/*
  * Spectral Band Replication definitions and structures
  * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
  * Copyright (c) 2010      Alex Converse <alex.converse@gmail.com>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**

  * @file

  * Spectral Band Replication definitions and structures
  * @author Robert Swain ( rob opendot cl )
  */
 
 #ifndef AVCODEC_SBR_H
 #define AVCODEC_SBR_H
 
 #include <stdint.h>
 #include "fft.h"

 #include "aacps.h"

 
 /**
  * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
  */
 typedef struct {
     uint8_t bs_start_freq;
     uint8_t bs_stop_freq;
     uint8_t bs_xover_band;
 
     /**

      * @name Variables associated with bs_header_extra_1

      * @{
      */
     uint8_t bs_freq_scale;
     uint8_t bs_alter_scale;
     uint8_t bs_noise_bands;
     /** @} */
 } SpectrumParameters;
 
 #define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2)
 
 /**
  * Spectral Band Replication per channel data
  */
 typedef struct {
     /**

      * @name Main bitstream data variables

      * @{
      */
     unsigned           bs_frame_class;
     unsigned           bs_add_harmonic_flag;

     unsigned           bs_num_env;

     uint8_t            bs_freq_res[7];
     unsigned           bs_num_noise;
     uint8_t            bs_df_env[5];
     uint8_t            bs_df_noise[2];
     uint8_t            bs_invf_mode[2][5];
     uint8_t            bs_add_harmonic[48];
     unsigned           bs_amp_res;
     /** @} */
 
     /**

      * @name State variables

      * @{
      */
     DECLARE_ALIGNED(16, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE];
     DECLARE_ALIGNED(16, float, analysis_filterbank_samples) [1312];
     int                synthesis_filterbank_samples_offset;
     ///l_APrev and l_A
     int                e_a[2];
     ///Chirp factors
     float              bw_array[5];
     ///QMF values of the original signal
     float              W[2][32][32][2];
     ///QMF output of the HF adjustor
     float              Y[2][38][64][2];
     float              g_temp[42][48];
     float              q_temp[42][48];
     uint8_t            s_indexmapped[8][48];
     ///Envelope scalefactors
     float              env_facs[6][48];
     ///Noise scalefactors
     float              noise_facs[3][5];
     ///Envelope time borders
     uint8_t            t_env[8];
     ///Envelope time border of the last envelope of the previous frame
     uint8_t            t_env_num_env_old;
     ///Noise time borders
     uint8_t            t_q[3];
     unsigned           f_indexnoise;
     unsigned           f_indexsine;
     /** @} */
 } SBRData;
 
 /**
  * Spectral Band Replication
  */
 typedef struct {
     int                sample_rate;
     int                start;
     int                reset;
     SpectrumParameters spectrum_params;
     int                bs_amp_res_header;
     /**

      * @name Variables associated with bs_header_extra_2

      * @{
      */
     unsigned           bs_limiter_bands;
     unsigned           bs_limiter_gains;
     unsigned           bs_interpol_freq;
     unsigned           bs_smoothing_mode;
     /** @} */
     unsigned           bs_coupling;
     unsigned           k[5]; ///< k0, k1, k2
     ///kx', and kx respectively, kx is the first QMF subband where SBR is used.
     ///kx' is its value from the previous frame
     unsigned           kx[2];
     ///M' and M respectively, M is the number of QMF subbands that use SBR.
     unsigned           m[2];
     ///The number of frequency bands in f_master
     unsigned           n_master;
     SBRData            data[2];

     PSContext          ps;

     ///N_Low and N_High respectively, the number of frequency bands for low and high resolution
     unsigned           n[2];
     ///Number of noise floor bands
     unsigned           n_q;
     ///Number of limiter bands
     unsigned           n_lim;
     ///The master QMF frequency grouping
     uint16_t           f_master[49];
     ///Frequency borders for low resolution SBR
     uint16_t           f_tablelow[25];
     ///Frequency borders for high resolution SBR
     uint16_t           f_tablehigh[49];
     ///Frequency borders for noise floors
     uint16_t           f_tablenoise[6];
     ///Frequency borders for the limiter
     uint16_t           f_tablelim[29];
     unsigned           num_patches;
     uint8_t            patch_num_subbands[6];
     uint8_t            patch_start_subband[6];
     ///QMF low frequency input to the HF generator
     float              X_low[32][40][2];
     ///QMF output of the HF generator
     float              X_high[64][40][2];
     ///QMF values of the reconstructed signal

     DECLARE_ALIGNED(16, float, X)[2][2][38][64];

     ///Zeroth coefficient used to filter the subband signals
     float              alpha0[64][2];
     ///First coefficient used to filter the subband signals
     float              alpha1[64][2];
     ///Dequantized envelope scalefactors, remapped
     float              e_origmapped[7][48];
     ///Dequantized noise scalefactors, remapped
     float              q_mapped[7][48];
     ///Sinusoidal presence, remapped
     uint8_t            s_mapped[7][48];
     ///Estimated envelope
     float              e_curr[7][48];
     ///Amplitude adjusted noise scalefactors
     float              q_m[7][48];
     ///Sinusoidal levels
     float              s_m[7][48];
     float              gain[7][48];
     DECLARE_ALIGNED(16, float, qmf_filter_scratch)[5][64];

     FFTContext         mdct_ana;

     FFTContext         mdct;
 } SpectralBandReplication;
 
 #endif /* AVCODEC_SBR_H */