GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/af_compensationdelay.c Lines: 0 66 0.0 %
Date: 2020-09-25 23:16:12 Branches: 0 20 0.0 %

Line Branch Exec Source
1
/*
2
 * Copyright (c) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen, Vladimir Sadovnikov and others
3
 * Copyright (c) 2015 Paul B Mahol
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
22
#include "libavutil/opt.h"
23
#include "libavutil/samplefmt.h"
24
#include "avfilter.h"
25
#include "audio.h"
26
#include "internal.h"
27
28
typedef struct CompensationDelayContext {
29
    const AVClass *class;
30
    int distance_mm;
31
    int distance_cm;
32
    int distance_m;
33
    double dry, wet;
34
    int temp;
35
36
    unsigned delay;
37
    unsigned w_ptr;
38
    unsigned buf_size;
39
    AVFrame *delay_frame;
40
} CompensationDelayContext;
41
42
#define OFFSET(x) offsetof(CompensationDelayContext, x)
43
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
44
45
static const AVOption compensationdelay_options[] = {
46
    { "mm",   "set mm distance",    OFFSET(distance_mm), AV_OPT_TYPE_INT,    {.i64=0},    0,  10, A },
47
    { "cm",   "set cm distance",    OFFSET(distance_cm), AV_OPT_TYPE_INT,    {.i64=0},    0, 100, A },
48
    { "m",    "set meter distance", OFFSET(distance_m),  AV_OPT_TYPE_INT,    {.i64=0},    0, 100, A },
49
    { "dry",  "set dry amount",     OFFSET(dry),         AV_OPT_TYPE_DOUBLE, {.dbl=0},    0,   1, A },
50
    { "wet",  "set wet amount",     OFFSET(wet),         AV_OPT_TYPE_DOUBLE, {.dbl=1},    0,   1, A },
51
    { "temp", "set temperature °C", OFFSET(temp),        AV_OPT_TYPE_INT,    {.i64=20}, -50,  50, A },
52
    { NULL }
53
};
54
55
AVFILTER_DEFINE_CLASS(compensationdelay);
56
57
// The maximum distance for options
58
#define COMP_DELAY_MAX_DISTANCE            (100.0 * 100.0 + 100.0 * 1.0 + 1.0)
59
// The actual speed of sound in normal conditions
60
#define COMP_DELAY_SOUND_SPEED_KM_H(temp)  1.85325 * (643.95 * sqrt(((temp + 273.15) / 273.15)))
61
#define COMP_DELAY_SOUND_SPEED_CM_S(temp)  (COMP_DELAY_SOUND_SPEED_KM_H(temp) * (1000.0 * 100.0) /* cm/km */ / (60.0 * 60.0) /* s/h */)
62
#define COMP_DELAY_SOUND_FRONT_DELAY(temp) (1.0 / COMP_DELAY_SOUND_SPEED_CM_S(temp))
63
// The maximum delay may be reached by this filter
64
#define COMP_DELAY_MAX_DELAY               (COMP_DELAY_MAX_DISTANCE * COMP_DELAY_SOUND_FRONT_DELAY(50))
65
66
static int query_formats(AVFilterContext *ctx)
67
{
68
    AVFilterChannelLayouts *layouts;
69
    AVFilterFormats *formats;
70
    static const enum AVSampleFormat sample_fmts[] = {
71
        AV_SAMPLE_FMT_DBLP,
72
        AV_SAMPLE_FMT_NONE
73
    };
74
    int ret;
75
76
    layouts = ff_all_channel_counts();
77
    if (!layouts)
78
        return AVERROR(ENOMEM);
79
    ret = ff_set_common_channel_layouts(ctx, layouts);
80
    if (ret < 0)
81
        return ret;
82
83
    formats = ff_make_format_list(sample_fmts);
84
    if (!formats)
85
        return AVERROR(ENOMEM);
86
    ret = ff_set_common_formats(ctx, formats);
87
    if (ret < 0)
88
        return ret;
89
90
    formats = ff_all_samplerates();
91
    if (!formats)
92
        return AVERROR(ENOMEM);
93
    return ff_set_common_samplerates(ctx, formats);
94
}
95
96
static int config_input(AVFilterLink *inlink)
97
{
98
    AVFilterContext *ctx = inlink->dst;
99
