mirror of
https://github.com/Luzifer/cam2mjpeg.git
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Initial version
This commit is contained in:
commit
9eff140ae9
GPG Key ID:
DC2729FDD34BE99E
1
.gitignore
vendored
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1
.gitignore
vendored
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cam2mjpeg
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7
go.mod
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7
go.mod
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module github.com/Luzifer/cam2mjpeg
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require (
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github.com/Luzifer/rconfig/v2 v2.2.1
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github.com/gofrs/uuid v3.2.0+incompatible
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github.com/sirupsen/logrus v1.3.0
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)
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22
go.sum
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22
go.sum
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github.com/Luzifer/rconfig/v2 v2.2.1 h1:zcDdLQlnlzwcBJ8E0WFzOkQE1pCMn3EbX0dFYkeTczg=
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github.com/Luzifer/rconfig/v2 v2.2.1/go.mod h1:OKIX0/JRZrPJ/ZXXWklQEFXA6tBfWaljZbW37w+sqBw=
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github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/gofrs/uuid v3.2.0+incompatible h1:y12jRkkFxsd7GpqdSZ+/KCs/fJbqpEXSGd4+jfEaewE=
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github.com/gofrs/uuid v3.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
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github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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github.com/sirupsen/logrus v1.3.0 h1:hI/7Q+DtNZ2kINb6qt/lS+IyXnHQe9e90POfeewL/ME=
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github.com/sirupsen/logrus v1.3.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
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github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
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github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
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github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
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golang.org/x/crypto v0.0.0-20180904163835-0709b304e793 h1:u+LnwYTOOW7Ukr/fppxEb1Nwz0AtPflrblfvUudpo+I=
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golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33 h1:I6FyU15t786LL7oL/hn43zqTuEGr4PN7F4XJ1p4E3Y8=
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golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19 h1:WB265cn5OpO+hK3pikC9hpP1zI/KTwmyMFKloW9eOVc=
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gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19/go.mod h1:o4V0GXN9/CAmCsvJ0oXYZvrZOe7syiDZSN1GWGZTGzc=
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gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
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gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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163
main.go
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163
main.go
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package main
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import (
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"bytes"
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"fmt"
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"io"
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"net/http"
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"os"
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"os/exec"
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"strconv"
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"sync"
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rconfig "github.com/Luzifer/rconfig/v2"
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"github.com/gofrs/uuid"
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log "github.com/sirupsen/logrus"
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)
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var (
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cfg = struct {
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Device string `flag:"input,i" default:"/dev/video0" description:"Video device to read from"`
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FrameRate int `flag:"rate,r" default:"10" description:"Frame rate to show in MJPEG"`
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Height int `flag:"height,h" default:"720" description:"Height of video frames"`
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Listen string `flag:"listen" default:":3000" description:"Port/IP to listen on"`
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LogLevel string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
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Quality int `flag:"quality,q" default:"5" description:"Image quality (2..31)"`
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VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"`
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Width int `flag:"width,w" default:"1280" description:"Width of video frames"`
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}{}
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requester = map[string]chan []byte{}
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requesterLock = new(sync.RWMutex)
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version = "dev"
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)
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var (
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beginOfJPEG = []byte{0xff, 0xd8}
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endOfJPEG = []byte{0xff, 0xd9}
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)
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const maxBacklog = 5
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func init() {
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if err := rconfig.ParseAndValidate(&cfg); err != nil {
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log.Fatalf("Unable to parse commandline options: %s", err)
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}
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if cfg.VersionAndExit {
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fmt.Printf("imgdecode %s\n", version)
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os.Exit(0)
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}
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if l, err := log.ParseLevel(cfg.LogLevel); err != nil {
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log.WithError(err).Fatal("Unable to parse log level")
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} else {
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log.SetLevel(l)
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}
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}
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func main() {
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http.HandleFunc("/mjpeg", handle)
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go func() {
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log.WithError(http.ListenAndServe(cfg.Listen, nil)).Fatal("HTTP server has gone")
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}()
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log.Debug("HTTP server spawned")
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cmd := exec.Command("ffmpeg",
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"-f", "video4linux2",
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"-input_format", "yuyv422",
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"-s", fmt.Sprintf("%dx%d", cfg.Width, cfg.Height),
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"-r", strconv.Itoa(cfg.FrameRate),
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"-i", cfg.Device,
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"-c:v", "mjpeg",
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"-q:v", strconv.Itoa(cfg.Quality),
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"-boundary_tag", "ffmpeg",
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"-f", "image2pipe",
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"-")
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cmd.Stderr = os.Stderr
