mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
88cbd25b19
This is more correct. Signed-off-by: Paul B Mahol <onemda@gmail.com>
211 lines
5.9 KiB
C
211 lines
5.9 KiB
C
/*
|
|
* 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(outlink, 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,
|
|
};
|