The Tor Browser / file comparison
comparison: media/libvpx/vp9/common/vp9_treecoder.c
media/libvpx/vp9/common/vp9_treecoder.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:ebb4eaf0265f |
|---|---|
| 1 /* | |
| 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 | |
| 12 #include <assert.h> | |
| 13 | |
| 14 #include "./vpx_config.h" | |
| 15 #include "vp9/common/vp9_treecoder.h" | |
| 16 | |
| 17 static void tree2tok(struct vp9_token *const p, vp9_tree t, | |
| 18 int i, int v, int l) { | |
| 19 v += v; | |
| 20 ++l; | |
| 21 | |
| 22 do { | |
| 23 const vp9_tree_index j = t[i++]; | |
| 24 | |
| 25 if (j <= 0) { | |
| 26 p[-j].value = v; | |
| 27 p[-j].len = l; | |
| 28 } else { | |
| 29 tree2tok(p, t, j, v, l); | |
| 30 } | |
| 31 } while (++v & 1); | |
| 32 } | |
| 33 | |
| 34 void vp9_tokens_from_tree(struct vp9_token *p, vp9_tree t) { | |
| 35 tree2tok(p, t, 0, 0, 0); | |
| 36 } | |
| 37 | |
| 38 static unsigned int convert_distribution(unsigned int i, vp9_tree tree, | |
| 39 unsigned int branch_ct[][2], | |
| 40 const unsigned int num_events[]) { | |
| 41 unsigned int left, right; | |
| 42 | |
| 43 if (tree[i] <= 0) | |
| 44 left = num_events[-tree[i]]; | |
| 45 else | |
| 46 left = convert_distribution(tree[i], tree, branch_ct, num_events); | |
| 47 | |
| 48 if (tree[i + 1] <= 0) | |
| 49 right = num_events[-tree[i + 1]]; | |
| 50 else | |
| 51 right = convert_distribution(tree[i + 1], tree, branch_ct, num_events); | |
| 52 | |
| 53 branch_ct[i >> 1][0] = left; | |
| 54 branch_ct[i >> 1][1] = right; | |
| 55 return left + right; | |
| 56 } | |
| 57 | |
| 58 void vp9_tree_probs_from_distribution(vp9_tree tree, | |
| 59 unsigned int branch_ct[/* n-1 */][2], | |
| 60 const unsigned int num_events[/* n */]) { | |
| 61 convert_distribution(0, tree, branch_ct, num_events); | |
| 62 } | |
| 63 | |
| 64 |
