Sample derivation for 360-degree video coding

A device for decoding of a video content comprising:

• a processor configured to:
• obtain a picture associated with the video content in video bitstream;
• obtain a wraparound enabled indication that indicates whether a horizontal wraparound motion compensation is enabled;
• based on the obtained wraparound enabled indication, determine whether the horizontal wraparound motion compensation is enabled;
• based on a determination that the horizontal wraparound motion compensation is enabled, parse the video data to obtain an offset indication of a reference sample wraparound offset;
• determine the reference sample wraparound offset of a current sample in the picture;
• determine a reference sample location for the current sample based on the reference sample wraparound offset, a picture width of the picture, and a current sample location;
• and predict the current sample based on the reference sample location.

A method for encoding of a video content, the method comprising:

• obtaining a picture associated with the video content in a video data;
• obtaining a current sample location, wherein the current sample location is associated with a current sample in the obtained picture;
• determining a reference sample location, wherein the reference sample location is associated with the current sample location;
• determining that a reference sample is located outside of the picture based on the determined reference sample location, a picture width of the picture, and the current sample location, wherein the reference sample is associated with the reference sample location;
• and based on the determination that the reference sample is located outside of the picture, including a wraparound enabled indication and an offset indication in the video data, wherein the wraparound enabled indication indicates whether a horizontal wraparound motion compensation is enabled, and wherein the offset indication is for a reference sample wraparound offset.

A device for encoding of a video content comprising:

• a processor configured to:
• obtain a picture associated with the video content in a video data;
• obtain a current sample location, wherein the current sample location is associated with a current sample in the obtained picture;
• determine a reference sample location, wherein the reference sample location is associated with the current sample location;
• determine that a reference sample is located outside of the picture based on the determined reference sample location, a picture width of the picture, and the current sample location, wherein the reference sample is associated with the reference sample location;
• and based on the determination that the reference sample is located outside of the picture, include a wraparound enabled indication and an offset indication in the video data, wherein the wraparound enabled indication indicates whether a horizontal wraparound motion compensation is enabled, and wherein the offset indication is for a reference sample wraparound offset.

A method comprising:

• obtaining a picture associated with a video content in a video data;
• obtaining a wraparound enabled indication that indicates whether a horizontal wraparound motion compensation is enabled;
• based on the obtained wraparound enabled indication, determining whether the horizontal wraparound motion compensation is enabled;
• based on a determination that the horizontal wraparound motion compensation is enabled, obtaining a size indication, wherein the size indication is configured to indicate a first width of a guard band in the picture and a second width of the guard band in the picture, and wherein the first width of the guard band is in luma samples, and the second width of the guard band is in luma samples;
• obtaining a face width of the picture based on the size indication, wherein the face width of the picture is obtained based on the first width of the guard band in luma samples and the second width of the guard band in luma samples;
• based on the obtained size indication and the face width of the picture, determining a reference sample wraparound offset of a current sample in the picture;
• determining a reference sample location for the current sample based on the reference sample wraparound offset, a picture width of the picture, and a current sample location;
• and predicting the current sample based on the reference sample location.

An apparatus comprising:

• a processor configured to:
• obtain a picture associated with a video content in video data;
• obtain a wraparound enabled indication that indicates whether a horizontal wraparound motion compensation is enabled;
• based on the obtained wraparound enabled indication, determine whether the horizontal wraparound motion compensation is enabled;
• based on a determination that the horizontal wraparound motion compensation is enabled, obtain a size indication, wherein the size indication is configured to indicate a first width of a guard band in the picture and a second width of the guard band in the picture, and wherein the first width of the guard band is in luma samples, and the second width of the guard band is in luma samples;
• obtain a face width of the picture based on the size indication, wherein the face width of the picture is obtained based on the first width of the guard band in luma samples and the second width of the guard band in luma samples;
• based on the obtained size indication and the face width of the picture, determine a reference sample wraparound offset of a current sample in the picture;
• determine a reference sample location for the current sample based on the reference sample wraparound offset, a picture width of the picture, and a current sample location;
• and predict the current sample based on the reference sample location.