gdpdepay: Query for buffer allocator before using default

https://bugzilla.gnome.org/show_bug.cgi?id=764361

gst/gdp/dataprotocol.c

@@ -477,6 +477,8 @@ gst_dp_header_payload_type (const guint8 * header)
  * gst_dp_buffer_from_header:
  * @header_length: the length of the packet header
  * @header: the byte array of the packet header
+ * @allocator: the allocator used to allocate the new #GstBuffer
+ * @allocation_params: the allocations parameters used to allocate the new #GstBuffer
  *
  * Creates a newly allocated #GstBuffer from the given header.
  * The buffer data needs to be copied into it before validating.
@@ -490,7 +492,8 @@ gst_dp_header_payload_type (const guint8 * header)
  * Returns: A #GstBuffer if the buffer was successfully created, or NULL.
  */
 GstBuffer *
-gst_dp_buffer_from_header (guint header_length, const guint8 * header)
+gst_dp_buffer_from_header (guint header_length, const guint8 * header,
+    GstAllocator * allocator, GstAllocationParams * allocation_params)
 {
   GstBuffer *buffer;
 
@@ -500,8 +503,8 @@ gst_dp_buffer_from_header (guint header_length, const guint8 * header)
       GST_DP_PAYLOAD_BUFFER, NULL);
 
   buffer =
-      gst_buffer_new_allocate (NULL,
-      (guint) GST_DP_HEADER_PAYLOAD_LENGTH (header), NULL);
+      gst_buffer_new_allocate (allocator,
+      (guint) GST_DP_HEADER_PAYLOAD_LENGTH (header), allocation_params);
 
   GST_BUFFER_TIMESTAMP (buffer) = GST_DP_HEADER_TIMESTAMP (header);
   GST_BUFFER_DTS (buffer) = GST_DP_HEADER_DTS (header);

gst/gdp/dataprotocol.h

@@ -78,7 +78,9 @@ GstDPPayloadType
 
 /* converting to GstBuffer/GstEvent/GstCaps */
 GstBuffer *     gst_dp_buffer_from_header       (guint header_length,
-                                                const guint8 * header);
+                                                const guint8 * header,
+                                                GstAllocator * allocator,
+                                                GstAllocationParams * allocation_params);
 GstCaps *       gst_dp_caps_from_packet         (guint header_length,
                                                 const guint8 * header,
                                                 const guint8 * payload);

gst/gdp/gstgdpdepay.c

@@ -86,6 +86,7 @@ static void gst_gdp_depay_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec);
 static void gst_gdp_depay_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);
+static void gst_gdp_depay_decide_allocation (GstGDPDepay * depay);
 
 static void
 gst_gdp_depay_class_init (GstGDPDepayClass * klass)
@@ -140,6 +141,9 @@ gst_gdp_depay_init (GstGDPDepay * gdpdepay)
   gst_element_add_pad (GST_ELEMENT (gdpdepay), gdpdepay->srcpad);
 
   gdpdepay->adapter = gst_adapter_new ();
+
+  gdpdepay->allocator = NULL;
+  gst_allocation_params_init (&gdpdepay->allocation_params);
 }
 
 static void
@@ -153,6 +157,8 @@ gst_gdp_depay_finalize (GObject * gobject)
   g_free (this->header);
   gst_adapter_clear (this->adapter);
   g_object_unref (this->adapter);
+  if (this->allocator)
+    gst_object_unref (this->allocator);
 
   GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (gobject));
 }
@@ -265,6 +271,10 @@ gst_gdp_depay_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
 
   this = GST_GDP_DEPAY (parent);
 
+  if (gst_pad_check_reconfigure (this->srcpad)) {
+    gst_gdp_depay_decide_allocation (this);
+  }
+
   /* On DISCONT, get rid of accumulated data. We assume a buffer after the
    * DISCONT contains (part of) a new valid header, if not we error because we
    * lost sync */
@@ -352,7 +362,9 @@ gst_gdp_depay_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
           goto no_caps;
 
         GST_LOG_OBJECT (this, "reading GDP buffer from adapter");
-        buf = gst_dp_buffer_from_header (GST_DP_HEADER_LENGTH, this->header);
+        buf =
+            gst_dp_buffer_from_header (GST_DP_HEADER_LENGTH, this->header,
+            this->allocator, &this->allocation_params);
         if (!buf)
           goto buffer_failed;
 
@@ -411,6 +423,7 @@ gst_gdp_depay_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
         GST_DEBUG_OBJECT (this, "deserialized caps %" GST_PTR_FORMAT, caps);
         gst_caps_replace (&(this->caps), caps);
         gst_pad_set_caps (this->srcpad, caps);
+        gst_gdp_depay_decide_allocation (this);
         /* drop the creation ref we still have */
         gst_caps_unref (caps);
 
@@ -521,6 +534,10 @@ gst_gdp_depay_change_state (GstElement * element, GstStateChange transition)
         this->caps = NULL;
       }
       gst_adapter_clear (this->adapter);
+      if (this->allocator)
+        gst_object_unref (this->allocator);
+      this->allocator = NULL;
+      gst_allocation_params_init (&this->allocation_params);
       break;
     default:
       break;
@@ -528,6 +545,43 @@ gst_gdp_depay_change_state (GstElement * element, GstStateChange transition)
   return ret;
 }
 
+static void
+gst_gdp_depay_decide_allocation (GstGDPDepay * gdpdepay)
+{
+  GstAllocator *allocator;
+  GstAllocationParams params;
+  GstQuery *query = NULL;
+  GstCaps *caps;
+
+  caps = gst_pad_query_caps (gdpdepay->srcpad, NULL);
+  if (!caps) {
+    GST_LOG_OBJECT (gdpdepay,
+        "No peer pad caps found. Using default allocator.");
+    return;
+  }
+
+  query = gst_query_new_allocation (caps, TRUE);
+  if (!gst_pad_peer_query (gdpdepay->srcpad, query)) {
+    GST_WARNING_OBJECT (gdpdepay, "Peer allocation query failed.");
+  }
+
+  if (gst_query_get_n_allocation_params (query) > 0) {
+    gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
+  } else {
+    allocator = NULL;
+    gst_allocation_params_init (&params);
+  }
+
+  if (gdpdepay->allocator)
+    gst_object_unref (gdpdepay->allocator);
+
+  gdpdepay->allocator = allocator;
+  gdpdepay->allocation_params = params;
+
+  gst_caps_unref (caps);
+  gst_query_unref (query);
+}
+
 gboolean
 gst_gdp_depay_plugin_init (GstPlugin * plugin)
 {

gst/gdp/gstgdpdepay.h

@@ -68,6 +68,9 @@ struct _GstGDPDepay
   GstDPPayloadType payload_type;
 
   gint64 ts_offset;
+
+  GstAllocator *allocator;
+  GstAllocationParams allocation_params;
 };
 
 struct _GstGDPDepayClass