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go2tv.go
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go2tv.go
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package main
import (
"context"
_ "embed"
"errors"
"flag"
"fmt"
"io"
"net/url"
"os"
"os/exec"
"os/signal"
"path/filepath"
"runtime"
"sort"
"strings"
"syscall"
"github.com/alexballas/go2tv/devices"
"github.com/alexballas/go2tv/httphandlers"
"github.com/alexballas/go2tv/soapcalls"
"github.com/alexballas/go2tv/soapcalls/utils"
)
var (
//go:embed version.txt
version string
errNoflag = errors.New("no flag used")
mediaArg = flag.String("v", "", "Local path to the video/audio file. (Triggers the CLI mode)")
urlArg = flag.String("u", "", "HTTP URL to the media file. URL streaming does not support seek operations. (Triggers the CLI mode)")
subsArg = flag.String("s", "", "Local path to the subtitles file.")
targetPtr = flag.String("t", "", "Cast to a specific UPnP/DLNA Media Renderer URL.")
transcodePtr = flag.Bool("tc", false, "Use ffmpeg to transcode input video file.")
listPtr = flag.Bool("l", false, "List all available UPnP/DLNA Media Renderer models and URLs.")
versionPtr = flag.Bool("version", false, "Print version.")
ErrNoCombi = errors.New("can't combine -l with other flags")
ErrFailtoList = errors.New("failed to list devices")
)
type dummyScreen struct {
ctxCancel context.CancelFunc
}
type flagResults struct {
dmrURL string
exit bool
}
func main() {
if err := run(); err != nil {
if errors.Is(err, errNoflag) {
flag.Usage()
os.Exit(0)
}
fmt.Fprintf(os.Stderr, "Encountered error(s): %s\n", err)
os.Exit(1)
}
}
func run() error {
var absMediaFile, mediaType string
var mediaFile interface{}
var isSeek bool
var s *httphandlers.HTTPserver
exitCTX, cancel := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
defer cancel()
flag.Parse()
flagRes, err := processflags()
if err != nil {
return err
}
if flagRes.exit {
return nil
}
if *mediaArg != "" {
mediaFile = *mediaArg
}
if *mediaArg == "" && *urlArg != "" {
mediaURL, err := utils.StreamURL(context.Background(), *urlArg)
if err != nil {
return err
}
mediaURLinfo, err := utils.StreamURL(context.Background(), *urlArg)
if err != nil {
return err
}
mediaType, err = utils.GetMimeDetailsFromStream(mediaURLinfo)
if err != nil {
return err
}
mediaFile = mediaURL
if strings.Contains(mediaType, "image") {
readerToBytes, err := io.ReadAll(mediaURL)
mediaURL.Close()
if err != nil {
return err
}
mediaFile = readerToBytes
}
}
switch t := mediaFile.(type) {
case string:
absMediaFile, err = filepath.Abs(t)
if err != nil {
return err
}
mfile, err := os.Open(absMediaFile)
if err != nil {
return err
}
mediaFile = absMediaFile
mediaType, err = utils.GetMimeDetailsFromFile(mfile)
if err != nil {
return err
}
if !*transcodePtr {
isSeek = true
}
case io.ReadCloser, []byte:
absMediaFile = *urlArg
}
absSubtitlesFile, err := filepath.Abs(*subsArg)
if err != nil {
return err
}
scr := &dummyScreen{ctxCancel: cancel}
tvdata, err := soapcalls.NewTVPayload(&soapcalls.Options{
DMR: flagRes.dmrURL,
Media: absMediaFile,
Subs: absSubtitlesFile,
Mtype: mediaType,
Transcode: *transcodePtr,
Seek: isSeek,
LogOutput: nil,
})
if err != nil {
return err
}
s = httphandlers.NewServer(tvdata.ListenAddress())
serverStarted := make(chan error)
// We pass the tvdata here as we need the callback handlers to be able to react
// to the different media renderer states.
