一個基於Gstreamer的Linux下的簡單媒體播放器

還是基於Gstreamer的，在Linux下的比較簡單的媒體播放器，

代碼如下：

main.c

/**main.c *Simple media player based on Gstreamer and GTK*/#include <gst/gst.h>#include <gdk/gdkx.h>#include <gtk/gtk.h>#include <gst/interfaces/xoverlay.h>#include <string.h>#include "main.h"static GtkWidget *main_window;static GtkWidget *play_button;static GtkWidget *pause_button;static GtkWidget *stop_button;static GtkWidget *status_label;static GtkWidget *time_label;static GtkWidget *seek_scale;static GtkWidget *video_output;static gpointer window;static GstElement *play = NULL;static GstElement *bin;static guint timeout_source = 0;static char *current_filename = NULL;gboolean no_seek = FALSE;// 開啟檔案static void file_open(GtkAction *action){    GtkWidget *file_chooser = gtk_file_chooser_dialog_new(        "Open File", GTK_WINDOW(main_window),        GTK_FILE_CHOOSER_ACTION_OPEN,        GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,        GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,        NULL);    if (gtk_dialog_run(GTK_DIALOG(file_chooser)) == GTK_RESPONSE_ACCEPT) {        char *filename;        filename = gtk_file_chooser_get_uri(GTK_FILE_CHOOSER(file_chooser));        // g_signal_emit_by_name(G_OBJECT(stop_button), "clicked");        if (current_filename) g_free(current_filename);        current_filename = filename;        if (load_file(filename))            gtk_widget_set_sensitive(GTK_WIDGET(play_button), TRUE);    }    gtk_widget_destroy(file_chooser);}// 退出static void file_quit(GtkAction *action){    gtk_main_quit();}// 關於static void help_about(GtkAction *action){    GtkWidget *about_dialog = gtk_about_dialog_new();    gtk_about_dialog_set_name(GTK_ABOUT_DIALOG(about_dialog), "MediaPlayer");    gtk_about_dialog_set_version(GTK_ABOUT_DIALOG(about_dialog), "0.0.0");    gtk_about_dialog_set_copyright(GTK_ABOUT_DIALOG(about_dialog), "Copyright @ 2011, Figo");    gtk_dialog_run(GTK_DIALOG(about_dialog));    gtk_widget_destroy(about_dialog);}static GtkActionEntry mainwindow_action_entries[] = {    { "FileMenu", "NULL", "檔案" },    {        "OpenFile",        GTK_STOCK_OPEN,        "開啟(O)",        "<control>O",        "Open a file for playback",        G_CALLBACK(file_open)    },    {        "QuitPlayer",        GTK_STOCK_QUIT,        "退出(Q)",        "<control>Q",        "Quit the media player",        G_CALLBACK(file_quit)    },      { "HelpMenu", "NULL", "協助" },    {        "HelpAbout",        GTK_STOCK_ABOUT,        "關於",        "",        "About the media player",        G_CALLBACK(help_about)    }};static void play_clicked(GtkWidget *widget, gpointer data){    if (current_filename) {        if (play_file()) {            gtk_widget_set_sensitive(GTK_WIDGET(stop_button), TRUE);            gtk_widget_set_sensitive(GTK_WIDGET(pause_button), TRUE);            // g_print("Play was pressed\n");      gui_status_update(STATE_PLAY);    g_print("Play\n");          }        else {            g_print("Failed to play\n");        }    }}static void pause_clicked(GtkWidget *widget, gpointer data){             if(gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget)))    {gst_element_set_state(play,GST_STATE_PAUSED);GstStateChangeReturn statechange;statechange = gst_element_set_state(play, GST_STATE_PAUSED);gui_status_update(STATE_PAUSE);g_print("Pause\n");// g_print("Pause was pressed\n");    }    else    {// g_print("Pause was