b7ce96470b
This makes it clearer this code not meant to be used as an API. I could not find any use of this in downstream code. BUG=webrtc:5095 TESTED=git cl try -c --bot=android_compile_rel --bot=linux_compile_rel --bot=win_compile_rel --bot=mac_compile_rel --bot=ios_rel --bot=linux_gn_rel --bot=win_x64_gn_rel --bot=mac_x64_gn_rel --bot=android_gn_rel -m tryserver.webrtc R=stefan@webrtc.org TBR=magjed@webrtc.org Review URL: https://codereview.webrtc.org/1440873005 . Cr-Commit-Position: refs/heads/master@{#10699}
81 lines
2.6 KiB
C++
81 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,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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2, 2, 2, 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,
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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,
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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,
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0
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};
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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,
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143, 159, 175, 191, 207, 223, 239, 127,
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135, 143, 151, 159, 167, 175, 183, 191,
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199, 207, 215, 223, 231, 239, 247, 127,
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131, 135, 139, 143, 147, 151, 155, 159,
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163, 167, 171, 175, 179, 183, 187, 191,
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195, 199, 203, 207, 211, 215, 219, 223,
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227, 231, 235, 239, 243, 247, 251, 127,
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129, 131, 133, 135, 137, 139, 141, 143,
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145, 147, 149, 151, 153, 155, 157, 159,
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161, 163, 165, 167, 169, 171, 173, 175,
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177, 179, 181, 183, 185, 187, 189, 191,
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193, 195, 197, 199, 201, 203, 205, 207,
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209, 211, 213, 215, 217, 219, 221, 223,
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225, 227, 229, 231, 233, 235, 237, 239,
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241, 243, 245, 247, 249, 251, 253, 127
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};
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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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