100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "timestamp_map.h"
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#include <stdlib.h>
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#include <assert.h>
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namespace webrtc {
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// Constructor. Optional parameter specifies maximum number of
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// coexisting timers.
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VCMTimestampMap::VCMTimestampMap(WebRtc_Word32 length):
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_nextAddIx(0),
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_nextPopIx(0)
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{
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if (length <= 0)
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{
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// default
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length = 10;
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}
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_map = new VCMTimestampDataTuple[length];
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_length = length;
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}
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// Destructor.
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VCMTimestampMap::~VCMTimestampMap()
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{
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delete [] _map;
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}
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// Empty the list of timers.
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void
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VCMTimestampMap::Reset()
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{
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_nextAddIx = 0;
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_nextPopIx = 0;
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}
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WebRtc_Word32
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VCMTimestampMap::Add(WebRtc_UWord32 timestamp, void* data)
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{
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_map[_nextAddIx].timestamp = timestamp;
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_map[_nextAddIx].data = data;
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_nextAddIx = (_nextAddIx + 1) % _length;
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if (_nextAddIx == _nextPopIx)
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{
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// Circular list full; forget oldest entry
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_nextPopIx = (_nextPopIx + 1) % _length;
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return -1;
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}
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return 0;
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}
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void*
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VCMTimestampMap::Pop(WebRtc_UWord32 timestamp)
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{
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while (!IsEmpty())
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{
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if (_map[_nextPopIx].timestamp == timestamp)
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{
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// found start time for this timestamp
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void* data = _map[_nextPopIx].data;
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_map[_nextPopIx].data = NULL;
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_nextPopIx = (_nextPopIx + 1) % _length;
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return data;
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}
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else if (_map[_nextPopIx].timestamp > timestamp)
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{
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// the timestamp we are looking for is not in the list
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assert(_nextPopIx < _length && _nextPopIx >= 0);
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return NULL;
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}
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// not in this position, check next (and forget this position)
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_nextPopIx = (_nextPopIx + 1) % _length;
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}
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// could not find matching timestamp in list
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assert(_nextPopIx < _length && _nextPopIx >= 0);
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return NULL;
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}
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// Check if no timers are currently running
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bool
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VCMTimestampMap::IsEmpty() const
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{
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return (_nextAddIx == _nextPopIx);
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}
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}
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