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摄像头原始数据读取——gstreamer(gst_parse_launch)

#include <stdio.h>
#include <string.h>
#include <stdlib.h>#ifdef __cplusplus
extern "C" {
#endif#include <gst/gst.h>#ifdef __cplusplus
};
#endifstatic gboolean bus_msg_timeout(GstBus *bus) 
{GstMessage *bus_msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE,GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS);if (bus_msg != NULL) {GError *err;gchar *debug_info;switch (GST_MESSAGE_TYPE(bus_msg)) {case GST_MESSAGE_ERROR:gst_message_parse_error(bus_msg, &err, &debug_info);g_printerr("Error received from element %s: %s\n",GST_OBJECT_NAME(bus_msg->src), err->message);g_printerr("Debugging information: %s\n",debug_info ? debug_info : "none");g_clear_error(&err);g_free(debug_info);break;case GST_MESSAGE_EOS:g_print("End-Of-Stream reached.\n");break;case GST_MESSAGE_STATE_CHANGED:break;default:break;}gst_message_unref(bus_msg);}return TRUE;
}int main(int argc, char *argv[]) 
{GMainLoop *main_loop;GstElement *element_pipeline;GstBus *bus_ptr;GstMessage *msg;// 初始化GStreamergst_init(&argc, &argv);// 使用v4l2src作为视频源，videoconvert进行格式转换，autovideosink自动选择视频输出element_pipeline = gst_parse_launch("v4l2src device=/dev/video0 ! videoconvert ! autovideosink", NULL);// 创建事件循环main_loop = g_main_loop_new(NULL, FALSE);// 获取总线以监听消息bus_ptr = gst_element_get_bus(element_pipeline);// 添加一个定时器来检查总线上的消息g_timeout_add_seconds(1, (GSourceFunc)bus_msg_timeout, bus_ptr);// 开始播放管道gst_element_set_state(element_pipeline, GST_STATE_PLAYING);// 运行事件循环g_main_loop_run(main_loop);// 清理gst_element_set_state(element_pipeline, GST_STATE_NULL);gst_object_unref(bus_ptr);gst_object_unref(element_pipeline);g_main_loop_unref(main_loop);return 0;
}