186 lines
6.2 KiB
C
186 lines
6.2 KiB
C
/*
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* Spectral Band Replication definitions and structures
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* Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
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* Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Spectral Band Replication definitions and structures
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* @author Robert Swain ( rob opendot cl )
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*/
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#ifndef AVCODEC_SBR_H
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#define AVCODEC_SBR_H
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#include <stdint.h>
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#include "fft.h"
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#include "aacps.h"
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/**
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* Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
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*/
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typedef struct {
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uint8_t bs_start_freq;
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uint8_t bs_stop_freq;
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uint8_t bs_xover_band;
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/**
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* @defgroup bs_header_extra_1 Variables associated with bs_header_extra_1
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* @{
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*/
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uint8_t bs_freq_scale;
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uint8_t bs_alter_scale;
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uint8_t bs_noise_bands;
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/** @} */
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} SpectrumParameters;
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#define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2)
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/**
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* Spectral Band Replication per channel data
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*/
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typedef struct {
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/**
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* @defgroup bitstream Main bitstream data variables
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* @{
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*/
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unsigned bs_frame_class;
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unsigned bs_add_harmonic_flag;
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unsigned bs_num_env;
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uint8_t bs_freq_res[7];
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unsigned bs_num_noise;
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uint8_t bs_df_env[5];
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uint8_t bs_df_noise[2];
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uint8_t bs_invf_mode[2][5];
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uint8_t bs_add_harmonic[48];
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unsigned bs_amp_res;
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/** @} */
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/**
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* @defgroup state State variables
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* @{
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*/
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DECLARE_ALIGNED(16, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE];
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DECLARE_ALIGNED(16, float, analysis_filterbank_samples) [1312];
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int synthesis_filterbank_samples_offset;
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///l_APrev and l_A
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int e_a[2];
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///Chirp factors
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float bw_array[5];
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///QMF values of the original signal
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float W[2][32][32][2];
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///QMF output of the HF adjustor
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float Y[2][38][64][2];
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float g_temp[42][48];
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float q_temp[42][48];
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uint8_t s_indexmapped[8][48];
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///Envelope scalefactors
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float env_facs[6][48];
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///Noise scalefactors
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float noise_facs[3][5];
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///Envelope time borders
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uint8_t t_env[8];
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///Envelope time border of the last envelope of the previous frame
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uint8_t t_env_num_env_old;
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///Noise time borders
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uint8_t t_q[3];
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unsigned f_indexnoise;
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unsigned f_indexsine;
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/** @} */
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} SBRData;
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/**
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* Spectral Band Replication
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*/
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typedef struct {
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int sample_rate;
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int start;
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int reset;
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SpectrumParameters spectrum_params;
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int bs_amp_res_header;
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/**
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* @defgroup bs_header_extra_2 variables associated with bs_header_extra_2
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* @{
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*/
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unsigned bs_limiter_bands;
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unsigned bs_limiter_gains;
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unsigned bs_interpol_freq;
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unsigned bs_smoothing_mode;
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/** @} */
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unsigned bs_coupling;
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unsigned k[5]; ///< k0, k1, k2
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///kx', and kx respectively, kx is the first QMF subband where SBR is used.
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///kx' is its value from the previous frame
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unsigned kx[2];
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///M' and M respectively, M is the number of QMF subbands that use SBR.
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unsigned m[2];
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///The number of frequency bands in f_master
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unsigned n_master;
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SBRData data[2];
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PSContext ps;
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///N_Low and N_High respectively, the number of frequency bands for low and high resolution
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unsigned n[2];
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///Number of noise floor bands
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unsigned n_q;
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///Number of limiter bands
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unsigned n_lim;
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///The master QMF frequency grouping
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uint16_t f_master[49];
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///Frequency borders for low resolution SBR
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uint16_t f_tablelow[25];
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///Frequency borders for high resolution SBR
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uint16_t f_tablehigh[49];
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///Frequency borders for noise floors
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uint16_t f_tablenoise[6];
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///Frequency borders for the limiter
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uint16_t f_tablelim[29];
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unsigned num_patches;
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uint8_t patch_num_subbands[6];
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uint8_t patch_start_subband[6];
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///QMF low frequency input to the HF generator
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float X_low[32][40][2];
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///QMF output of the HF generator
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float X_high[64][40][2];
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///QMF values of the reconstructed signal
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DECLARE_ALIGNED(16, float, X)[2][2][38][64];
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///Zeroth coefficient used to filter the subband signals
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float alpha0[64][2];
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///First coefficient used to filter the subband signals
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float alpha1[64][2];
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///Dequantized envelope scalefactors, remapped
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float e_origmapped[7][48];
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///Dequantized noise scalefactors, remapped
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float q_mapped[7][48];
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///Sinusoidal presence, remapped
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uint8_t s_mapped[7][48];
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///Estimated envelope
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float e_curr[7][48];
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///Amplitude adjusted noise scalefactors
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float q_m[7][48];
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///Sinusoidal levels
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float s_m[7][48];
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float gain[7][48];
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DECLARE_ALIGNED(16, float, qmf_filter_scratch)[5][64];
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FFTContext mdct_ana;
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FFTContext mdct;
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} SpectralBandReplication;
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#endif /* AVCODEC_SBR_H */
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