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1 /* | |
2 * Copyright (c) 2015 The WebRTC 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 #ifndef WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP8_PARSE_HEADER_H_ | |
12 #define WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP8_PARSE_HEADER_H_ | |
13 | |
14 #include <stdint.h> | |
15 #include <stdio.h> | |
16 | |
17 namespace webrtc { | |
18 | |
19 namespace vp8 { | |
20 | |
21 enum { | |
22 MB_FEATURE_TREE_PROBS = 3, | |
23 NUM_MB_SEGMENTS = 4, | |
24 NUM_REF_LF_DELTAS = 4, | |
25 NUM_MODE_LF_DELTAS = 4, | |
26 }; | |
27 | |
28 typedef struct VP8BitReader VP8BitReader; | |
29 struct VP8BitReader { | |
30 // Boolean decoder. | |
31 uint32_t value_; // Current value. | |
32 uint32_t range_; // Current range minus 1. In [127, 254] interval. | |
33 int bits_; // Number of valid bits left. | |
34 // Read buffer. | |
35 const uint8_t* buf_; // Next byte to be read. | |
36 const uint8_t* buf_end_; // End of read buffer. | |
37 int eof_; // True if input is exhausted. | |
38 }; | |
39 | |
40 const uint8_t kVP8Log2Range[128] = { | |
41 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, | |
42 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, | |
43 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, | |
44 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, | |
45 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, | |
46 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, | |
47 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, | |
48 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, | |
49 0 | |
50 }; | |
51 | |
52 // range = ((range - 1) << kVP8Log2Range[range]) + 1 | |
53 const uint8_t kVP8NewRange[128] = { | |
54 127, 127, 191, 127, 159, 191, 223, 127, | |
55 143, 159, 175, 191, 207, 223, 239, 127, | |
56 135, 143, 151, 159, 167, 175, 183, 191, | |
57 199, 207, 215, 223, 231, 239, 247, 127, | |
58 131, 135, 139, 143, 147, 151, 155, 159, | |
59 163, 167, 171, 175, 179, 183, 187, 191, | |
60 195, 199, 203, 207, 211, 215, 219, 223, | |
61 227, 231, 235, 239, 243, 247, 251, 127, | |
62 129, 131, 133, 135, 137, 139, 141, 143, | |
63 145, 147, 149, 151, 153, 155, 157, 159, | |
64 161, 163, 165, 167, 169, 171, 173, 175, | |
65 177, 179, 181, 183, 185, 187, 189, 191, | |
66 193, 195, 197, 199, 201, 203, 205, 207, | |
67 209, 211, 213, 215, 217, 219, 221, 223, | |
68 225, 227, 229, 231, 233, 235, 237, 239, | |
69 241, 243, 245, 247, 249, 251, 253, 127 | |
70 }; | |
71 | |
72 // Gets the QP, QP range: [0, 127]. | |
73 // Returns true on success, false otherwise. | |
74 bool GetQp(const uint8_t* buf, size_t length, int* qp); | |
75 | |
76 } // namespace vp8 | |
77 | |
78 } // namespace webrtc | |
79 | |
80 #endif // WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP8_PARSE_HEADER_H_ | |
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