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207 lines
7 KiB
C
207 lines
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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* Copyright 2008 Lin YANG <oxcsnicho@gmail.com>
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*
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* This library is licensed under 4 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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* four licenses are the MPL 1.1, the LGPL, the GPL and the MIT
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* 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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* GPL:
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, 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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*/
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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 "mpegpsmux_h264.h"
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#include <gst/base/gstbytewriter.h>
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#include <string.h>
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GST_DEBUG_CATEGORY_EXTERN (mpegpsmux_debug);
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#define GST_CAT_DEFAULT mpegpsmux_debug
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GstBuffer *
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mpegpsmux_prepare_h264 (GstBuffer * buf, MpegPsPadData * data, MpegPsMux * mux)
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{
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GstByteWriter bw;
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GstMapInfo codec_data, map;
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guint8 nal_length_size = 0;
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GstBuffer *out_buf;
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guint8 nb_sps = 0, nb_pps = 0;
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gint offset = 4, i = 0;
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gsize in_offset;
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GST_DEBUG_OBJECT (mux, "Preparing H264 buffer for output");
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/* FIXME: are we prepending SPS/PPS in front of every single buffer?
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* (should only be in front of keyframes really, if at all) */
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/* FIXME: create a byte-stream version of SPS/PPS once in set_caps */
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if (!gst_buffer_map (data->codec_data, &codec_data, GST_MAP_READ))
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return NULL;
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gst_byte_writer_init_with_size (&bw, gst_buffer_get_size (buf) * 2, FALSE);
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/* Get NAL length size */
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nal_length_size = (codec_data.data[offset] & 0x03) + 1;
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GST_LOG_OBJECT (mux, "NAL length will be coded on %u bytes", nal_length_size);
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offset++;
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/* Generate SPS */
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nb_sps = codec_data.data[offset] & 0x1f;
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GST_DEBUG_OBJECT (mux, "we have %d Sequence Parameter Set", nb_sps);
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offset++;
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/* For each SPS */
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for (i = 0; i < nb_sps; i++) {
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guint16 sps_size = GST_READ_UINT16_BE (codec_data.data + offset);
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GST_LOG_OBJECT (mux, "Sequence Parameter Set is %d bytes", sps_size);
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/* Jump over SPS size */
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offset += 2;
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/* Fake a start code */
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gst_byte_writer_put_uint32_be (&bw, 0x00000001);
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/* Now push the SPS */
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gst_byte_writer_put_data (&bw, codec_data.data + offset, sps_size);
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offset += sps_size;
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}
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nb_pps = codec_data.data[offset];
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GST_LOG_OBJECT (mux, "we have %d Picture Parameter Set", nb_sps);
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offset++;
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/* For each PPS */
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for (i = 0; i < nb_pps; i++) {
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gint pps_size = GST_READ_UINT16_BE (codec_data.data + offset);
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GST_LOG_OBJECT (mux, "Picture Parameter Set is %d bytes", pps_size);
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/* Jump over PPS size */
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offset += 2;
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/* Fake a start code */
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gst_byte_writer_put_uint32_be (&bw, 0x00000001);
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/* Now push the PPS */
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gst_byte_writer_put_data (&bw, codec_data.data + offset, pps_size);
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offset += pps_size;
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}
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gst_buffer_unmap (data->codec_data, &codec_data);
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if (!gst_buffer_map (buf, &map, GST_MAP_READ))
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return NULL;
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/* now process NALs and change them to byte-stream format */
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in_offset = 0;
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while (in_offset < map.size) {
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guint32 nal_size = 0;
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switch (nal_length_size) {
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case 1:
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nal_size = GST_READ_UINT8 (map.data + in_offset);
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break;
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case 2:
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nal_size = GST_READ_UINT16_BE (map.data + in_offset);
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break;
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case 4:
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nal_size = GST_READ_UINT32_BE (map.data + in_offset);
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break;
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default:
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GST_WARNING_OBJECT (mux, "unsupported NAL length size %u",
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nal_length_size);
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break;
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}
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in_offset += nal_length_size;
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/* Generate an Elementary stream buffer by inserting a startcode */
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gst_byte_writer_put_uint32_be (&bw, 0x00000001);
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gst_byte_writer_put_data (&bw, map.data + in_offset,
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MIN (nal_size, map.size - in_offset));
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in_offset += nal_size;
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}
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out_buf = gst_byte_writer_reset_and_get_buffer (&bw);
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/* We want the same metadata */
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gst_buffer_copy_into (out_buf, buf, GST_BUFFER_COPY_METADATA, 0, 0);
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return out_buf;
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}
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