release/src/router/ffmpeg/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 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
  35 /**
  36  * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
  37  */
  38 typedef struct {
  39     uint8_t bs_start_freq;
  40     uint8_t bs_stop_freq;
  41     uint8_t bs_xover_band;
  42
  43     /**
  44      * @defgroup bs_header_extra_1     Variables associated with bs_header_extra_1
  45      * @{
  46      */
  47     uint8_t bs_freq_scale;
  48     uint8_t bs_alter_scale;
  49     uint8_t bs_noise_bands;
  50     /** @} */
  51 } SpectrumParameters;
  52
  53 #define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2)
  54
  55 /**
  56  * Spectral Band Replication per channel data
  57  */
  58 typedef struct {
  59     /**
  60      * @defgroup bitstream     Main bitstream data variables
  61      * @{
  62      */
  63     unsigned           bs_frame_class;
  64     unsigned           bs_add_harmonic_flag;
  65     unsigned           bs_num_env;
  66     uint8_t            bs_freq_res[7];
  67     unsigned           bs_num_noise;
  68     uint8_t            bs_df_env[5];
  69     uint8_t            bs_df_noise[2];
  70     uint8_t            bs_invf_mode[2][5];
  71     uint8_t            bs_add_harmonic[48];
  72     unsigned           bs_amp_res;
  73     /** @} */
  74
  75     /**
  76      * @defgroup state         State variables
  77      * @{
  78      */
  79     DECLARE_ALIGNED(16, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE];
  80     DECLARE_ALIGNED(16, float, analysis_filterbank_samples) [1312];
  81     int                synthesis_filterbank_samples_offset;
  82     ///l_APrev and l_A
  83     int                e_a[2];
  84     ///Chirp factors
  85     float              bw_array[5];
  86     ///QMF values of the original signal
  87     float              W[2][32][32][2];
  88     ///QMF output of the HF adjustor
  89     float              Y[2][38][64][2];
  90     float              g_temp[42][48];
  91     float              q_temp[42][48];
  92     uint8_t            s_indexmapped[8][48];
  93     ///Envelope scalefactors
  94     float              env_facs[6][48];
  95     ///Noise scalefactors
  96     float              noise_facs[3][5];
  97     ///Envelope time borders
  98     uint8_t            t_env[8];
  99     ///Envelope time border of the last envelope of the previous frame
 100     uint8_t            t_env_num_env_old;
 101     ///Noise time borders
 102     uint8_t            t_q[3];
 103     unsigned           f_indexnoise;
 104     unsigned           f_indexsine;
 105     /** @} */
 106 } SBRData;
 107
 108 /**
 109  * Spectral Band Replication
 110  */
 111 typedef struct {
 112     int                sample_rate;
 113     int                start;
 114     int                reset;
 115     SpectrumParameters spectrum_params;
 116     int                bs_amp_res_header;
 117     /**
 118      * @defgroup bs_header_extra_2     variables associated with bs_header_extra_2
 119      * @{
 120      */
 121     unsigned           bs_limiter_bands;
 122     unsigned           bs_limiter_gains;
 123     unsigned           bs_interpol_freq;
 124     unsigned           bs_smoothing_mode;
 125     /** @} */
 126     unsigned           bs_coupling;
 127     unsigned           k[5]; ///< k0, k1, k2
 128     ///kx', and kx respectively, kx is the first QMF subband where SBR is used.
 129     ///kx' is its value from the previous frame
 130     unsigned           kx[2];
 131     ///M' and M respectively, M is the number of QMF subbands that use SBR.
 132     unsigned           m[2];
 133     ///The number of frequency bands in f_master
 134     unsigned           n_master;
 135     SBRData            data[2];
 136     ///N_Low and N_High respectively, the number of frequency bands for low and high resolution
 137     unsigned           n[2];
 138     ///Number of noise floor bands
 139     unsigned           n_q;
 140     ///Number of limiter bands
 141     unsigned           n_lim;
 142     ///The master QMF frequency grouping
 143     uint16_t           f_master[49];
 144     ///Frequency borders for low resolution SBR
 145     uint16_t           f_tablelow[25];
 146     ///Frequency borders for high resolution SBR
 147     uint16_t           f_tablehigh[49];
 148     ///Frequency borders for noise floors
 149     uint16_t           f_tablenoise[6];
 150     ///Frequency borders for the limiter
 151     uint16_t           f_tablelim[29];
 152     unsigned           num_patches;
 153     uint8_t            patch_num_subbands[6];
 154     uint8_t            patch_start_subband[6];
 155     ///QMF low frequency input to the HF generator
 156     float              X_low[32][40][2];
 157     ///QMF output of the HF generator
 158     float              X_high[64][40][2];
 159     ///QMF values of the reconstructed signal
 160     DECLARE_ALIGNED(16, float, X)[2][2][32][64];
 161     ///Zeroth coefficient used to filter the subband signals
 162     float              alpha0[64][2];
 163     ///First coefficient used to filter the subband signals
 164     float              alpha1[64][2];
 165     ///Dequantized envelope scalefactors, remapped
 166     float              e_origmapped[7][48];
 167     ///Dequantized noise scalefactors, remapped
 168     float              q_mapped[7][48];
 169     ///Sinusoidal presence, remapped
 170     uint8_t            s_mapped[7][48];
 171     ///Estimated envelope
 172     float              e_curr[7][48];
 173     ///Amplitude adjusted noise scalefactors
 174     float              q_m[7][48];
 175     ///Sinusoidal levels
 176     float              s_m[7][48];
 177     float              gain[7][48];
 178     DECLARE_ALIGNED(16, float, qmf_filter_scratch)[5][64];
 179     RDFTContext        rdft;
 180     FFTContext         mdct;
 181 } SpectralBandReplication;
 182
 183 #endif /* AVCODEC_SBR_H */