Linux基于Gstreamer的傻瓜组装式mp3播放

来源：互联网发布：java action servlet 编辑：程序博客网时间：2024/04/30 01:33

#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;    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); //等同于callback处理函数    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;}

$ gcc -Wall $(pkg-config --cflags --libs gstreamer-0.10) test.c -o test `pkg-config --libs glib-2.0` `pkg-config --libs gstreamer-0.10`

$ ./test test.mp3