/*
* Copyright (c) 2016 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"
typedef struct CrystalizerContext {
const AVClass *class;
float mult;
int clip;
AVFrame *prev;
int (*filter[2][2])(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} CrystalizerContext;
#define OFFSET(x) offsetof(CrystalizerContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption crystalizer_options[] = {
{ "i", "set intensity", OFFSET(mult), AV_OPT_TYPE_FLOAT, {.dbl=2.0},-10, 10, A },
{ "c", "enable clipping", OFFSET(clip), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, A },
{ NULL }
};
AVFILTER_DEFINE_CLASS(crystalizer);
typedef struct ThreadData {
void **d;
void **p;
const void **s;
int nb_samples;
int channels;
float mult;
} ThreadData;
#define filters(fmt, type, inverse, clp, inverset, clip, one, clip_fn, packed) \
static int filter_## inverse ##_## fmt ##_## clp(AVFilterContext *ctx, \
void *arg, int jobnr,\
int nb_jobs) \
{ \
ThreadData *td = arg; \
void **d = td->d; \
void **p = td->p; \
const void **s = td->s; \
const int nb_samples = td->nb_samples; \
const int channels = td->channels; \
const type mult = td->mult; \
const type scale = one / (-mult + one); \
const int start = (channels * jobnr) / nb_jobs; \
const int end = (channels * (jobnr+1)) / nb_jobs; \
\
if (packed) { \
type *prv = p[0]; \
for (int c = start; c < end; c++) { \
const type *src = s[0]; \
type *dst = d[0]; \
\
for (int n = 0; n < nb_samples; n++) { \
type current = src[c]; \
\
if (inverset) { \
dst[c] = (current - prv[c] * mult) * scale; \
prv[c] = dst[c]; \
} else { \
dst[c] = current + (current - prv[c]) * mult; \
prv[c] = current; \
} \
if (clip) { \
dst[c] = clip_fn(dst[c], -one, one); \
} \
\
dst += channels; \
src += channels; \
} \
} \
} else { \
for (int c = start; c < end; c++) { \
const type *src = s[c]; \
type *dst = d[c]; \
type *prv = p[c]; \
\
for (int n = 0; n < nb_samples; n++) { \
type current = src[n]; \
\
if (inverset) { \
dst[n] = (current - prv[0] * mult) * scale; \
prv[0] = dst[n]; \
} else { \
dst[n] = current + (current - prv[0]) * mult; \
prv[0] = current; \
} \
if (clip) { \
dst[n] = clip_fn(dst[n], -one, one); \
} \
} \
} \
} \
\
return 0; \
}
filters(flt, float, inverse, noclip, 1, 0, 1.f, av_clipf, 1)
filters(flt, float, inverse, clip, 1, 1, 1.f, av_clipf, 1)
filters(flt, float, noinverse, noclip, 0, 0, 1.f, av_clipf, 1)
filters(flt, float, noinverse, clip, 0, 1, 1.f, av_clipf, 1)
filters(fltp, float, inverse, noclip, 1, 0, 1.f, av_clipf, 0)
filters(fltp, float, inverse, clip, 1, 1, 1.f, av_clipf, 0)
filters(fltp, float, noinverse, noclip, 0, 0, 1.f, av_clipf, 0)
filters(fltp, float, noinverse, clip, 0, 1, 1.f, av_clipf, 0)
filters(dbl, double, inverse, noclip, 1, 0, 1.0, av_clipd, 1)
filters(dbl, double, inverse, clip, 1, 1, 1.0, av_clipd, 1)
filters(dbl, double, noinverse, noclip, 0, 0, 1.0, av_clipd, 1)
filters(dbl, double, noinverse, clip, 0, 1, 1.0, av_clipd, 1)
filters(dblp, double, inverse, noclip, 1, 0, 1.0, av_clipd, 0)
filters(dblp, double, inverse, clip, 1, 1, 1.0, av_clipd, 0)
filters(dblp, double, noinverse, noclip, 0, 0, 1.0, av_clipd, 0)
filters(dblp, double, noinverse, clip, 0, 1, 1.0, av_clipd, 0)
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
CrystalizerContext *s = ctx->priv;
switch (inlink->format) {
case AV_SAMPLE_FMT_FLT:
s->filter[0][0] = filter_inverse_flt_noclip;
s->filter[1][0] = filter_noinverse_flt_noclip;
s->filter[0][1] = filter_inverse_flt_clip;
s->filter[1][1] = filter_noinverse_flt_clip;
break;
case AV_SAMPLE_FMT_FLTP:
s->filter[0][0] = filter_inverse_fltp_noclip;
s->filter[1][0] = filter_noinverse_fltp_noclip;
s->filter[0][1] = filter_inverse_fltp_clip;
s->filter[1][1] = filter_noinverse_fltp_clip;
break;
case AV_SAMPLE_FMT_DBL:
s->filter[0][0] = filter_inverse_dbl_noclip;
s->filter[1][0] = filter_noinverse_dbl_noclip;
s->filter[0][1] = filter_inverse_dbl_clip;
s->filter[1][1] = filter_noinverse_dbl_clip;
break;
case AV_SAMPLE_FMT_DBLP:
s->filter[0][0] = filter_inverse_dblp_noclip;
s->filter[1][0] = filter_noinverse_dblp_noclip;
s->filter[0][1] = filter_inverse_dblp_clip;
s->filter[1][1] = filter_noinverse_dblp_clip;
break;
default:
return AVERROR_BUG;
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
CrystalizerContext *s = ctx->priv;
AVFrame *out;
ThreadData td;
if (!s->prev) {
s->prev = ff_get_audio_buffer(inlink, 1);
if (!s->prev) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
}
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);
}
td.d = (void **)out->extended_data;
td.s = (const void **)in->extended_data;
td.p = (void **)s->prev->extended_data;
td.nb_samples = in->nb_samples;
td.channels = in->ch_layout.nb_channels;
td.mult = ctx->is_disabled ? 0.f : s->mult;
ff_filter_execute(ctx, s->filter[td.mult >= 0.f][s->clip], &td, NULL,
FFMIN(inlink->ch_layout.nb_channels, ff_filter_get_nb_threads(ctx)));
if (out != in)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
CrystalizerContext *s = ctx->priv;
av_frame_free(&s->prev);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
const AVFilter ff_af_crystalizer = {
.name = "crystalizer",
.description = NULL_IF_CONFIG_SMALL("Simple audio noise sharpening filter."),
.priv_size = sizeof(CrystalizerContext),
.priv_class = &crystalizer_class,
.uninit = uninit,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(ff_audio_default_filterpad),
FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP),
.process_command = ff_filter_process_command,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
AVFILTER_FLAG_SLICE_THREADS,
};