/usr/share/emacs/site-lisp/emms/jack.el is in emms 4.4-1.
This file is owned by root:root, with mode 0o644.
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;; Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
;; Author: Mario Lang <mlang@delysid.org>
;; Keywords: multimedia, processes
;; 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:
;; JACK is a low-latency audio server, written for POSIX conformant
;; operating systems such as GNU/Linux and Apple's OS X. It can connect a
;; number of different applications to an audio device, as well as
;; allowing them to share audio between themselves. Its clients can run in
;; their own processes (ie. as normal applications), or they can run
;; within the JACK server (ie. as a "plugin").
;;
;; JACK was designed from the ground up for professional audio work, and
;; its design focuses on two key areas: synchronous execution of all
;; clients, and low latency operation.
;;
;; jack.el provides a fascility for starting jackd from within Emacs.
;; It also povides convenience functions for prompting the user for
;; jack client and port names in the minibuffer, as well as the
;; functions `jack-connect' and `jack-disconnect' which can be used to
;; rearrange jack port wiring with a minimum of keystrokes.
;;; Code:
(require 'emms-compat)
(defgroup jack ()
"Jack Audio Connection Kit"
:group 'processes)
(defcustom jack-rc '("~/.jackdrc" "/etc/jackd.conf")
"*JACK run control paths."
:group 'jack
:type 'repeat)
(defcustom jack-use-jack-rc t
"*If non-nil, try to retrieve jack startup arguments from run control files
listed in `jack-rc'. If no rc file is found or this variable is set
to nil, use the Emacs variables to build the startup args."
:group 'jack
:type 'boolean)
(defcustom jack-program (executable-find "jackd")
"*JACK executable path."
:group 'jack
:type 'file)
(defcustom jack-sample-rate 44100
"*Default sampling rate for JACK."
:group 'jack
:type 'integer)
(defcustom jack-period-size 128
"*Period size to use when launching new JACK process."
:group 'jack
:type 'integer)
(defcustom jack-alsa-device nil
"*ALSA soundcard to use."
:group 'jack
:type '(choice (const :tag "Ask" nil) string))
(defun jack-read-alsa-device ()
"Read an ALSA device name using the minibuffer."
(let (cards)
(with-temp-buffer
(insert-file-contents "/proc/asound/cards")
(while (not (eobp))
(if (looking-at "^ *\\([0-9]\\) \\[.+\\]: \\(.+\\)\n +\\(.*\\)$")
(setq cards (append (list (cons (match-string 3) (match-string 1))) cards)))
(forward-line 1)))
(concat "hw:" (cdr (assoc (completing-read "Card: " cards nil t) cards)))))
(defun jack-alsa-device ()
(or jack-alsa-device (jack-read-alsa-device)))
(defcustom jack-output-buffer-name "*JACK output*"
"*Output buffer name."
:group 'jack
:type 'string)
(defun jack-args ()
"Return a list of startup arguments to use.
First element is the executable path."
(or (and jack-use-jack-rc
(catch 'rc-found
(let ((files (mapcar 'expand-file-name jack-rc)))
(while files
(if (file-exists-p (car files))
(with-temp-buffer
(insert-file-contents (car files))
(when (> (buffer-size) 0)
(throw 'rc-found
(split-string (buffer-string) "[\n \t]+")))))
(setq files (cdr files))))
nil))
(list jack-program
"-v"
"-R"
"-dalsa"
(format "-d%s" (jack-alsa-device))
(format "-r%d" jack-sample-rate)
(format "-p%d" jack-period-size))))
(defcustom jack-set-rtlimits t
"*Use set_rtlimits (if available) to gain realtime priorities if -R
is given in jackd command-line."
:group 'jack
:type 'boolean)
(defcustom jack-set-rtlimits-program (executable-find "set_rtlimits")
"*Path to set_rtlimits."
