def process_tfhd(self, data):
"Process the mvhd box and set timescale."
tf_flags = str_to_uint32(data[8:12]) & 0xffffff
#print "tfhd flags = %06x" % tf_flags
if self.new_default_sample_duration is not None:
output = uint32_to_str(str_to_uint32(data[0:4]) + 4)
output += data[4:8]
output += uint32_to_str(tf_flags | 0x8)
else:
output = data[0:8]
output += uint32_to_str(tf_flags)
if self.new_track_id is not None:
old_track_id = str_to_uint32(data[12:16])
output += uint32_to_str(self.new_track_id)
print "Changed trackId from %d to %d" % (old_track_id, self.new_track_id)
else:
output += data[12:16]
if self.new_default_sample_duration is not None:
output += uint32_to_str(self.new_default_sample_duration)
print "Added new default sample duration: %d"%(self.new_default_sample_duration)
output += data[16:]
return output
def _generate_trun(self, seg_info, offset):
"Generate trun box with correct sample data for segment."
def nr_sample_bytes(sample_flags):
nr_bytes = 0
for pattern in (0x100, 0x200, 0x400, 0x800):
if sample_flags & pattern != 0:
nr_bytes += 4
return nr_bytes
version = 0
ip = self.input_parser
sample_data_size = nr_sample_bytes(self.sample_flags)
sample_count = seg_info.end_nr - seg_info.start_nr
trun_size = 20 + sample_count * sample_data_size
output = uint32_to_str(trun_size) + 'trun'
flags = self.sample_flags | 0x01 # offset present
version_and_flags = (version << 24) | flags
output += uint32_to_str(version_and_flags)
output += uint32_to_str(sample_count)
output += uint32_to_str(offset + trun_size + 8) # 8 bytes into mdat
for sample in ip.samples[seg_info.start_nr:seg_info.end_nr]:
if self.sample_flags & 0x100:
output += uint32_to_str(sample.dur)
if self.sample_flags & 0x200:
output += uint32_to_str(sample.size)
if self.sample_flags & 0x400:
output += uint32_to_str(sample.flags)
if self.sample_flags & 0x800:
output += uint32_to_str(sample.cto)
return output
def _generate_tfdt(self, seg_info):
if seg_info.start_time > 2**30:
version = 1
size = 20
else:
version = 0
size = 16
output = uint32_to_str(size) + 'tfdt'
if version == 0:
output += uint32_to_str(0x00000000) + uint32_to_str(
seg_info.start_time)
else:
output += uint32_to_str(0x01000000) + uint64_to_str(
seg_info.start_time)
return output
def _generate_traf(self, seg_info, offset):
tfhd = self._generate_tfhd(seg_info, self.track_id)
tfdt = self._generate_tfdt(seg_info)
offset += 8 + len(tfhd) + len(tfdt)
trun = self._generate_trun(seg_info, offset)
size = 8 + len(tfhd) + len(tfdt) + len(trun)
return uint32_to_str(size) + 'traf' + tfhd + tfdt + trun
def process_tkhd(self, data):
"Process tkhd and set flags, trackId and duration."
version = ord(data[8])
output = data[0:9]
output += '\x00' + '\x00' + '\x07' # Set flags to 0x000007
pos = 12
if version == 1:
drange = 16
else:
drange = 8
output += data[pos:pos+drange]
pos += drange
if self.new_track_id is not None:
old_track_id = str_to_uint32(data[pos:pos+4])
output += uint32_to_str(self.new_track_id)
print "Changed trackId from %d to %d" % (old_track_id, self.new_track_id)
else:
output += data[pos:pos+4]
pos += 4
output += data[pos:pos+4]
pos += 4
if version == 1:
output += '\x00'*8 # duration
pos += 8
else: # version = 0
output += '\x00'*4 # duration
pos += 4
output += data[pos:]
return output
def process_trun(self, data, output):
"""Adjust time of tfdt if offset set."""
