libavcodec/sbr.h

   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 #include "sbrdsp.h"
  36
  37 /**
  38  * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
  39  */
  40 typedef struct {
  41     uint8_t bs_start_freq;
  42     uint8_t bs_stop_freq;
  43     uint8_t bs_xover_band;
  44
  45     /**
  46      * @name Variables associated with bs_header_extra_1
  47      * @{
  48      */
  49     uint8_t bs_freq_scale;
  50     uint8_t bs_alter_scale;
  51     uint8_t bs_noise_bands;
  52     /** @} */
  53 } SpectrumParameters;
  54
  55 #define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2)
  56
  57 /**
  58  * Spectral Band Replication per channel data
  59  */
  60 typedef struct {
  61     /**
  62      * @name Main bitstream data variables
  63      * @{
  64      */
  65     unsigned           bs_frame_class;
  66     unsigned           bs_add_harmonic_flag;
  67     unsigned           bs_num_env;
  68     uint8_t            bs_freq_res[7];
  69     unsigned           bs_num_noise;
  70     uint8_t            bs_df_env[5];
  71     uint8_t            bs_df_noise[2];
  72     uint8_t            bs_invf_mode[2][5];
  73     uint8_t            bs_add_harmonic[48];
  74     unsigned           bs_amp_res;
  75     /** @} */
  76
  77     /**
  78      * @name State variables
  79      * @{
  80      */
  81     DECLARE_ALIGNED(32, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE];
  82     DECLARE_ALIGNED(32, float, analysis_filterbank_samples) [1312];
  83     int                synthesis_filterbank_samples_offset;
  84     ///l_APrev and l_A
  85     int                e_a[2];
  86     ///Chirp factors
  87     float              bw_array[5];
  88     ///QMF values of the original signal
  89     float              W[2][32][32][2];
  90     ///QMF output of the HF adjustor
  91     int                Ypos;
  92     DECLARE_ALIGNED(16, float, Y)[2][38][64][2];
  93     DECLARE_ALIGNED(16, float, g_temp)[42][48];
  94     float              q_temp[42][48];
  95     uint8_t            s_indexmapped[8][48];
  96     ///Envelope scalefactors
  97     float              env_facs[6][48];
  98     ///Noise scalefactors
  99     float              noise_facs[3][5];
 100     ///Envelope time borders
 101     uint8_t            t_env[8];
 102     ///Envelope time border of the last envelope of the previous frame
 103     uint8_t            t_env_num_env_old;
 104     ///Noise time borders
 105     uint8_t            t_q[3];
 106     unsigned           f_indexnoise;
 107     unsigned           f_indexsine;
 108     /** @} */
 109 } SBRData;
 110
 111 /**
 112  * Spectral Band Replication
 113  */
 114 typedef struct {
 115     int                sample_rate;
 116     int                start;
 117     int                reset;
 118     SpectrumParameters spectrum_params;
 119     int                bs_amp_res_header;
 120     /**
 121      * @name Variables associated with bs_header_extra_2
 122      * @{
 123      */
 124     unsigned           bs_limiter_bands;
 125     unsigned           bs_limiter_gains;
 126     unsigned           bs_interpol_freq;
 127     unsigned           bs_smoothing_mode;
 128     /** @} */
 129     unsigned           bs_coupling;
 130     unsigned           k[5]; ///< k0, k1, k2
 131     ///kx', and kx respectively, kx is the first QMF subband where SBR is used.
 132     ///kx' is its value from the previous frame
 133     unsigned           kx[2];
 134     ///M' and M respectively, M is the number of QMF subbands that use SBR.
 135     unsigned           m[2];
 136     unsigned           kx_and_m_pushed;
 137     ///The number of frequency bands in f_master
 138     unsigned           n_master;
 139     SBRData            data[2];
 140     PSContext          ps;
 141     ///N_Low and N_High respectively, the number of frequency bands for low and high resolution
 142     unsigned           n[2];
 143     ///Number of noise floor bands
 144     unsigned           n_q;
 145     ///Number of limiter bands
 146     unsigned           n_lim;
 147     ///The master QMF frequency grouping
 148     uint16_t           f_master[49];
 149     ///Frequency borders for low resolution SBR
 150     uint16_t           f_tablelow[25];
 151     ///Frequency borders for high resolution SBR
 152     uint16_t           f_tablehigh[49];
 153     ///Frequency borders for noise floors
 154     uint16_t           f_tablenoise[6];
 155     ///Frequency borders for the limiter
 156     uint16_t           f_tablelim[29];
 157     unsigned           num_patches;
 158     uint8_t            patch_num_subbands[6];
 159     uint8_t            patch_start_subband[6];
 160     ///QMF low frequency input to the HF generator
 161     DECLARE_ALIGNED(16, float, X_low)[32][40][2];
 162     ///QMF output of the HF generator
 163     DECLARE_ALIGNED(16, float, X_high)[64][40][2];
 164     ///QMF values of the reconstructed signal
 165     DECLARE_ALIGNED(16, float, X)[2][2][38][64];
 166     ///Zeroth coefficient used to filter the subband signals
 167     DECLARE_ALIGNED(16, float, alpha0)[64][2];
 168     ///First coefficient used to filter the subband signals
 169     DECLARE_ALIGNED(16, float, alpha1)[64][2];
 170     ///Dequantized envelope scalefactors, remapped
 171     float              e_origmapped[7][48];
 172     ///Dequantized noise scalefactors, remapped
 173     float              q_mapped[7][48];
 174     ///Sinusoidal presence, remapped
 175     uint8_t            s_mapped[7][48];
 176     ///Estimated envelope
 177     float              e_curr[7][48];
 178     ///Amplitude adjusted noise scalefactors
 179     float              q_m[7][48];
 180     ///Sinusoidal levels
 181     float              s_m[7][48];
 182     float              gain[7][48];
 183     DECLARE_ALIGNED(32, float, qmf_filter_scratch)[5][64];
 184     FFTContext         mdct_ana;
 185     FFTContext         mdct;
 186     SBRDSPContext      dsp;
 187 } SpectralBandReplication;
 188
 189 #endif /* AVCODEC_SBR_H */