/*
  * 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 */