feat: 支持音频转码

transcode/transcoder.go

@@ -1,4 +1,18 @@
 package transcode
 
+import (
+	"github.com/lkmio/avformat"
+	"github.com/lkmio/avformat/utils"
+)
+
+var (
+	CreateAudioTranscoder func(src *avformat.AVStream, dst []utils.AVCodecID) (Transcoder, *avformat.AVStream, error)
+)
+
 type Transcoder interface {
+	Transcode(src *avformat.AVPacket, cb func([]byte, int)) (int, error)
+
+	GetEncoderID() utils.AVCodecID
+
+	Close()
 }