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videomixer: explicitly fail when alpha information would have been lost.

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This commit is contained in:
Mathieu Duponchelle 2013-11-27 16:15:12 +01:00
parent 37c73391ef
commit 532598e360
1 changed files with 12 additions and 0 deletions
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12
gst/videomixer/videomixer2.c
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@ -300,6 +300,7 @@ gst_videomixer2_update_converters (GstVideoMixer2 * mix)
GstVideoInfo best_info;
GstVideoMixer2Pad *pad;
gboolean need_alpha = FALSE;
gboolean at_least_one_alpha = FALSE;
GstCaps *downstream_caps;
GstCaps *possible_caps;
gchar *best_colorimetry;
@ -325,6 +326,9 @@ gst_videomixer2_update_converters (GstVideoMixer2 * mix)
if (!pad->info.finfo)
continue;
if (pad->info.finfo->flags & GST_VIDEO_FORMAT_FLAG_ALPHA)
at_least_one_alpha = TRUE;
/* If we want alpha, disregard all the other formats */
if (need_alpha && !(pad->info.finfo->flags & GST_VIDEO_FORMAT_FLAG_ALPHA))
continue;
@ -379,6 +383,14 @@ gst_videomixer2_update_converters (GstVideoMixer2 * mix)
gst_caps_unref (downstream_caps);
if (at_least_one_alpha
&& !(best_info.finfo->flags & GST_VIDEO_FORMAT_FLAG_ALPHA)) {
GST_ELEMENT_ERROR (mix, CORE, NEGOTIATION,
("At least one of the input pads contains alpha, but downstream can't support alpha."),
("Either convert your inputs to not contain alpha or add a videoconvert after the mixer"));
return FALSE;
}
best_colorimetry = gst_video_colorimetry_to_string (&(best_info.colorimetry));
best_chroma = gst_video_chroma_to_string (best_info.chroma_site);
mix->info = best_info;