Constant slice header parameters signaled at higher syntax level for video coding

A device for decoding video data, the device comprising:

• a memory configured to store the video data;
• and
• one or more processors implemented in circuitry and communicatively coupled to the memory, the one or more processors being configured to:
• determine whether a maximum number of merge candidates for a first slice of the video data is equal to 2;
• determine, without receipt of explicit signaling, a value of a first syntax element to be equal to 0 based at least in part on the maximum number of merge candidates for the first slice being equal to 2, the value of the first syntax element being equal to the maximum number of merge candidates minus a maximum number of merge candidates of a non-rectangular coding mode for video data to which the first syntax element is applicable;
• and
• decode the first slice based on the maximum number of merge candidates and the first syntax element.

A non-transitory computer-readable storage medium having instructions stored thereon which, when executed by one or more processors, cause the one or more processors to:

• determine whether a maximum number of merge candidates for a first slice of the video data is equal to 2;
• determine, without receipt of explicit signaling, a value of a first syntax element to be equal to 0 a second value based at least in part on the maximum number of merge candidates for the first slice being equal to 2, the value of the first syntax element being equal to the maximum number of merge candidates minus a maximum number of merge candidates of a non-rectangular coding mode for video data to which the first syntax element is applicable;
• and
• decode the first slice based on the maximum number of merge candidates and the first syntax element.

A device for decoding video data, the device comprising:

• means for determining whether a maximum number of merge candidates for a first slice of the video data is equal to 2;
• means for determining, without receipt of explicit signaling, a value of a first syntax element to be equal to 0 based at least in part on the maximum number of merge candidates for the first slice being equal to 2, the value of the first syntax element being equal to the maximum number of merge candidates minus a maximum number of merge candidates of a non-rectangular coding mode for video data to which the first syntax element is applicable;
• and
• means for decoding the first slice based on the maximum number of merge candidates and the value of the first syntax element.