buffer: add gst_buffer_new_copy() convenience function

More convenient and discoverable variant of the fairly widely-used
gst_buffer_new_wrapped(g_memdup(data,size),size).

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/826>

gst/gstbuffer.c

@@ -1039,6 +1039,25 @@ gst_buffer_new_wrapped_bytes (GBytes * bytes)
       size, 0, size, g_bytes_ref (bytes), (GDestroyNotify) g_bytes_unref);
 }
 
+/**
+ * gst_buffer_new_copy:
+ * @data: (array length=size) (element-type guint8) (transfer none): data to copy into new buffer
+ * @size: size of @data in bytes
+ *
+ * Creates a new buffer of size @size and fills it with a copy of @data.
+ *
+ * Returns: (transfer full): a new #GstBuffer
+ *
+ * Since: 1.20
+ */
+GstBuffer *
+gst_buffer_new_copy (gconstpointer data, gsize size)
+{
+  gpointer data2 = g_memdup (data, size);
+
+  return gst_buffer_new_wrapped_full (0, data2, size, 0, size, data2, g_free);
+}
+
 /**
  * gst_buffer_n_memory:
  * @buffer: a #GstBuffer.

gst/gstbuffer.h

@@ -314,9 +314,13 @@ GstBuffer * gst_buffer_new_wrapped_full    (GstMemoryFlags flags, gpointer data,
                                             GDestroyNotify notify);
 GST_API
 GstBuffer * gst_buffer_new_wrapped         (gpointer data, gsize size);
+
 GST_API
 GstBuffer * gst_buffer_new_wrapped_bytes   (GBytes * bytes);
 
+GST_API
+GstBuffer * gst_buffer_new_copy            (gconstpointer data, gsize size);
+
 /* memory blocks */
 
 GST_API

tests/check/gst/gstbuffer.c

@@ -923,6 +923,27 @@ GST_START_TEST (test_wrapped_bytes)
 
 GST_END_TEST;
 
+GST_START_TEST (test_new_copy)
+{
+  GstBuffer *buf;
+  GstMemory *mem;
+
+  buf = gst_buffer_new_copy (ro_memory, sizeof (ro_memory));
+
+  fail_if (gst_buffer_memcmp (buf, 0, ro_memory, sizeof (ro_memory)));
+  fail_unless_equals_int (gst_buffer_get_size (buf), sizeof (ro_memory));
+
+  /* the memory should be writable */
+  mem = gst_buffer_peek_memory (buf, 0);
+  fail_unless (gst_memory_is_writable (mem));
+  fail_unless (gst_buffer_is_writable (buf));
+  gst_buffer_memset (buf, 0, 0xaa, sizeof (ro_memory));
+
+  gst_buffer_unref (buf);
+}
+
+GST_END_TEST;
+
 static Suite *
 gst_buffer_suite (void)
 {
@@ -948,6 +969,7 @@ gst_buffer_suite (void)
   tcase_add_test (tc_chain, test_parent_buffer_meta);
   tcase_add_test (tc_chain, test_writable_memory);
   tcase_add_test (tc_chain, test_wrapped_bytes);
+  tcase_add_test (tc_chain, test_new_copy);
 
   return s;
 }