blob: 22c1a992507782c7053d129e3cf33f49e396b7e3 (
plain)
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
|
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2023 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix 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 Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu home services sound)
#:use-module (gnu home services)
#:use-module (gnu home services shepherd)
#:use-module (guix records)
#:use-module (guix gexp)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:export (home-pulseaudio-rtp-sink-service-type
home-pulseaudio-rtp-source-service-type
%pulseaudio-rtp-multicast-address))
;;;
;;; PulseAudio support.
;;;
(define (with-pulseaudio-connection sock exp)
;; Wrap EXP in an expression where SOCK is bound to a socket connected to
;; the user's PulseAudio command-line interface socket.
#~(let* ((#$sock (socket AF_UNIX SOCK_STREAM 0))
(pulse-user-file
(lambda (name)
(string-append "/run/user/" (number->string (getuid))
"/pulse/" name)))
(file (pulse-user-file "cli")))
(let loop ((tries 0))
(catch #t
(lambda ()
(connect #$sock AF_UNIX file)
(let ((result #$exp))
(close-port #$sock)
result))
(lambda (key . args)
(if (and (eq? key 'system-error)
(= ENOENT (system-error-errno (cons key args)))
(< tries 3))
;; The CLI socket doesn't exist yet, so send pulseaudio
;; SIGUSR2 so that it creates it and listens to it.
(let ((pid (call-with-input-file (pulse-user-file "pid")
read)))
(when (and (integer? pid) (> pid 1))
(kill pid SIGUSR2))
((@ (fibers) sleep) 1)
(loop (+ tries 1)))
(begin
(close-port #$sock)
(apply throw key args))))))))
(define %pulseaudio-rtp-multicast-address
;; Default address used by 'module-rtp-sink' and 'module-rtp-recv'. This is
;; a multicast address, for the Session Announcement Protocol (SAP) and the
;; Session Description Protocol (SDP).
"224.0.0.56")
(define (pulseaudio-rtp-sink-shepherd-services destination-ip)
(list (shepherd-service
(provision '(pulseaudio-rtp-sink))
(start
#~(lambda* (#:optional (destination-ip #$destination-ip))
#$(with-pulseaudio-connection
#~sock
#~(begin
(display "\
load-module module-null-sink \
sink_name=rtp sink_properties=\"device.description='RTP network output'\"\n"
sock)
(display (string-append "\
load-module module-rtp-send source=rtp.monitor"
(if destination-ip
(string-append
" destination_ip="
destination-ip)
"")
"\n")
sock)
#t))))
(stop
#~(lambda (_)
#$(with-pulseaudio-connection
#~sock
#~(begin
(display "unload-module module-rtp-send\n"
sock)
(display "unload-module module-null-sink\n"
sock)
#f))))
(auto-start? #f))))
(define home-pulseaudio-rtp-sink-service-type
(service-type
(name 'pulseaudio-rtp-sink)
(extensions
(list (service-extension home-shepherd-service-type
pulseaudio-rtp-sink-shepherd-services)))
(description
"Define a PulseAudio sink to broadcast audio output over RTP, which can
then by played by another PulseAudio instance.")
;; By default, send to the SAP multicast address, 224.0.0.56, which can be
;; network-intensive.
(default-value %pulseaudio-rtp-multicast-address)))
(define (pulseaudio-rtp-source-shepherd-services source-ip)
(list (shepherd-service
(provision '(pulseaudio-rtp-source))
(start
#~(lambda* (#:optional (source-ip #$source-ip))
#$(with-pulseaudio-connection
#~sock
#~(begin
(format sock "\
load-module module-rtp-recv sap_address=~a\n" source-ip)
#t))))
(stop
#~(lambda (_)
#$(with-pulseaudio-connection
#~sock
#~(begin
(display "unload-module module-rtp-recv\n"
sock)
#f))))
(auto-start? #f))))
(define home-pulseaudio-rtp-source-service-type
(service-type
(name 'pulseaudio-rtp-source)
(extensions
(list (service-extension home-shepherd-service-type
pulseaudio-rtp-source-shepherd-services)))
(description
"Define a PulseAudio source to receive audio broadcasted over RTP by
another PulseAudio instance.")
(default-value %pulseaudio-rtp-multicast-address)))
|