    CompensationDelayContext *s = ctx->priv;
100
    unsigned min_size, new_size = 1;
101
102
    s->delay = (s->distance_m * 100. + s->distance_cm * 1. + s->distance_mm * .1) *
103
               COMP_DELAY_SOUND_FRONT_DELAY(s->temp) * inlink->sample_rate;
104
    min_size = inlink->sample_rate * COMP_DELAY_MAX_DELAY;
105
106
    while (new_size < min_size)
107
        new_size <<= 1;
108
109
    s->delay_frame = av_frame_alloc();
110
    if (!s->delay_frame)
111
        return AVERROR(ENOMEM);
112
113
    s->buf_size                    = new_size;
114
    s->delay_frame->format         = inlink->format;
115
    s->delay_frame->nb_samples     = new_size;
116
    s->delay_frame->channel_layout = inlink->channel_layout;
117
118
    return av_frame_get_buffer(s->delay_frame, 0);
119
}
120
121
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
122
{
123
    AVFilterContext *ctx = inlink->dst;
124
    CompensationDelayContext *s = ctx->priv;
125
    const unsigned b_mask = s->buf_size - 1;
126
    const unsigned buf_size = s->buf_size;
127
    const unsigned delay = s->delay;
128
    const double dry = s->dry;
129
    const double wet = s->wet;
130
    unsigned r_ptr, w_ptr = 0;
131
    AVFrame *out;
132
    int n, ch;
133
134
    out = ff_get_audio_buffer(ctx->outputs[0], in->nb_samples);
135
    if (!out) {
136
        av_frame_free(&in);
137
        return AVERROR(ENOMEM);
138
    }
139
    av_frame_copy_props(out, in);
140
141
    for (ch = 0; ch < inlink->channels; ch++) {
142
        const double *src = (const double *)in->extended_data[ch];
143
        double *dst = (double *)out->extended_data[ch];
144
        double *buffer = (double *)s->delay_frame->extended_data[ch];
145
146
        w_ptr =  s->w_ptr;
147
        r_ptr = (w_ptr + buf_size - delay) & b_mask;
148
149
        for (n = 0; n < in->nb_samples; n++) {
150
            const double sample = src[n];
151
152
            buffer[w_ptr] = sample;
153
            dst[n] = dry * sample + wet * buffer[r_ptr];
154
            w_ptr = (w_ptr + 1) & b_mask;
155
            r_ptr = (r_ptr + 1) & b_mask;
156
        }
157
    }
158
    s->w_ptr = w_ptr;
159
160
    av_frame_free(&in);
161
    return ff_filter_frame(ctx->outputs[0], out);
162
}
163
164
static av_cold void uninit(AVFilterContext *ctx)
165
{
166
    CompensationDelayContext *s = ctx->priv;
167
168
    av_frame_free(&s->delay_frame);
169
}
170
171
static const AVFilterPad compensationdelay_inputs[] = {
172
    {
173
        .name         = "default",
174
        .type         = AVMEDIA_TYPE_AUDIO,
175
        .config_props = config_input,
176
        .filter_frame = filter_frame,
177
    },
178
    { NULL }
179
};
180
181
static const AVFilterPad compensationdelay_outputs[] = {
182
    {
183
        .name = "default",
184
        .type = AVMEDIA_TYPE_AUDIO,
185
    },
186
    { NULL }
187
};
188
189
AVFilter ff_af_compensationdelay = {
190
    .name          = "compensationdelay",
191
    .description   = NULL_IF_CONFIG_SMALL("Audio Compensation Delay Line."),
192
    .query_formats = query_formats,
193
    .priv_size     = sizeof(CompensationDelayContext),
194
    .priv_class    = &compensationdelay_class,
195
    .uninit        = uninit,
196
    .inputs        = compensationdelay_inputs,
197
    .outputs       = compensationdelay_outputs,
198
};