Encoder, decoder and corresponding methods for improved compression ratios
A system and method of decoding of a video or picture bitstream implemented by a decoding device are described. The bitstream can include data representing a current video coding layer. Furthermore, when determining that the current video coding layer is the only one layer in the bitstream, the method can include using the identifier of a NAL unit of the current video coding layer as the identifier of the current video coding layer.
1. A method of decoding a video or picture bitstream by a decoding device, comprising:
determining that a current video coding layer is the only one layer in the bitstream when video parameter set (VPS) is not present in the bitstream; and
when determining that the current video coding layer is the only one layer in the bitstream, using a layer identifier of a network abstraction layer (NAL) unit of the current video coding layer as an identifier of the current video coding layer, and the identifier of the current video coding layer is presented by vps_layer_id.
2. The method of claim 1 , the method further comprising:
predicting a current slice of the current video coding layer using the identifier of the current video coding layer.
3. The method of claim 1 , the method further comprising:
when determining that the bitstream comprises multiple layers, obtaining the identifier of the current video coding layer by parsing the bitstream.
4. The method of claim 2 , wherein the decoding device constructs one or more reference picture lists of the current slice of the current video coding layer using the identifier of the current video coding layer;
and wherein the predicting the current slice of the current video coding layer using the identifier of the current video coding layer comprises: predicting the current slice using the one or more reference picture lists.
5. The method of claim 1 , wherein the NAL unit of the current video coding layer is a video coding layer (VCL) NAL unit of the current video coding layer present in the bitstream.
6. The method of claim 5 , wherein the VCL NAL unit of the current video coding layer is any one VCL NAL unit of the current video coding layer present in the bitstream.
7. The method of claim 1 , the method further comprising:
deriving a value of OutputLayerIDINOls[0][0] based on the vps_layer_id.
8. A method of encoding a video or picture bitstream by an encoding device, comprising:
determining that a current video coding layer is the only one layer in the bitstream when video parameter set (VPS) is not present in the bitstream; and
when determining that the current video coding layer is the only one layer in the bitstream, using a layer identifier of a network abstraction layer (NAL) unit of the current video coding layer as an identifier of the current video coding layer, and the identifier of the current video coding layer is presented by vps_layer_id.
9. The method of claim 8 , the method further comprises:
predicting a current slice of the current video coding layer using the identifier of the current video coding layer.
10. The method of claim 9 , wherein the encoding device constructs one or more reference picture lists of the current slice of the current video coding layer using the identifier of the NAL unit of the current video coding layer as the identifier of the current video coding layer;
and wherein the predicting the current slice of the current video coding layer using the identifier of the current video coding layer comprises: predicting the current slice using the one or more reference picture lists.
11. The method of claim 8 , the method further comprises:
when determining that the bitstream comprises multiple layers, encoding the identifier of the current video coding layer into the bitstream.
12. The method of claim 8 , wherein the NAL unit of the current video coding layer is a video coding layer (VCL) NAL unit of the current video coding layer present in the bitstream.
13. The method of claim 12 , wherein the VCL NAL unit of the current video coding layer is any one VCL NAL unit of the current video coding layer present in the bitstream.
14. A coding device, comprising:
one or more processors; and
a non-transitory computer-readable storage medium coupled to the one or more processors and storing programming for execution by the one or more processors, wherein the programming, when executed by the one or more processors, causes the coding device to perform operations comprising:
determining that a current video coding layer is the only one layer in the bitstream when video parameter set (VPS) is not present in the bitstream; and
when determining that the current video coding layer is the only one layer in the bitstream, using a layer identifier of a network abstraction layer (NAL) unit of the current video coding layer as an identifier of the current video coding layer, and the identifier of the current video coding layer is presented by vps_layer_id.
15. The device of claim 14 , wherein the programming, when executed by the one or more processors, further causes the coding device to perform operations comprising:
predicting a current slice of the current video coding layer using the identifier of the current video coding layer.
16. The device of claim 15 , wherein one or more reference picture lists of the current slice of the current video coding layer are constructed by the coding device using the identifier of the current video coding layer;
and wherein the predicting the current slice of the current video coding layer using the identifier of the current video coding layer comprises: predicting the current slice using the one or more reference picture lists.
17. The device of claim 14 , wherein the programming, when executed by the one or more processors, further causes the coding device to perform operations comprising:
when determining that the bitstream comprises multiple layers, obtaining the identifier of the current video coding layer by parsing the bitstream.
18. The device of claim 14 , wherein the NAL unit of the current video coding layer is a video coding layer (VCL) NAL unit of the current video coding layer present in the bitstream.
19. The device of claim 18 , wherein the VCL NAL unit of the current video coding layer is any one VCL NAL unit of the current video coding layer present in the bitstream.
20. The device of claim 14 , wherein the determining that the current video coding layer is the only one layer in the bitstream comprises: when sps_video_parameter_set_id is equal to 0, determining that the current video coding layer is the only one layer in the bitstream.