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plugins: fix detection of upstream v4l2src element.

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Improve check for upstream element that requires DMABUF buffer pool,
e.g. v4l2src element. In particular, make sure to traverse through
any additional capsfilter for instance.

Note: the traversal to the top-most upstream element could be made
more generic, but we are insofar only interested in supporting pipes
similar to v4l2src or v4l2src ! capsfilter, e.g. with an explicit
specification for a desired video camera format, or resolution.
This commit is contained in:
Gwenole Beauchesne 2015-03-02 13:28:41 +01:00
parent 8b91ddac0b
commit 336eddffa5
1 changed files with 28 additions and 9 deletions
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37
gst/vaapi/gstvaapipluginbase.c
View file

@ -433,27 +433,46 @@ has_dmabuf_capable_peer (GstVaapiPluginBase * plugin, GstPad * pad)
gboolean is_dmabuf_capable = FALSE;
gint v;
do {
gst_object_ref (pad);
for (;;) {
other_pad = gst_pad_get_peer (pad);
gst_object_unref (pad);
if (!other_pad)
break;
element = gst_pad_get_parent_element (other_pad);
if (!element || !GST_IS_PUSH_SRC (element))
gst_object_unref (other_pad);
if (!element)
break;
element_name = gst_element_get_name (element);
if (!element_name || sscanf (element_name, "v4l2src%d", &v) != 1)
if (GST_IS_PUSH_SRC (element)) {
element_name = gst_element_get_name (element);
if (!element_name || sscanf (element_name, "v4l2src%d", &v) != 1)
break;
v = 0;
g_object_get (element, "io-mode", &v, NULL);
is_dmabuf_capable = v == 5; /* "dmabuf-import" enum value */
break;
} else if (GST_IS_BASE_TRANSFORM (element)) {
element_name = gst_element_get_name (element);
if (!element_name || sscanf (element_name, "capsfilter%d", &v) != 1)
break;
pad = gst_element_get_static_pad (element, "sink");
if (!pad)
break;
} else
break;
v = 0;
g_object_get (element, "io-mode", &v, NULL);
is_dmabuf_capable = v == 5; /* "dmabuf-import" enum value */
} while (0);
g_free (element_name);
element_name = NULL;
g_clear_object (&element);
}
g_free (element_name);
g_clear_object (&element);
g_clear_object (&other_pad);
return is_dmabuf_capable;
}