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mediastream.go
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mediastream.go
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package mediadevices
import (
"sync"
"github.com/pion/webrtc/v3"
)
// MediaStream is an interface that represents a collection of existing tracks.
type MediaStream interface {
// GetAudioTracks implements https://w3c.github.io/mediacapture-main/#dom-mediastream-getaudiotracks
GetAudioTracks() []Track
// GetVideoTracks implements https://w3c.github.io/mediacapture-main/#dom-mediastream-getvideotracks
GetVideoTracks() []Track
// GetTracks implements https://w3c.github.io/mediacapture-main/#dom-mediastream-gettracks
GetTracks() []Track
// AddTrack implements https://w3c.github.io/mediacapture-main/#dom-mediastream-addtrack
AddTrack(t Track)
// RemoveTrack implements https://w3c.github.io/mediacapture-main/#dom-mediastream-removetrack
RemoveTrack(t Track)
}
type mediaStream struct {
tracks map[Track]struct{}
l sync.RWMutex
}
const trackTypeDefault webrtc.RTPCodecType = 0
// NewMediaStream creates a MediaStream interface that's defined in
// https://w3c.github.io/mediacapture-main/#dom-mediastream
func NewMediaStream(tracks ...Track) (MediaStream, error) {
m := mediaStream{tracks: make(map[Track]struct{})}
for _, track := range tracks {
if _, ok := m.tracks[track]; !ok {
m.tracks[track] = struct{}{}
}
}
return &m, nil
}
func (m *mediaStream) GetAudioTracks() []Track {
return m.queryTracks(webrtc.RTPCodecTypeAudio)
}
func (m *mediaStream) GetVideoTracks() []Track {
return m.queryTracks(webrtc.RTPCodecTypeVideo)
}
func (m *mediaStream) GetTracks() []Track {
return m.queryTracks(trackTypeDefault)
}
// queryTracks returns all tracks that are the same kind as t.
// If t is 0, which is the default, queryTracks will return all the tracks.
func (m *mediaStream) queryTracks(t webrtc.RTPCodecType) []Track {
m.l.RLock()
defer m.l.RUnlock()
result := make([]Track, 0)
for track := range m.tracks {
if track.Kind() == t || t == trackTypeDefault {
result = append(result, track)
}
}
return result
}
func (m *mediaStream) AddTrack(t Track) {
m.l.Lock()
defer m.l.Unlock()
if _, ok := m.tracks[t]; ok {
return
}
m.tracks[t] = struct{}{}
}
func (m *mediaStream) RemoveTrack(t Track) {
m.l.Lock()
defer m.l.Unlock()
delete(m.tracks, t)
}