Decoder, encoder and method for supporting adaptive dependent quantization at transform coefficient levels

A decoder is configured to decode a residual level representing a prediction residual from a data stream, and sequentially inverse quantize the residual level by selecting a quantizer from among a set of default quantizers in dependence on a current transition state, inverse quantizing the current residual level using the quantizer to obtain an inverse quantized residual value, and decoding the inverse quantized residual value from the set of default quantizers. The current transition state is updated according to characteristics of the current residual level obtained by applying a binary function to the current residual level and according to quantization mode information contained in the data stream. The decoder is configured to reconstruct the media signal using the dequantized residual value. A current transition state is in accordance with a full-shot mapping from a combined domain of a set of one or more transition states having characteristics of a current residual level to a set of one or more transit