/* * 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" /** * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header. */ typedef struct { 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 { /** * @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(16, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE]; DECLARE_ALIGNED(16, 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 float Y[2][38][64][2]; 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; /** * Spectral Band Replication */ typedef struct { 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]; ///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[29]; unsigned num_patches; uint8_t patch_num_subbands[6]; uint8_t patch_start_subband[6]; ///QMF low frequency input to the HF generator float X_low[32][40][2]; ///QMF output of the HF generator 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 float alpha0[64][2]; ///First coefficient used to filter the subband signals 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(16, float, qmf_filter_scratch)[5][64]; FFTContext mdct_ana; FFTContext mdct; } SpectralBandReplication; #endif /* AVCODEC_SBR_H */