ubuntu下 gstreamer 的配置及播放音视频例子

官方网址：http://gstreamer.freedesktop.org

Gstreamer安装:

使用sudo apt-get install 安装

sudo apt-get install libgstreamer0.10-dev gstreamer-tools gstreamer0.10-tools gstreamer0.10-doc
sudo apt-get install gstreamer0.10-plugins-base gstreamer0.10-plugins-good gstreamer0.10-plugins-ugly gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-multiverse

安装了如下的gst的插件：

gstreamer0.10-tools

gstreamer0.10-x

gstreamer0.10-plugins-base

gstreamer0.10-plugins-good

gstreamer0.10-plugins-ugly

gstreamer0.10-plugins-bad

gstreamer0.10-ffmpeg

gstreamer0.10-alsa

gstreamer0.10-schroedinger

gstreamer0.10-pulseaudio

有可能需要安装的软件：

sudo apt-get install bison

sudo apt-get install flex

sudo apt-get install zlib1g

mad解码插件

apt-get install libmad0-dev

apt-get install gstreamer0.10-plugins-ugly

Initializing GStreamer

#include <stdio.h>
#include <gst/gst.h>

int main (int   argc,   char *argv[])
{
  const gchar *nano_str;
  guint major, minor, micro, nano;

  gst_init (&argc, &argv);

  gst_version (&major, &minor, µ, &nano);

  if (nano == 1)
    nano_str = "(CVS)";
  else if (nano == 2)
    nano_str = "(Prerelease)";
  else
    nano_str = "";

  printf ("This program is linked against GStreamer %d.%d.%d %s\n",
          major, minor, micro, nano_str);

  return 0;
}

#include <gst/gst.h>
#include <glib.h>
//定义消息处理函数,
static gboolean bus_call(GstBus *bus,GstMessage *msg,gpointer data)
{
    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))
    {
        case GST_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 <mp3 filename>\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,stopping playback\n");
    gst_element_set_state(pipeline,GST_STATE_NULL);
    gst_object_unref(GST_OBJECT(pipeline));
    return 0;
}

编译运行

gcc -Wall test2.c -o test2  $(pkg-config --cflags --libs gstreamer-0.10)
（注意！！！很多地方写的这条命令 ：gcc -Wall $(pkg-config --cflags --libs gstreamer-0.10) -g test2.c -o test2 ，根本编译不过！）

./test2  ./abc.mp3

播放视频：

Ubuntu 12.04

gst-launch-0.10 filesrc location=/tmp/video_stream_pipe ! decodebin ! ffmpegcolorspace ! videoscale ! ximagesink sync=false

Ubuntu 13.10

gst-launch-1.0 filesrc location=/tmp/video_stream_pipe ! decodebin ! videoconvert ! xvimagesink sync=false
gst-launch-1.0 filesrc location=/tmp/video_stream_pipe ! decodebin ! videoconvert ! ximagesink sync=false