各协议全面支持vp8/vp9/av1编码，ertmp新增支持opus编码 (#4498)

实现功能：
- rtp 增加vp8，vp9和av1编码支持
- 实现MP4录像所需的extra_data接口
- 扩展rtmp增加对opus、vp8、vp9和av1的支持

已知问题：
- 开启enhance rtmp后，ffmpeg暂时不支持播放vp8编码格式，其他格式的支持
- vp9和av1开始播放时容易遇到卡顿情况，过几秒后好了，原因暂时未知

---------

Co-authored-by: xia-chu <771730766@qq.com>

ext-codec/VP8Rtp.h

@@ -0,0 +1,66 @@
+/*
+ * 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_VP8RTPCODEC_H
+#define ZLMEDIAKIT_VP8RTPCODEC_H
+
+#include "VP8.h"
+// for DtsGenerator
+#include "Common/Stamp.h"
+#include "Rtsp/RtpCodec.h"
+
+namespace mediakit {
+
+/**
+ * vp8 rtp解码类
+ * 将 vp8 over rtsp-rtp 解复用出 VP8Frame
+ */
+class VP8RtpDecoder : public RtpCodec {
+public:
+    using Ptr = std::shared_ptr<VP8RtpDecoder>;
+
+    VP8RtpDecoder();
+
+    /**
+     * 输入vp8 rtp包
+     * @param rtp rtp包
+     * @param key_pos 此参数忽略之
+     */
+    bool inputRtp(const RtpPacket::Ptr &rtp, bool key_pos = true) override;
+
+private:
+    bool decodeRtp(const RtpPacket::Ptr &rtp);
+    void outputFrame(const RtpPacket::Ptr &rtp);
+    void obtainFrame();
+
+private:
+    bool _gop_dropped = false;
+    bool _frame_drop = true;
+    uint16_t _last_seq = 0;
+    VP8Frame::Ptr _frame;
+    DtsGenerator _dts_generator;
+};
+
+/**
+ * vp8 rtp打包类
+ */
+class VP8RtpEncoder : public RtpCodec {
+public:
+    using Ptr = std::shared_ptr<VP8RtpEncoder>;
+
+    bool inputFrame(const Frame::Ptr &frame) override;
+
+private:
+    uint16_t _pic_id = 0;
+};
+
+}//namespace mediakit
+
+#endif //ZLMEDIAKIT_VP8RTPCODEC_H