pressed\n");gst_element_set_state(play,GST_STATE_PLAYING);gui_status_update(STATE_PLAY);g_print("Resume to play\n");    }              }static void stop_clicked(GtkWidget *widget, gpointer data){          if (timeout_source)        g_source_remove(timeout_source);    timeout_source = 0;     // g_print("Stop was pressed\n");      gst_element_set_state(play,GST_STATE_NULL);// gst_object_unref(GST_OBJECT(play));//不用銷毀管道gui_status_update(STATE_STOP);    g_print("Deleting pipeline\n");    g_print("Stop\n");    }/* Handler for user moving seek bar */static void seek_value_changed(GtkRange *range, gpointer data){    if (no_seek)     return;        gdouble val = gtk_range_get_value(range);    seek_to(val);}GtkWidget *build_gui(){    GtkWidget *main_vbox;    GtkWidget *status_hbox;    GtkWidget *controls_hbox;    GtkWidget *saturation_controls_hbox;    GtkActionGroup *actiongroup;    GtkUIManager *ui_manager;    actiongroup = gtk_action_group_new("MainwindowActiongroup");    gtk_action_group_add_actions(actiongroup,        mainwindow_action_entries,        G_N_ELEMENTS(mainwindow_action_entries),        NULL);    ui_manager = gtk_ui_manager_new();    gtk_ui_manager_insert_action_group(ui_manager, actiongroup, 0);    gtk_ui_manager_add_ui_from_string(        ui_manager,        "<ui>"        "    <menubar name='MainMenu'>"        "        <menu action='FileMenu'>"        "            <menuitem action='OpenFile'/>"        "            <separator name='fsep1'/>"        "            <menuitem action='QuitPlayer'/>"        "        </menu>"        "        <menu action='HelpMenu'>"        "            <menuitem action='HelpAbout'/>"        "        </menu>"               "    </menubar>"        "</ui>",        -1,        NULL);        // 建立主 GtkVBOx. 其他所有都在它裡面    // 0：各個構件高度可能不同，6：構件之間的間距為6 像素    main_vbox = gtk_vbox_new(0, 0);    // 添加功能表列    gtk_box_pack_start(        GTK_BOX(main_vbox),        gtk_ui_manager_get_widget(ui_manager, "/ui/MainMenu"),        FALSE, FALSE, 0);/*// 視頻顯示地區    video_output = gtk_drawing_area_new ();    gtk_box_pack_start (GTK_BOX (main_vbox), video_output, TRUE, TRUE, 0);    //gtk_widget_set_size_request (video_output, 0x200, 0x100);    gtk_widget_set_size_request (video_output, 672, 378);    gtk_widget_show (video_output);    */       // 滑動條控制    seek_scale = gtk_hscale_new_with_range(0, 100, 1);    gtk_scale_set_draw_value(GTK_SCALE(seek_scale), FALSE);    gtk_range_set_update_policy(GTK_RANGE(seek_scale), GTK_UPDATE_DISCONTINUOUS);    g_signal_connect(G_OBJECT(seek_scale), "value-changed", G_CALLBACK(seek_value_changed), NULL);    gtk_box_pack_start(GTK_BOX(main_vbox), seek_scale, FALSE, FALSE, 0);    // controls_hbox    controls_hbox = gtk_hbox_new(TRUE, 6);    gtk_box_pack_start_defaults(GTK_BOX(main_vbox), controls_hbox);    // 播放按鈕    play_button = gtk_button_new_from_stock(GTK_STOCK_MEDIA_PLAY);    // 設定“敏感”屬性，FALSE 表示為灰色，不響應滑鼠鍵盤事件    gtk_widget_set_sensitive(play_button, FALSE);    g_signal_connect(G_OBJECT(play_button), "clicked", G_CALLBACK(play_clicked), NULL);    gtk_box_pack_start_defaults(GTK_BOX(controls_hbox), play_button);        // 暫停按鈕,為使按下時停留在按下狀態，使用GtkToggleButton    pause_button = gtk_toggle_button_new_with_label(GTK_STOCK_MEDIA_PAUSE);    // 將按鈕設定為固化按鈕    gtk_button_set_use_stock(GTK_BUTTON(pause_button), TRUE);    gtk_widget_set_sensitive(pause_button, FALSE);    g_signal_connect(G_OBJECT(pause_button), "clicked", G_CALLBACK(pause_clicked), NULL);    