Virtual field buffer based decoding

摘要

Aspects of virtual field buffer based decoding are described. In one embodiment, a current picture field is read from a coded picture buffer comprising coded pictures of video, for example. The current picture may be associated with a top or bottom field polarity. According to decoding and picture output orders, the current picture field is assigned to an available field entry of a virtual field buffer, and an available frame index of a virtual frame map is assigned to the current picture field. The assignment of the available frame index to the current picture field is indicated to a decoder that decodes the current picture field with reference to the assigned frame index. According to aspects of the embodiments described herein, rather than determining complimentary picture fields after decoding, the assignment of complimentary picture fields to virtual frame indexes before decoding provides certain efficiencies.

主权项

1. A method of virtual field buffer based decoding, comprising:
according to a first decoding order, reading a current picture field from a coded picture buffer, the current picture field having a field polarity; assigning the current picture field to an available field entry of a virtual field buffer; assigning an available frame index of a virtual frame map to the current picture field; determining that a counter of unpaired pictures of an opposite field polarity as the current picture field is zero; responsive to the counter being zero, assigning the frame index of the current picture field to an available frame index of the virtual frame map and incrementing a counter of unpaired pictures of a same field polarity as the current picture field; and decoding, by a decoder, the current picture field in a second decoding order based on the assigned frame index of the current picture field.