mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
110 lines
3.5 KiB
110 lines
3.5 KiB
/* |
|
* 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 */
|
|
|