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waylandsink: remove the buffer from the surface when going PAUSED -> READY

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This essentially hides the video and allows the application to
potentially draw a black background or whatever else it wants.
This allows to differentiate the "paused" and "stopped" modes
from the user's point of view.

Also reworded a comment there to make my thinking more clear,
since the "reason for keeping the display around" is not really
the exposed() calls, as there is no buffer shown in READY/NULL
anymore.
This commit is contained in:
George Kiagiadakis 2014-06-16 18:03:51 +02:00
parent 76c0007778
commit c4616a550a
1 changed files with 22 additions and 7 deletions
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25
ext/wayland/gstwaylandsink.c
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@ -332,17 +332,32 @@ gst_wayland_sink_change_state (GstElement * element, GstStateChange transition)
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (sink->window && gst_wl_window_is_toplevel (sink->window)) {
gst_buffer_replace (&sink->last_buffer, NULL);
if (sink->window) {
if (gst_wl_window_is_toplevel (sink->window)) {
g_clear_object (&sink->window);
} else {
/* remove buffer from surface, show nothing */
wl_surface_attach (sink->window->surface, NULL, 0, 0);
wl_surface_damage (sink->window->surface, 0, 0,
sink->window->surface_width, sink->window->surface_height);
wl_surface_commit (sink->window->surface);
wl_display_flush (sink->display->display);
}
}
break;
case GST_STATE_CHANGE_READY_TO_NULL:
g_mutex_lock (&sink->display_lock);
/* We don't need to keep the display around, unless we are embedded
* in another window as a subsurface, in which case we should continue
* to respond to expose() and therefore both the window and the display
* are kept alive */
/* If we had a toplevel window, we most likely have our own connection
* to the display too, and it is a good idea to disconnect and allow
* potentially the application to embed us with GstVideoOverlay
* (which requires to re-use the same display connection as the parent
* surface). If we didn't have a toplevel window, then the display
* connection that we have is definitely shared with the application
* and it's better to keep it around (together with the window handle)
* to avoid requesting them again from the application if/when we are
* restarted (GstVideoOverlay behaves like that in other sinks)
*/
if (sink->display && !sink->window) { /* -> the window was toplevel */
/* Force all buffers to return to the pool, regardless of
* whether the compositor has released them or not. We are