aboutsummaryrefslogtreecommitdiff
path: root/lisp/emms-librefm-stream.el
blob: 9c55e410a000ac5452da5dc3fe9da9deb45c9bcd (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
;;; emms-librefm-stream.el --- Libre.FM streaming

;; Copyright (C) 2014  Free Software Foundation, Inc.

;; Author: Yoni Rabkin <yrk@gnu.org>

;; Keywords: emms, libre.fm, GNU FM

;; EMMS is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;;
;; EMMS is distributed in the hope that it will be useful, but WITHOUT
;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
;; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
;; License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with EMMS; see the file COPYING.  If not, write to the Free
;; Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
;; MA 02110-1301, USA.


;;; Code:

(require 'xml)
(require 'emms-playlist-mode)
(require 'emms-librefm-scrobbler)


(defvar emms-librefm-stream-host-url
  "alpha.libre.fm"
  "URL for the streaming host")

(defvar emms-librefm-stream-host-base-path
  ""
  "URL for the streaming host base path")

(defvar emms-librefm-stream-session-id
  ""
  "Session ID for radio.")

(defvar emms-librefm-stream-debug
  ""
  "Temporary debug information.")

(defvar emms-librefm-stream-station-name
  ""
  "Last station name tuned to.")

(defvar emms-librefm-stream-emms-tracklist
  ""
  "List of tracks for streaming.")

(defvar emms-librefm-stream-playlist-buffer-name
  "*Emms GNU FM*"
  "Name for non-interactive Emms GNU FM buffer.")

(defvar emms-librefm-stream-playlist-buffer nil
  "Non-interactive Emms GNU FM buffer.")


;;; ------------------------------------------------------------------
;;; HTTP
;;; ------------------------------------------------------------------

(defun emms-librefm-stream-assert-http ()
  "Assert a sane HTTP response from the server.

This function must be called inside the response buffer. Leaves
point after the HTTP headers."
  (goto-char (point-min))
  (when (not (re-search-forward "^.*200 OK$" (point-at-eol) t))
    (error "bad HTTP server response"))
  ;; go to the start of the FM response
  (when (not (re-search-forward "\n\n" (point-max) t))
    (error "bad FM server response")))


;;; ------------------------------------------------------------------
;;; radio handshake
;;; ------------------------------------------------------------------

(defun emms-librefm-stream-tune-handshake-string ()
  "Create the tune handshake string."
  (when (not emms-librefm-scrobbler-username)
    (error "null username"))
  (when (not emms-librefm-scrobbler-password)
    (error "null password"))
  (let ((url (concat "http://"
		     emms-librefm-stream-host-url
		     "/radio/handshake.php?"
		     "version=1.3.0.58" "&"
		     "platform=linux" "&"
		     "username=" (url-encode-url emms-librefm-scrobbler-username) "&"
		     "passwordmd5=" (md5 emms-librefm-scrobbler-password) "&"
		     "language=en")))
    url))

(defun emms-librefm-stream-tune-handshake-call ()
  "Make the tune handshake call."
  (let ((url-request-method "POST"))
    (let ((response
	   (url-retrieve-synchronously
	    (emms-librefm-stream-tune-handshake-string))))
      (setq emms-librefm-stream-debug
	    (with-current-buffer response
	      (buffer-substring-no-properties (point-min)
					      (point-max))))
      response)))

(defun emms-librefm-stream-handle-tune-handshake-response (resbuf)
  "Handle the tune handshake server response."
  (when (not (bufferp resbuf))
    (error "response not a buffer"))
  (with-current-buffer resbuf
    (emms-librefm-stream-assert-http)
    (let (radio-session-id
	  base-url
	  base-path
	  (start (point)))

      (if (re-search-forward "^session=\\(.*\\)$" (point-max) t)
	  (setq radio-session-id (match-string-no-properties 1))
	(error "no radio session ID from server"))

      (goto-char start)
      (if (re-search-forward "^base_url=\\(.*\\)$" (point-max) t)
	  (setq base-url (match-string-no-properties 1))
	(error "no base url from server"))

      (goto-char start)
      (if (re-search-forward "^base_path=\\(.*\\)$" (point-max) t)
	  (setq base-path (match-string-no-properties 1))
	(error "no base path from server"))

      (setq emms-librefm-stream-session-id radio-session-id
	    emms-librefm-stream-host-url base-url
	    emms-librefm-stream-host-base-path base-path))

