3个queue的连接到一个capsfilter插件进行多路自定义数据合并, 怎么做, 给出c代码
时间: 2023-05-11 21:03:17 浏览: 68
以下是一个简单的C语言示例代码,用于将三个队列连接到一个capsfilter插件进行多路自定义数据合并:
```
#include <gst/gst.h>
int main(int argc, char *argv[]) {
GstElement *pipeline, *queue1, *queue2, *queue3, *capsfilter;
GstCaps *caps;
GstBus *bus;
GstMessage *msg;
GstStateChangeReturn ret;
/* Initialize GStreamer */
gst_init(&argc, &argv);
/* Create the elements */
queue1 = gst_element_factory_make("queue", "queue1");
queue2 = gst_element_factory_make("queue", "queue2");
queue3 = gst_element_factory_make("queue", "queue3");
capsfilter = gst_element_factory_make("capsfilter", "capsfilter");
pipeline = gst_pipeline_new("test-pipeline");
if (!pipeline || !queue1 || !queue2 || !queue3 || !capsfilter) {
g_printerr("Not all elements could be created.\n");
return -1;
}
/* Build the pipeline */
gst_bin_add_many(GST_BIN(pipeline), queue1, queue2, queue3, capsfilter, NULL);
if (gst_element_link_many(queue1, capsfilter, NULL) != TRUE ||
gst_element_link_many(queue2, capsfilter, NULL) != TRUE ||
gst_element_link_many(queue3, capsfilter, NULL) != TRUE) {
g_printerr("Elements could not be linked.\n");
gst_object_unref(pipeline);
return -1;
}
/* Set caps on the capsfilter */
caps = gst_caps_new_simple("video/x-raw",
"format", G_TYPE_STRING, "RGB",
"width", G_TYPE_INT, 640,
"height", G_TYPE_INT, 480,
NULL);
g_object_set(G_OBJECT(capsfilter), "caps", caps, NULL);
gst_caps_unref(caps);
/* Start playing */
ret = gst_element_set_state(pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
g_printerr("Unable to set the pipeline to the playing state.\n");
gst_object_unref(pipeline);
return -1;
}
/* Wait until error or EOS */
bus = gst_element_get_bus(pipeline);
msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE,
GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
/* Free resources */
if (msg != NULL)
gst_message_unref(msg);
gst_object_unref(bus);
gst_element_set_state(pipeline, GST_STATE_NULL);
gst_object_unref(pipeline);
return 0;
}
```
这个示例代码创建了一个包含三个队列和一个capsfilter插件的GStreamer管道,并将三个队列连接到capsfilter插件,以进行多路自定义数据合并。在这个示例中,我们将capsfilter插件的输出格式设置为"video/x-raw",分辨率为640x480,格式为RGB。你可以根据自己的需求修改这些参数。
请注意,这个示例代码仅仅是一个演示,实际应用中可能需要更复杂的管道和更多的元素来实现多路数据合并。