1/* 2 * Spectral Band Replication definitions and structures 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 Libav. 7 * 8 * Libav 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 * Libav 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 Libav; 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 * Spectral Band Replication definitions and structures 26 * @author Robert Swain ( rob opendot cl ) 27 */ 28 29#ifndef AVCODEC_SBR_H 30#define AVCODEC_SBR_H 31 32#include <stdint.h> 33#include "fft.h" 34#include "aacps.h" 35 36/** 37 * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header. 38 */ 39typedef struct { 40 uint8_t bs_start_freq; 41 uint8_t bs_stop_freq; 42 uint8_t bs_xover_band; 43 44 /** 45 * @name Variables associated with bs_header_extra_1 46 * @{ 47 */ 48 uint8_t bs_freq_scale; 49 uint8_t bs_alter_scale; 50 uint8_t bs_noise_bands; 51 /** @} */ 52} SpectrumParameters; 53 54#define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2) 55 56/** 57 * Spectral Band Replication per channel data 58 */ 59typedef struct { 60 /** 61 * @name Main bitstream data variables 62 * @{ 63 */ 64 unsigned bs_frame_class; 65 unsigned bs_add_harmonic_flag; 66 unsigned bs_num_env; 67 uint8_t bs_freq_res[7]; 68 unsigned bs_num_noise; 69 uint8_t bs_df_env[5]; 70 uint8_t bs_df_noise[2]; 71 uint8_t bs_invf_mode[2][5]; 72 uint8_t bs_add_harmonic[48]; 73 unsigned bs_amp_res; 74 /** @} */ 75 76 /** 77 * @name State variables 78 * @{ 79 */ 80 DECLARE_ALIGNED(16, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE]; 81 DECLARE_ALIGNED(16, float, analysis_filterbank_samples) [1312]; 82 int synthesis_filterbank_samples_offset; 83 ///l_APrev and l_A 84 int e_a[2]; 85 ///Chirp factors 86 float bw_array[5]; 87 ///QMF values of the original signal 88 float W[2][32][32][2]; 89 ///QMF output of the HF adjustor 90 float Y[2][38][64][2]; 91 float g_temp[42][48]; 92 float q_temp[42][48]; 93 uint8_t s_indexmapped[8][48]; 94 ///Envelope scalefactors 95 float env_facs[6][48]; 96 ///Noise scalefactors 97 float noise_facs[3][5]; 98 ///Envelope time borders 99 uint8_t t_env[8]; 100 ///Envelope time border of the last envelope of the previous frame 101 uint8_t t_env_num_env_old; 102 ///Noise time borders 103 uint8_t t_q[3]; 104 unsigned f_indexnoise; 105 unsigned f_indexsine; 106 /** @} */ 107} SBRData; 108 109/** 110 * Spectral Band Replication 111 */ 112typedef struct { 113 int sample_rate; 114 int start; 115 int reset; 116 SpectrumParameters spectrum_params; 117 int bs_amp_res_header; 118 /** 119 * @name Variables associated with bs_header_extra_2 120 * @{ 121 */ 122 unsigned bs_limiter_bands; 123 unsigned bs_limiter_gains; 124 unsigned bs_interpol_freq; 125 unsigned bs_smoothing_mode; 126 /** @} */ 127 unsigned bs_coupling; 128 unsigned k[5]; ///< k0, k1, k2 129 ///kx', and kx respectively, kx is the first QMF subband where SBR is used. 130 ///kx' is its value from the previous frame 131 unsigned kx[2]; 132 ///M' and M respectively, M is the number of QMF subbands that use SBR. 133 unsigned m[2]; 134 ///The number of frequency bands in f_master 135 unsigned n_master; 136 SBRData data[2]; 137 PSContext ps; 138 ///N_Low and N_High respectively, the number of frequency bands for low and high resolution 139 unsigned n[2]; 140 ///Number of noise floor bands 141 unsigned n_q; 142 ///Number of limiter bands 143 unsigned n_lim; 144 ///The master QMF frequency grouping 145 uint16_t f_master[49]; 146 ///Frequency borders for low resolution SBR 147 uint16_t f_tablelow[25]; 148 ///Frequency borders for high resolution SBR 149 uint16_t f_tablehigh[49]; 150 ///Frequency borders for noise floors 151 uint16_t f_tablenoise[6]; 152 ///Frequency borders for the limiter 153 uint16_t f_tablelim[29]; 154 unsigned num_patches; 155 uint8_t patch_num_subbands[6]; 156 uint8_t patch_start_subband[6]; 157 ///QMF low frequency input to the HF generator 158 float X_low[32][40][2]; 159 ///QMF output of the HF generator 160 float X_high[64][40][2]; 161 ///QMF values of the reconstructed signal 162 DECLARE_ALIGNED(16, float, X)[2][2][38][64]; 163 ///Zeroth coefficient used to filter the subband signals 164 float alpha0[64][2]; 165 ///First coefficient used to filter the subband signals 166 float alpha1[64][2]; 167 ///Dequantized envelope scalefactors, remapped 168 float e_origmapped[7][48]; 169 ///Dequantized noise scalefactors, remapped 170 float q_mapped[7][48]; 171 ///Sinusoidal presence, remapped 172 uint8_t s_mapped[7][48]; 173 ///Estimated envelope 174 float e_curr[7][48]; 175 ///Amplitude adjusted noise scalefactors 176 float q_m[7][48]; 177 ///Sinusoidal levels 178 float s_m[7][48]; 179 float gain[7][48]; 180 DECLARE_ALIGNED(16, float, qmf_filter_scratch)[5][64]; 181 FFTContext mdct_ana; 182 FFTContext mdct; 183} SpectralBandReplication; 184 185#endif /* AVCODEC_SBR_H */ 186