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