FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavfilter/af_tremolo.c	Lines:	49	61	80.3 %
Date:	2020-10-23 17:01:47	Branches:	16	26	61.5 %


/*
 * Copyright (c) 2015 Kyle Swanson <k@ylo.ph>.
 *
 * 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/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "audio.h"

typedef struct TremoloContext {
    const AVClass *class;
    double freq;
    double depth;
    double *table;
    int table_size;
    int index;
} TremoloContext;

#define OFFSET(x) offsetof(TremoloContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

static const AVOption tremolo_options[] = {
    { "f", "set frequency in hertz",    OFFSET(freq),    AV_OPT_TYPE_DOUBLE,   {.dbl = 5.0},   0.1,   20000.0, FLAGS },
    { "d", "set depth as percentage",   OFFSET(depth),   AV_OPT_TYPE_DOUBLE,   {.dbl = 0.5},   0.0,   1.0,     FLAGS },
    { NULL }
};

AVFILTER_DEFINE_CLASS(tremolo);

static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
    AVFilterContext *ctx = inlink->dst;
    AVFilterLink *outlink = ctx->outputs[0];
    TremoloContext *s = ctx->priv;
    const double *src = (const double *)in->data[0];
    const int channels = inlink->channels;
    const int nb_samples = in->nb_samples;
    AVFrame *out;
    double *dst;
    int n, c;

    if (av_frame_is_writable(in)) {
        out = in;
    } else {
        out = ff_get_audio_buffer(outlink, in->nb_samples);
        if (!out) {
            av_frame_free(&in);
            return AVERROR(ENOMEM);
        }
        av_frame_copy_props(out, in);
    }
    dst = (double *)out->data[0];

    for (n = 0; n < nb_samples; n++) {
        for (c = 0; c < channels; c++)
            dst[c] = src[c] * s->table[s->index];
        dst += channels;
        src += channels;
        s->index++;
        if (s->index >= s->table_size)
            s->index = 0;
    }

    if (in != out)
        av_frame_free(&in);

    return ff_filter_frame(outlink, out);
}

static int query_formats(AVFilterContext *ctx)
{
    AVFilterFormats *formats;
    AVFilterChannelLayouts *layouts;
    static const enum AVSampleFormat sample_fmts[] = {
        AV_SAMPLE_FMT_DBL,
        AV_SAMPLE_FMT_NONE
    };
    int ret;

    layouts = ff_all_channel_counts();
    if (!layouts)
        return AVERROR(ENOMEM);
    ret = ff_set_common_channel_layouts(ctx, layouts);
    if (ret < 0)
        return ret;

    formats = ff_make_format_list(sample_fmts);
    if (!formats)
        return AVERROR(ENOMEM);
    ret = ff_set_common_formats(ctx, formats);
    if (ret < 0)
        return ret;

    formats = ff_all_samplerates();
    if (!formats)
        return AVERROR(ENOMEM);
    return ff_set_common_samplerates(ctx, formats);
}

static av_cold void uninit(AVFilterContext *ctx)
{
    TremoloContext *s = ctx->priv;
    av_freep(&s->table);
}

static int config_input(AVFilterLink *inlink)
{
    AVFilterContext *ctx = inlink->dst;
    TremoloContext *s = ctx->priv;
    const double offset = 1. - s->depth / 2.;
    int i;

    s->table_size = inlink->sample_rate / s->freq;
    s->table = av_malloc_array(s->table_size, sizeof(*s->table));
    if (!s->table)
        return AVERROR(ENOMEM);

    for (i = 0; i < s->table_size; i++) {
        double env = s->freq * i / inlink->sample_rate;
        env = sin(2 * M_PI * fmod(env + 0.25, 1.0));
        s->table[i] = env * (1 - fabs(offset)) + offset;
    }

    s->index = 0;

    return 0;
}

static const AVFilterPad avfilter_af_tremolo_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .config_props = config_input,
        .filter_frame = filter_frame,
    },
    { NULL }
};

static const AVFilterPad avfilter_af_tremolo_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_AUDIO,
    },
    { NULL }
};

AVFilter ff_af_tremolo = {
    .name          = "tremolo",
    .description   = NULL_IF_CONFIG_SMALL("Apply tremolo effect."),
    .priv_size     = sizeof(TremoloContext),
    .priv_class    = &tremolo_class,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = avfilter_af_tremolo_inputs,
    .outputs       = avfilter_af_tremolo_outputs,
};


Generated by: GCOVR (Version 4.2)

