使用 GTK 和 c++ 播放音频文件

我目前正在使用 gtk+ 和 C++ 代码构建一个非常简单的音乐播放器，但现在我无法弄清楚如何使用 C++ 代码打开和播放音频文件。

#include <gtk/gtk.h>
// simple music player to practice gtk and c++//

int main(int argc, char* argv[])
{
gtk_init(&argc,&argv);

GtkWidget *window;
GtkWidget *playButton;
GtkWidget *fileButton;
GtkWidget *frame;
GtkWidget *Dialog;


window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window),GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 400, 400);

frame = gtk_fixed_new();
gtk_container_add(GTK_CONTAINER(window), frame);

playButton = gtk_button_new_with_label("Play");
gtk_widget_set_size_request(playButton,80,40);
gtk_fixed_put(GTK_FIXED(frame),playButton,40,330);

fileButton = gtk_button_new_with_label("Open");
gtk_widget_set_size_request(fileButton,80,40);
gtk_fixed_put(GTK_FIXED(frame),fileButton,40,260);

gtk_widget_show_all(window);
gtk_main();

return 0;
}

如您所见，我创建了打开按钮来选择您的文件，并且我知道对话框代码；

GtkWidget *dialog;

dialog = gtk_file_chooser_dialog_new ("OpenFile",parent_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 (dialog)) == GTK_RESPONSE_ACCEPT)
  {
    char *filename;

    filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (dialog));
    open_file (filename);
   g_free (filename);
 }

gtk_widget_destroy (dialog);

但我的问题是我不知道如何放置代码，我很可能应该创建一个函数并在单击打开按钮时设置对该函数的回调。正确的？然后第二个问题是，无论我如何努力搜索，我似乎都找不到如何播放音频文件，非常感谢！

如果您不介意使用外部库Allegro http://alleg.sourceforge.net/使播放各种格式的音频文件变得异常容易。以下是如何播放 .wav 音频文件的示例。

#include <stdio.h>
#include <allegro5/allegro.h>
#include <allegro5/allegro_audio.h>
#include <allegro5/allegro_acodec.h>

int main(int argc, char **argv){

   ALLEGRO_DISPLAY *display = NULL;
   ALLEGRO_SAMPLE *sample=NULL;

   if(!al_init()){
      fprintf(stderr, "failed to initialize allegro!\n");
      return -1;
   }

   if(!al_install_audio()){
      fprintf(stderr, "failed to initialize audio!\n");
      return -1;
   }

   if(!al_init_acodec_addon()){
      fprintf(stderr, "failed to initialize audio codecs!\n");
      return -1;
   }

   if (!al_reserve_samples(1)){
      fprintf(stderr, "failed to reserve samples!\n");
      return -1;
   }

   sample = al_load_sample( "footstep.wav" );

   if (!sample){
      printf( "Audio clip sample not loaded!\n" ); 
      return -1;
   }

   display = al_create_display(640, 480);

   if(!display){
      fprintf(stderr, "failed to create display!\n");
      return -1;
   }

   /* Loop the sample until the display closes. */
   al_play_sample(sample, 1.0, 0.0,1.0,ALLEGRO_PLAYMODE_LOOP,NULL);

   al_rest(10.0);

   al_destroy_display(display);
   al_destroy_sample(sample);
   return 0;
}