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;; emms-player-mpd.el --- MusicPD support for EMMS
;; Copyright (C) 2005 Free Software Foundation, Inc.
;; Author: Michael Olson (mwolson AT gnu DOT org)
;; This file is not part of GNU Emacs.
;; This 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 2, or (at your option) any later
;; version.
;;
;; This 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Benefits
;; MusicPD features crossfade, very little skipping, many clients,
;; many supported output formats, and good abstraction of client and
;; server, among other things.
;;; MusicPD setup
;; You'll need to have both mpc and mpd installed. The website is at
;; http://musicpd.org/. Debian packages are available. I recommend
;; getting the latest development version; see
;; http://mpd.wikicities.com/wiki/Subversion for nightly Debian
;; packages and the svn repo.
;;
;; Copy the example configuration for mpd into ~/.mpdconf and edit it
;; to your needs. I using your top level music directory for
;; music_directory. If your playlists use absolute file names, be
;; certain that music_directory has the leading directory part.
;;
;; Before you try to play anything, but after setting up the above,
;; run `mkdir ~/.mpd && mpd --create-db' to create MusicPD's track
;; database.
;;
;; Check to see if mpd is running. It must be running as a daemon for
;; you to be able to play anything. Launch it by executing "mpd". It
;; can be killed later with "mpd --kill" (or just "killall mpd" if
;; you're not using the latest development version).
;;; EMMS setup
;; emms-pause and emms-seek are evil functions. You should hack them
;; so that they accept emms-player-mpd.
;; Add "emms-player-mpd" to the top of `emms-player-list'. If you use
;; absolute file names in your m3u playlists, make sure you set
;; `emms-player-mpd-music-directory' to the value of "music_directory"
;; from your MusicPD config.
;;; TODO
;; If you try to play individual songs, the tracks will not advance.
;; I recommend playing playlists instead. This should be addresed
;; eventually, though, perhaps with a connection to the mpd process.
;;
;; Instead of relying on mpc, we should get MPD_HOST and MPD_PORT from
;; the environment (or specify them as options), open a network
;; connection, send the command you want, then "\nclose" to close the
;; connection. Alternatively, the process can be left open (omitting
;; "close" but keeping "\n") for more commands. Apparently the
;; process closes automatically after a while though ... wonder how
;; other clients handle that.
;;
;; It might also be good to "sync" the mpd playlist with the emms one.
;; Currently we just clear the mpd playlist, add the track, and play,
;; for each track. Not the best approach, unless your track is a
;; playlist in itself, in which case all tracks from the playlist are
;; added immediately after clearing the mpd playlist.
(require 'emms-player-simple)
(defun emms-player-mpd-get-supported-regexp ()
"Returns a regexp of file extensions that MusicPD supports,
or nil if we cannot figure it out."
(let ((out (split-string (shell-command-to-string "mpd --version")
"\n"))
supported)
;; Get last non-empty line
(while (car out)
(when (not (string= (car out) ""))
(setq supported (car out)))
(setq out (cdr out)))
;; Create regexp
(when (and (stringp supported)
(not (string= supported "")))
(concat "\\`http://\\|\\.\\(m3u\\|pls\\|"
(mapconcat 'identity (delq nil (split-string supported))
"\\|")
"\\)\\'"))))
(defvar emms-player-mpd-supported-regexp
;; Use a sane default, just in case
(or (emms-player-mpd-get-supported-regexp)
"\\.\\(m3u\\|ogg\\|flac\\|mp3\\|wav\\|mod\\|aac\\)\\'")
"Formats supported by MusicPD Client.")
(defcustom emms-player-mpd-music-directory nil
"The value of 'music_directory' in your MusicPD configuration file.
You need this if your playlists use absolute file names, otherwise
leave it set to nil."
