1 files changed, 152 insertions, 0 deletions
diff --git a/gst/gstmeta.c b/gst/gstmeta.c
new file mode 100644
index 0000000000..ae0f77ea1a
--- /dev/null
+++ b/gst/gstmeta.c
@@ -0,0 +1,152 @@
+/* GStreamer
+ * Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * gstmeta.c: metadata operations
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:gstmeta
+ * @short_description: Buffer metadata
+ *
+ * Last reviewed on December 17th, 2009 (0.10.26)
+ */
+#include "gst_private.h"
+
+#include "gstbuffer.h"
+#include "gstmeta.h"
+#include "gstinfo.h"
+#include "gstutils.h"
+
+static GHashTable *metainfo = NULL;
+static GStaticRWLock lock = G_STATIC_RW_LOCK_INIT;
+
+void
+_gst_meta_init (void)
+{
+  metainfo = g_hash_table_new (g_str_hash, g_str_equal);
+}
+
+/**
+ * gst_meta_register_info:
+ * @info: a #GstMetaInfo
+ *
+ * Register a #GstMetaInfo. The same @info can be retrieved later with
+ * gst_meta_get_info() by using @impl as the key.
+ *
+ * Returns: a #GstMetaInfo that can be used to access metadata.
+ */
+
+const GstMetaInfo *
+gst_meta_register (const gchar * api, const gchar * impl, gsize size,
+    GstMetaInitFunction init_func, GstMetaFreeFunction free_func,
+    GstMetaCopyFunction copy_func, GstMetaTransformFunction transform_func)
+{
+  GstMetaInfo *info;
+
+  g_return_val_if_fail (api != NULL, NULL);
+  g_return_val_if_fail (impl != NULL, NULL);
+  g_return_val_if_fail (size != 0, NULL);
+
+  info = g_slice_new (GstMetaInfo);
+  info->api = g_quark_from_string (api);
+  info->type = g_pointer_type_register_static (impl);
+  info->size = size;
+  info->init_func = init_func;
+  info->free_func = free_func;
+  info->copy_func = copy_func;
+  info->transform_func = transform_func;
+
+  GST_DEBUG ("register \"%s\" implementing \"%s\" of size %" G_GSIZE_FORMAT,
+      api, impl, size);
+
+  g_static_rw_lock_writer_lock (&lock);
+  g_hash_table_insert (metainfo, (gpointer) impl, (gpointer) info);
+  g_static_rw_lock_writer_unlock (&lock);
+
+  return info;
+}
+
+/**
+ * gst_meta_get_info:
+ * @impl: the name
+ *
+ * Lookup a previously registered meta info structure by its implementor name
+ * @impl.
+ *
+ * Returns: a #GstMetaInfo with @impl or #NULL when no such metainfo
+ * exists.
+ */
+const GstMetaInfo *
+gst_meta_get_info (const gchar * impl)
+{
+  GstMetaInfo *info;
+
+  g_return_val_if_fail (impl != NULL, NULL);
+
+  g_static_rw_lock_reader_lock (&lock);
+  info = g_hash_table_lookup (metainfo, impl);
+  g_static_rw_lock_reader_unlock (&lock);
+
+  return info;
+}
+
+/* Timing metadata */
+static void
+meta_timing_copy (GstBuffer * copybuf, GstMetaTiming * meta,
+    GstBuffer * buffer, gsize offset, gsize size)
+{
+  GstMetaTiming *timing;
+
+  GST_DEBUG ("trans called from buffer %p to %p, meta %p, %u-%u", buffer,
+      copybuf, meta, offset, size);
+
+  timing = gst_buffer_add_meta_timing (copybuf);
+  if (offset == 0) {
+    /* same offset, copy timestamps */
+    timing->pts = meta->pts;
+    timing->dts = meta->dts;
+    if (size == gst_buffer_get_size (buffer)) {
+      /* same size, copy duration */
+      timing->duration = meta->duration;
+    } else {
+      /* else clear */
+      timing->duration = GST_CLOCK_TIME_NONE;
+    }
+  } else {
+    timing->pts = -1;
+    timing->dts = -1;
+    timing->duration = -1;
+  }
+  timing->clock_rate = meta->clock_rate;
+}
+
+const GstMetaInfo *
+gst_meta_timing_get_info (void)
+{
+  static const GstMetaInfo *meta_info = NULL;
+
+  if (meta_info == NULL) {
+    meta_info = gst_meta_register ("GstMetaTiming", "GstMetaTiming",
+        sizeof (GstMetaTiming),
+        (GstMetaInitFunction) NULL,
+        (GstMetaFreeFunction) NULL,
+        (GstMetaCopyFunction) meta_timing_copy,
+        (GstMetaTransformFunction) NULL);
+  }
+  return meta_info;
+}