Refactor signaling for video and audio (#51)

* add audio and signal request.

* disable audio by default.

* fix SignalProvide.

* disable estimator when track disabled.

pkg/types/webrtc.go

@@ -18,18 +18,40 @@ type ICEServer struct {
 	Credential string   `mapstructure:"credential" json:"credential,omitempty"`
 }
 
+type PeerVideo struct {
+	Disabled bool   `json:"disabled"`
+	ID       string `json:"id"`
+	Video    string `json:"video"` // TODO: Remove this, used for compatibility with old clients.
+	Auto     bool   `json:"auto"`
+}
+
+type PeerVideoRequest struct {
+	Disabled *bool           `json:"disabled,omitempty"`
+	Selector *StreamSelector `json:"selector,omitempty"`
+	Auto     *bool           `json:"auto,omitempty"`
+}
+
+type PeerAudio struct {
+	Disabled bool `json:"disabled"`
+}
+
+type PeerAudioRequest struct {
+	Disabled *bool `json:"disabled,omitempty"`
+}
+
 type WebRTCPeer interface {
 	CreateOffer(ICERestart bool) (*webrtc.SessionDescription, error)
 	CreateAnswer() (*webrtc.SessionDescription, error)
 	SetRemoteDescription(webrtc.SessionDescription) error
 	SetCandidate(webrtc.ICECandidateInit) error
 
-	SetVideo(StreamSelector) error
-	VideoID() (string, bool)
 	SetPaused(isPaused bool) error
 	Paused() bool
-	SetVideoAuto(auto bool)
-	VideoAuto() bool
+
+	SetVideo(PeerVideoRequest) error
+	Video() PeerVideo
+	SetAudio(PeerAudioRequest) error
+	Audio() PeerAudio
 
 	SendCursorPosition(x, y int) error
 	SendCursorImage(cur *CursorImage, img []byte) error