一、簡介
作者系統為CentOS6,本文在此基礎上對Mp3播放器進行開發,需要使用mp3解碼庫libmad和gstreamer0.10-plugins-ugly,詳細步驟如下。
二、操作步驟
1)下載
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)安裝
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、源碼
/**
* http://files.cnblogs.com/files/274914765qq/mp3.zip
*/
#include <gst/gst.h> #include <glib.h> //消息處理函數 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; //定義組件 GstBus *bus; gst_init(&argc, &argv); loop = g_main_loop_new(NULL, FALSE); //創建主循環,在執行 g_main_loop_run後正式開始循環 if (argc != 2) { g_printerr("Usage:%s \n", argv[0]); return -1; } //創建管道和組件 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; } //設置source的location參數,即文件地址 g_object_set(G_OBJECT(source), "location", argv[1], NULL); //得到管道的消息總線 bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline)); //添加消息監視器 gst_bus_add_watch(bus, bus_call, loop); gst_object_unref(bus); //把組件添加到管道中.管道是一個特殊的組件,可以更好的讓數據流動 gst_bin_add_many(GST_BIN(pipeline), source, decoder, sink, NULL); //依次連接組件 gst_element_link_many(source, decoder, sink, NULL); //開始播放 gst_element_set_state(pipeline, GST_STATE_PLAYING); g_print("Running\n"); //開始循環 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; }
編譯
gcc -Wall -g -o mp3 mp3.c `pkg-config --cflags --libs gstreamer-0.10`
運行
./mp3 xxx.mp3
參考:http://blog.chinaunix.net/uid-25885064-id-3450774.html