mirror of https://bitbucket.org/ausocean/av.git
88 lines
2.0 KiB
Go
88 lines
2.0 KiB
Go
/*
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NAME
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mjpeg.go
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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@ausocean.org>
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LICENSE
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mjpeg.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 http://www.gnu.org/licenses.
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*/
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package parser
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const frameStartCode = 0xD8
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type mjpegParser struct {
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inputBuffer []byte
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isParsing bool
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parserOutputChanRef chan []byte
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userOutputChanRef chan []byte
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inputChan chan byte
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delay uint
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}
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func NewMJPEGParser(inputChanLen int) (p *mjpegParser) {
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p = new(mjpegParser)
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p.isParsing = true
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p.inputChan = make(chan byte, inputChanLen)
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return
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}
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func (p *mjpegParser) Stop() {
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p.isParsing = false
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}
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func (p *mjpegParser) Start() {
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go p.parse()
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}
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func (p *mjpegParser) SetDelay(delay uint) {
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p.delay = delay
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}
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func (p *mjpegParser) InputChan() chan byte {
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return p.inputChan
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}
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func (p *mjpegParser) OutputChan() <-chan []byte {
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return p.userOutputChanRef
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}
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func (p *mjpegParser) SetOutputChan(o chan []byte) {
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p.parserOutputChanRef = o
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p.userOutputChanRef = o
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}
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func (p *mjpegParser) parse() {
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var outputBuffer []byte
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for p.isParsing {
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aByte := <-p.inputChan
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outputBuffer = append(outputBuffer, aByte)
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if aByte == 0xFF && len(outputBuffer) != 0 {
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aByte := <-p.inputChan
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outputBuffer = append(outputBuffer, aByte)
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if aByte == frameStartCode {
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p.parserOutputChanRef <- outputBuffer[:len(outputBuffer)-2]
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outputBuffer = outputBuffer[len(outputBuffer)-2:]
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}
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}
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}
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}
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