def segment_numbers(self):
"""
yield the segment number and when it will be available
There are two cases for segment number generation, static and dynamic.
In the case of static stream, the segment number starts at the startNumber and counts
up to the number of segments that are represented by the periods duration.
In the case of dynamic streams, the segments should appear at the specified time
in the simplest case the segment number is based on the time since the availabilityStartTime
:return:
"""
log.debug(
"Generating segment numbers for {0} playlist (id={1})".format(
self.root.type, self.parent.id))
if self.root.type == u"static":
available_iter = repeat(epoch_start)
duration = self.period.duration.seconds or self.root.mediaPresentationDuration.seconds
if duration:
number_iter = range(self.startNumber,
int(duration / self.duration_seconds) + 1)
else:
number_iter = count(self.startNumber)
else:
now = datetime.datetime.now(utc)
if self.presentationTimeOffset:
since_start = (now - self.presentationTimeOffset
) - self.root.availabilityStartTime
available_start_date = self.root.availabilityStartTime + self.presentationTimeOffset + since_start
available_start = available_start_date
else:
since_start = now - self.root.availabilityStartTime
available_start = now
# if there is no delay, use a delay of 3 seconds
suggested_delay = datetime.timedelta(
seconds=(self.root.suggestedPresentationDelay.total_seconds(
) if self.root.suggestedPresentationDelay else 3))
# the number of the segment that is available at NOW - SUGGESTED_DELAY - BUFFER_TIME
number_iter = count(self.startNumber +
int((since_start - suggested_delay -
self.root.minBufferTime).total_seconds() /
self.duration_seconds))
# the time the segment number is available at NOW
available_iter = count_dt(
available_start,
step=datetime.timedelta(seconds=self.duration_seconds))
for number, available_at in izip(number_iter, available_iter):
yield number, available_at
def segment_numbers(self):
"""
yield the segment number and when it will be available
There are two cases for segment number generation, static and dynamic.
In the case of static stream, the segment number starts at the startNumber and counts
up to the number of segments that are represented by the periods duration.
In the case of dynamic streams, the segments should appear at the specified time
in the simplest case the segment number is based on the time since the availabilityStartTime
:return:
"""
log.debug("Generating segment numbers for {0} playlist (id={1})".format(self.root.type, self.parent.id))
if self.root.type == u"static":
available_iter = repeat(epoch_start)
duration = self.period.duration.seconds or self.root.mediaPresentationDuration.seconds
if duration:
number_iter = range(self.startNumber, int(duration / self.duration_seconds) + 1)
else:
number_iter = count(self.startNumber)
else:
now = datetime.datetime.now(utc)
if self.presentationTimeOffset:
since_start = (now - self.presentationTimeOffset) - self.root.availabilityStartTime
available_start_date = self.root.availabilityStartTime + self.presentationTimeOffset + since_start
available_start = available_start_date
else:
since_start = now - self.root.availabilityStartTime
available_start = now
# if there is no delay, use a delay of 3 seconds
suggested_delay = datetime.timedelta(seconds=(self.root.suggestedPresentationDelay.total_seconds()
if self.root.suggestedPresentationDelay
else 3))
# the number of the segment that is available at NOW - SUGGESTED_DELAY - BUFFER_TIME
number_iter = count(self.startNumber +
int((since_start - suggested_delay - self.root.minBufferTime).total_seconds() /
self.duration_seconds))
# the time the segment number is available at NOW
available_iter = count_dt(available_start,
step=datetime.timedelta(seconds=self.duration_seconds))
for number, available_at in izip(number_iter, available_iter):
yield number, available_at
