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-;;; jack.el --- Jack Audio Connection Kit support
-
-;; 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