5908c71128
Trying to submit all changes at once proved impossible since there were too many changes in too many files. The changes to PRESUBMIT.py will be uploaded in the last CL. (original CL: https://codereview.webrtc.org/1528503003/) BUG=webrtc:5309 TBR=mflodman@webrtc.org Review URL: https://codereview.webrtc.org/1540243002 Cr-Commit-Position: refs/heads/master@{#11105}
69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
/*
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* Copyright (c) 2015 The WebRTC 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 WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP8_HEADER_PARSER_H_
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#define WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP8_HEADER_PARSER_H_
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#include <stdint.h>
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#include <stdio.h>
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namespace webrtc {
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namespace vp8 {
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enum {
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MB_FEATURE_TREE_PROBS = 3,
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NUM_MB_SEGMENTS = 4,
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NUM_REF_LF_DELTAS = 4,
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NUM_MODE_LF_DELTAS = 4,
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};
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typedef struct VP8BitReader VP8BitReader;
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struct VP8BitReader {
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// Boolean decoder.
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uint32_t value_; // Current value.
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uint32_t range_; // Current range minus 1. In [127, 254] interval.
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int bits_; // Number of valid bits left.
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// Read buffer.
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const uint8_t* buf_; // Next byte to be read.
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const uint8_t* buf_end_; // End of read buffer.
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int eof_; // True if input is exhausted.
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};
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const uint8_t kVP8Log2Range[128] = {
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7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0};
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// range = ((range - 1) << kVP8Log2Range[range]) + 1
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const uint8_t kVP8NewRange[128] = {
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127, 127, 191, 127, 159, 191, 223, 127, 143, 159, 175, 191, 207, 223, 239,
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127, 135, 143, 151, 159, 167, 175, 183, 191, 199, 207, 215, 223, 231, 239,
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247, 127, 131, 135, 139, 143, 147, 151, 155, 159, 163, 167, 171, 175, 179,
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183, 187, 191, 195, 199, 203, 207, 211, 215, 219, 223, 227, 231, 235, 239,
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243, 247, 251, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149,
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151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179,
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181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209,
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211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239,
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241, 243, 245, 247, 249, 251, 253, 127};
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// Gets the QP, QP range: [0, 127].
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// Returns true on success, false otherwise.
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bool GetQp(const uint8_t* buf, size_t length, int* qp);
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} // namespace vp8
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} // namespace webrtc
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#endif // WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP8_HEADER_PARSER_H_
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