From e6a21299778538f7ec5d63a1ba6dd1ce248e233c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian.droege@collabora.co.uk>
Date: Thu, 24 Nov 2011 09:55:47 +0100
Subject: [PATCH] dcaparse: Implement ::get_sink_caps vfunc to propagate
 downstream caps constraints upstream

---
 gst/audioparsers/gstdcaparse.c | 35 ++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/gst/audioparsers/gstdcaparse.c b/gst/audioparsers/gstdcaparse.c
index 2c020e7144..14d313d534 100644
--- a/gst/audioparsers/gstdcaparse.c
+++ b/gst/audioparsers/gstdcaparse.c
@@ -78,6 +78,7 @@ static gboolean gst_dca_parse_check_valid_frame (GstBaseParse * parse,
     GstBaseParseFrame * frame, guint * size, gint * skipsize);
 static GstFlowReturn gst_dca_parse_parse_frame (GstBaseParse * parse,
     GstBaseParseFrame * frame);
+static GstCaps *gst_dca_parse_get_sink_caps (GstBaseParse * parse);
 
 GST_BOILERPLATE (GstDcaParse, gst_dca_parse, GstBaseParse, GST_TYPE_BASE_PARSE);
 
@@ -112,6 +113,7 @@ gst_dca_parse_class_init (GstDcaParseClass * klass)
   parse_class->check_valid_frame =
       GST_DEBUG_FUNCPTR (gst_dca_parse_check_valid_frame);
   parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_dca_parse_parse_frame);
+  parse_class->get_sink_caps = GST_DEBUG_FUNCPTR (gst_dca_parse_get_sink_caps);
 }
 
 static void
@@ -450,3 +452,36 @@ broken_header:
     return GST_FLOW_ERROR;
   }
 }
+
+static GstCaps *
+gst_dca_parse_get_sink_caps (GstBaseParse * parse)
+{
+  GstCaps *peercaps;
+  GstCaps *res;
+
+  peercaps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (parse));
+  if (peercaps) {
+    guint i, n;
+
+    /* Remove the framed field */
+    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, "framed");
+    }
+
+    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;
+}