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videoaggregator: allow selecting an alpha output from non-alpha inputs

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e.g. if we have:

video-x/raw,format=I420 ! compositor ! video/x-raw,format=BGRA

This will currently produce a warning as the alpha-ness of the chosen
'best' format (I420) will be different from the value restricted by the
downstream caps filter.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1059>
This commit is contained in:
Matthew Waters 2021-03-03 18:28:54 +11:00 committed by Thibault Saunier
parent 141b8c4399
commit 3d9e705621
1 changed files with 3 additions and 1 deletions
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4
gst-libs/gst/video/gstvideoaggregator.c
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@ -951,7 +951,9 @@ gst_video_aggregator_find_best_format (GstVideoAggregator * vagg,
for (i = 0; i < vagg->priv->supported_formats->len; i++) {
GstVideoFormatInfo *format_info = vagg->priv->supported_formats->pdata[i];
if ((! !GST_VIDEO_FORMAT_INFO_HAS_ALPHA (format_info)) == (! !need_alpha)) {
/* either we don't care about alpha, or the output format needs to have
* alpha */
if (!need_alpha || GST_VIDEO_FORMAT_INFO_HAS_ALPHA (format_info)) {
gst_video_info_set_format (best_info, format_info->format,
best_info->width, best_info->height);
possible_caps =