gstreamer/examples/gst123

#!/usr/bin/env python
# -*- Mode: python -*-

import getopt
import sys

import gst

"""Usage: gst123 [<options>] <input file> ...
 
  -h, --help           this help
  -V, --version        display gst123 version
  -d, --device=d       uses 'd' as an output device
                       Possible devices are ('*'=live, '@'=file):
                         null* wav@ raw@ au@ arts* esd* oss*
  -f, --file=filename  Set the output filename for a previously
                       specified file device (with -d).
  -k n, --skip n       Skip the first 'n' seconds
  -b n, --buffer n     use an input buffer of 'n' kilobytes
  -v, --verbose        display progress and other status information
  -q, --quiet          don't display anything (no title)
  -z, --shuffle        shuffle play"""

def found_tags_cb(element, source, tags):
    for tag in tags.keys():
        if tag in ['title', 'artist', 'genre', 'album']:
            ntag = tag[0].upper() + tag[1:] + ':'
            print '%-8s %s' % (ntag, tags[tag])
        
def error_cb(bin, element, error, debug):
    print error
    raise SystemExit

def pad_notify_caps_cb(pad, arg):
    caps = pad.get_negotiated_caps()
    
    if not caps:
        return
    
    for structure in caps:
        print 'Bitstream is %(channels)d channel(s), %(rate)dHz' % structure

def playfile(filename):
    bin = gst.Thread('player')
    bin.connect('eos', lambda bin: gst.main_quit())
    bin.connect('error', error_cb)
    
    source = gst.element_factory_make('filesrc', 'src')
    source.set_property('location', filename)

    spider = gst.element_factory_make('spider', 'spider')
    spider.connect('found-tag', found_tags_cb)
    
    sink = gst.element_factory_make('osssink', 'sink')
    #sink.set_property('release-device', 1)
    pad = sink.get_pad('sink')
    pad.connect('notify::caps', pad_notify_caps_cb)
    
    bin.add_many(source, spider, sink)
    if not gst.element_link_many(source, spider, sink):
        print "ERROR: could not link"
        sys.exit(1)

    print 'Playing:', filename
    if not bin.set_state(gst.STATE_PLAYING):
        print "ERROR: could not set bin to playing"
        sys.exit(1)

    while 1:
        try:
            if not gst.main():
                break
        except KeyboardInterrupt:
            if not bin.set_state(gst.STATE_PAUSED):
                print "ERROR: could not set bin to paused"
                sys.exit(1)
            sys.stdout.write("Paused.  Press Enter to go back to playing.")
            sys.stdout.flush()
            try:
                sys.stdin.readline()
                if not bin.set_state(gst.STATE_PLAYING):
                    print "ERROR: could not set bin to playing"
                    sys.exit(1)
                print "Playing."
            except KeyboardInterrupt:
                print
                break

    bin.set_state(gst.STATE_NULL)
    
def main(args):
    if len(args) > 2:
        print 'usage: gst123 files...'
        return 2
    
    args2, opt = getopt.getopt(args[1:], 'b:d:f:hk:vVqz',
                              ['help', 'version', 'device=',
                               'file=', 'skip=', 'buffer=',
                               'verbose', 'quiet', 'shuffle'])
    for arg in args[1:]:
        try:
            playfile(arg)
        except KeyboardInterrupt:
            raise SystemExit

if __name__ == '__main__':
    sys.exit(main(sys.argv))


for i in range(10, 20, 1):
    pass