有没有关于如何在C中使用GStreamer GstBaseTransform的完整示例？

#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>

typedef struct _CustomTransform {
  GstBaseTransform base_transform;
} CustomTransform;

GST_BOILERPLATE(CustomTransform, custom_transform, GstBaseTransform,
    GST_TYPE_BASE_TRANSFORM);

static gboolean custom_transform_set_caps(GstBaseTransform *trans,
    GstCaps *incaps, GstCaps *outcaps)
{
  // 在这里设置输入和输出的媒体格式
  return TRUE;
}

static GstFlowReturn custom_transform_transform_ip(GstBaseTransform *trans,
    GstBuffer *buf)
{
  // 在这里实现自定义的音视频转换逻辑
  return GST_FLOW_OK;
}

static void custom_transform_class_init(CustomTransformClass *klass)
{
  GstBaseTransformClass *base_transform_class = GST_BASE_TRANSFORM_CLASS(klass);

  base_transform_class->set_caps = GST_DEBUG_FUNCPTR(custom_transform_set_caps);
  base_transform_class->transform_ip = GST_DEBUG_FUNCPTR(custom_transform_transform_ip);
}

static void custom_transform_init(CustomTransform *transform)
{
  // 在这里进行初始化操作
}

int main(int argc, char *argv[])
{
  gst_init(&argc, &argv);

  // 创建自定义的转换插件实例
  CustomTransform *transform = g_object_new(CUSTOM_TYPE_TRANSFORM, NULL);

  // 设置转换插件的属性
  GstCaps *in_caps = gst_caps_new_simple("audio/x-raw", NULL);
  GstCaps *out_caps = gst_caps_new_simple("audio/x-raw", NULL);
  g_object_set(G_OBJECT(transform), "in-caps", in_caps, "out-caps", out_caps, NULL);

  // 创建GStreamer管道
  GstElement *pipeline = gst_pipeline_new("pipeline");
  GstElement *src = gst_element_factory_make("audiotestsrc", "src");
  GstElement *sink = gst_element_factory_make("autoaudiosink", "sink");

  // 添加元素到管道
  gst_bin_add_many(GST_BIN(pipeline), src, GST_ELEMENT(transform), sink, NULL);

  // 链接元素
  gst_element_link(src, GST_ELEMENT(transform));
  gst_element_link(GST_ELEMENT(transform), sink);

  // 启动管道
  gst_element_set_state(pipeline, GST_STATE_PLAYING);

  // 等待管道运行
  GstBus *bus = gst_element_get_bus(pipeline);
  GstMessage *msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE,
      GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
  gst_message_unref(msg);

  // 停止管道
  gst_element_set_state(pipeline, GST_STATE_NULL);

  // 释放资源
  gst_object_unref(GST_OBJECT(pipeline));
  gst_object_unref(GST_OBJECT(bus));

  return 0;
}