GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/af_vibrato.c Lines: 0 78 0.0 %
Date: 2020-08-11 16:46:18 Branches: 0 38 0.0 %

Line Branch Exec Source
1
/*
2
 * Copyright (c) 2015 Kyle Swanson <k@ylo.ph>.
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with FFmpeg; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20
21
#include "libavutil/opt.h"
22
#include "avfilter.h"
23
#include "internal.h"
24
#include "audio.h"
25
#include "generate_wave_table.h"
26
27
typedef struct VibratoContext {
28
    const AVClass *class;
29
    double freq;
30
    double depth;
31
    int channels;
32
33
    double **buf;
34
    int buf_index;
35
    int buf_size;
36
37
    double *wave_table;
38
    int wave_table_index;
39
    int wave_table_size;
40
} VibratoContext;
41
42
#define OFFSET(x) offsetof(VibratoContext, x)
43
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
44
45
static const AVOption vibrato_options[] = {
46
    { "f", "set frequency in hertz",    OFFSET(freq),    AV_OPT_TYPE_DOUBLE,   {.dbl = 5.0},   0.1,   20000.0, FLAGS },
47
    { "d", "set depth as percentage",   OFFSET(depth),   AV_OPT_TYPE_DOUBLE,   {.dbl = 0.5},   0.00,  1.0,     FLAGS },
48
    { NULL }
49
};
50
51
AVFILTER_DEFINE_CLASS(vibrato);
52
53
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
54
{
55
    AVFilterContext *ctx = inlink->dst;
56
    VibratoContext *s = ctx->priv;
57
    AVFilterLink *outlink = ctx->outputs[0];
58
    AVFrame *out;
59
    int n, c;
60
    const double *src;
61
    double *dst;
62
63
    if (av_frame_is_writable(in)) {
64
        out = in;
65
    } else {
66
        out = ff_get_audio_buffer(outlink, in->nb_samples);
67
        if (!out) {
68
            av_frame_free(&in);
69
            return AVERROR(ENOMEM);
70
        }
71
        av_frame_copy_props(out, in);
72
    }
73
74
75
    for (n = 0; n < in->nb_samples; n++) {
76
        double integer, decimal;
77
        decimal = modf(s->depth * s->wave_table[s->wave_table_index], &integer);
78
79
        s->wave_table_index++;
80
        if (s->wave_table_index >= s->wave_table_size)
81
            s->wave_table_index -= s->wave_table_size;
82
83
        for (c = 0; c < inlink->channels; c++) {
84
            int samp1_index, samp2_index;
85
            double *buf;
86
            double this_samp;
87
88
            src = (const double *)in->extended_data[c];
89
            dst = (double *)out->extended_data[c];
90
            buf = s->buf[c];
91
92
            samp1_index = s->buf_index + integer;
93
            if (samp1_index >= s->buf_size)
94
                samp1_index -= s->buf_size;
95
            samp2_index = samp1_index + 1;
96
            if (samp2_index >= s->buf_size)
97
                samp2_index -= s->buf_size;
98
99
            this_samp = src[n];
100
            dst[n] = buf[samp1_index] + (decimal * (buf[samp2_index] - buf[samp1_index]));
101
            buf[s->buf_index] = this_samp;
102
        }
103
        s->buf_index++;
104
        if (s->buf_index >= s->buf_size)
105
            s->buf_index -= s->buf_size;
106
    }
107
108
    if (in != out)
109
        av_frame_free(&in);
110
111
    return ff_filter_frame(outlink, out);
112
}
113
114
static int query_formats(AVFilterContext *ctx)
115
{
116
    AVFilterFormats *formats;
117
    AVFilterChannelLayouts *layouts;
118
    static const enum AVSampleFormat sample_fmts[] = {
119
        AV_SAMPLE_FMT_DBLP,
120
        AV_SAMPLE_FMT_NONE
121
    };
122
    int ret;
123
124
    layouts = ff_all_channel_counts();
125
    if (!layouts)
126
        return AVERROR(ENOMEM);
127
    ret = ff_set_common_channel_layouts(ctx, layouts);
128
    if (ret < 0)
129
        return ret;
130
131
    formats = ff_make_format_list(sample_fmts);
132
    if (!formats)
133
        return AVERROR(ENOMEM);
134
    ret = ff_set_common_formats(ctx, formats);
135
    if (ret < 0)
136
        return ret;
137
138
    formats = ff_all_samplerates();
139
    if (!formats)
140
        return AVERROR(ENOMEM);
141
    return ff_set_common_samplerates(ctx, formats);
142
}
143
144
static av_cold void uninit(AVFilterContext *ctx)
145
{
146
    VibratoContext *s = ctx->priv;
147
    int c;
148
149
    av_freep(&s->wave_table);
150
    for (c = 0; c < s->channels; c++)
151
        av_freep(&s->buf[c]);
152
    av_freep(&s->buf);
153
}
154
155
static int config_input(AVFilterLink *inlink)
156
{
157
    int c;
158
    AVFilterContext *ctx = inlink->dst;
159
    VibratoContext *s = ctx->priv;
160
    s->channels = inlink->channels;
161
162
    s->buf = av_calloc(inlink->channels, sizeof(*s->buf));
163
    if (!s->buf)
164
        return AVERROR(ENOMEM);
165
    s->buf_size = inlink->sample_rate * 0.005;
166
    for (c = 0; c < s->channels; c++) {
167
        s->buf[c] = av_malloc_array(s->buf_size, sizeof(*s->buf[c]));
168
        if (!s->buf[c])
169
            return AVERROR(ENOMEM);
170
    }
171
    s->buf_index = 0;
172
173
    s->wave_table_size = inlink->sample_rate / s->freq;
174
    s->wave_table = av_malloc_array(s->wave_table_size, sizeof(*s->wave_table));
175
    if (!s->wave_table)
176
        return AVERROR(ENOMEM);
177
    ff_generate_wave_table(WAVE_SIN, AV_SAMPLE_FMT_DBL, s->wave_table, s->wave_table_size, 0.0, s->buf_size - 1, 3.0 * M_PI_2);
178
    s->wave_table_index = 0;
179
180
    return 0;
181
}
182
183
static const AVFilterPad avfilter_af_vibrato_inputs[] = {
184
    {
185
        .name         = "default",
186
        .type         = AVMEDIA_TYPE_AUDIO,
187
        .config_props = config_input,
188
        .filter_frame = filter_frame,
189
    },
190
    { NULL }
191
};
192
193
static const AVFilterPad avfilter_af_vibrato_outputs[] = {
194
    {
195
        .name = "default",
196
        .type = AVMEDIA_TYPE_AUDIO,
197
    },
198
    { NULL }
199
};
200
201
AVFilter ff_af_vibrato = {
202
    .name          = "vibrato",
203
    .description   = NULL_IF_CONFIG_SMALL("Apply vibrato effect."),
204
    .priv_size     = sizeof(VibratoContext),
205
    .priv_class    = &vibrato_class,
206
    .uninit        = uninit,
207
    .query_formats = query_formats,
208
    .inputs        = avfilter_af_vibrato_inputs,
209
    .outputs       = avfilter_af_vibrato_outputs,
210
};