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plugins: add helper for detecting VA surfaces in caps.

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Introduce new gst_caps_has_vaapi_surface() helper function to detect
whether the supplied caps has VA surfaces. With GStreamer >= 1.2, this
implies a check for memory:VASurface caps features, and format=ENCODED
for earlier versions of GStreamer.
This commit is contained in:
Gwenole Beauchesne 2014-08-20 11:30:41 +02:00
parent 3b2e06be6c
commit 95d1826dca
2 changed files with 48 additions and 0 deletions
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44
gst/vaapi/gstvaapipluginutil.c
View file

@ -612,3 +612,47 @@ gst_caps_set_interlaced (GstCaps * caps, GstVideoInfo * vip)
#endif
return TRUE;
}
/* Checks whether the supplied caps contain VA surfaces */
gboolean
gst_caps_has_vaapi_surface (GstCaps * caps)
{
gboolean found_caps = FALSE;
guint i, num_structures;
g_return_val_if_fail (caps != NULL, FALSE);
num_structures = gst_caps_get_size (caps);
if (num_structures < 1)
return FALSE;
#if GST_CHECK_VERSION(1,1,0)
for (i = 0; i < num_structures && !found_caps; i++) {
GstCapsFeatures *const features = gst_caps_get_features (caps, i);
#if GST_CHECK_VERSION(1,3,0)
/* Skip ANY features, we need an exact match for correct evaluation */
if (gst_caps_features_is_any (features))
continue;
#endif
found_caps = gst_caps_features_contains (features,
GST_CAPS_FEATURE_MEMORY_VAAPI_SURFACE);
}
#else
for (i = 0; i < num_structures && !found_caps; i++) {
GstStructure *const structure = gst_caps_get_structure (caps, i);
GstCaps *test_caps;
GstVideoInfo vi;
test_caps = gst_caps_new_full (gst_structure_copy (structure), NULL);
if (!test_caps)
continue;
found_caps = gst_video_info_from_caps (&vi, test_caps) &&
GST_VIDEO_INFO_FORMAT (&vi) == GST_VIDEO_FORMAT_ENCODED;
gst_caps_unref (test_caps);
}
#endif
return found_caps;
}

4
gst/vaapi/gstvaapipluginutil.h
View file

@ -109,4 +109,8 @@ G_GNUC_INTERNAL
gboolean
gst_caps_set_interlaced (GstCaps * caps, GstVideoInfo * vip);
G_GNUC_INTERNAL
gboolean
gst_caps_has_vaapi_surface (GstCaps * caps);
#endif /* GST_VAAPI_PLUGIN_UTIL_H */