go func() {
s.StartServer(serverStarted, mediaFile, absSubtitlesFile, tvdata, scr)
}()
// Wait for HTTP server to properly initialize
if err := <-serverStarted; err != nil {
return err
}
err = tvdata.SendtoTV("Play1")
if err != nil {
return err
}
<-exitCTX.Done()
if tvdata != nil {
_ = tvdata.SendtoTV("Stop")
}
if s != nil {
s.StopServer()
}
return nil
}
func listFlagFunction() error {
flagsEnabled := 0
flag.Visit(func(*flag.Flag) {
flagsEnabled++
})
if flagsEnabled > 1 {
return ErrNoCombi
}
deviceList, err := devices.LoadSSDPservices(1)
if err != nil {
return ErrFailtoList
}
fmt.Println()
// We loop through this map twice as we need to maintain
// the correct order.
var keys []string
for k := range deviceList {
keys = append(keys, k)
}
sort.Strings(keys)
for q, k := range keys {
boldStart := ""
boldEnd := ""
if runtime.GOOS == "linux" {
boldStart = "\033[1m"
boldEnd = "\033[0m"
}
fmt.Printf("%sDevice %v%s\n", boldStart, q+1, boldEnd)
fmt.Printf("%s--------%s\n", boldStart, boldEnd)
fmt.Printf("%sModel:%s %s\n", boldStart, boldEnd, k)
fmt.Printf("%sURL:%s %s\n", boldStart, boldEnd, deviceList[k])
fmt.Println()
}
return nil
}
func processflags() (*flagResults, error) {
res := &flagResults{}
if checkVerflag() {
res.exit = true
return res, nil
}
if *mediaArg == "" && !*listPtr && *urlArg == "" {
return nil, fmt.Errorf("checkflags error: %w", errNoflag)
}
if err := checkTCflag(); err != nil {
return nil, fmt.Errorf("checkflags error: %w", err)
}
if err := checkTflag(res); err != nil {
return nil, fmt.Errorf("checkflags error: %w", err)
}
list, err := checkLflag()
if err != nil {
return nil, fmt.Errorf("checkflags error: %w", err)
}
if list {
res.exit = true
return res, nil
}
if err := checkVflag(); err != nil {
return nil, fmt.Errorf("checkflags error: %w", err)
}
if err := checkSflag(); err != nil {
return nil, fmt.Errorf("checkflags error: %w", err)
}
return res, nil
}
func checkVflag() error {
if !*listPtr && *urlArg == "" {
if _, err := os.Stat(*mediaArg); os.IsNotExist(err) {
return fmt.Errorf("checkVflags error: %w", err)
}
}
return nil
}
func checkSflag() error {
if *subsArg != "" {
if _, err := os.Stat(*subsArg); os.IsNotExist(err) {
return fmt.Errorf("checkSflags error: %w", err)
}
return nil
}
// The checkVflag should happen before checkSflag so we're safe to call
// *mediaArg here. If *subsArg is empty, try to automatically find the
// srt from the media file filename.
*subsArg = (*mediaArg)[0:len(*mediaArg)-
len(filepath.Ext(*mediaArg))] + ".srt"
return nil
}
func checkTCflag() error {
if *transcodePtr {
_, err := exec.LookPath("ffmpeg")
if err != nil {
return fmt.Errorf("checkTCflag parse error: %w", err)
}
}
return nil
}
func checkTflag(res *flagResults) error {
if *targetPtr != "" {
// Validate URL before proceeding.
_, err := url.ParseRequestURI(*targetPtr)
if err != nil {
return fmt.Errorf("checkTflag parse error: %w", err)
}
res.dmrURL = *targetPtr
return nil
}
deviceList, err := devices.LoadSSDPservices(1)
if err != nil {
return fmt.Errorf("checkTflag service loading error: %w", err)
}
res.dmrURL, err = devices.DevicePicker(deviceList, 1)
if err != nil {
return fmt.Errorf("checkTflag device picker error: %w", err)
}
return nil
}
func checkLflag() (bool, error) {
if *listPtr {
if err := listFlagFunction(); err != nil {
return false, fmt.Errorf("checkLflag error: %w", err)
}
return true, nil
}
return false, nil
}
func checkVerflag() bool {
if *versionPtr && os.Args[1] == "-version" {
fmt.Printf("Go2TV Version: %s\n", version)
return true
}
return false
}
func (s *dummyScreen) EmitMsg(msg string) {
fmt.Println(msg)
}
func (s *dummyScreen) Fini() {
fmt.Println("exiting..")
s.ctxCancel()
}