gtk_box_pack_start_defaults(GTK_BOX(controls_hbox), pause_button);    // 停止按鈕    stop_button = gtk_button_new_from_stock(GTK_STOCK_MEDIA_STOP);    gtk_widget_set_sensitive(stop_button, FALSE);    g_signal_connect(G_OBJECT(stop_button), "clicked", G_CALLBACK(stop_clicked), NULL);    gtk_box_pack_start_defaults(GTK_BOX(controls_hbox), stop_button);             // status_hbox    status_hbox = gtk_hbox_new(TRUE, 0);    gtk_box_pack_start(GTK_BOX(main_vbox), status_hbox, FALSE, FALSE, 0);    // 狀態標籤    status_label = gtk_label_new("<b>已停止</b>");    gtk_label_set_use_markup(GTK_LABEL(status_label), TRUE);    gtk_misc_set_alignment(GTK_MISC(status_label), 0.0, 0.5);    gtk_box_pack_start(GTK_BOX(status_hbox), status_label, TRUE, TRUE, 0);    // 時間標籤       time_label = gtk_label_new("00:00:00");    gtk_misc_set_alignment(GTK_MISC(time_label), 0.5, 1.0);    gtk_box_pack_start(GTK_BOX(status_hbox), time_label, TRUE, TRUE, 0);       return main_vbox;}/*void stop_playback(){    if (timeout_source)        g_source_remove(timeout_source);    timeout_source = 0;    if (play) {        gst_element_set_state(play, GST_STATE_NULL);        gst_object_unref(GST_OBJECT(play));        play = NULL;    }    gui_status_update(STATE_STOP);}*/// destory main windowstatic void destroy(GtkWidget *widget, gpointer data){    gtk_main_quit();}// 更新播放時間void gui_update_time(const gchar *time, const gint64 position, const gint64 length){    gtk_label_set_text(GTK_LABEL(time_label), time);    if (length > 0) {        no_seek = TRUE;        gtk_range_set_value(GTK_RANGE(seek_scale), ((gdouble)position / (gdouble)length) * 100.0);        no_seek = FALSE;    }}// 更新播放狀態void gui_status_update(PlayerState state){    switch (state) {        case STATE_STOP:            gtk_widget_set_sensitive(GTK_WIDGET(stop_button), FALSE);            gtk_widget_set_sensitive(GTK_WIDGET(pause_button), FALSE);                       gtk_label_set_markup(GTK_LABEL(status_label), "<b>已停止</b>");            gtk_range_set_value(GTK_RANGE(seek_scale), 0.0);                  gtk_label_set_text(GTK_LABEL(time_label), "00:00:00");            break;        case STATE_PLAY:            gtk_widget_set_sensitive(GTK_WIDGET(stop_button), TRUE);            gtk_widget_set_sensitive(GTK_WIDGET(pause_button), TRUE);                        gtk_label_set_markup(GTK_LABEL(status_label), "<b>播放中</b>");            break;        case STATE_PAUSE:                       gtk_label_set_markup(GTK_LABEL(status_label), "<b>已暫停</b>");            break;        default:            break;    }}static gboolean bus_callback(GstBus *bus, GstMessage *message, gpointer data){    switch (GST_MESSAGE_TYPE(message)) {        case GST_MESSAGE_ERROR:        {            GError *err;            gchar *debug;                gst_message_parse_error(message, &err, &debug);            g_print("Error: %s\n", err->message);            g_error_free(err);            g_free(debug);                gtk_main_quit();            break;        }        case GST_MESSAGE_EOS:            g_print("End of stream\n");            // stop_playback();            // stop_clicked(GtkWidget *widget, gpointer data);            if (timeout_source)        g_source_remove(timeout_source);    timeout_source = 0;gst_element_set_state(play, GST_STATE_NULL);               gui_status_update(STATE_STOP);            break;                default:            break;    }    return