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185 lines
6.2 KiB
185 lines
6.2 KiB
/* |
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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 aac_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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