一个基于Gstreamer的Linux下的简单媒体播放器
来源：互联网 发布：淘宝一年交易额怎么看 编辑：程序博客网 时间：2024/06/09 20:11
还是基于Gstreamer的，在Linux下的比较简单的媒体播放器，
代码如下：
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;// 打开文件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();}// 关于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", "文件" }, { "OpenFile", GTK_STOCK_OPEN, "打开(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", "帮助" }, { "HelpAbout", GTK_STOCK_ABOUT, "关于", "", "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));//不用销毁管道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); // 创建主 GtkVBOx. 其他所有都在它里面 // 0：各个构件高度可能不同，6：构件之间的间距为6 像素 main_vbox = gtk_vbox_new(0, 0); // 添加菜单栏 gtk_box_pack_start( GTK_BOX(main_vbox), gtk_ui_manager_get_widget(ui_manager, "/ui/MainMenu"), FALSE, FALSE, 0);/*// 视频显示区域 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); */ // 滑动条控制 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); // 播放按钮 play_button = gtk_button_new_from_stock(GTK_STOCK_MEDIA_PLAY); // 设置“敏感”属性，FALSE 表示为灰色，不响应鼠标键盘事件 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); // 暂停按钮,为使按下时停留在按下状态，使用GtkToggleButton pause_button = gtk_toggle_button_new_with_label(GTK_STOCK_MEDIA_PAUSE); // 将按钮设置为固化按钮 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); // 停止按钮 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); // 状态标签 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); // 时间标签 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();}// 更新播放时间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; }}// 更新播放状态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>已暂停</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){ // 创建一个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); // 创建窗口 main_window = gtk_window_new(GTK_WINDOW_TOPLEVEL); // 设置窗口标题 gtk_window_set_title(GTK_WINDOW(main_window), "MediaPlayer"); // 主窗口销毁句柄 g_signal_connect(G_OBJECT(main_window), "destroy", G_CALLBACK(destroy), NULL); // 创建主窗口GUI gtk_container_add(GTK_CONTAINER(main_window), build_gui()); // 显示 gtk_widget_show_all(GTK_WIDGET(main_window)); // 开始主循环 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);#endifMakiFileCFLAGS=`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
编译，终端里输入：
make生成可执行文件，运行：
./MediaPlayer运行界面：
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