def __init__(self, filename, grey=False, reindex=False):
# Be compatible with pathlib.Path filenames
filename = str(filename).encode('utf-8')
self.filename = filename
self.grey = grey
open(filename).close()
self._myiter = None
self.systime_offset = 0
need_index = True
idx = index_file(self.filename)
if os.path.exists(idx):
try:
index = json.load(open(idx))
except Exception:
pass
else:
if index['version'] == INDEX_VERSION:
self.frame = index['frame']
self.systime_offset = index['systime_offset']
self.mjpg_mode = index['mjpg_mode']
need_index = False
if need_index or reindex:
self.frame = []
m = lib.mkv_open(self.filename)
frm = ffi.new('struct mkv_frame *')
cluster_offsets = set()
while lib.mkv_next(m, frm):
if frm.key_frame:
if frm.offset in cluster_offsets:
print("FIXME: Multiple keyframes per cluster!")
cluster_offsets.add(frm.key_frame)
self.frame.append([frm.pts, frm.offset, frm.key_frame])
self.frame.sort()
self.systime_offset = iter(self).estimate_systime_offset() # FIXME: This makes a second pass over the file parsing it
self.mjpg_mode = (ffi.string(m.codec_id) == b'V_MS/VFW/FOURCC')
lib.mkv_close(m)
tmp = idx + '.tmp.%d' % os.getpid()
with open(tmp, 'w') as fd:
json.dump({'frame': self.frame,
'systime_offset': self.systime_offset,
'mjpg_mode': self.mjpg_mode,
'version': INDEX_VERSION}, fd)
try:
os.link(tmp, idx)
except FileExistsError:
pass
os.unlink(tmp)
def __init__(self, filename, grey=False, reindex=False):
if sys.version_info > (3, ):
filename = bytes(filename, "utf8")
self.filename = filename
self.grey = grey
open(filename).close()
self._myiter = None
self.systime_offset = 0
need_index = True
idx = index_file(self.filename)
if os.path.exists(idx):
index = json.load(open(idx))
if index['version'] == INDEX_VERSION:
self.frame = index['frame']
self.systime_offset = index['systime_offset']
self.mjpg_mode = index['mjpg_mode']
need_index = False
if need_index or reindex:
self.frame = []
m = lib.mkv_open(self.filename)
frm = ffi.new('struct mkv_frame *')
cluster_offsets = set()
while lib.mkv_next(m, frm):
if frm.key_frame:
if frm.offset in cluster_offsets:
print("FIXME: Multiple keyframes per cluster!")
cluster_offsets.add(frm.key_frame)
self.frame.append([frm.pts, frm.offset, frm.key_frame])
self.frame.sort()
self.systime_offset = iter(self).estimate_systime_offset(
) # FIXME: This makes a second pass over the file parsing it
self.mjpg_mode = (ffi.string(m.codec_id) == b'V_MS/VFW/FOURCC')
lib.mkv_close(m)
with open(idx, 'w') as fd:
json.dump(
{
'frame': self.frame,
'systime_offset': self.systime_offset,
'mjpg_mode': self.mjpg_mode,
'version': INDEX_VERSION
}, fd)
def __init__(self, filename, systime_offset, grey=False):
self.m = lib.mkv_open(filename)
self.systime_offset = systime_offset
self.frm = ffi.new('struct mkv_frame *')
self.out_of_packages = False
lib.mkv_next(self.m, self.frm)
assert self.m.codec_private
assert self.m.codec_private_len > 0
if ffi.string(self.m.codec_id) == b'V_MS/VFW/FOURCC':
self.decoder = MjpgDecoder()
else:
self.decoder = H264Decoder()
self.decoder.open(self.m)
self.fcnt = 0
self.pts = ffi.new('uint64_t *')
if grey:
self.channels = 1
else:
self.channels = 3
if not self.m:
raise IOError("Failed to open: " + filename)
def serial_number(self):
"""
The Axis serial number or mac address of the camera that made this recording.
"""
self.myiter.next()
return ffi.string(self.myiter.m.mac)