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mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00

avfilter: add vibrato filter

Signed-off-by: Kyle Swanson <k@ylo.ph>
This commit is contained in:
Kyle Swanson 2015-10-24 00:08:19 -05:00 committed by Paul B Mahol
parent 51ee62d50b
commit dcb95ef482
6 changed files with 230 additions and 1 deletions

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@ -26,6 +26,7 @@ version <next>:
- zero-copy Intel QSV transcoding in ffmpeg
- shuffleframes filter
- SDX2 DPCM decoder
- vibrato filter
version 2.8:

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@ -2719,6 +2719,22 @@ Depth of modulation as a percentage. Range is 0.0 - 1.0.
Default value is 0.5.
@end table
@section vibrato
Sinusoidal phase modulation.
The filter accepts the following options:
@table @option
@item f
Modulation frequency in Hertz.
Range is 0.1 - 20000.0. Default value is 5.0 Hz.
@item d
Depth of modulation as a percentage. Range is 0.0 - 1.0.
Default value is 0.5.
@end table
@section volume
Adjust the input audio volume.

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@ -86,6 +86,7 @@ OBJS-$(CONFIG_STEREOTOOLS_FILTER) += af_stereotools.o
OBJS-$(CONFIG_STEREOWIDEN_FILTER) += af_stereowiden.o
OBJS-$(CONFIG_TREBLE_FILTER) += af_biquads.o
OBJS-$(CONFIG_TREMOLO_FILTER) += af_tremolo.o
OBJS-$(CONFIG_VIBRATO_FILTER) += af_vibrato.o generate_wave_table.o
OBJS-$(CONFIG_VOLUME_FILTER) += af_volume.o
OBJS-$(CONFIG_VOLUMEDETECT_FILTER) += af_volumedetect.o

210
libavfilter/af_vibrato.c Normal file
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@ -0,0 +1,210 @@
/*
* 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"
#include "generate_wave_table.h"
typedef struct VibratoContext {
const AVClass *class;
double freq;
double depth;
int channels;
double **buf;
int buf_index;
int buf_size;
double *wave_table;
int wave_table_index;
int wave_table_size;
} VibratoContext;
#define OFFSET(x) offsetof(VibratoContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption vibrato_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}, 0.00, 1.0, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(vibrato);
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
VibratoContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
int n, c;
const double *src;
double *dst;
if (av_frame_is_writable(in)) {
out = in;
} else {
out = ff_get_audio_buffer(inlink, in->nb_samples);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
}
for (n = 0; n < in->nb_samples; n++) {
double integer, decimal;
decimal = modf(s->depth * s->wave_table[s->wave_table_index], &integer);
s->wave_table_index++;
if (s->wave_table_index >= s->wave_table_size)
s->wave_table_index -= s->wave_table_size;
for (c = 0; c < inlink->channels; c++) {
int samp1_index, samp2_index;
double *buf;
double this_samp;
src = (const double *)in->extended_data[c];
dst = (double *)out->extended_data[c];
buf = s->buf[c];
samp1_index = s->buf_index + integer;
if (samp1_index >= s->buf_size)
samp1_index -= s->buf_size;
samp2_index = samp1_index + 1;
if (samp2_index >= s->buf_size)
samp2_index -= s->buf_size;
this_samp = src[n];
dst[n] = buf[samp1_index] + (decimal * (buf[samp2_index] - buf[samp1_index]));
buf[s->buf_index] = this_samp;
}
s->buf_index++;
if (s->buf_index >= s->buf_size)
s->buf_index -= s->buf_size;
}
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_DBLP,
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)
{
VibratoContext *s = ctx->priv;
int c;
av_freep(&s->wave_table);
for (c = 0; c < s->channels; c++)
av_freep(&s->buf[c]);
av_freep(&s->buf);
}
static int config_input(AVFilterLink *inlink)
{
int c;
AVFilterContext *ctx = inlink->dst;
VibratoContext *s = ctx->priv;
s->channels = inlink->channels;
s->buf = av_calloc(inlink->channels, sizeof(*s->buf));
if (!s->buf)
return AVERROR(ENOMEM);
s->buf_size = inlink->sample_rate * 0.005;
for (c = 0; c < s->channels; c++) {
s->buf[c] = av_malloc_array(s->buf_size, sizeof(*s->buf[c]));
if (!s->buf[c])
return AVERROR(ENOMEM);
}
s->buf_index = 0;
s->wave_table_size = inlink->sample_rate / s->freq;
s->wave_table = av_malloc_array(s->wave_table_size, sizeof(*s->wave_table));
if (!s->wave_table)
return AVERROR(ENOMEM);
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);
s->wave_table_index = 0;
return 0;
}
static const AVFilterPad avfilter_af_vibrato_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_af_vibrato_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
{ NULL }
};
AVFilter ff_af_vibrato = {
.name = "vibrato",
.description = NULL_IF_CONFIG_SMALL("Apply vibrato effect."),
.priv_size = sizeof(VibratoContext),
.priv_class = &vibrato_class,
.uninit = uninit,
.query_formats = query_formats,
.inputs = avfilter_af_vibrato_inputs,
.outputs = avfilter_af_vibrato_outputs,
};

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@ -108,6 +108,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(STEREOWIDEN, stereowiden, af);
REGISTER_FILTER(TREBLE, treble, af);
REGISTER_FILTER(TREMOLO, tremolo, af);
REGISTER_FILTER(VIBRATO, vibrato, af);
REGISTER_FILTER(VOLUME, volume, af);
REGISTER_FILTER(VOLUMEDETECT, volumedetect, af);

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@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 6
#define LIBAVFILTER_VERSION_MINOR 13
#define LIBAVFILTER_VERSION_MINOR 14
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \