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media/libvpx/vp9/encoder/vp9_treewriter.c@b8a032363ba2 (annotated)

media/libvpx/vp9/encoder/vp9_treewriter.c

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/*
michael@0	2	* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0	3	*
michael@0	4	* Use of this source code is governed by a BSD-style license
michael@0	5	* that can be found in the LICENSE file in the root of the source
michael@0	6	* tree. An additional intellectual property rights grant can be found
michael@0	7	* in the file PATENTS. All contributing project authors may
michael@0	8	* be found in the AUTHORS file in the root of the source tree.
michael@0	9	*/
michael@0	10
michael@0	11	#include "vp9/encoder/vp9_treewriter.h"
michael@0	12
michael@0	13	static void cost(int *costs, vp9_tree tree, const vp9_prob *probs,
michael@0	14	int i, int c) {
michael@0	15	const vp9_prob prob = probs[i / 2];
michael@0	16	int b;
michael@0	17
michael@0	18	for (b = 0; b <= 1; ++b) {
michael@0	19	const int cc = c + vp9_cost_bit(prob, b);
michael@0	20	const vp9_tree_index ii = tree[i + b];
michael@0	21
michael@0	22	if (ii <= 0)
michael@0	23	costs[-ii] = cc;
michael@0	24	else
michael@0	25	cost(costs, tree, probs, ii, cc);
michael@0	26	}
michael@0	27	}
michael@0	28
michael@0	29	void vp9_cost_tokens(int *costs, const vp9_prob *probs, vp9_tree tree) {
michael@0	30	cost(costs, tree, probs, 0, 0);
michael@0	31	}
michael@0	32
michael@0	33	void vp9_cost_tokens_skip(int *costs, const vp9_prob *probs, vp9_tree tree) {
michael@0	34	assert(tree[0] <= 0 && tree[1] > 0);
michael@0	35
michael@0	36	costs[-tree[0]] = vp9_cost_bit(probs[0], 0);
michael@0	37	cost(costs, tree, probs, 2, 0);
michael@0	38	}