libavcodec/sipr.h

   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 "acelp_pitch_delay.h"
  28 #include "libavutil/mem_internal.h"
  29
  30 #define LP_FILTER_ORDER_16k  16
  31 #define L_SUBFR_16k          80
  32 #define PITCH_MIN            30
  33 #define PITCH_MAX            281
  34
  35 #define LSFQ_DIFF_MIN        (0.0125 * M_PI)
  36
  37 #define LP_FILTER_ORDER      10
  38
  39 /** Number of past samples needed for excitation interpolation */
  40 #define L_INTERPOL           (LP_FILTER_ORDER + 1)
  41
  42 /**  Subframe size for all modes except 16k */
  43 #define SUBFR_SIZE           48
  44
  45 #define SUBFRAME_COUNT_16k   2
  46
  47 typedef enum {
  48     MODE_16k,
  49     MODE_8k5,
  50     MODE_6k5,
  51     MODE_5k0,
  52     MODE_COUNT
  53 } SiprMode;
  54
  55 typedef struct SiprParameters {
  56     int ma_pred_switch;        ///< switched moving average predictor
  57     int vq_indexes[5];
  58     int pitch_delay[5];        ///< pitch delay
  59     int gp_index[5];           ///< adaptive-codebook gain indexes
  60     int16_t fc_indexes[5][10]; ///< fixed-codebook indexes
  61     int gc_index[5];           ///< fixed-codebook gain indexes
  62 } SiprParameters;
  63
  64 typedef struct SiprContext {
  65     SiprMode mode;
  66
  67     float past_pitch_gain;
  68     float lsf_history[LP_FILTER_ORDER_16k];
  69
  70     float excitation[L_INTERPOL + PITCH_MAX + 2 * L_SUBFR_16k];
  71
  72     DECLARE_ALIGNED(16, float, synth_buf)[LP_FILTER_ORDER + 5*SUBFR_SIZE + 6];
  73
  74     float lsp_history[LP_FILTER_ORDER];
  75     float gain_mem;
  76     float energy_history[4];
  77     float highpass_filt_mem[2];
  78     float postfilter_mem[PITCH_DELAY_MAX + LP_FILTER_ORDER];
  79
  80     /* 5k0 */
  81     float tilt_mem;
  82     float postfilter_agc;
  83     float postfilter_mem5k0[PITCH_DELAY_MAX + LP_FILTER_ORDER];
  84     float postfilter_syn5k0[LP_FILTER_ORDER + SUBFR_SIZE*5];
  85
  86     /* 16k */
  87     int pitch_lag_prev;
  88     float iir_mem[LP_FILTER_ORDER_16k+1];
  89     float filt_buf[2][LP_FILTER_ORDER_16k+1];
  90     float *filt_mem[2];
  91     float mem_preemph[LP_FILTER_ORDER_16k];
  92     float synth[LP_FILTER_ORDER_16k];
  93     double lsp_history_16k[16];
  94
  95     void (*decode_frame)(struct SiprContext *ctx, SiprParameters *params,
  96                          float *out_data);
  97 } SiprContext;
  98
  99 extern const float ff_pow_0_5[16];
 100
 101 void ff_sipr_init_16k(SiprContext *ctx);
 102
 103 void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
 104                               float *out_data);
 105
 106 #endif /* AVCODEC_SIPR_H */