Example #1
0
    def next(self):
        assert self.m.width > 0
        if self.channels == 1:
            shape = (self.m.height, self.m.width)
        else:
            shape = (self.m.height, self.m.width, self.channels)

        img = Frame(shape, 'B')
        assert img.__array_interface__['strides'] is None
        pixels = ffi.cast('uint8_t *', img.__array_interface__['data'][0])

        while True:
            r = lib.decode_frame(self.p, self.frm, pixels, self.pts, self.channels == 1)
            if r >= 0:
                if lib.mkv_next(self.m, self.frm) == 0 and r == 0:
                    raise StopIteration
                if r == 1:
                    break
            else:
                raise DecodeError

        img.index = self.fcnt
        img.pts = self.pts[0]
        img.timestamp = float(img.pts) / 1000000.0
        img.systime = float(img.pts + self.systime_offset) / 1000000.0
        self.fcnt += 1
        return img
Example #2
0
    def next(self):
        assert self.m.width > 0
        if self.channels == 1:
            shape = (self.m.height, self.m.width)
        else:
            shape = (self.m.height, self.m.width, self.channels)

        img = Frame(shape, 'B')
        assert img.__array_interface__['strides'] is None
        pixels = ffi.cast('uint8_t *', img.__array_interface__['data'][0])

        while True:
            r = self.decoder.decode_frame(self.frm, pixels, self.pts,
                                          self.channels == 1)
            if r >= 0:
                if lib.mkv_next(self.m, self.frm) == 0 and r == 0:
                    raise StopIteration
                if r == 1:
                    break
            else:
                raise DecodeError

        img.index = self.fcnt
        img.pts = self.pts[0]
        img.timestamp = float(img.pts) / 1000000.0
        img.systime = float(img.pts + self.systime_offset) / 1000000.0
        self.fcnt += 1
        return img
Example #3
0
    def __init__(self, filename, grey=False):
        if sys.version_info > (3,):
            filename = bytes(filename, "utf8")
        self.filename = filename
        self.grey = grey
        open(filename).close()
        self._myiter = None
        self._index = None
        self.systime_offset = 0

        idx = index_file(self.filename)
        if os.path.exists(idx):
            index = json.load(open(idx))
            assert index['version'] == 2
            self.frame = index['frame']
            self.systime_offset = index['systime_offset']
        else:
            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
            lib.mkv_close(m)

            with open(idx, 'w') as fd:
                json.dump({'frame': self.frame,
                           'systime_offset': self.systime_offset,
                           'version': 2}, fd)
Example #4
0
 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
     with decode_open_lock:
         self.p = lib.decode_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)
Example #5
0
 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
     with decode_open_lock:
         self.p = lib.decode_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)
Example #6
0
 def __getitem__(self, item):
     if isinstance(item, slice):
         return SlicedView(self, item, {'systimes': self._sliced_systimes})
     if (item < 0):
         item += len(self)
     keyindex = item
     while self.frame[keyindex][2] == 0:
         keyindex -= 1
         assert keyindex >= 0
     pts = self.frame[item][0]
     if keyindex > self.myiter.fcnt or item < self.myiter.fcnt:
         lib.mkv_seek(self.myiter.m, self.frame[keyindex][1])
         lib.mkv_next(self.myiter.m, self.myiter.frm)
     for img in self.myiter:
         if img.pts == pts or self.mjpg_mode:
             img.index = item
             self.myiter.fcnt = item + 1
             return img
         elif img.pts > pts:
             pass  # We might get newer frames that was already in the pipe before the seek
     assert False
Example #7
0
    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)
Example #8
0
    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)
Example #9
0
    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)
Example #10
0
    def __init__(self, filename, grey=False):
        if sys.version_info > (3, ):
            filename = bytes(filename, "utf8")
        self.filename = filename
        self.grey = grey
        open(filename).close()
        self._myiter = None
        self._index = None
        self.systime_offset = 0

        idx = index_file(self.filename)
        if os.path.exists(idx):
            index = json.load(open(idx))
            assert index['version'] == 2
            self.frame = index['frame']
            self.systime_offset = index['systime_offset']
        else:
            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
            lib.mkv_close(m)

            with open(idx, 'w') as fd:
                json.dump(
                    {
                        'frame': self.frame,
                        'systime_offset': self.systime_offset,
                        'version': 2
                    }, fd)