mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
288 lines
8.7 KiB
C
288 lines
8.7 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2019 The FFmpeg Project
|
||
|
|
*
|
||
|
|
* 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/channel_layout.h"
|
||
|
|
#include "libavutil/opt.h"
|
||
|
|
#include "avfilter.h"
|
||
|
|
#include "audio.h"
|
||
|
|
#include "formats.h"
|
||
|
|
|
||
|
|
enum ASoftClipTypes {
|
||
|
|
ASC_TANH,
|
||
|
|
ASC_ATAN,
|
||
|
|
ASC_CUBIC,
|
||
|
|
ASC_EXP,
|
||
|
|
ASC_ALG,
|
||
|
|
ASC_QUINTIC,
|
||
|
|
ASC_SIN,
|
||
|
|
NB_TYPES,
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef struct ASoftClipContext {
|
||
|
|
const AVClass *class;
|
||
|
|
|
||
|
|
int type;
|
||
|
|
double param;
|
||
|
|
|
||
|
|
void (*filter)(struct ASoftClipContext *s, void **dst, const void **src,
|
||
|
|
int nb_samples, int channels);
|
||
|
|
} ASoftClipContext;
|
||
|
|
|
||
|
|
#define OFFSET(x) offsetof(ASoftClipContext, x)
|
||
|
|
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
|
||
|
|
|
||
|
|
static const AVOption asoftclip_options[] = {
|
||
|
|
{ "type", "set softclip type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_TYPES-1, A, "types" },
|
||
|
|
{ "tanh", NULL, 0, AV_OPT_TYPE_CONST, {.i64=ASC_TANH}, 0, 0, A, "types" },
|
||
|
|
{ "atan", NULL, 0, AV_OPT_TYPE_CONST, {.i64=ASC_ATAN}, 0, 0, A, "types" },
|
||
|
|
{ "cubic", NULL, 0, AV_OPT_TYPE_CONST, {.i64=ASC_CUBIC}, 0, 0, A, "types" },
|
||
|
|
{ "exp", NULL, 0, AV_OPT_TYPE_CONST, {.i64=ASC_EXP}, 0, 0, A, "types" },
|
||
|
|
{ "alg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=ASC_ALG}, 0, 0, A, "types" },
|
||
|
|
{ "quintic", NULL, 0, AV_OPT_TYPE_CONST, {.i64=ASC_QUINTIC},0, 0, A, "types" },
|
||
|
|
{ "sin", NULL, 0, AV_OPT_TYPE_CONST, {.i64=ASC_SIN}, 0, 0, A, "types" },
|
||
|
|
{ "param", "set softclip parameter", OFFSET(param), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.01, 3, A },
|
||
|
|
{ NULL }
|
||
|
|
};
|
||
|
|
|
||
|
|
AVFILTER_DEFINE_CLASS(asoftclip);
|
||
|
|
|
||
|
|
static int query_formats(AVFilterContext *ctx)
|
||
|
|
{
|
||
|
|
AVFilterFormats *formats = NULL;
|
||
|
|
AVFilterChannelLayouts *layouts = NULL;
|
||
|
|
static const enum AVSampleFormat sample_fmts[] = {
|
||
|
|
AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
|
||
|
|
AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,
|
||
|
|
AV_SAMPLE_FMT_NONE
|
||
|
|
};
|
||
|
|
int 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;
|
||
|
|
|
||
|
|
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_all_samplerates();
|
||
|
|
return ff_set_common_samplerates(ctx, formats);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define SQR(x) ((x) * (x))
|
||
|
|
|
||
|
|
static void filter_flt(ASoftClipContext *s,
|
||
|
|
void **dptr, const void **sptr,
|
||
|
|
int nb_samples, int channels)
|
||
|
|
{
|
||
|
|
float param = s->param;
|
||
|
|
|
||
|
|
for (int c = 0; c < channels; c++) {
|
||
|
|
const float *src = sptr[c];
|
||
|
|
float *dst = dptr[c];
|
||
|
|
|
||
|
|
switch (s->type) {
|
||
|
|
case ASC_TANH:
|
||
|
|
for (int n = 0; n < nb_samples; n++) {
|
||
|
|
dst[n] = tanhf(src[n] * param);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case ASC_ATAN:
|
||
|
|
for (int n = 0; n < nb_samples; n++)
|
||
|
|
dst[n] = 2.f / M_PI * atanf(src[n] * param);
|
||
|
|
break;
|
||
|
|
case ASC_CUBIC:
|
||
|
|
for (int n = 0; n < nb_samples; n++) {
|
||
|
|
if (FFABS(src[n]) >= 1.5f)
|
||
|
|
dst[n] = FFSIGN(src[n]);
|
||
|
|
else
|
||
|
|
dst[n] = src[n] - 0.1481f * powf(src[n], 3.f);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case ASC_EXP:
|
||
|
|
for (int n = 0; n < nb_samples; n++)
|
||
|
|
dst[n] = 2.f / (1.f + expf(-2.f * src[n])) - 1.;
|
||
|
|
break;
|
||
|
|
case ASC_ALG:
|
||
|
|
for (int n = 0; n < nb_samples; n++)
|
||
|
|
dst[n] = src[n] / (sqrtf(param + src[n] * src[n]));
|
||
|
|
break;
|
||
|
|
case ASC_QUINTIC:
|
||
|
|
for (int n = 0; n < nb_samples; n++) {
|
||
|
|
if (FFABS(src[n]) >= 1.25)
|
||
|
|
