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/*
* SIPR / ACELP.NET decoder
*
* Copyright (c) 2008 Vladimir Voroshilov
* Copyright (c) 2009 Vitor Sessak
*
* 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
*/
#ifndef AVCODEC_SIPR_H
#define AVCODEC_SIPR_H
#include "avcodec.h"
#include "acelp_pitch_delay.h"
#include "libavutil/mem.h"
#define LP_FILTER_ORDER_16k 16
#define L_SUBFR_16k 80
#define PITCH_MIN 30
#define PITCH_MAX 281
#define LSFQ_DIFF_MIN (0.0125 * M_PI)
#define LP_FILTER_ORDER 10
/** Number of past samples needed for excitation interpolation */
#define L_INTERPOL (LP_FILTER_ORDER + 1)
/** Subframe size for all modes except 16k */
#define SUBFR_SIZE 48
#define SUBFRAME_COUNT_16k 2
typedef enum {
MODE_16k,
MODE_8k5,
MODE_6k5,
MODE_5k0,
MODE_COUNT
} SiprMode;
typedef struct SiprParameters {
int ma_pred_switch; ///< switched moving average predictor
int vq_indexes[5];
int pitch_delay[5]; ///< pitch delay
int gp_index[5]; ///< adaptive-codebook gain indexes
int16_t fc_indexes[5][10]; ///< fixed-codebook indexes
int gc_index[5]; ///< fixed-codebook gain indexes
} SiprParameters;
typedef struct SiprContext {
AVCodecContext *avctx;
SiprMode mode;
float past_pitch_gain;
float lsf_history[LP_FILTER_ORDER_16k];
float excitation[L_INTERPOL + PITCH_MAX + 2 * L_SUBFR_16k];
DECLARE_ALIGNED(16, float, synth_buf)[LP_FILTER_ORDER + 5*SUBFR_SIZE + 6];
float lsp_history[LP_FILTER_ORDER];
float gain_mem;
float energy_history[4];
float highpass_filt_mem[2];
float postfilter_mem[PITCH_DELAY_MAX + LP_FILTER_ORDER];
/* 5k0 */
float tilt_mem;
float postfilter_agc;
float postfilter_mem5k0[PITCH_DELAY_MAX + LP_FILTER_ORDER];
float postfilter_syn5k0[LP_FILTER_ORDER + SUBFR_SIZE*5];
/* 16k */
int pitch_lag_prev;
float iir_mem[LP_FILTER_ORDER_16k+1];
float filt_buf[2][LP_FILTER_ORDER_16k+1];
float *filt_mem[2];
float mem_preemph[LP_FILTER_ORDER_16k];
float synth[LP_FILTER_ORDER_16k];
double lsp_history_16k[16];
void (*decode_frame)(struct SiprContext *ctx, SiprParameters *params,
float *out_data);
} SiprContext;
extern const float ff_pow_0_5[16];
void ff_sipr_init_16k(SiprContext *ctx);
void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
float *out_data);
#endif /* AVCODEC_SIPR_H */
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