| /* |
| * 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 "libavutil/mem_internal.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 */ |