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
26			typedef struct TremoloContext {
27			const AVClass *class;
28			double freq;
29			double depth;
30			double *table;
31			int table_size;
32			int index;
33			} TremoloContext;
34
35			#define OFFSET(x) offsetof(TremoloContext, x)
36			#define FLAGS AV_OPT_FLAG_AUDIO_PARAM\|AV_OPT_FLAG_FILTERING_PARAM
37
38			static const AVOption tremolo_options[] = {
39			{ "f", "set frequency in hertz", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl = 5.0}, 0.1, 20000.0, FLAGS },
40			{ "d", "set depth as percentage", OFFSET(depth), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.0, 1.0, FLAGS },
41			{ NULL }
42			};
43
44			AVFILTER_DEFINE_CLASS(tremolo);
45
46		20	static int filter_frame(AVFilterLink inlink, AVFrame in)
47			{
48		20	AVFilterContext *ctx = inlink->dst;
49		20	AVFilterLink *outlink = ctx->outputs[0];
50		20	TremoloContext *s = ctx->priv;
51		20	const double src = (const double )in->data[0];
52		20	const int channels = inlink->channels;
53		20	const int nb_samples = in->nb_samples;
54			AVFrame *out;
55			double *dst;
56			int n, c;
57
58	✓✗	20	if (av_frame_is_writable(in)) {
59		20	out = in;
60			} else {
61			out = ff_get_audio_buffer(outlink, in->nb_samples);
62			if (!out) {
63			av_frame_free(&in);
64			return AVERROR(ENOMEM);
65			}
66			av_frame_copy_props(out, in);
67			}
68		20	dst = (double *)out->data[0];
69
70	✓✓	20500	for (n = 0; n < nb_samples; n++) {
71	✓✓	61440	for (c = 0; c < channels; c++)
72		40960	dst[c] = src[c] * s->table[s->index];
73		20480	dst += channels;
74		20480	src += channels;
75		20480	s->index++;
76	✓✓	20480	if (s->index >= s->table_size)
77		2	s->index = 0;
78			}
79
80	✗✓	20	if (in != out)
81			av_frame_free(&in);
82
83		20	return ff_filter_frame(outlink, out);
84			}
85
86		1	static int query_formats(AVFilterContext *ctx)
87			{
88			AVFilterFormats *formats;
89			AVFilterChannelLayouts *layouts;
90			static const enum AVSampleFormat sample_fmts[] = {
91			AV_SAMPLE_FMT_DBL,
92			AV_SAMPLE_FMT_NONE
93			};
94			int ret;
95
96		1	layouts = ff_all_channel_counts();
97	✗✓	1	if (!layouts)
98			return AVERROR(ENOMEM);
99		1	ret = ff_set_common_channel_layouts(ctx, layouts);
100	✗✓	1	if (ret < 0)
101			return ret;
102
103		1	formats = ff_make_format_list(sample_fmts);
104	✗✓	1	if (!formats)
105			return AVERROR(ENOMEM);
106		1	ret = ff_set_common_formats(ctx, formats);
107	✗✓	1	if (ret < 0)
108			return ret;
109
110		1	formats = ff_all_samplerates();
111	✗✓	1	if (!formats)
112			return AVERROR(ENOMEM);
113		1	return ff_set_common_samplerates(ctx, formats);
114			}
115
116		1	static av_cold void uninit(AVFilterContext *ctx)
117			{
118		1	TremoloContext *s = ctx->priv;
119		1	av_freep(&s->table);
120		1	}
121
122		1	static int config_input(AVFilterLink *inlink)
123			{
124		1	AVFilterContext *ctx = inlink->dst;
125		1	TremoloContext *s = ctx->priv;
126		1	const double offset = 1. - s->depth / 2.;
127			int i;
128
129		1	s->table_size = inlink->sample_rate / s->freq;
130		1	s->table = av_malloc_array(s->table_size, sizeof(*s->table));
131	✗✓	1	if (!s->table)
132			return AVERROR(ENOMEM);
133
134	✓✓	8821	for (i = 0; i < s->table_size; i++) {
135		8820	double env = s->freq * i / inlink->sample_rate;
136		8820	env = sin(2 * M_PI * fmod(env + 0.25, 1.0));
137		8820	s->table[i] = env * (1 - fabs(offset)) + offset;
138			}
139
140		1	s->index = 0;
141
142		1	return 0;
143			}
144
145			static const AVFilterPad avfilter_af_tremolo_inputs[] = {
146			{
147			.name = "default",
148			.type = AVMEDIA_TYPE_AUDIO,
149			.config_props = config_input,
150			.filter_frame = filter_frame,
151			},
152			{ NULL }
153			};
154
155			static const AVFilterPad avfilter_af_tremolo_outputs[] = {
156			{
157			.name = "default",
158			.type = AVMEDIA_TYPE_AUDIO,
159			},
160			{ NULL }
161			};
162
163			AVFilter ff_af_tremolo = {
164			.name = "tremolo",
165			.description = NULL_IF_CONFIG_SMALL("Apply tremolo effect."),
166			.priv_size = sizeof(TremoloContext),
167			.priv_class = &tremolo_class,
168			.uninit = uninit,
169			.query_formats = query_formats,
170			.inputs = avfilter_af_tremolo_inputs,
171			.outputs = avfilter_af_tremolo_outputs,
172			};