feat: add support of codec plugin

ext-codec/AAC.h

@@ -0,0 +1,57 @@
+/*
+ * 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_AAC_H
+#define ZLMEDIAKIT_AAC_H
+
+#include "Extension/Frame.h"
+#include "Extension/Track.h"
+#define ADTS_HEADER_LEN 7
+
+namespace mediakit{
+
+/**
+ * aac音频通道
+ */
+class AACTrack : public AudioTrack {
+public:
+    using Ptr = std::shared_ptr<AACTrack>;
+
+    AACTrack() = default;
+
+    /**
+     * 通过aac extra data 构造对象
+     */
+    AACTrack(const std::string &aac_cfg);
+
+    bool ready() const override;
+    CodecId getCodecId() const override;
+    int getAudioChannel() const override;
+    int getAudioSampleRate() const override;
+    int getAudioSampleBit() const override;
+    bool inputFrame(const Frame::Ptr &frame) override;
+    toolkit::Buffer::Ptr getExtraData() const override;
+    void setExtraData(const uint8_t *data, size_t size) override;
+    bool update() override;
+
+private:
+    Sdp::Ptr getSdp(uint8_t payload_type) const override;
+    Track::Ptr clone() const override;
+    bool inputFrame_l(const Frame::Ptr &frame);
+
+private:
+    std::string _cfg;
+    int _channel = 0;
+    int _sampleRate = 0;
+    int _sampleBit = 16;
+};
+
+}//namespace mediakit
+#endif //ZLMEDIAKIT_AAC_H