LCOV - code coverage report
Current view: top level - src/libavcodec - acelp_pitch_delay.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 28 63 44.4 %
Date: 2017-09-22 10:31:19 Functions: 2 9 22.2 %

          Line data    Source code
       1             : /*
       2             :  * gain code, gain pitch and pitch delay decoding
       3             :  *
       4             :  * Copyright (c) 2008 Vladimir Voroshilov
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       8             :  * FFmpeg is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public
      10             :  * License as published by the Free Software Foundation; either
      11             :  * version 2.1 of the License, or (at your option) any later version.
      12             :  *
      13             :  * FFmpeg is distributed in the hope that it will be useful,
      14             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public
      19             :  * License along with FFmpeg; if not, write to the Free Software
      20             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      21             :  */
      22             : 
      23             : #include "libavutil/common.h"
      24             : #include "libavutil/ffmath.h"
      25             : #include "libavutil/float_dsp.h"
      26             : #include "libavutil/mathematics.h"
      27             : #include "avcodec.h"
      28             : #include "acelp_pitch_delay.h"
      29             : #include "celp_math.h"
      30             : #include "audiodsp.h"
      31             : 
      32           0 : int ff_acelp_decode_8bit_to_1st_delay3(int ac_index)
      33             : {
      34           0 :     ac_index += 58;
      35           0 :     if(ac_index > 254)
      36           0 :         ac_index = 3 * ac_index - 510;
      37           0 :     return ac_index;
      38             : }
      39             : 
      40           0 : int ff_acelp_decode_4bit_to_2nd_delay3(
      41             :         int ac_index,
      42             :         int pitch_delay_min)
      43             : {
      44           0 :     if(ac_index < 4)
      45           0 :         return 3 * (ac_index + pitch_delay_min);
      46           0 :     else if(ac_index < 12)
      47           0 :         return 3 * pitch_delay_min + ac_index + 6;
      48             :     else
      49           0 :         return 3 * (ac_index + pitch_delay_min) - 18;
      50             : }
      51             : 
      52           0 : int ff_acelp_decode_5_6_bit_to_2nd_delay3(
      53             :         int ac_index,
      54             :         int pitch_delay_min)
      55             : {
      56           0 :         return 3 * pitch_delay_min + ac_index - 2;
      57             : }
      58             : 
      59           0 : int ff_acelp_decode_9bit_to_1st_delay6(int ac_index)
      60             : {
      61           0 :     if(ac_index < 463)
      62           0 :         return ac_index + 105;
      63             :     else
      64           0 :         return 6 * (ac_index - 368);
      65             : }
      66           0 : int ff_acelp_decode_6bit_to_2nd_delay6(
      67             :         int ac_index,
      68             :         int pitch_delay_min)
      69             : {
      70           0 :     return 6 * pitch_delay_min + ac_index - 3;
      71             : }
      72             : 
      73           0 : void ff_acelp_update_past_gain(
      74             :     int16_t* quant_energy,
      75             :     int gain_corr_factor,
      76             :     int log2_ma_pred_order,
      77             :     int erasure)
      78             : {
      79             :     int i;
      80           0 :     int avg_gain=quant_energy[(1 << log2_ma_pred_order) - 1]; // (5.10)
      81             : 
      82           0 :     for(i=(1 << log2_ma_pred_order) - 1; i>0; i--)
      83             :     {
      84           0 :         avg_gain       += quant_energy[i-1];
      85           0 :         quant_energy[i] = quant_energy[i-1];
      86             :     }
      87             : 
      88           0 :     if(erasure)
      89           0 :         quant_energy[0] = FFMAX(avg_gain >> log2_ma_pred_order, -10240) - 4096; // -10 and -4 in (5.10)
      90             :     else
      91           0 :         quant_energy[0] = (6165 * ((ff_log2_q15(gain_corr_factor) >> 2) - (13 << 13))) >> 13;
      92           0 : }
      93             : 
      94           0 : int16_t ff_acelp_decode_gain_code(
      95             :     AudioDSPContext *adsp,
      96             :     int gain_corr_factor,
      97             :     const int16_t* fc_v,
      98             :     int mr_energy,
      99             :     const int16_t* quant_energy,
     100             :     const int16_t* ma_prediction_coeff,
     101             :     int subframe_size,
     102             :     int ma_pred_order)
     103             : {
     104             :     int i;
     105             : 
     106           0 :     mr_energy <<= 10;
     107             : 
     108           0 :     for(i=0; i<ma_pred_order; i++)
