1 /* 2 * AAC Spectral Band Replication function declarations 3 * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl ) 4 * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com> 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23 /** 24 * @file 25 * AAC Spectral Band Replication function declarations 26 * @author Robert Swain ( rob opendot cl ) 27 */ 28 29 #ifndef AVCODEC_AACSBR_H 30 #define AVCODEC_AACSBR_H 31 32 #include "get_bits.h" 33 #include "aac.h" 34 #include "sbr.h" 35 36 #define ENVELOPE_ADJUSTMENT_OFFSET 2 37 #define NOISE_FLOOR_OFFSET 6 38 39 /** 40 * SBR VLC tables 41 */ 42 enum { 43 T_HUFFMAN_ENV_1_5DB, 44 F_HUFFMAN_ENV_1_5DB, 45 T_HUFFMAN_ENV_BAL_1_5DB, 46 F_HUFFMAN_ENV_BAL_1_5DB, 47 T_HUFFMAN_ENV_3_0DB, 48 F_HUFFMAN_ENV_3_0DB, 49 T_HUFFMAN_ENV_BAL_3_0DB, 50 F_HUFFMAN_ENV_BAL_3_0DB, 51 T_HUFFMAN_NOISE_3_0DB, 52 T_HUFFMAN_NOISE_BAL_3_0DB, 53 }; 54 55 /** 56 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98) 57 */ 58 enum { 59 FIXFIX, 60 FIXVAR, 61 VARFIX, 62 VARVAR, 63 }; 64 65 enum { 66 EXTENSION_ID_PS = 2, 67 }; 68 69 static const int8_t vlc_sbr_lav[10] = 70 { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 }; 71 72 #define SBR_INIT_VLC_STATIC(num, size) \ 73 INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \ 74 sbr_tmp[num].sbr_bits , 1, 1, \ 75 sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \ 76 size) 77 78 #define SBR_VLC_ROW(name) \ 79 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) } 80 81 /** Initialize SBR. */ 82 void AAC_RENAME(ff_aac_sbr_init)(void); 83 /** Initialize one SBR context. */ 84 void AAC_RENAME(ff_aac_sbr_ctx_init)(AACContext *ac, SpectralBandReplication *sbr, int id_aac); 85 /** Close one SBR context. */ 86 void AAC_RENAME(ff_aac_sbr_ctx_close)(SpectralBandReplication *sbr); 87 /** Decode one SBR element. */ 88 int AAC_RENAME(ff_decode_sbr_extension)(AACContext *ac, SpectralBandReplication *sbr, 89 GetBitContext *gb, int crc, int cnt, int id_aac); 90 /** Apply one SBR element to one AAC element. */ 91 void AAC_RENAME(ff_sbr_apply)(AACContext *ac, SpectralBandReplication *sbr, int id_aac, 92 INTFLOAT* L, INTFLOAT *R); 93 94 void ff_aacsbr_func_ptr_init_mips(AACSBRContext *c); 95 96 #endif /* AVCODEC_AACSBR_H */ 97