218 lines
7.5 KiB
C
218 lines
7.5 KiB
C
/*
|
|
* 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"
|
|
#include "sbrdsp.h"
|
|
|
|
typedef struct AACContext AACContext;
|
|
|
|
/**
|
|
* Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
|
|
*/
|
|
typedef struct SpectrumParameters {
|
|
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 SBRData {
|
|
/**
|
|
* @name Main bitstream data variables
|
|
* @{
|
|
*/
|
|
unsigned bs_frame_class;
|
|
unsigned bs_add_harmonic_flag;
|
|
AAC_SIGNE bs_num_env;
|
|
uint8_t bs_freq_res[7];
|
|
AAC_SIGNE 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(32, INTFLOAT, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE];
|
|
DECLARE_ALIGNED(32, INTFLOAT, analysis_filterbank_samples) [1312];
|
|
int synthesis_filterbank_samples_offset;
|
|
///l_APrev and l_A
|
|
int e_a[2];
|
|
///Chirp factors
|
|
INTFLOAT bw_array[5];
|
|
///QMF values of the original signal
|
|
INTFLOAT W[2][32][32][2];
|
|
///QMF output of the HF adjustor
|
|
int Ypos;
|
|
DECLARE_ALIGNED(16, INTFLOAT, Y)[2][38][64][2];
|
|
DECLARE_ALIGNED(16, AAC_FLOAT, g_temp)[42][48];
|
|
AAC_FLOAT q_temp[42][48];
|
|
uint8_t s_indexmapped[8][48];
|
|
///Envelope scalefactors
|
|
uint8_t env_facs_q[6][48];
|
|
AAC_FLOAT env_facs[6][48];
|
|
///Noise scalefactors
|
|
uint8_t noise_facs_q[3][5];
|
|
AAC_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;
|
|
|
|
typedef struct SpectralBandReplication SpectralBandReplication;
|
|
|
|
/**
|
|
* aacsbr functions pointers
|
|
*/
|
|
typedef struct AACSBRContext {
|
|
int (*sbr_lf_gen)(AACContext *ac, SpectralBandReplication *sbr,
|
|
INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2],
|
|
int buf_idx);
|
|
void (*sbr_hf_assemble)(INTFLOAT Y1[38][64][2],
|
|
const INTFLOAT X_high[64][40][2],
|
|
SpectralBandReplication *sbr, SBRData *ch_data,
|
|
const int e_a[2]);
|
|
int (*sbr_x_gen)(SpectralBandReplication *sbr, INTFLOAT X[2][38][64],
|
|
const INTFLOAT Y0[38][64][2], const INTFLOAT Y1[38][64][2],
|
|
const INTFLOAT X_low[32][40][2], int ch);
|
|
void (*sbr_hf_inverse_filter)(SBRDSPContext *dsp,
|
|
INTFLOAT (*alpha0)[2], INTFLOAT (*alpha1)[2],
|
|
const INTFLOAT X_low[32][40][2], int k0);
|
|
} AACSBRContext;
|
|
|
|
/**
|
|
* Spectral Band Replication
|
|
*/
|
|
struct SpectralBandReplication {
|
|
int sample_rate;
|
|
int start;
|
|
int ready_for_dequant;
|
|
int id_aac;
|
|
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;
|
|
AAC_SIGNE 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
|
|
AAC_SIGNE kx[2];
|
|
///M' and M respectively, M is the number of QMF subbands that use SBR.
|
|
AAC_SIGNE m[2];
|
|
unsigned kx_and_m_pushed;
|
|
///The number of frequency bands in f_master
|
|
AAC_SIGNE n_master;
|
|
SBRData data[2];
|
|
PSContext ps;
|
|
///N_Low and N_High respectively, the number of frequency bands for low and high resolution
|
|
AAC_SIGNE n[2];
|
|
///Number of noise floor bands
|
|
AAC_SIGNE n_q;
|
|
///Number of limiter bands
|
|
AAC_SIGNE 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[30];
|
|
AAC_SIGNE num_patches;
|
|
uint8_t patch_num_subbands[6];
|
|
uint8_t patch_start_subband[6];
|
|
///QMF low frequency input to the HF generator
|
|
DECLARE_ALIGNED(16, INTFLOAT, X_low)[32][40][2];
|
|
///QMF output of the HF generator
|
|
DECLARE_ALIGNED(16, INTFLOAT, X_high)[64][40][2];
|
|
///QMF values of the reconstructed signal
|
|
DECLARE_ALIGNED(16, INTFLOAT, X)[2][2][38][64];
|
|
///Zeroth coefficient used to filter the subband signals
|
|
DECLARE_ALIGNED(16, INTFLOAT, alpha0)[64][2];
|
|
///First coefficient used to filter the subband signals
|
|
DECLARE_ALIGNED(16, INTFLOAT, alpha1)[64][2];
|
|
///Dequantized envelope scalefactors, remapped
|
|
AAC_FLOAT e_origmapped[7][48];
|
|
///Dequantized noise scalefactors, remapped
|
|
AAC_FLOAT q_mapped[7][48];
|
|
///Sinusoidal presence, remapped
|
|
uint8_t s_mapped[7][48];
|
|
///Estimated envelope
|
|
AAC_FLOAT e_curr[7][48];
|
|
///Amplitude adjusted noise scalefactors
|
|
AAC_FLOAT q_m[7][48];
|
|
///Sinusoidal levels
|
|
AAC_FLOAT s_m[7][48];
|
|
AAC_FLOAT gain[7][48];
|
|
DECLARE_ALIGNED(32, INTFLOAT, qmf_filter_scratch)[5][64];
|
|
FFTContext mdct_ana;
|
|
FFTContext mdct;
|
|
SBRDSPContext dsp;
|
|
AACSBRContext c;
|
|
};
|
|
|
|
#endif /* AVCODEC_SBR_H */
|