:group 'jack
:type 'file)
(defun jack-maybe-rtlimits (args)
(if (and jack-set-rtlimits
(or (member "-R" args) (member "--realtime" args))
(file-exists-p jack-set-rtlimits-program))
(append (list jack-set-rtlimits-program "-r") args)
args))
(defvar jack-process nil)
(defvar jack-load 0)
(defvar jack-max-usecs 0)
(defvar jack-spare 0)
(defun jack-output-buffer ()
(or (get-buffer jack-output-buffer-name)
(with-current-buffer (get-buffer-create jack-output-buffer-name)
(setq major-mode 'jack-mode
mode-name "JACK"
mode-line-format (copy-tree mode-line-format))
(setcar (nthcdr 16 mode-line-format)
`(:eval (format "load:%.2f" jack-load)))
(add-hook 'kill-buffer-hook 'jack-kill nil t)
(current-buffer))))
(defvar jack-xruns nil)
(defun jack-filter (proc string)
(with-current-buffer (process-buffer proc)
(let ((moving (= (point) (process-mark proc))))
(save-excursion
(save-match-data
(if (string-match "^load = \\([^ ]+\\) max usecs: \\([^,]+\\), spare = \\(.+\\)$" string)
(setq jack-load (string-to-number (match-string 1 string))
jack-max-usecs (string-to-number (match-string 2 string))
jack-spare (string-to-number (match-string 3 string)))
(if (string-match "^**** alsa_pcm: xrun of at least \\([^ ]+\\) msecs$" string)
(push (string-to-number (match-string 1 string)) jack-xruns)
(goto-char (process-mark proc))
(insert string)
(set-marker (process-mark proc) (point))))))
(when moving (goto-char (process-mark proc))))))
(defun jack-running-p ()
(and jack-process (processp jack-process)
(eq (process-status jack-process) 'run)))
(defcustom jack-started-hook nil
"*Hook run when `jack-start' successfully started a new JACK intance."
:group 'jack
:type 'hook)
(defun jack-start ()
"Start the JACK process."
(interactive)
(if (jack-running-p) (error "JACK already running")
(setq jack-process
(apply 'start-process "jack" (jack-output-buffer)
(jack-maybe-rtlimits (jack-args))))
(set-process-filter jack-process #'jack-filter)
(run-hooks 'jack-started-hook)
(switch-to-buffer (jack-output-buffer))))
(defun jack-kill ()
"Kill the currently running JACK process."
(interactive)
(when (jack-running-p) (delete-process jack-process))
(setq jack-process nil))
(defun jack-restart ()
"Restart JACK."
(interactive)
(if (jack-running-p) (jack-kill))
(sit-for 0)
(jack-start))
(defun jack-list ()
"Retrieve a list of JACK clients/ports."
(with-temp-buffer
(call-process "jack_lsp" nil t nil "-cpl")
(goto-char (point-min))
(let (result current-port)
(while (not (eobp))
(cond
((looking-at "^\\([^ \t:]+\\):\\(.+\\)$")
(let ((program (match-string 1))
(port (match-string 2)))
(if (assoc program result)
(setcdr (assoc program result)
(append (cdr (assoc program result)) (list (setq current-port (list port)))))
(setq result
(append (list (list program (setq current-port (list port)))) result)))))
((looking-at "^ \\([^ \t:]+\\):\\(.+\\)$")
(if (assoc 'connections (cdr current-port))
(setcdr (assoc 'connections (cdr current-port))
(append (cdr (assoc 'connections current-port))
(list (list (match-string 1) (match-string 2)))))
(setcdr current-port
(append (list (list 'connections (list (match-string 1) (match-string 2)))) (cdr current-port)))))
((looking-at "^\tproperties: \\(.+\\),$")
(setcdr current-port
(append (list (append (list 'properties) (mapcar #'intern (split-string (match-string 1) ",")))) (cdr current-port)))))
(forward-line 1))
result)))
(defun jack-ports (program)
(cdr (assoc program (jack-list))))
(defun jack-get-port-connections (program port)
(cdr (assoc 'connections (cdr (assoc port (jack-ports program))))))
(defun jack-get-port-properties (program port)
(cdr (assoc 'properties (cdr (assoc port (jack-ports program))))))
(defun jack-get-direction (program port)
(let ((props (jack-get-port-properties program port)))
(or (car (member 'output props))
(car (member 'input props))
