c语言gstreamer 转码为Mat
时间: 2024-06-13 09:09:13 浏览: 15
根据提供的引用内容,我们可以得知音视频数据在传输过程中需要进行压缩编码,而在接收端需要进行解码。因此,如果我们想要将C语言中的GStreamer转码为Mat,我们需要先对音视频数据进行解码,然后再进行转码。
以下是将音视频数据解码为Mat的示例代码:
```c
#include <gst/gst.h>
#include <opencv2/opencv.hpp>
int main(int argc, char *argv[]) {
GstElement *pipeline, *source, *decoder, *sink;
GstBus *bus;
GstMessage *msg;
GstStateChangeReturn ret;
gboolean terminate = FALSE;
/* 初始化GStreamer */
gst_init(&argc, &argv);
/* 创建GStreamer元素 */
source = gst_element_factory_make("filesrc", "source");
decoder = gst_element_factory_make("decodebin", "decoder");
sink = gst_element_factory_make("appsink", "sink");
/* 创建空的管道 */
pipeline = gst_pipeline_new("test-pipeline");
/* 确保所有元素都创建成功 */
if (!pipeline || !source || !decoder || !sink) {
g_printerr("Not all elements could be created.\n");
return -1;
}
/* 将元素添加到管道中 */
gst_bin_add_many(GST_BIN(pipeline), source, decoder, sink, NULL);
/* 连接元素 */
if (!gst_element_link(source, decoder)) {
g_printerr("Source and decoder could not be linked.\n");
gst_object_unref(pipeline);
return -1;
}
if (!gst_element_link(decoder, sink)) {
g_printerr("Decoder and sink could not be linked.\n");
gst_object_unref(pipeline);
return -1;
}
/* 设置文件源的位置 */
g_object_set(source, "location", argv[1], NULL);
/* 启动管道 */
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;
}
/* 等待管道结束或出现错误 */
bus = gst_element_get_bus(pipeline);
do {
msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE,
GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
/* 处理消息 */
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);
g_printerr("Error received from element %s: %s\n",
GST_OBJECT_NAME(msg->src), err->message);
g_printerr("Debugging information: %s\n",
debug_info ? debug_info : "none");
g_clear_error(&err);
g_free(debug_info);
terminate = TRUE;
break;
case GST_MESSAGE_EOS:
g_print("End-Of-Stream reached.\n");
terminate = TRUE;
break;
case GST_MESSAGE_STATE_CHANGED:
/* 忽略状态改变消息 */
break;
default:
/* 忽略其他消息 */
break;
}
gst_message_unref(msg);
}
} while (!terminate);
/* 停止管道 */
gst_element_set_state(pipeline, GST_STATE_NULL);
/* 清理 */
gst_object_unref(GST_OBJECT(pipeline));
return 0;
}
```
在上述代码中,我们使用了GStreamer库来解码音视频数据,并将其转换为Mat格式。具体来说,我们创建了一个包含文件源、解码器和应用程序接收器的管道,并将它们连接在一起。然后,我们设置文件源的位置,并启动管道。最后,我们等待管道结束或出现错误,并在结束时停止管道并清理资源。
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