/* NAME senders.go DESCRIPTION See Readme.md AUTHORS Saxon A. Nelson-Milton <saxon@ausocean.org> Alan Noble <alan@ausocean.org> LICENSE revid is Copyright (C) 2017-2018 the Australian Ocean Lab (AusOcean) It is free software: you can redistribute it and/or modify them under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. It is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with revid in gpl.txt. If not, see http://www.gnu.org/licenses. */ package revid import ( "io" "os" "os/exec" "bitbucket.org/ausocean/av/rtmp" "bitbucket.org/ausocean/iot/pi/netsender" "bitbucket.org/ausocean/utils/ring" ) // loadSender is a destination to send a *ring.Chunk to. // When a loadSender has finished using the *ring.Chunk // it must be Closed. type loadSender interface { // load assigns the *ring.Chunk to the loadSender. // The load call may fail, but must not mutate the // the chunk. load(*ring.Chunk) error // send performs a destination-specific send // operation. It must not mutate the chunk. send() error // release releases the *ring.Chunk. release() // close cleans up after use of the loadSender. close() error } // restart is an optional interface for loadSenders that // can restart their connection. type restarter interface { restart() error } // fileSender implements loadSender for a local file destination. type fileSender struct { file *os.File chunk *ring.Chunk } func newFileSender(path string) (*fileSender, error) { f, err := os.Create(path) if err != nil { return nil, err } return &fileSender{file: f}, nil } func (s *fileSender) load(c *ring.Chunk) error { s.chunk = c return nil } func (s *fileSender) send() error { _, err := s.chunk.WriteTo(s.file) return err } func (s *fileSender) release() { s.chunk.Close() s.chunk = nil } func (s *fileSender) close() error { return s.file.Close() } // httpSender implements loadSender for posting HTTP to NetReceiver type httpSender struct { client *netsender.Sender log func(lvl, msg string) chunk *ring.Chunk } func newHttpSender(ns *netsender.Sender, log func(lvl, msg string)) *httpSender { return &httpSender{ client: ns, log: log, } } func (s *httpSender) load(c *ring.Chunk) error { s.chunk = c return nil } func (s *httpSender) send() error { if s.chunk == nil { // Do not retry with httpSender, // so just return without error // if the chunk has been cleared. return nil } // Only send if "V0" is configured as an input. send := false ip := s.client.Param("ip") pins := netsender.MakePins(ip, "V") for i, pin := range pins { if pin.Name == "V0" { send = true pins[i].Value = s.chunk.Len() pins[i].Data = s.chunk.Bytes() pins[i].MimeType = "video/mp2t" break } } var err error if send { _, _, err = s.client.Send(netsender.RequestPoll, pins) } // We will not retry, so release // the chunk and clear it now. s.chunk.Close() s.chunk = nil return err } func (s *httpSender) release() {} func (s *httpSender) close() error { return nil } // ffmpegSender implements loadSender for an FFMPEG RTMP destination. type ffmpegSender struct { ffmpeg io.WriteCloser chunk *ring.Chunk } func newFfmpegSender(url, framerate string) (*ffmpegSender, error) { cmd := exec.Command(ffmpegPath, "-f", "h264", "-r", framerate, "-i", "-", "-f", "lavfi", "-i", "aevalsrc=0", "-fflags", "nobuffer", "-vcodec", "copy", "-acodec", "aac", "-map", "0:0", "-map", "1:0", "-strict", "experimental", "-f", "flv", url, ) w, err := cmd.StdinPipe() if err != nil { return nil, err } err = cmd.Start() if err != nil { return nil, err } return &ffmpegSender{ffmpeg: w}, nil } func (s *ffmpegSender) load(c *ring.Chunk) error { s.chunk = c return nil } func (s *ffmpegSender) send() error { _, err := s.chunk.WriteTo(s.ffmpeg) return err } func (s *ffmpegSender) release() { s.chunk.Close() s.chunk = nil } func (s *ffmpegSender) close() error { return s.ffmpeg.Close() } // rtmpSender implements loadSender for a native RTMP destination. type rtmpSender struct { sess rtmp.Session url string timeout uint retries int log func(lvl, msg string) chunk *ring.Chunk } var _ restarter = (*rtmpSender)(nil) func newRtmpSender(url string, timeout uint, retries int, log func(lvl, msg string)) (*rtmpSender, error) { var sess rtmp.Session var err error for n := 0; n < retries; n++ { sess = rtmp.NewSession(url, timeout) err = sess.Open() if err == nil { break } log(Error, err.Error()) sess.Close() if n < retries-1 { log(Info, "retry rtmp connection") } } if err != nil { return nil, err } s := &rtmpSender{ sess: sess, url: url, timeout: timeout, retries: retries, log: log, } return s, nil } func (s *rtmpSender) load(c *ring.Chunk) error { s.chunk = c return nil } func (s *rtmpSender) send() error { _, err := s.chunk.WriteTo(s.sess) return err } func (s *rtmpSender) release() { s.chunk.Close() s.chunk = nil } func (s *rtmpSender) restart() error { err := s.sess.Close() if err != nil { return err } for n := 0; n < s.retries; n++ { s.sess = rtmp.NewSession(s.url, s.timeout) err = s.sess.Open() if err == nil { break } s.log(Error, err.Error()) s.sess.Close() if n < s.retries-1 { s.log(Info, "retry rtmp connection") } } return err } func (s *rtmpSender) close() error { return s.sess.Close() }