优化frame性能及整理代码

src/Extension/Opus.h

@@ -33,39 +33,5 @@ private:
     Sdp::Ptr getSdp() override ;
 };
 
-/**
- * Opus类型SDP
- */
-class OpusSdp : public Sdp {
-public:
-    /**
-     * 构造opus sdp
-     * @param sample_rate 音频采样率
-     * @param payload_type rtp payload
-     * @param bitrate 比特率
-     */
-    OpusSdp(int sample_rate,
-            int channels,
-            int bitrate = 128,
-            int payload_type = 98) : Sdp(sample_rate,payload_type){
-        _printer << "m=audio 0 RTP/AVP " << payload_type << "\r\n";
-        if (bitrate) {
-            _printer << "b=AS:" << bitrate << "\r\n";
-        }
-        _printer << "a=rtpmap:" << payload_type << " opus/" << sample_rate  << "/" << channels << "\r\n";
-        _printer << "a=control:trackID=" << (int)TrackAudio << "\r\n";
-    }
-
-    string getSdp() const override {
-        return _printer;
-    }
-
-    CodecId getCodecId() const override {
-        return CodecOpus;
-    }
-private:
-    _StrPrinter _printer;
-};
-
 }//namespace mediakit
 #endif //ZLMEDIAKIT_OPUS_H