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