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  1. /*
  2.  * SIPR / ACELP.NET decoder
  3.  *
  4.  * Copyright (c) 2008 Vladimir Voroshilov
  5.  * Copyright (c) 2009 Vitor Sessak
  6.  *
  7.  * This file is part of FFmpeg.
  8.  *
  9.  * FFmpeg is free software; you can redistribute it and/or
  10.  * modify it under the terms of the GNU Lesser General Public
  11.  * License as published by the Free Software Foundation; either
  12.  * version 2.1 of the License, or (at your option) any later version.
  13.  *
  14.  * FFmpeg is distributed in the hope that it will be useful,
  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17.  * Lesser General Public License for more details.
  18.  *
  19.  * You should have received a copy of the GNU Lesser General Public
  20.  * License along with FFmpeg; if not, write to the Free Software
  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22.  */
  23.  
  24. #ifndef AVCODEC_SIPR_H
  25. #define AVCODEC_SIPR_H
  26.  
  27. #include "avcodec.h"
  28. #include "acelp_pitch_delay.h"
  29. #include "libavutil/mem.h"
  30.  
  31. #define LP_FILTER_ORDER_16k  16
  32. #define L_SUBFR_16k          80
  33. #define PITCH_MIN            30
  34. #define PITCH_MAX            281
  35.  
  36. #define LSFQ_DIFF_MIN        (0.0125 * M_PI)
  37.  
  38. #define LP_FILTER_ORDER      10
  39.  
  40. /** Number of past samples needed for excitation interpolation */
  41. #define L_INTERPOL           (LP_FILTER_ORDER + 1)
  42.  
  43. /**  Subframe size for all modes except 16k */
  44. #define SUBFR_SIZE           48
  45.  
  46. #define SUBFRAME_COUNT_16k   2
  47.  
  48. typedef enum {
  49.     MODE_16k,
  50.     MODE_8k5,
  51.     MODE_6k5,
  52.     MODE_5k0,
  53.     MODE_COUNT
  54. } SiprMode;
  55.  
  56. typedef struct SiprParameters {
  57.     int ma_pred_switch;        ///< switched moving average predictor
  58.     int vq_indexes[5];
  59.     int pitch_delay[5];        ///< pitch delay
  60.     int gp_index[5];           ///< adaptive-codebook gain indexes
  61.     int16_t fc_indexes[5][10]; ///< fixed-codebook indexes
  62.     int gc_index[5];           ///< fixed-codebook gain indexes
  63. } SiprParameters;
  64.  
  65. typedef struct SiprContext {
  66.     AVCodecContext *avctx;
  67.  
  68.     SiprMode mode;
  69.  
  70.     float past_pitch_gain;
  71.     float lsf_history[LP_FILTER_ORDER_16k];
  72.  
  73.     float excitation[L_INTERPOL + PITCH_MAX + 2 * L_SUBFR_16k];
  74.  
  75.     DECLARE_ALIGNED(16, float, synth_buf)[LP_FILTER_ORDER + 5*SUBFR_SIZE + 6];
  76.  
  77.     float lsp_history[LP_FILTER_ORDER];
  78.     float gain_mem;
  79.     float energy_history[4];
  80.     float highpass_filt_mem[2];
  81.     float postfilter_mem[PITCH_DELAY_MAX + LP_FILTER_ORDER];
  82.  
  83.     /* 5k0 */
  84.     float tilt_mem;
  85.     float postfilter_agc;
  86.     float postfilter_mem5k0[PITCH_DELAY_MAX + LP_FILTER_ORDER];
  87.     float postfilter_syn5k0[LP_FILTER_ORDER + SUBFR_SIZE*5];
  88.  
  89.     /* 16k */
  90.     int pitch_lag_prev;
  91.     float iir_mem[LP_FILTER_ORDER_16k+1];
  92.     float filt_buf[2][LP_FILTER_ORDER_16k+1];
  93.     float *filt_mem[2];
  94.     float mem_preemph[LP_FILTER_ORDER_16k];
  95.     float synth[LP_FILTER_ORDER_16k];
  96.     double lsp_history_16k[16];
  97.  
  98.     void (*decode_frame)(struct SiprContext *ctx, SiprParameters *params,
  99.                          float *out_data);
  100. } SiprContext;
  101.  
  102. extern const float ff_pow_0_5[16];
  103.  
  104. void ff_sipr_init_16k(SiprContext *ctx);
  105.  
  106. void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
  107.                               float *out_data);
  108.  
  109. #endif /* AVCODEC_SIPR_H */
  110.