def test_mdhd_build(self):
mdhd_data = Box.build(
dict(type=b"mdhd",
creation_time=0,
modification_time=0,
timescale=1000000,
duration=0,
language=u"und"))
self.assertEqual(len(mdhd_data), 32)
self.assertEqual(
mdhd_data,
b'\x00\x00\x00\x20mdhd\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0fB@\x00\x00\x00\x00U\xc4\x00\x00'
)
mdhd_data64 = Box.build(
dict(type=b"mdhd",
version=1,
creation_time=0,
modification_time=0,
timescale=1000000,
duration=0,
language=u"und"))
self.assertEqual(len(mdhd_data64), 44)
self.assertEqual(
mdhd_data64,
b'\x00\x00\x00,mdhd\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0fB@\x00\x00\x00\x00\x00\x00\x00\x00U\xc4\x00\x00'
)
def test_ftyp_build(self):
self.assertEqual(
Box.build(
dict(type=b"ftyp",
major_brand=b"iso5",
minor_version=1,
compatible_brands=[b"iso5", b"avc1"])),
b'\x00\x00\x00\x18ftypiso5\x00\x00\x00\x01iso5avc1')
def test_tenc_build(self):
self.assertEqual(
Box.build(dict(
type=b"tenc",
key_ID=UUID('337b9643-21b6-4355-9e59-3eccb46c7ef7'),
iv_size=8,
is_encrypted=1)),
b'\x00\x00\x00 tenc\x00\x00\x00\x00\x00\x00\x01\x083{\x96C!\xb6CU\x9eY>\xcc\xb4l~\xf7')
def decrypt(key, inp, out):
"""
decrypt()
@param key: AES-128 CENC key in bytes
@param inp: Open input file
@param out: Open output file
"""
with BufferedReader(inp) as reader:
senc_boxes = deque()
trun_boxes = deque()
while reader.peek(1):
box = Box.parse_stream(reader)
fix_headers(box)
for stsd_box in BoxUtil.find(box, b'stsz'):
sample_size = stsd_box.sample_size
if box.type == b'moof':
senc_boxes.extend(BoxUtil.find(box, b'senc'))
trun_boxes.extend(BoxUtil.find(box, b'trun'))
elif box.type == b'mdat':
senc_box = senc_boxes.popleft()
trun_box = trun_boxes.popleft()
clear_box = b''
with BytesIO(box.data) as box_bytes:
for sample, sample_info in zip(
senc_box.sample_encryption_info,
trun_box.sample_info):
counter = Counter.new(64,
prefix=sample.iv,
initial_value=0)
cipher = AES.new(key, AES.MODE_CTR, counter=counter)
if sample_size:
cipher_bytes = box_bytes.read(sample_size)
clear_box += cipher.decrypt(cipher_bytes)
elif not sample.subsample_encryption_info:
cipher_bytes = box_bytes.read(
sample_info.sample_size)
clear_box += cipher.decrypt(cipher_bytes)
else:
for subsample in sample.subsample_encryption_info:
clear_box += box_bytes.read(
subsample.clear_bytes)
cipher_bytes = box_bytes.read(
subsample.cipher_bytes)
clear_box += cipher.decrypt(cipher_bytes)
box.data = clear_box
out.write(Box.build(box))
return
def test_moov_build(self):
moov = \
Container(type=b"moov")(children=[ # 96 bytes
Container(type=b"mvex")(children=[ # 88 bytes
Container(type=b"mehd")(version=0)(flags=0)(fragment_duration=0), # 16 bytes
Container(type=b"trex")(track_ID=1), # 32 bytes
Container(type=b"trex")(track_ID=2), # 32 bytes
])
])
moov_data = Box.build(moov)
self.assertEqual(len(moov_data), 96)
self.assertEqual(
moov_data, b'\x00\x00\x00\x60moov'
b'\x00\x00\x00\x58mvex'
b'\x00\x00\x00\x10mehd\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x20trex\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x20trex\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
)
def test_build_emib(self):
emib_b = Box.build(
dict(type=b"emib",
version=0,
reserved=1,
presentation_time_delta=-1000,
value=b'',
id=1,
scheme_id_uri=b"my_test_scheme",
duration=2000,
