Method and system for single loop multilayer coding with subpicture partitioning
A versatile video coding (VVC) method includes obtaining a plurality of video sources; encoding the plurality of video sources into a bitstream including a plurality of independent layers corresponding to the plurality of video sources; generating signaling information on the plurality of independent layers and integrating the signaling information with the bitstream; and transferring the bitstream for decoding processing, wherein the signaling information is to be used in the decoding process to enable a single decoder instance to decode the plurality of independent layers similar to a single-layer bitstream. The signaling information includes at least a video parameter set (VPS), and the VPS includes a flag inbl_one_pic_per_poc_flag equal to 1, which specifies that the bitstream contains independent layers and there is one and only one coded picture with a particular picture order count (POC) value in a same coded video sequence (CVS) among all layers.
1. A video processing method, comprising:
obtaining a plurality of video sources, the plurality of video sources including a first coded region and a second coded region;
encoding a bitstream of the plurality of video sources into a plurality of independent layers, the independent layers including a first independent layer and a second independent layer, wherein the bitstream is encoded by:
encoding a portion of the first coded region into the first independent layer with a first layer ID and a first POC (picture order count) value; and
encoding a portion of the second coded region into the second independent layer with a second layer ID different than the first layer ID and a second POC value different than the first POC value;
generating signaling information on the plurality of independent layers; and
transferring the bitstream along with the signaling information for decoding processing.
2. The video processing method of claim 1 , wherein the bitstream is encoded further by:
encoding a second portion of the first encoded region into the first independent layer with the first layer ID but with a third POC value, the third independent layer being different than the first POC value and different than the second POC value.
3. The video processing method of claim 1 , wherein the signaling information includes one or more of:
a first parameter, specifying a number of layers in the plurality of independent layers;
a second parameter, specifying that the plurality of independent layers are independently coded; and
a third parameter, specifying that a profile-tier-level and hypothetical-reference-decoder (HRD) parameters apply collectively to the plurality of independent layers.
4. The video processing method of claim 1 , wherein the signaling information further includes mapping information to connect the first coded region to the first independent layer and to connect the second coded region to the second independent layer.
5. The video processing method of claim 1 , wherein the signaling information further includes:
an offset value (x, y) of a left-top position of at least one of the first and the second independent layer; or
a height or a width of the at least one of the first and the second independent layer.
6. The video processing method of claim 1 , wherein the signaling information further includes 4-neighbor (top, right, bottom, and left) information of at least one of the first and the second independent layers.
7. The video processing method of claim 1 , wherein the signaling information further includes a parameter, indicating that there is one and only one picture per each POC value along all layers in the plurality of independent layers.
8. A video processing apparatus, comprising: a memory storing computer program instructions; and a processor coupled to the memory and configured to execute the computer program instructions and perform:
obtaining a plurality of video sources, the plurality of video sources including a first coded region and a second coded region;
encoding a bitstream of the plurality of video sources into a plurality of independent layers, the independent layers including a first independent layer and a second independent layer, wherein the bitstream is encoded by:
encoding a portion of the first coded region into the first independent layer with a first layer ID and a first POC (picture order count) value; and
encoding a portion of the second coded region into the second independent layer with a second layer ID different than the first layer ID and a second POC value different than the first POC value;
generating signaling information on the plurality of independent layers; and
transferring the bitstream along with the signaling information for decoding processing.
9. The video processing apparatus of claim 8 , wherein the bitstream is encoded further by:
encoding a second portion of the first encoded region into the first independent layer with the first layer ID but with a third POC value, the third independent layer being different than the first POC value and different than the second POC value.
10. The video processing apparatus of claim 8 , wherein the signaling information includes one or more of:
a first parameter, specifying a number of layers in the plurality of independent layers;
a second parameter, specifying that the plurality of independent layers are independently coded; and
a third parameter, specifying that a profile-tier-level and hypothetical-reference-decoder (HRD) parameters apply collectively to the plurality of independent layers.
11. The video processing apparatus of claim 8 , wherein the signaling information further includes mapping information to connect the first coded region to the first independent layer and to connect the second coded region to the second independent layer.
12. The video processing apparatus of claim 8 , wherein the signaling information further includes:
an offset value (x, y) of a left-top position of at least one of the first and the second independent layer; or
a height or a width of the at least one of the first and the second independent layer.
13. The video processing apparatus of claim 8 , wherein the signaling information further includes 4-neighbor (top, right, bottom, and left) information of at least one of the first and the second independent layers.
14. The video processing apparatus of claim 8 , wherein the signaling information further includes a parameter, indicating that there is one and only one picture per each POC value along all layers in the plurality of independent layers.
15. A non-transitory computer-readable storage medium storing computer program instructions executable by at least one processor to perform:
obtaining a plurality of video sources, the plurality of video sources including a first coded region and a second coded region;
encoding a bitstream of the plurality of video sources into a plurality of independent layers, the independent layers including a first independent layer and a second independent layer, wherein the bitstream is encoded by:
encoding a portion of the first coded region into the first independent layer with a first layer ID and a first POC (picture order count) value; and
encoding a portion of the second coded region into the second independent layer with a second layer ID different than the first layer ID and a second POC value different than the first POC value;
generating signaling information on the plurality of independent layers; and
transferring the bitstream along with the signaling information for decoding processing.
16. The non-transitory computer-readable storage medium of claim 14 , wherein the bitstream is encoded further by:
encoding a second portion of the first encoded region into the first independent layer with the first layer ID but with a third POC value, the third independent layer being different than the first POC value and different than the second POC value.
17. The non-transitory computer-readable storage medium of claim 14 , wherein the signaling information includes one or more of:
a first parameter, specifying a number of layers in the plurality of independent layers;
a second parameter, specifying that the plurality of independent layers are independently coded; and
a third parameter, specifying that a profile-tier-level and hypothetical-reference-decoder (HRD) parameters apply collectively to the plurality of independent layers.
18. The non-transitory computer-readable storage medium of claim 14 , wherein the signaling information further includes mapping information to connect the first coded region to the first independent layer and to connect the second coded region to the second independent layer.
19. The non-transitory computer-readable storage medium of claim 14 , wherein the signaling information further includes:
an offset value (x, y) of a left-top position of at least one of the first and the second independent layer; or
a height or a width of the at least one of the first and the second independent layer.
20. The non-transitory computer-readable storage medium of claim 14 , wherein the signaling information further includes 4-neighbor (top, right, bottom, and left) information of at least one of the first and the second independent layers.