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from . import Stream, StreamError
from ..utils import urlget
from time import time, sleep
import re
try:
from Crypto.Cipher import AES
import struct
def num_to_iv(n):
return struct.pack(">8xq", n)
CAN_DECRYPT = True
except ImportError:
CAN_DECRYPT = False
def parse_m3u_attributes(data):
attr = re.findall("([A-Z\-]+)=(\d+\.\d+|0x[0-9A-z]+|\d+x\d+|\d+|\"(.+)\"|[0-9A-z\-]+)", data)
rval = {}
for key, val, strval in attr:
if len(strval) > 0:
rval[key] = strval
else:
rval[key] = val
if len(rval) > 0:
return rval
return data
def parse_m3u_tag(data):
key = data[1:]
value = None
valpos = data.find(":")
if valpos > 0:
key = data[1:valpos]
value = data[valpos+1:]
return (key, value)
def parse_m3u(data):
lines = [line for line in data.splitlines() if len(line) > 0]
tags = {}
entries = []
lasttag = None
for i, line in enumerate(lines):
if line.startswith("#EXT"):
(key, value) = parse_m3u_tag(line)
if value is not None:
if key == "EXTINF":
duration, title = value.split(",")
value = (float(duration), title)
else:
value = parse_m3u_attributes(value)
tags[key] = value
lasttag = (key, value)
else:
entry = { "url": line, "tag": lasttag }
entries.append(entry)
return (tags, entries)
class HLSStream(Stream):
def __init__(self, session, url):
Stream.__init__(self, session)
self.url = url
self.playlist = {}
self.playlist_reload_time = 0
self.playlist_minimal_reload_time = 15
self.playlist_end = False
self.entry = None
self.decryptor = None
self.decryptor_key = None
self.decryptor_iv = None
self.fd = None
self.sequence = 0
self.logger = session.logger.new_module("stream.hls")
def open(self):
return self
def read(self, size=-1):
if self.entry is None:
try:
self._next_entry()
except IOError:
return b""
data = self.fd.read(size)
if len(data) == 0:
self._next_entry()
return self.read(size)
if self.decryptor:
data = self.decryptor.decrypt(data)
return data
def _next_entry(self):
if len(self.playlist) == 0:
self._reload_playlist()
# Periodic reload is not fatal if it fails
elapsed = time() - self.playlist_reload_time
if elapsed > self.playlist_minimal_reload_time:
try:
self._reload_playlist()
except IOError:
pass
if not self.sequence in self.playlist:
if self.playlist_end:
# Last playlist is over
raise IOError("End of stream")
else:
self.logger.debug("Next sequence not available yet")
sleep(1)
return self._next_entry()
self.entry = self.playlist[self.sequence]
self.logger.debug("Next entry: {0}", self.entry)
res = urlget(self.entry["url"], prefetch=False,
exception=IOError)
self.playlist[self.sequence] = None
if self.decryptor_key:
if not self.decryptor_iv:
iv = num_to_iv(self.sequence)
else:
iv = num_to_iv(self.decryptor_iv)
self.decryptor = AES.new(self.decryptor_key, AES.MODE_CBC, iv)
self.fd = res.raw
self.sequence += 1
def _reload_playlist(self):
if self.playlist_end:
return
self.logger.debug("Reloading playlist")
res = urlget(self.url, exception=IOError)
(tags, entries) = parse_m3u(res.text)
if "EXT-X-ENDLIST" in tags:
self.playlist_end = True
if "EXT-X-MEDIA-SEQUENCE" in tags:
sequence = int(tags["EXT-X-MEDIA-SEQUENCE"])
else:
sequence = 0
if "EXT-X-KEY" in tags and tags["EXT-X-KEY"]["METHOD"] != "NONE":
if not CAN_DECRYPT:
self.logger.error("Need pyCrypto installed to decrypt data")
raise IOError
if tags["EXT-X-KEY"]["METHOD"] != "AES-128":
self.logger.error("Unable to decrypt cipher {0}", tags["EXT-X-KEY"]["METHOD"])
raise IOError
if not "URI" in tags["EXT-X-KEY"]:
self.logger.error("Missing URI to decryption key")
raise IOError
res = urlget(tags["EXT-X-KEY"]["URI"], exception=IOError)
self.decryptor_key = res.content
for i, entry in enumerate(entries):
self.playlist[sequence + i] = entry
if entry["tag"][0] == "EXTINF":
duration = entry["tag"][1][0]
self.playlist_minimal_reload_time = duration
if self.sequence == 0:
self.sequence = sequence
self.playlist_reload_time = time()
@classmethod
def parse_variant_playlist(cls, session, url):
res = urlget(url, exception=IOError)
streams = {}
(tags, entries) = parse_m3u(res.text)
for entry in entries:
(tag, value) = entry["tag"]
if tag != "EXT-X-STREAM-INF":
continue
if not "RESOLUTION" in value:
continue
quality = value["RESOLUTION"].split("x")[1] + "p"
stream = HLSStream(session, entry["url"])
streams[quality] = stream
return streams
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