    (message "radio handshake successful")))

(defun emms-librefm-stream-tune-handshake ()
  "Make and handle the tune handshake."
  (emms-librefm-stream-handle-tune-handshake-response
   (emms-librefm-stream-tune-handshake-call)))


;;; ------------------------------------------------------------------
;;; tuning
;;; ------------------------------------------------------------------

(defun emms-librefm-stream-tune-string (session-id station)
  "Create the tune string."
  (when (not session-id)
    (error "null session id"))
  (when (not station)
    (error "null station"))
  (let ((url (concat "http://"
		     emms-librefm-stream-host-url
		     emms-librefm-stream-host-base-path
		     "/adjust.php?"
		     "session=" session-id "&"
		     "url=" (url-encode-url station))))
    url))

(defun emms-librefm-stream-tune-call (session-id station)
  "Make the tune call."
  (let ((url-request-method "POST"))
    (let ((response
	   (url-retrieve-synchronously
	    (emms-librefm-stream-tune-string
	     session-id station))))
      (setq emms-librefm-stream-debug
	    (with-current-buffer response
	      (buffer-substring-no-properties (point-min)
					      (point-max))))
      response)))

(defun emms-librefm-stream-handle-tune-response (resbuf)
  "Handle the tune server response."
  (when (not (bufferp resbuf))
    (error "response not a buffer"))
  (with-current-buffer resbuf
    (emms-librefm-stream-assert-http)
    (let ((status (buffer-substring (point-at-bol)
				    (point-at-eol))))
      (let (response
	    url
	    stationname
	    (start (point)))

	(if (re-search-forward "^response=\\(.*\\)$" (point-max) t)
	    (setq response (match-string-no-properties 1))
	  (error "no response status code"))
	(when (not (string= response "OK"))
	  (error "tune response not OK"))

	(goto-char start)
	(if (re-search-forward "^url=\\(.*\\)$" (point-max) t)
	    (setq url (match-string-no-properties 1))
	  (error "no url from server"))

	(goto-char start)
	(if (re-search-forward "^stationname=\\(.*\\)$" (point-max) t)
	    (setq stationname (match-string-no-properties 1))
	  (error "no stationname from server"))

	(setq emms-librefm-stream-station-name stationname)

	(message "successfully tuned to: %s" stationname)))))

(defun emms-librefm-stream-tune (station)
  "Make and handle tune call."
  (emms-librefm-stream-handle-tune-response
   (emms-librefm-stream-tune-call
    emms-librefm-stream-session-id
    station)))


;;; ------------------------------------------------------------------
;;; radio.getPlaylist
;;; ------------------------------------------------------------------

(defun emms-librefm-stream-getplaylist-string (radio-session-id)
  "Create the getplaylist string."
  (when (not radio-session-id)
    (error "null radio session id"))
  (let ((url (concat "http://"
		     emms-librefm-stream-host-url
		     emms-librefm-stream-host-base-path
		     "/xspf.php?"
		     "sk=" radio-session-id "&"
		     "discovery=0"          "&"
		     "desktop=1.3.0.58")))
    url))

(defun emms-librefm-stream-getplaylist-call (session-id)
  "Make the getplaylist call."
  (let ((url-request-method "POST"))
    (let ((response
	   (url-retrieve-synchronously
	    (emms-librefm-stream-getplaylist-string session-id))))
      (setq emms-librefm-stream-debug
	    (with-current-buffer response
	      (buffer-substring-no-properties (point-min)
					      (point-max))))
      response)))

(defun emms-librefm-stream-handle-getplaylist-response (resbuf)
  "Handle the getplaylist server response."
  (when (not (bufferp resbuf))
    (error "response not a buffer"))
  (with-current-buffer resbuf
    (emms-librefm-stream-assert-http)
    (xml-parse-region (point) (point-max))))

(defun emms-librefm-stream-getplaylist ()
  "Make and handle radio.getPlaylist."
  (emms-librefm-stream-handle-getplaylist-response
   (emms-librefm-stream-getplaylist-call
    emms-librefm-stream-session-id)))


;;; ------------------------------------------------------------------
;;; XSPF
;;; ------------------------------------------------------------------

(defun emms-librefm-stream-xspf-find (tag data)
  "Return the tracklist portion of PLAYLIST or nil."
  (let ((tree (copy-tree data))
	result)
    (while (and tree (not result))
      (let ((this (car tree)))
	(when (and (listp this)
		   (eq (car this) tag))
	  (setq result this)))
      (setq tree (cdr tree)))
    result))

