/* * Copyright 2006, 2007, 2008 Fluendo S.A. * Authors: Jan Schmidt * Kapil Agrawal * Julien Moutte * * Copyright 2008 Lin YANG * * This library is licensed under 3 different licenses and you * can choose to use it under the terms of any one of them. The * three licenses are the MPL 1.1, the LGPL 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. * * 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. * * SPDX-License-Identifier: MPL-1.1 OR MIT OR LGPL-2.0-or-later */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "mpegpsmux_h264.h" #include #include GST_DEBUG_CATEGORY_EXTERN (mpegpsmux_debug); #define GST_CAT_DEFAULT mpegpsmux_debug GstBuffer * mpegpsmux_prepare_h264 (GstBuffer * buf, MpegPsPadData * data, MpegPsMux * mux) { GstByteWriter bw; GstMapInfo codec_data, map; guint8 nal_length_size = 0; GstBuffer *out_buf; guint8 nb_sps = 0, nb_pps = 0; gint offset = 4, i = 0; gsize in_offset; GST_DEBUG_OBJECT (mux, "Preparing H264 buffer for output"); /* FIXME: are we prepending SPS/PPS in front of every single buffer? * (should only be in front of keyframes really, if at all) */ /* FIXME: create a byte-stream version of SPS/PPS once in set_caps */ if (!gst_buffer_map (data->codec_data, &codec_data, GST_MAP_READ)) return NULL; gst_byte_writer_init_with_size (&bw, gst_buffer_get_size (buf) * 2, FALSE); /* Get NAL length size */ nal_length_size = (codec_data.data[offset] & 0x03) + 1; GST_LOG_OBJECT (mux, "NAL length will be coded on %u bytes", nal_length_size); offset++; /* Generate SPS */ nb_sps = codec_data.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 (codec_data.data + offset); GST_LOG_OBJECT (mux, "Sequence Parameter Set is %d bytes", sps_size); /* Jump over SPS size */ offset += 2; /* Fake a start code */ gst_byte_writer_put_uint32_be (&bw, 0x00000001); /* Now push the SPS */ gst_byte_writer_put_data (&bw, codec_data.data + offset, sps_size); offset += sps_size; } nb_pps = codec_data.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 (codec_data.data + offset); GST_LOG_OBJECT (mux, "Picture Parameter Set is %d bytes", pps_size); /* Jump over PPS size */ offset += 2; /* Fake a start code */ gst_byte_writer_put_uint32_be (&bw, 0x00000001); /* Now push the PPS */ gst_byte_writer_put_data (&bw, codec_data.data + offset, pps_size); offset += pps_size; } gst_buffer_unmap (data->codec_data, &codec_data); if (!gst_buffer_map (buf, &map, GST_MAP_READ)) return NULL; /* now process NALs and change them to byte-stream format */ in_offset = 0; while (in_offset < map.size) { guint32 nal_size = 0; switch (nal_length_size) { case 1: nal_size = GST_READ_UINT8 (map.data + in_offset); break; case 2: nal_size = GST_READ_UINT16_BE (map.data + in_offset); break; case 4: nal_size = GST_READ_UINT32_BE (map.data + in_offset); break; default: GST_WARNING_OBJECT (mux, "unsupported NAL length size %u", nal_length_size); break; } in_offset += nal_length_size; /* Generate an Elementary stream buffer by inserting a startcode */ gst_byte_writer_put_uint32_be (&bw, 0x00000001); gst_byte_writer_put_data (&bw, map.data + in_offset, MIN (nal_size, map.size - in_offset)); in_offset += nal_size; } gst_buffer_unmap (buf, &map); out_buf = gst_byte_writer_reset_and_get_buffer (&bw); /* We want the same metadata */ gst_buffer_copy_into (out_buf, buf, GST_BUFFER_COPY_METADATA, 0, 0); return out_buf; }