写一个deepstream c++版本推流代码

### 回答1：
以下是使用DeepStream SDK C版本推流的示例代码。在这个示例中，我们将从网络摄像头读取视频流，进行推流并在控制台输出日志。请注意，这个示例假设你已经配置好了DeepStream SDK，包括安装必要的库和设置环境变量。

#include <gst/gst.h>
#include <glib.h>

static GMainLoop *loop;

static gboolean
bus_call(GstBus *bus, GstMessage *msg, gpointer data)
{
    GMainLoop *loop = (GMainLoop *) data;
    switch (GST_MESSAGE_TYPE(msg)) {
        case GST_MESSAGE_EOS:
            g_print("End of stream\n");
            g_main_loop_quit(loop);
            break;
        case GST_MESSAGE_ERROR: {
            gchar *debug;
            GError *error;
            gst_message_parse_error(msg, &error, &debug);
            g_free(debug);
            g_printerr("Error: %s\n", error->message);
            g_error_free(error);
            g_main_loop_quit(loop);
            break;
        }
        default:
            break;
    }
    return TRUE;
}

int
main(int argc, char *argv[])
{
    GstElement *pipeline, *source, *filter, *sink;
    GstBus *bus;
    GstCaps *caps;
    guint bus_watch_id;

    /* Initialize GStreamer */
    gst_init(&argc, &argv);
    loop = g_main_loop_new(NULL, FALSE);

    /* Create elements */
    source = gst_element_factory_make("v4l2src", "source");
    filter = gst_element_factory_make("capsfilter", "filter");
    sink = gst_element_factory_make("rtmpsink", "sink");

    /* Create empty pipeline */
    pipeline = gst_pipeline_new("test-pipeline");

    if (!pipeline || !source || !filter || !sink) {
        g_printerr("Not all elements could be created.\n");
        return -1;
    }

    /* Build the pipeline */
    gst_bin_add_many(GST_BIN(pipeline), source, filter, sink, NULL);
    if (gst_element_link_many(source, filter, sink, NULL) != TRUE) {
        g_printerr("Elements could not be linked.\n");
        gst_object_unref(pipeline);
        return -1;
    }

    /* Set source properties */
    g_object_set(G_OBJECT(source), "device", "/dev/video0", NULL);

    /* Set filter properties */
    caps = gst_caps_new_simple("video/x-raw",
                               "format", G_TYPE_STRING, "YUY2",
                               "width", G_TYPE_INT, 640,
                               "height", G_TYPE_INT, 480,
                               "framerate", GST_TYPE_FRACTION, 30, 1,
                               NULL);
    g_object_set(G_OBJECT(filter), "caps", caps, NULL);
    gst_caps_unref(caps);

    /* Set sink properties */
    g_object_set(G_OBJECT(sink), "location", "rtmp://localhost/live/test", NULL);

    /* Start playing */
    gst_element_set_state(pipeline, GST_STATE_PLAYING);

    /* Wait until error or EOS */
    bus = gst_element_get_bus(pipeline);
    bus_watch_id = gst_bus_add_watch(bus, bus_call, loop);
    g_main_loop_run(loop);

    /* Clean up */
    gst_bus_remove_watch(bus, bus_watch_id);
    gst_object_unref(bus);
    gst_element_set_state(pipeline, GST_STATE_NULL);
    gst_object_unref(pipeline);
    g_main_loop_unref(loop);

    return 0;
}

### 回答2：
DeepStream是NVIDIA开发的用于实时视频分析的框架，提供了用于推流的插件。下面是一个简单的DeepStream C版本推流代码示例：

#include <stdio.h>
#include <gst/gst.h>
#include <gst/gstinfo.h>

#define WIDTH 1280
#define HEIGHT 720
#define FRAMERATE_N 30
#define FRAMERATE_D 1

static gboolean bus_call(GstBus *bus, GstMessage *msg, gpointer data) {
    GMainLoop *loop = (GMainLoop *)data;

    switch (GST_MESSAGE_TYPE(msg)) {
        case GST_MESSAGE_EOS:
            g_print("End of stream\n");
            g_main_loop_quit(loop);
            break;

        case GST_MESSAGE_ERROR: {
            gchar *debug;
            GError *error;

            gst_message_parse_error(msg, &error, &debug);
            g_free(debug);

            g_printerr("Error: %s\n", error->message);
            g_error_free(error);

            g_main_loop_quit(loop);
            break;
        }
        default:
            break;
    }

    return TRUE;
}

int main(int argc, char *argv[]) {
    GMainLoop *loop;
    GstElement *pipeline, *src, *streammux, *pgie, *nvvidconv, *nvosd, *enc, *rtppay, *sink;
    GstCaps *caps;
    GstBus *bus;

