vpx/vp9/common/vp9_modecont.h

/*
 *  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.
 */


#ifndef VP9_COMMON_VP9_MODECONT_H_
#define VP9_COMMON_VP9_MODECONT_H_

extern const int vp9_default_mode_contexts[INTER_MODE_CONTEXTS][4];
#endif
Initial WebM release 2010-05-18 17:58:33 +02:00			`/*`
Use WebM in copyright notice for consistency Changes 'The VP8 project' to 'The WebM project', for consistency with other webmproject.org repositories. Fixes issue #97. Change-Id: I37c13ed5fbdb9d334ceef71c6350e9febed9bbba 2010-09-09 14:16:39 +02:00			`* Copyright (c) 2010 The WebM project authors. All Rights Reserved.`
Initial WebM release 2010-05-18 17:58:33 +02:00			`*`
cosmetics: trim trailing whitespace When the license headers were updated, they accidentally contained trailing whitespace, so unfortunately we have to touch all the files again. Change-Id: I236c05fade06589e417179c0444cb39b09e4200d 2010-06-18 18:39:21 +02:00			`* Use of this source code is governed by a BSD-style license`
LICENSE: update with latest text Change-Id: Ieebea089095d9073b3a94932791099f614ce120c 2010-06-04 22:19:40 +02:00			`* that can be found in the LICENSE file in the root of the source`
			`* tree. An additional intellectual property rights grant can be found`
cosmetics: trim trailing whitespace When the license headers were updated, they accidentally contained trailing whitespace, so unfortunately we have to touch all the files again. Change-Id: I236c05fade06589e417179c0444cb39b09e4200d 2010-06-18 18:39:21 +02:00			`* in the file PATENTS. All contributing project authors may`
LICENSE: update with latest text Change-Id: Ieebea089095d9073b3a94932791099f614ce120c 2010-06-04 22:19:40 +02:00			`* be found in the AUTHORS file in the root of the source tree.`
Initial WebM release 2010-05-18 17:58:33 +02:00			`*/`


google style guide include guards Change-Id: I2c252f3ddcc99e96c1f5d3dab8bcb25a2a3637ea 2012-11-30 01:36:10 +01:00			`#ifndef VP9_COMMON_VP9_MODECONT_H_`
			`#define VP9_COMMON_VP9_MODECONT_H_`
Initial WebM release 2010-05-18 17:58:33 +02:00
Further experimentation with the mode context Experiments with a larger set of contexts and some clean up to replace magic numbers regarding the number of contexts. The starting values and rate of backwards adaption are still suspect and based on a small set of tests. Added forwards adjustment of probabilities. The net result of adding the new context and forward update is small compared to the old context from the legacy find_near function. (down a little on derf but up by a similar amount for HD) HOWEVER.... with the new context and forward update the impact of disabling the reverse update (which may be necessary in some use cases to facilitate parallel decoding) is hugely reduced. For the old context without forward update, the impact of turning off reverse update (Experiment was with SB off) was Derf - 0.9, Yt -1.89, ythd -2.75 and sthd -8.35. The impact was mainly at low data rates. With the new context and forward update enabled the impact for all the test sets was no more than 0.5-1% (again most at the low end). Change-Id: Ic751b414c8ce7f7f3ebc6f19a741d774d2b4b556 2012-11-16 17:31:32 +01:00			`extern const int vp9_default_mode_contexts[INTER_MODE_CONTEXTS][4];`
Initial WebM release 2010-05-18 17:58:33 +02:00			`#endif`