ffmpeg/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 "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 */