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G.729 decoder main code

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(just skeleton, contains only parts, explicitly ok'ed by Michael)

Originally committed as revision 14800 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vladimir Voroshilov 2008-08-17 08:43:37 +00:00
parent 720d52c678
commit 5209846850
2 changed files with 104 additions and 0 deletions
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52
libavcodec/g729.h Normal file
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/*
* G.729 decoder
* Copyright (c) 2008 Vladimir Voroshilov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef FFMPEG_G729_H
#define FFMPEG_G729_H
#include <stdint.h>
/// Moving Average (MA) prediction order
#define MA_NP 4
/**
* minimum quantized LSF value (3.2.4)
* 0.005 in Q13
*/
#define LSFQ_MIN 40
/**
* maximum quantized LSF value (3.2.4)
* 3.135 in Q13
*/
#define LSFQ_MAX 25681
/**
* minimum LSF distance (3.2.4)
* 0.0391 in Q13
*/
#define LSFQ_DIFF_MIN 321
/**
* maximum possible subframe size
*/
#define MAX_SUBFRAME_SIZE 44
#endif // FFMPEG_G729_H

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libavcodec/g729dec.c Normal file
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/*
* G.729 decoder
* Copyright (c) 2008 Vladimir Voroshilov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include "avcodec.h"
#include "libavutil/avutil.h"
#include "bitstream.h"
/**
* \brief pseudo random number generator
*/
static inline uint16_t g729_random(uint16_t value)
{
return 31821 * value + 13849;
}
AVCodec g729_decoder =
{
"g729",
CODEC_TYPE_AUDIO,
CODEC_ID_G729,
sizeof(G729_Context),
ff_g729_decoder_init,
NULL,
NULL,
ff_g729_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("G.729"),
};