def read(cls, a):
a.seek_to_data()
bufferSize = atoms.read_ulong(a.f)
maxBitrate = atoms.read_ulong(a.f)
avgBitrate = atoms.read_ulong(a.f)
return cls(a, bufferSize=bufferSize, maxBitrate=maxBitrate,
avgBitrate=avgBitrate)
def read(cls, a):
# from mp4split
esdesc = atoms.read_uchar(a.f)
if esdesc == MP4_ELEMENTARY_STREAM_DESCRIPTOR_TAG:
len = read_desc_len(a.f)
stream_id = atoms.read_ushort(a.f)
prio = atoms.read_uchar(a.f)
else:
stream_id = atoms.read_ushort(a.f)
tag = atoms.read_uchar(a.f)
len = read_desc_len(a.f)
if tag != MP4_DECODER_CONFIG_DESCRIPTOR_TAG:
raise FormatError("can't parse esds")
object_type_id = atoms.read_uchar(a.f)
stream_type = atoms.read_uchar(a.f)
buffer_size_db = a.read_bytes(3)
maxBitrate = atoms.read_ulong(a.f)
avgBitrate = atoms.read_ulong(a.f)
tag = atoms.read_uchar(a.f)
len = read_desc_len(a.f)
if tag != MP4_DECODER_SPECIFIC_DESCRIPTOR_TAG:
raise FormatError("can't parse esd")
data = a.read_bytes(len)
return cls(a, object_type_id=object_type_id,
maxBitrate=maxBitrate, avgBitrate=avgBitrate, data=data)
def read(cls, a):
ss = read_ulong(a.f)
entries = read_ulong(a.f)
if ss == 0:
t = read_table(a.f, 'L', entries)
else:
t = []
return cls(a, sample_size=ss, table=t)
def read(cls, a):
count = read_ulong(a.f)
entries = []
while count > 0:
b = atoms.read_atom(a.f)
entries.append(b)
count = count - 1
entries = map(lambda a: maybe_build_atoms(a.type, [a])[0], entries)
return cls(a, count=count, entries=entries)
def read(cls, a):
field_size = read_ulong(a.f) & 0xff
entries = read_ulong(a.f)
def read_2u4(f):
b = read_bytes(f, 1)
return (b >> 4) & 0x0f, b & 0x0f
def flatten(l):
ret = []
for elt in l:
ret.extend(elt)
return ret
if field_size == 16:
t = read_table(a.f, 'H', entries)
elif field_size == 8:
t = read_table(a.f, 'B', entries)
elif field_size == 4:
t = flatten([read_2u4(a.f) for _ in xrange((entries + 1) / 2)])
else:
raise FormatError()
return cls(a, field_size=field_size, table=t)
def read(cls, a):
a.seek_to_data()
a.skip(6)
idx = atoms.read_ushort(a.f)
a.skip(4 * 4)
width = atoms.read_ushort(a.f)
height = atoms.read_ushort(a.f)
hr = a.read_bytes(4)
vr = a.read_bytes(4)
reserved = atoms.read_ulong(a.f)
fc = atoms.read_ushort(a.f)
comp = a.read_bytes(32)
depth = atoms.read_ushort(a.f)
minusone = atoms.read_short(a.f)
if (minusone != -1):
raise FormatError()
# optional boxes follow
extra = list(atoms.read_atoms(a.f, a.size - 86))
a.seek_to_data()
a.skip(86)
extra = map(lambda a: maybe_build_atoms(a.type, [a])[0], extra)
return cls(a, index=idx, width=width, height=height, comp=comp, extra=extra)
def read(cls, a):
track_id = read_ulong(a.f)
return cls(a, track_id=track_id)
def read(cls, a):
a.seek_to_data()
brand = read_fcc(a.f)
v = read_ulong(a.f)
return cls(a, brand=brand, version=v)
def read(cls, a):
entries = read_ulong(a.f)
t = read_table(a.f, 'Q', entries)
return cls(a, table=t)
def read(cls, a):
ver_skip(a, (8, 16))
ts = read_ulong(a.f)
d = ver_read(a, (read_ulong, read_ulonglong))
return cls(a, timescale=ts, duration=d)
def read(cls, a):
ver_skip(a, (8, 16))
id = read_ulong(a.f)
a.skip(4)
d = ver_read(a, (read_ulong, read_ulonglong))
return cls(a, duration=d, id=id)