version_and_flags = str_to_uint32(data[8:12])
# version = version_and_flags >> 24
flags = version_and_flags & 0xffffff
sample_count = str_to_uint32(data[12:16])
offset = 16
if flags & 0x1: # data_offset_present
offset += 4
if flags & 0x4: # first_sample_flags
offset += 4
output += data[:offset]
for i in range(sample_count):
if flags & 0x100: # sample_duration present
output += data[offset:offset + 4]
offset += 4
if flags & 0x200: # sample_size present
output += data[offset:offset + 4]
offset += 4
if flags & 0x400: # sample_flags present
sample_flags = str_to_uint32(data[offset:offset + 4])
if sample_flags != 0x2000000: # Depends on other samples
sample_flags |= 0x10000
output += uint32_to_str(sample_flags)
offset += 4
if flags & 0x800: # composition_time_offset present
output += data[offset:offset + 4]
offset += 4
return output
def process_mfhd(self, data, output):
"Set the sequence number in mfhd."
if self.seq_nr is not None:
output += data[:12] + uint32_to_str(self.seq_nr)
else:
output += data
return output
def _generate_moof(self, sequence_nr, seg_info):
"Generate a moof box with the correct sample entries"
mfhd = self._generate_mfhd(sequence_nr)
offset = 8 + len(mfhd)
traf = self._generate_traf(seg_info, offset)
size = 8 + len(mfhd) + len(traf)
return uint32_to_str(size) + 'moof' + mfhd + traf
def process_tkhd(self, data):
"Process tkhd and set flags, trackId and duration."
version = ord(data[8])
output = data[0:9]
output += '\x00' + '\x00' + '\x07' # Set flags to 0x000007
pos = 12
if version == 1:
drange = 16
else:
drange = 8
output += data[pos:pos + drange]
pos += drange
if self.new_track_id is not None:
old_track_id = str_to_uint32(data[pos:pos + 4])
output += uint32_to_str(self.new_track_id)
print "Changed trackId from %d to %d" % (old_track_id,
self.new_track_id)
else:
output += data[pos:pos + 4]
pos += 4
output += data[pos:pos + 4]
pos += 4
if version == 1:
output += '\x00' * 8 # duration
pos += 8
else: # version = 0
output += '\x00' * 4 # duration
pos += 4
output += data[pos:]
return output
def construct_new_mdat(self, media_info):
"Return an mdat box with data for samples in media_info."
start_nr = media_info.start_nr
end_nr = media_info.end_nr
sample_data = []
for i in range(media_info.start_nr, media_info.end_nr):
sample = self.samples[i]
sample_data.append(self.data[sample.offset:sample.offset +
sample.size])
combined_data = "".join(sample_data)
return uint32_to_str(8 + len(combined_data)) + 'mdat' + combined_data
def process_trun(self, data):
tf_flags = str_to_uint32(data[8:12]) & 0xffffff
output = data[0:8]
output += uint32_to_str(tf_flags)
print "Changing trun sample count"
output += uint32_to_str(1)
if tf_flags & 1:
data_offset = str_to_uint32(data[16:20])
if self.new_default_sample_duration is not None:
print "Changing trun data offset: %d to %d"%(data_offset, data_offset + 4)
data_offset += 4
output += uint32_to_str(data_offset)
output += data[20:]
return output
def finalize(self):
"Rewrite the size fields which have changed"
op = self.output
op_parts = []
size_reduction = self.trun_data['size'] - self.trun_data['new_size']
op_parts.append(op[:self.moof_data['pos']])
# Write new moof size
new_moof_size = self.moof_data['size'] - size_reduction
op_parts.append(uint32_to_str(new_moof_size))
pos = self.moof_data['pos'] + 4
op_parts.append(op[pos:self.traf_data['pos']])
# Write new traf size
new_traf_size = self.traf_data['size'] - size_reduction
op_parts.append(uint32_to_str(new_traf_size))
pos = self.traf_data['pos'] + 4
op_parts.append(op[pos:])
self.output = "".join(op_parts)
def process_tfhd(self, data):
"Process the mvhd box and set timescale."
tf_flags = str_to_uint32(data[8:12]) & 0xffffff
print "tfhd flags = %06x" % tf_flags
output = data[0:12]
if self.new_track_id is not None:
old_track_id = str_to_uint32(data[12:16])
output += uint32_to_str(self.new_track_id)
print "Changed trackId from %d to %d" % (old_track_id, self.new_track_id)
else:
output += data[12:16]
output += data[16:]
return output
def process_composite_box(self, path, data):
"Process a composite box."
