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nodes/ffio/vp_ff_src_node.h

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+
+#pragma once
+#ifdef VP_WITH_FFMPEG
+#include "ff_src.h"
+#include "../vp_src_node.h"
+
+namespace vp_nodes {
+    /**
+     * universal SRC node using FFmpeg.
+     * 
+     * support uri:
+     * 1. path of file streams like `./vp_data/vp_test.mp4`.
+     * 2. url of network streams like `rtsp://192.168.77.68/main_stream`.
+     */
+    class vp_ff_src_node final: public vp_src_node {
+    private:
+        /* inner members. */
+        std::string m_decoder_name = "";
+        std::string m_uri = "";
+        // 0 means no skip
+        int m_skip_interval = 0;
+
+        /**
+         * demux & decode.
+         */
+        ff_src_ptr m_ff_src = nullptr;
+    protected:
+        /**
+         * get frames using FFmpeg.
+         */
+        virtual void handle_run() override;
+    public:
+        /**
+         * create vp_ff_src_node instance using initial parameters.
+         * 
+         * @param node_name specify the name of SRC node.
+         * @param channel_index specify the channel index of SRC node.
+         * @param uri specify the uri to be opened by SRC node.
+         * @param decoder_name specify the decoder name (`h264`/`hevc`/`h264_cuvid`/`hevc_cuvid`) used for decoding in FFmpeg.
+         * @param resize_ratio specify the resize ratio applied to frames.
+         * 
+         * @note
+         * the decoder specified by `decoder_name` MUST be supported already in FFmpeg, 
+         * we can run `ffmpeg -decoders` to show list of decoders supported in FFmpeg.
+         * if the decoder not found, please reconfigure & rebuild your FFmpeg.
+         */
+        vp_ff_src_node(const std::string& node_name, 
+                              int channel_index,
+                              const std::string& uri,
+                              const std::string& decoder_name = "h264",
+                              float resize_ratio = 1.0,
+                              int skip_interval = 0);
+        ~vp_ff_src_node();
+
+        /**
+         * return uri of SRC node.
+         */
+        virtual std::string to_string() override;
+    };
+}
+#endif