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#! /usr/bin/python
# aseqdump.py -- python port of aplaymidi
# Copyright (C) 2008 Aldrin Martoq <amartoq@dcc.uchile.cl>
#
# Based on code from aseqdump.c, from ALSA project
# Copyright (C) 2005 Clemens Ladisch <clemens@ladisch.de>
#
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import sys
sys.path.insert(0, '../pyalsa')
import getopt
import os
import struct
import alsaseq
import traceback
import time
from alsaseq import *
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 = 'aseqdump.py',
streams = SEQ_OPEN_DUPLEX,
mode = SEQ_BLOCK)
return sequencer
except SequencerError, e:
fatal("open sequencer: %e", e)
def parse_ports(sequencer, portspec):
""" parses one or more port addresses from the string, separated by ','
example: 14:0,Timidity
"""
portlist = []
if portspec == None:
return portlist
ports = portspec.split(',')
for port in ports:
try:
client, port = sequencer.parse_address(port)
portlist.append((client, port))
except SequencerError, e:
fatal("Failed to parse port %s - %s", port, e)
return portlist
def create_source_port(sequencer):
try :
port = sequencer.create_simple_port(name = 'aseqdump.py',
type = SEQ_PORT_TYPE_MIDI_GENERIC
| SEQ_PORT_TYPE_APPLICATION,
caps = SEQ_PORT_CAP_WRITE
| SEQ_PORT_CAP_SUBS_WRITE)
return port
except SequencerError, e:
fatal("Failed to create port - %s", e)
def connect_ports(sequencer, port_id, ports):
client_id = sequencer.client_id
for client, port in ports:
sequencer.connect_ports((client, port),(client_id, port_id))
def dump_event(event):
print "%3d:%-3d" % ((event.source)[0], (event.source)[1]),
type = event.type
data = event.get_data()
if type == SEQ_EVENT_NOTEON:
print "Note on %2d %3d %3d" % \
(data['note.channel'], data['note.note'], data['note.velocity'])
elif type == SEQ_EVENT_NOTEOFF:
print "Note off %2d %3d %3d" % \
(data['note.channel'], data['note.note'], data['note.velocity'])
elif type == SEQ_EVENT_KEYPRESS:
print "Polyphonic aftertouch %2d %3d %3d" % \
(data['note.channel'], data['note.note'], data['note.velocity'])
elif type == SEQ_EVENT_CONTROLLER:
print "Control change %2d %3d %3d" % \
(data['control.channel'], data['control.param'], data['control.value'])
elif type == SEQ_EVENT_PGMCHANGE:
print "Program change %2d %3d" % \
(data['control.channel'], data['control.value'])
else:
print "Event type %d" % type
def list_ports():
sequencer = init_seq()
print " Port Client name Port name";
clientports = sequencer.connection_list()
for connections in clientports:
clientname, clientid, connectedports = connections
for port in connectedports:
portname, portid, connections = port
portinfo = sequencer.get_port_info(portid, clientid)
caps = portinfo['capability']
if caps & (SEQ_PORT_CAP_READ | SEQ_PORT_CAP_SUBS_READ):
print "%3d:%-3d %-32.32s %s" % (clientid, portid, clientname, portname)
def usage():
print "Usage: %s [options]\n" \
"\nAvailable options:\n" \
"-h, --help this help\n" \
"-V, --version show version\n" \
"-l, --list list input ports\n" \
"-p, --port=client:port,... source port(s)\n" \
% (sys.argv[0])
def version():
print "aseqdump.py asoundlib version %s" % (SEQ_LIB_VERSION_STR)
def main():
sequencer = init_seq()
ports = []
end_delay = 2
try:
opts, args = getopt.getopt(sys.argv[1:], "hVlp:", ["help", "version", "list", "port="])
except getopt.GetoptError:
usage()
sys.exit(2)
for o, a in opts:
if o in ("-h", "--help"):
usage()
sys.exit(0)
elif o in ("-V", "--version"):
version()
sys.exit(0)
elif o in ("-l", "--list"):
list_ports()
sys.exit(0)
elif o in ("-p", "--port"):
ports = parse_ports(sequencer, a)
elif o in ("-d", "--delay"):
end_delay = int(a)
source_port = create_source_port(sequencer)
connect_ports(sequencer, source_port, ports)
sequencer.mode = SEQ_NONBLOCK
if len(ports) > 0:
print "Waiting for data.",
else:
print "Waiting for data at port %d:0." % sequencer.client_id,
print "Press Ctrl+C to end."
print "Source_ Event_________________ Ch _Data__"
while True:
try:
eventlist = sequencer.receive_events(timeout=10069, maxevents = 1)
for event in eventlist:
dump_event(event)
except KeyboardInterrupt:
pass
break
if __name__ == '__main__':
main()
|