#pylint: disable=unused-variable
container_size, container_box_type = self.check_box(data[0:8])
inner_data = ""
pos = 8
while pos < len(data):
size, box_type = self.check_box(data[pos:pos + 8])
inner_data += self.filterbox(box_type, data[pos:pos+size], None, path)
pos += size
new_container_size = 8 + len(inner_data)
#Note. If this has changed, make sure that offsets are changes appropriately
return uint32_to_str(new_container_size) + container_box_type + inner_data
def change_brands(indata, major_brand, compatibility_brands, minor_version=0):
"Change brands in input string indata and return new string."
size = str_to_uint32(indata)
ftyp = indata[4:8]
assert ftyp == "ftyp"
in_major_brand = indata[8:12]
print "Changing major brand %s - > %s" % (in_major_brand, major_brand)
in_minor_version = str_to_uint32(indata[12:16])
print "minorVersion: %s -> %s" % (in_minor_version, minor_version)
pos = 16
in_compatibility_brands = []
while pos < size:
in_compatibility_brands.append(indata[pos:pos+4])
pos += 4
print "Compatibility brands: %s -> %s" % (in_compatibility_brands, compatibility_brands)
out_size = 16 + 4*len(compatibility_brands)
outdata = uint32_to_str(out_size) + "ftyp" + major_brand + uint32_to_str(minor_version)
for brand in compatibility_brands:
outdata += brand
outdata += indata[size:]
return outdata
def process_composite_box(self, path, data):
"Process composite boxes."
container_size, container_box_type = self.check_box(data[0:8])
inner_data = ""
pos = 8
while pos < len(data):
size, box_type = self.check_box(data[pos:pos + 8])
inner_data += self.filterbox(box_type, data[pos:pos+size], None, path)
#print "Box:",box_type,", size:",size,", newsize:",len(inner_data)
pos += size
new_container_size = 8 + len(inner_data)
#TODO. If this has changed, make sure that offsets are changes appropriately
return uint32_to_str(new_container_size) + container_box_type + inner_data
def process_composite_box(self, path, data):
"Process a composite box."
#pylint: disable=unused-variable
container_size, container_box_type = self.check_box(data[0:8])
inner_data = ""
pos = 8
while pos < len(data):
size, box_type = self.check_box(data[pos:pos + 8])
inner_data += self.filterbox(box_type, data[pos:pos+size], None, path)
pos += size
new_container_size = 8 + len(inner_data)
#Note. If this has changed, make sure that offsets are changes appropriately
return uint32_to_str(new_container_size) + container_box_type + inner_data
def change_brands(indata, major_brand, compatibility_brands, minor_version=0):
"Change brands in input string indata and return new string."
size = str_to_uint32(indata)
ftyp = indata[4:8]
assert ftyp == "ftyp"
in_major_brand = indata[8:12]
print "Changing major brand %s - > %s" % (in_major_brand, major_brand)
in_minor_version = str_to_uint32(indata[12:16])
print "minorVersion: %s -> %s" % (in_minor_version, minor_version)
pos = 16
in_compatibility_brands = []
while pos < size:
in_compatibility_brands.append(indata[pos : pos + 4])
pos += 4
print "Compatibility brands: %s -> %s" % (in_compatibility_brands, compatibility_brands)
out_size = 16 + 4 * len(compatibility_brands)
outdata = uint32_to_str(out_size) + "ftyp" + major_brand + uint32_to_str(minor_version)
for brand in compatibility_brands:
outdata += brand
outdata += indata[size:]
return outdata
def process_tfhd(self, data):
"Process the mvhd box and set timescale."
tf_flags = str_to_uint32(data[8:12]) & 0xffffff
print "tfhd flags = %06x" % tf_flags
output = data[0:12]
if self.new_track_id is not None:
old_track_id = str_to_uint32(data[12:16])
output += uint32_to_str(self.new_track_id)
print "Changed trackId from %d to %d" % (old_track_id, self.new_track_id)
else:
output += data[12:16]
output += data[16:]
return output
def _generate_sidx(self, segment_info, segment_sizes, timescale):
"Generate sidx box."
