2018-02-13 11:39:26 +03:00
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/*
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NAME
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RtpToTsConverter.go - provides utilities for the conversion of Rtp packets
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to equivalent MpegTs packets.
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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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RtpToTsConverter.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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2018-02-10 16:25:55 +03:00
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package generator
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2018-02-10 09:59:56 +03:00
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2018-02-12 10:58:29 +03:00
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import (
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"../flv"
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2018-02-15 10:02:04 +03:00
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_"fmt"
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"time"
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2018-02-12 10:58:29 +03:00
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)
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const (
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inputChanLength = 1000
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outputChanLength = 1000
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)
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2018-02-10 16:25:55 +03:00
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type flvGenerator struct {
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fps uint
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inputChan chan []byte
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outputChan chan []byte
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2018-02-12 10:58:29 +03:00
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audioFlag bool
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videoFlag bool
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lastTagSize int
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currentTimestamp uint32
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header flv.Header
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2018-02-10 16:25:55 +03:00
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}
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func (g *flvGenerator)GetInputChan() chan []byte {
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return g.inputChan
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}
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func (g *flvGenerator)GetOutputChan() chan []byte {
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return g.outputChan
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}
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2018-02-12 10:58:29 +03:00
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func NewFlvGenerator(audio bool, video bool, fps uint) (g *flvGenerator) {
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2018-02-10 16:25:55 +03:00
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g = new(flvGenerator)
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2018-02-12 10:58:29 +03:00
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g.fps = fps
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g.audioFlag = audio
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g.videoFlag = video
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g.currentTimestamp = 0
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2018-02-11 09:06:59 +03:00
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g.lastTagSize = 0
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2018-02-12 10:58:29 +03:00
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g.inputChan = make(chan []byte, inputChanLength)
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g.outputChan = make(chan []byte, outputChanLength)
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2018-02-10 16:25:55 +03:00
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return
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}
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func (g *flvGenerator) Start(){
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go g.generate()
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}
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func (g *flvGenerator) GenHeader(){
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2018-02-11 09:06:59 +03:00
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header := flv.Header{
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AudioFlag: g.audioFlag,
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VideoFlag: g.videoFlag,
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2018-02-10 16:25:55 +03:00
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}
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2018-02-12 10:58:29 +03:00
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g.outputChan <- header.ToByteSlice()
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2018-02-10 16:25:55 +03:00
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}
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2018-02-11 09:06:59 +03:00
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func (g *flvGenerator) getNextTimestamp() (timestamp uint32){
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timestamp = g.currentTimestamp
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2018-02-12 10:58:29 +03:00
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g.currentTimestamp += uint32(1000) / uint32(g.fps)
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2018-02-10 16:25:55 +03:00
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return
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}
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func (g *flvGenerator) ResetTimestamp() {
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g.currentTimestamp = 0
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2018-02-10 16:25:55 +03:00
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}
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2018-02-12 10:58:29 +03:00
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func (g *flvGenerator) generate() {
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g.GenHeader()
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for {
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select {
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case videoFrame := <-g.inputChan:
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timeStamp := g.getNextTimestamp()
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videoTag := flv.VideoTag{
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PrevTagSize: uint32(g.lastTagSize),
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TagType: uint8(flv.VideoTagType),
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DataSize: uint32(len(videoFrame)) + flv.DataHeaderLength,
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2018-02-15 10:02:04 +03:00
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Timestamp: timeStamp,
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2018-02-12 16:31:19 +03:00
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TimestampExtended: flv.NoTimestampExtension,
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2018-02-12 10:58:29 +03:00
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FrameType: flv.KeyFrameType,
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Codec: flv.H264,
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PacketType: flv.AVCNALU,
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CompositionTime: 0,
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Data: videoFrame,
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2018-02-11 09:06:59 +03:00
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}
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2018-02-15 10:02:04 +03:00
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videoTagAsByteSlice := videoTag.ToByteSlice()
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g.lastTagSize = len(videoTagAsByteSlice)
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g.outputChan<-videoTagAsByteSlice
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soundData := make([]byte, 10)
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for i := range soundData {
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if i == 0 {
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soundData[i] = 1
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} else {
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soundData[i] = 0
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}
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}
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audioTag := flv.AudioTag{
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PrevTagSize: uint32(g.lastTagSize),
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TagType: uint8(flv.AudioTagType),
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DataSize: 1 + 10,
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Timestamp: timeStamp,
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TimestampExtended: flv.NoTimestampExtension,
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SoundFormat: flv.AACAudioFormat,
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SoundRate: 0,
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SoundSize: false,
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SoundType: false,
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Data: soundData,
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}
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audioTagAsByteSlice := audioTag.ToByteSlice()
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g.lastTagSize = len(audioTagAsByteSlice)
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g.outputChan<-audioTagAsByteSlice
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time.Sleep(40*time.Millisecond)
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2018-02-10 16:25:55 +03:00
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}
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}
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2018-02-10 09:59:56 +03:00
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}
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