| /* |
| * Copyright 2006, 2007, 2008 Fluendo S.A. |
| * Authors: Jan Schmidt <jan@fluendo.com> |
| * Kapil Agrawal <kapil@fluendo.com> |
| * Julien Moutte <julien@fluendo.com> |
| * |
| * Copyright 2008 Lin YANG <oxcsnicho@gmail.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 "mpegpsmux_h264.h" |
| #include <gst/base/gstbytewriter.h> |
| #include <string.h> |
| |
| 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; |
| } |
| |
| 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; |
| } |