Adjusting field of view of truncated square pyramid projection for 360-degree video

A device for coding video data, comprising:

• a memory configured to store video data;
• and
• a video coding device in communication with the memory, wherein the video coding device is configured to:
• obtain virtual reality video data representing a 360-degree view of a virtual environment, wherein the virtual reality video data includes a plurality of frames, and wherein each frame from the plurality of frames includes corresponding spherical video data;
• determine a field of view for a frame from the plurality of frames;
• determine an offset from a center of the spherical video data for the frame, the offset corresponding to the field of view;
• determine, using the offset, a projection of the spherical video data onto planes of a truncated square pyramid, wherein a base plane of the truncated square pyramid represents a front view of the spherical video data, the front view corresponding to the field of view, wherein a top plane of the truncated square pyramid represents a back view of the spherical video data, and wherein the top plane is smaller than the base plane;
• and
• map, according to the projection, the spherical video data to the planes of the truncated square pyramid, wherein each plane includes a portion of the spherical video data.

A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to perform operations including:

• obtaining virtual reality video data representing a 360-degree view of a virtual environment, wherein the virtual reality video data includes a plurality of frames, and wherein each frame from the plurality of frames includes corresponding spherical video data;
• determining a field of view for a frame from the plurality of frames;
• determining an offset from a center of the spherical video data for the frame, the offset corresponding to the field of view;
• determining, using the offset, a projection of the spherical video data onto planes of a truncated square pyramid, wherein a base plane of the truncated square pyramid represents a front view of the spherical video data, the front view corresponding to the field of view, wherein a top plane of the truncated square pyramid represents a back view of the spherical video data, and wherein the top plane is smaller than the base plane;
• and
• mapping, according to the projection, the spherical video data to the planes of the truncated square pyramid, wherein each plane includes a portion of the spherical video data.

An apparatus comprising:

• means for obtaining virtual reality video data representing a 360-degree view of a virtual environment, wherein the virtual reality video data includes a plurality of frames, and wherein each frame from the plurality of frames includes corresponding spherical video data;
• means for determining a field of view for a frame from the plurality of frames;
• means for determining an offset from a center of the spherical video data for the frame, the offset corresponding to the field of view;
• means for determining, using the offset, a projection of the spherical video data onto planes of a truncated square pyramid, wherein a base plane of the truncated square pyramid represents a front view of the spherical video data, the front view corresponding to the field of view, wherein a top plane of the truncated square pyramid represents a back view of the spherical video data, and wherein the top plane is smaller than the base plane;
• and
• means for mapping, according to the projection, the spherical video data to the planes of the truncated square pyramid, wherein each plane includes a portion of the spherical video data.