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GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/acelp_pitch_delay.c	Lines:	28	62	45.2 %
Date:	2020-01-28 04:56:05	Branches:	17	32	53.1 %


/*
 * gain code, gain pitch and pitch delay decoding
 *
 * Copyright (c) 2008 Vladimir Voroshilov
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/common.h"
#include "libavutil/ffmath.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mathematics.h"
#include "avcodec.h"
#include "acelp_pitch_delay.h"
#include "celp_math.h"
#include "audiodsp.h"

int ff_acelp_decode_8bit_to_1st_delay3(int ac_index)
{
    ac_index += 58;
    if(ac_index > 254)
        ac_index = 3 * ac_index - 510;
    return ac_index;
}

int ff_acelp_decode_4bit_to_2nd_delay3(
        int ac_index,
        int pitch_delay_min)
{
    if(ac_index < 4)
        return 3 * (ac_index + pitch_delay_min);
    else if(ac_index < 12)
        return 3 * pitch_delay_min + ac_index + 6;
    else
        return 3 * (ac_index + pitch_delay_min) - 18;
}

int ff_acelp_decode_5_6_bit_to_2nd_delay3(
        int ac_index,
        int pitch_delay_min)
{
        return 3 * pitch_delay_min + ac_index - 2;
}

int ff_acelp_decode_9bit_to_1st_delay6(int ac_index)
{
    if(ac_index < 463)
        return ac_index + 105;
    else
        return 6 * (ac_index - 368);
}
int ff_acelp_decode_6bit_to_2nd_delay6(
        int ac_index,
        int pitch_delay_min)
{
    return 6 * pitch_delay_min + ac_index - 3;
}

void ff_acelp_update_past_gain(
    int16_t* quant_energy,
    int gain_corr_factor,
    int log2_ma_pred_order,
    int erasure)
{
    int i;
    int avg_gain=quant_energy[(1 << log2_ma_pred_order) - 1]; // (5.10)

    for(i=(1 << log2_ma_pred_order) - 1; i>0; i--)
    {
        avg_gain       += quant_energy[i-1];
        quant_energy[i] = quant_energy[i-1];
    }

    if(erasure)
        quant_energy[0] = FFMAX(avg_gain >> log2_ma_pred_order, -10240) - 4096; // -10 and -4 in (5.10)
    else
        quant_energy[0] = (6165 * ((ff_log2_q15(gain_corr_factor) >> 2) - (13 << 13))) >> 13;
}

int16_t ff_acelp_decode_gain_code(
    AudioDSPContext *adsp,
    int gain_corr_factor,
    const int16_t* fc_v,
    int mr_energy,
    const int16_t* quant_energy,
    const int16_t* ma_prediction_coeff,
    int subframe_size,
    int ma_pred_order)
{
    int i;

    mr_energy <<= 10;

    for(i=0; i<ma_pred_order; i++)
        mr_energy += quant_energy[i] * ma_prediction_coeff[i];

#ifdef G729_BITEXACT
    mr_energy += (((-6165LL * ff_log2(dsp->scalarproduct_int16(fc_v, fc_v, subframe_size, 0))) >> 3) & ~0x3ff);

    mr_energy = (5439 * (mr_energy >> 15)) >> 8;           // (0.15) = (0.15) * (7.23)

    return bidir_sal(
               ((ff_exp2(mr_energy & 0x7fff) + 16) >> 5) * (gain_corr_factor >> 1),
               (mr_energy >> 15) - 25
           );
#else
    mr_energy = gain_corr_factor * ff_exp10((double)mr_energy / (20 << 23)) /
                sqrt(adsp->scalarproduct_int16(fc_v, fc_v, subframe_size));
    return mr_energy >> 12;
#endif
}

float ff_amr_set_fixed_gain(float fixed_gain_factor, float fixed_mean_energy,
                            float *prediction_error, float energy_mean,
                            const float *pred_table)
{
    // Equations 66-69:
    // ^g_c = ^gamma_gc * 100.05 (predicted dB + mean dB - dB of fixed vector)
    // Note 10^(0.05 * -10log(average x2)) = 1/sqrt((average x2)).
    float val = fixed_gain_factor *
        ff_exp10(0.05 *
              (avpriv_scalarproduct_float_c(pred_table, prediction_error, 4) +
               energy_mean)) /
        sqrtf(fixed_mean_energy ? fixed_mean_energy : 1.0);

    // update quantified prediction error energy history
    memmove(&prediction_error[0], &prediction_error[1],
            3 * sizeof(prediction_error[0]));
    prediction_error[3] = 20.0 * log10f(fixed_gain_factor);

    return val;
}

void ff_decode_pitch_lag(int *lag_int, int *lag_frac, int pitch_index,
                         const int prev_lag_int, const int subframe,
                         int third_as_first, int resolution)
{
    /* Note n * 10923 >> 15 is floor(x/3) for 0 <= n <= 32767 */
    if (subframe == 0 || (subframe == 2 && third_as_first)) {

        if (pitch_index < 197)
            pitch_index += 59;
        else
            pitch_index = 3 * pitch_index - 335;

