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1 | // Written by Mike Frysinger <vapier@gmail.com>. Released into the public domain. Suck it. | |
2 | ||
3 | function Mpc(socket, cb_update_state, debug_enabled) { | |
4 | this._socket = socket; | |
5 | this._cb_update_state = cb_update_state; | |
6 | this._debug_enabled = debug_enabled; | |
7 | this._queue = ['init']; | |
8 | this.state = {}; | |
9 | } | |
10 | ||
11 | Mpc.prototype.log = function(lvl, msg, obj) { | |
12 | if (this._debug_enabled & lvl) | |
13 | console.log('mpc: ' + msg, obj); | |
14 | } | |
15 | ||
16 | Mpc.prototype.err = function(msg, obj) { | |
17 | console.error('mpc: ' + msg, obj); | |
18 | } | |
19 | ||
20 | Mpc.prototype.set_debug = function(val) { | |
21 | this._debug_enabled = val; | |
22 | } | |
23 | ||
24 | Mpc.prototype.send = function(msg) { | |
25 | var _this = this; | |
26 | this._queue.push(msg); | |
27 | this._socket.send(msg, function(x) { | |
28 | _this.log(0x1, 'send: ' + msg + ':', x); | |
29 | }); | |
30 | } | |
31 | ||
32 | Mpc.prototype.recv_msg = function(lines) { | |
33 | curr = this._queue.shift(); | |
34 | this.log(0x2, 'recv: [' + curr + ']:', lines.join('\n')); | |
35 | curr = curr.split(' '); | |
36 | ||
37 | switch (curr[0]) { | |
38 | // Needs to return a list of dicts (see above for dicts). | |
39 | //case 'playlistinfo': | |
40 | case 'currentsong': | |
41 | case 'stats': | |
42 | case 'status': | |
43 | state = {}; | |
44 | keys = []; | |
45 | lines.forEach(function(line) { | |
46 | i = line.indexOf(':'); | |
47 | if (i == -1) | |
48 | return; // Ignores the OK line | |
49 | key = line.substr(0, i); | |
50 | keys.push(key); | |
51 | val = line.substr(i + 2); | |
52 | state[key] = val; | |
53 | }); | |
54 | ||
55 | // When mpd is stopped, it gives us back crap values for some things. | |
56 | if ('state' in state && state.state == 'stop') { | |
57 | if ('volume' in state && state.volume == '-1') | |
58 | keys.splice(keys.indexOf('volume'), 1); | |
59 | } | |
60 | // Now merge the current state with the previous one so that we don't | |
61 | // lose information like volume or song position. | |
62 | curr_state = this.state; | |
63 | keys.forEach(function(key) { | |
64 | curr_state[key] = state[key]; | |
65 | }); | |
66 | ||
67 | this._cb_update_state(curr_state); | |
68 | break; | |
69 | default: | |
70 | this._cb_update_state(lines, curr); | |
71 | break; | |
72 | } | |
73 | } | |
74 | ||
75 | Mpc.prototype.recv = function(msg) { | |
76 | /* We can get back a bunch of responses in a row, so parse them out */ | |
77 | /* XXX: Do we have to handle partial reads ? like long playlists ... */ | |
78 | lines = msg.split('\n'); | |
79 | var i = 0; | |
80 | while (i < lines.length) { | |
81 | if (lines[i] == 'OK' || lines[i].substr(0, 3) == 'OK ') { | |
82 | this.recv_msg(lines.splice(0, i + 1)); | |
83 | i = 0; | |
84 | } else | |
85 | ++i; | |
86 | } | |
87 | } | |
88 | ||
89 | /* | |
90 | * Command generator helpers. | |
91 | */ | |
92 | ||
93 | Mpc.__make_send_void = function(cmd) { | |
