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 34#include "libavutil/mem_internal.h" 35 36#include "fft.h" 37#include "aacps.h" 38#include "sbrdsp.h" 39 40typedef struct AACContext AACContext; 41 42/** 43 * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header. 44 */ 45typedef struct SpectrumParameters { 46 uint8_t bs_start_freq; 47 uint8_t bs_stop_freq; 48 uint8_t bs_xover_band; 49 50 /** 51 * @name Variables associated with bs_header_extra_1 52 * @{ 53 */ 54 uint8_t bs_freq_scale; 55 uint8_t bs_alter_scale; 56 uint8_t bs_noise_bands; 57 /** @} */ 58} SpectrumParameters; 59 60#define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2) 61 62/** 63 * Spectral Band Replication per channel data 64 */ 65typedef struct SBRData { 66 /** 67 * @name Main bitstream data variables 68 * @{ 69 */ 70 unsigned bs_frame_class; 71 unsigned bs_add_harmonic_flag; 72 AAC_SIGNE bs_num_env; 73 uint8_t bs_freq_res[7]; 74 AAC_SIGNE bs_num_noise; 75 uint8_t bs_df_env[5]; 76 uint8_t bs_df_noise[2]; 77 uint8_t bs_invf_mode[2][5]; 78 uint8_t bs_add_harmonic[48]; 79 unsigned bs_amp_res; 80 /** @} */ 81 82 /** 83 * @name State variables 84 * @{ 85 */ 86 DECLARE_ALIGNED(32, INTFLOAT, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE]; 87 DECLARE_ALIGNED(32, INTFLOAT, analysis_filterbank_samples) [1312]; 88 int synthesis_filterbank_samples_offset; 89 ///l_APrev and l_A 90 int e_a[2]; 91 ///Chirp factors 92 INTFLOAT bw_array[5]; 93 ///QMF values of the original signal 94 INTFLOAT W[2][32][32][2]; 95 ///QMF output of the HF adjustor 96 int Ypos; 97 DECLARE_ALIGNED(16, INTFLOAT, Y)[2][38][64][2]; 98 DECLARE_ALIGNED(16, AAC_FLOAT, g_temp)[42][48]; 99 AAC_FLOAT q_temp[42][48]; 100 uint8_t s_indexmapped[8][48]; 101 ///Envelope scalefactors 102 uint8_t env_facs_q[6][48]; 103 AAC_FLOAT env_facs[6][48]; 104 ///Noise scalefactors 105 uint8_t noise_facs_q[3][5]; 106 AAC_FLOAT noise_facs[3][5]; 107 ///Envelope time borders 108 uint8_t t_env[8]; 109 ///Envelope time border of the last envelope of the previous frame 110 uint8_t t_env_num_env_old; 111 ///Noise time borders 112 uint8_t t_q[3]; 113 unsigned f_indexnoise; 114 unsigned f_indexsine; 115 /** @} */ 116} SBRData; 117 118typedef struct SpectralBandReplication SpectralBandReplication; 119 120/** 121 * aacsbr functions pointers 122 */ 123typedef struct AACSBRContext { 124 int (*sbr_lf_gen)(AACContext *ac, SpectralBandReplication *sbr, 125 INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2], 126 int buf_idx); 127 void (*sbr_hf_assemble)(INTFLOAT Y1[38][64][2], 128 const INTFLOAT X_high[64][40][2], 129 SpectralBandReplication *sbr, SBRData *ch_data, 130 const int e_a[2]); 131 int (*sbr_x_gen)(SpectralBandReplication *sbr, INTFLOAT X[2][38][64], 132 const INTFLOAT Y0[38][64][2], const INTFLOAT Y1[38][64][2], 133 const INTFLOAT X_low[32][40][2], int ch); 134 void (*sbr_hf_inverse_filter)(SBRDSPContext *dsp, 135 INTFLOAT (*alpha0)[2], INTFLOAT (*alpha1)[2], 136 const INTFLOAT X_low[32][40][2], int k0); 137} AACSBRContext; 138 139/** 140 * Spectral Band Replication 141 */ 142struct SpectralBandReplication { 143 int sample_rate; 144 int start; 145 int ready_for_dequant; 146 int id_aac; 147 int reset; 148 SpectrumParameters spectrum_params; 149 int bs_amp_res_header; 150 /** 151 * @name Variables associated with bs_header_extra_2 152 * @{ 153 */ 154 unsigned bs_limiter_bands; 155 unsigned bs_limiter_gains; 156 unsigned bs_interpol_freq; 157 unsigned bs_smoothing_mode; 158 /** @} */ 159 unsigned bs_coupling; 160 AAC_SIGNE k[5]; ///< k0, k1, k2 161 ///kx', and kx respectively, kx is the first QMF subband where SBR is used. 162 ///kx' is its value from the previous frame 163 AAC_SIGNE kx[2]; 164 ///M' and M respectively, M is the number of QMF subbands that use SBR. 165 AAC_SIGNE m[2]; 166 unsigned kx_and_m_pushed; 167 ///The number of frequency bands in f_master 168 AAC_SIGNE n_master; 169 SBRData data[2]; 170 PSContext ps; 171 ///N_Low and N_High respectively, the number of frequency bands for low and high resolution 172 AAC_SIGNE n[2]; 173 ///Number of noise floor bands 174 AAC_SIGNE n_q; 175 ///Number of limiter bands 176 AAC_SIGNE n_lim; 177 ///The master QMF frequency grouping 178 uint16_t f_master[49]; 179 ///Frequency borders for low resolution SBR 180 uint16_t f_tablelow[25]; 181 ///Frequency borders for high resolution SBR 182 uint16_t f_tablehigh[49]; 183 ///Frequency borders for noise floors 184 uint16_t f_tablenoise[6]; 185 ///Frequency borders for the limiter 186 uint16_t f_tablelim[30]; 187 AAC_SIGNE num_patches; 188 uint8_t patch_num_subbands[6]; 189 uint8_t patch_start_subband[6]; 190 ///QMF low frequency input to the HF generator 191 DECLARE_ALIGNED(16, INTFLOAT, X_low)[32][40][2]; 192 ///QMF output of the HF generator 193 DECLARE_ALIGNED(16, INTFLOAT, X_high)[64][40][2]; 194 ///QMF values of the reconstructed signal 195 DECLARE_ALIGNED(16, INTFLOAT, X)[2][2][38][64]; 196 ///Zeroth coefficient used to filter the subband signals 197 DECLARE_ALIGNED(16, INTFLOAT, alpha0)[64][2]; 198 ///First coefficient used to filter the subband signals 199 DECLARE_ALIGNED(16, INTFLOAT, alpha1)[64][2]; 200 ///Dequantized envelope scalefactors, remapped 201 AAC_FLOAT e_origmapped[7][48]; 202 ///Dequantized noise scalefactors, remapped 203 AAC_FLOAT q_mapped[7][48]; 204 ///Sinusoidal presence, remapped 205 uint8_t s_mapped[7][48]; 206 ///Estimated envelope 207 AAC_FLOAT e_curr[7][48]; 208 ///Amplitude adjusted noise scalefactors 209 AAC_FLOAT q_m[7][48]; 210 ///Sinusoidal levels 211 AAC_FLOAT s_m[7][48]; 212 AAC_FLOAT gain[7][48]; 213 DECLARE_ALIGNED(32, INTFLOAT, qmf_filter_scratch)[5][64]; 214 FFTContext mdct_ana; 215 FFTContext mdct; 216 SBRDSPContext dsp; 217 AACSBRContext c; 218}; 219 220#endif /* AVCODEC_SBR_H */ 221