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 MODULES_VIDEO_CODING_UTILITY_VP8_HEADER_PARSER_H_ 12 #define MODULES_VIDEO_CODING_UTILITY_VP8_HEADER_PARSER_H_ 13 14 #include <stdint.h> 15 #include <stdio.h> 16 17 namespace webrtc { 18 19 namespace vp8 { 20 21 typedef struct VP8BitReader VP8BitReader; 22 struct VP8BitReader { 23 // Boolean decoder. 24 uint32_t value_; // Current value (2 bytes). 25 uint32_t range_; // Current range (always in [128..255] interval). 26 int bits_; // Number of bits shifted out of value, at most 7. 27 // Read buffer. 28 const uint8_t* buf_; // Next byte to be read. 29 const uint8_t* buf_end_; // End of read buffer. 30 }; 31 32 // Gets the QP, QP range: [0, 127]. 33 // Returns true on success, false otherwise. 34 bool GetQp(const uint8_t* buf, size_t length, int* qp); 35 36 } // namespace vp8 37 38 } // namespace webrtc 39 40 #endif // MODULES_VIDEO_CODING_UTILITY_VP8_HEADER_PARSER_H_ 41