gstreamer/examples/seeking/cdplayer.c

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#include <stdlib.h>
#include <glib.h>
#include <gtk/gtk.h>
#include <gst/gst.h>
#include <string.h>
static GList *seekable_elements = NULL;
static GstElement *pipeline;
static GtkAdjustment *adjustment;
static gboolean stats = FALSE;
static guint64 duration;
static guint update_id;
#define UPDATE_INTERVAL 500
static GstElement*
make_cdaudio_pipeline (void)
{
GstElement *cdaudio;
cdaudio = gst_element_factory_make ("cdaudio", "cdaudio");
g_assert (cdaudio != NULL);
seekable_elements = g_list_prepend (seekable_elements, cdaudio);
return cdaudio;
}
static gchar*
format_value (GtkScale *scale,
gdouble value)
{
gint64 real;
gint64 seconds;
gint64 subseconds;
real = value * duration / 100;
seconds = (gint64) real / GST_SECOND;
subseconds = (gint64) real / (GST_SECOND / 100);
return g_strdup_printf ("%02lld:%02lld:%02lld",
seconds/60,
seconds%60,
subseconds%100);
}
typedef struct
{
const gchar *name;
const GstFormat format;
} seek_format;
static seek_format seek_formats[] =
{
{ "tim", GST_FORMAT_TIME },
{ "byt", GST_FORMAT_BYTES },
{ "unt", GST_FORMAT_UNITS },
{ "buf", GST_FORMAT_BUFFERS },
{ "def", GST_FORMAT_DEFAULT },
{ NULL, 0 },
};
G_GNUC_UNUSED static void
query_durations ()
{
GList *walk = seekable_elements;
while (walk) {
GstElement *element = GST_ELEMENT (walk->data);
gint i = 0;
g_print ("durations %8.8s: ", GST_ELEMENT_NAME (element));
while (seek_formats[i].name) {
gboolean res;
gint64 value;
GstFormat format;
format = seek_formats[i].format;
res = gst_element_query (element, GST_QUERY_TOTAL, &format, &value);
if (res) {
g_print ("%s %13lld | ", seek_formats[i].name, value);
}
else {
g_print ("%s %13.13s | ", seek_formats[i].name, "*NA*");
}
i++;
}
g_print (" %s\n", GST_ELEMENT_NAME (element));
walk = g_list_next (walk);
}
}
G_GNUC_UNUSED static void
query_positions ()
{
GList *walk = seekable_elements;
while (walk) {
GstElement *element = GST_ELEMENT (walk->data);
gint i = 0;
g_print ("positions %8.8s: ", GST_ELEMENT_NAME (element));
while (seek_formats[i].name) {
gboolean res;
gint64 value;
GstFormat format;
format = seek_formats[i].format;
res = gst_element_query (element, GST_QUERY_POSITION, &format, &value);
if (res) {
g_print ("%s %13lld | ", seek_formats[i].name, value);
}
else {
g_print ("%s %13.13s | ", seek_formats[i].name, "*NA*");
}
i++;
}
g_print (" %s\n", GST_ELEMENT_NAME (element));
walk = g_list_next (walk);
}
}
static gboolean
update_scale (gpointer data)
{
GstClock *clock;
guint64 position = 0;
GstFormat format = GST_FORMAT_TIME;
duration = 0;
clock = gst_bin_get_clock (GST_BIN (pipeline));
if (seekable_elements) {
GstElement *element = GST_ELEMENT (seekable_elements->data);
gst_element_query (element, GST_QUERY_TOTAL, &format, &duration);
}
if (clock)
position = gst_clock_get_time (clock);
if (stats) {
if (clock)
g_print ("clock: %13llu (%s)\n", position, gst_object_get_name (GST_OBJECT (clock)));
query_durations ();
query_positions ();
}
if (duration > 0) {
gtk_adjustment_set_value (adjustment, position * 100.0 / duration);
}
return TRUE;
}
static gboolean
iterate (gpointer data)
{
gboolean res = TRUE;
g_print ("iterate\n");
res = gst_bin_iterate (GST_BIN (data));
if (!res) {
gtk_timeout_remove (update_id);
g_print ("stopping iterations\n");
}
return res;
}
static gboolean
start_seek (GtkWidget *widget, GdkEventButton *event, gpointer user_data)
{
gst_element_set_state (pipeline, GST_STATE_PAUSED);
gtk_timeout_remove (update_id);
return FALSE;
}
static gboolean
stop_seek (GtkWidget *widget, GdkEventButton *event, gpointer user_data)
{
gint64 real = gtk_range_get_value (GTK_RANGE (widget)) * duration / 100;
gboolean res;
GstEvent *s_event;
