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libavcodec/sbr.h

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00001 /*
00002  * Spectral Band Replication definitions and structures
00003  * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
00004  * Copyright (c) 2010      Alex Converse <alex.converse@gmail.com>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00029 #ifndef AVCODEC_SBR_H
00030 #define AVCODEC_SBR_H
00031 
00032 #include <stdint.h>
00033 #include "fft.h"
00034 #include "aacps.h"
00035 
00039 typedef struct {
00040     uint8_t bs_start_freq;
00041     uint8_t bs_stop_freq;
00042     uint8_t bs_xover_band;
00043 
00048     uint8_t bs_freq_scale;
00049     uint8_t bs_alter_scale;
00050     uint8_t bs_noise_bands;
00052 } SpectrumParameters;
00053 
00054 #define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2)
00055 
00059 typedef struct {
00064     unsigned           bs_frame_class;
00065     unsigned           bs_add_harmonic_flag;
00066     unsigned           bs_num_env;
00067     uint8_t            bs_freq_res[7];
00068     unsigned           bs_num_noise;
00069     uint8_t            bs_df_env[5];
00070     uint8_t            bs_df_noise[2];
00071     uint8_t            bs_invf_mode[2][5];
00072     uint8_t            bs_add_harmonic[48];
00073     unsigned           bs_amp_res;
00080     DECLARE_ALIGNED(16, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE];
00081     DECLARE_ALIGNED(16, float, analysis_filterbank_samples) [1312];
00082     int                synthesis_filterbank_samples_offset;
00084     int                e_a[2];
00086     float              bw_array[5];
00088     float              W[2][32][32][2];
00090     float              Y[2][38][64][2];
00091     float              g_temp[42][48];
00092     float              q_temp[42][48];
00093     uint8_t            s_indexmapped[8][48];
00095     float              env_facs[6][48];
00097     float              noise_facs[3][5];
00099     uint8_t            t_env[8];
00101     uint8_t            t_env_num_env_old;
00103     uint8_t            t_q[3];
00104     unsigned           f_indexnoise;
00105     unsigned           f_indexsine;
00107 } SBRData;
00108 
00112 typedef struct {
00113     int                sample_rate;
00114     int                start;
00115     int                reset;
00116     SpectrumParameters spectrum_params;
00117     int                bs_amp_res_header;
00122     unsigned           bs_limiter_bands;
00123     unsigned           bs_limiter_gains;
00124     unsigned           bs_interpol_freq;
00125     unsigned           bs_smoothing_mode;
00127     unsigned           bs_coupling;
00128     unsigned           k[5]; 
00129 
00130 
00131     unsigned           kx[2];
00133     unsigned           m[2];
00135     unsigned           n_master;
00136     SBRData            data[2];
00137     PSContext          ps;
00139     unsigned           n[2];
00141     unsigned           n_q;
00143     unsigned           n_lim;
00145     uint16_t           f_master[49];
00147     uint16_t           f_tablelow[25];
00149     uint16_t           f_tablehigh[49];
00151     uint16_t           f_tablenoise[6];
00153     uint16_t           f_tablelim[29];
00154     unsigned           num_patches;
00155     uint8_t            patch_num_subbands[6];
00156     uint8_t            patch_start_subband[6];
00158     float              X_low[32][40][2];
00160     float              X_high[64][40][2];
00162     DECLARE_ALIGNED(16, float, X)[2][2][38][64];
00164     float              alpha0[64][2];
00166     float              alpha1[64][2];
00168     float              e_origmapped[7][48];
00170     float              q_mapped[7][48];
00172     uint8_t            s_mapped[7][48];
00174     float              e_curr[7][48];
00176     float              q_m[7][48];
00178     float              s_m[7][48];
00179     float              gain[7][48];
00180     DECLARE_ALIGNED(16, float, qmf_filter_scratch)[5][64];
00181     FFTContext         mdct_ana;
00182     FFTContext         mdct;
00183 } SpectralBandReplication;
00184 
00185 #endif /* AVCODEC_SBR_H */

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