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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) { | |
4 | this._socket = socket; | |
5 | this._cb_update_state = cb_update_state; | |
6 | this._queue = ['init']; | |
7 | this.state = {}; | |
8 | } | |
9 | ||
10 | Mpc.log = function(msg, obj) { | |
11 | console.log('mpc: ' + msg, obj); | |
12 | } | |
13 | ||
14 | Mpc.prototype.send = function(msg) { | |
15 | this._queue.push(msg); | |
16 | this._socket.send(msg, function(x) { | |
17 | Mpc.log('send: ' + msg + ':', x); | |
18 | }); | |
19 | } | |
20 | ||
21 | Mpc.prototype.recv_msg = function(lines) { | |
22 | curr = this._queue.shift(); | |
23 | Mpc.log('recv: [' + curr + ']:', lines.join('\n')); | |
24 | curr = curr.split(' '); | |
25 | ||
26 | switch (curr[0]) { | |
27 | // Needs to return a list of dicts (see above for dicts). | |
28 | //case 'playlistinfo': | |
29 | case 'currentsong': | |
30 | case 'stats': | |
31 | case 'status': | |
32 | state = {}; | |
33 | lines.forEach(function(line) { | |
34 | i = line.indexOf(':'); | |
35 | if (i == -1) | |
36 | return; // Ignores the OK line | |
37 | key = line.substr(0, i); | |
38 | val = line.substr(i + 2); | |
39 | state[key] = val; | |
40 | }); | |
41 | this.state = state; | |
42 | this._cb_update_state(state); | |
43 | break; | |
44 | default: | |
45 | this._cb_update_state(lines, curr); | |
46 | break; | |
47 | } | |
48 | } | |
49 | ||
50 | Mpc.prototype.recv = function(msg) { | |
51 | /* We can get back a bunch of responses in a row, so parse them out */ | |
52 | /* XXX: Do we have to handle partial reads ? like long playlists ... */ | |
53 | lines = msg.split('\n'); | |
54 | var i = 0; | |
55 | while (i < lines.length) { | |
56 | if (lines[i] == 'OK' || lines[i].substr(0, 3) == 'OK ') { | |
57 | this.recv_msg(lines.splice(0, i + 1)); | |
58 | i = 0; | |
59 | } else | |
60 | ++i; | |
61 | } | |
62 | } | |
63 | ||
64 | /* | |
65 | * Command generator helpers. | |
66 | */ | |
67 | ||
68 | Mpc.__make_send_void = function(cmd) { | |
69 | return function() { this.send(cmd); } | |
70 | } | |
71 | ||
72 | Mpc.__make_send_arg1 = function(cmd) { | |
73 | return function(a1) { | |
74 | if (a1 === undefined) | |
75 | Mpc.log(cmd + ': function requires one argument'); | |
76 | else | |
77 | this.send(cmd + ' ' + a1); | |
78 | } | |
79 | } | |
80 | ||
81 | Mpc.__make_send_arg2 = function(cmd) { | |
82 | return function(a1, a2) { | |
83 | if (a1 === undefined || a2 === undefined) | |
84 | Mpc.log(cmd + ': function requires two arguments'); | |
85 | else | |
86 | this.send(cmd + ' ' + a1 + ' ' + a2); | |
87 | } | |
88 | } | |
89 | ||
90 | Mpc.__make_send_opt = function(cmd) { | |
91 | return function(arg) { | |
92 | if (arg === undefined) | |
93 | arg = ''; | |
94 | this.send(cmd + ' ' + arg); | |
95 | }; | |
96 | } | |
97 | ||
98 | Mpc.__make_send_range = function(cmd, min, max, def) { | |
99 | return function(arg) { | |
100 | if (arg === undefined) | |
101 | arg = def; | |
102 | if (arg >= min && arg <= max) | |
103 | this.send(cmd + ' ' + arg); | |
104 | else | |
105 | Mpc.log(cmd + ': arg must be [' + min + ',' + max + '] but got "' + arg + '"'); | |
106 | }; | |
107 | } | |
