GES 1.12 -- GESVideoSource does not have the 'zorder' property

[Thibault Saunier]

Also I removed the mention to GESVideoSource::zorder in the
documentation: https://cgit.freedesktop.org/gstreamer/gst-editing-services/commit/?id=4cff10fb916d209ede449e1172fad5e38b3c5dd8
avoiding the confusion!

On Mon, Mar 19, 2018 at 7:09 AM, Thibault Saunier
<saunierthibault at gmail.com> wrote:
> Hello,
>
> The `zorder` of sources linked to the compositor is computed from the source
> layer priority. The clips from layers with highest prio (lower number) have
> a higher zorder (rendered on top).
>
> Regards,
>
> Thibault
>
> On Mon, Mar 19, 2018, 03:11 David Ing <ding at panopto.com> wrote:
>>
>> According to the documentation, I am supposed to be able to set the
>> 'zorder' property of a GESVideoSource:
>>
>>
>> https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-editing-services/html/GESVideoSource.html
>>
>> Well I am able to set some of its other properties (posx, posy, width,
>> height), but I get a WARN message when I attempt to set 'zorder' ... it
>> tells me that this proprety does not exist (so I cannot set it).
>>
>> 0:00:23.128239884  3376 000001FAD2B640F0 WARN  ges
>> ges-timeline-element.c:1379:ges_timeline_element_set_child_property:<GESVideoUriSource at 000001FAD3111460>
>> The zorder property doesn't exist
>>
>> I am trying to render a small video in the corner of a larger video (where
>> the smaller video is in front of the larger one).  Presumably I need
>> 'zorder' for that to work, right?  Or is there some other way that I can do
>> it?
>>
>> Either the documentation is wrong about zorder, or I am doing something
>> wrong.  Here is what I am doing:
>>
>> //----------------------------
>> // My code is below.
>> //----------------------------
>> GList* videoElements = ges_clip_find_track_elements((GESClip*)gesUriClip,
>> gesVideoTrack,
>>         GESTrackType::GES_TRACK_TYPE_VIDEO, G_TYPE_NONE);
>> GESVideoSource* videoSource = (GESVideoSource*)videoElements->data;
>> GESTrackElement* trackElement =
>> reinterpret_cast<GESTrackElement*>(videoSource);
>> setInt(trackElement, "posx", destPosition.x.value, "Unable to set %s
>> property of video source.");
>> setInt(trackElement, "posy", destPosition.y.value, "Unable to set %s
>> property of video source.");
>> setInt(trackElement, "width", destPosition.width.value, "Unable to set %s
>> property of video source.");
>> setInt(trackElement, "height", destPosition.height.value, "Unable to set
>> %s property of video source.");
>> // FIXME ... why doesn't this work?
>> setUint(trackElement, "zorder", (uint32_t)(iLayer), "Unable to set %s
>> property of video source.");
>>
>> void setInt(GESTrackElement* trackElement, const char* name, int32_t
>> value, const char* errorMessage)
>> {
>>     GValue val = G_VALUE_INIT;
>>     g_value_init(&val, G_TYPE_INT);
>>     g_value_set_int(&val, value);
>>     if (!ges_track_element_set_child_property(trackElement, name, &val))
>>         throw std::runtime_error(formstr(errorMessage, name));
>> }
>> void setUint(GESTrackElement* trackElement, const char* name, uint32_t
>> value, const char* errorMessage)
>> {
>>     GValue val = G_VALUE_INIT;
>>     g_value_init(&val, G_TYPE_UINT);
>>     g_value_set_uint(&val, value);
>>     if (!ges_track_element_set_child_property(trackElement, name, &val))
>>         throw std::runtime_error(formstr(errorMessage, name));
>> }
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