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assrender: improve negotiation

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Check if downstream supports overlay meta, if possible use it and
if not fallback to no-overlay caps

https://bugzilla.gnome.org/show_bug.cgi?id=733916
This commit is contained in:
Thiago Santos 2014-08-11 12:22:44 -03:00
parent 7895d88369
commit 33c2372ae3
1 changed files with 58 additions and 3 deletions
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61
ext/assrender/gstassrender.c
View file

@ -793,13 +793,57 @@ gst_ass_render_setcaps_video (GstPad * pad, GstCaps * caps)
gdouble dar;
GstVideoInfo info;
gboolean attach = FALSE;
gboolean caps_has_meta = TRUE;
GstCapsFeatures *f;
GstCaps *original_caps = caps;
if (!gst_video_info_from_caps (&info, caps))
goto invalid_caps;
render->info = info;
gst_caps_ref (caps);
/* Try to use the overlay meta if possible */
f = gst_caps_get_features (caps, 0);
/* if the caps doesn't have the overlay meta, we query if downstream
* accepts it before trying the version without the meta
* If upstream already is using the meta then we can only use it */
if (!f
|| !gst_caps_features_contains (f,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION)) {
GstCaps *overlay_caps;
/* In this case we added the meta, but we can work without it
* so preserve the original caps so we can use it as a fallback */
overlay_caps = gst_caps_copy (caps);
f = gst_caps_get_features (overlay_caps, 0);
if (f == NULL) {
f = gst_caps_features_new
(GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, NULL);
} else {
gst_caps_features_add (f,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION);
}
ret = gst_pad_peer_query_accept_caps (render->srcpad, overlay_caps);
GST_DEBUG_OBJECT (render, "Downstream accepts the overlay meta: %d", ret);
if (ret) {
gst_caps_unref (caps);
caps = overlay_caps;
} else {
/* fallback to the original */
gst_caps_unref (overlay_caps);
caps_has_meta = FALSE;
}
}
GST_DEBUG_OBJECT (render, "Using caps %" GST_PTR_FORMAT, caps);
ret = gst_pad_set_caps (render->srcpad, caps);
gst_caps_unref (caps);
if (!ret)
goto out;
@ -807,7 +851,7 @@ gst_ass_render_setcaps_video (GstPad * pad, GstCaps * caps)
render->height = info.height;
query = gst_query_new_allocation (caps, FALSE);
if (gst_pad_peer_query (render->srcpad, query)) {
if (caps_has_meta && gst_pad_peer_query (render->srcpad, query)) {
if (gst_query_find_allocation_meta (query,
GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE, NULL))
attach = TRUE;
@ -816,8 +860,19 @@ gst_ass_render_setcaps_video (GstPad * pad, GstCaps * caps)
render->attach_compo_to_buffer = attach;
if (!attach && !gst_ass_render_can_handle_caps (caps))
goto unsupported_caps;
if (!attach) {
if (caps_has_meta) {
/* Some elements (fakesink) claim to accept the meta on caps but won't
put it in the allocation query result, this leads below
check to fail. Prevent this by removing the meta from caps */
caps = original_caps;
ret = gst_pad_set_caps (render->srcpad, caps);
if (!ret)
goto out;
}
if (!gst_ass_render_can_handle_caps (caps))
goto unsupported_caps;
}
g_mutex_lock (&render->ass_mutex);
ass_set_frame_size (render->ass_renderer, render->width, render->height);