316 lines
9.7 KiB
C
316 lines
9.7 KiB
C
|
/* Paintable/Media Stream
|
||
|
|
*
|
||
|
|
* GdkPaintable is also used by the GtkMediaStream class.
|
||
|
|
*
|
||
|
|
* This demo code turns the nuclear media_stream into the object
|
||
|
|
* GTK uses for videos. This allows treating the icon like a
|
||
|
|
* regular video, so we can for example attach controls to it.
|
||
|
|
*
|
||
|
|
* After all, what good is a media_stream if one cannot pause
|
||
|
|
* it.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <gtk/gtk.h>
|
||
|
|
|
||
|
|
#include "paintable.h"
|
||
|
|
|
||
|
|
static GtkWidget *window = NULL;
|
||
|
|
|
||
|
|
/* First, add the boilerplate for the object itself.
|
||
|
|
* This part would normally go in the header.
|
||
|
|
*/
|
||
|
|
#define GTK_TYPE_NUCLEAR_MEDIA_STREAM (gtk_nuclear_media_stream_get_type ())
|
||
|
|
G_DECLARE_FINAL_TYPE (GtkNuclearMediaStream, gtk_nuclear_media_stream, GTK, NUCLEAR_MEDIA_STREAM, GtkMediaStream)
|
||
|
|
|
||
|
|
/* Do a full rotation in 5 seconds.
|
||
|
|
*
|
||
|
|
* We do not save steps here but real timestamps.
|
||
|
|
* GtkMediaStream uses microseconds, so we will do so, too.
|
||
|
|
*/
|
||
|
|
#define DURATION (5 * G_USEC_PER_SEC)
|
||
|
|
|
||
|
|
/* Declare the struct. */
|
||
|
|
struct _GtkNuclearMediaStream
|
||
|
|
{
|
||
|
|
/* We now inherit from the media stream object. */
|
||
|
|
GtkMediaStream parent_instance;
|
||
|
|
|
||
|
|
/* This variable stores the progress of our video.
|
||
|
|
*/
|
||
|
|
gint64 progress;
|
||
|
|
|
||
|
|
/* This variable stores the timestamp of the last
|
||
|
|
* time we updated the progress variable when the
|
||
|
|
* video is currently playing.
|
||
|
|
* This is so that we can always accurately compute the
|
||
|
|
* progress we've had, even if the timeout does not
|
||
|
|
* exactly work.
|
||
|
|
*/
|
||
|
|
gint64 last_time;
|
||
|
|
|
||
|
|
/* This variable again holds the ID of the timer that
|
||
|
|
* updates our progress variable. Nothing changes about
|
||
|
|
* how this works compared to the previous example.
|
||
|
|
*/
|
||
|
|
guint source_id;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct _GtkNuclearMediaStreamClass
|
||
|
|
{
|
||
|
|
GObjectClass parent_class;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* GtkMediaStream is a GdkPaintable. So when we want to display video,
|
||
|
|
* we have to implement the interface, just like in the animation example.
|
||
|
|
*/
|
||
|
|
static void
|
||
|
|
gtk_nuclear_media_stream_snapshot (GdkPaintable *paintable,
|
||
|
|
GdkSnapshot *snapshot,
|
||
|
|
double width,
|
||
|
|
double height)
|
||
|
|
{
|
||
|
|
GtkNuclearMediaStream *nuclear = GTK_NUCLEAR_MEDIA_STREAM (paintable);
|
||
|
|
|
||
|
|
/* We call the function from the previous example here. */
|
||
|
|
gtk_nuclear_snapshot (snapshot,
|
||
|
|
&(GdkRGBA) { 0, 0, 0, 1 }, /* black */
|
||
|
|
&(GdkRGBA) { 0.9, 0.75, 0.15, 1.0 }, /* yellow */
|
||
|
|
width, height,
|
||
|
|
2 * G_PI * nuclear->progress / DURATION);
|
||
|
|
}
|
||
|
|
|
||
|
|
static GdkPaintable *
|
||
|
|
gtk_nuclear_media_stream_get_current_image (GdkPaintable *paintable)
|
||
|
|
{
|
||
|
|
GtkNuclearMediaStream *nuclear = GTK_NUCLEAR_MEDIA_STREAM (paintable);
|
||
|
|
|
||
|
|
/* Same thing as with the animation */
|
||
|
|
return gtk_nuclear_icon_new (2 * G_PI * nuclear->progress / DURATION);
|
||
|
|
}
|
||
|
|
|
||
|
|
static GdkPaintableFlags
|
||
|
|
gtk_nuclear_media_stream_get_flags (GdkPaintable *paintable)
|
||
|
|
{
|
||
|
|
/* And same thing as with the animation over here, too. */
|
||
|
|
return GDK_PAINTABLE_STATIC_SIZE;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gtk_nuclear_media_stream_paintable_init (GdkPaintableInterface *iface)
|
||
|
|
{
|
||
|
|
iface->snapshot = gtk_nuclear_media_stream_snapshot;
|
||
|
|
iface->get_current_image = gtk_nuclear_media_stream_get_current_image;
|
||
|
|
iface->get_flags = gtk_nuclear_media_stream_get_flags;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* This time, we inherit from GTK_TYPE_MEDIA_STREAM */
|
||
|
|
G_DEFINE_TYPE_WITH_CODE (GtkNuclearMediaStream, gtk_nuclear_media_stream, GTK_TYPE_MEDIA_STREAM,
|
||
|
|
G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
|
||
|
|
gtk_nuclear_media_stream_paintable_init))
|
||
|
|
|
||
|
|
static gboolean
|
||
|
|
gtk_nuclear_media_stream_step (gpointer data)
|
||
|
|
{
|
||
|
|
GtkNuclearMediaStream *nuclear = data;
|
||
|
|
gint64 current_time;
|
||
|
|
|
||
|
|
/* Compute the time that has elapsed since the last time we were called
|
||
|
|
* and add it to our current progress.
