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):
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):
a.seek_to_data()
a.skip(6) # reserved
idx = atoms.read_ushort(a.f)
version = atoms.read_ushort(a.f)
a.skip(4 + 2) # reserved
channelcount = atoms.read_ushort(a.f)
if channelcount == 3:
channelcount = 6 # from mp4split
samplesize = atoms.read_ushort(a.f)
a.skip(4)
sampleratehi = atoms.read_ushort(a.f)
sampleratelo = atoms.read_ushort(a.f)
# FIXME: parse version != 0 samples_per_packet etc..
# optional boxes follow
extra = list(atoms.read_atoms(a.f, a.size - 36))
a.seek_to_data()
a.skip(36)
extra = map(lambda a: maybe_build_atoms(a.type, [a])[0], extra)
return cls(a, index=idx, channelcount=channelcount, samplesize=samplesize,
sampleratehi=sampleratehi, sampleratelo=sampleratelo,
extra=extra)