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| 1 /* |
| 2 * Copyright (c) 2017 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_VP9_UNCOMPRESSED_HEADER_PARSER_H_ |
| 12 #define WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP9_UNCOMPRESSED_HEADER_PARSER_H_ |
| 13 |
| 14 #include <stddef.h> |
| 15 #include <stdint.h> |
| 16 |
| 17 #include "webrtc/base/bitbuffer.h" |
| 18 #include "webrtc/base/logging.h" |
| 19 |
| 20 namespace webrtc { |
| 21 |
| 22 namespace vp9 { |
| 23 |
| 24 class VP9BitReader : public ::rtc::BitBuffer { |
| 25 public: |
| 26 VP9BitReader(const uint8_t* buffer, size_t length_) |
| 27 : BitBuffer(buffer, length_) {} |
| 28 |
| 29 uint32_t GetBit() { |
| 30 uint32_t bit = 0; |
| 31 if (ReadBits(&bit, 1)) |
| 32 return bit; |
| 33 |
| 34 LOG(LS_WARNING) << "Failed to get bit. Reached EOF."; |
| 35 return 0; |
| 36 } |
| 37 |
| 38 uint32_t GetValue(int bits) { |
| 39 uint32_t value = 0; |
| 40 if (ReadBits(&value, bits)) |
| 41 return value; |
| 42 |
| 43 LOG(LS_WARNING) << "Failed to get bit. Reached EOF."; |
| 44 return 0; |
| 45 } |
| 46 |
| 47 int32_t GetSignedValue(int bits) { |
| 48 const int32_t value = static_cast<int>(GetValue(bits)); |
| 49 return GetBit() ? -value : value; |
| 50 } |
| 51 }; |
| 52 |
| 53 // Gets the QP, QP range: [0, 255]. |
| 54 // Returns true on success, false otherwise. |
| 55 bool GetQp(const uint8_t* buf, size_t length, int* qp); |
| 56 |
| 57 } // namespace vp9 |
| 58 |
| 59 } // namespace webrtc |
| 60 |
| 61 #endif // WEBRTC_MODULES_VIDEO_CODING_UTILITY_VP9_UNCOMPRESSED_HEADER_PARSER_H_ |
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