mirror of https://bitbucket.org/ausocean/av.git
73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
/*
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NAME
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BitrateCalculator.go - is a simple struct with methods to allow for easy
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calculation of bitrate.
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DESCRIPTION
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See Readme.md
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AUTHOR
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Saxon Nelson-Milton <saxon.milton@gmail.com>
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LICENSE
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BitrateCalculator.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with revid in gpl.txt. If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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package bitrate
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import (
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"fmt"
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"time"
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)
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// bitrateCalculator implements interface BitrateCalculator
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type BitrateCalculator struct {
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outputDelay int // sec
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now time.Time
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prev time.Time
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startedBefore bool
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elapsedTime time.Duration
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lastDisplayTime time.Time
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}
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// Place this at the start of the code segment that you would like to time
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func (bc *BitrateCalculator) Start(outputDelay int) {
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if outputDelay >= 0 {
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bc.outputDelay = outputDelay
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} else {
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bc.outputDelay = 0
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}
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bc.prev = time.Now()
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if !bc.startedBefore {
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bc.startedBefore = true
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bc.elapsedTime = time.Duration(0)
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bc.lastDisplayTime = time.Now()
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}
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}
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// Place this at the end of the code segment that you would like to time
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func (bc *BitrateCalculator) Stop(noOfKB float64) (bitrate int64) {
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bc.now = time.Now()
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deltaTime := bc.now.Sub(bc.prev)
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if bc.now.Sub(bc.lastDisplayTime) > time.Duration(bc.outputDelay)*time.Second {
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bitrate = int64(noOfKB / float64(deltaTime/1e9))
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fmt.Printf("Bitrate: %d kbps\n", bitrate)
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bc.elapsedTime = time.Duration(0)
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bc.lastDisplayTime = bc.now
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}
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return
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}
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