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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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140 lines
4.7 KiB
C
140 lines
4.7 KiB
C
/*
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* Copyright 2006, 2007, 2008 Fluendo S.A.
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* Authors: Jan Schmidt <jan@fluendo.com>
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* Kapil Agrawal <kapil@fluendo.com>
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* Julien Moutte <julien@fluendo.com>
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*
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* This library is licensed under 3 different licenses and you
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* can choose to use it under the terms of any one of them. The
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* three licenses are the MPL 1.1, the LGPL and the MIT license.
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*
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* MPL:
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/.
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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* License for the specific language governing rights and limitations
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* under the License.
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*
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* LGPL:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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* MIT:
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*
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* Unless otherwise indicated, Source Code is licensed under MIT license.
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* See further explanation attached in License Statement (distributed in the file
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* LICENSE).
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* SPDX-License-Identifier: MPL-1.1 OR MIT OR LGPL-2.0-or-later
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstbasetsmuxttxt.h"
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#include <string.h>
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#define GST_CAT_DEFAULT gst_base_ts_mux_debug
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/* from EN 300 472 spec: ITU-R System B Teletext in DVB
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*
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* PES packet = PES header + PES payload data
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* where PES header must be fixed at 45 bytes (likely by using PES stuffing)
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* PES packet must completely fill an integral number of TS packets
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* using (184 bytes) payload data only (so no adaptation field stuffing)
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*/
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GstBuffer *
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gst_base_ts_mux_prepare_teletext (GstBuffer * buf, GstBaseTsMuxPad * pad,
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GstBaseTsMux * mux)
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{
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GstBuffer *out_buf;
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guint8 *data, *odata;
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gint size, stuff;
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gboolean add_id = FALSE;
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GstMapInfo map, omap;
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gst_buffer_map (buf, &map, GST_MAP_READ);
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size = map.size;
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data = map.data;
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/* check if leading data_identifier byte is already present,
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* if not increase size since it will need to be added */
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if (data[0] < 0x10 || data[0] > 0x1F) {
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size += 1;
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add_id = TRUE;
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}
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if (size <= 184 - 45) {
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stuff = 184 - 45 - size;
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} else {
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stuff = size - (184 - 45);
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stuff = 184 - (stuff % 184);
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}
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if (G_UNLIKELY (stuff == 1))
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stuff += 184;
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GST_DEBUG_OBJECT (mux, "Preparing teletext buffer for output");
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out_buf = gst_buffer_new_and_alloc (size + stuff);
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gst_buffer_copy_into (out_buf, buf,
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GST_BUFFER_COPY_METADATA | GST_BUFFER_COPY_TIMESTAMPS, 0, 0);
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/* copy data */
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gst_buffer_map (out_buf, &omap, GST_MAP_WRITE);
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odata = omap.data;
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/* add data_identifier if needed */
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if (add_id) {
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*odata = 0x10;
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memcpy (odata + 1, data, size - 1);
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} else {
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memcpy (odata, data, size);
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}
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/* add stuffing data_unit */
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odata += size;
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*odata++ = 0xFF;
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*odata = stuff;
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gst_buffer_unmap (buf, &map);
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gst_buffer_unmap (out_buf, &omap);
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return out_buf;
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}
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