Switch to config file

config.go

@@ -1,24 +1,31 @@
 package main
 
 type Config struct {
+	// Bind address
+	Bind string `json:"bind"`
+
 	// FFmpeg binary
-	ffmpeg string
+	FFmpeg string `json:"ffmpeg"`
 	// FFprobe binary
-	ffprobe string
+	FFprobe string `json:"ffprobe"`
 	// Temp files directory
-	tempdir string
+	TempDir string `json:"tempdir"`
 
 	// Size of each chunk in seconds
-	chunkSize int
+	ChunkSize int `json:"chunkSize"`
 	// How many *chunks* to look behind before restarting transcoding
-	lookBehind int
+	LookBehind int `json:"lookBehind"`
 	// Number of chunks in goal to restart encoding
-	goalBufferMin int
+	GoalBufferMin int `json:"goalBufferMin"`
 	// Number of chunks in goal to stop encoding
-	goalBufferMax int
+	GoalBufferMax int `json:"goalBufferMax"`
 
 	// Number of seconds to wait before shutting down encoding
-	streamIdleTime int
+	StreamIdleTime int `json:"streamIdleTime"`
 	// Number of seconds to wait before shutting down a client
-	managerIdleTime int
+	ManagerIdleTime int `json:"managerIdleTime"`
+
+	// Hardware acceleration configuration
+	VAAPI bool `json:"vaapi"`
+	NVENC bool `json:"nvenc"`
 }

main.go

@@ -1,7 +1,9 @@
 package main
 
 import (
+	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
@@ -24,8 +26,8 @@ func NewHandler(c *Config) *Handler {
 	}
 
 	// Recreate tempdir
-	os.RemoveAll(c.tempdir)
+	os.RemoveAll(c.TempDir)
-	os.MkdirAll(c.tempdir, 0755)
+	os.MkdirAll(c.TempDir, 0755)
 
 	go h.watchClose()
 	return h
@@ -120,51 +122,54 @@ func (h *Handler) Close() {
 	h.close <- ""
 }
 
+func loadConfig(path string, c *Config) {
+	// load json config
+	content, err := ioutil.ReadFile(path)
+	if err != nil {
+		log.Fatal("Error when opening file: ", err)
+	}
+
+	err = json.Unmarshal(content, &c)
+	if err != nil {
+		log.Fatal("Error loading config file", err)
+	}
+
+	// Print loaded config
+	fmt.Printf("%+v\n", c)
+}
+
 func main() {
 	if len(os.Args) >= 2 && os.Args[1] == "test" {
 		fmt.Println("test successful")
 		return
 	}
 
+	c := &Config{
+		Bind:            ":47788",
+		ChunkSize:       3,
+		LookBehind:      5,
+		GoalBufferMin:   1,
+		GoalBufferMax:   4,
+		StreamIdleTime:  60,
+		ManagerIdleTime: 60,
+	}
+
+	// Load config file from second argument
+	if len(os.Args) >= 2 {
+		loadConfig(os.Args[1], c)
+	} else {
+		log.Fatal("Missing config file")
+	}
+
+	if c.FFmpeg == "" || c.FFprobe == "" || c.TempDir == "" {
+		log.Fatal("Missing critical param -- check config file")
+	}
+
 	log.Println("Starting VOD server")
 
-	// get executable paths
+	h := NewHandler(c)
-	ffmpeg := os.Getenv("FFMPEG")
-	if ffmpeg == "" {
-		ffmpeg = "ffmpeg"
-	}
-
-	ffprobe := os.Getenv("FFPROBE")
-	if ffprobe == "" {
-		ffprobe = "ffprobe"
-	}
-
-	// get tempdir
-	tempdir := os.Getenv("GOVOD_TEMPDIR")
-	if tempdir == "" {
-		tempdir = "/tmp/go-vod"
-	}
-
-	// get port
-	bind := os.Getenv("GOVOD_BIND")
-	if bind == "" {
-		bind = ":47788"
-	}
-
-	h := NewHandler(&Config{
-		ffmpeg:          ffmpeg,
-		ffprobe:         ffprobe,
-		tempdir:         tempdir,
-		chunkSize:       3,
-		lookBehind:      5,
-		goalBufferMin:   1,
-		goalBufferMax:   4,
-		streamIdleTime:  60,
-		managerIdleTime: 60,
-	})
-
 	http.Handle("/", h)
-	http.ListenAndServe(bind, nil)
+	http.ListenAndServe(c.Bind, nil)
 
