写一个deepstream c++版本推流代码

DeepStream是一个基于NVIDIA Jetson平台和NVIDIA GPU的实时AI分析框架。在DeepStream中，可以使用多个插件来执行视频编解码、对象检测、流媒体输出等任务。下面是使用DeepStream C API推流的示例代码：

#include <gst/gst.h>
#include <gst/app/gstappsink.h>
#include <gst/app/gstappsrc.h>
#include <glib.h>

#define APPSRC_PIPELINE_DESC "appsrc name=src ! videoconvert ! video/x-raw,format=I420,width=640,height=480,framerate=30/1 ! nvvideoconvert ! nvv4l2h264enc ! h264parse ! rtph264pay name=pay0 pt=96"
#define APPSRC_NAME "src"
#define APPSINK_PIPELINE_DESC "udpsink host=127.0.0.1 port=5000"

static GstElement *appsrc, *appsink;
static GstCaps *appsrc_caps;

static gboolean bus_callback(GstBus *bus, GstMessage *msg, gpointer data) {
    GMainLoop *loop = (GMainLoop *) data;
    switch (GST_MESSAGE_TYPE(msg)) {
        case GST_MESSAGE_ERROR:
            g_print("Error received from element %s: %s\n",
                    GST_OBJECT_NAME(msg->src), msg->structure ?
                            gst_structure_to_string(msg->structure) : "NULL");
            g_print("Application exiting...\n");
            g_main_loop_quit(loop);
            break;
        case GST_MESSAGE_EOS:
            g_print("End-Of-Stream reached.\n");
            g_main_loop_quit(loop);
            break;
        default:
            break;
    }
    return TRUE;
}

static void start_pipeline() {
    GstPipeline *pipeline;
    GstBus *bus;
    GMainLoop *loop;

    // Initialize GStreamer
    gst_init(NULL, NULL);

    // Create pipeline
    pipeline = GST_PIPELINE(gst_parse_launch(APPSRC_PIPELINE_DESC " " APPSINK_PIPELINE_DESC, NULL));

    // Get appsrc element
    appsrc = gst_bin_get_by_name(GST_BIN(pipeline), APPSRC_NAME);

    // Set appsrc caps
    appsrc_caps = gst_caps_new_simple("video/x-raw",
                                      "format", G_TYPE_STRING, "I420",
                                      "width", G_TYPE_INT, 640,
                                      "height", G_TYPE_INT, 480,
                                      "framerate", GST_TYPE_FRACTION, 30, 1,
                                      NULL);
    g_object_set(G_OBJECT(appsrc), "caps", appsrc_caps, NULL);
    gst_caps_unref(appsrc_caps);

    // Get appsink element
    appsink = gst_bin_get_by_name(GST_BIN(pipeline), "sink");

    // Start pipeline
    loop = g_main_loop_new(NULL, FALSE);
    bus = gst_pipeline_get_bus(pipeline);
    gst_bus_add_watch(bus, bus_callback, loop);
    gst_element_set_state(GST_ELEMENT(pipeline), GST_STATE_PLAYING);
    g_main_loop_run(loop);

    // Clean up
    g_main_loop_unref(loop);
    gst_object_unref(bus);
    gst_element_set_state(GST_ELEMENT(pipeline), GST_STATE_NULL);
    gst_object_unref(GST_OBJECT(pipeline));
}

int main(int argc, char *argv[]) {
    start_pipeline();
    return 0;
}

在上面的示例中，我们使用了一个包含appsrc和appsink的GStreamer pipeline，将一个640x480的I420格式的视频流编码为H.264