install

可参照:https://github.com/MusicPlayerDaemon/mpc

3. 运行mpd 和mpc

准备好mpd.conf配置文件 /etc/mpd.conf

内容:

music_directory   "/Media/SD-P1/music"
playlist_directory  "/Media/SD-P1/music/.mpd"
db_file     "/Media/SD-P1/music/.mpd/mpd.db"
log_file    "/Media/SD-P1/music/.mpd/mpd.log"
pid_file    "/Media/SD-P1/music/.mpd/mpd.pid"
state_file    "/Media/SD-P1/music/.mpd/mpd.state"
bind_to_address   "any"
port        "6600"

audio_output {
  type    "alsa"
  name    "MT7688"
  use_mmap  "yes"
  mixer_control "Playback"
}

直接运行,在一个终端执行:

sudo mpd --stdout --no-daemon --verbose /etc/mpd.conf

作为启动mpd服务

/etc/init.d/mpd restart

打开另一个终端执行mpc

如查询mpd的版本信息: mpc version

mpc 更多命令和使用方法,可执行:mpc help 查看。

4.播放测试

4.1 播放本地音乐

把音乐拷贝到mpd.conf中music_directory所配置的目录下,如我的配置是:

music_directory   "/Media/SD-P1/music"

复制一个mp3文件到/Media/SD-P1/music目录下,并改名为test.mp3等。

启动mpd后,通过mpc进行添加播放列表和播放音频文件:

mpc add test.mp3
mpc play 1

4.2 播放url 资源

gstreamer 上有大量各种格式的音频文件可用于测试:

https://gstreamer.freedesktop.org/media/

测试方法同样是先确保mpd 已经起来,然后使用

mpc add url

例如:

mpc add https://gstreamer.freedesktop.org/media/small/audio-short.ogg
mpc play 2

5. 运行时遇到的问题

问题1:

mpc: error while loading shared libraries: libmpdclient.so.2: cannot open shared object file: No such file or directory 解决:

sudo ln -sb /usr/local/lib/x86_64-linux-gnu/libmpdclient.so.2.14 /usr/lib/libmpdclient.so.2

问题2:

mpc 播放MP3时提示“mpd: Failed to read mixer for ‘My ALSA Device’: no such mixer control: PCM”,如下log:

alsa_output: opened default type=IOPLUG
alsa_output: buffer: size=48..524288 time=1088..11888617
alsa_output: period: size=16..174763 time=362..3962880
alsa_output: default period_time = buffer_time/4 = 500000/4 = 125000
alsa_output: format=S24_LE (Signed 24 bit Little Endian)
alsa_output: buffer_size=22050 period_size=5512
output: opened plugin=alsa name="hw:0,0" audio_format=44100:24:2
exception: Failed to open mixer for 'hw:0,0': no such mixer control: PCM
player: played "test.mp3"
playlist: stop
output: closed plugin=alsa name="hw:0,0"

解决: 修改mpd.conf

audio_output {
        type            "alsa"
#        name            "plug:dmix"
        name            "My ALSA Device"
#        device          "plughw:0,0"
 #      format          "44100:16:2"    # optional
#       mixer_type       "software"
#      mixer_device    "default"       # optional
#      mixer_control   "PCM"           # optional
#     mixer_index     "0"             # optional
}

修改为:

audio_output {
        type            "alsa"
#        name            "plug:dmix"
        name            "My ALSA Device"
        device          "plughw:0,0"
       format          "44100:16:2"    # optional
       mixer_type       "software"
#      mixer_device    "default"       # optional
#      mixer_control   "PCM"           # optional
#     mixer_index     "0"             # optional
}