Gstreamer Mp3播放器程序测试

#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！！