Signaling of scalability parameters in video bitstream

A device for decoding an encoded video bitstream, the device comprising:

• at least one memory configured to store program code;
• and
• at least one processor configured to read the program code and operate as instructed by the program code, the program code including:
• first obtaining code configured to cause the at least one processor to obtain a coded video sequence from the encoded video bitstream;
• second obtaining code configured to cause the at least one processor to obtain a first syntax element indicating a number of a plurality of layers included in the coded video sequence;
• third obtaining code configured to cause the at least one processor to obtain a second syntax element indicating whether the plurality of layers included in the coded video sequence are all independent layers;
• fourth obtaining code configured to cause the at least one processor to, based on the first syntax element indicating that the number of the plurality of layers is greater than one, and the second syntax element indicating that the plurality of layers are not all the independent layers, obtaining a third syntax element indicating an output mode;
• first determining code configured to cause the at least one processor to determine the output mode based on the third syntax element;
• second determining code configured to cause the at least one processor to determine one or more output layers from among the plurality of layers based on the determined output mode;
• and
• outputting code configured to cause the at least one processor to output the one or more output layers.

A non-transitory computer-readable medium storing instructions, the instructions comprising:

• one or more instructions that, when executed by one or more processors of a device for decoding an encoded video bitstream, cause the one or more processors to:
• obtain a coded video sequence from the encoded video bitstream;
• obtain a first syntax element indicating a number of a plurality of layers included in the coded video sequence;
• obtain a second syntax element indicating whether the plurality of layers included in the coded video sequence are all independent layers;
• based on the first syntax element indicating that the number of the plurality of layers is greater than one, and the second syntax element indicating that the plurality of layers are not all the independent layers, obtaining a third syntax element indicating an output mode;
• determine the output mode based on the third syntax element;
• determine one or more output layers from among the plurality of layers based on the determined output mode;
• and
• output the one or more output layers.