    /* 初始化GStreamer */
    gst_init(&argc, &argv);
    loop = g_main_loop_new(NULL, FALSE);

    /* 创建pipeline */
    pipeline = gst_pipeline_new("pipeline");

    /* 创建source element，用于读取视频源 */
    src = gst_element_factory_make("v4l2src", "source");
    g_object_set(G_OBJECT(src), "device", "/dev/video0", NULL);

    /* 创建streammux element，用于合并多个流成一个 */
    streammux = gst_element_factory_make("nvstreammux", "stream-muxer");
    g_object_set(G_OBJECT(streammux), "width", WIDTH, "height", HEIGHT, NULL);
    g_object_set(G_OBJECT(streammux), "live-source", 1, NULL);

    /* 创建pgie element，用于深度学习物体检测 */
    pgie = gst_element_factory_make("nvinfer", "primary-inference");
    g_object_set(G_OBJECT(pgie), "config-file-path", "pgie_config.txt", NULL);

    /* 创建nvvidconv element，用于格式转换 */
    nvvidconv = gst_element_factory_make("nvvideoconvert", "nvvideo-converter");

    /* 创建nvosd element，用于添加物体检测结果的标记 */
    nvosd = gst_element_factory_make("nvdsosd", "nv-onscreendisplay");

    /* 创建encoder element，用于编码 */
    enc = gst_element_factory_make("nvv4l2h264enc", "encoder");

    /* 创建rtppay element，用于封装为RTP包 */
    rtppay = gst_element_factory_make("rtph264pay", "rtppay");

    /* 创建sink element，用于推流 */
    sink = gst_element_factory_make("udpsink", "sink");
    g_object_set(G_OBJECT(sink), "host", "127.0.0.1", "port", 5000, NULL);

    if (!pipeline || !src || !streammux || !pgie || !nvvidconv || !nvosd || !enc || !rtppay || !sink) {
        g_error("Failed to create elements");
        return -1;
    }

    /* 将所有元素添加到pipeline中 */
    gst_bin_add_many(GST_BIN(pipeline), src, streammux, pgie, nvvidconv, nvosd, enc, rtppay, sink, NULL);

    /* 链接元素 */
    gst_element_link(src, streammux);
    gst_element_link(streammux, pgie);
    gst_element_link(pgie, nvvidconv);
    gst_element_link(nvvidconv, nvosd);
    gst_element_link(nvosd, enc);
    gst_element_link(enc, rtppay);
    gst_element_link(rtppay, sink);

    /* 设置输入视频格式 */
    caps = gst_caps_new_simple("video/x-raw",
                               "format", G_TYPE_STRING, "I420",
                               "width", G_TYPE_INT, WIDTH,
                               "height", G_TYPE_INT, HEIGHT,
                               "framerate", GST_TYPE_FRACTION, FRAMERATE_N, FRAMERATE_D,
                               NULL);
    g_object_set(G_OBJECT(src), "caps", caps, NULL);
    gst_caps_unref(caps);

    /* 设置bus，用于处理消息 */
    bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
    gst_bus_add_watch(bus, bus_call, loop);

    /* 启动pipeline */
    gst_element_set_state(pipeline, GST_STATE_PLAYING);

    /* 进入主循环 */
    g_main_loop_run(loop);

    /* 停止pipeline */
    gst_element_set_state(pipeline, GST_STATE_NULL);

    /* 释放资源 */
    gst_object_unref(GST_OBJECT(pipeline));
    g_main_loop_unref(loop);

    return 0;
}

这个代码使用GStreamer框架创建了一个DeepStream的pipeline，读取了摄像头的视频流，并对视频进行了物体检测和编码后推流。请注意，这只是一个简单的示例代码，实际情况下可能需要根据具体需求进行调整和扩展。