56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
#include "stdafx.h"
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#include "BaseSoundManager.h"
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void BaseSoundManager::ProcessLatency(uint32_t readPosition, uint32_t writePosition)
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{
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//Record latency between read & write cursors once per frame
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int32_t cursorGap;
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if (writePosition < readPosition)
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{
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cursorGap = writePosition - readPosition + _bufferSize;
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}
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else
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{
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cursorGap = writePosition - readPosition;
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}
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_cursorGaps[_cursorGapIndex] = cursorGap;
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_cursorGapIndex = (_cursorGapIndex + 1) % 60;
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if (_cursorGapIndex == 0)
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{
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_cursorGapFilled = true;
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}
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if (_cursorGapFilled)
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{
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//Once we have 60+ frames worth of data to work with, adjust playback frequency by +/- 0.5%
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//To speed up or slow down playback in order to reach our latency goal.
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uint32_t bytesPerSample = _isStereo ? 4 : 2;
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int32_t gapSum = 0;
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for (int i = 0; i < 60; i++)
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{
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gapSum += _cursorGaps[i];
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}
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int32_t gapAverage = gapSum / 60;
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_averageLatency = (gapAverage / bytesPerSample) / (double)_sampleRate * 1000;
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}
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}
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AudioStatistics BaseSoundManager::GetStatistics()
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{
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AudioStatistics stats;
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stats.AverageLatency = _averageLatency;
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stats.BufferUnderrunEventCount = _bufferUnderrunEventCount;
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stats.BufferSize = _bufferSize;
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return stats;
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}
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void BaseSoundManager::ResetStats()
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{
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_cursorGapIndex = 0;
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_cursorGapFilled = false;
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_bufferUnderrunEventCount = 0;
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_averageLatency = 0;
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}
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