FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/acelp_pitch_delay.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 28 44 63.6%
Functions: 2 4 50.0%
Branches: 17 24 70.8%
Line Branch Exec Source
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 "acelp_pitch_delay.h"
27 #include "celp_math.h"
28 #include "audiodsp.h"
29
30 ✗ void ff_acelp_update_past_gain(
31 int16_t* quant_energy,
32 int gain_corr_factor,
33 int log2_ma_pred_order,
34 int erasure)
35 {
36 int i;
37 ✗ int avg_gain=quant_energy[(1 << log2_ma_pred_order) - 1]; // (5.10)
38
39 ✗ for(i=(1 << log2_ma_pred_order) - 1; i>0; i--)
40 {
41 ✗ avg_gain += quant_energy[i-1];
42 ✗ quant_energy[i] = quant_energy[i-1];
43 }
44
45 ✗ if(erasure)
46 ✗ quant_energy[0] = FFMAX(avg_gain >> log2_ma_pred_order, -10240) - 4096; // -10 and -4 in (5.10)
47 else
48 ✗ quant_energy[0] = (6165 * ((ff_log2_q15(gain_corr_factor) >> 2) - (13 << 13))) >> 13;
49 ✗ }
50
51 ✗ int16_t ff_acelp_decode_gain_code(
52 AudioDSPContext *adsp,
53 int gain_corr_factor,
54 const int16_t* fc_v,
55 int mr_energy,
56 const int16_t* quant_energy,
57 const int16_t* ma_prediction_coeff,
58 int subframe_size,
59 int ma_pred_order)
60 {
61 int i;
62
63 ✗ mr_energy <<= 10;
64
65 ✗ for(i=0; i<ma_pred_order; i++)
66 ✗ mr_energy += quant_energy[i] * ma_prediction_coeff[i];
67
68 #ifdef G729_BITEXACT
69 mr_energy += (((-6165LL * ff_log2(dsp->scalarproduct_int16(fc_v, fc_v, subframe_size, 0))) >> 3) & ~0x3ff);
70
71 mr_energy = (5439 * (mr_energy >> 15)) >> 8; // (0.15) = (0.15) * (7.23)
72
73 return bidir_sal(
74 ((ff_exp2(mr_energy & 0x7fff) + 16) >> 5) * (gain_corr_factor >> 1),
75 (mr_energy >> 15) - 25
76 );
77 #else
78 ✗ mr_energy = gain_corr_factor * ff_exp10((double)mr_energy / (20 << 23)) /
79 ✗ sqrt(adsp->scalarproduct_int16(fc_v, fc_v, subframe_size));
80 ✗ return mr_energy >> 12;
81 #endif
82 }
83
84 51126 float ff_amr_set_fixed_gain(float fixed_gain_factor, float fixed_mean_energy,
85 float *prediction_error, float energy_mean,
86 const float *pred_table)
87 {
88 // Equations 66-69:
89 // ^g_c = ^gamma_gc * 100.05 (predicted dB + mean dB - dB of fixed vector)
90 // Note 10^(0.05 * -10log(average x2)) = 1/sqrt((average x2)).
91 153378 float val = fixed_gain_factor *
92 51126 ff_exp10(0.05 *
93 51126 (avpriv_scalarproduct_float_c(pred_table, prediction_error, 4) +
94 51126 energy_mean)) /
95
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 51126 sqrtf(fixed_mean_energy ? fixed_mean_energy : 1.0);
96
97 // update quantified prediction error energy history
98 51126 memmove(&prediction_error[0], &prediction_error[1],
99 3 * sizeof(prediction_error[0]));
100 51126 prediction_error[3] = 20.0 * log10f(fixed_gain_factor);
101
102 51126 return val;
103 }
104
105 24914 void ff_decode_pitch_lag(int *lag_int, int *lag_frac, int pitch_index,
106 const int prev_lag_int, const int subframe,
107 int third_as_first, int resolution)
108 {
109 /* Note n * 10923 >> 15 is floor(x/3) for 0 <= n <= 32767 */
110
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 24914 if (subframe == 0 || (subframe == 2 && third_as_first)) {
111
112
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 9290 if (pitch_index < 197)
113 7181 pitch_index += 59;
114 else
115 2109 pitch_index = 3 * pitch_index - 335;
116
117 } else {
118
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 15624 if (resolution == 4) {
119 2856 int search_range_min = av_clip(prev_lag_int - 5, PITCH_DELAY_MIN,
120 PITCH_DELAY_MAX - 9);
121
122 // decoding with 4-bit resolution
123
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 2856 if (pitch_index < 4) {
124 // integer only precision for [search_range_min, search_range_min+3]
125 626 pitch_index = 3 * (pitch_index + search_range_min) + 1;
126
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 2230 } else if (pitch_index < 12) {
127 // 1/3 fractional precision for [search_range_min+3 1/3, search_range_min+5 2/3]
128 1328 pitch_index += 3 * search_range_min + 7;
129 } else {
130 // integer only precision for [search_range_min+6, search_range_min+9]
131 902 pitch_index = 3 * (pitch_index + search_range_min - 6) + 1;
132 }
133 } else {
134 // decoding with 5 or 6 bit resolution, 1/3 fractional precision
135 12768 pitch_index--;
136
137
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 12768 if (resolution == 5) {
138 570 pitch_index += 3 * av_clip(prev_lag_int - 10, PITCH_DELAY_MIN,
139 PITCH_DELAY_MAX - 19);
140 } else
141 12198 pitch_index += 3 * av_clip(prev_lag_int - 5, PITCH_DELAY_MIN,
142 PITCH_DELAY_MAX - 9);
143 }
144 }
145 24914 *lag_int = pitch_index * 10923 >> 15;
146 24914 *lag_frac = pitch_index - 3 * *lag_int - 1;
147 24914 }
148