earliest_presentation_time = segment_info[0].start_time
parts = ['sidx',
uint32_to_str(0), # version + flags
uint32_to_str(1), # reference_ID
uint32_to_str(timescale),
uint32_to_str(earliest_presentation_time),
uint32_to_str(0), # first_offset
uint16_to_str(0), # reserved
uint16_to_str(len(segment_sizes))] # reference_count
for info, size in zip(segment_info, segment_sizes):
parts.append(uint32_to_str(size)) # Setting reference type to 0
parts.append(uint32_to_str(info.dur))
parts.append(uint32_to_str(0x90000000)) # SAP info
output = ''.join(parts)
size = 4 + len(output)
output = uint32_to_str(size) + output
return output
def process_file(self):
"Process the file and add or remove lmsg."
ifh = open(self.file_path, "rb")
data = ifh.read()
styplen = str_to_uint32(data[:4])
box_type = data[4:8]
assert box_type == "styp"
pos = 16
lmsg_found = False
while pos < styplen:
compatible_brand = data[pos:pos+4]
if compatible_brand == "lmsg":
lmsg_found = True
if self.remove_lmsg_flag:
print "Found lmsg to remove"
break
pos += 4
ofh = cStringIO.StringIO()
if self.add_lmsg_flag and not lmsg_found:
ofh.write(uint32_to_str(styplen+4))
ofh.write(data[4:styplen])
ofh.write("lmsg")
ofh.write(data[styplen:])
print "Adding lmsg"
elif self.remove_lmsg_flag and lmsg_found:
ofh.write(uint32_to_str(styplen-4))
ofh.write(data[4:pos])
ofh.write(data[pos+4:])
else:
print "No change done to %s" % self.file_path
return # Nothing to do
ifh.close()
replace = open(self.file_path, "wb")
replace.write(ofh.getvalue())
replace.close()
print "Wrote %s" % self.file_path
def process_file(self):
"Process the file and add or remove lmsg."
ifh = open(self.file_path, "rb")
data = ifh.read()
styplen = str_to_uint32(data[:4])
box_type = data[4:8]
assert box_type == "styp"
pos = 16
lmsg_found = False
while pos < styplen:
compatible_brand = data[pos:pos + 4]
if compatible_brand == "lmsg":
lmsg_found = True
if self.remove_lmsg_flag:
print "Found lmsg to remove"
break
pos += 4
ofh = cStringIO.StringIO()
if self.add_lmsg_flag and not lmsg_found:
ofh.write(uint32_to_str(styplen + 4))
ofh.write(data[4:styplen])
ofh.write("lmsg")
ofh.write(data[styplen:])
print "Adding lmsg"
elif self.remove_lmsg_flag and lmsg_found:
ofh.write(uint32_to_str(styplen - 4))
ofh.write(data[4:pos])
ofh.write(data[pos + 4:])
else:
print "No change done to %s" % self.file_path
return # Nothing to do
ifh.close()
replace = open(self.file_path, "wb")
replace.write(ofh.getvalue())
replace.close()
print "Wrote %s" % self.file_path
def finalize(self):
print "Changing default sample size"
if self.new_default_sample_duration:
newoutput = self.output[:76]
else:
newoutput = self.output[:72]
newoutput += uint32_to_str(self.ttml_length)
if self.new_default_sample_duration:
newoutput += self.output[80:]
else:
newoutput += self.output[76:]
self.output = newoutput
def process_mdat(self, data):
print "Merging all ttml samples into one"
ttml = data[8:]
#print "------------------------------"
#print ttml
# Process TTML
# TODO Fix this to use something better then string replace
ttml = ttml.replace(REPLACE_STRING, "")
self.ttml_length = len(ttml)
#print "------------------------------"
#print ttml
output = uint32_to_str(self.ttml_length + 8)
output += data[4:8]
output += ttml
return output
def process_tfdt(self, data, output):
"""Adjust time of tfdt if offset set."""
version = ord(data[8])
if version == 0: # 32-bit baseMediaDecodeTime
tfdt = str_to_uint32(data[12:16])
if self.offset != None:
tfdt += self.offset
output += data[:12] + uint32_to_str(tfdt) + data[16:]
else:
output += data
else:
output = data[:12]
tfdt = str_to_uint64(data[12:20])
if self.offset != None:
tfdt += self.offset
output += uint64_to_str(tfdt)
else:
output += data
self.tfdt = tfdt
return output
def process_tfdt(self, data, output):
"""Adjust time of tfdt if offset set."""
