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/*
* Copyright (c) 2021 Paul B Mahol
*
* 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/common.h"
#include "avfilter.h"
#include "filters.h"
#include "internal.h"
typedef struct AudioSDRContext {
int channels;
int64_t pts;
double *sum_u;
double *sum_uv;
AVFrame *cache[2];
} AudioSDRContext;
static int sdr(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
AudioSDRContext *s = ctx->priv;
AVFrame *u = s->cache[0];
AVFrame *v = s->cache[1];
const int channels = u->ch_layout.nb_channels;
const int start = (channels * jobnr) / nb_jobs;
const int end = (channels * (jobnr+1)) / nb_jobs;
const int nb_samples = u->nb_samples;
for (int ch = start; ch < end; ch++) {
const double *const us = (double *)u->extended_data[ch];
const double *const vs = (double *)v->extended_data[ch];
double sum_uv = 0.;
double sum_u = 0.;
for (int n = 0; n < nb_samples; n++) {
sum_u += us[n] * us[n];
sum_uv += (us[n] - vs[n]) * (us[n] - vs[n]);
}
s->sum_uv[ch] += sum_uv;
s->sum_u[ch] += sum_u;
}
return 0;
}
static int activate(AVFilterContext *ctx)
{
AudioSDRContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
int ret, status;
int available;
int64_t pts;
FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);
available = FFMIN(ff_inlink_queued_samples(ctx->inputs[0]), ff_inlink_queued_samples(ctx->inputs[1]));
if (available > 0) {
AVFrame *out;
for (int i = 0; i < 2; i++) {
ret = ff_inlink_consume_samples(ctx->inputs[i], available, available, &s->cache[i]);
if (ret > 0) {
if (s->pts == AV_NOPTS_VALUE)
s->pts = s->cache[i]->pts;
}
}
if (!ctx->is_disabled)
ff_filter_execute(ctx, sdr, NULL, NULL,
FFMIN(outlink->ch_layout.nb_channels, ff_filter_get_nb_threads(ctx)));
av_frame_free(&s->cache[1]);
out = s->cache[0];
out->nb_samples = available;
out->pts = av_rescale_q(s->pts, av_make_q(1, outlink->sample_rate), outlink->time_base);
out->duration = av_rescale_q(out->nb_samples, av_make_q(1, outlink->sample_rate), outlink->time_base);
s->pts += available;
s->cache[0] = NULL;
return ff_filter_frame(outlink, out);
}
for (int i = 0; i < 2; i++) {
if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
ff_outlink_set_status(outlink, status, s->pts);
return 0;
}
}
if (ff_outlink_frame_wanted(outlink)) {
for (int i = 0; i < 2; i++) {
if (ff_inlink_queued_samples(ctx->inputs[i]) > 0)
continue;
ff_inlink_request_frame(ctx->inputs[i]);
}
return 0;
}
return FFERROR_NOT_READY;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
AudioSDRContext *s = ctx->priv;
s->pts = AV_NOPTS_VALUE;
s->channels = inlink->ch_layout.nb_channels;
s->sum_u = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->sum_u));
s->sum_uv = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->sum_uv));
if (!s->sum_u || !s->sum_uv)
return AVERROR(ENOMEM);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
AudioSDRContext *s = ctx->priv;
for (int ch = 0; ch < s->channels; ch++)
av_log(ctx, AV_LOG_INFO, "SDR ch%d: %g dB\n", ch, 20. * log10(s->sum_u[ch] / s->sum_uv[ch]));
av_frame_free(&s->cache[0]);
av_frame_free(&s->cache[1]);
av_freep(&s->sum_u);
av_freep(&s->sum_uv);
}
static const AVFilterPad inputs[] = {
{
.name = "input0",
.type = AVMEDIA_TYPE_AUDIO,
},
{
.name = "input1",
.type = AVMEDIA_TYPE_AUDIO,
},
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_output,
},
};
const AVFilter ff_af_asdr = {
.name = "asdr",
.description = NULL_IF_CONFIG_SMALL("Measure Audio Signal-to-Distortion Ratio."),
.priv_size = sizeof(AudioSDRContext),
.activate = activate,
.uninit = uninit,
.flags = AVFILTER_FLAG_METADATA_ONLY |
AVFILTER_FLAG_SLICE_THREADS |
AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(outputs),
FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
};
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