def get_uri(source):
"""
Check a media source as a valid file or uri and return the proper uri
"""
import gst
# Is this an valid URI source
if gst.uri_is_valid(source):
uri_protocol = gst.uri_get_protocol(source)
if gst.uri_protocol_is_supported(gst.URI_SRC, uri_protocol):
return source
else:
raise IOError('Invalid URI source for Gstreamer')
# is this a file?
import os.path
if os.path.exists(source):
# get the absolute path
pathname = os.path.abspath(source)
# and make a uri of it
uri = path2uri(pathname)
return get_uri(uri)
else:
raise IOError('Failed getting uri for path %s: not such file or directoy' % source)
return uri
def _analyze(self):
"""
Sets up a pipeline to analyze the given uri
"""
self.current_uri = self.queue[0]
self.info("Analyzing %s", self.current_uri)
# check if file exists and is readable
if gst.uri_get_protocol(self.current_uri) == "file":
filename = gst.uri_get_location(self.current_uri)
error = None
if not os.access(filename, os.F_OK):
error = _("File does not exist")
elif not os.access(filename, os.R_OK):
error = _("File not readable by current user")
if error:
self.info("Error: %s", self.error)
self.error = error
self._finishAnalysis(
"File does not exist or is not readable by the current user"
)
return False
# setup graph and start analyzing
self.pipeline = gst.Pipeline("Discoverer-%s" % self.current_uri)
# create the source element
source = self._createSource()
if source is None:
self._finishAnalysis("no source")
return False
# create decodebin(2)
dbin = self._createDecodeBin()
self.pipeline.add(source, dbin)
source.link(dbin)
self.info("analysis pipeline created")
# connect to bus messages
self._connectToBus()
self.info("setting pipeline to PAUSED")
# go to PAUSED
if self.pipeline.set_state(
gst.STATE_PAUSED) == gst.STATE_CHANGE_FAILURE:
if not self.error:
self.error = _("Pipeline didn't want to go to PAUSED.")
self.info("Pipeline didn't want to go to PAUSED")
self._finishAnalysis("failure going to PAUSED")
return False
self._scheduleTimeout()
# return False so we don't get called again
return False
def uri_is_valid(uri):
"""Checks if the given uri is a valid uri (of type file://)
Will also check if the size is valid (> 0).
@param uri: The location to check
@type uri: C{URI}
"""
return (gst.uri_is_valid(uri) and gst.uri_get_protocol(uri) == "file"
and len(os.path.basename(gst.uri_get_location(uri))) > 0)
def _analyze(self):
"""
Sets up a pipeline to analyze the given uri
"""
self.current_uri = self.queue[0]
self.info("Analyzing %s", self.current_uri)
# check if file exists and is readable
if gst.uri_get_protocol(self.current_uri) == "file":
filename = gst.uri_get_location(self.current_uri)
error = None
if not os.access(filename, os.F_OK):
error = _("File does not exist")
elif not os.access(filename, os.R_OK):
error = _("File not readable by current user")
if error:
self.info("Error: %s", self.error)
self.error = error
self._finishAnalysis("File does not exist or is not readable by the current user")
return False
# setup graph and start analyzing
self.pipeline = gst.Pipeline("Discoverer-%s" % self.current_uri)
# create the source element
source = self._createSource()
if source is None:
self._finishAnalysis("no source")
return False
# create decodebin(2)
dbin = self._createDecodeBin()
self.pipeline.add(source, dbin)
source.link(dbin)
self.info("analysis pipeline created")
# connect to bus messages
self._connectToBus()
self.info("setting pipeline to PAUSED")
# go to PAUSED
if self.pipeline.set_state(gst.STATE_PAUSED) == gst.STATE_CHANGE_FAILURE:
if not self.error:
self.error = _("Pipeline didn't want to go to PAUSED.")
self.info("Pipeline didn't want to go to PAUSED")
self._finishAnalysis("failure going to PAUSED")
return False
self._scheduleTimeout()
# return False so we don't get called again
return False
def uri_is_valid(uri):
"""Checks if the given uri is a valid uri (of type file://)
Will also check if the size is valid (> 0).
@param uri: The location to check
@type uri: C{URI}
"""
return (gst.uri_is_valid(uri) and
gst.uri_get_protocol(uri) == "file" and
len(os.path.basename(gst.uri_get_location(uri))) > 0)
def _createSource(self):
source = gst.element_make_from_uri(gst.URI_SRC, self.current_uri, "src-%s" % self.current_uri)
if not source:
self.warning("This is not a media file: %s", self.current_uri)
self.error = _("No available source handler.")
self.error_detail = _(
'You do not have a GStreamer source element to handle the "%s" protocol'
) % gst.uri_get_protocol(self.current_uri)
return None
# increment source blocksize to 128kbytes, this should speed up
# push-mode scenarios (like pictures).
if hasattr(source.props, "blocksize"):
source.props.blocksize = 131072
return source
def _createSource(self):
source = gst.element_make_from_uri(gst.URI_SRC, self.current_uri,
"src-%s" % self.current_uri)
if not source:
self.warning("This is not a media file: %s", self.current_uri)
self.error = _("No available source handler.")
self.error_detail = _(
"You do not have a GStreamer source element to handle protocol '%s'"
) % gst.uri_get_protocol(self.current_uri)
return None
# increment source blocksize to 128kbytes, this should speed up
# push-mode scenarios (like pictures).
if hasattr(source.props, 'blocksize'):
source.props.blocksize = 131072
return source
def get_uri(source):
"""
Check a media source as a valid file or uri and return the proper uri
"""
import gst
src_info = source_info(source)
if src_info['is_file']: # Is this a file?
return get_uri(src_info['uri'])
elif gst.uri_is_valid(source): # Is this a valid URI source for Gstreamer
uri_protocol = gst.uri_get_protocol(source)
if gst.uri_protocol_is_supported(gst.URI_SRC, uri_protocol):
return source
else:
raise IOError('Invalid URI source for Gstreamer')
else:
raise IOError('Failed getting uri for path %s: no such file' % source)
def get_uri(source):
"""
Check a media source as a valid file or uri and return the proper uri
"""
import gst
src_info = source_info(source)
if src_info['is_file']: # Is this a file?
return get_uri(src_info['uri'])
elif gst.uri_is_valid(source): # Is this a valid URI source for Gstreamer
uri_protocol = gst.uri_get_protocol(source)
if gst.uri_protocol_is_supported(gst.URI_SRC, uri_protocol):
return source
else:
raise IOError('Invalid URI source for Gstreamer')
else:
raise IOError('Failed getting uri for path %s: no such file' % source)