dst[n] = FFSIGN(src[n]);
|
||
|
|
else
|
||
|
|
dst[n] = src[n] - 0.08192f * powf(src[n], 5.f);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case ASC_SIN:
|
||
|
|
for (int n = 0; n < nb_samples; n++) {
|
||
|
|
if (FFABS(src[n]) >= M_PI_2)
|
||
|
|
dst[n] = FFSIGN(src[n]);
|
||
|
|
else
|
||
|
|
dst[n] = sinf(src[n]);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void filter_dbl(ASoftClipContext *s,
|
||
|
|
void **dptr, const void **sptr,
|
||
|
|
int nb_samples, int channels)
|
||
|
|
{
|
||
|
|
double param = s->param;
|
||
|
|
|
||
|
|
for (int c = 0; c < channels; c++) {
|
||
|
|
const double *src = sptr[c];
|
||
|
|
double *dst = dptr[c];
|
||
|
|
|
||
|
|
switch (s->type) {
|
||
|
|
case ASC_TANH:
|
||
|
|
for (int n = 0; n < nb_samples; n++) {
|
||
|
|
dst[n] = tanh(src[n] * param);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case ASC_ATAN:
|
||
|
|
for (int n = 0; n < nb_samples; n++)
|
||
|
|
dst[n] = 2. / M_PI * atan(src[n] * param);
|
||
|
|
break;
|
||
|
|
case ASC_CUBIC:
|
||
|
|
for (int n = 0; n < nb_samples; n++) {
|
||
|
|
if (FFABS(src[n]) >= 1.5)
|
||
|
|
dst[n] = FFSIGN(src[n]);
|
||
|
|
else
|
||
|
|
dst[n] = src[n] - 0.1481 * pow(src[n], 3.);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case ASC_EXP:
|
||
|
|
for (int n = 0; n < nb_samples; n++)
|
||
|
|
dst[n] = 2. / (1. + exp(-2. * src[n])) - 1.;
|
||
|
|
break;
|
||
|
|
case ASC_ALG:
|
||
|
|
for (int n = 0; n < nb_samples; n++)
|
||
|
|
dst[n] = src[n] / (sqrt(param + src[n] * src[n]));
|
||
|
|
break;
|
||
|
|
case ASC_QUINTIC:
|
||
|
|
for (int n = 0; n < nb_samples; n++) {
|
||
|
|
if (FFABS(src[n]) >= 1.25)
|
||
|
|
dst[n] = FFSIGN(src[n]);
|
||
|
|
else
|
||
|
|
dst[n] = src[n] - 0.08192 * pow(src[n], 5.);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case ASC_SIN:
|
||
|
|
for (int n = 0; n < nb_samples; n++) {
|
||
|
|
if (FFABS(src[n]) >= M_PI_2)
|
||
|
|
dst[n] = FFSIGN(src[n]);
|
||
|
|
else
|
||
|
|
dst[n] = sin(src[n]);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int config_input(AVFilterLink *inlink)
|
||
|
|
{
|
||
|
|
AVFilterContext *ctx = inlink->dst;
|
||
|
|
ASoftClipContext *s = ctx->priv;
|
||
|
|
|
||
|
|
switch (inlink->format) {
|
||
|
|
case AV_SAMPLE_FMT_FLT:
|
||
|
|
case AV_SAMPLE_FMT_FLTP: s->filter = filter_flt; break;
|
||
|
|
case AV_SAMPLE_FMT_DBL:
|
||
|
|
case AV_SAMPLE_FMT_DBLP: s->filter = filter_dbl; break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
||
|
|
{
|
||
|
|
AVFilterContext *ctx = inlink->dst;
|
||
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
||
|
|
ASoftClipContext *s = ctx->priv;
|
||
|
|
int nb_samples, channels;
|
||
|
|
AVFrame *out;
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (av_sample_fmt_is_planar(in->format)) {
|
||
|
|
nb_samples = in->nb_samples;
|
||
|
|
channels = in->channels;
|
||
|
|
} else {
|
||
|
|
nb_samples = in->channels * in->nb_samples;
|
||
|
|
channels = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
s->filter(s, (void **)out->extended_data, (const void **)in->extended_data,
|
||
|
|
nb_samples, channels);
|
||
|
|
|
||
|
|
if (out != in)
|
||
|
|
av_frame_free(&in);
|
||
|
|
|
||
|
|
return ff_filter_frame(outlink, out);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const AVFilterPad inputs[] = {
|
||
|
|
{
|
||
|
|
.name = "default",
|
||
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
||
|
|
.filter_frame = filter_frame,
|
||
|
|
.config_props = config_input,
|
||
|
|
},
|
||
|
|
{ NULL }
|
||
|
|
};
|
||
|
|
|
||
|
|
static const AVFilterPad outputs[] = {
|
||
|
|
{
|
||
|
|
.name = "default",
|
||
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
||
|
|
},
|
||
|
|
{ NULL }
|
||
|
|
};
|
||
|
|
|
||
|
|
AVFilter ff_af_asoftclip = {
|
||
|
|
.name = "asoftclip",
|
||
|
|
.description = NULL_IF_CONFIG_SMALL("Audio Soft Clipper."),
|
||
|
|
.query_formats = query_formats,
|
||
|
|
.priv_size = sizeof(ASoftClipContext),
|
||
|
|
.priv_class = &asoftclip_class,
|
||
|
|
.inputs = inputs,
|
||
|
|
.outputs = outputs,
|
||
|
|
};
|