TRUE;}static gboolean build_gstreamer_pipeline(const gchar *uri){    // 建立一個playbin 元素     play = gst_pipeline_new ("Mediaplayer");    bin  = gst_element_factory_make ("playbin", "bin");        gst_bin_add (GST_BIN (play), bin);    {        GstBus *bus;        bus = gst_pipeline_get_bus (GST_PIPELINE (play));        gst_bus_add_watch (bus, bus_callback, NULL);        gst_object_unref (bus);    }    g_object_set (G_OBJECT (bin), "uri", uri, NULL);    return TRUE;}// load file to playgboolean load_file(const gchar *uri){    if (build_gstreamer_pipeline(uri))        return TRUE;    return FALSE;}static gboolean update_time_callback(GstElement *pipeline){    GstFormat fmt = GST_FORMAT_TIME;    gint64 position;    gint64 length;    gchar time_buffer[25];    if (gst_element_query_position(pipeline, &fmt, &position)        && gst_element_query_duration(pipeline, &fmt, &length)) {        g_snprintf(time_buffer, 24, "%u:%02u:%02u", GST_TIME_ARGS(position));        gui_update_time(time_buffer, position, length);    }    return TRUE;}gboolean play_file(){    if (play) {        /* Start playing */        gst_element_set_state(play, GST_STATE_PLAYING);        gui_status_update(STATE_PLAY);        /* Connect a callback to trigger every 200 milliseconds to         * update the GUI with the playback progress. We remember         * the ID of this source so that we can remove it when we stop         * playing */        timeout_source = g_timeout_add(200, (GSourceFunc)update_time_callback, play);        return TRUE;    }    return FALSE;}/* Attempt to seek to the given percentage through the file */void seek_to(gdouble percentage){    GstFormat fmt = GST_FORMAT_TIME;    gint64 length;    /* If it seems safe to attempt a seek... */    if (play && gst_element_query_duration(play, &fmt, &length)) {        /* ...calculate where to seek to */        gint64 target = ((gdouble)length * (percentage / 100.0));        /* ...and attempt the seek */        if (!gst_element_seek(play, 1.0, GST_FORMAT_TIME,            GST_SEEK_FLAG_FLUSH, GST_SEEK_TYPE_SET,            target, GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE))        g_print("Failed to seek to desired position\n");    }}int main(int argc, char *argv[]){    // 初始化 GTK+    gtk_init(&argc, &argv);    gst_init(&argc, &argv);    // 建立視窗    main_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);    // 設定視窗標題    gtk_window_set_title(GTK_WINDOW(main_window), "MediaPlayer");    // 主視窗銷毀控制代碼    g_signal_connect(G_OBJECT(main_window), "destroy", G_CALLBACK(destroy), NULL);    // 建立主視窗GUI    gtk_container_add(GTK_CONTAINER(main_window), build_gui());    // 顯示    gtk_widget_show_all(GTK_WIDGET(main_window));    // 開始主迴圈    gtk_main();    return 0;}

main.h

/* * main.h */#ifndef MAIN_H#define MAIN_H#include <gtk/gtk.h>typedef enum {    STATE_STOP,    STATE_PLAY,    STATE_PAUSE} PlayerState;void gui_status_update(PlayerState state);void gui_update_time(const gchar *time, const gint64 position, const gint64 length);// void gui_update_metadata(const gchar *title, const gchar *artist);gboolean load_file(const gchar *uri);void seek_to(gdouble percentage);#endif

MakiFile

CFLAGS=`pkg-config --cflags gtk+-2.0 gstreamer-0.10`LIBS=`pkg-config --libs gtk+-2.0 gstreamer-0.10`all: playerplayer: gcc -o MediaPlayer main.c main.h $(LIBS) $(CFLAGS) -l gstinterfaces-0.10clean:rm *.o player

編譯，終端裡輸入：

make

產生可執行檔，運行：

./MediaPlayer 

運行介面：