基于GStreamer编写Mp3播放器

一、简介

作者系统为CentOS6，本文在此基础上对Mp3播放器进行开发，需要使用mp3解码库libmad和gstreamer0.10-plugins-ugly，详细步骤如下。

二、操作步骤

1）下载

wget ftp://ftp.pbone.net/mirror/atrpms.net/el5-x86_64/atrpms/stable/libmad0-0.15.1b-4.el5.x86_64.rpm

wget ftp://ftp.pbone.net/mirror/atrpms.net/el5-x86_64/atrpms/stable/libmad-0.15.1b-4.el5.x86_64.rpm

wget ftp://195.220.108.108/linux/centos/6.7/os/x86_64/Packages/libid3tag-0.15.1b-11.el6.x86_64.rpm

wget ftp://ftp.pbone.net/mirror/atrpms.net/el6-x86_64/atrpms/stable/libdvdread3-0.9.7-5.el6.x86_64.rpm

wget ftp://195.220.108.108/linux/Mandriva/official/2007.0/x86_64/media/main/release/gstreamer0.10-plugins-ugly-0.10.4-1mdv2007.0.x86_64.rpm

2）安装

yum install gstreamer-devel

rpm -ivh libmad0-0.15.1b-4.el5.x86_64.rpm libmad-0.15.1b-4.el5.x86_64.rpm

rpm -ivh libid3tag-0.15.1b-11.el6.x86_64.rpm libdvdread3-0.9.7-5.el6.x86_64.rpm

rpm -ivh gstreamer0.10-plugins-ugly-0.10.4-1mdv2007.0.x86_64.rpm

三、源码

/**

 * http://files.cnblogs.com/files/274914765qq/mp3.zip

*/

#include <gst/gst.h>

#include <glib.h>

//消息处理函数

static gboolean bus_call(GstBus * bus, GstMessage * msg, gpointer data)

{

    GMainLoop *loop = (GMainLoop *) data;

    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 \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

gcc -Wall -g -o mp3 mp3.c `pkg-config --cflags --libs gstreamer-0.10`

运行

./mp3 xxx.mp3

参考：http://blog.chinaunix.net/uid-25885064-id-3450774.html

巴特西

基于GStreamer编写Mp3播放器

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