83b47af18d
This patch added two features to improve entropy coding efficiency for coefficient tokens. 1. Choose 1 of 4 default probability tables based on q-index for key-frames. It is ported from nextgen branch: https://chromium-review.googlesource.com/#/c/280586/ 2. Do backward update after each superblock (64X64) row using subframe token counts. Coding gain: 0.1% on lowres; 0.42% on midres; 0.36% on hdres. Much larger gain for key-frames: 2.6%, 2.3%, 1.7%. Design doc: go/huisu-entropy Change-Id: Ia3b6a615636be09247d70e4c520405637561532b
58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
/*
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* Copyright (c) 2013 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 VP10_ENCODER_SUBEXP_H_
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#define VP10_ENCODER_SUBEXP_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "vpx_dsp/prob.h"
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struct vpx_writer;
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void vp10_write_prob_diff_update(struct vpx_writer *w,
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vpx_prob newp, vpx_prob oldp);
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void vp10_cond_prob_diff_update(struct vpx_writer *w, vpx_prob *oldp,
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const unsigned int ct[2]);
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int vp10_prob_diff_update_savings_search(const unsigned int *ct,
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vpx_prob oldp, vpx_prob *bestp,
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vpx_prob upd);
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int vp10_prob_diff_update_savings_search_model(const unsigned int *ct,
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const vpx_prob *oldp,
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vpx_prob *bestp,
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vpx_prob upd,
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int stepsize);
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int vp10_cond_prob_diff_update_savings(vpx_prob *oldp,
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const unsigned int ct[2]);
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#if CONFIG_ENTROPY
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int vp10_prob_update_search_subframe(unsigned int ct[][2],
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vpx_prob oldp, vpx_prob *bestp,
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vpx_prob upd, int n);
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int vp10_prob_update_search_model_subframe(unsigned int ct[ENTROPY_NODES]
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[COEF_PROBS_BUFS][2],
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const vpx_prob *oldp,
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vpx_prob *bestp, vpx_prob upd,
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int stepsize, int n);
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#endif // CONFIG_ENTROPY
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VP10_ENCODER_SUBEXP_H_
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