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#! /usr/bin/python
# aconnect.py -- python port of aconnect
# Copyright (C) 2008 Aldrin Martoq <amartoq@dcc.uchile.cl>
#
# Based on code from aconnect.c from ALSA project
# Copyright (C) 1999 Takashi Iwai
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import sys
sys.path.insert(0, '../pyalsa')
import getopt
import os
from alsaseq import *
LIST_INPUT=1
LIST_OUTPUT=2
def errormsg(msg, *args):
""" prints an error message to stderr """
sys.stderr.write(msg % args)
sys.stderr.write('\n')
traceback.print_exc(file=sys.stderr)
def fatal(msg, *args):
""" prints an error message to stderr, and dies """
errormsg(msg, *args)
sys.exit(1)
def init_seq():
""" opens an alsa sequencer """
try:
sequencer = Sequencer(name = 'default',
clientname = 'aconnect.py',
streams = SEQ_OPEN_DUPLEX,
mode = SEQ_BLOCK)
return sequencer
except SequencerError, e:
fatal("open sequencer: %e", e)
def usage():
print \
"aconnect - python ALSA sequencer connection manager\n" \
"Copyright (C) 1999-2000 Takashi Iwai\n" \
"Copyright (C) 2008 Aldrin Martoq <amartoq@dcc.uchile.cl>\n" \
"Usage: \n" \
" * Connection/disconnection between ports\n" \
" %s [-options] sender receiver\n" \
" sender, receiver = client:port pair\n" \
" -d,--disconnect disconnect\n" \
" -e,--exclusive exclusive connection\n" \
" -r,--real # convert real-time-stamp on queue\n" \
" -t,--tick # convert tick-time-stamp on queue\n" \
" * List connected ports (no subscription action)\n" \
" %s -i|-o [-options]\n" \
" -i,--input list input (readable) ports\n" \
" -o,--output list output (writable) ports\n" \
" -l,--list list current connections of each port\n" \
" * Remove all exported connections\n" \
" -x,--removeall" \
% (sys.argv[0], sys.argv[0])
def do_list_subs(conn, text):
l = []
for c, p, i in conn:
s = ""
if i['exclusive']:
s+= "[ex]"
if i['time_update']:
if i['time_real']:
s += "[%s:%s]" % ("real", i['queue'])
else:
s += "[%s:%s]" % ("tick", i['queue'])
s = "%d:%d%s" % (c, p, s)
l.append(s)
if len(l):
print "\t%s: %s" % (text, ', '.join(l))
def do_list_ports(sequencer, list_perm, list_subs):
connectionlist = sequencer.connection_list()
for connections in connectionlist:
clientname, clientid, connectedports = connections
clientinfo = sequencer.get_client_info(clientid)
type = clientinfo['type']
count = []
if type == SEQ_USER_CLIENT:
type = 'user'
else:
type = 'kernel'
for port in connectedports:
portname, portid, portconns = port
portinfo = sequencer.get_port_info(portid, clientid)
caps = portinfo['capability']
if not (caps & SEQ_PORT_CAP_NO_EXPORT):
reads = SEQ_PORT_CAP_READ | SEQ_PORT_CAP_SUBS_READ
write = SEQ_PORT_CAP_WRITE | SEQ_PORT_CAP_SUBS_WRITE
if (list_perm & LIST_INPUT) and (caps & reads == reads):
count.append(port)
elif (list_perm & LIST_OUTPUT) and (caps & write == write):
count.append(port)
if len(count) > 0:
print "client %d: '%s' [type=%s]" % (clientid, clientname, type)
for port in count:
portname, portid, portconns = port
print " %3d '%-16s'" % (portid, portname)
if list_subs:
readconn, writeconn = portconns
do_list_subs(readconn, "Connecting To")
do_list_subs(writeconn, "Connected From")
def do_unsubscribe(sequencer, args):
sender = sequencer.parse_address(args[0])
dest = sequencer.parse_address(args[1])
try:
sequencer.get_connect_info(sender, dest)
except SequencerError:
print 'No subscription is found'
return
try:
sequencer.disconnect_ports(sender, dest)
except SequencerError, e:
fatal("Failed to disconnect ports %s->%s - %s", sender, dest, e)
def do_subscribe(sequencer, args, queue, exclusive, convert_time, convert_real):
sender = sequencer.parse_address(args[0])
dest = sequencer.parse_address(args[1])
try:
sequencer.get_connect_info(sender, dest)
print "Connection is already subscribed"
return
except SequencerError:
pass
sequencer.connect_ports(sender, dest, queue, exclusive, convert_time, convert_real)
def main():
sequencer = init_seq()
command = 'subscribe'
list_perm = 0
list_subs = 0
exclusive = 0
convert_time = 0
convert_real = 0
queue = 0
try:
opts, args = getopt.getopt(sys.argv[1:], "dior:t:elx", ["disconnect", "input", "output", "real=", "tick=", "exclusive", "list", "removeall"])
except getopt.GetoptError:
usage()
sys.exit(2)
for o, a in opts:
if o in ("-d", "--disconnect"):
command = 'unsubscribe'
elif o in ("-i", "--input"):
command = 'list'
list_perm |= LIST_INPUT
elif o in ("-o", "--output"):
command = 'list'
list_perm |= LIST_OUTPUT
elif o in ("-e", "--exclusive"):
exclusive = 1
elif o in ("-r", "--real"):
queue = int(a)
convert_time = 1
convert_real = 1
elif o in ("-t", "--tick"):
queue = int(a)
convert_time = 1
convert_real = 0
elif o in ("-l", "--list"):
list_subs = 1
elif o in ("-x", "--removeall"):
command = 'removeall'
if command == 'list':
do_list_ports(sequencer, list_perm, list_subs)
return
if len(args) != 2:
usage()
sys.exit(2)
if command == 'unsubscribe':
do_unsubscribe(sequencer, args)
elif command == 'subscribe':
do_subscribe(sequencer, args, queue, exclusive, convert_time, convert_real)
if __name__ == '__main__':
main()
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