mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/*
|
|
* AAC Spectral Band Replication function declarations
|
|
* Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
|
|
* Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* AAC Spectral Band Replication function declarations
|
|
* @author Robert Swain ( rob opendot cl )
|
|
*/
|
|
|
|
#ifndef AVCODEC_AACSBR_H
|
|
#define AVCODEC_AACSBR_H
|
|
|
|
#include "get_bits.h"
|
|
#include "aac/aacdec.h"
|
|
|
|
#include "libavutil/attributes_internal.h"
|
|
|
|
#define ENVELOPE_ADJUSTMENT_OFFSET 2
|
|
#define NOISE_FLOOR_OFFSET 6
|
|
|
|
/**
|
|
* SBR VLC tables
|
|
*/
|
|
enum {
|
|
T_HUFFMAN_ENV_1_5DB,
|
|
F_HUFFMAN_ENV_1_5DB,
|
|
T_HUFFMAN_ENV_BAL_1_5DB,
|
|
F_HUFFMAN_ENV_BAL_1_5DB,
|
|
T_HUFFMAN_ENV_3_0DB,
|
|
F_HUFFMAN_ENV_3_0DB,
|
|
T_HUFFMAN_ENV_BAL_3_0DB,
|
|
F_HUFFMAN_ENV_BAL_3_0DB,
|
|
T_HUFFMAN_NOISE_3_0DB,
|
|
T_HUFFMAN_NOISE_BAL_3_0DB,
|
|
};
|
|
|
|
/**
|
|
* bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
|
|
*/
|
|
enum {
|
|
FIXFIX,
|
|
FIXVAR,
|
|
VARFIX,
|
|
VARVAR,
|
|
};
|
|
|
|
enum {
|
|
EXTENSION_ID_PS = 2,
|
|
};
|
|
|
|
FF_VISIBILITY_PUSH_HIDDEN
|
|
/** Initialize SBR. */
|
|
void ff_aac_sbr_init(void);
|
|
void ff_aac_sbr_init_fixed(void);
|
|
/**
|
|
* Allocate an ExtChannelElement (if necessary) and
|
|
* initialize the SBR context contained in it.
|
|
*/
|
|
int ff_aac_sbr_ctx_alloc_init(AACDecContext *ac, ChannelElement **che, int id_aac);
|
|
int ff_aac_sbr_ctx_alloc_init_fixed(AACDecContext *ac, ChannelElement **che, int id_aac);
|
|
|
|
/** Close the SBR context implicitly contained in a ChannelElement. */
|
|
void ff_aac_sbr_ctx_close(ChannelElement *che);
|
|
void ff_aac_sbr_ctx_close_fixed(ChannelElement *che);
|
|
|
|
/** Decode one SBR element. */
|
|
int ff_aac_sbr_decode_extension(AACDecContext *ac, ChannelElement *che,
|
|
GetBitContext *gb, int crc, int cnt, int id_aac);
|
|
int ff_aac_sbr_decode_extension_fixed(AACDecContext *ac, ChannelElement *che,
|
|
GetBitContext *gb, int crc, int cnt, int id_aac);
|
|
|
|
/** Due to channel allocation not being known upon SBR parameter transmission,
|
|
* supply the parameters separately.
|
|
* Functionally identical to ff_aac_sbr_decode_extension() */
|
|
int ff_aac_sbr_config_usac(AACDecContext *ac, ChannelElement *che,
|
|
AACUsacElemConfig *ue);
|
|
|
|
/** Decode frame SBR data, USAC. */
|
|
int ff_aac_sbr_decode_usac_data(AACDecContext *ac, ChannelElement *che,
|
|
AACUsacElemConfig *ue, GetBitContext *gb,
|
|
int sbr_ch, int indep_flag);
|
|
|
|
/** Apply one SBR element to one AAC element. */
|
|
void ff_aac_sbr_apply(AACDecContext *ac, ChannelElement *che,
|
|
int id_aac, void /* float */ *L, void /* float */ *R);
|
|
void ff_aac_sbr_apply_fixed(AACDecContext *ac, ChannelElement *che,
|
|
int id_aac, void /* int */ *L, void /* int */ *R);
|
|
|
|
FF_VISIBILITY_POP_HIDDEN
|
|
|
|
#endif /* AVCODEC_AACSBR_H */
|