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/* |
* 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" |
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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; |
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(32, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE]; |
DECLARE_ALIGNED(32, 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 |
int Ypos; |
DECLARE_ALIGNED(16, float, Y)[2][38][64][2]; |
DECLARE_ALIGNED(16, 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; |
|
typedef struct SpectralBandReplication SpectralBandReplication; |
|
/** |
* aacsbr functions pointers |
*/ |
typedef struct AACSBRContext { |
int (*sbr_lf_gen)(AACContext *ac, SpectralBandReplication *sbr, |
float X_low[32][40][2], const float W[2][32][32][2], |
int buf_idx); |
void (*sbr_hf_assemble)(float Y1[38][64][2], |
const float X_high[64][40][2], |
SpectralBandReplication *sbr, SBRData *ch_data, |
const int e_a[2]); |
int (*sbr_x_gen)(SpectralBandReplication *sbr, float X[2][38][64], |
const float Y0[38][64][2], const float Y1[38][64][2], |
const float X_low[32][40][2], int ch); |
void (*sbr_hf_inverse_filter)(SBRDSPContext *dsp, |
float (*alpha0)[2], float (*alpha1)[2], |
const float X_low[32][40][2], int k0); |
} AACSBRContext; |
|
/** |
* Spectral Band Replication |
*/ |
struct SpectralBandReplication { |
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]; |
unsigned kx_and_m_pushed; |
///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[30]; |
unsigned 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, float, X_low)[32][40][2]; |
///QMF output of the HF generator |
DECLARE_ALIGNED(16, 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 |
DECLARE_ALIGNED(16, float, alpha0)[64][2]; |
///First coefficient used to filter the subband signals |
DECLARE_ALIGNED(16, 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(32, float, qmf_filter_scratch)[5][64]; |
FFTContext mdct_ana; |
FFTContext mdct; |
SBRDSPContext dsp; |
AACSBRContext c; |
}; |
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#endif /* AVCODEC_SBR_H */ |