108 | ||
109 | /* | |
110 | * Querying MPD's status | |
111 | * http://www.musicpd.org/doc/protocol/ch03.html#idp118752 | |
112 | */ | |
113 | ||
114 | // clearerror | |
115 | Mpc.prototype.clearerror = Mpc.__make_send_void('clearerror'); | |
116 | // currentsong | |
117 | Mpc.prototype.currentsong = Mpc.__make_send_void('currentsong'); | |
118 | // idle [SUBSYSTEMS...] | |
119 | // TODO | |
120 | // status | |
121 | Mpc.prototype.status = Mpc.__make_send_void('status'); | |
122 | // stats | |
123 | Mpc.prototype.stats = Mpc.__make_send_void('stats'); | |
124 | ||
125 | /* | |
126 | * Playback options | |
127 | * http://www.musicpd.org/doc/protocol/ch03s02.html | |
128 | */ | |
129 | ||
130 | // consume {STATE} | |
131 | Mpc.prototype.consume = Mpc.__make_send_range('consume', 0, 1, 1); | |
132 | // crossfade {SECONDS} | |
133 | Mpc.prototype.consume = Mpc.__make_send_arg1('crossfade'); | |
134 | // mixrampdb {deciBels} | |
135 | Mpc.prototype.mixrampdb = Mpc.__make_send_arg1('mixrampdb'); | |
136 | // mixrampdelay {SECONDS|nan} | |
137 | // Note: Probably should handle javascript NaN here. | |
138 | Mpc.prototype.mixrampdelay = Mpc.__make_send_arg1('mixrampdelay'); | |
139 | // random {STATE} | |
140 | Mpc.prototype.random = Mpc.__make_send_range('random', 0, 1, 1); | |
141 | // repeat {STATE} | |
142 | Mpc.prototype.repeat = Mpc.__make_send_range('repeat', 0, 1, 1); | |
143 | // setvol {VOL} | |
144 | Mpc.prototype.setvol = Mpc.__make_send_range('setvol', 0, 100); | |
145 | // single {STATE} | |
146 | Mpc.prototype.single = Mpc.__make_send_range('single', 0, 1, 1); | |
147 | // replay_gain_mode {MODE} | |
148 | Mpc.prototype.replay_gain_mode = Mpc.__make_send_arg1('replay_gain_mode'); | |
149 | // replay_gain_status | |
150 | ||
151 | /* | |
152 | * Controlling playback | |
153 | * http://www.musicpd.org/doc/protocol/ch03s03.html | |
154 | */ | |
155 | ||
156 | // next | |
157 | Mpc.prototype.next = Mpc.__make_send_void('next'); | |
158 | // pause {PAUSE} | |
159 | Mpc.prototype.pause = Mpc.__make_send_range('pause', 0, 1, 1); | |
160 | // play [SONGPOS] | |
161 | Mpc.prototype.play = Mpc.__make_send_opt('play'); | |
162 | // playid [SONGID] | |
163 | Mpc.prototype.playid = Mpc.__make_send_opt('playid'); | |
164 | // previous | |
165 | Mpc.prototype.previous = Mpc.__make_send_void('previous'); | |
166 | // seek {SONGPOS} {TIME} | |
167 | Mpc.prototype.seek = Mpc.__make_send_arg2('seek'); | |
168 | // seekid {SONGID} {TIME} | |
169 | Mpc.prototype.seekid = Mpc.__make_send_arg2('seekid'); | |
170 | // seekcur {TIME} | |
171 | Mpc.prototype.seekcur = Mpc.__make_send_arg1('seek'); | |
172 | // stop | |
173 | Mpc.prototype.stop = Mpc.__make_send_void('stop'); | |
174 | ||
175 | /* | |
176 | * Connection settings | |
177 | * http://www.musicpd.org/doc/protocol/ch03s08.html | |
178 | */ | |
179 | ||
180 | // close | |
181 | Mpc.prototype.close = Mpc.__make_send_void('close'); | |
182 | // kill | |
183 | Mpc.prototype.kill = Mpc.__make_send_void('kill'); | |
184 | // password {PASSWORD} | |
185 | Mpc.prototype.password = Mpc.__make_send_arg1('password'); | |
186 | // ping | |
187 | Mpc.prototype.ping = Mpc.__make_send_void('ping'); |