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96 lines
3 KiB
C
96 lines
3 KiB
C
/*
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* AAC Spectral Band Replication function declarations
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* Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
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* Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* AAC Spectral Band Replication function declarations
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* @author Robert Swain ( rob opendot cl )
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*/
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#ifndef AVCODEC_AACSBR_H
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#define AVCODEC_AACSBR_H
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#include "get_bits.h"
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#include "aac.h"
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#include "sbr.h"
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#define ENVELOPE_ADJUSTMENT_OFFSET 2
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#define NOISE_FLOOR_OFFSET 6
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/**
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* SBR VLC tables
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*/
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enum {
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T_HUFFMAN_ENV_1_5DB,
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F_HUFFMAN_ENV_1_5DB,
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T_HUFFMAN_ENV_BAL_1_5DB,
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F_HUFFMAN_ENV_BAL_1_5DB,
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T_HUFFMAN_ENV_3_0DB,
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F_HUFFMAN_ENV_3_0DB,
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T_HUFFMAN_ENV_BAL_3_0DB,
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F_HUFFMAN_ENV_BAL_3_0DB,
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T_HUFFMAN_NOISE_3_0DB,
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T_HUFFMAN_NOISE_BAL_3_0DB,
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};
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/**
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* bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
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*/
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enum {
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FIXFIX,
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FIXVAR,
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VARFIX,
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VARVAR,
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};
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enum {
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EXTENSION_ID_PS = 2,
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};
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static const int8_t vlc_sbr_lav[10] =
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{ 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
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#define SBR_INIT_VLC_STATIC(num, size) \
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INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \
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sbr_tmp[num].sbr_bits , 1, 1, \
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sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
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size)
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#define SBR_VLC_ROW(name) \
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{ name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
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/** Initialize SBR. */
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void AAC_RENAME(ff_aac_sbr_init)(void);
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/** Initialize one SBR context. */
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void AAC_RENAME(ff_aac_sbr_ctx_init)(AACContext *ac, SpectralBandReplication *sbr, int id_aac);
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/** Close one SBR context. */
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void AAC_RENAME(ff_aac_sbr_ctx_close)(SpectralBandReplication *sbr);
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/** Decode one SBR element. */
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int AAC_RENAME(ff_decode_sbr_extension)(AACContext *ac, SpectralBandReplication *sbr,
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GetBitContext *gb, int crc, int cnt, int id_aac);
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/** Apply one SBR element to one AAC element. */
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void AAC_RENAME(ff_sbr_apply)(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
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INTFLOAT* L, INTFLOAT *R);
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void ff_aacsbr_func_ptr_init_mips(AACSBRContext *c);
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#endif /* AVCODEC_AACSBR_H */
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