def message_rcvd(bus, message, pipeline, resolution):
t = message.type
if t == gst.MESSAGE_STATE_CHANGED:
if message.src == pipeline:
old, new, pending = message.parse_state_changed()
if new == gst.STATE_PLAYING:
run_check(pipeline, resolution)
elif t == gst.MESSAGE_ERROR:
gerror, debug = message.parse_error()
# set pipeline state to NULL so worker does not consume
# unnecessary resources
pipeline.set_state(gst.STATE_NULL)
resolution.errback(
errors.GStreamerGstError(message.src, gerror, debug))
elif t == gst.MESSAGE_EOS:
resolution.errback(
errors.GStreamerError("Unexpected end of stream"))
else:
log.debug(
'check', 'message: %s: %s:' %
(message.src.get_path_string(), message.type.value_nicks[1]))
if message.structure:
log.debug('check',
'message: %s' % message.structure.to_string())
else:
log.debug('check', 'message: (no structure)')
return True
def do_check(demux):
pad = demux.get_pad('video')
if not pad or pad.get_negotiated_caps() == None:
raise errors.GStreamerError('Pipeline failed to negotiate?')
caps = pad.get_negotiated_caps()
s = caps.get_structure(0)
w = s['width']
h = s['height']
par = s['pixel-aspect-ratio']
# FIXME: not a good idea to reuse the result name which
# also exists in the parent context.
# pychecker should warn; however it looks like
# the parent result doesn't get stored as name,
# but instead with STORE_DEREF
result = dict(width=w, height=h, par=(par.num, par.denom))
log.debug('check', 'returning dict %r' % result)
return result
(message.src.get_path_string(), message.type.value_nicks[1]))
if message.structure:
log.debug('check',
'message: %s' % message.structure.to_string())
else:
log.debug('check', 'message: (no structure)')
return True
resolution = BusResolution()
log.debug('check', 'parsing pipeline %s' % pipeline_str)
try:
pipeline = gst.parse_launch(pipeline_str)
log.debug('check', 'parsed pipeline %s' % pipeline_str)
except gobject.GError, e:
resolution.errback(errors.GStreamerError(e.message))
return resolution.d
bus = pipeline.get_bus()
bus.add_signal_watch()
signal_id = bus.connect('message', message_rcvd, pipeline, resolution)
resolution.signal_id = signal_id
resolution.pipeline = pipeline
log.debug('check', 'setting state to playing')
if set_state_deferred:
d = deferToThread(pipeline.set_state, gst.STATE_PLAYING)
def stateChanged(res):
return resolution.d