 	log.Println("Exiting VOD server")
 	h.Close()

manager.go

@@ -49,7 +49,7 @@ func NewManager(c *Config, path string, id string, close chan string) (*Manager,
 	h := fnv.New32a()
 	h.Write([]byte(path))
 	ph := fmt.Sprint(h.Sum32())
-	m.tempDir = fmt.Sprintf("%s/%s-%s", m.c.tempdir, id, ph)
+	m.tempDir = fmt.Sprintf("%s/%s-%s", m.c.TempDir, id, ph)
 
 	// Delete temp dir if exists
 	os.RemoveAll(m.tempDir)
@@ -64,7 +64,7 @@ func NewManager(c *Config, path string, id string, close chan string) (*Manager,
 		m.probe.BitRate *= 2
 	}
 
-	m.numChunks = int(math.Ceil(m.probe.Duration.Seconds() / float64(c.chunkSize)))
+	m.numChunks = int(math.Ceil(m.probe.Duration.Seconds() / float64(c.ChunkSize)))
 
 	// Possible streams
 	m.streams["360p"] = &Stream{c: c, m: m, quality: "360p", height: 360, width: 640, bitrate: 500000}
@@ -134,7 +134,7 @@ func NewManager(c *Config, path string, id string, close chan string) (*Manager,
 			}
 
 			// Nothing done for 5 minutes
-			if m.inactive >= m.c.managerIdleTime/5 {
+			if m.inactive >= m.c.ManagerIdleTime/5 {
 				t.Stop()
 				m.Destroy()
 				m.close <- m.id
@@ -247,7 +247,7 @@ func (m *Manager) ffprobe() error {
 	}
 
 	ctx, _ := context.WithDeadline(context.TODO(), time.Now().Add(5*time.Second))
-	cmd := exec.CommandContext(ctx, m.c.ffprobe, args...)
+	cmd := exec.CommandContext(ctx, m.c.FFprobe, args...)
 
 	var stdout, stderr bytes.Buffer
 	cmd.Stdout = &stdout

stream.go

@@ -63,7 +63,7 @@ func (s *Stream) Run() {
 			s.mutex.Lock()
 			// Prune chunks
 			for id := range s.chunks {
-				if id < s.goal-s.c.goalBufferMax {
+				if id < s.goal-s.c.GoalBufferMax {
 					s.pruneChunk(id)
 				}
 			}
@@ -71,7 +71,7 @@ func (s *Stream) Run() {
 			s.inactive++
 
 			// Nothing done for 2 minutes
-			if s.inactive >= s.c.streamIdleTime/5 && s.coder != nil {
+			if s.inactive >= s.c.StreamIdleTime/5 && s.coder != nil {
 				t.Stop()
 				s.clear()
 			}
@@ -119,14 +119,14 @@ func (s *Stream) ServeList(w http.ResponseWriter, r *http.Request) error {
 	w.Write([]byte("#EXT-X-VERSION:4\n"))
 	w.Write([]byte("#EXT-X-MEDIA-SEQUENCE:0\n"))
 	w.Write([]byte("#EXT-X-PLAYLIST-TYPE:VOD\n"))
-	w.Write([]byte(fmt.Sprintf("#EXT-X-TARGETDURATION:%d\n", s.c.chunkSize)))
+	w.Write([]byte(fmt.Sprintf("#EXT-X-TARGETDURATION:%d\n", s.c.ChunkSize)))
 
 	query := GetQueryString(r)
 
 	duration := s.m.probe.Duration.Seconds()
 	i := 0
 	for duration > 0 {
-		size := float64(s.c.chunkSize)
+		size := float64(s.c.ChunkSize)
 		if duration < size {
 			size = duration
 		}
@@ -134,7 +134,7 @@ func (s *Stream) ServeList(w http.ResponseWriter, r *http.Request) error {
 		w.Write([]byte(fmt.Sprintf("#EXTINF:%.3f, nodesc\n", size)))
 		w.Write([]byte(fmt.Sprintf("%s-%06d.ts%s\n", s.quality, i, query)))
 
