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https://github.com/FFmpeg/FFmpeg.git
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b9c928a486
This flag allows distinguishing between filters that actually modify the data and those that only modify metadata or gather some stream information.
174 lines
4.7 KiB
C
174 lines
4.7 KiB
C
/*
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* Copyright (c) 2021 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "filters.h"
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#include "internal.h"
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typedef struct AudioSDRContext {
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int channels;
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int64_t pts;
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double *sum_u;
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double *sum_uv;
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AVFrame *cache[2];
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} AudioSDRContext;
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static void sdr(AVFilterContext *ctx, const AVFrame *u, const AVFrame *v)
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{
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AudioSDRContext *s = ctx->priv;
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for (int ch = 0; ch < u->channels; ch++) {
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const double *const us = (double *)u->extended_data[ch];
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const double *const vs = (double *)v->extended_data[ch];
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double sum_uv = s->sum_uv[ch];
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double sum_u = s->sum_u[ch];
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for (int n = 0; n < u->nb_samples; n++) {
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sum_u += us[n] * us[n];
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sum_uv += (us[n] - vs[n]) * (us[n] - vs[n]);
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}
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s->sum_uv[ch] = sum_uv;
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s->sum_u[ch] = sum_u;
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}
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}
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static int activate(AVFilterContext *ctx)
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{
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AudioSDRContext *s = ctx->priv;
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int ret, status;
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int available;
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int64_t pts;
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FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
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available = FFMIN(ff_inlink_queued_samples(ctx->inputs[0]), ff_inlink_queued_samples(ctx->inputs[1]));
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if (available > 0) {
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AVFrame *out;
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for (int i = 0; i < 2; i++) {
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ret = ff_inlink_consume_samples(ctx->inputs[i], available, available, &s->cache[i]);
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if (ret > 0) {
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if (s->pts == AV_NOPTS_VALUE)
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s->pts = s->cache[i]->pts;
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}
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}
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sdr(ctx, s->cache[0], s->cache[1]);
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av_frame_free(&s->cache[1]);
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out = s->cache[0];
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out->nb_samples = available;
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out->pts = s->pts;
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s->pts += available;
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s->cache[0] = NULL;
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return ff_filter_frame(ctx->outputs[0], out);
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}
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for (int i = 0; i < 2; i++) {
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if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
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ff_outlink_set_status(ctx->outputs[0], status, s->pts);
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return 0;
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}
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}
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if (ff_outlink_frame_wanted(ctx->outputs[0])) {
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for (int i = 0; i < 2; i++) {
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if (ff_inlink_queued_samples(ctx->inputs[i]) > 0)
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continue;
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ff_inlink_request_frame(ctx->inputs[i]);
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}
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return 0;
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}
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return FFERROR_NOT_READY;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *inlink = ctx->inputs[0];
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AudioSDRContext *s = ctx->priv;
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s->pts = AV_NOPTS_VALUE;
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s->channels = inlink->channels;
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s->sum_u = av_calloc(outlink->channels, sizeof(*s->sum_u));
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s->sum_uv = av_calloc(outlink->channels, sizeof(*s->sum_uv));
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if (!s->sum_u || !s->sum_uv)
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return AVERROR(ENOMEM);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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AudioSDRContext *s = ctx->priv;
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for (int ch = 0; ch < s->channels; ch++)
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av_log(ctx, AV_LOG_INFO, "SDR ch%d: %g dB\n", ch, 20. * log10(s->sum_u[ch] / s->sum_uv[ch]));
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av_frame_free(&s->cache[0]);
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av_frame_free(&s->cache[1]);
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av_freep(&s->sum_u);
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av_freep(&s->sum_uv);
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}
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static const AVFilterPad inputs[] = {
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{
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.name = "input0",
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.type = AVMEDIA_TYPE_AUDIO,
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},
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{
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.name = "input1",
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.type = AVMEDIA_TYPE_AUDIO,
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},
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};
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static const AVFilterPad outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_output,
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},
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};
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const AVFilter ff_af_asdr = {
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.name = "asdr",
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.description = NULL_IF_CONFIG_SMALL("Measure Audio Signal-to-Distortion Ratio."),
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.priv_size = sizeof(AudioSDRContext),
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.activate = activate,
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.uninit = uninit,
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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FILTER_INPUTS(inputs),
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FILTER_OUTPUTS(outputs),
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FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
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};
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