message_data=b"asdfdasgfaghhgsdgh"))
emib_b_p = Box.parse(emib_b)
self.assertEqual(emib_b_p["type"], b'emib')
self.assertEqual(emib_b_p["presentation_time_delta"], -1000)
self.assertEqual(emib_b_p["value"], b'')
self.assertEqual(emib_b_p["id"], 1)
self.assertEqual(emib_b_p["scheme_id_uri"], b"my_test_scheme")
self.assertEqual(emib_b_p["duration"], 2000)
self.assertEqual(emib_b_p["reserved"], 1)
self.assertEqual(emib_b_p["message_data"], b"asdfdasgfaghhgsdgh")
def test_build_emsg(self):
emsg_b = Box.build(
dict(type=b"emsg",
version=1,
presentation_time=1000,
value=b'',
id=1,
scheme_id_uri=b"my_test_scheme",
event_duration=20,
timescale=1,
message_data=b"asdfdasgfaghhgsdgh"))
emsg_b_p = Box.parse(emsg_b)
self.assertEqual(emsg_b_p["type"], b'emsg')
self.assertEqual(emsg_b_p["version"], 1)
self.assertEqual(emsg_b_p["presentation_time"], 1000)
self.assertEqual(emsg_b_p["value"], b'')
self.assertEqual(emsg_b_p["id"], 1)
self.assertEqual(emsg_b_p["scheme_id_uri"], b"my_test_scheme")
self.assertEqual(emsg_b_p["event_duration"], 20)
self.assertEqual(emsg_b_p["timescale"], 1)
self.assertEqual(emsg_b_p["message_data"], b"asdfdasgfaghhgsdgh")
def test_parse_edit_list(self):
elst_b = Box.parse(
b'\x00\x00\x00\x1celst\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x0f\xa0\x00\x00\x04\x00\x00\x01\x00\x00'
)
[Container(edit_duration=4000)(media_time=1024)]
self.assertEqual(elst_b["type"], b"elst")
self.assertEqual(len(elst_b["entries"]), 1)
self.assertEqual(elst_b["entries"][0]["edit_duration"], 4000)
self.assertEqual(elst_b["entries"][0]["media_time"], 1024)
self.assertEqual(elst_b["entries"][0]["media_rate_integer"], 1)
self.assertEqual(elst_b["entries"][0]["media_rate_fraction"], 0)
t = dict(
type=b"elst",
version=1,
flags=0,
entries=[dict(edit_duration=1,media_time=1, media_rate_integer=1, media_rate_fraction=1)\
,dict(edit_duration=2,media_time=2, media_rate_integer=1,
media_rate_fraction=1) ],
)
elst_b = Box.build(t)
t2 = Box.parse(elst_b)
self.assertEqual(len(t["entries"]), len(t2["entries"]))
def test_build_evte(self):
evte = Box.build(dict(type=b"evte", children=[]))
def test_smhd_build(self):
smhd_data = Box.build(dict(type=b"smhd", balance=0))
self.assertEqual(len(smhd_data), 16),
self.assertEqual(
smhd_data, b'\x00\x00\x00\x10smhd\x00\x00\x00\x00\x00\x00\x00\x00')
def _output_mp4_footer(self, framerate, resolution):
# Extact all the variables used after in the construction of the boxes
sample_count = len(self._sample_sizes)
timescale = framerate.numerator
sample_delta = framerate.denominator
duration = sample_count * sample_delta
chunk_offset = self.mdat_payload_offset
width = resolution[0]
height = resolution[1]
profile, compatibility, level = DEFAULT_SPS_INDICATIONS if self.indications is None else self.indications
sample_sizes = self._sample_sizes
sps = list(self.seq_parm_sets)
pps = list(self.pic_parm_sets)
# Build all the boxes we need
HDLR = Container(type=b'hdlr')
HDLR(version=0)
HDLR(flags=0)
HDLR(handler_type=b'vide')
HDLR(name='VideoHandler')
MDHD = Container(type=b'mdhd')
MDHD(version=0)
MDHD(flags=0)
MDHD(creation_time=0)
MDHD(modification_time=0)
MDHD(timescale=timescale)
MDHD(duration=duration)
MDHD(language='und')
URL_ = Container(type=b'url ')
URL_(version=0)
URL_(flags=Container(self_contained=True))
URL_(location=None)
