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emms-player-mpg321-remote.el
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;;; emms-player-mpg321-remote.el --- play files with mpg321 -R -*- lexical-binding: t; -*-
;; Copyright (C) 2006-2021 Free Software Foundation, Inc.
;; Author: Damien Elmes <[email protected]>
;; Keywords: emms, mp3, mpeg, multimedia
;; This file 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.
;; This file 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; This file provides an emms-player which uses mpg321's remote mode
;; to play files. This is a persistent process which isn't killed each
;; time a new file is played.
;; The remote process copes graciously with errors in music files, and
;; allows you to seek in files.
;; To enable this code, add the following to your emacs configuration:
;; (require 'emms-player-mpg321-remote)
;; (push 'emms-player-mpg321-remote emms-player-list)
;;; Code:
(require 'emms)
(require 'emms-player-simple)
;; --------------------------------------------------
;; Variables and configuration
;; --------------------------------------------------
(defgroup emms-player-mpg321-remote nil
"*EMMS player using mpg321's remote mode."
:group 'emms-player
:prefix "emms-player-mpg321-remote")
(defcustom emms-player-mpg321-remote-command "mpg321"
"The command name of mpg321."
:type 'string)
(defcustom emms-player-mpg321-remote-parameters nil
"Extra arguments to pass to mpg321 when using remote mode
For example: (list \"-o\" \"alsa\")"
:type '(repeat string))
(defcustom emms-player-mpg321-remote
(emms-player #'emms-player-mpg321-remote-start-playing
#'emms-player-mpg321-remote-stop-playing
#'emms-player-mpg321-remote-playable-p)
"A player for EMMS."
:type '(cons symbol alist))
(defvar emms-player-mpg321-remote-initial-args
(list "--skip-printing-frames=10" "-R" "-")
"Initial args to pass to the mpg321 process.")
(defvar emms-player-mpg321-remote-process-name "emms-player-mpg321-remote-proc"
"The name of the mpg321 remote player process")
(defvar emms-player-mpg321-remote-ignore-stop 0
"Number of stop messages to ignore, due to user action.")
(defmacro emms-player-mpg321-remote-add (cmd func)
`(emms-player-set 'emms-player-mpg321-remote
,cmd ,func))
(emms-player-mpg321-remote-add
'regex (emms-player-simple-regexp "mp3" "mp2"))
(emms-player-mpg321-remote-add
'pause 'emms-player-mpg321-remote-pause)
(emms-player-mpg321-remote-add
'resume 'emms-player-mpg321-remote-pause)
(emms-player-mpg321-remote-add
'seek 'emms-player-mpg321-remote-seek)
;; --------------------------------------------------
;; Process maintenence
;; --------------------------------------------------
(defun emms-player-mpg321-remote-start-process ()
"Start a new remote process, and return the process."
(let ((process (apply #'start-process
emms-player-mpg321-remote-process-name
nil
emms-player-mpg321-remote-command
(append emms-player-mpg321-remote-initial-args
emms-player-mpg321-remote-parameters))))
(set-process-sentinel process #'emms-player-mpg321-remote-sentinel)
(set-process-filter process #'emms-player-mpg321-remote-filter)
process))
(defun emms-player-mpg321-remote-stop ()
"Stop the currently playing process, if indeed there is one"
(let ((process (emms-player-mpg321-remote-process)))
(when process
(kill-process process)
(delete-process process))))
(defun emms-player-mpg321-remote-process ()
"Return the remote process, if it exists."
(get-process emms-player-mpg321-remote-process-name))
(defun emms-player-mpg321-remote-running-p ()
"True if the remote process exists and is running."
(let ((proc (emms-player-mpg321-remote-process)))
(and proc
(eq (process-status proc) 'run))))
(defun emms-player-mpg321-remote-sentinel (proc str)
"Sentinel for determining the end of process"
(ignore str)
(when (or (eq (process-status proc) 'exit)
(eq (process-status proc) 'signal))
;; reset
(setq emms-player-mpg321-remote-ignore-stop 0)
(message "Remote process died!")))
(defun emms-player-mpg321-remote-send (text)
"Send TEXT to the mpg321 remote process, and add a newline."
(let (proc)
;; we shouldn't be trying to send to a dead process
(unless (emms-player-mpg321-remote-running-p)
(emms-player-mpg321-remote-start-process))
(setq proc (emms-player-mpg321-remote-process))
(process-send-string proc (concat text "\n"))))
;; --------------------------------------------------
;; Interfacing with emms
;; --------------------------------------------------
(defun emms-player-mpg321-remote-filter (proc str)
(ignore proc)
(let* ((data-lines (split-string str "\n" t))
data
cmd)
(dolist (line data-lines)
(setq data (split-string line))
(setq cmd (car data))
(cond
;; stop notice
((and (string= cmd "@P")
(or (string= (cadr data) "0")
(string= (cadr data) "3")))
(emms-player-mpg321-remote-notify-emms))
;; frame notice
((string= cmd "@F")
;; even though a timer is constantly updating this variable,
;; updating it here will cause it to stay pretty much in sync.
(run-hook-with-args 'emms-player-time-set-functions
(truncate (string-to-number (nth 3 data)))))))))
(defun emms-player-mpg321-remote-start-playing (track)
"Start playing a song by telling the remote process to play it.
If the remote process is not running, launch it."
(unless (emms-player-mpg321-remote-running-p)
(emms-player-mpg321-remote-start-process))
(emms-player-mpg321-remote-play-track track))
(defvar emms-player-ignore-stop)
(defun emms-player-mpg321-remote-notify-emms (&optional user-action)
"Tell emms that the current song has finished.
If USER-ACTION, set `emms-player-mpg321-remote-ignore-stop' so that we
ignore the next message from mpg321."
(if user-action
(let ((emms-player-ignore-stop t))
;; so we ignore the next stop message
(setq emms-player-mpg321-remote-ignore-stop
(1+ emms-player-mpg321-remote-ignore-stop))
(emms-player-stopped))
;; not a user action
(if (not (zerop emms-player-mpg321-remote-ignore-stop))
(setq emms-player-mpg321-remote-ignore-stop
(1- emms-player-mpg321-remote-ignore-stop))
(emms-player-stopped))))
(defun emms-player-mpg321-remote-stop-playing ()
"Stop the current song playing."
(emms-player-mpg321-remote-notify-emms t)
(emms-player-mpg321-remote-send "stop"))
(defun emms-player-mpg321-remote-play-track (track)
"Send a play command to the remote, based on TRACK."
(emms-player-mpg321-remote-send
(concat "load " (emms-track-get track 'name)))
(emms-player-started 'emms-player-mpg321-remote))
(defun emms-player-mpg321-remote-playable-p (track)
;; use the simple definition.
(emms-player-mpg321-playable-p track))
(defun emms-player-mpg321-remote-pause ()
"Pause the player."
(emms-player-mpg321-remote-send "pause"))
(defun emms-player-mpg321-remote-resume ()
"Resume the player."
(emms-player-mpg321-remote-send "pause"))
(defun emms-player-mpg321-remote-seek (seconds)
"Seek forward or backward in the file."
;; since mpg321 only supports seeking by frames, not seconds, we
;; make a very rough guess as to how much a second constitutes
(let ((frame-string (number-to-string (* 35 seconds))))
;; if we're not going backwards, we need to add a '+'
(unless (eq ?- (string-to-char frame-string))
(setq frame-string (concat "+" frame-string)))
(emms-player-mpg321-remote-send (concat "jump " frame-string))))
(provide 'emms-player-mpg321-remote)
;;; emms-player-mpg321-remote.el ends here