Solução arquitetural para a decodificação intraquadro do padrão de codoficação AV1

Abstract

Digital videos are increasingly present in our daily lives, precisely because of the increase in the number of electronic devices that are able to handle the videos and also by the reduction of the cost of the production of the devices. Video encoding aims to reduce video size by respecting the relationship between video quality and bitstream size. To meet these requirements, numerous encoders have been developed, each encoder aiming to meet the demand and the performance constraints in force at the time of its development. In this way, we can cite some important coders currently: H.264 and HEVC and VP9. Such coders are defined by international standardization bodies and their use is subject to the payment of royalties. As a result, Google, Xiph, and Cisco started an alliance called AOMedia (Alliance for Open Media) and defined a new video encoder, AV1 (AOMedia Video 1). The AV1 proposal is to be a royalty-free and open-source encoder. In current video encoders, the intra-frame prediction is the module responsible for reducing spatial redundancy between neighboring samples within the same frame. AV1 has introduced new techniques for intra-frame prediction, making it more complex and efficient.Among the new techniques we can mention the Croma from Luma mode and the intrafilters, in addition, the AV1 extended the intra-frame prediction for 19 block sizes. The architecture developed in this work aims to approach an architectural solution for the intra-frame decoding of the coding standard AV1. In the course of the dissertation will be explained the modeling strategy used to develop the architecture as well as the modules that compose it. The intraframe decoder architecture AV1 (DIAV1) was synthesized in ASIC considering three case studies, which aim to portray the operation of the architecture from pessimistic scenarios to more realistic scenarios. The results show that DIAV1 can operate in these three scenarios having a dissipated power that can vary from 76.03 mW to 16.9 mW, according to the desired scenario.