scmakempdsender
205 lines (180 with data), 5.6 kB
#!/usr/bin/env python
# Copyright (C) 2015 J.F.Dockes
# This program 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 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the
# Free Software Foundation, Inc.,
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
from __future__ import print_function
# Auxiliary script for the Unix Songcast mpd-based sender: we create
# an mpd process which writes to a fifo only, and an uxsender process
# (Songcast sender) which reads from the fifo
#
# The MPD process is in turn controlled from the upmpdcli process
# which initiated the whole thing, which will normally stop the
# current mpd playing (can't use it: the audio would not be in sync
# with the Songcast one), copy the current playlist to the new mpd,
# and start a local Receiver for playing. Other Receivers can then
# connect to the Sender to achieve multiroom synchronized play
import tempfile
import time
import subprocess
import os
import sys
import uuid
import getopt
import signal
import socket
uxsender = "mpd2sc"
def usage(f):
print("Usage: scmakempdsender [-h] [-f friendlyname] [-p mpdport] [-u] [-e]",
file=f)
sys.exit(1)
upmpdclitoo = False
mpdport = 6700
externalvolume = False
# Upmpdcli friendly-name. Used to compute a Uuid in conjunction with
# the node name
upmpdcli_fname = "UpMpd"
def logerr(s):
print("%s" % s, file=sys.stderr)
args = sys.argv[1:]
opts, args = getopt.getopt(args, "hup:f:e")
for opt, arg in opts:
if opt in ['-h']:
usage(sys.stdout)
elif opt in ['-f']:
upmpdcli_fname = arg
elif opt in ['-p']:
mpdport = int(arg)
elif opt in ['-u']:
upmpdclitoo = True
elif opt in ['-e']:
externalvolume = True
else:
logerr("unknown option %s\n" % opt)
usage(sys.stderr)
# Temp fifo name and temporary file for mpd configuration
mpdfifo = tempfile.mktemp(suffix=".fifo")
mpdconf = tempfile.NamedTemporaryFile()
# UDN and name for the Sender UPnP device. We use a hash of the
# friendly name and host name
sender_udn = uuid.uuid5(uuid.NAMESPACE_DNS,
socket.gethostname() + upmpdcli_fname).urn
sender_name = "%s UxSender" % upmpdcli_fname
mpdproc = None
senderproc = None
upmpdproc = None
parentpid = os.getppid()
def cleanup(xval):
# Clean up
try:
senderproc.terminate()
except:
pass
try:
mpdproc.terminate()
except:
pass
try:
upmpdproc.terminate()
except:
pass
# MPD normally deletes the fifo. Just in case
try:
os.remove(mpdfifo)
except:
pass
try:
os.remove(mpdconf.name)
except:
pass
sys.exit(xval)
def sighandler(signum, frame):
cleanup(1)
signal.signal(signal.SIGINT, sighandler)
signal.signal(signal.SIGTERM, sighandler)
# MPD configuration in temporary file
if externalvolume:
mixertype = 'null'
else:
mixertype = 'software'
mpdconf_template='''
bind_to_address "localhost"
port "%d"
zeroconf_enabled "no"
input {
plugin "curl"
}
audio_output {
type "fifo"
name "FIFO"
path "%s"
format "44100:16:2"
}
mixer_type "%s"
'''
print(mpdconf_template % (mpdport, mpdfifo, mixertype), file = mpdconf)
mpdconf.flush()
# Start mpd
try:
mpdproc = subprocess.Popen(["mpd", "--no-daemon", "--stderr", mpdconf.name],
bufsize = -1)
except Exception as err:
logerr("Can't start mpd: %s" % err)
cleanup(1)
# Wait for the fifo to appear
while True:
if os.path.exists(mpdfifo):
break
if mpdproc.poll() is not None:
sys.exit(1)
time.sleep(0.1)
# Start the Sender
try:
senderproc = subprocess.Popen([uxsender, "-f", mpdfifo,
"-A", "44100:16:2:1",
"-u", sender_udn, "-n", sender_name],
stdout=subprocess.PIPE,
bufsize = -1)
except Exception as err:
logerr("Can't start %s: %s" % (uxsender, err))
cleanup(1)
# Get the Uri and Metadata values from the sender. These get written to stdout
urimeta = senderproc.stdout.readline()
# Optionally also start an upmpdcli to control the mpd. Not normally
# used (becaue the upmpdcli which is switching to sender mode would do
# it) but handy when developping
if upmpdclitoo:
upname = "upmpdcli-sender-%d"% os.getpid()
try:
upmpdproc = subprocess.Popen(["upmpdcli", "-c", "", "-h", "localhost",
"-p", "%d"%mpdport,
"-f", upname], bufsize = -1)
except Exception as err:
logerr("Can't start upmpdcli: %s" % err)
cleanup(1)
# Tell the world we're set
print("Ok %d %s" % (mpdport, urimeta))
sys.stdout.flush()
# Wait for either process, also checking that our parent is not dead
while True:
if mpdproc.poll() is not None or senderproc.poll() is not None:
break
try:
os.kill(parentpid, 0)
except:
break
time.sleep(0.5)
time.sleep(1)
cleanup(0)