94 | return function() { this.send(cmd); } | |
95 | } | |
96 | ||
97 | Mpc.__make_send_arg1 = function(cmd) { | |
98 | return function(a1) { | |
99 | if (a1 === undefined) | |
100 | this.err(cmd + ': function requires one argument'); | |
101 | else | |
102 | this.send(cmd + ' ' + a1); | |
103 | } | |
104 | } | |
105 | ||
106 | Mpc.__make_send_arg2 = function(cmd) { | |
107 | return function(a1, a2) { | |
108 | if (a1 === undefined || a2 === undefined) | |
109 | this.err(cmd + ': function requires two arguments'); | |
110 | else | |
111 | this.send(cmd + ' ' + a1 + ' ' + a2); | |
112 | } | |
113 | } | |
114 | ||
115 | Mpc.__make_send_opt = function(cmd) { | |
116 | return function(arg) { | |
117 | if (arg === undefined) | |
118 | arg = ''; | |
119 | this.send(cmd + ' ' + arg); | |
120 | }; | |
121 | } | |
122 | ||
123 | Mpc.__make_send_range = function(cmd, min, max, def) { | |
124 | return function(arg) { | |
125 | if (arg === undefined) | |
126 | arg = def; | |
127 | if (arg >= min && arg <= max) | |
128 | this.send(cmd + ' ' + arg); | |
129 | else | |
130 | this.err(cmd + ': arg must be [' + min + ',' + max + '] but got "' + arg + '"'); | |
131 | }; | |
132 | } | |
133 | ||
134 | /* | |
135 | * Querying MPD's status | |
136 | * http://www.musicpd.org/doc/protocol/ch03.html#idp118752 | |
137 | */ | |
138 | ||
139 | // clearerror | |
140 | Mpc.prototype.clearerror = Mpc.__make_send_void('clearerror'); | |
141 | // currentsong | |
142 | Mpc.prototype.currentsong = Mpc.__make_send_void('currentsong'); | |
143 | // idle [SUBSYSTEMS...] | |
144 | // TODO | |
145 | // status | |
146 | Mpc.prototype.status = Mpc.__make_send_void('status'); | |
147 | // stats | |
148 | Mpc.prototype.stats = Mpc.__make_send_void('stats'); | |
149 | ||
150 | /* | |
151 | * Playback options | |
152 | * http://www.musicpd.org/doc/protocol/ch03s02.html | |
153 | */ | |
154 | ||
155 | // consume {STATE} | |
156 | Mpc.prototype.consume = Mpc.__make_send_range('consume', 0, 1, 1); | |
157 | // crossfade {SECONDS} | |
158 | Mpc.prototype.crossfade = Mpc.__make_send_arg1('crossfade'); | |
159 | // mixrampdb {deciBels} | |
160 | Mpc.prototype.mixrampdb = Mpc.__make_send_arg1('mixrampdb'); | |
161 | // mixrampdelay {SECONDS|nan} | |
162 | // Note: Probably should handle javascript NaN here. | |
163 | Mpc.prototype.mixrampdelay = Mpc.__make_send_arg1('mixrampdelay'); | |
164 | // random {STATE} | |
165 | Mpc.prototype.random = Mpc.__make_send_range('random', 0, 1, 1); | |
166 | // repeat {STATE} | |
167 | Mpc.prototype.repeat = Mpc.__make_send_range('repeat', 0, 1, 1); | |
168 | // setvol {VOL} | |
169 | Mpc.prototype.setvol = Mpc.__make_send_range('setvol', 0, 100); | |
170 | // single {STATE} | |
171 | Mpc.prototype.single = Mpc.__make_send_range('single', 0, 1, 1); | |
172 | // replay_gain_mode {MODE} | |
173 | Mpc.prototype.replay_gain_mode = Mpc.__make_send_arg1('replay_gain_mode'); | |
174 | // replay_gain_status | |
175 | ||
176 | /* | |
177 | * Controlling playback | |
178 | * http://www.musicpd.org/doc/protocol/ch03s03.html | |
179 | */ | |
180 | ||
181 | // next | |
