h264parse: Implement ::sink_get_caps to allow stream-format conversion again

Just proxying the downstream caps will prevent h264parse from
accepting a different stream-format than what is supported
downstream, although it could convert to a different stream-format.

1 files changed, 34 insertions, 0 deletions

diff --git a/gst/videoparsers/gsth264parse.c b/gst/videoparsers/gsth264parse.c
index 2127125f4..6fdad115b 100644
--- a/gst/videoparsers/gsth264parse.c
+++ b/gst/videoparsers/gsth264parse.c
@@ -91,6 +91,7 @@ static void gst_h264_parse_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);
 
 static gboolean gst_h264_parse_set_caps (GstBaseParse * parse, GstCaps * caps);
+static GstCaps *gst_h264_parse_get_caps (GstBaseParse * parse);
 static GstFlowReturn gst_h264_parse_chain (GstPad * pad, GstBuffer * buffer);
 
 static void
@@ -138,6 +139,7 @@ gst_h264_parse_class_init (GstH264ParseClass * klass)
   parse_class->pre_push_frame =
       GST_DEBUG_FUNCPTR (gst_h264_parse_pre_push_frame);
   parse_class->set_sink_caps = GST_DEBUG_FUNCPTR (gst_h264_parse_set_caps);
+  parse_class->get_sink_caps = GST_DEBUG_FUNCPTR (gst_h264_parse_get_caps);
 }
 
 static void
@@ -1336,6 +1338,38 @@ refuse_caps:
   }
 }
 
+static GstCaps *
+gst_h264_parse_get_caps (GstBaseParse * parse)
+{
+  GstCaps *peercaps;
+  GstCaps *res;
+
+  peercaps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (parse));
+  if (peercaps) {
+    guint i, n;
+
+    peercaps = gst_caps_make_writable (peercaps);
+    n = gst_caps_get_size (peercaps);
+    for (i = 0; i < n; i++) {
+      GstStructure *s = gst_caps_get_structure (peercaps, i);
+      gst_structure_remove_field (s, "alignment");
+      gst_structure_remove_field (s, "stream-format");
+    }
+
+    res =
+        gst_caps_intersect_full (peercaps,
+        gst_pad_get_pad_template_caps (GST_BASE_PARSE_SRC_PAD (parse)),
+        GST_CAPS_INTERSECT_FIRST);
+    gst_caps_unref (peercaps);
+  } else {
+    res =
+        gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_PARSE_SRC_PAD
+            (parse)));
+  }
+
+  return res;
+}
+
 static GstFlowReturn
 gst_h264_parse_chain (GstPad * pad, GstBuffer * buffer)
 {