初步完成265 rtp打包

整理代码

src/Extension/AAC.h

@@ -29,6 +29,8 @@
 
 #include "Frame.h"
 #include "Track.h"
+#include "RtspMuxer/RtspSdp.h"
+
 
 namespace mediakit{
 
@@ -259,6 +261,49 @@ private:
 };
 
 
+/**
+* aac类型SDP
+*/
+class AACSdp : public Sdp {
+public:
+
+    /**
+     *
+     * @param aac_cfg aac两个字节的配置描述
+     * @param sample_rate 音频采样率
+     * @param playload_type rtp playload type 默认98
+     * @param bitrate 比特率
+     */
+    AACSdp(const string &aac_cfg,
+           int sample_rate,
+           int playload_type = 98,
+           int bitrate = 128) : Sdp(sample_rate,playload_type){
+        _printer << "m=audio 0 RTP/AVP " << playload_type << "\r\n";
+        _printer << "b=AS:" << bitrate << "\r\n";
+        _printer << "a=rtpmap:" << playload_type << " MPEG4-GENERIC/" << sample_rate << "\r\n";
+
+        char configStr[32] = {0};
+        snprintf(configStr, sizeof(configStr), "%02X%02X", (uint8_t)aac_cfg[0], (uint8_t)aac_cfg[1]);
+        _printer << "a=fmtp:" << playload_type << " streamtype=5;profile-level-id=1;mode=AAC-hbr;"
+                 << "sizelength=13;indexlength=3;indexdeltalength=3;config="
+                 << configStr << "\r\n";
+        _printer << "a=control:trackID=" << getTrackType() << "\r\n";
+    }
+
+    string getSdp() const override {
+        return _printer;
+    }
+
+    TrackType getTrackType() const override {
+        return TrackAudio;
+    }
+    CodecId getCodecId() const override {
+        return CodecAAC;
+    }
+private:
+    _StrPrinter _printer;
+};
+
 }//namespace mediakit