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upids.py
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upids.py
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"""
threefive/upids.py
threefve.upids
"""
charset = "ascii"
"""
set charset to None to return raw bytes
"""
charset = "ascii"
class UpidDecoder:
"""
UpidDecoder for use by the
SegmentationDescriptor class.
"""
def __init__(self, bitbin, upid_type, upid_length):
self.bitbin = bitbin
self.upid_type = upid_type
self.upid_length = upid_length
self.bit_length = upid_length << 3
def _decode_air_id(self):
return self.bitbin.as_hex(self.bit_length)
def _decode_atsc(self):
cont_size = self.bit_length - 32
return {
"TSID": self.bitbin.as_int(16),
"reserved": self.bitbin.as_int(2),
"end_of_day": self.bitbin.as_int(5),
"unique_for": self.bitbin.as_int(9),
"content_id": self.bitbin.as_charset(cont_size,charset)
}
def _decode_eidr(self):
if self.upid_length != 12:
return f"upid_length is {self.upid_length} should be 12 bytes."
pre = self.bitbin.as_int(16)
post = []
bit_count = 80
while bit_count:
bit_count -= 16
post.append(self.bitbin.as_hex(16)[2:])
return f"10.{pre}/{'-'.join(post)}"
def _decode_isan(self):
return self.bitbin.as_hex(self.bit_length)
def _decode_mid(self):
upids = []
ulb = self.bit_length
while ulb:
upid_type = self.bitbin.as_int(8) # 1 byte
ulb -= 8
upid_length = self.bitbin.as_int(8)
ulb -= 8
upid_type_name, segmentation_upid = UpidDecoder(
self.bitbin, upid_type, upid_length
).decode()
mid_upid = {
"upid_type": upid_type,
"upid_type_name": upid_type_name,
"upid_length": upid_length,
"segmentation_upid": segmentation_upid,
}
ulb -= upid_length << 3
upids.append(mid_upid)
return upids
def _decode_mpu(self):
mpu_data = {
"format_identifier": self.bitbin.as_int(32),
"private_data": self.bitbin.as_hex(self.bit_length - 32),
}
return mpu_data
def _decode_umid(self):
chunks = []
ulb = self.bit_length
while ulb > 32:
chunks.append(self.bitbin.as_hex(32)[2:])
ulb -= 32
return ".".join(chunks)
def _decode_uri(self):
return self.bitbin.as_charset(self.bit_length, charset)
def _decode_no(self):
return None
def decode(self):
"""
decode returns a upid determined by
self.upid_type and upid_map below.
"""
upid_map = {
0x00: ["No UPID", self._decode_no],
0x01: ["Deprecated", self._decode_uri],
0x02: ["Deprecated", self._decode_uri],
0x03: ["AdID", self._decode_uri],
0x04: ["UMID", self._decode_umid],
0x05: ["ISAN", self._decode_isan],
0x06: ["ISAN", self._decode_isan],
0x07: ["TID", self._decode_uri],
0x08: ["AiringID", self._decode_air_id],
0x09: ["ADI", self._decode_uri],
0x10: ["UUID", self._decode_uri],
0x11: ["SCR", self._decode_uri],
0x0A: ["EIDR", self._decode_eidr],
0x0B: ["ATSC", self._decode_atsc],
0x0C: ["MPU", self._decode_mpu],
0x0D: ["MID", self._decode_mid],
0x0E: ["ADS Info", self._decode_uri],
0x0F: ["URI", self._decode_uri],
0xFD: ["Unknown", self._decode_uri],
}
if self.upid_type not in upid_map:
self.upid_type = 0xFD
if not self.upid_length:
self.upid_type = 0x00
upid_name = upid_map[self.upid_type][0]
upid_value = upid_map[self.upid_type][1]()
return upid_name, upid_value
def upid_encoder(nbin, upid_type, upid_length, seg_upid):
"""
upid_encoder
encodes segmentation_upid values to bites
added to the nbin instance.
Used by the SegmentationDescriptor class.
"""
upid_map = {
0x00: ["No UPID", _encode_no],
0x01: ["Deprecated", _encode_uri],
0x02: ["Deprecated", _encode_uri],
0x03: ["AdID", _encode_uri],
0x04: ["UMID", _encode_umid],
0x07: ["TID", _encode_uri],
0x0B: ["ATSC", _encode_atsc],
0x09: ["ADI", _encode_uri],
0x10: ["UUID", _encode_uri],
0x11: ["SCR", _encode_uri],
0x0A: ["EIDR", _encode_eidr],
0x0C: ["MPU", _encode_mpu],
0x0D: ["MID", _encode_mid],
0x0E: ["ADS Info", _encode_uri],
0x0F: ["URI", _encode_uri],
}
if upid_type in upid_map:
upid_map[upid_type][1](nbin, seg_upid)
upid_map_too = {
0x05: ["ISAN", _encode_isan],
0x06: ["ISAN", _encode_isan],
0x08: ["AiringID", _encode_air_id],
}
if upid_type in upid_map_too:
upid_map_too[upid_type][1](nbin, seg_upid, upid_length)
def _encode_air_id(nbin, seg_upid, upid_length):
nbin.add_hex(seg_upid, (upid_length << 3))
def _encode_atsc(nbin, seg_upid):
nbin.add_int(seg_upid["TSID"], 16)
nbin.add_int(seg_upid["reserved"], 2)
nbin.add_int(seg_upid["end_of_day"], 5)
nbin.add_int(seg_upid["unique_for"], 9)
nbin.add_bites(seg_upid["content_id"].encode("utf-8"))
def _encode_eidr(nbin, seg_upid):
pre, post = seg_upid[3:].split("/", 1)
nbin.add_int(int(pre), 16)
nbin.add_hex(post.replace("-", ""), 80)
def _encode_isan(nbin, seg_upid, upid_length):
nbin.add_hex(seg_upid, (upid_length << 3))
def _encode_mid(nbin, seg_upid):
for mid_upid in seg_upid:
nbin.add_int(mid_upid["upid_type"], 8)
nbin.add_int(mid_upid["upid_length"], 8)
upid_encoder(
nbin,
mid_upid["upid_type"],
mid_upid["upid_length"],
mid_upid["segmentation_upid"],
)
def _encode_mpu(nbin, seg_upid):
nbin.add_int(seg_upid["format_identifier"], 32)
nbin.add_hex(seg_upid["private_data"])
def _encode_no(nbin, seg_upid):
nbin.forward(0)
def _encode_umid(nbin, seg_upid):
chunks = seg_upid.split(".")
for chunk in chunks:
nbin.add_hex(chunk, 32)
def _encode_uri(nbin, seg_upid):
if len(seg_upid) > 0:
seg_upid = seg_upid.encode()
nbin.add_bites(seg_upid)