From 32abd30f5ebc10cc09a1187395b7dfa3118d40e0 Mon Sep 17 00:00:00 2001
From: "Joshua M. Doe" <oss@nvl.army.mil>
Date: Wed, 14 Apr 2021 08:10:25 -0400
Subject: [PATCH] klvinject: prepare outbuf buffers to handle non-writable
 buffers

---
 gst/klv/gstklvinject.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/gst/klv/gstklvinject.c b/gst/klv/gstklvinject.c
index b9894a5..2771698 100644
--- a/gst/klv/gstklvinject.c
+++ b/gst/klv/gstklvinject.c
@@ -45,7 +45,10 @@ GST_DEBUG_CATEGORY_STATIC (gst_klvinject_debug_category);
 
 /* prototypes */
 static GstFlowReturn gst_klvinject_transform_ip (GstBaseTransform * trans,
-    GstBuffer * buf);
+    GstBuffer * inbuf);
+
+static GstFlowReturn gst_klvinject_prepare_output_buffer (GstBaseTransform *
+    trans, GstBuffer * input, GstBuffer ** outbuf);
 
 enum
 {
@@ -85,9 +88,8 @@ gst_klvinject_class_init (GstKlvInjectClass * klass)
 
   base_transform_class->transform_ip =
       GST_DEBUG_FUNCPTR (gst_klvinject_transform_ip);
-
-  base_transform_class->passthrough_on_same_caps = TRUE;
-  base_transform_class->transform_ip_on_passthrough = TRUE;
+  base_transform_class->prepare_output_buffer =
+      GST_DEBUG_FUNCPTR (gst_klvinject_prepare_output_buffer);
 }
 
 static void
@@ -189,6 +191,18 @@ gst_klvinject_add_test_meta (GstKlvInject * filt, GstBuffer * buf)
   }
 }
 
+static GstFlowReturn
+gst_klvinject_prepare_output_buffer (GstBaseTransform * trans,
+    GstBuffer * inbuf, GstBuffer ** outbuf)
+{
+  GstFlowReturn ret = GST_FLOW_OK;
+  GstKlvInject *filt = GST_KLVINJECT (trans);
+
+  *outbuf = gst_buffer_copy (inbuf);
+
+  return GST_FLOW_OK;
+}
+
 static GstFlowReturn
 gst_klvinject_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
 {