(defun emms-librefm-stream-xspf-tracklist (playlist)
  "Return the tracklist portion of PLAYLIST or nil."
  (emms-librefm-stream-xspf-find 'trackList (car playlist)))

(defun emms-librefm-stream-xspf-get (tag track)
  "Return the data associated with TAG in TRACK."
  (nth 2 (emms-librefm-stream-xspf-find tag track)))

(defun emms-librefm-stream-xspf-convert-track (track)
  "Convert TRACK to an Emms track."
  (let ((location (emms-librefm-stream-xspf-get 'location track))
	(title    (emms-librefm-stream-xspf-get 'title track))
	(album    (emms-librefm-stream-xspf-get 'album track))
	(creator  (emms-librefm-stream-xspf-get 'creator track))
	(duration (emms-librefm-stream-xspf-get 'duration track))
	(image    (emms-librefm-stream-xspf-get 'image track)))
    (let ((emms-track (emms-dictionary '*track*)))
      (emms-track-set emms-track 'name location)
      (emms-track-set emms-track 'info-artist creator)
      (emms-track-set emms-track 'info-title title)
      (emms-track-set emms-track 'info-album album)
      (emms-track-set emms-track 'info-playing-time
		      (/ (string-to-number duration)
			 1000))
      (emms-track-set emms-track 'type 'url)
      emms-track)))

(defun emms-librefm-stream-xspf-convert-tracklist (tracklist)
  "Convert TRACKLIST to a list of Emms tracks."
  (let (tracks)
    (mapc
     #'(lambda (e)
	 (when (and (listp e)
		    (eq 'track (car e)))
	   (setq tracks
		 (append tracks
			 `(,(emms-librefm-stream-xspf-convert-track e))))))
     tracklist)
    tracks))


;;; ------------------------------------------------------------------
;;; stream
;;; ------------------------------------------------------------------

(defun emms-librefm-stream-set-librefm-playlist-buffer ()
  "Setup the GNU FM buffer and make it `emms-playlist-buffer'."
  (when (not (buffer-live-p emms-librefm-stream-playlist-buffer))
    (setq emms-librefm-stream-playlist-buffer
	  (emms-playlist-new
	   emms-librefm-stream-playlist-buffer-name)))
  (setq emms-playlist-buffer emms-librefm-stream-playlist-buffer))

(defun emms-librefm-stream-queue ()
  "Queue streaming tracks."
  (let ((tracklist
	 (emms-librefm-stream-xspf-tracklist
	  (emms-librefm-stream-getplaylist))))
    (when (not tracklist)
      (setq emms-librefm-stream-emms-tracklist nil)
      (error "could not find tracklist"))
    (setq emms-librefm-stream-emms-tracklist
	  (emms-librefm-stream-xspf-convert-tracklist tracklist))

    (emms-librefm-stream-set-librefm-playlist-buffer)

    (with-current-emms-playlist
      (goto-char (point-max))
      (save-excursion
	(mapc
	 #'(lambda (track)
	     (emms-playlist-insert-track track))
	 emms-librefm-stream-emms-tracklist)))))

(defun emms-librefm-stream-queue-loader ()
  "Queue more streaming music if needed."
  (with-current-emms-playlist
    (goto-char (if emms-playlist-mode-selected-overlay
		   (overlay-start emms-playlist-mode-selected-overlay)
		 (point-min)))
    (when (and (eq (current-buffer)
		   emms-librefm-stream-playlist-buffer)
	       (not (next-single-property-change (point-at-eol)
						 'emms-track)))
      (emms-librefm-stream-queue))))

(defun emms-librefm-stream (station)
  "Stream STATION from a GNU FM server."
  (interactive "sEnter station URL: ")
  (when (not (stringp station))
    (error "bad argument"))

  (add-hook 'emms-player-finished-hook
	    'emms-librefm-stream-queue-loader)
  
  (emms-librefm-stream-tune-handshake)
  (emms-librefm-stream-tune station)

  (message "tuned to %s, getting playlist..."
	   emms-librefm-stream-station-name)

  (emms-librefm-stream-queue)
  (with-current-emms-playlist
    (emms-playlist-mode-play-current-track)))


(provide 'emms-librefm-stream)

;;; emms-librefm-stream.el ends here