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| /*
| * Copyright (c) 2015 The WebRTC 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 WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP8_HEADER_PARSER_H_
| #define WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP8_HEADER_PARSER_H_
|
| #include <stdint.h>
| #include <stdio.h>
|
| namespace webrtc {
|
| namespace vp8 {
|
| enum {
| MB_FEATURE_TREE_PROBS = 3,
| NUM_MB_SEGMENTS = 4,
| NUM_REF_LF_DELTAS = 4,
| NUM_MODE_LF_DELTAS = 4,
| };
|
| typedef struct VP8BitReader VP8BitReader;
| struct VP8BitReader {
| // Boolean decoder.
| uint32_t value_; // Current value.
| uint32_t range_; // Current range minus 1. In [127, 254] interval.
| int bits_; // Number of valid bits left.
| // Read buffer.
| const uint8_t* buf_; // Next byte to be read.
| const uint8_t* buf_end_; // End of read buffer.
| int eof_; // True if input is exhausted.
| };
|
| const uint8_t kVP8Log2Range[128] = {
| 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3,
| 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
| 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1,
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0};
|
| // range = ((range - 1) << kVP8Log2Range[range]) + 1
| const uint8_t kVP8NewRange[128] = {
| 127, 127, 191, 127, 159, 191, 223, 127, 143, 159, 175, 191, 207, 223, 239,
| 127, 135, 143, 151, 159, 167, 175, 183, 191, 199, 207, 215, 223, 231, 239,
| 247, 127, 131, 135, 139, 143, 147, 151, 155, 159, 163, 167, 171, 175, 179,
| 183, 187, 191, 195, 199, 203, 207, 211, 215, 219, 223, 227, 231, 235, 239,
| 243, 247, 251, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149,
| 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179,
| 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209,
| 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239,
| 241, 243, 245, 247, 249, 251, 253, 127};
|
| // Gets the QP, QP range: [0, 127].
| // Returns true on success, false otherwise.
| bool GetQp(const uint8_t* buf, size_t length, int* qp);
|
| } // namespace vp8
|
| } // namespace webrtc
|
| #endif // WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP8_HEADER_PARSER_H_
|
|
