/* * 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 */