DREF = Container(type=b'dref')
DREF(version=0)
DREF(flags=0)
DREF(data_entries=[URL_])
DINF = Container(type=b'dinf')
DINF(children=[DREF])
STTS = Container(type=b'stts')
STTS(version=0)
STTS(flags=0)
STTS(entries=[
Container(sample_count=sample_count)(sample_delta=sample_delta)
])
AVCC = Container(type=b'avcC')
AVCC(version=1)
AVCC(profile=profile)
AVCC(compatibility=compatibility)
AVCC(level=level)
AVCC(nal_unit_length_field=3)
AVCC(sps=sps)
AVCC(pps=pps)
AVC1 = Container(format=b'avc1')
AVC1(data_reference_index=1)
AVC1(version=0)
AVC1(revision=0)
AVC1(vendor=b'')
AVC1(temporal_quality=0)
AVC1(spatial_quality=0)
AVC1(width=width)
AVC1(height=height)
AVC1(horizontal_resolution=72)
AVC1(vertical_resolution=72)
AVC1(data_size=0)
AVC1(frame_count=1)
AVC1(compressor_name=b'')
AVC1(depth=24)
AVC1(color_table_id=-1)
AVC1(avc_data=AVCC)
STSD = Container(type=b'stsd')
STSD(version=0)
STSD(flags=0)
STSD(entries=[AVC1])
STSC = Container(type=b'stsc')
STSC(version=0)
STSC(flags=0)
STSC(entries=[
Container(first_chunk=1)(samples_per_chunk=sample_count)(
sample_description_index=1)
])
STCO = Container(type=b'stco')
STCO(version=0)
STCO(flags=0)
STCO(entries=[Container(chunk_offset=chunk_offset)])
STSZ = Container(type=b'stsz')
STSZ(version=0)
STSZ(flags=0)
STSZ(sample_size=0)
STSZ(sample_count=sample_count)
STSZ(entry_sizes=sample_sizes)
STBL = Container(type=b'stbl')
STBL(children=[STSD, STTS, STSC, STSZ, STCO])
VMHD = Container(type=b'vmhd')
VMHD(version=0)
VMHD(flags=1)
VMHD(graphics_mode=0)
VMHD(opcolor=Container(red=0)(green=0)(blue=0))
MINF = Container(type=b'minf')
MINF(children=[VMHD, DINF, STBL])
MDIA = Container(type=b'mdia')
MDIA(children=[MDHD, HDLR, MINF])
# Width and height in TKHD are 16.16 integers
TKHD = Container(type=b'tkhd')
TKHD(version=0)
TKHD(flags=3)
TKHD(creation_time=0)
TKHD(modification_time=0)
TKHD(track_ID=1)
TKHD(duration=duration)
TKHD(layer=0)
TKHD(alternate_group=0)
TKHD(volume=0)
TKHD(matrix=UNITY_MATRIX)
TKHD(width=width << 16)
TKHD(height=height << 16)
TRAK = Container(type=b'trak')
TRAK(children=[TKHD, MDIA])
MVHD = Container(type=b'mvhd')
MVHD(version=0)
MVHD(flags=0)
MVHD(creation_time=0)
MVHD(modification_time=0)
MVHD(timescale=timescale)
MVHD(duration=duration)
MVHD(rate=0x10000)
MVHD(volume=0x100)
MVHD(matrix=UNITY_MATRIX)
MVHD(pre_defined=[0, 0, 0, 0, 0, 0])
MVHD(next_track_ID=2)
MOOV = Container(type=b'moov')
MOOV(children=[MVHD, TRAK])
# Finally write
self._write(Box.build(MOOV))
# 2 bits for nal ref idc
# 5 bits for nal type
return nal_data[0] & ((1 << 5) - 1)
def sps_get_indications(nal_data):
assert (nal_get_unit_type(nal_data) == NAL_TYPE_SPS)
# After the nal type, follows the profile_idc, the "constraint set", aka
# the compatibility byte, followed by level_idc
return SPSIndications(profile=nal_data[1],
compatibility=nal_data[2],
level=nal_data[3])
STATIC_FTYP = Box.build(
Container(type=b'ftyp')(major_brand=b'isom')(minor_version=0x200)(
compatible_brands=[b'isom', b'iso2', b'avc1', b'mp41']))
STATIC_EMPTY_MDAT = Box.build(Container(type=b'mdat')(data=b''))
class MP4Muxer(object):
def __init__(self):
super(MP4Muxer, self).__init__()
self.indications = None
self.pic_parm_sets = set()
self.seq_parm_sets = set()
self.current_mdat_size = 0
self._sample_sizes = []
self._nal_size_patches = []