Subversion Repositories Kolibri OS

/*

 * Spectral Band Replication definitions and structures

 * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )

 * Copyright (c) 2010      Alex Converse 

 *

 * 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 

#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 */