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author | hkuang <hkuang@google.com> | 2013-06-19 15:33:45 -0700 |
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committer | hkuang <hkuang@google.com> | 2013-06-20 10:24:31 -0700 |
commit | ba164dffc5a6795bce97fae02b51ccf3330e15e4 (patch) | |
tree | 9b83fdf84e5bd8bb4d47ac37a7ea9ae3eef840b6 /libvpx/vp9/encoder/vp9_treewriter.h | |
parent | ca15b5fc158a9df465aaf1acfe38d8cb5042c81b (diff) | |
download | android_external_libvpx-ba164dffc5a6795bce97fae02b51ccf3330e15e4.tar.gz android_external_libvpx-ba164dffc5a6795bce97fae02b51ccf3330e15e4.tar.bz2 android_external_libvpx-ba164dffc5a6795bce97fae02b51ccf3330e15e4.zip |
Updates libvpx to enable the VP9 decoder.
This change enables VP9 decoder for all build configurations.
Checkout is from master branch(hash:12180c8329d56d72e8d4424b8fd82b1b2f8e846a).
Change-Id: Ieaba85d0bc54e1ecdf9596398dafa03c43182f8c
Diffstat (limited to 'libvpx/vp9/encoder/vp9_treewriter.h')
-rw-r--r-- | libvpx/vp9/encoder/vp9_treewriter.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/libvpx/vp9/encoder/vp9_treewriter.h b/libvpx/vp9/encoder/vp9_treewriter.h new file mode 100644 index 0000000..eeda5cd --- /dev/null +++ b/libvpx/vp9/encoder/vp9_treewriter.h @@ -0,0 +1,87 @@ +/* + * 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_ENCODER_VP9_TREEWRITER_H_ +#define VP9_ENCODER_VP9_TREEWRITER_H_ + +/* Trees map alphabets into huffman-like codes suitable for an arithmetic + bit coder. Timothy S Murphy 11 October 2004 */ + +#include "vp9/common/vp9_treecoder.h" + +#include "vp9/encoder/vp9_boolhuff.h" /* for now */ + + +#define vp9_write_prob(w, v) vp9_write_literal((w), (v), 8) + +/* Approximate length of an encoded bool in 256ths of a bit at given prob */ + +#define vp9_cost_zero(x) (vp9_prob_cost[x]) +#define vp9_cost_one(x) vp9_cost_zero(vp9_complement(x)) + +#define vp9_cost_bit(x, b) vp9_cost_zero((b) ? vp9_complement(x) : (x)) + +/* VP8BC version is scaled by 2^20 rather than 2^8; see bool_coder.h */ + + +/* Both of these return bits, not scaled bits. */ +static INLINE unsigned int cost_branch256(const unsigned int ct[2], + vp9_prob p) { + return ct[0] * vp9_cost_zero(p) + ct[1] * vp9_cost_one(p); +} + +static INLINE unsigned int cost_branch(const unsigned int ct[2], + vp9_prob p) { + return cost_branch256(ct, p) >> 8; +} + + +static INLINE void treed_write(vp9_writer *w, + vp9_tree tree, const vp9_prob *probs, + int bits, int len) { + vp9_tree_index i = 0; + + do { + const int bit = (bits >> --len) & 1; + vp9_write(w, bit, probs[i >> 1]); + i = tree[i + bit]; + } while (len); +} + +static INLINE void write_token(vp9_writer *w, vp9_tree tree, + const vp9_prob *probs, + const struct vp9_token *token) { + treed_write(w, tree, probs, token->value, token->len); +} + +static INLINE int treed_cost(vp9_tree tree, const vp9_prob *probs, + int bits, int len) { + int cost = 0; + vp9_tree_index i = 0; + + do { + const int bit = (bits >> --len) & 1; + cost += vp9_cost_bit(probs[i >> 1], bit); + i = tree[i + bit]; + } while (len); + + return cost; +} + +static INLINE int cost_token(vp9_tree tree, const vp9_prob *probs, + const struct vp9_token *token) { + return treed_cost(tree, probs, token->value, token->len); +} + +void vp9_cost_tokens(int *costs, const vp9_prob *probs, vp9_tree tree); +void vp9_cost_tokens_skip(int *costs, const vp9_prob *probs, vp9_tree tree); + +#endif // VP9_ENCODER_VP9_TREEWRITER_H_ |