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#include <stdlib.h>
#include <glib.h>
#include <gtk/gtk.h>
#include <gst/gst.h>
#define NUM_BEATS 12
GtkWidget *window, *vbox, *beat_box, *button_box;
GtkWidget *play_button, *clear_button, *reset_button, *quit_button;
GtkWidget **beat_button;
GtkWidget *speed_scale;
GtkObject *speed_adj;
GstElement *src, *mad, *conv, *pod, *sink, *pipeline;
GstClock *element_clock;
guint32 *beats;
void
played (GstElement *pod, gpointer data)
{
gint i;
g_print("Played beat at %02u, beats are ",
(guint) (gst_clock_get_time(element_clock) / GST_SECOND *
(GTK_ADJUSTMENT(speed_adj))->value) % NUM_BEATS);
for (i = 0; i <= NUM_BEATS / 32; i++) g_print ("%08x ", beats[i]);
g_print("\n");
}
void
play (GtkButton *button, gpointer data)
{
g_signal_emit_by_name(G_OBJECT(pod), "play", NULL, NULL);
}
void
clear (GtkButton *button, gpointer data)
{
g_signal_emit_by_name(G_OBJECT(pod), "clear", NULL, NULL);
}
void
reset (GtkButton *button, gpointer data)
{
guint i;
g_signal_emit_by_name(G_OBJECT(pod), "reset", NULL, NULL);
for (i = 0; i < NUM_BEATS; i++)
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(beat_button[i]), 0);
}
void
beat (GtkToggleButton *button, gpointer data)
{
guint b = GPOINTER_TO_UINT(data);
if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(button)))
beats[b / 32] |= 1 << (b % 32);
else
beats[b / 32] &= ~ (1 << (b % 32));
}
void
speed (GtkAdjustment *adjustment, gpointer data)
{
g_signal_stop_emission_by_name(G_OBJECT(pod), "deep-notify");
g_object_set(G_OBJECT(pod), "tick-rate", adjustment->value, NULL);
/*gst_clock_set_speed(element_clock, adjustment->value);*/
}
void
setup_pipeline (gchar *filename)
{
src = gst_element_factory_make("filesrc", "filesrc");
mad = gst_element_factory_make("mad", "mad");
conv = gst_element_factory_make("audioconvert", "audioconvert");
pod = gst_element_factory_make("playondemand", "playondemand");
sink = gst_element_factory_make("alsasink", "alsasink");
g_object_set(G_OBJECT(src), "location", filename, NULL);
g_object_set(G_OBJECT(sink), "period-count", 64,
"period-size", 512, NULL);
g_object_set(G_OBJECT(pod), "total-ticks", NUM_BEATS,
"tick-rate", 1.0,
"max-plays", NUM_BEATS * 2, NULL);
g_object_get(G_OBJECT(pod), "ticks", &beats, NULL);
pipeline = gst_pipeline_new("app");
gst_bin_add_many(GST_BIN(pipeline), src, mad, conv, pod, sink, NULL);
gst_element_link_many(src, mad, conv, pod, sink, NULL);
element_clock = gst_bin_get_clock(GST_BIN(pipeline));
gst_element_set_clock(GST_ELEMENT(pod), element_clock);
}
void
setup_gui (void)
{
guint i;
beat_button = g_new(GtkWidget *, NUM_BEATS);
/* initialize gui elements ... */
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_container_set_border_width(GTK_CONTAINER(window), 12);
vbox = gtk_vbox_new(TRUE, 0);
gtk_box_set_spacing(GTK_BOX(vbox), 12);
beat_box = gtk_hbox_new(TRUE, 0);
button_box = gtk_hbox_new(TRUE, 0);
play_button = gtk_button_new_with_label("Play");
clear_button = gtk_button_new_with_label("Reset Sound");
reset_button = gtk_button_new_with_label("Reset All");
quit_button = gtk_button_new_with_label("Quit");
for (i = 0; i < NUM_BEATS; i++)
beat_button[i] = gtk_toggle_button_new_with_label(g_strdup_printf("%2d", i+1));
speed_adj = gtk_adjustment_new(1, 0.0, 10.0, 0.1, 1.0, 0.0);
speed_scale = gtk_hscale_new(GTK_ADJUSTMENT(speed_adj));
gtk_scale_set_digits(GTK_SCALE(speed_scale), 4);
gtk_range_set_update_policy(GTK_RANGE(speed_scale), GTK_UPDATE_DISCONTINUOUS);
/* do the packing stuff ... */
gtk_window_set_default_size(GTK_WINDOW(window), 96, 96);
gtk_container_add(GTK_CONTAINER(window), vbox);
gtk_box_pack_start(GTK_BOX(button_box), play_button, TRUE, TRUE, 2);
gtk_box_pack_start(GTK_BOX(button_box), clear_button, TRUE, TRUE, 2);
gtk_box_pack_start(GTK_BOX(button_box), reset_button, TRUE, TRUE, 2);
gtk_box_pack_start(GTK_BOX(button_box), quit_button, TRUE, TRUE, 2);
for (i = 0; i < NUM_BEATS; i++)
gtk_box_pack_start(GTK_BOX(beat_box), beat_button[i], TRUE, TRUE, 2);
gtk_box_pack_start(GTK_BOX(vbox), button_box, TRUE, FALSE, 2);
gtk_box_pack_start(GTK_BOX(vbox), beat_box, TRUE, FALSE, 2);
gtk_box_pack_start(GTK_BOX(vbox), speed_scale, TRUE, FALSE, 2);
/* connect things ... */
g_signal_connect(G_OBJECT(play_button), "clicked", G_CALLBACK(play), NULL);
g_signal_connect(G_OBJECT(clear_button), "clicked", G_CALLBACK(clear), NULL);
g_signal_connect(G_OBJECT(reset_button), "clicked", G_CALLBACK(reset), NULL);
g_signal_connect(G_OBJECT(quit_button), "clicked", gtk_main_quit, NULL);
g_signal_connect(G_OBJECT(pod), "played", G_CALLBACK(played), NULL);
g_signal_connect(G_OBJECT(speed_adj), "value_changed", G_CALLBACK(speed), NULL);
for (i = 0; i < NUM_BEATS; i++)
g_signal_connect(G_OBJECT(beat_button[i]), "toggled", G_CALLBACK(beat), GUINT_TO_POINTER(i));
/* show the gui. */
gtk_widget_show_all(window);
gtk_idle_add((GtkFunction)gst_bin_iterate, pipeline);
}
int
main(int argc, char **argv)
{
gst_init (&argc, &argv);
gtk_init (&argc, &argv);
if (argc!=2) {
g_print("usage: %s <mp3-filename>\n", argv[0]);
exit(-1);
}
setup_pipeline(argv[1]);
gst_element_set_state(pipeline, GST_STATE_PLAYING);
setup_gui();
gtk_main();
g_free(beat_button);
return 0;
}
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