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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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* Copyright 2008 Lin YANG <oxcsnicho@gmail.com>
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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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* 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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* 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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* 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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* 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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* 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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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* 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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* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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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* 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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* 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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* 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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#include "mpegpsmux_aac.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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mpegpsmux_prepare_aac (GstBuffer * buf, MpegPsPadData * data, MpegPsMux * mux)
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guint8 adts_header[7] = { 0, };
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GstBuffer *out_buf = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf) + 7);
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gsize out_offset = 0;
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guint8 rate_idx = 0, channels = 0, obj_type = 0;
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GST_DEBUG_OBJECT (mux, "Preparing AAC buffer for output");
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/* We want the same metadata */
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gst_buffer_copy_metadata (out_buf, buf, GST_BUFFER_COPY_ALL);
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/* Generate ADTS header */
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obj_type = (GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data)) & 0xC) >> 2;
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rate_idx = (GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data)) & 0x3) << 1;
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(GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + 1) & 0x80) >> 7;
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(GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + 1) & 0x78) >> 3;
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GST_DEBUG_OBJECT (mux, "Rate index %u, channels %u, object type %u", rate_idx,
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/* Sync point over a full byte */
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adts_header[0] = 0xFF;
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/* Sync point continued over first 4 bits + static 4 bits
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* (ID, layer, protection)*/
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adts_header[1] = 0xF1;
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/* Object type over first 2 bits */
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adts_header[2] = obj_type << 6;
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/* rate index over next 4 bits */
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adts_header[2] |= (rate_idx << 2);
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/* channels over last 2 bits */
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adts_header[2] |= (channels & 0x4) >> 2;
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/* channels continued over next 2 bits + 4 bits at zero */
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adts_header[3] = (channels & 0x3) << 6;
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/* frame size over last 2 bits */
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adts_header[3] |= (GST_BUFFER_SIZE (out_buf) & 0x1800) >> 11;
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/* frame size continued over full byte */
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adts_header[4] = (GST_BUFFER_SIZE (out_buf) & 0x1FF8) >> 3;
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/* frame size continued first 3 bits */
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adts_header[5] = (GST_BUFFER_SIZE (out_buf) & 0x7) << 5;
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/* buffer fullness (0x7FF for VBR) over 5 last bits */
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adts_header[5] |= 0x1F;
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/* buffer fullness (0x7FF for VBR) continued over 6 first bits + 2 zeros for
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* number of raw data blocks */
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adts_header[6] = 0xFC;
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/* Insert ADTS header */
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memcpy (GST_BUFFER_DATA (out_buf) + out_offset, adts_header, 7);
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/* Now copy complete frame */
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memcpy (GST_BUFFER_DATA (out_buf) + out_offset, GST_BUFFER_DATA (buf),
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GST_BUFFER_SIZE (buf));
added
removed
gst/mpegpsmux/mpegpsmux_aac.c
