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package streamer
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import (
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"bufio"
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"context"
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"errors"
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"fmt"
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"io"
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"live-streamer/config"
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"live-streamer/logger"
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"os/exec"
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"strings"
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"sync"
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"time"
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)
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type Streamer struct {
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videoList []config.InputItem
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currentVideoIndex int
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cmd *exec.Cmd
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ctx context.Context
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cancel context.CancelFunc
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mu sync.Mutex
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logger logger.Logger
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}
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var GlobalStreamer *Streamer
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func NewStreamer(videoList []config.InputItem, logger logger.Logger) *Streamer {
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GlobalStreamer = &Streamer{
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videoList: videoList,
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currentVideoIndex: 0,
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cmd: nil,
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ctx: nil,
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logger: logger,
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}
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return GlobalStreamer
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}
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func (s *Streamer) Stream() {
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for {
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if len(s.videoList) == 0 {
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time.Sleep(time.Second)
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continue
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}
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s.start()
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}
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}
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func (s *Streamer) start() {
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s.Stop()
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s.ctx, s.cancel = context.WithCancel(context.Background())
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currentVideo := s.videoList[s.currentVideoIndex]
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videoPath := currentVideo.Path
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s.logger.Println("start stream: ", videoPath)
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s.mu.Lock()
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s.cmd = exec.CommandContext(s.ctx, "ffmpeg", s.buildFFmpegArgs(currentVideo)...)
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s.mu.Unlock()
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pipe, err := s.cmd.StderrPipe()
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if err != nil {
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s.logger.Printf("failed to get pipe: %v", err)
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return
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}
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reader := bufio.NewReader(pipe)
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if err := s.cmd.Start(); err != nil {
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s.logger.Printf("starting ffmpeg error: %v\n", err)
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return
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}
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go s.log(reader)
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<-s.ctx.Done()
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s.logger.Printf("stop stream: %s", videoPath)
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// stream next video
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s.currentVideoIndex++
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if s.currentVideoIndex >= len(s.videoList) {
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s.currentVideoIndex = 0
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}
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}
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func (s *Streamer) Stop() {
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if s.cancel != nil {
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stopped := make(chan error)
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go func() {
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stopped <- s.cmd.Wait()
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}()
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s.cancel()
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s.mu.Lock()
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if s.cmd != nil && s.cmd.Process != nil {
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select {
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case <-stopped:
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break
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case <-time.After(3 * time.Second):
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_ = s.cmd.Process.Kill()
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break
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}
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s.cmd = nil
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}
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s.mu.Unlock()
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}
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}
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func (s *Streamer) Add(videoPath string) {
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s.videoList = append(s.videoList, config.InputItem{Path: videoPath})
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}
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func (s *Streamer) Remove(videoPath string) {
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for i, item := range s.videoList {
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if item.Path == videoPath {
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s.videoList = append(s.videoList[:i], s.videoList[i+1:]...)
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if s.currentVideoIndex >= len(s.videoList) {
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s.currentVideoIndex = 0
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}
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if s.currentVideoIndex == i {
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s.Stop()
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}
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break
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}
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}
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}
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func (s *Streamer) Prev() {
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s.currentVideoIndex--
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if s.currentVideoIndex < 0 {
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s.currentVideoIndex = len(s.videoList) - 1
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}
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s.Stop()
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}
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func (s *Streamer) Next() {
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s.currentVideoIndex++
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if s.currentVideoIndex >= len(s.videoList) {
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s.currentVideoIndex = 0
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}
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s.Stop()
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}
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func (s *Streamer) log(reader *bufio.Reader) {
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select {
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case <-s.ctx.Done():
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return
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default:
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if !config.GlobalConfig.Log.PlayState {
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return
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}
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buf := make([]byte, 1024)
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for {
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n, err := reader.Read(buf)
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if n > 0 {
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videoPath, _ := s.GetCurrentVideoPath()
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buf = append([]byte(videoPath), buf...)
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s.logger.Print(string(buf[:n]))
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}
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if err != nil {
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if err != io.EOF {
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s.logger.Printf("reading ffmpeg error: %v\n", err)
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}
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break
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}
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}
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}
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}
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func (s *Streamer) buildFFmpegArgs(videoItem config.InputItem) []string {
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videoPath := videoItem.Path
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args := []string{"-re"}
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if videoItem.Start != "" {
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args = append(args, "-ss", videoItem.Start)
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}
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args = append(args, "-i", videoPath)
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if videoItem.End != "" {
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args = append(args, "-to", videoItem.End)
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}
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args = append(args,
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"-c:v", config.GlobalConfig.Play.VideoCodec,
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"-preset", config.GlobalConfig.Play.Preset,
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"-crf", fmt.Sprintf("%d", config.GlobalConfig.Play.CRF),
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"-maxrate", config.GlobalConfig.Play.MaxRate,
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"-bufsize", config.GlobalConfig.Play.BufSize,
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"-vf", fmt.Sprintf("scale=%s", config.GlobalConfig.Play.Scale),
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"-r", fmt.Sprintf("%d", config.GlobalConfig.Play.FrameRate),
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"-c:a", config.GlobalConfig.Play.AudioCodec,
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"-b:a", config.GlobalConfig.Play.AudioBitrate,
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"-ar", fmt.Sprintf("%d", config.GlobalConfig.Play.AudioSampleRate),
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"-f", config.GlobalConfig.Play.OutputFormat,
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"-stats", "-loglevel", "info",
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)
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if config.GlobalConfig.Play.CustomArgs != "" {
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customArgs := strings.Fields(config.GlobalConfig.Play.CustomArgs)
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args = append(args, customArgs...)
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}
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args = append(args, fmt.Sprintf("%s/%s", config.GlobalConfig.Output.RTMPServer, config.GlobalConfig.Output.StreamKey))
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// logger.GlobalLogger.Println("ffmpeg args: ", args)
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return args
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}
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func (s *Streamer) GetCurrentVideoPath() (string, error) {
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if len(s.videoList) == 0 {
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return "", errors.New("no video streaming")
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}
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return s.videoList[s.currentVideoIndex].Path, nil
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}
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func (s *Streamer) GetVideoList() []config.InputItem {
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return s.videoList
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}
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func (s *Streamer) GetVideoListPath() []string {
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var videoList []string
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for _, item := range s.videoList {
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videoList = append(videoList, item.Path)
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}
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return videoList
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}
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func (s *Streamer) GetCurrentIndex() int {
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return s.currentVideoIndex
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}
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func (s *Streamer) Close() {
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s.Stop()
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}
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