/usr/lib/python2.7/dist-packages/librtmp/amf.py is in python-librtmp 0.3.0-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from functools import singledispatch
except ImportError:
from singledispatch import singledispatch
from . import ffi, librtmp
from .aval import AVal
from .compat import is_py2, bytes, range
from .exceptions import AMFError
AMF_STRING_TYPES = (librtmp.AMF_STRING, librtmp.AMF_LONG_STRING)
AMF_OBJECT_DICT_TYPES = (librtmp.AMF_OBJECT, librtmp.AMF_ECMA_ARRAY)
__all__ = ["AMFObject", "decode_amf", "encode_amf"]
class AMFObject(dict):
pass
def _create_buffer(size):
pbuf = ffi.new("char[]", size)
pend = pbuf + size
buf = ffi.buffer(pbuf, size)
return pbuf, pend, buf
def _encode_key_name(key):
key = bytes(key, "utf8")
key_len = len(key)
pbuf, pend, buf = _create_buffer(key_len + 2)
librtmp.AMF_EncodeInt16(pbuf, pend, key_len)
buf[2:key_len + 2] = key
return buf[:]
@singledispatch
def encoder(val):
raise AMFError("Unable to encode '{0}' type".format(type(val).__name__))
@encoder.register(type(None))
def _encode_none(val):
return bytes((librtmp.AMF_NULL,))
@encoder.register(str)
def _encode_str(val):
val = AVal(val)
pbuf, pend, buf = _create_buffer(val.aval.av_len + 1 + 4)
res = librtmp.AMF_EncodeString(pbuf, pend, val.aval)
size = res - pbuf
return buf[:size]
if is_py2:
encoder.register(unicode, _encode_str)
@encoder.register(float)
@encoder.register(int)
def _encode_number(val):
val = float(val)
pbuf, pend, buf = _create_buffer(9)
librtmp.AMF_EncodeNumber(pbuf, pend, val)
return buf[:]
if is_py2:
encoder.register(long, _encode_number)
@encoder.register(bool)
def _encode_boolean(val):
pbuf, pend, buf = _create_buffer(2)
librtmp.AMF_EncodeBoolean(pbuf, pend, int(val))
return buf[:]
@encoder.register(AMFObject)
def _encode_object(val):
phead, headend, head = _create_buffer(4)
head[0] = bytes((librtmp.AMF_OBJECT,))
librtmp.AMF_EncodeInt24(phead + 1, headend, librtmp.AMF_OBJECT_END)
body = bytearray()
for key, value in val.items():
body += _encode_key_name(key)
body += encoder(value)
return head[:1] + bytes(body) + head[1:]
@encoder.register(dict)
def _encode_ecma_array(val):
phead, headend, head = _create_buffer(8)
head[0] = bytes((librtmp.AMF_ECMA_ARRAY,))
librtmp.AMF_EncodeInt32(phead + 1, headend, len(val))
librtmp.AMF_EncodeInt24(phead + 5, headend, librtmp.AMF_OBJECT_END)
body = bytearray()
for key, value in val.items():
body += _encode_key_name(key)
body += encoder(value)
return head[:5] + bytes(body) + head[5:]
@encoder.register(list)
def _encode_array(val):
phead, headend, head = _create_buffer(5)
head[0] = bytes((librtmp.AMF_STRICT_ARRAY,))
librtmp.AMF_EncodeInt32(phead + 1, headend, len(val))
body = bytearray()
for value in val:
body += encoder(value)
return head[:] + bytes(body)
def _decode_prop(prop):
prop_type = librtmp.AMFProp_GetType(prop)
if prop_type == librtmp.AMF_NUMBER:
val = librtmp.AMFProp_GetNumber(prop)
elif prop_type in AMF_STRING_TYPES:
aval = AVal()
librtmp.AMFProp_GetString(prop, aval.aval)
val = aval.value.decode("utf8", "ignore")
elif prop_type == librtmp.AMF_BOOLEAN:
val = bool(librtmp.AMFProp_GetBoolean(prop))
elif prop_type in AMF_OBJECT_DICT_TYPES:
if prop_type == librtmp.AMF_OBJECT:
val = AMFObject()
else:
val = dict()
for key, value in _decode_prop_obj(prop):
val[key] = value
elif prop_type == librtmp.AMF_STRICT_ARRAY:
val = []
for key, value in _decode_prop_obj(prop):
val.append(value)
else:
val = None
return val
def _decode_prop_obj(prop):
obj = ffi.new("AMFObject*")
librtmp.AMFProp_GetObject(prop, obj)
prop_count = librtmp.AMF_CountProp(obj)
for i in range(prop_count):
prop = librtmp.AMF_GetProp(obj, ffi.NULL, i)
key = AVal()
librtmp.AMFProp_GetName(prop, key.aval)
key = key.value.decode("utf8", "ignore")
value = _decode_prop(prop)
yield key, value
def encode_amf(value):
return encoder(value)
def decode_amf(body):
obj = ffi.new("AMFObject*")
res = librtmp.AMF_Decode(obj, body, len(body), 0)
if res == ffi.NULL:
raise AMFError("Unable to decode AMF data")
rval = []
prop_count = librtmp.AMF_CountProp(obj)
for i in range(prop_count):
prop = librtmp.AMF_GetProp(obj, ffi.NULL, i)
val = _decode_prop(prop)
rval.append(val)
return rval
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