;; The :format part ensures that entering directories happens on the
;; next line, where there is more space to work with
:type '(choice :format "%{%t%}:\n %[Value Menu%] %v"
(const nil)
directory)
:group 'emms-player-mpd)
(define-emms-simple-player mpd '(file url playlist)
emms-player-mpd-supported-regexp "mpc")
(emms-player-set emms-player-mpd
'pause
'emms-player-mpd-pause)
(emms-player-set emms-player-mpd
'resume
'emms-player-mpd-pause)
(emms-player-set emms-player-mpd
'seek
'emms-player-mpd-seek)
(defun emms-player-mpd-clear ()
"Clear the playlist."
(shell-command-to-string (concat emms-player-mpd-command-name " clear")))
(defun emms-player-mpd-add (file)
"Add FILE to the current MusicPD playlist.
If we succeeded in adding the file, return the string from the
process, nil otherwise."
(when (and emms-player-mpd-music-directory
(not (string-match "\\`http://" file)))
(setq file (file-relative-name file emms-player-mpd-music-directory)))
(let ((output (shell-command-to-string (concat emms-player-mpd-command-name
" add " file))))
(when (and output (not (string= output "")))
output)))
(defun emms-player-mpd-load (playlist)
"Load contents of PLAYLIST into MusicPD by adding each line.
This handles both m3u and pls type playlists."
;; This allows us to keep playlists anywhere and not worry about
;; having to mangle their names. Also, mpd can't handle pls
;; playlists by itself.
(let ((pls-p (if (string-match "\\.pls\\'" playlist)
t
nil)))
(mapc #'(lambda (file)
(when pls-p
(if (string-match "\\`File[0-9]*=\\(.*\\)\\'" file)
(setq file (match-string 1 file))
(setq file "")))
(unless (or (string= file "")
(string-match "\\`#" file))
(emms-player-mpd-add file)))
(split-string (with-temp-buffer
(insert-file-contents playlist)
(buffer-string))
"\n"))))
(defun emms-player-mpd-play ()
"Play whatever is in the current MusicPD playlist."
(shell-command-to-string (concat emms-player-mpd-command-name " play")))
(defun emms-player-mpd-start (track)
"Starts a process playing TRACK."
(interactive)
(emms-player-mpd-clear)
(let ((name (emms-track-get track 'name)))
;; If it's a playlist, we have to `load' rather than `add' it
(if (string-match "\\.\\(m3u\\|pls\\)\\'" name)
(emms-player-mpd-load name)
(emms-player-mpd-add name)))
;; Now that we've added/loaded the file/playlist, play it
(emms-player-mpd-play))
(defun emms-player-mpd-stop ()
"Stop the currently playing song."
(interactive)
(shell-command-to-string (concat emms-player-mpd-command-name " stop")))
(defun emms-player-mpd-pause ()
"Pause the currently playing song."
(interactive)
(shell-command-to-string (concat emms-player-mpd-command-name " toggle")))
(defun emms-player-mpd-seek (sec)
"Seek backward or forward by SEC seconds, depending on sign of SEC."
(interactive)
(shell-command-to-string (concat emms-player-mpd-command-name
(format " seek %s%d"
(if (> sec 0) "+" "")
sec)))
;; Taking our cue from emms-player-mplayer-seek
(when (fboundp 'emms-lyrics-seek)
(emms-lyrics-seek sec)))
;; Not currently used by the API (to my knowledge), but I make use of
;; these to advance my playlists.
(defun emms-player-mpd-next ()
"Move forward by one track in MusicPD's internal playlist."
(interactive)
(shell-command-to-string (concat emms-player-mpd-command-name " next")))
(defun emms-player-mpd-previous ()
"Move backward by one track in MusicPD's internal playlist."
(interactive)
(shell-command-to-string (concat emms-player-mpd-command-name " previous")))
;; A "Now Playing" function -- I don't know how to integrate this into
;; emms-show.
(defun emms-player-mpd-show ()
"Show the currently-playing track. If nothing is playing, return nil."
(interactive)
(let ((np (car (split-string
(shell-command-to-string
(concat emms-player-mpd-command-name))
"\n"))))
(when (and np
(not (string= np ""))
(not (string-match "\\`\\(volume\\|error\\):" np)))
np)))
(provide 'emms-player-mpd)
;;; emms-player-mpd.el ends here
|
