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<p class="MsoNormal">Video player use frame callback on an event queue, sometimes there is synchronization issue.<o:p></o:p></p>
<p class="MsoNormal">After looked at other usage of event queue, I found:<o:p></o:p></p>
<p class="MsoNormal">In order to avoid blocking by wl_display_dispatch_queue(), a padding callback of wl_display_sync is added on purpose.<o:p></o:p></p>
<p class="MsoNormal">Is my understanding correct?<o:p></o:p></p>
<p class="MsoNormal">Here is the changes:<o:p></o:p></p>
<p class="MsoNormal"><a href="https://gitorious.org/halley-test/gstreamer-vaapi/commit/9846c75e7a2bb223900457beffc3384c77cc5075">https://gitorious.org/halley-test/gstreamer-vaapi/commit/9846c75e7a2bb223900457beffc3384c77cc5075</a>
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">however, with or without the above change, I found there is still hangs in my player (efl based) :
<o:p></o:p></p>
<p class="MsoNormal"><a href="https://gitorious.org/gst-plugins-vaapi/simple-player/source/87837fc1b4c11d7a33142c7d4fac1225d8973b80">https://gitorious.org/gst-plugins-vaapi/simple-player/source/87837fc1b4c11d7a33142c7d4fac1225d8973b80</a>:<o:p></o:p></p>
<p class="MsoNormal">it seems to be ECore issue during wl_display_dispatch_pending():<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Rafael:<o:p></o:p></p>
<p class="MsoNormal">Do you think it is an ECore issue?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">// wl_display_sync callback with wl_display_dispatch_pending()<o:p></o:p></p>
<p class="MsoNormal">(gdb) bt<o:p></o:p></p>
<p class="MsoNormal">#0 0xb7c4ddd0 in _ecore_wl_input_cb_keyboard_enter () from /lib/libecore_wayland.so.1<o:p></o:p></p>
<p class="MsoNormal">#1 0xb6f16666 in ffi_call_SYSV () from /lib/libffi.so.6<o:p></o:p></p>
<p class="MsoNormal">#2 0xb6f163eb in ffi_call () from /lib/libffi.so.6<o:p></o:p></p>
<p class="MsoNormal">#3 0xb79a9ae5 in wl_closure_invoke () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#4 0xb79a74c2 in dispatch_queue () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#5 0xb79a803e in wl_display_dispatch_queue_pending () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#6 0xb79a8162 in wl_display_dispatch_pending () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#7 0xb3ca72a6 in gst_vaapi_window_wayland_sync (window=0x87d2d50) at gstvaapiwindow_wayland.c:162<o:p></o:p></p>
<p class="MsoNormal">#8 gst_vaapi_window_wayland_render (window=0x87d2d50, surface=0xb0a02860, src_rect=0xb017dbd0, dst_rect=0x88bdbe0, flags=0) at gstvaapiwindow_wayland.c:514<o:p></o:p></p>
<p class="MsoNormal">#9 0xb3c5a2fb in gst_vaapi_window_put_surface (window=0x87d2d50, surface=surface@entry=0xb0a02860, src_rect=0xb017dbd0, src_rect@entry=0x0, dst_rect=<optimized out>, dst_rect@entry=0x88bdbe0,
<o:p></o:p></p>
<p class="MsoNormal"> flags=flags@entry=0) at gstvaapiwindow.c:435<o:p></o:p></p>
<p class="MsoNormal">#10 0xb3ccc1e1 in gst_vaapisink_put_surface (flags=0, surface_rect=<optimized out>, surface=0xb0a02860, sink=0x88bd958) at gstvaapisink.c:1150<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I remove wl_display_dispatch_pending in frame callback sync:<o:p></o:p></p>