(error "Neither input nor output port"))))
(defun jack-read-program (prompt &optional predicate)
(let ((progs (if (functionp predicate)
(emms-remove-if-not predicate (jack-list))
(jack-list))))
(unless progs (error "No matching JACK clients found"))
(if (< (length progs) 2) (caar progs)
(completing-read prompt progs nil t))))
(defun jack-unique-port-name (strings)
(let ((start "")
(maxlen (apply 'min (mapcar #'length strings))))
(while (and (< (length start) maxlen)
(catch 'not-ok
(let ((nextchar (substring (car strings) (length start) (1+ (length start)))))
(mapc (lambda (str)
(unless (string= (concat start nextchar) (substring str 0 (1+ (length start))))
(throw 'not-ok nil)))
strings)
t)))
(setq start (substring (car strings) 0 (1+ (length start)))))
start))
(defun jack-read-port (program prompt &optional predicate)
(let ((ports (if (functionp predicate)
(emms-remove-if-not predicate (jack-ports program))
(jack-ports program))))
(if (< (length ports) 2) (caar ports)
(completing-read prompt ports nil t (jack-unique-port-name (mapcar 'car ports))))))
(defun jack-connect (from-program from-port to-program to-port)
"Connect FROM-PROGRAM's output port FROM-PORT to TO-PROGRAM's input port
TO-PORT.
If called interactively, the direction does not matter."
(interactive
(let* ((prog (jack-read-program "Connect: "))
(port (jack-read-port prog (format "Connect %s port: " prog)))
(to-type (if (eq (jack-get-direction prog port) 'input) 'output 'input))
(to-prog (jack-read-program
(format "Connect %s port %s to: " prog port)
(lambda (prog)
(emms-find-if (lambda (port)
(member to-type (assoc 'properties
(cdr port))))
(cdr prog)))))
(to-port (jack-read-port
to-prog
(format "Connect %s port %s to %s port: " prog port to-prog)
(lambda (port)
(member to-type (cdr (assoc 'properties (cdr port))))))))
(if (eq to-type 'input)
(list prog port to-prog to-port)
(list to-prog to-port prog port))))
(let ((result (call-process "jack_connect" nil nil nil
(format "%s:%s" from-program from-port)
(format "%s:%s" to-program to-port))))
(if (= result 0)
(message "JACK: Connected %s:%s to %s:%s"
from-program from-port to-program to-port))))
(defun jack-disconnect (from-program from-port to-program to-port)
"Disconnect FROM-PROGRAM's output port FROM-PORT from TO-PROGRAM's
input port TO-PORT.
If called interactively, the direction is not relevant."
(interactive
(let* ((prog (jack-read-program
"Disconnect: "
(lambda (prog)
(emms-find-if (lambda (port) (assoc 'connections (cdr port)))
(cdr prog)))))
(port (jack-read-port prog
(format "Disconnect %s port: " prog)
(lambda (port)
(assoc 'connections (cdr port)))))
(connections (jack-get-port-connections prog port))
(from (list prog port))
(to (if (< (length connections) 2)
(car connections)
(let* ((to-progs (let (result)
(mapc (lambda (conn)
(if (not (member (car conn) result))
(setq result
(append (list (car conn))
result))))
connections)
(mapcar #'list result)))
(to-prog (if (< (length to-progs) 2)
(caar to-progs)
(completing-read
(format "Disconnect %s port %s from: "
prog port) to-progs nil t))))
(setq connections (emms-remove-if-not
(lambda (conn)
(string= (car conn) to-prog))
connections))
(if (< (length connections) 2)
(car connections)
(let ((to-port (completing-read
(format "Disconnect %s port %s from %s port: "
prog port to-prog)
(mapcar #'cdr connections) nil t)))
(list to-prog to-port)))))))
(if (eq (jack-get-direction prog port) 'output)
(append from to)
(append to from))))
(let ((result (call-process "jack_disconnect" nil nil nil
(format "%s:%s" from-program from-port)
(format "%s:%s" to-program to-port))))
(if (= result 0)
(message "JACK: Disconnected %s:%s from %s:%s"
from-program from-port to-program to-port))))
(provide 'jack)
;;; jack.el ends here
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