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/*
* 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/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
enum FilterType {
DC_TYPE,
AC_TYPE,
SQ_TYPE,
PS_TYPE,
NB_TYPES,
};
typedef struct ADenormContext {
const AVClass *class;
double level;
double level_db;
int type;
int64_t in_samples;
void (*filter[NB_TYPES])(AVFilterContext *ctx, void *dst,
const void *src, int nb_samples);
} ADenormContext;
static void dc_denorm_fltp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const float *src = (const float *)srcp;
float *dst = (float *)dstp;
const float dc = s->level;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc;
}
}
static void dc_denorm_dblp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const double *src = (const double *)srcp;
double *dst = (double *)dstp;
const double dc = s->level;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc;
}
}
static void ac_denorm_fltp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const float *src = (const float *)srcp;
float *dst = (float *)dstp;
const float dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * (((N + n) & 1) ? -1.f : 1.f);
}
}
static void ac_denorm_dblp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const double *src = (const double *)srcp;
double *dst = (double *)dstp;
const double dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * (((N + n) & 1) ? -1. : 1.);
}
}
static void sq_denorm_fltp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const float *src = (const float *)srcp;
float *dst = (float *)dstp;
const float dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * ((((N + n) >> 8) & 1) ? -1.f : 1.f);
}
}
static void sq_denorm_dblp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const double *src = (const double *)srcp;
double *dst = (double *)dstp;
const double dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * ((((N + n) >> 8) & 1) ? -1. : 1.);
}
}
static void ps_denorm_fltp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const float *src = (const float *)srcp;
float *dst = (float *)dstp;
const float dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * (((N + n) & 255) ? 0.f : 1.f);
}
}
static void ps_denorm_dblp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const double *src = (const double *)srcp;
double *dst = (double *)dstp;
const double dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * (((N + n) & 255) ? 0. : 1.);
}
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
ADenormContext *s = ctx->priv;
switch (outlink->format) {
case AV_SAMPLE_FMT_FLTP:
s->filter[DC_TYPE] = dc_denorm_fltp;
s->filter[AC_TYPE] = ac_denorm_fltp;
s->filter[SQ_TYPE] = sq_denorm_fltp;
s->filter[PS_TYPE] = ps_denorm_fltp;
break;
case AV_SAMPLE_FMT_DBLP:
s->filter[DC_TYPE] = dc_denorm_dblp;
s->filter[AC_TYPE] = ac_denorm_dblp;
s->filter[SQ_TYPE] = sq_denorm_dblp;
s->filter[PS_TYPE] = ps_denorm_dblp;
break;
default:
av_assert0(0);
}
return 0;
}
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ADenormContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame *out = td->out;
AVFrame *in = td->in;
const int start = (in->ch_layout.nb_channels * jobnr) / nb_jobs;
const int end = (in->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
for (int ch = start; ch < end; ch++) {
s->filter[s->type](ctx, out->extended_data[ch],
in->extended_data[ch],
in->nb_samples);
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
ADenormContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
ThreadData td;
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);
}
s->level = exp(s->level_db / 20. * M_LN10);
td.in = in; td.out = out;
ff_filter_execute(ctx, filter_channels, &td, NULL,
FFMIN(inlink->ch_layout.nb_channels, ff_filter_get_nb_threads(ctx)));
s->in_samples += in->nb_samples;
if (out != in)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad adenorm_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad adenorm_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_output,
},
};
#define OFFSET(x) offsetof(ADenormContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption adenorm_options[] = {
{ "level", "set level", OFFSET(level_db), AV_OPT_TYPE_DOUBLE, {.dbl=-351}, -451, -90, FLAGS },
{ "type", "set type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=DC_TYPE}, 0, NB_TYPES-1, FLAGS, .unit = "type" },
{ "dc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=DC_TYPE}, 0, 0, FLAGS, .unit = "type"},
{ "ac", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AC_TYPE}, 0, 0, FLAGS, .unit = "type"},
{ "square",NULL, 0, AV_OPT_TYPE_CONST, {.i64=SQ_TYPE}, 0, 0, FLAGS, .unit = "type"},
{ "pulse", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PS_TYPE}, 0, 0, FLAGS, .unit = "type"},
{ NULL }
};
AVFILTER_DEFINE_CLASS(adenorm);
const AVFilter ff_af_adenorm = {
.name = "adenorm",
.description = NULL_IF_CONFIG_SMALL("Remedy denormals by adding extremely low-level noise."),
.priv_size = sizeof(ADenormContext),
FILTER_INPUTS(adenorm_inputs),
FILTER_OUTPUTS(adenorm_outputs),
FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP),
.priv_class = &adenorm_class,
.process_command = ff_filter_process_command,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
AVFILTER_FLAG_SLICE_THREADS,
};
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