FMD (Douban FM Daemon)

FMD stands for Douban FM Daemon, inspired by MPD (Music Player Daemon). FMD plays music from Douban FM in background and communicate with clients through TCP connections.

Config

The main config file is ~/.fmd/fmd.conf. Config file includes several sections.

In DoubanFM section, there are the following config items:

channel [int]   # Douban FM Channel id
uid [string]    # Douban FM user id
uname [string]  # Douban FM user name
token [string]  # Douban FM authorization token
expire [string] # token expire time

To get a complete channel list, try:

wget -q -O - "http://www.douban.com/j/app/radio/channels" | json_pp

To get your own uid, uname, token and expire, try:

wget -q -O - --post-data="email=[email]&password=[passwd]&app_name=radio_desktop_win&version=100" "http://www.douban.com/j/app/login"

Replace [email] and [passwd] with your douban account and password.

In Output section, there are the following config items:

driver [string] # audio output driver, default is "alsa"
device [string] # audio output device, can be omitted
rate [int]      # audio ouput rate, default to 44100

As FMD uses libao for audio output, users may found it useful to refer to libao's driver document when deciding which driver to use. For example, users of PulseAudio should change the Output section to:

[Output]
driver = pulse
device = 0
rate = 44100

And for Mac users:

[Output]
driver = macosx
device =
rate = 44100

In Server section, there are the following config items:

address [string]# server listen address, default to "localhost"
port [int]      # server listen port, default to 10098

Please create a config file before using FMD. A sample config file is:

[DoubanFM]
channel = 0
uid = 123456
uname = username
token = 1234abcd
expire = 1345000000

[Output]
driver = alsa
device = default
rate = 44100

[Server]
address = localhost
port = 10098

Commands

The communication between FMD and clients go throught TCP connection.

Commands client can send are play, stop, pause, toggle, skip, ban, rate, unrate, info and end.

play: start playing
stop: stop playing, and set play position to 0:00
pause: stop playing
toggle: toggle between playing and pause
skip: skip current song
ban: mark current song as "dislike"
rate: mark current song as "like"
unrate: unmark current song
info: simply get FMD info
end: tell FMD to exit

Note: The recommand way to exit FMD is killall fmd. Because the end command must be sent from the client and will left the FMD port in wait-close for several minutes, during which time new FMD instance cannot bind to the port.

Protocol

FMD responses to all commands except end, the reponse is a json string containing current FMD infomation.

{
   "len" : 0,
   "sid" : 967698,
   "status" : "play",
   "channel" : 0,
   "like" : 0,
   "artist" : "花儿乐队",
   "album" : "幸福的旁边",
   "cover" : "http://img1.douban.com/mpic/s4433542.jpg",
   "url" : "/subject/1404476/",
   "user" : "小强",
   "pos" : 5,
   "title" : "别骗我",
   "year" : 1999
}

The simplest FMD client is telnet:

telnet localhost 10098
Trying ::1...
Connection failed: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
info
{"status":"play","channel":0,"user":"小强","title":"What's My Name (Intro #1)","artist":"Rihanna / Drake", "album":"Promo Only Rhythm...","year":2010,"cover":"http://img1.douban.com/mpic/s4615061.jpg","url":"/subject/5951920/","sid":1561924,"like":0,"pos":107,"len":254}
toggle
{"status":"pause","channel":0,"user":"小强","title":"What's My Name (Intro #1)","artist":"Rihanna / Drake", "album":"Promo Only Rhythm...","year":2010,"cover":"http://img1.douban.com/mpic/s4615061.jpg","url":"/subject/5951920/","sid":1561924,"like":0,"pos":111,"len":254}
toggle
{"status":"play","channel":0,"user":"小强","title":"What's My Name (Intro #1)","artist":"Rihanna / Drake", "album":"Promo Only Rhythm...","year":2010,"cover":"http://img1.douban.com/mpic/s4615061.jpg","url":"/subject/5951920/","sid":1561924,"like":0,"pos":111,"len":254}
help
{"status":"error","message":"wrong command: help"}

FMC is a command line client for FMD.

Install

FMD is written in C and depends on libcurl (for api calls and music downloading), json-c (for API parsing), mpg123 (for music decoding) and libao (for music playing).

Currently, there is no binary distribution for this project. So compile from source is the only option. FMD has been tested on Linux and Mac OS X 10.7.

git clone https://github.com/hzqtc/fmd.git
cd fmd
make release