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/*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "mpegtsmux_h264.h"
#include <string.h>
GST_DEBUG_CATEGORY_EXTERN (mpegtsmux_debug);
#define GST_CAT_DEFAULT mpegtsmux_debug
GstBuffer *
mpegtsmux_prepare_h264 (GstBuffer * buf, MpegTsPadData * data, MpegTsMux * mux)
{
guint8 nal_length_size = 0;
guint8 startcode[4] = { 0x00, 0x00, 0x00, 0x01 };
GstBuffer *out_buf = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf) * 2);
gint offset = 4, i = 0, nb_sps = 0, nb_pps = 0;
gsize out_offset = 0, in_offset = 0;
GST_DEBUG_OBJECT (mux, "Preparing H264 buffer for output");
/* We want the same metadata */
gst_buffer_copy_metadata (out_buf, buf, GST_BUFFER_COPY_ALL);
/* Get NAL length size */
nal_length_size =
(GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + offset) & 0x03) + 1;
GST_LOG_OBJECT (mux, "NAL length will be coded on %u bytes", nal_length_size);
offset++;
/* Generate SPS */
nb_sps = GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + offset) & 0x1f;
GST_DEBUG_OBJECT (mux, "we have %d Sequence Parameter Set", nb_sps);
offset++;
/* For each SPS */
for (i = 0; i < nb_sps; i++) {
guint16 sps_size =
GST_READ_UINT16_BE (GST_BUFFER_DATA (data->codec_data) + offset);
GST_LOG_OBJECT (mux, "Sequence Parameter Set is %d bytes", sps_size);
/* Jump over SPS size */
offset += 2;
/* Fake a start code */
memcpy (GST_BUFFER_DATA (out_buf) + out_offset, startcode, 4);
out_offset += 4;
/* Now push the SPS */
memcpy (GST_BUFFER_DATA (out_buf) + out_offset,
GST_BUFFER_DATA (data->codec_data) + offset, sps_size);
out_offset += sps_size;
offset += sps_size;
}
nb_pps = GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + offset);
GST_LOG_OBJECT (mux, "we have %d Picture Parameter Set", nb_sps);
offset++;
/* For each PPS */
for (i = 0; i < nb_pps; i++) {
gint pps_size =
GST_READ_UINT16_BE (GST_BUFFER_DATA (data->codec_data) + offset);
GST_LOG_OBJECT (mux, "Picture Parameter Set is %d bytes", pps_size);
/* Jump over PPS size */
offset += 2;
/* Fake a start code */
memcpy (GST_BUFFER_DATA (out_buf) + out_offset, startcode, 4);
out_offset += 4;
/* Now push the PPS */
memcpy (GST_BUFFER_DATA (out_buf) + out_offset,
GST_BUFFER_DATA (data->codec_data) + offset, pps_size);
out_offset += pps_size;
offset += pps_size;
}
while (in_offset < GST_BUFFER_SIZE (buf) &&
out_offset < GST_BUFFER_SIZE (out_buf) - 4) {
guint32 nal_size = 0;
switch (nal_length_size) {
case 1:
nal_size = GST_READ_UINT8 (GST_BUFFER_DATA (buf) + in_offset);
break;
case 2:
nal_size = GST_READ_UINT16_BE (GST_BUFFER_DATA (buf) + in_offset);
break;
case 4:
nal_size = GST_READ_UINT32_BE (GST_BUFFER_DATA (buf) + in_offset);
break;
default:
GST_WARNING_OBJECT (mux, "unsupported NAL length size %u",
nal_length_size);
}
in_offset += nal_length_size;
/* Generate an Elementary stream buffer by inserting a startcode */
memcpy (GST_BUFFER_DATA (out_buf) + out_offset, startcode, 4);
out_offset += 4;
memcpy (GST_BUFFER_DATA (out_buf) + out_offset,
GST_BUFFER_DATA (buf) + in_offset,
MIN (nal_size, GST_BUFFER_SIZE (out_buf) - out_offset));
in_offset += nal_size;
out_offset += nal_size;
}
GST_BUFFER_SIZE (out_buf) = out_offset;
return out_buf;
}
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