1 files changed, 156 insertions, 0 deletions
diff --git a/gst/mpegtsmux/basetsmux_ttxt.c b/gst/mpegtsmux/basetsmux_ttxt.c
new file mode 100644
index 000000000..edaf528f9
--- /dev/null
+++ b/gst/mpegtsmux/basetsmux_ttxt.c
@@ -0,0 +1,156 @@
+/* 
+ * Copyright 2006, 2007, 2008 Fluendo S.A. 
+ *  Authors: Jan Schmidt <jan@fluendo.com>
+ *           Kapil Agrawal <kapil@fluendo.com>
+ *           Julien Moutte <julien@fluendo.com>
+ *
+ * This library is licensed under 4 different licenses and you
+ * can choose to use it under the terms of any one of them. The
+ * four licenses are the MPL 1.1, the LGPL, the GPL and the MIT
+ * license.
+ *
+ * MPL:
+ * 
+ * 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.
+ *
+ * LGPL:
+ *
+ * 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., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ * GPL:
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * MIT:
+ *
+ * Unless otherwise indicated, Source Code is licensed under MIT license.
+ * See further explanation attached in License Statement (distributed in the file
+ * LICENSE).
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "basetsmux_ttxt.h"
+#include <string.h>
+
+#define GST_CAT_DEFAULT basetsmux_debug
+
+/* from EN 300 472 spec: ITU-R System B Teletext in DVB
+ *
+ * PES packet = PES header + PES payload data
+ *  where PES header must be fixed at 45 bytes (likely by using PES stuffing)
+ * PES packet must completely fill an integral number of TS packets
+ *  using (184 bytes) payload data only (so no adaptation field stuffing)
+ */
+
+GstBuffer *
+basetsmux_prepare_teletext (GstBuffer * buf, BaseTsPadData * pad_data,
+    BaseTsMux * mux)
+{
+  GstBuffer *out_buf;
+  guint8 *data, *odata;
+  gint size, stuff;
+  gboolean add_id = FALSE;
+  GstMapInfo map, omap;
+
+  gst_buffer_map (buf, &map, GST_MAP_READ);
+  size = map.size;
+  data = map.data;
+
+  /* check if leading data_identifier byte is already present,
+   * if not increase size since it will need to be added */
+  if (data[0] < 0x10 || data[0] > 0x1F) {
+    size += 1;
+    add_id = TRUE;
+  }
+
+  if (size <= 184 - 45) {
+    stuff = 184 - 45 - size;
+  } else {
+    stuff = size - (184 - 45);
+    stuff = 184 - (stuff % 184);
+  }
+  if (G_UNLIKELY (stuff == 1))
+    stuff += 184;
+
+  GST_DEBUG_OBJECT (mux, "Preparing teletext buffer for output");
+
+  out_buf = gst_buffer_new_and_alloc (size + stuff);
+  gst_buffer_copy_into (out_buf, buf,
+      GST_BUFFER_COPY_METADATA | GST_BUFFER_COPY_TIMESTAMPS, 0, 0);
+
+  /* copy data */
+  gst_buffer_map (out_buf, &omap, GST_MAP_WRITE);
+  odata = omap.data;
+  /* add data_identifier if needed */
+  if (add_id) {
+    *odata = 0x10;
+    memcpy (odata + 1, data, size - 1);
+  } else {
+    memcpy (odata, data, size);
+  }
+
+  /* add stuffing data_unit */
+  odata += size;
+  *odata++ = 0xFF;
+  *odata = stuff;
+
+  gst_buffer_unmap (buf, &map);
+  gst_buffer_unmap (out_buf, &omap);
+
+  return out_buf;
+}