def decode_frame(self):
"""Decodes the next frame of the animation.
Returns:
numpy.array: The frame image.
float: The timestamp for the end of the frame.
"""
timestamp_ptr = ffi.new('int*')
buf_ptr = ffi.new('uint8_t**')
if lib.WebPAnimDecoderGetNext(self.ptr, buf_ptr, timestamp_ptr) == 0:
raise WebPError('decoding error')
size = self.anim_info.height * self.anim_info.width * 4
buf = ffi.buffer(buf_ptr[0], size)
arr = np.copy(np.frombuffer(buf, dtype=np.uint8))
arr = np.reshape(arr, (self.anim_info.height, self.anim_info.width, 4))
# timestamp_ms contains the _end_ time of this frame
timestamp_ms = timestamp_ptr[0]
return arr, timestamp_ms
def buffer(self):
buf = ffi.buffer(self._data_ref, self.size)
return buf