Add EncoderController() codec.EncoderController in Track interface. (#614)

* Add EncoderController() codec.EncoderController in Track interface.

* Update test, add EncoderController in mockMediaStreamTrack.

mediastream_test.go

@@ -4,6 +4,7 @@ import (
 	"io"
 	"testing"
 
+	"github.com/pion/mediadevices/pkg/codec"
 	"github.com/pion/webrtc/v4"
 )
 
@@ -61,6 +62,10 @@ func (track *mockMediaStreamTrack) NewEncodedIOReader(codecName string) (io.Read
 	return nil, nil
 }
 
+func (track *mockMediaStreamTrack) EncoderController() codec.EncoderController {
+	return nil
+}
+
 func TestMediaStreamFilters(t *testing.T) {
 	audioTracks := []Track{
 		&mockMediaStreamTrack{AudioInput},

track.go

@@ -77,6 +77,8 @@ type Track interface {
 	NewEncodedReader(codecName string) (EncodedReadCloser, error)
 	// NewEncodedReader creates a new Go standard io.ReadCloser that reads the encoded data in codecName format
 	NewEncodedIOReader(codecName string) (io.ReadCloser, error)
+	// EncoderController returns the encoder controller if the track has one, else returns nil
+	EncoderController() codec.EncoderController
 }
 
 type baseTrack struct {