-		duration -= float64(s.c.chunkSize)
+		duration -= float64(s.c.ChunkSize)
 		i++
 	}
 
@@ -165,7 +165,7 @@ func (s *Stream) ServeChunk(w http.ResponseWriter, id int) error {
 
 	// Will have this soon enough
 	foundBehind := false
-	for i := id - 1; i > id-s.c.lookBehind && i >= 0; i-- {
+	for i := id - 1; i > id-s.c.LookBehind && i >= 0; i-- {
 		if _, ok := s.chunks[i]; ok {
 			foundBehind = true
 		}
@@ -201,7 +201,7 @@ func (s *Stream) ServeFullVideo(w http.ResponseWriter, r *http.Request) error {
 		"-movflags", "frag_keyframe+empty_moov+faststart", "-f", "mov", "pipe:1",
 	}...)
 
-	coder := exec.Command(s.c.ffmpeg, args...)
+	coder := exec.Command(s.c.FFmpeg, args...)
 	log.Printf("%s-%s: %s", s.m.id, s.quality, strings.Join(coder.Args[:], " "))
 
 	cmdStdOut, err := coder.StdoutPipe()
@@ -350,7 +350,7 @@ func (s *Stream) restartAtChunk(w http.ResponseWriter, id int) {
 	chunk := s.createChunk(id) // create first chunk
 
 	// Start the transcoder
-	s.goal = id + s.c.goalBufferMax
+	s.goal = id + s.c.GoalBufferMax
 	s.transcode(id)
 
 	s.waitForChunk(w, chunk) // this is also a request
@@ -372,11 +372,11 @@ func (s *Stream) transcodeArgs(startAt float64) []string {
 	CV := "libx264"
 
 	// Check whether hwaccel should be used
-	if os.Getenv("VAAPI") == "1" {
+	if s.c.VAAPI {
 		CV = "h264_vaapi"
 		extra := "-hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi"
 		args = append(args, strings.Split(extra, " ")...)
-	} else if os.Getenv("NVENC") == "1" {
+	} else if s.c.NVENC {
 		CV = "h264_nvenc"
 		extra := "-hwaccel cuda -hwaccel_output_format cuda"
 		args = append(args, strings.Split(extra, " ")...)
@@ -481,7 +481,7 @@ func (s *Stream) transcode(startId int) {
 		// This ensures that the keyframes are aligned
 		startId--
 	}
-	startAt := float64(startId * s.c.chunkSize)
+	startAt := float64(startId * s.c.ChunkSize)
 
 	args := s.transcodeArgs(startAt)
 
@@ -489,15 +489,15 @@ func (s *Stream) transcode(startId int) {
 	args = append(args, []string{
 		"-avoid_negative_ts", "disabled",
 		"-f", "hls",
-		"-hls_time", fmt.Sprintf("%d", s.c.chunkSize),
+		"-hls_time", fmt.Sprintf("%d", s.c.ChunkSize),
-		"-force_key_frames", fmt.Sprintf("expr:gte(t,n_forced*%d)", s.c.chunkSize),
+		"-force_key_frames", fmt.Sprintf("expr:gte(t,n_forced*%d)", s.c.ChunkSize),
 		"-hls_segment_type", "mpegts",
 		"-start_number", fmt.Sprintf("%d", startId),
 		"-hls_segment_filename", s.getTsPath(-1),
 		"-",
 	}...)
 
-	s.coder = exec.Command(s.c.ffmpeg, args...)
+	s.coder = exec.Command(s.c.FFmpeg, args...)
 	log.Printf("%s-%s: %s", s.m.id, s.quality, strings.Join(s.coder.Args[:], " "))
 
 	cmdStdOut, err := s.coder.StdoutPipe()
@@ -520,9 +520,9 @@ func (s *Stream) transcode(startId int) {
 }
 
 func (s *Stream) checkGoal(id int) {
-	goal := id + s.c.goalBufferMin
+	goal := id + s.c.GoalBufferMin
 	if goal > s.goal {
-		s.goal = id + s.c.goalBufferMax
+		s.goal = id + s.c.GoalBufferMax
 
 		// resume encoding
 		if s.coder != nil {