60cb39da86
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
16x16/8x8 sixtap/bilin functions, which does an avg instead of a
store. They may want to look and make sure this is implemented to
their satisfaction so we can optimize it best in the future.
Change-ID: I59dc84b07cbb3ccf073ac0f756d03d294cb19281
37 lines
1.6 KiB
C
37 lines
1.6 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef __INC_RECONINTER_H
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#define __INC_RECONINTER_H
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extern void vp8_build_inter_predictors_mb(MACROBLOCKD *x);
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extern void vp8_build_inter16x16_predictors_mb(MACROBLOCKD *x,
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unsigned char *dst_y,
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unsigned char *dst_u,
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unsigned char *dst_v,
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int dst_ystride,
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int dst_uvstride);
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extern void vp8_build_2nd_inter16x16_predictors_mb(MACROBLOCKD *x,
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unsigned char *dst_y,
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unsigned char *dst_u,
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unsigned char *dst_v,
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int dst_ystride,
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int dst_uvstride);
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extern void vp8_build_inter16x16_predictors_mby(MACROBLOCKD *x);
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extern void vp8_build_inter_predictors_b(BLOCKD *d, int pitch, vp8_subpix_fn_t sppf);
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extern void vp8_build_inter16x16_predictors_mbuv(MACROBLOCKD *x);
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extern void vp8_build_inter4x4_predictors_mbuv(MACROBLOCKD *x);
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#endif
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