182 | Mpc.prototype.next = Mpc.__make_send_void('next'); | |
183 | // pause {PAUSE} | |
184 | Mpc.prototype.pause = Mpc.__make_send_range('pause', 0, 1, 1); | |
185 | // play [SONGPOS] | |
186 | Mpc.prototype.play = Mpc.__make_send_opt('play'); | |
187 | // playid [SONGID] | |
188 | Mpc.prototype.playid = Mpc.__make_send_opt('playid'); | |
189 | // previous | |
190 | Mpc.prototype.previous = Mpc.__make_send_void('previous'); | |
191 | // seek {SONGPOS} {TIME} | |
192 | Mpc.prototype.seek = Mpc.__make_send_arg2('seek'); | |
193 | // seekid {SONGID} {TIME} | |
194 | Mpc.prototype.seekid = Mpc.__make_send_arg2('seekid'); | |
195 | // seekcur {TIME} | |
196 | Mpc.prototype.seekcur = Mpc.__make_send_arg1('seek'); | |
197 | // stop | |
198 | Mpc.prototype.stop = Mpc.__make_send_void('stop'); | |
199 | ||
200 | /* | |
201 | * Connection settings | |
202 | * http://www.musicpd.org/doc/protocol/ch03s08.html | |
203 | */ | |
204 | ||
205 | // close | |
206 | Mpc.prototype.close = Mpc.__make_send_void('close'); | |
207 | // kill | |
208 | Mpc.prototype.kill = Mpc.__make_send_void('kill'); | |
209 | // password {PASSWORD} | |
210 | Mpc.prototype.password = Mpc.__make_send_arg1('password'); | |
211 | // ping | |
212 | Mpc.prototype.ping = Mpc.__make_send_void('ping'); | |
213 | ||
214 | /* | |
215 | * Audio output devices | |
216 | * http://www.musicpd.org/doc/protocol/ch03s09.html | |
217 | */ | |
218 | ||
219 | // disableoutput {ID} | |
220 | Mpc.prototype.disableoutput = Mpc.__make_send_arg1('disableoutput'); | |
221 | // enableoutput {ID} | |
222 | Mpc.prototype.enableoutput = Mpc.__make_send_arg1('enableoutput'); | |
223 | // outputs | |
224 | Mpc.prototype.outputs = Mpc.__make_send_void('outputs'); | |
225 | ||
226 | /* | |
227 | * Reflection | |
228 | * http://www.musicpd.org/doc/protocol/ch03s10.html | |
229 | */ | |
230 | ||
231 | // config | |
232 | Mpc.prototype.config = Mpc.__make_send_void('config'); | |
233 | // commands | |
234 | Mpc.prototype.commands = Mpc.__make_send_void('commands'); | |
235 | // notcommands | |
236 | Mpc.prototype.notcommands = Mpc.__make_send_void('notcommands'); | |
237 | // tagtypes | |
238 | Mpc.prototype.tagtypes = Mpc.__make_send_void('tagtypes'); | |
239 | // urlhandlers | |
240 | Mpc.prototype.urlhandlers = Mpc.__make_send_void('urlhandlers'); | |
241 | // decoders | |
242 | Mpc.prototype.decoders = Mpc.__make_send_void('decoders'); | |
243 | ||
244 | /* | |
245 | * Client to client | |
246 | * http://www.musicpd.org/doc/protocol/ch03s11.html | |
247 | */ | |
248 | ||
249 | // subscribe {NAME} | |
250 | Mpc.prototype.subscribe = Mpc.__make_send_arg1('subscribe'); | |
251 | // unsubscribe {NAME} | |
252 | Mpc.prototype.unsubscribe = Mpc.__make_send_arg1('unsubscribe'); | |
253 | // channels | |
254 | Mpc.prototype.channels = Mpc.__make_send_void('channels'); | |
255 | // readmessages | |
256 | Mpc.prototype.readmessages = Mpc.__make_send_void('readmessages'); | |
257 | // sendmessage {CHANNEL} {TEXT} | |
258 | Mpc.prototype.sendmessage = Mpc.__make_send_arg2('sendmessage'); |