|
||
|
|
*/
|
||
|
|
current_time = g_source_get_time (g_main_current_source ());
|
||
|
|
nuclear->progress += current_time - nuclear->last_time;
|
||
|
|
|
||
|
|
/* Check if we've ended */
|
||
|
|
if (nuclear->progress > DURATION)
|
||
|
|
{
|
||
|
|
if (gtk_media_stream_get_loop (GTK_MEDIA_STREAM (nuclear)))
|
||
|
|
{
|
||
|
|
/* We're looping. So make the progress loop using modulo */
|
||
|
|
nuclear->progress %= DURATION;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/* Just make sure we don't overflow */
|
||
|
|
nuclear->progress = DURATION;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Update the last time to the current timestamp. */
|
||
|
|
nuclear->last_time = current_time;
|
||
|
|
|
||
|
|
/* Update the timestamp of the media stream */
|
||
|
|
gtk_media_stream_update (GTK_MEDIA_STREAM (nuclear), nuclear->progress);
|
||
|
|
|
||
|
|
/* We also need to invalidate our contents again.
|
||
|
|
* After all, we are a video and not just an audio stream.
|
||
|
|
*/
|
||
|
|
gdk_paintable_invalidate_contents (GDK_PAINTABLE (nuclear));
|
||
|
|
|
||
|
|
/* Now check if we have finished playing and if so,
|
||
|
|
* tell the media stream. The media stream will then
|
||
|
|
* call our pause function to pause the stream.
|
||
|
|
*/
|
||
|
|
if (nuclear->progress >= DURATION)
|
||
|
|
gtk_media_stream_stream_ended (GTK_MEDIA_STREAM (nuclear));
|
||
|
|
|
||
|
|
/* The timeout function is removed by the pause function,
|
||
|
|
* so we can just always return this value.
|
||
|
|
*/
|
||
|
|
return G_SOURCE_CONTINUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
static gboolean
|
||
|
|
gtk_nuclear_media_stream_play (GtkMediaStream *stream)
|
||
|
|
{
|
||
|
|
GtkNuclearMediaStream *nuclear = GTK_NUCLEAR_MEDIA_STREAM (stream);
|
||
|
|
|
||
|
|
/* If we're already at the end of the stream, we don't want
|
||
|
|
* to start playing and exit early.
|
||
|
|
*/
|
||
|
|
if (nuclear->progress >= DURATION)
|
||
|
|
return FALSE;
|
||
|
|
|
||
|
|
/* This time, we add the source only when we start playing.
|
||
|
|
*/
|
||
|
|
nuclear->source_id = g_timeout_add (10,
|
||
|
|
gtk_nuclear_media_stream_step,
|
||
|
|
nuclear);
|
||
|
|
|
||
|
|
/* We also want to initialize our time, so that we can
|
||
|
|
* do accurate updates.
|
||
|
|
*/
|
||
|
|
nuclear->last_time = g_get_monotonic_time ();
|
||
|
|
|
||
|
|
/* We successfully started playing, so we return TRUE here. */
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gtk_nuclear_media_stream_pause (GtkMediaStream *stream)
|
||
|
|
{
|
||
|
|
GtkNuclearMediaStream *nuclear = GTK_NUCLEAR_MEDIA_STREAM (stream);
|
||
|
|
|
||
|
|
/* This function will be called when a playing stream
|
||
|
|
* gets paused.
|
||
|
|
* So we remove the updating source here and set it
|
||
|
|
* back to 0 so that the finalize function doesn't try
|
||
|
|
* to remove it again.
|
||
|
|
*/
|
||
|
|
g_source_remove (nuclear->source_id);
|
||
|
|
nuclear->source_id = 0;
|
||
|
|
nuclear->last_time = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gtk_nuclear_media_stream_seek (GtkMediaStream *stream,
|
||
|
|
gint64 timestamp)
|
||
|
|
{
|
||
|
|
GtkNuclearMediaStream *nuclear = GTK_NUCLEAR_MEDIA_STREAM (stream);
|
||
|
|
|
||
|
|
/* This is optional functionality for media streams,
|
||
|
|
* but not being able to seek is kinda boring.