GList *walk = seekable_elements;
while (walk) {
GstElement *seekable = GST_ELEMENT (walk->data);
g_print ("seek to %lld on element %s\n", real, GST_ELEMENT_NAME (seekable));
s_event = gst_event_new_seek (GST_FORMAT_TIME |
GST_SEEK_METHOD_SET |
GST_SEEK_FLAG_FLUSH, real);
res = gst_element_send_event (seekable, s_event);
walk = g_list_next (walk);
}
gst_element_set_state (pipeline, GST_STATE_PLAYING);
if (!GST_FLAG_IS_SET (pipeline, GST_BIN_SELF_SCHEDULABLE))
gtk_idle_add ((GtkFunction) iterate, pipeline);
update_id = gtk_timeout_add (UPDATE_INTERVAL, (GtkFunction) update_scale, pipeline);
return FALSE;
}
static void
play_cb (GtkButton * button, gpointer data)
{
if (gst_element_get_state (pipeline) != GST_STATE_PLAYING) {
gst_element_set_state (pipeline, GST_STATE_PLAYING);
if (!GST_FLAG_IS_SET (pipeline, GST_BIN_SELF_SCHEDULABLE))
gtk_idle_add ((GtkFunction) iterate, pipeline);
update_id = gtk_timeout_add (UPDATE_INTERVAL, (GtkFunction) update_scale, pipeline);
}
}
static void
pause_cb (GtkButton * button, gpointer data)
{
if (gst_element_get_state (pipeline) != GST_STATE_PAUSED) {
gst_element_set_state (pipeline, GST_STATE_PAUSED);
gtk_timeout_remove (update_id);
}
}
static void
stop_cb (GtkButton * button, gpointer data)
{
if (gst_element_get_state (pipeline) != GST_STATE_READY) {
gst_element_set_state (pipeline, GST_STATE_READY);
gtk_timeout_remove (update_id);
}
}
int
main (int argc, char **argv)
{
GtkWidget *window, *hbox, *vbox,
*play_button, *pause_button, *stop_button,
*hscale;
struct poptOption options[] = {
{"stats", 's', POPT_ARG_NONE|POPT_ARGFLAG_STRIP, &stats, 0,
"Show element stats", NULL},
POPT_TABLEEND
};
gst_init_with_popt_table (&argc, &argv, options);
gtk_init (&argc, &argv);
pipeline = make_cdaudio_pipeline ();
g_signal_connect (pipeline, "deep_notify", G_CALLBACK (gst_element_default_deep_notify), NULL);
g_signal_connect (pipeline, "error", G_CALLBACK (gst_element_default_error), NULL);
/* initialize gui elements ... */
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
hbox = gtk_hbox_new (FALSE, 0);
vbox = gtk_vbox_new (FALSE, 0);
play_button = gtk_button_new_with_label ("play");
pause_button = gtk_button_new_with_label ("pause");
stop_button = gtk_button_new_with_label ("stop");
adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.00, 100.0, 0.1, 1.0, 1.0));
hscale = gtk_hscale_new (adjustment);
gtk_scale_set_digits (GTK_SCALE (hscale), 2);
gtk_range_set_update_policy (GTK_RANGE (hscale), GTK_UPDATE_CONTINUOUS);
gtk_signal_connect(GTK_OBJECT(hscale),
"button_press_event", G_CALLBACK (start_seek), pipeline);
gtk_signal_connect(GTK_OBJECT(hscale),
"button_release_event", G_CALLBACK (stop_seek), pipeline);
gtk_signal_connect(GTK_OBJECT(hscale),
"format_value", G_CALLBACK (format_value), pipeline);
/* do the packing stuff ... */
gtk_window_set_default_size (GTK_WINDOW (window), 96, 96);
gtk_container_add (GTK_CONTAINER (window), vbox);
gtk_container_add (GTK_CONTAINER (vbox), hbox);
gtk_box_pack_start (GTK_BOX (hbox), play_button, FALSE, FALSE, 2);
gtk_box_pack_start (GTK_BOX (hbox), pause_button, FALSE, FALSE, 2);
gtk_box_pack_start (GTK_BOX (hbox), stop_button, FALSE, FALSE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hscale, TRUE, TRUE, 2);
/* connect things ... */
g_signal_connect (G_OBJECT (play_button), "clicked", G_CALLBACK (play_cb), pipeline);
g_signal_connect (G_OBJECT (pause_button), "clicked", G_CALLBACK (pause_cb), pipeline);
g_signal_connect (G_OBJECT (stop_button), "clicked", G_CALLBACK (stop_cb), pipeline);
g_signal_connect (G_OBJECT (window), "delete_event", gtk_main_quit, NULL);
/* show the gui. */
gtk_widget_show_all (window);
gtk_main ();
gst_element_set_state (pipeline, GST_STATE_NULL);
return 0;
}