amrparse: Implement ::get_sink_caps vfunc to propagate downstream caps constraints...

diff --git a/gst/audioparsers/gstamrparse.c b/gst/audioparsers/gstamrparse.c
index 3dbd3e0..90a65c4 100644 (file)
--- a/gst/audioparsers/gstamrparse.c
+++ b/gst/audioparsers/gstamrparse.c
@@ -76,6 +76,7 @@ static gboolean gst_amr_parse_stop (GstBaseParse * parse);
 
 static gboolean gst_amr_parse_sink_setcaps (GstBaseParse * parse,
     GstCaps * caps);
+static GstCaps *gst_amr_parse_sink_getcaps (GstBaseParse * parse);
 
 static gboolean gst_amr_parse_check_valid_frame (GstBaseParse * parse,
     GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
@@ -125,6 +126,7 @@ gst_amr_parse_class_init (GstAmrParseClass * klass)
   parse_class->start = GST_DEBUG_FUNCPTR (gst_amr_parse_start);
   parse_class->stop = GST_DEBUG_FUNCPTR (gst_amr_parse_stop);
   parse_class->set_sink_caps = GST_DEBUG_FUNCPTR (gst_amr_parse_sink_setcaps);
+  parse_class->get_sink_caps = GST_DEBUG_FUNCPTR (gst_amr_parse_sink_getcaps);
   parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_amr_parse_parse_frame);
   parse_class->check_valid_frame =
       GST_DEBUG_FUNCPTR (gst_amr_parse_check_valid_frame);
@@ -392,3 +394,39 @@ gst_amr_parse_stop (GstBaseParse * parse)
   amrparse->header = 0;
   return TRUE;
 }
+
+static GstCaps *
+gst_amr_parse_sink_getcaps (GstBaseParse * parse)
+{
+  GstCaps *peercaps;
+  GstCaps *res;
+
+  peercaps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (parse));
+  if (peercaps) {
+    guint i, n;
+
+    /* Rename structure names */
+    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);
+
+      if (gst_structure_has_name (s, "audio/AMR"))
+        gst_structure_set_name (s, "audio/x-amr-nb-sh");
+      else
+        gst_structure_set_name (s, "audio/x-amr-wb-sh");
+    }
+
+    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;
+}