1. An apparatus (20) configured to code video data, the apparatus (20) comprising: a video encoding unit (47) configured to code samples of a block of video data using quantized pulse code modulation according to an output bit-depth, wherein the samples of the block of video data have a bit-depth different than the output bit-depth so as to introduce loss to the samples in a frame having both lossy and lossless parts, wherein the video encoding unit (47) comprises: a quantization unit (49) configured to quantize the samples of the block of video data according to a quantization step defining an amount of quantization to produce the output bitdepth; and a modulation unit (51) configured to code the quantized samples using pulse code modulation.

2. The apparatus (20) of claim 1, wherein the video coding unit (47) is further configured to select the quantization step for the quantized samples to define the output bitdepth.

3. The apparatus (20) of claim 1 or 2, wherein the quantization unit (49) is configured to quantize samples of multiple blocks of video data according to a common quantization step and the modulation unit (51) is configured to code the quantized samples using pulse code modulation in the multiple blocks of video data.

4. The apparatus (20) of claims 1 or 2 , wherein the quantization unit (49) is configured to quantize samples of a first block of video data according to a first quantization step and to quantize samples of a second block of video data according to a second quantization step different from the first quantization step; and the modulation unit (51) is configured to code the quantized samples in the first and second blocks of video data using pulse code modulation. 31 227926/3

5. An apparatus (30) configured to decode a coded block of video data, the apparatus (30) comprising: a video decoding unit (71) configured to decode samples of the coded block of video data that have been encoded with quantized pulse code modulation according to an output bit-depth, wherein the samples of the block of video data have a bit-depth different than the output bit-depth so as to introduce loss to the samples, wherein the video decoding unit (71) comprises: a demodulation unit (73) configured to decode the samples of the coded block of video data using pulse code demodulation; and an inverse quantization unit (75) configured to inverse quantize the decoded samples according to a quantization step.

6. The apparatus (30) of claim 5, wherein the quantization step is based on the output bit-depth.

7. The apparatus (30) of claim 6, wherein the inverse quantization unit (73) is further configured to inverse quantize the decoded samples according to the quantization step and a rounding offset.

8. The apparatus (20, 30) of any preceding claim, wherein the quantization step is determined based on one or more of the following characteristics of the video data; frame spatial resolution, quantization parameter, coding structure, frame rate, frame type or input bit depth.

9. A method (100) for coding video data, the method (100) comprising: coding samples (121) of a block of video data using quantized pulse code modulation according to an output bit-depth, wherein the samples of the block of video data have a bitdepth different than the output bit-depth so as to introduce loss to the samples in a frame having both lossy and lossless parts, wherein coding samples of the block of video data using quantized pulse code modulation according to an output bit-depth comprises: quantizing the samples of the block of video data according to a quantization step (112) defining an amount of quantization to produce the output bit-depth; and pulse code modulating the quantized samples (124). 32 227926/310. The method (100) of claim 9, wherein coding samples of a block of video data using quantized pulse code modulation (121) comprises: quantizing samples of multiple blocks of video data according to a common quantization step; and pulse code modulating the quantized samples in the multiple blocks of video data

11. The method (100) of claim 9, wherein coding samples of a block of video data using quantized pulse code modulation comprises (121): quantizing samples of a first block of video data according to a first quantization step; quantizing samples of a second block of video data according to a second quantization step different from the first quantization step; and pulse code modulating the quantized samples in the first and second blocks of video data

12. A method (150) for decoding a coded block of video data, the method (150) comprising: decoding (161) samples of the coded block of video data that have been encoded with quantized pulse code modulation according to an output bit-depth, wherein the samples of the block of video data have a bit-depth different than the output bit-depth so as to introduce loss to the samples, wherein decoding samples of a block of video data according to an output bitdepth comprises: decoding the samples of the coded block of video data using pulse code demodulation (162); and inverse quantizing the decoded samples according to a quantization step (164)

13. The method (150) of claim 12, wherein the quantization step is based on the output bit-depth and/or, wherein inverse quantizing the decoded samples comprises inverse quantizing the decoded samples according to the quantization step and a rounding offset

14. The method (100, 150) of any of claims 9 to 13, further comprising: determining the quantization step based on one or more of the following characteristics of the video data; frame spatial resolution, quantization parameter, coding structure, frame rate, frame type or input bit depth.']