On Tue, Feb 12, 2013 at 4:41 PM, Carsten Haitzler <ras...@rasterman.com> wrote:
> On Fri, 1 Feb 2013 22:29:56 +0530 Arvind R <arvin...@gmail.com> said:
>
> there - i did my changes to update less frequently - different to your
> framecount method (time based with timeouts and deletion handling). rev 83854.
>
On further probing, I found the following modification (included in
the post on completing the mouse interface) to really clobber the bug.
This does not require any minimisation/delay of update frequency, ...
. It works on all my test clips with all backends (of emotion). From
this, maybe you can figure out the actual cause of the bug - it may
not be solved by your timer fix - I have to check it out.
@@ -176,9 +248,15 @@ _update_position(void *data,
Evas_Object *obj __UNUSED__,
void *event_info __UNUSED__)
{
+ double pos;
+
ELM_PLAYER_DATA_GET(data, sd);
- elm_video_play_position_set(sd->video, elm_slider_value_get(sd->slider));
+ pos = elm_slider_value_get(sd->slider);
+ if (fabs(sd->pos - pos) > 0.1) {
+ elm_video_play_position_set(sd->video, pos);
+ sd->pos = pos;
+ }
}
>> Hi,
>>
>> The slider emits a "changed" signal when its internal representation
>> of value really changes. It does not know whether the user dragged it
>> or internal updates caused the value change. Most internal incremental
>> updates when trimmed to the current resolution of the slider, do not
>> cause a value change and the signal is not emitted on every "set".
>>
>> This behaviour causes a 'feedback-loop' in that the "changed" signal
>> from an internal update, being undifferentiated from a "user-drag",
>> causes a delayed reposition command to the emotion engine. The result
>> is a nice 'track-jump-repeat' which in some extreme cases, a
>> 'stuck-in-a-groove' effect.
>>
>> The foll. patch is a solution to this problem; and also reduces the
>> frequency of slider updates. An alternate solution would be to use
>> _smart_callback_del() before actually updating slider in
>> elc_player.c:_update_slider(), and re-installing it back - but this
>> could open the door to race conditions.
>>
>> Arvind
>> ---
>>
>> diff -uprN a/src/lib/elc_player.c b/src/lib/elc_player.c
>> --- a/src/lib/elc_player.c 2013-02-01 21:59:39.000000000 +0530
>> +++ b/src/lib/elc_player.c 2013-02-01 21:59:54.000000000 +0530
>> @@ -163,12 +163,35 @@ _update_slider(void *data,
>> ELM_PLAYER_DATA_GET(data, sd);
>>
>> seekable = elm_video_is_seekable_get(sd->video);
>> + if (seekable == sd->disabled)
>> + elm_object_disabled_set(sd->slider, !seekable);
>> +
>> length = elm_video_play_length_get(sd->video);
>> - pos = elm_video_play_position_get(sd->video);
>>
>> - elm_object_disabled_set(sd->slider, !seekable);
>> - elm_slider_min_max_set(sd->slider, 0, length);
>> - elm_slider_value_set(sd->slider, pos);
>> + if (sd->length != length) {
>> + sd->length = length;
>> + elm_slider_min_max_set(sd->slider, 0, length);
>> + }
>> +
>> + if (sd->frames < 0) {
>> + pos = elm_video_play_position_get(sd->video);
>> + if (fabs(sd->pos - pos) > 0.5) {
>> + sd->pos = pos;
>> + sd->frames = 30;
>> + elm_slider_value_set(sd->slider, pos);
>> + }
>> + }
>> +}
>> +
>> +static void
>> +_frame_decoded_cb(void *data,
>> + Evas_Object *obj __UNUSED__,
>> + void *event_info __UNUSED__)
>> +{
>> + ELM_PLAYER_DATA_GET(data, sd);
>> + /* do not update slider on every frame */
>> + if (--sd->frames < 0)
>> + _update_slider(data, obj, event_info);
>> }
>>
>> static void
>> @@ -176,9 +199,24 @@ _update_position(void *data,
>> Evas_Object *obj __UNUSED__,
>> void *event_info __UNUSED__)
>> {
>> + /*
>> + * called wnenever the value of the slider is changed.
>> + * - irespective of user drags
>> + * or
>> + * internal increments larger than the slider resolution.
>> + * the 2nd case causes an inadvertent repositioning of stream
>> + * which some engines respond to (xine).
>> + * This is a feedback loop that needs to be broken.
>> + */
>> + double pos;
>> +
>> ELM_PLAYER_DATA_GET(data, sd);
>>
>> - elm_video_play_position_set(sd->video, elm_slider_value_get(sd->slider));
>> + pos = elm_slider_value_get(sd->slider);
>> + if (fabs(sd->pos - pos) > 0.25) {
>> + elm_video_play_position_set(sd->video, pos);
>> + sd->pos = pos;
>> + }
>> }
>>
>> static void
>> @@ -455,7 +493,7 @@ _elm_player_smart_content_set(Eo *obj, v
>> else elm_layout_signal_emit(obj, "elm,player,pause", "elm");
>>
>> evas_object_smart_callback_add(sd->emotion, "frame_decode",
>> - _update_slider, obj);
>> + _frame_decoded_cb, obj);
>> evas_object_smart_callback_add(sd->emotion, "frame_resize",
>> _update_slider, obj);
>> evas_object_smart_callback_add(sd->emotion, "length_change",
>> @@ -495,9 +533,13 @@ _elm_player_smart_add(Eo *obj, void *_pd
>> (priv->slider, _double_to_time, _str_free);
>> elm_slider_units_format_function_set
>> (priv->slider, _double_to_time, _str_free);
>> - elm_slider_min_max_set(priv->slider, 0, 0);
>> + elm_slider_min_max_set(priv->slider, 0, 1);
>> elm_slider_value_set(priv->slider, 0);
>> elm_object_disabled_set(priv->slider, EINA_TRUE);
>> + priv->disabled = EINA_TRUE;
>> + priv->length = 0.0;
>> + priv->frames = 0;
>> + priv->pos = 0.0;
>> evas_object_size_hint_align_set(priv->slider, EVAS_HINT_FILL, 0.5);
>> evas_object_size_hint_weight_set
>> (priv->slider, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
>> diff -uprN a/src/lib/elm_widget_player.h b/src/lib/elm_widget_player.h
>> --- a/src/lib/elm_widget_player.h 2012-11-26 12:02:53.000000000 +0530
>> +++ b/src/lib/elm_widget_player.h 2013-02-01 21:59:54.000000000 +0530
>> @@ -33,6 +33,11 @@ struct _Elm_Player_Smart_Data
>> Evas_Object *rewind;
>> Evas_Object *stop;
>> Evas_Object *slider;
>> +
>> + Eina_Bool disabled; /* used for only-when-must changes */
>> + double length; /* --- ditto --- */
>> + short frames; /* used to reduce update frequency */
>> + double pos; /* inter-callback communication to break
>> slider feedback loop */
>> };
>>
>> /**
>>
>> ------------------------------------------------------------------------------
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>
>
> --
> ------------- Codito, ergo sum - "I code, therefore I am" --------------
> The Rasterman (Carsten Haitzler) ras...@rasterman.com
>
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