Efficient transforms and transposes for rate-distortion optimization and reconstruction in video encoders

Abstract

Disclosed approaches may provide for non-blocking video processing pipelines that have the ability to efficiently share transform hardware resources. Transform hardware resources may be shared across processing parameters, such as pixel block dimensions, transform types, video stream bit depths, and/or multiple coding formats, as well as for inter-frame and intra-frame encoding. The video processing pipeline may be divided into phases, each phase having half-butterfly circuits to perform a respective portion of computations of a transform. The phases may be selectable and configurable to perform transforms for multiple different combinations of the processing parameters. In each configuration, the phases may be capable of performing a transform by a sequential pass through at least some of the phases resulting in high throughput. Approaches are also described related to improving the performance and efficiency of transpose operations of transforms.