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Zoe Liu authored
This patch removed the experiment of BIDIR_PRED and merged the feature into the experiment of EXT_REFS: (1) Each frame now has up to 6 reference frames, namely LAST_FRAME, LAST2_FRAME, LAST3_FRAME, GOLDEN_FRAME, (forward) and BWDREF_FRAME, ALTREF_FRAME (backward); LAST4_FRAME has been removed; (2) First pass still keeps the 8 updates: KF_UPDATE, LF_UPDATE, GF_UPDATE, ARF_UPDATE, OVERLAY_UPDATE, and BRF_UPDATE, LAST_BIPRED_UPDATE, BI_PRED_UPDATE; (3) show_existing_frame==1 is supported in the experiment of EXT_REFS; (4) New encoding modes are added for both single-ref and compound cases, through the use of the 2 extra forward references (LAST2 & LAST3) and the 1 extra backward reference (BWDREF). RD performance wise, using Overall PSNR: Avg/BDRate Bipred only Prev EXT_REFS Current EXT_REFS with bipred lowres: -3.474/-3.324 -1.748/-1.586 -4.613/-4.387 derflr: -2.097/-1.353 -1.439/-1.215 -3.120/-2.252 midres: -2.129/-1.901 -1.345/-1.185 -2.898/-2.636 If in vp10/encoder/firstpass.h, change BFG_INTERVAL from 2 to 3, i.e. to use 2 bi-predictive frames than 1, a further improvement may be obtained: Current EXT_REFS with bipred 1 bi-predictive frame 2 bi-predictive frames lowres: -4.613/-4.387 -4.675/-4.465 derflr: -3.120/-2.252 -3.333/-2.516 midres: -2.898/-2.636 -3.406/-3.095 Change-Id: Ib06fe9ea0a5cfd7418a1d79b978ee9d80bf191cb
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