/* * Copyright 2006, 2007, 2008 Fluendo S.A. * Authors: Jan Schmidt * Kapil Agrawal * Julien Moutte * * Copyright 2008 Lin YANG * * 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_aac.h" #include GST_DEBUG_CATEGORY_EXTERN (mpegpsmux_debug); #define GST_CAT_DEFAULT mpegpsmux_debug GstBuffer * mpegpsmux_prepare_aac (GstBuffer * buf, MpegPsPadData * data, MpegPsMux * mux) { guint8 adts_header[7] = { 0, }; GstBuffer *out_buf = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf) + 7); gsize out_offset = 0; guint8 rate_idx = 0, channels = 0, obj_type = 0; GST_DEBUG_OBJECT (mux, "Preparing AAC buffer for output"); /* We want the same metadata */ gst_buffer_copy_metadata (out_buf, buf, GST_BUFFER_COPY_ALL); /* Generate ADTS header */ obj_type = (GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data)) & 0xC) >> 2; obj_type++; rate_idx = (GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data)) & 0x3) << 1; rate_idx |= (GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + 1) & 0x80) >> 7; channels = (GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + 1) & 0x78) >> 3; GST_DEBUG_OBJECT (mux, "Rate index %u, channels %u, object type %u", rate_idx, channels, obj_type); /* Sync point over a full byte */ adts_header[0] = 0xFF; /* Sync point continued over first 4 bits + static 4 bits * (ID, layer, protection)*/ adts_header[1] = 0xF1; /* Object type over first 2 bits */ adts_header[2] = obj_type << 6; /* rate index over next 4 bits */ adts_header[2] |= (rate_idx << 2); /* channels over last 2 bits */ adts_header[2] |= (channels & 0x4) >> 2; /* channels continued over next 2 bits + 4 bits at zero */ adts_header[3] = (channels & 0x3) << 6; /* frame size over last 2 bits */ adts_header[3] |= (GST_BUFFER_SIZE (out_buf) & 0x1800) >> 11; /* frame size continued over full byte */ adts_header[4] = (GST_BUFFER_SIZE (out_buf) & 0x1FF8) >> 3; /* frame size continued first 3 bits */ adts_header[5] = (GST_BUFFER_SIZE (out_buf) & 0x7) << 5; /* buffer fullness (0x7FF for VBR) over 5 last bits */ adts_header[5] |= 0x1F; /* buffer fullness (0x7FF for VBR) continued over 6 first bits + 2 zeros for * number of raw data blocks */ adts_header[6] = 0xFC; /* Insert ADTS header */ memcpy (GST_BUFFER_DATA (out_buf) + out_offset, adts_header, 7); out_offset += 7; /* Now copy complete frame */ memcpy (GST_BUFFER_DATA (out_buf) + out_offset, GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf)); return out_buf; }