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Diffstat (limited to 'ffmpeg/libavcodec/sbr.h')
| -rw-r--r-- | ffmpeg/libavcodec/sbr.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/sbr.h b/ffmpeg/libavcodec/sbr.h new file mode 100644 index 0000000..e28fccd --- /dev/null +++ b/ffmpeg/libavcodec/sbr.h @@ -0,0 +1,213 @@ +/* + * 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; + 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; +}; + +#endif /* AVCODEC_SBR_H */ |