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out, err := cmd.StdoutPipe()
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if err != nil {
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log.WithError(err).Fatal("Unable to create stdout pipe")
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}
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if err := cmd.Start(); err != nil {
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log.WithError(err).Fatal("Unable to spawn ffmpeg")
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}
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defer cmd.Process.Kill()
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log.Debug("ffmpeg spawned")
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buf := new(bytes.Buffer)
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for {
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if _, err := io.CopyN(buf, out, 1024); err != nil {
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log.WithError(err).Error("Failed to read ffmpeg output")
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break
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}
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eoj := bytes.Index(buf.Bytes(), endOfJPEG)
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if eoj == -1 {
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continue
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}
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img := buf.Next(eoj + len(endOfJPEG))
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if !bytes.HasPrefix(img, beginOfJPEG) || !bytes.HasSuffix(img, endOfJPEG) {
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log.Warn("Found invalid JPEG, skipping")
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continue
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}
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go sendImage(img)
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}
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}
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func sendImage(jpg []byte) {
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requesterLock.RLock()
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defer requesterLock.RUnlock()
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if len(requester) == 0 {
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return
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}
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for _, c := range requester {
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if len(c) < maxBacklog {
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c <- jpg
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}
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}
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log.WithField("requesters", len(requester)).Debug("sent frame")
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}
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func handle(res http.ResponseWriter, r *http.Request) {
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imgChan := make(chan []byte, 10)
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uid := uuid.Must(uuid.NewV4()).String()
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defer func() {
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deregisterImgChan(uid)
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close(imgChan)
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}()
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registerImgChan(uid, imgChan)
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handleMJPEG(res, r, imgChan, uid)
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}
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func registerImgChan(id string, ic chan []byte) {
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requesterLock.Lock()
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defer requesterLock.Unlock()
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requester[id] = ic
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log.WithField("id", id).Debug("registered new requester")
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}
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func deregisterImgChan(id string) {
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requesterLock.Lock()
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defer requesterLock.Unlock()
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delete(requester, id)
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log.WithField("id", id).Debug("removed requester")
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}
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61
mjpeg.go
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61
mjpeg.go
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package main
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import (
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"fmt"
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"mime/multipart"
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"net/http"
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"net/textproto"
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log "github.com/sirupsen/logrus"
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)
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func handleMJPEG(res http.ResponseWriter, r *http.Request, imgs chan []byte, uid string) {
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if r.Method != "GET" {
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http.Error(res, "405 Method Not Allowed", http.StatusMethodNotAllowed)
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return
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}
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logger := log.WithField("id", uid)
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mimeWriter := multipart.NewWriter(res)
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mimeWriter.SetBoundary("--boundary")
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defer mimeWriter.Close()
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res.Header().Add("Connection", "close")
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res.Header().Add("Cache-Control", "no-store, no-cache")
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res.Header().Add("Content-Type", fmt.Sprintf("multipart/x-mixed-replace;boundary=%s", mimeWriter.Boundary()))
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cn := res.(http.CloseNotifier).CloseNotify()
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errC := 0
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for {
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select {
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case <-cn:
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return
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case img := <-imgs:
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partHeader := make(textproto.MIMEHeader)
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partHeader.Add("Content-Type", "image/jpeg")
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partWriter, err := mimeWriter.CreatePart(partHeader)
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if err != nil {
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logger.WithError(err).Error("Unable to create mime part")
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continue
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}
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_, err = partWriter.Write(img)
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if err != nil {
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logger.WithError(err).Error("Unable to write image")
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errC++
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if errC > 5 {
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logger.Error("Too many errors, killing connection")
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return
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}
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continue
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}
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errC = 0
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}
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}
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}
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