将命令行 gst-launch-1.0 filesrc location=/data/test.wav ! wavparse ! audioconvert ! pulsesink 写成C语言代码接口

可以使用 GStreamer 库来编写C语言代码接口，下面是将命令行 gst-launch-1.0 filesrc location=/data/test.wav ! wavparse ! audioconvert ! pulsesink 转换为C语言代码的实现：

#include <gst/gst.h>

int main(int argc, char *argv[]) {
  GstElement *pipeline, *filesrc, *wavparse, *audioconvert, *pulsesink;
  GstBus *bus;
  GstMessage *msg;
  GstStateChangeReturn ret;

  /* 初始化GStreamer */
  gst_init(&argc, &argv);

  /* 创建元素 */
  filesrc = gst_element_factory_make("filesrc", "file-source");
  wavparse = gst_element_factory_make("wavparse", "wav-parser");
  audioconvert = gst_element_factory_make("audioconvert", "audio-converter");
  pulsesink = gst_element_factory_make("pulsesink", "pulse-sink");

  /* 创建管道 */
  pipeline = gst_pipeline_new("test-pipeline");

  if (!pipeline || !filesrc || !wavparse || !audioconvert || !pulsesink) {
    g_printerr("Failed to create elements");
    return -1;
  }

  /* 设置文件源 */
  g_object_set(G_OBJECT(filesrc), "location", "/data/test.wav", NULL);

  /* 将元素添加到管道中 */
  gst_bin_add_many(GST_BIN(pipeline), filesrc, wavparse, audioconvert, pulsesink, NULL);

  /* 连接元素 */
  if (!gst_element_link_many(filesrc, wavparse, audioconvert, pulsesink, NULL)) {
    g_printerr("Failed to link elements");
    gst_object_unref(pipeline);
    return -1;
  }

  /* 设置管道状态为播放 */
  ret = gst_element_set_state(pipeline, GST_STATE_PLAYING);
  if (ret == GST_STATE_CHANGE_FAILURE) {
    g_printerr("Failed to set pipeline to playing state");
    gst_object_unref(pipeline);
    return -1;
  }

  /* 等待直到管道播放完毕或出错 */
  bus = gst_element_get_bus(pipeline);
  msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE,
                                   GST_MESSAGE_ERROR | GST_MESSAGE_EOS);

  /* 处理消息 */
  if (msg != NULL) {
    gst_message_unref(msg);
  }

  /* 释放资源 */
  gst_object_unref(bus);
  gst_element_set_state(pipeline, GST_STATE_NULL);
  gst_object_unref(pipeline);
  return 0;
}

请注意，这只是一个简单的例子，您可能需要根据自己的需求进行更改。