Playing Audio files with GTK and c++ - c++

Question

i'm currently building a very simple music player with the gtk+ and c++ code but now i am unable to figure out how to open and play the audio file using C++ code.
#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;
}
so as you can see i have created the open button to select your files and i know the dialog code;
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);
but my problem is i do not know how to place the code, i should more than likely create a function and set a callback to that function when the open buttot is clicked. right? And then the second problem coes no matter how hard i search i can't seem to find how to play the audio file, thanks so much in advance!

Answer 1

If you don't mind using external libraries Allegro makes it incredibly easy to play Audio files in a variety of formats. Here is an example of how to play a .wav audio file.
#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;
}

Answer 2

I know I'm incredibly late, but here's my proposal: Use the Gtk4 MediaStream API with Gtk::MediaFile.
Here's a minimal example:
#include <gtkmm.h>
int main(int argc, char ** argv)
{
auto app = Gtk::Application::create();
Gtk::Window w;
Glib::RefPtr<Gtk::MediaFile> mediafile = Gtk::MediaFile::create_for_filename("example.ogg");
mediafile->play();
return app->make_window_and_run<MyWindow>(argc, argv);
}
Compile with:
g++ example.cpp -o example `pkg-config gtkmm-4.0 --libs --cflags`