     109           0 :         mr_energy += quant_energy[i] * ma_prediction_coeff[i];
     110             : 
     111             : #ifdef G729_BITEXACT
     112             :     mr_energy += (((-6165LL * ff_log2(dsp->scalarproduct_int16(fc_v, fc_v, subframe_size, 0))) >> 3) & ~0x3ff);
     113             : 
     114             :     mr_energy = (5439 * (mr_energy >> 15)) >> 8;           // (0.15) = (0.15) * (7.23)
     115             : 
     116             :     return bidir_sal(
     117             :                ((ff_exp2(mr_energy & 0x7fff) + 16) >> 5) * (gain_corr_factor >> 1),
     118             :                (mr_energy >> 15) - 25
     119             :            );
     120             : #else
     121           0 :     mr_energy = gain_corr_factor * exp(M_LN10 / (20 << 23) * mr_energy) /
     122           0 :                 sqrt(adsp->scalarproduct_int16(fc_v, fc_v, subframe_size));
     123           0 :     return mr_energy >> 12;
     124             : #endif
     125             : }
     126             : 
     127       53056 : float ff_amr_set_fixed_gain(float fixed_gain_factor, float fixed_mean_energy,
     128             :                             float *prediction_error, float energy_mean,
     129             :                             const float *pred_table)
     130             : {
     131             :     // Equations 66-69:
     132             :     // ^g_c = ^gamma_gc * 100.05 (predicted dB + mean dB - dB of fixed vector)
     133             :     // Note 10^(0.05 * -10log(average x2)) = 1/sqrt((average x2)).
     134      159168 :     float val = fixed_gain_factor *
     135       53056 :         ff_exp10(0.05 *
     136       53056 :               (avpriv_scalarproduct_float_c(pred_table, prediction_error, 4) +
     137       53056 :                energy_mean)) /
     138       53056 :         sqrtf(fixed_mean_energy ? fixed_mean_energy : 1.0);
     139             : 
     140             :     // update quantified prediction error energy history
     141       53056 :     memmove(&prediction_error[0], &prediction_error[1],
     142             :             3 * sizeof(prediction_error[0]));
     143       53056 :     prediction_error[3] = 20.0 * log10f(fixed_gain_factor);
     144             : 
     145       53056 :     return val;
     146             : }
     147             : 
     148       24848 : void ff_decode_pitch_lag(int *lag_int, int *lag_frac, int pitch_index,
     149             :                          const int prev_lag_int, const int subframe,
     150             :                          int third_as_first, int resolution)
     151             : {
     152             :     /* Note n * 10923 >> 15 is floor(x/3) for 0 <= n <= 32767 */
     153       24848 :     if (subframe == 0 || (subframe == 2 && third_as_first)) {
     154             : 
     155       18528 :         if (pitch_index < 197)
     156        7157 :             pitch_index += 59;
     157             :         else
     158        2107 :             pitch_index = 3 * pitch_index - 335;
     159             : 
     160             :     } else {
     161       15584 :         if (resolution == 4) {
     162        2840 :             int search_range_min = av_clip(prev_lag_int - 5, PITCH_DELAY_MIN,
     163             :                                            PITCH_DELAY_MAX - 9);
     164             : 
     165             :             // decoding with 4-bit resolution
     166        2840 :             if (pitch_index < 4) {
     167             :                 // integer only precision for [search_range_min, search_range_min+3]
     168         614 :                 pitch_index = 3 * (pitch_index + search_range_min) + 1;
     169        2226 :             } else if (pitch_index < 12) {
     170             :                 // 1/3 fractional precision for [search_range_min+3 1/3, search_range_min+5 2/3]
     171        1325 :                 pitch_index += 3 * search_range_min + 7;
     172             :             } else {
     173             :                 // integer only precision for [search_range_min+6, search_range_min+9]
     174         901 :                 pitch_index = 3 * (pitch_index + search_range_min - 6) + 1;
     175             :             }
     176             :         } else {
     177             :             // decoding with 5 or 6 bit resolution, 1/3 fractional precision
     178       12744 :             pitch_index--;
     179             : 
     180       12744 :             if (resolution == 5) {
     181         568 :                 pitch_index += 3 * av_clip(prev_lag_int - 10, PITCH_DELAY_MIN,
     182             :                                            PITCH_DELAY_MAX - 19);
     183             :             } else
     184       12176 :                 pitch_index += 3 * av_clip(prev_lag_int - 5, PITCH_DELAY_MIN,
     185             :                                            PITCH_DELAY_MAX - 9);
     186             :         }
     187             :     }
     188       24848 :     *lag_int  = pitch_index * 10923 >> 15;
     189       24848 :     *lag_frac = pitch_index - 3 * *lag_int - 1;
     190       24848 : }

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