class FLVPlayer(Player):
""" Reads a FLV stream and emulates playout by advancing the stream as time passes """
FILE_HEADER_SIZE = 9
TAG_HEADER_SIZE = 15
def __init__(self):
Player.__init__(self)
self._lastAudioTS = 0
self._lastVideoTS = 0
self.flv = FLV(self)
def feed(self, data):
""" input downloaded media data here piece by piece """
self.put(data)
# nothing parsed yet
if self.tell() == 0:
self.changeState(PlayerState.BUFFERING)
if self.availBytes() >= self.FILE_HEADER_SIZE:
self.flv.parse_header()
else:
tag = 0
while tag != None:
avail = self.availBytes()
tag = None
if avail >= self.TAG_HEADER_SIZE:
# peek for tag size
tag_type = get_ui8(self)
tag_size = get_ui24(self)
# log.debug("peek: %02X %u, available: %u" % (tag_type,tag_size,avail))
self.seek(-4, os.SEEK_CUR)
# size + next header size
if avail >= tag_size + self.TAG_HEADER_SIZE:
tag = self.flv.get_next_tag()
if type(tag) == VideoTag:
self._lastVideoTS = tag.timestamp
# log.debug("lastVideo: %u", self._lastVideoTS)
elif type(tag) == AudioTag:
self._lastAudioTS = tag.timestamp
# log.debug("lastAudio: %u", self._lastAudioTS)
super(FLVPlayer, self).feed(data)
def getLastMediaTimeStamp(self):
""" get the presentation TS of the last complete frame """
raise NotImplementedException()
return min(self._lastVideoTS, self._lastAudioTS) / 1000.0
def getBufferedSeconds(self, offset = 0):
""" until when the buffer contains media """
return (min(self._lastVideoTS, self._lastAudioTS) / 1000.0) - offset
def __str__(self):
return ' FLVPlayer(unparsed bytes: %d, last A/V TS: %u/%u)' % \
(self.availBytes(), self._lastAudioTS, self._lastVideoTS)
