/*
* 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"
#include "formats.h"
typedef struct CrystalizerContext {
const AVClass *class;
float mult;
int clip;
AVFrame *prev;
void (*filter)(void **dst, void **prv, const void **src,
int nb_samples, int channels, float mult, int clip);
} CrystalizerContext;
#define OFFSET(x) offsetof(CrystalizerContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption crystalizer_options[] = {
{ "i", "set intensity", OFFSET(mult), AV_OPT_TYPE_FLOAT, {.dbl=2.0}, 0, 10, A },
{ "c", "enable clipping", OFFSET(clip), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, A },
{ NULL }
};
AVFILTER_DEFINE_CLASS(crystalizer);
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);
}
static void filter_flt(void **d, void **p, const void **s,
int nb_samples, int channels,
float mult, int clip)
{
const float *src = s[0];
float *dst = d[0];
float *prv = p[0];
int n, c;
for (n = 0; n < nb_samples; n++) {
for (c = 0; c < channels; c++) {
float current = src[c];
dst[c] = current + (current - prv[c]) * mult;
prv[c] = current;
if (clip) {
dst[c] = av_clipf(dst[c], -1, 1);
}
}
dst += c;
src += c;
}
}
static void filter_dbl(void **d, void **p, const void **s,
int nb_samples, int channels,
float mult, int clip)
{
const double *src = s[0];
double *dst = d[0];
double *prv = p[0];
int n, c;
for (n = 0; n < nb_samples; n++) {
for (c = 0; c < channels; c++) {
double current = src[c];
dst[c] = current + (current - prv[c]) * mult;
prv[c] = current;
if (clip) {
dst[c] = av_clipd(dst[c], -1, 1);
}
}
dst += c;
src += c;
}
}
static void filter_fltp(void **d, void **p, const void **s,
int nb_samples, int channels,
float mult, int clip)
{
int n, c;
for (c = 0; c < channels; c++) {
const float *src = s[c];
float *dst = d[c];
float *prv = p[c];
for (n = 0; n < nb_samples; n++) {
float current = src[n];
dst[n] = current + (current - prv[0]) * mult;
prv[0] = current;
if (clip) {
dst[n] = av_clipf(dst[n], -1, 1);
}
}
}
}
static void filter_dblp(void **d, void **p, const void **s,
int nb_samples, int channels,
float mult, int clip)
{
int n, c;
for (c = 0; c < channels; c++) {
const double *src = s[c];
double *dst = d[c];
double *prv = p[c];
for (n = 0; n < nb_samples; n++) {
double current = src[n];
dst[n] = current + (current - prv[0]) * mult;
prv[0] = current;
if (clip) {
dst[n] = av_clipd(dst[n], -1, 1);
}
}
}
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
CrystalizerContext *s = ctx->priv;
switch (inlink->format) {
case AV_SAMPLE_FMT_FLT: s->filter = filter_flt; break;
case AV_SAMPLE_FMT_DBL: s->filter = filter_dbl; break;
case AV_SAMPLE_FMT_FLTP: s->filter = filter_fltp; break;
case AV_SAMPLE_FMT_DBLP: s->filter = filter_dblp; break;
}
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;
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(inlink, in->nb_samples);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
}
s->filter((void **)out->extended_data, (void **)s->prev->extended_data, (const void **)in->extended_data,
in->nb_samples, in->channels, s->mult, s->clip);
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,
},
{ NULL }
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
{ NULL }
};
AVFilter ff_af_crystalizer = {
.name = "crystalizer",
.description = NULL_IF_CONFIG_SMALL("Simple expand audio dynamic range filter."),
.query_formats = query_formats,
.priv_size = sizeof(CrystalizerContext),
.priv_class = &crystalizer_class,
.uninit = uninit,
.inputs = inputs,
.outputs = outputs,
};