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The AAC fixed-point and floating-point decoders have a lot of duplicated code; the main obstacle to deduplicating it is that several structures with the same name are actually different types, because they contain INTFLOATs (int or float) and AAC_FLOATs (SoftFloat or float). SoftFloat and float typically have different sizes, so dealing with it is the more complicated of the two. AAC_FLOAT is mainly used in the sbr code and structures, so one can still deduplicate the code by only exposing the common part of ChannelElement (without SBR context) to the common decoder part. One prerequisite of this is to move allocating the whole ChannelElement to code that will stay unduplicated. It is most natural to move said allocation to ff_aac_sbr_ctx_init(). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
86 lines
2.5 KiB
C
86 lines
2.5 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 "aacdec.h"
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#include "aac_defines.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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/** Initialize SBR. */
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void AAC_RENAME(ff_aac_sbr_init)(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 AAC_RENAME(ff_aac_sbr_ctx_alloc_init)(AACDecContext *ac, ChannelElement **che, int id_aac);
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/** Close one SBR context. */
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void AAC_RENAME(ff_aac_sbr_ctx_close)(ChannelElement *che);
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/** Decode one SBR element. */
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int AAC_RENAME(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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/** Apply one SBR element to one AAC element. */
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void AAC_RENAME(ff_aac_sbr_apply)(AACDecContext *ac, ChannelElement *che,
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int id_aac, INTFLOAT* L, INTFLOAT* R);
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#endif /* AVCODEC_AACSBR_H */
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