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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，

相關閱讀：基於Gstreamer和Gtk的一個簡單的MP3播放器 http://www.linuxidc.com/Linux/2012-02/54982.htm

代碼如下：

main.c

[cpp]

/*
*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;
// 打開文件
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();
}
// 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", "文件" },
{
"OpenFile",
GTK_STOCK_OPEN,
"打開(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", "幫助" },
{
"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);
// 創建主 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);
// 添加菜單欄
gtk_box_pack_start(
GTK_BOX(main_vbox),
gtk_ui_manager_get_widget(ui_manager, "/ui/MainMenu"),
FALSE, FALSE, 0);
/*
// 視頻顯示區域
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);
// 設置“敏感”屬性，FALSE 表示為灰色，不響應鼠標鍵盤事件
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);
// 將按鈕設置為固化按鈕
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);
// 狀態標簽
status_label = gtk_label_new("已停止");
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);
// 時間標簽
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 window
static 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), "已停止");
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), "播放中");
break;
case STATE_PAUSE:
gtk_label_set_markup(GTK_LABEL(status_label), "已暫停");
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)
{
// 創建一個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 play
gboolean 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);
// 創建窗口
main_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
// 設置窗口標題
gtk_window_set_title(GTK_WINDOW(main_window), "MediaPlayer");
// 主窗口銷毀句柄
g_signal_connect(G_OBJECT(main_window), "destroy", G_CALLBACK(destroy), NULL);
// 創建主窗口GUI
gtk_container_add(GTK_CONTAINER(main_window), build_gui());
// 顯示
gtk_widget_show_all(GTK_WIDGET(main_window));
// 開始主循環
gtk_main();
return 0;
}

main.h

[cpp]

/*
* 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