feat: add support of codec plugin

ext-codec/G711Rtp.h

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
+ *
+ * This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
+ *
+ * Use of this source code is governed by MIT-like license that can be found in the
+ * LICENSE file in the root of the source tree. All contributing project authors
+ * may be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef ZLMEDIAKIT_G711RTP_H
+#define ZLMEDIAKIT_G711RTP_H
+
+#include "Rtsp/RtpCodec.h"
+#include "Extension/Frame.h"
+#include "Extension/CommonRtp.h"
+
+namespace mediakit {
+
+/**
+ * G711 rtp编码类
+ */
+class G711RtpEncoder : public RtpCodec {
+public:
+    using Ptr = std::shared_ptr<G711RtpEncoder>;
+
+    /**
+     * 构造函数
+     * @param codec 编码类型
+     * @param channels 通道数
+     */
+    G711RtpEncoder(CodecId codec, uint32_t channels);
+
+    /**
+     * 输入帧数据并编码成rtp
+     */
+    bool inputFrame(const Frame::Ptr &frame) override;
+
+private:
+    uint32_t _channels = 1;
+    FrameImp::Ptr _cache_frame;
+};
+
+}//namespace mediakit
+#endif //ZLMEDIAKIT_G711RTP_H