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111 lines
3.5 KiB
C
111 lines
3.5 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/aacdec.h"
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#include "libavutil/attributes_internal.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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FF_VISIBILITY_PUSH_HIDDEN
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/** Initialize SBR. */
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void ff_aac_sbr_init(void);
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void ff_aac_sbr_init_fixed(void);
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/**
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* Allocate an ExtChannelElement (if necessary) and
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* initialize the SBR context contained in it.
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*/
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int ff_aac_sbr_ctx_alloc_init(AACDecContext *ac, ChannelElement **che, int id_aac);
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int ff_aac_sbr_ctx_alloc_init_fixed(AACDecContext *ac, ChannelElement **che, int id_aac);
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/** Close the SBR context implicitly contained in a ChannelElement. */
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void ff_aac_sbr_ctx_close(ChannelElement *che);
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void ff_aac_sbr_ctx_close_fixed(ChannelElement *che);
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/** Decode one SBR element. */
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int ff_aac_sbr_decode_extension(AACDecContext *ac, ChannelElement *che,
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GetBitContext *gb, int crc, int cnt, int id_aac);
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int ff_aac_sbr_decode_extension_fixed(AACDecContext *ac, ChannelElement *che,
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GetBitContext *gb, int crc, int cnt, int id_aac);
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/** Due to channel allocation not being known upon SBR parameter transmission,
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* supply the parameters separately.
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* Functionally identical to ff_aac_sbr_decode_extension() */
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int ff_aac_sbr_config_usac(AACDecContext *ac, ChannelElement *che,
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AACUsacElemConfig *ue);
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/** Decode frame SBR data, USAC. */
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int ff_aac_sbr_decode_usac_data(AACDecContext *ac, ChannelElement *che,
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AACUsacElemConfig *ue, GetBitContext *gb,
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int sbr_ch, int indep_flag);
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/** Apply one SBR element to one AAC element. */
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void ff_aac_sbr_apply(AACDecContext *ac, ChannelElement *che,
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int id_aac, void /* float */ *L, void /* float */ *R);
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void ff_aac_sbr_apply_fixed(AACDecContext *ac, ChannelElement *che,
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int id_aac, void /* int */ *L, void /* int */ *R);
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FF_VISIBILITY_POP_HIDDEN
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#endif /* AVCODEC_AACSBR_H */
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