优化frame性能及整理代码

src/Extension/L16.cpp

@@ -12,6 +12,43 @@
 
 namespace mediakit{
 
+/**
+ * L16类型SDP
+ */
+class L16Sdp : public Sdp {
+public:
+    /**
+     * L16采样位数固定为16位
+     * @param codecId CodecL16
+     * @param sample_rate 音频采样率
+     * @param payload_type rtp payload
+     * @param bitrate 比特率
+     */
+    L16Sdp(CodecId codecId,
+           int sample_rate,
+           int channels,
+           int bitrate = 128,
+           int payload_type = 98) : Sdp(sample_rate,payload_type), _codecId(codecId){
+        _printer << "m=audio 0 RTP/AVP " << payload_type << "\r\n";
+        if (bitrate) {
+            _printer << "b=AS:" << bitrate << "\r\n";
+        }
+        _printer << "a=rtpmap:" << payload_type << " L16/" << sample_rate  << "/" << channels << "\r\n";
+        _printer << "a=control:trackID=" << (int)TrackAudio << "\r\n";
+    }
+
+    string getSdp() const override {
+        return _printer;
+    }
+
+    CodecId getCodecId() const override {
+        return _codecId;
+    }
+private:
+    _StrPrinter _printer;
+    CodecId _codecId;
+};
+
 Sdp::Ptr L16Track::getSdp() {
     WarnL << "Enter  L16Track::getSdp function";
     if(!ready()){
@@ -21,6 +58,10 @@ Sdp::Ptr L16Track::getSdp() {
     return std::make_shared<L16Sdp>(getCodecId(), getAudioSampleRate(), getAudioChannel(), getBitRate() / 1024);
 }
 
+Track::Ptr L16Track::clone() {
+    return std::make_shared<std::remove_reference<decltype(*this)>::type >(*this);
+}
+
 }//namespace mediakit