version = ord(data[8])
if version == 0: # 32-bit baseMediaDecodeTime
tfdt = str_to_uint32(data[12:16])
if self.offset != None:
tfdt += self.offset
output += data[:12] + uint32_to_str(tfdt) + data[16:]
else:
output += data
else:
output = data[:12]
tfdt = str_to_uint64(data[12:20])
if self.offset != None:
tfdt += self.offset
output += uint64_to_str(tfdt)
else:
output += data
self.tfdt = tfdt
return output
def _generate_tfhd(self, seg_info, track_id):
ip = self.input_parser
first_sample = ip.samples[seg_info.start_nr]
common_size = first_sample.size
common_dur = first_sample.dur
common_flags = first_sample.flags
common_cto = first_sample.cto
for sample in ip.samples[seg_info.start_nr + 1:seg_info.end_nr]:
if sample.dur != common_dur:
common_dur = None
if sample.size != common_size:
common_size = None
if sample.flags != common_flags:
common_flags = None
if sample.cto != common_cto:
common_cto = None
flags = 0x020000
data = ""
sample_flags = 0 # Which individual sample data is needed
if common_dur is not None:
flags |= 0x08
data += uint32_to_str(common_dur)
else:
sample_flags |= 0x100
if common_size is not None:
flags |= 0x10
data += uint32_to_str(common_size)
else:
sample_flags |= 0x200
if common_flags is not None:
flags |= 0x20
data += uint32_to_str(common_flags)
else:
sample_flags |= 0x400
if common_cto is None or common_cto != 0:
sample_flags |= 0x800
size = 16 + len(data)
self.sample_flags = sample_flags
version_and_flags = flags
return (uint32_to_str(size) + 'tfhd' +
uint32_to_str(version_and_flags) + uint32_to_str(track_id) +
data)
def _generate_mfhd(self, sequence_nr):
return (uint32_to_str(16) + # size
'mfhd' + uint32_to_str(0) + # version_and_flags
uint32_to_str(sequence_nr))
def process_trun(self, data):
"""Remove all samples but one, and change offset and report size."""
size, b_type = self.check_box(data)
assert b_type == "trun"
self.trun_data = {'size': size}
# version = ord(data[8])
flags = str_to_uint32(data[8:12]) & 0xffffff
has_data_offset = flags & 0x0001
if not has_data_offset:
raise ValueError("Cannot shorten segment without data_offset")
has_first_sample_flags = flags & 0x0004
has_sample_duration = flags & 0x0100
if not has_sample_duration:
raise ValueError("Cannot shorten segment without sample duration")
has_sample_size = flags & 0x0200
if not has_sample_size:
raise ValueError("Cannot shorten segment without sample_size")
has_sample_flags = flags & 0x0400
has_sample_composition_time_offset = flags & 0x0800
sample_count = str_to_uint32(data[12:16])
entry_offset = 16
data_offset = str_to_uint32(data[entry_offset:entry_offset + 4])
entry_offset += 4
if has_first_sample_flags:
entry_offset += 4
sample_row_size = ((has_sample_duration and 4) +
(has_sample_size and 4) + (has_sample_flags and 4) +
(has_sample_composition_time_offset and 4))
# Iterate over all samples and add up duration.
# Set the duration of the I-frame to the total duration
total_duration = 0
pos = entry_offset
for i in range(sample_count):
total_duration += str_to_uint32(data[pos:pos + 4])
pos += 4
if i == 0:
sample_size = str_to_uint32(data[pos:pos + 4])
self.trun_data['first_sample_size'] = sample_size
pos += 4
if has_sample_flags:
pos += 4
if has_sample_composition_time_offset:
pos += 4
new_size = size - (sample_count - 1) * sample_row_size
self.trun_data['new_size'] = new_size
new_data_offset = data_offset - (size - new_size)
# Here starts the trun output
output = uint32_to_str(new_size) + data[4:12]
output += uint32_to_str(1) # 1 sample
output += uint32_to_str(new_data_offset)
pos = entry_offset
if has_first_sample_flags:
output += data[pos:pos + 4]
pos += 4
output += uint32_to_str(total_duration)
pos += 4
output += data[pos:pos + sample_row_size - 4]
return output
def process_mdat(self, data):
"""Remove all samples but one, and change offset and report size."""
size, b_type = self.check_box(data)
assert b_type == "mdat"
data_size = self.trun_data['first_sample_size']
return uint32_to_str(data_size + 8) + "mdat" + data[8:8 + data_size]
