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#include "aacps.h" 35#include "sbrdsp.h" 36 37typedef struct AACContext AACContext; 38 39/** 40 * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header. 41 */ 42typedef struct SpectrumParameters { 43 uint8_t bs_start_freq; 44 uint8_t bs_stop_freq; 45 uint8_t bs_xover_band; 46 47 /** 48 * @name Variables associated with bs_header_extra_1 49 * @{ 50 */ 51 uint8_t bs_freq_scale; 52 uint8_t bs_alter_scale; 53 uint8_t bs_noise_bands; 54 /** @} */ 55} SpectrumParameters; 56 57#define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2) 58 59/** 60 * Spectral Band Replication per channel data 61 */ 62typedef struct SBRData { 63 /** 64 * @name Main bitstream data variables 65 * @{ 66 */ 67 unsigned bs_frame_class; 68 unsigned bs_add_harmonic_flag; 69 unsigned bs_num_env; 70 uint8_t bs_freq_res[7]; 71 unsigned bs_num_noise; 72 uint8_t bs_df_env[5]; 73 uint8_t bs_df_noise[2]; 74 uint8_t bs_invf_mode[2][5]; 75 uint8_t bs_add_harmonic[48]; 76 unsigned bs_amp_res; 77 /** @} */ 78 79 /** 80 * @name State variables 81 * @{ 82 */ 83 DECLARE_ALIGNED(32, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE]; 84 DECLARE_ALIGNED(32, float, analysis_filterbank_samples) [1312]; 85 int synthesis_filterbank_samples_offset; 86 ///l_APrev and l_A 87 int e_a[2]; 88 ///Chirp factors 89 float bw_array[5]; 90 ///QMF values of the original signal 91 float W[2][32][32][2]; 92 ///QMF output of the HF adjustor 93 int Ypos; 94 DECLARE_ALIGNED(16, float, Y)[2][38][64][2]; 95 DECLARE_ALIGNED(16, float, g_temp)[42][48]; 96 float q_temp[42][48]; 97 uint8_t s_indexmapped[8][48]; 98 ///Envelope scalefactors 99 float env_facs[6][48]; 100 ///Noise scalefactors 101 float noise_facs[3][5]; 102 ///Envelope time borders 103 uint8_t t_env[8]; 104 ///Envelope time border of the last envelope of the previous frame 105 uint8_t t_env_num_env_old; 106 ///Noise time borders 107 uint8_t t_q[3]; 108 unsigned f_indexnoise; 109 unsigned f_indexsine; 110 /** @} */ 111} SBRData; 112 113typedef struct SpectralBandReplication SpectralBandReplication; 114 115/** 116 * aacsbr functions pointers 117 */ 118typedef struct AACSBRContext { 119 int (*sbr_lf_gen)(AACContext *ac, SpectralBandReplication *sbr, 120 float X_low[32][40][2], const float W[2][32][32][2], 121 int buf_idx); 122 void (*sbr_hf_assemble)(float Y1[38][64][2], 123 const float X_high[64][40][2], 124 SpectralBandReplication *sbr, SBRData *ch_data, 125 const int e_a[2]); 126 int (*sbr_x_gen)(SpectralBandReplication *sbr, float X[2][38][64], 127 const float Y0[38][64][2], const float Y1[38][64][2], 128 const float X_low[32][40][2], int ch); 129 void (*sbr_hf_inverse_filter)(SBRDSPContext *dsp, 130 float (*alpha0)[2], float (*alpha1)[2], 131 const float X_low[32][40][2], int k0); 132} AACSBRContext; 133 134/** 135 * Spectral Band Replication 136 */ 137struct SpectralBandReplication { 138 int sample_rate; 139 int start; 140 int reset; 141 SpectrumParameters spectrum_params; 142 int bs_amp_res_header; 143 /** 144 * @name Variables associated with bs_header_extra_2 145 * @{ 146 */ 147 unsigned bs_limiter_bands; 148 unsigned bs_limiter_gains; 149 unsigned bs_interpol_freq; 150 unsigned bs_smoothing_mode; 151 /** @} */ 152 unsigned bs_coupling; 153 unsigned k[5]; ///< k0, k1, k2 154 ///kx', and kx respectively, kx is the first QMF subband where SBR is used. 155 ///kx' is its value from the previous frame 156 unsigned kx[2]; 157 ///M' and M respectively, M is the number of QMF subbands that use SBR. 158 unsigned m[2]; 159 unsigned kx_and_m_pushed; 160 ///The number of frequency bands in f_master 161 unsigned n_master; 162 SBRData data[2]; 163 PSContext ps; 164 ///N_Low and N_High respectively, the number of frequency bands for low and high resolution 165 unsigned n[2]; 166 ///Number of noise floor bands 167 unsigned n_q; 168 ///Number of limiter bands 169 unsigned n_lim; 170 ///The master QMF frequency grouping 171 uint16_t f_master[49]; 172 ///Frequency borders for low resolution SBR 173 uint16_t f_tablelow[25]; 174 ///Frequency borders for high resolution SBR 175 uint16_t f_tablehigh[49]; 176 ///Frequency borders for noise floors 177 uint16_t f_tablenoise[6]; 178 ///Frequency borders for the limiter 179 uint16_t f_tablelim[30]; 180 unsigned num_patches; 181 uint8_t patch_num_subbands[6]; 182 uint8_t patch_start_subband[6]; 183 ///QMF low frequency input to the HF generator 184 DECLARE_ALIGNED(16, float, X_low)[32][40][2]; 185 ///QMF output of the HF generator 186 DECLARE_ALIGNED(16, float, X_high)[64][40][2]; 187 ///QMF values of the reconstructed signal 188 DECLARE_ALIGNED(16, float, X)[2][2][38][64]; 189 ///Zeroth coefficient used to filter the subband signals 190 DECLARE_ALIGNED(16, float, alpha0)[64][2]; 191 ///First coefficient used to filter the subband signals 192 DECLARE_ALIGNED(16, float, alpha1)[64][2]; 193 ///Dequantized envelope scalefactors, remapped 194 float e_origmapped[7][48]; 195 ///Dequantized noise scalefactors, remapped 196 float q_mapped[7][48]; 197 ///Sinusoidal presence, remapped 198 uint8_t s_mapped[7][48]; 199 ///Estimated envelope 200 float e_curr[7][48]; 201 ///Amplitude adjusted noise scalefactors 202 float q_m[7][48]; 203 ///Sinusoidal levels 204 float s_m[7][48]; 205 float gain[7][48]; 206 DECLARE_ALIGNED(32, float, qmf_filter_scratch)[5][64]; 207 FFTContext mdct_ana; 208 FFTContext mdct; 209 SBRDSPContext dsp; 210 AACSBRContext c; 211}; 212 213#endif /* AVCODEC_SBR_H */ 214