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99 lines
3.0 KiB
99 lines
3.0 KiB
/* |
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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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/** 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, float *L, float *R); |
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void ff_aac_sbr_apply_fixed(AACDecContext *ac, ChannelElement *che, |
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int id_aac, int *L, int *R); |
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FF_VISIBILITY_POP_HIDDEN |
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#endif /* AVCODEC_AACSBR_H */
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