1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 // -*- c++ -*- 19 // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 20 21 // P V M F _ T I M E S T A M P 22 23 // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 24 25 /** 26 * @file pvmf_timestamp.h 27 * @brief This file defines the PV Multimedia Framework (PVMF) timestamp class 28 * which holds a 32-bit continuous timestamp that periodically wraps back to zero. 29 * 30 */ 31 32 #ifndef PVMF_TIMESTAMP_H_INCLUDED 33 #define PVMF_TIMESTAMP_H_INCLUDED 34 35 #ifndef OSCL_BASE_H_INCLUDED 36 #include "oscl_base.h" 37 #endif 38 39 40 /** 41 * PVMFTimestamp is a circular (i.e., value wraps after max int) 42 * 32-bit timestamp container. 43 */ 44 typedef uint32 PVMFTimestamp; 45 46 const PVMFTimestamp PVMFTIMESTAMP_LESSTHAN_THRESHOLD = 0x80000000; 47 48 /** 49 * Compares two timestamps and reports if the first occurred before (is less than) 50 * the second value. 51 * @param a first timestamp value in the comparison 52 * @param b second timestamp value in the comparison 53 * @return true if a < b, false otherwise. 54 * 55 */ 56 OSCL_IMPORT_REF bool lessthan(const PVMFTimestamp& a, const PVMFTimestamp& b, 57 PVMFTimestamp threshold = PVMFTIMESTAMP_LESSTHAN_THRESHOLD); 58 59 60 typedef struct PVMFTimeValue 61 { 62 uint32 time_val; 63 uint32 time_units; 64 } _PVMFTimeValue; 65 66 #endif 67