    } else {
        if (resolution == 4) {
            int search_range_min = av_clip(prev_lag_int - 5, PITCH_DELAY_MIN,
                                           PITCH_DELAY_MAX - 9);

            // decoding with 4-bit resolution
            if (pitch_index < 4) {
                // integer only precision for [search_range_min, search_range_min+3]
                pitch_index = 3 * (pitch_index + search_range_min) + 1;
            } else if (pitch_index < 12) {
                // 1/3 fractional precision for [search_range_min+3 1/3, search_range_min+5 2/3]
                pitch_index += 3 * search_range_min + 7;
            } else {
                // integer only precision for [search_range_min+6, search_range_min+9]
                pitch_index = 3 * (pitch_index + search_range_min - 6) + 1;
            }
        } else {
            // decoding with 5 or 6 bit resolution, 1/3 fractional precision
            pitch_index--;

            if (resolution == 5) {
                pitch_index += 3 * av_clip(prev_lag_int - 10, PITCH_DELAY_MIN,
                                           PITCH_DELAY_MAX - 19);
            } else
                pitch_index += 3 * av_clip(prev_lag_int - 5, PITCH_DELAY_MIN,
                                           PITCH_DELAY_MAX - 9);
        }
    }
    *lag_int  = pitch_index * 10923 >> 15;
    *lag_frac = pitch_index - 3 * *lag_int - 1;
}


Generated by: GCOVR (Version 4.1)

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 "libavutil/mathematics.h"
27			#include "avcodec.h"
28			#include "acelp_pitch_delay.h"
29			#include "celp_math.h"
30			#include "audiodsp.h"
31
32			int ff_acelp_decode_8bit_to_1st_delay3(int ac_index)
33			{
34			ac_index += 58;
35			if(ac_index > 254)
36			ac_index = 3 * ac_index - 510;
37			return ac_index;
38			}
39
40			int ff_acelp_decode_4bit_to_2nd_delay3(
41			int ac_index,
42			int pitch_delay_min)
43			{
44			if(ac_index < 4)
45			return 3 * (ac_index + pitch_delay_min);
46			else if(ac_index < 12)
47			return 3 * pitch_delay_min + ac_index + 6;
48			else
49			return 3 * (ac_index + pitch_delay_min) - 18;
50			}
51
52			int ff_acelp_decode_5_6_bit_to_2nd_delay3(
53			int ac_index,
54			int pitch_delay_min)
55			{
56			return 3 * pitch_delay_min + ac_index - 2;
57			}
58
59			int ff_acelp_decode_9bit_to_1st_delay6(int ac_index)
60			{
61			if(ac_index < 463)
62			return ac_index + 105;
63			else
64			return 6 * (ac_index - 368);
65			}
66			int ff_acelp_decode_6bit_to_2nd_delay6(
67			int ac_index,
68			int pitch_delay_min)
69			{
70			return 6 * pitch_delay_min + ac_index - 3;
71			}
72
73			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			int avg_gain=quant_energy[(1 << log2_ma_pred_order) - 1]; // (5.10)
81
82			for(i=(1 << log2_ma_pred_order) - 1; i>0; i--)
83			{
84			avg_gain += quant_energy[i-1];
85			quant_energy[i] = quant_energy[i-1];
86			}
87
88			if(erasure)
89			quant_energy[0] = FFMAX(avg_gain >> log2_ma_pred_order, -10240) - 4096; // -10 and -4 in (5.10)
90			else
91			quant_energy[0] = (6165 * ((ff_log2_q15(gain_corr_factor) >> 2) - (13 << 13))) >> 13;
92			}
93
94			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			mr_energy <<= 10;
107
108			for(i=0; i<ma_pred_order; i++)
109			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			mr_energy = gain_corr_factor * ff_exp10((double)mr_energy / (20 << 23)) /
122			sqrt(adsp->scalarproduct_int16(fc_v, fc_v, subframe_size));
123			return mr_energy >> 12;
124			#endif
125			}
126
127		51008	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		153024	float val = fixed_gain_factor *
135		51008	ff_exp10(0.05 *
136		51008	(avpriv_scalarproduct_float_c(pred_table, prediction_error, 4) +
137		51008	energy_mean)) /
138	✓✗	51008	sqrtf(fixed_mean_energy ? fixed_mean_energy : 1.0);
139
140			// update quantified prediction error energy history
141		51008	memmove(&prediction_error[0], &prediction_error[1],
142			3 * sizeof(prediction_error[0]));
143		51008	prediction_error[3] = 20.0 * log10f(fixed_gain_factor);
144
145		51008	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	✓✓	9264	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	}