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Ronald S. Bultje authored
This patch introduces the concept of dual inter16x16 prediction. A 16x16 inter-predicted macroblock can use 2 references instead of 1, where both references use the same mvmode (new, near/est, zero). In the case of newmv, this means that two MVs are coded instead of one. The frame can be encoded in 3 ways: all MBs single-prediction, all MBs dual prediction, or per-MB single/dual prediction selection ("hybrid"), in which case a single bit is coded per-MB to indicate whether the MB uses single or dual inter prediction. In the future, we can (maybe?) get further gains by mixing this with Adrian's 32x32 work, per-segment dual prediction settings, or adding support for dual splitmv/8x8mv inter prediction. Gain (on derf-set, CQ mode) is ~2.8% (SSIM) or ~3.6% (glb PSNR). Most gain is at medium/high bitrates, but there's minor gains at low bitrates also. Output was confirmed to match between encoder and decoder. Note for optimization people: this patch introduces a 2nd version of 1...60cb39da
#### Copyright (c) 2010 The WebM project authors. All Rights Reserved.#### Use of this source code is governed by a BSD-style license## that can be found in the LICENSE file in the root of the source## tree. An additional intellectual property rights grant can be found## in the file PATENTS. All contributing project authors may## be found in the AUTHORS file in the root of the source tree.##INSTALL_MAPS += docs/% docs/%INSTALL_MAPS += src/% %INSTALL_MAPS += % %# Static documentation authored in doxygenCODEC_DOX := mainpage.dox \ keywords.dox \ usage.dox \ usage_cx.dox \ usage_dx.dox \# Other doxy files sourced in MarkdownTXT_DOX = $(call enabled,TXT_DOX)%.dox: %.txt @echo " [DOXY] $@" @$(SRC_PATH_BARE)/examples/gen_example_doxy.php \ $(@:.dox=) "$($@.DESC)" > $@ < $<EXAMPLE_PATH += $(SRC_PATH_BARE) #for CHANGELOG, README, etcEXAMPLE_PATH += $(SRC_PATH_BARE)/examplesdoxyfile: $(if $(findstring examples, $(ALL_TARGETS)),examples.doxy)doxyfile: libs.doxy_template libs.doxy @echo " [CREATE] $@" @cat $^ > $@ @echo "STRIP_FROM_PATH += $(SRC_PATH_BARE) $(BUILD_ROOT)" >> $@ @echo "INPUT += $(addprefix $(SRC_PATH_BARE)/,$(CODEC_DOX))" >> $@; @echo "INPUT += $(TXT_DOX)" >> $@; @echo "EXAMPLE_PATH += $(EXAMPLE_PATH)" >> $@CLEAN-OBJS += doxyfile $(wildcard docs/html/*)docs/html/index.html: doxyfile $(CODEC_DOX) $(TXT_DOX) @echo " [DOXYGEN] $<" @doxygen $<DOCS-yes += docs/html/index.htmlDIST-DOCS-yes = $(wildcard docs/html/*)DIST-DOCS-$(CONFIG_CODEC_SRCS) += $(addprefix src/,$(CODEC_DOX))DIST-DOCS-$(CONFIG_CODEC_SRCS) += src/libs.doxy_templateDIST-DOCS-yes += CHANGELOGDIST-DOCS-yes += README