#include <gst/gst.h>
#include <glib.h>
//定义消息处理函数,
static gboolean bus_call(GstBus *bus,GstMessage *msg,gpointerdata)
{
GMainLoop *loop= (GMainLoop *) data;//这个是主循环的指针，在接受EOS消息时退出循环
switch(GST_MESSAGE_TYPE(msg))
{
caseGST_MESSAGE_EOS:
g_print("End of stream\n");
g_main_loop_quit(loop);
break;
case GST_MESSAGE_ERROR:
{
gchar *debug;
GError *error;
gst_message_parse_error(msg,&error,&debug);
g_free(debug);
g_printerr("ERROR:%s\n",error->message);
g_error_free(error);
g_main_loop_quit(loop);
break;
}
default:
break;
}
return TRUE;
}
int main(int argc,char *argv[])
{
GMainLoop*loop;
GstElement*pipeline,*source,*decoder,*sink;//定义组件
GstBus *bus;
gst_init(&argc,&argv);
loop =g_main_loop_new(NULL,FALSE);//创建主循环，在执行g_main_loop_run后正式开始循环
if(argc != 2)
{
g_printerr("Usage:%s <mp3filename>\n",argv[0]);
return -1;
}
//创建管道和组件
pipeline =gst_pipeline_new("audio-player");
source =gst_element_factory_make("filesrc","file-source");
decoder =gst_element_factory_make("mad","mad-decoder");
sink =gst_element_factory_make("autoaudiosink","audio-output");
if(!pipeline||!source||!decoder||!sink){
g_printerr("One element could not be created.Exiting.\n");
return -1;
}
//设置 source的location 参数。即 文件地址.
g_object_set(G_OBJECT(source),"location",argv[1],NULL);
//得到 管道的消息总线
bus =gst_pipeline_get_bus(GST_PIPELINE(pipeline));
//添加消息监视器
gst_bus_add_watch(bus,bus_call,loop);
gst_object_unref(bus);
//把组件添加到管道中.管道是一个特殊的组件，可以更好的让数据流动
gst_bin_add_many(GST_BIN(pipeline),source,decoder,sink,NULL);
//依次连接组件
gst_element_link_many(source,decoder,sink,NULL);
//开始播放
gst_element_set_state(pipeline,GST_STATE_PLAYING);
g_print("Running\n");
//开始循环
g_main_loop_run(loop);
g_print("Returned,stoppingplayback\n");
gst_element_set_state(pipeline,GST_STATE_NULL);
gst_object_unref(GST_OBJECT(pipeline));
return 0;
}
root@hello-desktop:~/src/GstreamerPro/mp3test# ls
mp3test.c
root@hello-desktop:~/src/GstreamerPro/mp3test# gcc -Wall $(pkg-config --cflags --libs gstreamer-0.10) -g mp3test.c -o mp3test
root@hello-desktop:~/src/GstreamerPro/mp3test# ./mp3test /root/Media/test.mp3
Running
^C
测试可行！！