gstreamer的c api写一个读取视频的程序
时间: 2024-06-11 10:04:06 浏览: 14
以下是使用GStreamer C API编写的读取视频的程序示例:
```
#include <stdio.h>
#include <gst/gst.h>
int main(int argc, char *argv[]) {
GstElement *pipeline, *source, *decoder, *sink;
GstBus *bus;
GstMessage *msg;
GstStateChangeReturn ret;
/* Initialize GStreamer */
gst_init(&argc, &argv);
/* Create the elements */
source = gst_element_factory_make("filesrc", "source");
decoder = gst_element_factory_make("decodebin", "decoder");
sink = gst_element_factory_make("autovideosink", "sink");
/* Create the pipeline */
pipeline = gst_pipeline_new("video-player");
if (!pipeline || !source || !decoder || !sink) {
fprintf(stderr, "Failed to create elements\n");
return -1;
}
/* Set the input file location */
g_object_set(G_OBJECT(source), "location", argv[1], NULL);
/* Add elements to the pipeline */
gst_bin_add_many(GST_BIN(pipeline), source, decoder, sink, NULL);
/* Link the elements */
gst_element_link(source, decoder);
gst_element_link(decoder, sink);
/* Set the pipeline to playing state */
ret = gst_element_set_state(pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
fprintf(stderr, "Failed to set pipeline to playing state\n");
gst_object_unref(pipeline);
return -1;
}
/* Wait until error or end of stream */
bus = gst_element_get_bus(pipeline);
msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
/* Parse message */
if (msg != NULL) {
GError *err;
gchar *debug_info;
switch (GST_MESSAGE_TYPE(msg)) {
case GST_MESSAGE_ERROR:
gst_message_parse_error(msg, &err, &debug_info);
fprintf(stderr, "Error received from element %s: %s\n", GST_OBJECT_NAME(msg->src), err->message);
fprintf(stderr, "Debugging information: %s\n", debug_info ? debug_info : "none");
g_error_free(err);
g_free(debug_info);
break;
case GST_MESSAGE_EOS:
fprintf(stderr, "End of stream reached\n");
break;
default:
fprintf(stderr, "Unexpected message received\n");
break;
}
gst_message_unref(msg);
}
/* Free resources */
gst_object_unref(bus);
gst_element_set_state(pipeline, GST_STATE_NULL);
gst_object_unref(pipeline);
return 0;
}
```
该程序使用filesrc元素从输入文件读取视频数据,使用decodebin元素动态选择适当的解码器,并使用autovideosink元素将视频渲染到显示器上。程序通过设置pipeline的状态为GST_STATE_PLAYING来启动播放,并通过gst_bus_timed_pop_filtered()函数等待错误或流结束消息。一旦收到消息,程序解析消息类型并退出播放。最后,程序释放所有资源并返回。
相关推荐
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![application/x-zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)