gst/mpegtsparse/: Added descriptor searching infrastructure from Fluendo TS demuxer.

Original commit message from CVS:
* gst/mpegtsparse/Makefile.am:
* gst/mpegtsparse/gstmpegdesc.c:
* gst/mpegtsparse/gstmpegdesc.h:
* gst/mpegtsparse/mpegtspacketizer.c:
* gst/mpegtsparse/mpegtsparse.c:
Added descriptor searching infrastructure from Fluendo TS demuxer.
Add channel name and provider to the sdt structure sent in the
bus message.

1 files changed, 198 insertions, 0 deletions

diff --git a/gst/mpegtsparse/gstmpegdesc.c b/gst/mpegtsparse/gstmpegdesc.c
new file mode 100644
index 00000000..9a4e1195
--- /dev/null
+++ b/gst/mpegtsparse/gstmpegdesc.c
@@ -0,0 +1,198 @@
+/* 
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Fluendo MPEG Demuxer plugin.
+ *
+ * The Initial Developer of the Original Code is Fluendo, S.L.
+ * Portions created by Fluendo, S.L. are Copyright (C) 2005
+ * Fluendo, S.L. All Rights Reserved.
+ *
+ * Contributor(s): Wim Taymans <wim@fluendo.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU Lesser General Public License Version 2 or later (the "LGPL"),
+ * in which case the provisions of the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of the MPL or the LGPL.
+ */
+
+#include <string.h>
+
+#include <gst/gst.h>
+
+#include "gstmpegdesc.h"
+
+GST_DEBUG_CATEGORY (gstflumpegdesc_debug);
+#define GST_CAT_DEFAULT (gstflumpegdesc_debug)
+
+void
+gst_mpeg_descriptor_free (GstMPEGDescriptor * desc)
+{
+  g_return_if_fail (desc != NULL);
+
+  g_free (desc);
+}
+
+static guint
+gst_mpeg_descriptor_parse_1 (guint8 * data, guint size)
+{
+  guint8 tag;
+  guint8 length;
+
+  /* need at least 2 bytes for tag and length */
+  if (size < 2)
+    return 0;
+
+  tag = *data++;
+  length = *data++;
+  size -= 2;
+
+  GST_DEBUG ("tag: 0x%02x, length: %d", tag, length);
+
+  if (length > size)
+    return 0;
+
+  return length + 2;;
+}
+
+GstMPEGDescriptor *
+gst_mpeg_descriptor_parse (guint8 * data, guint size)
+{
+  guint8 *current;
+  guint consumed, total, n_desc;
+  GstMPEGDescriptor *result;
+
+  g_return_val_if_fail (data != NULL, NULL);
+
+  current = data;
+  total = 0;
+  n_desc = 0;
+
+  do {
+    consumed = gst_mpeg_descriptor_parse_1 (current, size);
+
+    if (consumed > 0) {
+      current += consumed;
+      total += consumed;
+      size -= consumed;
+      n_desc++;
+    }
+  }
+  while (consumed > 0);
+
+  GST_DEBUG ("parsed %d descriptors", n_desc);
+
+  if (total == 0)
+    return NULL;
+
+  result = g_malloc (sizeof (GstMPEGDescriptor) + total);
+  result->n_desc = n_desc;
+  result->data_length = total;
+  result->data = ((guint8 *) result) + sizeof (GstMPEGDescriptor);
+
+  memcpy (result->data, data, total);
+
+  return result;
+}
+
+guint
+gst_mpeg_descriptor_n_desc (GstMPEGDescriptor * desc)
+{
+  g_return_val_if_fail (desc != NULL, 0);
+
+  return desc->n_desc;
+}
+
+guint8 *
+gst_mpeg_descriptor_find (GstMPEGDescriptor * desc, gint tag)
+{
+  gint length;
+  guint8 *current;
+  guint size;
+
+  g_return_val_if_fail (desc != NULL, NULL);
+
+  current = desc->data;
+  length = desc->data_length;
+
+  while (length > 0) {
+    if (DESC_TAG (current) == tag)
+      return current;
+
+    size = DESC_LENGTH (current) + 2;
+
+    current += size;
+    length -= size;
+  }
+  return NULL;
+}
+
+/* array needs freeing afterwards */
+GArray *
+gst_mpeg_descriptor_find_all (GstMPEGDescriptor * desc, gint tag)
+{
+  GArray *all;
+
+  gint length;
+  guint8 *current;
+  guint size;
+
+  g_return_val_if_fail (desc != NULL, NULL);
+  all = g_array_new (TRUE, TRUE, sizeof (guint8 *));
+
+  current = desc->data;
+  length = desc->data_length;
+
+  while (length > 0) {
+    if (DESC_TAG (current) == tag)
+      g_array_append_val (all, current);
+    size = DESC_LENGTH (current) + 2;
+
+    current += size;
+    length -= size;
+  }
+
+  return all;
+}
+
+guint8 *
+gst_mpeg_descriptor_nth (GstMPEGDescriptor * desc, guint i)
+{
+  gint length;
+  guint8 *current;
+  guint size;
+
+  g_return_val_if_fail (desc != NULL, NULL);
+
+  if (i > desc->n_desc)
+    return NULL;
+
+  current = desc->data;
+  length = desc->data_length;
+
+  while (length > 0) {
+    if (i == 0)
+      return current;
+
+    size = DESC_LENGTH (current) + 2;
+
+    current += size;
+    length -= size;
+    i--;
+
+  }
+  return NULL;
+}