<p class="MsoNormal">There is backtrace, <o:p></o:p></p>
<p class="MsoNormal">// wl_display_sync callback with wl_display_dispatch_pending()<o:p></o:p></p>
<p class="MsoNormal">(gdb) bt<o:p></o:p></p>
<p class="MsoNormal">#0 0xb7c4ddd0 in _ecore_wl_input_cb_keyboard_enter () from /lib/libecore_wayland.so.1<o:p></o:p></p>
<p class="MsoNormal">#1 0xb6f16666 in ffi_call_SYSV () from /lib/libffi.so.6<o:p></o:p></p>
<p class="MsoNormal">#2 0xb6f163eb in ffi_call () from /lib/libffi.so.6<o:p></o:p></p>
<p class="MsoNormal">#3 0xb79a9ae5 in wl_closure_invoke () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#4 0xb79a74c2 in dispatch_queue () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#5 0xb79a803e in wl_display_dispatch_queue_pending () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#6 0xb79a8162 in wl_display_dispatch_pending () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#7 0xb3ca72a6 in gst_vaapi_window_wayland_sync (window=0x87d2d50) at gstvaapiwindow_wayland.c:162<o:p></o:p></p>
<p class="MsoNormal">#8 gst_vaapi_window_wayland_render (window=0x87d2d50, surface=0xb0a02860, src_rect=0xb017dbd0, dst_rect=0x88bdbe0, flags=0) at gstvaapiwindow_wayland.c:514<o:p></o:p></p>
<p class="MsoNormal">#9 0xb3c5a2fb in gst_vaapi_window_put_surface (window=0x87d2d50, surface=surface@entry=0xb0a02860, src_rect=0xb017dbd0, src_rect@entry=0x0, dst_rect=<optimized out>, dst_rect@entry=0x88bdbe0,
<o:p></o:p></p>
<p class="MsoNormal"> flags=flags@entry=0) at gstvaapiwindow.c:435<o:p></o:p></p>
<p class="MsoNormal">#10 0xb3ccc1e1 in gst_vaapisink_put_surface (flags=0, surface_rect=<optimized out>, surface=0xb0a02860, sink=0x88bd958) at gstvaapisink.c:1150<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">// no wl_display_sync callback witt wl_display_displatch_pending<o:p></o:p></p>
<p class="MsoNormal">#0 0xb7c4ddd0 in _ecore_wl_input_cb_keyboard_enter () from /lib/libecore_wayland.so.1<o:p></o:p></p>
<p class="MsoNormal">#1 0xb6f16666 in ffi_call_SYSV () from /lib/libffi.so.6<o:p></o:p></p>
<p class="MsoNormal">#2 0xb6f163eb in ffi_call () from /lib/libffi.so.6<o:p></o:p></p>
<p class="MsoNormal">#3 0xb79a9ae5 in wl_closure_invoke () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#4 0xb79a74c2 in dispatch_queue () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#5 0xb79a803e in wl_display_dispatch_queue_pending () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#6 0xb79a8162 in wl_display_dispatch_pending () from /lib/libwayland-client.so.0<o:p></o:p></p>
<p class="MsoNormal">#7 0xb3ca72a6 in gst_vaapi_window_wayland_sync (window=0x87d2950) at gstvaapiwindow_wayland.c:162<o:p></o:p></p>
<p class="MsoNormal">#8 gst_vaapi_window_wayland_render (window=0x87d2950, surface=0xb0a02860, src_rect=0xb017dbd0, dst_rect=0x88bd850, flags=0) at gstvaapiwindow_wayland.c:514<o:p></o:p></p>
<p class="MsoNormal">#9 0xb3c5a2fb in gst_vaapi_window_put_surface (window=0x87d2950, surface=surface@entry=0xb0a02860, src_rect=0xb017dbd0, src_rect@entry=0x0, dst_rect=<optimized out>, dst_rect@entry=0x88bd850,
<o:p></o:p></p>
<p class="MsoNormal"> flags=flags@entry=0) at gstvaapiwindow.c:435<o:p></o:p></p>
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