/
media_tracks.go
115 lines (100 loc) · 2.86 KB
/
media_tracks.go
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package main
import (
"fmt"
"log"
vlc "github.com/adrg/libvlc-go/v3"
)
func main() {
// Initialize libVLC.
if err := vlc.Init("--quiet"); err != nil {
log.Fatal(err)
}
defer vlc.Release()
// Load media from file.
media, err := vlc.NewMediaFromPath("test.mp4")
if err != nil {
log.Fatal(err)
}
defer media.Release()
// Parse media.
if err := parseMedia(media); err != nil {
log.Fatal(err)
}
// Retrieve media tracks.
tracks, err := media.Tracks()
if err != nil {
log.Fatal(err)
}
for i, track := range tracks {
// Retrieve codec description.
codecDesc, err := track.CodecDescription()
if err != nil {
log.Fatal(err)
}
fmt.Printf("Track #%d\n", i+1)
fmt.Println("ID:", track.ID)
fmt.Println("Bit rate:", track.BitRate)
fmt.Println("Codec:", track.Codec)
fmt.Println("Original codec:", track.OriginalCodec)
fmt.Println("Codec description:", codecDesc)
fmt.Println("Profile:", track.Profile)
fmt.Println("Level:", track.Level)
fmt.Println("Language:", track.Language)
fmt.Println("Description:", track.Description)
switch track.Type {
case vlc.MediaTrackAudio:
audio := track.Audio
fmt.Println("Type: audio track")
fmt.Println("Audio channels:", audio.Channels)
fmt.Println("Audio rate:", audio.Rate)
case vlc.MediaTrackVideo:
video := track.Video
fmt.Println("Type: video track")
fmt.Println("Video width:", video.Width)
fmt.Println("Video height:", video.Height)
fmt.Printf("Aspect ratio: %d:%d\n", video.AspectRatioNum, video.AspectRatioDen)
fmt.Printf("Frame rate: %d/%d\n", video.FrameRateNum, video.FrameRateDen)
fmt.Println("Video orientation", video.Orientation)
fmt.Println("Video projection", video.Projection)
pose := video.Pose
fmt.Printf("Video viewopoint: %.2f yaw, %.2f pitch, %.2f roll, %.2f FOV\n",
pose.Yaw, pose.Pitch, pose.Roll, pose.FOV)
case vlc.MediaTrackText:
subtitle := track.Subtitle
fmt.Println("Type: subtitle track")
fmt.Println("Encoding:", subtitle.Encoding)
}
fmt.Println("---")
}
}
func parseMedia(media *vlc.Media) error {
// Retrieve media event manager.
manager, err := media.EventManager()
if err != nil {
log.Fatal(err)
}
// Create media event handler.
done := make(chan struct{})
eventCallback := func(event vlc.Event, userData interface{}) {
parseStatus, parseErr := media.ParseStatus()
if err != nil {
err = parseErr
} else if parseStatus != vlc.MediaParseDone {
err = fmt.Errorf("media parse failed with status %d", parseStatus)
}
close(done)
}
// Register media parsed changed event with the media event manager.
eventID, err := manager.Attach(vlc.MediaParsedChanged, eventCallback, media)
if err != nil {
return err
}
defer manager.Detach(eventID)
// Parse media asynchronously.
err = media.ParseWithOptions(0, vlc.MediaParseLocal, vlc.MediaParseNetwork)
if err != nil {
return err
}
<-done
return err
}