|
||
|
|
* And it's trivial to implement, so let's go for it.
|
||
|
|
*/
|
||
|
|
nuclear->progress = timestamp;
|
||
|
|
|
||
|
|
/* Media streams are asynchronous, so seeking can take a while.
|
||
|
|
* We however don't need that functionality, so we can just
|
||
|
|
* report success.
|
||
|
|
*/
|
||
|
|
gtk_media_stream_seek_success (stream);
|
||
|
|
|
||
|
|
/* We also have to update our timestamp and tell the
|
||
|
|
* paintable interface about the seek
|
||
|
|
*/
|
||
|
|
gtk_media_stream_update (stream, nuclear->progress);
|
||
|
|
gdk_paintable_invalidate_contents (GDK_PAINTABLE (nuclear));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Again, we need to implement the finalize function.
|
||
|
|
*/
|
||
|
|
static void
|
||
|
|
gtk_nuclear_media_stream_finalize (GObject *object)
|
||
|
|
{
|
||
|
|
GtkNuclearMediaStream *nuclear = GTK_NUCLEAR_MEDIA_STREAM (object);
|
||
|
|
|
||
|
|
/* This time, we need to check if the source exists before
|
||
|
|
* removing it as it only exists while we are playing.
|
||
|
|
*/
|
||
|
|
if (nuclear->source_id > 0)
|
||
|
|
g_source_remove (nuclear->source_id);
|
||
|
|
|
||
|
|
/* Don't forget to chain up to the parent class' implementation
|
||
|
|
* of the finalize function.
|
||
|
|
*/
|
||
|
|
G_OBJECT_CLASS (gtk_nuclear_media_stream_parent_class)->finalize (object);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* In the class declaration, we need to implement the media stream */
|
||
|
|
static void
|
||
|
|
gtk_nuclear_media_stream_class_init (GtkNuclearMediaStreamClass *klass)
|
||
|
|
{
|
||
|
|
GtkMediaStreamClass *stream_class = GTK_MEDIA_STREAM_CLASS (klass);
|
||
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
|
||
|
|
|
||
|
|
stream_class->play = gtk_nuclear_media_stream_play;
|
||
|
|
stream_class->pause = gtk_nuclear_media_stream_pause;
|
||
|
|
stream_class->seek = gtk_nuclear_media_stream_seek;
|
||
|
|
|
||
|
|
gobject_class->finalize = gtk_nuclear_media_stream_finalize;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gtk_nuclear_media_stream_init (GtkNuclearMediaStream *nuclear)
|
||
|
|
{
|
||
|
|
/* This time, we don't have to add a timer here, because media
|
||
|
|
* streams start paused.
|
||
|
|
*
|
||
|
|
* However, media streams need to tell GTK once they are initialized,
|
||
|
|
* so we do that here.
|
||
|
|
*/
|
||
|
|
gtk_media_stream_stream_prepared (GTK_MEDIA_STREAM (nuclear),
|
||
|
|
FALSE,
|
||
|
|
TRUE,
|
||
|
|
TRUE,
|
||
|
|
DURATION);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* And finally, we add the simple constructor we declared in the header. */
|
||
|
|
GtkMediaStream *
|
||
|
|
gtk_nuclear_media_stream_new (void)
|
||
|
|
{
|
||
|
|
return g_object_new (GTK_TYPE_NUCLEAR_MEDIA_STREAM, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
GtkWidget *
|
||
|
|
do_paintable_mediastream (GtkWidget *do_widget)
|
||
|
|
{
|
||
|
|
GtkMediaStream *nuclear;
|
||
|
|
GtkWidget *video;
|
||
|
|
|
||
|
|
if (!window)
|
||
|
|
{
|
||
|
|
window = gtk_window_new ();
|
||
|
|
gtk_window_set_display (GTK_WINDOW (window),
|
||
|
|
gtk_widget_get_display (do_widget));
|
||
|
|
gtk_window_set_title (GTK_WINDOW (window), "Nuclear MediaStream");
|
||
|
|
gtk_window_set_default_size (GTK_WINDOW (window), 300, 200);
|
||
|
|
g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
|
||
|
|
|
||
|
|
nuclear = gtk_nuclear_media_stream_new ();
|
||
|
|
gtk_media_stream_set_loop (GTK_MEDIA_STREAM (nuclear), TRUE);
|
||
|
|
|
||
|
|
video = gtk_video_new_for_media_stream (nuclear);
|
||
|
|
gtk_window_set_child (GTK_WINDOW (window), video);
|
||
|
|
|
||
|
|
g_object_unref (nuclear);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!gtk_widget_get_visible (window))
|
||
|
|
gtk_widget_set_visible (window, TRUE);
|
||
|
|
else
|
||
|
|
gtk_window_destroy (GTK_WINDOW (window));
|
||
|
|
|
||
|
|
return window;
|
||
|
|
}
|