写一个deepstream推流摄像头的c++代码

以下是一个使用 DeepStream SDK 推流摄像头视频的基本 C 代码示例：

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

static GMainLoop *loop;
static GstElement *pipeline;

static void cb_new_pad(GstElement *element, GstPad *pad, gpointer data) {
  GstCaps *caps;
  GstStructure *str;
  const gchar *name;
  GstPad *videopad;

  caps = gst_pad_get_current_caps(pad);
  str = gst_caps_get_structure(caps, 0);
  name = gst_structure_get_name(str);

  if (!g_str_has_prefix(name, "video/x-raw")) {
    g_print("Ignoring '%s' pad\n", name);
    goto exit;
  }

  videopad = gst_element_get_static_pad(pipeline, "sink");
  if (!GST_PAD_IS_LINKED(videopad)) {
    if (gst_pad_link(pad, videopad) != GST_PAD_LINK_OK)
      g_print("Failed to link pads\n");
    else
      g_print("Pads linked\n");
  }
  gst_object_unref(videopad);

exit:
  gst_caps_unref(caps);
}

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

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

  /* Create the elements */
  source = gst_element_factory_make("v4l2src", "source");
  filter = gst_element_factory_make("capsfilter", "filter");
  encoder = gst_element_factory_make("x264enc", "encoder");
  sink = gst_element_factory_make("rtmpsink", "sink");

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

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

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

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

  if (!pipeline) {
    g_printerr("Pipeline could not be created.\n");
    return -1;
  }

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

  /* Connect new pad callback */
  g_signal_connect(source, "pad-added", G_CALLBACK(cb_new_pad), NULL);

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

  /* Add a bus watch for messages */
  bus = gst_element_get_bus(pipeline);
  bus_watch_id = gst_bus_add_watch(bus, (GstBusFunc)gst_bus_callback, loop);
  gst_object_unref(bus);

  /* Start the main loop */
  g_print("Running...\n");
  g_main_loop_run(loop);

  /* Free resources */
  g_source_remove(bus_watch_id);
  gst